From: Jonathan Rajotte Date: Thu, 15 Oct 2015 20:47:34 +0000 (-0400) Subject: Move libconsumer under common/consumer/ X-Git-Tag: v2.8.0-rc1~254 X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=commitdiff_plain;h=c8fea79c745d42ea8143b7020ae11b4fc2da0d8a;hp=ea26306076d26c40ed31e4f9170dc2852bda502f Move libconsumer under common/consumer/ Signed-off-by: Jonathan Rajotte Signed-off-by: Jérémie Galarneau --- diff --git a/configure.ac b/configure.ac index eabcff2ae..ceaf37715 100644 --- a/configure.ac +++ b/configure.ac @@ -604,6 +604,7 @@ AC_CONFIG_FILES([ src/common/Makefile src/common/kernel-ctl/Makefile src/common/kernel-consumer/Makefile + src/common/consumer/Makefile src/common/ust-consumer/Makefile src/common/hashtable/Makefile src/common/sessiond-comm/Makefile diff --git a/src/bin/lttng-consumerd/Makefile.am b/src/bin/lttng-consumerd/Makefile.am index 28034ca34..7c6b0275e 100644 --- a/src/bin/lttng-consumerd/Makefile.am +++ b/src/bin/lttng-consumerd/Makefile.am @@ -8,7 +8,7 @@ lttng_consumerd_SOURCES = lttng-consumerd.c \ health-consumerd.c lttng_consumerd_LDADD = \ - $(top_builddir)/src/common/libconsumer.la \ + $(top_builddir)/src/common/consumer/libconsumer.la \ $(top_builddir)/src/common/sessiond-comm/libsessiond-comm.la \ $(top_builddir)/src/common/libcommon.la \ $(top_builddir)/src/common/index/libindex.la \ diff --git a/src/bin/lttng-consumerd/health-consumerd.c b/src/bin/lttng-consumerd/health-consumerd.c index 8d632ef95..2ea6303f7 100644 --- a/src/bin/lttng-consumerd/health-consumerd.c +++ b/src/bin/lttng-consumerd/health-consumerd.c @@ -42,8 +42,8 @@ #include #include -#include -#include +#include +#include #include #include #include diff --git a/src/bin/lttng-consumerd/lttng-consumerd.c b/src/bin/lttng-consumerd/lttng-consumerd.c index cd0fc73b2..87ffb05dd 100644 --- a/src/bin/lttng-consumerd/lttng-consumerd.c +++ b/src/bin/lttng-consumerd/lttng-consumerd.c @@ -42,8 +42,8 @@ #include #include -#include -#include +#include +#include #include #include #include diff --git a/src/bin/lttng-relayd/health-relayd.c b/src/bin/lttng-relayd/health-relayd.c index 8452c1a6c..c6dd2e852 100644 --- a/src/bin/lttng-relayd/health-relayd.c +++ b/src/bin/lttng-relayd/health-relayd.c @@ -42,8 +42,8 @@ #include #include -#include -#include +#include +#include #include #include #include diff --git a/src/bin/lttng-sessiond/consumer.h b/src/bin/lttng-sessiond/consumer.h index 73f113d0a..47e59c7c2 100644 --- a/src/bin/lttng-sessiond/consumer.h +++ b/src/bin/lttng-sessiond/consumer.h @@ -18,7 +18,7 @@ #ifndef _CONSUMER_H #define _CONSUMER_H -#include +#include #include #include #include diff --git a/src/bin/lttng-sessiond/ust-consumer.c b/src/bin/lttng-sessiond/ust-consumer.c index abb9e103d..3bb54f039 100644 --- a/src/bin/lttng-sessiond/ust-consumer.c +++ b/src/bin/lttng-sessiond/ust-consumer.c @@ -24,7 +24,7 @@ #include #include -#include +#include #include #include "consumer.h" diff --git a/src/common/Makefile.am b/src/common/Makefile.am index 5b716129c..0b16e4be9 100644 --- a/src/common/Makefile.am +++ b/src/common/Makefile.am @@ -3,14 +3,14 @@ AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src AUTOMAKE_OPTIONS = subdir-objects SUBDIRS = compat health hashtable kernel-ctl sessiond-comm relayd \ - kernel-consumer ust-consumer testpoint index config + kernel-consumer ust-consumer testpoint index config \ + consumer AM_CFLAGS = -fno-strict-aliasing noinst_HEADERS = lttng-kernel.h defaults.h macros.h error.h futex.h \ uri.h utils.h lttng-kernel-old.h \ - consumer-metadata-cache.h consumer-timer.h \ - consumer-testpoint.h align.h bitfield.h bug.h + align.h bitfield.h bug.h # Common library noinst_LTLIBRARIES = libcommon.la @@ -28,24 +28,6 @@ libcommon_la_LIBADD = \ -lrt \ $(top_builddir)/src/common/config/libconfig.la -# Consumer library -noinst_LTLIBRARIES += libconsumer.la - -libconsumer_la_SOURCES = consumer.c consumer.h consumer-metadata-cache.c \ - consumer-timer.c consumer-stream.c consumer-stream.h - -libconsumer_la_LIBADD = \ - $(top_builddir)/src/common/sessiond-comm/libsessiond-comm.la \ - $(top_builddir)/src/common/kernel-consumer/libkernel-consumer.la \ - $(top_builddir)/src/common/hashtable/libhashtable.la \ - $(top_builddir)/src/common/compat/libcompat.la \ - $(top_builddir)/src/common/relayd/librelayd.la - -if HAVE_LIBLTTNG_UST_CTL -libconsumer_la_LIBADD += \ - $(top_builddir)/src/common/ust-consumer/libust-consumer.la -endif - all-local: @if [ x"$(srcdir)" != x"$(builddir)" ]; then \ for script in $(EXTRA_DIST); do \ diff --git a/src/common/consumer-metadata-cache.c b/src/common/consumer-metadata-cache.c deleted file mode 100644 index cbd3ef394..000000000 --- a/src/common/consumer-metadata-cache.c +++ /dev/null @@ -1,238 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include - -#include "consumer-metadata-cache.h" - -extern struct lttng_consumer_global_data consumer_data; - -/* - * Extend the allocated size of the metadata cache. Called only from - * lttng_ustconsumer_write_metadata_cache. - * - * Return 0 on success, a negative value on error. - */ -static int extend_metadata_cache(struct lttng_consumer_channel *channel, - unsigned int size) -{ - int ret = 0; - char *tmp_data_ptr; - unsigned int new_size, old_size; - - assert(channel); - assert(channel->metadata_cache); - - old_size = channel->metadata_cache->cache_alloc_size; - new_size = max_t(unsigned int, old_size + size, old_size << 1); - DBG("Extending metadata cache to %u", new_size); - tmp_data_ptr = realloc(channel->metadata_cache->data, new_size); - if (!tmp_data_ptr) { - ERR("Reallocating metadata cache"); - free(channel->metadata_cache->data); - ret = -1; - goto end; - } - /* Zero newly allocated memory */ - memset(tmp_data_ptr + old_size, 0, new_size - old_size); - channel->metadata_cache->data = tmp_data_ptr; - channel->metadata_cache->cache_alloc_size = new_size; - -end: - return ret; -} - -/* - * Write metadata to the cache, extend the cache if necessary. We support - * overlapping updates, but they need to be contiguous. Send the - * contiguous metadata in cache to the ring buffer. The metadata cache - * lock MUST be acquired to write in the cache. - * - * Return 0 on success, a negative value on error. - */ -int consumer_metadata_cache_write(struct lttng_consumer_channel *channel, - unsigned int offset, unsigned int len, char *data) -{ - int ret = 0; - int size_ret; - struct consumer_metadata_cache *cache; - - assert(channel); - assert(channel->metadata_cache); - - cache = channel->metadata_cache; - DBG("Writing %u bytes from offset %u in metadata cache", len, offset); - - if (offset + len > cache->cache_alloc_size) { - ret = extend_metadata_cache(channel, - len - cache->cache_alloc_size + offset); - if (ret < 0) { - ERR("Extending metadata cache"); - goto end; - } - } - - memcpy(cache->data + offset, data, len); - if (offset + len > cache->max_offset) { - char dummy = 'c'; - - cache->max_offset = offset + len; - if (channel->monitor) { - size_ret = lttng_write(channel->metadata_stream->ust_metadata_poll_pipe[1], - &dummy, 1); - if (size_ret < 1) { - ERR("Wakeup UST metadata pipe"); - ret = -1; - goto end; - } - } - } - -end: - return ret; -} - -/* - * Create the metadata cache, original allocated size: max_sb_size - * - * Return 0 on success, a negative value on error. - */ -int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel) -{ - int ret; - - assert(channel); - - channel->metadata_cache = zmalloc( - sizeof(struct consumer_metadata_cache)); - if (!channel->metadata_cache) { - PERROR("zmalloc metadata cache struct"); - ret = -1; - goto end; - } - ret = pthread_mutex_init(&channel->metadata_cache->lock, NULL); - if (ret != 0) { - PERROR("mutex init"); - goto end_free_cache; - } - - channel->metadata_cache->cache_alloc_size = DEFAULT_METADATA_CACHE_SIZE; - channel->metadata_cache->data = zmalloc( - channel->metadata_cache->cache_alloc_size * sizeof(char)); - if (!channel->metadata_cache->data) { - PERROR("zmalloc metadata cache data"); - ret = -1; - goto end_free_mutex; - } - DBG("Allocated metadata cache of %" PRIu64 " bytes", - channel->metadata_cache->cache_alloc_size); - - ret = 0; - goto end; - -end_free_mutex: - pthread_mutex_destroy(&channel->metadata_cache->lock); -end_free_cache: - free(channel->metadata_cache); -end: - return ret; -} - -/* - * Destroy and free the metadata cache - */ -void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel) -{ - if (!channel || !channel->metadata_cache) { - return; - } - - DBG("Destroying metadata cache"); - - pthread_mutex_destroy(&channel->metadata_cache->lock); - free(channel->metadata_cache->data); - free(channel->metadata_cache); -} - -/* - * Check if the cache is flushed up to the offset passed in parameter. - * - * Return 0 if everything has been flushed, 1 if there is data not flushed. - */ -int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, - uint64_t offset, int timer) -{ - int ret = 0; - struct lttng_consumer_stream *metadata_stream; - - assert(channel); - assert(channel->metadata_cache); - - /* - * If not called from a timer handler, we have to take the - * channel lock to be mutually exclusive with channel teardown. - * Timer handler does not need to take this lock because it is - * already synchronized by timer stop (and, more importantly, - * taking this lock in a timer handler would cause a deadlock). - */ - if (!timer) { - pthread_mutex_lock(&channel->lock); - } - pthread_mutex_lock(&channel->timer_lock); - pthread_mutex_lock(&channel->metadata_cache->lock); - - metadata_stream = channel->metadata_stream; - - if (!metadata_stream) { - /* - * Having no metadata stream means the channel is being destroyed so there - * is no cache to flush anymore. - */ - ret = 0; - } else if (metadata_stream->ust_metadata_pushed >= offset) { - ret = 0; - } else if (channel->metadata_stream->endpoint_status != - CONSUMER_ENDPOINT_ACTIVE) { - /* An inactive endpoint means we don't have to flush anymore. */ - ret = 0; - } else { - /* Still not completely flushed. */ - ret = 1; - } - - pthread_mutex_unlock(&channel->metadata_cache->lock); - pthread_mutex_unlock(&channel->timer_lock); - if (!timer) { - pthread_mutex_unlock(&channel->lock); - } - - return ret; -} diff --git a/src/common/consumer-metadata-cache.h b/src/common/consumer-metadata-cache.h deleted file mode 100644 index e7aba4ac9..000000000 --- a/src/common/consumer-metadata-cache.h +++ /dev/null @@ -1,51 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#ifndef CONSUMER_METADATA_CACHE_H -#define CONSUMER_METADATA_CACHE_H - -#include - -struct consumer_metadata_cache { - char *data; - uint64_t cache_alloc_size; - /* - * The upper-limit of data written inside the buffer. - * - * With the total_bytes_written it allows us to keep track of when the - * cache contains contiguous metadata ready to be sent to the RB. - * All cached data is contiguous. - */ - uint64_t max_offset; - /* - * Lock to update the metadata cache and push into the ring_buffer - * (ustctl_write_metadata_to_channel). - * - * This is nested INSIDE the consumer_data lock. - */ - pthread_mutex_t lock; -}; - -int consumer_metadata_cache_write(struct lttng_consumer_channel *channel, - unsigned int offset, unsigned int len, char *data); -int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel); -void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel); -int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, - uint64_t offset, int timer); - -#endif /* CONSUMER_METADATA_CACHE_H */ diff --git a/src/common/consumer-stream.c b/src/common/consumer-stream.c deleted file mode 100644 index a62cef272..000000000 --- a/src/common/consumer-stream.c +++ /dev/null @@ -1,554 +0,0 @@ -/* - * Copyright (C) 2011 - Julien Desfossez - * Mathieu Desnoyers - * Copyright (C) 2013 - David Goulet - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#include "consumer-stream.h" - -/* - * RCU call to free stream. MUST only be used with call_rcu(). - */ -static void free_stream_rcu(struct rcu_head *head) -{ - struct lttng_ht_node_u64 *node = - caa_container_of(head, struct lttng_ht_node_u64, head); - struct lttng_consumer_stream *stream = - caa_container_of(node, struct lttng_consumer_stream, node); - - pthread_mutex_destroy(&stream->lock); - free(stream); -} - -/* - * Close stream on the relayd side. This call can destroy a relayd if the - * conditions are met. - * - * A RCU read side lock MUST be acquired if the relayd object was looked up in - * a hash table before calling this. - */ -void consumer_stream_relayd_close(struct lttng_consumer_stream *stream, - struct consumer_relayd_sock_pair *relayd) -{ - int ret; - - assert(stream); - assert(relayd); - - if (stream->sent_to_relayd) { - uatomic_dec(&relayd->refcount); - assert(uatomic_read(&relayd->refcount) >= 0); - } - - /* Closing streams requires to lock the control socket. */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_send_close_stream(&relayd->control_sock, - stream->relayd_stream_id, - stream->next_net_seq_num - 1); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret < 0) { - DBG("Unable to close stream on the relayd. Continuing"); - /* - * Continue here. There is nothing we can do for the relayd. - * Chances are that the relayd has closed the socket so we just - * continue cleaning up. - */ - } - - /* Both conditions are met, we destroy the relayd. */ - if (uatomic_read(&relayd->refcount) == 0 && - uatomic_read(&relayd->destroy_flag)) { - consumer_destroy_relayd(relayd); - } - stream->net_seq_idx = (uint64_t) -1ULL; - stream->sent_to_relayd = 0; -} - -/* - * Close stream's file descriptors and, if needed, close stream also on the - * relayd side. - * - * The consumer data lock MUST be acquired. - * The stream lock MUST be acquired. - */ -void consumer_stream_close(struct lttng_consumer_stream *stream) -{ - int ret; - struct consumer_relayd_sock_pair *relayd; - - assert(stream); - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - if (stream->mmap_base != NULL) { - ret = munmap(stream->mmap_base, stream->mmap_len); - if (ret != 0) { - PERROR("munmap"); - } - } - - if (stream->wait_fd >= 0) { - ret = close(stream->wait_fd); - if (ret) { - PERROR("close"); - } - stream->wait_fd = -1; - } - if (stream->chan->output == CONSUMER_CHANNEL_SPLICE) { - utils_close_pipe(stream->splice_pipe); - } - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - { - /* - * Special case for the metadata since the wait fd is an internal pipe - * polled in the metadata thread. - */ - if (stream->metadata_flag && stream->chan->monitor) { - int rpipe = stream->ust_metadata_poll_pipe[0]; - - /* - * This will stop the channel timer if one and close the write side - * of the metadata poll pipe. - */ - lttng_ustconsumer_close_metadata(stream->chan); - if (rpipe >= 0) { - ret = close(rpipe); - if (ret < 0) { - PERROR("closing metadata pipe read side"); - } - stream->ust_metadata_poll_pipe[0] = -1; - } - } - break; - } - default: - ERR("Unknown consumer_data type"); - assert(0); - } - - /* Close output fd. Could be a socket or local file at this point. */ - if (stream->out_fd >= 0) { - ret = close(stream->out_fd); - if (ret) { - PERROR("close"); - } - stream->out_fd = -1; - } - - if (stream->index_fd >= 0) { - ret = close(stream->index_fd); - if (ret) { - PERROR("close stream index_fd"); - } - stream->index_fd = -1; - } - - /* Check and cleanup relayd if needed. */ - rcu_read_lock(); - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd != NULL) { - consumer_stream_relayd_close(stream, relayd); - } - rcu_read_unlock(); -} - -/* - * Delete the stream from all possible hash tables. - * - * The consumer data lock MUST be acquired. - * The stream lock MUST be acquired. - */ -void consumer_stream_delete(struct lttng_consumer_stream *stream, - struct lttng_ht *ht) -{ - int ret; - struct lttng_ht_iter iter; - - assert(stream); - /* Should NEVER be called not in monitor mode. */ - assert(stream->chan->monitor); - - rcu_read_lock(); - - if (ht) { - iter.iter.node = &stream->node.node; - ret = lttng_ht_del(ht, &iter); - assert(!ret); - } - - /* Delete from stream per channel ID hash table. */ - iter.iter.node = &stream->node_channel_id.node; - /* - * The returned value is of no importance. Even if the node is NOT in the - * hash table, we continue since we may have been called by a code path - * that did not add the stream to a (all) hash table. Same goes for the - * next call ht del call. - */ - (void) lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); - - /* Delete from the global stream list. */ - iter.iter.node = &stream->node_session_id.node; - /* See the previous ht del on why we ignore the returned value. */ - (void) lttng_ht_del(consumer_data.stream_list_ht, &iter); - - rcu_read_unlock(); - - if (!stream->metadata_flag) { - /* Decrement the stream count of the global consumer data. */ - assert(consumer_data.stream_count > 0); - consumer_data.stream_count--; - } -} - -/* - * Free the given stream within a RCU call. - */ -void consumer_stream_free(struct lttng_consumer_stream *stream) -{ - assert(stream); - - call_rcu(&stream->node.head, free_stream_rcu); -} - -/* - * Destroy the stream's buffers of the tracer. - */ -void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream) -{ - assert(stream); - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - lttng_ustconsumer_del_stream(stream); - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - } -} - -/* - * Destroy and close a already created stream. - */ -static void destroy_close_stream(struct lttng_consumer_stream *stream) -{ - assert(stream); - - DBG("Consumer stream destroy monitored key: %" PRIu64, stream->key); - - /* Destroy tracer buffers of the stream. */ - consumer_stream_destroy_buffers(stream); - /* Close down everything including the relayd if one. */ - consumer_stream_close(stream); -} - -/* - * Decrement the stream's channel refcount and if down to 0, return the channel - * pointer so it can be destroyed by the caller or NULL if not. - */ -static struct lttng_consumer_channel *unref_channel( - struct lttng_consumer_stream *stream) -{ - struct lttng_consumer_channel *free_chan = NULL; - - assert(stream); - assert(stream->chan); - - /* Update refcount of channel and see if we need to destroy it. */ - if (!uatomic_sub_return(&stream->chan->refcount, 1) - && !uatomic_read(&stream->chan->nb_init_stream_left)) { - free_chan = stream->chan; - } - - return free_chan; -} - -/* - * Destroy a stream completely. This will delete, close and free the stream. - * Once return, the stream is NO longer usable. Its channel may get destroyed - * if conditions are met for a monitored stream. - * - * This MUST be called WITHOUT the consumer data and stream lock acquired if - * the stream is in _monitor_ mode else it does not matter. - */ -void consumer_stream_destroy(struct lttng_consumer_stream *stream, - struct lttng_ht *ht) -{ - assert(stream); - - /* Stream is in monitor mode. */ - if (stream->monitor) { - struct lttng_consumer_channel *free_chan = NULL; - - /* - * This means that the stream was successfully removed from the streams - * list of the channel and sent to the right thread managing this - * stream thus being globally visible. - */ - if (stream->globally_visible) { - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&stream->chan->lock); - pthread_mutex_lock(&stream->lock); - /* Remove every reference of the stream in the consumer. */ - consumer_stream_delete(stream, ht); - - destroy_close_stream(stream); - - /* Update channel's refcount of the stream. */ - free_chan = unref_channel(stream); - - /* Indicates that the consumer data state MUST be updated after this. */ - consumer_data.need_update = 1; - - pthread_mutex_unlock(&stream->lock); - pthread_mutex_unlock(&stream->chan->lock); - pthread_mutex_unlock(&consumer_data.lock); - } else { - /* - * If the stream is not visible globally, this needs to be done - * outside of the consumer data lock section. - */ - free_chan = unref_channel(stream); - } - - if (free_chan) { - consumer_del_channel(free_chan); - } - } else { - destroy_close_stream(stream); - } - - /* Free stream within a RCU call. */ - consumer_stream_free(stream); -} - -/* - * Write index of a specific stream either on the relayd or local disk. - * - * Return 0 on success or else a negative value. - */ -int consumer_stream_write_index(struct lttng_consumer_stream *stream, - struct ctf_packet_index *index) -{ - int ret; - struct consumer_relayd_sock_pair *relayd; - - assert(stream); - assert(index); - - rcu_read_lock(); - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd) { - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_send_index(&relayd->control_sock, index, - stream->relayd_stream_id, stream->next_net_seq_num - 1); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - } else { - ssize_t size_ret; - - size_ret = index_write(stream->index_fd, index, - sizeof(struct ctf_packet_index)); - if (size_ret < sizeof(struct ctf_packet_index)) { - ret = -1; - } else { - ret = 0; - } - } - if (ret < 0) { - goto error; - } - -error: - rcu_read_unlock(); - return ret; -} - -/* - * Actually do the metadata sync using the given metadata stream. - * - * Return 0 on success else a negative value. ENODATA can be returned also - * indicating that there is no metadata available for that stream. - */ -static int do_sync_metadata(struct lttng_consumer_stream *metadata, - struct lttng_consumer_local_data *ctx) -{ - int ret; - - assert(metadata); - assert(metadata->metadata_flag); - assert(ctx); - - /* - * In UST, since we have to write the metadata from the cache packet - * by packet, we might need to start this procedure multiple times - * until all the metadata from the cache has been extracted. - */ - do { - /* - * Steps : - * - Lock the metadata stream - * - Check if metadata stream node was deleted before locking. - * - if yes, release and return success - * - Check if new metadata is ready (flush + snapshot pos) - * - If nothing : release and return. - * - Lock the metadata_rdv_lock - * - Unlock the metadata stream - * - cond_wait on metadata_rdv to wait the wakeup from the - * metadata thread - * - Unlock the metadata_rdv_lock - */ - pthread_mutex_lock(&metadata->lock); - - /* - * There is a possibility that we were able to acquire a reference on the - * stream from the RCU hash table but between then and now, the node might - * have been deleted just before the lock is acquired. Thus, after locking, - * we make sure the metadata node has not been deleted which means that the - * buffers are closed. - * - * In that case, there is no need to sync the metadata hence returning a - * success return code. - */ - ret = cds_lfht_is_node_deleted(&metadata->node.node); - if (ret) { - ret = 0; - goto end_unlock_mutex; - } - - switch (ctx->type) { - case LTTNG_CONSUMER_KERNEL: - /* - * Empty the metadata cache and flush the current stream. - */ - ret = lttng_kconsumer_sync_metadata(metadata); - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - /* - * Ask the sessiond if we have new metadata waiting and update the - * consumer metadata cache. - */ - ret = lttng_ustconsumer_sync_metadata(ctx, metadata); - break; - default: - assert(0); - ret = -1; - break; - } - /* - * Error or no new metadata, we exit here. - */ - if (ret <= 0 || ret == ENODATA) { - goto end_unlock_mutex; - } - - /* - * At this point, new metadata have been flushed, so we wait on the - * rendez-vous point for the metadata thread to wake us up when it - * finishes consuming the metadata and continue execution. - */ - - pthread_mutex_lock(&metadata->metadata_rdv_lock); - - /* - * Release metadata stream lock so the metadata thread can process it. - */ - pthread_mutex_unlock(&metadata->lock); - - /* - * Wait on the rendez-vous point. Once woken up, it means the metadata was - * consumed and thus synchronization is achieved. - */ - pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock); - pthread_mutex_unlock(&metadata->metadata_rdv_lock); - } while (ret == EAGAIN); - - /* Success */ - return 0; - -end_unlock_mutex: - pthread_mutex_unlock(&metadata->lock); - return ret; -} - -/* - * Synchronize the metadata using a given session ID. A successful acquisition - * of a metadata stream will trigger a request to the session daemon and a - * snapshot so the metadata thread can consume it. - * - * This function call is a rendez-vous point between the metadata thread and - * the data thread. - * - * Return 0 on success or else a negative value. - */ -int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, - uint64_t session_id) -{ - int ret; - struct lttng_consumer_stream *stream = NULL; - struct lttng_ht_iter iter; - struct lttng_ht *ht; - - assert(ctx); - - /* Ease our life a bit. */ - ht = consumer_data.stream_list_ht; - - rcu_read_lock(); - - /* Search the metadata associated with the session id of the given stream. */ - - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct, - &session_id, &iter.iter, stream, node_session_id.node) { - if (!stream->metadata_flag) { - continue; - } - - ret = do_sync_metadata(stream, ctx); - if (ret < 0) { - goto end; - } - } - - /* - * Force return code to 0 (success) since ret might be ENODATA for instance - * which is not an error but rather that we should come back. - */ - ret = 0; - -end: - rcu_read_unlock(); - return ret; -} diff --git a/src/common/consumer-stream.h b/src/common/consumer-stream.h deleted file mode 100644 index c5fb09732..000000000 --- a/src/common/consumer-stream.h +++ /dev/null @@ -1,80 +0,0 @@ -/* - * Copyright (C) 2013 - David Goulet - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#ifndef LTTNG_CONSUMER_STREAM_H -#define LTTNG_CONSUMER_STREAM_H - -#include "consumer.h" - -/* - * Close stream's file descriptors and, if needed, close stream also on the - * relayd side. - * - * The stream lock MUST be acquired. - * The consumer data lock MUST be acquired. - */ -void consumer_stream_close(struct lttng_consumer_stream *stream); - -/* - * Close stream on the relayd side. This call can destroy a relayd if the - * conditions are met. - * - * A RCU read side lock MUST be acquired if the relayd object was looked up in - * a hash table before calling this. - */ -void consumer_stream_relayd_close(struct lttng_consumer_stream *stream, - struct consumer_relayd_sock_pair *relayd); - -/* - * Delete the stream from all possible hash tables. - * - * The consumer data lock MUST be acquired. - */ -void consumer_stream_delete(struct lttng_consumer_stream *stream, - struct lttng_ht *ht); - -/* - * Free the given stream within a RCU call. - */ -void consumer_stream_free(struct lttng_consumer_stream *stream); - -/* - * Destroy a stream completely. This will delete, close and free the stream. - * Once return, the stream is NO longer usable. Its channel may get destroyed - * if conditions are met. - * - * This MUST be called WITHOUT the consumer data and stream lock acquired. - */ -void consumer_stream_destroy(struct lttng_consumer_stream *stream, - struct lttng_ht *ht); - -/* - * Destroy the stream's buffers on the tracer side. This is also called in a - * stream destroy. - */ -void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream); - -/* - * Write index of a specific stream either on the relayd or local disk. - */ -int consumer_stream_write_index(struct lttng_consumer_stream *stream, - struct ctf_packet_index *index); - -int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, - uint64_t session_id); - -#endif /* LTTNG_CONSUMER_STREAM_H */ diff --git a/src/common/consumer-testpoint.h b/src/common/consumer-testpoint.h deleted file mode 100644 index e94ce57a2..000000000 --- a/src/common/consumer-testpoint.h +++ /dev/null @@ -1,31 +0,0 @@ -#ifndef CONSUMERD_TESTPOINT_H -#define CONSUMERD_TESTPOINT_H - -/* - * Copyright (C) 2012 - Christian Babeux - * Copyright (C) 2014 - Mathieu Desnoyers - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include - -/* Testpoints, internal use only */ -TESTPOINT_DECL(consumerd_thread_channel); -TESTPOINT_DECL(consumerd_thread_metadata); -TESTPOINT_DECL(consumerd_thread_data); -TESTPOINT_DECL(consumerd_thread_sessiond); -TESTPOINT_DECL(consumerd_thread_metadata_timer); - -#endif /* CONSUMERD_TESTPOINT_H */ diff --git a/src/common/consumer-timer.c b/src/common/consumer-timer.c deleted file mode 100644 index 5764b1333..000000000 --- a/src/common/consumer-timer.c +++ /dev/null @@ -1,607 +0,0 @@ -/* - * Copyright (C) 2012 - Julien Desfossez - * David Goulet - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License, version 2 only, as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 51 - * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _LGPL_SOURCE -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#include "consumer-timer.h" -#include "consumer-testpoint.h" -#include "ust-consumer/ust-consumer.h" - -static struct timer_signal_data timer_signal = { - .tid = 0, - .setup_done = 0, - .qs_done = 0, - .lock = PTHREAD_MUTEX_INITIALIZER, -}; - -/* - * Set custom signal mask to current thread. - */ -static void setmask(sigset_t *mask) -{ - int ret; - - ret = sigemptyset(mask); - if (ret) { - PERROR("sigemptyset"); - } - ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); - if (ret) { - PERROR("sigaddset switch"); - } - ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); - if (ret) { - PERROR("sigaddset teardown"); - } - ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); - if (ret) { - PERROR("sigaddset live"); - } -} - -/* - * Execute action on a timer switch. - * - * Beware: metadata_switch_timer() should *never* take a mutex also held - * while consumer_timer_switch_stop() is called. It would result in - * deadlocks. - */ -static void metadata_switch_timer(struct lttng_consumer_local_data *ctx, - int sig, siginfo_t *si, void *uc) -{ - int ret; - struct lttng_consumer_channel *channel; - - channel = si->si_value.sival_ptr; - assert(channel); - - if (channel->switch_timer_error) { - return; - } - - DBG("Switch timer for channel %" PRIu64, channel->key); - switch (ctx->type) { - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - /* - * Locks taken by lttng_ustconsumer_request_metadata(): - * - metadata_socket_lock - * - Calling lttng_ustconsumer_recv_metadata(): - * - channel->metadata_cache->lock - * - Calling consumer_metadata_cache_flushed(): - * - channel->timer_lock - * - channel->metadata_cache->lock - * - * Ensure that neither consumer_data.lock nor - * channel->lock are taken within this function, since - * they are held while consumer_timer_switch_stop() is - * called. - */ - ret = lttng_ustconsumer_request_metadata(ctx, channel, 1, 1); - if (ret < 0) { - channel->switch_timer_error = 1; - } - break; - case LTTNG_CONSUMER_KERNEL: - case LTTNG_CONSUMER_UNKNOWN: - assert(0); - break; - } -} - -static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts, - uint64_t stream_id) -{ - int ret; - struct ctf_packet_index index; - - memset(&index, 0, sizeof(index)); - index.stream_id = htobe64(stream_id); - index.timestamp_end = htobe64(ts); - ret = consumer_stream_write_index(stream, &index); - if (ret < 0) { - goto error; - } - -error: - return ret; -} - -int consumer_flush_kernel_index(struct lttng_consumer_stream *stream) -{ - uint64_t ts, stream_id; - int ret; - - ret = kernctl_get_current_timestamp(stream->wait_fd, &ts); - if (ret < 0) { - ERR("Failed to get the current timestamp"); - goto end; - } - ret = kernctl_buffer_flush(stream->wait_fd); - if (ret < 0) { - ERR("Failed to flush kernel stream"); - goto end; - } - ret = kernctl_snapshot(stream->wait_fd); - if (ret < 0) { - if (errno != EAGAIN && errno != ENODATA) { - PERROR("live timer kernel snapshot"); - ret = -1; - goto end; - } - ret = kernctl_get_stream_id(stream->wait_fd, &stream_id); - if (ret < 0) { - PERROR("kernctl_get_stream_id"); - goto end; - } - DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); - ret = send_empty_index(stream, ts, stream_id); - if (ret < 0) { - goto end; - } - } - ret = 0; -end: - return ret; -} - -static int check_kernel_stream(struct lttng_consumer_stream *stream) -{ - int ret; - - /* - * While holding the stream mutex, try to take a snapshot, if it - * succeeds, it means that data is ready to be sent, just let the data - * thread handle that. Otherwise, if the snapshot returns EAGAIN, it - * means that there is no data to read after the flush, so we can - * safely send the empty index. - * - * Doing a trylock and checking if waiting on metadata if - * trylock fails. Bail out of the stream is indeed waiting for - * metadata to be pushed. Busy wait on trylock otherwise. - */ - for (;;) { - ret = pthread_mutex_trylock(&stream->lock); - switch (ret) { - case 0: - break; /* We have the lock. */ - case EBUSY: - pthread_mutex_lock(&stream->metadata_timer_lock); - if (stream->waiting_on_metadata) { - ret = 0; - stream->missed_metadata_flush = true; - pthread_mutex_unlock(&stream->metadata_timer_lock); - goto end; /* Bail out. */ - } - pthread_mutex_unlock(&stream->metadata_timer_lock); - /* Try again. */ - caa_cpu_relax(); - continue; - default: - ERR("Unexpected pthread_mutex_trylock error %d", ret); - ret = -1; - goto end; - } - break; - } - ret = consumer_flush_kernel_index(stream); - pthread_mutex_unlock(&stream->lock); -end: - return ret; -} - -int consumer_flush_ust_index(struct lttng_consumer_stream *stream) -{ - uint64_t ts, stream_id; - int ret; - - ret = cds_lfht_is_node_deleted(&stream->node.node); - if (ret) { - goto end; - } - - ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); - if (ret < 0) { - ERR("Failed to get the current timestamp"); - goto end; - } - lttng_ustconsumer_flush_buffer(stream, 1); - ret = lttng_ustconsumer_take_snapshot(stream); - if (ret < 0) { - if (ret != -EAGAIN) { - ERR("Taking UST snapshot"); - ret = -1; - goto end; - } - ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); - if (ret < 0) { - PERROR("ustctl_get_stream_id"); - goto end; - } - DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); - ret = send_empty_index(stream, ts, stream_id); - if (ret < 0) { - goto end; - } - } - ret = 0; -end: - return ret; -} - -static int check_ust_stream(struct lttng_consumer_stream *stream) -{ - int ret; - - assert(stream); - assert(stream->ustream); - /* - * While holding the stream mutex, try to take a snapshot, if it - * succeeds, it means that data is ready to be sent, just let the data - * thread handle that. Otherwise, if the snapshot returns EAGAIN, it - * means that there is no data to read after the flush, so we can - * safely send the empty index. - * - * Doing a trylock and checking if waiting on metadata if - * trylock fails. Bail out of the stream is indeed waiting for - * metadata to be pushed. Busy wait on trylock otherwise. - */ - for (;;) { - ret = pthread_mutex_trylock(&stream->lock); - switch (ret) { - case 0: - break; /* We have the lock. */ - case EBUSY: - pthread_mutex_lock(&stream->metadata_timer_lock); - if (stream->waiting_on_metadata) { - ret = 0; - stream->missed_metadata_flush = true; - pthread_mutex_unlock(&stream->metadata_timer_lock); - goto end; /* Bail out. */ - } - pthread_mutex_unlock(&stream->metadata_timer_lock); - /* Try again. */ - caa_cpu_relax(); - continue; - default: - ERR("Unexpected pthread_mutex_trylock error %d", ret); - ret = -1; - goto end; - } - break; - } - ret = consumer_flush_ust_index(stream); - pthread_mutex_unlock(&stream->lock); -end: - return ret; -} - -/* - * Execute action on a live timer - */ -static void live_timer(struct lttng_consumer_local_data *ctx, - int sig, siginfo_t *si, void *uc) -{ - int ret; - struct lttng_consumer_channel *channel; - struct lttng_consumer_stream *stream; - struct lttng_ht *ht; - struct lttng_ht_iter iter; - - channel = si->si_value.sival_ptr; - assert(channel); - - if (channel->switch_timer_error) { - goto error; - } - ht = consumer_data.stream_per_chan_id_ht; - - DBG("Live timer for channel %" PRIu64, channel->key); - - rcu_read_lock(); - switch (ctx->type) { - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&channel->key, lttng_ht_seed), - ht->match_fct, &channel->key, &iter.iter, - stream, node_channel_id.node) { - ret = check_ust_stream(stream); - if (ret < 0) { - goto error_unlock; - } - } - break; - case LTTNG_CONSUMER_KERNEL: - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&channel->key, lttng_ht_seed), - ht->match_fct, &channel->key, &iter.iter, - stream, node_channel_id.node) { - ret = check_kernel_stream(stream); - if (ret < 0) { - goto error_unlock; - } - } - break; - case LTTNG_CONSUMER_UNKNOWN: - assert(0); - break; - } - -error_unlock: - rcu_read_unlock(); - -error: - return; -} - -static -void consumer_timer_signal_thread_qs(unsigned int signr) -{ - sigset_t pending_set; - int ret; - - /* - * We need to be the only thread interacting with the thread - * that manages signals for teardown synchronization. - */ - pthread_mutex_lock(&timer_signal.lock); - - /* Ensure we don't have any signal queued for this channel. */ - for (;;) { - ret = sigemptyset(&pending_set); - if (ret == -1) { - PERROR("sigemptyset"); - } - ret = sigpending(&pending_set); - if (ret == -1) { - PERROR("sigpending"); - } - if (!sigismember(&pending_set, LTTNG_CONSUMER_SIG_SWITCH)) { - break; - } - caa_cpu_relax(); - } - - /* - * From this point, no new signal handler will be fired that would try to - * access "chan". However, we still need to wait for any currently - * executing handler to complete. - */ - cmm_smp_mb(); - CMM_STORE_SHARED(timer_signal.qs_done, 0); - cmm_smp_mb(); - - /* - * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes - * up. - */ - kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); - - while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { - caa_cpu_relax(); - } - cmm_smp_mb(); - - pthread_mutex_unlock(&timer_signal.lock); -} - -/* - * Set the timer for periodical metadata flush. - */ -void consumer_timer_switch_start(struct lttng_consumer_channel *channel, - unsigned int switch_timer_interval) -{ - int ret; - struct sigevent sev; - struct itimerspec its; - - assert(channel); - assert(channel->key); - - if (switch_timer_interval == 0) { - return; - } - - sev.sigev_notify = SIGEV_SIGNAL; - sev.sigev_signo = LTTNG_CONSUMER_SIG_SWITCH; - sev.sigev_value.sival_ptr = channel; - ret = timer_create(CLOCKID, &sev, &channel->switch_timer); - if (ret == -1) { - PERROR("timer_create"); - } - channel->switch_timer_enabled = 1; - - its.it_value.tv_sec = switch_timer_interval / 1000000; - its.it_value.tv_nsec = switch_timer_interval % 1000000; - its.it_interval.tv_sec = its.it_value.tv_sec; - its.it_interval.tv_nsec = its.it_value.tv_nsec; - - ret = timer_settime(channel->switch_timer, 0, &its, NULL); - if (ret == -1) { - PERROR("timer_settime"); - } -} - -/* - * Stop and delete timer. - */ -void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) -{ - int ret; - - assert(channel); - - ret = timer_delete(channel->switch_timer); - if (ret == -1) { - PERROR("timer_delete"); - } - - consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_SWITCH); - - channel->switch_timer = 0; - channel->switch_timer_enabled = 0; -} - -/* - * Set the timer for the live mode. - */ -void consumer_timer_live_start(struct lttng_consumer_channel *channel, - int live_timer_interval) -{ - int ret; - struct sigevent sev; - struct itimerspec its; - - assert(channel); - assert(channel->key); - - if (live_timer_interval <= 0) { - return; - } - - sev.sigev_notify = SIGEV_SIGNAL; - sev.sigev_signo = LTTNG_CONSUMER_SIG_LIVE; - sev.sigev_value.sival_ptr = channel; - ret = timer_create(CLOCKID, &sev, &channel->live_timer); - if (ret == -1) { - PERROR("timer_create"); - } - channel->live_timer_enabled = 1; - - its.it_value.tv_sec = live_timer_interval / 1000000; - its.it_value.tv_nsec = live_timer_interval % 1000000; - its.it_interval.tv_sec = its.it_value.tv_sec; - its.it_interval.tv_nsec = its.it_value.tv_nsec; - - ret = timer_settime(channel->live_timer, 0, &its, NULL); - if (ret == -1) { - PERROR("timer_settime"); - } -} - -/* - * Stop and delete timer. - */ -void consumer_timer_live_stop(struct lttng_consumer_channel *channel) -{ - int ret; - - assert(channel); - - ret = timer_delete(channel->live_timer); - if (ret == -1) { - PERROR("timer_delete"); - } - - consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_LIVE); - - channel->live_timer = 0; - channel->live_timer_enabled = 0; -} - -/* - * Block the RT signals for the entire process. It must be called from the - * consumer main before creating the threads - */ -int consumer_signal_init(void) -{ - int ret; - sigset_t mask; - - /* Block signal for entire process, so only our thread processes it. */ - setmask(&mask); - ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); - if (ret) { - errno = ret; - PERROR("pthread_sigmask"); - return -1; - } - return 0; -} - -/* - * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, - * LTTNG_CONSUMER_SIG_TEARDOWN and LTTNG_CONSUMER_SIG_LIVE. - */ -void *consumer_timer_thread(void *data) -{ - int signr; - sigset_t mask; - siginfo_t info; - struct lttng_consumer_local_data *ctx = data; - - rcu_register_thread(); - - health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); - - if (testpoint(consumerd_thread_metadata_timer)) { - goto error_testpoint; - } - - health_code_update(); - - /* Only self thread will receive signal mask. */ - setmask(&mask); - CMM_STORE_SHARED(timer_signal.tid, pthread_self()); - - while (1) { - health_code_update(); - - health_poll_entry(); - signr = sigwaitinfo(&mask, &info); - health_poll_exit(); - if (signr == -1) { - if (errno != EINTR) { - PERROR("sigwaitinfo"); - } - continue; - } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { - metadata_switch_timer(ctx, info.si_signo, &info, NULL); - } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { - cmm_smp_mb(); - CMM_STORE_SHARED(timer_signal.qs_done, 1); - cmm_smp_mb(); - DBG("Signal timer metadata thread teardown"); - } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { - live_timer(ctx, info.si_signo, &info, NULL); - } else { - ERR("Unexpected signal %d\n", info.si_signo); - } - } - -error_testpoint: - /* Only reached in testpoint error */ - health_error(); - health_unregister(health_consumerd); - - rcu_unregister_thread(); - - /* Never return */ - return NULL; -} diff --git a/src/common/consumer-timer.h b/src/common/consumer-timer.h deleted file mode 100644 index 22e74574c..000000000 --- a/src/common/consumer-timer.h +++ /dev/null @@ -1,58 +0,0 @@ -/* - * Copyright (C) 2011 - Julien Desfossez - * Mathieu Desnoyers - * 2012 - David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#ifndef CONSUMER_TIMER_H -#define CONSUMER_TIMER_H - -#include - -#include "consumer.h" - -#define LTTNG_CONSUMER_SIG_SWITCH SIGRTMIN + 10 -#define LTTNG_CONSUMER_SIG_TEARDOWN SIGRTMIN + 11 -#define LTTNG_CONSUMER_SIG_LIVE SIGRTMIN + 12 - -#define CLOCKID CLOCK_MONOTONIC - -/* - * Handle timer teardown race wrt memory free of private data by consumer - * signals are handled by a single thread, which permits a synchronization - * point between handling of each signal. Internal lock ensures mutual - * exclusion. - */ -struct timer_signal_data { - pthread_t tid; /* thread id managing signals */ - int setup_done; - int qs_done; - pthread_mutex_t lock; -}; - -void consumer_timer_switch_start(struct lttng_consumer_channel *channel, - unsigned int switch_timer_interval); -void consumer_timer_switch_stop(struct lttng_consumer_channel *channel); -void consumer_timer_live_start(struct lttng_consumer_channel *channel, - int live_timer_interval); -void consumer_timer_live_stop(struct lttng_consumer_channel *channel); -void *consumer_timer_thread(void *data); -int consumer_signal_init(void); - -int consumer_flush_kernel_index(struct lttng_consumer_stream *stream); -int consumer_flush_ust_index(struct lttng_consumer_stream *stream); - -#endif /* CONSUMER_TIMER_H */ diff --git a/src/common/consumer.c b/src/common/consumer.c deleted file mode 100644 index 9909fc13c..000000000 --- a/src/common/consumer.c +++ /dev/null @@ -1,3713 +0,0 @@ -/* - * Copyright (C) 2011 - Julien Desfossez - * Mathieu Desnoyers - * 2012 - David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "consumer.h" -#include "consumer-stream.h" -#include "consumer-testpoint.h" -#include "align.h" - -struct lttng_consumer_global_data consumer_data = { - .stream_count = 0, - .need_update = 1, - .type = LTTNG_CONSUMER_UNKNOWN, -}; - -enum consumer_channel_action { - CONSUMER_CHANNEL_ADD, - CONSUMER_CHANNEL_DEL, - CONSUMER_CHANNEL_QUIT, -}; - -struct consumer_channel_msg { - enum consumer_channel_action action; - struct lttng_consumer_channel *chan; /* add */ - uint64_t key; /* del */ -}; - -/* - * Flag to inform the polling thread to quit when all fd hung up. Updated by - * the consumer_thread_receive_fds when it notices that all fds has hung up. - * Also updated by the signal handler (consumer_should_exit()). Read by the - * polling threads. - */ -volatile int consumer_quit; - -/* - * Global hash table containing respectively metadata and data streams. The - * stream element in this ht should only be updated by the metadata poll thread - * for the metadata and the data poll thread for the data. - */ -static struct lttng_ht *metadata_ht; -static struct lttng_ht *data_ht; - -/* - * Notify a thread lttng pipe to poll back again. This usually means that some - * global state has changed so we just send back the thread in a poll wait - * call. - */ -static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) -{ - struct lttng_consumer_stream *null_stream = NULL; - - assert(pipe); - - (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); -} - -static void notify_health_quit_pipe(int *pipe) -{ - ssize_t ret; - - ret = lttng_write(pipe[1], "4", 1); - if (ret < 1) { - PERROR("write consumer health quit"); - } -} - -static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, - struct lttng_consumer_channel *chan, - uint64_t key, - enum consumer_channel_action action) -{ - struct consumer_channel_msg msg; - ssize_t ret; - - memset(&msg, 0, sizeof(msg)); - - msg.action = action; - msg.chan = chan; - msg.key = key; - ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); - if (ret < sizeof(msg)) { - PERROR("notify_channel_pipe write error"); - } -} - -void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, - uint64_t key) -{ - notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); -} - -static int read_channel_pipe(struct lttng_consumer_local_data *ctx, - struct lttng_consumer_channel **chan, - uint64_t *key, - enum consumer_channel_action *action) -{ - struct consumer_channel_msg msg; - ssize_t ret; - - ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); - if (ret < sizeof(msg)) { - ret = -1; - goto error; - } - *action = msg.action; - *chan = msg.chan; - *key = msg.key; -error: - return (int) ret; -} - -/* - * Cleanup the stream list of a channel. Those streams are not yet globally - * visible - */ -static void clean_channel_stream_list(struct lttng_consumer_channel *channel) -{ - struct lttng_consumer_stream *stream, *stmp; - - assert(channel); - - /* Delete streams that might have been left in the stream list. */ - cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, - send_node) { - cds_list_del(&stream->send_node); - /* - * Once a stream is added to this list, the buffers were created so we - * have a guarantee that this call will succeed. Setting the monitor - * mode to 0 so we don't lock nor try to delete the stream from the - * global hash table. - */ - stream->monitor = 0; - consumer_stream_destroy(stream, NULL); - } -} - -/* - * Find a stream. The consumer_data.lock must be locked during this - * call. - */ -static struct lttng_consumer_stream *find_stream(uint64_t key, - struct lttng_ht *ht) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct lttng_consumer_stream *stream = NULL; - - assert(ht); - - /* -1ULL keys are lookup failures */ - if (key == (uint64_t) -1ULL) { - return NULL; - } - - rcu_read_lock(); - - lttng_ht_lookup(ht, &key, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node != NULL) { - stream = caa_container_of(node, struct lttng_consumer_stream, node); - } - - rcu_read_unlock(); - - return stream; -} - -static void steal_stream_key(uint64_t key, struct lttng_ht *ht) -{ - struct lttng_consumer_stream *stream; - - rcu_read_lock(); - stream = find_stream(key, ht); - if (stream) { - stream->key = (uint64_t) -1ULL; - /* - * We don't want the lookup to match, but we still need - * to iterate on this stream when iterating over the hash table. Just - * change the node key. - */ - stream->node.key = (uint64_t) -1ULL; - } - rcu_read_unlock(); -} - -/* - * Return a channel object for the given key. - * - * RCU read side lock MUST be acquired before calling this function and - * protects the channel ptr. - */ -struct lttng_consumer_channel *consumer_find_channel(uint64_t key) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct lttng_consumer_channel *channel = NULL; - - /* -1ULL keys are lookup failures */ - if (key == (uint64_t) -1ULL) { - return NULL; - } - - lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node != NULL) { - channel = caa_container_of(node, struct lttng_consumer_channel, node); - } - - return channel; -} - -/* - * There is a possibility that the consumer does not have enough time between - * the close of the channel on the session daemon and the cleanup in here thus - * once we have a channel add with an existing key, we know for sure that this - * channel will eventually get cleaned up by all streams being closed. - * - * This function just nullifies the already existing channel key. - */ -static void steal_channel_key(uint64_t key) -{ - struct lttng_consumer_channel *channel; - - rcu_read_lock(); - channel = consumer_find_channel(key); - if (channel) { - channel->key = (uint64_t) -1ULL; - /* - * We don't want the lookup to match, but we still need to iterate on - * this channel when iterating over the hash table. Just change the - * node key. - */ - channel->node.key = (uint64_t) -1ULL; - } - rcu_read_unlock(); -} - -static void free_channel_rcu(struct rcu_head *head) -{ - struct lttng_ht_node_u64 *node = - caa_container_of(head, struct lttng_ht_node_u64, head); - struct lttng_consumer_channel *channel = - caa_container_of(node, struct lttng_consumer_channel, node); - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - lttng_ustconsumer_free_channel(channel); - break; - default: - ERR("Unknown consumer_data type"); - abort(); - } - free(channel); -} - -/* - * RCU protected relayd socket pair free. - */ -static void free_relayd_rcu(struct rcu_head *head) -{ - struct lttng_ht_node_u64 *node = - caa_container_of(head, struct lttng_ht_node_u64, head); - struct consumer_relayd_sock_pair *relayd = - caa_container_of(node, struct consumer_relayd_sock_pair, node); - - /* - * Close all sockets. This is done in the call RCU since we don't want the - * socket fds to be reassigned thus potentially creating bad state of the - * relayd object. - * - * We do not have to lock the control socket mutex here since at this stage - * there is no one referencing to this relayd object. - */ - (void) relayd_close(&relayd->control_sock); - (void) relayd_close(&relayd->data_sock); - - free(relayd); -} - -/* - * Destroy and free relayd socket pair object. - */ -void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) -{ - int ret; - struct lttng_ht_iter iter; - - if (relayd == NULL) { - return; - } - - DBG("Consumer destroy and close relayd socket pair"); - - iter.iter.node = &relayd->node.node; - ret = lttng_ht_del(consumer_data.relayd_ht, &iter); - if (ret != 0) { - /* We assume the relayd is being or is destroyed */ - return; - } - - /* RCU free() call */ - call_rcu(&relayd->node.head, free_relayd_rcu); -} - -/* - * Remove a channel from the global list protected by a mutex. This function is - * also responsible for freeing its data structures. - */ -void consumer_del_channel(struct lttng_consumer_channel *channel) -{ - int ret; - struct lttng_ht_iter iter; - - DBG("Consumer delete channel key %" PRIu64, channel->key); - - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&channel->lock); - - /* Destroy streams that might have been left in the stream list. */ - clean_channel_stream_list(channel); - - if (channel->live_timer_enabled == 1) { - consumer_timer_live_stop(channel); - } - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - lttng_ustconsumer_del_channel(channel); - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - goto end; - } - - rcu_read_lock(); - iter.iter.node = &channel->node.node; - ret = lttng_ht_del(consumer_data.channel_ht, &iter); - assert(!ret); - rcu_read_unlock(); - - call_rcu(&channel->node.head, free_channel_rcu); -end: - pthread_mutex_unlock(&channel->lock); - pthread_mutex_unlock(&consumer_data.lock); -} - -/* - * Iterate over the relayd hash table and destroy each element. Finally, - * destroy the whole hash table. - */ -static void cleanup_relayd_ht(void) -{ - struct lttng_ht_iter iter; - struct consumer_relayd_sock_pair *relayd; - - rcu_read_lock(); - - cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, - node.node) { - consumer_destroy_relayd(relayd); - } - - rcu_read_unlock(); - - lttng_ht_destroy(consumer_data.relayd_ht); -} - -/* - * Update the end point status of all streams having the given network sequence - * index (relayd index). - * - * It's atomically set without having the stream mutex locked which is fine - * because we handle the write/read race with a pipe wakeup for each thread. - */ -static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, - enum consumer_endpoint_status status) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); - - rcu_read_lock(); - - /* Let's begin with metadata */ - cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { - if (stream->net_seq_idx == net_seq_idx) { - uatomic_set(&stream->endpoint_status, status); - DBG("Delete flag set to metadata stream %d", stream->wait_fd); - } - } - - /* Follow up by the data streams */ - cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { - if (stream->net_seq_idx == net_seq_idx) { - uatomic_set(&stream->endpoint_status, status); - DBG("Delete flag set to data stream %d", stream->wait_fd); - } - } - rcu_read_unlock(); -} - -/* - * Cleanup a relayd object by flagging every associated streams for deletion, - * destroying the object meaning removing it from the relayd hash table, - * closing the sockets and freeing the memory in a RCU call. - * - * If a local data context is available, notify the threads that the streams' - * state have changed. - */ -static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, - struct lttng_consumer_local_data *ctx) -{ - uint64_t netidx; - - assert(relayd); - - DBG("Cleaning up relayd sockets"); - - /* Save the net sequence index before destroying the object */ - netidx = relayd->net_seq_idx; - - /* - * Delete the relayd from the relayd hash table, close the sockets and free - * the object in a RCU call. - */ - consumer_destroy_relayd(relayd); - - /* Set inactive endpoint to all streams */ - update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); - - /* - * With a local data context, notify the threads that the streams' state - * have changed. The write() action on the pipe acts as an "implicit" - * memory barrier ordering the updates of the end point status from the - * read of this status which happens AFTER receiving this notify. - */ - if (ctx) { - notify_thread_lttng_pipe(ctx->consumer_data_pipe); - notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); - } -} - -/* - * Flag a relayd socket pair for destruction. Destroy it if the refcount - * reaches zero. - * - * RCU read side lock MUST be aquired before calling this function. - */ -void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) -{ - assert(relayd); - - /* Set destroy flag for this object */ - uatomic_set(&relayd->destroy_flag, 1); - - /* Destroy the relayd if refcount is 0 */ - if (uatomic_read(&relayd->refcount) == 0) { - consumer_destroy_relayd(relayd); - } -} - -/* - * Completly destroy stream from every visiable data structure and the given - * hash table if one. - * - * One this call returns, the stream object is not longer usable nor visible. - */ -void consumer_del_stream(struct lttng_consumer_stream *stream, - struct lttng_ht *ht) -{ - consumer_stream_destroy(stream, ht); -} - -/* - * XXX naming of del vs destroy is all mixed up. - */ -void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) -{ - consumer_stream_destroy(stream, data_ht); -} - -void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) -{ - consumer_stream_destroy(stream, metadata_ht); -} - -struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, - uint64_t stream_key, - enum lttng_consumer_stream_state state, - const char *channel_name, - uid_t uid, - gid_t gid, - uint64_t relayd_id, - uint64_t session_id, - int cpu, - int *alloc_ret, - enum consumer_channel_type type, - unsigned int monitor) -{ - int ret; - struct lttng_consumer_stream *stream; - - stream = zmalloc(sizeof(*stream)); - if (stream == NULL) { - PERROR("malloc struct lttng_consumer_stream"); - ret = -ENOMEM; - goto end; - } - - rcu_read_lock(); - - stream->key = stream_key; - stream->out_fd = -1; - stream->out_fd_offset = 0; - stream->output_written = 0; - stream->state = state; - stream->uid = uid; - stream->gid = gid; - stream->net_seq_idx = relayd_id; - stream->session_id = session_id; - stream->monitor = monitor; - stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; - stream->index_fd = -1; - pthread_mutex_init(&stream->lock, NULL); - pthread_mutex_init(&stream->metadata_timer_lock, NULL); - - /* If channel is the metadata, flag this stream as metadata. */ - if (type == CONSUMER_CHANNEL_TYPE_METADATA) { - stream->metadata_flag = 1; - /* Metadata is flat out. */ - strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); - /* Live rendez-vous point. */ - pthread_cond_init(&stream->metadata_rdv, NULL); - pthread_mutex_init(&stream->metadata_rdv_lock, NULL); - } else { - /* Format stream name to _ */ - ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", - channel_name, cpu); - if (ret < 0) { - PERROR("snprintf stream name"); - goto error; - } - } - - /* Key is always the wait_fd for streams. */ - lttng_ht_node_init_u64(&stream->node, stream->key); - - /* Init node per channel id key */ - lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); - - /* Init session id node with the stream session id */ - lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); - - DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 - " relayd_id %" PRIu64 ", session_id %" PRIu64, - stream->name, stream->key, channel_key, - stream->net_seq_idx, stream->session_id); - - rcu_read_unlock(); - return stream; - -error: - rcu_read_unlock(); - free(stream); -end: - if (alloc_ret) { - *alloc_ret = ret; - } - return NULL; -} - -/* - * Add a stream to the global list protected by a mutex. - */ -int consumer_add_data_stream(struct lttng_consumer_stream *stream) -{ - struct lttng_ht *ht = data_ht; - int ret = 0; - - assert(stream); - assert(ht); - - DBG3("Adding consumer stream %" PRIu64, stream->key); - - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&stream->chan->lock); - pthread_mutex_lock(&stream->chan->timer_lock); - pthread_mutex_lock(&stream->lock); - rcu_read_lock(); - - /* Steal stream identifier to avoid having streams with the same key */ - steal_stream_key(stream->key, ht); - - lttng_ht_add_unique_u64(ht, &stream->node); - - lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, - &stream->node_channel_id); - - /* - * Add stream to the stream_list_ht of the consumer data. No need to steal - * the key since the HT does not use it and we allow to add redundant keys - * into this table. - */ - lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); - - /* - * When nb_init_stream_left reaches 0, we don't need to trigger any action - * in terms of destroying the associated channel, because the action that - * causes the count to become 0 also causes a stream to be added. The - * channel deletion will thus be triggered by the following removal of this - * stream. - */ - if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { - /* Increment refcount before decrementing nb_init_stream_left */ - cmm_smp_wmb(); - uatomic_dec(&stream->chan->nb_init_stream_left); - } - - /* Update consumer data once the node is inserted. */ - consumer_data.stream_count++; - consumer_data.need_update = 1; - - rcu_read_unlock(); - pthread_mutex_unlock(&stream->lock); - pthread_mutex_unlock(&stream->chan->timer_lock); - pthread_mutex_unlock(&stream->chan->lock); - pthread_mutex_unlock(&consumer_data.lock); - - return ret; -} - -void consumer_del_data_stream(struct lttng_consumer_stream *stream) -{ - consumer_del_stream(stream, data_ht); -} - -/* - * Add relayd socket to global consumer data hashtable. RCU read side lock MUST - * be acquired before calling this. - */ -static int add_relayd(struct consumer_relayd_sock_pair *relayd) -{ - int ret = 0; - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - - assert(relayd); - - lttng_ht_lookup(consumer_data.relayd_ht, - &relayd->net_seq_idx, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node != NULL) { - goto end; - } - lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); - -end: - return ret; -} - -/* - * Allocate and return a consumer relayd socket. - */ -static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( - uint64_t net_seq_idx) -{ - struct consumer_relayd_sock_pair *obj = NULL; - - /* net sequence index of -1 is a failure */ - if (net_seq_idx == (uint64_t) -1ULL) { - goto error; - } - - obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); - if (obj == NULL) { - PERROR("zmalloc relayd sock"); - goto error; - } - - obj->net_seq_idx = net_seq_idx; - obj->refcount = 0; - obj->destroy_flag = 0; - obj->control_sock.sock.fd = -1; - obj->data_sock.sock.fd = -1; - lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); - pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); - -error: - return obj; -} - -/* - * Find a relayd socket pair in the global consumer data. - * - * Return the object if found else NULL. - * RCU read-side lock must be held across this call and while using the - * returned object. - */ -struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct consumer_relayd_sock_pair *relayd = NULL; - - /* Negative keys are lookup failures */ - if (key == (uint64_t) -1ULL) { - goto error; - } - - lttng_ht_lookup(consumer_data.relayd_ht, &key, - &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node != NULL) { - relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); - } - -error: - return relayd; -} - -/* - * Find a relayd and send the stream - * - * Returns 0 on success, < 0 on error - */ -int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, - char *path) -{ - int ret = 0; - struct consumer_relayd_sock_pair *relayd; - - assert(stream); - assert(stream->net_seq_idx != -1ULL); - assert(path); - - /* The stream is not metadata. Get relayd reference if exists. */ - rcu_read_lock(); - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd != NULL) { - /* Add stream on the relayd */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_add_stream(&relayd->control_sock, stream->name, - path, &stream->relayd_stream_id, - stream->chan->tracefile_size, stream->chan->tracefile_count); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret < 0) { - goto end; - } - - uatomic_inc(&relayd->refcount); - stream->sent_to_relayd = 1; - } else { - ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", - stream->key, stream->net_seq_idx); - ret = -1; - goto end; - } - - DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, - stream->name, stream->key, stream->net_seq_idx); - -end: - rcu_read_unlock(); - return ret; -} - -/* - * Find a relayd and send the streams sent message - * - * Returns 0 on success, < 0 on error - */ -int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) -{ - int ret = 0; - struct consumer_relayd_sock_pair *relayd; - - assert(net_seq_idx != -1ULL); - - /* The stream is not metadata. Get relayd reference if exists. */ - rcu_read_lock(); - relayd = consumer_find_relayd(net_seq_idx); - if (relayd != NULL) { - /* Add stream on the relayd */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_streams_sent(&relayd->control_sock); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret < 0) { - goto end; - } - } else { - ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", - net_seq_idx); - ret = -1; - goto end; - } - - ret = 0; - DBG("All streams sent relayd id %" PRIu64, net_seq_idx); - -end: - rcu_read_unlock(); - return ret; -} - -/* - * Find a relayd and close the stream - */ -void close_relayd_stream(struct lttng_consumer_stream *stream) -{ - struct consumer_relayd_sock_pair *relayd; - - /* The stream is not metadata. Get relayd reference if exists. */ - rcu_read_lock(); - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd) { - consumer_stream_relayd_close(stream, relayd); - } - rcu_read_unlock(); -} - -/* - * Handle stream for relayd transmission if the stream applies for network - * streaming where the net sequence index is set. - * - * Return destination file descriptor or negative value on error. - */ -static int write_relayd_stream_header(struct lttng_consumer_stream *stream, - size_t data_size, unsigned long padding, - struct consumer_relayd_sock_pair *relayd) -{ - int outfd = -1, ret; - struct lttcomm_relayd_data_hdr data_hdr; - - /* Safety net */ - assert(stream); - assert(relayd); - - /* Reset data header */ - memset(&data_hdr, 0, sizeof(data_hdr)); - - if (stream->metadata_flag) { - /* Caller MUST acquire the relayd control socket lock */ - ret = relayd_send_metadata(&relayd->control_sock, data_size); - if (ret < 0) { - goto error; - } - - /* Metadata are always sent on the control socket. */ - outfd = relayd->control_sock.sock.fd; - } else { - /* Set header with stream information */ - data_hdr.stream_id = htobe64(stream->relayd_stream_id); - data_hdr.data_size = htobe32(data_size); - data_hdr.padding_size = htobe32(padding); - /* - * Note that net_seq_num below is assigned with the *current* value of - * next_net_seq_num and only after that the next_net_seq_num will be - * increment. This is why when issuing a command on the relayd using - * this next value, 1 should always be substracted in order to compare - * the last seen sequence number on the relayd side to the last sent. - */ - data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); - /* Other fields are zeroed previously */ - - ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, - sizeof(data_hdr)); - if (ret < 0) { - goto error; - } - - ++stream->next_net_seq_num; - - /* Set to go on data socket */ - outfd = relayd->data_sock.sock.fd; - } - -error: - return outfd; -} - -/* - * Allocate and return a new lttng_consumer_channel object using the given key - * to initialize the hash table node. - * - * On error, return NULL. - */ -struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, - uint64_t session_id, - const char *pathname, - const char *name, - uid_t uid, - gid_t gid, - uint64_t relayd_id, - enum lttng_event_output output, - uint64_t tracefile_size, - uint64_t tracefile_count, - uint64_t session_id_per_pid, - unsigned int monitor, - unsigned int live_timer_interval, - const char *root_shm_path, - const char *shm_path) -{ - struct lttng_consumer_channel *channel; - - channel = zmalloc(sizeof(*channel)); - if (channel == NULL) { - PERROR("malloc struct lttng_consumer_channel"); - goto end; - } - - channel->key = key; - channel->refcount = 0; - channel->session_id = session_id; - channel->session_id_per_pid = session_id_per_pid; - channel->uid = uid; - channel->gid = gid; - channel->relayd_id = relayd_id; - channel->tracefile_size = tracefile_size; - channel->tracefile_count = tracefile_count; - channel->monitor = monitor; - channel->live_timer_interval = live_timer_interval; - pthread_mutex_init(&channel->lock, NULL); - pthread_mutex_init(&channel->timer_lock, NULL); - - switch (output) { - case LTTNG_EVENT_SPLICE: - channel->output = CONSUMER_CHANNEL_SPLICE; - break; - case LTTNG_EVENT_MMAP: - channel->output = CONSUMER_CHANNEL_MMAP; - break; - default: - assert(0); - free(channel); - channel = NULL; - goto end; - } - - /* - * In monitor mode, the streams associated with the channel will be put in - * a special list ONLY owned by this channel. So, the refcount is set to 1 - * here meaning that the channel itself has streams that are referenced. - * - * On a channel deletion, once the channel is no longer visible, the - * refcount is decremented and checked for a zero value to delete it. With - * streams in no monitor mode, it will now be safe to destroy the channel. - */ - if (!channel->monitor) { - channel->refcount = 1; - } - - strncpy(channel->pathname, pathname, sizeof(channel->pathname)); - channel->pathname[sizeof(channel->pathname) - 1] = '\0'; - - strncpy(channel->name, name, sizeof(channel->name)); - channel->name[sizeof(channel->name) - 1] = '\0'; - - if (root_shm_path) { - strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path)); - channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0'; - } - if (shm_path) { - strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path)); - channel->shm_path[sizeof(channel->shm_path) - 1] = '\0'; - } - - lttng_ht_node_init_u64(&channel->node, channel->key); - - channel->wait_fd = -1; - - CDS_INIT_LIST_HEAD(&channel->streams.head); - - DBG("Allocated channel (key %" PRIu64 ")", channel->key) - -end: - return channel; -} - -/* - * Add a channel to the global list protected by a mutex. - * - * Always return 0 indicating success. - */ -int consumer_add_channel(struct lttng_consumer_channel *channel, - struct lttng_consumer_local_data *ctx) -{ - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&channel->lock); - pthread_mutex_lock(&channel->timer_lock); - - /* - * This gives us a guarantee that the channel we are about to add to the - * channel hash table will be unique. See this function comment on the why - * we need to steel the channel key at this stage. - */ - steal_channel_key(channel->key); - - rcu_read_lock(); - lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); - rcu_read_unlock(); - - pthread_mutex_unlock(&channel->timer_lock); - pthread_mutex_unlock(&channel->lock); - pthread_mutex_unlock(&consumer_data.lock); - - if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { - notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); - } - - return 0; -} - -/* - * Allocate the pollfd structure and the local view of the out fds to avoid - * doing a lookup in the linked list and concurrency issues when writing is - * needed. Called with consumer_data.lock held. - * - * Returns the number of fds in the structures. - */ -static int update_poll_array(struct lttng_consumer_local_data *ctx, - struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, - struct lttng_ht *ht) -{ - int i = 0; - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - assert(ctx); - assert(ht); - assert(pollfd); - assert(local_stream); - - DBG("Updating poll fd array"); - rcu_read_lock(); - cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { - /* - * Only active streams with an active end point can be added to the - * poll set and local stream storage of the thread. - * - * There is a potential race here for endpoint_status to be updated - * just after the check. However, this is OK since the stream(s) will - * be deleted once the thread is notified that the end point state has - * changed where this function will be called back again. - */ - if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || - stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { - continue; - } - /* - * This clobbers way too much the debug output. Uncomment that if you - * need it for debugging purposes. - * - * DBG("Active FD %d", stream->wait_fd); - */ - (*pollfd)[i].fd = stream->wait_fd; - (*pollfd)[i].events = POLLIN | POLLPRI; - local_stream[i] = stream; - i++; - } - rcu_read_unlock(); - - /* - * Insert the consumer_data_pipe at the end of the array and don't - * increment i so nb_fd is the number of real FD. - */ - (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); - (*pollfd)[i].events = POLLIN | POLLPRI; - - (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); - (*pollfd)[i + 1].events = POLLIN | POLLPRI; - return i; -} - -/* - * Poll on the should_quit pipe and the command socket return -1 on - * error, 1 if should exit, 0 if data is available on the command socket - */ -int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) -{ - int num_rdy; - -restart: - num_rdy = poll(consumer_sockpoll, 2, -1); - if (num_rdy == -1) { - /* - * Restart interrupted system call. - */ - if (errno == EINTR) { - goto restart; - } - PERROR("Poll error"); - return -1; - } - if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { - DBG("consumer_should_quit wake up"); - return 1; - } - return 0; -} - -/* - * Set the error socket. - */ -void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, - int sock) -{ - ctx->consumer_error_socket = sock; -} - -/* - * Set the command socket path. - */ -void lttng_consumer_set_command_sock_path( - struct lttng_consumer_local_data *ctx, char *sock) -{ - ctx->consumer_command_sock_path = sock; -} - -/* - * Send return code to the session daemon. - * If the socket is not defined, we return 0, it is not a fatal error - */ -int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) -{ - if (ctx->consumer_error_socket > 0) { - return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, - sizeof(enum lttcomm_sessiond_command)); - } - - return 0; -} - -/* - * Close all the tracefiles and stream fds and MUST be called when all - * instances are destroyed i.e. when all threads were joined and are ended. - */ -void lttng_consumer_cleanup(void) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_channel *channel; - - rcu_read_lock(); - - cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, - node.node) { - consumer_del_channel(channel); - } - - rcu_read_unlock(); - - lttng_ht_destroy(consumer_data.channel_ht); - - cleanup_relayd_ht(); - - lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); - - /* - * This HT contains streams that are freed by either the metadata thread or - * the data thread so we do *nothing* on the hash table and simply destroy - * it. - */ - lttng_ht_destroy(consumer_data.stream_list_ht); -} - -/* - * Called from signal handler. - */ -void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) -{ - ssize_t ret; - - consumer_quit = 1; - ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); - if (ret < 1) { - PERROR("write consumer quit"); - } - - DBG("Consumer flag that it should quit"); -} - -void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, - off_t orig_offset) -{ - int outfd = stream->out_fd; - - /* - * This does a blocking write-and-wait on any page that belongs to the - * subbuffer prior to the one we just wrote. - * Don't care about error values, as these are just hints and ways to - * limit the amount of page cache used. - */ - if (orig_offset < stream->max_sb_size) { - return; - } - lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, - stream->max_sb_size, - SYNC_FILE_RANGE_WAIT_BEFORE - | SYNC_FILE_RANGE_WRITE - | SYNC_FILE_RANGE_WAIT_AFTER); - /* - * Give hints to the kernel about how we access the file: - * POSIX_FADV_DONTNEED : we won't re-access data in a near future after - * we write it. - * - * We need to call fadvise again after the file grows because the - * kernel does not seem to apply fadvise to non-existing parts of the - * file. - * - * Call fadvise _after_ having waited for the page writeback to - * complete because the dirty page writeback semantic is not well - * defined. So it can be expected to lead to lower throughput in - * streaming. - */ - posix_fadvise(outfd, orig_offset - stream->max_sb_size, - stream->max_sb_size, POSIX_FADV_DONTNEED); -} - -/* - * Initialise the necessary environnement : - * - create a new context - * - create the poll_pipe - * - create the should_quit pipe (for signal handler) - * - create the thread pipe (for splice) - * - * Takes a function pointer as argument, this function is called when data is - * available on a buffer. This function is responsible to do the - * kernctl_get_next_subbuf, read the data with mmap or splice depending on the - * buffer configuration and then kernctl_put_next_subbuf at the end. - * - * Returns a pointer to the new context or NULL on error. - */ -struct lttng_consumer_local_data *lttng_consumer_create( - enum lttng_consumer_type type, - ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, - struct lttng_consumer_local_data *ctx), - int (*recv_channel)(struct lttng_consumer_channel *channel), - int (*recv_stream)(struct lttng_consumer_stream *stream), - int (*update_stream)(uint64_t stream_key, uint32_t state)) -{ - int ret; - struct lttng_consumer_local_data *ctx; - - assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || - consumer_data.type == type); - consumer_data.type = type; - - ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); - if (ctx == NULL) { - PERROR("allocating context"); - goto error; - } - - ctx->consumer_error_socket = -1; - ctx->consumer_metadata_socket = -1; - pthread_mutex_init(&ctx->metadata_socket_lock, NULL); - /* assign the callbacks */ - ctx->on_buffer_ready = buffer_ready; - ctx->on_recv_channel = recv_channel; - ctx->on_recv_stream = recv_stream; - ctx->on_update_stream = update_stream; - - ctx->consumer_data_pipe = lttng_pipe_open(0); - if (!ctx->consumer_data_pipe) { - goto error_poll_pipe; - } - - ctx->consumer_wakeup_pipe = lttng_pipe_open(0); - if (!ctx->consumer_wakeup_pipe) { - goto error_wakeup_pipe; - } - - ret = pipe(ctx->consumer_should_quit); - if (ret < 0) { - PERROR("Error creating recv pipe"); - goto error_quit_pipe; - } - - ret = pipe(ctx->consumer_channel_pipe); - if (ret < 0) { - PERROR("Error creating channel pipe"); - goto error_channel_pipe; - } - - ctx->consumer_metadata_pipe = lttng_pipe_open(0); - if (!ctx->consumer_metadata_pipe) { - goto error_metadata_pipe; - } - - return ctx; - -error_metadata_pipe: - utils_close_pipe(ctx->consumer_channel_pipe); -error_channel_pipe: - utils_close_pipe(ctx->consumer_should_quit); -error_quit_pipe: - lttng_pipe_destroy(ctx->consumer_wakeup_pipe); -error_wakeup_pipe: - lttng_pipe_destroy(ctx->consumer_data_pipe); -error_poll_pipe: - free(ctx); -error: - return NULL; -} - -/* - * Iterate over all streams of the hashtable and free them properly. - */ -static void destroy_data_stream_ht(struct lttng_ht *ht) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - if (ht == NULL) { - return; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { - /* - * Ignore return value since we are currently cleaning up so any error - * can't be handled. - */ - (void) consumer_del_stream(stream, ht); - } - rcu_read_unlock(); - - lttng_ht_destroy(ht); -} - -/* - * Iterate over all streams of the metadata hashtable and free them - * properly. - */ -static void destroy_metadata_stream_ht(struct lttng_ht *ht) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - if (ht == NULL) { - return; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { - /* - * Ignore return value since we are currently cleaning up so any error - * can't be handled. - */ - (void) consumer_del_metadata_stream(stream, ht); - } - rcu_read_unlock(); - - lttng_ht_destroy(ht); -} - -/* - * Close all fds associated with the instance and free the context. - */ -void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) -{ - int ret; - - DBG("Consumer destroying it. Closing everything."); - - if (!ctx) { - return; - } - - destroy_data_stream_ht(data_ht); - destroy_metadata_stream_ht(metadata_ht); - - ret = close(ctx->consumer_error_socket); - if (ret) { - PERROR("close"); - } - ret = close(ctx->consumer_metadata_socket); - if (ret) { - PERROR("close"); - } - utils_close_pipe(ctx->consumer_channel_pipe); - lttng_pipe_destroy(ctx->consumer_data_pipe); - lttng_pipe_destroy(ctx->consumer_metadata_pipe); - lttng_pipe_destroy(ctx->consumer_wakeup_pipe); - utils_close_pipe(ctx->consumer_should_quit); - - unlink(ctx->consumer_command_sock_path); - free(ctx); -} - -/* - * Write the metadata stream id on the specified file descriptor. - */ -static int write_relayd_metadata_id(int fd, - struct lttng_consumer_stream *stream, - struct consumer_relayd_sock_pair *relayd, unsigned long padding) -{ - ssize_t ret; - struct lttcomm_relayd_metadata_payload hdr; - - hdr.stream_id = htobe64(stream->relayd_stream_id); - hdr.padding_size = htobe32(padding); - ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); - if (ret < sizeof(hdr)) { - /* - * This error means that the fd's end is closed so ignore the PERROR - * not to clubber the error output since this can happen in a normal - * code path. - */ - if (errno != EPIPE) { - PERROR("write metadata stream id"); - } - DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); - /* - * Set ret to a negative value because if ret != sizeof(hdr), we don't - * handle writting the missing part so report that as an error and - * don't lie to the caller. - */ - ret = -1; - goto end; - } - DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", - stream->relayd_stream_id, padding); - -end: - return (int) ret; -} - -/* - * Mmap the ring buffer, read it and write the data to the tracefile. This is a - * core function for writing trace buffers to either the local filesystem or - * the network. - * - * It must be called with the stream lock held. - * - * Careful review MUST be put if any changes occur! - * - * Returns the number of bytes written - */ -ssize_t lttng_consumer_on_read_subbuffer_mmap( - struct lttng_consumer_local_data *ctx, - struct lttng_consumer_stream *stream, unsigned long len, - unsigned long padding, - struct ctf_packet_index *index) -{ - unsigned long mmap_offset; - void *mmap_base; - ssize_t ret = 0; - off_t orig_offset = stream->out_fd_offset; - /* Default is on the disk */ - int outfd = stream->out_fd; - struct consumer_relayd_sock_pair *relayd = NULL; - unsigned int relayd_hang_up = 0; - - /* RCU lock for the relayd pointer */ - rcu_read_lock(); - - /* Flag that the current stream if set for network streaming. */ - if (stream->net_seq_idx != (uint64_t) -1ULL) { - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd == NULL) { - ret = -EPIPE; - goto end; - } - } - - /* get the offset inside the fd to mmap */ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - mmap_base = stream->mmap_base; - ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); - if (ret < 0) { - ret = -errno; - PERROR("tracer ctl get_mmap_read_offset"); - goto end; - } - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - mmap_base = lttng_ustctl_get_mmap_base(stream); - if (!mmap_base) { - ERR("read mmap get mmap base for stream %s", stream->name); - ret = -EPERM; - goto end; - } - ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); - if (ret != 0) { - PERROR("tracer ctl get_mmap_read_offset"); - ret = -EINVAL; - goto end; - } - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - } - - /* Handle stream on the relayd if the output is on the network */ - if (relayd) { - unsigned long netlen = len; - - /* - * Lock the control socket for the complete duration of the function - * since from this point on we will use the socket. - */ - if (stream->metadata_flag) { - /* Metadata requires the control socket. */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - netlen += sizeof(struct lttcomm_relayd_metadata_payload); - } - - ret = write_relayd_stream_header(stream, netlen, padding, relayd); - if (ret < 0) { - relayd_hang_up = 1; - goto write_error; - } - /* Use the returned socket. */ - outfd = ret; - - /* Write metadata stream id before payload */ - if (stream->metadata_flag) { - ret = write_relayd_metadata_id(outfd, stream, relayd, padding); - if (ret < 0) { - relayd_hang_up = 1; - goto write_error; - } - } - } else { - /* No streaming, we have to set the len with the full padding */ - len += padding; - - /* - * Check if we need to change the tracefile before writing the packet. - */ - if (stream->chan->tracefile_size > 0 && - (stream->tracefile_size_current + len) > - stream->chan->tracefile_size) { - ret = utils_rotate_stream_file(stream->chan->pathname, - stream->name, stream->chan->tracefile_size, - stream->chan->tracefile_count, stream->uid, stream->gid, - stream->out_fd, &(stream->tracefile_count_current), - &stream->out_fd); - if (ret < 0) { - ERR("Rotating output file"); - goto end; - } - outfd = stream->out_fd; - - if (stream->index_fd >= 0) { - ret = index_create_file(stream->chan->pathname, - stream->name, stream->uid, stream->gid, - stream->chan->tracefile_size, - stream->tracefile_count_current); - if (ret < 0) { - goto end; - } - stream->index_fd = ret; - } - - /* Reset current size because we just perform a rotation. */ - stream->tracefile_size_current = 0; - stream->out_fd_offset = 0; - orig_offset = 0; - } - stream->tracefile_size_current += len; - if (index) { - index->offset = htobe64(stream->out_fd_offset); - } - } - - /* - * This call guarantee that len or less is returned. It's impossible to - * receive a ret value that is bigger than len. - */ - ret = lttng_write(outfd, mmap_base + mmap_offset, len); - DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); - if (ret < 0 || ((size_t) ret != len)) { - /* - * Report error to caller if nothing was written else at least send the - * amount written. - */ - if (ret < 0) { - ret = -errno; - } - relayd_hang_up = 1; - - /* Socket operation failed. We consider the relayd dead */ - if (errno == EPIPE || errno == EINVAL || errno == EBADF) { - /* - * This is possible if the fd is closed on the other side - * (outfd) or any write problem. It can be verbose a bit for a - * normal execution if for instance the relayd is stopped - * abruptly. This can happen so set this to a DBG statement. - */ - DBG("Consumer mmap write detected relayd hang up"); - } else { - /* Unhandled error, print it and stop function right now. */ - PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); - } - goto write_error; - } - stream->output_written += ret; - - /* This call is useless on a socket so better save a syscall. */ - if (!relayd) { - /* This won't block, but will start writeout asynchronously */ - lttng_sync_file_range(outfd, stream->out_fd_offset, len, - SYNC_FILE_RANGE_WRITE); - stream->out_fd_offset += len; - } - lttng_consumer_sync_trace_file(stream, orig_offset); - -write_error: - /* - * This is a special case that the relayd has closed its socket. Let's - * cleanup the relayd object and all associated streams. - */ - if (relayd && relayd_hang_up) { - cleanup_relayd(relayd, ctx); - } - -end: - /* Unlock only if ctrl socket used */ - if (relayd && stream->metadata_flag) { - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - } - - rcu_read_unlock(); - return ret; -} - -/* - * Splice the data from the ring buffer to the tracefile. - * - * It must be called with the stream lock held. - * - * Returns the number of bytes spliced. - */ -ssize_t lttng_consumer_on_read_subbuffer_splice( - struct lttng_consumer_local_data *ctx, - struct lttng_consumer_stream *stream, unsigned long len, - unsigned long padding, - struct ctf_packet_index *index) -{ - ssize_t ret = 0, written = 0, ret_splice = 0; - loff_t offset = 0; - off_t orig_offset = stream->out_fd_offset; - int fd = stream->wait_fd; - /* Default is on the disk */ - int outfd = stream->out_fd; - struct consumer_relayd_sock_pair *relayd = NULL; - int *splice_pipe; - unsigned int relayd_hang_up = 0; - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - /* Not supported for user space tracing */ - return -ENOSYS; - default: - ERR("Unknown consumer_data type"); - assert(0); - } - - /* RCU lock for the relayd pointer */ - rcu_read_lock(); - - /* Flag that the current stream if set for network streaming. */ - if (stream->net_seq_idx != (uint64_t) -1ULL) { - relayd = consumer_find_relayd(stream->net_seq_idx); - if (relayd == NULL) { - written = -ret; - goto end; - } - } - splice_pipe = stream->splice_pipe; - - /* Write metadata stream id before payload */ - if (relayd) { - unsigned long total_len = len; - - if (stream->metadata_flag) { - /* - * Lock the control socket for the complete duration of the function - * since from this point on we will use the socket. - */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - - ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, - padding); - if (ret < 0) { - written = ret; - relayd_hang_up = 1; - goto write_error; - } - - total_len += sizeof(struct lttcomm_relayd_metadata_payload); - } - - ret = write_relayd_stream_header(stream, total_len, padding, relayd); - if (ret < 0) { - written = ret; - relayd_hang_up = 1; - goto write_error; - } - /* Use the returned socket. */ - outfd = ret; - } else { - /* No streaming, we have to set the len with the full padding */ - len += padding; - - /* - * Check if we need to change the tracefile before writing the packet. - */ - if (stream->chan->tracefile_size > 0 && - (stream->tracefile_size_current + len) > - stream->chan->tracefile_size) { - ret = utils_rotate_stream_file(stream->chan->pathname, - stream->name, stream->chan->tracefile_size, - stream->chan->tracefile_count, stream->uid, stream->gid, - stream->out_fd, &(stream->tracefile_count_current), - &stream->out_fd); - if (ret < 0) { - written = ret; - ERR("Rotating output file"); - goto end; - } - outfd = stream->out_fd; - - if (stream->index_fd >= 0) { - ret = index_create_file(stream->chan->pathname, - stream->name, stream->uid, stream->gid, - stream->chan->tracefile_size, - stream->tracefile_count_current); - if (ret < 0) { - written = ret; - goto end; - } - stream->index_fd = ret; - } - - /* Reset current size because we just perform a rotation. */ - stream->tracefile_size_current = 0; - stream->out_fd_offset = 0; - orig_offset = 0; - } - stream->tracefile_size_current += len; - index->offset = htobe64(stream->out_fd_offset); - } - - while (len > 0) { - DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", - (unsigned long)offset, len, fd, splice_pipe[1]); - ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, - SPLICE_F_MOVE | SPLICE_F_MORE); - DBG("splice chan to pipe, ret %zd", ret_splice); - if (ret_splice < 0) { - ret = errno; - written = -ret; - PERROR("Error in relay splice"); - goto splice_error; - } - - /* Handle stream on the relayd if the output is on the network */ - if (relayd && stream->metadata_flag) { - size_t metadata_payload_size = - sizeof(struct lttcomm_relayd_metadata_payload); - - /* Update counter to fit the spliced data */ - ret_splice += metadata_payload_size; - len += metadata_payload_size; - /* - * We do this so the return value can match the len passed as - * argument to this function. - */ - written -= metadata_payload_size; - } - - /* Splice data out */ - ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, - ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); - DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", - outfd, ret_splice); - if (ret_splice < 0) { - ret = errno; - written = -ret; - relayd_hang_up = 1; - goto write_error; - } else if (ret_splice > len) { - /* - * We don't expect this code path to be executed but you never know - * so this is an extra protection agains a buggy splice(). - */ - ret = errno; - written += ret_splice; - PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, - len); - goto splice_error; - } else { - /* All good, update current len and continue. */ - len -= ret_splice; - } - - /* This call is useless on a socket so better save a syscall. */ - if (!relayd) { - /* This won't block, but will start writeout asynchronously */ - lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, - SYNC_FILE_RANGE_WRITE); - stream->out_fd_offset += ret_splice; - } - stream->output_written += ret_splice; - written += ret_splice; - } - lttng_consumer_sync_trace_file(stream, orig_offset); - goto end; - -write_error: - /* - * This is a special case that the relayd has closed its socket. Let's - * cleanup the relayd object and all associated streams. - */ - if (relayd && relayd_hang_up) { - cleanup_relayd(relayd, ctx); - /* Skip splice error so the consumer does not fail */ - goto end; - } - -splice_error: - /* send the appropriate error description to sessiond */ - switch (ret) { - case EINVAL: - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); - break; - case ENOMEM: - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); - break; - case ESPIPE: - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); - break; - } - -end: - if (relayd && stream->metadata_flag) { - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - } - - rcu_read_unlock(); - return written; -} - -/* - * Take a snapshot for a specific fd - * - * Returns 0 on success, < 0 on error - */ -int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) -{ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - return lttng_kconsumer_take_snapshot(stream); - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - return lttng_ustconsumer_take_snapshot(stream); - default: - ERR("Unknown consumer_data type"); - assert(0); - return -ENOSYS; - } -} - -/* - * Get the produced position - * - * Returns 0 on success, < 0 on error - */ -int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, - unsigned long *pos) -{ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - return lttng_kconsumer_get_produced_snapshot(stream, pos); - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - return lttng_ustconsumer_get_produced_snapshot(stream, pos); - default: - ERR("Unknown consumer_data type"); - assert(0); - return -ENOSYS; - } -} - -int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, - int sock, struct pollfd *consumer_sockpoll) -{ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); - default: - ERR("Unknown consumer_data type"); - assert(0); - return -ENOSYS; - } -} - -void lttng_consumer_close_all_metadata(void) -{ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - /* - * The Kernel consumer has a different metadata scheme so we don't - * close anything because the stream will be closed by the session - * daemon. - */ - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - /* - * Close all metadata streams. The metadata hash table is passed and - * this call iterates over it by closing all wakeup fd. This is safe - * because at this point we are sure that the metadata producer is - * either dead or blocked. - */ - lttng_ustconsumer_close_all_metadata(metadata_ht); - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - } -} - -/* - * Clean up a metadata stream and free its memory. - */ -void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, - struct lttng_ht *ht) -{ - struct lttng_consumer_channel *free_chan = NULL; - - assert(stream); - /* - * This call should NEVER receive regular stream. It must always be - * metadata stream and this is crucial for data structure synchronization. - */ - assert(stream->metadata_flag); - - DBG3("Consumer delete metadata stream %d", stream->wait_fd); - - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&stream->chan->lock); - pthread_mutex_lock(&stream->lock); - - /* Remove any reference to that stream. */ - consumer_stream_delete(stream, ht); - - /* Close down everything including the relayd if one. */ - consumer_stream_close(stream); - /* Destroy tracer buffers of the stream. */ - consumer_stream_destroy_buffers(stream); - - /* Atomically decrement channel refcount since other threads can use it. */ - if (!uatomic_sub_return(&stream->chan->refcount, 1) - && !uatomic_read(&stream->chan->nb_init_stream_left)) { - /* Go for channel deletion! */ - free_chan = stream->chan; - } - - /* - * Nullify the stream reference so it is not used after deletion. The - * channel lock MUST be acquired before being able to check for a NULL - * pointer value. - */ - stream->chan->metadata_stream = NULL; - - pthread_mutex_unlock(&stream->lock); - pthread_mutex_unlock(&stream->chan->lock); - pthread_mutex_unlock(&consumer_data.lock); - - if (free_chan) { - consumer_del_channel(free_chan); - } - - consumer_stream_free(stream); -} - -/* - * Action done with the metadata stream when adding it to the consumer internal - * data structures to handle it. - */ -int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) -{ - struct lttng_ht *ht = metadata_ht; - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - - assert(stream); - assert(ht); - - DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); - - pthread_mutex_lock(&consumer_data.lock); - pthread_mutex_lock(&stream->chan->lock); - pthread_mutex_lock(&stream->chan->timer_lock); - pthread_mutex_lock(&stream->lock); - - /* - * From here, refcounts are updated so be _careful_ when returning an error - * after this point. - */ - - rcu_read_lock(); - - /* - * Lookup the stream just to make sure it does not exist in our internal - * state. This should NEVER happen. - */ - lttng_ht_lookup(ht, &stream->key, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - assert(!node); - - /* - * When nb_init_stream_left reaches 0, we don't need to trigger any action - * in terms of destroying the associated channel, because the action that - * causes the count to become 0 also causes a stream to be added. The - * channel deletion will thus be triggered by the following removal of this - * stream. - */ - if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { - /* Increment refcount before decrementing nb_init_stream_left */ - cmm_smp_wmb(); - uatomic_dec(&stream->chan->nb_init_stream_left); - } - - lttng_ht_add_unique_u64(ht, &stream->node); - - lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, - &stream->node_channel_id); - - /* - * Add stream to the stream_list_ht of the consumer data. No need to steal - * the key since the HT does not use it and we allow to add redundant keys - * into this table. - */ - lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); - - rcu_read_unlock(); - - pthread_mutex_unlock(&stream->lock); - pthread_mutex_unlock(&stream->chan->lock); - pthread_mutex_unlock(&stream->chan->timer_lock); - pthread_mutex_unlock(&consumer_data.lock); - return ret; -} - -/* - * Delete data stream that are flagged for deletion (endpoint_status). - */ -static void validate_endpoint_status_data_stream(void) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - DBG("Consumer delete flagged data stream"); - - rcu_read_lock(); - cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { - /* Validate delete flag of the stream */ - if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { - continue; - } - /* Delete it right now */ - consumer_del_stream(stream, data_ht); - } - rcu_read_unlock(); -} - -/* - * Delete metadata stream that are flagged for deletion (endpoint_status). - */ -static void validate_endpoint_status_metadata_stream( - struct lttng_poll_event *pollset) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_stream *stream; - - DBG("Consumer delete flagged metadata stream"); - - assert(pollset); - - rcu_read_lock(); - cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { - /* Validate delete flag of the stream */ - if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { - continue; - } - /* - * Remove from pollset so the metadata thread can continue without - * blocking on a deleted stream. - */ - lttng_poll_del(pollset, stream->wait_fd); - - /* Delete it right now */ - consumer_del_metadata_stream(stream, metadata_ht); - } - rcu_read_unlock(); -} - -/* - * Thread polls on metadata file descriptor and write them on disk or on the - * network. - */ -void *consumer_thread_metadata_poll(void *data) -{ - int ret, i, pollfd, err = -1; - uint32_t revents, nb_fd; - struct lttng_consumer_stream *stream = NULL; - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct lttng_poll_event events; - struct lttng_consumer_local_data *ctx = data; - ssize_t len; - - rcu_register_thread(); - - health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); - - if (testpoint(consumerd_thread_metadata)) { - goto error_testpoint; - } - - health_code_update(); - - DBG("Thread metadata poll started"); - - /* Size is set to 1 for the consumer_metadata pipe */ - ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); - if (ret < 0) { - ERR("Poll set creation failed"); - goto end_poll; - } - - ret = lttng_poll_add(&events, - lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); - if (ret < 0) { - goto end; - } - - /* Main loop */ - DBG("Metadata main loop started"); - - while (1) { -restart: - health_code_update(); - health_poll_entry(); - DBG("Metadata poll wait"); - ret = lttng_poll_wait(&events, -1); - DBG("Metadata poll return from wait with %d fd(s)", - LTTNG_POLL_GETNB(&events)); - health_poll_exit(); - DBG("Metadata event catched in thread"); - if (ret < 0) { - if (errno == EINTR) { - ERR("Poll EINTR catched"); - goto restart; - } - if (LTTNG_POLL_GETNB(&events) == 0) { - err = 0; /* All is OK */ - } - goto end; - } - - nb_fd = ret; - - /* From here, the event is a metadata wait fd */ - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); - - if (!revents) { - /* No activity for this FD (poll implementation). */ - continue; - } - - if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { - if (revents & LPOLLIN) { - ssize_t pipe_len; - - pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, - &stream, sizeof(stream)); - if (pipe_len < sizeof(stream)) { - if (pipe_len < 0) { - PERROR("read metadata stream"); - } - /* - * Remove the pipe from the poll set and continue the loop - * since their might be data to consume. - */ - lttng_poll_del(&events, - lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); - lttng_pipe_read_close(ctx->consumer_metadata_pipe); - continue; - } - - /* A NULL stream means that the state has changed. */ - if (stream == NULL) { - /* Check for deleted streams. */ - validate_endpoint_status_metadata_stream(&events); - goto restart; - } - - DBG("Adding metadata stream %d to poll set", - stream->wait_fd); - - /* Add metadata stream to the global poll events list */ - lttng_poll_add(&events, stream->wait_fd, - LPOLLIN | LPOLLPRI | LPOLLHUP); - } else if (revents & (LPOLLERR | LPOLLHUP)) { - DBG("Metadata thread pipe hung up"); - /* - * Remove the pipe from the poll set and continue the loop - * since their might be data to consume. - */ - lttng_poll_del(&events, - lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); - lttng_pipe_read_close(ctx->consumer_metadata_pipe); - continue; - } else { - ERR("Unexpected poll events %u for sock %d", revents, pollfd); - goto end; - } - - /* Handle other stream */ - continue; - } - - rcu_read_lock(); - { - uint64_t tmp_id = (uint64_t) pollfd; - - lttng_ht_lookup(metadata_ht, &tmp_id, &iter); - } - node = lttng_ht_iter_get_node_u64(&iter); - assert(node); - - stream = caa_container_of(node, struct lttng_consumer_stream, - node); - - if (revents & (LPOLLIN | LPOLLPRI)) { - /* Get the data out of the metadata file descriptor */ - DBG("Metadata available on fd %d", pollfd); - assert(stream->wait_fd == pollfd); - - do { - health_code_update(); - - len = ctx->on_buffer_ready(stream, ctx); - /* - * We don't check the return value here since if we get - * a negative len, it means an error occured thus we - * simply remove it from the poll set and free the - * stream. - */ - } while (len > 0); - - /* It's ok to have an unavailable sub-buffer */ - if (len < 0 && len != -EAGAIN && len != -ENODATA) { - /* Clean up stream from consumer and free it. */ - lttng_poll_del(&events, stream->wait_fd); - consumer_del_metadata_stream(stream, metadata_ht); - } - } else if (revents & (LPOLLERR | LPOLLHUP)) { - DBG("Metadata fd %d is hup|err.", pollfd); - if (!stream->hangup_flush_done - && (consumer_data.type == LTTNG_CONSUMER32_UST - || consumer_data.type == LTTNG_CONSUMER64_UST)) { - DBG("Attempting to flush and consume the UST buffers"); - lttng_ustconsumer_on_stream_hangup(stream); - - /* We just flushed the stream now read it. */ - do { - health_code_update(); - - len = ctx->on_buffer_ready(stream, ctx); - /* - * We don't check the return value here since if we get - * a negative len, it means an error occured thus we - * simply remove it from the poll set and free the - * stream. - */ - } while (len > 0); - } - - lttng_poll_del(&events, stream->wait_fd); - /* - * This call update the channel states, closes file descriptors - * and securely free the stream. - */ - consumer_del_metadata_stream(stream, metadata_ht); - } else { - ERR("Unexpected poll events %u for sock %d", revents, pollfd); - rcu_read_unlock(); - goto end; - } - /* Release RCU lock for the stream looked up */ - rcu_read_unlock(); - } - } - - /* All is OK */ - err = 0; -end: - DBG("Metadata poll thread exiting"); - - lttng_poll_clean(&events); -end_poll: -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_consumerd); - rcu_unregister_thread(); - return NULL; -} - -/* - * This thread polls the fds in the set to consume the data and write - * it to tracefile if necessary. - */ -void *consumer_thread_data_poll(void *data) -{ - int num_rdy, num_hup, high_prio, ret, i, err = -1; - struct pollfd *pollfd = NULL; - /* local view of the streams */ - struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; - /* local view of consumer_data.fds_count */ - int nb_fd = 0; - struct lttng_consumer_local_data *ctx = data; - ssize_t len; - - rcu_register_thread(); - - health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); - - if (testpoint(consumerd_thread_data)) { - goto error_testpoint; - } - - health_code_update(); - - local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); - if (local_stream == NULL) { - PERROR("local_stream malloc"); - goto end; - } - - while (1) { - health_code_update(); - - high_prio = 0; - num_hup = 0; - - /* - * the fds set has been updated, we need to update our - * local array as well - */ - pthread_mutex_lock(&consumer_data.lock); - if (consumer_data.need_update) { - free(pollfd); - pollfd = NULL; - - free(local_stream); - local_stream = NULL; - - /* - * Allocate for all fds +1 for the consumer_data_pipe and +1 for - * wake up pipe. - */ - pollfd = zmalloc((consumer_data.stream_count + 2) * sizeof(struct pollfd)); - if (pollfd == NULL) { - PERROR("pollfd malloc"); - pthread_mutex_unlock(&consumer_data.lock); - goto end; - } - - local_stream = zmalloc((consumer_data.stream_count + 2) * - sizeof(struct lttng_consumer_stream *)); - if (local_stream == NULL) { - PERROR("local_stream malloc"); - pthread_mutex_unlock(&consumer_data.lock); - goto end; - } - ret = update_poll_array(ctx, &pollfd, local_stream, - data_ht); - if (ret < 0) { - ERR("Error in allocating pollfd or local_outfds"); - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); - pthread_mutex_unlock(&consumer_data.lock); - goto end; - } - nb_fd = ret; - consumer_data.need_update = 0; - } - pthread_mutex_unlock(&consumer_data.lock); - - /* No FDs and consumer_quit, consumer_cleanup the thread */ - if (nb_fd == 0 && consumer_quit == 1) { - err = 0; /* All is OK */ - goto end; - } - /* poll on the array of fds */ - restart: - DBG("polling on %d fd", nb_fd + 2); - health_poll_entry(); - num_rdy = poll(pollfd, nb_fd + 2, -1); - health_poll_exit(); - DBG("poll num_rdy : %d", num_rdy); - if (num_rdy == -1) { - /* - * Restart interrupted system call. - */ - if (errno == EINTR) { - goto restart; - } - PERROR("Poll error"); - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); - goto end; - } else if (num_rdy == 0) { - DBG("Polling thread timed out"); - goto end; - } - - /* - * If the consumer_data_pipe triggered poll go directly to the - * beginning of the loop to update the array. We want to prioritize - * array update over low-priority reads. - */ - if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { - ssize_t pipe_readlen; - - DBG("consumer_data_pipe wake up"); - pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, - &new_stream, sizeof(new_stream)); - if (pipe_readlen < sizeof(new_stream)) { - PERROR("Consumer data pipe"); - /* Continue so we can at least handle the current stream(s). */ - continue; - } - - /* - * If the stream is NULL, just ignore it. It's also possible that - * the sessiond poll thread changed the consumer_quit state and is - * waking us up to test it. - */ - if (new_stream == NULL) { - validate_endpoint_status_data_stream(); - continue; - } - - /* Continue to update the local streams and handle prio ones */ - continue; - } - - /* Handle wakeup pipe. */ - if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { - char dummy; - ssize_t pipe_readlen; - - pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, - sizeof(dummy)); - if (pipe_readlen < 0) { - PERROR("Consumer data wakeup pipe"); - } - /* We've been awakened to handle stream(s). */ - ctx->has_wakeup = 0; - } - - /* Take care of high priority channels first. */ - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - if (local_stream[i] == NULL) { - continue; - } - if (pollfd[i].revents & POLLPRI) { - DBG("Urgent read on fd %d", pollfd[i].fd); - high_prio = 1; - len = ctx->on_buffer_ready(local_stream[i], ctx); - /* it's ok to have an unavailable sub-buffer */ - if (len < 0 && len != -EAGAIN && len != -ENODATA) { - /* Clean the stream and free it. */ - consumer_del_stream(local_stream[i], data_ht); - local_stream[i] = NULL; - } else if (len > 0) { - local_stream[i]->data_read = 1; - } - } - } - - /* - * If we read high prio channel in this loop, try again - * for more high prio data. - */ - if (high_prio) { - continue; - } - - /* Take care of low priority channels. */ - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - if (local_stream[i] == NULL) { - continue; - } - if ((pollfd[i].revents & POLLIN) || - local_stream[i]->hangup_flush_done || - local_stream[i]->has_data) { - DBG("Normal read on fd %d", pollfd[i].fd); - len = ctx->on_buffer_ready(local_stream[i], ctx); - /* it's ok to have an unavailable sub-buffer */ - if (len < 0 && len != -EAGAIN && len != -ENODATA) { - /* Clean the stream and free it. */ - consumer_del_stream(local_stream[i], data_ht); - local_stream[i] = NULL; - } else if (len > 0) { - local_stream[i]->data_read = 1; - } - } - } - - /* Handle hangup and errors */ - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - if (local_stream[i] == NULL) { - continue; - } - if (!local_stream[i]->hangup_flush_done - && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) - && (consumer_data.type == LTTNG_CONSUMER32_UST - || consumer_data.type == LTTNG_CONSUMER64_UST)) { - DBG("fd %d is hup|err|nval. Attempting flush and read.", - pollfd[i].fd); - lttng_ustconsumer_on_stream_hangup(local_stream[i]); - /* Attempt read again, for the data we just flushed. */ - local_stream[i]->data_read = 1; - } - /* - * If the poll flag is HUP/ERR/NVAL and we have - * read no data in this pass, we can remove the - * stream from its hash table. - */ - if ((pollfd[i].revents & POLLHUP)) { - DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); - if (!local_stream[i]->data_read) { - consumer_del_stream(local_stream[i], data_ht); - local_stream[i] = NULL; - num_hup++; - } - } else if (pollfd[i].revents & POLLERR) { - ERR("Error returned in polling fd %d.", pollfd[i].fd); - if (!local_stream[i]->data_read) { - consumer_del_stream(local_stream[i], data_ht); - local_stream[i] = NULL; - num_hup++; - } - } else if (pollfd[i].revents & POLLNVAL) { - ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); - if (!local_stream[i]->data_read) { - consumer_del_stream(local_stream[i], data_ht); - local_stream[i] = NULL; - num_hup++; - } - } - if (local_stream[i] != NULL) { - local_stream[i]->data_read = 0; - } - } - } - /* All is OK */ - err = 0; -end: - DBG("polling thread exiting"); - free(pollfd); - free(local_stream); - - /* - * Close the write side of the pipe so epoll_wait() in - * consumer_thread_metadata_poll can catch it. The thread is monitoring the - * read side of the pipe. If we close them both, epoll_wait strangely does - * not return and could create a endless wait period if the pipe is the - * only tracked fd in the poll set. The thread will take care of closing - * the read side. - */ - (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); - -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_consumerd); - - rcu_unregister_thread(); - return NULL; -} - -/* - * Close wake-up end of each stream belonging to the channel. This will - * allow the poll() on the stream read-side to detect when the - * write-side (application) finally closes them. - */ -static -void consumer_close_channel_streams(struct lttng_consumer_channel *channel) -{ - struct lttng_ht *ht; - struct lttng_consumer_stream *stream; - struct lttng_ht_iter iter; - - ht = consumer_data.stream_per_chan_id_ht; - - rcu_read_lock(); - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&channel->key, lttng_ht_seed), - ht->match_fct, &channel->key, - &iter.iter, stream, node_channel_id.node) { - /* - * Protect against teardown with mutex. - */ - pthread_mutex_lock(&stream->lock); - if (cds_lfht_is_node_deleted(&stream->node.node)) { - goto next; - } - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - if (stream->metadata_flag) { - /* Safe and protected by the stream lock. */ - lttng_ustconsumer_close_metadata(stream->chan); - } else { - /* - * Note: a mutex is taken internally within - * liblttng-ust-ctl to protect timer wakeup_fd - * use from concurrent close. - */ - lttng_ustconsumer_close_stream_wakeup(stream); - } - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - } - next: - pthread_mutex_unlock(&stream->lock); - } - rcu_read_unlock(); -} - -static void destroy_channel_ht(struct lttng_ht *ht) -{ - struct lttng_ht_iter iter; - struct lttng_consumer_channel *channel; - int ret; - - if (ht == NULL) { - return; - } - - rcu_read_lock(); - cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { - ret = lttng_ht_del(ht, &iter); - assert(ret != 0); - } - rcu_read_unlock(); - - lttng_ht_destroy(ht); -} - -/* - * This thread polls the channel fds to detect when they are being - * closed. It closes all related streams if the channel is detected as - * closed. It is currently only used as a shim layer for UST because the - * consumerd needs to keep the per-stream wakeup end of pipes open for - * periodical flush. - */ -void *consumer_thread_channel_poll(void *data) -{ - int ret, i, pollfd, err = -1; - uint32_t revents, nb_fd; - struct lttng_consumer_channel *chan = NULL; - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct lttng_poll_event events; - struct lttng_consumer_local_data *ctx = data; - struct lttng_ht *channel_ht; - - rcu_register_thread(); - - health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); - - if (testpoint(consumerd_thread_channel)) { - goto error_testpoint; - } - - health_code_update(); - - channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!channel_ht) { - /* ENOMEM at this point. Better to bail out. */ - goto end_ht; - } - - DBG("Thread channel poll started"); - - /* Size is set to 1 for the consumer_channel pipe */ - ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); - if (ret < 0) { - ERR("Poll set creation failed"); - goto end_poll; - } - - ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); - if (ret < 0) { - goto end; - } - - /* Main loop */ - DBG("Channel main loop started"); - - while (1) { -restart: - health_code_update(); - DBG("Channel poll wait"); - health_poll_entry(); - ret = lttng_poll_wait(&events, -1); - DBG("Channel poll return from wait with %d fd(s)", - LTTNG_POLL_GETNB(&events)); - health_poll_exit(); - DBG("Channel event catched in thread"); - if (ret < 0) { - if (errno == EINTR) { - ERR("Poll EINTR catched"); - goto restart; - } - if (LTTNG_POLL_GETNB(&events) == 0) { - err = 0; /* All is OK */ - } - goto end; - } - - nb_fd = ret; - - /* From here, the event is a channel wait fd */ - for (i = 0; i < nb_fd; i++) { - health_code_update(); - - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); - - if (!revents) { - /* No activity for this FD (poll implementation). */ - continue; - } - - if (pollfd == ctx->consumer_channel_pipe[0]) { - if (revents & LPOLLIN) { - enum consumer_channel_action action; - uint64_t key; - - ret = read_channel_pipe(ctx, &chan, &key, &action); - if (ret <= 0) { - if (ret < 0) { - ERR("Error reading channel pipe"); - } - lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); - continue; - } - - switch (action) { - case CONSUMER_CHANNEL_ADD: - DBG("Adding channel %d to poll set", - chan->wait_fd); - - lttng_ht_node_init_u64(&chan->wait_fd_node, - chan->wait_fd); - rcu_read_lock(); - lttng_ht_add_unique_u64(channel_ht, - &chan->wait_fd_node); - rcu_read_unlock(); - /* Add channel to the global poll events list */ - lttng_poll_add(&events, chan->wait_fd, - LPOLLERR | LPOLLHUP); - break; - case CONSUMER_CHANNEL_DEL: - { - /* - * This command should never be called if the channel - * has streams monitored by either the data or metadata - * thread. The consumer only notify this thread with a - * channel del. command if it receives a destroy - * channel command from the session daemon that send it - * if a command prior to the GET_CHANNEL failed. - */ - - rcu_read_lock(); - chan = consumer_find_channel(key); - if (!chan) { - rcu_read_unlock(); - ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); - break; - } - lttng_poll_del(&events, chan->wait_fd); - iter.iter.node = &chan->wait_fd_node.node; - ret = lttng_ht_del(channel_ht, &iter); - assert(ret == 0); - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - health_code_update(); - /* Destroy streams that might have been left in the stream list. */ - clean_channel_stream_list(chan); - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - } - - /* - * Release our own refcount. Force channel deletion even if - * streams were not initialized. - */ - if (!uatomic_sub_return(&chan->refcount, 1)) { - consumer_del_channel(chan); - } - rcu_read_unlock(); - goto restart; - } - case CONSUMER_CHANNEL_QUIT: - /* - * Remove the pipe from the poll set and continue the loop - * since their might be data to consume. - */ - lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); - continue; - default: - ERR("Unknown action"); - break; - } - } else if (revents & (LPOLLERR | LPOLLHUP)) { - DBG("Channel thread pipe hung up"); - /* - * Remove the pipe from the poll set and continue the loop - * since their might be data to consume. - */ - lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); - continue; - } else { - ERR("Unexpected poll events %u for sock %d", revents, pollfd); - goto end; - } - - /* Handle other stream */ - continue; - } - - rcu_read_lock(); - { - uint64_t tmp_id = (uint64_t) pollfd; - - lttng_ht_lookup(channel_ht, &tmp_id, &iter); - } - node = lttng_ht_iter_get_node_u64(&iter); - assert(node); - - chan = caa_container_of(node, struct lttng_consumer_channel, - wait_fd_node); - - /* Check for error event */ - if (revents & (LPOLLERR | LPOLLHUP)) { - DBG("Channel fd %d is hup|err.", pollfd); - - lttng_poll_del(&events, chan->wait_fd); - ret = lttng_ht_del(channel_ht, &iter); - assert(ret == 0); - - /* - * This will close the wait fd for each stream associated to - * this channel AND monitored by the data/metadata thread thus - * will be clean by the right thread. - */ - consumer_close_channel_streams(chan); - - /* Release our own refcount */ - if (!uatomic_sub_return(&chan->refcount, 1) - && !uatomic_read(&chan->nb_init_stream_left)) { - consumer_del_channel(chan); - } - } else { - ERR("Unexpected poll events %u for sock %d", revents, pollfd); - rcu_read_unlock(); - goto end; - } - - /* Release RCU lock for the channel looked up */ - rcu_read_unlock(); - } - } - - /* All is OK */ - err = 0; -end: - lttng_poll_clean(&events); -end_poll: - destroy_channel_ht(channel_ht); -end_ht: -error_testpoint: - DBG("Channel poll thread exiting"); - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_consumerd); - rcu_unregister_thread(); - return NULL; -} - -static int set_metadata_socket(struct lttng_consumer_local_data *ctx, - struct pollfd *sockpoll, int client_socket) -{ - int ret; - - assert(ctx); - assert(sockpoll); - - ret = lttng_consumer_poll_socket(sockpoll); - if (ret) { - goto error; - } - DBG("Metadata connection on client_socket"); - - /* Blocking call, waiting for transmission */ - ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); - if (ctx->consumer_metadata_socket < 0) { - WARN("On accept metadata"); - ret = -1; - goto error; - } - ret = 0; - -error: - return ret; -} - -/* - * This thread listens on the consumerd socket and receives the file - * descriptors from the session daemon. - */ -void *consumer_thread_sessiond_poll(void *data) -{ - int sock = -1, client_socket, ret, err = -1; - /* - * structure to poll for incoming data on communication socket avoids - * making blocking sockets. - */ - struct pollfd consumer_sockpoll[2]; - struct lttng_consumer_local_data *ctx = data; - - rcu_register_thread(); - - health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); - - if (testpoint(consumerd_thread_sessiond)) { - goto error_testpoint; - } - - health_code_update(); - - DBG("Creating command socket %s", ctx->consumer_command_sock_path); - unlink(ctx->consumer_command_sock_path); - client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); - if (client_socket < 0) { - ERR("Cannot create command socket"); - goto end; - } - - ret = lttcomm_listen_unix_sock(client_socket); - if (ret < 0) { - goto end; - } - - DBG("Sending ready command to lttng-sessiond"); - ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); - /* return < 0 on error, but == 0 is not fatal */ - if (ret < 0) { - ERR("Error sending ready command to lttng-sessiond"); - goto end; - } - - /* prepare the FDs to poll : to client socket and the should_quit pipe */ - consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; - consumer_sockpoll[0].events = POLLIN | POLLPRI; - consumer_sockpoll[1].fd = client_socket; - consumer_sockpoll[1].events = POLLIN | POLLPRI; - - ret = lttng_consumer_poll_socket(consumer_sockpoll); - if (ret) { - if (ret > 0) { - /* should exit */ - err = 0; - } - goto end; - } - DBG("Connection on client_socket"); - - /* Blocking call, waiting for transmission */ - sock = lttcomm_accept_unix_sock(client_socket); - if (sock < 0) { - WARN("On accept"); - goto end; - } - - /* - * Setup metadata socket which is the second socket connection on the - * command unix socket. - */ - ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); - if (ret) { - if (ret > 0) { - /* should exit */ - err = 0; - } - goto end; - } - - /* This socket is not useful anymore. */ - ret = close(client_socket); - if (ret < 0) { - PERROR("close client_socket"); - } - client_socket = -1; - - /* update the polling structure to poll on the established socket */ - consumer_sockpoll[1].fd = sock; - consumer_sockpoll[1].events = POLLIN | POLLPRI; - - while (1) { - health_code_update(); - - health_poll_entry(); - ret = lttng_consumer_poll_socket(consumer_sockpoll); - health_poll_exit(); - if (ret) { - if (ret > 0) { - /* should exit */ - err = 0; - } - goto end; - } - DBG("Incoming command on sock"); - ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); - if (ret <= 0) { - /* - * This could simply be a session daemon quitting. Don't output - * ERR() here. - */ - DBG("Communication interrupted on command socket"); - err = 0; - goto end; - } - if (consumer_quit) { - DBG("consumer_thread_receive_fds received quit from signal"); - err = 0; /* All is OK */ - goto end; - } - DBG("received command on sock"); - } - /* All is OK */ - err = 0; - -end: - DBG("Consumer thread sessiond poll exiting"); - - /* - * Close metadata streams since the producer is the session daemon which - * just died. - * - * NOTE: for now, this only applies to the UST tracer. - */ - lttng_consumer_close_all_metadata(); - - /* - * when all fds have hung up, the polling thread - * can exit cleanly - */ - consumer_quit = 1; - - /* - * Notify the data poll thread to poll back again and test the - * consumer_quit state that we just set so to quit gracefully. - */ - notify_thread_lttng_pipe(ctx->consumer_data_pipe); - - notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); - - notify_health_quit_pipe(health_quit_pipe); - - /* Cleaning up possibly open sockets. */ - if (sock >= 0) { - ret = close(sock); - if (ret < 0) { - PERROR("close sock sessiond poll"); - } - } - if (client_socket >= 0) { - ret = close(client_socket); - if (ret < 0) { - PERROR("close client_socket sessiond poll"); - } - } - -error_testpoint: - if (err) { - health_error(); - ERR("Health error occurred in %s", __func__); - } - health_unregister(health_consumerd); - - rcu_unregister_thread(); - return NULL; -} - -ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, - struct lttng_consumer_local_data *ctx) -{ - ssize_t ret; - - pthread_mutex_lock(&stream->lock); - if (stream->metadata_flag) { - pthread_mutex_lock(&stream->metadata_rdv_lock); - } - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - ret = lttng_kconsumer_read_subbuffer(stream, ctx); - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - ret = lttng_ustconsumer_read_subbuffer(stream, ctx); - break; - default: - ERR("Unknown consumer_data type"); - assert(0); - ret = -ENOSYS; - break; - } - - if (stream->metadata_flag) { - pthread_cond_broadcast(&stream->metadata_rdv); - pthread_mutex_unlock(&stream->metadata_rdv_lock); - } - pthread_mutex_unlock(&stream->lock); - return ret; -} - -int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) -{ - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - return lttng_kconsumer_on_recv_stream(stream); - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - return lttng_ustconsumer_on_recv_stream(stream); - default: - ERR("Unknown consumer_data type"); - assert(0); - return -ENOSYS; - } -} - -/* - * Allocate and set consumer data hash tables. - */ -int lttng_consumer_init(void) -{ - consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!consumer_data.channel_ht) { - goto error; - } - - consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!consumer_data.relayd_ht) { - goto error; - } - - consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!consumer_data.stream_list_ht) { - goto error; - } - - consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!consumer_data.stream_per_chan_id_ht) { - goto error; - } - - data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!data_ht) { - goto error; - } - - metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - if (!metadata_ht) { - goto error; - } - - return 0; - -error: - return -1; -} - -/* - * Process the ADD_RELAYD command receive by a consumer. - * - * This will create a relayd socket pair and add it to the relayd hash table. - * The caller MUST acquire a RCU read side lock before calling it. - */ -int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, - struct lttng_consumer_local_data *ctx, int sock, - struct pollfd *consumer_sockpoll, - struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, - uint64_t relayd_session_id) -{ - int fd = -1, ret = -1, relayd_created = 0; - enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; - struct consumer_relayd_sock_pair *relayd = NULL; - - assert(ctx); - assert(relayd_sock); - - DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); - - /* Get relayd reference if exists. */ - relayd = consumer_find_relayd(net_seq_idx); - if (relayd == NULL) { - assert(sock_type == LTTNG_STREAM_CONTROL); - /* Not found. Allocate one. */ - relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); - if (relayd == NULL) { - ret = -ENOMEM; - ret_code = LTTCOMM_CONSUMERD_ENOMEM; - goto error; - } else { - relayd->sessiond_session_id = sessiond_id; - relayd_created = 1; - } - - /* - * This code path MUST continue to the consumer send status message to - * we can notify the session daemon and continue our work without - * killing everything. - */ - } else { - /* - * relayd key should never be found for control socket. - */ - assert(sock_type != LTTNG_STREAM_CONTROL); - } - - /* First send a status message before receiving the fds. */ - ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); - if (ret < 0) { - /* Somehow, the session daemon is not responding anymore. */ - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); - goto error_nosignal; - } - - /* Poll on consumer socket. */ - ret = lttng_consumer_poll_socket(consumer_sockpoll); - if (ret) { - /* Needing to exit in the middle of a command: error. */ - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); - ret = -EINTR; - goto error_nosignal; - } - - /* Get relayd socket from session daemon */ - ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); - if (ret != sizeof(fd)) { - ret = -1; - fd = -1; /* Just in case it gets set with an invalid value. */ - - /* - * Failing to receive FDs might indicate a major problem such as - * reaching a fd limit during the receive where the kernel returns a - * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we - * don't take any chances and stop everything. - * - * XXX: Feature request #558 will fix that and avoid this possible - * issue when reaching the fd limit. - */ - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); - ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; - goto error; - } - - /* Copy socket information and received FD */ - switch (sock_type) { - case LTTNG_STREAM_CONTROL: - /* Copy received lttcomm socket */ - lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); - ret = lttcomm_create_sock(&relayd->control_sock.sock); - /* Handle create_sock error. */ - if (ret < 0) { - ret_code = LTTCOMM_CONSUMERD_ENOMEM; - goto error; - } - /* - * Close the socket created internally by - * lttcomm_create_sock, so we can replace it by the one - * received from sessiond. - */ - if (close(relayd->control_sock.sock.fd)) { - PERROR("close"); - } - - /* Assign new file descriptor */ - relayd->control_sock.sock.fd = fd; - fd = -1; /* For error path */ - /* Assign version values. */ - relayd->control_sock.major = relayd_sock->major; - relayd->control_sock.minor = relayd_sock->minor; - - relayd->relayd_session_id = relayd_session_id; - - break; - case LTTNG_STREAM_DATA: - /* Copy received lttcomm socket */ - lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); - ret = lttcomm_create_sock(&relayd->data_sock.sock); - /* Handle create_sock error. */ - if (ret < 0) { - ret_code = LTTCOMM_CONSUMERD_ENOMEM; - goto error; - } - /* - * Close the socket created internally by - * lttcomm_create_sock, so we can replace it by the one - * received from sessiond. - */ - if (close(relayd->data_sock.sock.fd)) { - PERROR("close"); - } - - /* Assign new file descriptor */ - relayd->data_sock.sock.fd = fd; - fd = -1; /* for eventual error paths */ - /* Assign version values. */ - relayd->data_sock.major = relayd_sock->major; - relayd->data_sock.minor = relayd_sock->minor; - break; - default: - ERR("Unknown relayd socket type (%d)", sock_type); - ret = -1; - ret_code = LTTCOMM_CONSUMERD_FATAL; - goto error; - } - - DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", - sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", - relayd->net_seq_idx, fd); - - /* We successfully added the socket. Send status back. */ - ret = consumer_send_status_msg(sock, ret_code); - if (ret < 0) { - /* Somehow, the session daemon is not responding anymore. */ - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); - goto error_nosignal; - } - - /* - * Add relayd socket pair to consumer data hashtable. If object already - * exists or on error, the function gracefully returns. - */ - add_relayd(relayd); - - /* All good! */ - return 0; - -error: - if (consumer_send_status_msg(sock, ret_code) < 0) { - lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); - } - -error_nosignal: - /* Close received socket if valid. */ - if (fd >= 0) { - if (close(fd)) { - PERROR("close received socket"); - } - } - - if (relayd_created) { - free(relayd); - } - - return ret; -} - -/* - * Try to lock the stream mutex. - * - * On success, 1 is returned else 0 indicating that the mutex is NOT lock. - */ -static int stream_try_lock(struct lttng_consumer_stream *stream) -{ - int ret; - - assert(stream); - - /* - * Try to lock the stream mutex. On failure, we know that the stream is - * being used else where hence there is data still being extracted. - */ - ret = pthread_mutex_trylock(&stream->lock); - if (ret) { - /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ - ret = 0; - goto end; - } - - ret = 1; - -end: - return ret; -} - -/* - * Search for a relayd associated to the session id and return the reference. - * - * A rcu read side lock MUST be acquire before calling this function and locked - * until the relayd object is no longer necessary. - */ -static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) -{ - struct lttng_ht_iter iter; - struct consumer_relayd_sock_pair *relayd = NULL; - - /* Iterate over all relayd since they are indexed by net_seq_idx. */ - cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, - node.node) { - /* - * Check by sessiond id which is unique here where the relayd session - * id might not be when having multiple relayd. - */ - if (relayd->sessiond_session_id == id) { - /* Found the relayd. There can be only one per id. */ - goto found; - } - } - - return NULL; - -found: - return relayd; -} - -/* - * Check if for a given session id there is still data needed to be extract - * from the buffers. - * - * Return 1 if data is pending or else 0 meaning ready to be read. - */ -int consumer_data_pending(uint64_t id) -{ - int ret; - struct lttng_ht_iter iter; - struct lttng_ht *ht; - struct lttng_consumer_stream *stream; - struct consumer_relayd_sock_pair *relayd = NULL; - int (*data_pending)(struct lttng_consumer_stream *); - - DBG("Consumer data pending command on session id %" PRIu64, id); - - rcu_read_lock(); - pthread_mutex_lock(&consumer_data.lock); - - switch (consumer_data.type) { - case LTTNG_CONSUMER_KERNEL: - data_pending = lttng_kconsumer_data_pending; - break; - case LTTNG_CONSUMER32_UST: - case LTTNG_CONSUMER64_UST: - data_pending = lttng_ustconsumer_data_pending; - break; - default: - ERR("Unknown consumer data type"); - assert(0); - } - - /* Ease our life a bit */ - ht = consumer_data.stream_list_ht; - - relayd = find_relayd_by_session_id(id); - if (relayd) { - /* Send init command for data pending. */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_begin_data_pending(&relayd->control_sock, - relayd->relayd_session_id); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret < 0) { - /* Communication error thus the relayd so no data pending. */ - goto data_not_pending; - } - } - - cds_lfht_for_each_entry_duplicate(ht->ht, - ht->hash_fct(&id, lttng_ht_seed), - ht->match_fct, &id, - &iter.iter, stream, node_session_id.node) { - /* If this call fails, the stream is being used hence data pending. */ - ret = stream_try_lock(stream); - if (!ret) { - goto data_pending; - } - - /* - * A removed node from the hash table indicates that the stream has - * been deleted thus having a guarantee that the buffers are closed - * on the consumer side. However, data can still be transmitted - * over the network so don't skip the relayd check. - */ - ret = cds_lfht_is_node_deleted(&stream->node.node); - if (!ret) { - /* Check the stream if there is data in the buffers. */ - ret = data_pending(stream); - if (ret == 1) { - pthread_mutex_unlock(&stream->lock); - goto data_pending; - } - } - - /* Relayd check */ - if (relayd) { - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - if (stream->metadata_flag) { - ret = relayd_quiescent_control(&relayd->control_sock, - stream->relayd_stream_id); - } else { - ret = relayd_data_pending(&relayd->control_sock, - stream->relayd_stream_id, - stream->next_net_seq_num - 1); - } - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret == 1) { - pthread_mutex_unlock(&stream->lock); - goto data_pending; - } - } - pthread_mutex_unlock(&stream->lock); - } - - if (relayd) { - unsigned int is_data_inflight = 0; - - /* Send init command for data pending. */ - pthread_mutex_lock(&relayd->ctrl_sock_mutex); - ret = relayd_end_data_pending(&relayd->control_sock, - relayd->relayd_session_id, &is_data_inflight); - pthread_mutex_unlock(&relayd->ctrl_sock_mutex); - if (ret < 0) { - goto data_not_pending; - } - if (is_data_inflight) { - goto data_pending; - } - } - - /* - * Finding _no_ node in the hash table and no inflight data means that the - * stream(s) have been removed thus data is guaranteed to be available for - * analysis from the trace files. - */ - -data_not_pending: - /* Data is available to be read by a viewer. */ - pthread_mutex_unlock(&consumer_data.lock); - rcu_read_unlock(); - return 0; - -data_pending: - /* Data is still being extracted from buffers. */ - pthread_mutex_unlock(&consumer_data.lock); - rcu_read_unlock(); - return 1; -} - -/* - * Send a ret code status message to the sessiond daemon. - * - * Return the sendmsg() return value. - */ -int consumer_send_status_msg(int sock, int ret_code) -{ - struct lttcomm_consumer_status_msg msg; - - memset(&msg, 0, sizeof(msg)); - msg.ret_code = ret_code; - - return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); -} - -/* - * Send a channel status message to the sessiond daemon. - * - * Return the sendmsg() return value. - */ -int consumer_send_status_channel(int sock, - struct lttng_consumer_channel *channel) -{ - struct lttcomm_consumer_status_channel msg; - - assert(sock >= 0); - - memset(&msg, 0, sizeof(msg)); - if (!channel) { - msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; - } else { - msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; - msg.key = channel->key; - msg.stream_count = channel->streams.count; - } - - return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); -} - -unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, - unsigned long produced_pos, uint64_t nb_packets_per_stream, - uint64_t max_sb_size) -{ - unsigned long start_pos; - - if (!nb_packets_per_stream) { - return consumed_pos; /* Grab everything */ - } - start_pos = produced_pos - offset_align_floor(produced_pos, max_sb_size); - start_pos -= max_sb_size * nb_packets_per_stream; - if ((long) (start_pos - consumed_pos) < 0) { - return consumed_pos; /* Grab everything */ - } - return start_pos; -} diff --git a/src/common/consumer.h b/src/common/consumer.h deleted file mode 100644 index c7ef3fb38..000000000 --- a/src/common/consumer.h +++ /dev/null @@ -1,698 +0,0 @@ -/* - * Copyright (C) 2011 - Julien Desfossez - * Mathieu Desnoyers - * 2012 - David Goulet - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License, version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#ifndef LIB_CONSUMER_H -#define LIB_CONSUMER_H - -#include -#include -#include -#include - -#include - -#include -#include -#include -#include -#include -#include - -/* Commands for consumer */ -enum lttng_consumer_command { - LTTNG_CONSUMER_ADD_CHANNEL, - LTTNG_CONSUMER_ADD_STREAM, - /* pause, delete, active depending on fd state */ - LTTNG_CONSUMER_UPDATE_STREAM, - /* inform the consumer to quit when all fd has hang up */ - LTTNG_CONSUMER_STOP, /* deprecated */ - LTTNG_CONSUMER_ADD_RELAYD_SOCKET, - /* Inform the consumer to kill a specific relayd connection */ - LTTNG_CONSUMER_DESTROY_RELAYD, - /* Return to the sessiond if there is data pending for a session */ - LTTNG_CONSUMER_DATA_PENDING, - /* Consumer creates a channel and returns it to sessiond. */ - LTTNG_CONSUMER_ASK_CHANNEL_CREATION, - LTTNG_CONSUMER_GET_CHANNEL, - LTTNG_CONSUMER_DESTROY_CHANNEL, - LTTNG_CONSUMER_PUSH_METADATA, - LTTNG_CONSUMER_CLOSE_METADATA, - LTTNG_CONSUMER_SETUP_METADATA, - LTTNG_CONSUMER_FLUSH_CHANNEL, - LTTNG_CONSUMER_SNAPSHOT_CHANNEL, - LTTNG_CONSUMER_SNAPSHOT_METADATA, - LTTNG_CONSUMER_STREAMS_SENT, -}; - -/* State of each fd in consumer */ -enum lttng_consumer_stream_state { - LTTNG_CONSUMER_ACTIVE_STREAM, - LTTNG_CONSUMER_PAUSE_STREAM, - LTTNG_CONSUMER_DELETE_STREAM, -}; - -enum lttng_consumer_type { - LTTNG_CONSUMER_UNKNOWN = 0, - LTTNG_CONSUMER_KERNEL, - LTTNG_CONSUMER64_UST, - LTTNG_CONSUMER32_UST, -}; - -enum consumer_endpoint_status { - CONSUMER_ENDPOINT_ACTIVE, - CONSUMER_ENDPOINT_INACTIVE, -}; - -enum consumer_channel_output { - CONSUMER_CHANNEL_MMAP = 0, - CONSUMER_CHANNEL_SPLICE = 1, -}; - -enum consumer_channel_type { - CONSUMER_CHANNEL_TYPE_METADATA = 0, - CONSUMER_CHANNEL_TYPE_DATA = 1, -}; - -extern struct lttng_consumer_global_data consumer_data; - -struct stream_list { - struct cds_list_head head; - unsigned int count; -}; - -/* Stub. */ -struct consumer_metadata_cache; - -struct lttng_consumer_channel { - /* HT node used for consumer_data.channel_ht */ - struct lttng_ht_node_u64 node; - /* Indexed key. Incremented value in the consumer. */ - uint64_t key; - /* Number of streams referencing this channel */ - int refcount; - /* Tracing session id on the session daemon side. */ - uint64_t session_id; - /* - * Session id when requesting metadata to the session daemon for - * a session with per-PID buffers. - */ - uint64_t session_id_per_pid; - /* Channel trace file path name. */ - char pathname[PATH_MAX]; - /* Channel name. */ - char name[LTTNG_SYMBOL_NAME_LEN]; - /* UID and GID of the session owning this channel. */ - uid_t uid; - gid_t gid; - /* Relayd id of the channel. -1ULL if it does not apply. */ - uint64_t relayd_id; - /* - * Number of streams NOT initialized yet. This is used in order to not - * delete this channel if streams are getting initialized. - */ - unsigned int nb_init_stream_left; - /* Output type (mmap or splice). */ - enum consumer_channel_output output; - /* Channel type for stream */ - enum consumer_channel_type type; - - /* For UST */ - uid_t ust_app_uid; /* Application UID. */ - struct ustctl_consumer_channel *uchan; - unsigned char uuid[UUID_STR_LEN]; - /* - * Temporary stream list used to store the streams once created and waiting - * to be sent to the session daemon by receiving the - * LTTNG_CONSUMER_GET_CHANNEL. - */ - struct stream_list streams; - - /* - * Set if the channel is metadata. We keep a reference to the stream - * because we have to flush data once pushed by the session daemon. For a - * regular channel, this is always set to NULL. - */ - struct lttng_consumer_stream *metadata_stream; - - /* for UST */ - int wait_fd; - /* Node within channel thread ht */ - struct lttng_ht_node_u64 wait_fd_node; - - /* Metadata cache is metadata channel */ - struct consumer_metadata_cache *metadata_cache; - /* For UST metadata periodical flush */ - int switch_timer_enabled; - timer_t switch_timer; - int switch_timer_error; - - /* For the live mode */ - int live_timer_enabled; - timer_t live_timer; - int live_timer_error; - - /* On-disk circular buffer */ - uint64_t tracefile_size; - uint64_t tracefile_count; - /* - * Monitor or not the streams of this channel meaning this indicates if the - * streams should be sent to the data/metadata thread or added to the no - * monitor list of the channel. - */ - unsigned int monitor; - - /* - * Channel lock. - * - * This lock protects against concurrent update of channel. - * - * This is nested INSIDE the consumer data lock. - * This is nested OUTSIDE the channel timer lock. - * This is nested OUTSIDE the metadata cache lock. - * This is nested OUTSIDE stream lock. - * This is nested OUTSIDE consumer_relayd_sock_pair lock. - */ - pthread_mutex_t lock; - - /* - * Channel teardown lock. - * - * This lock protect against teardown of channel. It is _never_ - * taken by the timer handler. - * - * This is nested INSIDE the consumer data lock. - * This is nested INSIDE the channel lock. - * This is nested OUTSIDE the metadata cache lock. - * This is nested OUTSIDE stream lock. - * This is nested OUTSIDE consumer_relayd_sock_pair lock. - */ - pthread_mutex_t timer_lock; - - /* Timer value in usec for live streaming. */ - unsigned int live_timer_interval; - - int *stream_fds; - int nr_stream_fds; - char root_shm_path[PATH_MAX]; - char shm_path[PATH_MAX]; -}; - -/* - * Internal representation of the streams, sessiond_key is used to identify - * uniquely a stream. - */ -struct lttng_consumer_stream { - /* HT node used by the data_ht and metadata_ht */ - struct lttng_ht_node_u64 node; - /* stream indexed per channel key node */ - struct lttng_ht_node_u64 node_channel_id; - /* HT node used in consumer_data.stream_list_ht */ - struct lttng_ht_node_u64 node_session_id; - /* Pointer to associated channel. */ - struct lttng_consumer_channel *chan; - - /* Key by which the stream is indexed for 'node'. */ - uint64_t key; - /* - * File descriptor of the data output file. This can be either a file or a - * socket fd for relayd streaming. - */ - int out_fd; /* output file to write the data */ - /* Write position in the output file descriptor */ - off_t out_fd_offset; - /* Amount of bytes written to the output */ - uint64_t output_written; - enum lttng_consumer_stream_state state; - int shm_fd_is_copy; - int data_read; - int hangup_flush_done; - - /* - * metadata_timer_lock protects flags waiting_on_metadata and - * missed_metadata_flush. - */ - pthread_mutex_t metadata_timer_lock; - /* - * Flag set when awaiting metadata to be pushed. Used in the - * timer thread to skip waiting on the stream (and stream lock) to - * ensure we can proceed to flushing metadata in live mode. - */ - bool waiting_on_metadata; - /* Raised when a timer misses a metadata flush. */ - bool missed_metadata_flush; - - enum lttng_event_output output; - /* Maximum subbuffer size. */ - unsigned long max_sb_size; - - /* - * Still used by the kernel for MMAP output. For UST, the ustctl getter is - * used for the mmap base and offset. - */ - void *mmap_base; - unsigned long mmap_len; - - /* For UST */ - - int wait_fd; - /* UID/GID of the user owning the session to which stream belongs */ - uid_t uid; - gid_t gid; - /* Network sequence number. Indicating on which relayd socket it goes. */ - uint64_t net_seq_idx; - /* - * Indicate if this stream was successfully sent to a relayd. This is set - * after the refcount of the relayd is incremented and is checked when the - * stream is closed before decrementing the refcount in order to avoid an - * unbalanced state. - */ - unsigned int sent_to_relayd; - - /* Identify if the stream is the metadata */ - unsigned int metadata_flag; - /* Used when the stream is set for network streaming */ - uint64_t relayd_stream_id; - /* - * When sending a stream packet to a relayd, this number is used to track - * the packet sent by the consumer and seen by the relayd. When sending the - * data header to the relayd, this number is sent and if the transmission - * was successful, it is incremented. - * - * Even if the full data is not fully transmitted it won't matter since - * only two possible error can happen after that where either the relayd - * died or a read error is detected on the stream making this value useless - * after that. - * - * This value SHOULD be read/updated atomically or with the lock acquired. - */ - uint64_t next_net_seq_num; - /* - * Lock to use the stream FDs since they are used between threads. - * - * This is nested INSIDE the consumer_data lock. - * This is nested INSIDE the metadata cache lock. - * This is nested INSIDE the channel lock. - * This is nested INSIDE the channel timer lock. - * This is nested OUTSIDE consumer_relayd_sock_pair lock. - */ - pthread_mutex_t lock; - /* Tracing session id */ - uint64_t session_id; - /* - * Indicates if the stream end point is still active or not (network - * streaming or local file system). The thread "owning" the stream is - * handling this status and can be notified of a state change through the - * consumer data appropriate pipe. - */ - enum consumer_endpoint_status endpoint_status; - /* Stream name. Format is: _ */ - char name[LTTNG_SYMBOL_NAME_LEN]; - /* Internal state of libustctl. */ - struct ustctl_consumer_stream *ustream; - struct cds_list_head send_node; - /* On-disk circular buffer */ - uint64_t tracefile_size_current; - uint64_t tracefile_count_current; - /* - * Monitor or not the streams of this channel meaning this indicates if the - * streams should be sent to the data/metadata thread or added to the no - * monitor list of the channel. - */ - unsigned int monitor; - /* - * Indicate if the stream is globally visible meaning that it has been - * added to the multiple hash tables. If *not* set, NO lock should be - * acquired in the destroy path. - */ - unsigned int globally_visible; - /* - * Pipe to wake up the metadata poll thread when the UST metadata - * cache is updated. - */ - int ust_metadata_poll_pipe[2]; - /* - * How much metadata was read from the metadata cache and sent - * to the channel. - */ - uint64_t ust_metadata_pushed; - /* - * FD of the index file for this stream. - */ - int index_fd; - - /* - * Local pipe to extract data when using splice. - */ - int splice_pipe[2]; - - /* - * Rendez-vous point between data and metadata stream in live mode. - */ - pthread_cond_t metadata_rdv; - pthread_mutex_t metadata_rdv_lock; - - /* Indicate if the stream still has some data to be read. */ - unsigned int has_data:1; -}; - -/* - * Internal representation of a relayd socket pair. - */ -struct consumer_relayd_sock_pair { - /* Network sequence number. */ - uint64_t net_seq_idx; - /* Number of stream associated with this relayd */ - unsigned int refcount; - - /* - * This flag indicates whether or not we should destroy this object. The - * destruction should ONLY occurs when this flag is set and the refcount is - * set to zero. - */ - unsigned int destroy_flag; - - /* - * Mutex protecting the control socket to avoid out of order packets - * between threads sending data to the relayd. Since metadata data is sent - * over that socket, at least two sendmsg() are needed (header + data) - * creating a race for packets to overlap between threads using it. - * - * This is nested INSIDE the consumer_data lock. - * This is nested INSIDE the stream lock. - */ - pthread_mutex_t ctrl_sock_mutex; - - /* Control socket. Command and metadata are passed over it */ - struct lttcomm_relayd_sock control_sock; - - /* - * We don't need a mutex at this point since we only splice or write single - * large chunk of data with a header appended at the begining. Moreover, - * this socket is for now only used in a single thread. - */ - struct lttcomm_relayd_sock data_sock; - struct lttng_ht_node_u64 node; - - /* Session id on both sides for the sockets. */ - uint64_t relayd_session_id; - uint64_t sessiond_session_id; -}; - -/* - * UST consumer local data to the program. One or more instance per - * process. - */ -struct lttng_consumer_local_data { - /* - * Function to call when data is available on a buffer. - * Returns the number of bytes read, or negative error value. - */ - ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, - struct lttng_consumer_local_data *ctx); - /* - * function to call when we receive a new channel, it receives a - * newly allocated channel, depending on the return code of this - * function, the new channel will be handled by the application - * or the library. - * - * Returns: - * > 0 (success, FD is kept by application) - * == 0 (success, FD is left to library) - * < 0 (error) - */ - int (*on_recv_channel)(struct lttng_consumer_channel *channel); - /* - * function to call when we receive a new stream, it receives a - * newly allocated stream, depending on the return code of this - * function, the new stream will be handled by the application - * or the library. - * - * Returns: - * > 0 (success, FD is kept by application) - * == 0 (success, FD is left to library) - * < 0 (error) - */ - int (*on_recv_stream)(struct lttng_consumer_stream *stream); - /* - * function to call when a stream is getting updated by the session - * daemon, this function receives the sessiond key and the new - * state, depending on the return code of this function the - * update of state for the stream is handled by the application - * or the library. - * - * Returns: - * > 0 (success, FD is kept by application) - * == 0 (success, FD is left to library) - * < 0 (error) - */ - int (*on_update_stream)(uint64_t sessiond_key, uint32_t state); - enum lttng_consumer_type type; - /* socket to communicate errors with sessiond */ - int consumer_error_socket; - /* socket to ask metadata to sessiond. */ - int consumer_metadata_socket; - /* - * Protect consumer_metadata_socket. - * - * This is nested OUTSIDE the metadata cache lock. - */ - pthread_mutex_t metadata_socket_lock; - /* socket to exchange commands with sessiond */ - char *consumer_command_sock_path; - /* communication with splice */ - int consumer_channel_pipe[2]; - /* Data stream poll thread pipe. To transfer data stream to the thread */ - struct lttng_pipe *consumer_data_pipe; - - /* - * Data thread use that pipe to catch wakeup from read subbuffer that - * detects that there is still data to be read for the stream encountered. - * Before doing so, the stream is flagged to indicate that there is still - * data to be read. - * - * Both pipes (read/write) are owned and used inside the data thread. - */ - struct lttng_pipe *consumer_wakeup_pipe; - /* Indicate if the wakeup thread has been notified. */ - unsigned int has_wakeup:1; - - /* to let the signal handler wake up the fd receiver thread */ - int consumer_should_quit[2]; - /* Metadata poll thread pipe. Transfer metadata stream to it */ - struct lttng_pipe *consumer_metadata_pipe; -}; - -/* - * Library-level data. One instance per process. - */ -struct lttng_consumer_global_data { - /* - * At this time, this lock is used to ensure coherence between the count - * and number of element in the hash table. It's also a protection for - * concurrent read/write between threads. - * - * This is nested OUTSIDE the stream lock. - * This is nested OUTSIDE the consumer_relayd_sock_pair lock. - */ - pthread_mutex_t lock; - - /* - * Number of streams in the data stream hash table declared outside. - * Protected by consumer_data.lock. - */ - int stream_count; - - /* Channel hash table protected by consumer_data.lock. */ - struct lttng_ht *channel_ht; - /* - * Flag specifying if the local array of FDs needs update in the - * poll function. Protected by consumer_data.lock. - */ - unsigned int need_update; - enum lttng_consumer_type type; - - /* - * Relayd socket(s) hashtable indexed by network sequence number. Each - * stream has an index which associate the right relayd socket to use. - */ - struct lttng_ht *relayd_ht; - - /* - * This hash table contains all streams (metadata and data) indexed by - * session id. In other words, the ht is indexed by session id and each - * bucket contains the list of associated streams. - * - * This HT uses the "node_session_id" of the consumer stream. - */ - struct lttng_ht *stream_list_ht; - - /* - * This HT uses the "node_channel_id" of the consumer stream. - */ - struct lttng_ht *stream_per_chan_id_ht; -}; - -/* - * Init consumer data structures. - */ -int lttng_consumer_init(void); - -/* - * Set the error socket for communication with a session daemon. - */ -void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, - int sock); - -/* - * Set the command socket path for communication with a session daemon. - */ -void lttng_consumer_set_command_sock_path( - struct lttng_consumer_local_data *ctx, char *sock); - -/* - * Send return code to session daemon. - * - * Returns the return code of sendmsg : the number of bytes transmitted or -1 - * on error. - */ -int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd); - -/* - * Called from signal handler to ensure a clean exit. - */ -void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx); - -/* - * Cleanup the daemon's socket on exit. - */ -void lttng_consumer_cleanup(void); - -/* - * Flush pending writes to trace output disk file. - */ -void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, - off_t orig_offset); - -/* - * Poll on the should_quit pipe and the command socket return -1 on error and - * should exit, 0 if data is available on the command socket - */ -int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); - -struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, - uint64_t stream_key, - enum lttng_consumer_stream_state state, - const char *channel_name, - uid_t uid, - gid_t gid, - uint64_t relayd_id, - uint64_t session_id, - int cpu, - int *alloc_ret, - enum consumer_channel_type type, - unsigned int monitor); -struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, - uint64_t session_id, - const char *pathname, - const char *name, - uid_t uid, - gid_t gid, - uint64_t relayd_id, - enum lttng_event_output output, - uint64_t tracefile_size, - uint64_t tracefile_count, - uint64_t session_id_per_pid, - unsigned int monitor, - unsigned int live_timer_interval, - const char *root_shm_path, - const char *shm_path); -void consumer_del_stream(struct lttng_consumer_stream *stream, - struct lttng_ht *ht); -void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, - struct lttng_ht *ht); -int consumer_add_channel(struct lttng_consumer_channel *channel, - struct lttng_consumer_local_data *ctx); -void consumer_del_channel(struct lttng_consumer_channel *channel); - -/* lttng-relayd consumer command */ -struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key); -int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path); -int consumer_send_relayd_streams_sent(uint64_t net_seq_idx); -void close_relayd_stream(struct lttng_consumer_stream *stream); -struct lttng_consumer_channel *consumer_find_channel(uint64_t key); -int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, - size_t data_size); -void consumer_steal_stream_key(int key, struct lttng_ht *ht); - -struct lttng_consumer_local_data *lttng_consumer_create( - enum lttng_consumer_type type, - ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, - struct lttng_consumer_local_data *ctx), - int (*recv_channel)(struct lttng_consumer_channel *channel), - int (*recv_stream)(struct lttng_consumer_stream *stream), - int (*update_stream)(uint64_t sessiond_key, uint32_t state)); -void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); -ssize_t lttng_consumer_on_read_subbuffer_mmap( - struct lttng_consumer_local_data *ctx, - struct lttng_consumer_stream *stream, unsigned long len, - unsigned long padding, - struct ctf_packet_index *index); -ssize_t lttng_consumer_on_read_subbuffer_splice( - struct lttng_consumer_local_data *ctx, - struct lttng_consumer_stream *stream, unsigned long len, - unsigned long padding, - struct ctf_packet_index *index); -int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream); -int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, - unsigned long *pos); -int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream); -int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream); -void *consumer_thread_metadata_poll(void *data); -void *consumer_thread_data_poll(void *data); -void *consumer_thread_sessiond_poll(void *data); -void *consumer_thread_channel_poll(void *data); -int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, - int sock, struct pollfd *consumer_sockpoll); - -ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, - struct lttng_consumer_local_data *ctx); -int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); -int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, - struct lttng_consumer_local_data *ctx, int sock, - struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock, - uint64_t sessiond_id, uint64_t relayd_session_id); -void consumer_flag_relayd_for_destroy( - struct consumer_relayd_sock_pair *relayd); -int consumer_data_pending(uint64_t id); -int consumer_send_status_msg(int sock, int ret_code); -int consumer_send_status_channel(int sock, - struct lttng_consumer_channel *channel); -void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, - uint64_t key); -void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd); -unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, - unsigned long produced_pos, uint64_t nb_packets_per_stream, - uint64_t max_sb_size); -int consumer_add_data_stream(struct lttng_consumer_stream *stream); -void consumer_del_stream_for_data(struct lttng_consumer_stream *stream); -int consumer_add_metadata_stream(struct lttng_consumer_stream *stream); -void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream); -int consumer_create_index_file(struct lttng_consumer_stream *stream); - -#endif /* LIB_CONSUMER_H */ diff --git a/src/common/consumer/Makefile.am b/src/common/consumer/Makefile.am new file mode 100644 index 000000000..029fb1d68 --- /dev/null +++ b/src/common/consumer/Makefile.am @@ -0,0 +1,22 @@ +AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/src + +# Consumer library +noinst_LTLIBRARIES = libconsumer.la + +noinst_HEADERS = consumer-metadata-cache.h consumer-timer.h \ + consumer-testpoint.h + +libconsumer_la_SOURCES = consumer.c consumer.h consumer-metadata-cache.c \ + consumer-timer.c consumer-stream.c consumer-stream.h + +libconsumer_la_LIBADD = \ + $(top_builddir)/src/common/sessiond-comm/libsessiond-comm.la \ + $(top_builddir)/src/common/kernel-consumer/libkernel-consumer.la \ + $(top_builddir)/src/common/hashtable/libhashtable.la \ + $(top_builddir)/src/common/compat/libcompat.la \ + $(top_builddir)/src/common/relayd/librelayd.la + +if HAVE_LIBLTTNG_UST_CTL +libconsumer_la_LIBADD += \ + $(top_builddir)/src/common/ust-consumer/libust-consumer.la +endif diff --git a/src/common/consumer/consumer-metadata-cache.c b/src/common/consumer/consumer-metadata-cache.c new file mode 100644 index 000000000..48257c299 --- /dev/null +++ b/src/common/consumer/consumer-metadata-cache.c @@ -0,0 +1,238 @@ +/* + * Copyright (C) 2013 - Julien Desfossez + * David Goulet + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "consumer-metadata-cache.h" + +extern struct lttng_consumer_global_data consumer_data; + +/* + * Extend the allocated size of the metadata cache. Called only from + * lttng_ustconsumer_write_metadata_cache. + * + * Return 0 on success, a negative value on error. + */ +static int extend_metadata_cache(struct lttng_consumer_channel *channel, + unsigned int size) +{ + int ret = 0; + char *tmp_data_ptr; + unsigned int new_size, old_size; + + assert(channel); + assert(channel->metadata_cache); + + old_size = channel->metadata_cache->cache_alloc_size; + new_size = max_t(unsigned int, old_size + size, old_size << 1); + DBG("Extending metadata cache to %u", new_size); + tmp_data_ptr = realloc(channel->metadata_cache->data, new_size); + if (!tmp_data_ptr) { + ERR("Reallocating metadata cache"); + free(channel->metadata_cache->data); + ret = -1; + goto end; + } + /* Zero newly allocated memory */ + memset(tmp_data_ptr + old_size, 0, new_size - old_size); + channel->metadata_cache->data = tmp_data_ptr; + channel->metadata_cache->cache_alloc_size = new_size; + +end: + return ret; +} + +/* + * Write metadata to the cache, extend the cache if necessary. We support + * overlapping updates, but they need to be contiguous. Send the + * contiguous metadata in cache to the ring buffer. The metadata cache + * lock MUST be acquired to write in the cache. + * + * Return 0 on success, a negative value on error. + */ +int consumer_metadata_cache_write(struct lttng_consumer_channel *channel, + unsigned int offset, unsigned int len, char *data) +{ + int ret = 0; + int size_ret; + struct consumer_metadata_cache *cache; + + assert(channel); + assert(channel->metadata_cache); + + cache = channel->metadata_cache; + DBG("Writing %u bytes from offset %u in metadata cache", len, offset); + + if (offset + len > cache->cache_alloc_size) { + ret = extend_metadata_cache(channel, + len - cache->cache_alloc_size + offset); + if (ret < 0) { + ERR("Extending metadata cache"); + goto end; + } + } + + memcpy(cache->data + offset, data, len); + if (offset + len > cache->max_offset) { + char dummy = 'c'; + + cache->max_offset = offset + len; + if (channel->monitor) { + size_ret = lttng_write(channel->metadata_stream->ust_metadata_poll_pipe[1], + &dummy, 1); + if (size_ret < 1) { + ERR("Wakeup UST metadata pipe"); + ret = -1; + goto end; + } + } + } + +end: + return ret; +} + +/* + * Create the metadata cache, original allocated size: max_sb_size + * + * Return 0 on success, a negative value on error. + */ +int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel) +{ + int ret; + + assert(channel); + + channel->metadata_cache = zmalloc( + sizeof(struct consumer_metadata_cache)); + if (!channel->metadata_cache) { + PERROR("zmalloc metadata cache struct"); + ret = -1; + goto end; + } + ret = pthread_mutex_init(&channel->metadata_cache->lock, NULL); + if (ret != 0) { + PERROR("mutex init"); + goto end_free_cache; + } + + channel->metadata_cache->cache_alloc_size = DEFAULT_METADATA_CACHE_SIZE; + channel->metadata_cache->data = zmalloc( + channel->metadata_cache->cache_alloc_size * sizeof(char)); + if (!channel->metadata_cache->data) { + PERROR("zmalloc metadata cache data"); + ret = -1; + goto end_free_mutex; + } + DBG("Allocated metadata cache of %" PRIu64 " bytes", + channel->metadata_cache->cache_alloc_size); + + ret = 0; + goto end; + +end_free_mutex: + pthread_mutex_destroy(&channel->metadata_cache->lock); +end_free_cache: + free(channel->metadata_cache); +end: + return ret; +} + +/* + * Destroy and free the metadata cache + */ +void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel) +{ + if (!channel || !channel->metadata_cache) { + return; + } + + DBG("Destroying metadata cache"); + + pthread_mutex_destroy(&channel->metadata_cache->lock); + free(channel->metadata_cache->data); + free(channel->metadata_cache); +} + +/* + * Check if the cache is flushed up to the offset passed in parameter. + * + * Return 0 if everything has been flushed, 1 if there is data not flushed. + */ +int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, + uint64_t offset, int timer) +{ + int ret = 0; + struct lttng_consumer_stream *metadata_stream; + + assert(channel); + assert(channel->metadata_cache); + + /* + * If not called from a timer handler, we have to take the + * channel lock to be mutually exclusive with channel teardown. + * Timer handler does not need to take this lock because it is + * already synchronized by timer stop (and, more importantly, + * taking this lock in a timer handler would cause a deadlock). + */ + if (!timer) { + pthread_mutex_lock(&channel->lock); + } + pthread_mutex_lock(&channel->timer_lock); + pthread_mutex_lock(&channel->metadata_cache->lock); + + metadata_stream = channel->metadata_stream; + + if (!metadata_stream) { + /* + * Having no metadata stream means the channel is being destroyed so there + * is no cache to flush anymore. + */ + ret = 0; + } else if (metadata_stream->ust_metadata_pushed >= offset) { + ret = 0; + } else if (channel->metadata_stream->endpoint_status != + CONSUMER_ENDPOINT_ACTIVE) { + /* An inactive endpoint means we don't have to flush anymore. */ + ret = 0; + } else { + /* Still not completely flushed. */ + ret = 1; + } + + pthread_mutex_unlock(&channel->metadata_cache->lock); + pthread_mutex_unlock(&channel->timer_lock); + if (!timer) { + pthread_mutex_unlock(&channel->lock); + } + + return ret; +} diff --git a/src/common/consumer/consumer-metadata-cache.h b/src/common/consumer/consumer-metadata-cache.h new file mode 100644 index 000000000..8ce7f30b1 --- /dev/null +++ b/src/common/consumer/consumer-metadata-cache.h @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2013 - Julien Desfossez + * David Goulet + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef CONSUMER_METADATA_CACHE_H +#define CONSUMER_METADATA_CACHE_H + +#include + +struct consumer_metadata_cache { + char *data; + uint64_t cache_alloc_size; + /* + * The upper-limit of data written inside the buffer. + * + * With the total_bytes_written it allows us to keep track of when the + * cache contains contiguous metadata ready to be sent to the RB. + * All cached data is contiguous. + */ + uint64_t max_offset; + /* + * Lock to update the metadata cache and push into the ring_buffer + * (ustctl_write_metadata_to_channel). + * + * This is nested INSIDE the consumer_data lock. + */ + pthread_mutex_t lock; +}; + +int consumer_metadata_cache_write(struct lttng_consumer_channel *channel, + unsigned int offset, unsigned int len, char *data); +int consumer_metadata_cache_allocate(struct lttng_consumer_channel *channel); +void consumer_metadata_cache_destroy(struct lttng_consumer_channel *channel); +int consumer_metadata_cache_flushed(struct lttng_consumer_channel *channel, + uint64_t offset, int timer); + +#endif /* CONSUMER_METADATA_CACHE_H */ diff --git a/src/common/consumer/consumer-stream.c b/src/common/consumer/consumer-stream.c new file mode 100644 index 000000000..a62cef272 --- /dev/null +++ b/src/common/consumer/consumer-stream.c @@ -0,0 +1,554 @@ +/* + * Copyright (C) 2011 - Julien Desfossez + * Mathieu Desnoyers + * Copyright (C) 2013 - David Goulet + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License, version 2 only, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "consumer-stream.h" + +/* + * RCU call to free stream. MUST only be used with call_rcu(). + */ +static void free_stream_rcu(struct rcu_head *head) +{ + struct lttng_ht_node_u64 *node = + caa_container_of(head, struct lttng_ht_node_u64, head); + struct lttng_consumer_stream *stream = + caa_container_of(node, struct lttng_consumer_stream, node); + + pthread_mutex_destroy(&stream->lock); + free(stream); +} + +/* + * Close stream on the relayd side. This call can destroy a relayd if the + * conditions are met. + * + * A RCU read side lock MUST be acquired if the relayd object was looked up in + * a hash table before calling this. + */ +void consumer_stream_relayd_close(struct lttng_consumer_stream *stream, + struct consumer_relayd_sock_pair *relayd) +{ + int ret; + + assert(stream); + assert(relayd); + + if (stream->sent_to_relayd) { + uatomic_dec(&relayd->refcount); + assert(uatomic_read(&relayd->refcount) >= 0); + } + + /* Closing streams requires to lock the control socket. */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_send_close_stream(&relayd->control_sock, + stream->relayd_stream_id, + stream->next_net_seq_num - 1); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret < 0) { + DBG("Unable to close stream on the relayd. Continuing"); + /* + * Continue here. There is nothing we can do for the relayd. + * Chances are that the relayd has closed the socket so we just + * continue cleaning up. + */ + } + + /* Both conditions are met, we destroy the relayd. */ + if (uatomic_read(&relayd->refcount) == 0 && + uatomic_read(&relayd->destroy_flag)) { + consumer_destroy_relayd(relayd); + } + stream->net_seq_idx = (uint64_t) -1ULL; + stream->sent_to_relayd = 0; +} + +/* + * Close stream's file descriptors and, if needed, close stream also on the + * relayd side. + * + * The consumer data lock MUST be acquired. + * The stream lock MUST be acquired. + */ +void consumer_stream_close(struct lttng_consumer_stream *stream) +{ + int ret; + struct consumer_relayd_sock_pair *relayd; + + assert(stream); + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + if (stream->mmap_base != NULL) { + ret = munmap(stream->mmap_base, stream->mmap_len); + if (ret != 0) { + PERROR("munmap"); + } + } + + if (stream->wait_fd >= 0) { + ret = close(stream->wait_fd); + if (ret) { + PERROR("close"); + } + stream->wait_fd = -1; + } + if (stream->chan->output == CONSUMER_CHANNEL_SPLICE) { + utils_close_pipe(stream->splice_pipe); + } + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + { + /* + * Special case for the metadata since the wait fd is an internal pipe + * polled in the metadata thread. + */ + if (stream->metadata_flag && stream->chan->monitor) { + int rpipe = stream->ust_metadata_poll_pipe[0]; + + /* + * This will stop the channel timer if one and close the write side + * of the metadata poll pipe. + */ + lttng_ustconsumer_close_metadata(stream->chan); + if (rpipe >= 0) { + ret = close(rpipe); + if (ret < 0) { + PERROR("closing metadata pipe read side"); + } + stream->ust_metadata_poll_pipe[0] = -1; + } + } + break; + } + default: + ERR("Unknown consumer_data type"); + assert(0); + } + + /* Close output fd. Could be a socket or local file at this point. */ + if (stream->out_fd >= 0) { + ret = close(stream->out_fd); + if (ret) { + PERROR("close"); + } + stream->out_fd = -1; + } + + if (stream->index_fd >= 0) { + ret = close(stream->index_fd); + if (ret) { + PERROR("close stream index_fd"); + } + stream->index_fd = -1; + } + + /* Check and cleanup relayd if needed. */ + rcu_read_lock(); + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd != NULL) { + consumer_stream_relayd_close(stream, relayd); + } + rcu_read_unlock(); +} + +/* + * Delete the stream from all possible hash tables. + * + * The consumer data lock MUST be acquired. + * The stream lock MUST be acquired. + */ +void consumer_stream_delete(struct lttng_consumer_stream *stream, + struct lttng_ht *ht) +{ + int ret; + struct lttng_ht_iter iter; + + assert(stream); + /* Should NEVER be called not in monitor mode. */ + assert(stream->chan->monitor); + + rcu_read_lock(); + + if (ht) { + iter.iter.node = &stream->node.node; + ret = lttng_ht_del(ht, &iter); + assert(!ret); + } + + /* Delete from stream per channel ID hash table. */ + iter.iter.node = &stream->node_channel_id.node; + /* + * The returned value is of no importance. Even if the node is NOT in the + * hash table, we continue since we may have been called by a code path + * that did not add the stream to a (all) hash table. Same goes for the + * next call ht del call. + */ + (void) lttng_ht_del(consumer_data.stream_per_chan_id_ht, &iter); + + /* Delete from the global stream list. */ + iter.iter.node = &stream->node_session_id.node; + /* See the previous ht del on why we ignore the returned value. */ + (void) lttng_ht_del(consumer_data.stream_list_ht, &iter); + + rcu_read_unlock(); + + if (!stream->metadata_flag) { + /* Decrement the stream count of the global consumer data. */ + assert(consumer_data.stream_count > 0); + consumer_data.stream_count--; + } +} + +/* + * Free the given stream within a RCU call. + */ +void consumer_stream_free(struct lttng_consumer_stream *stream) +{ + assert(stream); + + call_rcu(&stream->node.head, free_stream_rcu); +} + +/* + * Destroy the stream's buffers of the tracer. + */ +void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream) +{ + assert(stream); + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + lttng_ustconsumer_del_stream(stream); + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + } +} + +/* + * Destroy and close a already created stream. + */ +static void destroy_close_stream(struct lttng_consumer_stream *stream) +{ + assert(stream); + + DBG("Consumer stream destroy monitored key: %" PRIu64, stream->key); + + /* Destroy tracer buffers of the stream. */ + consumer_stream_destroy_buffers(stream); + /* Close down everything including the relayd if one. */ + consumer_stream_close(stream); +} + +/* + * Decrement the stream's channel refcount and if down to 0, return the channel + * pointer so it can be destroyed by the caller or NULL if not. + */ +static struct lttng_consumer_channel *unref_channel( + struct lttng_consumer_stream *stream) +{ + struct lttng_consumer_channel *free_chan = NULL; + + assert(stream); + assert(stream->chan); + + /* Update refcount of channel and see if we need to destroy it. */ + if (!uatomic_sub_return(&stream->chan->refcount, 1) + && !uatomic_read(&stream->chan->nb_init_stream_left)) { + free_chan = stream->chan; + } + + return free_chan; +} + +/* + * Destroy a stream completely. This will delete, close and free the stream. + * Once return, the stream is NO longer usable. Its channel may get destroyed + * if conditions are met for a monitored stream. + * + * This MUST be called WITHOUT the consumer data and stream lock acquired if + * the stream is in _monitor_ mode else it does not matter. + */ +void consumer_stream_destroy(struct lttng_consumer_stream *stream, + struct lttng_ht *ht) +{ + assert(stream); + + /* Stream is in monitor mode. */ + if (stream->monitor) { + struct lttng_consumer_channel *free_chan = NULL; + + /* + * This means that the stream was successfully removed from the streams + * list of the channel and sent to the right thread managing this + * stream thus being globally visible. + */ + if (stream->globally_visible) { + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&stream->chan->lock); + pthread_mutex_lock(&stream->lock); + /* Remove every reference of the stream in the consumer. */ + consumer_stream_delete(stream, ht); + + destroy_close_stream(stream); + + /* Update channel's refcount of the stream. */ + free_chan = unref_channel(stream); + + /* Indicates that the consumer data state MUST be updated after this. */ + consumer_data.need_update = 1; + + pthread_mutex_unlock(&stream->lock); + pthread_mutex_unlock(&stream->chan->lock); + pthread_mutex_unlock(&consumer_data.lock); + } else { + /* + * If the stream is not visible globally, this needs to be done + * outside of the consumer data lock section. + */ + free_chan = unref_channel(stream); + } + + if (free_chan) { + consumer_del_channel(free_chan); + } + } else { + destroy_close_stream(stream); + } + + /* Free stream within a RCU call. */ + consumer_stream_free(stream); +} + +/* + * Write index of a specific stream either on the relayd or local disk. + * + * Return 0 on success or else a negative value. + */ +int consumer_stream_write_index(struct lttng_consumer_stream *stream, + struct ctf_packet_index *index) +{ + int ret; + struct consumer_relayd_sock_pair *relayd; + + assert(stream); + assert(index); + + rcu_read_lock(); + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd) { + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_send_index(&relayd->control_sock, index, + stream->relayd_stream_id, stream->next_net_seq_num - 1); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + } else { + ssize_t size_ret; + + size_ret = index_write(stream->index_fd, index, + sizeof(struct ctf_packet_index)); + if (size_ret < sizeof(struct ctf_packet_index)) { + ret = -1; + } else { + ret = 0; + } + } + if (ret < 0) { + goto error; + } + +error: + rcu_read_unlock(); + return ret; +} + +/* + * Actually do the metadata sync using the given metadata stream. + * + * Return 0 on success else a negative value. ENODATA can be returned also + * indicating that there is no metadata available for that stream. + */ +static int do_sync_metadata(struct lttng_consumer_stream *metadata, + struct lttng_consumer_local_data *ctx) +{ + int ret; + + assert(metadata); + assert(metadata->metadata_flag); + assert(ctx); + + /* + * In UST, since we have to write the metadata from the cache packet + * by packet, we might need to start this procedure multiple times + * until all the metadata from the cache has been extracted. + */ + do { + /* + * Steps : + * - Lock the metadata stream + * - Check if metadata stream node was deleted before locking. + * - if yes, release and return success + * - Check if new metadata is ready (flush + snapshot pos) + * - If nothing : release and return. + * - Lock the metadata_rdv_lock + * - Unlock the metadata stream + * - cond_wait on metadata_rdv to wait the wakeup from the + * metadata thread + * - Unlock the metadata_rdv_lock + */ + pthread_mutex_lock(&metadata->lock); + + /* + * There is a possibility that we were able to acquire a reference on the + * stream from the RCU hash table but between then and now, the node might + * have been deleted just before the lock is acquired. Thus, after locking, + * we make sure the metadata node has not been deleted which means that the + * buffers are closed. + * + * In that case, there is no need to sync the metadata hence returning a + * success return code. + */ + ret = cds_lfht_is_node_deleted(&metadata->node.node); + if (ret) { + ret = 0; + goto end_unlock_mutex; + } + + switch (ctx->type) { + case LTTNG_CONSUMER_KERNEL: + /* + * Empty the metadata cache and flush the current stream. + */ + ret = lttng_kconsumer_sync_metadata(metadata); + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + /* + * Ask the sessiond if we have new metadata waiting and update the + * consumer metadata cache. + */ + ret = lttng_ustconsumer_sync_metadata(ctx, metadata); + break; + default: + assert(0); + ret = -1; + break; + } + /* + * Error or no new metadata, we exit here. + */ + if (ret <= 0 || ret == ENODATA) { + goto end_unlock_mutex; + } + + /* + * At this point, new metadata have been flushed, so we wait on the + * rendez-vous point for the metadata thread to wake us up when it + * finishes consuming the metadata and continue execution. + */ + + pthread_mutex_lock(&metadata->metadata_rdv_lock); + + /* + * Release metadata stream lock so the metadata thread can process it. + */ + pthread_mutex_unlock(&metadata->lock); + + /* + * Wait on the rendez-vous point. Once woken up, it means the metadata was + * consumed and thus synchronization is achieved. + */ + pthread_cond_wait(&metadata->metadata_rdv, &metadata->metadata_rdv_lock); + pthread_mutex_unlock(&metadata->metadata_rdv_lock); + } while (ret == EAGAIN); + + /* Success */ + return 0; + +end_unlock_mutex: + pthread_mutex_unlock(&metadata->lock); + return ret; +} + +/* + * Synchronize the metadata using a given session ID. A successful acquisition + * of a metadata stream will trigger a request to the session daemon and a + * snapshot so the metadata thread can consume it. + * + * This function call is a rendez-vous point between the metadata thread and + * the data thread. + * + * Return 0 on success or else a negative value. + */ +int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, + uint64_t session_id) +{ + int ret; + struct lttng_consumer_stream *stream = NULL; + struct lttng_ht_iter iter; + struct lttng_ht *ht; + + assert(ctx); + + /* Ease our life a bit. */ + ht = consumer_data.stream_list_ht; + + rcu_read_lock(); + + /* Search the metadata associated with the session id of the given stream. */ + + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&session_id, lttng_ht_seed), ht->match_fct, + &session_id, &iter.iter, stream, node_session_id.node) { + if (!stream->metadata_flag) { + continue; + } + + ret = do_sync_metadata(stream, ctx); + if (ret < 0) { + goto end; + } + } + + /* + * Force return code to 0 (success) since ret might be ENODATA for instance + * which is not an error but rather that we should come back. + */ + ret = 0; + +end: + rcu_read_unlock(); + return ret; +} diff --git a/src/common/consumer/consumer-stream.h b/src/common/consumer/consumer-stream.h new file mode 100644 index 000000000..c5fb09732 --- /dev/null +++ b/src/common/consumer/consumer-stream.h @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2013 - David Goulet + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License, version 2 only, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef LTTNG_CONSUMER_STREAM_H +#define LTTNG_CONSUMER_STREAM_H + +#include "consumer.h" + +/* + * Close stream's file descriptors and, if needed, close stream also on the + * relayd side. + * + * The stream lock MUST be acquired. + * The consumer data lock MUST be acquired. + */ +void consumer_stream_close(struct lttng_consumer_stream *stream); + +/* + * Close stream on the relayd side. This call can destroy a relayd if the + * conditions are met. + * + * A RCU read side lock MUST be acquired if the relayd object was looked up in + * a hash table before calling this. + */ +void consumer_stream_relayd_close(struct lttng_consumer_stream *stream, + struct consumer_relayd_sock_pair *relayd); + +/* + * Delete the stream from all possible hash tables. + * + * The consumer data lock MUST be acquired. + */ +void consumer_stream_delete(struct lttng_consumer_stream *stream, + struct lttng_ht *ht); + +/* + * Free the given stream within a RCU call. + */ +void consumer_stream_free(struct lttng_consumer_stream *stream); + +/* + * Destroy a stream completely. This will delete, close and free the stream. + * Once return, the stream is NO longer usable. Its channel may get destroyed + * if conditions are met. + * + * This MUST be called WITHOUT the consumer data and stream lock acquired. + */ +void consumer_stream_destroy(struct lttng_consumer_stream *stream, + struct lttng_ht *ht); + +/* + * Destroy the stream's buffers on the tracer side. This is also called in a + * stream destroy. + */ +void consumer_stream_destroy_buffers(struct lttng_consumer_stream *stream); + +/* + * Write index of a specific stream either on the relayd or local disk. + */ +int consumer_stream_write_index(struct lttng_consumer_stream *stream, + struct ctf_packet_index *index); + +int consumer_stream_sync_metadata(struct lttng_consumer_local_data *ctx, + uint64_t session_id); + +#endif /* LTTNG_CONSUMER_STREAM_H */ diff --git a/src/common/consumer/consumer-testpoint.h b/src/common/consumer/consumer-testpoint.h new file mode 100644 index 000000000..e94ce57a2 --- /dev/null +++ b/src/common/consumer/consumer-testpoint.h @@ -0,0 +1,31 @@ +#ifndef CONSUMERD_TESTPOINT_H +#define CONSUMERD_TESTPOINT_H + +/* + * Copyright (C) 2012 - Christian Babeux + * Copyright (C) 2014 - Mathieu Desnoyers + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License, version 2 only, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include + +/* Testpoints, internal use only */ +TESTPOINT_DECL(consumerd_thread_channel); +TESTPOINT_DECL(consumerd_thread_metadata); +TESTPOINT_DECL(consumerd_thread_data); +TESTPOINT_DECL(consumerd_thread_sessiond); +TESTPOINT_DECL(consumerd_thread_metadata_timer); + +#endif /* CONSUMERD_TESTPOINT_H */ diff --git a/src/common/consumer/consumer-timer.c b/src/common/consumer/consumer-timer.c new file mode 100644 index 000000000..3c9b3feb7 --- /dev/null +++ b/src/common/consumer/consumer-timer.c @@ -0,0 +1,606 @@ +/* + * Copyright (C) 2012 - Julien Desfossez + * David Goulet + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License, version 2 only, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 51 + * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define _LGPL_SOURCE +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct timer_signal_data timer_signal = { + .tid = 0, + .setup_done = 0, + .qs_done = 0, + .lock = PTHREAD_MUTEX_INITIALIZER, +}; + +/* + * Set custom signal mask to current thread. + */ +static void setmask(sigset_t *mask) +{ + int ret; + + ret = sigemptyset(mask); + if (ret) { + PERROR("sigemptyset"); + } + ret = sigaddset(mask, LTTNG_CONSUMER_SIG_SWITCH); + if (ret) { + PERROR("sigaddset switch"); + } + ret = sigaddset(mask, LTTNG_CONSUMER_SIG_TEARDOWN); + if (ret) { + PERROR("sigaddset teardown"); + } + ret = sigaddset(mask, LTTNG_CONSUMER_SIG_LIVE); + if (ret) { + PERROR("sigaddset live"); + } +} + +/* + * Execute action on a timer switch. + * + * Beware: metadata_switch_timer() should *never* take a mutex also held + * while consumer_timer_switch_stop() is called. It would result in + * deadlocks. + */ +static void metadata_switch_timer(struct lttng_consumer_local_data *ctx, + int sig, siginfo_t *si, void *uc) +{ + int ret; + struct lttng_consumer_channel *channel; + + channel = si->si_value.sival_ptr; + assert(channel); + + if (channel->switch_timer_error) { + return; + } + + DBG("Switch timer for channel %" PRIu64, channel->key); + switch (ctx->type) { + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + /* + * Locks taken by lttng_ustconsumer_request_metadata(): + * - metadata_socket_lock + * - Calling lttng_ustconsumer_recv_metadata(): + * - channel->metadata_cache->lock + * - Calling consumer_metadata_cache_flushed(): + * - channel->timer_lock + * - channel->metadata_cache->lock + * + * Ensure that neither consumer_data.lock nor + * channel->lock are taken within this function, since + * they are held while consumer_timer_switch_stop() is + * called. + */ + ret = lttng_ustconsumer_request_metadata(ctx, channel, 1, 1); + if (ret < 0) { + channel->switch_timer_error = 1; + } + break; + case LTTNG_CONSUMER_KERNEL: + case LTTNG_CONSUMER_UNKNOWN: + assert(0); + break; + } +} + +static int send_empty_index(struct lttng_consumer_stream *stream, uint64_t ts, + uint64_t stream_id) +{ + int ret; + struct ctf_packet_index index; + + memset(&index, 0, sizeof(index)); + index.stream_id = htobe64(stream_id); + index.timestamp_end = htobe64(ts); + ret = consumer_stream_write_index(stream, &index); + if (ret < 0) { + goto error; + } + +error: + return ret; +} + +int consumer_flush_kernel_index(struct lttng_consumer_stream *stream) +{ + uint64_t ts, stream_id; + int ret; + + ret = kernctl_get_current_timestamp(stream->wait_fd, &ts); + if (ret < 0) { + ERR("Failed to get the current timestamp"); + goto end; + } + ret = kernctl_buffer_flush(stream->wait_fd); + if (ret < 0) { + ERR("Failed to flush kernel stream"); + goto end; + } + ret = kernctl_snapshot(stream->wait_fd); + if (ret < 0) { + if (errno != EAGAIN && errno != ENODATA) { + PERROR("live timer kernel snapshot"); + ret = -1; + goto end; + } + ret = kernctl_get_stream_id(stream->wait_fd, &stream_id); + if (ret < 0) { + PERROR("kernctl_get_stream_id"); + goto end; + } + DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); + ret = send_empty_index(stream, ts, stream_id); + if (ret < 0) { + goto end; + } + } + ret = 0; +end: + return ret; +} + +static int check_kernel_stream(struct lttng_consumer_stream *stream) +{ + int ret; + + /* + * While holding the stream mutex, try to take a snapshot, if it + * succeeds, it means that data is ready to be sent, just let the data + * thread handle that. Otherwise, if the snapshot returns EAGAIN, it + * means that there is no data to read after the flush, so we can + * safely send the empty index. + * + * Doing a trylock and checking if waiting on metadata if + * trylock fails. Bail out of the stream is indeed waiting for + * metadata to be pushed. Busy wait on trylock otherwise. + */ + for (;;) { + ret = pthread_mutex_trylock(&stream->lock); + switch (ret) { + case 0: + break; /* We have the lock. */ + case EBUSY: + pthread_mutex_lock(&stream->metadata_timer_lock); + if (stream->waiting_on_metadata) { + ret = 0; + stream->missed_metadata_flush = true; + pthread_mutex_unlock(&stream->metadata_timer_lock); + goto end; /* Bail out. */ + } + pthread_mutex_unlock(&stream->metadata_timer_lock); + /* Try again. */ + caa_cpu_relax(); + continue; + default: + ERR("Unexpected pthread_mutex_trylock error %d", ret); + ret = -1; + goto end; + } + break; + } + ret = consumer_flush_kernel_index(stream); + pthread_mutex_unlock(&stream->lock); +end: + return ret; +} + +int consumer_flush_ust_index(struct lttng_consumer_stream *stream) +{ + uint64_t ts, stream_id; + int ret; + + ret = cds_lfht_is_node_deleted(&stream->node.node); + if (ret) { + goto end; + } + + ret = lttng_ustconsumer_get_current_timestamp(stream, &ts); + if (ret < 0) { + ERR("Failed to get the current timestamp"); + goto end; + } + lttng_ustconsumer_flush_buffer(stream, 1); + ret = lttng_ustconsumer_take_snapshot(stream); + if (ret < 0) { + if (ret != -EAGAIN) { + ERR("Taking UST snapshot"); + ret = -1; + goto end; + } + ret = lttng_ustconsumer_get_stream_id(stream, &stream_id); + if (ret < 0) { + PERROR("ustctl_get_stream_id"); + goto end; + } + DBG("Stream %" PRIu64 " empty, sending beacon", stream->key); + ret = send_empty_index(stream, ts, stream_id); + if (ret < 0) { + goto end; + } + } + ret = 0; +end: + return ret; +} + +static int check_ust_stream(struct lttng_consumer_stream *stream) +{ + int ret; + + assert(stream); + assert(stream->ustream); + /* + * While holding the stream mutex, try to take a snapshot, if it + * succeeds, it means that data is ready to be sent, just let the data + * thread handle that. Otherwise, if the snapshot returns EAGAIN, it + * means that there is no data to read after the flush, so we can + * safely send the empty index. + * + * Doing a trylock and checking if waiting on metadata if + * trylock fails. Bail out of the stream is indeed waiting for + * metadata to be pushed. Busy wait on trylock otherwise. + */ + for (;;) { + ret = pthread_mutex_trylock(&stream->lock); + switch (ret) { + case 0: + break; /* We have the lock. */ + case EBUSY: + pthread_mutex_lock(&stream->metadata_timer_lock); + if (stream->waiting_on_metadata) { + ret = 0; + stream->missed_metadata_flush = true; + pthread_mutex_unlock(&stream->metadata_timer_lock); + goto end; /* Bail out. */ + } + pthread_mutex_unlock(&stream->metadata_timer_lock); + /* Try again. */ + caa_cpu_relax(); + continue; + default: + ERR("Unexpected pthread_mutex_trylock error %d", ret); + ret = -1; + goto end; + } + break; + } + ret = consumer_flush_ust_index(stream); + pthread_mutex_unlock(&stream->lock); +end: + return ret; +} + +/* + * Execute action on a live timer + */ +static void live_timer(struct lttng_consumer_local_data *ctx, + int sig, siginfo_t *si, void *uc) +{ + int ret; + struct lttng_consumer_channel *channel; + struct lttng_consumer_stream *stream; + struct lttng_ht *ht; + struct lttng_ht_iter iter; + + channel = si->si_value.sival_ptr; + assert(channel); + + if (channel->switch_timer_error) { + goto error; + } + ht = consumer_data.stream_per_chan_id_ht; + + DBG("Live timer for channel %" PRIu64, channel->key); + + rcu_read_lock(); + switch (ctx->type) { + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&channel->key, lttng_ht_seed), + ht->match_fct, &channel->key, &iter.iter, + stream, node_channel_id.node) { + ret = check_ust_stream(stream); + if (ret < 0) { + goto error_unlock; + } + } + break; + case LTTNG_CONSUMER_KERNEL: + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&channel->key, lttng_ht_seed), + ht->match_fct, &channel->key, &iter.iter, + stream, node_channel_id.node) { + ret = check_kernel_stream(stream); + if (ret < 0) { + goto error_unlock; + } + } + break; + case LTTNG_CONSUMER_UNKNOWN: + assert(0); + break; + } + +error_unlock: + rcu_read_unlock(); + +error: + return; +} + +static +void consumer_timer_signal_thread_qs(unsigned int signr) +{ + sigset_t pending_set; + int ret; + + /* + * We need to be the only thread interacting with the thread + * that manages signals for teardown synchronization. + */ + pthread_mutex_lock(&timer_signal.lock); + + /* Ensure we don't have any signal queued for this channel. */ + for (;;) { + ret = sigemptyset(&pending_set); + if (ret == -1) { + PERROR("sigemptyset"); + } + ret = sigpending(&pending_set); + if (ret == -1) { + PERROR("sigpending"); + } + if (!sigismember(&pending_set, LTTNG_CONSUMER_SIG_SWITCH)) { + break; + } + caa_cpu_relax(); + } + + /* + * From this point, no new signal handler will be fired that would try to + * access "chan". However, we still need to wait for any currently + * executing handler to complete. + */ + cmm_smp_mb(); + CMM_STORE_SHARED(timer_signal.qs_done, 0); + cmm_smp_mb(); + + /* + * Kill with LTTNG_CONSUMER_SIG_TEARDOWN, so signal management thread wakes + * up. + */ + kill(getpid(), LTTNG_CONSUMER_SIG_TEARDOWN); + + while (!CMM_LOAD_SHARED(timer_signal.qs_done)) { + caa_cpu_relax(); + } + cmm_smp_mb(); + + pthread_mutex_unlock(&timer_signal.lock); +} + +/* + * Set the timer for periodical metadata flush. + */ +void consumer_timer_switch_start(struct lttng_consumer_channel *channel, + unsigned int switch_timer_interval) +{ + int ret; + struct sigevent sev; + struct itimerspec its; + + assert(channel); + assert(channel->key); + + if (switch_timer_interval == 0) { + return; + } + + sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_signo = LTTNG_CONSUMER_SIG_SWITCH; + sev.sigev_value.sival_ptr = channel; + ret = timer_create(CLOCKID, &sev, &channel->switch_timer); + if (ret == -1) { + PERROR("timer_create"); + } + channel->switch_timer_enabled = 1; + + its.it_value.tv_sec = switch_timer_interval / 1000000; + its.it_value.tv_nsec = switch_timer_interval % 1000000; + its.it_interval.tv_sec = its.it_value.tv_sec; + its.it_interval.tv_nsec = its.it_value.tv_nsec; + + ret = timer_settime(channel->switch_timer, 0, &its, NULL); + if (ret == -1) { + PERROR("timer_settime"); + } +} + +/* + * Stop and delete timer. + */ +void consumer_timer_switch_stop(struct lttng_consumer_channel *channel) +{ + int ret; + + assert(channel); + + ret = timer_delete(channel->switch_timer); + if (ret == -1) { + PERROR("timer_delete"); + } + + consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_SWITCH); + + channel->switch_timer = 0; + channel->switch_timer_enabled = 0; +} + +/* + * Set the timer for the live mode. + */ +void consumer_timer_live_start(struct lttng_consumer_channel *channel, + int live_timer_interval) +{ + int ret; + struct sigevent sev; + struct itimerspec its; + + assert(channel); + assert(channel->key); + + if (live_timer_interval <= 0) { + return; + } + + sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_signo = LTTNG_CONSUMER_SIG_LIVE; + sev.sigev_value.sival_ptr = channel; + ret = timer_create(CLOCKID, &sev, &channel->live_timer); + if (ret == -1) { + PERROR("timer_create"); + } + channel->live_timer_enabled = 1; + + its.it_value.tv_sec = live_timer_interval / 1000000; + its.it_value.tv_nsec = live_timer_interval % 1000000; + its.it_interval.tv_sec = its.it_value.tv_sec; + its.it_interval.tv_nsec = its.it_value.tv_nsec; + + ret = timer_settime(channel->live_timer, 0, &its, NULL); + if (ret == -1) { + PERROR("timer_settime"); + } +} + +/* + * Stop and delete timer. + */ +void consumer_timer_live_stop(struct lttng_consumer_channel *channel) +{ + int ret; + + assert(channel); + + ret = timer_delete(channel->live_timer); + if (ret == -1) { + PERROR("timer_delete"); + } + + consumer_timer_signal_thread_qs(LTTNG_CONSUMER_SIG_LIVE); + + channel->live_timer = 0; + channel->live_timer_enabled = 0; +} + +/* + * Block the RT signals for the entire process. It must be called from the + * consumer main before creating the threads + */ +int consumer_signal_init(void) +{ + int ret; + sigset_t mask; + + /* Block signal for entire process, so only our thread processes it. */ + setmask(&mask); + ret = pthread_sigmask(SIG_BLOCK, &mask, NULL); + if (ret) { + errno = ret; + PERROR("pthread_sigmask"); + return -1; + } + return 0; +} + +/* + * This thread is the sighandler for signals LTTNG_CONSUMER_SIG_SWITCH, + * LTTNG_CONSUMER_SIG_TEARDOWN and LTTNG_CONSUMER_SIG_LIVE. + */ +void *consumer_timer_thread(void *data) +{ + int signr; + sigset_t mask; + siginfo_t info; + struct lttng_consumer_local_data *ctx = data; + + rcu_register_thread(); + + health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA_TIMER); + + if (testpoint(consumerd_thread_metadata_timer)) { + goto error_testpoint; + } + + health_code_update(); + + /* Only self thread will receive signal mask. */ + setmask(&mask); + CMM_STORE_SHARED(timer_signal.tid, pthread_self()); + + while (1) { + health_code_update(); + + health_poll_entry(); + signr = sigwaitinfo(&mask, &info); + health_poll_exit(); + if (signr == -1) { + if (errno != EINTR) { + PERROR("sigwaitinfo"); + } + continue; + } else if (signr == LTTNG_CONSUMER_SIG_SWITCH) { + metadata_switch_timer(ctx, info.si_signo, &info, NULL); + } else if (signr == LTTNG_CONSUMER_SIG_TEARDOWN) { + cmm_smp_mb(); + CMM_STORE_SHARED(timer_signal.qs_done, 1); + cmm_smp_mb(); + DBG("Signal timer metadata thread teardown"); + } else if (signr == LTTNG_CONSUMER_SIG_LIVE) { + live_timer(ctx, info.si_signo, &info, NULL); + } else { + ERR("Unexpected signal %d\n", info.si_signo); + } + } + +error_testpoint: + /* Only reached in testpoint error */ + health_error(); + health_unregister(health_consumerd); + + rcu_unregister_thread(); + + /* Never return */ + return NULL; +} diff --git a/src/common/consumer/consumer-timer.h b/src/common/consumer/consumer-timer.h new file mode 100644 index 000000000..22e74574c --- /dev/null +++ b/src/common/consumer/consumer-timer.h @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2011 - Julien Desfossez + * Mathieu Desnoyers + * 2012 - David Goulet + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef CONSUMER_TIMER_H +#define CONSUMER_TIMER_H + +#include + +#include "consumer.h" + +#define LTTNG_CONSUMER_SIG_SWITCH SIGRTMIN + 10 +#define LTTNG_CONSUMER_SIG_TEARDOWN SIGRTMIN + 11 +#define LTTNG_CONSUMER_SIG_LIVE SIGRTMIN + 12 + +#define CLOCKID CLOCK_MONOTONIC + +/* + * Handle timer teardown race wrt memory free of private data by consumer + * signals are handled by a single thread, which permits a synchronization + * point between handling of each signal. Internal lock ensures mutual + * exclusion. + */ +struct timer_signal_data { + pthread_t tid; /* thread id managing signals */ + int setup_done; + int qs_done; + pthread_mutex_t lock; +}; + +void consumer_timer_switch_start(struct lttng_consumer_channel *channel, + unsigned int switch_timer_interval); +void consumer_timer_switch_stop(struct lttng_consumer_channel *channel); +void consumer_timer_live_start(struct lttng_consumer_channel *channel, + int live_timer_interval); +void consumer_timer_live_stop(struct lttng_consumer_channel *channel); +void *consumer_timer_thread(void *data); +int consumer_signal_init(void); + +int consumer_flush_kernel_index(struct lttng_consumer_stream *stream); +int consumer_flush_ust_index(struct lttng_consumer_stream *stream); + +#endif /* CONSUMER_TIMER_H */ diff --git a/src/common/consumer/consumer.c b/src/common/consumer/consumer.c new file mode 100644 index 000000000..2897fb855 --- /dev/null +++ b/src/common/consumer/consumer.c @@ -0,0 +1,3712 @@ +/* + * Copyright (C) 2011 - Julien Desfossez + * Mathieu Desnoyers + * 2012 - David Goulet + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct lttng_consumer_global_data consumer_data = { + .stream_count = 0, + .need_update = 1, + .type = LTTNG_CONSUMER_UNKNOWN, +}; + +enum consumer_channel_action { + CONSUMER_CHANNEL_ADD, + CONSUMER_CHANNEL_DEL, + CONSUMER_CHANNEL_QUIT, +}; + +struct consumer_channel_msg { + enum consumer_channel_action action; + struct lttng_consumer_channel *chan; /* add */ + uint64_t key; /* del */ +}; + +/* + * Flag to inform the polling thread to quit when all fd hung up. Updated by + * the consumer_thread_receive_fds when it notices that all fds has hung up. + * Also updated by the signal handler (consumer_should_exit()). Read by the + * polling threads. + */ +volatile int consumer_quit; + +/* + * Global hash table containing respectively metadata and data streams. The + * stream element in this ht should only be updated by the metadata poll thread + * for the metadata and the data poll thread for the data. + */ +static struct lttng_ht *metadata_ht; +static struct lttng_ht *data_ht; + +/* + * Notify a thread lttng pipe to poll back again. This usually means that some + * global state has changed so we just send back the thread in a poll wait + * call. + */ +static void notify_thread_lttng_pipe(struct lttng_pipe *pipe) +{ + struct lttng_consumer_stream *null_stream = NULL; + + assert(pipe); + + (void) lttng_pipe_write(pipe, &null_stream, sizeof(null_stream)); +} + +static void notify_health_quit_pipe(int *pipe) +{ + ssize_t ret; + + ret = lttng_write(pipe[1], "4", 1); + if (ret < 1) { + PERROR("write consumer health quit"); + } +} + +static void notify_channel_pipe(struct lttng_consumer_local_data *ctx, + struct lttng_consumer_channel *chan, + uint64_t key, + enum consumer_channel_action action) +{ + struct consumer_channel_msg msg; + ssize_t ret; + + memset(&msg, 0, sizeof(msg)); + + msg.action = action; + msg.chan = chan; + msg.key = key; + ret = lttng_write(ctx->consumer_channel_pipe[1], &msg, sizeof(msg)); + if (ret < sizeof(msg)) { + PERROR("notify_channel_pipe write error"); + } +} + +void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, + uint64_t key) +{ + notify_channel_pipe(ctx, NULL, key, CONSUMER_CHANNEL_DEL); +} + +static int read_channel_pipe(struct lttng_consumer_local_data *ctx, + struct lttng_consumer_channel **chan, + uint64_t *key, + enum consumer_channel_action *action) +{ + struct consumer_channel_msg msg; + ssize_t ret; + + ret = lttng_read(ctx->consumer_channel_pipe[0], &msg, sizeof(msg)); + if (ret < sizeof(msg)) { + ret = -1; + goto error; + } + *action = msg.action; + *chan = msg.chan; + *key = msg.key; +error: + return (int) ret; +} + +/* + * Cleanup the stream list of a channel. Those streams are not yet globally + * visible + */ +static void clean_channel_stream_list(struct lttng_consumer_channel *channel) +{ + struct lttng_consumer_stream *stream, *stmp; + + assert(channel); + + /* Delete streams that might have been left in the stream list. */ + cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, + send_node) { + cds_list_del(&stream->send_node); + /* + * Once a stream is added to this list, the buffers were created so we + * have a guarantee that this call will succeed. Setting the monitor + * mode to 0 so we don't lock nor try to delete the stream from the + * global hash table. + */ + stream->monitor = 0; + consumer_stream_destroy(stream, NULL); + } +} + +/* + * Find a stream. The consumer_data.lock must be locked during this + * call. + */ +static struct lttng_consumer_stream *find_stream(uint64_t key, + struct lttng_ht *ht) +{ + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + struct lttng_consumer_stream *stream = NULL; + + assert(ht); + + /* -1ULL keys are lookup failures */ + if (key == (uint64_t) -1ULL) { + return NULL; + } + + rcu_read_lock(); + + lttng_ht_lookup(ht, &key, &iter); + node = lttng_ht_iter_get_node_u64(&iter); + if (node != NULL) { + stream = caa_container_of(node, struct lttng_consumer_stream, node); + } + + rcu_read_unlock(); + + return stream; +} + +static void steal_stream_key(uint64_t key, struct lttng_ht *ht) +{ + struct lttng_consumer_stream *stream; + + rcu_read_lock(); + stream = find_stream(key, ht); + if (stream) { + stream->key = (uint64_t) -1ULL; + /* + * We don't want the lookup to match, but we still need + * to iterate on this stream when iterating over the hash table. Just + * change the node key. + */ + stream->node.key = (uint64_t) -1ULL; + } + rcu_read_unlock(); +} + +/* + * Return a channel object for the given key. + * + * RCU read side lock MUST be acquired before calling this function and + * protects the channel ptr. + */ +struct lttng_consumer_channel *consumer_find_channel(uint64_t key) +{ + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + struct lttng_consumer_channel *channel = NULL; + + /* -1ULL keys are lookup failures */ + if (key == (uint64_t) -1ULL) { + return NULL; + } + + lttng_ht_lookup(consumer_data.channel_ht, &key, &iter); + node = lttng_ht_iter_get_node_u64(&iter); + if (node != NULL) { + channel = caa_container_of(node, struct lttng_consumer_channel, node); + } + + return channel; +} + +/* + * There is a possibility that the consumer does not have enough time between + * the close of the channel on the session daemon and the cleanup in here thus + * once we have a channel add with an existing key, we know for sure that this + * channel will eventually get cleaned up by all streams being closed. + * + * This function just nullifies the already existing channel key. + */ +static void steal_channel_key(uint64_t key) +{ + struct lttng_consumer_channel *channel; + + rcu_read_lock(); + channel = consumer_find_channel(key); + if (channel) { + channel->key = (uint64_t) -1ULL; + /* + * We don't want the lookup to match, but we still need to iterate on + * this channel when iterating over the hash table. Just change the + * node key. + */ + channel->node.key = (uint64_t) -1ULL; + } + rcu_read_unlock(); +} + +static void free_channel_rcu(struct rcu_head *head) +{ + struct lttng_ht_node_u64 *node = + caa_container_of(head, struct lttng_ht_node_u64, head); + struct lttng_consumer_channel *channel = + caa_container_of(node, struct lttng_consumer_channel, node); + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + lttng_ustconsumer_free_channel(channel); + break; + default: + ERR("Unknown consumer_data type"); + abort(); + } + free(channel); +} + +/* + * RCU protected relayd socket pair free. + */ +static void free_relayd_rcu(struct rcu_head *head) +{ + struct lttng_ht_node_u64 *node = + caa_container_of(head, struct lttng_ht_node_u64, head); + struct consumer_relayd_sock_pair *relayd = + caa_container_of(node, struct consumer_relayd_sock_pair, node); + + /* + * Close all sockets. This is done in the call RCU since we don't want the + * socket fds to be reassigned thus potentially creating bad state of the + * relayd object. + * + * We do not have to lock the control socket mutex here since at this stage + * there is no one referencing to this relayd object. + */ + (void) relayd_close(&relayd->control_sock); + (void) relayd_close(&relayd->data_sock); + + free(relayd); +} + +/* + * Destroy and free relayd socket pair object. + */ +void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd) +{ + int ret; + struct lttng_ht_iter iter; + + if (relayd == NULL) { + return; + } + + DBG("Consumer destroy and close relayd socket pair"); + + iter.iter.node = &relayd->node.node; + ret = lttng_ht_del(consumer_data.relayd_ht, &iter); + if (ret != 0) { + /* We assume the relayd is being or is destroyed */ + return; + } + + /* RCU free() call */ + call_rcu(&relayd->node.head, free_relayd_rcu); +} + +/* + * Remove a channel from the global list protected by a mutex. This function is + * also responsible for freeing its data structures. + */ +void consumer_del_channel(struct lttng_consumer_channel *channel) +{ + int ret; + struct lttng_ht_iter iter; + + DBG("Consumer delete channel key %" PRIu64, channel->key); + + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&channel->lock); + + /* Destroy streams that might have been left in the stream list. */ + clean_channel_stream_list(channel); + + if (channel->live_timer_enabled == 1) { + consumer_timer_live_stop(channel); + } + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + lttng_ustconsumer_del_channel(channel); + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + goto end; + } + + rcu_read_lock(); + iter.iter.node = &channel->node.node; + ret = lttng_ht_del(consumer_data.channel_ht, &iter); + assert(!ret); + rcu_read_unlock(); + + call_rcu(&channel->node.head, free_channel_rcu); +end: + pthread_mutex_unlock(&channel->lock); + pthread_mutex_unlock(&consumer_data.lock); +} + +/* + * Iterate over the relayd hash table and destroy each element. Finally, + * destroy the whole hash table. + */ +static void cleanup_relayd_ht(void) +{ + struct lttng_ht_iter iter; + struct consumer_relayd_sock_pair *relayd; + + rcu_read_lock(); + + cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, + node.node) { + consumer_destroy_relayd(relayd); + } + + rcu_read_unlock(); + + lttng_ht_destroy(consumer_data.relayd_ht); +} + +/* + * Update the end point status of all streams having the given network sequence + * index (relayd index). + * + * It's atomically set without having the stream mutex locked which is fine + * because we handle the write/read race with a pipe wakeup for each thread. + */ +static void update_endpoint_status_by_netidx(uint64_t net_seq_idx, + enum consumer_endpoint_status status) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + DBG("Consumer set delete flag on stream by idx %" PRIu64, net_seq_idx); + + rcu_read_lock(); + + /* Let's begin with metadata */ + cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { + if (stream->net_seq_idx == net_seq_idx) { + uatomic_set(&stream->endpoint_status, status); + DBG("Delete flag set to metadata stream %d", stream->wait_fd); + } + } + + /* Follow up by the data streams */ + cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { + if (stream->net_seq_idx == net_seq_idx) { + uatomic_set(&stream->endpoint_status, status); + DBG("Delete flag set to data stream %d", stream->wait_fd); + } + } + rcu_read_unlock(); +} + +/* + * Cleanup a relayd object by flagging every associated streams for deletion, + * destroying the object meaning removing it from the relayd hash table, + * closing the sockets and freeing the memory in a RCU call. + * + * If a local data context is available, notify the threads that the streams' + * state have changed. + */ +static void cleanup_relayd(struct consumer_relayd_sock_pair *relayd, + struct lttng_consumer_local_data *ctx) +{ + uint64_t netidx; + + assert(relayd); + + DBG("Cleaning up relayd sockets"); + + /* Save the net sequence index before destroying the object */ + netidx = relayd->net_seq_idx; + + /* + * Delete the relayd from the relayd hash table, close the sockets and free + * the object in a RCU call. + */ + consumer_destroy_relayd(relayd); + + /* Set inactive endpoint to all streams */ + update_endpoint_status_by_netidx(netidx, CONSUMER_ENDPOINT_INACTIVE); + + /* + * With a local data context, notify the threads that the streams' state + * have changed. The write() action on the pipe acts as an "implicit" + * memory barrier ordering the updates of the end point status from the + * read of this status which happens AFTER receiving this notify. + */ + if (ctx) { + notify_thread_lttng_pipe(ctx->consumer_data_pipe); + notify_thread_lttng_pipe(ctx->consumer_metadata_pipe); + } +} + +/* + * Flag a relayd socket pair for destruction. Destroy it if the refcount + * reaches zero. + * + * RCU read side lock MUST be aquired before calling this function. + */ +void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair *relayd) +{ + assert(relayd); + + /* Set destroy flag for this object */ + uatomic_set(&relayd->destroy_flag, 1); + + /* Destroy the relayd if refcount is 0 */ + if (uatomic_read(&relayd->refcount) == 0) { + consumer_destroy_relayd(relayd); + } +} + +/* + * Completly destroy stream from every visiable data structure and the given + * hash table if one. + * + * One this call returns, the stream object is not longer usable nor visible. + */ +void consumer_del_stream(struct lttng_consumer_stream *stream, + struct lttng_ht *ht) +{ + consumer_stream_destroy(stream, ht); +} + +/* + * XXX naming of del vs destroy is all mixed up. + */ +void consumer_del_stream_for_data(struct lttng_consumer_stream *stream) +{ + consumer_stream_destroy(stream, data_ht); +} + +void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream) +{ + consumer_stream_destroy(stream, metadata_ht); +} + +struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, + uint64_t stream_key, + enum lttng_consumer_stream_state state, + const char *channel_name, + uid_t uid, + gid_t gid, + uint64_t relayd_id, + uint64_t session_id, + int cpu, + int *alloc_ret, + enum consumer_channel_type type, + unsigned int monitor) +{ + int ret; + struct lttng_consumer_stream *stream; + + stream = zmalloc(sizeof(*stream)); + if (stream == NULL) { + PERROR("malloc struct lttng_consumer_stream"); + ret = -ENOMEM; + goto end; + } + + rcu_read_lock(); + + stream->key = stream_key; + stream->out_fd = -1; + stream->out_fd_offset = 0; + stream->output_written = 0; + stream->state = state; + stream->uid = uid; + stream->gid = gid; + stream->net_seq_idx = relayd_id; + stream->session_id = session_id; + stream->monitor = monitor; + stream->endpoint_status = CONSUMER_ENDPOINT_ACTIVE; + stream->index_fd = -1; + pthread_mutex_init(&stream->lock, NULL); + pthread_mutex_init(&stream->metadata_timer_lock, NULL); + + /* If channel is the metadata, flag this stream as metadata. */ + if (type == CONSUMER_CHANNEL_TYPE_METADATA) { + stream->metadata_flag = 1; + /* Metadata is flat out. */ + strncpy(stream->name, DEFAULT_METADATA_NAME, sizeof(stream->name)); + /* Live rendez-vous point. */ + pthread_cond_init(&stream->metadata_rdv, NULL); + pthread_mutex_init(&stream->metadata_rdv_lock, NULL); + } else { + /* Format stream name to _ */ + ret = snprintf(stream->name, sizeof(stream->name), "%s_%d", + channel_name, cpu); + if (ret < 0) { + PERROR("snprintf stream name"); + goto error; + } + } + + /* Key is always the wait_fd for streams. */ + lttng_ht_node_init_u64(&stream->node, stream->key); + + /* Init node per channel id key */ + lttng_ht_node_init_u64(&stream->node_channel_id, channel_key); + + /* Init session id node with the stream session id */ + lttng_ht_node_init_u64(&stream->node_session_id, stream->session_id); + + DBG3("Allocated stream %s (key %" PRIu64 ", chan_key %" PRIu64 + " relayd_id %" PRIu64 ", session_id %" PRIu64, + stream->name, stream->key, channel_key, + stream->net_seq_idx, stream->session_id); + + rcu_read_unlock(); + return stream; + +error: + rcu_read_unlock(); + free(stream); +end: + if (alloc_ret) { + *alloc_ret = ret; + } + return NULL; +} + +/* + * Add a stream to the global list protected by a mutex. + */ +int consumer_add_data_stream(struct lttng_consumer_stream *stream) +{ + struct lttng_ht *ht = data_ht; + int ret = 0; + + assert(stream); + assert(ht); + + DBG3("Adding consumer stream %" PRIu64, stream->key); + + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&stream->chan->lock); + pthread_mutex_lock(&stream->chan->timer_lock); + pthread_mutex_lock(&stream->lock); + rcu_read_lock(); + + /* Steal stream identifier to avoid having streams with the same key */ + steal_stream_key(stream->key, ht); + + lttng_ht_add_unique_u64(ht, &stream->node); + + lttng_ht_add_u64(consumer_data.stream_per_chan_id_ht, + &stream->node_channel_id); + + /* + * Add stream to the stream_list_ht of the consumer data. No need to steal + * the key since the HT does not use it and we allow to add redundant keys + * into this table. + */ + lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); + + /* + * When nb_init_stream_left reaches 0, we don't need to trigger any action + * in terms of destroying the associated channel, because the action that + * causes the count to become 0 also causes a stream to be added. The + * channel deletion will thus be triggered by the following removal of this + * stream. + */ + if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { + /* Increment refcount before decrementing nb_init_stream_left */ + cmm_smp_wmb(); + uatomic_dec(&stream->chan->nb_init_stream_left); + } + + /* Update consumer data once the node is inserted. */ + consumer_data.stream_count++; + consumer_data.need_update = 1; + + rcu_read_unlock(); + pthread_mutex_unlock(&stream->lock); + pthread_mutex_unlock(&stream->chan->timer_lock); + pthread_mutex_unlock(&stream->chan->lock); + pthread_mutex_unlock(&consumer_data.lock); + + return ret; +} + +void consumer_del_data_stream(struct lttng_consumer_stream *stream) +{ + consumer_del_stream(stream, data_ht); +} + +/* + * Add relayd socket to global consumer data hashtable. RCU read side lock MUST + * be acquired before calling this. + */ +static int add_relayd(struct consumer_relayd_sock_pair *relayd) +{ + int ret = 0; + struct lttng_ht_node_u64 *node; + struct lttng_ht_iter iter; + + assert(relayd); + + lttng_ht_lookup(consumer_data.relayd_ht, + &relayd->net_seq_idx, &iter); + node = lttng_ht_iter_get_node_u64(&iter); + if (node != NULL) { + goto end; + } + lttng_ht_add_unique_u64(consumer_data.relayd_ht, &relayd->node); + +end: + return ret; +} + +/* + * Allocate and return a consumer relayd socket. + */ +static struct consumer_relayd_sock_pair *consumer_allocate_relayd_sock_pair( + uint64_t net_seq_idx) +{ + struct consumer_relayd_sock_pair *obj = NULL; + + /* net sequence index of -1 is a failure */ + if (net_seq_idx == (uint64_t) -1ULL) { + goto error; + } + + obj = zmalloc(sizeof(struct consumer_relayd_sock_pair)); + if (obj == NULL) { + PERROR("zmalloc relayd sock"); + goto error; + } + + obj->net_seq_idx = net_seq_idx; + obj->refcount = 0; + obj->destroy_flag = 0; + obj->control_sock.sock.fd = -1; + obj->data_sock.sock.fd = -1; + lttng_ht_node_init_u64(&obj->node, obj->net_seq_idx); + pthread_mutex_init(&obj->ctrl_sock_mutex, NULL); + +error: + return obj; +} + +/* + * Find a relayd socket pair in the global consumer data. + * + * Return the object if found else NULL. + * RCU read-side lock must be held across this call and while using the + * returned object. + */ +struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key) +{ + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + struct consumer_relayd_sock_pair *relayd = NULL; + + /* Negative keys are lookup failures */ + if (key == (uint64_t) -1ULL) { + goto error; + } + + lttng_ht_lookup(consumer_data.relayd_ht, &key, + &iter); + node = lttng_ht_iter_get_node_u64(&iter); + if (node != NULL) { + relayd = caa_container_of(node, struct consumer_relayd_sock_pair, node); + } + +error: + return relayd; +} + +/* + * Find a relayd and send the stream + * + * Returns 0 on success, < 0 on error + */ +int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, + char *path) +{ + int ret = 0; + struct consumer_relayd_sock_pair *relayd; + + assert(stream); + assert(stream->net_seq_idx != -1ULL); + assert(path); + + /* The stream is not metadata. Get relayd reference if exists. */ + rcu_read_lock(); + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd != NULL) { + /* Add stream on the relayd */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_add_stream(&relayd->control_sock, stream->name, + path, &stream->relayd_stream_id, + stream->chan->tracefile_size, stream->chan->tracefile_count); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret < 0) { + goto end; + } + + uatomic_inc(&relayd->refcount); + stream->sent_to_relayd = 1; + } else { + ERR("Stream %" PRIu64 " relayd ID %" PRIu64 " unknown. Can't send it.", + stream->key, stream->net_seq_idx); + ret = -1; + goto end; + } + + DBG("Stream %s with key %" PRIu64 " sent to relayd id %" PRIu64, + stream->name, stream->key, stream->net_seq_idx); + +end: + rcu_read_unlock(); + return ret; +} + +/* + * Find a relayd and send the streams sent message + * + * Returns 0 on success, < 0 on error + */ +int consumer_send_relayd_streams_sent(uint64_t net_seq_idx) +{ + int ret = 0; + struct consumer_relayd_sock_pair *relayd; + + assert(net_seq_idx != -1ULL); + + /* The stream is not metadata. Get relayd reference if exists. */ + rcu_read_lock(); + relayd = consumer_find_relayd(net_seq_idx); + if (relayd != NULL) { + /* Add stream on the relayd */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_streams_sent(&relayd->control_sock); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret < 0) { + goto end; + } + } else { + ERR("Relayd ID %" PRIu64 " unknown. Can't send streams_sent.", + net_seq_idx); + ret = -1; + goto end; + } + + ret = 0; + DBG("All streams sent relayd id %" PRIu64, net_seq_idx); + +end: + rcu_read_unlock(); + return ret; +} + +/* + * Find a relayd and close the stream + */ +void close_relayd_stream(struct lttng_consumer_stream *stream) +{ + struct consumer_relayd_sock_pair *relayd; + + /* The stream is not metadata. Get relayd reference if exists. */ + rcu_read_lock(); + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd) { + consumer_stream_relayd_close(stream, relayd); + } + rcu_read_unlock(); +} + +/* + * Handle stream for relayd transmission if the stream applies for network + * streaming where the net sequence index is set. + * + * Return destination file descriptor or negative value on error. + */ +static int write_relayd_stream_header(struct lttng_consumer_stream *stream, + size_t data_size, unsigned long padding, + struct consumer_relayd_sock_pair *relayd) +{ + int outfd = -1, ret; + struct lttcomm_relayd_data_hdr data_hdr; + + /* Safety net */ + assert(stream); + assert(relayd); + + /* Reset data header */ + memset(&data_hdr, 0, sizeof(data_hdr)); + + if (stream->metadata_flag) { + /* Caller MUST acquire the relayd control socket lock */ + ret = relayd_send_metadata(&relayd->control_sock, data_size); + if (ret < 0) { + goto error; + } + + /* Metadata are always sent on the control socket. */ + outfd = relayd->control_sock.sock.fd; + } else { + /* Set header with stream information */ + data_hdr.stream_id = htobe64(stream->relayd_stream_id); + data_hdr.data_size = htobe32(data_size); + data_hdr.padding_size = htobe32(padding); + /* + * Note that net_seq_num below is assigned with the *current* value of + * next_net_seq_num and only after that the next_net_seq_num will be + * increment. This is why when issuing a command on the relayd using + * this next value, 1 should always be substracted in order to compare + * the last seen sequence number on the relayd side to the last sent. + */ + data_hdr.net_seq_num = htobe64(stream->next_net_seq_num); + /* Other fields are zeroed previously */ + + ret = relayd_send_data_hdr(&relayd->data_sock, &data_hdr, + sizeof(data_hdr)); + if (ret < 0) { + goto error; + } + + ++stream->next_net_seq_num; + + /* Set to go on data socket */ + outfd = relayd->data_sock.sock.fd; + } + +error: + return outfd; +} + +/* + * Allocate and return a new lttng_consumer_channel object using the given key + * to initialize the hash table node. + * + * On error, return NULL. + */ +struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, + uint64_t session_id, + const char *pathname, + const char *name, + uid_t uid, + gid_t gid, + uint64_t relayd_id, + enum lttng_event_output output, + uint64_t tracefile_size, + uint64_t tracefile_count, + uint64_t session_id_per_pid, + unsigned int monitor, + unsigned int live_timer_interval, + const char *root_shm_path, + const char *shm_path) +{ + struct lttng_consumer_channel *channel; + + channel = zmalloc(sizeof(*channel)); + if (channel == NULL) { + PERROR("malloc struct lttng_consumer_channel"); + goto end; + } + + channel->key = key; + channel->refcount = 0; + channel->session_id = session_id; + channel->session_id_per_pid = session_id_per_pid; + channel->uid = uid; + channel->gid = gid; + channel->relayd_id = relayd_id; + channel->tracefile_size = tracefile_size; + channel->tracefile_count = tracefile_count; + channel->monitor = monitor; + channel->live_timer_interval = live_timer_interval; + pthread_mutex_init(&channel->lock, NULL); + pthread_mutex_init(&channel->timer_lock, NULL); + + switch (output) { + case LTTNG_EVENT_SPLICE: + channel->output = CONSUMER_CHANNEL_SPLICE; + break; + case LTTNG_EVENT_MMAP: + channel->output = CONSUMER_CHANNEL_MMAP; + break; + default: + assert(0); + free(channel); + channel = NULL; + goto end; + } + + /* + * In monitor mode, the streams associated with the channel will be put in + * a special list ONLY owned by this channel. So, the refcount is set to 1 + * here meaning that the channel itself has streams that are referenced. + * + * On a channel deletion, once the channel is no longer visible, the + * refcount is decremented and checked for a zero value to delete it. With + * streams in no monitor mode, it will now be safe to destroy the channel. + */ + if (!channel->monitor) { + channel->refcount = 1; + } + + strncpy(channel->pathname, pathname, sizeof(channel->pathname)); + channel->pathname[sizeof(channel->pathname) - 1] = '\0'; + + strncpy(channel->name, name, sizeof(channel->name)); + channel->name[sizeof(channel->name) - 1] = '\0'; + + if (root_shm_path) { + strncpy(channel->root_shm_path, root_shm_path, sizeof(channel->root_shm_path)); + channel->root_shm_path[sizeof(channel->root_shm_path) - 1] = '\0'; + } + if (shm_path) { + strncpy(channel->shm_path, shm_path, sizeof(channel->shm_path)); + channel->shm_path[sizeof(channel->shm_path) - 1] = '\0'; + } + + lttng_ht_node_init_u64(&channel->node, channel->key); + + channel->wait_fd = -1; + + CDS_INIT_LIST_HEAD(&channel->streams.head); + + DBG("Allocated channel (key %" PRIu64 ")", channel->key) + +end: + return channel; +} + +/* + * Add a channel to the global list protected by a mutex. + * + * Always return 0 indicating success. + */ +int consumer_add_channel(struct lttng_consumer_channel *channel, + struct lttng_consumer_local_data *ctx) +{ + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&channel->lock); + pthread_mutex_lock(&channel->timer_lock); + + /* + * This gives us a guarantee that the channel we are about to add to the + * channel hash table will be unique. See this function comment on the why + * we need to steel the channel key at this stage. + */ + steal_channel_key(channel->key); + + rcu_read_lock(); + lttng_ht_add_unique_u64(consumer_data.channel_ht, &channel->node); + rcu_read_unlock(); + + pthread_mutex_unlock(&channel->timer_lock); + pthread_mutex_unlock(&channel->lock); + pthread_mutex_unlock(&consumer_data.lock); + + if (channel->wait_fd != -1 && channel->type == CONSUMER_CHANNEL_TYPE_DATA) { + notify_channel_pipe(ctx, channel, -1, CONSUMER_CHANNEL_ADD); + } + + return 0; +} + +/* + * Allocate the pollfd structure and the local view of the out fds to avoid + * doing a lookup in the linked list and concurrency issues when writing is + * needed. Called with consumer_data.lock held. + * + * Returns the number of fds in the structures. + */ +static int update_poll_array(struct lttng_consumer_local_data *ctx, + struct pollfd **pollfd, struct lttng_consumer_stream **local_stream, + struct lttng_ht *ht) +{ + int i = 0; + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + assert(ctx); + assert(ht); + assert(pollfd); + assert(local_stream); + + DBG("Updating poll fd array"); + rcu_read_lock(); + cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { + /* + * Only active streams with an active end point can be added to the + * poll set and local stream storage of the thread. + * + * There is a potential race here for endpoint_status to be updated + * just after the check. However, this is OK since the stream(s) will + * be deleted once the thread is notified that the end point state has + * changed where this function will be called back again. + */ + if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM || + stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) { + continue; + } + /* + * This clobbers way too much the debug output. Uncomment that if you + * need it for debugging purposes. + * + * DBG("Active FD %d", stream->wait_fd); + */ + (*pollfd)[i].fd = stream->wait_fd; + (*pollfd)[i].events = POLLIN | POLLPRI; + local_stream[i] = stream; + i++; + } + rcu_read_unlock(); + + /* + * Insert the consumer_data_pipe at the end of the array and don't + * increment i so nb_fd is the number of real FD. + */ + (*pollfd)[i].fd = lttng_pipe_get_readfd(ctx->consumer_data_pipe); + (*pollfd)[i].events = POLLIN | POLLPRI; + + (*pollfd)[i + 1].fd = lttng_pipe_get_readfd(ctx->consumer_wakeup_pipe); + (*pollfd)[i + 1].events = POLLIN | POLLPRI; + return i; +} + +/* + * Poll on the should_quit pipe and the command socket return -1 on + * error, 1 if should exit, 0 if data is available on the command socket + */ +int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) +{ + int num_rdy; + +restart: + num_rdy = poll(consumer_sockpoll, 2, -1); + if (num_rdy == -1) { + /* + * Restart interrupted system call. + */ + if (errno == EINTR) { + goto restart; + } + PERROR("Poll error"); + return -1; + } + if (consumer_sockpoll[0].revents & (POLLIN | POLLPRI)) { + DBG("consumer_should_quit wake up"); + return 1; + } + return 0; +} + +/* + * Set the error socket. + */ +void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, + int sock) +{ + ctx->consumer_error_socket = sock; +} + +/* + * Set the command socket path. + */ +void lttng_consumer_set_command_sock_path( + struct lttng_consumer_local_data *ctx, char *sock) +{ + ctx->consumer_command_sock_path = sock; +} + +/* + * Send return code to the session daemon. + * If the socket is not defined, we return 0, it is not a fatal error + */ +int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd) +{ + if (ctx->consumer_error_socket > 0) { + return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, + sizeof(enum lttcomm_sessiond_command)); + } + + return 0; +} + +/* + * Close all the tracefiles and stream fds and MUST be called when all + * instances are destroyed i.e. when all threads were joined and are ended. + */ +void lttng_consumer_cleanup(void) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_channel *channel; + + rcu_read_lock(); + + cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, channel, + node.node) { + consumer_del_channel(channel); + } + + rcu_read_unlock(); + + lttng_ht_destroy(consumer_data.channel_ht); + + cleanup_relayd_ht(); + + lttng_ht_destroy(consumer_data.stream_per_chan_id_ht); + + /* + * This HT contains streams that are freed by either the metadata thread or + * the data thread so we do *nothing* on the hash table and simply destroy + * it. + */ + lttng_ht_destroy(consumer_data.stream_list_ht); +} + +/* + * Called from signal handler. + */ +void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) +{ + ssize_t ret; + + consumer_quit = 1; + ret = lttng_write(ctx->consumer_should_quit[1], "4", 1); + if (ret < 1) { + PERROR("write consumer quit"); + } + + DBG("Consumer flag that it should quit"); +} + +void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, + off_t orig_offset) +{ + int outfd = stream->out_fd; + + /* + * This does a blocking write-and-wait on any page that belongs to the + * subbuffer prior to the one we just wrote. + * Don't care about error values, as these are just hints and ways to + * limit the amount of page cache used. + */ + if (orig_offset < stream->max_sb_size) { + return; + } + lttng_sync_file_range(outfd, orig_offset - stream->max_sb_size, + stream->max_sb_size, + SYNC_FILE_RANGE_WAIT_BEFORE + | SYNC_FILE_RANGE_WRITE + | SYNC_FILE_RANGE_WAIT_AFTER); + /* + * Give hints to the kernel about how we access the file: + * POSIX_FADV_DONTNEED : we won't re-access data in a near future after + * we write it. + * + * We need to call fadvise again after the file grows because the + * kernel does not seem to apply fadvise to non-existing parts of the + * file. + * + * Call fadvise _after_ having waited for the page writeback to + * complete because the dirty page writeback semantic is not well + * defined. So it can be expected to lead to lower throughput in + * streaming. + */ + posix_fadvise(outfd, orig_offset - stream->max_sb_size, + stream->max_sb_size, POSIX_FADV_DONTNEED); +} + +/* + * Initialise the necessary environnement : + * - create a new context + * - create the poll_pipe + * - create the should_quit pipe (for signal handler) + * - create the thread pipe (for splice) + * + * Takes a function pointer as argument, this function is called when data is + * available on a buffer. This function is responsible to do the + * kernctl_get_next_subbuf, read the data with mmap or splice depending on the + * buffer configuration and then kernctl_put_next_subbuf at the end. + * + * Returns a pointer to the new context or NULL on error. + */ +struct lttng_consumer_local_data *lttng_consumer_create( + enum lttng_consumer_type type, + ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, + struct lttng_consumer_local_data *ctx), + int (*recv_channel)(struct lttng_consumer_channel *channel), + int (*recv_stream)(struct lttng_consumer_stream *stream), + int (*update_stream)(uint64_t stream_key, uint32_t state)) +{ + int ret; + struct lttng_consumer_local_data *ctx; + + assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || + consumer_data.type == type); + consumer_data.type = type; + + ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); + if (ctx == NULL) { + PERROR("allocating context"); + goto error; + } + + ctx->consumer_error_socket = -1; + ctx->consumer_metadata_socket = -1; + pthread_mutex_init(&ctx->metadata_socket_lock, NULL); + /* assign the callbacks */ + ctx->on_buffer_ready = buffer_ready; + ctx->on_recv_channel = recv_channel; + ctx->on_recv_stream = recv_stream; + ctx->on_update_stream = update_stream; + + ctx->consumer_data_pipe = lttng_pipe_open(0); + if (!ctx->consumer_data_pipe) { + goto error_poll_pipe; + } + + ctx->consumer_wakeup_pipe = lttng_pipe_open(0); + if (!ctx->consumer_wakeup_pipe) { + goto error_wakeup_pipe; + } + + ret = pipe(ctx->consumer_should_quit); + if (ret < 0) { + PERROR("Error creating recv pipe"); + goto error_quit_pipe; + } + + ret = pipe(ctx->consumer_channel_pipe); + if (ret < 0) { + PERROR("Error creating channel pipe"); + goto error_channel_pipe; + } + + ctx->consumer_metadata_pipe = lttng_pipe_open(0); + if (!ctx->consumer_metadata_pipe) { + goto error_metadata_pipe; + } + + return ctx; + +error_metadata_pipe: + utils_close_pipe(ctx->consumer_channel_pipe); +error_channel_pipe: + utils_close_pipe(ctx->consumer_should_quit); +error_quit_pipe: + lttng_pipe_destroy(ctx->consumer_wakeup_pipe); +error_wakeup_pipe: + lttng_pipe_destroy(ctx->consumer_data_pipe); +error_poll_pipe: + free(ctx); +error: + return NULL; +} + +/* + * Iterate over all streams of the hashtable and free them properly. + */ +static void destroy_data_stream_ht(struct lttng_ht *ht) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + if (ht == NULL) { + return; + } + + rcu_read_lock(); + cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { + /* + * Ignore return value since we are currently cleaning up so any error + * can't be handled. + */ + (void) consumer_del_stream(stream, ht); + } + rcu_read_unlock(); + + lttng_ht_destroy(ht); +} + +/* + * Iterate over all streams of the metadata hashtable and free them + * properly. + */ +static void destroy_metadata_stream_ht(struct lttng_ht *ht) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + if (ht == NULL) { + return; + } + + rcu_read_lock(); + cds_lfht_for_each_entry(ht->ht, &iter.iter, stream, node.node) { + /* + * Ignore return value since we are currently cleaning up so any error + * can't be handled. + */ + (void) consumer_del_metadata_stream(stream, ht); + } + rcu_read_unlock(); + + lttng_ht_destroy(ht); +} + +/* + * Close all fds associated with the instance and free the context. + */ +void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) +{ + int ret; + + DBG("Consumer destroying it. Closing everything."); + + if (!ctx) { + return; + } + + destroy_data_stream_ht(data_ht); + destroy_metadata_stream_ht(metadata_ht); + + ret = close(ctx->consumer_error_socket); + if (ret) { + PERROR("close"); + } + ret = close(ctx->consumer_metadata_socket); + if (ret) { + PERROR("close"); + } + utils_close_pipe(ctx->consumer_channel_pipe); + lttng_pipe_destroy(ctx->consumer_data_pipe); + lttng_pipe_destroy(ctx->consumer_metadata_pipe); + lttng_pipe_destroy(ctx->consumer_wakeup_pipe); + utils_close_pipe(ctx->consumer_should_quit); + + unlink(ctx->consumer_command_sock_path); + free(ctx); +} + +/* + * Write the metadata stream id on the specified file descriptor. + */ +static int write_relayd_metadata_id(int fd, + struct lttng_consumer_stream *stream, + struct consumer_relayd_sock_pair *relayd, unsigned long padding) +{ + ssize_t ret; + struct lttcomm_relayd_metadata_payload hdr; + + hdr.stream_id = htobe64(stream->relayd_stream_id); + hdr.padding_size = htobe32(padding); + ret = lttng_write(fd, (void *) &hdr, sizeof(hdr)); + if (ret < sizeof(hdr)) { + /* + * This error means that the fd's end is closed so ignore the PERROR + * not to clubber the error output since this can happen in a normal + * code path. + */ + if (errno != EPIPE) { + PERROR("write metadata stream id"); + } + DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno); + /* + * Set ret to a negative value because if ret != sizeof(hdr), we don't + * handle writting the missing part so report that as an error and + * don't lie to the caller. + */ + ret = -1; + goto end; + } + DBG("Metadata stream id %" PRIu64 " with padding %lu written before data", + stream->relayd_stream_id, padding); + +end: + return (int) ret; +} + +/* + * Mmap the ring buffer, read it and write the data to the tracefile. This is a + * core function for writing trace buffers to either the local filesystem or + * the network. + * + * It must be called with the stream lock held. + * + * Careful review MUST be put if any changes occur! + * + * Returns the number of bytes written + */ +ssize_t lttng_consumer_on_read_subbuffer_mmap( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, unsigned long len, + unsigned long padding, + struct ctf_packet_index *index) +{ + unsigned long mmap_offset; + void *mmap_base; + ssize_t ret = 0; + off_t orig_offset = stream->out_fd_offset; + /* Default is on the disk */ + int outfd = stream->out_fd; + struct consumer_relayd_sock_pair *relayd = NULL; + unsigned int relayd_hang_up = 0; + + /* RCU lock for the relayd pointer */ + rcu_read_lock(); + + /* Flag that the current stream if set for network streaming. */ + if (stream->net_seq_idx != (uint64_t) -1ULL) { + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd == NULL) { + ret = -EPIPE; + goto end; + } + } + + /* get the offset inside the fd to mmap */ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + mmap_base = stream->mmap_base; + ret = kernctl_get_mmap_read_offset(stream->wait_fd, &mmap_offset); + if (ret < 0) { + ret = -errno; + PERROR("tracer ctl get_mmap_read_offset"); + goto end; + } + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + mmap_base = lttng_ustctl_get_mmap_base(stream); + if (!mmap_base) { + ERR("read mmap get mmap base for stream %s", stream->name); + ret = -EPERM; + goto end; + } + ret = lttng_ustctl_get_mmap_read_offset(stream, &mmap_offset); + if (ret != 0) { + PERROR("tracer ctl get_mmap_read_offset"); + ret = -EINVAL; + goto end; + } + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + } + + /* Handle stream on the relayd if the output is on the network */ + if (relayd) { + unsigned long netlen = len; + + /* + * Lock the control socket for the complete duration of the function + * since from this point on we will use the socket. + */ + if (stream->metadata_flag) { + /* Metadata requires the control socket. */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + netlen += sizeof(struct lttcomm_relayd_metadata_payload); + } + + ret = write_relayd_stream_header(stream, netlen, padding, relayd); + if (ret < 0) { + relayd_hang_up = 1; + goto write_error; + } + /* Use the returned socket. */ + outfd = ret; + + /* Write metadata stream id before payload */ + if (stream->metadata_flag) { + ret = write_relayd_metadata_id(outfd, stream, relayd, padding); + if (ret < 0) { + relayd_hang_up = 1; + goto write_error; + } + } + } else { + /* No streaming, we have to set the len with the full padding */ + len += padding; + + /* + * Check if we need to change the tracefile before writing the packet. + */ + if (stream->chan->tracefile_size > 0 && + (stream->tracefile_size_current + len) > + stream->chan->tracefile_size) { + ret = utils_rotate_stream_file(stream->chan->pathname, + stream->name, stream->chan->tracefile_size, + stream->chan->tracefile_count, stream->uid, stream->gid, + stream->out_fd, &(stream->tracefile_count_current), + &stream->out_fd); + if (ret < 0) { + ERR("Rotating output file"); + goto end; + } + outfd = stream->out_fd; + + if (stream->index_fd >= 0) { + ret = index_create_file(stream->chan->pathname, + stream->name, stream->uid, stream->gid, + stream->chan->tracefile_size, + stream->tracefile_count_current); + if (ret < 0) { + goto end; + } + stream->index_fd = ret; + } + + /* Reset current size because we just perform a rotation. */ + stream->tracefile_size_current = 0; + stream->out_fd_offset = 0; + orig_offset = 0; + } + stream->tracefile_size_current += len; + if (index) { + index->offset = htobe64(stream->out_fd_offset); + } + } + + /* + * This call guarantee that len or less is returned. It's impossible to + * receive a ret value that is bigger than len. + */ + ret = lttng_write(outfd, mmap_base + mmap_offset, len); + DBG("Consumer mmap write() ret %zd (len %lu)", ret, len); + if (ret < 0 || ((size_t) ret != len)) { + /* + * Report error to caller if nothing was written else at least send the + * amount written. + */ + if (ret < 0) { + ret = -errno; + } + relayd_hang_up = 1; + + /* Socket operation failed. We consider the relayd dead */ + if (errno == EPIPE || errno == EINVAL || errno == EBADF) { + /* + * This is possible if the fd is closed on the other side + * (outfd) or any write problem. It can be verbose a bit for a + * normal execution if for instance the relayd is stopped + * abruptly. This can happen so set this to a DBG statement. + */ + DBG("Consumer mmap write detected relayd hang up"); + } else { + /* Unhandled error, print it and stop function right now. */ + PERROR("Error in write mmap (ret %zd != len %lu)", ret, len); + } + goto write_error; + } + stream->output_written += ret; + + /* This call is useless on a socket so better save a syscall. */ + if (!relayd) { + /* This won't block, but will start writeout asynchronously */ + lttng_sync_file_range(outfd, stream->out_fd_offset, len, + SYNC_FILE_RANGE_WRITE); + stream->out_fd_offset += len; + } + lttng_consumer_sync_trace_file(stream, orig_offset); + +write_error: + /* + * This is a special case that the relayd has closed its socket. Let's + * cleanup the relayd object and all associated streams. + */ + if (relayd && relayd_hang_up) { + cleanup_relayd(relayd, ctx); + } + +end: + /* Unlock only if ctrl socket used */ + if (relayd && stream->metadata_flag) { + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + } + + rcu_read_unlock(); + return ret; +} + +/* + * Splice the data from the ring buffer to the tracefile. + * + * It must be called with the stream lock held. + * + * Returns the number of bytes spliced. + */ +ssize_t lttng_consumer_on_read_subbuffer_splice( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, unsigned long len, + unsigned long padding, + struct ctf_packet_index *index) +{ + ssize_t ret = 0, written = 0, ret_splice = 0; + loff_t offset = 0; + off_t orig_offset = stream->out_fd_offset; + int fd = stream->wait_fd; + /* Default is on the disk */ + int outfd = stream->out_fd; + struct consumer_relayd_sock_pair *relayd = NULL; + int *splice_pipe; + unsigned int relayd_hang_up = 0; + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + /* Not supported for user space tracing */ + return -ENOSYS; + default: + ERR("Unknown consumer_data type"); + assert(0); + } + + /* RCU lock for the relayd pointer */ + rcu_read_lock(); + + /* Flag that the current stream if set for network streaming. */ + if (stream->net_seq_idx != (uint64_t) -1ULL) { + relayd = consumer_find_relayd(stream->net_seq_idx); + if (relayd == NULL) { + written = -ret; + goto end; + } + } + splice_pipe = stream->splice_pipe; + + /* Write metadata stream id before payload */ + if (relayd) { + unsigned long total_len = len; + + if (stream->metadata_flag) { + /* + * Lock the control socket for the complete duration of the function + * since from this point on we will use the socket. + */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + + ret = write_relayd_metadata_id(splice_pipe[1], stream, relayd, + padding); + if (ret < 0) { + written = ret; + relayd_hang_up = 1; + goto write_error; + } + + total_len += sizeof(struct lttcomm_relayd_metadata_payload); + } + + ret = write_relayd_stream_header(stream, total_len, padding, relayd); + if (ret < 0) { + written = ret; + relayd_hang_up = 1; + goto write_error; + } + /* Use the returned socket. */ + outfd = ret; + } else { + /* No streaming, we have to set the len with the full padding */ + len += padding; + + /* + * Check if we need to change the tracefile before writing the packet. + */ + if (stream->chan->tracefile_size > 0 && + (stream->tracefile_size_current + len) > + stream->chan->tracefile_size) { + ret = utils_rotate_stream_file(stream->chan->pathname, + stream->name, stream->chan->tracefile_size, + stream->chan->tracefile_count, stream->uid, stream->gid, + stream->out_fd, &(stream->tracefile_count_current), + &stream->out_fd); + if (ret < 0) { + written = ret; + ERR("Rotating output file"); + goto end; + } + outfd = stream->out_fd; + + if (stream->index_fd >= 0) { + ret = index_create_file(stream->chan->pathname, + stream->name, stream->uid, stream->gid, + stream->chan->tracefile_size, + stream->tracefile_count_current); + if (ret < 0) { + written = ret; + goto end; + } + stream->index_fd = ret; + } + + /* Reset current size because we just perform a rotation. */ + stream->tracefile_size_current = 0; + stream->out_fd_offset = 0; + orig_offset = 0; + } + stream->tracefile_size_current += len; + index->offset = htobe64(stream->out_fd_offset); + } + + while (len > 0) { + DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)", + (unsigned long)offset, len, fd, splice_pipe[1]); + ret_splice = splice(fd, &offset, splice_pipe[1], NULL, len, + SPLICE_F_MOVE | SPLICE_F_MORE); + DBG("splice chan to pipe, ret %zd", ret_splice); + if (ret_splice < 0) { + ret = errno; + written = -ret; + PERROR("Error in relay splice"); + goto splice_error; + } + + /* Handle stream on the relayd if the output is on the network */ + if (relayd && stream->metadata_flag) { + size_t metadata_payload_size = + sizeof(struct lttcomm_relayd_metadata_payload); + + /* Update counter to fit the spliced data */ + ret_splice += metadata_payload_size; + len += metadata_payload_size; + /* + * We do this so the return value can match the len passed as + * argument to this function. + */ + written -= metadata_payload_size; + } + + /* Splice data out */ + ret_splice = splice(splice_pipe[0], NULL, outfd, NULL, + ret_splice, SPLICE_F_MOVE | SPLICE_F_MORE); + DBG("Consumer splice pipe to file (out_fd: %d), ret %zd", + outfd, ret_splice); + if (ret_splice < 0) { + ret = errno; + written = -ret; + relayd_hang_up = 1; + goto write_error; + } else if (ret_splice > len) { + /* + * We don't expect this code path to be executed but you never know + * so this is an extra protection agains a buggy splice(). + */ + ret = errno; + written += ret_splice; + PERROR("Wrote more data than requested %zd (len: %lu)", ret_splice, + len); + goto splice_error; + } else { + /* All good, update current len and continue. */ + len -= ret_splice; + } + + /* This call is useless on a socket so better save a syscall. */ + if (!relayd) { + /* This won't block, but will start writeout asynchronously */ + lttng_sync_file_range(outfd, stream->out_fd_offset, ret_splice, + SYNC_FILE_RANGE_WRITE); + stream->out_fd_offset += ret_splice; + } + stream->output_written += ret_splice; + written += ret_splice; + } + lttng_consumer_sync_trace_file(stream, orig_offset); + goto end; + +write_error: + /* + * This is a special case that the relayd has closed its socket. Let's + * cleanup the relayd object and all associated streams. + */ + if (relayd && relayd_hang_up) { + cleanup_relayd(relayd, ctx); + /* Skip splice error so the consumer does not fail */ + goto end; + } + +splice_error: + /* send the appropriate error description to sessiond */ + switch (ret) { + case EINVAL: + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_EINVAL); + break; + case ENOMEM: + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ENOMEM); + break; + case ESPIPE: + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_SPLICE_ESPIPE); + break; + } + +end: + if (relayd && stream->metadata_flag) { + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + } + + rcu_read_unlock(); + return written; +} + +/* + * Take a snapshot for a specific fd + * + * Returns 0 on success, < 0 on error + */ +int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream) +{ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + return lttng_kconsumer_take_snapshot(stream); + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + return lttng_ustconsumer_take_snapshot(stream); + default: + ERR("Unknown consumer_data type"); + assert(0); + return -ENOSYS; + } +} + +/* + * Get the produced position + * + * Returns 0 on success, < 0 on error + */ +int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, + unsigned long *pos) +{ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + return lttng_kconsumer_get_produced_snapshot(stream, pos); + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + return lttng_ustconsumer_get_produced_snapshot(stream, pos); + default: + ERR("Unknown consumer_data type"); + assert(0); + return -ENOSYS; + } +} + +int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, + int sock, struct pollfd *consumer_sockpoll) +{ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); + default: + ERR("Unknown consumer_data type"); + assert(0); + return -ENOSYS; + } +} + +void lttng_consumer_close_all_metadata(void) +{ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + /* + * The Kernel consumer has a different metadata scheme so we don't + * close anything because the stream will be closed by the session + * daemon. + */ + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + /* + * Close all metadata streams. The metadata hash table is passed and + * this call iterates over it by closing all wakeup fd. This is safe + * because at this point we are sure that the metadata producer is + * either dead or blocked. + */ + lttng_ustconsumer_close_all_metadata(metadata_ht); + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + } +} + +/* + * Clean up a metadata stream and free its memory. + */ +void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, + struct lttng_ht *ht) +{ + struct lttng_consumer_channel *free_chan = NULL; + + assert(stream); + /* + * This call should NEVER receive regular stream. It must always be + * metadata stream and this is crucial for data structure synchronization. + */ + assert(stream->metadata_flag); + + DBG3("Consumer delete metadata stream %d", stream->wait_fd); + + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&stream->chan->lock); + pthread_mutex_lock(&stream->lock); + + /* Remove any reference to that stream. */ + consumer_stream_delete(stream, ht); + + /* Close down everything including the relayd if one. */ + consumer_stream_close(stream); + /* Destroy tracer buffers of the stream. */ + consumer_stream_destroy_buffers(stream); + + /* Atomically decrement channel refcount since other threads can use it. */ + if (!uatomic_sub_return(&stream->chan->refcount, 1) + && !uatomic_read(&stream->chan->nb_init_stream_left)) { + /* Go for channel deletion! */ + free_chan = stream->chan; + } + + /* + * Nullify the stream reference so it is not used after deletion. The + * channel lock MUST be acquired before being able to check for a NULL + * pointer value. + */ + stream->chan->metadata_stream = NULL; + + pthread_mutex_unlock(&stream->lock); + pthread_mutex_unlock(&stream->chan->lock); + pthread_mutex_unlock(&consumer_data.lock); + + if (free_chan) { + consumer_del_channel(free_chan); + } + + consumer_stream_free(stream); +} + +/* + * Action done with the metadata stream when adding it to the consumer internal + * data structures to handle it. + */ +int consumer_add_metadata_stream(struct lttng_consumer_stream *stream) +{ + struct lttng_ht *ht = metadata_ht; + int ret = 0; + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + + assert(stream); + assert(ht); + + DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key); + + pthread_mutex_lock(&consumer_data.lock); + pthread_mutex_lock(&stream->chan->lock); + pthread_mutex_lock(&stream->chan->timer_lock); + pthread_mutex_lock(&stream->lock); + + /* + * From here, refcounts are updated so be _careful_ when returning an error + * after this point. + */ + + rcu_read_lock(); + + /* + * Lookup the stream just to make sure it does not exist in our internal + * state. This should NEVER happen. + */ + lttng_ht_lookup(ht, &stream->key, &iter); + node = lttng_ht_iter_get_node_u64(&iter); + assert(!node); + + /* + * When nb_init_stream_left reaches 0, we don't need to trigger any action + * in terms of destroying the associated channel, because the action that + * causes the count to become 0 also causes a stream to be added. The + * channel deletion will thus be triggered by the following removal of this + * stream. + */ + if (uatomic_read(&stream->chan->nb_init_stream_left) > 0) { + /* Increment refcount before decrementing nb_init_stream_left */ + cmm_smp_wmb(); + uatomic_dec(&stream->chan->nb_init_stream_left); + } + + lttng_ht_add_unique_u64(ht, &stream->node); + + lttng_ht_add_unique_u64(consumer_data.stream_per_chan_id_ht, + &stream->node_channel_id); + + /* + * Add stream to the stream_list_ht of the consumer data. No need to steal + * the key since the HT does not use it and we allow to add redundant keys + * into this table. + */ + lttng_ht_add_u64(consumer_data.stream_list_ht, &stream->node_session_id); + + rcu_read_unlock(); + + pthread_mutex_unlock(&stream->lock); + pthread_mutex_unlock(&stream->chan->lock); + pthread_mutex_unlock(&stream->chan->timer_lock); + pthread_mutex_unlock(&consumer_data.lock); + return ret; +} + +/* + * Delete data stream that are flagged for deletion (endpoint_status). + */ +static void validate_endpoint_status_data_stream(void) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + DBG("Consumer delete flagged data stream"); + + rcu_read_lock(); + cds_lfht_for_each_entry(data_ht->ht, &iter.iter, stream, node.node) { + /* Validate delete flag of the stream */ + if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { + continue; + } + /* Delete it right now */ + consumer_del_stream(stream, data_ht); + } + rcu_read_unlock(); +} + +/* + * Delete metadata stream that are flagged for deletion (endpoint_status). + */ +static void validate_endpoint_status_metadata_stream( + struct lttng_poll_event *pollset) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_stream *stream; + + DBG("Consumer delete flagged metadata stream"); + + assert(pollset); + + rcu_read_lock(); + cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, node.node) { + /* Validate delete flag of the stream */ + if (stream->endpoint_status == CONSUMER_ENDPOINT_ACTIVE) { + continue; + } + /* + * Remove from pollset so the metadata thread can continue without + * blocking on a deleted stream. + */ + lttng_poll_del(pollset, stream->wait_fd); + + /* Delete it right now */ + consumer_del_metadata_stream(stream, metadata_ht); + } + rcu_read_unlock(); +} + +/* + * Thread polls on metadata file descriptor and write them on disk or on the + * network. + */ +void *consumer_thread_metadata_poll(void *data) +{ + int ret, i, pollfd, err = -1; + uint32_t revents, nb_fd; + struct lttng_consumer_stream *stream = NULL; + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + struct lttng_poll_event events; + struct lttng_consumer_local_data *ctx = data; + ssize_t len; + + rcu_register_thread(); + + health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_METADATA); + + if (testpoint(consumerd_thread_metadata)) { + goto error_testpoint; + } + + health_code_update(); + + DBG("Thread metadata poll started"); + + /* Size is set to 1 for the consumer_metadata pipe */ + ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); + if (ret < 0) { + ERR("Poll set creation failed"); + goto end_poll; + } + + ret = lttng_poll_add(&events, + lttng_pipe_get_readfd(ctx->consumer_metadata_pipe), LPOLLIN); + if (ret < 0) { + goto end; + } + + /* Main loop */ + DBG("Metadata main loop started"); + + while (1) { +restart: + health_code_update(); + health_poll_entry(); + DBG("Metadata poll wait"); + ret = lttng_poll_wait(&events, -1); + DBG("Metadata poll return from wait with %d fd(s)", + LTTNG_POLL_GETNB(&events)); + health_poll_exit(); + DBG("Metadata event catched in thread"); + if (ret < 0) { + if (errno == EINTR) { + ERR("Poll EINTR catched"); + goto restart; + } + if (LTTNG_POLL_GETNB(&events) == 0) { + err = 0; /* All is OK */ + } + goto end; + } + + nb_fd = ret; + + /* From here, the event is a metadata wait fd */ + for (i = 0; i < nb_fd; i++) { + health_code_update(); + + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + + if (pollfd == lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)) { + if (revents & LPOLLIN) { + ssize_t pipe_len; + + pipe_len = lttng_pipe_read(ctx->consumer_metadata_pipe, + &stream, sizeof(stream)); + if (pipe_len < sizeof(stream)) { + if (pipe_len < 0) { + PERROR("read metadata stream"); + } + /* + * Remove the pipe from the poll set and continue the loop + * since their might be data to consume. + */ + lttng_poll_del(&events, + lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); + lttng_pipe_read_close(ctx->consumer_metadata_pipe); + continue; + } + + /* A NULL stream means that the state has changed. */ + if (stream == NULL) { + /* Check for deleted streams. */ + validate_endpoint_status_metadata_stream(&events); + goto restart; + } + + DBG("Adding metadata stream %d to poll set", + stream->wait_fd); + + /* Add metadata stream to the global poll events list */ + lttng_poll_add(&events, stream->wait_fd, + LPOLLIN | LPOLLPRI | LPOLLHUP); + } else if (revents & (LPOLLERR | LPOLLHUP)) { + DBG("Metadata thread pipe hung up"); + /* + * Remove the pipe from the poll set and continue the loop + * since their might be data to consume. + */ + lttng_poll_del(&events, + lttng_pipe_get_readfd(ctx->consumer_metadata_pipe)); + lttng_pipe_read_close(ctx->consumer_metadata_pipe); + continue; + } else { + ERR("Unexpected poll events %u for sock %d", revents, pollfd); + goto end; + } + + /* Handle other stream */ + continue; + } + + rcu_read_lock(); + { + uint64_t tmp_id = (uint64_t) pollfd; + + lttng_ht_lookup(metadata_ht, &tmp_id, &iter); + } + node = lttng_ht_iter_get_node_u64(&iter); + assert(node); + + stream = caa_container_of(node, struct lttng_consumer_stream, + node); + + if (revents & (LPOLLIN | LPOLLPRI)) { + /* Get the data out of the metadata file descriptor */ + DBG("Metadata available on fd %d", pollfd); + assert(stream->wait_fd == pollfd); + + do { + health_code_update(); + + len = ctx->on_buffer_ready(stream, ctx); + /* + * We don't check the return value here since if we get + * a negative len, it means an error occured thus we + * simply remove it from the poll set and free the + * stream. + */ + } while (len > 0); + + /* It's ok to have an unavailable sub-buffer */ + if (len < 0 && len != -EAGAIN && len != -ENODATA) { + /* Clean up stream from consumer and free it. */ + lttng_poll_del(&events, stream->wait_fd); + consumer_del_metadata_stream(stream, metadata_ht); + } + } else if (revents & (LPOLLERR | LPOLLHUP)) { + DBG("Metadata fd %d is hup|err.", pollfd); + if (!stream->hangup_flush_done + && (consumer_data.type == LTTNG_CONSUMER32_UST + || consumer_data.type == LTTNG_CONSUMER64_UST)) { + DBG("Attempting to flush and consume the UST buffers"); + lttng_ustconsumer_on_stream_hangup(stream); + + /* We just flushed the stream now read it. */ + do { + health_code_update(); + + len = ctx->on_buffer_ready(stream, ctx); + /* + * We don't check the return value here since if we get + * a negative len, it means an error occured thus we + * simply remove it from the poll set and free the + * stream. + */ + } while (len > 0); + } + + lttng_poll_del(&events, stream->wait_fd); + /* + * This call update the channel states, closes file descriptors + * and securely free the stream. + */ + consumer_del_metadata_stream(stream, metadata_ht); + } else { + ERR("Unexpected poll events %u for sock %d", revents, pollfd); + rcu_read_unlock(); + goto end; + } + /* Release RCU lock for the stream looked up */ + rcu_read_unlock(); + } + } + + /* All is OK */ + err = 0; +end: + DBG("Metadata poll thread exiting"); + + lttng_poll_clean(&events); +end_poll: +error_testpoint: + if (err) { + health_error(); + ERR("Health error occurred in %s", __func__); + } + health_unregister(health_consumerd); + rcu_unregister_thread(); + return NULL; +} + +/* + * This thread polls the fds in the set to consume the data and write + * it to tracefile if necessary. + */ +void *consumer_thread_data_poll(void *data) +{ + int num_rdy, num_hup, high_prio, ret, i, err = -1; + struct pollfd *pollfd = NULL; + /* local view of the streams */ + struct lttng_consumer_stream **local_stream = NULL, *new_stream = NULL; + /* local view of consumer_data.fds_count */ + int nb_fd = 0; + struct lttng_consumer_local_data *ctx = data; + ssize_t len; + + rcu_register_thread(); + + health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_DATA); + + if (testpoint(consumerd_thread_data)) { + goto error_testpoint; + } + + health_code_update(); + + local_stream = zmalloc(sizeof(struct lttng_consumer_stream *)); + if (local_stream == NULL) { + PERROR("local_stream malloc"); + goto end; + } + + while (1) { + health_code_update(); + + high_prio = 0; + num_hup = 0; + + /* + * the fds set has been updated, we need to update our + * local array as well + */ + pthread_mutex_lock(&consumer_data.lock); + if (consumer_data.need_update) { + free(pollfd); + pollfd = NULL; + + free(local_stream); + local_stream = NULL; + + /* + * Allocate for all fds +1 for the consumer_data_pipe and +1 for + * wake up pipe. + */ + pollfd = zmalloc((consumer_data.stream_count + 2) * sizeof(struct pollfd)); + if (pollfd == NULL) { + PERROR("pollfd malloc"); + pthread_mutex_unlock(&consumer_data.lock); + goto end; + } + + local_stream = zmalloc((consumer_data.stream_count + 2) * + sizeof(struct lttng_consumer_stream *)); + if (local_stream == NULL) { + PERROR("local_stream malloc"); + pthread_mutex_unlock(&consumer_data.lock); + goto end; + } + ret = update_poll_array(ctx, &pollfd, local_stream, + data_ht); + if (ret < 0) { + ERR("Error in allocating pollfd or local_outfds"); + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); + pthread_mutex_unlock(&consumer_data.lock); + goto end; + } + nb_fd = ret; + consumer_data.need_update = 0; + } + pthread_mutex_unlock(&consumer_data.lock); + + /* No FDs and consumer_quit, consumer_cleanup the thread */ + if (nb_fd == 0 && consumer_quit == 1) { + err = 0; /* All is OK */ + goto end; + } + /* poll on the array of fds */ + restart: + DBG("polling on %d fd", nb_fd + 2); + health_poll_entry(); + num_rdy = poll(pollfd, nb_fd + 2, -1); + health_poll_exit(); + DBG("poll num_rdy : %d", num_rdy); + if (num_rdy == -1) { + /* + * Restart interrupted system call. + */ + if (errno == EINTR) { + goto restart; + } + PERROR("Poll error"); + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); + goto end; + } else if (num_rdy == 0) { + DBG("Polling thread timed out"); + goto end; + } + + /* + * If the consumer_data_pipe triggered poll go directly to the + * beginning of the loop to update the array. We want to prioritize + * array update over low-priority reads. + */ + if (pollfd[nb_fd].revents & (POLLIN | POLLPRI)) { + ssize_t pipe_readlen; + + DBG("consumer_data_pipe wake up"); + pipe_readlen = lttng_pipe_read(ctx->consumer_data_pipe, + &new_stream, sizeof(new_stream)); + if (pipe_readlen < sizeof(new_stream)) { + PERROR("Consumer data pipe"); + /* Continue so we can at least handle the current stream(s). */ + continue; + } + + /* + * If the stream is NULL, just ignore it. It's also possible that + * the sessiond poll thread changed the consumer_quit state and is + * waking us up to test it. + */ + if (new_stream == NULL) { + validate_endpoint_status_data_stream(); + continue; + } + + /* Continue to update the local streams and handle prio ones */ + continue; + } + + /* Handle wakeup pipe. */ + if (pollfd[nb_fd + 1].revents & (POLLIN | POLLPRI)) { + char dummy; + ssize_t pipe_readlen; + + pipe_readlen = lttng_pipe_read(ctx->consumer_wakeup_pipe, &dummy, + sizeof(dummy)); + if (pipe_readlen < 0) { + PERROR("Consumer data wakeup pipe"); + } + /* We've been awakened to handle stream(s). */ + ctx->has_wakeup = 0; + } + + /* Take care of high priority channels first. */ + for (i = 0; i < nb_fd; i++) { + health_code_update(); + + if (local_stream[i] == NULL) { + continue; + } + if (pollfd[i].revents & POLLPRI) { + DBG("Urgent read on fd %d", pollfd[i].fd); + high_prio = 1; + len = ctx->on_buffer_ready(local_stream[i], ctx); + /* it's ok to have an unavailable sub-buffer */ + if (len < 0 && len != -EAGAIN && len != -ENODATA) { + /* Clean the stream and free it. */ + consumer_del_stream(local_stream[i], data_ht); + local_stream[i] = NULL; + } else if (len > 0) { + local_stream[i]->data_read = 1; + } + } + } + + /* + * If we read high prio channel in this loop, try again + * for more high prio data. + */ + if (high_prio) { + continue; + } + + /* Take care of low priority channels. */ + for (i = 0; i < nb_fd; i++) { + health_code_update(); + + if (local_stream[i] == NULL) { + continue; + } + if ((pollfd[i].revents & POLLIN) || + local_stream[i]->hangup_flush_done || + local_stream[i]->has_data) { + DBG("Normal read on fd %d", pollfd[i].fd); + len = ctx->on_buffer_ready(local_stream[i], ctx); + /* it's ok to have an unavailable sub-buffer */ + if (len < 0 && len != -EAGAIN && len != -ENODATA) { + /* Clean the stream and free it. */ + consumer_del_stream(local_stream[i], data_ht); + local_stream[i] = NULL; + } else if (len > 0) { + local_stream[i]->data_read = 1; + } + } + } + + /* Handle hangup and errors */ + for (i = 0; i < nb_fd; i++) { + health_code_update(); + + if (local_stream[i] == NULL) { + continue; + } + if (!local_stream[i]->hangup_flush_done + && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) + && (consumer_data.type == LTTNG_CONSUMER32_UST + || consumer_data.type == LTTNG_CONSUMER64_UST)) { + DBG("fd %d is hup|err|nval. Attempting flush and read.", + pollfd[i].fd); + lttng_ustconsumer_on_stream_hangup(local_stream[i]); + /* Attempt read again, for the data we just flushed. */ + local_stream[i]->data_read = 1; + } + /* + * If the poll flag is HUP/ERR/NVAL and we have + * read no data in this pass, we can remove the + * stream from its hash table. + */ + if ((pollfd[i].revents & POLLHUP)) { + DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); + if (!local_stream[i]->data_read) { + consumer_del_stream(local_stream[i], data_ht); + local_stream[i] = NULL; + num_hup++; + } + } else if (pollfd[i].revents & POLLERR) { + ERR("Error returned in polling fd %d.", pollfd[i].fd); + if (!local_stream[i]->data_read) { + consumer_del_stream(local_stream[i], data_ht); + local_stream[i] = NULL; + num_hup++; + } + } else if (pollfd[i].revents & POLLNVAL) { + ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); + if (!local_stream[i]->data_read) { + consumer_del_stream(local_stream[i], data_ht); + local_stream[i] = NULL; + num_hup++; + } + } + if (local_stream[i] != NULL) { + local_stream[i]->data_read = 0; + } + } + } + /* All is OK */ + err = 0; +end: + DBG("polling thread exiting"); + free(pollfd); + free(local_stream); + + /* + * Close the write side of the pipe so epoll_wait() in + * consumer_thread_metadata_poll can catch it. The thread is monitoring the + * read side of the pipe. If we close them both, epoll_wait strangely does + * not return and could create a endless wait period if the pipe is the + * only tracked fd in the poll set. The thread will take care of closing + * the read side. + */ + (void) lttng_pipe_write_close(ctx->consumer_metadata_pipe); + +error_testpoint: + if (err) { + health_error(); + ERR("Health error occurred in %s", __func__); + } + health_unregister(health_consumerd); + + rcu_unregister_thread(); + return NULL; +} + +/* + * Close wake-up end of each stream belonging to the channel. This will + * allow the poll() on the stream read-side to detect when the + * write-side (application) finally closes them. + */ +static +void consumer_close_channel_streams(struct lttng_consumer_channel *channel) +{ + struct lttng_ht *ht; + struct lttng_consumer_stream *stream; + struct lttng_ht_iter iter; + + ht = consumer_data.stream_per_chan_id_ht; + + rcu_read_lock(); + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&channel->key, lttng_ht_seed), + ht->match_fct, &channel->key, + &iter.iter, stream, node_channel_id.node) { + /* + * Protect against teardown with mutex. + */ + pthread_mutex_lock(&stream->lock); + if (cds_lfht_is_node_deleted(&stream->node.node)) { + goto next; + } + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + if (stream->metadata_flag) { + /* Safe and protected by the stream lock. */ + lttng_ustconsumer_close_metadata(stream->chan); + } else { + /* + * Note: a mutex is taken internally within + * liblttng-ust-ctl to protect timer wakeup_fd + * use from concurrent close. + */ + lttng_ustconsumer_close_stream_wakeup(stream); + } + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + } + next: + pthread_mutex_unlock(&stream->lock); + } + rcu_read_unlock(); +} + +static void destroy_channel_ht(struct lttng_ht *ht) +{ + struct lttng_ht_iter iter; + struct lttng_consumer_channel *channel; + int ret; + + if (ht == NULL) { + return; + } + + rcu_read_lock(); + cds_lfht_for_each_entry(ht->ht, &iter.iter, channel, wait_fd_node.node) { + ret = lttng_ht_del(ht, &iter); + assert(ret != 0); + } + rcu_read_unlock(); + + lttng_ht_destroy(ht); +} + +/* + * This thread polls the channel fds to detect when they are being + * closed. It closes all related streams if the channel is detected as + * closed. It is currently only used as a shim layer for UST because the + * consumerd needs to keep the per-stream wakeup end of pipes open for + * periodical flush. + */ +void *consumer_thread_channel_poll(void *data) +{ + int ret, i, pollfd, err = -1; + uint32_t revents, nb_fd; + struct lttng_consumer_channel *chan = NULL; + struct lttng_ht_iter iter; + struct lttng_ht_node_u64 *node; + struct lttng_poll_event events; + struct lttng_consumer_local_data *ctx = data; + struct lttng_ht *channel_ht; + + rcu_register_thread(); + + health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_CHANNEL); + + if (testpoint(consumerd_thread_channel)) { + goto error_testpoint; + } + + health_code_update(); + + channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!channel_ht) { + /* ENOMEM at this point. Better to bail out. */ + goto end_ht; + } + + DBG("Thread channel poll started"); + + /* Size is set to 1 for the consumer_channel pipe */ + ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); + if (ret < 0) { + ERR("Poll set creation failed"); + goto end_poll; + } + + ret = lttng_poll_add(&events, ctx->consumer_channel_pipe[0], LPOLLIN); + if (ret < 0) { + goto end; + } + + /* Main loop */ + DBG("Channel main loop started"); + + while (1) { +restart: + health_code_update(); + DBG("Channel poll wait"); + health_poll_entry(); + ret = lttng_poll_wait(&events, -1); + DBG("Channel poll return from wait with %d fd(s)", + LTTNG_POLL_GETNB(&events)); + health_poll_exit(); + DBG("Channel event catched in thread"); + if (ret < 0) { + if (errno == EINTR) { + ERR("Poll EINTR catched"); + goto restart; + } + if (LTTNG_POLL_GETNB(&events) == 0) { + err = 0; /* All is OK */ + } + goto end; + } + + nb_fd = ret; + + /* From here, the event is a channel wait fd */ + for (i = 0; i < nb_fd; i++) { + health_code_update(); + + revents = LTTNG_POLL_GETEV(&events, i); + pollfd = LTTNG_POLL_GETFD(&events, i); + + if (!revents) { + /* No activity for this FD (poll implementation). */ + continue; + } + + if (pollfd == ctx->consumer_channel_pipe[0]) { + if (revents & LPOLLIN) { + enum consumer_channel_action action; + uint64_t key; + + ret = read_channel_pipe(ctx, &chan, &key, &action); + if (ret <= 0) { + if (ret < 0) { + ERR("Error reading channel pipe"); + } + lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); + continue; + } + + switch (action) { + case CONSUMER_CHANNEL_ADD: + DBG("Adding channel %d to poll set", + chan->wait_fd); + + lttng_ht_node_init_u64(&chan->wait_fd_node, + chan->wait_fd); + rcu_read_lock(); + lttng_ht_add_unique_u64(channel_ht, + &chan->wait_fd_node); + rcu_read_unlock(); + /* Add channel to the global poll events list */ + lttng_poll_add(&events, chan->wait_fd, + LPOLLERR | LPOLLHUP); + break; + case CONSUMER_CHANNEL_DEL: + { + /* + * This command should never be called if the channel + * has streams monitored by either the data or metadata + * thread. The consumer only notify this thread with a + * channel del. command if it receives a destroy + * channel command from the session daemon that send it + * if a command prior to the GET_CHANNEL failed. + */ + + rcu_read_lock(); + chan = consumer_find_channel(key); + if (!chan) { + rcu_read_unlock(); + ERR("UST consumer get channel key %" PRIu64 " not found for del channel", key); + break; + } + lttng_poll_del(&events, chan->wait_fd); + iter.iter.node = &chan->wait_fd_node.node; + ret = lttng_ht_del(channel_ht, &iter); + assert(ret == 0); + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + health_code_update(); + /* Destroy streams that might have been left in the stream list. */ + clean_channel_stream_list(chan); + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + } + + /* + * Release our own refcount. Force channel deletion even if + * streams were not initialized. + */ + if (!uatomic_sub_return(&chan->refcount, 1)) { + consumer_del_channel(chan); + } + rcu_read_unlock(); + goto restart; + } + case CONSUMER_CHANNEL_QUIT: + /* + * Remove the pipe from the poll set and continue the loop + * since their might be data to consume. + */ + lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); + continue; + default: + ERR("Unknown action"); + break; + } + } else if (revents & (LPOLLERR | LPOLLHUP)) { + DBG("Channel thread pipe hung up"); + /* + * Remove the pipe from the poll set and continue the loop + * since their might be data to consume. + */ + lttng_poll_del(&events, ctx->consumer_channel_pipe[0]); + continue; + } else { + ERR("Unexpected poll events %u for sock %d", revents, pollfd); + goto end; + } + + /* Handle other stream */ + continue; + } + + rcu_read_lock(); + { + uint64_t tmp_id = (uint64_t) pollfd; + + lttng_ht_lookup(channel_ht, &tmp_id, &iter); + } + node = lttng_ht_iter_get_node_u64(&iter); + assert(node); + + chan = caa_container_of(node, struct lttng_consumer_channel, + wait_fd_node); + + /* Check for error event */ + if (revents & (LPOLLERR | LPOLLHUP)) { + DBG("Channel fd %d is hup|err.", pollfd); + + lttng_poll_del(&events, chan->wait_fd); + ret = lttng_ht_del(channel_ht, &iter); + assert(ret == 0); + + /* + * This will close the wait fd for each stream associated to + * this channel AND monitored by the data/metadata thread thus + * will be clean by the right thread. + */ + consumer_close_channel_streams(chan); + + /* Release our own refcount */ + if (!uatomic_sub_return(&chan->refcount, 1) + && !uatomic_read(&chan->nb_init_stream_left)) { + consumer_del_channel(chan); + } + } else { + ERR("Unexpected poll events %u for sock %d", revents, pollfd); + rcu_read_unlock(); + goto end; + } + + /* Release RCU lock for the channel looked up */ + rcu_read_unlock(); + } + } + + /* All is OK */ + err = 0; +end: + lttng_poll_clean(&events); +end_poll: + destroy_channel_ht(channel_ht); +end_ht: +error_testpoint: + DBG("Channel poll thread exiting"); + if (err) { + health_error(); + ERR("Health error occurred in %s", __func__); + } + health_unregister(health_consumerd); + rcu_unregister_thread(); + return NULL; +} + +static int set_metadata_socket(struct lttng_consumer_local_data *ctx, + struct pollfd *sockpoll, int client_socket) +{ + int ret; + + assert(ctx); + assert(sockpoll); + + ret = lttng_consumer_poll_socket(sockpoll); + if (ret) { + goto error; + } + DBG("Metadata connection on client_socket"); + + /* Blocking call, waiting for transmission */ + ctx->consumer_metadata_socket = lttcomm_accept_unix_sock(client_socket); + if (ctx->consumer_metadata_socket < 0) { + WARN("On accept metadata"); + ret = -1; + goto error; + } + ret = 0; + +error: + return ret; +} + +/* + * This thread listens on the consumerd socket and receives the file + * descriptors from the session daemon. + */ +void *consumer_thread_sessiond_poll(void *data) +{ + int sock = -1, client_socket, ret, err = -1; + /* + * structure to poll for incoming data on communication socket avoids + * making blocking sockets. + */ + struct pollfd consumer_sockpoll[2]; + struct lttng_consumer_local_data *ctx = data; + + rcu_register_thread(); + + health_register(health_consumerd, HEALTH_CONSUMERD_TYPE_SESSIOND); + + if (testpoint(consumerd_thread_sessiond)) { + goto error_testpoint; + } + + health_code_update(); + + DBG("Creating command socket %s", ctx->consumer_command_sock_path); + unlink(ctx->consumer_command_sock_path); + client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); + if (client_socket < 0) { + ERR("Cannot create command socket"); + goto end; + } + + ret = lttcomm_listen_unix_sock(client_socket); + if (ret < 0) { + goto end; + } + + DBG("Sending ready command to lttng-sessiond"); + ret = lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY); + /* return < 0 on error, but == 0 is not fatal */ + if (ret < 0) { + ERR("Error sending ready command to lttng-sessiond"); + goto end; + } + + /* prepare the FDs to poll : to client socket and the should_quit pipe */ + consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; + consumer_sockpoll[0].events = POLLIN | POLLPRI; + consumer_sockpoll[1].fd = client_socket; + consumer_sockpoll[1].events = POLLIN | POLLPRI; + + ret = lttng_consumer_poll_socket(consumer_sockpoll); + if (ret) { + if (ret > 0) { + /* should exit */ + err = 0; + } + goto end; + } + DBG("Connection on client_socket"); + + /* Blocking call, waiting for transmission */ + sock = lttcomm_accept_unix_sock(client_socket); + if (sock < 0) { + WARN("On accept"); + goto end; + } + + /* + * Setup metadata socket which is the second socket connection on the + * command unix socket. + */ + ret = set_metadata_socket(ctx, consumer_sockpoll, client_socket); + if (ret) { + if (ret > 0) { + /* should exit */ + err = 0; + } + goto end; + } + + /* This socket is not useful anymore. */ + ret = close(client_socket); + if (ret < 0) { + PERROR("close client_socket"); + } + client_socket = -1; + + /* update the polling structure to poll on the established socket */ + consumer_sockpoll[1].fd = sock; + consumer_sockpoll[1].events = POLLIN | POLLPRI; + + while (1) { + health_code_update(); + + health_poll_entry(); + ret = lttng_consumer_poll_socket(consumer_sockpoll); + health_poll_exit(); + if (ret) { + if (ret > 0) { + /* should exit */ + err = 0; + } + goto end; + } + DBG("Incoming command on sock"); + ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); + if (ret <= 0) { + /* + * This could simply be a session daemon quitting. Don't output + * ERR() here. + */ + DBG("Communication interrupted on command socket"); + err = 0; + goto end; + } + if (consumer_quit) { + DBG("consumer_thread_receive_fds received quit from signal"); + err = 0; /* All is OK */ + goto end; + } + DBG("received command on sock"); + } + /* All is OK */ + err = 0; + +end: + DBG("Consumer thread sessiond poll exiting"); + + /* + * Close metadata streams since the producer is the session daemon which + * just died. + * + * NOTE: for now, this only applies to the UST tracer. + */ + lttng_consumer_close_all_metadata(); + + /* + * when all fds have hung up, the polling thread + * can exit cleanly + */ + consumer_quit = 1; + + /* + * Notify the data poll thread to poll back again and test the + * consumer_quit state that we just set so to quit gracefully. + */ + notify_thread_lttng_pipe(ctx->consumer_data_pipe); + + notify_channel_pipe(ctx, NULL, -1, CONSUMER_CHANNEL_QUIT); + + notify_health_quit_pipe(health_quit_pipe); + + /* Cleaning up possibly open sockets. */ + if (sock >= 0) { + ret = close(sock); + if (ret < 0) { + PERROR("close sock sessiond poll"); + } + } + if (client_socket >= 0) { + ret = close(client_socket); + if (ret < 0) { + PERROR("close client_socket sessiond poll"); + } + } + +error_testpoint: + if (err) { + health_error(); + ERR("Health error occurred in %s", __func__); + } + health_unregister(health_consumerd); + + rcu_unregister_thread(); + return NULL; +} + +ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, + struct lttng_consumer_local_data *ctx) +{ + ssize_t ret; + + pthread_mutex_lock(&stream->lock); + if (stream->metadata_flag) { + pthread_mutex_lock(&stream->metadata_rdv_lock); + } + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + ret = lttng_kconsumer_read_subbuffer(stream, ctx); + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + ret = lttng_ustconsumer_read_subbuffer(stream, ctx); + break; + default: + ERR("Unknown consumer_data type"); + assert(0); + ret = -ENOSYS; + break; + } + + if (stream->metadata_flag) { + pthread_cond_broadcast(&stream->metadata_rdv); + pthread_mutex_unlock(&stream->metadata_rdv_lock); + } + pthread_mutex_unlock(&stream->lock); + return ret; +} + +int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) +{ + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + return lttng_kconsumer_on_recv_stream(stream); + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + return lttng_ustconsumer_on_recv_stream(stream); + default: + ERR("Unknown consumer_data type"); + assert(0); + return -ENOSYS; + } +} + +/* + * Allocate and set consumer data hash tables. + */ +int lttng_consumer_init(void) +{ + consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!consumer_data.channel_ht) { + goto error; + } + + consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!consumer_data.relayd_ht) { + goto error; + } + + consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!consumer_data.stream_list_ht) { + goto error; + } + + consumer_data.stream_per_chan_id_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!consumer_data.stream_per_chan_id_ht) { + goto error; + } + + data_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!data_ht) { + goto error; + } + + metadata_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); + if (!metadata_ht) { + goto error; + } + + return 0; + +error: + return -1; +} + +/* + * Process the ADD_RELAYD command receive by a consumer. + * + * This will create a relayd socket pair and add it to the relayd hash table. + * The caller MUST acquire a RCU read side lock before calling it. + */ +int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, + struct lttng_consumer_local_data *ctx, int sock, + struct pollfd *consumer_sockpoll, + struct lttcomm_relayd_sock *relayd_sock, uint64_t sessiond_id, + uint64_t relayd_session_id) +{ + int fd = -1, ret = -1, relayd_created = 0; + enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; + struct consumer_relayd_sock_pair *relayd = NULL; + + assert(ctx); + assert(relayd_sock); + + DBG("Consumer adding relayd socket (idx: %" PRIu64 ")", net_seq_idx); + + /* Get relayd reference if exists. */ + relayd = consumer_find_relayd(net_seq_idx); + if (relayd == NULL) { + assert(sock_type == LTTNG_STREAM_CONTROL); + /* Not found. Allocate one. */ + relayd = consumer_allocate_relayd_sock_pair(net_seq_idx); + if (relayd == NULL) { + ret = -ENOMEM; + ret_code = LTTCOMM_CONSUMERD_ENOMEM; + goto error; + } else { + relayd->sessiond_session_id = sessiond_id; + relayd_created = 1; + } + + /* + * This code path MUST continue to the consumer send status message to + * we can notify the session daemon and continue our work without + * killing everything. + */ + } else { + /* + * relayd key should never be found for control socket. + */ + assert(sock_type != LTTNG_STREAM_CONTROL); + } + + /* First send a status message before receiving the fds. */ + ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); + if (ret < 0) { + /* Somehow, the session daemon is not responding anymore. */ + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); + goto error_nosignal; + } + + /* Poll on consumer socket. */ + ret = lttng_consumer_poll_socket(consumer_sockpoll); + if (ret) { + /* Needing to exit in the middle of a command: error. */ + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR); + ret = -EINTR; + goto error_nosignal; + } + + /* Get relayd socket from session daemon */ + ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); + if (ret != sizeof(fd)) { + ret = -1; + fd = -1; /* Just in case it gets set with an invalid value. */ + + /* + * Failing to receive FDs might indicate a major problem such as + * reaching a fd limit during the receive where the kernel returns a + * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we + * don't take any chances and stop everything. + * + * XXX: Feature request #558 will fix that and avoid this possible + * issue when reaching the fd limit. + */ + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_FD); + ret_code = LTTCOMM_CONSUMERD_ERROR_RECV_FD; + goto error; + } + + /* Copy socket information and received FD */ + switch (sock_type) { + case LTTNG_STREAM_CONTROL: + /* Copy received lttcomm socket */ + lttcomm_copy_sock(&relayd->control_sock.sock, &relayd_sock->sock); + ret = lttcomm_create_sock(&relayd->control_sock.sock); + /* Handle create_sock error. */ + if (ret < 0) { + ret_code = LTTCOMM_CONSUMERD_ENOMEM; + goto error; + } + /* + * Close the socket created internally by + * lttcomm_create_sock, so we can replace it by the one + * received from sessiond. + */ + if (close(relayd->control_sock.sock.fd)) { + PERROR("close"); + } + + /* Assign new file descriptor */ + relayd->control_sock.sock.fd = fd; + fd = -1; /* For error path */ + /* Assign version values. */ + relayd->control_sock.major = relayd_sock->major; + relayd->control_sock.minor = relayd_sock->minor; + + relayd->relayd_session_id = relayd_session_id; + + break; + case LTTNG_STREAM_DATA: + /* Copy received lttcomm socket */ + lttcomm_copy_sock(&relayd->data_sock.sock, &relayd_sock->sock); + ret = lttcomm_create_sock(&relayd->data_sock.sock); + /* Handle create_sock error. */ + if (ret < 0) { + ret_code = LTTCOMM_CONSUMERD_ENOMEM; + goto error; + } + /* + * Close the socket created internally by + * lttcomm_create_sock, so we can replace it by the one + * received from sessiond. + */ + if (close(relayd->data_sock.sock.fd)) { + PERROR("close"); + } + + /* Assign new file descriptor */ + relayd->data_sock.sock.fd = fd; + fd = -1; /* for eventual error paths */ + /* Assign version values. */ + relayd->data_sock.major = relayd_sock->major; + relayd->data_sock.minor = relayd_sock->minor; + break; + default: + ERR("Unknown relayd socket type (%d)", sock_type); + ret = -1; + ret_code = LTTCOMM_CONSUMERD_FATAL; + goto error; + } + + DBG("Consumer %s socket created successfully with net idx %" PRIu64 " (fd: %d)", + sock_type == LTTNG_STREAM_CONTROL ? "control" : "data", + relayd->net_seq_idx, fd); + + /* We successfully added the socket. Send status back. */ + ret = consumer_send_status_msg(sock, ret_code); + if (ret < 0) { + /* Somehow, the session daemon is not responding anymore. */ + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); + goto error_nosignal; + } + + /* + * Add relayd socket pair to consumer data hashtable. If object already + * exists or on error, the function gracefully returns. + */ + add_relayd(relayd); + + /* All good! */ + return 0; + +error: + if (consumer_send_status_msg(sock, ret_code) < 0) { + lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_FATAL); + } + +error_nosignal: + /* Close received socket if valid. */ + if (fd >= 0) { + if (close(fd)) { + PERROR("close received socket"); + } + } + + if (relayd_created) { + free(relayd); + } + + return ret; +} + +/* + * Try to lock the stream mutex. + * + * On success, 1 is returned else 0 indicating that the mutex is NOT lock. + */ +static int stream_try_lock(struct lttng_consumer_stream *stream) +{ + int ret; + + assert(stream); + + /* + * Try to lock the stream mutex. On failure, we know that the stream is + * being used else where hence there is data still being extracted. + */ + ret = pthread_mutex_trylock(&stream->lock); + if (ret) { + /* For both EBUSY and EINVAL error, the mutex is NOT locked. */ + ret = 0; + goto end; + } + + ret = 1; + +end: + return ret; +} + +/* + * Search for a relayd associated to the session id and return the reference. + * + * A rcu read side lock MUST be acquire before calling this function and locked + * until the relayd object is no longer necessary. + */ +static struct consumer_relayd_sock_pair *find_relayd_by_session_id(uint64_t id) +{ + struct lttng_ht_iter iter; + struct consumer_relayd_sock_pair *relayd = NULL; + + /* Iterate over all relayd since they are indexed by net_seq_idx. */ + cds_lfht_for_each_entry(consumer_data.relayd_ht->ht, &iter.iter, relayd, + node.node) { + /* + * Check by sessiond id which is unique here where the relayd session + * id might not be when having multiple relayd. + */ + if (relayd->sessiond_session_id == id) { + /* Found the relayd. There can be only one per id. */ + goto found; + } + } + + return NULL; + +found: + return relayd; +} + +/* + * Check if for a given session id there is still data needed to be extract + * from the buffers. + * + * Return 1 if data is pending or else 0 meaning ready to be read. + */ +int consumer_data_pending(uint64_t id) +{ + int ret; + struct lttng_ht_iter iter; + struct lttng_ht *ht; + struct lttng_consumer_stream *stream; + struct consumer_relayd_sock_pair *relayd = NULL; + int (*data_pending)(struct lttng_consumer_stream *); + + DBG("Consumer data pending command on session id %" PRIu64, id); + + rcu_read_lock(); + pthread_mutex_lock(&consumer_data.lock); + + switch (consumer_data.type) { + case LTTNG_CONSUMER_KERNEL: + data_pending = lttng_kconsumer_data_pending; + break; + case LTTNG_CONSUMER32_UST: + case LTTNG_CONSUMER64_UST: + data_pending = lttng_ustconsumer_data_pending; + break; + default: + ERR("Unknown consumer data type"); + assert(0); + } + + /* Ease our life a bit */ + ht = consumer_data.stream_list_ht; + + relayd = find_relayd_by_session_id(id); + if (relayd) { + /* Send init command for data pending. */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_begin_data_pending(&relayd->control_sock, + relayd->relayd_session_id); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret < 0) { + /* Communication error thus the relayd so no data pending. */ + goto data_not_pending; + } + } + + cds_lfht_for_each_entry_duplicate(ht->ht, + ht->hash_fct(&id, lttng_ht_seed), + ht->match_fct, &id, + &iter.iter, stream, node_session_id.node) { + /* If this call fails, the stream is being used hence data pending. */ + ret = stream_try_lock(stream); + if (!ret) { + goto data_pending; + } + + /* + * A removed node from the hash table indicates that the stream has + * been deleted thus having a guarantee that the buffers are closed + * on the consumer side. However, data can still be transmitted + * over the network so don't skip the relayd check. + */ + ret = cds_lfht_is_node_deleted(&stream->node.node); + if (!ret) { + /* Check the stream if there is data in the buffers. */ + ret = data_pending(stream); + if (ret == 1) { + pthread_mutex_unlock(&stream->lock); + goto data_pending; + } + } + + /* Relayd check */ + if (relayd) { + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + if (stream->metadata_flag) { + ret = relayd_quiescent_control(&relayd->control_sock, + stream->relayd_stream_id); + } else { + ret = relayd_data_pending(&relayd->control_sock, + stream->relayd_stream_id, + stream->next_net_seq_num - 1); + } + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret == 1) { + pthread_mutex_unlock(&stream->lock); + goto data_pending; + } + } + pthread_mutex_unlock(&stream->lock); + } + + if (relayd) { + unsigned int is_data_inflight = 0; + + /* Send init command for data pending. */ + pthread_mutex_lock(&relayd->ctrl_sock_mutex); + ret = relayd_end_data_pending(&relayd->control_sock, + relayd->relayd_session_id, &is_data_inflight); + pthread_mutex_unlock(&relayd->ctrl_sock_mutex); + if (ret < 0) { + goto data_not_pending; + } + if (is_data_inflight) { + goto data_pending; + } + } + + /* + * Finding _no_ node in the hash table and no inflight data means that the + * stream(s) have been removed thus data is guaranteed to be available for + * analysis from the trace files. + */ + +data_not_pending: + /* Data is available to be read by a viewer. */ + pthread_mutex_unlock(&consumer_data.lock); + rcu_read_unlock(); + return 0; + +data_pending: + /* Data is still being extracted from buffers. */ + pthread_mutex_unlock(&consumer_data.lock); + rcu_read_unlock(); + return 1; +} + +/* + * Send a ret code status message to the sessiond daemon. + * + * Return the sendmsg() return value. + */ +int consumer_send_status_msg(int sock, int ret_code) +{ + struct lttcomm_consumer_status_msg msg; + + memset(&msg, 0, sizeof(msg)); + msg.ret_code = ret_code; + + return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); +} + +/* + * Send a channel status message to the sessiond daemon. + * + * Return the sendmsg() return value. + */ +int consumer_send_status_channel(int sock, + struct lttng_consumer_channel *channel) +{ + struct lttcomm_consumer_status_channel msg; + + assert(sock >= 0); + + memset(&msg, 0, sizeof(msg)); + if (!channel) { + msg.ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; + } else { + msg.ret_code = LTTCOMM_CONSUMERD_SUCCESS; + msg.key = channel->key; + msg.stream_count = channel->streams.count; + } + + return lttcomm_send_unix_sock(sock, &msg, sizeof(msg)); +} + +unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, + unsigned long produced_pos, uint64_t nb_packets_per_stream, + uint64_t max_sb_size) +{ + unsigned long start_pos; + + if (!nb_packets_per_stream) { + return consumed_pos; /* Grab everything */ + } + start_pos = produced_pos - offset_align_floor(produced_pos, max_sb_size); + start_pos -= max_sb_size * nb_packets_per_stream; + if ((long) (start_pos - consumed_pos) < 0) { + return consumed_pos; /* Grab everything */ + } + return start_pos; +} diff --git a/src/common/consumer/consumer.h b/src/common/consumer/consumer.h new file mode 100644 index 000000000..c7ef3fb38 --- /dev/null +++ b/src/common/consumer/consumer.h @@ -0,0 +1,698 @@ +/* + * Copyright (C) 2011 - Julien Desfossez + * Mathieu Desnoyers + * 2012 - David Goulet + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef LIB_CONSUMER_H +#define LIB_CONSUMER_H + +#include +#include +#include +#include + +#include + +#include +#include +#include +#include +#include +#include + +/* Commands for consumer */ +enum lttng_consumer_command { + LTTNG_CONSUMER_ADD_CHANNEL, + LTTNG_CONSUMER_ADD_STREAM, + /* pause, delete, active depending on fd state */ + LTTNG_CONSUMER_UPDATE_STREAM, + /* inform the consumer to quit when all fd has hang up */ + LTTNG_CONSUMER_STOP, /* deprecated */ + LTTNG_CONSUMER_ADD_RELAYD_SOCKET, + /* Inform the consumer to kill a specific relayd connection */ + LTTNG_CONSUMER_DESTROY_RELAYD, + /* Return to the sessiond if there is data pending for a session */ + LTTNG_CONSUMER_DATA_PENDING, + /* Consumer creates a channel and returns it to sessiond. */ + LTTNG_CONSUMER_ASK_CHANNEL_CREATION, + LTTNG_CONSUMER_GET_CHANNEL, + LTTNG_CONSUMER_DESTROY_CHANNEL, + LTTNG_CONSUMER_PUSH_METADATA, + LTTNG_CONSUMER_CLOSE_METADATA, + LTTNG_CONSUMER_SETUP_METADATA, + LTTNG_CONSUMER_FLUSH_CHANNEL, + LTTNG_CONSUMER_SNAPSHOT_CHANNEL, + LTTNG_CONSUMER_SNAPSHOT_METADATA, + LTTNG_CONSUMER_STREAMS_SENT, +}; + +/* State of each fd in consumer */ +enum lttng_consumer_stream_state { + LTTNG_CONSUMER_ACTIVE_STREAM, + LTTNG_CONSUMER_PAUSE_STREAM, + LTTNG_CONSUMER_DELETE_STREAM, +}; + +enum lttng_consumer_type { + LTTNG_CONSUMER_UNKNOWN = 0, + LTTNG_CONSUMER_KERNEL, + LTTNG_CONSUMER64_UST, + LTTNG_CONSUMER32_UST, +}; + +enum consumer_endpoint_status { + CONSUMER_ENDPOINT_ACTIVE, + CONSUMER_ENDPOINT_INACTIVE, +}; + +enum consumer_channel_output { + CONSUMER_CHANNEL_MMAP = 0, + CONSUMER_CHANNEL_SPLICE = 1, +}; + +enum consumer_channel_type { + CONSUMER_CHANNEL_TYPE_METADATA = 0, + CONSUMER_CHANNEL_TYPE_DATA = 1, +}; + +extern struct lttng_consumer_global_data consumer_data; + +struct stream_list { + struct cds_list_head head; + unsigned int count; +}; + +/* Stub. */ +struct consumer_metadata_cache; + +struct lttng_consumer_channel { + /* HT node used for consumer_data.channel_ht */ + struct lttng_ht_node_u64 node; + /* Indexed key. Incremented value in the consumer. */ + uint64_t key; + /* Number of streams referencing this channel */ + int refcount; + /* Tracing session id on the session daemon side. */ + uint64_t session_id; + /* + * Session id when requesting metadata to the session daemon for + * a session with per-PID buffers. + */ + uint64_t session_id_per_pid; + /* Channel trace file path name. */ + char pathname[PATH_MAX]; + /* Channel name. */ + char name[LTTNG_SYMBOL_NAME_LEN]; + /* UID and GID of the session owning this channel. */ + uid_t uid; + gid_t gid; + /* Relayd id of the channel. -1ULL if it does not apply. */ + uint64_t relayd_id; + /* + * Number of streams NOT initialized yet. This is used in order to not + * delete this channel if streams are getting initialized. + */ + unsigned int nb_init_stream_left; + /* Output type (mmap or splice). */ + enum consumer_channel_output output; + /* Channel type for stream */ + enum consumer_channel_type type; + + /* For UST */ + uid_t ust_app_uid; /* Application UID. */ + struct ustctl_consumer_channel *uchan; + unsigned char uuid[UUID_STR_LEN]; + /* + * Temporary stream list used to store the streams once created and waiting + * to be sent to the session daemon by receiving the + * LTTNG_CONSUMER_GET_CHANNEL. + */ + struct stream_list streams; + + /* + * Set if the channel is metadata. We keep a reference to the stream + * because we have to flush data once pushed by the session daemon. For a + * regular channel, this is always set to NULL. + */ + struct lttng_consumer_stream *metadata_stream; + + /* for UST */ + int wait_fd; + /* Node within channel thread ht */ + struct lttng_ht_node_u64 wait_fd_node; + + /* Metadata cache is metadata channel */ + struct consumer_metadata_cache *metadata_cache; + /* For UST metadata periodical flush */ + int switch_timer_enabled; + timer_t switch_timer; + int switch_timer_error; + + /* For the live mode */ + int live_timer_enabled; + timer_t live_timer; + int live_timer_error; + + /* On-disk circular buffer */ + uint64_t tracefile_size; + uint64_t tracefile_count; + /* + * Monitor or not the streams of this channel meaning this indicates if the + * streams should be sent to the data/metadata thread or added to the no + * monitor list of the channel. + */ + unsigned int monitor; + + /* + * Channel lock. + * + * This lock protects against concurrent update of channel. + * + * This is nested INSIDE the consumer data lock. + * This is nested OUTSIDE the channel timer lock. + * This is nested OUTSIDE the metadata cache lock. + * This is nested OUTSIDE stream lock. + * This is nested OUTSIDE consumer_relayd_sock_pair lock. + */ + pthread_mutex_t lock; + + /* + * Channel teardown lock. + * + * This lock protect against teardown of channel. It is _never_ + * taken by the timer handler. + * + * This is nested INSIDE the consumer data lock. + * This is nested INSIDE the channel lock. + * This is nested OUTSIDE the metadata cache lock. + * This is nested OUTSIDE stream lock. + * This is nested OUTSIDE consumer_relayd_sock_pair lock. + */ + pthread_mutex_t timer_lock; + + /* Timer value in usec for live streaming. */ + unsigned int live_timer_interval; + + int *stream_fds; + int nr_stream_fds; + char root_shm_path[PATH_MAX]; + char shm_path[PATH_MAX]; +}; + +/* + * Internal representation of the streams, sessiond_key is used to identify + * uniquely a stream. + */ +struct lttng_consumer_stream { + /* HT node used by the data_ht and metadata_ht */ + struct lttng_ht_node_u64 node; + /* stream indexed per channel key node */ + struct lttng_ht_node_u64 node_channel_id; + /* HT node used in consumer_data.stream_list_ht */ + struct lttng_ht_node_u64 node_session_id; + /* Pointer to associated channel. */ + struct lttng_consumer_channel *chan; + + /* Key by which the stream is indexed for 'node'. */ + uint64_t key; + /* + * File descriptor of the data output file. This can be either a file or a + * socket fd for relayd streaming. + */ + int out_fd; /* output file to write the data */ + /* Write position in the output file descriptor */ + off_t out_fd_offset; + /* Amount of bytes written to the output */ + uint64_t output_written; + enum lttng_consumer_stream_state state; + int shm_fd_is_copy; + int data_read; + int hangup_flush_done; + + /* + * metadata_timer_lock protects flags waiting_on_metadata and + * missed_metadata_flush. + */ + pthread_mutex_t metadata_timer_lock; + /* + * Flag set when awaiting metadata to be pushed. Used in the + * timer thread to skip waiting on the stream (and stream lock) to + * ensure we can proceed to flushing metadata in live mode. + */ + bool waiting_on_metadata; + /* Raised when a timer misses a metadata flush. */ + bool missed_metadata_flush; + + enum lttng_event_output output; + /* Maximum subbuffer size. */ + unsigned long max_sb_size; + + /* + * Still used by the kernel for MMAP output. For UST, the ustctl getter is + * used for the mmap base and offset. + */ + void *mmap_base; + unsigned long mmap_len; + + /* For UST */ + + int wait_fd; + /* UID/GID of the user owning the session to which stream belongs */ + uid_t uid; + gid_t gid; + /* Network sequence number. Indicating on which relayd socket it goes. */ + uint64_t net_seq_idx; + /* + * Indicate if this stream was successfully sent to a relayd. This is set + * after the refcount of the relayd is incremented and is checked when the + * stream is closed before decrementing the refcount in order to avoid an + * unbalanced state. + */ + unsigned int sent_to_relayd; + + /* Identify if the stream is the metadata */ + unsigned int metadata_flag; + /* Used when the stream is set for network streaming */ + uint64_t relayd_stream_id; + /* + * When sending a stream packet to a relayd, this number is used to track + * the packet sent by the consumer and seen by the relayd. When sending the + * data header to the relayd, this number is sent and if the transmission + * was successful, it is incremented. + * + * Even if the full data is not fully transmitted it won't matter since + * only two possible error can happen after that where either the relayd + * died or a read error is detected on the stream making this value useless + * after that. + * + * This value SHOULD be read/updated atomically or with the lock acquired. + */ + uint64_t next_net_seq_num; + /* + * Lock to use the stream FDs since they are used between threads. + * + * This is nested INSIDE the consumer_data lock. + * This is nested INSIDE the metadata cache lock. + * This is nested INSIDE the channel lock. + * This is nested INSIDE the channel timer lock. + * This is nested OUTSIDE consumer_relayd_sock_pair lock. + */ + pthread_mutex_t lock; + /* Tracing session id */ + uint64_t session_id; + /* + * Indicates if the stream end point is still active or not (network + * streaming or local file system). The thread "owning" the stream is + * handling this status and can be notified of a state change through the + * consumer data appropriate pipe. + */ + enum consumer_endpoint_status endpoint_status; + /* Stream name. Format is: _ */ + char name[LTTNG_SYMBOL_NAME_LEN]; + /* Internal state of libustctl. */ + struct ustctl_consumer_stream *ustream; + struct cds_list_head send_node; + /* On-disk circular buffer */ + uint64_t tracefile_size_current; + uint64_t tracefile_count_current; + /* + * Monitor or not the streams of this channel meaning this indicates if the + * streams should be sent to the data/metadata thread or added to the no + * monitor list of the channel. + */ + unsigned int monitor; + /* + * Indicate if the stream is globally visible meaning that it has been + * added to the multiple hash tables. If *not* set, NO lock should be + * acquired in the destroy path. + */ + unsigned int globally_visible; + /* + * Pipe to wake up the metadata poll thread when the UST metadata + * cache is updated. + */ + int ust_metadata_poll_pipe[2]; + /* + * How much metadata was read from the metadata cache and sent + * to the channel. + */ + uint64_t ust_metadata_pushed; + /* + * FD of the index file for this stream. + */ + int index_fd; + + /* + * Local pipe to extract data when using splice. + */ + int splice_pipe[2]; + + /* + * Rendez-vous point between data and metadata stream in live mode. + */ + pthread_cond_t metadata_rdv; + pthread_mutex_t metadata_rdv_lock; + + /* Indicate if the stream still has some data to be read. */ + unsigned int has_data:1; +}; + +/* + * Internal representation of a relayd socket pair. + */ +struct consumer_relayd_sock_pair { + /* Network sequence number. */ + uint64_t net_seq_idx; + /* Number of stream associated with this relayd */ + unsigned int refcount; + + /* + * This flag indicates whether or not we should destroy this object. The + * destruction should ONLY occurs when this flag is set and the refcount is + * set to zero. + */ + unsigned int destroy_flag; + + /* + * Mutex protecting the control socket to avoid out of order packets + * between threads sending data to the relayd. Since metadata data is sent + * over that socket, at least two sendmsg() are needed (header + data) + * creating a race for packets to overlap between threads using it. + * + * This is nested INSIDE the consumer_data lock. + * This is nested INSIDE the stream lock. + */ + pthread_mutex_t ctrl_sock_mutex; + + /* Control socket. Command and metadata are passed over it */ + struct lttcomm_relayd_sock control_sock; + + /* + * We don't need a mutex at this point since we only splice or write single + * large chunk of data with a header appended at the begining. Moreover, + * this socket is for now only used in a single thread. + */ + struct lttcomm_relayd_sock data_sock; + struct lttng_ht_node_u64 node; + + /* Session id on both sides for the sockets. */ + uint64_t relayd_session_id; + uint64_t sessiond_session_id; +}; + +/* + * UST consumer local data to the program. One or more instance per + * process. + */ +struct lttng_consumer_local_data { + /* + * Function to call when data is available on a buffer. + * Returns the number of bytes read, or negative error value. + */ + ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, + struct lttng_consumer_local_data *ctx); + /* + * function to call when we receive a new channel, it receives a + * newly allocated channel, depending on the return code of this + * function, the new channel will be handled by the application + * or the library. + * + * Returns: + * > 0 (success, FD is kept by application) + * == 0 (success, FD is left to library) + * < 0 (error) + */ + int (*on_recv_channel)(struct lttng_consumer_channel *channel); + /* + * function to call when we receive a new stream, it receives a + * newly allocated stream, depending on the return code of this + * function, the new stream will be handled by the application + * or the library. + * + * Returns: + * > 0 (success, FD is kept by application) + * == 0 (success, FD is left to library) + * < 0 (error) + */ + int (*on_recv_stream)(struct lttng_consumer_stream *stream); + /* + * function to call when a stream is getting updated by the session + * daemon, this function receives the sessiond key and the new + * state, depending on the return code of this function the + * update of state for the stream is handled by the application + * or the library. + * + * Returns: + * > 0 (success, FD is kept by application) + * == 0 (success, FD is left to library) + * < 0 (error) + */ + int (*on_update_stream)(uint64_t sessiond_key, uint32_t state); + enum lttng_consumer_type type; + /* socket to communicate errors with sessiond */ + int consumer_error_socket; + /* socket to ask metadata to sessiond. */ + int consumer_metadata_socket; + /* + * Protect consumer_metadata_socket. + * + * This is nested OUTSIDE the metadata cache lock. + */ + pthread_mutex_t metadata_socket_lock; + /* socket to exchange commands with sessiond */ + char *consumer_command_sock_path; + /* communication with splice */ + int consumer_channel_pipe[2]; + /* Data stream poll thread pipe. To transfer data stream to the thread */ + struct lttng_pipe *consumer_data_pipe; + + /* + * Data thread use that pipe to catch wakeup from read subbuffer that + * detects that there is still data to be read for the stream encountered. + * Before doing so, the stream is flagged to indicate that there is still + * data to be read. + * + * Both pipes (read/write) are owned and used inside the data thread. + */ + struct lttng_pipe *consumer_wakeup_pipe; + /* Indicate if the wakeup thread has been notified. */ + unsigned int has_wakeup:1; + + /* to let the signal handler wake up the fd receiver thread */ + int consumer_should_quit[2]; + /* Metadata poll thread pipe. Transfer metadata stream to it */ + struct lttng_pipe *consumer_metadata_pipe; +}; + +/* + * Library-level data. One instance per process. + */ +struct lttng_consumer_global_data { + /* + * At this time, this lock is used to ensure coherence between the count + * and number of element in the hash table. It's also a protection for + * concurrent read/write between threads. + * + * This is nested OUTSIDE the stream lock. + * This is nested OUTSIDE the consumer_relayd_sock_pair lock. + */ + pthread_mutex_t lock; + + /* + * Number of streams in the data stream hash table declared outside. + * Protected by consumer_data.lock. + */ + int stream_count; + + /* Channel hash table protected by consumer_data.lock. */ + struct lttng_ht *channel_ht; + /* + * Flag specifying if the local array of FDs needs update in the + * poll function. Protected by consumer_data.lock. + */ + unsigned int need_update; + enum lttng_consumer_type type; + + /* + * Relayd socket(s) hashtable indexed by network sequence number. Each + * stream has an index which associate the right relayd socket to use. + */ + struct lttng_ht *relayd_ht; + + /* + * This hash table contains all streams (metadata and data) indexed by + * session id. In other words, the ht is indexed by session id and each + * bucket contains the list of associated streams. + * + * This HT uses the "node_session_id" of the consumer stream. + */ + struct lttng_ht *stream_list_ht; + + /* + * This HT uses the "node_channel_id" of the consumer stream. + */ + struct lttng_ht *stream_per_chan_id_ht; +}; + +/* + * Init consumer data structures. + */ +int lttng_consumer_init(void); + +/* + * Set the error socket for communication with a session daemon. + */ +void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, + int sock); + +/* + * Set the command socket path for communication with a session daemon. + */ +void lttng_consumer_set_command_sock_path( + struct lttng_consumer_local_data *ctx, char *sock); + +/* + * Send return code to session daemon. + * + * Returns the return code of sendmsg : the number of bytes transmitted or -1 + * on error. + */ +int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd); + +/* + * Called from signal handler to ensure a clean exit. + */ +void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx); + +/* + * Cleanup the daemon's socket on exit. + */ +void lttng_consumer_cleanup(void); + +/* + * Flush pending writes to trace output disk file. + */ +void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream, + off_t orig_offset); + +/* + * Poll on the should_quit pipe and the command socket return -1 on error and + * should exit, 0 if data is available on the command socket + */ +int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); + +struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, + uint64_t stream_key, + enum lttng_consumer_stream_state state, + const char *channel_name, + uid_t uid, + gid_t gid, + uint64_t relayd_id, + uint64_t session_id, + int cpu, + int *alloc_ret, + enum consumer_channel_type type, + unsigned int monitor); +struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, + uint64_t session_id, + const char *pathname, + const char *name, + uid_t uid, + gid_t gid, + uint64_t relayd_id, + enum lttng_event_output output, + uint64_t tracefile_size, + uint64_t tracefile_count, + uint64_t session_id_per_pid, + unsigned int monitor, + unsigned int live_timer_interval, + const char *root_shm_path, + const char *shm_path); +void consumer_del_stream(struct lttng_consumer_stream *stream, + struct lttng_ht *ht); +void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, + struct lttng_ht *ht); +int consumer_add_channel(struct lttng_consumer_channel *channel, + struct lttng_consumer_local_data *ctx); +void consumer_del_channel(struct lttng_consumer_channel *channel); + +/* lttng-relayd consumer command */ +struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key); +int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path); +int consumer_send_relayd_streams_sent(uint64_t net_seq_idx); +void close_relayd_stream(struct lttng_consumer_stream *stream); +struct lttng_consumer_channel *consumer_find_channel(uint64_t key); +int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, + size_t data_size); +void consumer_steal_stream_key(int key, struct lttng_ht *ht); + +struct lttng_consumer_local_data *lttng_consumer_create( + enum lttng_consumer_type type, + ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, + struct lttng_consumer_local_data *ctx), + int (*recv_channel)(struct lttng_consumer_channel *channel), + int (*recv_stream)(struct lttng_consumer_stream *stream), + int (*update_stream)(uint64_t sessiond_key, uint32_t state)); +void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); +ssize_t lttng_consumer_on_read_subbuffer_mmap( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, unsigned long len, + unsigned long padding, + struct ctf_packet_index *index); +ssize_t lttng_consumer_on_read_subbuffer_splice( + struct lttng_consumer_local_data *ctx, + struct lttng_consumer_stream *stream, unsigned long len, + unsigned long padding, + struct ctf_packet_index *index); +int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream); +int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, + unsigned long *pos); +int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream); +int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream); +void *consumer_thread_metadata_poll(void *data); +void *consumer_thread_data_poll(void *data); +void *consumer_thread_sessiond_poll(void *data); +void *consumer_thread_channel_poll(void *data); +int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, + int sock, struct pollfd *consumer_sockpoll); + +ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, + struct lttng_consumer_local_data *ctx); +int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); +int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, + struct lttng_consumer_local_data *ctx, int sock, + struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock, + uint64_t sessiond_id, uint64_t relayd_session_id); +void consumer_flag_relayd_for_destroy( + struct consumer_relayd_sock_pair *relayd); +int consumer_data_pending(uint64_t id); +int consumer_send_status_msg(int sock, int ret_code); +int consumer_send_status_channel(int sock, + struct lttng_consumer_channel *channel); +void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, + uint64_t key); +void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd); +unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, + unsigned long produced_pos, uint64_t nb_packets_per_stream, + uint64_t max_sb_size); +int consumer_add_data_stream(struct lttng_consumer_stream *stream); +void consumer_del_stream_for_data(struct lttng_consumer_stream *stream); +int consumer_add_metadata_stream(struct lttng_consumer_stream *stream); +void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream); +int consumer_create_index_file(struct lttng_consumer_stream *stream); + +#endif /* LIB_CONSUMER_H */ diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c index 7875e890b..fac1f0b8a 100644 --- a/src/common/kernel-consumer/kernel-consumer.c +++ b/src/common/kernel-consumer/kernel-consumer.c @@ -39,9 +39,9 @@ #include #include #include -#include +#include #include -#include +#include #include "kernel-consumer.h" diff --git a/src/common/kernel-consumer/kernel-consumer.h b/src/common/kernel-consumer/kernel-consumer.h index 1aad2733b..a07f52188 100644 --- a/src/common/kernel-consumer/kernel-consumer.h +++ b/src/common/kernel-consumer/kernel-consumer.h @@ -19,7 +19,7 @@ #ifndef _LTTNG_KCONSUMER_H #define _LTTNG_KCONSUMER_H -#include +#include int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream); int lttng_kconsumer_get_produced_snapshot(struct lttng_consumer_stream *stream, diff --git a/src/common/ust-consumer/ust-consumer.c b/src/common/ust-consumer/ust-consumer.c index 5bf3e7b5a..44bcfdc37 100644 --- a/src/common/ust-consumer/ust-consumer.c +++ b/src/common/ust-consumer/ust-consumer.c @@ -38,9 +38,9 @@ #include #include #include -#include -#include -#include +#include +#include +#include #include #include diff --git a/src/common/ust-consumer/ust-consumer.h b/src/common/ust-consumer/ust-consumer.h index 339c52747..01a50773c 100644 --- a/src/common/ust-consumer/ust-consumer.h +++ b/src/common/ust-consumer/ust-consumer.h @@ -21,7 +21,7 @@ #include -#include +#include #ifdef HAVE_LIBLTTNG_UST_CTL