+++ /dev/null
-/*
- * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
- * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#include "common/index/ctf-index.h"
-#define _LGPL_SOURCE
-#include <poll.h>
-#include <pthread.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <inttypes.h>
-#include <signal.h>
-
-#include <bin/lttng-consumerd/health-consumerd.h>
-#include <common/common.h>
-#include <common/utils.h>
-#include <common/time.h>
-#include <common/compat/poll.h>
-#include <common/compat/endian.h>
-#include <common/index/index.h>
-#include <common/kernel-ctl/kernel-ctl.h>
-#include <common/sessiond-comm/relayd.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/kernel-consumer/kernel-consumer.h>
-#include <common/relayd/relayd.h>
-#include <common/ust-consumer/ust-consumer.h>
-#include <common/consumer/consumer-timer.h>
-#include <common/consumer/consumer.h>
-#include <common/consumer/consumer-stream.h>
-#include <common/consumer/consumer-testpoint.h>
-#include <common/align.h>
-#include <common/consumer/consumer-metadata-cache.h>
-#include <common/trace-chunk.h>
-#include <common/trace-chunk-registry.h>
-#include <common/string-utils/format.h>
-#include <common/dynamic-array.h>
-
-struct lttng_consumer_global_data the_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 used to temporarily pause data consumption from testpoints. */
-int data_consumption_paused;
-
-/*
- * 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.
- */
-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;
-
-static const char *get_consumer_domain(void)
-{
- switch (the_consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- return DEFAULT_KERNEL_TRACE_DIR;
- case LTTNG_CONSUMER64_UST:
- /* Fall-through. */
- case LTTNG_CONSUMER32_UST:
- return DEFAULT_UST_TRACE_DIR;
- default:
- abort();
- }
-}
-
-/*
- * 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;
-
- LTTNG_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;
-
- LTTNG_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;
-
- LTTNG_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(the_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 (the_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);
-
- pthread_mutex_destroy(&relayd->ctrl_sock_mutex);
- 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(the_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)
-{
- struct lttng_ht_iter iter;
-
- DBG("Consumer delete channel key %" PRIu64, channel->key);
-
- pthread_mutex_lock(&the_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);
- }
- if (channel->monitor_timer_enabled == 1) {
- consumer_timer_monitor_stop(channel);
- }
-
- switch (the_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");
- abort();
- goto end;
- }
-
- lttng_trace_chunk_put(channel->trace_chunk);
- channel->trace_chunk = NULL;
-
- if (channel->is_published) {
- int ret;
-
- rcu_read_lock();
- iter.iter.node = &channel->node.node;
- ret = lttng_ht_del(the_consumer_data.channel_ht, &iter);
- LTTNG_ASSERT(!ret);
-
- iter.iter.node = &channel->channels_by_session_id_ht_node.node;
- ret = lttng_ht_del(the_consumer_data.channels_by_session_id_ht,
- &iter);
- LTTNG_ASSERT(!ret);
- rcu_read_unlock();
- }
-
- channel->is_deleted = true;
- call_rcu(&channel->node.head, free_channel_rcu);
-end:
- pthread_mutex_unlock(&channel->lock);
- pthread_mutex_unlock(&the_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(the_consumer_data.relayd_ht->ht, &iter.iter,
- relayd, node.node) {
- consumer_destroy_relayd(relayd);
- }
-
- rcu_read_unlock();
-
- lttng_ht_destroy(the_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.
- */
-void lttng_consumer_cleanup_relayd(struct consumer_relayd_sock_pair *relayd)
-{
- uint64_t netidx;
-
- LTTNG_ASSERT(relayd);
-
- DBG("Cleaning up relayd object ID %"PRIu64, relayd->net_seq_idx);
-
- /* 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.
- */
- notify_thread_lttng_pipe(relayd->ctx->consumer_data_pipe);
- notify_thread_lttng_pipe(relayd->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)
-{
- LTTNG_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);
-}
-
-void consumer_stream_update_channel_attributes(
- struct lttng_consumer_stream *stream,
- struct lttng_consumer_channel *channel)
-{
- stream->channel_read_only_attributes.tracefile_size =
- channel->tracefile_size;
-}
-
-/*
- * Add a stream to the global list protected by a mutex.
- */
-void consumer_add_data_stream(struct lttng_consumer_stream *stream)
-{
- struct lttng_ht *ht = data_ht;
-
- LTTNG_ASSERT(stream);
- LTTNG_ASSERT(ht);
-
- DBG3("Adding consumer stream %" PRIu64, stream->key);
-
- pthread_mutex_lock(&the_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(the_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(the_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. */
- the_consumer_data.stream_count++;
- the_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(&the_consumer_data.lock);
-}
-
-/*
- * 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;
-
- LTTNG_ASSERT(relayd);
-
- lttng_ht_lookup(the_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(the_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(the_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;
-
- LTTNG_ASSERT(stream);
- LTTNG_ASSERT(stream->net_seq_idx != -1ULL);
- LTTNG_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,
- get_consumer_domain(), path, &stream->relayd_stream_id,
- stream->chan->tracefile_size,
- stream->chan->tracefile_count,
- stream->trace_chunk);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- ERR("Relayd add stream failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- 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;
-
- LTTNG_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) {
- ERR("Relayd streams sent failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- 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 */
- LTTNG_ASSERT(stream);
- LTTNG_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;
-}
-
-/*
- * Write a character on the metadata poll pipe to wake the metadata thread.
- * Returns 0 on success, -1 on error.
- */
-int consumer_metadata_wakeup_pipe(const struct lttng_consumer_channel *channel)
-{
- int ret = 0;
-
- DBG("Waking up metadata poll thread (writing to pipe): channel name = '%s'",
- channel->name);
- if (channel->monitor && channel->metadata_stream) {
- const char dummy = 'c';
- const ssize_t write_ret = lttng_write(
- channel->metadata_stream->ust_metadata_poll_pipe[1],
- &dummy, 1);
-
- if (write_ret < 1) {
- if (errno == EWOULDBLOCK) {
- /*
- * This is fine, the metadata poll thread
- * is having a hard time keeping-up, but
- * it will eventually wake-up and consume
- * the available data.
- */
- ret = 0;
- } else {
- PERROR("Failed to write to UST metadata pipe while attempting to wake-up the metadata poll thread");
- ret = -1;
- goto end;
- }
- }
- }
-
-end:
- return ret;
-}
-
-/*
- * Trigger a dump of the metadata content. Following/during the succesful
- * completion of this call, the metadata poll thread will start receiving
- * metadata packets to consume.
- *
- * The caller must hold the channel and stream locks.
- */
-static
-int consumer_metadata_stream_dump(struct lttng_consumer_stream *stream)
-{
- int ret;
-
- ASSERT_LOCKED(stream->chan->lock);
- ASSERT_LOCKED(stream->lock);
- LTTNG_ASSERT(stream->metadata_flag);
- LTTNG_ASSERT(stream->chan->trace_chunk);
-
- switch (the_consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- /*
- * Reset the position of what has been read from the
- * metadata cache to 0 so we can dump it again.
- */
- ret = kernctl_metadata_cache_dump(stream->wait_fd);
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- /*
- * Reset the position pushed from the metadata cache so it
- * will write from the beginning on the next push.
- */
- stream->ust_metadata_pushed = 0;
- ret = consumer_metadata_wakeup_pipe(stream->chan);
- break;
- default:
- ERR("Unknown consumer_data type");
- abort();
- }
- if (ret < 0) {
- ERR("Failed to dump the metadata cache");
- }
- return ret;
-}
-
-static
-int lttng_consumer_channel_set_trace_chunk(
- struct lttng_consumer_channel *channel,
- struct lttng_trace_chunk *new_trace_chunk)
-{
- pthread_mutex_lock(&channel->lock);
- if (channel->is_deleted) {
- /*
- * The channel has been logically deleted and should no longer
- * be used. It has released its reference to its current trace
- * chunk and should not acquire a new one.
- *
- * Return success as there is nothing for the caller to do.
- */
- goto end;
- }
-
- /*
- * The acquisition of the reference cannot fail (barring
- * a severe internal error) since a reference to the published
- * chunk is already held by the caller.
- */
- if (new_trace_chunk) {
- const bool acquired_reference = lttng_trace_chunk_get(
- new_trace_chunk);
-
- LTTNG_ASSERT(acquired_reference);
- }
-
- lttng_trace_chunk_put(channel->trace_chunk);
- channel->trace_chunk = new_trace_chunk;
-end:
- pthread_mutex_unlock(&channel->lock);
- return 0;
-}
-
-/*
- * 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 uint64_t *chunk_id,
- const char *pathname,
- const char *name,
- 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,
- bool is_in_live_session,
- const char *root_shm_path,
- const char *shm_path)
-{
- struct lttng_consumer_channel *channel = NULL;
- struct lttng_trace_chunk *trace_chunk = NULL;
-
- if (chunk_id) {
- trace_chunk = lttng_trace_chunk_registry_find_chunk(
- the_consumer_data.chunk_registry, session_id,
- *chunk_id);
- if (!trace_chunk) {
- ERR("Failed to find trace chunk reference during creation of channel");
- goto end;
- }
- }
-
- 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->relayd_id = relayd_id;
- channel->tracefile_size = tracefile_size;
- channel->tracefile_count = tracefile_count;
- channel->monitor = monitor;
- channel->live_timer_interval = live_timer_interval;
- channel->is_live = is_in_live_session;
- 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:
- abort();
- 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);
- lttng_ht_node_init_u64(&channel->channels_by_session_id_ht_node,
- channel->session_id);
-
- channel->wait_fd = -1;
- CDS_INIT_LIST_HEAD(&channel->streams.head);
-
- if (trace_chunk) {
- int ret = lttng_consumer_channel_set_trace_chunk(channel,
- trace_chunk);
- if (ret) {
- goto error;
- }
- }
-
- DBG("Allocated channel (key %" PRIu64 ")", channel->key);
-
-end:
- lttng_trace_chunk_put(trace_chunk);
- return channel;
-error:
- consumer_del_channel(channel);
- channel = NULL;
- goto end;
-}
-
-/*
- * 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(&the_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(the_consumer_data.channel_ht, &channel->node);
- lttng_ht_add_u64(the_consumer_data.channels_by_session_id_ht,
- &channel->channels_by_session_id_ht_node);
- rcu_read_unlock();
- channel->is_published = true;
-
- pthread_mutex_unlock(&channel->timer_lock);
- pthread_mutex_unlock(&channel->lock);
- pthread_mutex_unlock(&the_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 *nb_inactive_fd)
-{
- int i = 0;
- struct lttng_ht_iter iter;
- struct lttng_consumer_stream *stream;
-
- LTTNG_ASSERT(ctx);
- LTTNG_ASSERT(ht);
- LTTNG_ASSERT(pollfd);
- LTTNG_ASSERT(local_stream);
-
- DBG("Updating poll fd array");
- *nb_inactive_fd = 0;
- 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.
- *
- * We track the number of inactive FDs because they still need to be
- * closed by the polling thread after a wakeup on the data_pipe or
- * metadata_pipe.
- */
- if (stream->endpoint_status == CONSUMER_ENDPOINT_INACTIVE) {
- (*nb_inactive_fd)++;
- continue;
- }
- /*
- * This clobbers way too much the debug output. Uncomment that if you
- * need it for debugging purposes.
- */
- (*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;
- unsigned int trace_chunks_left;
-
- rcu_read_lock();
-
- cds_lfht_for_each_entry(the_consumer_data.channel_ht->ht, &iter.iter,
- channel, node.node) {
- consumer_del_channel(channel);
- }
-
- rcu_read_unlock();
-
- lttng_ht_destroy(the_consumer_data.channel_ht);
- lttng_ht_destroy(the_consumer_data.channels_by_session_id_ht);
-
- cleanup_relayd_ht();
-
- lttng_ht_destroy(the_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(the_consumer_data.stream_list_ht);
-
- /*
- * Trace chunks in the registry may still exist if the session
- * daemon has encountered an internal error and could not
- * tear down its sessions and/or trace chunks properly.
- *
- * Release the session daemon's implicit reference to any remaining
- * trace chunk and print an error if any trace chunk was found. Note
- * that there are _no_ legitimate cases for trace chunks to be left,
- * it is a leak. However, it can happen following a crash of the
- * session daemon and not emptying the registry would cause an assertion
- * to hit.
- */
- trace_chunks_left = lttng_trace_chunk_registry_put_each_chunk(
- the_consumer_data.chunk_registry);
- if (trace_chunks_left) {
- ERR("%u trace chunks are leaked by lttng-consumerd. "
- "This can be caused by an internal error of the session daemon.",
- trace_chunks_left);
- }
- /* Run all callbacks freeing each chunk. */
- rcu_barrier();
- lttng_trace_chunk_registry_destroy(the_consumer_data.chunk_registry);
-}
-
-/*
- * Called from signal handler.
- */
-void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx)
-{
- ssize_t ret;
-
- CMM_STORE_SHARED(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");
-}
-
-
-/*
- * Flush pending writes to trace output disk file.
- */
-static
-void lttng_consumer_sync_trace_file(struct lttng_consumer_stream *stream,
- off_t orig_offset)
-{
- int ret;
- 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.
- */
- ret = posix_fadvise(outfd, orig_offset - stream->max_sb_size,
- stream->max_sb_size, POSIX_FADV_DONTNEED);
- if (ret && ret != -ENOSYS) {
- errno = ret;
- PERROR("posix_fadvise on fd %i", outfd);
- }
-}
-
-/*
- * 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, bool locked_by_caller),
- 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;
-
- LTTNG_ASSERT(the_consumer_data.type == LTTNG_CONSUMER_UNKNOWN ||
- the_consumer_data.type == type);
- the_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;
- }
-
- ctx->channel_monitor_pipe = -1;
-
- 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,
- 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 and the channel 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_stream *stream,
- const struct lttng_buffer_view *buffer,
- unsigned long padding)
-{
- 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;
- const size_t subbuf_content_size = buffer->size - padding;
- size_t write_len;
-
- /* RCU lock for the relayd pointer */
- rcu_read_lock();
- LTTNG_ASSERT(stream->net_seq_idx != (uint64_t) -1ULL ||
- stream->trace_chunk);
-
- /* 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;
- }
- }
-
- /* Handle stream on the relayd if the output is on the network */
- if (relayd) {
- unsigned long netlen = subbuf_content_size;
-
- /*
- * 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);
- if (stream->reset_metadata_flag) {
- ret = relayd_reset_metadata(&relayd->control_sock,
- stream->relayd_stream_id,
- stream->metadata_version);
- if (ret < 0) {
- relayd_hang_up = 1;
- goto write_error;
- }
- stream->reset_metadata_flag = 0;
- }
- 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, padding);
- if (ret < 0) {
- relayd_hang_up = 1;
- goto write_error;
- }
- }
-
- write_len = subbuf_content_size;
- } else {
- /* No streaming; we have to write the full padding. */
- if (stream->metadata_flag && stream->reset_metadata_flag) {
- ret = utils_truncate_stream_file(stream->out_fd, 0);
- if (ret < 0) {
- ERR("Reset metadata file");
- goto end;
- }
- stream->reset_metadata_flag = 0;
- }
-
- /*
- * Check if we need to change the tracefile before writing the packet.
- */
- if (stream->chan->tracefile_size > 0 &&
- (stream->tracefile_size_current + buffer->size) >
- stream->chan->tracefile_size) {
- ret = consumer_stream_rotate_output_files(stream);
- if (ret) {
- goto end;
- }
- outfd = stream->out_fd;
- orig_offset = 0;
- }
- stream->tracefile_size_current += buffer->size;
- write_len = buffer->size;
- }
-
- /*
- * 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, buffer->data, write_len);
- DBG("Consumer mmap write() ret %zd (len %zu)", ret, write_len);
- if (ret < 0 || ((size_t) ret != write_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) {
- /*
- * 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 != write_len %zu)", ret,
- write_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, write_len,
- SYNC_FILE_RANGE_WRITE);
- stream->out_fd_offset += write_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) {
- ERR("Relayd hangup. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- }
-
-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)
-{
- 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 (the_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");
- abort();
- }
-
- /* 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);
-
- if (stream->reset_metadata_flag) {
- ret = relayd_reset_metadata(&relayd->control_sock,
- stream->relayd_stream_id,
- stream->metadata_version);
- if (ret < 0) {
- relayd_hang_up = 1;
- goto write_error;
- }
- stream->reset_metadata_flag = 0;
- }
- ret = write_relayd_metadata_id(splice_pipe[1], stream,
- 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;
-
- if (stream->metadata_flag && stream->reset_metadata_flag) {
- ret = utils_truncate_stream_file(stream->out_fd, 0);
- if (ret < 0) {
- ERR("Reset metadata file");
- goto end;
- }
- stream->reset_metadata_flag = 0;
- }
- /*
- * 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 = consumer_stream_rotate_output_files(stream);
- if (ret < 0) {
- written = ret;
- goto end;
- }
- outfd = stream->out_fd;
- orig_offset = 0;
- }
- stream->tracefile_size_current += len;
- }
-
- 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;
- }
- if (!relayd) {
- 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) {
- ERR("Relayd hangup. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- /* 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;
-}
-
-/*
- * Sample the snapshot positions for a specific fd
- *
- * Returns 0 on success, < 0 on error
- */
-int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream)
-{
- switch (the_consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- return lttng_kconsumer_sample_snapshot_positions(stream);
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- return lttng_ustconsumer_sample_snapshot_positions(stream);
- default:
- ERR("Unknown consumer_data type");
- abort();
- return -ENOSYS;
- }
-}
-/*
- * 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 (the_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");
- abort();
- 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 (the_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");
- abort();
- return -ENOSYS;
- }
-}
-
-/*
- * Get the consumed position (free-running counter position in bytes).
- *
- * Returns 0 on success, < 0 on error
- */
-int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream,
- unsigned long *pos)
-{
- switch (the_consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- return lttng_kconsumer_get_consumed_snapshot(stream, pos);
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- return lttng_ustconsumer_get_consumed_snapshot(stream, pos);
- default:
- ERR("Unknown consumer_data type");
- abort();
- return -ENOSYS;
- }
-}
-
-int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
- int sock, struct pollfd *consumer_sockpoll)
-{
- switch (the_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");
- abort();
- return -ENOSYS;
- }
-}
-
-static
-void lttng_consumer_close_all_metadata(void)
-{
- switch (the_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");
- abort();
- }
-}
-
-/*
- * 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 *channel = NULL;
- bool free_channel = false;
-
- LTTNG_ASSERT(stream);
- /*
- * This call should NEVER receive regular stream. It must always be
- * metadata stream and this is crucial for data structure synchronization.
- */
- LTTNG_ASSERT(stream->metadata_flag);
-
- DBG3("Consumer delete metadata stream %d", stream->wait_fd);
-
- pthread_mutex_lock(&the_consumer_data.lock);
- /*
- * Note that this assumes that a stream's channel is never changed and
- * that the stream's lock doesn't need to be taken to sample its
- * channel.
- */
- channel = stream->chan;
- pthread_mutex_lock(&channel->lock);
- pthread_mutex_lock(&stream->lock);
- if (channel->metadata_cache) {
- /* Only applicable to userspace consumers. */
- pthread_mutex_lock(&channel->metadata_cache->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(&channel->refcount, 1)
- && !uatomic_read(&channel->nb_init_stream_left)) {
- /* Go for channel deletion! */
- free_channel = true;
- }
- stream->chan = NULL;
-
- /*
- * 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.
- */
- channel->metadata_stream = NULL;
-
- if (channel->metadata_cache) {
- pthread_mutex_unlock(&channel->metadata_cache->lock);
- }
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&channel->lock);
- pthread_mutex_unlock(&the_consumer_data.lock);
-
- if (free_channel) {
- consumer_del_channel(channel);
- }
-
- lttng_trace_chunk_put(stream->trace_chunk);
- stream->trace_chunk = NULL;
- consumer_stream_free(stream);
-}
-
-/*
- * Action done with the metadata stream when adding it to the consumer internal
- * data structures to handle it.
- */
-void consumer_add_metadata_stream(struct lttng_consumer_stream *stream)
-{
- struct lttng_ht *ht = metadata_ht;
- struct lttng_ht_iter iter;
- struct lttng_ht_node_u64 *node;
-
- LTTNG_ASSERT(stream);
- LTTNG_ASSERT(ht);
-
- DBG3("Adding metadata stream %" PRIu64 " to hash table", stream->key);
-
- pthread_mutex_lock(&the_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);
- LTTNG_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_u64(the_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(the_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(&the_consumer_data.lock);
-}
-
-/*
- * 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");
-
- LTTNG_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 caught in thread");
- if (ret < 0) {
- if (errno == EINTR) {
- ERR("Poll EINTR caught");
- 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 (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);
- LTTNG_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);
- LTTNG_ASSERT(stream->wait_fd == pollfd);
-
- do {
- health_code_update();
-
- len = ctx->on_buffer_ready(stream, ctx, false);
- /*
- * We don't check the return value here since if we get
- * a negative len, it means an error occurred 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 &&
- (the_consumer_data.type == LTTNG_CONSUMER32_UST ||
- the_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, false);
- /*
- * We don't check the return value here since if we get
- * a negative len, it means an error occurred 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;
- /* 2 for the consumer_data_pipe and wake up pipe */
- const int nb_pipes_fd = 2;
- /* Number of FDs with CONSUMER_ENDPOINT_INACTIVE but still open. */
- int nb_inactive_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(&the_consumer_data.lock);
- if (the_consumer_data.need_update) {
- free(pollfd);
- pollfd = NULL;
-
- free(local_stream);
- local_stream = NULL;
-
- /* Allocate for all fds */
- pollfd = zmalloc((the_consumer_data.stream_count +
- nb_pipes_fd) *
- sizeof(struct pollfd));
- if (pollfd == NULL) {
- PERROR("pollfd malloc");
- pthread_mutex_unlock(&the_consumer_data.lock);
- goto end;
- }
-
- local_stream = zmalloc((the_consumer_data.stream_count +
- nb_pipes_fd) *
- sizeof(struct lttng_consumer_stream *));
- if (local_stream == NULL) {
- PERROR("local_stream malloc");
- pthread_mutex_unlock(&the_consumer_data.lock);
- goto end;
- }
- ret = update_poll_array(ctx, &pollfd, local_stream,
- data_ht, &nb_inactive_fd);
- if (ret < 0) {
- ERR("Error in allocating pollfd or local_outfds");
- lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_POLL_ERROR);
- pthread_mutex_unlock(&the_consumer_data.lock);
- goto end;
- }
- nb_fd = ret;
- the_consumer_data.need_update = 0;
- }
- pthread_mutex_unlock(&the_consumer_data.lock);
-
- /* No FDs and consumer_quit, consumer_cleanup the thread */
- if (nb_fd == 0 && nb_inactive_fd == 0 &&
- CMM_LOAD_SHARED(consumer_quit) == 1) {
- err = 0; /* All is OK */
- goto end;
- }
- /* poll on the array of fds */
- restart:
- DBG("polling on %d fd", nb_fd + nb_pipes_fd);
- if (testpoint(consumerd_thread_data_poll)) {
- goto end;
- }
- health_poll_entry();
- num_rdy = poll(pollfd, nb_fd + nb_pipes_fd, -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 (caa_unlikely(data_consumption_paused)) {
- DBG("Data consumption paused, sleeping...");
- sleep(1);
- goto restart;
- }
-
- /*
- * 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, false);
- /* 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, false);
- /* 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))
- && (the_consumer_data.type == LTTNG_CONSUMER32_UST
- || the_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 = the_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 (the_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");
- abort();
- }
- 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);
- LTTNG_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 caught in thread");
- if (ret < 0) {
- if (errno == EINTR) {
- ERR("Poll EINTR caught");
- 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 (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);
- LTTNG_ASSERT(ret == 0);
-
- switch (the_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");
- abort();
- }
-
- /*
- * 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);
- LTTNG_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);
- LTTNG_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;
-
- LTTNG_ASSERT(ctx);
- LTTNG_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 (CMM_LOAD_SHARED(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
- */
- CMM_STORE_SHARED(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;
-}
-
-static int post_consume(struct lttng_consumer_stream *stream,
- const struct stream_subbuffer *subbuffer,
- struct lttng_consumer_local_data *ctx)
-{
- size_t i;
- int ret = 0;
- const size_t count = lttng_dynamic_array_get_count(
- &stream->read_subbuffer_ops.post_consume_cbs);
-
- for (i = 0; i < count; i++) {
- const post_consume_cb op = *(post_consume_cb *) lttng_dynamic_array_get_element(
- &stream->read_subbuffer_ops.post_consume_cbs,
- i);
-
- ret = op(stream, subbuffer, ctx);
- if (ret) {
- goto end;
- }
- }
-end:
- return ret;
-}
-
-ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
- struct lttng_consumer_local_data *ctx,
- bool locked_by_caller)
-{
- ssize_t ret, written_bytes = 0;
- int rotation_ret;
- struct stream_subbuffer subbuffer = {};
- enum get_next_subbuffer_status get_next_status;
-
- if (!locked_by_caller) {
- stream->read_subbuffer_ops.lock(stream);
- }
-
- if (stream->read_subbuffer_ops.on_wake_up) {
- ret = stream->read_subbuffer_ops.on_wake_up(stream);
- if (ret) {
- goto end;
- }
- }
-
- /*
- * If the stream was flagged to be ready for rotation before we extract
- * the next packet, rotate it now.
- */
- if (stream->rotate_ready) {
- DBG("Rotate stream before consuming data");
- ret = lttng_consumer_rotate_stream(ctx, stream);
- if (ret < 0) {
- ERR("Stream rotation error before consuming data");
- goto end;
- }
- }
-
- get_next_status = stream->read_subbuffer_ops.get_next_subbuffer(
- stream, &subbuffer);
- switch (get_next_status) {
- case GET_NEXT_SUBBUFFER_STATUS_OK:
- break;
- case GET_NEXT_SUBBUFFER_STATUS_NO_DATA:
- /* Not an error. */
- ret = 0;
- goto sleep_stream;
- case GET_NEXT_SUBBUFFER_STATUS_ERROR:
- ret = -1;
- goto end;
- default:
- abort();
- }
-
- ret = stream->read_subbuffer_ops.pre_consume_subbuffer(
- stream, &subbuffer);
- if (ret) {
- goto error_put_subbuf;
- }
-
- written_bytes = stream->read_subbuffer_ops.consume_subbuffer(
- ctx, stream, &subbuffer);
- if (written_bytes <= 0) {
- ERR("Error consuming subbuffer: (%zd)", written_bytes);
- ret = (int) written_bytes;
- goto error_put_subbuf;
- }
-
- ret = stream->read_subbuffer_ops.put_next_subbuffer(stream, &subbuffer);
- if (ret) {
- goto end;
- }
-
- ret = post_consume(stream, &subbuffer, ctx);
- if (ret) {
- goto end;
- }
-
- /*
- * After extracting the packet, we check if the stream is now ready to
- * be rotated and perform the action immediately.
- *
- * Don't overwrite `ret` as callers expect the number of bytes
- * consumed to be returned on success.
- */
- rotation_ret = lttng_consumer_stream_is_rotate_ready(stream);
- if (rotation_ret == 1) {
- rotation_ret = lttng_consumer_rotate_stream(ctx, stream);
- if (rotation_ret < 0) {
- ret = rotation_ret;
- ERR("Stream rotation error after consuming data");
- goto end;
- }
-
- } else if (rotation_ret < 0) {
- ret = rotation_ret;
- ERR("Failed to check if stream was ready to rotate after consuming data");
- goto end;
- }
-
-sleep_stream:
- if (stream->read_subbuffer_ops.on_sleep) {
- stream->read_subbuffer_ops.on_sleep(stream, ctx);
- }
-
- ret = written_bytes;
-end:
- if (!locked_by_caller) {
- stream->read_subbuffer_ops.unlock(stream);
- }
-
- return ret;
-error_put_subbuf:
- (void) stream->read_subbuffer_ops.put_next_subbuffer(stream, &subbuffer);
- goto end;
-}
-
-int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream)
-{
- switch (the_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");
- abort();
- return -ENOSYS;
- }
-}
-
-/*
- * Allocate and set consumer data hash tables.
- */
-int lttng_consumer_init(void)
-{
- the_consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!the_consumer_data.channel_ht) {
- goto error;
- }
-
- the_consumer_data.channels_by_session_id_ht =
- lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!the_consumer_data.channels_by_session_id_ht) {
- goto error;
- }
-
- the_consumer_data.relayd_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!the_consumer_data.relayd_ht) {
- goto error;
- }
-
- the_consumer_data.stream_list_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!the_consumer_data.stream_list_ht) {
- goto error;
- }
-
- the_consumer_data.stream_per_chan_id_ht =
- lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!the_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;
- }
-
- the_consumer_data.chunk_registry = lttng_trace_chunk_registry_create();
- if (!the_consumer_data.chunk_registry) {
- 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.
- */
- void 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;
-
- LTTNG_ASSERT(ctx);
- LTTNG_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) {
- LTTNG_ASSERT(sock_type == LTTNG_STREAM_CONTROL);
- /* Not found. Allocate one. */
- relayd = consumer_allocate_relayd_sock_pair(net_seq_idx);
- if (relayd == NULL) {
- 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.
- */
- LTTNG_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);
- goto error_nosignal;
- }
-
- /* Get relayd socket from session daemon */
- ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1);
- if (ret != sizeof(fd)) {
- 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;
- /* 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;
- /* 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_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 gave the ownership of the fd to the relayd structure. Set the
- * fd to -1 so we don't call close() on it in the error path below.
- */
- fd = -1;
-
- /* 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.
- */
- relayd->ctx = ctx;
- add_relayd(relayd);
-
- /* All good! */
- return;
-
-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);
- }
-}
-
-/*
- * 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(the_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(&the_consumer_data.lock);
-
- switch (the_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");
- abort();
- }
-
- /* Ease our life a bit */
- ht = the_consumer_data.stream_list_ht;
-
- 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) {
- pthread_mutex_lock(&stream->lock);
-
- /*
- * 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;
- }
- }
-
- pthread_mutex_unlock(&stream->lock);
- }
-
- relayd = find_relayd_by_session_id(id);
- if (relayd) {
- unsigned int is_data_inflight = 0;
-
- /* 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);
- if (ret < 0) {
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- /* 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 (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);
- }
-
- if (ret == 1) {
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- goto data_pending;
- } else if (ret < 0) {
- ERR("Relayd data pending failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- goto data_not_pending;
- }
- }
-
- /* Send end command for data pending. */
- 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) {
- ERR("Relayd end data pending failed. Cleaning up relayd %" PRIu64".", relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- 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(&the_consumer_data.lock);
- rcu_read_unlock();
- return 0;
-
-data_pending:
- /* Data is still being extracted from buffers. */
- pthread_mutex_unlock(&the_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;
-
- LTTNG_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 - lttng_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;
-}
-
-/* Stream lock must be held by the caller. */
-static int sample_stream_positions(struct lttng_consumer_stream *stream,
- unsigned long *produced, unsigned long *consumed)
-{
- int ret;
-
- ASSERT_LOCKED(stream->lock);
-
- ret = lttng_consumer_sample_snapshot_positions(stream);
- if (ret < 0) {
- ERR("Failed to sample snapshot positions");
- goto end;
- }
-
- ret = lttng_consumer_get_produced_snapshot(stream, produced);
- if (ret < 0) {
- ERR("Failed to sample produced position");
- goto end;
- }
-
- ret = lttng_consumer_get_consumed_snapshot(stream, consumed);
- if (ret < 0) {
- ERR("Failed to sample consumed position");
- goto end;
- }
-
-end:
- return ret;
-}
-
-/*
- * Sample the rotate position for all the streams of a channel. If a stream
- * is already at the rotate position (produced == consumed), we flag it as
- * ready for rotation. The rotation of ready streams occurs after we have
- * replied to the session daemon that we have finished sampling the positions.
- * Must be called with RCU read-side lock held to ensure existence of channel.
- *
- * Returns 0 on success, < 0 on error
- */
-int lttng_consumer_rotate_channel(struct lttng_consumer_channel *channel,
- uint64_t key, uint64_t relayd_id, uint32_t metadata,
- struct lttng_consumer_local_data *ctx)
-{
- int ret;
- struct lttng_consumer_stream *stream;
- struct lttng_ht_iter iter;
- struct lttng_ht *ht = the_consumer_data.stream_per_chan_id_ht;
- struct lttng_dynamic_array stream_rotation_positions;
- uint64_t next_chunk_id, stream_count = 0;
- enum lttng_trace_chunk_status chunk_status;
- const bool is_local_trace = relayd_id == -1ULL;
- struct consumer_relayd_sock_pair *relayd = NULL;
- bool rotating_to_new_chunk = true;
- /* Array of `struct lttng_consumer_stream *` */
- struct lttng_dynamic_pointer_array streams_packet_to_open;
- size_t stream_idx;
-
- DBG("Consumer sample rotate position for channel %" PRIu64, key);
-
- lttng_dynamic_array_init(&stream_rotation_positions,
- sizeof(struct relayd_stream_rotation_position), NULL);
- lttng_dynamic_pointer_array_init(&streams_packet_to_open, NULL);
-
- rcu_read_lock();
-
- pthread_mutex_lock(&channel->lock);
- LTTNG_ASSERT(channel->trace_chunk);
- chunk_status = lttng_trace_chunk_get_id(channel->trace_chunk,
- &next_chunk_id);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret = -1;
- goto end_unlock_channel;
- }
-
- 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) {
- unsigned long produced_pos = 0, consumed_pos = 0;
-
- health_code_update();
-
- /*
- * Lock stream because we are about to change its state.
- */
- pthread_mutex_lock(&stream->lock);
-
- if (stream->trace_chunk == stream->chan->trace_chunk) {
- rotating_to_new_chunk = false;
- }
-
- /*
- * Do not flush a packet when rotating from a NULL trace
- * chunk. The stream has no means to output data, and the prior
- * rotation which rotated to NULL performed that side-effect
- * already. No new data can be produced when a stream has no
- * associated trace chunk (e.g. a stop followed by a rotate).
- */
- if (stream->trace_chunk) {
- bool flush_active;
-
- if (stream->metadata_flag) {
- /*
- * Don't produce an empty metadata packet,
- * simply close the current one.
- *
- * Metadata is regenerated on every trace chunk
- * switch; there is no concern that no data was
- * produced.
- */
- flush_active = true;
- } else {
- /*
- * Only flush an empty packet if the "packet
- * open" could not be performed on transition
- * to a new trace chunk and no packets were
- * consumed within the chunk's lifetime.
- */
- if (stream->opened_packet_in_current_trace_chunk) {
- flush_active = true;
- } else {
- /*
- * Stream could have been full at the
- * time of rotation, but then have had
- * no activity at all.
- *
- * It is important to flush a packet
- * to prevent 0-length files from being
- * produced as most viewers choke on
- * them.
- *
- * Unfortunately viewers will not be
- * able to know that tracing was active
- * for this stream during this trace
- * chunk's lifetime.
- */
- ret = sample_stream_positions(stream, &produced_pos, &consumed_pos);
- if (ret) {
- goto end_unlock_stream;
- }
-
- /*
- * Don't flush an empty packet if data
- * was produced; it will be consumed
- * before the rotation completes.
- */
- flush_active = produced_pos != consumed_pos;
- if (!flush_active) {
- const char *trace_chunk_name;
- uint64_t trace_chunk_id;
-
- chunk_status = lttng_trace_chunk_get_name(
- stream->trace_chunk,
- &trace_chunk_name,
- NULL);
- if (chunk_status == LTTNG_TRACE_CHUNK_STATUS_NONE) {
- trace_chunk_name = "none";
- }
-
- /*
- * Consumer trace chunks are
- * never anonymous.
- */
- chunk_status = lttng_trace_chunk_get_id(
- stream->trace_chunk,
- &trace_chunk_id);
- LTTNG_ASSERT(chunk_status ==
- LTTNG_TRACE_CHUNK_STATUS_OK);
-
- DBG("Unable to open packet for stream during trace chunk's lifetime. "
- "Flushing an empty packet to prevent an empty file from being created: "
- "stream id = %" PRIu64 ", trace chunk name = `%s`, trace chunk id = %" PRIu64,
- stream->key, trace_chunk_name, trace_chunk_id);
- }
- }
- }
-
- /*
- * Close the current packet before sampling the
- * ring buffer positions.
- */
- ret = consumer_stream_flush_buffer(stream, flush_active);
- if (ret < 0) {
- ERR("Failed to flush stream %" PRIu64 " during channel rotation",
- stream->key);
- goto end_unlock_stream;
- }
- }
-
- ret = lttng_consumer_take_snapshot(stream);
- if (ret < 0 && ret != -ENODATA && ret != -EAGAIN) {
- ERR("Failed to sample snapshot position during channel rotation");
- goto end_unlock_stream;
- }
- if (!ret) {
- ret = lttng_consumer_get_produced_snapshot(stream,
- &produced_pos);
- if (ret < 0) {
- ERR("Failed to sample produced position during channel rotation");
- goto end_unlock_stream;
- }
-
- ret = lttng_consumer_get_consumed_snapshot(stream,
- &consumed_pos);
- if (ret < 0) {
- ERR("Failed to sample consumed position during channel rotation");
- goto end_unlock_stream;
- }
- }
- /*
- * Align produced position on the start-of-packet boundary of the first
- * packet going into the next trace chunk.
- */
- produced_pos = lttng_align_floor(produced_pos, stream->max_sb_size);
- if (consumed_pos == produced_pos) {
- DBG("Set rotate ready for stream %" PRIu64 " produced = %lu consumed = %lu",
- stream->key, produced_pos, consumed_pos);
- stream->rotate_ready = true;
- } else {
- DBG("Different consumed and produced positions "
- "for stream %" PRIu64 " produced = %lu consumed = %lu",
- stream->key, produced_pos, consumed_pos);
- }
- /*
- * The rotation position is based on the packet_seq_num of the
- * packet following the last packet that was consumed for this
- * stream, incremented by the offset between produced and
- * consumed positions. This rotation position is a lower bound
- * (inclusive) at which the next trace chunk starts. Since it
- * is a lower bound, it is OK if the packet_seq_num does not
- * correspond exactly to the same packet identified by the
- * consumed_pos, which can happen in overwrite mode.
- */
- if (stream->sequence_number_unavailable) {
- /*
- * Rotation should never be performed on a session which
- * interacts with a pre-2.8 lttng-modules, which does
- * not implement packet sequence number.
- */
- ERR("Failure to rotate stream %" PRIu64 ": sequence number unavailable",
- stream->key);
- ret = -1;
- goto end_unlock_stream;
- }
- stream->rotate_position = stream->last_sequence_number + 1 +
- ((produced_pos - consumed_pos) / stream->max_sb_size);
- DBG("Set rotation position for stream %" PRIu64 " at position %" PRIu64,
- stream->key, stream->rotate_position);
-
- if (!is_local_trace) {
- /*
- * The relay daemon control protocol expects a rotation
- * position as "the sequence number of the first packet
- * _after_ the current trace chunk".
- */
- const struct relayd_stream_rotation_position position = {
- .stream_id = stream->relayd_stream_id,
- .rotate_at_seq_num = stream->rotate_position,
- };
-
- ret = lttng_dynamic_array_add_element(
- &stream_rotation_positions,
- &position);
- if (ret) {
- ERR("Failed to allocate stream rotation position");
- goto end_unlock_stream;
- }
- stream_count++;
- }
-
- stream->opened_packet_in_current_trace_chunk = false;
-
- if (rotating_to_new_chunk && !stream->metadata_flag) {
- /*
- * Attempt to flush an empty packet as close to the
- * rotation point as possible. In the event where a
- * stream remains inactive after the rotation point,
- * this ensures that the new trace chunk has a
- * beginning timestamp set at the begining of the
- * trace chunk instead of only creating an empty
- * packet when the trace chunk is stopped.
- *
- * This indicates to the viewers that the stream
- * was being recorded, but more importantly it
- * allows viewers to determine a useable trace
- * intersection.
- *
- * This presents a problem in the case where the
- * ring-buffer is completely full.
- *
- * Consider the following scenario:
- * - The consumption of data is slow (slow network,
- * for instance),
- * - The ring buffer is full,
- * - A rotation is initiated,
- * - The flush below does nothing (no space left to
- * open a new packet),
- * - The other streams rotate very soon, and new
- * data is produced in the new chunk,
- * - This stream completes its rotation long after the
- * rotation was initiated
- * - The session is stopped before any event can be
- * produced in this stream's buffers.
- *
- * The resulting trace chunk will have a single packet
- * temporaly at the end of the trace chunk for this
- * stream making the stream intersection more narrow
- * than it should be.
- *
- * To work-around this, an empty flush is performed
- * after the first consumption of a packet during a
- * rotation if open_packet fails. The idea is that
- * consuming a packet frees enough space to switch
- * packets in this scenario and allows the tracer to
- * "stamp" the beginning of the new trace chunk at the
- * earliest possible point.
- *
- * The packet open is performed after the channel
- * rotation to ensure that no attempt to open a packet
- * is performed in a stream that has no active trace
- * chunk.
- */
- ret = lttng_dynamic_pointer_array_add_pointer(
- &streams_packet_to_open, stream);
- if (ret) {
- PERROR("Failed to add a stream pointer to array of streams in which to open a packet");
- ret = -1;
- goto end_unlock_stream;
- }
- }
-
- pthread_mutex_unlock(&stream->lock);
- }
- stream = NULL;
-
- if (!is_local_trace) {
- relayd = consumer_find_relayd(relayd_id);
- if (!relayd) {
- ERR("Failed to find relayd %" PRIu64, relayd_id);
- ret = -1;
- goto end_unlock_channel;
- }
-
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_rotate_streams(&relayd->control_sock, stream_count,
- rotating_to_new_chunk ? &next_chunk_id : NULL,
- (const struct relayd_stream_rotation_position *)
- stream_rotation_positions.buffer
- .data);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- ERR("Relayd rotate stream failed. Cleaning up relayd %" PRIu64,
- relayd->net_seq_idx);
- lttng_consumer_cleanup_relayd(relayd);
- goto end_unlock_channel;
- }
- }
-
- for (stream_idx = 0;
- stream_idx < lttng_dynamic_pointer_array_get_count(
- &streams_packet_to_open);
- stream_idx++) {
- enum consumer_stream_open_packet_status status;
-
- stream = lttng_dynamic_pointer_array_get_pointer(
- &streams_packet_to_open, stream_idx);
-
- pthread_mutex_lock(&stream->lock);
- status = consumer_stream_open_packet(stream);
- pthread_mutex_unlock(&stream->lock);
- switch (status) {
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_OPENED:
- DBG("Opened a packet after a rotation: stream id = %" PRIu64
- ", channel name = %s, session id = %" PRIu64,
- stream->key, stream->chan->name,
- stream->chan->session_id);
- break;
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_NO_SPACE:
- /*
- * Can't open a packet as there is no space left
- * in the buffer. A new packet will be opened
- * once one has been consumed.
- */
- DBG("No space left to open a packet after a rotation: stream id = %" PRIu64
- ", channel name = %s, session id = %" PRIu64,
- stream->key, stream->chan->name,
- stream->chan->session_id);
- break;
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_ERROR:
- /* Logged by callee. */
- ret = -1;
- goto end_unlock_channel;
- default:
- abort();
- }
- }
-
- pthread_mutex_unlock(&channel->lock);
- ret = 0;
- goto end;
-
-end_unlock_stream:
- pthread_mutex_unlock(&stream->lock);
-end_unlock_channel:
- pthread_mutex_unlock(&channel->lock);
-end:
- rcu_read_unlock();
- lttng_dynamic_array_reset(&stream_rotation_positions);
- lttng_dynamic_pointer_array_reset(&streams_packet_to_open);
- return ret;
-}
-
-static
-int consumer_clear_buffer(struct lttng_consumer_stream *stream)
-{
- int ret = 0;
- unsigned long consumed_pos_before, consumed_pos_after;
-
- ret = lttng_consumer_sample_snapshot_positions(stream);
- if (ret < 0) {
- ERR("Taking snapshot positions");
- goto end;
- }
-
- ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos_before);
- if (ret < 0) {
- ERR("Consumed snapshot position");
- goto end;
- }
-
- switch (the_consumer_data.type) {
- case LTTNG_CONSUMER_KERNEL:
- ret = kernctl_buffer_clear(stream->wait_fd);
- if (ret < 0) {
- ERR("Failed to clear kernel stream (ret = %d)", ret);
- goto end;
- }
- break;
- case LTTNG_CONSUMER32_UST:
- case LTTNG_CONSUMER64_UST:
- ret = lttng_ustconsumer_clear_buffer(stream);
- if (ret < 0) {
- ERR("Failed to clear ust stream (ret = %d)", ret);
- goto end;
- }
- break;
- default:
- ERR("Unknown consumer_data type");
- abort();
- }
-
- ret = lttng_consumer_sample_snapshot_positions(stream);
- if (ret < 0) {
- ERR("Taking snapshot positions");
- goto end;
- }
- ret = lttng_consumer_get_consumed_snapshot(stream, &consumed_pos_after);
- if (ret < 0) {
- ERR("Consumed snapshot position");
- goto end;
- }
- DBG("clear: before: %lu after: %lu", consumed_pos_before, consumed_pos_after);
-end:
- return ret;
-}
-
-static
-int consumer_clear_stream(struct lttng_consumer_stream *stream)
-{
- int ret;
-
- ret = consumer_stream_flush_buffer(stream, 1);
- if (ret < 0) {
- ERR("Failed to flush stream %" PRIu64 " during channel clear",
- stream->key);
- ret = LTTCOMM_CONSUMERD_FATAL;
- goto error;
- }
-
- ret = consumer_clear_buffer(stream);
- if (ret < 0) {
- ERR("Failed to clear stream %" PRIu64 " during channel clear",
- stream->key);
- ret = LTTCOMM_CONSUMERD_FATAL;
- goto error;
- }
-
- ret = LTTCOMM_CONSUMERD_SUCCESS;
-error:
- return ret;
-}
-
-static
-int consumer_clear_unmonitored_channel(struct lttng_consumer_channel *channel)
-{
- int ret;
- struct lttng_consumer_stream *stream;
-
- rcu_read_lock();
- pthread_mutex_lock(&channel->lock);
- cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
- health_code_update();
- pthread_mutex_lock(&stream->lock);
- ret = consumer_clear_stream(stream);
- if (ret) {
- goto error_unlock;
- }
- pthread_mutex_unlock(&stream->lock);
- }
- pthread_mutex_unlock(&channel->lock);
- rcu_read_unlock();
- return 0;
-
-error_unlock:
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&channel->lock);
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Check if a stream is ready to be rotated after extracting it.
- *
- * Return 1 if it is ready for rotation, 0 if it is not, a negative value on
- * error. Stream lock must be held.
- */
-int lttng_consumer_stream_is_rotate_ready(struct lttng_consumer_stream *stream)
-{
- DBG("Check is rotate ready for stream %" PRIu64
- " ready %u rotate_position %" PRIu64
- " last_sequence_number %" PRIu64,
- stream->key, stream->rotate_ready,
- stream->rotate_position, stream->last_sequence_number);
- if (stream->rotate_ready) {
- return 1;
- }
-
- /*
- * If packet seq num is unavailable, it means we are interacting
- * with a pre-2.8 lttng-modules which does not implement the
- * sequence number. Rotation should never be used by sessiond in this
- * scenario.
- */
- if (stream->sequence_number_unavailable) {
- ERR("Internal error: rotation used on stream %" PRIu64
- " with unavailable sequence number",
- stream->key);
- return -1;
- }
-
- if (stream->rotate_position == -1ULL ||
- stream->last_sequence_number == -1ULL) {
- return 0;
- }
-
- /*
- * Rotate position not reached yet. The stream rotate position is
- * the position of the next packet belonging to the next trace chunk,
- * but consumerd considers rotation ready when reaching the last
- * packet of the current chunk, hence the "rotate_position - 1".
- */
-
- DBG("Check is rotate ready for stream %" PRIu64
- " last_sequence_number %" PRIu64
- " rotate_position %" PRIu64,
- stream->key, stream->last_sequence_number,
- stream->rotate_position);
- if (stream->last_sequence_number >= stream->rotate_position - 1) {
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Reset the state for a stream after a rotation occurred.
- */
-void lttng_consumer_reset_stream_rotate_state(struct lttng_consumer_stream *stream)
-{
- DBG("lttng_consumer_reset_stream_rotate_state for stream %" PRIu64,
- stream->key);
- stream->rotate_position = -1ULL;
- stream->rotate_ready = false;
-}
-
-/*
- * Perform the rotation a local stream file.
- */
-static
-int rotate_local_stream(struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream)
-{
- int ret = 0;
-
- DBG("Rotate local stream: stream key %" PRIu64 ", channel key %" PRIu64,
- stream->key,
- stream->chan->key);
- stream->tracefile_size_current = 0;
- stream->tracefile_count_current = 0;
-
- if (stream->out_fd >= 0) {
- ret = close(stream->out_fd);
- if (ret) {
- PERROR("Failed to close stream out_fd of channel \"%s\"",
- stream->chan->name);
- }
- stream->out_fd = -1;
- }
-
- if (stream->index_file) {
- lttng_index_file_put(stream->index_file);
- stream->index_file = NULL;
- }
-
- if (!stream->trace_chunk) {
- goto end;
- }
-
- ret = consumer_stream_create_output_files(stream, true);
-end:
- return ret;
-}
-
-/*
- * Performs the stream rotation for the rotate session feature if needed.
- * It must be called with the channel and stream locks held.
- *
- * Return 0 on success, a negative number of error.
- */
-int lttng_consumer_rotate_stream(struct lttng_consumer_local_data *ctx,
- struct lttng_consumer_stream *stream)
-{
- int ret;
-
- DBG("Consumer rotate stream %" PRIu64, stream->key);
-
- /*
- * Update the stream's 'current' chunk to the session's (channel)
- * now-current chunk.
- */
- lttng_trace_chunk_put(stream->trace_chunk);
- if (stream->chan->trace_chunk == stream->trace_chunk) {
- /*
- * A channel can be rotated and not have a "next" chunk
- * to transition to. In that case, the channel's "current chunk"
- * has not been closed yet, but it has not been updated to
- * a "next" trace chunk either. Hence, the stream, like its
- * parent channel, becomes part of no chunk and can't output
- * anything until a new trace chunk is created.
- */
- stream->trace_chunk = NULL;
- } else if (stream->chan->trace_chunk &&
- !lttng_trace_chunk_get(stream->chan->trace_chunk)) {
- ERR("Failed to acquire a reference to channel's trace chunk during stream rotation");
- ret = -1;
- goto error;
- } else {
- /*
- * Update the stream's trace chunk to its parent channel's
- * current trace chunk.
- */
- stream->trace_chunk = stream->chan->trace_chunk;
- }
-
- if (stream->net_seq_idx == (uint64_t) -1ULL) {
- ret = rotate_local_stream(ctx, stream);
- if (ret < 0) {
- ERR("Failed to rotate stream, ret = %i", ret);
- goto error;
- }
- }
-
- if (stream->metadata_flag && stream->trace_chunk) {
- /*
- * If the stream has transitioned to a new trace
- * chunk, the metadata should be re-dumped to the
- * newest chunk.
- *
- * However, it is possible for a stream to transition to
- * a "no-chunk" state. This can happen if a rotation
- * occurs on an inactive session. In such cases, the metadata
- * regeneration will happen when the next trace chunk is
- * created.
- */
- ret = consumer_metadata_stream_dump(stream);
- if (ret) {
- goto error;
- }
- }
- lttng_consumer_reset_stream_rotate_state(stream);
-
- ret = 0;
-
-error:
- return ret;
-}
-
-/*
- * Rotate all the ready streams now.
- *
- * This is especially important for low throughput streams that have already
- * been consumed, we cannot wait for their next packet to perform the
- * rotation.
- * Need to be called with RCU read-side lock held to ensure existence of
- * channel.
- *
- * Returns 0 on success, < 0 on error
- */
-int lttng_consumer_rotate_ready_streams(struct lttng_consumer_channel *channel,
- uint64_t key, struct lttng_consumer_local_data *ctx)
-{
- int ret;
- struct lttng_consumer_stream *stream;
- struct lttng_ht_iter iter;
- struct lttng_ht *ht = the_consumer_data.stream_per_chan_id_ht;
-
- rcu_read_lock();
-
- DBG("Consumer rotate ready streams in channel %" PRIu64, key);
-
- 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) {
- health_code_update();
-
- pthread_mutex_lock(&stream->chan->lock);
- pthread_mutex_lock(&stream->lock);
-
- if (!stream->rotate_ready) {
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&stream->chan->lock);
- continue;
- }
- DBG("Consumer rotate ready stream %" PRIu64, stream->key);
-
- ret = lttng_consumer_rotate_stream(ctx, stream);
- pthread_mutex_unlock(&stream->lock);
- pthread_mutex_unlock(&stream->chan->lock);
- if (ret) {
- goto end;
- }
- }
-
- ret = 0;
-
-end:
- rcu_read_unlock();
- return ret;
-}
-
-enum lttcomm_return_code lttng_consumer_init_command(
- struct lttng_consumer_local_data *ctx,
- const lttng_uuid sessiond_uuid)
-{
- enum lttcomm_return_code ret;
- char uuid_str[LTTNG_UUID_STR_LEN];
-
- if (ctx->sessiond_uuid.is_set) {
- ret = LTTCOMM_CONSUMERD_ALREADY_SET;
- goto end;
- }
-
- ctx->sessiond_uuid.is_set = true;
- memcpy(ctx->sessiond_uuid.value, sessiond_uuid, sizeof(lttng_uuid));
- ret = LTTCOMM_CONSUMERD_SUCCESS;
- lttng_uuid_to_str(sessiond_uuid, uuid_str);
- DBG("Received session daemon UUID: %s", uuid_str);
-end:
- return ret;
-}
-
-enum lttcomm_return_code lttng_consumer_create_trace_chunk(
- const uint64_t *relayd_id, uint64_t session_id,
- uint64_t chunk_id,
- time_t chunk_creation_timestamp,
- const char *chunk_override_name,
- const struct lttng_credentials *credentials,
- struct lttng_directory_handle *chunk_directory_handle)
-{
- int ret;
- enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
- struct lttng_trace_chunk *created_chunk = NULL, *published_chunk = NULL;
- enum lttng_trace_chunk_status chunk_status;
- char relayd_id_buffer[MAX_INT_DEC_LEN(*relayd_id)];
- char creation_timestamp_buffer[ISO8601_STR_LEN];
- const char *relayd_id_str = "(none)";
- const char *creation_timestamp_str;
- struct lttng_ht_iter iter;
- struct lttng_consumer_channel *channel;
-
- if (relayd_id) {
- /* Only used for logging purposes. */
- ret = snprintf(relayd_id_buffer, sizeof(relayd_id_buffer),
- "%" PRIu64, *relayd_id);
- if (ret > 0 && ret < sizeof(relayd_id_buffer)) {
- relayd_id_str = relayd_id_buffer;
- } else {
- relayd_id_str = "(formatting error)";
- }
- }
-
- /* Local protocol error. */
- LTTNG_ASSERT(chunk_creation_timestamp);
- ret = time_to_iso8601_str(chunk_creation_timestamp,
- creation_timestamp_buffer,
- sizeof(creation_timestamp_buffer));
- creation_timestamp_str = !ret ? creation_timestamp_buffer :
- "(formatting error)";
-
- DBG("Consumer create trace chunk command: relay_id = %s"
- ", session_id = %" PRIu64 ", chunk_id = %" PRIu64
- ", chunk_override_name = %s"
- ", chunk_creation_timestamp = %s",
- relayd_id_str, session_id, chunk_id,
- chunk_override_name ? : "(none)",
- creation_timestamp_str);
-
- /*
- * The trace chunk registry, as used by the consumer daemon, implicitly
- * owns the trace chunks. This is only needed in the consumer since
- * the consumer has no notion of a session beyond session IDs being
- * used to identify other objects.
- *
- * The lttng_trace_chunk_registry_publish() call below provides a
- * reference which is not released; it implicitly becomes the session
- * daemon's reference to the chunk in the consumer daemon.
- *
- * The lifetime of trace chunks in the consumer daemon is managed by
- * the session daemon through the LTTNG_CONSUMER_CREATE_TRACE_CHUNK
- * and LTTNG_CONSUMER_DESTROY_TRACE_CHUNK commands.
- */
- created_chunk = lttng_trace_chunk_create(chunk_id,
- chunk_creation_timestamp, NULL);
- if (!created_chunk) {
- ERR("Failed to create trace chunk");
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error;
- }
-
- if (chunk_override_name) {
- chunk_status = lttng_trace_chunk_override_name(created_chunk,
- chunk_override_name);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error;
- }
- }
-
- if (chunk_directory_handle) {
- chunk_status = lttng_trace_chunk_set_credentials(created_chunk,
- credentials);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ERR("Failed to set trace chunk credentials");
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error;
- }
- /*
- * The consumer daemon has no ownership of the chunk output
- * directory.
- */
- chunk_status = lttng_trace_chunk_set_as_user(created_chunk,
- chunk_directory_handle);
- chunk_directory_handle = NULL;
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ERR("Failed to set trace chunk's directory handle");
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error;
- }
- }
-
- published_chunk = lttng_trace_chunk_registry_publish_chunk(
- the_consumer_data.chunk_registry, session_id,
- created_chunk);
- lttng_trace_chunk_put(created_chunk);
- created_chunk = NULL;
- if (!published_chunk) {
- ERR("Failed to publish trace chunk");
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error;
- }
-
- rcu_read_lock();
- cds_lfht_for_each_entry_duplicate(
- the_consumer_data.channels_by_session_id_ht->ht,
- the_consumer_data.channels_by_session_id_ht->hash_fct(
- &session_id, lttng_ht_seed),
- the_consumer_data.channels_by_session_id_ht->match_fct,
- &session_id, &iter.iter, channel,
- channels_by_session_id_ht_node.node) {
- ret = lttng_consumer_channel_set_trace_chunk(channel,
- published_chunk);
- if (ret) {
- /*
- * Roll-back the creation of this chunk.
- *
- * This is important since the session daemon will
- * assume that the creation of this chunk failed and
- * will never ask for it to be closed, resulting
- * in a leak and an inconsistent state for some
- * channels.
- */
- enum lttcomm_return_code close_ret;
- char path[LTTNG_PATH_MAX];
-
- DBG("Failed to set new trace chunk on existing channels, rolling back");
- close_ret = lttng_consumer_close_trace_chunk(relayd_id,
- session_id, chunk_id,
- chunk_creation_timestamp, NULL,
- path);
- if (close_ret != LTTCOMM_CONSUMERD_SUCCESS) {
- ERR("Failed to roll-back the creation of new chunk: session_id = %" PRIu64 ", chunk_id = %" PRIu64,
- session_id, chunk_id);
- }
-
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- break;
- }
- }
-
- if (relayd_id) {
- struct consumer_relayd_sock_pair *relayd;
-
- relayd = consumer_find_relayd(*relayd_id);
- if (relayd) {
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_create_trace_chunk(
- &relayd->control_sock, published_chunk);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- } else {
- ERR("Failed to find relay daemon socket: relayd_id = %" PRIu64, *relayd_id);
- }
-
- if (!relayd || ret) {
- enum lttcomm_return_code close_ret;
- char path[LTTNG_PATH_MAX];
-
- close_ret = lttng_consumer_close_trace_chunk(relayd_id,
- session_id,
- chunk_id,
- chunk_creation_timestamp,
- NULL, path);
- if (close_ret != LTTCOMM_CONSUMERD_SUCCESS) {
- ERR("Failed to roll-back the creation of new chunk: session_id = %" PRIu64 ", chunk_id = %" PRIu64,
- session_id,
- chunk_id);
- }
-
- ret_code = LTTCOMM_CONSUMERD_CREATE_TRACE_CHUNK_FAILED;
- goto error_unlock;
- }
- }
-error_unlock:
- rcu_read_unlock();
-error:
- /* Release the reference returned by the "publish" operation. */
- lttng_trace_chunk_put(published_chunk);
- lttng_trace_chunk_put(created_chunk);
- return ret_code;
-}
-
-enum lttcomm_return_code lttng_consumer_close_trace_chunk(
- const uint64_t *relayd_id, uint64_t session_id,
- uint64_t chunk_id, time_t chunk_close_timestamp,
- const enum lttng_trace_chunk_command_type *close_command,
- char *path)
-{
- enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS;
- struct lttng_trace_chunk *chunk;
- char relayd_id_buffer[MAX_INT_DEC_LEN(*relayd_id)];
- const char *relayd_id_str = "(none)";
- const char *close_command_name = "none";
- struct lttng_ht_iter iter;
- struct lttng_consumer_channel *channel;
- enum lttng_trace_chunk_status chunk_status;
-
- if (relayd_id) {
- int ret;
-
- /* Only used for logging purposes. */
- ret = snprintf(relayd_id_buffer, sizeof(relayd_id_buffer),
- "%" PRIu64, *relayd_id);
- if (ret > 0 && ret < sizeof(relayd_id_buffer)) {
- relayd_id_str = relayd_id_buffer;
- } else {
- relayd_id_str = "(formatting error)";
- }
- }
- if (close_command) {
- close_command_name = lttng_trace_chunk_command_type_get_name(
- *close_command);
- }
-
- DBG("Consumer close trace chunk command: relayd_id = %s"
- ", session_id = %" PRIu64 ", chunk_id = %" PRIu64
- ", close command = %s",
- relayd_id_str, session_id, chunk_id,
- close_command_name);
-
- chunk = lttng_trace_chunk_registry_find_chunk(
- the_consumer_data.chunk_registry, session_id, chunk_id);
- if (!chunk) {
- ERR("Failed to find chunk: session_id = %" PRIu64
- ", chunk_id = %" PRIu64,
- session_id, chunk_id);
- ret_code = LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK;
- goto end;
- }
-
- chunk_status = lttng_trace_chunk_set_close_timestamp(chunk,
- chunk_close_timestamp);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret_code = LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED;
- goto end;
- }
-
- if (close_command) {
- chunk_status = lttng_trace_chunk_set_close_command(
- chunk, *close_command);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret_code = LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED;
- goto end;
- }
- }
-
- /*
- * chunk is now invalid to access as we no longer hold a reference to
- * it; it is only kept around to compare it (by address) to the
- * current chunk found in the session's channels.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(the_consumer_data.channel_ht->ht, &iter.iter,
- channel, node.node) {
- int ret;
-
- /*
- * Only change the channel's chunk to NULL if it still
- * references the chunk being closed. The channel may
- * reference a newer channel in the case of a session
- * rotation. When a session rotation occurs, the "next"
- * chunk is created before the "current" chunk is closed.
- */
- if (channel->trace_chunk != chunk) {
- continue;
- }
- ret = lttng_consumer_channel_set_trace_chunk(channel, NULL);
- if (ret) {
- /*
- * Attempt to close the chunk on as many channels as
- * possible.
- */
- ret_code = LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED;
- }
- }
-
- if (relayd_id) {
- int ret;
- struct consumer_relayd_sock_pair *relayd;
-
- relayd = consumer_find_relayd(*relayd_id);
- if (relayd) {
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_close_trace_chunk(
- &relayd->control_sock, chunk,
- path);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- } else {
- ERR("Failed to find relay daemon socket: relayd_id = %" PRIu64,
- *relayd_id);
- }
-
- if (!relayd || ret) {
- ret_code = LTTCOMM_CONSUMERD_CLOSE_TRACE_CHUNK_FAILED;
- goto error_unlock;
- }
- }
-error_unlock:
- rcu_read_unlock();
-end:
- /*
- * Release the reference returned by the "find" operation and
- * the session daemon's implicit reference to the chunk.
- */
- lttng_trace_chunk_put(chunk);
- lttng_trace_chunk_put(chunk);
-
- return ret_code;
-}
-
-enum lttcomm_return_code lttng_consumer_trace_chunk_exists(
- const uint64_t *relayd_id, uint64_t session_id,
- uint64_t chunk_id)
-{
- int ret;
- enum lttcomm_return_code ret_code;
- char relayd_id_buffer[MAX_INT_DEC_LEN(*relayd_id)];
- const char *relayd_id_str = "(none)";
- const bool is_local_trace = !relayd_id;
- struct consumer_relayd_sock_pair *relayd = NULL;
- bool chunk_exists_local, chunk_exists_remote;
-
- if (relayd_id) {
- /* Only used for logging purposes. */
- ret = snprintf(relayd_id_buffer, sizeof(relayd_id_buffer),
- "%" PRIu64, *relayd_id);
- if (ret > 0 && ret < sizeof(relayd_id_buffer)) {
- relayd_id_str = relayd_id_buffer;
- } else {
- relayd_id_str = "(formatting error)";
- }
- }
-
- DBG("Consumer trace chunk exists command: relayd_id = %s"
- ", chunk_id = %" PRIu64, relayd_id_str,
- chunk_id);
- ret = lttng_trace_chunk_registry_chunk_exists(
- the_consumer_data.chunk_registry, session_id, chunk_id,
- &chunk_exists_local);
- if (ret) {
- /* Internal error. */
- ERR("Failed to query the existence of a trace chunk");
- ret_code = LTTCOMM_CONSUMERD_FATAL;
- goto end;
- }
- DBG("Trace chunk %s locally",
- chunk_exists_local ? "exists" : "does not exist");
- if (chunk_exists_local) {
- ret_code = LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_LOCAL;
- goto end;
- } else if (is_local_trace) {
- ret_code = LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK;
- goto end;
- }
-
- rcu_read_lock();
- relayd = consumer_find_relayd(*relayd_id);
- if (!relayd) {
- ERR("Failed to find relayd %" PRIu64, *relayd_id);
- ret_code = LTTCOMM_CONSUMERD_INVALID_PARAMETERS;
- goto end_rcu_unlock;
- }
- DBG("Looking up existence of trace chunk on relay daemon");
- pthread_mutex_lock(&relayd->ctrl_sock_mutex);
- ret = relayd_trace_chunk_exists(&relayd->control_sock, chunk_id,
- &chunk_exists_remote);
- pthread_mutex_unlock(&relayd->ctrl_sock_mutex);
- if (ret < 0) {
- ERR("Failed to look-up the existence of trace chunk on relay daemon");
- ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL;
- goto end_rcu_unlock;
- }
-
- ret_code = chunk_exists_remote ?
- LTTCOMM_CONSUMERD_TRACE_CHUNK_EXISTS_REMOTE :
- LTTCOMM_CONSUMERD_UNKNOWN_TRACE_CHUNK;
- DBG("Trace chunk %s on relay daemon",
- chunk_exists_remote ? "exists" : "does not exist");
-
-end_rcu_unlock:
- rcu_read_unlock();
-end:
- return ret_code;
-}
-
-static
-int consumer_clear_monitored_channel(struct lttng_consumer_channel *channel)
-{
- struct lttng_ht *ht;
- struct lttng_consumer_stream *stream;
- struct lttng_ht_iter iter;
- int ret;
-
- ht = the_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;
- }
- ret = consumer_clear_stream(stream);
- if (ret) {
- goto error_unlock;
- }
- next:
- pthread_mutex_unlock(&stream->lock);
- }
- rcu_read_unlock();
- return LTTCOMM_CONSUMERD_SUCCESS;
-
-error_unlock:
- pthread_mutex_unlock(&stream->lock);
- rcu_read_unlock();
- return ret;
-}
-
-int lttng_consumer_clear_channel(struct lttng_consumer_channel *channel)
-{
- int ret;
-
- DBG("Consumer clear channel %" PRIu64, channel->key);
-
- if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) {
- /*
- * Nothing to do for the metadata channel/stream.
- * Snapshot mechanism already take care of the metadata
- * handling/generation, and monitored channels only need to
- * have their data stream cleared..
- */
- ret = LTTCOMM_CONSUMERD_SUCCESS;
- goto end;
- }
-
- if (!channel->monitor) {
- ret = consumer_clear_unmonitored_channel(channel);
- } else {
- ret = consumer_clear_monitored_channel(channel);
- }
-end:
- return ret;
-}
-
-enum lttcomm_return_code lttng_consumer_open_channel_packets(
- struct lttng_consumer_channel *channel)
-{
- struct lttng_consumer_stream *stream;
- enum lttcomm_return_code ret = LTTCOMM_CONSUMERD_SUCCESS;
-
- if (channel->metadata_stream) {
- ERR("Open channel packets command attempted on a metadata channel");
- ret = LTTCOMM_CONSUMERD_INVALID_PARAMETERS;
- goto end;
- }
-
- rcu_read_lock();
- cds_list_for_each_entry(stream, &channel->streams.head, send_node) {
- enum consumer_stream_open_packet_status status;
-
- pthread_mutex_lock(&stream->lock);
- if (cds_lfht_is_node_deleted(&stream->node.node)) {
- goto next;
- }
-
- status = consumer_stream_open_packet(stream);
- switch (status) {
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_OPENED:
- DBG("Opened a packet in \"open channel packets\" command: stream id = %" PRIu64
- ", channel name = %s, session id = %" PRIu64,
- stream->key, stream->chan->name,
- stream->chan->session_id);
- stream->opened_packet_in_current_trace_chunk = true;
- break;
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_NO_SPACE:
- DBG("No space left to open a packet in \"open channel packets\" command: stream id = %" PRIu64
- ", channel name = %s, session id = %" PRIu64,
- stream->key, stream->chan->name,
- stream->chan->session_id);
- break;
- case CONSUMER_STREAM_OPEN_PACKET_STATUS_ERROR:
- /*
- * Only unexpected internal errors can lead to this
- * failing. Report an unknown error.
- */
- ERR("Failed to flush empty buffer in \"open channel packets\" command: stream id = %" PRIu64
- ", channel id = %" PRIu64
- ", channel name = %s"
- ", session id = %" PRIu64,
- stream->key, channel->key,
- channel->name, channel->session_id);
- ret = LTTCOMM_CONSUMERD_UNKNOWN_ERROR;
- goto error_unlock;
- default:
- abort();
- }
-
- next:
- pthread_mutex_unlock(&stream->lock);
- }
-
-end_rcu_unlock:
- rcu_read_unlock();
-end:
- return ret;
-
-error_unlock:
- pthread_mutex_unlock(&stream->lock);
- goto end_rcu_unlock;
-}
-
-void lttng_consumer_sigbus_handle(void *addr)
-{
- lttng_ustconsumer_sigbus_handle(addr);
-}
projects / lttng-tools.git / blobdiff