X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-sessiond%2Fust-app.c;h=b18988560f7f8e1a5906b228732beb515fcf54bc;hp=d303e8b66ec240f590cda13b621dc0a6918cecf4;hb=HEAD;hpb=acfb63a8ba86cb7d89cfeea515abceb89f2907e9 diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c deleted file mode 100644 index d303e8b66..000000000 --- a/src/bin/lttng-sessiond/ust-app.c +++ /dev/null @@ -1,7818 +0,0 @@ -/* - * Copyright (C) 2011 David Goulet - * Copyright (C) 2016 Jérémie Galarneau - * - * SPDX-License-Identifier: GPL-2.0-only - * - */ - -#define _LGPL_SOURCE -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "buffer-registry.h" -#include "condition-internal.h" -#include "fd-limit.h" -#include "health-sessiond.h" -#include "ust-app.h" -#include "ust-consumer.h" -#include "lttng-ust-ctl.h" -#include "lttng-ust-error.h" -#include "utils.h" -#include "session.h" -#include "lttng-sessiond.h" -#include "notification-thread-commands.h" -#include "rotate.h" -#include "event.h" -#include "event-notifier-error-accounting.h" - - -struct lttng_ht *ust_app_ht; -struct lttng_ht *ust_app_ht_by_sock; -struct lttng_ht *ust_app_ht_by_notify_sock; - -static -int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); - -/* Next available channel key. Access under next_channel_key_lock. */ -static uint64_t _next_channel_key; -static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; - -/* Next available session ID. Access under next_session_id_lock. */ -static uint64_t _next_session_id; -static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; - -/* - * Return the incremented value of next_channel_key. - */ -static uint64_t get_next_channel_key(void) -{ - uint64_t ret; - - pthread_mutex_lock(&next_channel_key_lock); - ret = ++_next_channel_key; - pthread_mutex_unlock(&next_channel_key_lock); - return ret; -} - -/* - * Return the atomically incremented value of next_session_id. - */ -static uint64_t get_next_session_id(void) -{ - uint64_t ret; - - pthread_mutex_lock(&next_session_id_lock); - ret = ++_next_session_id; - pthread_mutex_unlock(&next_session_id_lock); - return ret; -} - -static void copy_channel_attr_to_ustctl( - struct lttng_ust_ctl_consumer_channel_attr *attr, - struct lttng_ust_abi_channel_attr *uattr) -{ - /* Copy event attributes since the layout is different. */ - attr->subbuf_size = uattr->subbuf_size; - attr->num_subbuf = uattr->num_subbuf; - attr->overwrite = uattr->overwrite; - attr->switch_timer_interval = uattr->switch_timer_interval; - attr->read_timer_interval = uattr->read_timer_interval; - attr->output = uattr->output; - attr->blocking_timeout = uattr->u.s.blocking_timeout; -} - -/* - * Match function for the hash table lookup. - * - * It matches an ust app event based on three attributes which are the event - * name, the filter bytecode and the loglevel. - */ -static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) -{ - struct ust_app_event *event; - const struct ust_app_ht_key *key; - int ev_loglevel_value; - - LTTNG_ASSERT(node); - LTTNG_ASSERT(_key); - - event = caa_container_of(node, struct ust_app_event, node.node); - key = _key; - ev_loglevel_value = event->attr.loglevel; - - /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ - - /* Event name */ - if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { - goto no_match; - } - - /* Event loglevel. */ - if (ev_loglevel_value != key->loglevel_type) { - if (event->attr.loglevel_type == LTTNG_UST_ABI_LOGLEVEL_ALL - && key->loglevel_type == 0 && - ev_loglevel_value == -1) { - /* - * Match is accepted. This is because on event creation, the - * loglevel is set to -1 if the event loglevel type is ALL so 0 and - * -1 are accepted for this loglevel type since 0 is the one set by - * the API when receiving an enable event. - */ - } else { - goto no_match; - } - } - - /* One of the filters is NULL, fail. */ - if ((key->filter && !event->filter) || (!key->filter && event->filter)) { - goto no_match; - } - - if (key->filter && event->filter) { - /* Both filters exists, check length followed by the bytecode. */ - if (event->filter->len != key->filter->len || - memcmp(event->filter->data, key->filter->data, - event->filter->len) != 0) { - goto no_match; - } - } - - /* One of the exclusions is NULL, fail. */ - if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { - goto no_match; - } - - if (key->exclusion && event->exclusion) { - /* Both exclusions exists, check count followed by the names. */ - if (event->exclusion->count != key->exclusion->count || - memcmp(event->exclusion->names, key->exclusion->names, - event->exclusion->count * LTTNG_UST_ABI_SYM_NAME_LEN) != 0) { - goto no_match; - } - } - - - /* Match. */ - return 1; - -no_match: - return 0; -} - -/* - * Unique add of an ust app event in the given ht. This uses the custom - * ht_match_ust_app_event match function and the event name as hash. - */ -static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, - struct ust_app_event *event) -{ - struct cds_lfht_node *node_ptr; - struct ust_app_ht_key key; - struct lttng_ht *ht; - - LTTNG_ASSERT(ua_chan); - LTTNG_ASSERT(ua_chan->events); - LTTNG_ASSERT(event); - - ht = ua_chan->events; - key.name = event->attr.name; - key.filter = event->filter; - key.loglevel_type = event->attr.loglevel; - key.exclusion = event->exclusion; - - node_ptr = cds_lfht_add_unique(ht->ht, - ht->hash_fct(event->node.key, lttng_ht_seed), - ht_match_ust_app_event, &key, &event->node.node); - LTTNG_ASSERT(node_ptr == &event->node.node); -} - -/* - * Close the notify socket from the given RCU head object. This MUST be called - * through a call_rcu(). - */ -static void close_notify_sock_rcu(struct rcu_head *head) -{ - int ret; - struct ust_app_notify_sock_obj *obj = - caa_container_of(head, struct ust_app_notify_sock_obj, head); - - /* Must have a valid fd here. */ - LTTNG_ASSERT(obj->fd >= 0); - - ret = close(obj->fd); - if (ret) { - ERR("close notify sock %d RCU", obj->fd); - } - lttng_fd_put(LTTNG_FD_APPS, 1); - - free(obj); -} - -/* - * Return the session registry according to the buffer type of the given - * session. - * - * A registry per UID object MUST exists before calling this function or else - * it LTTNG_ASSERT() if not found. RCU read side lock must be acquired. - */ -static struct ust_registry_session *get_session_registry( - struct ust_app_session *ua_sess) -{ - struct ust_registry_session *registry = NULL; - - LTTNG_ASSERT(ua_sess); - - switch (ua_sess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - { - struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); - if (!reg_pid) { - goto error; - } - registry = reg_pid->registry->reg.ust; - break; - } - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( - ua_sess->tracing_id, ua_sess->bits_per_long, - lttng_credentials_get_uid(&ua_sess->real_credentials)); - if (!reg_uid) { - goto error; - } - registry = reg_uid->registry->reg.ust; - break; - } - default: - abort(); - }; - -error: - return registry; -} - -/* - * Delete ust context safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, - struct ust_app *app) -{ - int ret; - - LTTNG_ASSERT(ua_ctx); - - if (ua_ctx->obj) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_object(sock, ua_ctx->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app release ctx failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app release ctx failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app release ctx obj handle %d failed with ret %d: pid = %d, sock = %d", - ua_ctx->obj->handle, ret, - app->pid, app->sock); - } - } - free(ua_ctx->obj); - } - free(ua_ctx); -} - -/* - * Delete ust app event safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_event(int sock, struct ust_app_event *ua_event, - struct ust_app *app) -{ - int ret; - - LTTNG_ASSERT(ua_event); - - free(ua_event->filter); - if (ua_event->exclusion != NULL) - free(ua_event->exclusion); - if (ua_event->obj != NULL) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_object(sock, ua_event->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app release event failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app release event failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app release event obj failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - free(ua_event->obj); - } - free(ua_event); -} - -/* - * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called - * through a call_rcu(). - */ -static -void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head) -{ - struct ust_app_event_notifier_rule *obj = caa_container_of( - head, struct ust_app_event_notifier_rule, rcu_head); - - free(obj); -} - -/* - * Delete ust app event notifier rule safely. - */ -static void delete_ust_app_event_notifier_rule(int sock, - struct ust_app_event_notifier_rule *ua_event_notifier_rule, - struct ust_app *app) -{ - int ret; - - LTTNG_ASSERT(ua_event_notifier_rule); - - if (ua_event_notifier_rule->exclusion != NULL) { - free(ua_event_notifier_rule->exclusion); - } - - if (ua_event_notifier_rule->obj != NULL) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_object(sock, ua_event_notifier_rule->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app release event notifier failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app release event notifier failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app release event notifier failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - - free(ua_event_notifier_rule->obj); - } - - lttng_trigger_put(ua_event_notifier_rule->trigger); - call_rcu(&ua_event_notifier_rule->rcu_head, - free_ust_app_event_notifier_rule_rcu); -} - -/* - * Release ust data object of the given stream. - * - * Return 0 on success or else a negative value. - */ -static int release_ust_app_stream(int sock, struct ust_app_stream *stream, - struct ust_app *app) -{ - int ret = 0; - - LTTNG_ASSERT(stream); - - if (stream->obj) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_object(sock, stream->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app release stream failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app release stream failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app release stream obj failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - lttng_fd_put(LTTNG_FD_APPS, 2); - free(stream->obj); - } - - return ret; -} - -/* - * Delete ust app stream safely. RCU read lock must be held before calling - * this function. - */ -static -void delete_ust_app_stream(int sock, struct ust_app_stream *stream, - struct ust_app *app) -{ - LTTNG_ASSERT(stream); - - (void) release_ust_app_stream(sock, stream, app); - free(stream); -} - -/* - * We need to execute ht_destroy outside of RCU read-side critical - * section and outside of call_rcu thread, so we postpone its execution - * using ht_cleanup_push. It is simpler than to change the semantic of - * the many callers of delete_ust_app_session(). - */ -static -void delete_ust_app_channel_rcu(struct rcu_head *head) -{ - struct ust_app_channel *ua_chan = - caa_container_of(head, struct ust_app_channel, rcu_head); - - ht_cleanup_push(ua_chan->ctx); - ht_cleanup_push(ua_chan->events); - free(ua_chan); -} - -/* - * Extract the lost packet or discarded events counter when the channel is - * being deleted and store the value in the parent channel so we can - * access it from lttng list and at stop/destroy. - * - * The session list lock must be held by the caller. - */ -static -void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) -{ - uint64_t discarded = 0, lost = 0; - struct ltt_session *session; - struct ltt_ust_channel *uchan; - - if (ua_chan->attr.type != LTTNG_UST_ABI_CHAN_PER_CPU) { - return; - } - - rcu_read_lock(); - session = session_find_by_id(ua_chan->session->tracing_id); - if (!session || !session->ust_session) { - /* - * Not finding the session is not an error because there are - * multiple ways the channels can be torn down. - * - * 1) The session daemon can initiate the destruction of the - * ust app session after receiving a destroy command or - * during its shutdown/teardown. - * 2) The application, since we are in per-pid tracing, is - * unregistering and tearing down its ust app session. - * - * Both paths are protected by the session list lock which - * ensures that the accounting of lost packets and discarded - * events is done exactly once. The session is then unpublished - * from the session list, resulting in this condition. - */ - goto end; - } - - if (ua_chan->attr.overwrite) { - consumer_get_lost_packets(ua_chan->session->tracing_id, - ua_chan->key, session->ust_session->consumer, - &lost); - } else { - consumer_get_discarded_events(ua_chan->session->tracing_id, - ua_chan->key, session->ust_session->consumer, - &discarded); - } - uchan = trace_ust_find_channel_by_name( - session->ust_session->domain_global.channels, - ua_chan->name); - if (!uchan) { - ERR("Missing UST channel to store discarded counters"); - goto end; - } - - uchan->per_pid_closed_app_discarded += discarded; - uchan->per_pid_closed_app_lost += lost; - -end: - rcu_read_unlock(); - if (session) { - session_put(session); - } -} - -/* - * Delete ust app channel safely. RCU read lock must be held before calling - * this function. - * - * The session list lock must be held by the caller. - */ -static -void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, - struct ust_app *app) -{ - int ret; - struct lttng_ht_iter iter; - struct ust_app_event *ua_event; - struct ust_app_ctx *ua_ctx; - struct ust_app_stream *stream, *stmp; - struct ust_registry_session *registry; - - LTTNG_ASSERT(ua_chan); - - DBG3("UST app deleting channel %s", ua_chan->name); - - /* Wipe stream */ - cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { - cds_list_del(&stream->list); - delete_ust_app_stream(sock, stream, app); - } - - /* Wipe context */ - cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { - cds_list_del(&ua_ctx->list); - ret = lttng_ht_del(ua_chan->ctx, &iter); - LTTNG_ASSERT(!ret); - delete_ust_app_ctx(sock, ua_ctx, app); - } - - /* Wipe events */ - cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, - node.node) { - ret = lttng_ht_del(ua_chan->events, &iter); - LTTNG_ASSERT(!ret); - delete_ust_app_event(sock, ua_event, app); - } - - if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { - /* Wipe and free registry from session registry. */ - registry = get_session_registry(ua_chan->session); - if (registry) { - ust_registry_channel_del_free(registry, ua_chan->key, - sock >= 0); - } - /* - * A negative socket can be used by the caller when - * cleaning-up a ua_chan in an error path. Skip the - * accounting in this case. - */ - if (sock >= 0) { - save_per_pid_lost_discarded_counters(ua_chan); - } - } - - if (ua_chan->obj != NULL) { - /* Remove channel from application UST object descriptor. */ - iter.iter.node = &ua_chan->ust_objd_node.node; - ret = lttng_ht_del(app->ust_objd, &iter); - LTTNG_ASSERT(!ret); - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_object(sock, ua_chan->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app channel %s release failed. Application is dead: pid = %d, sock = %d", - ua_chan->name, app->pid, - app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app channel %s release failed. Communication time out: pid = %d, sock = %d", - ua_chan->name, app->pid, - app->sock); - } else { - ERR("UST app channel %s release failed with ret %d: pid = %d, sock = %d", - ua_chan->name, ret, app->pid, - app->sock); - } - } - lttng_fd_put(LTTNG_FD_APPS, 1); - free(ua_chan->obj); - } - call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); -} - -int ust_app_register_done(struct ust_app *app) -{ - int ret; - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_register_done(app->sock); - pthread_mutex_unlock(&app->sock_lock); - return ret; -} - -int ust_app_release_object(struct ust_app *app, struct lttng_ust_abi_object_data *data) -{ - int ret, sock; - - if (app) { - pthread_mutex_lock(&app->sock_lock); - sock = app->sock; - } else { - sock = -1; - } - ret = lttng_ust_ctl_release_object(sock, data); - if (app) { - pthread_mutex_unlock(&app->sock_lock); - } - return ret; -} - -/* - * Push metadata to consumer socket. - * - * RCU read-side lock must be held to guarantee existance of socket. - * Must be called with the ust app session lock held. - * Must be called with the registry lock held. - * - * On success, return the len of metadata pushed or else a negative value. - * Returning a -EPIPE return value means we could not send the metadata, - * but it can be caused by recoverable errors (e.g. the application has - * terminated concurrently). - */ -ssize_t ust_app_push_metadata(struct ust_registry_session *registry, - struct consumer_socket *socket, int send_zero_data) -{ - int ret; - char *metadata_str = NULL; - size_t len, offset, new_metadata_len_sent; - ssize_t ret_val; - uint64_t metadata_key, metadata_version; - - LTTNG_ASSERT(registry); - LTTNG_ASSERT(socket); - - metadata_key = registry->metadata_key; - - /* - * Means that no metadata was assigned to the session. This can - * happens if no start has been done previously. - */ - if (!metadata_key) { - return 0; - } - - offset = registry->metadata_len_sent; - len = registry->metadata_len - registry->metadata_len_sent; - new_metadata_len_sent = registry->metadata_len; - metadata_version = registry->metadata_version; - if (len == 0) { - DBG3("No metadata to push for metadata key %" PRIu64, - registry->metadata_key); - ret_val = len; - if (send_zero_data) { - DBG("No metadata to push"); - goto push_data; - } - goto end; - } - - /* Allocate only what we have to send. */ - metadata_str = zmalloc(len); - if (!metadata_str) { - PERROR("zmalloc ust app metadata string"); - ret_val = -ENOMEM; - goto error; - } - /* Copy what we haven't sent out. */ - memcpy(metadata_str, registry->metadata + offset, len); - -push_data: - pthread_mutex_unlock(®istry->lock); - /* - * We need to unlock the registry while we push metadata to - * break a circular dependency between the consumerd metadata - * lock and the sessiond registry lock. Indeed, pushing metadata - * to the consumerd awaits that it gets pushed all the way to - * relayd, but doing so requires grabbing the metadata lock. If - * a concurrent metadata request is being performed by - * consumerd, this can try to grab the registry lock on the - * sessiond while holding the metadata lock on the consumer - * daemon. Those push and pull schemes are performed on two - * different bidirectionnal communication sockets. - */ - ret = consumer_push_metadata(socket, metadata_key, - metadata_str, len, offset, metadata_version); - pthread_mutex_lock(®istry->lock); - if (ret < 0) { - /* - * There is an acceptable race here between the registry - * metadata key assignment and the creation on the - * consumer. The session daemon can concurrently push - * metadata for this registry while being created on the - * consumer since the metadata key of the registry is - * assigned *before* it is setup to avoid the consumer - * to ask for metadata that could possibly be not found - * in the session daemon. - * - * The metadata will get pushed either by the session - * being stopped or the consumer requesting metadata if - * that race is triggered. - */ - if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { - ret = 0; - } else { - ERR("Error pushing metadata to consumer"); - } - ret_val = ret; - goto error_push; - } else { - /* - * Metadata may have been concurrently pushed, since - * we're not holding the registry lock while pushing to - * consumer. This is handled by the fact that we send - * the metadata content, size, and the offset at which - * that metadata belongs. This may arrive out of order - * on the consumer side, and the consumer is able to - * deal with overlapping fragments. The consumer - * supports overlapping fragments, which must be - * contiguous starting from offset 0. We keep the - * largest metadata_len_sent value of the concurrent - * send. - */ - registry->metadata_len_sent = - max_t(size_t, registry->metadata_len_sent, - new_metadata_len_sent); - } - free(metadata_str); - return len; - -end: -error: - if (ret_val) { - /* - * On error, flag the registry that the metadata is - * closed. We were unable to push anything and this - * means that either the consumer is not responding or - * the metadata cache has been destroyed on the - * consumer. - */ - registry->metadata_closed = 1; - } -error_push: - free(metadata_str); - return ret_val; -} - -/* - * For a given application and session, push metadata to consumer. - * Either sock or consumer is required : if sock is NULL, the default - * socket to send the metadata is retrieved from consumer, if sock - * is not NULL we use it to send the metadata. - * RCU read-side lock must be held while calling this function, - * therefore ensuring existance of registry. It also ensures existance - * of socket throughout this function. - * - * Return 0 on success else a negative error. - * Returning a -EPIPE return value means we could not send the metadata, - * but it can be caused by recoverable errors (e.g. the application has - * terminated concurrently). - */ -static int push_metadata(struct ust_registry_session *registry, - struct consumer_output *consumer) -{ - int ret_val; - ssize_t ret; - struct consumer_socket *socket; - - LTTNG_ASSERT(registry); - LTTNG_ASSERT(consumer); - - pthread_mutex_lock(®istry->lock); - if (registry->metadata_closed) { - ret_val = -EPIPE; - goto error; - } - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(registry->bits_per_long, - consumer); - if (!socket) { - ret_val = -1; - goto error; - } - - ret = ust_app_push_metadata(registry, socket, 0); - if (ret < 0) { - ret_val = ret; - goto error; - } - pthread_mutex_unlock(®istry->lock); - return 0; - -error: - pthread_mutex_unlock(®istry->lock); - return ret_val; -} - -/* - * Send to the consumer a close metadata command for the given session. Once - * done, the metadata channel is deleted and the session metadata pointer is - * nullified. The session lock MUST be held unless the application is - * in the destroy path. - * - * Do not hold the registry lock while communicating with the consumerd, because - * doing so causes inter-process deadlocks between consumerd and sessiond with - * the metadata request notification. - * - * Return 0 on success else a negative value. - */ -static int close_metadata(struct ust_registry_session *registry, - struct consumer_output *consumer) -{ - int ret; - struct consumer_socket *socket; - uint64_t metadata_key; - bool registry_was_already_closed; - - LTTNG_ASSERT(registry); - LTTNG_ASSERT(consumer); - - rcu_read_lock(); - - pthread_mutex_lock(®istry->lock); - metadata_key = registry->metadata_key; - registry_was_already_closed = registry->metadata_closed; - if (metadata_key != 0) { - /* - * Metadata closed. Even on error this means that the consumer - * is not responding or not found so either way a second close - * should NOT be emit for this registry. - */ - registry->metadata_closed = 1; - } - pthread_mutex_unlock(®istry->lock); - - if (metadata_key == 0 || registry_was_already_closed) { - ret = 0; - goto end; - } - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(registry->bits_per_long, - consumer); - if (!socket) { - ret = -1; - goto end; - } - - ret = consumer_close_metadata(socket, metadata_key); - if (ret < 0) { - goto end; - } - -end: - rcu_read_unlock(); - return ret; -} - -/* - * We need to execute ht_destroy outside of RCU read-side critical - * section and outside of call_rcu thread, so we postpone its execution - * using ht_cleanup_push. It is simpler than to change the semantic of - * the many callers of delete_ust_app_session(). - */ -static -void delete_ust_app_session_rcu(struct rcu_head *head) -{ - struct ust_app_session *ua_sess = - caa_container_of(head, struct ust_app_session, rcu_head); - - ht_cleanup_push(ua_sess->channels); - free(ua_sess); -} - -/* - * Delete ust app session safely. RCU read lock must be held before calling - * this function. - * - * The session list lock must be held by the caller. - */ -static -void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, - struct ust_app *app) -{ - int ret; - struct lttng_ht_iter iter; - struct ust_app_channel *ua_chan; - struct ust_registry_session *registry; - - LTTNG_ASSERT(ua_sess); - - pthread_mutex_lock(&ua_sess->lock); - - LTTNG_ASSERT(!ua_sess->deleted); - ua_sess->deleted = true; - - registry = get_session_registry(ua_sess); - /* Registry can be null on error path during initialization. */ - if (registry) { - /* Push metadata for application before freeing the application. */ - (void) push_metadata(registry, ua_sess->consumer); - - /* - * Don't ask to close metadata for global per UID buffers. Close - * metadata only on destroy trace session in this case. Also, the - * previous push metadata could have flag the metadata registry to - * close so don't send a close command if closed. - */ - if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { - /* And ask to close it for this session registry. */ - (void) close_metadata(registry, ua_sess->consumer); - } - } - - cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, - node.node) { - ret = lttng_ht_del(ua_sess->channels, &iter); - LTTNG_ASSERT(!ret); - delete_ust_app_channel(sock, ua_chan, app); - } - - /* In case of per PID, the registry is kept in the session. */ - if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { - struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); - if (reg_pid) { - /* - * Registry can be null on error path during - * initialization. - */ - buffer_reg_pid_remove(reg_pid); - buffer_reg_pid_destroy(reg_pid); - } - } - - if (ua_sess->handle != -1) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_release_handle(sock, ua_sess->handle); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app release session handle failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app release session handle failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app release session handle failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - - /* Remove session from application UST object descriptor. */ - iter.iter.node = &ua_sess->ust_objd_node.node; - ret = lttng_ht_del(app->ust_sessions_objd, &iter); - LTTNG_ASSERT(!ret); - } - - pthread_mutex_unlock(&ua_sess->lock); - - consumer_output_put(ua_sess->consumer); - - call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); -} - -/* - * Delete a traceable application structure from the global list. Never call - * this function outside of a call_rcu call. - * - * RCU read side lock should _NOT_ be held when calling this function. - */ -static -void delete_ust_app(struct ust_app *app) -{ - int ret, sock; - struct ust_app_session *ua_sess, *tmp_ua_sess; - struct lttng_ht_iter iter; - struct ust_app_event_notifier_rule *event_notifier_rule; - bool event_notifier_write_fd_is_open; - - /* - * The session list lock must be held during this function to guarantee - * the existence of ua_sess. - */ - session_lock_list(); - /* Delete ust app sessions info */ - sock = app->sock; - app->sock = -1; - - /* Wipe sessions */ - cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, - teardown_node) { - /* Free every object in the session and the session. */ - rcu_read_lock(); - delete_ust_app_session(sock, ua_sess, app); - rcu_read_unlock(); - } - - /* Remove the event notifier rules associated with this app. */ - rcu_read_lock(); - cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, - &iter.iter, event_notifier_rule, node.node) { - ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter); - LTTNG_ASSERT(!ret); - - delete_ust_app_event_notifier_rule( - app->sock, event_notifier_rule, app); - } - - rcu_read_unlock(); - - ht_cleanup_push(app->sessions); - ht_cleanup_push(app->ust_sessions_objd); - ht_cleanup_push(app->ust_objd); - ht_cleanup_push(app->token_to_event_notifier_rule_ht); - - /* - * This could be NULL if the event notifier setup failed (e.g the app - * was killed or the tracer does not support this feature). - */ - if (app->event_notifier_group.object) { - enum lttng_error_code ret_code; - enum event_notifier_error_accounting_status status; - - const int event_notifier_read_fd = lttng_pipe_get_readfd( - app->event_notifier_group.event_pipe); - - ret_code = notification_thread_command_remove_tracer_event_source( - the_notification_thread_handle, - event_notifier_read_fd); - if (ret_code != LTTNG_OK) { - ERR("Failed to remove application tracer event source from notification thread"); - } - - status = event_notifier_error_accounting_unregister_app(app); - if (status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { - ERR("Error unregistering app from event notifier error accounting"); - } - - lttng_ust_ctl_release_object(sock, app->event_notifier_group.object); - free(app->event_notifier_group.object); - } - - event_notifier_write_fd_is_open = lttng_pipe_is_write_open( - app->event_notifier_group.event_pipe); - lttng_pipe_destroy(app->event_notifier_group.event_pipe); - /* - * Release the file descriptors reserved for the event notifier pipe. - * The app could be destroyed before the write end of the pipe could be - * passed to the application (and closed). In that case, both file - * descriptors must be released. - */ - lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1); - - /* - * Wait until we have deleted the application from the sock hash table - * before closing this socket, otherwise an application could re-use the - * socket ID and race with the teardown, using the same hash table entry. - * - * It's OK to leave the close in call_rcu. We want it to stay unique for - * all RCU readers that could run concurrently with unregister app, - * therefore we _need_ to only close that socket after a grace period. So - * it should stay in this RCU callback. - * - * This close() is a very important step of the synchronization model so - * every modification to this function must be carefully reviewed. - */ - ret = close(sock); - if (ret) { - PERROR("close"); - } - lttng_fd_put(LTTNG_FD_APPS, 1); - - DBG2("UST app pid %d deleted", app->pid); - free(app); - session_unlock_list(); -} - -/* - * URCU intermediate call to delete an UST app. - */ -static -void delete_ust_app_rcu(struct rcu_head *head) -{ - struct lttng_ht_node_ulong *node = - caa_container_of(head, struct lttng_ht_node_ulong, head); - struct ust_app *app = - caa_container_of(node, struct ust_app, pid_n); - - DBG3("Call RCU deleting app PID %d", app->pid); - delete_ust_app(app); -} - -/* - * Delete the session from the application ht and delete the data structure by - * freeing every object inside and releasing them. - * - * The session list lock must be held by the caller. - */ -static void destroy_app_session(struct ust_app *app, - struct ust_app_session *ua_sess) -{ - int ret; - struct lttng_ht_iter iter; - - LTTNG_ASSERT(app); - LTTNG_ASSERT(ua_sess); - - iter.iter.node = &ua_sess->node.node; - ret = lttng_ht_del(app->sessions, &iter); - if (ret) { - /* Already scheduled for teardown. */ - goto end; - } - - /* Once deleted, free the data structure. */ - delete_ust_app_session(app->sock, ua_sess, app); - -end: - return; -} - -/* - * Alloc new UST app session. - */ -static -struct ust_app_session *alloc_ust_app_session(void) -{ - struct ust_app_session *ua_sess; - - /* Init most of the default value by allocating and zeroing */ - ua_sess = zmalloc(sizeof(struct ust_app_session)); - if (ua_sess == NULL) { - PERROR("malloc"); - goto error_free; - } - - ua_sess->handle = -1; - ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - ua_sess->metadata_attr.type = LTTNG_UST_ABI_CHAN_METADATA; - pthread_mutex_init(&ua_sess->lock, NULL); - - return ua_sess; - -error_free: - return NULL; -} - -/* - * Alloc new UST app channel. - */ -static -struct ust_app_channel *alloc_ust_app_channel(const char *name, - struct ust_app_session *ua_sess, - struct lttng_ust_abi_channel_attr *attr) -{ - struct ust_app_channel *ua_chan; - - /* Init most of the default value by allocating and zeroing */ - ua_chan = zmalloc(sizeof(struct ust_app_channel)); - if (ua_chan == NULL) { - PERROR("malloc"); - goto error; - } - - /* Setup channel name */ - strncpy(ua_chan->name, name, sizeof(ua_chan->name)); - ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; - - ua_chan->enabled = 1; - ua_chan->handle = -1; - ua_chan->session = ua_sess; - ua_chan->key = get_next_channel_key(); - ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); - lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); - - CDS_INIT_LIST_HEAD(&ua_chan->streams.head); - CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); - - /* Copy attributes */ - if (attr) { - /* Translate from lttng_ust_channel to lttng_ust_ctl_consumer_channel_attr. */ - ua_chan->attr.subbuf_size = attr->subbuf_size; - ua_chan->attr.num_subbuf = attr->num_subbuf; - ua_chan->attr.overwrite = attr->overwrite; - ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; - ua_chan->attr.read_timer_interval = attr->read_timer_interval; - ua_chan->attr.output = attr->output; - ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; - } - /* By default, the channel is a per cpu channel. */ - ua_chan->attr.type = LTTNG_UST_ABI_CHAN_PER_CPU; - - DBG3("UST app channel %s allocated", ua_chan->name); - - return ua_chan; - -error: - return NULL; -} - -/* - * Allocate and initialize a UST app stream. - * - * Return newly allocated stream pointer or NULL on error. - */ -struct ust_app_stream *ust_app_alloc_stream(void) -{ - struct ust_app_stream *stream = NULL; - - stream = zmalloc(sizeof(*stream)); - if (stream == NULL) { - PERROR("zmalloc ust app stream"); - goto error; - } - - /* Zero could be a valid value for a handle so flag it to -1. */ - stream->handle = -1; - -error: - return stream; -} - -/* - * Alloc new UST app event. - */ -static -struct ust_app_event *alloc_ust_app_event(char *name, - struct lttng_ust_abi_event *attr) -{ - struct ust_app_event *ua_event; - - /* Init most of the default value by allocating and zeroing */ - ua_event = zmalloc(sizeof(struct ust_app_event)); - if (ua_event == NULL) { - PERROR("Failed to allocate ust_app_event structure"); - goto error; - } - - ua_event->enabled = 1; - strncpy(ua_event->name, name, sizeof(ua_event->name)); - ua_event->name[sizeof(ua_event->name) - 1] = '\0'; - lttng_ht_node_init_str(&ua_event->node, ua_event->name); - - /* Copy attributes */ - if (attr) { - memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); - } - - DBG3("UST app event %s allocated", ua_event->name); - - return ua_event; - -error: - return NULL; -} - -/* - * Allocate a new UST app event notifier rule. - */ -static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule( - struct lttng_trigger *trigger) -{ - enum lttng_event_rule_generate_exclusions_status - generate_exclusion_status; - enum lttng_condition_status cond_status; - struct ust_app_event_notifier_rule *ua_event_notifier_rule; - struct lttng_condition *condition = NULL; - const struct lttng_event_rule *event_rule = NULL; - - ua_event_notifier_rule = zmalloc(sizeof(struct ust_app_event_notifier_rule)); - if (ua_event_notifier_rule == NULL) { - PERROR("Failed to allocate ust_app_event_notifier_rule structure"); - goto error; - } - - ua_event_notifier_rule->enabled = 1; - ua_event_notifier_rule->token = lttng_trigger_get_tracer_token(trigger); - lttng_ht_node_init_u64(&ua_event_notifier_rule->node, - ua_event_notifier_rule->token); - - condition = lttng_trigger_get_condition(trigger); - LTTNG_ASSERT(condition); - LTTNG_ASSERT(lttng_condition_get_type(condition) == - LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); - - cond_status = lttng_condition_event_rule_matches_get_rule( - condition, &event_rule); - LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); - LTTNG_ASSERT(event_rule); - - ua_event_notifier_rule->error_counter_index = - lttng_condition_event_rule_matches_get_error_counter_index(condition); - /* Acquire the event notifier's reference to the trigger. */ - lttng_trigger_get(trigger); - - ua_event_notifier_rule->trigger = trigger; - ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule); - generate_exclusion_status = lttng_event_rule_generate_exclusions( - event_rule, &ua_event_notifier_rule->exclusion); - switch (generate_exclusion_status) { - case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK: - case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE: - break; - default: - /* Error occurred. */ - ERR("Failed to generate exclusions from trigger while allocating an event notifier rule"); - goto error_put_trigger; - } - - DBG3("UST app event notifier rule allocated: token = %" PRIu64, - ua_event_notifier_rule->token); - - return ua_event_notifier_rule; - -error_put_trigger: - lttng_trigger_put(trigger); -error: - free(ua_event_notifier_rule); - return NULL; -} - -/* - * Alloc new UST app context. - */ -static -struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) -{ - struct ust_app_ctx *ua_ctx; - - ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); - if (ua_ctx == NULL) { - goto error; - } - - CDS_INIT_LIST_HEAD(&ua_ctx->list); - - if (uctx) { - memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); - if (uctx->ctx == LTTNG_UST_ABI_CONTEXT_APP_CONTEXT) { - char *provider_name = NULL, *ctx_name = NULL; - - provider_name = strdup(uctx->u.app_ctx.provider_name); - ctx_name = strdup(uctx->u.app_ctx.ctx_name); - if (!provider_name || !ctx_name) { - free(provider_name); - free(ctx_name); - goto error; - } - - ua_ctx->ctx.u.app_ctx.provider_name = provider_name; - ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; - } - } - - DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); - return ua_ctx; -error: - free(ua_ctx); - return NULL; -} - -/* - * Create a liblttng-ust filter bytecode from given bytecode. - * - * Return allocated filter or NULL on error. - */ -static struct lttng_ust_abi_filter_bytecode *create_ust_filter_bytecode_from_bytecode( - const struct lttng_bytecode *orig_f) -{ - struct lttng_ust_abi_filter_bytecode *filter = NULL; - - /* Copy filter bytecode. */ - filter = zmalloc(sizeof(*filter) + orig_f->len); - if (!filter) { - PERROR("Failed to allocate lttng_ust_filter_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); - goto error; - } - - LTTNG_ASSERT(sizeof(struct lttng_bytecode) == - sizeof(struct lttng_ust_abi_filter_bytecode)); - memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); -error: - return filter; -} - -/* - * Create a liblttng-ust capture bytecode from given bytecode. - * - * Return allocated filter or NULL on error. - */ -static struct lttng_ust_abi_capture_bytecode * -create_ust_capture_bytecode_from_bytecode(const struct lttng_bytecode *orig_f) -{ - struct lttng_ust_abi_capture_bytecode *capture = NULL; - - /* Copy capture bytecode. */ - capture = zmalloc(sizeof(*capture) + orig_f->len); - if (!capture) { - PERROR("Failed to allocate lttng_ust_abi_capture_bytecode: bytecode len = %" PRIu32 " bytes", orig_f->len); - goto error; - } - - LTTNG_ASSERT(sizeof(struct lttng_bytecode) == - sizeof(struct lttng_ust_abi_capture_bytecode)); - memcpy(capture, orig_f, sizeof(*capture) + orig_f->len); -error: - return capture; -} - -/* - * Find an ust_app using the sock and return it. RCU read side lock must be - * held before calling this helper function. - */ -struct ust_app *ust_app_find_by_sock(int sock) -{ - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - - lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app find by sock %d not found", sock); - goto error; - } - - return caa_container_of(node, struct ust_app, sock_n); - -error: - return NULL; -} - -/* - * Find an ust_app using the notify sock and return it. RCU read side lock must - * be held before calling this helper function. - */ -static struct ust_app *find_app_by_notify_sock(int sock) -{ - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - - lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), - &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app find by notify sock %d not found", sock); - goto error; - } - - return caa_container_of(node, struct ust_app, notify_sock_n); - -error: - return NULL; -} - -/* - * Lookup for an ust app event based on event name, filter bytecode and the - * event loglevel. - * - * Return an ust_app_event object or NULL on error. - */ -static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, - const char *name, const struct lttng_bytecode *filter, - int loglevel_value, - const struct lttng_event_exclusion *exclusion) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_str *node; - struct ust_app_event *event = NULL; - struct ust_app_ht_key key; - - LTTNG_ASSERT(name); - LTTNG_ASSERT(ht); - - /* Setup key for event lookup. */ - key.name = name; - key.filter = filter; - key.loglevel_type = loglevel_value; - /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ - key.exclusion = exclusion; - - /* Lookup using the event name as hash and a custom match fct. */ - cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), - ht_match_ust_app_event, &key, &iter.iter); - node = lttng_ht_iter_get_node_str(&iter); - if (node == NULL) { - goto end; - } - - event = caa_container_of(node, struct ust_app_event, node); - -end: - return event; -} - -/* - * Look-up an event notifier rule based on its token id. - * - * Must be called with the RCU read lock held. - * Return an ust_app_event_notifier_rule object or NULL on error. - */ -static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule( - struct lttng_ht *ht, uint64_t token) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - struct ust_app_event_notifier_rule *event_notifier_rule = NULL; - - LTTNG_ASSERT(ht); - - lttng_ht_lookup(ht, &token, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node == NULL) { - DBG2("UST app event notifier rule token not found: token = %" PRIu64, - token); - goto end; - } - - event_notifier_rule = caa_container_of( - node, struct ust_app_event_notifier_rule, node); -end: - return event_notifier_rule; -} - -/* - * Create the channel context on the tracer. - * - * Called with UST app session lock held. - */ -static -int create_ust_channel_context(struct ust_app_channel *ua_chan, - struct ust_app_ctx *ua_ctx, struct ust_app *app) -{ - int ret; - - health_code_update(); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_add_context(app->sock, &ua_ctx->ctx, - ua_chan->obj, &ua_ctx->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app create channel context failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app create channel context failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app create channel context failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - goto error; - } - - ua_ctx->handle = ua_ctx->obj->handle; - - DBG2("UST app context handle %d created successfully for channel %s", - ua_ctx->handle, ua_chan->name); - -error: - health_code_update(); - return ret; -} - -/* - * Set the filter on the tracer. - */ -static int set_ust_object_filter(struct ust_app *app, - const struct lttng_bytecode *bytecode, - struct lttng_ust_abi_object_data *ust_object) -{ - int ret; - struct lttng_ust_abi_filter_bytecode *ust_bytecode = NULL; - - health_code_update(); - - ust_bytecode = create_ust_filter_bytecode_from_bytecode(bytecode); - if (!ust_bytecode) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_set_filter(app->sock, ust_bytecode, - ust_object); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app set filter failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app set filter failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app set filter failed with ret %d: pid = %d, sock = %d, object = %p", - ret, app->pid, app->sock, ust_object); - } - goto error; - } - - DBG2("UST filter successfully set: object = %p", ust_object); - -error: - health_code_update(); - free(ust_bytecode); - return ret; -} - -/* - * Set a capture bytecode for the passed object. - * The sequence number enforces the ordering at runtime and on reception of - * the captured payloads. - */ -static int set_ust_capture(struct ust_app *app, - const struct lttng_bytecode *bytecode, - unsigned int capture_seqnum, - struct lttng_ust_abi_object_data *ust_object) -{ - int ret; - struct lttng_ust_abi_capture_bytecode *ust_bytecode = NULL; - - health_code_update(); - - ust_bytecode = create_ust_capture_bytecode_from_bytecode(bytecode); - if (!ust_bytecode) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - - /* - * Set the sequence number to ensure the capture of fields is ordered. - */ - ust_bytecode->seqnum = capture_seqnum; - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_set_capture(app->sock, ust_bytecode, - ust_object); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app set capture failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - DBG3("UST app set capture failed. Communication timeout: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app event set capture failed with ret %d: pid = %d, sock = %d", - ret, app->pid, - app->sock); - } - - goto error; - } - - DBG2("UST capture successfully set: object = %p", ust_object); - -error: - health_code_update(); - free(ust_bytecode); - return ret; -} - -static -struct lttng_ust_abi_event_exclusion *create_ust_exclusion_from_exclusion( - const struct lttng_event_exclusion *exclusion) -{ - struct lttng_ust_abi_event_exclusion *ust_exclusion = NULL; - size_t exclusion_alloc_size = sizeof(struct lttng_ust_abi_event_exclusion) + - LTTNG_UST_ABI_SYM_NAME_LEN * exclusion->count; - - ust_exclusion = zmalloc(exclusion_alloc_size); - if (!ust_exclusion) { - PERROR("malloc"); - goto end; - } - - LTTNG_ASSERT(sizeof(struct lttng_event_exclusion) == - sizeof(struct lttng_ust_abi_event_exclusion)); - memcpy(ust_exclusion, exclusion, exclusion_alloc_size); -end: - return ust_exclusion; -} - -/* - * Set event exclusions on the tracer. - */ -static int set_ust_object_exclusions(struct ust_app *app, - const struct lttng_event_exclusion *exclusions, - struct lttng_ust_abi_object_data *ust_object) -{ - int ret; - struct lttng_ust_abi_event_exclusion *ust_exclusions = NULL; - - LTTNG_ASSERT(exclusions && exclusions->count > 0); - - health_code_update(); - - ust_exclusions = create_ust_exclusion_from_exclusion( - exclusions); - if (!ust_exclusions) { - ret = -LTTNG_ERR_NOMEM; - goto error; - } - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_set_exclusion(app->sock, ust_exclusions, ust_object); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app event exclusion failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app event exclusion failed. Communication time out(pid: %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app event exclusions failed with ret %d: pid = %d, sock = %d, object = %p", - ret, app->pid, app->sock, ust_object); - } - goto error; - } - - DBG2("UST exclusions set successfully for object %p", ust_object); - -error: - health_code_update(); - free(ust_exclusions); - return ret; -} - -/* - * Disable the specified event on to UST tracer for the UST session. - */ -static int disable_ust_object(struct ust_app *app, - struct lttng_ust_abi_object_data *object) -{ - int ret; - - health_code_update(); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_disable(app->sock, object); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app disable object failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app disable object failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app disable object failed with ret %d: pid = %d, sock = %d, object = %p", - ret, app->pid, app->sock, object); - } - goto error; - } - - DBG2("UST app object %p disabled successfully for app: pid = %d", - object, app->pid); - -error: - health_code_update(); - return ret; -} - -/* - * Disable the specified channel on to UST tracer for the UST session. - */ -static int disable_ust_channel(struct ust_app *app, - struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) -{ - int ret; - - health_code_update(); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_disable(app->sock, ua_chan->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app disable channel failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app disable channel failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app channel %s disable failed, session handle %d, with ret %d: pid = %d, sock = %d", - ua_chan->name, ua_sess->handle, ret, - app->pid, app->sock); - } - goto error; - } - - DBG2("UST app channel %s disabled successfully for app: pid = %d", - ua_chan->name, app->pid); - -error: - health_code_update(); - return ret; -} - -/* - * Enable the specified channel on to UST tracer for the UST session. - */ -static int enable_ust_channel(struct ust_app *app, - struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) -{ - int ret; - - health_code_update(); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_enable(app->sock, ua_chan->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app channel %s enable failed. Application is dead: pid = %d, sock = %d", - ua_chan->name, app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app channel %s enable failed. Communication time out: pid = %d, sock = %d", - ua_chan->name, app->pid, app->sock); - } else { - ERR("UST app channel %s enable failed, session handle %d, with ret %d: pid = %d, sock = %d", - ua_chan->name, ua_sess->handle, ret, - app->pid, app->sock); - } - goto error; - } - - ua_chan->enabled = 1; - - DBG2("UST app channel %s enabled successfully for app: pid = %d", - ua_chan->name, app->pid); - -error: - health_code_update(); - return ret; -} - -/* - * Enable the specified event on to UST tracer for the UST session. - */ -static int enable_ust_object( - struct ust_app *app, struct lttng_ust_abi_object_data *ust_object) -{ - int ret; - - health_code_update(); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_enable(app->sock, ust_object); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app enable object failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app enable object failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app enable object failed with ret %d: pid = %d, sock = %d, object = %p", - ret, app->pid, app->sock, ust_object); - } - goto error; - } - - DBG2("UST app object %p enabled successfully for app: pid = %d", - ust_object, app->pid); - -error: - health_code_update(); - return ret; -} - -/* - * Send channel and stream buffer to application. - * - * Return 0 on success. On error, a negative value is returned. - */ -static int send_channel_pid_to_ust(struct ust_app *app, - struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) -{ - int ret; - struct ust_app_stream *stream, *stmp; - - LTTNG_ASSERT(app); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - - health_code_update(); - - DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, - app->sock); - - /* Send channel to the application. */ - ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = -ENOTCONN; /* Caused by app exiting. */ - goto error; - } else if (ret == -EAGAIN) { - /* Caused by timeout. */ - WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", - app->pid, ua_chan->name, ua_sess->tracing_id); - /* Treat this the same way as an application that is exiting. */ - ret = -ENOTCONN; - goto error; - } else if (ret < 0) { - goto error; - } - - health_code_update(); - - /* Send all streams to application. */ - cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { - ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = -ENOTCONN; /* Caused by app exiting. */ - goto error; - } else if (ret == -EAGAIN) { - /* Caused by timeout. */ - WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".", - app->pid, stream->name, ua_chan->name, - ua_sess->tracing_id); - /* - * Treat this the same way as an application that is - * exiting. - */ - ret = -ENOTCONN; - } else if (ret < 0) { - goto error; - } - /* We don't need the stream anymore once sent to the tracer. */ - cds_list_del(&stream->list); - delete_ust_app_stream(-1, stream, app); - } - /* Flag the channel that it is sent to the application. */ - ua_chan->is_sent = 1; - -error: - health_code_update(); - return ret; -} - -/* - * Create the specified event onto the UST tracer for a UST session. - * - * Should be called with session mutex held. - */ -static -int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) -{ - int ret = 0; - - health_code_update(); - - /* Create UST event on tracer */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, - &ua_event->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app create event failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app create event failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app create event '%s' failed with ret %d: pid = %d, sock = %d", - ua_event->attr.name, ret, app->pid, - app->sock); - } - goto error; - } - - ua_event->handle = ua_event->obj->handle; - - DBG2("UST app event %s created successfully for pid:%d object = %p", - ua_event->attr.name, app->pid, ua_event->obj); - - health_code_update(); - - /* Set filter if one is present. */ - if (ua_event->filter) { - ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); - if (ret < 0) { - goto error; - } - } - - /* Set exclusions for the event */ - if (ua_event->exclusion) { - ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); - if (ret < 0) { - goto error; - } - } - - /* If event not enabled, disable it on the tracer */ - if (ua_event->enabled) { - /* - * We now need to explicitly enable the event, since it - * is now disabled at creation. - */ - ret = enable_ust_object(app, ua_event->obj); - if (ret < 0) { - /* - * If we hit an EPERM, something is wrong with our enable call. If - * we get an EEXIST, there is a problem on the tracer side since we - * just created it. - */ - switch (ret) { - case -LTTNG_UST_ERR_PERM: - /* Code flow problem */ - abort(); - case -LTTNG_UST_ERR_EXIST: - /* It's OK for our use case. */ - ret = 0; - break; - default: - break; - } - goto error; - } - } - -error: - health_code_update(); - return ret; -} - -static int init_ust_event_notifier_from_event_rule( - const struct lttng_event_rule *rule, - struct lttng_ust_abi_event_notifier *event_notifier) -{ - enum lttng_event_rule_status status; - enum lttng_ust_abi_loglevel_type ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; - int loglevel = -1, ret = 0; - const char *pattern; - - - memset(event_notifier, 0, sizeof(*event_notifier)); - - if (lttng_event_rule_targets_agent_domain(rule)) { - /* - * Special event for agents - * The actual meat of the event is in the filter that will be - * attached later on. - * Set the default values for the agent event. - */ - pattern = event_get_default_agent_ust_name( - lttng_event_rule_get_domain_type(rule)); - loglevel = 0; - ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; - } else { - const struct lttng_log_level_rule *log_level_rule; - - LTTNG_ASSERT(lttng_event_rule_get_type(rule) == - LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT); - - status = lttng_event_rule_user_tracepoint_get_name_pattern(rule, &pattern); - if (status != LTTNG_EVENT_RULE_STATUS_OK) { - /* At this point, this is a fatal error. */ - abort(); - } - - status = lttng_event_rule_user_tracepoint_get_log_level_rule( - rule, &log_level_rule); - if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { - ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_ALL; - } else if (status == LTTNG_EVENT_RULE_STATUS_OK) { - enum lttng_log_level_rule_status llr_status; - - switch (lttng_log_level_rule_get_type(log_level_rule)) { - case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: - ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_SINGLE; - llr_status = lttng_log_level_rule_exactly_get_level( - log_level_rule, &loglevel); - break; - case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: - ust_loglevel_type = LTTNG_UST_ABI_LOGLEVEL_RANGE; - llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( - log_level_rule, &loglevel); - break; - default: - abort(); - } - - LTTNG_ASSERT(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK); - } else { - /* At this point this is a fatal error. */ - abort(); - } - } - - event_notifier->event.instrumentation = LTTNG_UST_ABI_TRACEPOINT; - ret = lttng_strncpy(event_notifier->event.name, pattern, - LTTNG_UST_ABI_SYM_NAME_LEN - 1); - if (ret) { - ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", - pattern); - goto end; - } - - event_notifier->event.loglevel_type = ust_loglevel_type; - event_notifier->event.loglevel = loglevel; -end: - return ret; -} - -/* - * Create the specified event notifier against the user space tracer of a - * given application. - */ -static int create_ust_event_notifier(struct ust_app *app, - struct ust_app_event_notifier_rule *ua_event_notifier_rule) -{ - int ret = 0; - enum lttng_condition_status condition_status; - const struct lttng_condition *condition = NULL; - struct lttng_ust_abi_event_notifier event_notifier; - const struct lttng_event_rule *event_rule = NULL; - unsigned int capture_bytecode_count = 0, i; - enum lttng_condition_status cond_status; - enum lttng_event_rule_type event_rule_type; - - health_code_update(); - LTTNG_ASSERT(app->event_notifier_group.object); - - condition = lttng_trigger_get_const_condition( - ua_event_notifier_rule->trigger); - LTTNG_ASSERT(condition); - LTTNG_ASSERT(lttng_condition_get_type(condition) == - LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); - - condition_status = lttng_condition_event_rule_matches_get_rule( - condition, &event_rule); - LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); - - LTTNG_ASSERT(event_rule); - - event_rule_type = lttng_event_rule_get_type(event_rule); - LTTNG_ASSERT(event_rule_type == LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT || - event_rule_type == LTTNG_EVENT_RULE_TYPE_JUL_LOGGING || - event_rule_type == - LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING || - event_rule_type == - LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING); - - init_ust_event_notifier_from_event_rule(event_rule, &event_notifier); - event_notifier.event.token = ua_event_notifier_rule->token; - event_notifier.error_counter_index = ua_event_notifier_rule->error_counter_index; - - /* Create UST event notifier against the tracer. */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_create_event_notifier(app->sock, &event_notifier, - app->event_notifier_group.object, - &ua_event_notifier_rule->obj); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app create event notifier failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app create event notifier failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app create event notifier '%s' failed with ret %d: pid = %d, sock = %d", - event_notifier.event.name, ret, app->pid, - app->sock); - } - goto error; - } - - ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; - - DBG2("UST app event notifier %s created successfully: app = '%s': pid = %d), object = %p", - event_notifier.event.name, app->name, app->pid, - ua_event_notifier_rule->obj); - - health_code_update(); - - /* Set filter if one is present. */ - if (ua_event_notifier_rule->filter) { - ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, - ua_event_notifier_rule->obj); - if (ret < 0) { - goto error; - } - } - - /* Set exclusions for the event. */ - if (ua_event_notifier_rule->exclusion) { - ret = set_ust_object_exclusions(app, - ua_event_notifier_rule->exclusion, - ua_event_notifier_rule->obj); - if (ret < 0) { - goto error; - } - } - - /* Set the capture bytecodes. */ - cond_status = lttng_condition_event_rule_matches_get_capture_descriptor_count( - condition, &capture_bytecode_count); - LTTNG_ASSERT(cond_status == LTTNG_CONDITION_STATUS_OK); - - for (i = 0; i < capture_bytecode_count; i++) { - const struct lttng_bytecode *capture_bytecode = - lttng_condition_event_rule_matches_get_capture_bytecode_at_index( - condition, i); - - ret = set_ust_capture(app, capture_bytecode, i, - ua_event_notifier_rule->obj); - if (ret < 0) { - goto error; - } - } - - /* - * We now need to explicitly enable the event, since it - * is disabled at creation. - */ - ret = enable_ust_object(app, ua_event_notifier_rule->obj); - if (ret < 0) { - /* - * If we hit an EPERM, something is wrong with our enable call. - * If we get an EEXIST, there is a problem on the tracer side - * since we just created it. - */ - switch (ret) { - case -LTTNG_UST_ERR_PERM: - /* Code flow problem. */ - abort(); - case -LTTNG_UST_ERR_EXIST: - /* It's OK for our use case. */ - ret = 0; - break; - default: - break; - } - - goto error; - } - - ua_event_notifier_rule->enabled = true; - -error: - health_code_update(); - return ret; -} - -/* - * Copy data between an UST app event and a LTT event. - */ -static void shadow_copy_event(struct ust_app_event *ua_event, - struct ltt_ust_event *uevent) -{ - size_t exclusion_alloc_size; - - strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); - ua_event->name[sizeof(ua_event->name) - 1] = '\0'; - - ua_event->enabled = uevent->enabled; - - /* Copy event attributes */ - memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); - - /* Copy filter bytecode */ - if (uevent->filter) { - ua_event->filter = lttng_bytecode_copy(uevent->filter); - /* Filter might be NULL here in case of ENONEM. */ - } - - /* Copy exclusion data */ - if (uevent->exclusion) { - exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + - LTTNG_UST_ABI_SYM_NAME_LEN * uevent->exclusion->count; - ua_event->exclusion = zmalloc(exclusion_alloc_size); - if (ua_event->exclusion == NULL) { - PERROR("malloc"); - } else { - memcpy(ua_event->exclusion, uevent->exclusion, - exclusion_alloc_size); - } - } -} - -/* - * Copy data between an UST app channel and a LTT channel. - */ -static void shadow_copy_channel(struct ust_app_channel *ua_chan, - struct ltt_ust_channel *uchan) -{ - DBG2("UST app shadow copy of channel %s started", ua_chan->name); - - strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); - ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; - - ua_chan->tracefile_size = uchan->tracefile_size; - ua_chan->tracefile_count = uchan->tracefile_count; - - /* Copy event attributes since the layout is different. */ - ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; - ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; - ua_chan->attr.overwrite = uchan->attr.overwrite; - ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; - ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; - ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; - ua_chan->attr.output = uchan->attr.output; - ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; - - /* - * Note that the attribute channel type is not set since the channel on the - * tracing registry side does not have this information. - */ - - ua_chan->enabled = uchan->enabled; - ua_chan->tracing_channel_id = uchan->id; - - DBG3("UST app shadow copy of channel %s done", ua_chan->name); -} - -/* - * Copy data between a UST app session and a regular LTT session. - */ -static void shadow_copy_session(struct ust_app_session *ua_sess, - struct ltt_ust_session *usess, struct ust_app *app) -{ - struct tm *timeinfo; - char datetime[16]; - int ret; - char tmp_shm_path[PATH_MAX]; - - timeinfo = localtime(&app->registration_time); - strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); - - DBG2("Shadow copy of session handle %d", ua_sess->handle); - - ua_sess->tracing_id = usess->id; - ua_sess->id = get_next_session_id(); - LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); - LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); - LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); - LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); - ua_sess->buffer_type = usess->buffer_type; - ua_sess->bits_per_long = app->bits_per_long; - - /* There is only one consumer object per session possible. */ - consumer_output_get(usess->consumer); - ua_sess->consumer = usess->consumer; - - ua_sess->output_traces = usess->output_traces; - ua_sess->live_timer_interval = usess->live_timer_interval; - copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, - &usess->metadata_attr); - - switch (ua_sess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - ret = snprintf(ua_sess->path, sizeof(ua_sess->path), - DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, - datetime); - break; - case LTTNG_BUFFER_PER_UID: - ret = snprintf(ua_sess->path, sizeof(ua_sess->path), - DEFAULT_UST_TRACE_UID_PATH, - lttng_credentials_get_uid(&ua_sess->real_credentials), - app->bits_per_long); - break; - default: - abort(); - goto error; - } - if (ret < 0) { - PERROR("asprintf UST shadow copy session"); - abort(); - goto error; - } - - strncpy(ua_sess->root_shm_path, usess->root_shm_path, - sizeof(ua_sess->root_shm_path)); - ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; - strncpy(ua_sess->shm_path, usess->shm_path, - sizeof(ua_sess->shm_path)); - ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; - if (ua_sess->shm_path[0]) { - switch (ua_sess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), - "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", - app->name, app->pid, datetime); - break; - case LTTNG_BUFFER_PER_UID: - ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), - "/" DEFAULT_UST_TRACE_UID_PATH, - app->uid, app->bits_per_long); - break; - default: - abort(); - goto error; - } - if (ret < 0) { - PERROR("sprintf UST shadow copy session"); - abort(); - goto error; - } - strncat(ua_sess->shm_path, tmp_shm_path, - sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); - ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; - } - return; - -error: - consumer_output_put(ua_sess->consumer); -} - -/* - * Lookup sesison wrapper. - */ -static -void __lookup_session_by_app(const struct ltt_ust_session *usess, - struct ust_app *app, struct lttng_ht_iter *iter) -{ - /* Get right UST app session from app */ - lttng_ht_lookup(app->sessions, &usess->id, iter); -} - -/* - * Return ust app session from the app session hashtable using the UST session - * id. - */ -static struct ust_app_session *lookup_session_by_app( - const struct ltt_ust_session *usess, struct ust_app *app) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - - __lookup_session_by_app(usess, app, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node == NULL) { - goto error; - } - - return caa_container_of(node, struct ust_app_session, node); - -error: - return NULL; -} - -/* - * Setup buffer registry per PID for the given session and application. If none - * is found, a new one is created, added to the global registry and - * initialized. If regp is valid, it's set with the newly created object. - * - * Return 0 on success or else a negative value. - */ -static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, - struct ust_app *app, struct buffer_reg_pid **regp) -{ - int ret = 0; - struct buffer_reg_pid *reg_pid; - - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(app); - - rcu_read_lock(); - - reg_pid = buffer_reg_pid_find(ua_sess->id); - if (!reg_pid) { - /* - * This is the create channel path meaning that if there is NO - * registry available, we have to create one for this session. - */ - ret = buffer_reg_pid_create(ua_sess->id, ®_pid, - ua_sess->root_shm_path, ua_sess->shm_path); - if (ret < 0) { - goto error; - } - } else { - goto end; - } - - /* Initialize registry. */ - ret = ust_registry_session_init(®_pid->registry->reg.ust, app, - app->bits_per_long, app->uint8_t_alignment, - app->uint16_t_alignment, app->uint32_t_alignment, - app->uint64_t_alignment, app->long_alignment, - app->byte_order, app->version.major, app->version.minor, - reg_pid->root_shm_path, reg_pid->shm_path, - lttng_credentials_get_uid(&ua_sess->effective_credentials), - lttng_credentials_get_gid(&ua_sess->effective_credentials), - ua_sess->tracing_id, - app->uid); - if (ret < 0) { - /* - * reg_pid->registry->reg.ust is NULL upon error, so we need to - * destroy the buffer registry, because it is always expected - * that if the buffer registry can be found, its ust registry is - * non-NULL. - */ - buffer_reg_pid_destroy(reg_pid); - goto error; - } - - buffer_reg_pid_add(reg_pid); - - DBG3("UST app buffer registry per PID created successfully"); - -end: - if (regp) { - *regp = reg_pid; - } -error: - rcu_read_unlock(); - return ret; -} - -/* - * Setup buffer registry per UID for the given session and application. If none - * is found, a new one is created, added to the global registry and - * initialized. If regp is valid, it's set with the newly created object. - * - * Return 0 on success or else a negative value. - */ -static int setup_buffer_reg_uid(struct ltt_ust_session *usess, - struct ust_app_session *ua_sess, - struct ust_app *app, struct buffer_reg_uid **regp) -{ - int ret = 0; - struct buffer_reg_uid *reg_uid; - - LTTNG_ASSERT(usess); - LTTNG_ASSERT(app); - - rcu_read_lock(); - - reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); - if (!reg_uid) { - /* - * This is the create channel path meaning that if there is NO - * registry available, we have to create one for this session. - */ - ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, - LTTNG_DOMAIN_UST, ®_uid, - ua_sess->root_shm_path, ua_sess->shm_path); - if (ret < 0) { - goto error; - } - } else { - goto end; - } - - /* Initialize registry. */ - ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, - app->bits_per_long, app->uint8_t_alignment, - app->uint16_t_alignment, app->uint32_t_alignment, - app->uint64_t_alignment, app->long_alignment, - app->byte_order, app->version.major, - app->version.minor, reg_uid->root_shm_path, - reg_uid->shm_path, usess->uid, usess->gid, - ua_sess->tracing_id, app->uid); - if (ret < 0) { - /* - * reg_uid->registry->reg.ust is NULL upon error, so we need to - * destroy the buffer registry, because it is always expected - * that if the buffer registry can be found, its ust registry is - * non-NULL. - */ - buffer_reg_uid_destroy(reg_uid, NULL); - goto error; - } - /* Add node to teardown list of the session. */ - cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); - - buffer_reg_uid_add(reg_uid); - - DBG3("UST app buffer registry per UID created successfully"); -end: - if (regp) { - *regp = reg_uid; - } -error: - rcu_read_unlock(); - return ret; -} - -/* - * Create a session on the tracer side for the given app. - * - * On success, ua_sess_ptr is populated with the session pointer or else left - * untouched. If the session was created, is_created is set to 1. On error, - * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can - * be NULL. - * - * Returns 0 on success or else a negative code which is either -ENOMEM or - * -ENOTCONN which is the default code if the lttng_ust_ctl_create_session fails. - */ -static int find_or_create_ust_app_session(struct ltt_ust_session *usess, - struct ust_app *app, struct ust_app_session **ua_sess_ptr, - int *is_created) -{ - int ret, created = 0; - struct ust_app_session *ua_sess; - - LTTNG_ASSERT(usess); - LTTNG_ASSERT(app); - LTTNG_ASSERT(ua_sess_ptr); - - health_code_update(); - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", - app->pid, usess->id); - ua_sess = alloc_ust_app_session(); - if (ua_sess == NULL) { - /* Only malloc can failed so something is really wrong */ - ret = -ENOMEM; - goto error; - } - shadow_copy_session(ua_sess, usess, app); - created = 1; - } - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - /* Init local registry. */ - ret = setup_buffer_reg_pid(ua_sess, app, NULL); - if (ret < 0) { - delete_ust_app_session(-1, ua_sess, app); - goto error; - } - break; - case LTTNG_BUFFER_PER_UID: - /* Look for a global registry. If none exists, create one. */ - ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); - if (ret < 0) { - delete_ust_app_session(-1, ua_sess, app); - goto error; - } - break; - default: - abort(); - ret = -EINVAL; - goto error; - } - - health_code_update(); - - if (ua_sess->handle == -1) { - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_create_session(app->sock); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG("UST app creating session failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - ret = 0; - } else if (ret == -EAGAIN) { - DBG("UST app creating session failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - ret = 0; - } else { - ERR("UST app creating session failed with ret %d: pid = %d, sock =%d", - ret, app->pid, app->sock); - } - delete_ust_app_session(-1, ua_sess, app); - if (ret != -ENOMEM) { - /* - * Tracer is probably gone or got an internal error so let's - * behave like it will soon unregister or not usable. - */ - ret = -ENOTCONN; - } - goto error; - } - - ua_sess->handle = ret; - - /* Add ust app session to app's HT */ - lttng_ht_node_init_u64(&ua_sess->node, - ua_sess->tracing_id); - lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); - lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); - lttng_ht_add_unique_ulong(app->ust_sessions_objd, - &ua_sess->ust_objd_node); - - DBG2("UST app session created successfully with handle %d", ret); - } - - *ua_sess_ptr = ua_sess; - if (is_created) { - *is_created = created; - } - - /* Everything went well. */ - ret = 0; - -error: - health_code_update(); - return ret; -} - -/* - * Match function for a hash table lookup of ust_app_ctx. - * - * It matches an ust app context based on the context type and, in the case - * of perf counters, their name. - */ -static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) -{ - struct ust_app_ctx *ctx; - const struct lttng_ust_context_attr *key; - - LTTNG_ASSERT(node); - LTTNG_ASSERT(_key); - - ctx = caa_container_of(node, struct ust_app_ctx, node.node); - key = _key; - - /* Context type */ - if (ctx->ctx.ctx != key->ctx) { - goto no_match; - } - - switch(key->ctx) { - case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: - if (strncmp(key->u.perf_counter.name, - ctx->ctx.u.perf_counter.name, - sizeof(key->u.perf_counter.name))) { - goto no_match; - } - break; - case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: - if (strcmp(key->u.app_ctx.provider_name, - ctx->ctx.u.app_ctx.provider_name) || - strcmp(key->u.app_ctx.ctx_name, - ctx->ctx.u.app_ctx.ctx_name)) { - goto no_match; - } - break; - default: - break; - } - - /* Match. */ - return 1; - -no_match: - return 0; -} - -/* - * Lookup for an ust app context from an lttng_ust_context. - * - * Must be called while holding RCU read side lock. - * Return an ust_app_ctx object or NULL on error. - */ -static -struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, - struct lttng_ust_context_attr *uctx) -{ - struct lttng_ht_iter iter; - struct lttng_ht_node_ulong *node; - struct ust_app_ctx *app_ctx = NULL; - - LTTNG_ASSERT(uctx); - LTTNG_ASSERT(ht); - - /* Lookup using the lttng_ust_context_type and a custom match fct. */ - cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), - ht_match_ust_app_ctx, uctx, &iter.iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (!node) { - goto end; - } - - app_ctx = caa_container_of(node, struct ust_app_ctx, node); - -end: - return app_ctx; -} - -/* - * Create a context for the channel on the tracer. - * - * Called with UST app session lock held and a RCU read side lock. - */ -static -int create_ust_app_channel_context(struct ust_app_channel *ua_chan, - struct lttng_ust_context_attr *uctx, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_ctx *ua_ctx; - - DBG2("UST app adding context to channel %s", ua_chan->name); - - ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); - if (ua_ctx) { - ret = -EEXIST; - goto error; - } - - ua_ctx = alloc_ust_app_ctx(uctx); - if (ua_ctx == NULL) { - /* malloc failed */ - ret = -ENOMEM; - goto error; - } - - lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); - lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); - cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); - - ret = create_ust_channel_context(ua_chan, ua_ctx, app); - if (ret < 0) { - goto error; - } - -error: - return ret; -} - -/* - * Enable on the tracer side a ust app event for the session and channel. - * - * Called with UST app session lock held. - */ -static -int enable_ust_app_event(struct ust_app_session *ua_sess, - struct ust_app_event *ua_event, struct ust_app *app) -{ - int ret; - - ret = enable_ust_object(app, ua_event->obj); - if (ret < 0) { - goto error; - } - - ua_event->enabled = 1; - -error: - return ret; -} - -/* - * Disable on the tracer side a ust app event for the session and channel. - */ -static int disable_ust_app_event(struct ust_app_session *ua_sess, - struct ust_app_event *ua_event, struct ust_app *app) -{ - int ret; - - ret = disable_ust_object(app, ua_event->obj); - if (ret < 0) { - goto error; - } - - ua_event->enabled = 0; - -error: - return ret; -} - -/* - * Lookup ust app channel for session and disable it on the tracer side. - */ -static -int disable_ust_app_channel(struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan, struct ust_app *app) -{ - int ret; - - ret = disable_ust_channel(app, ua_sess, ua_chan); - if (ret < 0) { - goto error; - } - - ua_chan->enabled = 0; - -error: - return ret; -} - -/* - * Lookup ust app channel for session and enable it on the tracer side. This - * MUST be called with a RCU read side lock acquired. - */ -static int enable_ust_app_channel(struct ust_app_session *ua_sess, - struct ltt_ust_channel *uchan, struct ust_app *app) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app_channel *ua_chan; - - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); - ua_chan_node = lttng_ht_iter_get_node_str(&iter); - if (ua_chan_node == NULL) { - DBG2("Unable to find channel %s in ust session id %" PRIu64, - uchan->name, ua_sess->tracing_id); - goto error; - } - - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - - ret = enable_ust_channel(app, ua_sess, ua_chan); - if (ret < 0) { - goto error; - } - -error: - return ret; -} - -/* - * Ask the consumer to create a channel and get it if successful. - * - * Called with UST app session lock held. - * - * Return 0 on success or else a negative value. - */ -static int do_consumer_create_channel(struct ltt_ust_session *usess, - struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, - int bitness, struct ust_registry_session *registry, - uint64_t trace_archive_id) -{ - int ret; - unsigned int nb_fd = 0; - struct consumer_socket *socket; - - LTTNG_ASSERT(usess); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - LTTNG_ASSERT(registry); - - rcu_read_lock(); - health_code_update(); - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness(bitness, usess->consumer); - if (!socket) { - ret = -EINVAL; - goto error; - } - - health_code_update(); - - /* Need one fd for the channel. */ - ret = lttng_fd_get(LTTNG_FD_APPS, 1); - if (ret < 0) { - ERR("Exhausted number of available FD upon create channel"); - goto error; - } - - /* - * Ask consumer to create channel. The consumer will return the number of - * stream we have to expect. - */ - ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, - registry, usess->current_trace_chunk); - if (ret < 0) { - goto error_ask; - } - - /* - * Compute the number of fd needed before receiving them. It must be 2 per - * stream (2 being the default value here). - */ - nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; - - /* Reserve the amount of file descriptor we need. */ - ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); - if (ret < 0) { - ERR("Exhausted number of available FD upon create channel"); - goto error_fd_get_stream; - } - - health_code_update(); - - /* - * Now get the channel from the consumer. This call will populate the stream - * list of that channel and set the ust objects. - */ - if (usess->consumer->enabled) { - ret = ust_consumer_get_channel(socket, ua_chan); - if (ret < 0) { - goto error_destroy; - } - } - - rcu_read_unlock(); - return 0; - -error_destroy: - lttng_fd_put(LTTNG_FD_APPS, nb_fd); -error_fd_get_stream: - /* - * Initiate a destroy channel on the consumer since we had an error - * handling it on our side. The return value is of no importance since we - * already have a ret value set by the previous error that we need to - * return. - */ - (void) ust_consumer_destroy_channel(socket, ua_chan); -error_ask: - lttng_fd_put(LTTNG_FD_APPS, 1); -error: - health_code_update(); - rcu_read_unlock(); - return ret; -} - -/* - * Duplicate the ust data object of the ust app stream and save it in the - * buffer registry stream. - * - * Return 0 on success or else a negative value. - */ -static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, - struct ust_app_stream *stream) -{ - int ret; - - LTTNG_ASSERT(reg_stream); - LTTNG_ASSERT(stream); - - /* Duplicating a stream requires 2 new fds. Reserve them. */ - ret = lttng_fd_get(LTTNG_FD_APPS, 2); - if (ret < 0) { - ERR("Exhausted number of available FD upon duplicate stream"); - goto error; - } - - /* Duplicate object for stream once the original is in the registry. */ - ret = lttng_ust_ctl_duplicate_ust_object_data(&stream->obj, - reg_stream->obj.ust); - if (ret < 0) { - ERR("Duplicate stream obj from %p to %p failed with ret %d", - reg_stream->obj.ust, stream->obj, ret); - lttng_fd_put(LTTNG_FD_APPS, 2); - goto error; - } - stream->handle = stream->obj->handle; - -error: - return ret; -} - -/* - * Duplicate the ust data object of the ust app. channel and save it in the - * buffer registry channel. - * - * Return 0 on success or else a negative value. - */ -static int duplicate_channel_object(struct buffer_reg_channel *buf_reg_chan, - struct ust_app_channel *ua_chan) -{ - int ret; - - LTTNG_ASSERT(buf_reg_chan); - LTTNG_ASSERT(ua_chan); - - /* Duplicating a channel requires 1 new fd. Reserve it. */ - ret = lttng_fd_get(LTTNG_FD_APPS, 1); - if (ret < 0) { - ERR("Exhausted number of available FD upon duplicate channel"); - goto error_fd_get; - } - - /* Duplicate object for stream once the original is in the registry. */ - ret = lttng_ust_ctl_duplicate_ust_object_data(&ua_chan->obj, buf_reg_chan->obj.ust); - if (ret < 0) { - ERR("Duplicate channel obj from %p to %p failed with ret: %d", - buf_reg_chan->obj.ust, ua_chan->obj, ret); - goto error; - } - ua_chan->handle = ua_chan->obj->handle; - - return 0; - -error: - lttng_fd_put(LTTNG_FD_APPS, 1); -error_fd_get: - return ret; -} - -/* - * For a given channel buffer registry, setup all streams of the given ust - * application channel. - * - * Return 0 on success or else a negative value. - */ -static int setup_buffer_reg_streams(struct buffer_reg_channel *buf_reg_chan, - struct ust_app_channel *ua_chan, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_stream *stream, *stmp; - - LTTNG_ASSERT(buf_reg_chan); - LTTNG_ASSERT(ua_chan); - - DBG2("UST app setup buffer registry stream"); - - /* Send all streams to application. */ - cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { - struct buffer_reg_stream *reg_stream; - - ret = buffer_reg_stream_create(®_stream); - if (ret < 0) { - goto error; - } - - /* - * Keep original pointer and nullify it in the stream so the delete - * stream call does not release the object. - */ - reg_stream->obj.ust = stream->obj; - stream->obj = NULL; - buffer_reg_stream_add(reg_stream, buf_reg_chan); - - /* We don't need the streams anymore. */ - cds_list_del(&stream->list); - delete_ust_app_stream(-1, stream, app); - } - -error: - return ret; -} - -/* - * Create a buffer registry channel for the given session registry and - * application channel object. If regp pointer is valid, it's set with the - * created object. Important, the created object is NOT added to the session - * registry hash table. - * - * Return 0 on success else a negative value. - */ -static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, - struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) -{ - int ret; - struct buffer_reg_channel *buf_reg_chan = NULL; - - LTTNG_ASSERT(reg_sess); - LTTNG_ASSERT(ua_chan); - - DBG2("UST app creating buffer registry channel for %s", ua_chan->name); - - /* Create buffer registry channel. */ - ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, &buf_reg_chan); - if (ret < 0) { - goto error_create; - } - LTTNG_ASSERT(buf_reg_chan); - buf_reg_chan->consumer_key = ua_chan->key; - buf_reg_chan->subbuf_size = ua_chan->attr.subbuf_size; - buf_reg_chan->num_subbuf = ua_chan->attr.num_subbuf; - - /* Create and add a channel registry to session. */ - ret = ust_registry_channel_add(reg_sess->reg.ust, - ua_chan->tracing_channel_id); - if (ret < 0) { - goto error; - } - buffer_reg_channel_add(reg_sess, buf_reg_chan); - - if (regp) { - *regp = buf_reg_chan; - } - - return 0; - -error: - /* Safe because the registry channel object was not added to any HT. */ - buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); -error_create: - return ret; -} - -/* - * Setup buffer registry channel for the given session registry and application - * channel object. If regp pointer is valid, it's set with the created object. - * - * Return 0 on success else a negative value. - */ -static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, - struct ust_app_channel *ua_chan, struct buffer_reg_channel *buf_reg_chan, - struct ust_app *app) -{ - int ret; - - LTTNG_ASSERT(reg_sess); - LTTNG_ASSERT(buf_reg_chan); - LTTNG_ASSERT(ua_chan); - LTTNG_ASSERT(ua_chan->obj); - - DBG2("UST app setup buffer registry channel for %s", ua_chan->name); - - /* Setup all streams for the registry. */ - ret = setup_buffer_reg_streams(buf_reg_chan, ua_chan, app); - if (ret < 0) { - goto error; - } - - buf_reg_chan->obj.ust = ua_chan->obj; - ua_chan->obj = NULL; - - return 0; - -error: - buffer_reg_channel_remove(reg_sess, buf_reg_chan); - buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); - return ret; -} - -/* - * Send buffer registry channel to the application. - * - * Return 0 on success else a negative value. - */ -static int send_channel_uid_to_ust(struct buffer_reg_channel *buf_reg_chan, - struct ust_app *app, struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan) -{ - int ret; - struct buffer_reg_stream *reg_stream; - - LTTNG_ASSERT(buf_reg_chan); - LTTNG_ASSERT(app); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - - DBG("UST app sending buffer registry channel to ust sock %d", app->sock); - - ret = duplicate_channel_object(buf_reg_chan, ua_chan); - if (ret < 0) { - goto error; - } - - /* Send channel to the application. */ - ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = -ENOTCONN; /* Caused by app exiting. */ - goto error; - } else if (ret == -EAGAIN) { - /* Caused by timeout. */ - WARN("Communication with application %d timed out on send_channel for channel \"%s\" of session \"%" PRIu64 "\".", - app->pid, ua_chan->name, ua_sess->tracing_id); - /* Treat this the same way as an application that is exiting. */ - ret = -ENOTCONN; - goto error; - } else if (ret < 0) { - goto error; - } - - health_code_update(); - - /* Send all streams to application. */ - pthread_mutex_lock(&buf_reg_chan->stream_list_lock); - cds_list_for_each_entry(reg_stream, &buf_reg_chan->streams, lnode) { - struct ust_app_stream stream; - - ret = duplicate_stream_object(reg_stream, &stream); - if (ret < 0) { - goto error_stream_unlock; - } - - ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = -ENOTCONN; /* Caused by app exiting. */ - } else if (ret == -EAGAIN) { - /* - * Caused by timeout. - * Treat this the same way as an application - * that is exiting. - */ - WARN("Communication with application %d timed out on send_stream for stream \"%s\" of channel \"%s\" of session \"%" PRIu64 "\".", - app->pid, stream.name, - ua_chan->name, - ua_sess->tracing_id); - ret = -ENOTCONN; - } - (void) release_ust_app_stream(-1, &stream, app); - goto error_stream_unlock; - } - - /* - * The return value is not important here. This function will output an - * error if needed. - */ - (void) release_ust_app_stream(-1, &stream, app); - } - ua_chan->is_sent = 1; - -error_stream_unlock: - pthread_mutex_unlock(&buf_reg_chan->stream_list_lock); -error: - return ret; -} - -/* - * Create and send to the application the created buffers with per UID buffers. - * - * This MUST be called with a RCU read side lock acquired. - * The session list lock and the session's lock must be acquired. - * - * Return 0 on success else a negative value. - */ -static int create_channel_per_uid(struct ust_app *app, - struct ltt_ust_session *usess, struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan) -{ - int ret; - struct buffer_reg_uid *reg_uid; - struct buffer_reg_channel *buf_reg_chan; - struct ltt_session *session = NULL; - enum lttng_error_code notification_ret; - struct ust_registry_channel *ust_reg_chan; - - LTTNG_ASSERT(app); - LTTNG_ASSERT(usess); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - - DBG("UST app creating channel %s with per UID buffers", ua_chan->name); - - reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); - /* - * The session creation handles the creation of this global registry - * object. If none can be find, there is a code flow problem or a - * teardown race. - */ - LTTNG_ASSERT(reg_uid); - - buf_reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, - reg_uid); - if (buf_reg_chan) { - goto send_channel; - } - - /* Create the buffer registry channel object. */ - ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, &buf_reg_chan); - if (ret < 0) { - ERR("Error creating the UST channel \"%s\" registry instance", - ua_chan->name); - goto error; - } - - session = session_find_by_id(ua_sess->tracing_id); - LTTNG_ASSERT(session); - LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); - LTTNG_ASSERT(session_trylock_list()); - - /* - * Create the buffers on the consumer side. This call populates the - * ust app channel object with all streams and data object. - */ - ret = do_consumer_create_channel(usess, ua_sess, ua_chan, - app->bits_per_long, reg_uid->registry->reg.ust, - session->most_recent_chunk_id.value); - if (ret < 0) { - ERR("Error creating UST channel \"%s\" on the consumer daemon", - ua_chan->name); - - /* - * Let's remove the previously created buffer registry channel so - * it's not visible anymore in the session registry. - */ - ust_registry_channel_del_free(reg_uid->registry->reg.ust, - ua_chan->tracing_channel_id, false); - buffer_reg_channel_remove(reg_uid->registry, buf_reg_chan); - buffer_reg_channel_destroy(buf_reg_chan, LTTNG_DOMAIN_UST); - goto error; - } - - /* - * Setup the streams and add it to the session registry. - */ - ret = setup_buffer_reg_channel(reg_uid->registry, - ua_chan, buf_reg_chan, app); - if (ret < 0) { - ERR("Error setting up UST channel \"%s\"", ua_chan->name); - goto error; - } - - /* Notify the notification subsystem of the channel's creation. */ - pthread_mutex_lock(®_uid->registry->reg.ust->lock); - ust_reg_chan = ust_registry_channel_find(reg_uid->registry->reg.ust, - ua_chan->tracing_channel_id); - LTTNG_ASSERT(ust_reg_chan); - ust_reg_chan->consumer_key = ua_chan->key; - ust_reg_chan = NULL; - pthread_mutex_unlock(®_uid->registry->reg.ust->lock); - - notification_ret = notification_thread_command_add_channel( - the_notification_thread_handle, session->name, - lttng_credentials_get_uid( - &ua_sess->effective_credentials), - lttng_credentials_get_gid( - &ua_sess->effective_credentials), - ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, - ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); - if (notification_ret != LTTNG_OK) { - ret = - (int) notification_ret; - ERR("Failed to add channel to notification thread"); - goto error; - } - -send_channel: - /* Send buffers to the application. */ - ret = send_channel_uid_to_ust(buf_reg_chan, app, ua_sess, ua_chan); - if (ret < 0) { - if (ret != -ENOTCONN) { - ERR("Error sending channel to application"); - } - goto error; - } - -error: - if (session) { - session_put(session); - } - return ret; -} - -/* - * Create and send to the application the created buffers with per PID buffers. - * - * Called with UST app session lock held. - * The session list lock and the session's lock must be acquired. - * - * Return 0 on success else a negative value. - */ -static int create_channel_per_pid(struct ust_app *app, - struct ltt_ust_session *usess, struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan) -{ - int ret; - struct ust_registry_session *registry; - enum lttng_error_code cmd_ret; - struct ltt_session *session = NULL; - uint64_t chan_reg_key; - struct ust_registry_channel *ust_reg_chan; - - LTTNG_ASSERT(app); - LTTNG_ASSERT(usess); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - - DBG("UST app creating channel %s with per PID buffers", ua_chan->name); - - rcu_read_lock(); - - registry = get_session_registry(ua_sess); - /* The UST app session lock is held, registry shall not be null. */ - LTTNG_ASSERT(registry); - - /* Create and add a new channel registry to session. */ - ret = ust_registry_channel_add(registry, ua_chan->key); - if (ret < 0) { - ERR("Error creating the UST channel \"%s\" registry instance", - ua_chan->name); - goto error; - } - - session = session_find_by_id(ua_sess->tracing_id); - LTTNG_ASSERT(session); - - LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); - LTTNG_ASSERT(session_trylock_list()); - - /* Create and get channel on the consumer side. */ - ret = do_consumer_create_channel(usess, ua_sess, ua_chan, - app->bits_per_long, registry, - session->most_recent_chunk_id.value); - if (ret < 0) { - ERR("Error creating UST channel \"%s\" on the consumer daemon", - ua_chan->name); - goto error_remove_from_registry; - } - - ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); - if (ret < 0) { - if (ret != -ENOTCONN) { - ERR("Error sending channel to application"); - } - goto error_remove_from_registry; - } - - chan_reg_key = ua_chan->key; - pthread_mutex_lock(®istry->lock); - ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); - LTTNG_ASSERT(ust_reg_chan); - ust_reg_chan->consumer_key = ua_chan->key; - pthread_mutex_unlock(®istry->lock); - - cmd_ret = notification_thread_command_add_channel( - the_notification_thread_handle, session->name, - lttng_credentials_get_uid( - &ua_sess->effective_credentials), - lttng_credentials_get_gid( - &ua_sess->effective_credentials), - ua_chan->name, ua_chan->key, LTTNG_DOMAIN_UST, - ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); - if (cmd_ret != LTTNG_OK) { - ret = - (int) cmd_ret; - ERR("Failed to add channel to notification thread"); - goto error_remove_from_registry; - } - -error_remove_from_registry: - if (ret) { - ust_registry_channel_del_free(registry, ua_chan->key, false); - } -error: - rcu_read_unlock(); - if (session) { - session_put(session); - } - return ret; -} - -/* - * From an already allocated ust app channel, create the channel buffers if - * needed and send them to the application. This MUST be called with a RCU read - * side lock acquired. - * - * Called with UST app session lock held. - * - * Return 0 on success or else a negative value. Returns -ENOTCONN if - * the application exited concurrently. - */ -static int ust_app_channel_send(struct ust_app *app, - struct ltt_ust_session *usess, struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan) -{ - int ret; - - LTTNG_ASSERT(app); - LTTNG_ASSERT(usess); - LTTNG_ASSERT(usess->active); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(ua_chan); - - /* Handle buffer type before sending the channel to the application. */ - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); - if (ret < 0) { - goto error; - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); - if (ret < 0) { - goto error; - } - break; - } - default: - abort(); - ret = -EINVAL; - goto error; - } - - /* Initialize ust objd object using the received handle and add it. */ - lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); - lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); - - /* If channel is not enabled, disable it on the tracer */ - if (!ua_chan->enabled) { - ret = disable_ust_channel(app, ua_sess, ua_chan); - if (ret < 0) { - goto error; - } - } - -error: - return ret; -} - -/* - * Create UST app channel and return it through ua_chanp if not NULL. - * - * Called with UST app session lock and RCU read-side lock held. - * - * Return 0 on success or else a negative value. - */ -static int ust_app_channel_allocate(struct ust_app_session *ua_sess, - struct ltt_ust_channel *uchan, - enum lttng_ust_abi_chan_type type, struct ltt_ust_session *usess, - struct ust_app_channel **ua_chanp) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app_channel *ua_chan; - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); - ua_chan_node = lttng_ht_iter_get_node_str(&iter); - if (ua_chan_node != NULL) { - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - goto end; - } - - ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); - if (ua_chan == NULL) { - /* Only malloc can fail here */ - ret = -ENOMEM; - goto error; - } - shadow_copy_channel(ua_chan, uchan); - - /* Set channel type. */ - ua_chan->attr.type = type; - - /* Only add the channel if successful on the tracer side. */ - lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); -end: - if (ua_chanp) { - *ua_chanp = ua_chan; - } - - /* Everything went well. */ - return 0; - -error: - return ret; -} - -/* - * Create UST app event and create it on the tracer side. - * - * Must be called with the RCU read side lock held. - * Called with ust app session mutex held. - */ -static -int create_ust_app_event(struct ust_app_session *ua_sess, - struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_event *ua_event; - - ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); - if (ua_event == NULL) { - /* Only failure mode of alloc_ust_app_event(). */ - ret = -ENOMEM; - goto end; - } - shadow_copy_event(ua_event, uevent); - - /* Create it on the tracer side */ - ret = create_ust_event(app, ua_sess, ua_chan, ua_event); - if (ret < 0) { - /* - * Not found previously means that it does not exist on the - * tracer. If the application reports that the event existed, - * it means there is a bug in the sessiond or lttng-ust - * (or corruption, etc.) - */ - if (ret == -LTTNG_UST_ERR_EXIST) { - ERR("Tracer for application reported that an event being created already existed: " - "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", - uevent->attr.name, - app->pid, app->ppid, app->uid, - app->gid); - } - goto error; - } - - add_unique_ust_app_event(ua_chan, ua_event); - - DBG2("UST app create event completed: app = '%s' pid = %d", - app->name, app->pid); - -end: - return ret; - -error: - /* Valid. Calling here is already in a read side lock */ - delete_ust_app_event(-1, ua_event, app); - return ret; -} - -/* - * Create UST app event notifier rule and create it on the tracer side. - * - * Must be called with the RCU read side lock held. - * Called with ust app session mutex held. - */ -static -int create_ust_app_event_notifier_rule(struct lttng_trigger *trigger, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_event_notifier_rule *ua_event_notifier_rule; - - ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(trigger); - if (ua_event_notifier_rule == NULL) { - ret = -ENOMEM; - goto end; - } - - /* Create it on the tracer side. */ - ret = create_ust_event_notifier(app, ua_event_notifier_rule); - if (ret < 0) { - /* - * Not found previously means that it does not exist on the - * tracer. If the application reports that the event existed, - * it means there is a bug in the sessiond or lttng-ust - * (or corruption, etc.) - */ - if (ret == -LTTNG_UST_ERR_EXIST) { - ERR("Tracer for application reported that an event notifier being created already exists: " - "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", - lttng_trigger_get_tracer_token(trigger), - app->pid, app->ppid, app->uid, - app->gid); - } - goto error; - } - - lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, - &ua_event_notifier_rule->node); - - DBG2("UST app create token event rule completed: app = '%s', pid = %d), token = %" PRIu64, - app->name, app->pid, lttng_trigger_get_tracer_token(trigger)); - - goto end; - -error: - /* The RCU read side lock is already being held by the caller. */ - delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); -end: - return ret; -} - -/* - * Create UST metadata and open it on the tracer side. - * - * Called with UST app session lock held and RCU read side lock. - */ -static int create_ust_app_metadata(struct ust_app_session *ua_sess, - struct ust_app *app, struct consumer_output *consumer) -{ - int ret = 0; - struct ust_app_channel *metadata; - struct consumer_socket *socket; - struct ust_registry_session *registry; - struct ltt_session *session = NULL; - - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(app); - LTTNG_ASSERT(consumer); - - registry = get_session_registry(ua_sess); - /* The UST app session is held registry shall not be null. */ - LTTNG_ASSERT(registry); - - pthread_mutex_lock(®istry->lock); - - /* Metadata already exists for this registry or it was closed previously */ - if (registry->metadata_key || registry->metadata_closed) { - ret = 0; - goto error; - } - - /* Allocate UST metadata */ - metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); - if (!metadata) { - /* malloc() failed */ - ret = -ENOMEM; - goto error; - } - - memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); - - /* Need one fd for the channel. */ - ret = lttng_fd_get(LTTNG_FD_APPS, 1); - if (ret < 0) { - ERR("Exhausted number of available FD upon create metadata"); - goto error; - } - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); - if (!socket) { - ret = -EINVAL; - goto error_consumer; - } - - /* - * Keep metadata key so we can identify it on the consumer side. Assign it - * to the registry *before* we ask the consumer so we avoid the race of the - * consumer requesting the metadata and the ask_channel call on our side - * did not returned yet. - */ - registry->metadata_key = metadata->key; - - session = session_find_by_id(ua_sess->tracing_id); - LTTNG_ASSERT(session); - - LTTNG_ASSERT(pthread_mutex_trylock(&session->lock)); - LTTNG_ASSERT(session_trylock_list()); - - /* - * Ask the metadata channel creation to the consumer. The metadata object - * will be created by the consumer and kept their. However, the stream is - * never added or monitored until we do a first push metadata to the - * consumer. - */ - ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, - registry, session->current_trace_chunk); - if (ret < 0) { - /* Nullify the metadata key so we don't try to close it later on. */ - registry->metadata_key = 0; - goto error_consumer; - } - - /* - * The setup command will make the metadata stream be sent to the relayd, - * if applicable, and the thread managing the metadatas. This is important - * because after this point, if an error occurs, the only way the stream - * can be deleted is to be monitored in the consumer. - */ - ret = consumer_setup_metadata(socket, metadata->key); - if (ret < 0) { - /* Nullify the metadata key so we don't try to close it later on. */ - registry->metadata_key = 0; - goto error_consumer; - } - - DBG2("UST metadata with key %" PRIu64 " created for app pid %d", - metadata->key, app->pid); - -error_consumer: - lttng_fd_put(LTTNG_FD_APPS, 1); - delete_ust_app_channel(-1, metadata, app); -error: - pthread_mutex_unlock(®istry->lock); - if (session) { - session_put(session); - } - return ret; -} - -/* - * Return ust app pointer or NULL if not found. RCU read side lock MUST be - * acquired before calling this function. - */ -struct ust_app *ust_app_find_by_pid(pid_t pid) -{ - struct ust_app *app = NULL; - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - - lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app no found with pid %d", pid); - goto error; - } - - DBG2("Found UST app by pid %d", pid); - - app = caa_container_of(node, struct ust_app, pid_n); - -error: - return app; -} - -/* - * Allocate and init an UST app object using the registration information and - * the command socket. This is called when the command socket connects to the - * session daemon. - * - * The object is returned on success or else NULL. - */ -struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) -{ - int ret; - struct ust_app *lta = NULL; - struct lttng_pipe *event_notifier_event_source_pipe = NULL; - - LTTNG_ASSERT(msg); - LTTNG_ASSERT(sock >= 0); - - DBG3("UST app creating application for socket %d", sock); - - if ((msg->bits_per_long == 64 && - (uatomic_read(&the_ust_consumerd64_fd) == - -EINVAL)) || - (msg->bits_per_long == 32 && - (uatomic_read(&the_ust_consumerd32_fd) == - -EINVAL))) { - ERR("Registration failed: application \"%s\" (pid: %d) has " - "%d-bit long, but no consumerd for this size is available.\n", - msg->name, msg->pid, msg->bits_per_long); - goto error; - } - - /* - * Reserve the two file descriptors of the event source pipe. The write - * end will be closed once it is passed to the application, at which - * point a single 'put' will be performed. - */ - ret = lttng_fd_get(LTTNG_FD_APPS, 2); - if (ret) { - ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s', pid = %d", - msg->name, (int) msg->pid); - goto error; - } - - event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); - if (!event_notifier_event_source_pipe) { - PERROR("Failed to open application event source pipe: '%s' (pid = %d)", - msg->name, msg->pid); - goto error; - } - - lta = zmalloc(sizeof(struct ust_app)); - if (lta == NULL) { - PERROR("malloc"); - goto error_free_pipe; - } - - lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; - - lta->ppid = msg->ppid; - lta->uid = msg->uid; - lta->gid = msg->gid; - - lta->bits_per_long = msg->bits_per_long; - lta->uint8_t_alignment = msg->uint8_t_alignment; - lta->uint16_t_alignment = msg->uint16_t_alignment; - lta->uint32_t_alignment = msg->uint32_t_alignment; - lta->uint64_t_alignment = msg->uint64_t_alignment; - lta->long_alignment = msg->long_alignment; - lta->byte_order = msg->byte_order; - - lta->v_major = msg->major; - lta->v_minor = msg->minor; - lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - lta->notify_sock = -1; - lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); - - /* Copy name and make sure it's NULL terminated. */ - strncpy(lta->name, msg->name, sizeof(lta->name)); - lta->name[UST_APP_PROCNAME_LEN] = '\0'; - - /* - * Before this can be called, when receiving the registration information, - * the application compatibility is checked. So, at this point, the - * application can work with this session daemon. - */ - lta->compatible = 1; - - lta->pid = msg->pid; - lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); - lta->sock = sock; - pthread_mutex_init(<a->sock_lock, NULL); - lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); - - CDS_INIT_LIST_HEAD(<a->teardown_head); - return lta; - -error_free_pipe: - lttng_pipe_destroy(event_notifier_event_source_pipe); - lttng_fd_put(LTTNG_FD_APPS, 2); -error: - return NULL; -} - -/* - * For a given application object, add it to every hash table. - */ -void ust_app_add(struct ust_app *app) -{ - LTTNG_ASSERT(app); - LTTNG_ASSERT(app->notify_sock >= 0); - - app->registration_time = time(NULL); - - rcu_read_lock(); - - /* - * On a re-registration, we want to kick out the previous registration of - * that pid - */ - lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); - - /* - * The socket _should_ be unique until _we_ call close. So, a add_unique - * for the ust_app_ht_by_sock is used which asserts fail if the entry was - * already in the table. - */ - lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); - - /* Add application to the notify socket hash table. */ - lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); - lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); - - DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock =%d name:%s " - "notify_sock =%d (version %d.%d)", app->pid, app->ppid, app->uid, - app->gid, app->sock, app->name, app->notify_sock, app->v_major, - app->v_minor); - - rcu_read_unlock(); -} - -/* - * Set the application version into the object. - * - * Return 0 on success else a negative value either an errno code or a - * LTTng-UST error code. - */ -int ust_app_version(struct ust_app *app) -{ - int ret; - - LTTNG_ASSERT(app); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_tracer_version(app->sock, &app->version); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -LTTNG_UST_ERR_EXITING || ret == -EPIPE) { - DBG3("UST app version failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app version failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app version failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - - return ret; -} - -bool ust_app_supports_notifiers(const struct ust_app *app) -{ - return app->v_major >= 9; -} - -bool ust_app_supports_counters(const struct ust_app *app) -{ - return app->v_major >= 9; -} - -/* - * Setup the base event notifier group. - * - * Return 0 on success else a negative value either an errno code or a - * LTTng-UST error code. - */ -int ust_app_setup_event_notifier_group(struct ust_app *app) -{ - int ret; - int event_pipe_write_fd; - struct lttng_ust_abi_object_data *event_notifier_group = NULL; - enum lttng_error_code lttng_ret; - enum event_notifier_error_accounting_status event_notifier_error_accounting_status; - - LTTNG_ASSERT(app); - - if (!ust_app_supports_notifiers(app)) { - ret = -ENOSYS; - goto error; - } - - /* Get the write side of the pipe. */ - event_pipe_write_fd = lttng_pipe_get_writefd( - app->event_notifier_group.event_pipe); - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_create_event_notifier_group(app->sock, - event_pipe_write_fd, &event_notifier_group); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - ret = 0; - DBG3("UST app create event notifier group failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - ret = 0; - WARN("UST app create event notifier group failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app create event notifier group failed with ret %d: pid = %d, sock = %d, event_pipe_write_fd: %d", - ret, app->pid, app->sock, event_pipe_write_fd); - } - goto error; - } - - ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); - if (ret) { - ERR("Failed to close write end of the application's event source pipe: app = '%s' (pid = %d)", - app->name, app->pid); - goto error; - } - - /* - * Release the file descriptor that was reserved for the write-end of - * the pipe. - */ - lttng_fd_put(LTTNG_FD_APPS, 1); - - lttng_ret = notification_thread_command_add_tracer_event_source( - the_notification_thread_handle, - lttng_pipe_get_readfd( - app->event_notifier_group.event_pipe), - LTTNG_DOMAIN_UST); - if (lttng_ret != LTTNG_OK) { - ERR("Failed to add tracer event source to notification thread"); - ret = - 1; - goto error; - } - - /* Assign handle only when the complete setup is valid. */ - app->event_notifier_group.object = event_notifier_group; - - event_notifier_error_accounting_status = - event_notifier_error_accounting_register_app(app); - switch (event_notifier_error_accounting_status) { - case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK: - break; - case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_UNSUPPORTED: - DBG3("Failed to setup event notifier error accounting (application does not support notifier error accounting): app socket fd = %d, app name = '%s', app pid = %d", - app->sock, app->name, (int) app->pid); - ret = 0; - goto error_accounting; - case EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_APP_DEAD: - DBG3("Failed to setup event notifier error accounting (application is dead): app socket fd = %d, app name = '%s', app pid = %d", - app->sock, app->name, (int) app->pid); - ret = 0; - goto error_accounting; - default: - ERR("Failed to setup event notifier error accounting for app"); - ret = -1; - goto error_accounting; - } - - return ret; - -error_accounting: - lttng_ret = notification_thread_command_remove_tracer_event_source( - the_notification_thread_handle, - lttng_pipe_get_readfd( - app->event_notifier_group.event_pipe)); - if (lttng_ret != LTTNG_OK) { - ERR("Failed to remove application tracer event source from notification thread"); - } - -error: - lttng_ust_ctl_release_object(app->sock, app->event_notifier_group.object); - free(app->event_notifier_group.object); - app->event_notifier_group.object = NULL; - return ret; -} - -/* - * Unregister app by removing it from the global traceable app list and freeing - * the data struct. - * - * The socket is already closed at this point so no close to sock. - */ -void ust_app_unregister(int sock) -{ - struct ust_app *lta; - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter ust_app_sock_iter; - struct lttng_ht_iter iter; - struct ust_app_session *ua_sess; - int ret; - - rcu_read_lock(); - - /* Get the node reference for a call_rcu */ - lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); - node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); - LTTNG_ASSERT(node); - - lta = caa_container_of(node, struct ust_app, sock_n); - DBG("PID %d unregistering with sock %d", lta->pid, sock); - - /* - * For per-PID buffers, perform "push metadata" and flush all - * application streams before removing app from hash tables, - * ensuring proper behavior of data_pending check. - * Remove sessions so they are not visible during deletion. - */ - cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, - node.node) { - struct ust_registry_session *registry; - - ret = lttng_ht_del(lta->sessions, &iter); - if (ret) { - /* The session was already removed so scheduled for teardown. */ - continue; - } - - if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { - (void) ust_app_flush_app_session(lta, ua_sess); - } - - /* - * Add session to list for teardown. This is safe since at this point we - * are the only one using this list. - */ - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - continue; - } - - /* - * Normally, this is done in the delete session process which is - * executed in the call rcu below. However, upon registration we can't - * afford to wait for the grace period before pushing data or else the - * data pending feature can race between the unregistration and stop - * command where the data pending command is sent *before* the grace - * period ended. - * - * The close metadata below nullifies the metadata pointer in the - * session so the delete session will NOT push/close a second time. - */ - registry = get_session_registry(ua_sess); - if (registry) { - /* Push metadata for application before freeing the application. */ - (void) push_metadata(registry, ua_sess->consumer); - - /* - * Don't ask to close metadata for global per UID buffers. Close - * metadata only on destroy trace session in this case. Also, the - * previous push metadata could have flag the metadata registry to - * close so don't send a close command if closed. - */ - if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { - /* And ask to close it for this session registry. */ - (void) close_metadata(registry, ua_sess->consumer); - } - } - cds_list_add(&ua_sess->teardown_node, <a->teardown_head); - - pthread_mutex_unlock(&ua_sess->lock); - } - - /* Remove application from PID hash table */ - ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); - LTTNG_ASSERT(!ret); - - /* - * Remove application from notify hash table. The thread handling the - * notify socket could have deleted the node so ignore on error because - * either way it's valid. The close of that socket is handled by the - * apps_notify_thread. - */ - iter.iter.node = <a->notify_sock_n.node; - (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); - - /* - * Ignore return value since the node might have been removed before by an - * add replace during app registration because the PID can be reassigned by - * the OS. - */ - iter.iter.node = <a->pid_n.node; - ret = lttng_ht_del(ust_app_ht, &iter); - if (ret) { - DBG3("Unregister app by PID %d failed. This can happen on pid reuse", - lta->pid); - } - - /* Free memory */ - call_rcu(<a->pid_n.head, delete_ust_app_rcu); - - rcu_read_unlock(); - return; -} - -/* - * Fill events array with all events name of all registered apps. - */ -int ust_app_list_events(struct lttng_event **events) -{ - int ret, handle; - size_t nbmem, count = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - struct lttng_event *tmp_event; - - nbmem = UST_APP_EVENT_LIST_SIZE; - tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); - if (tmp_event == NULL) { - PERROR("zmalloc ust app events"); - ret = -ENOMEM; - goto error; - } - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct lttng_ust_abi_tracepoint_iter uiter; - - health_code_update(); - - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - pthread_mutex_lock(&app->sock_lock); - handle = lttng_ust_ctl_tracepoint_list(app->sock); - if (handle < 0) { - if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { - ERR("UST app list events getting handle failed for app pid %d", - app->pid); - } - pthread_mutex_unlock(&app->sock_lock); - continue; - } - - while ((ret = lttng_ust_ctl_tracepoint_list_get(app->sock, handle, - &uiter)) != -LTTNG_UST_ERR_NOENT) { - /* Handle ustctl error. */ - if (ret < 0) { - int release_ret; - - if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { - ERR("UST app tp list get failed for app %d with ret %d", - app->sock, ret); - } else { - DBG3("UST app tp list get failed. Application is dead"); - break; - } - free(tmp_event); - release_ret = lttng_ust_ctl_release_handle(app->sock, handle); - if (release_ret < 0 && - release_ret != -LTTNG_UST_ERR_EXITING && - release_ret != -EPIPE) { - ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); - } - pthread_mutex_unlock(&app->sock_lock); - goto rcu_error; - } - - health_code_update(); - if (count >= nbmem) { - /* In case the realloc fails, we free the memory */ - struct lttng_event *new_tmp_event; - size_t new_nbmem; - - new_nbmem = nbmem << 1; - DBG2("Reallocating event list from %zu to %zu entries", - nbmem, new_nbmem); - new_tmp_event = realloc(tmp_event, - new_nbmem * sizeof(struct lttng_event)); - if (new_tmp_event == NULL) { - int release_ret; - - PERROR("realloc ust app events"); - free(tmp_event); - ret = -ENOMEM; - release_ret = lttng_ust_ctl_release_handle(app->sock, handle); - if (release_ret < 0 && - release_ret != -LTTNG_UST_ERR_EXITING && - release_ret != -EPIPE) { - ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); - } - pthread_mutex_unlock(&app->sock_lock); - goto rcu_error; - } - /* Zero the new memory */ - memset(new_tmp_event + nbmem, 0, - (new_nbmem - nbmem) * sizeof(struct lttng_event)); - nbmem = new_nbmem; - tmp_event = new_tmp_event; - } - memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_ABI_SYM_NAME_LEN); - tmp_event[count].loglevel = uiter.loglevel; - tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_ABI_TRACEPOINT; - tmp_event[count].pid = app->pid; - tmp_event[count].enabled = -1; - count++; - } - ret = lttng_ust_ctl_release_handle(app->sock, handle); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("Error releasing app handle. Application died: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("Error releasing app handle. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("Error releasing app handle with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - } - } - - ret = count; - *events = tmp_event; - - DBG2("UST app list events done (%zu events)", count); - -rcu_error: - rcu_read_unlock(); -error: - health_code_update(); - return ret; -} - -/* - * Fill events array with all events name of all registered apps. - */ -int ust_app_list_event_fields(struct lttng_event_field **fields) -{ - int ret, handle; - size_t nbmem, count = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - struct lttng_event_field *tmp_event; - - nbmem = UST_APP_EVENT_LIST_SIZE; - tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); - if (tmp_event == NULL) { - PERROR("zmalloc ust app event fields"); - ret = -ENOMEM; - goto error; - } - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct lttng_ust_abi_field_iter uiter; - - health_code_update(); - - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - pthread_mutex_lock(&app->sock_lock); - handle = lttng_ust_ctl_tracepoint_field_list(app->sock); - if (handle < 0) { - if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { - ERR("UST app list field getting handle failed for app pid %d", - app->pid); - } - pthread_mutex_unlock(&app->sock_lock); - continue; - } - - while ((ret = lttng_ust_ctl_tracepoint_field_list_get(app->sock, handle, - &uiter)) != -LTTNG_UST_ERR_NOENT) { - /* Handle ustctl error. */ - if (ret < 0) { - int release_ret; - - if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { - ERR("UST app tp list field failed for app %d with ret %d", - app->sock, ret); - } else { - DBG3("UST app tp list field failed. Application is dead"); - break; - } - free(tmp_event); - release_ret = lttng_ust_ctl_release_handle(app->sock, handle); - pthread_mutex_unlock(&app->sock_lock); - if (release_ret < 0 && - release_ret != -LTTNG_UST_ERR_EXITING && - release_ret != -EPIPE) { - ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); - } - goto rcu_error; - } - - health_code_update(); - if (count >= nbmem) { - /* In case the realloc fails, we free the memory */ - struct lttng_event_field *new_tmp_event; - size_t new_nbmem; - - new_nbmem = nbmem << 1; - DBG2("Reallocating event field list from %zu to %zu entries", - nbmem, new_nbmem); - new_tmp_event = realloc(tmp_event, - new_nbmem * sizeof(struct lttng_event_field)); - if (new_tmp_event == NULL) { - int release_ret; - - PERROR("realloc ust app event fields"); - free(tmp_event); - ret = -ENOMEM; - release_ret = lttng_ust_ctl_release_handle(app->sock, handle); - pthread_mutex_unlock(&app->sock_lock); - if (release_ret && - release_ret != -LTTNG_UST_ERR_EXITING && - release_ret != -EPIPE) { - ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); - } - goto rcu_error; - } - /* Zero the new memory */ - memset(new_tmp_event + nbmem, 0, - (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); - nbmem = new_nbmem; - tmp_event = new_tmp_event; - } - - memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_ABI_SYM_NAME_LEN); - /* Mapping between these enums matches 1 to 1. */ - tmp_event[count].type = (enum lttng_event_field_type) uiter.type; - tmp_event[count].nowrite = uiter.nowrite; - - memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_ABI_SYM_NAME_LEN); - tmp_event[count].event.loglevel = uiter.loglevel; - tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; - tmp_event[count].event.pid = app->pid; - tmp_event[count].event.enabled = -1; - count++; - } - ret = lttng_ust_ctl_release_handle(app->sock, handle); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0 && - ret != -LTTNG_UST_ERR_EXITING && - ret != -EPIPE) { - ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); - } - } - - ret = count; - *fields = tmp_event; - - DBG2("UST app list event fields done (%zu events)", count); - -rcu_error: - rcu_read_unlock(); -error: - health_code_update(); - return ret; -} - -/* - * Free and clean all traceable apps of the global list. - * - * Should _NOT_ be called with RCU read-side lock held. - */ -void ust_app_clean_list(void) -{ - int ret; - struct ust_app *app; - struct lttng_ht_iter iter; - - DBG2("UST app cleaning registered apps hash table"); - - rcu_read_lock(); - - /* Cleanup notify socket hash table */ - if (ust_app_ht_by_notify_sock) { - cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, - notify_sock_n.node) { - /* - * Assert that all notifiers are gone as all triggers - * are unregistered prior to this clean-up. - */ - LTTNG_ASSERT(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); - - ust_app_notify_sock_unregister(app->notify_sock); - } - } - - if (ust_app_ht) { - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ret = lttng_ht_del(ust_app_ht, &iter); - LTTNG_ASSERT(!ret); - call_rcu(&app->pid_n.head, delete_ust_app_rcu); - } - } - - /* Cleanup socket hash table */ - if (ust_app_ht_by_sock) { - cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, - sock_n.node) { - ret = lttng_ht_del(ust_app_ht_by_sock, &iter); - LTTNG_ASSERT(!ret); - } - } - - rcu_read_unlock(); - - /* Destroy is done only when the ht is empty */ - if (ust_app_ht) { - ht_cleanup_push(ust_app_ht); - } - if (ust_app_ht_by_sock) { - ht_cleanup_push(ust_app_ht_by_sock); - } - if (ust_app_ht_by_notify_sock) { - ht_cleanup_push(ust_app_ht_by_notify_sock); - } -} - -/* - * Init UST app hash table. - */ -int ust_app_ht_alloc(void) -{ - ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - if (!ust_app_ht) { - return -1; - } - ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - if (!ust_app_ht_by_sock) { - return -1; - } - ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - if (!ust_app_ht_by_notify_sock) { - return -1; - } - return 0; -} - -/* - * For a specific UST session, disable the channel for all registered apps. - */ -int ust_app_disable_channel_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - - LTTNG_ASSERT(usess->active); - DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, - uchan->name, usess->id); - - rcu_read_lock(); - - /* For every registered applications */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct lttng_ht_iter uiter; - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - - /* Get channel */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - /* If the session if found for the app, the channel must be there */ - LTTNG_ASSERT(ua_chan_node); - - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - /* The channel must not be already disabled */ - LTTNG_ASSERT(ua_chan->enabled == 1); - - /* Disable channel onto application */ - ret = disable_ust_app_channel(ua_sess, ua_chan, app); - if (ret < 0) { - /* XXX: We might want to report this error at some point... */ - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* - * For a specific UST session, enable the channel for all registered apps. - */ -int ust_app_enable_channel_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - struct ust_app_session *ua_sess; - - LTTNG_ASSERT(usess->active); - DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, - uchan->name, usess->id); - - rcu_read_lock(); - - /* For every registered applications */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - - /* Enable channel onto application */ - ret = enable_ust_app_channel(ua_sess, uchan, app); - if (ret < 0) { - /* XXX: We might want to report this error at some point... */ - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* - * Disable an event in a channel and for a specific session. - */ -int ust_app_disable_event_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) -{ - int ret = 0; - struct lttng_ht_iter iter, uiter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - struct ust_app_event *ua_event; - - LTTNG_ASSERT(usess->active); - DBG("UST app disabling event %s for all apps in channel " - "%s for session id %" PRIu64, - uevent->attr.name, uchan->name, usess->id); - - rcu_read_lock(); - - /* For all registered applications */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - /* Next app */ - continue; - } - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_chan_node == NULL) { - DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." - "Skipping", uchan->name, usess->id, app->pid); - continue; - } - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - - ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, - uevent->filter, uevent->attr.loglevel, - uevent->exclusion); - if (ua_event == NULL) { - DBG2("Event %s not found in channel %s for app pid %d." - "Skipping", uevent->attr.name, uchan->name, app->pid); - continue; - } - - ret = disable_ust_app_event(ua_sess, ua_event, app); - if (ret < 0) { - /* XXX: Report error someday... */ - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* The ua_sess lock must be held by the caller. */ -static -int ust_app_channel_create(struct ltt_ust_session *usess, - struct ust_app_session *ua_sess, - struct ltt_ust_channel *uchan, struct ust_app *app, - struct ust_app_channel **_ua_chan) -{ - int ret = 0; - struct ust_app_channel *ua_chan = NULL; - - LTTNG_ASSERT(ua_sess); - ASSERT_LOCKED(ua_sess->lock); - - if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, - sizeof(uchan->name))) { - copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, - &uchan->attr); - ret = 0; - } else { - struct ltt_ust_context *uctx = NULL; - - /* - * Create channel onto application and synchronize its - * configuration. - */ - ret = ust_app_channel_allocate(ua_sess, uchan, - LTTNG_UST_ABI_CHAN_PER_CPU, usess, - &ua_chan); - if (ret < 0) { - goto error; - } - - ret = ust_app_channel_send(app, usess, - ua_sess, ua_chan); - if (ret) { - goto error; - } - - /* Add contexts. */ - cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { - ret = create_ust_app_channel_context(ua_chan, - &uctx->ctx, app); - if (ret) { - goto error; - } - } - } - -error: - if (ret < 0) { - switch (ret) { - case -ENOTCONN: - /* - * The application's socket is not valid. Either a bad socket - * or a timeout on it. We can't inform the caller that for a - * specific app, the session failed so lets continue here. - */ - ret = 0; /* Not an error. */ - break; - case -ENOMEM: - default: - break; - } - } - - if (ret == 0 && _ua_chan) { - /* - * Only return the application's channel on success. Note - * that the channel can still be part of the application's - * channel hashtable on error. - */ - *_ua_chan = ua_chan; - } - return ret; -} - -/* - * Enable event for a specific session and channel on the tracer. - */ -int ust_app_enable_event_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) -{ - int ret = 0; - struct lttng_ht_iter iter, uiter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - struct ust_app_event *ua_event; - - LTTNG_ASSERT(usess->active); - DBG("UST app enabling event %s for all apps for session id %" PRIu64, - uevent->attr.name, usess->id); - - /* - * NOTE: At this point, this function is called only if the session and - * channel passed are already created for all apps. and enabled on the - * tracer also. - */ - - rcu_read_lock(); - - /* For all registered applications */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* The application has problem or is probably dead. */ - continue; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - continue; - } - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - /* - * It is possible that the channel cannot be found is - * the channel/event creation occurs concurrently with - * an application exit. - */ - if (!ua_chan_node) { - pthread_mutex_unlock(&ua_sess->lock); - continue; - } - - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - - /* Get event node */ - ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, - uevent->filter, uevent->attr.loglevel, uevent->exclusion); - if (ua_event == NULL) { - DBG3("UST app enable event %s not found for app PID %d." - "Skipping app", uevent->attr.name, app->pid); - goto next_app; - } - - ret = enable_ust_app_event(ua_sess, ua_event, app); - if (ret < 0) { - pthread_mutex_unlock(&ua_sess->lock); - goto error; - } - next_app: - pthread_mutex_unlock(&ua_sess->lock); - } - -error: - rcu_read_unlock(); - return ret; -} - -/* - * For a specific existing UST session and UST channel, creates the event for - * all registered apps. - */ -int ust_app_create_event_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) -{ - int ret = 0; - struct lttng_ht_iter iter, uiter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - - LTTNG_ASSERT(usess->active); - DBG("UST app creating event %s for all apps for session id %" PRIu64, - uevent->attr.name, usess->id); - - rcu_read_lock(); - - /* For all registered applications */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* The application has problem or is probably dead. */ - continue; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - continue; - } - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - /* If the channel is not found, there is a code flow error */ - LTTNG_ASSERT(ua_chan_node); - - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - - ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); - pthread_mutex_unlock(&ua_sess->lock); - if (ret < 0) { - if (ret != -LTTNG_UST_ERR_EXIST) { - /* Possible value at this point: -ENOMEM. If so, we stop! */ - break; - } - DBG2("UST app event %s already exist on app PID %d", - uevent->attr.name, app->pid); - continue; - } - } - - rcu_read_unlock(); - return ret; -} - -/* - * Start tracing for a specific UST session and app. - * - * Called with UST app session lock held. - * - */ -static -int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) -{ - int ret = 0; - struct ust_app_session *ua_sess; - - DBG("Starting tracing for ust app pid %d", app->pid); - - rcu_read_lock(); - - if (!app->compatible) { - goto end; - } - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - /* The session is in teardown process. Ignore and continue. */ - goto end; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - goto end; - } - - if (ua_sess->enabled) { - pthread_mutex_unlock(&ua_sess->lock); - goto end; - } - - /* Upon restart, we skip the setup, already done */ - if (ua_sess->started) { - goto skip_setup; - } - - health_code_update(); - -skip_setup: - /* This starts the UST tracing */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_start_session(app->sock, ua_sess->handle); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app start session failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - pthread_mutex_unlock(&ua_sess->lock); - goto end; - } else if (ret == -EAGAIN) { - WARN("UST app start session failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - pthread_mutex_unlock(&ua_sess->lock); - goto end; - - } else { - ERR("UST app start session failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - goto error_unlock; - } - - /* Indicate that the session has been started once */ - ua_sess->started = 1; - ua_sess->enabled = 1; - - pthread_mutex_unlock(&ua_sess->lock); - - health_code_update(); - - /* Quiescent wait after starting trace */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_wait_quiescent(app->sock); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app wait quiescent failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app wait quiescent failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app wait quiescent failed with ret %d: pid %d, sock = %d", - ret, app->pid, app->sock); - } - } - -end: - rcu_read_unlock(); - health_code_update(); - return 0; - -error_unlock: - pthread_mutex_unlock(&ua_sess->lock); - rcu_read_unlock(); - health_code_update(); - return -1; -} - -/* - * Stop tracing for a specific UST session and app. - */ -static -int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) -{ - int ret = 0; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - DBG("Stopping tracing for ust app pid %d", app->pid); - - rcu_read_lock(); - - if (!app->compatible) { - goto end_no_session; - } - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - goto end_no_session; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - goto end_no_session; - } - - /* - * If started = 0, it means that stop trace has been called for a session - * that was never started. It's possible since we can have a fail start - * from either the application manager thread or the command thread. Simply - * indicate that this is a stop error. - */ - if (!ua_sess->started) { - goto error_rcu_unlock; - } - - health_code_update(); - - /* This inhibits UST tracing */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_stop_session(app->sock, ua_sess->handle); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app stop session failed. Application is dead: pid = %d, sock = %d", - app->pid, app->sock); - goto end_unlock; - } else if (ret == -EAGAIN) { - WARN("UST app stop session failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - goto end_unlock; - - } else { - ERR("UST app stop session failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - goto error_rcu_unlock; - } - - health_code_update(); - ua_sess->enabled = 0; - - /* Quiescent wait after stopping trace */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_wait_quiescent(app->sock); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d)", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d)", - app->pid, app->sock); - } else { - ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d)", - ret, app->pid, app->sock); - } - } - - health_code_update(); - - registry = get_session_registry(ua_sess); - - /* The UST app session is held registry shall not be null. */ - LTTNG_ASSERT(registry); - - /* Push metadata for application before freeing the application. */ - (void) push_metadata(registry, ua_sess->consumer); - -end_unlock: - pthread_mutex_unlock(&ua_sess->lock); -end_no_session: - rcu_read_unlock(); - health_code_update(); - return 0; - -error_rcu_unlock: - pthread_mutex_unlock(&ua_sess->lock); - rcu_read_unlock(); - health_code_update(); - return -1; -} - -static -int ust_app_flush_app_session(struct ust_app *app, - struct ust_app_session *ua_sess) -{ - int ret, retval = 0; - struct lttng_ht_iter iter; - struct ust_app_channel *ua_chan; - struct consumer_socket *socket; - - DBG("Flushing app session buffers for ust app pid %d", app->pid); - - rcu_read_lock(); - - if (!app->compatible) { - goto end_not_compatible; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - goto end_deleted; - } - - health_code_update(); - - /* Flushing buffers */ - socket = consumer_find_socket_by_bitness(app->bits_per_long, - ua_sess->consumer); - - /* Flush buffers and push metadata. */ - switch (ua_sess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, - node.node) { - health_code_update(); - ret = consumer_flush_channel(socket, ua_chan->key); - if (ret) { - ERR("Error flushing consumer channel"); - retval = -1; - continue; - } - } - break; - case LTTNG_BUFFER_PER_UID: - default: - abort(); - break; - } - - health_code_update(); - -end_deleted: - pthread_mutex_unlock(&ua_sess->lock); - -end_not_compatible: - rcu_read_unlock(); - health_code_update(); - return retval; -} - -/* - * Flush buffers for all applications for a specific UST session. - * Called with UST session lock held. - */ -static -int ust_app_flush_session(struct ltt_ust_session *usess) - -{ - int ret = 0; - - DBG("Flushing session buffers for all ust apps"); - - rcu_read_lock(); - - /* Flush buffers and push metadata. */ - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - struct lttng_ht_iter iter; - - /* Flush all per UID buffers associated to that session. */ - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct ust_registry_session *ust_session_reg; - struct buffer_reg_channel *buf_reg_chan; - struct consumer_socket *socket; - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(reg->bits_per_long, - usess->consumer); - if (!socket) { - /* Ignore request if no consumer is found for the session. */ - continue; - } - - cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, - buf_reg_chan, node.node) { - /* - * The following call will print error values so the return - * code is of little importance because whatever happens, we - * have to try them all. - */ - (void) consumer_flush_channel(socket, buf_reg_chan->consumer_key); - } - - ust_session_reg = reg->registry->reg.ust; - /* Push metadata. */ - (void) push_metadata(ust_session_reg, usess->consumer); - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - struct ust_app_session *ua_sess; - struct lttng_ht_iter iter; - struct ust_app *app; - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - (void) ust_app_flush_app_session(app, ua_sess); - } - break; - } - default: - ret = -1; - abort(); - break; - } - - rcu_read_unlock(); - health_code_update(); - return ret; -} - -static -int ust_app_clear_quiescent_app_session(struct ust_app *app, - struct ust_app_session *ua_sess) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct ust_app_channel *ua_chan; - struct consumer_socket *socket; - - DBG("Clearing stream quiescent state for ust app pid %d", app->pid); - - rcu_read_lock(); - - if (!app->compatible) { - goto end_not_compatible; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - goto end_unlock; - } - - health_code_update(); - - socket = consumer_find_socket_by_bitness(app->bits_per_long, - ua_sess->consumer); - if (!socket) { - ERR("Failed to find consumer (%" PRIu32 ") socket", - app->bits_per_long); - ret = -1; - goto end_unlock; - } - - /* Clear quiescent state. */ - switch (ua_sess->buffer_type) { - case LTTNG_BUFFER_PER_PID: - cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, - ua_chan, node.node) { - health_code_update(); - ret = consumer_clear_quiescent_channel(socket, - ua_chan->key); - if (ret) { - ERR("Error clearing quiescent state for consumer channel"); - ret = -1; - continue; - } - } - break; - case LTTNG_BUFFER_PER_UID: - default: - abort(); - ret = -1; - break; - } - - health_code_update(); - -end_unlock: - pthread_mutex_unlock(&ua_sess->lock); - -end_not_compatible: - rcu_read_unlock(); - health_code_update(); - return ret; -} - -/* - * Clear quiescent state in each stream for all applications for a - * specific UST session. - * Called with UST session lock held. - */ -static -int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) - -{ - int ret = 0; - - DBG("Clearing stream quiescent state for all ust apps"); - - rcu_read_lock(); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct lttng_ht_iter iter; - struct buffer_reg_uid *reg; - - /* - * Clear quiescent for all per UID buffers associated to - * that session. - */ - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct consumer_socket *socket; - struct buffer_reg_channel *buf_reg_chan; - - /* Get associated consumer socket.*/ - socket = consumer_find_socket_by_bitness( - reg->bits_per_long, usess->consumer); - if (!socket) { - /* - * Ignore request if no consumer is found for - * the session. - */ - continue; - } - - cds_lfht_for_each_entry(reg->registry->channels->ht, - &iter.iter, buf_reg_chan, node.node) { - /* - * The following call will print error values so - * the return code is of little importance - * because whatever happens, we have to try them - * all. - */ - (void) consumer_clear_quiescent_channel(socket, - buf_reg_chan->consumer_key); - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - struct ust_app_session *ua_sess; - struct lttng_ht_iter iter; - struct ust_app *app; - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, - pid_n.node) { - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - (void) ust_app_clear_quiescent_app_session(app, - ua_sess); - } - break; - } - default: - ret = -1; - abort(); - break; - } - - rcu_read_unlock(); - health_code_update(); - return ret; -} - -/* - * Destroy a specific UST session in apps. - */ -static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) -{ - int ret; - struct ust_app_session *ua_sess; - struct lttng_ht_iter iter; - struct lttng_ht_node_u64 *node; - - DBG("Destroy tracing for ust app pid %d", app->pid); - - rcu_read_lock(); - - if (!app->compatible) { - goto end; - } - - __lookup_session_by_app(usess, app, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node == NULL) { - /* Session is being or is deleted. */ - goto end; - } - ua_sess = caa_container_of(node, struct ust_app_session, node); - - health_code_update(); - destroy_app_session(app, ua_sess); - - health_code_update(); - - /* Quiescent wait after stopping trace */ - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_wait_quiescent(app->sock); - pthread_mutex_unlock(&app->sock_lock); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app wait quiescent failed. Application is dead: pid= %d, sock = %d)", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app wait quiescent failed. Communication time out: pid= %d, sock = %d)", - app->pid, app->sock); - } else { - ERR("UST app wait quiescent failed with ret %d: pid= %d, sock = %d)", - ret, app->pid, app->sock); - } - } -end: - rcu_read_unlock(); - health_code_update(); - return 0; -} - -/* - * Start tracing for the UST session. - */ -int ust_app_start_trace_all(struct ltt_ust_session *usess) -{ - struct lttng_ht_iter iter; - struct ust_app *app; - - DBG("Starting all UST traces"); - - /* - * Even though the start trace might fail, flag this session active so - * other application coming in are started by default. - */ - usess->active = 1; - - rcu_read_lock(); - - /* - * In a start-stop-start use-case, we need to clear the quiescent state - * of each channel set by the prior stop command, thus ensuring that a - * following stop or destroy is sure to grab a timestamp_end near those - * operations, even if the packet is empty. - */ - (void) ust_app_clear_quiescent_session(usess); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ust_app_global_update(usess, app); - } - - rcu_read_unlock(); - - return 0; -} - -/* - * Start tracing for the UST session. - * Called with UST session lock held. - */ -int ust_app_stop_trace_all(struct ltt_ust_session *usess) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - - DBG("Stopping all UST traces"); - - /* - * Even though the stop trace might fail, flag this session inactive so - * other application coming in are not started by default. - */ - usess->active = 0; - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ret = ust_app_stop_trace(usess, app); - if (ret < 0) { - /* Continue to next apps even on error */ - continue; - } - } - - (void) ust_app_flush_session(usess); - - rcu_read_unlock(); - - return 0; -} - -/* - * Destroy app UST session. - */ -int ust_app_destroy_trace_all(struct ltt_ust_session *usess) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - - DBG("Destroy all UST traces"); - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ret = destroy_trace(usess, app); - if (ret < 0) { - /* Continue to next apps even on error */ - continue; - } - } - - rcu_read_unlock(); - - return 0; -} - -/* The ua_sess lock must be held by the caller. */ -static -int find_or_create_ust_app_channel( - struct ltt_ust_session *usess, - struct ust_app_session *ua_sess, - struct ust_app *app, - struct ltt_ust_channel *uchan, - struct ust_app_channel **ua_chan) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node; - - lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); - ua_chan_node = lttng_ht_iter_get_node_str(&iter); - if (ua_chan_node) { - *ua_chan = caa_container_of(ua_chan_node, - struct ust_app_channel, node); - goto end; - } - - ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); - if (ret) { - goto end; - } -end: - return ret; -} - -static -int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, - struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_event *ua_event = NULL; - - ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, - uevent->filter, uevent->attr.loglevel, uevent->exclusion); - if (!ua_event) { - ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); - if (ret < 0) { - goto end; - } - } else { - if (ua_event->enabled != uevent->enabled) { - ret = uevent->enabled ? - enable_ust_app_event(ua_sess, ua_event, app) : - disable_ust_app_event(ua_sess, ua_event, app); - } - } - -end: - return ret; -} - -/* Called with RCU read-side lock held. */ -static -void ust_app_synchronize_event_notifier_rules(struct ust_app *app) -{ - int ret = 0; - enum lttng_error_code ret_code; - enum lttng_trigger_status t_status; - struct lttng_ht_iter app_trigger_iter; - struct lttng_triggers *triggers = NULL; - struct ust_app_event_notifier_rule *event_notifier_rule; - unsigned int count, i; - - if (!ust_app_supports_notifiers(app)) { - goto end; - } - - /* - * Currrently, registering or unregistering a trigger with an - * event rule condition causes a full synchronization of the event - * notifiers. - * - * The first step attempts to add an event notifier for all registered - * triggers that apply to the user space tracers. Then, the - * application's event notifiers rules are all checked against the list - * of registered triggers. Any event notifier that doesn't have a - * matching trigger can be assumed to have been disabled. - * - * All of this is inefficient, but is put in place to get the feature - * rolling as it is simpler at this moment. It will be optimized Soon™ - * to allow the state of enabled - * event notifiers to be synchronized in a piece-wise way. - */ - - /* Get all triggers using uid 0 (root) */ - ret_code = notification_thread_command_list_triggers( - the_notification_thread_handle, 0, &triggers); - if (ret_code != LTTNG_OK) { - goto end; - } - - LTTNG_ASSERT(triggers); - - t_status = lttng_triggers_get_count(triggers, &count); - if (t_status != LTTNG_TRIGGER_STATUS_OK) { - goto end; - } - - for (i = 0; i < count; i++) { - struct lttng_condition *condition; - struct lttng_event_rule *event_rule; - struct lttng_trigger *trigger; - const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; - enum lttng_condition_status condition_status; - uint64_t token; - - trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); - LTTNG_ASSERT(trigger); - - token = lttng_trigger_get_tracer_token(trigger); - condition = lttng_trigger_get_condition(trigger); - - if (lttng_condition_get_type(condition) != - LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES) { - /* Does not apply */ - continue; - } - - condition_status = - lttng_condition_event_rule_matches_borrow_rule_mutable( - condition, &event_rule); - LTTNG_ASSERT(condition_status == LTTNG_CONDITION_STATUS_OK); - - if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { - /* Skip kernel related triggers. */ - continue; - } - - /* - * Find or create the associated token event rule. The caller - * holds the RCU read lock, so this is safe to call without - * explicitly acquiring it here. - */ - looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( - app->token_to_event_notifier_rule_ht, token); - if (!looked_up_event_notifier_rule) { - ret = create_ust_app_event_notifier_rule(trigger, app); - if (ret < 0) { - goto end; - } - } - } - - rcu_read_lock(); - /* Remove all unknown event sources from the app. */ - cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, - &app_trigger_iter.iter, event_notifier_rule, - node.node) { - const uint64_t app_token = event_notifier_rule->token; - bool found = false; - - /* - * Check if the app event trigger still exists on the - * notification side. - */ - for (i = 0; i < count; i++) { - uint64_t notification_thread_token; - const struct lttng_trigger *trigger = - lttng_triggers_get_at_index( - triggers, i); - - LTTNG_ASSERT(trigger); - - notification_thread_token = - lttng_trigger_get_tracer_token(trigger); - - if (notification_thread_token == app_token) { - found = true; - break; - } - } - - if (found) { - /* Still valid. */ - continue; - } - - /* - * This trigger was unregistered, disable it on the tracer's - * side. - */ - ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, - &app_trigger_iter); - LTTNG_ASSERT(ret == 0); - - /* Callee logs errors. */ - (void) disable_ust_object(app, event_notifier_rule->obj); - - delete_ust_app_event_notifier_rule( - app->sock, event_notifier_rule, app); - } - - rcu_read_unlock(); - -end: - lttng_triggers_destroy(triggers); - return; -} - -/* - * RCU read lock must be held by the caller. - */ -static -void ust_app_synchronize_all_channels(struct ltt_ust_session *usess, - struct ust_app_session *ua_sess, - struct ust_app *app) -{ - int ret = 0; - struct cds_lfht_iter uchan_iter; - struct ltt_ust_channel *uchan; - - LTTNG_ASSERT(usess); - LTTNG_ASSERT(ua_sess); - LTTNG_ASSERT(app); - - cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, - uchan, node.node) { - struct ust_app_channel *ua_chan; - struct cds_lfht_iter uevent_iter; - struct ltt_ust_event *uevent; - - /* - * Search for a matching ust_app_channel. If none is found, - * create it. Creating the channel will cause the ua_chan - * structure to be allocated, the channel buffers to be - * allocated (if necessary) and sent to the application, and - * all enabled contexts will be added to the channel. - */ - ret = find_or_create_ust_app_channel(usess, ua_sess, - app, uchan, &ua_chan); - if (ret) { - /* Tracer is probably gone or ENOMEM. */ - goto end; - } - - if (!ua_chan) { - /* ua_chan will be NULL for the metadata channel */ - continue; - } - - cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, - node.node) { - ret = ust_app_channel_synchronize_event(ua_chan, - uevent, ua_sess, app); - if (ret) { - goto end; - } - } - - if (ua_chan->enabled != uchan->enabled) { - ret = uchan->enabled ? - enable_ust_app_channel(ua_sess, uchan, app) : - disable_ust_app_channel(ua_sess, ua_chan, app); - if (ret) { - goto end; - } - } - } -end: - return; -} - -/* - * The caller must ensure that the application is compatible and is tracked - * by the process attribute trackers. - */ -static -void ust_app_synchronize(struct ltt_ust_session *usess, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_session *ua_sess = NULL; - - /* - * The application's configuration should only be synchronized for - * active sessions. - */ - LTTNG_ASSERT(usess->active); - - ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); - if (ret < 0) { - /* Tracer is probably gone or ENOMEM. */ - if (ua_sess) { - destroy_app_session(app, ua_sess); - } - goto end; - } - LTTNG_ASSERT(ua_sess); - - pthread_mutex_lock(&ua_sess->lock); - if (ua_sess->deleted) { - goto deleted_session; - } - - rcu_read_lock(); - - ust_app_synchronize_all_channels(usess, ua_sess, app); - - /* - * Create the metadata for the application. This returns gracefully if a - * metadata was already set for the session. - * - * The metadata channel must be created after the data channels as the - * consumer daemon assumes this ordering. When interacting with a relay - * daemon, the consumer will use this assumption to send the - * "STREAMS_SENT" message to the relay daemon. - */ - ret = create_ust_app_metadata(ua_sess, app, usess->consumer); - if (ret < 0) { - ERR("Metadata creation failed for app sock %d for session id %" PRIu64, - app->sock, usess->id); - } - - rcu_read_unlock(); - -deleted_session: - pthread_mutex_unlock(&ua_sess->lock); -end: - return; -} - -static -void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) -{ - struct ust_app_session *ua_sess; - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - return; - } - destroy_app_session(app, ua_sess); -} - -/* - * Add channels/events from UST global domain to registered apps at sock. - * - * Called with session lock held. - * Called with RCU read-side lock held. - */ -void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) -{ - LTTNG_ASSERT(usess); - LTTNG_ASSERT(usess->active); - - DBG2("UST app global update for app sock %d for session id %" PRIu64, - app->sock, usess->id); - - if (!app->compatible) { - return; - } - if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, - usess, app->pid) && - trace_ust_id_tracker_lookup( - LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, - usess, app->uid) && - trace_ust_id_tracker_lookup( - LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, - usess, app->gid)) { - /* - * Synchronize the application's internal tracing configuration - * and start tracing. - */ - ust_app_synchronize(usess, app); - ust_app_start_trace(usess, app); - } else { - ust_app_global_destroy(usess, app); - } -} - -/* - * Add all event notifiers to an application. - * - * Called with session lock held. - * Called with RCU read-side lock held. - */ -void ust_app_global_update_event_notifier_rules(struct ust_app *app) -{ - DBG2("UST application global event notifier rules update: app = '%s', pid = %d)", - app->name, app->pid); - - if (!app->compatible || !ust_app_supports_notifiers(app)) { - return; - } - - if (app->event_notifier_group.object == NULL) { - WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' pid = %d)", - app->name, app->pid); - return; - } - - ust_app_synchronize_event_notifier_rules(app); -} - -/* - * Called with session lock held. - */ -void ust_app_global_update_all(struct ltt_ust_session *usess) -{ - struct lttng_ht_iter iter; - struct ust_app *app; - - rcu_read_lock(); - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ust_app_global_update(usess, app); - } - rcu_read_unlock(); -} - -void ust_app_global_update_all_event_notifier_rules(void) -{ - struct lttng_ht_iter iter; - struct ust_app *app; - - rcu_read_lock(); - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - ust_app_global_update_event_notifier_rules(app); - } - - rcu_read_unlock(); -} - -/* - * Add context to a specific channel for global UST domain. - */ -int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) -{ - int ret = 0; - struct lttng_ht_node_str *ua_chan_node; - struct lttng_ht_iter iter, uiter; - struct ust_app_channel *ua_chan = NULL; - struct ust_app_session *ua_sess; - struct ust_app *app; - - LTTNG_ASSERT(usess->active); - - rcu_read_lock(); - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - /* - * TODO: In time, we should notice the caller of this error by - * telling him that this is a version error. - */ - continue; - } - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - pthread_mutex_unlock(&ua_sess->lock); - continue; - } - - /* Lookup channel in the ust app session */ - lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - if (ua_chan_node == NULL) { - goto next_app; - } - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, - node); - ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); - if (ret < 0) { - goto next_app; - } - next_app: - pthread_mutex_unlock(&ua_sess->lock); - } - - rcu_read_unlock(); - return ret; -} - -/* - * Receive registration and populate the given msg structure. - * - * On success return 0 else a negative value returned by the ustctl call. - */ -int ust_app_recv_registration(int sock, struct ust_register_msg *msg) -{ - int ret; - uint32_t pid, ppid, uid, gid; - - LTTNG_ASSERT(msg); - - ret = lttng_ust_ctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, - &pid, &ppid, &uid, &gid, - &msg->bits_per_long, - &msg->uint8_t_alignment, - &msg->uint16_t_alignment, - &msg->uint32_t_alignment, - &msg->uint64_t_alignment, - &msg->long_alignment, - &msg->byte_order, - msg->name); - if (ret < 0) { - switch (-ret) { - case EPIPE: - case ECONNRESET: - case LTTNG_UST_ERR_EXITING: - DBG3("UST app recv reg message failed. Application died"); - break; - case LTTNG_UST_ERR_UNSUP_MAJOR: - ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", - msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, - LTTNG_UST_ABI_MINOR_VERSION); - break; - default: - ERR("UST app recv reg message failed with ret %d", ret); - break; - } - goto error; - } - msg->pid = (pid_t) pid; - msg->ppid = (pid_t) ppid; - msg->uid = (uid_t) uid; - msg->gid = (gid_t) gid; - -error: - return ret; -} - -/* - * Return a ust app session object using the application object and the - * session object descriptor has a key. If not found, NULL is returned. - * A RCU read side lock MUST be acquired when calling this function. -*/ -static struct ust_app_session *find_session_by_objd(struct ust_app *app, - int objd) -{ - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - struct ust_app_session *ua_sess = NULL; - - LTTNG_ASSERT(app); - - lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app session find by objd %d not found", objd); - goto error; - } - - ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); - -error: - return ua_sess; -} - -/* - * Return a ust app channel object using the application object and the channel - * object descriptor has a key. If not found, NULL is returned. A RCU read side - * lock MUST be acquired before calling this function. - */ -static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, - int objd) -{ - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - struct ust_app_channel *ua_chan = NULL; - - LTTNG_ASSERT(app); - - lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("UST app channel find by objd %d not found", objd); - goto error; - } - - ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); - -error: - return ua_chan; -} - -/* - * Reply to a register channel notification from an application on the notify - * socket. The channel metadata is also created. - * - * The session UST registry lock is acquired in this function. - * - * On success 0 is returned else a negative value. - */ -static int reply_ust_register_channel(int sock, int cobjd, - size_t nr_fields, struct lttng_ust_ctl_field *fields) -{ - int ret, ret_code = 0; - uint32_t chan_id; - uint64_t chan_reg_key; - enum lttng_ust_ctl_channel_header type; - struct ust_app *app; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - struct ust_registry_channel *ust_reg_chan; - - rcu_read_lock(); - - /* Lookup application. If not found, there is a code flow error. */ - app = find_app_by_notify_sock(sock); - if (!app) { - DBG("Application socket %d is being torn down. Abort event notify", - sock); - ret = -1; - goto error_rcu_unlock; - } - - /* Lookup channel by UST object descriptor. */ - ua_chan = find_channel_by_objd(app, cobjd); - if (!ua_chan) { - DBG("Application channel is being torn down. Abort event notify"); - ret = 0; - goto error_rcu_unlock; - } - - LTTNG_ASSERT(ua_chan->session); - ua_sess = ua_chan->session; - - /* Get right session registry depending on the session buffer type. */ - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Abort event notify"); - ret = 0; - goto error_rcu_unlock; - }; - - /* Depending on the buffer type, a different channel key is used. */ - if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { - chan_reg_key = ua_chan->tracing_channel_id; - } else { - chan_reg_key = ua_chan->key; - } - - pthread_mutex_lock(®istry->lock); - - ust_reg_chan = ust_registry_channel_find(registry, chan_reg_key); - LTTNG_ASSERT(ust_reg_chan); - - if (!ust_reg_chan->register_done) { - /* - * TODO: eventually use the registry event count for - * this channel to better guess header type for per-pid - * buffers. - */ - type = LTTNG_UST_CTL_CHANNEL_HEADER_LARGE; - ust_reg_chan->nr_ctx_fields = nr_fields; - ust_reg_chan->ctx_fields = fields; - fields = NULL; - ust_reg_chan->header_type = type; - } else { - /* Get current already assigned values. */ - type = ust_reg_chan->header_type; - } - /* Channel id is set during the object creation. */ - chan_id = ust_reg_chan->chan_id; - - /* Append to metadata */ - if (!ust_reg_chan->metadata_dumped) { - ret_code = ust_metadata_channel_statedump(registry, ust_reg_chan); - if (ret_code) { - ERR("Error appending channel metadata (errno = %d)", ret_code); - goto reply; - } - } - -reply: - DBG3("UST app replying to register channel key %" PRIu64 - " with id %u, type = %d, ret = %d", chan_reg_key, chan_id, type, - ret_code); - - ret = lttng_ust_ctl_reply_register_channel(sock, chan_id, type, ret_code); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app reply channel failed. Application died: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app reply channel failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app reply channel failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - goto error; - } - - /* This channel registry registration is completed. */ - ust_reg_chan->register_done = 1; - -error: - pthread_mutex_unlock(®istry->lock); -error_rcu_unlock: - rcu_read_unlock(); - free(fields); - return ret; -} - -/* - * Add event to the UST channel registry. When the event is added to the - * registry, the metadata is also created. Once done, this replies to the - * application with the appropriate error code. - * - * The session UST registry lock is acquired in the function. - * - * On success 0 is returned else a negative value. - */ -static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, - char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields, - int loglevel_value, char *model_emf_uri) -{ - int ret, ret_code; - uint32_t event_id = 0; - uint64_t chan_reg_key; - struct ust_app *app; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - rcu_read_lock(); - - /* Lookup application. If not found, there is a code flow error. */ - app = find_app_by_notify_sock(sock); - if (!app) { - DBG("Application socket %d is being torn down. Abort event notify", - sock); - ret = -1; - goto error_rcu_unlock; - } - - /* Lookup channel by UST object descriptor. */ - ua_chan = find_channel_by_objd(app, cobjd); - if (!ua_chan) { - DBG("Application channel is being torn down. Abort event notify"); - ret = 0; - goto error_rcu_unlock; - } - - LTTNG_ASSERT(ua_chan->session); - ua_sess = ua_chan->session; - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Abort event notify"); - ret = 0; - goto error_rcu_unlock; - } - - if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { - chan_reg_key = ua_chan->tracing_channel_id; - } else { - chan_reg_key = ua_chan->key; - } - - pthread_mutex_lock(®istry->lock); - - /* - * From this point on, this call acquires the ownership of the sig, fields - * and model_emf_uri meaning any free are done inside it if needed. These - * three variables MUST NOT be read/write after this. - */ - ret_code = ust_registry_create_event(registry, chan_reg_key, - sobjd, cobjd, name, sig, nr_fields, fields, - loglevel_value, model_emf_uri, ua_sess->buffer_type, - &event_id, app); - sig = NULL; - fields = NULL; - model_emf_uri = NULL; - - /* - * The return value is returned to ustctl so in case of an error, the - * application can be notified. In case of an error, it's important not to - * return a negative error or else the application will get closed. - */ - ret = lttng_ust_ctl_reply_register_event(sock, event_id, ret_code); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app reply event failed. Application died: pid = %d, sock = %d.", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app reply event failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app reply event failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - /* - * No need to wipe the create event since the application socket will - * get close on error hence cleaning up everything by itself. - */ - goto error; - } - - DBG3("UST registry event %s with id %" PRId32 " added successfully", - name, event_id); - -error: - pthread_mutex_unlock(®istry->lock); -error_rcu_unlock: - rcu_read_unlock(); - free(sig); - free(fields); - free(model_emf_uri); - return ret; -} - -/* - * Add enum to the UST session registry. Once done, this replies to the - * application with the appropriate error code. - * - * The session UST registry lock is acquired within this function. - * - * On success 0 is returned else a negative value. - */ -static int add_enum_ust_registry(int sock, int sobjd, char *name, - struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries) -{ - int ret = 0, ret_code; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - uint64_t enum_id = -1ULL; - - rcu_read_lock(); - - /* Lookup application. If not found, there is a code flow error. */ - app = find_app_by_notify_sock(sock); - if (!app) { - /* Return an error since this is not an error */ - DBG("Application socket %d is being torn down. Aborting enum registration", - sock); - free(entries); - ret = -1; - goto error_rcu_unlock; - } - - /* Lookup session by UST object descriptor. */ - ua_sess = find_session_by_objd(app, sobjd); - if (!ua_sess) { - /* Return an error since this is not an error */ - DBG("Application session is being torn down (session not found). Aborting enum registration."); - free(entries); - goto error_rcu_unlock; - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down (registry not found). Aborting enum registration."); - free(entries); - goto error_rcu_unlock; - } - - pthread_mutex_lock(®istry->lock); - - /* - * From this point on, the callee acquires the ownership of - * entries. The variable entries MUST NOT be read/written after - * call. - */ - ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, - entries, nr_entries, &enum_id); - entries = NULL; - - /* - * The return value is returned to ustctl so in case of an error, the - * application can be notified. In case of an error, it's important not to - * return a negative error or else the application will get closed. - */ - ret = lttng_ust_ctl_reply_register_enum(sock, enum_id, ret_code); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app reply enum failed. Application died: pid = %d, sock = %d", - app->pid, app->sock); - } else if (ret == -EAGAIN) { - WARN("UST app reply enum failed. Communication time out: pid = %d, sock = %d", - app->pid, app->sock); - } else { - ERR("UST app reply enum failed with ret %d: pid = %d, sock = %d", - ret, app->pid, app->sock); - } - /* - * No need to wipe the create enum since the application socket will - * get close on error hence cleaning up everything by itself. - */ - goto error; - } - - DBG3("UST registry enum %s added successfully or already found", name); - -error: - pthread_mutex_unlock(®istry->lock); -error_rcu_unlock: - rcu_read_unlock(); - return ret; -} - -/* - * Handle application notification through the given notify socket. - * - * Return 0 on success or else a negative value. - */ -int ust_app_recv_notify(int sock) -{ - int ret; - enum lttng_ust_ctl_notify_cmd cmd; - - DBG3("UST app receiving notify from sock %d", sock); - - ret = lttng_ust_ctl_recv_notify(sock, &cmd); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app recv notify failed. Application died: sock = %d", - sock); - } else if (ret == -EAGAIN) { - WARN("UST app recv notify failed. Communication time out: sock = %d", - sock); - } else { - ERR("UST app recv notify failed with ret %d: sock = %d", - ret, sock); - } - goto error; - } - - switch (cmd) { - case LTTNG_UST_CTL_NOTIFY_CMD_EVENT: - { - int sobjd, cobjd, loglevel_value; - char name[LTTNG_UST_ABI_SYM_NAME_LEN], *sig, *model_emf_uri; - size_t nr_fields; - struct lttng_ust_ctl_field *fields; - - DBG2("UST app ustctl register event received"); - - ret = lttng_ust_ctl_recv_register_event(sock, &sobjd, &cobjd, name, - &loglevel_value, &sig, &nr_fields, &fields, - &model_emf_uri); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app recv event failed. Application died: sock = %d", - sock); - } else if (ret == -EAGAIN) { - WARN("UST app recv event failed. Communication time out: sock = %d", - sock); - } else { - ERR("UST app recv event failed with ret %d: sock = %d", - ret, sock); - } - goto error; - } - - /* - * Add event to the UST registry coming from the notify socket. This - * call will free if needed the sig, fields and model_emf_uri. This - * code path loses the ownsership of these variables and transfer them - * to the this function. - */ - ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, - fields, loglevel_value, model_emf_uri); - if (ret < 0) { - goto error; - } - - break; - } - case LTTNG_UST_CTL_NOTIFY_CMD_CHANNEL: - { - int sobjd, cobjd; - size_t nr_fields; - struct lttng_ust_ctl_field *fields; - - DBG2("UST app ustctl register channel received"); - - ret = lttng_ust_ctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, - &fields); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app recv channel failed. Application died: sock = %d", - sock); - } else if (ret == -EAGAIN) { - WARN("UST app recv channel failed. Communication time out: sock = %d", - sock); - } else { - ERR("UST app recv channel failed with ret %d: sock = %d)", - ret, sock); - } - goto error; - } - - /* - * The fields ownership are transfered to this function call meaning - * that if needed it will be freed. After this, it's invalid to access - * fields or clean it up. - */ - ret = reply_ust_register_channel(sock, cobjd, nr_fields, - fields); - if (ret < 0) { - goto error; - } - - break; - } - case LTTNG_UST_CTL_NOTIFY_CMD_ENUM: - { - int sobjd; - char name[LTTNG_UST_ABI_SYM_NAME_LEN]; - size_t nr_entries; - struct lttng_ust_ctl_enum_entry *entries; - - DBG2("UST app ustctl register enum received"); - - ret = lttng_ust_ctl_recv_register_enum(sock, &sobjd, name, - &entries, &nr_entries); - if (ret < 0) { - if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { - DBG3("UST app recv enum failed. Application died: sock = %d", - sock); - } else if (ret == -EAGAIN) { - WARN("UST app recv enum failed. Communication time out: sock = %d", - sock); - } else { - ERR("UST app recv enum failed with ret %d: sock = %d", - ret, sock); - } - goto error; - } - - /* Callee assumes ownership of entries */ - ret = add_enum_ust_registry(sock, sobjd, name, - entries, nr_entries); - if (ret < 0) { - goto error; - } - - break; - } - default: - /* Should NEVER happen. */ - abort(); - } - -error: - return ret; -} - -/* - * Once the notify socket hangs up, this is called. First, it tries to find the - * corresponding application. On failure, the call_rcu to close the socket is - * executed. If an application is found, it tries to delete it from the notify - * socket hash table. Whathever the result, it proceeds to the call_rcu. - * - * Note that an object needs to be allocated here so on ENOMEM failure, the - * call RCU is not done but the rest of the cleanup is. - */ -void ust_app_notify_sock_unregister(int sock) -{ - int err_enomem = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - struct ust_app_notify_sock_obj *obj; - - LTTNG_ASSERT(sock >= 0); - - rcu_read_lock(); - - obj = zmalloc(sizeof(*obj)); - if (!obj) { - /* - * An ENOMEM is kind of uncool. If this strikes we continue the - * procedure but the call_rcu will not be called. In this case, we - * accept the fd leak rather than possibly creating an unsynchronized - * state between threads. - * - * TODO: The notify object should be created once the notify socket is - * registered and stored independantely from the ust app object. The - * tricky part is to synchronize the teardown of the application and - * this notify object. Let's keep that in mind so we can avoid this - * kind of shenanigans with ENOMEM in the teardown path. - */ - err_enomem = 1; - } else { - obj->fd = sock; - } - - DBG("UST app notify socket unregister %d", sock); - - /* - * Lookup application by notify socket. If this fails, this means that the - * hash table delete has already been done by the application - * unregistration process so we can safely close the notify socket in a - * call RCU. - */ - app = find_app_by_notify_sock(sock); - if (!app) { - goto close_socket; - } - - iter.iter.node = &app->notify_sock_n.node; - - /* - * Whatever happens here either we fail or succeed, in both cases we have - * to close the socket after a grace period to continue to the call RCU - * here. If the deletion is successful, the application is not visible - * anymore by other threads and is it fails it means that it was already - * deleted from the hash table so either way we just have to close the - * socket. - */ - (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); - -close_socket: - rcu_read_unlock(); - - /* - * Close socket after a grace period to avoid for the socket to be reused - * before the application object is freed creating potential race between - * threads trying to add unique in the global hash table. - */ - if (!err_enomem) { - call_rcu(&obj->head, close_notify_sock_rcu); - } -} - -/* - * Destroy a ust app data structure and free its memory. - */ -void ust_app_destroy(struct ust_app *app) -{ - if (!app) { - return; - } - - call_rcu(&app->pid_n.head, delete_ust_app_rcu); -} - -/* - * Take a snapshot for a given UST session. The snapshot is sent to the given - * output. - * - * Returns LTTNG_OK on success or a LTTNG_ERR error code. - */ -enum lttng_error_code ust_app_snapshot_record( - const struct ltt_ust_session *usess, - const struct consumer_output *output, int wait, - uint64_t nb_packets_per_stream) -{ - int ret = 0; - enum lttng_error_code status = LTTNG_OK; - struct lttng_ht_iter iter; - struct ust_app *app; - char *trace_path = NULL; - - LTTNG_ASSERT(usess); - LTTNG_ASSERT(output); - - rcu_read_lock(); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct buffer_reg_channel *buf_reg_chan; - struct consumer_socket *socket; - char pathname[PATH_MAX]; - size_t consumer_path_offset = 0; - - if (!reg->registry->reg.ust->metadata_key) { - /* Skip since no metadata is present */ - continue; - } - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(reg->bits_per_long, - usess->consumer); - if (!socket) { - status = LTTNG_ERR_INVALID; - goto error; - } - - memset(pathname, 0, sizeof(pathname)); - ret = snprintf(pathname, sizeof(pathname), - DEFAULT_UST_TRACE_UID_PATH, - reg->uid, reg->bits_per_long); - if (ret < 0) { - PERROR("snprintf snapshot path"); - status = LTTNG_ERR_INVALID; - goto error; - } - /* Free path allowed on previous iteration. */ - free(trace_path); - trace_path = setup_channel_trace_path(usess->consumer, pathname, - &consumer_path_offset); - if (!trace_path) { - status = LTTNG_ERR_INVALID; - goto error; - } - /* Add the UST default trace dir to path. */ - cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, - buf_reg_chan, node.node) { - status = consumer_snapshot_channel(socket, - buf_reg_chan->consumer_key, - output, 0, usess->uid, - usess->gid, &trace_path[consumer_path_offset], wait, - nb_packets_per_stream); - if (status != LTTNG_OK) { - goto error; - } - } - status = consumer_snapshot_channel(socket, - reg->registry->reg.ust->metadata_key, output, 1, - usess->uid, usess->gid, &trace_path[consumer_path_offset], - wait, 0); - if (status != LTTNG_OK) { - goto error; - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct consumer_socket *socket; - struct lttng_ht_iter chan_iter; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - char pathname[PATH_MAX]; - size_t consumer_path_offset = 0; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness(app->bits_per_long, - output); - if (!socket) { - status = LTTNG_ERR_INVALID; - goto error; - } - - /* Add the UST default trace dir to path. */ - memset(pathname, 0, sizeof(pathname)); - ret = snprintf(pathname, sizeof(pathname), "%s", - ua_sess->path); - if (ret < 0) { - status = LTTNG_ERR_INVALID; - PERROR("snprintf snapshot path"); - goto error; - } - /* Free path allowed on previous iteration. */ - free(trace_path); - trace_path = setup_channel_trace_path(usess->consumer, pathname, - &consumer_path_offset); - if (!trace_path) { - status = LTTNG_ERR_INVALID; - goto error; - } - cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, - ua_chan, node.node) { - status = consumer_snapshot_channel(socket, - ua_chan->key, output, 0, - lttng_credentials_get_uid(&ua_sess->effective_credentials), - lttng_credentials_get_gid(&ua_sess->effective_credentials), - &trace_path[consumer_path_offset], wait, - nb_packets_per_stream); - switch (status) { - case LTTNG_OK: - break; - case LTTNG_ERR_CHAN_NOT_FOUND: - continue; - default: - goto error; - } - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Skip application."); - continue; - } - status = consumer_snapshot_channel(socket, - registry->metadata_key, output, 1, - lttng_credentials_get_uid(&ua_sess->effective_credentials), - lttng_credentials_get_gid(&ua_sess->effective_credentials), - &trace_path[consumer_path_offset], wait, 0); - switch (status) { - case LTTNG_OK: - break; - case LTTNG_ERR_CHAN_NOT_FOUND: - continue; - default: - goto error; - } - } - break; - } - default: - abort(); - break; - } - -error: - free(trace_path); - rcu_read_unlock(); - return status; -} - -/* - * Return the size taken by one more packet per stream. - */ -uint64_t ust_app_get_size_one_more_packet_per_stream( - const struct ltt_ust_session *usess, uint64_t cur_nr_packets) -{ - uint64_t tot_size = 0; - struct ust_app *app; - struct lttng_ht_iter iter; - - LTTNG_ASSERT(usess); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct buffer_reg_channel *buf_reg_chan; - - rcu_read_lock(); - cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, - buf_reg_chan, node.node) { - if (cur_nr_packets >= buf_reg_chan->num_subbuf) { - /* - * Don't take channel into account if we - * already grab all its packets. - */ - continue; - } - tot_size += buf_reg_chan->subbuf_size * buf_reg_chan->stream_count; - } - rcu_read_unlock(); - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - rcu_read_lock(); - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct lttng_ht_iter chan_iter; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, - ua_chan, node.node) { - if (cur_nr_packets >= ua_chan->attr.num_subbuf) { - /* - * Don't take channel into account if we - * already grab all its packets. - */ - continue; - } - tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; - } - } - rcu_read_unlock(); - break; - } - default: - abort(); - break; - } - - return tot_size; -} - -int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, - struct cds_list_head *buffer_reg_uid_list, - struct consumer_output *consumer, uint64_t uchan_id, - int overwrite, uint64_t *discarded, uint64_t *lost) -{ - int ret; - uint64_t consumer_chan_key; - - *discarded = 0; - *lost = 0; - - ret = buffer_reg_uid_consumer_channel_key( - buffer_reg_uid_list, uchan_id, &consumer_chan_key); - if (ret < 0) { - /* Not found */ - ret = 0; - goto end; - } - - if (overwrite) { - ret = consumer_get_lost_packets(ust_session_id, - consumer_chan_key, consumer, lost); - } else { - ret = consumer_get_discarded_events(ust_session_id, - consumer_chan_key, consumer, discarded); - } - -end: - return ret; -} - -int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, - struct ltt_ust_channel *uchan, - struct consumer_output *consumer, int overwrite, - uint64_t *discarded, uint64_t *lost) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct lttng_ht_node_str *ua_chan_node; - struct ust_app *app; - struct ust_app_session *ua_sess; - struct ust_app_channel *ua_chan; - - *discarded = 0; - *lost = 0; - - rcu_read_lock(); - /* - * Iterate over every registered applications. Sum counters for - * all applications containing requested session and channel. - */ - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct lttng_ht_iter uiter; - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - continue; - } - - /* Get channel */ - lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); - ua_chan_node = lttng_ht_iter_get_node_str(&uiter); - /* If the session is found for the app, the channel must be there */ - LTTNG_ASSERT(ua_chan_node); - - ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); - - if (overwrite) { - uint64_t _lost; - - ret = consumer_get_lost_packets(usess->id, ua_chan->key, - consumer, &_lost); - if (ret < 0) { - break; - } - (*lost) += _lost; - } else { - uint64_t _discarded; - - ret = consumer_get_discarded_events(usess->id, - ua_chan->key, consumer, &_discarded); - if (ret < 0) { - break; - } - (*discarded) += _discarded; - } - } - - rcu_read_unlock(); - return ret; -} - -static -int ust_app_regenerate_statedump(struct ltt_ust_session *usess, - struct ust_app *app) -{ - int ret = 0; - struct ust_app_session *ua_sess; - - DBG("Regenerating the metadata for ust app pid %d", app->pid); - - rcu_read_lock(); - - ua_sess = lookup_session_by_app(usess, app); - if (ua_sess == NULL) { - /* The session is in teardown process. Ignore and continue. */ - goto end; - } - - pthread_mutex_lock(&ua_sess->lock); - - if (ua_sess->deleted) { - goto end_unlock; - } - - pthread_mutex_lock(&app->sock_lock); - ret = lttng_ust_ctl_regenerate_statedump(app->sock, ua_sess->handle); - pthread_mutex_unlock(&app->sock_lock); - -end_unlock: - pthread_mutex_unlock(&ua_sess->lock); - -end: - rcu_read_unlock(); - health_code_update(); - return ret; -} - -/* - * Regenerate the statedump for each app in the session. - */ -int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) -{ - int ret = 0; - struct lttng_ht_iter iter; - struct ust_app *app; - - DBG("Regenerating the metadata for all UST apps"); - - rcu_read_lock(); - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - if (!app->compatible) { - continue; - } - - ret = ust_app_regenerate_statedump(usess, app); - if (ret < 0) { - /* Continue to the next app even on error */ - continue; - } - } - - rcu_read_unlock(); - - return 0; -} - -/* - * Rotate all the channels of a session. - * - * Return LTTNG_OK on success or else an LTTng error code. - */ -enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) -{ - int ret; - enum lttng_error_code cmd_ret = LTTNG_OK; - struct lttng_ht_iter iter; - struct ust_app *app; - struct ltt_ust_session *usess = session->ust_session; - - LTTNG_ASSERT(usess); - - rcu_read_lock(); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct buffer_reg_channel *buf_reg_chan; - struct consumer_socket *socket; - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(reg->bits_per_long, - usess->consumer); - if (!socket) { - cmd_ret = LTTNG_ERR_INVALID; - goto error; - } - - /* Rotate the data channels. */ - cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, - buf_reg_chan, node.node) { - ret = consumer_rotate_channel(socket, - buf_reg_chan->consumer_key, - usess->uid, usess->gid, - usess->consumer, - /* is_metadata_channel */ false); - if (ret < 0) { - cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; - goto error; - } - } - - /* - * The metadata channel might not be present. - * - * Consumer stream allocation can be done - * asynchronously and can fail on intermediary - * operations (i.e add context) and lead to data - * channels created with no metadata channel. - */ - if (!reg->registry->reg.ust->metadata_key) { - /* Skip since no metadata is present. */ - continue; - } - - (void) push_metadata(reg->registry->reg.ust, usess->consumer); - - ret = consumer_rotate_channel(socket, - reg->registry->reg.ust->metadata_key, - usess->uid, usess->gid, - usess->consumer, - /* is_metadata_channel */ true); - if (ret < 0) { - cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; - goto error; - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct consumer_socket *socket; - struct lttng_ht_iter chan_iter; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness(app->bits_per_long, - usess->consumer); - if (!socket) { - cmd_ret = LTTNG_ERR_INVALID; - goto error; - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Skip application."); - continue; - } - - /* Rotate the data channels. */ - cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, - ua_chan, node.node) { - ret = consumer_rotate_channel(socket, - ua_chan->key, - lttng_credentials_get_uid(&ua_sess->effective_credentials), - lttng_credentials_get_gid(&ua_sess->effective_credentials), - ua_sess->consumer, - /* is_metadata_channel */ false); - if (ret < 0) { - /* Per-PID buffer and application going away. */ - if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) - continue; - cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; - goto error; - } - } - - /* Rotate the metadata channel. */ - (void) push_metadata(registry, usess->consumer); - ret = consumer_rotate_channel(socket, - registry->metadata_key, - lttng_credentials_get_uid(&ua_sess->effective_credentials), - lttng_credentials_get_gid(&ua_sess->effective_credentials), - ua_sess->consumer, - /* is_metadata_channel */ true); - if (ret < 0) { - /* Per-PID buffer and application going away. */ - if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) - continue; - cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; - goto error; - } - } - break; - } - default: - abort(); - break; - } - - cmd_ret = LTTNG_OK; - -error: - rcu_read_unlock(); - return cmd_ret; -} - -enum lttng_error_code ust_app_create_channel_subdirectories( - const struct ltt_ust_session *usess) -{ - enum lttng_error_code ret = LTTNG_OK; - struct lttng_ht_iter iter; - enum lttng_trace_chunk_status chunk_status; - char *pathname_index; - int fmt_ret; - - LTTNG_ASSERT(usess->current_trace_chunk); - rcu_read_lock(); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - fmt_ret = asprintf(&pathname_index, - DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, - reg->uid, reg->bits_per_long); - if (fmt_ret < 0) { - ERR("Failed to format channel index directory"); - ret = LTTNG_ERR_CREATE_DIR_FAIL; - goto error; - } - - /* - * Create the index subdirectory which will take care - * of implicitly creating the channel's path. - */ - chunk_status = lttng_trace_chunk_create_subdirectory( - usess->current_trace_chunk, - pathname_index); - free(pathname_index); - if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = LTTNG_ERR_CREATE_DIR_FAIL; - goto error; - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - struct ust_app *app; - - /* - * Create the toplevel ust/ directory in case no apps are running. - */ - chunk_status = lttng_trace_chunk_create_subdirectory( - usess->current_trace_chunk, - DEFAULT_UST_TRACE_DIR); - if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = LTTNG_ERR_CREATE_DIR_FAIL; - goto error; - } - - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, - pid_n.node) { - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Skip application."); - continue; - } - - fmt_ret = asprintf(&pathname_index, - DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, - ua_sess->path); - if (fmt_ret < 0) { - ERR("Failed to format channel index directory"); - ret = LTTNG_ERR_CREATE_DIR_FAIL; - goto error; - } - /* - * Create the index subdirectory which will take care - * of implicitly creating the channel's path. - */ - chunk_status = lttng_trace_chunk_create_subdirectory( - usess->current_trace_chunk, - pathname_index); - free(pathname_index); - if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { - ret = LTTNG_ERR_CREATE_DIR_FAIL; - goto error; - } - } - break; - } - default: - abort(); - } - - ret = LTTNG_OK; -error: - rcu_read_unlock(); - return ret; -} - -/* - * Clear all the channels of a session. - * - * Return LTTNG_OK on success or else an LTTng error code. - */ -enum lttng_error_code ust_app_clear_session(struct ltt_session *session) -{ - int ret; - enum lttng_error_code cmd_ret = LTTNG_OK; - struct lttng_ht_iter iter; - struct ust_app *app; - struct ltt_ust_session *usess = session->ust_session; - - LTTNG_ASSERT(usess); - - rcu_read_lock(); - - if (usess->active) { - ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); - cmd_ret = LTTNG_ERR_FATAL; - goto end; - } - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { - struct buffer_reg_channel *buf_reg_chan; - struct consumer_socket *socket; - - /* Get consumer socket to use to push the metadata.*/ - socket = consumer_find_socket_by_bitness(reg->bits_per_long, - usess->consumer); - if (!socket) { - cmd_ret = LTTNG_ERR_INVALID; - goto error_socket; - } - - /* Clear the data channels. */ - cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, - buf_reg_chan, node.node) { - ret = consumer_clear_channel(socket, - buf_reg_chan->consumer_key); - if (ret < 0) { - goto error; - } - } - - (void) push_metadata(reg->registry->reg.ust, usess->consumer); - - /* - * Clear the metadata channel. - * Metadata channel is not cleared per se but we still need to - * perform a rotation operation on it behind the scene. - */ - ret = consumer_clear_channel(socket, - reg->registry->reg.ust->metadata_key); - if (ret < 0) { - goto error; - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct consumer_socket *socket; - struct lttng_ht_iter chan_iter; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness(app->bits_per_long, - usess->consumer); - if (!socket) { - cmd_ret = LTTNG_ERR_INVALID; - goto error_socket; - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Skip application."); - continue; - } - - /* Clear the data channels. */ - cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, - ua_chan, node.node) { - ret = consumer_clear_channel(socket, ua_chan->key); - if (ret < 0) { - /* Per-PID buffer and application going away. */ - if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { - continue; - } - goto error; - } - } - - (void) push_metadata(registry, usess->consumer); - - /* - * Clear the metadata channel. - * Metadata channel is not cleared per se but we still need to - * perform rotation operation on it behind the scene. - */ - ret = consumer_clear_channel(socket, registry->metadata_key); - if (ret < 0) { - /* Per-PID buffer and application going away. */ - if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { - continue; - } - goto error; - } - } - break; - } - default: - abort(); - break; - } - - cmd_ret = LTTNG_OK; - goto end; - -error: - switch (-ret) { - case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: - cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; - break; - default: - cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; - } - -error_socket: -end: - rcu_read_unlock(); - return cmd_ret; -} - -/* - * This function skips the metadata channel as the begin/end timestamps of a - * metadata packet are useless. - * - * Moreover, opening a packet after a "clear" will cause problems for live - * sessions as it will introduce padding that was not part of the first trace - * chunk. The relay daemon expects the content of the metadata stream of - * successive metadata trace chunks to be strict supersets of one another. - * - * For example, flushing a packet at the beginning of the metadata stream of - * a trace chunk resulting from a "clear" session command will cause the - * size of the metadata stream of the new trace chunk to not match the size of - * the metadata stream of the original chunk. This will confuse the relay - * daemon as the same "offset" in a metadata stream will no longer point - * to the same content. - */ -enum lttng_error_code ust_app_open_packets(struct ltt_session *session) -{ - enum lttng_error_code ret = LTTNG_OK; - struct lttng_ht_iter iter; - struct ltt_ust_session *usess = session->ust_session; - - LTTNG_ASSERT(usess); - - rcu_read_lock(); - - switch (usess->buffer_type) { - case LTTNG_BUFFER_PER_UID: - { - struct buffer_reg_uid *reg; - - cds_list_for_each_entry ( - reg, &usess->buffer_reg_uid_list, lnode) { - struct buffer_reg_channel *buf_reg_chan; - struct consumer_socket *socket; - - socket = consumer_find_socket_by_bitness( - reg->bits_per_long, usess->consumer); - if (!socket) { - ret = LTTNG_ERR_FATAL; - goto error; - } - - cds_lfht_for_each_entry(reg->registry->channels->ht, - &iter.iter, buf_reg_chan, node.node) { - const int open_ret = - consumer_open_channel_packets( - socket, - buf_reg_chan->consumer_key); - - if (open_ret < 0) { - ret = LTTNG_ERR_UNK; - goto error; - } - } - } - break; - } - case LTTNG_BUFFER_PER_PID: - { - struct ust_app *app; - - cds_lfht_for_each_entry ( - ust_app_ht->ht, &iter.iter, app, pid_n.node) { - struct consumer_socket *socket; - struct lttng_ht_iter chan_iter; - struct ust_app_channel *ua_chan; - struct ust_app_session *ua_sess; - struct ust_registry_session *registry; - - ua_sess = lookup_session_by_app(usess, app); - if (!ua_sess) { - /* Session not associated with this app. */ - continue; - } - - /* Get the right consumer socket for the application. */ - socket = consumer_find_socket_by_bitness( - app->bits_per_long, usess->consumer); - if (!socket) { - ret = LTTNG_ERR_FATAL; - goto error; - } - - registry = get_session_registry(ua_sess); - if (!registry) { - DBG("Application session is being torn down. Skip application."); - continue; - } - - cds_lfht_for_each_entry(ua_sess->channels->ht, - &chan_iter.iter, ua_chan, node.node) { - const int open_ret = - consumer_open_channel_packets( - socket, - ua_chan->key); - - if (open_ret < 0) { - /* - * Per-PID buffer and application going - * away. - */ - if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { - continue; - } - - ret = LTTNG_ERR_UNK; - goto error; - } - } - } - break; - } - default: - abort(); - break; - } - -error: - rcu_read_unlock(); - return ret; -}