+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <urcu/compiler.h>
-#include <signal.h>
-
-#include <common/bytecode/bytecode.h>
-#include <common/compat/errno.h>
-#include <common/common.h>
-#include <common/hashtable/utils.h>
-#include <lttng/event-rule/event-rule.h>
-#include <lttng/event-rule/event-rule-internal.h>
-#include <lttng/event-rule/user-tracepoint.h>
-#include <lttng/condition/condition.h>
-#include <lttng/condition/event-rule-matches-internal.h>
-#include <lttng/condition/event-rule-matches.h>
-#include <lttng/trigger/trigger-internal.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-
-#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;
-}
projects / lttng-tools.git / blobdiff