+++ /dev/null
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#define _LGPL_SOURCE
-#include <errno.h>
-#include <inttypes.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <urcu/compiler.h>
-#include <lttng/ust-error.h>
-#include <signal.h>
-
-#include <common/common.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-
-#include "buffer-registry.h"
-#include "fd-limit.h"
-#include "health-sessiond.h"
-#include "ust-app.h"
-#include "ust-consumer.h"
-#include "ust-ctl.h"
-#include "utils.h"
-
-/* 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 ustctl_consumer_channel_attr *attr,
- struct lttng_ust_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;
-}
-
-/*
- * 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;
-
- assert(node);
- assert(_key);
-
- event = caa_container_of(node, struct ust_app_event, node.node);
- key = _key;
-
- /* 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 (event->attr.loglevel != key->loglevel) {
- if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
- && key->loglevel == 0 && event->attr.loglevel == -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_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;
-
- assert(ua_chan);
- assert(ua_chan->events);
- assert(event);
-
- ht = ua_chan->events;
- key.name = event->attr.name;
- key.filter = event->filter;
- key.loglevel = 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);
- 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. */
- 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 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;
-
- 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, ua_sess->uid);
- if (!reg_uid) {
- goto error;
- }
- registry = reg_uid->registry->reg.ust;
- break;
- }
- default:
- assert(0);
- };
-
-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)
-{
- int ret;
-
- assert(ua_ctx);
-
- if (ua_ctx->obj) {
- ret = ustctl_release_object(sock, ua_ctx->obj);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
- sock, ua_ctx->obj->handle, ret);
- }
- 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)
-{
- int ret;
-
- assert(ua_event);
-
- free(ua_event->filter);
- if (ua_event->exclusion != NULL)
- free(ua_event->exclusion);
- if (ua_event->obj != NULL) {
- ret = ustctl_release_object(sock, ua_event->obj);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app sock %d release event obj failed with ret %d",
- sock, ret);
- }
- free(ua_event->obj);
- }
- free(ua_event);
-}
-
-/*
- * 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)
-{
- int ret = 0;
-
- assert(stream);
-
- if (stream->obj) {
- ret = ustctl_release_object(sock, stream->obj);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app sock %d release stream obj failed with ret %d",
- sock, ret);
- }
- 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)
-{
- assert(stream);
-
- (void) release_ust_app_stream(sock, stream);
- 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);
-}
-
-/*
- * Delete ust app channel safely. RCU read lock must be held before calling
- * this function.
- */
-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;
-
- 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);
- }
-
- /* 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);
- assert(!ret);
- delete_ust_app_ctx(sock, ua_ctx);
- }
-
- /* 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);
- assert(!ret);
- delete_ust_app_event(sock, ua_event);
- }
-
- 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);
- }
- }
-
- 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);
- assert(!ret);
- ret = ustctl_release_object(sock, ua_chan->obj);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app sock %d release channel obj failed with ret %d",
- sock, ret);
- }
- lttng_fd_put(LTTNG_FD_APPS, 1);
- free(ua_chan->obj);
- }
- call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu);
-}
-
-/*
- * Push metadata to consumer socket.
- *
- * The socket lock MUST be acquired.
- * The ust app session lock MUST be acquired.
- *
- * On success, return the len of metadata pushed or else a negative value.
- */
-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;
- ssize_t ret_val;
-
- assert(registry);
- assert(socket);
-
- /*
- * On a push metadata error either the consumer is dead or the metadata
- * channel has been destroyed because its endpoint might have died (e.g:
- * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
- * metadata again which is not valid anymore on the consumer side.
- *
- * The ust app session mutex locked allows us to make this check without
- * the registry lock.
- */
- if (registry->metadata_closed) {
- return -EPIPE;
- }
-
- pthread_mutex_lock(®istry->lock);
-
- offset = registry->metadata_len_sent;
- len = registry->metadata_len - registry->metadata_len_sent;
- 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 send out. */
- memcpy(metadata_str, registry->metadata + offset, len);
- registry->metadata_len_sent += len;
-
-push_data:
- pthread_mutex_unlock(®istry->lock);
- ret = consumer_push_metadata(socket, registry->metadata_key,
- metadata_str, len, offset);
- 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;
- }
-
- /* Update back the actual metadata len sent since it failed here. */
- pthread_mutex_lock(®istry->lock);
- registry->metadata_len_sent -= len;
- pthread_mutex_unlock(®istry->lock);
- ret_val = ret;
- goto error_push;
- }
-
- free(metadata_str);
- return len;
-
-end:
-error:
- pthread_mutex_unlock(®istry->lock);
-error_push:
- free(metadata_str);
- return ret_val;
-}
-
-/*
- * For a given application and session, push metadata to consumer. The session
- * lock MUST be acquired here before calling this.
- * 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.
- *
- * Return 0 on success else a negative error.
- */
-static int push_metadata(struct ust_registry_session *registry,
- struct consumer_output *consumer)
-{
- int ret_val;
- ssize_t ret;
- struct consumer_socket *socket;
-
- assert(registry);
- assert(consumer);
-
- rcu_read_lock();
-
- /*
- * Means that no metadata was assigned to the session. This can happens if
- * no start has been done previously.
- */
- if (!registry->metadata_key) {
- ret_val = 0;
- goto end_rcu_unlock;
- }
-
- /* 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_rcu_unlock;
- }
-
- /*
- * TODO: Currently, we hold the socket lock around sampling of the next
- * metadata segment to ensure we send metadata over the consumer socket in
- * the correct order. This makes the registry lock nest inside the socket
- * lock.
- *
- * Please note that this is a temporary measure: we should move this lock
- * back into ust_consumer_push_metadata() when the consumer gets the
- * ability to reorder the metadata it receives.
- */
- pthread_mutex_lock(socket->lock);
- ret = ust_app_push_metadata(registry, socket, 0);
- pthread_mutex_unlock(socket->lock);
- if (ret < 0) {
- ret_val = ret;
- goto error_rcu_unlock;
- }
-
- rcu_read_unlock();
- return 0;
-
-error_rcu_unlock:
- /*
- * 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;
-end_rcu_unlock:
- rcu_read_unlock();
- 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 acquired here unless the application is
- * in the destroy path.
- *
- * 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;
-
- assert(registry);
- assert(consumer);
-
- rcu_read_lock();
-
- if (!registry->metadata_key || registry->metadata_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 error;
- }
-
- ret = consumer_close_metadata(socket, registry->metadata_key);
- if (ret < 0) {
- goto error;
- }
-
-error:
- /*
- * 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;
-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.
- */
-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;
-
- assert(ua_sess);
-
- pthread_mutex_lock(&ua_sess->lock);
-
- registry = get_session_registry(ua_sess);
- if (registry && !registry->metadata_closed) {
- /* 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 &&
- !registry->metadata_closed) {
- /* 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);
- 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) {
- buffer_reg_pid_remove(reg_pid);
- buffer_reg_pid_destroy(reg_pid);
- }
- }
-
- if (ua_sess->handle != -1) {
- ret = ustctl_release_handle(sock, ua_sess->handle);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app sock %d release session handle failed with ret %d",
- sock, ret);
- }
- }
- pthread_mutex_unlock(&ua_sess->lock);
-
- 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;
-
- /* 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();
- }
-
- ht_cleanup_push(app->sessions);
- ht_cleanup_push(app->ust_objd);
-
- /*
- * 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);
-}
-
-/*
- * 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.
- */
-static void destroy_app_session(struct ust_app *app,
- struct ust_app_session *ua_sess)
-{
- int ret;
- struct lttng_ht_iter iter;
-
- assert(app);
- 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(struct ust_app *app)
-{
- 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_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(char *name,
- struct ust_app_session *ua_sess,
- struct lttng_ust_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 ustctl_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;
- }
- /* By default, the channel is a per cpu channel. */
- ua_chan->attr.type = LTTNG_UST_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_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("malloc");
- 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;
-}
-
-/*
- * Alloc new UST app context.
- */
-static
-struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *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));
- }
-
- DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
-
-error:
- return ua_ctx;
-}
-
-/*
- * Allocate a filter and copy the given original filter.
- *
- * Return allocated filter or NULL on error.
- */
-static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
- struct lttng_ust_filter_bytecode *orig_f)
-{
- struct lttng_ust_filter_bytecode *filter = NULL;
-
- /* Copy filter bytecode */
- filter = zmalloc(sizeof(*filter) + orig_f->len);
- if (!filter) {
- PERROR("zmalloc alloc ust app filter");
- goto error;
- }
-
- memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
-
-error:
- return filter;
-}
-
-/*
- * 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,
- char *name, struct lttng_ust_filter_bytecode *filter, int loglevel,
- 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;
-
- assert(name);
- assert(ht);
-
- /* Setup key for event lookup. */
- key.name = name;
- key.filter = filter;
- key.loglevel = loglevel;
- /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
- key.exclusion = (struct lttng_ust_event_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;
-}
-
-/*
- * 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();
-
- ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
- ua_chan->obj, &ua_ctx->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app create channel context failed for app (pid: %d) "
- "with ret %d", app->pid, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app disable event failed. Application is dead.");
- }
- 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_event_filter(struct ust_app_event *ua_event,
- struct ust_app *app)
-{
- int ret;
-
- health_code_update();
-
- if (!ua_event->filter) {
- ret = 0;
- goto error;
- }
-
- ret = ustctl_set_filter(app->sock, ua_event->filter,
- ua_event->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s filter failed for app (pid: %d) "
- "with ret %d", ua_event->attr.name, app->pid, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app filter event failed. Application is dead.");
- }
- goto error;
- }
-
- DBG2("UST filter set successfully for event %s", ua_event->name);
-
-error:
- health_code_update();
- return ret;
-}
-
-/*
- * Set event exclusions on the tracer.
- */
-static
-int set_ust_event_exclusion(struct ust_app_event *ua_event,
- struct ust_app *app)
-{
- int ret;
-
- health_code_update();
-
- if (!ua_event->exclusion || !ua_event->exclusion->count) {
- ret = 0;
- goto error;
- }
-
- ret = ustctl_set_exclusion(app->sock, ua_event->exclusion,
- ua_event->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s exclusions failed for app (pid: %d) "
- "with ret %d", ua_event->attr.name, app->pid, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app event exclusion failed. Application is dead.");
- }
- goto error;
- }
-
- DBG2("UST exclusion set successfully for event %s", ua_event->name);
-
-error:
- health_code_update();
- return ret;
-}
-
-/*
- * Disable the specified event on to UST tracer for the UST session.
- */
-static int disable_ust_event(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
-{
- int ret;
-
- health_code_update();
-
- ret = ustctl_disable(app->sock, ua_event->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s disable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->pid, ua_sess->handle, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app disable event failed. Application is dead.");
- }
- goto error;
- }
-
- DBG2("UST app event %s disabled successfully for app (pid: %d)",
- ua_event->attr.name, 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();
-
- ret = ustctl_disable(app->sock, ua_chan->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app channel %s disable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_chan->name, app->pid, ua_sess->handle, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app disable channel failed. Application is dead.");
- }
- 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();
-
- ret = ustctl_enable(app->sock, ua_chan->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app channel %s enable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_chan->name, app->pid, ua_sess->handle, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app enable channel failed. Application is dead.");
- }
- 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_event(struct ust_app *app,
- struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
-{
- int ret;
-
- health_code_update();
-
- ret = ustctl_enable(app->sock, ua_event->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app event %s enable failed for app (pid: %d) "
- "and session handle %d with ret %d",
- ua_event->attr.name, app->pid, ua_sess->handle, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app enable event failed. Application is dead.");
- }
- goto error;
- }
-
- DBG2("UST app event %s enabled successfully for app (pid: %d)",
- ua_event->attr.name, 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;
-
- assert(app);
- assert(ua_sess);
- 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 < 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 < 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);
- }
- /* 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 */
- ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
- &ua_event->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Error ustctl create event %s for app pid: %d with ret %d",
- ua_event->attr.name, app->pid, ret);
- } else {
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- ret = 0;
- DBG3("UST app create event failed. Application is dead.");
- }
- goto error;
- }
-
- ua_event->handle = ua_event->obj->handle;
-
- DBG2("UST app event %s created successfully for pid:%d",
- ua_event->attr.name, app->pid);
-
- health_code_update();
-
- /* Set filter if one is present. */
- if (ua_event->filter) {
- ret = set_ust_event_filter(ua_event, app);
- if (ret < 0) {
- goto error;
- }
- }
-
- /* Set exclusions for the event */
- if (ua_event->exclusion) {
- ret = set_ust_event_exclusion(ua_event, app);
- 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_event(app, ua_sess, ua_event);
- 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 */
- assert(0);
- 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;
-}
-
-/*
- * 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 = alloc_copy_ust_app_filter(uevent->filter);
- /* Filter might be NULL here in case of ENONEM. */
- }
-
- /* Copy exclusion data */
- if (uevent->exclusion) {
- exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) +
- LTTNG_UST_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)
-{
- struct lttng_ht_iter iter;
- struct ltt_ust_event *uevent;
- struct ltt_ust_context *uctx;
- struct ust_app_event *ua_event;
- struct ust_app_ctx *ua_ctx;
-
- 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->attr.output = uchan->attr.output;
- /*
- * 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;
-
- cds_list_for_each_entry(uctx, &uchan->ctx_list, list) {
- ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
- if (ua_ctx == NULL) {
- continue;
- }
- 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);
- }
-
- /* Copy all events from ltt ust channel to ust app channel */
- cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.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("UST event %s not found on shadow copy channel",
- uevent->attr.name);
- ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
- if (ua_event == NULL) {
- continue;
- }
- shadow_copy_event(ua_event, uevent);
- add_unique_ust_app_event(ua_chan, ua_event);
- }
- }
-
- 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 lttng_ht_node_str *ua_chan_node;
- struct lttng_ht_iter iter;
- struct ltt_ust_channel *uchan;
- struct ust_app_channel *ua_chan;
- time_t rawtime;
- struct tm *timeinfo;
- char datetime[16];
- int ret;
-
- /* Get date and time for unique app path */
- time(&rawtime);
- timeinfo = localtime(&rawtime);
- 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();
- ua_sess->uid = app->uid;
- ua_sess->gid = app->gid;
- ua_sess->euid = usess->uid;
- ua_sess->egid = 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. */
- 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, ua_sess->uid, app->bits_per_long);
- break;
- default:
- assert(0);
- goto error;
- }
- if (ret < 0) {
- PERROR("asprintf UST shadow copy session");
- assert(0);
- goto error;
- }
-
- /* Iterate over all channels in global domain. */
- cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
- uchan, node.node) {
- struct lttng_ht_iter uiter;
-
- 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) {
- /* Session exist. Contiuing. */
- continue;
- }
-
- DBG2("Channel %s not found on shadow session copy, creating it",
- uchan->name);
- ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr);
- if (ua_chan == NULL) {
- /* malloc failed FIXME: Might want to do handle ENOMEM .. */
- continue;
- }
- shadow_copy_channel(ua_chan, uchan);
- /*
- * The concept of metadata channel does not exist on the tracing
- * registry side of the session daemon so this can only be a per CPU
- * channel and not metadata.
- */
- ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU;
-
- lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
- }
-
-error:
- return;
-}
-
-/*
- * Lookup sesison wrapper.
- */
-static
-void __lookup_session_by_app(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(
- 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;
-
- assert(ua_sess);
- 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);
- if (ret < 0) {
- goto error;
- }
- buffer_reg_pid_add(reg_pid);
- } 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);
- if (ret < 0) {
- goto error;
- }
-
- 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 *app, struct buffer_reg_uid **regp)
-{
- int ret = 0;
- struct buffer_reg_uid *reg_uid;
-
- assert(usess);
- 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);
- if (ret < 0) {
- goto error;
- }
- buffer_reg_uid_add(reg_uid);
- } 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);
- if (ret < 0) {
- goto error;
- }
- /* Add node to teardown list of the session. */
- cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list);
-
- 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 ustctl_create_session fails.
- */
-static int 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;
-
- assert(usess);
- assert(app);
- 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(app);
- 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) {
- goto error;
- }
- break;
- case LTTNG_BUFFER_PER_UID:
- /* Look for a global registry. If none exists, create one. */
- ret = setup_buffer_reg_uid(usess, app, NULL);
- if (ret < 0) {
- goto error;
- }
- break;
- default:
- assert(0);
- ret = -EINVAL;
- goto error;
- }
-
- health_code_update();
-
- if (ua_sess->handle == -1) {
- ret = ustctl_create_session(app->sock);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Creating session for app pid %d with ret %d",
- app->pid, ret);
- } else {
- DBG("UST app creating session failed. Application is dead");
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally. This will get flagged ENOTCONN and the
- * caller will handle it.
- */
- ret = 0;
- }
- 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);
-
- 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 *key;
-
- assert(node);
- 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;
- }
-
- /* Check the name in the case of perf thread counters. */
- if (key->ctx == LTTNG_UST_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;
- }
- }
-
- /* Match. */
- return 1;
-
-no_match:
- return 0;
-}
-
-/*
- * Lookup for an ust app context from an lttng_ust_context.
- *
- * 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 *uctx)
-{
- struct lttng_ht_iter iter;
- struct lttng_ht_node_ulong *node;
- struct ust_app_ctx *app_ctx = NULL;
-
- assert(uctx);
- 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_session *ua_sess,
- struct ust_app_channel *ua_chan, struct lttng_ust_context *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 = -1;
- 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_event(app, ua_sess, ua_event);
- 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_event(app, ua_sess, ua_event);
- 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.
- *
- * 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)
-{
- int ret;
- unsigned int nb_fd = 0;
- struct consumer_socket *socket;
-
- assert(usess);
- assert(ua_sess);
- assert(ua_chan);
- 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);
- 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 wil 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;
-
- assert(reg_stream);
- assert(stream);
-
- /* Reserve the amount of file descriptor we need. */
- 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 = ustctl_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 *reg_chan,
- struct ust_app_channel *ua_chan)
-{
- int ret;
-
- assert(reg_chan);
- assert(ua_chan);
-
- /* Need two fds for the channel. */
- 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 = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust);
- if (ret < 0) {
- ERR("Duplicate channel obj from %p to %p failed with ret: %d",
- 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 *reg_chan,
- struct ust_app_channel *ua_chan)
-{
- int ret = 0;
- struct ust_app_stream *stream, *stmp;
-
- assert(reg_chan);
- 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, reg_chan);
-
- /* We don't need the streams anymore. */
- cds_list_del(&stream->list);
- delete_ust_app_stream(-1, stream);
- }
-
-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 *reg_chan = NULL;
-
- assert(reg_sess);
- 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, ®_chan);
- if (ret < 0) {
- goto error_create;
- }
- assert(reg_chan);
- reg_chan->consumer_key = ua_chan->key;
- reg_chan->subbuf_size = ua_chan->attr.subbuf_size;
-
- /* 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, reg_chan);
-
- if (regp) {
- *regp = reg_chan;
- }
-
- return 0;
-
-error:
- /* Safe because the registry channel object was not added to any HT. */
- buffer_reg_channel_destroy(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 *reg_chan)
-{
- int ret;
-
- assert(reg_sess);
- assert(reg_chan);
- assert(ua_chan);
- 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(reg_chan, ua_chan);
- if (ret < 0) {
- goto error;
- }
-
- reg_chan->obj.ust = ua_chan->obj;
- ua_chan->obj = NULL;
-
- return 0;
-
-error:
- buffer_reg_channel_remove(reg_sess, reg_chan);
- buffer_reg_channel_destroy(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 *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;
-
- assert(reg_chan);
- assert(app);
- assert(ua_sess);
- assert(ua_chan);
-
- DBG("UST app sending buffer registry channel to ust sock %d", app->sock);
-
- ret = duplicate_channel_object(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 < 0) {
- goto error;
- }
-
- health_code_update();
-
- /* Send all streams to application. */
- pthread_mutex_lock(®_chan->stream_list_lock);
- cds_list_for_each_entry(reg_stream, ®_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) {
- (void) release_ust_app_stream(-1, &stream);
- 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);
- }
- ua_chan->is_sent = 1;
-
-error_stream_unlock:
- pthread_mutex_unlock(®_chan->stream_list_lock);
-error:
- return ret;
-}
-
-/*
- * Create and send to the application the created buffers with per UID buffers.
- *
- * 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 *reg_chan;
-
- assert(app);
- assert(usess);
- assert(ua_sess);
- 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.
- */
- assert(reg_uid);
-
- reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id,
- reg_uid);
- if (!reg_chan) {
- /* Create the buffer registry channel object. */
- ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan);
- if (ret < 0) {
- ERR("Error creating the UST channel \"%s\" registry instance",
- ua_chan->name);
- goto error;
- }
- assert(reg_chan);
-
- /*
- * 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);
- 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);
- buffer_reg_channel_remove(reg_uid->registry, reg_chan);
- buffer_reg_channel_destroy(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, reg_chan);
- if (ret < 0) {
- ERR("Error setting up UST channel \"%s\"",
- ua_chan->name);
- goto error;
- }
-
- }
-
- /* Send buffers to the application. */
- ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan);
- if (ret < 0) {
- /*
- * Don't report error to the console, since it may be
- * caused by application concurrently exiting.
- */
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * Create and send to the application the created buffers with per PID buffers.
- *
- * 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;
-
- assert(app);
- assert(usess);
- assert(ua_sess);
- 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);
- 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;
- }
-
- /* Create and get channel on the consumer side. */
- ret = do_consumer_create_channel(usess, ua_sess, ua_chan,
- app->bits_per_long, registry);
- if (ret < 0) {
- ERR("Error creating UST channel \"%s\" on the consumer daemon",
- ua_chan->name);
- goto error;
- }
-
- ret = send_channel_pid_to_ust(app, ua_sess, ua_chan);
- if (ret < 0) {
- /*
- * Don't report error to the console, since it may be
- * caused by application concurrently exiting.
- */
- goto error;
- }
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * From an already allocated ust app channel, create the channel buffers if
- * need and send it to the application. This MUST be called with a RCU read
- * side lock acquired.
- *
- * Return 0 on success or else a negative value.
- */
-static int do_create_channel(struct ust_app *app,
- struct ltt_ust_session *usess, struct ust_app_session *ua_sess,
- struct ust_app_channel *ua_chan)
-{
- int ret;
-
- assert(app);
- assert(usess);
- assert(ua_sess);
- 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:
- assert(0);
- 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 create it on the tracer. Set ua_chanp of the
- * newly created channel 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 create_ust_app_channel(struct ust_app_session *ua_sess,
- struct ltt_ust_channel *uchan, struct ust_app *app,
- enum lttng_ust_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_alloc;
- }
- shadow_copy_channel(ua_chan, uchan);
-
- /* Set channel type. */
- ua_chan->attr.type = type;
-
- ret = do_create_channel(app, usess, ua_sess, ua_chan);
- if (ret < 0) {
- goto error;
- }
-
- DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
- app->pid);
-
- /* 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:
- delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app);
-error_alloc:
- return ret;
-}
-
-/*
- * Create UST app event and create it on the tracer side.
- *
- * 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;
-
- /* 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) {
- ret = -EEXIST;
- goto end;
- }
-
- /* Does not exist so create one */
- ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
- if (ua_event == NULL) {
- /* Only malloc can failed so something is really wrong */
- 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 */
- assert(ret != -LTTNG_UST_ERR_EXIST);
- goto error;
- }
-
- add_unique_ust_app_event(ua_chan, ua_event);
-
- DBG2("UST app create event %s for PID %d completed", ua_event->name,
- app->pid);
-
-end:
- return ret;
-
-error:
- /* Valid. Calling here is already in a read side lock */
- delete_ust_app_event(-1, ua_event);
- 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;
-
- assert(ua_sess);
- assert(app);
- assert(consumer);
-
- registry = get_session_registry(ua_sess);
- assert(registry);
-
- /* 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;
-
- /*
- * 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);
- 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:
- 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)
-{
- struct ust_app *lta = NULL;
-
- assert(msg);
- assert(sock >= 0);
-
- DBG3("UST app creating application for socket %d", sock);
-
- if ((msg->bits_per_long == 64 &&
- (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
- || (msg->bits_per_long == 32 &&
- (uatomic_read(&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;
- }
-
- lta = zmalloc(sizeof(struct ust_app));
- if (lta == NULL) {
- PERROR("malloc");
- goto error;
- }
-
- 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->notify_sock = -1;
-
- /* 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;
- lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock);
-
- CDS_INIT_LIST_HEAD(<a->teardown_head);
-
-error:
- return lta;
-}
-
-/*
- * For a given application object, add it to every hash table.
- */
-void ust_app_add(struct ust_app *app)
-{
- assert(app);
- assert(app->notify_sock >= 0);
-
- 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;
-
- assert(app);
-
- ret = ustctl_tracer_version(app->sock, &app->version);
- if (ret < 0) {
- if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) {
- ERR("UST app %d version failed with ret %d", app->sock, ret);
- } else {
- DBG3("UST app %d version failed. Application is dead", app->sock);
- }
- }
-
- 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 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), &iter);
- node = lttng_ht_iter_get_node_ulong(&iter);
- assert(node);
-
- lta = caa_container_of(node, struct ust_app, sock_n);
- DBG("PID %d unregistering with sock %d", lta->pid, sock);
-
- /* Remove application from PID hash table */
- ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
- 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 other
- * 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);
- }
-
- /* 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;
- }
-
- /*
- * 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);
-
- /*
- * 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 && !registry->metadata_closed) {
- /* 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 &&
- !registry->metadata_closed) {
- /* 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);
- }
-
- /* 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_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;
- }
- handle = ustctl_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);
- }
- continue;
- }
-
- while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
- &uiter)) != -LTTNG_UST_ERR_NOENT) {
- /* Handle ustctl error. */
- if (ret < 0) {
- 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");
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally. Continue normal execution.
- */
- break;
- }
- free(tmp_event);
- 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) {
- PERROR("realloc ust app events");
- free(tmp_event);
- ret = -ENOMEM;
- 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_SYM_NAME_LEN);
- tmp_event[count].loglevel = uiter.loglevel;
- tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
- tmp_event[count].pid = app->pid;
- tmp_event[count].enabled = -1;
- count++;
- }
- }
-
- 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_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;
- }
- handle = ustctl_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);
- }
- continue;
- }
-
- while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
- &uiter)) != -LTTNG_UST_ERR_NOENT) {
- /* Handle ustctl error. */
- if (ret < 0) {
- 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");
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally. Reset list and count for next app.
- */
- break;
- }
- free(tmp_event);
- 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) {
- PERROR("realloc ust app event fields");
- free(tmp_event);
- ret = -ENOMEM;
- 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_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_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 = 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();
-
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
- ret = lttng_ht_del(ust_app_ht, &iter);
- assert(!ret);
- call_rcu(&app->pid_n.head, delete_ust_app_rcu);
- }
-
- /* Cleanup socket hash table */
- 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);
- assert(!ret);
- }
-
- /* Cleanup notify socket hash table */
- cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app,
- notify_sock_n.node) {
- ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter);
- assert(!ret);
- }
- rcu_read_unlock();
-
- /* Destroy is done only when the ht is empty */
- ht_cleanup_push(ust_app_ht);
- ht_cleanup_push(ust_app_ht_by_sock);
- ht_cleanup_push(ust_app_ht_by_notify_sock);
-}
-
-/*
- * Init UST app hash table.
- */
-void ust_app_ht_alloc(void)
-{
- ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
-}
-
-/*
- * 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;
-
- if (usess == NULL || uchan == NULL) {
- ERR("Disabling UST global channel with NULL values");
- ret = -1;
- goto error;
- }
-
- 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 */
- assert(ua_chan_node);
-
- ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
- /* The channel must not be already disabled */
- 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();
-
-error:
- 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;
-
- if (usess == NULL || uchan == NULL) {
- ERR("Adding UST global channel to NULL values");
- ret = -1;
- goto error;
- }
-
- 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();
-
-error:
- 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, *ua_event_node;
- struct ust_app *app;
- struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
- struct ust_app_event *ua_event;
-
- 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);
-
- lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
- ua_event_node = lttng_ht_iter_get_node_str(&uiter);
- if (ua_event_node == NULL) {
- DBG2("Event %s not found in channel %s for app pid %d."
- "Skipping", uevent->attr.name, uchan->name, app->pid);
- continue;
- }
- ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
-
- ret = disable_ust_app_event(ua_sess, ua_event, app);
- if (ret < 0) {
- /* XXX: Report error someday... */
- continue;
- }
- }
-
- rcu_read_unlock();
-
- return ret;
-}
-
-/*
- * For a specific UST session, create the channel for all registered apps.
- */
-int ust_app_create_channel_glb(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan)
-{
- int ret = 0, created;
- struct lttng_ht_iter iter;
- struct ust_app *app;
- struct ust_app_session *ua_sess = NULL;
-
- /* Very wrong code flow */
- assert(usess);
- assert(uchan);
-
- DBG2("UST app adding channel %s to UST 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;
- }
- /*
- * Create session on the tracer side and add it to app session HT. Note
- * that if session exist, it will simply return a pointer to the ust
- * app session.
- */
- ret = create_ust_app_session(usess, app, &ua_sess, &created);
- 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.
- */
- continue;
- case -ENOMEM:
- default:
- goto error_rcu_unlock;
- }
- }
- assert(ua_sess);
-
- pthread_mutex_lock(&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 {
- /* Create channel onto application. We don't need the chan ref. */
- ret = create_ust_app_channel(ua_sess, uchan, app,
- LTTNG_UST_CHAN_PER_CPU, usess, NULL);
- }
- pthread_mutex_unlock(&ua_sess->lock);
- if (ret < 0) {
- if (ret == -ENOMEM) {
- /* No more memory is a fatal error. Stop right now. */
- goto error_rcu_unlock;
- }
- /* Cleanup the created session if it's the case. */
- if (created) {
- destroy_app_session(app, ua_sess);
- }
- }
- }
-
-error_rcu_unlock:
- rcu_read_unlock();
- 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;
-
- 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);
-
- /* 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 */
- assert(ua_chan_node);
-
- 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;
-
- 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);
- /* 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 */
- 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.
- */
-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);
-
- /* Upon restart, we skip the setup, already done */
- if (ua_sess->started) {
- goto skip_setup;
- }
-
- /* Create directories if consumer is LOCAL and has a path defined. */
- if (usess->consumer->type == CONSUMER_DST_LOCAL &&
- strlen(usess->consumer->dst.trace_path) > 0) {
- ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
- S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid);
- if (ret < 0) {
- if (ret != -EEXIST) {
- ERR("Trace directory creation error");
- goto error_unlock;
- }
- }
- }
-
- /*
- * Create the metadata for the application. This returns gracefully if a
- * metadata was already set for the session.
- */
- ret = create_ust_app_metadata(ua_sess, app, usess->consumer);
- if (ret < 0) {
- goto error_unlock;
- }
-
- health_code_update();
-
-skip_setup:
- /* This start the UST tracing */
- ret = ustctl_start_session(app->sock, ua_sess->handle);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Error starting tracing for app pid: %d (ret: %d)",
- app->pid, ret);
- } else {
- DBG("UST app start session failed. Application is dead.");
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- pthread_mutex_unlock(&ua_sess->lock);
- goto end;
- }
- goto error_unlock;
- }
-
- /* Indicate that the session has been started once */
- ua_sess->started = 1;
-
- pthread_mutex_unlock(&ua_sess->lock);
-
- health_code_update();
-
- /* Quiescent wait after starting trace */
- ret = ustctl_wait_quiescent(app->sock);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app wait quiescent failed for app pid %d ret %d",
- app->pid, ret);
- }
-
-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 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 */
- ret = ustctl_stop_session(app->sock, ua_sess->handle);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("Error stopping tracing for app pid: %d (ret: %d)",
- app->pid, ret);
- } else {
- DBG("UST app stop session failed. Application is dead.");
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- goto end_unlock;
- }
- goto error_rcu_unlock;
- }
-
- health_code_update();
-
- /* Quiescent wait after stopping trace */
- ret = ustctl_wait_quiescent(app->sock);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app wait quiescent failed for app pid %d ret %d",
- app->pid, ret);
- }
-
- health_code_update();
-
- registry = get_session_registry(ua_sess);
- assert(registry);
-
- if (!registry->metadata_closed) {
- /* 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;
-}
-
-/*
- * Flush buffers for a specific UST session and app.
- */
-static
-int ust_app_flush_trace(struct ltt_ust_session *usess, struct ust_app *app)
-{
- int ret = 0;
- struct lttng_ht_iter iter;
- struct ust_app_session *ua_sess;
- struct ust_app_channel *ua_chan;
-
- DBG("Flushing buffers 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);
-
- health_code_update();
-
- /* Flushing buffers */
- cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
- node.node) {
- health_code_update();
- assert(ua_chan->is_sent);
- ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app PID %d channel %s flush failed with ret %d",
- app->pid, ua_chan->name, ret);
- } else {
- DBG3("UST app failed to flush %s. Application is dead.",
- ua_chan->name);
- /*
- * This is normal behavior, an application can die during the
- * creation process. Don't report an error so the execution can
- * continue normally.
- */
- }
- /* Continuing flushing all buffers */
- continue;
- }
- }
-
- health_code_update();
-
- pthread_mutex_unlock(&ua_sess->lock);
-end_no_session:
- rcu_read_unlock();
- health_code_update();
- return 0;
-}
-
-/*
- * 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 */
- ret = ustctl_wait_quiescent(app->sock);
- if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app wait quiescent failed for app pid %d ret %d",
- app->pid, ret);
- }
-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)
-{
- int ret = 0;
- struct lttng_ht_iter iter;
- struct ust_app *app;
-
- DBG("Starting all UST traces");
-
- rcu_read_lock();
-
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
- ret = ust_app_start_trace(usess, app);
- if (ret < 0) {
- /* Continue to next apps even on error */
- continue;
- }
- }
-
- rcu_read_unlock();
-
- return 0;
-}
-
-/*
- * Start tracing for the UST session.
- */
-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");
-
- 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;
- }
- }
-
- /* Flush buffers and push metadata (for UID buffers). */
- switch (usess->buffer_type) {
- case LTTNG_BUFFER_PER_UID:
- {
- struct buffer_reg_uid *reg;
-
- /* 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 *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,
- 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, reg_chan->consumer_key);
- }
-
- ust_session_reg = reg->registry->reg.ust;
- if (!ust_session_reg->metadata_closed) {
- /* Push metadata. */
- (void) push_metadata(ust_session_reg, usess->consumer);
- }
- }
-
- break;
- }
- case LTTNG_BUFFER_PER_PID:
- cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
- ret = ust_app_flush_trace(usess, app);
- if (ret < 0) {
- /* Continue to next apps even on error */
- continue;
- }
- }
- break;
- default:
- assert(0);
- break;
- }
-
- 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;
-}
-
-/*
- * Add channels/events from UST global domain to registered apps at sock.
- */
-void ust_app_global_update(struct ltt_ust_session *usess, int sock)
-{
- int ret = 0;
- struct lttng_ht_iter iter, uiter;
- struct ust_app *app;
- struct ust_app_session *ua_sess = NULL;
- struct ust_app_channel *ua_chan;
- struct ust_app_event *ua_event;
- struct ust_app_ctx *ua_ctx;
-
- assert(usess);
- assert(sock >= 0);
-
- DBG2("UST app global update for app sock %d for session id %" PRIu64, sock,
- usess->id);
-
- rcu_read_lock();
-
- app = ust_app_find_by_sock(sock);
- if (app == NULL) {
- /*
- * Application can be unregistered before so this is possible hence
- * simply stopping the update.
- */
- DBG3("UST app update failed to find app sock %d", sock);
- goto error;
- }
-
- if (!app->compatible) {
- goto error;
- }
-
- ret = create_ust_app_session(usess, app, &ua_sess, NULL);
- if (ret < 0) {
- /* Tracer is probably gone or ENOMEM. */
- goto error;
- }
- assert(ua_sess);
-
- pthread_mutex_lock(&ua_sess->lock);
-
- /*
- * We can iterate safely here over all UST app session since the create ust
- * app session above made a shadow copy of the UST global domain from the
- * ltt ust session.
- */
- cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
- node.node) {
- ret = do_create_channel(app, usess, ua_sess, ua_chan);
- if (ret < 0) {
- /*
- * Stop everything. On error, the application failed, no more
- * file descriptor are available or ENOMEM so stopping here is
- * the only thing we can do for now.
- */
- goto error_unlock;
- }
-
- /*
- * Add context using the list so they are enabled in the same order the
- * user added them.
- */
- cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) {
- ret = create_ust_channel_context(ua_chan, ua_ctx, app);
- if (ret < 0) {
- goto error_unlock;
- }
- }
-
-
- /* For each events */
- cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
- node.node) {
- ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
- if (ret < 0) {
- goto error_unlock;
- }
- }
- }
-
- pthread_mutex_unlock(&ua_sess->lock);
-
- if (usess->active) {
- ret = ust_app_start_trace(usess, app);
- if (ret < 0) {
- goto error;
- }
-
- DBG2("UST trace started for app pid %d", app->pid);
- }
-
- /* Everything went well at this point. */
- rcu_read_unlock();
- return;
-
-error_unlock:
- pthread_mutex_unlock(&ua_sess->lock);
-error:
- if (ua_sess) {
- destroy_app_session(app, ua_sess);
- }
- rcu_read_unlock();
- return;
-}
-
-/*
- * 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;
-
- 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);
- /* 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_sess, ua_chan, &uctx->ctx, app);
- if (ret < 0) {
- goto next_app;
- }
- next_app:
- pthread_mutex_unlock(&ua_sess->lock);
- }
-
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Enable event for a channel from a UST session for a specific PID.
- */
-int ust_app_enable_event_pid(struct ltt_ust_session *usess,
- struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
-{
- 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;
- struct ust_app_event *ua_event;
-
- DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
-
- rcu_read_lock();
-
- app = ust_app_find_by_pid(pid);
- if (app == NULL) {
- ERR("UST app enable event per PID %d not found", pid);
- ret = -1;
- goto end;
- }
-
- if (!app->compatible) {
- ret = 0;
- goto end;
- }
-
- ua_sess = lookup_session_by_app(usess, app);
- if (!ua_sess) {
- /* The application has problem or is probably dead. */
- ret = 0;
- goto end;
- }
-
- pthread_mutex_lock(&ua_sess->lock);
- /* 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 the channel is not found, there is a code flow error */
- assert(ua_chan_node);
-
- 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) {
- ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
- if (ret < 0) {
- goto end_unlock;
- }
- } else {
- ret = enable_ust_app_event(ua_sess, ua_event, app);
- if (ret < 0) {
- goto end_unlock;
- }
- }
-
-end_unlock:
- pthread_mutex_unlock(&ua_sess->lock);
-end:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Calibrate registered applications.
- */
-int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
-{
- int ret = 0;
- 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) {
- if (!app->compatible) {
- /*
- * TODO: In time, we should notice the caller of this error by
- * telling him that this is a version error.
- */
- continue;
- }
-
- health_code_update();
-
- ret = ustctl_calibrate(app->sock, calibrate);
- if (ret < 0) {
- switch (ret) {
- case -ENOSYS:
- /* Means that it's not implemented on the tracer side. */
- ret = 0;
- break;
- default:
- DBG2("Calibrate app PID %d returned with error %d",
- app->pid, ret);
- break;
- }
- }
- }
-
- DBG("UST app global domain calibration finished");
-
- rcu_read_unlock();
-
- health_code_update();
-
- 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;
-
- assert(msg);
-
- ret = ustctl_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 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;
-
- 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 sobjd, int cobjd,
- size_t nr_fields, struct ustctl_field *fields)
-{
- int ret, ret_code = 0;
- uint32_t chan_id, reg_count;
- uint64_t chan_reg_key;
- enum ustctl_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 *chan_reg;
-
- 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 teardown. Abort event notify",
- sock);
- ret = 0;
- free(fields);
- 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 teardown. Abort event notify");
- ret = 0;
- free(fields);
- goto error_rcu_unlock;
- }
-
- 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);
- assert(registry);
-
- /* 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);
-
- chan_reg = ust_registry_channel_find(registry, chan_reg_key);
- assert(chan_reg);
-
- if (!chan_reg->register_done) {
- reg_count = ust_registry_get_event_count(chan_reg);
- if (reg_count < 31) {
- type = USTCTL_CHANNEL_HEADER_COMPACT;
- } else {
- type = USTCTL_CHANNEL_HEADER_LARGE;
- }
-
- chan_reg->nr_ctx_fields = nr_fields;
- chan_reg->ctx_fields = fields;
- chan_reg->header_type = type;
- } else {
- /* Get current already assigned values. */
- type = chan_reg->header_type;
- free(fields);
- /* Set to NULL so the error path does not do a double free. */
- fields = NULL;
- }
- /* Channel id is set during the object creation. */
- chan_id = chan_reg->chan_id;
-
- /* Append to metadata */
- if (!chan_reg->metadata_dumped) {
- ret_code = ust_metadata_channel_statedump(registry, chan_reg);
- 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 = ustctl_reply_register_channel(sock, chan_id, type, ret_code);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app reply channel failed with ret %d", ret);
- } else {
- DBG3("UST app reply channel failed. Application died");
- }
- goto error;
- }
-
- /* This channel registry registration is completed. */
- chan_reg->register_done = 1;
-
-error:
- pthread_mutex_unlock(®istry->lock);
-error_rcu_unlock:
- rcu_read_unlock();
- if (ret) {
- 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 ustctl_field *fields, int loglevel,
- 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 teardown. Abort event notify",
- sock);
- ret = 0;
- free(sig);
- free(fields);
- free(model_emf_uri);
- 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 teardown. Abort event notify");
- ret = 0;
- free(sig);
- free(fields);
- free(model_emf_uri);
- goto error_rcu_unlock;
- }
-
- assert(ua_chan->session);
- ua_sess = ua_chan->session;
-
- registry = get_session_registry(ua_sess);
- assert(registry);
-
- 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,
- model_emf_uri, ua_sess->buffer_type, &event_id,
- app);
-
- /*
- * 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 = ustctl_reply_register_event(sock, event_id, ret_code);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app reply event failed with ret %d", ret);
- } else {
- DBG3("UST app reply event failed. Application died");
- }
- /*
- * 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();
- 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 ustctl_notify_cmd cmd;
-
- DBG3("UST app receiving notify from sock %d", sock);
-
- ret = ustctl_recv_notify(sock, &cmd);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app recv notify failed with ret %d", ret);
- } else {
- DBG3("UST app recv notify failed. Application died");
- }
- goto error;
- }
-
- switch (cmd) {
- case USTCTL_NOTIFY_CMD_EVENT:
- {
- int sobjd, cobjd, loglevel;
- char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri;
- size_t nr_fields;
- struct ustctl_field *fields;
-
- DBG2("UST app ustctl register event received");
-
- ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, &loglevel,
- &sig, &nr_fields, &fields, &model_emf_uri);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app recv event failed with ret %d", ret);
- } else {
- DBG3("UST app recv event failed. Application died");
- }
- 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, model_emf_uri);
- if (ret < 0) {
- goto error;
- }
-
- break;
- }
- case USTCTL_NOTIFY_CMD_CHANNEL:
- {
- int sobjd, cobjd;
- size_t nr_fields;
- struct ustctl_field *fields;
-
- DBG2("UST app ustctl register channel received");
-
- ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields,
- &fields);
- if (ret < 0) {
- if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) {
- ERR("UST app recv channel failed with ret %d", ret);
- } else {
- DBG3("UST app recv channel failed. Application died");
- }
- 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, sobjd, cobjd, nr_fields,
- fields);
- if (ret < 0) {
- goto error;
- }
-
- break;
- }
- default:
- /* Should NEVER happen. */
- assert(0);
- }
-
-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;
-
- 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.
- *
- * Return 0 on success or else a negative value.
- */
-int ust_app_snapshot_record(struct ltt_ust_session *usess,
- struct snapshot_output *output, int wait, uint64_t max_stream_size)
-{
- int ret = 0;
- unsigned int snapshot_done = 0;
- struct lttng_ht_iter iter;
- struct ust_app *app;
- char pathname[PATH_MAX];
-
- assert(usess);
- 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 *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) {
- ret = -EINVAL;
- goto error;
- }
-
- memset(pathname, 0, sizeof(pathname));
- ret = snprintf(pathname, sizeof(pathname),
- DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH,
- reg->uid, reg->bits_per_long);
- if (ret < 0) {
- PERROR("snprintf snapshot path");
- goto error;
- }
-
- /* Add the UST default trace dir to path. */
- cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
- reg_chan, node.node) {
- ret = consumer_snapshot_channel(socket, reg_chan->consumer_key,
- output, 0, usess->uid, usess->gid, pathname, wait,
- max_stream_size);
- if (ret < 0) {
- goto error;
- }
- }
- ret = consumer_snapshot_channel(socket,
- reg->registry->reg.ust->metadata_key, output, 1,
- usess->uid, usess->gid, pathname, wait, max_stream_size);
- if (ret < 0) {
- goto error;
- }
- snapshot_done = 1;
- }
- 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,
- output->consumer);
- if (!socket) {
- ret = -EINVAL;
- goto error;
- }
-
- /* Add the UST default trace dir to path. */
- memset(pathname, 0, sizeof(pathname));
- ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s",
- ua_sess->path);
- if (ret < 0) {
- PERROR("snprintf snapshot path");
- goto error;
- }
-
- cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter,
- ua_chan, node.node) {
- ret = consumer_snapshot_channel(socket, ua_chan->key, output,
- 0, ua_sess->euid, ua_sess->egid, pathname, wait,
- max_stream_size);
- if (ret < 0) {
- goto error;
- }
- }
-
- registry = get_session_registry(ua_sess);
- assert(registry);
- ret = consumer_snapshot_channel(socket, registry->metadata_key, output,
- 1, ua_sess->euid, ua_sess->egid, pathname, wait,
- max_stream_size);
- if (ret < 0) {
- goto error;
- }
- snapshot_done = 1;
- }
- break;
- }
- default:
- assert(0);
- break;
- }
-
- if (!snapshot_done) {
- /*
- * If no snapshot was made and we are not in the error path, this means
- * that there are no buffers thus no (prior) application to snapshot
- * data from so we have simply NO data.
- */
- ret = -ENODATA;
- }
-
-error:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Return the number of streams for a UST session.
- */
-unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
-{
- unsigned int ret = 0;
- struct ust_app *app;
- struct lttng_ht_iter iter;
-
- 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 *reg_chan;
-
- cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter,
- reg_chan, node.node) {
- ret += reg_chan->stream_count;
- }
- }
- 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) {
- ret += ua_chan->streams.count;
- }
- }
- rcu_read_unlock();
- break;
- }
- default:
- assert(0);
- break;
- }
-
- return ret;
-}
projects / lttng-tools.git / blobdiff