2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/types.h>
29 #include <urcu/compiler.h>
30 #include <lttng/ust-error.h>
33 #include <common/common.h>
34 #include <common/sessiond-comm/sessiond-comm.h>
36 #include "buffer-registry.h"
38 #include "health-sessiond.h"
40 #include "ust-consumer.h"
44 #include "lttng-sessiond.h"
45 #include "notification-thread-commands.h"
48 int ust_app_flush_app_session(struct ust_app
*app
, struct ust_app_session
*ua_sess
);
50 /* Next available channel key. Access under next_channel_key_lock. */
51 static uint64_t _next_channel_key
;
52 static pthread_mutex_t next_channel_key_lock
= PTHREAD_MUTEX_INITIALIZER
;
54 /* Next available session ID. Access under next_session_id_lock. */
55 static uint64_t _next_session_id
;
56 static pthread_mutex_t next_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
59 * Return the incremented value of next_channel_key.
61 static uint64_t get_next_channel_key(void)
65 pthread_mutex_lock(&next_channel_key_lock
);
66 ret
= ++_next_channel_key
;
67 pthread_mutex_unlock(&next_channel_key_lock
);
72 * Return the atomically incremented value of next_session_id.
74 static uint64_t get_next_session_id(void)
78 pthread_mutex_lock(&next_session_id_lock
);
79 ret
= ++_next_session_id
;
80 pthread_mutex_unlock(&next_session_id_lock
);
84 static void copy_channel_attr_to_ustctl(
85 struct ustctl_consumer_channel_attr
*attr
,
86 struct lttng_ust_channel_attr
*uattr
)
88 /* Copy event attributes since the layout is different. */
89 attr
->subbuf_size
= uattr
->subbuf_size
;
90 attr
->num_subbuf
= uattr
->num_subbuf
;
91 attr
->overwrite
= uattr
->overwrite
;
92 attr
->switch_timer_interval
= uattr
->switch_timer_interval
;
93 attr
->read_timer_interval
= uattr
->read_timer_interval
;
94 attr
->output
= uattr
->output
;
95 attr
->blocking_timeout
= uattr
->u
.s
.blocking_timeout
;
99 * Match function for the hash table lookup.
101 * It matches an ust app event based on three attributes which are the event
102 * name, the filter bytecode and the loglevel.
104 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
106 struct ust_app_event
*event
;
107 const struct ust_app_ht_key
*key
;
108 int ev_loglevel_value
;
113 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
115 ev_loglevel_value
= event
->attr
.loglevel
;
117 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
120 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
124 /* Event loglevel. */
125 if (ev_loglevel_value
!= key
->loglevel_type
) {
126 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
127 && key
->loglevel_type
== 0 &&
128 ev_loglevel_value
== -1) {
130 * Match is accepted. This is because on event creation, the
131 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
132 * -1 are accepted for this loglevel type since 0 is the one set by
133 * the API when receiving an enable event.
140 /* One of the filters is NULL, fail. */
141 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
145 if (key
->filter
&& event
->filter
) {
146 /* Both filters exists, check length followed by the bytecode. */
147 if (event
->filter
->len
!= key
->filter
->len
||
148 memcmp(event
->filter
->data
, key
->filter
->data
,
149 event
->filter
->len
) != 0) {
154 /* One of the exclusions is NULL, fail. */
155 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
159 if (key
->exclusion
&& event
->exclusion
) {
160 /* Both exclusions exists, check count followed by the names. */
161 if (event
->exclusion
->count
!= key
->exclusion
->count
||
162 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
163 event
->exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) != 0) {
177 * Unique add of an ust app event in the given ht. This uses the custom
178 * ht_match_ust_app_event match function and the event name as hash.
180 static void add_unique_ust_app_event(struct ust_app_channel
*ua_chan
,
181 struct ust_app_event
*event
)
183 struct cds_lfht_node
*node_ptr
;
184 struct ust_app_ht_key key
;
188 assert(ua_chan
->events
);
191 ht
= ua_chan
->events
;
192 key
.name
= event
->attr
.name
;
193 key
.filter
= event
->filter
;
194 key
.loglevel_type
= event
->attr
.loglevel
;
195 key
.exclusion
= event
->exclusion
;
197 node_ptr
= cds_lfht_add_unique(ht
->ht
,
198 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
199 ht_match_ust_app_event
, &key
, &event
->node
.node
);
200 assert(node_ptr
== &event
->node
.node
);
204 * Close the notify socket from the given RCU head object. This MUST be called
205 * through a call_rcu().
207 static void close_notify_sock_rcu(struct rcu_head
*head
)
210 struct ust_app_notify_sock_obj
*obj
=
211 caa_container_of(head
, struct ust_app_notify_sock_obj
, head
);
213 /* Must have a valid fd here. */
214 assert(obj
->fd
>= 0);
216 ret
= close(obj
->fd
);
218 ERR("close notify sock %d RCU", obj
->fd
);
220 lttng_fd_put(LTTNG_FD_APPS
, 1);
226 * Return the session registry according to the buffer type of the given
229 * A registry per UID object MUST exists before calling this function or else
230 * it assert() if not found. RCU read side lock must be acquired.
232 static struct ust_registry_session
*get_session_registry(
233 struct ust_app_session
*ua_sess
)
235 struct ust_registry_session
*registry
= NULL
;
239 switch (ua_sess
->buffer_type
) {
240 case LTTNG_BUFFER_PER_PID
:
242 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
246 registry
= reg_pid
->registry
->reg
.ust
;
249 case LTTNG_BUFFER_PER_UID
:
251 struct buffer_reg_uid
*reg_uid
= buffer_reg_uid_find(
252 ua_sess
->tracing_id
, ua_sess
->bits_per_long
, ua_sess
->uid
);
256 registry
= reg_uid
->registry
->reg
.ust
;
268 * Delete ust context safely. RCU read lock must be held before calling
272 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
,
280 pthread_mutex_lock(&app
->sock_lock
);
281 ret
= ustctl_release_object(sock
, ua_ctx
->obj
);
282 pthread_mutex_unlock(&app
->sock_lock
);
283 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
284 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
285 sock
, ua_ctx
->obj
->handle
, ret
);
293 * Delete ust app event safely. RCU read lock must be held before calling
297 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
,
304 free(ua_event
->filter
);
305 if (ua_event
->exclusion
!= NULL
)
306 free(ua_event
->exclusion
);
307 if (ua_event
->obj
!= NULL
) {
308 pthread_mutex_lock(&app
->sock_lock
);
309 ret
= ustctl_release_object(sock
, ua_event
->obj
);
310 pthread_mutex_unlock(&app
->sock_lock
);
311 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
312 ERR("UST app sock %d release event obj failed with ret %d",
321 * Release ust data object of the given stream.
323 * Return 0 on success or else a negative value.
325 static int release_ust_app_stream(int sock
, struct ust_app_stream
*stream
,
333 pthread_mutex_lock(&app
->sock_lock
);
334 ret
= ustctl_release_object(sock
, stream
->obj
);
335 pthread_mutex_unlock(&app
->sock_lock
);
336 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
337 ERR("UST app sock %d release stream obj failed with ret %d",
340 lttng_fd_put(LTTNG_FD_APPS
, 2);
348 * Delete ust app stream safely. RCU read lock must be held before calling
352 void delete_ust_app_stream(int sock
, struct ust_app_stream
*stream
,
357 (void) release_ust_app_stream(sock
, stream
, app
);
362 * We need to execute ht_destroy outside of RCU read-side critical
363 * section and outside of call_rcu thread, so we postpone its execution
364 * using ht_cleanup_push. It is simpler than to change the semantic of
365 * the many callers of delete_ust_app_session().
368 void delete_ust_app_channel_rcu(struct rcu_head
*head
)
370 struct ust_app_channel
*ua_chan
=
371 caa_container_of(head
, struct ust_app_channel
, rcu_head
);
373 ht_cleanup_push(ua_chan
->ctx
);
374 ht_cleanup_push(ua_chan
->events
);
379 * Extract the lost packet or discarded events counter when the channel is
380 * being deleted and store the value in the parent channel so we can
381 * access it from lttng list and at stop/destroy.
383 * The session list lock must be held by the caller.
386 void save_per_pid_lost_discarded_counters(struct ust_app_channel
*ua_chan
)
388 uint64_t discarded
= 0, lost
= 0;
389 struct ltt_session
*session
;
390 struct ltt_ust_channel
*uchan
;
392 if (ua_chan
->attr
.type
!= LTTNG_UST_CHAN_PER_CPU
) {
397 session
= session_find_by_id(ua_chan
->session
->tracing_id
);
398 if (!session
|| !session
->ust_session
) {
400 * Not finding the session is not an error because there are
401 * multiple ways the channels can be torn down.
403 * 1) The session daemon can initiate the destruction of the
404 * ust app session after receiving a destroy command or
405 * during its shutdown/teardown.
406 * 2) The application, since we are in per-pid tracing, is
407 * unregistering and tearing down its ust app session.
409 * Both paths are protected by the session list lock which
410 * ensures that the accounting of lost packets and discarded
411 * events is done exactly once. The session is then unpublished
412 * from the session list, resulting in this condition.
417 if (ua_chan
->attr
.overwrite
) {
418 consumer_get_lost_packets(ua_chan
->session
->tracing_id
,
419 ua_chan
->key
, session
->ust_session
->consumer
,
422 consumer_get_discarded_events(ua_chan
->session
->tracing_id
,
423 ua_chan
->key
, session
->ust_session
->consumer
,
426 uchan
= trace_ust_find_channel_by_name(
427 session
->ust_session
->domain_global
.channels
,
430 ERR("Missing UST channel to store discarded counters");
434 uchan
->per_pid_closed_app_discarded
+= discarded
;
435 uchan
->per_pid_closed_app_lost
+= lost
;
442 * Delete ust app channel safely. RCU read lock must be held before calling
445 * The session list lock must be held by the caller.
448 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
,
452 struct lttng_ht_iter iter
;
453 struct ust_app_event
*ua_event
;
454 struct ust_app_ctx
*ua_ctx
;
455 struct ust_app_stream
*stream
, *stmp
;
456 struct ust_registry_session
*registry
;
460 DBG3("UST app deleting channel %s", ua_chan
->name
);
463 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
464 cds_list_del(&stream
->list
);
465 delete_ust_app_stream(sock
, stream
, app
);
469 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
470 cds_list_del(&ua_ctx
->list
);
471 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
473 delete_ust_app_ctx(sock
, ua_ctx
, app
);
477 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
479 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
481 delete_ust_app_event(sock
, ua_event
, app
);
484 if (ua_chan
->session
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
485 /* Wipe and free registry from session registry. */
486 registry
= get_session_registry(ua_chan
->session
);
488 ust_registry_channel_del_free(registry
, ua_chan
->key
,
492 save_per_pid_lost_discarded_counters(ua_chan
);
496 if (ua_chan
->obj
!= NULL
) {
497 /* Remove channel from application UST object descriptor. */
498 iter
.iter
.node
= &ua_chan
->ust_objd_node
.node
;
499 ret
= lttng_ht_del(app
->ust_objd
, &iter
);
501 pthread_mutex_lock(&app
->sock_lock
);
502 ret
= ustctl_release_object(sock
, ua_chan
->obj
);
503 pthread_mutex_unlock(&app
->sock_lock
);
504 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
505 ERR("UST app sock %d release channel obj failed with ret %d",
508 lttng_fd_put(LTTNG_FD_APPS
, 1);
511 call_rcu(&ua_chan
->rcu_head
, delete_ust_app_channel_rcu
);
514 int ust_app_register_done(struct ust_app
*app
)
518 pthread_mutex_lock(&app
->sock_lock
);
519 ret
= ustctl_register_done(app
->sock
);
520 pthread_mutex_unlock(&app
->sock_lock
);
524 int ust_app_release_object(struct ust_app
*app
, struct lttng_ust_object_data
*data
)
529 pthread_mutex_lock(&app
->sock_lock
);
534 ret
= ustctl_release_object(sock
, data
);
536 pthread_mutex_unlock(&app
->sock_lock
);
542 * Push metadata to consumer socket.
544 * RCU read-side lock must be held to guarantee existance of socket.
545 * Must be called with the ust app session lock held.
546 * Must be called with the registry lock held.
548 * On success, return the len of metadata pushed or else a negative value.
549 * Returning a -EPIPE return value means we could not send the metadata,
550 * but it can be caused by recoverable errors (e.g. the application has
551 * terminated concurrently).
553 ssize_t
ust_app_push_metadata(struct ust_registry_session
*registry
,
554 struct consumer_socket
*socket
, int send_zero_data
)
557 char *metadata_str
= NULL
;
558 size_t len
, offset
, new_metadata_len_sent
;
560 uint64_t metadata_key
, metadata_version
;
565 metadata_key
= registry
->metadata_key
;
568 * Means that no metadata was assigned to the session. This can
569 * happens if no start has been done previously.
575 offset
= registry
->metadata_len_sent
;
576 len
= registry
->metadata_len
- registry
->metadata_len_sent
;
577 new_metadata_len_sent
= registry
->metadata_len
;
578 metadata_version
= registry
->metadata_version
;
580 DBG3("No metadata to push for metadata key %" PRIu64
,
581 registry
->metadata_key
);
583 if (send_zero_data
) {
584 DBG("No metadata to push");
590 /* Allocate only what we have to send. */
591 metadata_str
= zmalloc(len
);
593 PERROR("zmalloc ust app metadata string");
597 /* Copy what we haven't sent out. */
598 memcpy(metadata_str
, registry
->metadata
+ offset
, len
);
601 pthread_mutex_unlock(®istry
->lock
);
603 * We need to unlock the registry while we push metadata to
604 * break a circular dependency between the consumerd metadata
605 * lock and the sessiond registry lock. Indeed, pushing metadata
606 * to the consumerd awaits that it gets pushed all the way to
607 * relayd, but doing so requires grabbing the metadata lock. If
608 * a concurrent metadata request is being performed by
609 * consumerd, this can try to grab the registry lock on the
610 * sessiond while holding the metadata lock on the consumer
611 * daemon. Those push and pull schemes are performed on two
612 * different bidirectionnal communication sockets.
614 ret
= consumer_push_metadata(socket
, metadata_key
,
615 metadata_str
, len
, offset
, metadata_version
);
616 pthread_mutex_lock(®istry
->lock
);
619 * There is an acceptable race here between the registry
620 * metadata key assignment and the creation on the
621 * consumer. The session daemon can concurrently push
622 * metadata for this registry while being created on the
623 * consumer since the metadata key of the registry is
624 * assigned *before* it is setup to avoid the consumer
625 * to ask for metadata that could possibly be not found
626 * in the session daemon.
628 * The metadata will get pushed either by the session
629 * being stopped or the consumer requesting metadata if
630 * that race is triggered.
632 if (ret
== -LTTCOMM_CONSUMERD_CHANNEL_FAIL
) {
635 ERR("Error pushing metadata to consumer");
641 * Metadata may have been concurrently pushed, since
642 * we're not holding the registry lock while pushing to
643 * consumer. This is handled by the fact that we send
644 * the metadata content, size, and the offset at which
645 * that metadata belongs. This may arrive out of order
646 * on the consumer side, and the consumer is able to
647 * deal with overlapping fragments. The consumer
648 * supports overlapping fragments, which must be
649 * contiguous starting from offset 0. We keep the
650 * largest metadata_len_sent value of the concurrent
653 registry
->metadata_len_sent
=
654 max_t(size_t, registry
->metadata_len_sent
,
655 new_metadata_len_sent
);
664 * On error, flag the registry that the metadata is
665 * closed. We were unable to push anything and this
666 * means that either the consumer is not responding or
667 * the metadata cache has been destroyed on the
670 registry
->metadata_closed
= 1;
678 * For a given application and session, push metadata to consumer.
679 * Either sock or consumer is required : if sock is NULL, the default
680 * socket to send the metadata is retrieved from consumer, if sock
681 * is not NULL we use it to send the metadata.
682 * RCU read-side lock must be held while calling this function,
683 * therefore ensuring existance of registry. It also ensures existance
684 * of socket throughout this function.
686 * Return 0 on success else a negative error.
687 * Returning a -EPIPE return value means we could not send the metadata,
688 * but it can be caused by recoverable errors (e.g. the application has
689 * terminated concurrently).
691 static int push_metadata(struct ust_registry_session
*registry
,
692 struct consumer_output
*consumer
)
696 struct consumer_socket
*socket
;
701 pthread_mutex_lock(®istry
->lock
);
702 if (registry
->metadata_closed
) {
707 /* Get consumer socket to use to push the metadata.*/
708 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
715 ret
= ust_app_push_metadata(registry
, socket
, 0);
720 pthread_mutex_unlock(®istry
->lock
);
724 pthread_mutex_unlock(®istry
->lock
);
729 * Send to the consumer a close metadata command for the given session. Once
730 * done, the metadata channel is deleted and the session metadata pointer is
731 * nullified. The session lock MUST be held unless the application is
732 * in the destroy path.
734 * Return 0 on success else a negative value.
736 static int close_metadata(struct ust_registry_session
*registry
,
737 struct consumer_output
*consumer
)
740 struct consumer_socket
*socket
;
747 pthread_mutex_lock(®istry
->lock
);
749 if (!registry
->metadata_key
|| registry
->metadata_closed
) {
754 /* Get consumer socket to use to push the metadata.*/
755 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
762 ret
= consumer_close_metadata(socket
, registry
->metadata_key
);
769 * Metadata closed. Even on error this means that the consumer is not
770 * responding or not found so either way a second close should NOT be emit
773 registry
->metadata_closed
= 1;
775 pthread_mutex_unlock(®istry
->lock
);
781 * We need to execute ht_destroy outside of RCU read-side critical
782 * section and outside of call_rcu thread, so we postpone its execution
783 * using ht_cleanup_push. It is simpler than to change the semantic of
784 * the many callers of delete_ust_app_session().
787 void delete_ust_app_session_rcu(struct rcu_head
*head
)
789 struct ust_app_session
*ua_sess
=
790 caa_container_of(head
, struct ust_app_session
, rcu_head
);
792 ht_cleanup_push(ua_sess
->channels
);
797 * Delete ust app session safely. RCU read lock must be held before calling
800 * The session list lock must be held by the caller.
803 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
807 struct lttng_ht_iter iter
;
808 struct ust_app_channel
*ua_chan
;
809 struct ust_registry_session
*registry
;
813 pthread_mutex_lock(&ua_sess
->lock
);
815 assert(!ua_sess
->deleted
);
816 ua_sess
->deleted
= true;
818 registry
= get_session_registry(ua_sess
);
819 /* Registry can be null on error path during initialization. */
821 /* Push metadata for application before freeing the application. */
822 (void) push_metadata(registry
, ua_sess
->consumer
);
825 * Don't ask to close metadata for global per UID buffers. Close
826 * metadata only on destroy trace session in this case. Also, the
827 * previous push metadata could have flag the metadata registry to
828 * close so don't send a close command if closed.
830 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
831 /* And ask to close it for this session registry. */
832 (void) close_metadata(registry
, ua_sess
->consumer
);
836 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
838 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
840 delete_ust_app_channel(sock
, ua_chan
, app
);
843 /* In case of per PID, the registry is kept in the session. */
844 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
845 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
848 * Registry can be null on error path during
851 buffer_reg_pid_remove(reg_pid
);
852 buffer_reg_pid_destroy(reg_pid
);
856 if (ua_sess
->handle
!= -1) {
857 pthread_mutex_lock(&app
->sock_lock
);
858 ret
= ustctl_release_handle(sock
, ua_sess
->handle
);
859 pthread_mutex_unlock(&app
->sock_lock
);
860 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
861 ERR("UST app sock %d release session handle failed with ret %d",
864 /* Remove session from application UST object descriptor. */
865 iter
.iter
.node
= &ua_sess
->ust_objd_node
.node
;
866 ret
= lttng_ht_del(app
->ust_sessions_objd
, &iter
);
870 pthread_mutex_unlock(&ua_sess
->lock
);
872 consumer_output_put(ua_sess
->consumer
);
874 call_rcu(&ua_sess
->rcu_head
, delete_ust_app_session_rcu
);
878 * Delete a traceable application structure from the global list. Never call
879 * this function outside of a call_rcu call.
881 * RCU read side lock should _NOT_ be held when calling this function.
884 void delete_ust_app(struct ust_app
*app
)
887 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
890 * The session list lock must be held during this function to guarantee
891 * the existence of ua_sess.
894 /* Delete ust app sessions info */
899 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
901 /* Free every object in the session and the session. */
903 delete_ust_app_session(sock
, ua_sess
, app
);
907 ht_cleanup_push(app
->sessions
);
908 ht_cleanup_push(app
->ust_sessions_objd
);
909 ht_cleanup_push(app
->ust_objd
);
912 * Wait until we have deleted the application from the sock hash table
913 * before closing this socket, otherwise an application could re-use the
914 * socket ID and race with the teardown, using the same hash table entry.
916 * It's OK to leave the close in call_rcu. We want it to stay unique for
917 * all RCU readers that could run concurrently with unregister app,
918 * therefore we _need_ to only close that socket after a grace period. So
919 * it should stay in this RCU callback.
921 * This close() is a very important step of the synchronization model so
922 * every modification to this function must be carefully reviewed.
928 lttng_fd_put(LTTNG_FD_APPS
, 1);
930 DBG2("UST app pid %d deleted", app
->pid
);
932 session_unlock_list();
936 * URCU intermediate call to delete an UST app.
939 void delete_ust_app_rcu(struct rcu_head
*head
)
941 struct lttng_ht_node_ulong
*node
=
942 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
943 struct ust_app
*app
=
944 caa_container_of(node
, struct ust_app
, pid_n
);
946 DBG3("Call RCU deleting app PID %d", app
->pid
);
951 * Delete the session from the application ht and delete the data structure by
952 * freeing every object inside and releasing them.
954 * The session list lock must be held by the caller.
956 static void destroy_app_session(struct ust_app
*app
,
957 struct ust_app_session
*ua_sess
)
960 struct lttng_ht_iter iter
;
965 iter
.iter
.node
= &ua_sess
->node
.node
;
966 ret
= lttng_ht_del(app
->sessions
, &iter
);
968 /* Already scheduled for teardown. */
972 /* Once deleted, free the data structure. */
973 delete_ust_app_session(app
->sock
, ua_sess
, app
);
980 * Alloc new UST app session.
983 struct ust_app_session
*alloc_ust_app_session(struct ust_app
*app
)
985 struct ust_app_session
*ua_sess
;
987 /* Init most of the default value by allocating and zeroing */
988 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
989 if (ua_sess
== NULL
) {
994 ua_sess
->handle
= -1;
995 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
996 ua_sess
->metadata_attr
.type
= LTTNG_UST_CHAN_METADATA
;
997 pthread_mutex_init(&ua_sess
->lock
, NULL
);
1006 * Alloc new UST app channel.
1009 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
1010 struct ust_app_session
*ua_sess
,
1011 struct lttng_ust_channel_attr
*attr
)
1013 struct ust_app_channel
*ua_chan
;
1015 /* Init most of the default value by allocating and zeroing */
1016 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
1017 if (ua_chan
== NULL
) {
1022 /* Setup channel name */
1023 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
1024 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1026 ua_chan
->enabled
= 1;
1027 ua_chan
->handle
= -1;
1028 ua_chan
->session
= ua_sess
;
1029 ua_chan
->key
= get_next_channel_key();
1030 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1031 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
1032 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
1034 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
1035 CDS_INIT_LIST_HEAD(&ua_chan
->ctx_list
);
1037 /* Copy attributes */
1039 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
1040 ua_chan
->attr
.subbuf_size
= attr
->subbuf_size
;
1041 ua_chan
->attr
.num_subbuf
= attr
->num_subbuf
;
1042 ua_chan
->attr
.overwrite
= attr
->overwrite
;
1043 ua_chan
->attr
.switch_timer_interval
= attr
->switch_timer_interval
;
1044 ua_chan
->attr
.read_timer_interval
= attr
->read_timer_interval
;
1045 ua_chan
->attr
.output
= attr
->output
;
1046 ua_chan
->attr
.blocking_timeout
= attr
->u
.s
.blocking_timeout
;
1048 /* By default, the channel is a per cpu channel. */
1049 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1051 DBG3("UST app channel %s allocated", ua_chan
->name
);
1060 * Allocate and initialize a UST app stream.
1062 * Return newly allocated stream pointer or NULL on error.
1064 struct ust_app_stream
*ust_app_alloc_stream(void)
1066 struct ust_app_stream
*stream
= NULL
;
1068 stream
= zmalloc(sizeof(*stream
));
1069 if (stream
== NULL
) {
1070 PERROR("zmalloc ust app stream");
1074 /* Zero could be a valid value for a handle so flag it to -1. */
1075 stream
->handle
= -1;
1082 * Alloc new UST app event.
1085 struct ust_app_event
*alloc_ust_app_event(char *name
,
1086 struct lttng_ust_event
*attr
)
1088 struct ust_app_event
*ua_event
;
1090 /* Init most of the default value by allocating and zeroing */
1091 ua_event
= zmalloc(sizeof(struct ust_app_event
));
1092 if (ua_event
== NULL
) {
1097 ua_event
->enabled
= 1;
1098 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
1099 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1100 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
1102 /* Copy attributes */
1104 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
1107 DBG3("UST app event %s allocated", ua_event
->name
);
1116 * Alloc new UST app context.
1119 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context_attr
*uctx
)
1121 struct ust_app_ctx
*ua_ctx
;
1123 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
1124 if (ua_ctx
== NULL
) {
1128 CDS_INIT_LIST_HEAD(&ua_ctx
->list
);
1131 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
1132 if (uctx
->ctx
== LTTNG_UST_CONTEXT_APP_CONTEXT
) {
1133 char *provider_name
= NULL
, *ctx_name
= NULL
;
1135 provider_name
= strdup(uctx
->u
.app_ctx
.provider_name
);
1136 ctx_name
= strdup(uctx
->u
.app_ctx
.ctx_name
);
1137 if (!provider_name
|| !ctx_name
) {
1138 free(provider_name
);
1143 ua_ctx
->ctx
.u
.app_ctx
.provider_name
= provider_name
;
1144 ua_ctx
->ctx
.u
.app_ctx
.ctx_name
= ctx_name
;
1148 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
1156 * Allocate a filter and copy the given original filter.
1158 * Return allocated filter or NULL on error.
1160 static struct lttng_filter_bytecode
*copy_filter_bytecode(
1161 struct lttng_filter_bytecode
*orig_f
)
1163 struct lttng_filter_bytecode
*filter
= NULL
;
1165 /* Copy filter bytecode */
1166 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1168 PERROR("zmalloc alloc filter bytecode");
1172 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1179 * Create a liblttng-ust filter bytecode from given bytecode.
1181 * Return allocated filter or NULL on error.
1183 static struct lttng_ust_filter_bytecode
*create_ust_bytecode_from_bytecode(
1184 struct lttng_filter_bytecode
*orig_f
)
1186 struct lttng_ust_filter_bytecode
*filter
= NULL
;
1188 /* Copy filter bytecode */
1189 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1191 PERROR("zmalloc alloc ust filter bytecode");
1195 assert(sizeof(struct lttng_filter_bytecode
) ==
1196 sizeof(struct lttng_ust_filter_bytecode
));
1197 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1203 * Find an ust_app using the sock and return it. RCU read side lock must be
1204 * held before calling this helper function.
1206 struct ust_app
*ust_app_find_by_sock(int sock
)
1208 struct lttng_ht_node_ulong
*node
;
1209 struct lttng_ht_iter iter
;
1211 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1212 node
= lttng_ht_iter_get_node_ulong(&iter
);
1214 DBG2("UST app find by sock %d not found", sock
);
1218 return caa_container_of(node
, struct ust_app
, sock_n
);
1225 * Find an ust_app using the notify sock and return it. RCU read side lock must
1226 * be held before calling this helper function.
1228 static struct ust_app
*find_app_by_notify_sock(int sock
)
1230 struct lttng_ht_node_ulong
*node
;
1231 struct lttng_ht_iter iter
;
1233 lttng_ht_lookup(ust_app_ht_by_notify_sock
, (void *)((unsigned long) sock
),
1235 node
= lttng_ht_iter_get_node_ulong(&iter
);
1237 DBG2("UST app find by notify sock %d not found", sock
);
1241 return caa_container_of(node
, struct ust_app
, notify_sock_n
);
1248 * Lookup for an ust app event based on event name, filter bytecode and the
1251 * Return an ust_app_event object or NULL on error.
1253 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
1254 char *name
, struct lttng_filter_bytecode
*filter
,
1256 const struct lttng_event_exclusion
*exclusion
)
1258 struct lttng_ht_iter iter
;
1259 struct lttng_ht_node_str
*node
;
1260 struct ust_app_event
*event
= NULL
;
1261 struct ust_app_ht_key key
;
1266 /* Setup key for event lookup. */
1268 key
.filter
= filter
;
1269 key
.loglevel_type
= loglevel_value
;
1270 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1271 key
.exclusion
= exclusion
;
1273 /* Lookup using the event name as hash and a custom match fct. */
1274 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
1275 ht_match_ust_app_event
, &key
, &iter
.iter
);
1276 node
= lttng_ht_iter_get_node_str(&iter
);
1281 event
= caa_container_of(node
, struct ust_app_event
, node
);
1288 * Create the channel context on the tracer.
1290 * Called with UST app session lock held.
1293 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
1294 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
1298 health_code_update();
1300 pthread_mutex_lock(&app
->sock_lock
);
1301 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
1302 ua_chan
->obj
, &ua_ctx
->obj
);
1303 pthread_mutex_unlock(&app
->sock_lock
);
1305 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1306 ERR("UST app create channel context failed for app (pid: %d) "
1307 "with ret %d", app
->pid
, ret
);
1310 * This is normal behavior, an application can die during the
1311 * creation process. Don't report an error so the execution can
1312 * continue normally.
1315 DBG3("UST app disable event failed. Application is dead.");
1320 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
1322 DBG2("UST app context handle %d created successfully for channel %s",
1323 ua_ctx
->handle
, ua_chan
->name
);
1326 health_code_update();
1331 * Set the filter on the tracer.
1334 int set_ust_event_filter(struct ust_app_event
*ua_event
,
1335 struct ust_app
*app
)
1338 struct lttng_ust_filter_bytecode
*ust_bytecode
= NULL
;
1340 health_code_update();
1342 if (!ua_event
->filter
) {
1347 ust_bytecode
= create_ust_bytecode_from_bytecode(ua_event
->filter
);
1348 if (!ust_bytecode
) {
1349 ret
= -LTTNG_ERR_NOMEM
;
1352 pthread_mutex_lock(&app
->sock_lock
);
1353 ret
= ustctl_set_filter(app
->sock
, ust_bytecode
,
1355 pthread_mutex_unlock(&app
->sock_lock
);
1357 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1358 ERR("UST app event %s filter failed for app (pid: %d) "
1359 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1362 * This is normal behavior, an application can die during the
1363 * creation process. Don't report an error so the execution can
1364 * continue normally.
1367 DBG3("UST app filter event failed. Application is dead.");
1372 DBG2("UST filter set successfully for event %s", ua_event
->name
);
1375 health_code_update();
1381 struct lttng_ust_event_exclusion
*create_ust_exclusion_from_exclusion(
1382 struct lttng_event_exclusion
*exclusion
)
1384 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1385 size_t exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1386 LTTNG_UST_SYM_NAME_LEN
* exclusion
->count
;
1388 ust_exclusion
= zmalloc(exclusion_alloc_size
);
1389 if (!ust_exclusion
) {
1394 assert(sizeof(struct lttng_event_exclusion
) ==
1395 sizeof(struct lttng_ust_event_exclusion
));
1396 memcpy(ust_exclusion
, exclusion
, exclusion_alloc_size
);
1398 return ust_exclusion
;
1402 * Set event exclusions on the tracer.
1405 int set_ust_event_exclusion(struct ust_app_event
*ua_event
,
1406 struct ust_app
*app
)
1409 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1411 health_code_update();
1413 if (!ua_event
->exclusion
|| !ua_event
->exclusion
->count
) {
1418 ust_exclusion
= create_ust_exclusion_from_exclusion(
1419 ua_event
->exclusion
);
1420 if (!ust_exclusion
) {
1421 ret
= -LTTNG_ERR_NOMEM
;
1424 pthread_mutex_lock(&app
->sock_lock
);
1425 ret
= ustctl_set_exclusion(app
->sock
, ust_exclusion
, ua_event
->obj
);
1426 pthread_mutex_unlock(&app
->sock_lock
);
1428 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1429 ERR("UST app event %s exclusions failed for app (pid: %d) "
1430 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1433 * This is normal behavior, an application can die during the
1434 * creation process. Don't report an error so the execution can
1435 * continue normally.
1438 DBG3("UST app event exclusion failed. Application is dead.");
1443 DBG2("UST exclusion set successfully for event %s", ua_event
->name
);
1446 health_code_update();
1447 free(ust_exclusion
);
1452 * Disable the specified event on to UST tracer for the UST session.
1454 static int disable_ust_event(struct ust_app
*app
,
1455 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1459 health_code_update();
1461 pthread_mutex_lock(&app
->sock_lock
);
1462 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
1463 pthread_mutex_unlock(&app
->sock_lock
);
1465 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1466 ERR("UST app event %s disable failed for app (pid: %d) "
1467 "and session handle %d with ret %d",
1468 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1471 * This is normal behavior, an application can die during the
1472 * creation process. Don't report an error so the execution can
1473 * continue normally.
1476 DBG3("UST app disable event failed. Application is dead.");
1481 DBG2("UST app event %s disabled successfully for app (pid: %d)",
1482 ua_event
->attr
.name
, app
->pid
);
1485 health_code_update();
1490 * Disable the specified channel on to UST tracer for the UST session.
1492 static int disable_ust_channel(struct ust_app
*app
,
1493 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1497 health_code_update();
1499 pthread_mutex_lock(&app
->sock_lock
);
1500 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
1501 pthread_mutex_unlock(&app
->sock_lock
);
1503 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1504 ERR("UST app channel %s disable failed for app (pid: %d) "
1505 "and session handle %d with ret %d",
1506 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1509 * This is normal behavior, an application can die during the
1510 * creation process. Don't report an error so the execution can
1511 * continue normally.
1514 DBG3("UST app disable channel failed. Application is dead.");
1519 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
1520 ua_chan
->name
, app
->pid
);
1523 health_code_update();
1528 * Enable the specified channel on to UST tracer for the UST session.
1530 static int enable_ust_channel(struct ust_app
*app
,
1531 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1535 health_code_update();
1537 pthread_mutex_lock(&app
->sock_lock
);
1538 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
1539 pthread_mutex_unlock(&app
->sock_lock
);
1541 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1542 ERR("UST app channel %s enable failed for app (pid: %d) "
1543 "and session handle %d with ret %d",
1544 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1547 * This is normal behavior, an application can die during the
1548 * creation process. Don't report an error so the execution can
1549 * continue normally.
1552 DBG3("UST app enable channel failed. Application is dead.");
1557 ua_chan
->enabled
= 1;
1559 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
1560 ua_chan
->name
, app
->pid
);
1563 health_code_update();
1568 * Enable the specified event on to UST tracer for the UST session.
1570 static int enable_ust_event(struct ust_app
*app
,
1571 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1575 health_code_update();
1577 pthread_mutex_lock(&app
->sock_lock
);
1578 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
1579 pthread_mutex_unlock(&app
->sock_lock
);
1581 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1582 ERR("UST app event %s enable failed for app (pid: %d) "
1583 "and session handle %d with ret %d",
1584 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1587 * This is normal behavior, an application can die during the
1588 * creation process. Don't report an error so the execution can
1589 * continue normally.
1592 DBG3("UST app enable event failed. Application is dead.");
1597 DBG2("UST app event %s enabled successfully for app (pid: %d)",
1598 ua_event
->attr
.name
, app
->pid
);
1601 health_code_update();
1606 * Send channel and stream buffer to application.
1608 * Return 0 on success. On error, a negative value is returned.
1610 static int send_channel_pid_to_ust(struct ust_app
*app
,
1611 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1614 struct ust_app_stream
*stream
, *stmp
;
1620 health_code_update();
1622 DBG("UST app sending channel %s to UST app sock %d", ua_chan
->name
,
1625 /* Send channel to the application. */
1626 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
1627 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1628 ret
= -ENOTCONN
; /* Caused by app exiting. */
1630 } else if (ret
< 0) {
1634 health_code_update();
1636 /* Send all streams to application. */
1637 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
1638 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, stream
);
1639 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1640 ret
= -ENOTCONN
; /* Caused by app exiting. */
1642 } else if (ret
< 0) {
1645 /* We don't need the stream anymore once sent to the tracer. */
1646 cds_list_del(&stream
->list
);
1647 delete_ust_app_stream(-1, stream
, app
);
1649 /* Flag the channel that it is sent to the application. */
1650 ua_chan
->is_sent
= 1;
1653 health_code_update();
1658 * Create the specified event onto the UST tracer for a UST session.
1660 * Should be called with session mutex held.
1663 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
1664 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
1668 health_code_update();
1670 /* Create UST event on tracer */
1671 pthread_mutex_lock(&app
->sock_lock
);
1672 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
1674 pthread_mutex_unlock(&app
->sock_lock
);
1676 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1677 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1678 ua_event
->attr
.name
, app
->pid
, ret
);
1681 * This is normal behavior, an application can die during the
1682 * creation process. Don't report an error so the execution can
1683 * continue normally.
1686 DBG3("UST app create event failed. Application is dead.");
1691 ua_event
->handle
= ua_event
->obj
->handle
;
1693 DBG2("UST app event %s created successfully for pid:%d",
1694 ua_event
->attr
.name
, app
->pid
);
1696 health_code_update();
1698 /* Set filter if one is present. */
1699 if (ua_event
->filter
) {
1700 ret
= set_ust_event_filter(ua_event
, app
);
1706 /* Set exclusions for the event */
1707 if (ua_event
->exclusion
) {
1708 ret
= set_ust_event_exclusion(ua_event
, app
);
1714 /* If event not enabled, disable it on the tracer */
1715 if (ua_event
->enabled
) {
1717 * We now need to explicitly enable the event, since it
1718 * is now disabled at creation.
1720 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1723 * If we hit an EPERM, something is wrong with our enable call. If
1724 * we get an EEXIST, there is a problem on the tracer side since we
1728 case -LTTNG_UST_ERR_PERM
:
1729 /* Code flow problem */
1731 case -LTTNG_UST_ERR_EXIST
:
1732 /* It's OK for our use case. */
1743 health_code_update();
1748 * Copy data between an UST app event and a LTT event.
1750 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1751 struct ltt_ust_event
*uevent
)
1753 size_t exclusion_alloc_size
;
1755 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1756 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1758 ua_event
->enabled
= uevent
->enabled
;
1760 /* Copy event attributes */
1761 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1763 /* Copy filter bytecode */
1764 if (uevent
->filter
) {
1765 ua_event
->filter
= copy_filter_bytecode(uevent
->filter
);
1766 /* Filter might be NULL here in case of ENONEM. */
1769 /* Copy exclusion data */
1770 if (uevent
->exclusion
) {
1771 exclusion_alloc_size
= sizeof(struct lttng_event_exclusion
) +
1772 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1773 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1774 if (ua_event
->exclusion
== NULL
) {
1777 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1778 exclusion_alloc_size
);
1784 * Copy data between an UST app channel and a LTT channel.
1786 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1787 struct ltt_ust_channel
*uchan
)
1789 struct lttng_ht_iter iter
;
1790 struct ltt_ust_event
*uevent
;
1791 struct ltt_ust_context
*uctx
;
1792 struct ust_app_event
*ua_event
;
1794 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1796 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1797 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1799 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1800 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1802 /* Copy event attributes since the layout is different. */
1803 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1804 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1805 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1806 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1807 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1808 ua_chan
->monitor_timer_interval
= uchan
->monitor_timer_interval
;
1809 ua_chan
->attr
.output
= uchan
->attr
.output
;
1810 ua_chan
->attr
.blocking_timeout
= uchan
->attr
.u
.s
.blocking_timeout
;
1813 * Note that the attribute channel type is not set since the channel on the
1814 * tracing registry side does not have this information.
1817 ua_chan
->enabled
= uchan
->enabled
;
1818 ua_chan
->tracing_channel_id
= uchan
->id
;
1820 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
1821 struct ust_app_ctx
*ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
1823 if (ua_ctx
== NULL
) {
1826 lttng_ht_node_init_ulong(&ua_ctx
->node
,
1827 (unsigned long) ua_ctx
->ctx
.ctx
);
1828 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1829 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
1832 /* Copy all events from ltt ust channel to ust app channel */
1833 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
1834 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1835 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
1836 if (ua_event
== NULL
) {
1837 DBG2("UST event %s not found on shadow copy channel",
1839 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1840 if (ua_event
== NULL
) {
1843 shadow_copy_event(ua_event
, uevent
);
1844 add_unique_ust_app_event(ua_chan
, ua_event
);
1848 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1852 * Copy data between a UST app session and a regular LTT session.
1854 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1855 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1857 struct lttng_ht_node_str
*ua_chan_node
;
1858 struct lttng_ht_iter iter
;
1859 struct ltt_ust_channel
*uchan
;
1860 struct ust_app_channel
*ua_chan
;
1862 struct tm
*timeinfo
;
1865 char tmp_shm_path
[PATH_MAX
];
1867 /* Get date and time for unique app path */
1869 timeinfo
= localtime(&rawtime
);
1870 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1872 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1874 ua_sess
->tracing_id
= usess
->id
;
1875 ua_sess
->id
= get_next_session_id();
1876 ua_sess
->uid
= app
->uid
;
1877 ua_sess
->gid
= app
->gid
;
1878 ua_sess
->euid
= usess
->uid
;
1879 ua_sess
->egid
= usess
->gid
;
1880 ua_sess
->buffer_type
= usess
->buffer_type
;
1881 ua_sess
->bits_per_long
= app
->bits_per_long
;
1883 /* There is only one consumer object per session possible. */
1884 consumer_output_get(usess
->consumer
);
1885 ua_sess
->consumer
= usess
->consumer
;
1887 ua_sess
->output_traces
= usess
->output_traces
;
1888 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1889 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1890 &usess
->metadata_attr
);
1892 switch (ua_sess
->buffer_type
) {
1893 case LTTNG_BUFFER_PER_PID
:
1894 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1895 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1898 case LTTNG_BUFFER_PER_UID
:
1899 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1900 DEFAULT_UST_TRACE_UID_PATH
, ua_sess
->uid
, app
->bits_per_long
);
1907 PERROR("asprintf UST shadow copy session");
1912 strncpy(ua_sess
->root_shm_path
, usess
->root_shm_path
,
1913 sizeof(ua_sess
->root_shm_path
));
1914 ua_sess
->root_shm_path
[sizeof(ua_sess
->root_shm_path
) - 1] = '\0';
1915 strncpy(ua_sess
->shm_path
, usess
->shm_path
,
1916 sizeof(ua_sess
->shm_path
));
1917 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1918 if (ua_sess
->shm_path
[0]) {
1919 switch (ua_sess
->buffer_type
) {
1920 case LTTNG_BUFFER_PER_PID
:
1921 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1922 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s",
1923 app
->name
, app
->pid
, datetime
);
1925 case LTTNG_BUFFER_PER_UID
:
1926 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1927 DEFAULT_UST_TRACE_UID_PATH
,
1928 app
->uid
, app
->bits_per_long
);
1935 PERROR("sprintf UST shadow copy session");
1939 strncat(ua_sess
->shm_path
, tmp_shm_path
,
1940 sizeof(ua_sess
->shm_path
) - strlen(ua_sess
->shm_path
) - 1);
1941 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1944 /* Iterate over all channels in global domain. */
1945 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1947 struct lttng_ht_iter uiter
;
1949 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1950 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1951 if (ua_chan_node
!= NULL
) {
1952 /* Session exist. Contiuing. */
1956 DBG2("Channel %s not found on shadow session copy, creating it",
1958 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
,
1960 if (ua_chan
== NULL
) {
1961 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1964 shadow_copy_channel(ua_chan
, uchan
);
1966 * The concept of metadata channel does not exist on the tracing
1967 * registry side of the session daemon so this can only be a per CPU
1968 * channel and not metadata.
1970 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1972 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1977 consumer_output_put(ua_sess
->consumer
);
1981 * Lookup sesison wrapper.
1984 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1985 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1987 /* Get right UST app session from app */
1988 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
1992 * Return ust app session from the app session hashtable using the UST session
1995 static struct ust_app_session
*lookup_session_by_app(
1996 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1998 struct lttng_ht_iter iter
;
1999 struct lttng_ht_node_u64
*node
;
2001 __lookup_session_by_app(usess
, app
, &iter
);
2002 node
= lttng_ht_iter_get_node_u64(&iter
);
2007 return caa_container_of(node
, struct ust_app_session
, node
);
2014 * Setup buffer registry per PID for the given session and application. If none
2015 * is found, a new one is created, added to the global registry and
2016 * initialized. If regp is valid, it's set with the newly created object.
2018 * Return 0 on success or else a negative value.
2020 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
2021 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
2024 struct buffer_reg_pid
*reg_pid
;
2031 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
2034 * This is the create channel path meaning that if there is NO
2035 * registry available, we have to create one for this session.
2037 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
,
2038 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
2046 /* Initialize registry. */
2047 ret
= ust_registry_session_init(®_pid
->registry
->reg
.ust
, app
,
2048 app
->bits_per_long
, app
->uint8_t_alignment
,
2049 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
2050 app
->uint64_t_alignment
, app
->long_alignment
,
2051 app
->byte_order
, app
->version
.major
,
2052 app
->version
.minor
, reg_pid
->root_shm_path
,
2054 ua_sess
->euid
, ua_sess
->egid
);
2057 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2058 * destroy the buffer registry, because it is always expected
2059 * that if the buffer registry can be found, its ust registry is
2062 buffer_reg_pid_destroy(reg_pid
);
2066 buffer_reg_pid_add(reg_pid
);
2068 DBG3("UST app buffer registry per PID created successfully");
2080 * Setup buffer registry per UID for the given session and application. If none
2081 * is found, a new one is created, added to the global registry and
2082 * initialized. If regp is valid, it's set with the newly created object.
2084 * Return 0 on success or else a negative value.
2086 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
2087 struct ust_app_session
*ua_sess
,
2088 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
2091 struct buffer_reg_uid
*reg_uid
;
2098 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2101 * This is the create channel path meaning that if there is NO
2102 * registry available, we have to create one for this session.
2104 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
2105 LTTNG_DOMAIN_UST
, ®_uid
,
2106 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
2114 /* Initialize registry. */
2115 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
2116 app
->bits_per_long
, app
->uint8_t_alignment
,
2117 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
2118 app
->uint64_t_alignment
, app
->long_alignment
,
2119 app
->byte_order
, app
->version
.major
,
2120 app
->version
.minor
, reg_uid
->root_shm_path
,
2121 reg_uid
->shm_path
, usess
->uid
, usess
->gid
);
2124 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2125 * destroy the buffer registry, because it is always expected
2126 * that if the buffer registry can be found, its ust registry is
2129 buffer_reg_uid_destroy(reg_uid
, NULL
);
2132 /* Add node to teardown list of the session. */
2133 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
2135 buffer_reg_uid_add(reg_uid
);
2137 DBG3("UST app buffer registry per UID created successfully");
2148 * Create a session on the tracer side for the given app.
2150 * On success, ua_sess_ptr is populated with the session pointer or else left
2151 * untouched. If the session was created, is_created is set to 1. On error,
2152 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2155 * Returns 0 on success or else a negative code which is either -ENOMEM or
2156 * -ENOTCONN which is the default code if the ustctl_create_session fails.
2158 static int create_ust_app_session(struct ltt_ust_session
*usess
,
2159 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
2162 int ret
, created
= 0;
2163 struct ust_app_session
*ua_sess
;
2167 assert(ua_sess_ptr
);
2169 health_code_update();
2171 ua_sess
= lookup_session_by_app(usess
, app
);
2172 if (ua_sess
== NULL
) {
2173 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
2174 app
->pid
, usess
->id
);
2175 ua_sess
= alloc_ust_app_session(app
);
2176 if (ua_sess
== NULL
) {
2177 /* Only malloc can failed so something is really wrong */
2181 shadow_copy_session(ua_sess
, usess
, app
);
2185 switch (usess
->buffer_type
) {
2186 case LTTNG_BUFFER_PER_PID
:
2187 /* Init local registry. */
2188 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
2190 delete_ust_app_session(-1, ua_sess
, app
);
2194 case LTTNG_BUFFER_PER_UID
:
2195 /* Look for a global registry. If none exists, create one. */
2196 ret
= setup_buffer_reg_uid(usess
, ua_sess
, app
, NULL
);
2198 delete_ust_app_session(-1, ua_sess
, app
);
2208 health_code_update();
2210 if (ua_sess
->handle
== -1) {
2211 pthread_mutex_lock(&app
->sock_lock
);
2212 ret
= ustctl_create_session(app
->sock
);
2213 pthread_mutex_unlock(&app
->sock_lock
);
2215 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
2216 ERR("Creating session for app pid %d with ret %d",
2219 DBG("UST app creating session failed. Application is dead");
2221 * This is normal behavior, an application can die during the
2222 * creation process. Don't report an error so the execution can
2223 * continue normally. This will get flagged ENOTCONN and the
2224 * caller will handle it.
2228 delete_ust_app_session(-1, ua_sess
, app
);
2229 if (ret
!= -ENOMEM
) {
2231 * Tracer is probably gone or got an internal error so let's
2232 * behave like it will soon unregister or not usable.
2239 ua_sess
->handle
= ret
;
2241 /* Add ust app session to app's HT */
2242 lttng_ht_node_init_u64(&ua_sess
->node
,
2243 ua_sess
->tracing_id
);
2244 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
2245 lttng_ht_node_init_ulong(&ua_sess
->ust_objd_node
, ua_sess
->handle
);
2246 lttng_ht_add_unique_ulong(app
->ust_sessions_objd
,
2247 &ua_sess
->ust_objd_node
);
2249 DBG2("UST app session created successfully with handle %d", ret
);
2252 *ua_sess_ptr
= ua_sess
;
2254 *is_created
= created
;
2257 /* Everything went well. */
2261 health_code_update();
2266 * Match function for a hash table lookup of ust_app_ctx.
2268 * It matches an ust app context based on the context type and, in the case
2269 * of perf counters, their name.
2271 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
2273 struct ust_app_ctx
*ctx
;
2274 const struct lttng_ust_context_attr
*key
;
2279 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
2283 if (ctx
->ctx
.ctx
!= key
->ctx
) {
2288 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
2289 if (strncmp(key
->u
.perf_counter
.name
,
2290 ctx
->ctx
.u
.perf_counter
.name
,
2291 sizeof(key
->u
.perf_counter
.name
))) {
2295 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
2296 if (strcmp(key
->u
.app_ctx
.provider_name
,
2297 ctx
->ctx
.u
.app_ctx
.provider_name
) ||
2298 strcmp(key
->u
.app_ctx
.ctx_name
,
2299 ctx
->ctx
.u
.app_ctx
.ctx_name
)) {
2315 * Lookup for an ust app context from an lttng_ust_context.
2317 * Must be called while holding RCU read side lock.
2318 * Return an ust_app_ctx object or NULL on error.
2321 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
2322 struct lttng_ust_context_attr
*uctx
)
2324 struct lttng_ht_iter iter
;
2325 struct lttng_ht_node_ulong
*node
;
2326 struct ust_app_ctx
*app_ctx
= NULL
;
2331 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2332 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
2333 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
2334 node
= lttng_ht_iter_get_node_ulong(&iter
);
2339 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
2346 * Create a context for the channel on the tracer.
2348 * Called with UST app session lock held and a RCU read side lock.
2351 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
2352 struct ust_app_channel
*ua_chan
,
2353 struct lttng_ust_context_attr
*uctx
,
2354 struct ust_app
*app
)
2357 struct ust_app_ctx
*ua_ctx
;
2359 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2361 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2367 ua_ctx
= alloc_ust_app_ctx(uctx
);
2368 if (ua_ctx
== NULL
) {
2374 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2375 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2376 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2378 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2388 * Enable on the tracer side a ust app event for the session and channel.
2390 * Called with UST app session lock held.
2393 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2394 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2398 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2403 ua_event
->enabled
= 1;
2410 * Disable on the tracer side a ust app event for the session and channel.
2412 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2413 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2417 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2422 ua_event
->enabled
= 0;
2429 * Lookup ust app channel for session and disable it on the tracer side.
2432 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2433 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2437 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2442 ua_chan
->enabled
= 0;
2449 * Lookup ust app channel for session and enable it on the tracer side. This
2450 * MUST be called with a RCU read side lock acquired.
2452 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2453 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2456 struct lttng_ht_iter iter
;
2457 struct lttng_ht_node_str
*ua_chan_node
;
2458 struct ust_app_channel
*ua_chan
;
2460 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2461 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2462 if (ua_chan_node
== NULL
) {
2463 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2464 uchan
->name
, ua_sess
->tracing_id
);
2468 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2470 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2480 * Ask the consumer to create a channel and get it if successful.
2482 * Called with UST app session lock held.
2484 * Return 0 on success or else a negative value.
2486 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2487 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2488 int bitness
, struct ust_registry_session
*registry
)
2491 unsigned int nb_fd
= 0;
2492 struct consumer_socket
*socket
;
2500 health_code_update();
2502 /* Get the right consumer socket for the application. */
2503 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2509 health_code_update();
2511 /* Need one fd for the channel. */
2512 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2514 ERR("Exhausted number of available FD upon create channel");
2519 * Ask consumer to create channel. The consumer will return the number of
2520 * stream we have to expect.
2522 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2529 * Compute the number of fd needed before receiving them. It must be 2 per
2530 * stream (2 being the default value here).
2532 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2534 /* Reserve the amount of file descriptor we need. */
2535 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2537 ERR("Exhausted number of available FD upon create channel");
2538 goto error_fd_get_stream
;
2541 health_code_update();
2544 * Now get the channel from the consumer. This call wil populate the stream
2545 * list of that channel and set the ust objects.
2547 if (usess
->consumer
->enabled
) {
2548 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2558 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2559 error_fd_get_stream
:
2561 * Initiate a destroy channel on the consumer since we had an error
2562 * handling it on our side. The return value is of no importance since we
2563 * already have a ret value set by the previous error that we need to
2566 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2568 lttng_fd_put(LTTNG_FD_APPS
, 1);
2570 health_code_update();
2576 * Duplicate the ust data object of the ust app stream and save it in the
2577 * buffer registry stream.
2579 * Return 0 on success or else a negative value.
2581 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2582 struct ust_app_stream
*stream
)
2589 /* Reserve the amount of file descriptor we need. */
2590 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2592 ERR("Exhausted number of available FD upon duplicate stream");
2596 /* Duplicate object for stream once the original is in the registry. */
2597 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2598 reg_stream
->obj
.ust
);
2600 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2601 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2602 lttng_fd_put(LTTNG_FD_APPS
, 2);
2605 stream
->handle
= stream
->obj
->handle
;
2612 * Duplicate the ust data object of the ust app. channel and save it in the
2613 * buffer registry channel.
2615 * Return 0 on success or else a negative value.
2617 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2618 struct ust_app_channel
*ua_chan
)
2625 /* Need two fds for the channel. */
2626 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2628 ERR("Exhausted number of available FD upon duplicate channel");
2632 /* Duplicate object for stream once the original is in the registry. */
2633 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2635 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2636 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2639 ua_chan
->handle
= ua_chan
->obj
->handle
;
2644 lttng_fd_put(LTTNG_FD_APPS
, 1);
2650 * For a given channel buffer registry, setup all streams of the given ust
2651 * application channel.
2653 * Return 0 on success or else a negative value.
2655 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2656 struct ust_app_channel
*ua_chan
,
2657 struct ust_app
*app
)
2660 struct ust_app_stream
*stream
, *stmp
;
2665 DBG2("UST app setup buffer registry stream");
2667 /* Send all streams to application. */
2668 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2669 struct buffer_reg_stream
*reg_stream
;
2671 ret
= buffer_reg_stream_create(®_stream
);
2677 * Keep original pointer and nullify it in the stream so the delete
2678 * stream call does not release the object.
2680 reg_stream
->obj
.ust
= stream
->obj
;
2682 buffer_reg_stream_add(reg_stream
, reg_chan
);
2684 /* We don't need the streams anymore. */
2685 cds_list_del(&stream
->list
);
2686 delete_ust_app_stream(-1, stream
, app
);
2694 * Create a buffer registry channel for the given session registry and
2695 * application channel object. If regp pointer is valid, it's set with the
2696 * created object. Important, the created object is NOT added to the session
2697 * registry hash table.
2699 * Return 0 on success else a negative value.
2701 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2702 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2705 struct buffer_reg_channel
*reg_chan
= NULL
;
2710 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2712 /* Create buffer registry channel. */
2713 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2718 reg_chan
->consumer_key
= ua_chan
->key
;
2719 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2720 reg_chan
->num_subbuf
= ua_chan
->attr
.num_subbuf
;
2722 /* Create and add a channel registry to session. */
2723 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2724 ua_chan
->tracing_channel_id
);
2728 buffer_reg_channel_add(reg_sess
, reg_chan
);
2737 /* Safe because the registry channel object was not added to any HT. */
2738 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2744 * Setup buffer registry channel for the given session registry and application
2745 * channel object. If regp pointer is valid, it's set with the created object.
2747 * Return 0 on success else a negative value.
2749 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2750 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
,
2751 struct ust_app
*app
)
2758 assert(ua_chan
->obj
);
2760 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2762 /* Setup all streams for the registry. */
2763 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
, app
);
2768 reg_chan
->obj
.ust
= ua_chan
->obj
;
2769 ua_chan
->obj
= NULL
;
2774 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2775 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2780 * Send buffer registry channel to the application.
2782 * Return 0 on success else a negative value.
2784 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2785 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2786 struct ust_app_channel
*ua_chan
)
2789 struct buffer_reg_stream
*reg_stream
;
2796 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2798 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2803 /* Send channel to the application. */
2804 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2805 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2806 ret
= -ENOTCONN
; /* Caused by app exiting. */
2808 } else if (ret
< 0) {
2812 health_code_update();
2814 /* Send all streams to application. */
2815 pthread_mutex_lock(®_chan
->stream_list_lock
);
2816 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2817 struct ust_app_stream stream
;
2819 ret
= duplicate_stream_object(reg_stream
, &stream
);
2821 goto error_stream_unlock
;
2824 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2826 (void) release_ust_app_stream(-1, &stream
, app
);
2827 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2828 ret
= -ENOTCONN
; /* Caused by app exiting. */
2830 goto error_stream_unlock
;
2834 * The return value is not important here. This function will output an
2837 (void) release_ust_app_stream(-1, &stream
, app
);
2839 ua_chan
->is_sent
= 1;
2841 error_stream_unlock
:
2842 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2848 * Create and send to the application the created buffers with per UID buffers.
2850 * Return 0 on success else a negative value.
2852 static int create_channel_per_uid(struct ust_app
*app
,
2853 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2854 struct ust_app_channel
*ua_chan
)
2857 struct buffer_reg_uid
*reg_uid
;
2858 struct buffer_reg_channel
*reg_chan
;
2859 bool created
= false;
2866 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2868 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2870 * The session creation handles the creation of this global registry
2871 * object. If none can be find, there is a code flow problem or a
2876 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2879 /* Create the buffer registry channel object. */
2880 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2882 ERR("Error creating the UST channel \"%s\" registry instance",
2889 * Create the buffers on the consumer side. This call populates the
2890 * ust app channel object with all streams and data object.
2892 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2893 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
);
2895 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2899 * Let's remove the previously created buffer registry channel so
2900 * it's not visible anymore in the session registry.
2902 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2903 ua_chan
->tracing_channel_id
, false);
2904 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2905 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2910 * Setup the streams and add it to the session registry.
2912 ret
= setup_buffer_reg_channel(reg_uid
->registry
,
2913 ua_chan
, reg_chan
, app
);
2915 ERR("Error setting up UST channel \"%s\"",
2923 enum lttng_error_code cmd_ret
;
2924 struct ltt_session
*session
;
2925 uint64_t chan_reg_key
;
2926 struct ust_registry_channel
*chan_reg
;
2929 chan_reg_key
= ua_chan
->tracing_channel_id
;
2931 pthread_mutex_lock(®_uid
->registry
->reg
.ust
->lock
);
2932 chan_reg
= ust_registry_channel_find(reg_uid
->registry
->reg
.ust
,
2935 chan_reg
->consumer_key
= ua_chan
->key
;
2937 pthread_mutex_unlock(®_uid
->registry
->reg
.ust
->lock
);
2939 session
= session_find_by_id(ua_sess
->tracing_id
);
2942 cmd_ret
= notification_thread_command_add_channel(
2943 notification_thread_handle
, session
->name
,
2944 ua_sess
->euid
, ua_sess
->egid
,
2948 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
2950 if (cmd_ret
!= LTTNG_OK
) {
2951 ret
= - (int) cmd_ret
;
2952 ERR("Failed to add channel to notification thread");
2957 /* Send buffers to the application. */
2958 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2960 if (ret
!= -ENOTCONN
) {
2961 ERR("Error sending channel to application");
2971 * Create and send to the application the created buffers with per PID buffers.
2973 * Called with UST app session lock held.
2975 * Return 0 on success else a negative value.
2977 static int create_channel_per_pid(struct ust_app
*app
,
2978 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2979 struct ust_app_channel
*ua_chan
)
2982 struct ust_registry_session
*registry
;
2983 enum lttng_error_code cmd_ret
;
2984 struct ltt_session
*session
;
2985 uint64_t chan_reg_key
;
2986 struct ust_registry_channel
*chan_reg
;
2993 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
2997 registry
= get_session_registry(ua_sess
);
2998 /* The UST app session lock is held, registry shall not be null. */
3001 /* Create and add a new channel registry to session. */
3002 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
3004 ERR("Error creating the UST channel \"%s\" registry instance",
3009 /* Create and get channel on the consumer side. */
3010 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
3011 app
->bits_per_long
, registry
);
3013 ERR("Error creating UST channel \"%s\" on the consumer daemon",
3018 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
3020 if (ret
!= -ENOTCONN
) {
3021 ERR("Error sending channel to application");
3026 session
= session_find_by_id(ua_sess
->tracing_id
);
3029 chan_reg_key
= ua_chan
->key
;
3030 pthread_mutex_lock(®istry
->lock
);
3031 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
3033 chan_reg
->consumer_key
= ua_chan
->key
;
3034 pthread_mutex_unlock(®istry
->lock
);
3036 cmd_ret
= notification_thread_command_add_channel(
3037 notification_thread_handle
, session
->name
,
3038 ua_sess
->euid
, ua_sess
->egid
,
3042 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
3043 if (cmd_ret
!= LTTNG_OK
) {
3044 ret
= - (int) cmd_ret
;
3045 ERR("Failed to add channel to notification thread");
3055 * From an already allocated ust app channel, create the channel buffers if
3056 * need and send it to the application. This MUST be called with a RCU read
3057 * side lock acquired.
3059 * Called with UST app session lock held.
3061 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3062 * the application exited concurrently.
3064 static int do_create_channel(struct ust_app
*app
,
3065 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
3066 struct ust_app_channel
*ua_chan
)
3075 /* Handle buffer type before sending the channel to the application. */
3076 switch (usess
->buffer_type
) {
3077 case LTTNG_BUFFER_PER_UID
:
3079 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
3085 case LTTNG_BUFFER_PER_PID
:
3087 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
3099 /* Initialize ust objd object using the received handle and add it. */
3100 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
3101 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
3103 /* If channel is not enabled, disable it on the tracer */
3104 if (!ua_chan
->enabled
) {
3105 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
3116 * Create UST app channel and create it on the tracer. Set ua_chanp of the
3117 * newly created channel if not NULL.
3119 * Called with UST app session lock and RCU read-side lock held.
3121 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3122 * the application exited concurrently.
3124 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
3125 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
3126 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
3127 struct ust_app_channel
**ua_chanp
)
3130 struct lttng_ht_iter iter
;
3131 struct lttng_ht_node_str
*ua_chan_node
;
3132 struct ust_app_channel
*ua_chan
;
3134 /* Lookup channel in the ust app session */
3135 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
3136 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
3137 if (ua_chan_node
!= NULL
) {
3138 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3142 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
3143 if (ua_chan
== NULL
) {
3144 /* Only malloc can fail here */
3148 shadow_copy_channel(ua_chan
, uchan
);
3150 /* Set channel type. */
3151 ua_chan
->attr
.type
= type
;
3153 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
3158 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
3161 /* Only add the channel if successful on the tracer side. */
3162 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
3165 *ua_chanp
= ua_chan
;
3168 /* Everything went well. */
3172 delete_ust_app_channel(ua_chan
->is_sent
? app
->sock
: -1, ua_chan
, app
);
3178 * Create UST app event and create it on the tracer side.
3180 * Called with ust app session mutex held.
3183 int create_ust_app_event(struct ust_app_session
*ua_sess
,
3184 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
3185 struct ust_app
*app
)
3188 struct ust_app_event
*ua_event
;
3190 /* Get event node */
3191 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
3192 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
3193 if (ua_event
!= NULL
) {
3198 /* Does not exist so create one */
3199 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
3200 if (ua_event
== NULL
) {
3201 /* Only malloc can failed so something is really wrong */
3205 shadow_copy_event(ua_event
, uevent
);
3207 /* Create it on the tracer side */
3208 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
3210 /* Not found previously means that it does not exist on the tracer */
3211 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
3215 add_unique_ust_app_event(ua_chan
, ua_event
);
3217 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
3224 /* Valid. Calling here is already in a read side lock */
3225 delete_ust_app_event(-1, ua_event
, app
);
3230 * Create UST metadata and open it on the tracer side.
3232 * Called with UST app session lock held and RCU read side lock.
3234 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
3235 struct ust_app
*app
, struct consumer_output
*consumer
)
3238 struct ust_app_channel
*metadata
;
3239 struct consumer_socket
*socket
;
3240 struct ust_registry_session
*registry
;
3246 registry
= get_session_registry(ua_sess
);
3247 /* The UST app session is held registry shall not be null. */
3250 pthread_mutex_lock(®istry
->lock
);
3252 /* Metadata already exists for this registry or it was closed previously */
3253 if (registry
->metadata_key
|| registry
->metadata_closed
) {
3258 /* Allocate UST metadata */
3259 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
3261 /* malloc() failed */
3266 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
3268 /* Need one fd for the channel. */
3269 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
3271 ERR("Exhausted number of available FD upon create metadata");
3275 /* Get the right consumer socket for the application. */
3276 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
3279 goto error_consumer
;
3283 * Keep metadata key so we can identify it on the consumer side. Assign it
3284 * to the registry *before* we ask the consumer so we avoid the race of the
3285 * consumer requesting the metadata and the ask_channel call on our side
3286 * did not returned yet.
3288 registry
->metadata_key
= metadata
->key
;
3291 * Ask the metadata channel creation to the consumer. The metadata object
3292 * will be created by the consumer and kept their. However, the stream is
3293 * never added or monitored until we do a first push metadata to the
3296 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
3299 /* Nullify the metadata key so we don't try to close it later on. */
3300 registry
->metadata_key
= 0;
3301 goto error_consumer
;
3305 * The setup command will make the metadata stream be sent to the relayd,
3306 * if applicable, and the thread managing the metadatas. This is important
3307 * because after this point, if an error occurs, the only way the stream
3308 * can be deleted is to be monitored in the consumer.
3310 ret
= consumer_setup_metadata(socket
, metadata
->key
);
3312 /* Nullify the metadata key so we don't try to close it later on. */
3313 registry
->metadata_key
= 0;
3314 goto error_consumer
;
3317 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
3318 metadata
->key
, app
->pid
);
3321 lttng_fd_put(LTTNG_FD_APPS
, 1);
3322 delete_ust_app_channel(-1, metadata
, app
);
3324 pthread_mutex_unlock(®istry
->lock
);
3329 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
3330 * acquired before calling this function.
3332 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
3334 struct ust_app
*app
= NULL
;
3335 struct lttng_ht_node_ulong
*node
;
3336 struct lttng_ht_iter iter
;
3338 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
3339 node
= lttng_ht_iter_get_node_ulong(&iter
);
3341 DBG2("UST app no found with pid %d", pid
);
3345 DBG2("Found UST app by pid %d", pid
);
3347 app
= caa_container_of(node
, struct ust_app
, pid_n
);
3354 * Allocate and init an UST app object using the registration information and
3355 * the command socket. This is called when the command socket connects to the
3358 * The object is returned on success or else NULL.
3360 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
3362 struct ust_app
*lta
= NULL
;
3367 DBG3("UST app creating application for socket %d", sock
);
3369 if ((msg
->bits_per_long
== 64 &&
3370 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
3371 || (msg
->bits_per_long
== 32 &&
3372 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
3373 ERR("Registration failed: application \"%s\" (pid: %d) has "
3374 "%d-bit long, but no consumerd for this size is available.\n",
3375 msg
->name
, msg
->pid
, msg
->bits_per_long
);
3379 lta
= zmalloc(sizeof(struct ust_app
));
3385 lta
->ppid
= msg
->ppid
;
3386 lta
->uid
= msg
->uid
;
3387 lta
->gid
= msg
->gid
;
3389 lta
->bits_per_long
= msg
->bits_per_long
;
3390 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
3391 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
3392 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
3393 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
3394 lta
->long_alignment
= msg
->long_alignment
;
3395 lta
->byte_order
= msg
->byte_order
;
3397 lta
->v_major
= msg
->major
;
3398 lta
->v_minor
= msg
->minor
;
3399 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3400 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3401 lta
->ust_sessions_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3402 lta
->notify_sock
= -1;
3404 /* Copy name and make sure it's NULL terminated. */
3405 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
3406 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
3409 * Before this can be called, when receiving the registration information,
3410 * the application compatibility is checked. So, at this point, the
3411 * application can work with this session daemon.
3413 lta
->compatible
= 1;
3415 lta
->pid
= msg
->pid
;
3416 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
3418 pthread_mutex_init(<a
->sock_lock
, NULL
);
3419 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
3421 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
3427 * For a given application object, add it to every hash table.
3429 void ust_app_add(struct ust_app
*app
)
3432 assert(app
->notify_sock
>= 0);
3437 * On a re-registration, we want to kick out the previous registration of
3440 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3443 * The socket _should_ be unique until _we_ call close. So, a add_unique
3444 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3445 * already in the table.
3447 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3449 /* Add application to the notify socket hash table. */
3450 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3451 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3453 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3454 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3455 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3462 * Set the application version into the object.
3464 * Return 0 on success else a negative value either an errno code or a
3465 * LTTng-UST error code.
3467 int ust_app_version(struct ust_app
*app
)
3473 pthread_mutex_lock(&app
->sock_lock
);
3474 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3475 pthread_mutex_unlock(&app
->sock_lock
);
3477 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3478 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3480 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3488 * Unregister app by removing it from the global traceable app list and freeing
3491 * The socket is already closed at this point so no close to sock.
3493 void ust_app_unregister(int sock
)
3495 struct ust_app
*lta
;
3496 struct lttng_ht_node_ulong
*node
;
3497 struct lttng_ht_iter ust_app_sock_iter
;
3498 struct lttng_ht_iter iter
;
3499 struct ust_app_session
*ua_sess
;
3504 /* Get the node reference for a call_rcu */
3505 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &ust_app_sock_iter
);
3506 node
= lttng_ht_iter_get_node_ulong(&ust_app_sock_iter
);
3509 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3510 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3513 * For per-PID buffers, perform "push metadata" and flush all
3514 * application streams before removing app from hash tables,
3515 * ensuring proper behavior of data_pending check.
3516 * Remove sessions so they are not visible during deletion.
3518 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3520 struct ust_registry_session
*registry
;
3522 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3524 /* The session was already removed so scheduled for teardown. */
3528 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
3529 (void) ust_app_flush_app_session(lta
, ua_sess
);
3533 * Add session to list for teardown. This is safe since at this point we
3534 * are the only one using this list.
3536 pthread_mutex_lock(&ua_sess
->lock
);
3538 if (ua_sess
->deleted
) {
3539 pthread_mutex_unlock(&ua_sess
->lock
);
3544 * Normally, this is done in the delete session process which is
3545 * executed in the call rcu below. However, upon registration we can't
3546 * afford to wait for the grace period before pushing data or else the
3547 * data pending feature can race between the unregistration and stop
3548 * command where the data pending command is sent *before* the grace
3551 * The close metadata below nullifies the metadata pointer in the
3552 * session so the delete session will NOT push/close a second time.
3554 registry
= get_session_registry(ua_sess
);
3556 /* Push metadata for application before freeing the application. */
3557 (void) push_metadata(registry
, ua_sess
->consumer
);
3560 * Don't ask to close metadata for global per UID buffers. Close
3561 * metadata only on destroy trace session in this case. Also, the
3562 * previous push metadata could have flag the metadata registry to
3563 * close so don't send a close command if closed.
3565 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
3566 /* And ask to close it for this session registry. */
3567 (void) close_metadata(registry
, ua_sess
->consumer
);
3570 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3572 pthread_mutex_unlock(&ua_sess
->lock
);
3575 /* Remove application from PID hash table */
3576 ret
= lttng_ht_del(ust_app_ht_by_sock
, &ust_app_sock_iter
);
3580 * Remove application from notify hash table. The thread handling the
3581 * notify socket could have deleted the node so ignore on error because
3582 * either way it's valid. The close of that socket is handled by the other
3585 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3586 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3589 * Ignore return value since the node might have been removed before by an
3590 * add replace during app registration because the PID can be reassigned by
3593 iter
.iter
.node
= <a
->pid_n
.node
;
3594 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3596 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3601 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3608 * Fill events array with all events name of all registered apps.
3610 int ust_app_list_events(struct lttng_event
**events
)
3613 size_t nbmem
, count
= 0;
3614 struct lttng_ht_iter iter
;
3615 struct ust_app
*app
;
3616 struct lttng_event
*tmp_event
;
3618 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3619 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3620 if (tmp_event
== NULL
) {
3621 PERROR("zmalloc ust app events");
3628 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3629 struct lttng_ust_tracepoint_iter uiter
;
3631 health_code_update();
3633 if (!app
->compatible
) {
3635 * TODO: In time, we should notice the caller of this error by
3636 * telling him that this is a version error.
3640 pthread_mutex_lock(&app
->sock_lock
);
3641 handle
= ustctl_tracepoint_list(app
->sock
);
3643 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3644 ERR("UST app list events getting handle failed for app pid %d",
3647 pthread_mutex_unlock(&app
->sock_lock
);
3651 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3652 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3653 /* Handle ustctl error. */
3657 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3658 ERR("UST app tp list get failed for app %d with ret %d",
3661 DBG3("UST app tp list get failed. Application is dead");
3663 * This is normal behavior, an application can die during the
3664 * creation process. Don't report an error so the execution can
3665 * continue normally. Continue normal execution.
3670 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3671 if (release_ret
< 0 &&
3672 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3673 release_ret
!= -EPIPE
) {
3674 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3676 pthread_mutex_unlock(&app
->sock_lock
);
3680 health_code_update();
3681 if (count
>= nbmem
) {
3682 /* In case the realloc fails, we free the memory */
3683 struct lttng_event
*new_tmp_event
;
3686 new_nbmem
= nbmem
<< 1;
3687 DBG2("Reallocating event list from %zu to %zu entries",
3689 new_tmp_event
= realloc(tmp_event
,
3690 new_nbmem
* sizeof(struct lttng_event
));
3691 if (new_tmp_event
== NULL
) {
3694 PERROR("realloc ust app events");
3697 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3698 if (release_ret
< 0 &&
3699 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3700 release_ret
!= -EPIPE
) {
3701 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3703 pthread_mutex_unlock(&app
->sock_lock
);
3706 /* Zero the new memory */
3707 memset(new_tmp_event
+ nbmem
, 0,
3708 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3710 tmp_event
= new_tmp_event
;
3712 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3713 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3714 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3715 tmp_event
[count
].pid
= app
->pid
;
3716 tmp_event
[count
].enabled
= -1;
3719 ret
= ustctl_release_handle(app
->sock
, handle
);
3720 pthread_mutex_unlock(&app
->sock_lock
);
3721 if (ret
< 0 && ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3722 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3727 *events
= tmp_event
;
3729 DBG2("UST app list events done (%zu events)", count
);
3734 health_code_update();
3739 * Fill events array with all events name of all registered apps.
3741 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3744 size_t nbmem
, count
= 0;
3745 struct lttng_ht_iter iter
;
3746 struct ust_app
*app
;
3747 struct lttng_event_field
*tmp_event
;
3749 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3750 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3751 if (tmp_event
== NULL
) {
3752 PERROR("zmalloc ust app event fields");
3759 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3760 struct lttng_ust_field_iter uiter
;
3762 health_code_update();
3764 if (!app
->compatible
) {
3766 * TODO: In time, we should notice the caller of this error by
3767 * telling him that this is a version error.
3771 pthread_mutex_lock(&app
->sock_lock
);
3772 handle
= ustctl_tracepoint_field_list(app
->sock
);
3774 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3775 ERR("UST app list field getting handle failed for app pid %d",
3778 pthread_mutex_unlock(&app
->sock_lock
);
3782 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3783 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3784 /* Handle ustctl error. */
3788 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3789 ERR("UST app tp list field failed for app %d with ret %d",
3792 DBG3("UST app tp list field failed. Application is dead");
3794 * This is normal behavior, an application can die during the
3795 * creation process. Don't report an error so the execution can
3796 * continue normally. Reset list and count for next app.
3801 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3802 pthread_mutex_unlock(&app
->sock_lock
);
3803 if (release_ret
< 0 &&
3804 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3805 release_ret
!= -EPIPE
) {
3806 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3811 health_code_update();
3812 if (count
>= nbmem
) {
3813 /* In case the realloc fails, we free the memory */
3814 struct lttng_event_field
*new_tmp_event
;
3817 new_nbmem
= nbmem
<< 1;
3818 DBG2("Reallocating event field list from %zu to %zu entries",
3820 new_tmp_event
= realloc(tmp_event
,
3821 new_nbmem
* sizeof(struct lttng_event_field
));
3822 if (new_tmp_event
== NULL
) {
3825 PERROR("realloc ust app event fields");
3828 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3829 pthread_mutex_unlock(&app
->sock_lock
);
3831 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3832 release_ret
!= -EPIPE
) {
3833 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3837 /* Zero the new memory */
3838 memset(new_tmp_event
+ nbmem
, 0,
3839 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3841 tmp_event
= new_tmp_event
;
3844 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3845 /* Mapping between these enums matches 1 to 1. */
3846 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3847 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3849 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3850 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3851 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3852 tmp_event
[count
].event
.pid
= app
->pid
;
3853 tmp_event
[count
].event
.enabled
= -1;
3856 ret
= ustctl_release_handle(app
->sock
, handle
);
3857 pthread_mutex_unlock(&app
->sock_lock
);
3859 ret
!= -LTTNG_UST_ERR_EXITING
&&
3861 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3866 *fields
= tmp_event
;
3868 DBG2("UST app list event fields done (%zu events)", count
);
3873 health_code_update();
3878 * Free and clean all traceable apps of the global list.
3880 * Should _NOT_ be called with RCU read-side lock held.
3882 void ust_app_clean_list(void)
3885 struct ust_app
*app
;
3886 struct lttng_ht_iter iter
;
3888 DBG2("UST app cleaning registered apps hash table");
3893 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3894 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3896 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3900 /* Cleanup socket hash table */
3901 if (ust_app_ht_by_sock
) {
3902 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3904 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3909 /* Cleanup notify socket hash table */
3910 if (ust_app_ht_by_notify_sock
) {
3911 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3912 notify_sock_n
.node
) {
3913 ret
= lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3919 /* Destroy is done only when the ht is empty */
3921 ht_cleanup_push(ust_app_ht
);
3923 if (ust_app_ht_by_sock
) {
3924 ht_cleanup_push(ust_app_ht_by_sock
);
3926 if (ust_app_ht_by_notify_sock
) {
3927 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3932 * Init UST app hash table.
3934 int ust_app_ht_alloc(void)
3936 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3940 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3941 if (!ust_app_ht_by_sock
) {
3944 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3945 if (!ust_app_ht_by_notify_sock
) {
3952 * For a specific UST session, disable the channel for all registered apps.
3954 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3955 struct ltt_ust_channel
*uchan
)
3958 struct lttng_ht_iter iter
;
3959 struct lttng_ht_node_str
*ua_chan_node
;
3960 struct ust_app
*app
;
3961 struct ust_app_session
*ua_sess
;
3962 struct ust_app_channel
*ua_chan
;
3964 if (usess
== NULL
|| uchan
== NULL
) {
3965 ERR("Disabling UST global channel with NULL values");
3970 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3971 uchan
->name
, usess
->id
);
3975 /* For every registered applications */
3976 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3977 struct lttng_ht_iter uiter
;
3978 if (!app
->compatible
) {
3980 * TODO: In time, we should notice the caller of this error by
3981 * telling him that this is a version error.
3985 ua_sess
= lookup_session_by_app(usess
, app
);
3986 if (ua_sess
== NULL
) {
3991 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3992 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3993 /* If the session if found for the app, the channel must be there */
3994 assert(ua_chan_node
);
3996 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3997 /* The channel must not be already disabled */
3998 assert(ua_chan
->enabled
== 1);
4000 /* Disable channel onto application */
4001 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
4003 /* XXX: We might want to report this error at some point... */
4015 * For a specific UST session, enable the channel for all registered apps.
4017 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
4018 struct ltt_ust_channel
*uchan
)
4021 struct lttng_ht_iter iter
;
4022 struct ust_app
*app
;
4023 struct ust_app_session
*ua_sess
;
4025 if (usess
== NULL
|| uchan
== NULL
) {
4026 ERR("Adding UST global channel to NULL values");
4031 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
4032 uchan
->name
, usess
->id
);
4036 /* For every registered applications */
4037 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4038 if (!app
->compatible
) {
4040 * TODO: In time, we should notice the caller of this error by
4041 * telling him that this is a version error.
4045 ua_sess
= lookup_session_by_app(usess
, app
);
4046 if (ua_sess
== NULL
) {
4050 /* Enable channel onto application */
4051 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
4053 /* XXX: We might want to report this error at some point... */
4065 * Disable an event in a channel and for a specific session.
4067 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
4068 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4071 struct lttng_ht_iter iter
, uiter
;
4072 struct lttng_ht_node_str
*ua_chan_node
;
4073 struct ust_app
*app
;
4074 struct ust_app_session
*ua_sess
;
4075 struct ust_app_channel
*ua_chan
;
4076 struct ust_app_event
*ua_event
;
4078 DBG("UST app disabling event %s for all apps in channel "
4079 "%s for session id %" PRIu64
,
4080 uevent
->attr
.name
, uchan
->name
, usess
->id
);
4084 /* For all registered applications */
4085 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4086 if (!app
->compatible
) {
4088 * TODO: In time, we should notice the caller of this error by
4089 * telling him that this is a version error.
4093 ua_sess
= lookup_session_by_app(usess
, app
);
4094 if (ua_sess
== NULL
) {
4099 /* Lookup channel in the ust app session */
4100 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4101 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4102 if (ua_chan_node
== NULL
) {
4103 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
4104 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
4107 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4109 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4110 uevent
->filter
, uevent
->attr
.loglevel
,
4112 if (ua_event
== NULL
) {
4113 DBG2("Event %s not found in channel %s for app pid %d."
4114 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
4118 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
4120 /* XXX: Report error someday... */
4131 * For a specific UST session, create the channel for all registered apps.
4133 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
4134 struct ltt_ust_channel
*uchan
)
4136 int ret
= 0, created
;
4137 struct lttng_ht_iter iter
;
4138 struct ust_app
*app
;
4139 struct ust_app_session
*ua_sess
= NULL
;
4141 /* Very wrong code flow */
4145 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64
,
4146 uchan
->name
, usess
->id
);
4150 /* For every registered applications */
4151 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4152 if (!app
->compatible
) {
4154 * TODO: In time, we should notice the caller of this error by
4155 * telling him that this is a version error.
4159 if (!trace_ust_pid_tracker_lookup(usess
, app
->pid
)) {
4165 * Create session on the tracer side and add it to app session HT. Note
4166 * that if session exist, it will simply return a pointer to the ust
4169 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
4174 * The application's socket is not valid. Either a bad socket
4175 * or a timeout on it. We can't inform the caller that for a
4176 * specific app, the session failed so lets continue here.
4178 ret
= 0; /* Not an error. */
4182 goto error_rcu_unlock
;
4187 pthread_mutex_lock(&ua_sess
->lock
);
4189 if (ua_sess
->deleted
) {
4190 pthread_mutex_unlock(&ua_sess
->lock
);
4194 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
4195 sizeof(uchan
->name
))) {
4196 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
, &uchan
->attr
);
4199 /* Create channel onto application. We don't need the chan ref. */
4200 ret
= create_ust_app_channel(ua_sess
, uchan
, app
,
4201 LTTNG_UST_CHAN_PER_CPU
, usess
, NULL
);
4203 pthread_mutex_unlock(&ua_sess
->lock
);
4205 /* Cleanup the created session if it's the case. */
4207 destroy_app_session(app
, ua_sess
);
4212 * The application's socket is not valid. Either a bad socket
4213 * or a timeout on it. We can't inform the caller that for a
4214 * specific app, the session failed so lets continue here.
4216 ret
= 0; /* Not an error. */
4220 goto error_rcu_unlock
;
4231 * Enable event for a specific session and channel on the tracer.
4233 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
4234 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4237 struct lttng_ht_iter iter
, uiter
;
4238 struct lttng_ht_node_str
*ua_chan_node
;
4239 struct ust_app
*app
;
4240 struct ust_app_session
*ua_sess
;
4241 struct ust_app_channel
*ua_chan
;
4242 struct ust_app_event
*ua_event
;
4244 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
4245 uevent
->attr
.name
, usess
->id
);
4248 * NOTE: At this point, this function is called only if the session and
4249 * channel passed are already created for all apps. and enabled on the
4255 /* For all registered applications */
4256 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4257 if (!app
->compatible
) {
4259 * TODO: In time, we should notice the caller of this error by
4260 * telling him that this is a version error.
4264 ua_sess
= lookup_session_by_app(usess
, app
);
4266 /* The application has problem or is probably dead. */
4270 pthread_mutex_lock(&ua_sess
->lock
);
4272 if (ua_sess
->deleted
) {
4273 pthread_mutex_unlock(&ua_sess
->lock
);
4277 /* Lookup channel in the ust app session */
4278 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4279 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4281 * It is possible that the channel cannot be found is
4282 * the channel/event creation occurs concurrently with
4283 * an application exit.
4285 if (!ua_chan_node
) {
4286 pthread_mutex_unlock(&ua_sess
->lock
);
4290 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4292 /* Get event node */
4293 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4294 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4295 if (ua_event
== NULL
) {
4296 DBG3("UST app enable event %s not found for app PID %d."
4297 "Skipping app", uevent
->attr
.name
, app
->pid
);
4301 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4303 pthread_mutex_unlock(&ua_sess
->lock
);
4307 pthread_mutex_unlock(&ua_sess
->lock
);
4316 * For a specific existing UST session and UST channel, creates the event for
4317 * all registered apps.
4319 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
4320 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4323 struct lttng_ht_iter iter
, uiter
;
4324 struct lttng_ht_node_str
*ua_chan_node
;
4325 struct ust_app
*app
;
4326 struct ust_app_session
*ua_sess
;
4327 struct ust_app_channel
*ua_chan
;
4329 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
4330 uevent
->attr
.name
, usess
->id
);
4334 /* For all registered applications */
4335 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4336 if (!app
->compatible
) {
4338 * TODO: In time, we should notice the caller of this error by
4339 * telling him that this is a version error.
4343 ua_sess
= lookup_session_by_app(usess
, app
);
4345 /* The application has problem or is probably dead. */
4349 pthread_mutex_lock(&ua_sess
->lock
);
4351 if (ua_sess
->deleted
) {
4352 pthread_mutex_unlock(&ua_sess
->lock
);
4356 /* Lookup channel in the ust app session */
4357 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4358 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4359 /* If the channel is not found, there is a code flow error */
4360 assert(ua_chan_node
);
4362 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4364 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4365 pthread_mutex_unlock(&ua_sess
->lock
);
4367 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
4368 /* Possible value at this point: -ENOMEM. If so, we stop! */
4371 DBG2("UST app event %s already exist on app PID %d",
4372 uevent
->attr
.name
, app
->pid
);
4383 * Start tracing for a specific UST session and app.
4385 * Called with UST app session lock held.
4389 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4392 struct ust_app_session
*ua_sess
;
4394 DBG("Starting tracing for ust app pid %d", app
->pid
);
4398 if (!app
->compatible
) {
4402 ua_sess
= lookup_session_by_app(usess
, app
);
4403 if (ua_sess
== NULL
) {
4404 /* The session is in teardown process. Ignore and continue. */
4408 pthread_mutex_lock(&ua_sess
->lock
);
4410 if (ua_sess
->deleted
) {
4411 pthread_mutex_unlock(&ua_sess
->lock
);
4415 /* Upon restart, we skip the setup, already done */
4416 if (ua_sess
->started
) {
4420 /* Create directories if consumer is LOCAL and has a path defined. */
4421 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
4422 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
4423 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
4424 S_IRWXU
| S_IRWXG
, ua_sess
->euid
, ua_sess
->egid
);
4426 if (errno
!= EEXIST
) {
4427 ERR("Trace directory creation error");
4434 * Create the metadata for the application. This returns gracefully if a
4435 * metadata was already set for the session.
4437 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
4442 health_code_update();
4445 /* This start the UST tracing */
4446 pthread_mutex_lock(&app
->sock_lock
);
4447 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
4448 pthread_mutex_unlock(&app
->sock_lock
);
4450 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4451 ERR("Error starting tracing for app pid: %d (ret: %d)",
4454 DBG("UST app start session failed. Application is dead.");
4456 * This is normal behavior, an application can die during the
4457 * creation process. Don't report an error so the execution can
4458 * continue normally.
4460 pthread_mutex_unlock(&ua_sess
->lock
);
4466 /* Indicate that the session has been started once */
4467 ua_sess
->started
= 1;
4469 pthread_mutex_unlock(&ua_sess
->lock
);
4471 health_code_update();
4473 /* Quiescent wait after starting trace */
4474 pthread_mutex_lock(&app
->sock_lock
);
4475 ret
= ustctl_wait_quiescent(app
->sock
);
4476 pthread_mutex_unlock(&app
->sock_lock
);
4477 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4478 ERR("UST app wait quiescent failed for app pid %d ret %d",
4484 health_code_update();
4488 pthread_mutex_unlock(&ua_sess
->lock
);
4490 health_code_update();
4495 * Stop tracing for a specific UST session and app.
4498 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4501 struct ust_app_session
*ua_sess
;
4502 struct ust_registry_session
*registry
;
4504 DBG("Stopping tracing for ust app pid %d", app
->pid
);
4508 if (!app
->compatible
) {
4509 goto end_no_session
;
4512 ua_sess
= lookup_session_by_app(usess
, app
);
4513 if (ua_sess
== NULL
) {
4514 goto end_no_session
;
4517 pthread_mutex_lock(&ua_sess
->lock
);
4519 if (ua_sess
->deleted
) {
4520 pthread_mutex_unlock(&ua_sess
->lock
);
4521 goto end_no_session
;
4525 * If started = 0, it means that stop trace has been called for a session
4526 * that was never started. It's possible since we can have a fail start
4527 * from either the application manager thread or the command thread. Simply
4528 * indicate that this is a stop error.
4530 if (!ua_sess
->started
) {
4531 goto error_rcu_unlock
;
4534 health_code_update();
4536 /* This inhibits UST tracing */
4537 pthread_mutex_lock(&app
->sock_lock
);
4538 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
4539 pthread_mutex_unlock(&app
->sock_lock
);
4541 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4542 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4545 DBG("UST app stop session failed. Application is dead.");
4547 * This is normal behavior, an application can die during the
4548 * creation process. Don't report an error so the execution can
4549 * continue normally.
4553 goto error_rcu_unlock
;
4556 health_code_update();
4558 /* Quiescent wait after stopping trace */
4559 pthread_mutex_lock(&app
->sock_lock
);
4560 ret
= ustctl_wait_quiescent(app
->sock
);
4561 pthread_mutex_unlock(&app
->sock_lock
);
4562 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4563 ERR("UST app wait quiescent failed for app pid %d ret %d",
4567 health_code_update();
4569 registry
= get_session_registry(ua_sess
);
4571 /* The UST app session is held registry shall not be null. */
4574 /* Push metadata for application before freeing the application. */
4575 (void) push_metadata(registry
, ua_sess
->consumer
);
4578 pthread_mutex_unlock(&ua_sess
->lock
);
4581 health_code_update();
4585 pthread_mutex_unlock(&ua_sess
->lock
);
4587 health_code_update();
4592 int ust_app_flush_app_session(struct ust_app
*app
,
4593 struct ust_app_session
*ua_sess
)
4595 int ret
, retval
= 0;
4596 struct lttng_ht_iter iter
;
4597 struct ust_app_channel
*ua_chan
;
4598 struct consumer_socket
*socket
;
4600 DBG("Flushing app session buffers for ust app pid %d", app
->pid
);
4604 if (!app
->compatible
) {
4605 goto end_not_compatible
;
4608 pthread_mutex_lock(&ua_sess
->lock
);
4610 if (ua_sess
->deleted
) {
4614 health_code_update();
4616 /* Flushing buffers */
4617 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4620 /* Flush buffers and push metadata. */
4621 switch (ua_sess
->buffer_type
) {
4622 case LTTNG_BUFFER_PER_PID
:
4623 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4625 health_code_update();
4626 ret
= consumer_flush_channel(socket
, ua_chan
->key
);
4628 ERR("Error flushing consumer channel");
4634 case LTTNG_BUFFER_PER_UID
:
4640 health_code_update();
4643 pthread_mutex_unlock(&ua_sess
->lock
);
4647 health_code_update();
4652 * Flush buffers for all applications for a specific UST session.
4653 * Called with UST session lock held.
4656 int ust_app_flush_session(struct ltt_ust_session
*usess
)
4661 DBG("Flushing session buffers for all ust apps");
4665 /* Flush buffers and push metadata. */
4666 switch (usess
->buffer_type
) {
4667 case LTTNG_BUFFER_PER_UID
:
4669 struct buffer_reg_uid
*reg
;
4670 struct lttng_ht_iter iter
;
4672 /* Flush all per UID buffers associated to that session. */
4673 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4674 struct ust_registry_session
*ust_session_reg
;
4675 struct buffer_reg_channel
*reg_chan
;
4676 struct consumer_socket
*socket
;
4678 /* Get consumer socket to use to push the metadata.*/
4679 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4682 /* Ignore request if no consumer is found for the session. */
4686 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4687 reg_chan
, node
.node
) {
4689 * The following call will print error values so the return
4690 * code is of little importance because whatever happens, we
4691 * have to try them all.
4693 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4696 ust_session_reg
= reg
->registry
->reg
.ust
;
4697 /* Push metadata. */
4698 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4702 case LTTNG_BUFFER_PER_PID
:
4704 struct ust_app_session
*ua_sess
;
4705 struct lttng_ht_iter iter
;
4706 struct ust_app
*app
;
4708 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4709 ua_sess
= lookup_session_by_app(usess
, app
);
4710 if (ua_sess
== NULL
) {
4713 (void) ust_app_flush_app_session(app
, ua_sess
);
4724 health_code_update();
4729 int ust_app_clear_quiescent_app_session(struct ust_app
*app
,
4730 struct ust_app_session
*ua_sess
)
4733 struct lttng_ht_iter iter
;
4734 struct ust_app_channel
*ua_chan
;
4735 struct consumer_socket
*socket
;
4737 DBG("Clearing stream quiescent state for ust app pid %d", app
->pid
);
4741 if (!app
->compatible
) {
4742 goto end_not_compatible
;
4745 pthread_mutex_lock(&ua_sess
->lock
);
4747 if (ua_sess
->deleted
) {
4751 health_code_update();
4753 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4756 ERR("Failed to find consumer (%" PRIu32
") socket",
4757 app
->bits_per_long
);
4762 /* Clear quiescent state. */
4763 switch (ua_sess
->buffer_type
) {
4764 case LTTNG_BUFFER_PER_PID
:
4765 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
,
4766 ua_chan
, node
.node
) {
4767 health_code_update();
4768 ret
= consumer_clear_quiescent_channel(socket
,
4771 ERR("Error clearing quiescent state for consumer channel");
4777 case LTTNG_BUFFER_PER_UID
:
4784 health_code_update();
4787 pthread_mutex_unlock(&ua_sess
->lock
);
4791 health_code_update();
4796 * Clear quiescent state in each stream for all applications for a
4797 * specific UST session.
4798 * Called with UST session lock held.
4801 int ust_app_clear_quiescent_session(struct ltt_ust_session
*usess
)
4806 DBG("Clearing stream quiescent state for all ust apps");
4810 switch (usess
->buffer_type
) {
4811 case LTTNG_BUFFER_PER_UID
:
4813 struct lttng_ht_iter iter
;
4814 struct buffer_reg_uid
*reg
;
4817 * Clear quiescent for all per UID buffers associated to
4820 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4821 struct consumer_socket
*socket
;
4822 struct buffer_reg_channel
*reg_chan
;
4824 /* Get associated consumer socket.*/
4825 socket
= consumer_find_socket_by_bitness(
4826 reg
->bits_per_long
, usess
->consumer
);
4829 * Ignore request if no consumer is found for
4835 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
,
4836 &iter
.iter
, reg_chan
, node
.node
) {
4838 * The following call will print error values so
4839 * the return code is of little importance
4840 * because whatever happens, we have to try them
4843 (void) consumer_clear_quiescent_channel(socket
,
4844 reg_chan
->consumer_key
);
4849 case LTTNG_BUFFER_PER_PID
:
4851 struct ust_app_session
*ua_sess
;
4852 struct lttng_ht_iter iter
;
4853 struct ust_app
*app
;
4855 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
,
4857 ua_sess
= lookup_session_by_app(usess
, app
);
4858 if (ua_sess
== NULL
) {
4861 (void) ust_app_clear_quiescent_app_session(app
,
4873 health_code_update();
4878 * Destroy a specific UST session in apps.
4880 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4883 struct ust_app_session
*ua_sess
;
4884 struct lttng_ht_iter iter
;
4885 struct lttng_ht_node_u64
*node
;
4887 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4891 if (!app
->compatible
) {
4895 __lookup_session_by_app(usess
, app
, &iter
);
4896 node
= lttng_ht_iter_get_node_u64(&iter
);
4898 /* Session is being or is deleted. */
4901 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4903 health_code_update();
4904 destroy_app_session(app
, ua_sess
);
4906 health_code_update();
4908 /* Quiescent wait after stopping trace */
4909 pthread_mutex_lock(&app
->sock_lock
);
4910 ret
= ustctl_wait_quiescent(app
->sock
);
4911 pthread_mutex_unlock(&app
->sock_lock
);
4912 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4913 ERR("UST app wait quiescent failed for app pid %d ret %d",
4918 health_code_update();
4923 * Start tracing for the UST session.
4925 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4928 struct lttng_ht_iter iter
;
4929 struct ust_app
*app
;
4931 DBG("Starting all UST traces");
4936 * In a start-stop-start use-case, we need to clear the quiescent state
4937 * of each channel set by the prior stop command, thus ensuring that a
4938 * following stop or destroy is sure to grab a timestamp_end near those
4939 * operations, even if the packet is empty.
4941 (void) ust_app_clear_quiescent_session(usess
);
4943 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4944 ret
= ust_app_start_trace(usess
, app
);
4946 /* Continue to next apps even on error */
4957 * Start tracing for the UST session.
4958 * Called with UST session lock held.
4960 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4963 struct lttng_ht_iter iter
;
4964 struct ust_app
*app
;
4966 DBG("Stopping all UST traces");
4970 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4971 ret
= ust_app_stop_trace(usess
, app
);
4973 /* Continue to next apps even on error */
4978 (void) ust_app_flush_session(usess
);
4986 * Destroy app UST session.
4988 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
4991 struct lttng_ht_iter iter
;
4992 struct ust_app
*app
;
4994 DBG("Destroy all UST traces");
4998 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4999 ret
= destroy_trace(usess
, app
);
5001 /* Continue to next apps even on error */
5012 void ust_app_global_create(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5015 struct lttng_ht_iter iter
, uiter
;
5016 struct ust_app_session
*ua_sess
= NULL
;
5017 struct ust_app_channel
*ua_chan
;
5018 struct ust_app_event
*ua_event
;
5019 struct ust_app_ctx
*ua_ctx
;
5022 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &is_created
);
5024 /* Tracer is probably gone or ENOMEM. */
5028 /* App session already created. */
5033 pthread_mutex_lock(&ua_sess
->lock
);
5035 if (ua_sess
->deleted
) {
5036 pthread_mutex_unlock(&ua_sess
->lock
);
5041 * We can iterate safely here over all UST app session since the create ust
5042 * app session above made a shadow copy of the UST global domain from the
5045 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
5047 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
5048 if (ret
< 0 && ret
!= -ENOTCONN
) {
5050 * Stop everything. On error, the application
5051 * failed, no more file descriptor are available
5052 * or ENOMEM so stopping here is the only thing
5053 * we can do for now. The only exception is
5054 * -ENOTCONN, which indicates that the application
5061 * Add context using the list so they are enabled in the same order the
5064 cds_list_for_each_entry(ua_ctx
, &ua_chan
->ctx_list
, list
) {
5065 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
5072 /* For each events */
5073 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
5075 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
5082 pthread_mutex_unlock(&ua_sess
->lock
);
5084 if (usess
->active
) {
5085 ret
= ust_app_start_trace(usess
, app
);
5090 DBG2("UST trace started for app pid %d", app
->pid
);
5093 /* Everything went well at this point. */
5097 pthread_mutex_unlock(&ua_sess
->lock
);
5100 destroy_app_session(app
, ua_sess
);
5106 void ust_app_global_destroy(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5108 struct ust_app_session
*ua_sess
;
5110 ua_sess
= lookup_session_by_app(usess
, app
);
5111 if (ua_sess
== NULL
) {
5114 destroy_app_session(app
, ua_sess
);
5118 * Add channels/events from UST global domain to registered apps at sock.
5120 * Called with session lock held.
5121 * Called with RCU read-side lock held.
5123 void ust_app_global_update(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5127 DBG2("UST app global update for app sock %d for session id %" PRIu64
,
5128 app
->sock
, usess
->id
);
5130 if (!app
->compatible
) {
5134 if (trace_ust_pid_tracker_lookup(usess
, app
->pid
)) {
5135 ust_app_global_create(usess
, app
);
5137 ust_app_global_destroy(usess
, app
);
5142 * Called with session lock held.
5144 void ust_app_global_update_all(struct ltt_ust_session
*usess
)
5146 struct lttng_ht_iter iter
;
5147 struct ust_app
*app
;
5150 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5151 ust_app_global_update(usess
, app
);
5157 * Add context to a specific channel for global UST domain.
5159 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
5160 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
5163 struct lttng_ht_node_str
*ua_chan_node
;
5164 struct lttng_ht_iter iter
, uiter
;
5165 struct ust_app_channel
*ua_chan
= NULL
;
5166 struct ust_app_session
*ua_sess
;
5167 struct ust_app
*app
;
5171 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5172 if (!app
->compatible
) {
5174 * TODO: In time, we should notice the caller of this error by
5175 * telling him that this is a version error.
5179 ua_sess
= lookup_session_by_app(usess
, app
);
5180 if (ua_sess
== NULL
) {
5184 pthread_mutex_lock(&ua_sess
->lock
);
5186 if (ua_sess
->deleted
) {
5187 pthread_mutex_unlock(&ua_sess
->lock
);
5191 /* Lookup channel in the ust app session */
5192 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
5193 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
5194 if (ua_chan_node
== NULL
) {
5197 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
5199 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
5204 pthread_mutex_unlock(&ua_sess
->lock
);
5212 * Enable event for a channel from a UST session for a specific PID.
5214 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
5215 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
5218 struct lttng_ht_iter iter
;
5219 struct lttng_ht_node_str
*ua_chan_node
;
5220 struct ust_app
*app
;
5221 struct ust_app_session
*ua_sess
;
5222 struct ust_app_channel
*ua_chan
;
5223 struct ust_app_event
*ua_event
;
5225 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
5229 app
= ust_app_find_by_pid(pid
);
5231 ERR("UST app enable event per PID %d not found", pid
);
5236 if (!app
->compatible
) {
5241 ua_sess
= lookup_session_by_app(usess
, app
);
5243 /* The application has problem or is probably dead. */
5248 pthread_mutex_lock(&ua_sess
->lock
);
5250 if (ua_sess
->deleted
) {
5255 /* Lookup channel in the ust app session */
5256 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
5257 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
5258 /* If the channel is not found, there is a code flow error */
5259 assert(ua_chan_node
);
5261 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
5263 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
5264 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
5265 if (ua_event
== NULL
) {
5266 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
5271 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
5278 pthread_mutex_unlock(&ua_sess
->lock
);
5285 * Receive registration and populate the given msg structure.
5287 * On success return 0 else a negative value returned by the ustctl call.
5289 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
5292 uint32_t pid
, ppid
, uid
, gid
;
5296 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
5297 &pid
, &ppid
, &uid
, &gid
,
5298 &msg
->bits_per_long
,
5299 &msg
->uint8_t_alignment
,
5300 &msg
->uint16_t_alignment
,
5301 &msg
->uint32_t_alignment
,
5302 &msg
->uint64_t_alignment
,
5303 &msg
->long_alignment
,
5310 case LTTNG_UST_ERR_EXITING
:
5311 DBG3("UST app recv reg message failed. Application died");
5313 case LTTNG_UST_ERR_UNSUP_MAJOR
:
5314 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
5315 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
5316 LTTNG_UST_ABI_MINOR_VERSION
);
5319 ERR("UST app recv reg message failed with ret %d", ret
);
5324 msg
->pid
= (pid_t
) pid
;
5325 msg
->ppid
= (pid_t
) ppid
;
5326 msg
->uid
= (uid_t
) uid
;
5327 msg
->gid
= (gid_t
) gid
;
5334 * Return a ust app session object using the application object and the
5335 * session object descriptor has a key. If not found, NULL is returned.
5336 * A RCU read side lock MUST be acquired when calling this function.
5338 static struct ust_app_session
*find_session_by_objd(struct ust_app
*app
,
5341 struct lttng_ht_node_ulong
*node
;
5342 struct lttng_ht_iter iter
;
5343 struct ust_app_session
*ua_sess
= NULL
;
5347 lttng_ht_lookup(app
->ust_sessions_objd
, (void *)((unsigned long) objd
), &iter
);
5348 node
= lttng_ht_iter_get_node_ulong(&iter
);
5350 DBG2("UST app session find by objd %d not found", objd
);
5354 ua_sess
= caa_container_of(node
, struct ust_app_session
, ust_objd_node
);
5361 * Return a ust app channel object using the application object and the channel
5362 * object descriptor has a key. If not found, NULL is returned. A RCU read side
5363 * lock MUST be acquired before calling this function.
5365 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
5368 struct lttng_ht_node_ulong
*node
;
5369 struct lttng_ht_iter iter
;
5370 struct ust_app_channel
*ua_chan
= NULL
;
5374 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
5375 node
= lttng_ht_iter_get_node_ulong(&iter
);
5377 DBG2("UST app channel find by objd %d not found", objd
);
5381 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
5388 * Reply to a register channel notification from an application on the notify
5389 * socket. The channel metadata is also created.
5391 * The session UST registry lock is acquired in this function.
5393 * On success 0 is returned else a negative value.
5395 static int reply_ust_register_channel(int sock
, int sobjd
, int cobjd
,
5396 size_t nr_fields
, struct ustctl_field
*fields
)
5398 int ret
, ret_code
= 0;
5400 uint64_t chan_reg_key
;
5401 enum ustctl_channel_header type
;
5402 struct ust_app
*app
;
5403 struct ust_app_channel
*ua_chan
;
5404 struct ust_app_session
*ua_sess
;
5405 struct ust_registry_session
*registry
;
5406 struct ust_registry_channel
*chan_reg
;
5410 /* Lookup application. If not found, there is a code flow error. */
5411 app
= find_app_by_notify_sock(sock
);
5413 DBG("Application socket %d is being torn down. Abort event notify",
5416 goto error_rcu_unlock
;
5419 /* Lookup channel by UST object descriptor. */
5420 ua_chan
= find_channel_by_objd(app
, cobjd
);
5422 DBG("Application channel is being torn down. Abort event notify");
5424 goto error_rcu_unlock
;
5427 assert(ua_chan
->session
);
5428 ua_sess
= ua_chan
->session
;
5430 /* Get right session registry depending on the session buffer type. */
5431 registry
= get_session_registry(ua_sess
);
5433 DBG("Application session is being torn down. Abort event notify");
5435 goto error_rcu_unlock
;
5438 /* Depending on the buffer type, a different channel key is used. */
5439 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5440 chan_reg_key
= ua_chan
->tracing_channel_id
;
5442 chan_reg_key
= ua_chan
->key
;
5445 pthread_mutex_lock(®istry
->lock
);
5447 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
5450 if (!chan_reg
->register_done
) {
5452 * TODO: eventually use the registry event count for
5453 * this channel to better guess header type for per-pid
5456 type
= USTCTL_CHANNEL_HEADER_LARGE
;
5457 chan_reg
->nr_ctx_fields
= nr_fields
;
5458 chan_reg
->ctx_fields
= fields
;
5460 chan_reg
->header_type
= type
;
5462 /* Get current already assigned values. */
5463 type
= chan_reg
->header_type
;
5465 /* Channel id is set during the object creation. */
5466 chan_id
= chan_reg
->chan_id
;
5468 /* Append to metadata */
5469 if (!chan_reg
->metadata_dumped
) {
5470 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
5472 ERR("Error appending channel metadata (errno = %d)", ret_code
);
5478 DBG3("UST app replying to register channel key %" PRIu64
5479 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
5482 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
5484 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5485 ERR("UST app reply channel failed with ret %d", ret
);
5487 DBG3("UST app reply channel failed. Application died");
5492 /* This channel registry registration is completed. */
5493 chan_reg
->register_done
= 1;
5496 pthread_mutex_unlock(®istry
->lock
);
5504 * Add event to the UST channel registry. When the event is added to the
5505 * registry, the metadata is also created. Once done, this replies to the
5506 * application with the appropriate error code.
5508 * The session UST registry lock is acquired in the function.
5510 * On success 0 is returned else a negative value.
5512 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
5513 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
,
5514 int loglevel_value
, char *model_emf_uri
)
5517 uint32_t event_id
= 0;
5518 uint64_t chan_reg_key
;
5519 struct ust_app
*app
;
5520 struct ust_app_channel
*ua_chan
;
5521 struct ust_app_session
*ua_sess
;
5522 struct ust_registry_session
*registry
;
5526 /* Lookup application. If not found, there is a code flow error. */
5527 app
= find_app_by_notify_sock(sock
);
5529 DBG("Application socket %d is being torn down. Abort event notify",
5532 goto error_rcu_unlock
;
5535 /* Lookup channel by UST object descriptor. */
5536 ua_chan
= find_channel_by_objd(app
, cobjd
);
5538 DBG("Application channel is being torn down. Abort event notify");
5540 goto error_rcu_unlock
;
5543 assert(ua_chan
->session
);
5544 ua_sess
= ua_chan
->session
;
5546 registry
= get_session_registry(ua_sess
);
5548 DBG("Application session is being torn down. Abort event notify");
5550 goto error_rcu_unlock
;
5553 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5554 chan_reg_key
= ua_chan
->tracing_channel_id
;
5556 chan_reg_key
= ua_chan
->key
;
5559 pthread_mutex_lock(®istry
->lock
);
5562 * From this point on, this call acquires the ownership of the sig, fields
5563 * and model_emf_uri meaning any free are done inside it if needed. These
5564 * three variables MUST NOT be read/write after this.
5566 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
5567 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
,
5568 loglevel_value
, model_emf_uri
, ua_sess
->buffer_type
,
5572 model_emf_uri
= NULL
;
5575 * The return value is returned to ustctl so in case of an error, the
5576 * application can be notified. In case of an error, it's important not to
5577 * return a negative error or else the application will get closed.
5579 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
5581 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5582 ERR("UST app reply event failed with ret %d", ret
);
5584 DBG3("UST app reply event failed. Application died");
5587 * No need to wipe the create event since the application socket will
5588 * get close on error hence cleaning up everything by itself.
5593 DBG3("UST registry event %s with id %" PRId32
" added successfully",
5597 pthread_mutex_unlock(®istry
->lock
);
5602 free(model_emf_uri
);
5607 * Add enum to the UST session registry. Once done, this replies to the
5608 * application with the appropriate error code.
5610 * The session UST registry lock is acquired within this function.
5612 * On success 0 is returned else a negative value.
5614 static int add_enum_ust_registry(int sock
, int sobjd
, char *name
,
5615 struct ustctl_enum_entry
*entries
, size_t nr_entries
)
5617 int ret
= 0, ret_code
;
5618 struct ust_app
*app
;
5619 struct ust_app_session
*ua_sess
;
5620 struct ust_registry_session
*registry
;
5621 uint64_t enum_id
= -1ULL;
5625 /* Lookup application. If not found, there is a code flow error. */
5626 app
= find_app_by_notify_sock(sock
);
5628 /* Return an error since this is not an error */
5629 DBG("Application socket %d is being torn down. Aborting enum registration",
5632 goto error_rcu_unlock
;
5635 /* Lookup session by UST object descriptor. */
5636 ua_sess
= find_session_by_objd(app
, sobjd
);
5638 /* Return an error since this is not an error */
5639 DBG("Application session is being torn down (session not found). Aborting enum registration.");
5641 goto error_rcu_unlock
;
5644 registry
= get_session_registry(ua_sess
);
5646 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
5648 goto error_rcu_unlock
;
5651 pthread_mutex_lock(®istry
->lock
);
5654 * From this point on, the callee acquires the ownership of
5655 * entries. The variable entries MUST NOT be read/written after
5658 ret_code
= ust_registry_create_or_find_enum(registry
, sobjd
, name
,
5659 entries
, nr_entries
, &enum_id
);
5663 * The return value is returned to ustctl so in case of an error, the
5664 * application can be notified. In case of an error, it's important not to
5665 * return a negative error or else the application will get closed.
5667 ret
= ustctl_reply_register_enum(sock
, enum_id
, ret_code
);
5669 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5670 ERR("UST app reply enum failed with ret %d", ret
);
5672 DBG3("UST app reply enum failed. Application died");
5675 * No need to wipe the create enum since the application socket will
5676 * get close on error hence cleaning up everything by itself.
5681 DBG3("UST registry enum %s added successfully or already found", name
);
5684 pthread_mutex_unlock(®istry
->lock
);
5691 * Handle application notification through the given notify socket.
5693 * Return 0 on success or else a negative value.
5695 int ust_app_recv_notify(int sock
)
5698 enum ustctl_notify_cmd cmd
;
5700 DBG3("UST app receiving notify from sock %d", sock
);
5702 ret
= ustctl_recv_notify(sock
, &cmd
);
5704 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5705 ERR("UST app recv notify failed with ret %d", ret
);
5707 DBG3("UST app recv notify failed. Application died");
5713 case USTCTL_NOTIFY_CMD_EVENT
:
5715 int sobjd
, cobjd
, loglevel_value
;
5716 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
5718 struct ustctl_field
*fields
;
5720 DBG2("UST app ustctl register event received");
5722 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
,
5723 &loglevel_value
, &sig
, &nr_fields
, &fields
,
5726 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5727 ERR("UST app recv event failed with ret %d", ret
);
5729 DBG3("UST app recv event failed. Application died");
5735 * Add event to the UST registry coming from the notify socket. This
5736 * call will free if needed the sig, fields and model_emf_uri. This
5737 * code path loses the ownsership of these variables and transfer them
5738 * to the this function.
5740 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
5741 fields
, loglevel_value
, model_emf_uri
);
5748 case USTCTL_NOTIFY_CMD_CHANNEL
:
5752 struct ustctl_field
*fields
;
5754 DBG2("UST app ustctl register channel received");
5756 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
5759 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5760 ERR("UST app recv channel failed with ret %d", ret
);
5762 DBG3("UST app recv channel failed. Application died");
5768 * The fields ownership are transfered to this function call meaning
5769 * that if needed it will be freed. After this, it's invalid to access
5770 * fields or clean it up.
5772 ret
= reply_ust_register_channel(sock
, sobjd
, cobjd
, nr_fields
,
5780 case USTCTL_NOTIFY_CMD_ENUM
:
5783 char name
[LTTNG_UST_SYM_NAME_LEN
];
5785 struct ustctl_enum_entry
*entries
;
5787 DBG2("UST app ustctl register enum received");
5789 ret
= ustctl_recv_register_enum(sock
, &sobjd
, name
,
5790 &entries
, &nr_entries
);
5792 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5793 ERR("UST app recv enum failed with ret %d", ret
);
5795 DBG3("UST app recv enum failed. Application died");
5800 /* Callee assumes ownership of entries */
5801 ret
= add_enum_ust_registry(sock
, sobjd
, name
,
5802 entries
, nr_entries
);
5810 /* Should NEVER happen. */
5819 * Once the notify socket hangs up, this is called. First, it tries to find the
5820 * corresponding application. On failure, the call_rcu to close the socket is
5821 * executed. If an application is found, it tries to delete it from the notify
5822 * socket hash table. Whathever the result, it proceeds to the call_rcu.
5824 * Note that an object needs to be allocated here so on ENOMEM failure, the
5825 * call RCU is not done but the rest of the cleanup is.
5827 void ust_app_notify_sock_unregister(int sock
)
5830 struct lttng_ht_iter iter
;
5831 struct ust_app
*app
;
5832 struct ust_app_notify_sock_obj
*obj
;
5838 obj
= zmalloc(sizeof(*obj
));
5841 * An ENOMEM is kind of uncool. If this strikes we continue the
5842 * procedure but the call_rcu will not be called. In this case, we
5843 * accept the fd leak rather than possibly creating an unsynchronized
5844 * state between threads.
5846 * TODO: The notify object should be created once the notify socket is
5847 * registered and stored independantely from the ust app object. The
5848 * tricky part is to synchronize the teardown of the application and
5849 * this notify object. Let's keep that in mind so we can avoid this
5850 * kind of shenanigans with ENOMEM in the teardown path.
5857 DBG("UST app notify socket unregister %d", sock
);
5860 * Lookup application by notify socket. If this fails, this means that the
5861 * hash table delete has already been done by the application
5862 * unregistration process so we can safely close the notify socket in a
5865 app
= find_app_by_notify_sock(sock
);
5870 iter
.iter
.node
= &app
->notify_sock_n
.node
;
5873 * Whatever happens here either we fail or succeed, in both cases we have
5874 * to close the socket after a grace period to continue to the call RCU
5875 * here. If the deletion is successful, the application is not visible
5876 * anymore by other threads and is it fails it means that it was already
5877 * deleted from the hash table so either way we just have to close the
5880 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
5886 * Close socket after a grace period to avoid for the socket to be reused
5887 * before the application object is freed creating potential race between
5888 * threads trying to add unique in the global hash table.
5891 call_rcu(&obj
->head
, close_notify_sock_rcu
);
5896 * Destroy a ust app data structure and free its memory.
5898 void ust_app_destroy(struct ust_app
*app
)
5904 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
5908 * Take a snapshot for a given UST session. The snapshot is sent to the given
5911 * Return 0 on success or else a negative value.
5913 int ust_app_snapshot_record(struct ltt_ust_session
*usess
,
5914 struct snapshot_output
*output
, int wait
,
5915 uint64_t nb_packets_per_stream
)
5918 struct lttng_ht_iter iter
;
5919 struct ust_app
*app
;
5920 char pathname
[PATH_MAX
];
5927 switch (usess
->buffer_type
) {
5928 case LTTNG_BUFFER_PER_UID
:
5930 struct buffer_reg_uid
*reg
;
5932 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5933 struct buffer_reg_channel
*reg_chan
;
5934 struct consumer_socket
*socket
;
5936 if (!reg
->registry
->reg
.ust
->metadata_key
) {
5937 /* Skip since no metadata is present */
5941 /* Get consumer socket to use to push the metadata.*/
5942 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5949 memset(pathname
, 0, sizeof(pathname
));
5950 ret
= snprintf(pathname
, sizeof(pathname
),
5951 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5952 reg
->uid
, reg
->bits_per_long
);
5954 PERROR("snprintf snapshot path");
5958 /* Add the UST default trace dir to path. */
5959 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5960 reg_chan
, node
.node
) {
5961 ret
= consumer_snapshot_channel(socket
, reg_chan
->consumer_key
,
5962 output
, 0, usess
->uid
, usess
->gid
, pathname
, wait
,
5963 nb_packets_per_stream
);
5968 ret
= consumer_snapshot_channel(socket
,
5969 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5970 usess
->uid
, usess
->gid
, pathname
, wait
, 0);
5977 case LTTNG_BUFFER_PER_PID
:
5979 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5980 struct consumer_socket
*socket
;
5981 struct lttng_ht_iter chan_iter
;
5982 struct ust_app_channel
*ua_chan
;
5983 struct ust_app_session
*ua_sess
;
5984 struct ust_registry_session
*registry
;
5986 ua_sess
= lookup_session_by_app(usess
, app
);
5988 /* Session not associated with this app. */
5992 /* Get the right consumer socket for the application. */
5993 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
6000 /* Add the UST default trace dir to path. */
6001 memset(pathname
, 0, sizeof(pathname
));
6002 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
6005 PERROR("snprintf snapshot path");
6009 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6010 ua_chan
, node
.node
) {
6011 ret
= consumer_snapshot_channel(socket
, ua_chan
->key
, output
,
6012 0, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
6013 nb_packets_per_stream
);
6019 registry
= get_session_registry(ua_sess
);
6021 DBG("Application session is being torn down. Abort snapshot record.");
6025 ret
= consumer_snapshot_channel(socket
, registry
->metadata_key
, output
,
6026 1, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
, 0);
6044 * Return the size taken by one more packet per stream.
6046 uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session
*usess
,
6047 uint64_t cur_nr_packets
)
6049 uint64_t tot_size
= 0;
6050 struct ust_app
*app
;
6051 struct lttng_ht_iter iter
;
6055 switch (usess
->buffer_type
) {
6056 case LTTNG_BUFFER_PER_UID
:
6058 struct buffer_reg_uid
*reg
;
6060 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6061 struct buffer_reg_channel
*reg_chan
;
6064 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
6065 reg_chan
, node
.node
) {
6066 if (cur_nr_packets
>= reg_chan
->num_subbuf
) {
6068 * Don't take channel into account if we
6069 * already grab all its packets.
6073 tot_size
+= reg_chan
->subbuf_size
* reg_chan
->stream_count
;
6079 case LTTNG_BUFFER_PER_PID
:
6082 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6083 struct ust_app_channel
*ua_chan
;
6084 struct ust_app_session
*ua_sess
;
6085 struct lttng_ht_iter chan_iter
;
6087 ua_sess
= lookup_session_by_app(usess
, app
);
6089 /* Session not associated with this app. */
6093 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6094 ua_chan
, node
.node
) {
6095 if (cur_nr_packets
>= ua_chan
->attr
.num_subbuf
) {
6097 * Don't take channel into account if we
6098 * already grab all its packets.
6102 tot_size
+= ua_chan
->attr
.subbuf_size
* ua_chan
->streams
.count
;
6116 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id
,
6117 struct cds_list_head
*buffer_reg_uid_list
,
6118 struct consumer_output
*consumer
, uint64_t uchan_id
,
6119 int overwrite
, uint64_t *discarded
, uint64_t *lost
)
6122 uint64_t consumer_chan_key
;
6127 ret
= buffer_reg_uid_consumer_channel_key(
6128 buffer_reg_uid_list
, ust_session_id
,
6129 uchan_id
, &consumer_chan_key
);
6137 ret
= consumer_get_lost_packets(ust_session_id
,
6138 consumer_chan_key
, consumer
, lost
);
6140 ret
= consumer_get_discarded_events(ust_session_id
,
6141 consumer_chan_key
, consumer
, discarded
);
6148 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session
*usess
,
6149 struct ltt_ust_channel
*uchan
,
6150 struct consumer_output
*consumer
, int overwrite
,
6151 uint64_t *discarded
, uint64_t *lost
)
6154 struct lttng_ht_iter iter
;
6155 struct lttng_ht_node_str
*ua_chan_node
;
6156 struct ust_app
*app
;
6157 struct ust_app_session
*ua_sess
;
6158 struct ust_app_channel
*ua_chan
;
6165 * Iterate over every registered applications. Sum counters for
6166 * all applications containing requested session and channel.
6168 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6169 struct lttng_ht_iter uiter
;
6171 ua_sess
= lookup_session_by_app(usess
, app
);
6172 if (ua_sess
== NULL
) {
6177 lttng_ht_lookup(ua_sess
->channels
, (void *) uchan
->name
, &uiter
);
6178 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
6179 /* If the session is found for the app, the channel must be there */
6180 assert(ua_chan_node
);
6182 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
6187 ret
= consumer_get_lost_packets(usess
->id
, ua_chan
->key
,
6194 uint64_t _discarded
;
6196 ret
= consumer_get_discarded_events(usess
->id
,
6197 ua_chan
->key
, consumer
, &_discarded
);
6201 (*discarded
) += _discarded
;
6210 int ust_app_regenerate_statedump(struct ltt_ust_session
*usess
,
6211 struct ust_app
*app
)
6214 struct ust_app_session
*ua_sess
;
6216 DBG("Regenerating the metadata for ust app pid %d", app
->pid
);
6220 ua_sess
= lookup_session_by_app(usess
, app
);
6221 if (ua_sess
== NULL
) {
6222 /* The session is in teardown process. Ignore and continue. */
6226 pthread_mutex_lock(&ua_sess
->lock
);
6228 if (ua_sess
->deleted
) {
6232 pthread_mutex_lock(&app
->sock_lock
);
6233 ret
= ustctl_regenerate_statedump(app
->sock
, ua_sess
->handle
);
6234 pthread_mutex_unlock(&app
->sock_lock
);
6237 pthread_mutex_unlock(&ua_sess
->lock
);
6241 health_code_update();
6246 * Regenerate the statedump for each app in the session.
6248 int ust_app_regenerate_statedump_all(struct ltt_ust_session
*usess
)
6251 struct lttng_ht_iter iter
;
6252 struct ust_app
*app
;
6254 DBG("Regenerating the metadata for all UST apps");
6258 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6259 if (!app
->compatible
) {
6263 ret
= ust_app_regenerate_statedump(usess
, app
);
6265 /* Continue to the next app even on error */