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>
32 #include <common/common.h>
33 #include <common/sessiond-comm/sessiond-comm.h>
35 #include "buffer-registry.h"
37 #include "health-sessiond.h"
39 #include "ust-consumer.h"
40 #include "lttng-ust-ctl.h"
41 #include "lttng-ust-error.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 * Do not hold the registry lock while communicating with the consumerd, because
735 * doing so causes inter-process deadlocks between consumerd and sessiond with
736 * the metadata request notification.
738 * Return 0 on success else a negative value.
740 static int close_metadata(struct ust_registry_session
*registry
,
741 struct consumer_output
*consumer
)
744 struct consumer_socket
*socket
;
745 uint64_t metadata_key
;
746 bool registry_was_already_closed
;
753 pthread_mutex_lock(®istry
->lock
);
754 metadata_key
= registry
->metadata_key
;
755 registry_was_already_closed
= registry
->metadata_closed
;
756 if (metadata_key
!= 0) {
758 * Metadata closed. Even on error this means that the consumer
759 * is not responding or not found so either way a second close
760 * should NOT be emit for this registry.
762 registry
->metadata_closed
= 1;
764 pthread_mutex_unlock(®istry
->lock
);
766 if (metadata_key
== 0 || registry_was_already_closed
) {
771 /* Get consumer socket to use to push the metadata.*/
772 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
779 ret
= consumer_close_metadata(socket
, metadata_key
);
790 * We need to execute ht_destroy outside of RCU read-side critical
791 * section and outside of call_rcu thread, so we postpone its execution
792 * using ht_cleanup_push. It is simpler than to change the semantic of
793 * the many callers of delete_ust_app_session().
796 void delete_ust_app_session_rcu(struct rcu_head
*head
)
798 struct ust_app_session
*ua_sess
=
799 caa_container_of(head
, struct ust_app_session
, rcu_head
);
801 ht_cleanup_push(ua_sess
->channels
);
806 * Delete ust app session safely. RCU read lock must be held before calling
809 * The session list lock must be held by the caller.
812 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
816 struct lttng_ht_iter iter
;
817 struct ust_app_channel
*ua_chan
;
818 struct ust_registry_session
*registry
;
822 pthread_mutex_lock(&ua_sess
->lock
);
824 assert(!ua_sess
->deleted
);
825 ua_sess
->deleted
= true;
827 registry
= get_session_registry(ua_sess
);
828 /* Registry can be null on error path during initialization. */
830 /* Push metadata for application before freeing the application. */
831 (void) push_metadata(registry
, ua_sess
->consumer
);
834 * Don't ask to close metadata for global per UID buffers. Close
835 * metadata only on destroy trace session in this case. Also, the
836 * previous push metadata could have flag the metadata registry to
837 * close so don't send a close command if closed.
839 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
840 /* And ask to close it for this session registry. */
841 (void) close_metadata(registry
, ua_sess
->consumer
);
845 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
847 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
849 delete_ust_app_channel(sock
, ua_chan
, app
);
852 /* In case of per PID, the registry is kept in the session. */
853 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
854 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
857 * Registry can be null on error path during
860 buffer_reg_pid_remove(reg_pid
);
861 buffer_reg_pid_destroy(reg_pid
);
865 if (ua_sess
->handle
!= -1) {
866 pthread_mutex_lock(&app
->sock_lock
);
867 ret
= ustctl_release_handle(sock
, ua_sess
->handle
);
868 pthread_mutex_unlock(&app
->sock_lock
);
869 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
870 ERR("UST app sock %d release session handle failed with ret %d",
873 /* Remove session from application UST object descriptor. */
874 iter
.iter
.node
= &ua_sess
->ust_objd_node
.node
;
875 ret
= lttng_ht_del(app
->ust_sessions_objd
, &iter
);
879 pthread_mutex_unlock(&ua_sess
->lock
);
881 consumer_output_put(ua_sess
->consumer
);
883 call_rcu(&ua_sess
->rcu_head
, delete_ust_app_session_rcu
);
887 * Delete a traceable application structure from the global list. Never call
888 * this function outside of a call_rcu call.
890 * RCU read side lock should _NOT_ be held when calling this function.
893 void delete_ust_app(struct ust_app
*app
)
896 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
899 * The session list lock must be held during this function to guarantee
900 * the existence of ua_sess.
903 /* Delete ust app sessions info */
908 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
910 /* Free every object in the session and the session. */
912 delete_ust_app_session(sock
, ua_sess
, app
);
916 ht_cleanup_push(app
->sessions
);
917 ht_cleanup_push(app
->ust_sessions_objd
);
918 ht_cleanup_push(app
->ust_objd
);
921 * Wait until we have deleted the application from the sock hash table
922 * before closing this socket, otherwise an application could re-use the
923 * socket ID and race with the teardown, using the same hash table entry.
925 * It's OK to leave the close in call_rcu. We want it to stay unique for
926 * all RCU readers that could run concurrently with unregister app,
927 * therefore we _need_ to only close that socket after a grace period. So
928 * it should stay in this RCU callback.
930 * This close() is a very important step of the synchronization model so
931 * every modification to this function must be carefully reviewed.
937 lttng_fd_put(LTTNG_FD_APPS
, 1);
939 DBG2("UST app pid %d deleted", app
->pid
);
941 session_unlock_list();
945 * URCU intermediate call to delete an UST app.
948 void delete_ust_app_rcu(struct rcu_head
*head
)
950 struct lttng_ht_node_ulong
*node
=
951 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
952 struct ust_app
*app
=
953 caa_container_of(node
, struct ust_app
, pid_n
);
955 DBG3("Call RCU deleting app PID %d", app
->pid
);
960 * Delete the session from the application ht and delete the data structure by
961 * freeing every object inside and releasing them.
963 * The session list lock must be held by the caller.
965 static void destroy_app_session(struct ust_app
*app
,
966 struct ust_app_session
*ua_sess
)
969 struct lttng_ht_iter iter
;
974 iter
.iter
.node
= &ua_sess
->node
.node
;
975 ret
= lttng_ht_del(app
->sessions
, &iter
);
977 /* Already scheduled for teardown. */
981 /* Once deleted, free the data structure. */
982 delete_ust_app_session(app
->sock
, ua_sess
, app
);
989 * Alloc new UST app session.
992 struct ust_app_session
*alloc_ust_app_session(struct ust_app
*app
)
994 struct ust_app_session
*ua_sess
;
996 /* Init most of the default value by allocating and zeroing */
997 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
998 if (ua_sess
== NULL
) {
1003 ua_sess
->handle
= -1;
1004 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
1005 ua_sess
->metadata_attr
.type
= LTTNG_UST_CHAN_METADATA
;
1006 pthread_mutex_init(&ua_sess
->lock
, NULL
);
1015 * Alloc new UST app channel.
1018 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
1019 struct ust_app_session
*ua_sess
,
1020 struct lttng_ust_channel_attr
*attr
)
1022 struct ust_app_channel
*ua_chan
;
1024 /* Init most of the default value by allocating and zeroing */
1025 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
1026 if (ua_chan
== NULL
) {
1031 /* Setup channel name */
1032 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
1033 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1035 ua_chan
->enabled
= 1;
1036 ua_chan
->handle
= -1;
1037 ua_chan
->session
= ua_sess
;
1038 ua_chan
->key
= get_next_channel_key();
1039 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1040 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
1041 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
1043 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
1044 CDS_INIT_LIST_HEAD(&ua_chan
->ctx_list
);
1046 /* Copy attributes */
1048 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
1049 ua_chan
->attr
.subbuf_size
= attr
->subbuf_size
;
1050 ua_chan
->attr
.num_subbuf
= attr
->num_subbuf
;
1051 ua_chan
->attr
.overwrite
= attr
->overwrite
;
1052 ua_chan
->attr
.switch_timer_interval
= attr
->switch_timer_interval
;
1053 ua_chan
->attr
.read_timer_interval
= attr
->read_timer_interval
;
1054 ua_chan
->attr
.output
= attr
->output
;
1055 ua_chan
->attr
.blocking_timeout
= attr
->u
.s
.blocking_timeout
;
1057 /* By default, the channel is a per cpu channel. */
1058 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1060 DBG3("UST app channel %s allocated", ua_chan
->name
);
1069 * Allocate and initialize a UST app stream.
1071 * Return newly allocated stream pointer or NULL on error.
1073 struct ust_app_stream
*ust_app_alloc_stream(void)
1075 struct ust_app_stream
*stream
= NULL
;
1077 stream
= zmalloc(sizeof(*stream
));
1078 if (stream
== NULL
) {
1079 PERROR("zmalloc ust app stream");
1083 /* Zero could be a valid value for a handle so flag it to -1. */
1084 stream
->handle
= -1;
1091 * Alloc new UST app event.
1094 struct ust_app_event
*alloc_ust_app_event(char *name
,
1095 struct lttng_ust_event
*attr
)
1097 struct ust_app_event
*ua_event
;
1099 /* Init most of the default value by allocating and zeroing */
1100 ua_event
= zmalloc(sizeof(struct ust_app_event
));
1101 if (ua_event
== NULL
) {
1106 ua_event
->enabled
= 1;
1107 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
1108 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1109 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
1111 /* Copy attributes */
1113 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
1116 DBG3("UST app event %s allocated", ua_event
->name
);
1125 * Alloc new UST app context.
1128 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context_attr
*uctx
)
1130 struct ust_app_ctx
*ua_ctx
;
1132 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
1133 if (ua_ctx
== NULL
) {
1137 CDS_INIT_LIST_HEAD(&ua_ctx
->list
);
1140 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
1141 if (uctx
->ctx
== LTTNG_UST_CONTEXT_APP_CONTEXT
) {
1142 char *provider_name
= NULL
, *ctx_name
= NULL
;
1144 provider_name
= strdup(uctx
->u
.app_ctx
.provider_name
);
1145 ctx_name
= strdup(uctx
->u
.app_ctx
.ctx_name
);
1146 if (!provider_name
|| !ctx_name
) {
1147 free(provider_name
);
1152 ua_ctx
->ctx
.u
.app_ctx
.provider_name
= provider_name
;
1153 ua_ctx
->ctx
.u
.app_ctx
.ctx_name
= ctx_name
;
1157 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
1165 * Allocate a filter and copy the given original filter.
1167 * Return allocated filter or NULL on error.
1169 static struct lttng_filter_bytecode
*copy_filter_bytecode(
1170 struct lttng_filter_bytecode
*orig_f
)
1172 struct lttng_filter_bytecode
*filter
= NULL
;
1174 /* Copy filter bytecode */
1175 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1177 PERROR("zmalloc alloc filter bytecode");
1181 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1188 * Create a liblttng-ust filter bytecode from given bytecode.
1190 * Return allocated filter or NULL on error.
1192 static struct lttng_ust_filter_bytecode
*create_ust_bytecode_from_bytecode(
1193 struct lttng_filter_bytecode
*orig_f
)
1195 struct lttng_ust_filter_bytecode
*filter
= NULL
;
1197 /* Copy filter bytecode */
1198 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
1200 PERROR("zmalloc alloc ust filter bytecode");
1204 assert(sizeof(struct lttng_filter_bytecode
) ==
1205 sizeof(struct lttng_ust_filter_bytecode
));
1206 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
1212 * Find an ust_app using the sock and return it. RCU read side lock must be
1213 * held before calling this helper function.
1215 struct ust_app
*ust_app_find_by_sock(int sock
)
1217 struct lttng_ht_node_ulong
*node
;
1218 struct lttng_ht_iter iter
;
1220 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1221 node
= lttng_ht_iter_get_node_ulong(&iter
);
1223 DBG2("UST app find by sock %d not found", sock
);
1227 return caa_container_of(node
, struct ust_app
, sock_n
);
1234 * Find an ust_app using the notify sock and return it. RCU read side lock must
1235 * be held before calling this helper function.
1237 static struct ust_app
*find_app_by_notify_sock(int sock
)
1239 struct lttng_ht_node_ulong
*node
;
1240 struct lttng_ht_iter iter
;
1242 lttng_ht_lookup(ust_app_ht_by_notify_sock
, (void *)((unsigned long) sock
),
1244 node
= lttng_ht_iter_get_node_ulong(&iter
);
1246 DBG2("UST app find by notify sock %d not found", sock
);
1250 return caa_container_of(node
, struct ust_app
, notify_sock_n
);
1257 * Lookup for an ust app event based on event name, filter bytecode and the
1260 * Return an ust_app_event object or NULL on error.
1262 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
1263 char *name
, struct lttng_filter_bytecode
*filter
,
1265 const struct lttng_event_exclusion
*exclusion
)
1267 struct lttng_ht_iter iter
;
1268 struct lttng_ht_node_str
*node
;
1269 struct ust_app_event
*event
= NULL
;
1270 struct ust_app_ht_key key
;
1275 /* Setup key for event lookup. */
1277 key
.filter
= filter
;
1278 key
.loglevel_type
= loglevel_value
;
1279 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1280 key
.exclusion
= exclusion
;
1282 /* Lookup using the event name as hash and a custom match fct. */
1283 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
1284 ht_match_ust_app_event
, &key
, &iter
.iter
);
1285 node
= lttng_ht_iter_get_node_str(&iter
);
1290 event
= caa_container_of(node
, struct ust_app_event
, node
);
1297 * Create the channel context on the tracer.
1299 * Called with UST app session lock held.
1302 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
1303 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
1307 health_code_update();
1309 pthread_mutex_lock(&app
->sock_lock
);
1310 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
1311 ua_chan
->obj
, &ua_ctx
->obj
);
1312 pthread_mutex_unlock(&app
->sock_lock
);
1314 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1315 ERR("UST app create channel context failed for app (pid: %d) "
1316 "with ret %d", app
->pid
, ret
);
1319 * This is normal behavior, an application can die during the
1320 * creation process. Don't report an error so the execution can
1321 * continue normally.
1324 DBG3("UST app disable event failed. Application is dead.");
1329 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
1331 DBG2("UST app context handle %d created successfully for channel %s",
1332 ua_ctx
->handle
, ua_chan
->name
);
1335 health_code_update();
1340 * Set the filter on the tracer.
1343 int set_ust_event_filter(struct ust_app_event
*ua_event
,
1344 struct ust_app
*app
)
1347 struct lttng_ust_filter_bytecode
*ust_bytecode
= NULL
;
1349 health_code_update();
1351 if (!ua_event
->filter
) {
1356 ust_bytecode
= create_ust_bytecode_from_bytecode(ua_event
->filter
);
1357 if (!ust_bytecode
) {
1358 ret
= -LTTNG_ERR_NOMEM
;
1361 pthread_mutex_lock(&app
->sock_lock
);
1362 ret
= ustctl_set_filter(app
->sock
, ust_bytecode
,
1364 pthread_mutex_unlock(&app
->sock_lock
);
1366 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1367 ERR("UST app event %s filter failed for app (pid: %d) "
1368 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1371 * This is normal behavior, an application can die during the
1372 * creation process. Don't report an error so the execution can
1373 * continue normally.
1376 DBG3("UST app filter event failed. Application is dead.");
1381 DBG2("UST filter set successfully for event %s", ua_event
->name
);
1384 health_code_update();
1390 struct lttng_ust_event_exclusion
*create_ust_exclusion_from_exclusion(
1391 struct lttng_event_exclusion
*exclusion
)
1393 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1394 size_t exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1395 LTTNG_UST_SYM_NAME_LEN
* exclusion
->count
;
1397 ust_exclusion
= zmalloc(exclusion_alloc_size
);
1398 if (!ust_exclusion
) {
1403 assert(sizeof(struct lttng_event_exclusion
) ==
1404 sizeof(struct lttng_ust_event_exclusion
));
1405 memcpy(ust_exclusion
, exclusion
, exclusion_alloc_size
);
1407 return ust_exclusion
;
1411 * Set event exclusions on the tracer.
1414 int set_ust_event_exclusion(struct ust_app_event
*ua_event
,
1415 struct ust_app
*app
)
1418 struct lttng_ust_event_exclusion
*ust_exclusion
= NULL
;
1420 health_code_update();
1422 if (!ua_event
->exclusion
|| !ua_event
->exclusion
->count
) {
1427 ust_exclusion
= create_ust_exclusion_from_exclusion(
1428 ua_event
->exclusion
);
1429 if (!ust_exclusion
) {
1430 ret
= -LTTNG_ERR_NOMEM
;
1433 pthread_mutex_lock(&app
->sock_lock
);
1434 ret
= ustctl_set_exclusion(app
->sock
, ust_exclusion
, ua_event
->obj
);
1435 pthread_mutex_unlock(&app
->sock_lock
);
1437 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1438 ERR("UST app event %s exclusions failed for app (pid: %d) "
1439 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1442 * This is normal behavior, an application can die during the
1443 * creation process. Don't report an error so the execution can
1444 * continue normally.
1447 DBG3("UST app event exclusion failed. Application is dead.");
1452 DBG2("UST exclusion set successfully for event %s", ua_event
->name
);
1455 health_code_update();
1456 free(ust_exclusion
);
1461 * Disable the specified event on to UST tracer for the UST session.
1463 static int disable_ust_event(struct ust_app
*app
,
1464 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1468 health_code_update();
1470 pthread_mutex_lock(&app
->sock_lock
);
1471 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
1472 pthread_mutex_unlock(&app
->sock_lock
);
1474 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1475 ERR("UST app event %s disable failed for app (pid: %d) "
1476 "and session handle %d with ret %d",
1477 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1480 * This is normal behavior, an application can die during the
1481 * creation process. Don't report an error so the execution can
1482 * continue normally.
1485 DBG3("UST app disable event failed. Application is dead.");
1490 DBG2("UST app event %s disabled successfully for app (pid: %d)",
1491 ua_event
->attr
.name
, app
->pid
);
1494 health_code_update();
1499 * Disable the specified channel on to UST tracer for the UST session.
1501 static int disable_ust_channel(struct ust_app
*app
,
1502 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1506 health_code_update();
1508 pthread_mutex_lock(&app
->sock_lock
);
1509 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
1510 pthread_mutex_unlock(&app
->sock_lock
);
1512 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1513 ERR("UST app channel %s disable failed for app (pid: %d) "
1514 "and session handle %d with ret %d",
1515 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1518 * This is normal behavior, an application can die during the
1519 * creation process. Don't report an error so the execution can
1520 * continue normally.
1523 DBG3("UST app disable channel failed. Application is dead.");
1528 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
1529 ua_chan
->name
, app
->pid
);
1532 health_code_update();
1537 * Enable the specified channel on to UST tracer for the UST session.
1539 static int enable_ust_channel(struct ust_app
*app
,
1540 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1544 health_code_update();
1546 pthread_mutex_lock(&app
->sock_lock
);
1547 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
1548 pthread_mutex_unlock(&app
->sock_lock
);
1550 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1551 ERR("UST app channel %s enable failed for app (pid: %d) "
1552 "and session handle %d with ret %d",
1553 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1556 * This is normal behavior, an application can die during the
1557 * creation process. Don't report an error so the execution can
1558 * continue normally.
1561 DBG3("UST app enable channel failed. Application is dead.");
1566 ua_chan
->enabled
= 1;
1568 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
1569 ua_chan
->name
, app
->pid
);
1572 health_code_update();
1577 * Enable the specified event on to UST tracer for the UST session.
1579 static int enable_ust_event(struct ust_app
*app
,
1580 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1584 health_code_update();
1586 pthread_mutex_lock(&app
->sock_lock
);
1587 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
1588 pthread_mutex_unlock(&app
->sock_lock
);
1590 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1591 ERR("UST app event %s enable failed for app (pid: %d) "
1592 "and session handle %d with ret %d",
1593 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1596 * This is normal behavior, an application can die during the
1597 * creation process. Don't report an error so the execution can
1598 * continue normally.
1601 DBG3("UST app enable event failed. Application is dead.");
1606 DBG2("UST app event %s enabled successfully for app (pid: %d)",
1607 ua_event
->attr
.name
, app
->pid
);
1610 health_code_update();
1615 * Send channel and stream buffer to application.
1617 * Return 0 on success. On error, a negative value is returned.
1619 static int send_channel_pid_to_ust(struct ust_app
*app
,
1620 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1623 struct ust_app_stream
*stream
, *stmp
;
1629 health_code_update();
1631 DBG("UST app sending channel %s to UST app sock %d", ua_chan
->name
,
1634 /* Send channel to the application. */
1635 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
1636 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1637 ret
= -ENOTCONN
; /* Caused by app exiting. */
1639 } else if (ret
< 0) {
1643 health_code_update();
1645 /* Send all streams to application. */
1646 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
1647 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, stream
);
1648 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
1649 ret
= -ENOTCONN
; /* Caused by app exiting. */
1651 } else if (ret
< 0) {
1654 /* We don't need the stream anymore once sent to the tracer. */
1655 cds_list_del(&stream
->list
);
1656 delete_ust_app_stream(-1, stream
, app
);
1658 /* Flag the channel that it is sent to the application. */
1659 ua_chan
->is_sent
= 1;
1662 health_code_update();
1667 * Create the specified event onto the UST tracer for a UST session.
1669 * Should be called with session mutex held.
1672 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
1673 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
1677 health_code_update();
1679 /* Create UST event on tracer */
1680 pthread_mutex_lock(&app
->sock_lock
);
1681 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
1683 pthread_mutex_unlock(&app
->sock_lock
);
1685 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1686 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1687 ua_event
->attr
.name
, app
->pid
, ret
);
1690 * This is normal behavior, an application can die during the
1691 * creation process. Don't report an error so the execution can
1692 * continue normally.
1695 DBG3("UST app create event failed. Application is dead.");
1700 ua_event
->handle
= ua_event
->obj
->handle
;
1702 DBG2("UST app event %s created successfully for pid:%d",
1703 ua_event
->attr
.name
, app
->pid
);
1705 health_code_update();
1707 /* Set filter if one is present. */
1708 if (ua_event
->filter
) {
1709 ret
= set_ust_event_filter(ua_event
, app
);
1715 /* Set exclusions for the event */
1716 if (ua_event
->exclusion
) {
1717 ret
= set_ust_event_exclusion(ua_event
, app
);
1723 /* If event not enabled, disable it on the tracer */
1724 if (ua_event
->enabled
) {
1726 * We now need to explicitly enable the event, since it
1727 * is now disabled at creation.
1729 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1732 * If we hit an EPERM, something is wrong with our enable call. If
1733 * we get an EEXIST, there is a problem on the tracer side since we
1737 case -LTTNG_UST_ERR_PERM
:
1738 /* Code flow problem */
1740 case -LTTNG_UST_ERR_EXIST
:
1741 /* It's OK for our use case. */
1752 health_code_update();
1757 * Copy data between an UST app event and a LTT event.
1759 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1760 struct ltt_ust_event
*uevent
)
1762 size_t exclusion_alloc_size
;
1764 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1765 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1767 ua_event
->enabled
= uevent
->enabled
;
1769 /* Copy event attributes */
1770 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1772 /* Copy filter bytecode */
1773 if (uevent
->filter
) {
1774 ua_event
->filter
= copy_filter_bytecode(uevent
->filter
);
1775 /* Filter might be NULL here in case of ENONEM. */
1778 /* Copy exclusion data */
1779 if (uevent
->exclusion
) {
1780 exclusion_alloc_size
= sizeof(struct lttng_event_exclusion
) +
1781 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1782 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1783 if (ua_event
->exclusion
== NULL
) {
1786 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1787 exclusion_alloc_size
);
1793 * Copy data between an UST app channel and a LTT channel.
1795 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1796 struct ltt_ust_channel
*uchan
)
1798 struct lttng_ht_iter iter
;
1799 struct ltt_ust_event
*uevent
;
1800 struct ltt_ust_context
*uctx
;
1801 struct ust_app_event
*ua_event
;
1803 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1805 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1806 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1808 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1809 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1811 /* Copy event attributes since the layout is different. */
1812 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1813 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1814 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1815 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1816 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1817 ua_chan
->monitor_timer_interval
= uchan
->monitor_timer_interval
;
1818 ua_chan
->attr
.output
= uchan
->attr
.output
;
1819 ua_chan
->attr
.blocking_timeout
= uchan
->attr
.u
.s
.blocking_timeout
;
1822 * Note that the attribute channel type is not set since the channel on the
1823 * tracing registry side does not have this information.
1826 ua_chan
->enabled
= uchan
->enabled
;
1827 ua_chan
->tracing_channel_id
= uchan
->id
;
1829 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
1830 struct ust_app_ctx
*ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
1832 if (ua_ctx
== NULL
) {
1835 lttng_ht_node_init_ulong(&ua_ctx
->node
,
1836 (unsigned long) ua_ctx
->ctx
.ctx
);
1837 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1838 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
1841 /* Copy all events from ltt ust channel to ust app channel */
1842 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
1843 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1844 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
1845 if (ua_event
== NULL
) {
1846 DBG2("UST event %s not found on shadow copy channel",
1848 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1849 if (ua_event
== NULL
) {
1852 shadow_copy_event(ua_event
, uevent
);
1853 add_unique_ust_app_event(ua_chan
, ua_event
);
1857 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1861 * Copy data between a UST app session and a regular LTT session.
1863 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1864 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1866 struct lttng_ht_node_str
*ua_chan_node
;
1867 struct lttng_ht_iter iter
;
1868 struct ltt_ust_channel
*uchan
;
1869 struct ust_app_channel
*ua_chan
;
1871 struct tm
*timeinfo
;
1874 char tmp_shm_path
[PATH_MAX
];
1876 /* Get date and time for unique app path */
1878 timeinfo
= localtime(&rawtime
);
1879 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1881 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1883 ua_sess
->tracing_id
= usess
->id
;
1884 ua_sess
->id
= get_next_session_id();
1885 ua_sess
->uid
= app
->uid
;
1886 ua_sess
->gid
= app
->gid
;
1887 ua_sess
->euid
= usess
->uid
;
1888 ua_sess
->egid
= usess
->gid
;
1889 ua_sess
->buffer_type
= usess
->buffer_type
;
1890 ua_sess
->bits_per_long
= app
->bits_per_long
;
1892 /* There is only one consumer object per session possible. */
1893 consumer_output_get(usess
->consumer
);
1894 ua_sess
->consumer
= usess
->consumer
;
1896 ua_sess
->output_traces
= usess
->output_traces
;
1897 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1898 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1899 &usess
->metadata_attr
);
1901 switch (ua_sess
->buffer_type
) {
1902 case LTTNG_BUFFER_PER_PID
:
1903 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1904 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1907 case LTTNG_BUFFER_PER_UID
:
1908 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1909 DEFAULT_UST_TRACE_UID_PATH
, ua_sess
->uid
, app
->bits_per_long
);
1916 PERROR("asprintf UST shadow copy session");
1921 strncpy(ua_sess
->root_shm_path
, usess
->root_shm_path
,
1922 sizeof(ua_sess
->root_shm_path
));
1923 ua_sess
->root_shm_path
[sizeof(ua_sess
->root_shm_path
) - 1] = '\0';
1924 strncpy(ua_sess
->shm_path
, usess
->shm_path
,
1925 sizeof(ua_sess
->shm_path
));
1926 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1927 if (ua_sess
->shm_path
[0]) {
1928 switch (ua_sess
->buffer_type
) {
1929 case LTTNG_BUFFER_PER_PID
:
1930 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1931 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s",
1932 app
->name
, app
->pid
, datetime
);
1934 case LTTNG_BUFFER_PER_UID
:
1935 ret
= snprintf(tmp_shm_path
, sizeof(tmp_shm_path
),
1936 DEFAULT_UST_TRACE_UID_PATH
,
1937 app
->uid
, app
->bits_per_long
);
1944 PERROR("sprintf UST shadow copy session");
1948 strncat(ua_sess
->shm_path
, tmp_shm_path
,
1949 sizeof(ua_sess
->shm_path
) - strlen(ua_sess
->shm_path
) - 1);
1950 ua_sess
->shm_path
[sizeof(ua_sess
->shm_path
) - 1] = '\0';
1953 /* Iterate over all channels in global domain. */
1954 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1956 struct lttng_ht_iter uiter
;
1958 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1959 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1960 if (ua_chan_node
!= NULL
) {
1961 /* Session exist. Contiuing. */
1965 DBG2("Channel %s not found on shadow session copy, creating it",
1967 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
,
1969 if (ua_chan
== NULL
) {
1970 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1973 shadow_copy_channel(ua_chan
, uchan
);
1975 * The concept of metadata channel does not exist on the tracing
1976 * registry side of the session daemon so this can only be a per CPU
1977 * channel and not metadata.
1979 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1981 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1986 consumer_output_put(ua_sess
->consumer
);
1990 * Lookup sesison wrapper.
1993 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1994 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1996 /* Get right UST app session from app */
1997 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
2001 * Return ust app session from the app session hashtable using the UST session
2004 static struct ust_app_session
*lookup_session_by_app(
2005 struct ltt_ust_session
*usess
, struct ust_app
*app
)
2007 struct lttng_ht_iter iter
;
2008 struct lttng_ht_node_u64
*node
;
2010 __lookup_session_by_app(usess
, app
, &iter
);
2011 node
= lttng_ht_iter_get_node_u64(&iter
);
2016 return caa_container_of(node
, struct ust_app_session
, node
);
2023 * Setup buffer registry per PID for the given session and application. If none
2024 * is found, a new one is created, added to the global registry and
2025 * initialized. If regp is valid, it's set with the newly created object.
2027 * Return 0 on success or else a negative value.
2029 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
2030 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
2033 struct buffer_reg_pid
*reg_pid
;
2040 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
2043 * This is the create channel path meaning that if there is NO
2044 * registry available, we have to create one for this session.
2046 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
,
2047 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
2055 /* Initialize registry. */
2056 ret
= ust_registry_session_init(®_pid
->registry
->reg
.ust
, app
,
2057 app
->bits_per_long
, app
->uint8_t_alignment
,
2058 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
2059 app
->uint64_t_alignment
, app
->long_alignment
,
2060 app
->byte_order
, app
->version
.major
,
2061 app
->version
.minor
, reg_pid
->root_shm_path
,
2063 ua_sess
->euid
, ua_sess
->egid
);
2066 * reg_pid->registry->reg.ust is NULL upon error, so we need to
2067 * destroy the buffer registry, because it is always expected
2068 * that if the buffer registry can be found, its ust registry is
2071 buffer_reg_pid_destroy(reg_pid
);
2075 buffer_reg_pid_add(reg_pid
);
2077 DBG3("UST app buffer registry per PID created successfully");
2089 * Setup buffer registry per UID for the given session and application. If none
2090 * is found, a new one is created, added to the global registry and
2091 * initialized. If regp is valid, it's set with the newly created object.
2093 * Return 0 on success or else a negative value.
2095 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
2096 struct ust_app_session
*ua_sess
,
2097 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
2100 struct buffer_reg_uid
*reg_uid
;
2107 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2110 * This is the create channel path meaning that if there is NO
2111 * registry available, we have to create one for this session.
2113 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
2114 LTTNG_DOMAIN_UST
, ®_uid
,
2115 ua_sess
->root_shm_path
, ua_sess
->shm_path
);
2123 /* Initialize registry. */
2124 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
2125 app
->bits_per_long
, app
->uint8_t_alignment
,
2126 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
2127 app
->uint64_t_alignment
, app
->long_alignment
,
2128 app
->byte_order
, app
->version
.major
,
2129 app
->version
.minor
, reg_uid
->root_shm_path
,
2130 reg_uid
->shm_path
, usess
->uid
, usess
->gid
);
2133 * reg_uid->registry->reg.ust is NULL upon error, so we need to
2134 * destroy the buffer registry, because it is always expected
2135 * that if the buffer registry can be found, its ust registry is
2138 buffer_reg_uid_destroy(reg_uid
, NULL
);
2141 /* Add node to teardown list of the session. */
2142 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
2144 buffer_reg_uid_add(reg_uid
);
2146 DBG3("UST app buffer registry per UID created successfully");
2157 * Create a session on the tracer side for the given app.
2159 * On success, ua_sess_ptr is populated with the session pointer or else left
2160 * untouched. If the session was created, is_created is set to 1. On error,
2161 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
2164 * Returns 0 on success or else a negative code which is either -ENOMEM or
2165 * -ENOTCONN which is the default code if the ustctl_create_session fails.
2167 static int create_ust_app_session(struct ltt_ust_session
*usess
,
2168 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
2171 int ret
, created
= 0;
2172 struct ust_app_session
*ua_sess
;
2176 assert(ua_sess_ptr
);
2178 health_code_update();
2180 ua_sess
= lookup_session_by_app(usess
, app
);
2181 if (ua_sess
== NULL
) {
2182 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
2183 app
->pid
, usess
->id
);
2184 ua_sess
= alloc_ust_app_session(app
);
2185 if (ua_sess
== NULL
) {
2186 /* Only malloc can failed so something is really wrong */
2190 shadow_copy_session(ua_sess
, usess
, app
);
2194 switch (usess
->buffer_type
) {
2195 case LTTNG_BUFFER_PER_PID
:
2196 /* Init local registry. */
2197 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
2199 delete_ust_app_session(-1, ua_sess
, app
);
2203 case LTTNG_BUFFER_PER_UID
:
2204 /* Look for a global registry. If none exists, create one. */
2205 ret
= setup_buffer_reg_uid(usess
, ua_sess
, app
, NULL
);
2207 delete_ust_app_session(-1, ua_sess
, app
);
2217 health_code_update();
2219 if (ua_sess
->handle
== -1) {
2220 pthread_mutex_lock(&app
->sock_lock
);
2221 ret
= ustctl_create_session(app
->sock
);
2222 pthread_mutex_unlock(&app
->sock_lock
);
2224 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
2225 ERR("Creating session for app pid %d with ret %d",
2228 DBG("UST app creating session failed. Application is dead");
2230 * This is normal behavior, an application can die during the
2231 * creation process. Don't report an error so the execution can
2232 * continue normally. This will get flagged ENOTCONN and the
2233 * caller will handle it.
2237 delete_ust_app_session(-1, ua_sess
, app
);
2238 if (ret
!= -ENOMEM
) {
2240 * Tracer is probably gone or got an internal error so let's
2241 * behave like it will soon unregister or not usable.
2248 ua_sess
->handle
= ret
;
2250 /* Add ust app session to app's HT */
2251 lttng_ht_node_init_u64(&ua_sess
->node
,
2252 ua_sess
->tracing_id
);
2253 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
2254 lttng_ht_node_init_ulong(&ua_sess
->ust_objd_node
, ua_sess
->handle
);
2255 lttng_ht_add_unique_ulong(app
->ust_sessions_objd
,
2256 &ua_sess
->ust_objd_node
);
2258 DBG2("UST app session created successfully with handle %d", ret
);
2261 *ua_sess_ptr
= ua_sess
;
2263 *is_created
= created
;
2266 /* Everything went well. */
2270 health_code_update();
2275 * Match function for a hash table lookup of ust_app_ctx.
2277 * It matches an ust app context based on the context type and, in the case
2278 * of perf counters, their name.
2280 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
2282 struct ust_app_ctx
*ctx
;
2283 const struct lttng_ust_context_attr
*key
;
2288 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
2292 if (ctx
->ctx
.ctx
!= key
->ctx
) {
2297 case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
:
2298 if (strncmp(key
->u
.perf_counter
.name
,
2299 ctx
->ctx
.u
.perf_counter
.name
,
2300 sizeof(key
->u
.perf_counter
.name
))) {
2304 case LTTNG_UST_CONTEXT_APP_CONTEXT
:
2305 if (strcmp(key
->u
.app_ctx
.provider_name
,
2306 ctx
->ctx
.u
.app_ctx
.provider_name
) ||
2307 strcmp(key
->u
.app_ctx
.ctx_name
,
2308 ctx
->ctx
.u
.app_ctx
.ctx_name
)) {
2324 * Lookup for an ust app context from an lttng_ust_context.
2326 * Must be called while holding RCU read side lock.
2327 * Return an ust_app_ctx object or NULL on error.
2330 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
2331 struct lttng_ust_context_attr
*uctx
)
2333 struct lttng_ht_iter iter
;
2334 struct lttng_ht_node_ulong
*node
;
2335 struct ust_app_ctx
*app_ctx
= NULL
;
2340 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2341 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
2342 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
2343 node
= lttng_ht_iter_get_node_ulong(&iter
);
2348 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
2355 * Create a context for the channel on the tracer.
2357 * Called with UST app session lock held and a RCU read side lock.
2360 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
2361 struct ust_app_channel
*ua_chan
,
2362 struct lttng_ust_context_attr
*uctx
,
2363 struct ust_app
*app
)
2366 struct ust_app_ctx
*ua_ctx
;
2368 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2370 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2376 ua_ctx
= alloc_ust_app_ctx(uctx
);
2377 if (ua_ctx
== NULL
) {
2383 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2384 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2385 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2387 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2397 * Enable on the tracer side a ust app event for the session and channel.
2399 * Called with UST app session lock held.
2402 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2403 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2407 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2412 ua_event
->enabled
= 1;
2419 * Disable on the tracer side a ust app event for the session and channel.
2421 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2422 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2426 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2431 ua_event
->enabled
= 0;
2438 * Lookup ust app channel for session and disable it on the tracer side.
2441 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2442 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2446 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2451 ua_chan
->enabled
= 0;
2458 * Lookup ust app channel for session and enable it on the tracer side. This
2459 * MUST be called with a RCU read side lock acquired.
2461 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2462 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2465 struct lttng_ht_iter iter
;
2466 struct lttng_ht_node_str
*ua_chan_node
;
2467 struct ust_app_channel
*ua_chan
;
2469 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2470 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2471 if (ua_chan_node
== NULL
) {
2472 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2473 uchan
->name
, ua_sess
->tracing_id
);
2477 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2479 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2489 * Ask the consumer to create a channel and get it if successful.
2491 * Called with UST app session lock held.
2493 * Return 0 on success or else a negative value.
2495 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2496 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2497 int bitness
, struct ust_registry_session
*registry
)
2500 unsigned int nb_fd
= 0;
2501 struct consumer_socket
*socket
;
2509 health_code_update();
2511 /* Get the right consumer socket for the application. */
2512 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2518 health_code_update();
2520 /* Need one fd for the channel. */
2521 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2523 ERR("Exhausted number of available FD upon create channel");
2528 * Ask consumer to create channel. The consumer will return the number of
2529 * stream we have to expect.
2531 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2538 * Compute the number of fd needed before receiving them. It must be 2 per
2539 * stream (2 being the default value here).
2541 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2543 /* Reserve the amount of file descriptor we need. */
2544 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2546 ERR("Exhausted number of available FD upon create channel");
2547 goto error_fd_get_stream
;
2550 health_code_update();
2553 * Now get the channel from the consumer. This call wil populate the stream
2554 * list of that channel and set the ust objects.
2556 if (usess
->consumer
->enabled
) {
2557 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2567 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2568 error_fd_get_stream
:
2570 * Initiate a destroy channel on the consumer since we had an error
2571 * handling it on our side. The return value is of no importance since we
2572 * already have a ret value set by the previous error that we need to
2575 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2577 lttng_fd_put(LTTNG_FD_APPS
, 1);
2579 health_code_update();
2585 * Duplicate the ust data object of the ust app stream and save it in the
2586 * buffer registry stream.
2588 * Return 0 on success or else a negative value.
2590 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2591 struct ust_app_stream
*stream
)
2598 /* Reserve the amount of file descriptor we need. */
2599 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2601 ERR("Exhausted number of available FD upon duplicate stream");
2605 /* Duplicate object for stream once the original is in the registry. */
2606 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2607 reg_stream
->obj
.ust
);
2609 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2610 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2611 lttng_fd_put(LTTNG_FD_APPS
, 2);
2614 stream
->handle
= stream
->obj
->handle
;
2621 * Duplicate the ust data object of the ust app. channel and save it in the
2622 * buffer registry channel.
2624 * Return 0 on success or else a negative value.
2626 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2627 struct ust_app_channel
*ua_chan
)
2634 /* Need two fds for the channel. */
2635 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2637 ERR("Exhausted number of available FD upon duplicate channel");
2641 /* Duplicate object for stream once the original is in the registry. */
2642 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2644 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2645 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2648 ua_chan
->handle
= ua_chan
->obj
->handle
;
2653 lttng_fd_put(LTTNG_FD_APPS
, 1);
2659 * For a given channel buffer registry, setup all streams of the given ust
2660 * application channel.
2662 * Return 0 on success or else a negative value.
2664 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2665 struct ust_app_channel
*ua_chan
,
2666 struct ust_app
*app
)
2669 struct ust_app_stream
*stream
, *stmp
;
2674 DBG2("UST app setup buffer registry stream");
2676 /* Send all streams to application. */
2677 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2678 struct buffer_reg_stream
*reg_stream
;
2680 ret
= buffer_reg_stream_create(®_stream
);
2686 * Keep original pointer and nullify it in the stream so the delete
2687 * stream call does not release the object.
2689 reg_stream
->obj
.ust
= stream
->obj
;
2691 buffer_reg_stream_add(reg_stream
, reg_chan
);
2693 /* We don't need the streams anymore. */
2694 cds_list_del(&stream
->list
);
2695 delete_ust_app_stream(-1, stream
, app
);
2703 * Create a buffer registry channel for the given session registry and
2704 * application channel object. If regp pointer is valid, it's set with the
2705 * created object. Important, the created object is NOT added to the session
2706 * registry hash table.
2708 * Return 0 on success else a negative value.
2710 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2711 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2714 struct buffer_reg_channel
*reg_chan
= NULL
;
2719 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2721 /* Create buffer registry channel. */
2722 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2727 reg_chan
->consumer_key
= ua_chan
->key
;
2728 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2729 reg_chan
->num_subbuf
= ua_chan
->attr
.num_subbuf
;
2731 /* Create and add a channel registry to session. */
2732 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2733 ua_chan
->tracing_channel_id
);
2737 buffer_reg_channel_add(reg_sess
, reg_chan
);
2746 /* Safe because the registry channel object was not added to any HT. */
2747 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2753 * Setup buffer registry channel for the given session registry and application
2754 * channel object. If regp pointer is valid, it's set with the created object.
2756 * Return 0 on success else a negative value.
2758 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2759 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
,
2760 struct ust_app
*app
)
2767 assert(ua_chan
->obj
);
2769 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2771 /* Setup all streams for the registry. */
2772 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
, app
);
2777 reg_chan
->obj
.ust
= ua_chan
->obj
;
2778 ua_chan
->obj
= NULL
;
2783 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2784 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2789 * Send buffer registry channel to the application.
2791 * Return 0 on success else a negative value.
2793 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2794 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2795 struct ust_app_channel
*ua_chan
)
2798 struct buffer_reg_stream
*reg_stream
;
2805 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2807 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2812 /* Send channel to the application. */
2813 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2814 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2815 ret
= -ENOTCONN
; /* Caused by app exiting. */
2817 } else if (ret
< 0) {
2821 health_code_update();
2823 /* Send all streams to application. */
2824 pthread_mutex_lock(®_chan
->stream_list_lock
);
2825 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2826 struct ust_app_stream stream
;
2828 ret
= duplicate_stream_object(reg_stream
, &stream
);
2830 goto error_stream_unlock
;
2833 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2835 (void) release_ust_app_stream(-1, &stream
, app
);
2836 if (ret
== -EPIPE
|| ret
== -LTTNG_UST_ERR_EXITING
) {
2837 ret
= -ENOTCONN
; /* Caused by app exiting. */
2839 goto error_stream_unlock
;
2843 * The return value is not important here. This function will output an
2846 (void) release_ust_app_stream(-1, &stream
, app
);
2848 ua_chan
->is_sent
= 1;
2850 error_stream_unlock
:
2851 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2857 * Create and send to the application the created buffers with per UID buffers.
2859 * Return 0 on success else a negative value.
2861 static int create_channel_per_uid(struct ust_app
*app
,
2862 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2863 struct ust_app_channel
*ua_chan
)
2866 struct buffer_reg_uid
*reg_uid
;
2867 struct buffer_reg_channel
*reg_chan
;
2868 bool created
= false;
2875 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2877 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2879 * The session creation handles the creation of this global registry
2880 * object. If none can be find, there is a code flow problem or a
2885 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2888 /* Create the buffer registry channel object. */
2889 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2891 ERR("Error creating the UST channel \"%s\" registry instance",
2898 * Create the buffers on the consumer side. This call populates the
2899 * ust app channel object with all streams and data object.
2901 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2902 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
);
2904 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2908 * Let's remove the previously created buffer registry channel so
2909 * it's not visible anymore in the session registry.
2911 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2912 ua_chan
->tracing_channel_id
, false);
2913 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2914 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2919 * Setup the streams and add it to the session registry.
2921 ret
= setup_buffer_reg_channel(reg_uid
->registry
,
2922 ua_chan
, reg_chan
, app
);
2924 ERR("Error setting up UST channel \"%s\"",
2932 enum lttng_error_code cmd_ret
;
2933 struct ltt_session
*session
;
2934 uint64_t chan_reg_key
;
2935 struct ust_registry_channel
*chan_reg
;
2938 chan_reg_key
= ua_chan
->tracing_channel_id
;
2940 pthread_mutex_lock(®_uid
->registry
->reg
.ust
->lock
);
2941 chan_reg
= ust_registry_channel_find(reg_uid
->registry
->reg
.ust
,
2944 chan_reg
->consumer_key
= ua_chan
->key
;
2946 pthread_mutex_unlock(®_uid
->registry
->reg
.ust
->lock
);
2948 session
= session_find_by_id(ua_sess
->tracing_id
);
2951 cmd_ret
= notification_thread_command_add_channel(
2952 notification_thread_handle
, session
->name
,
2953 ua_sess
->euid
, ua_sess
->egid
,
2957 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
2959 if (cmd_ret
!= LTTNG_OK
) {
2960 ret
= - (int) cmd_ret
;
2961 ERR("Failed to add channel to notification thread");
2966 /* Send buffers to the application. */
2967 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2969 if (ret
!= -ENOTCONN
) {
2970 ERR("Error sending channel to application");
2980 * Create and send to the application the created buffers with per PID buffers.
2982 * Called with UST app session lock held.
2984 * Return 0 on success else a negative value.
2986 static int create_channel_per_pid(struct ust_app
*app
,
2987 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2988 struct ust_app_channel
*ua_chan
)
2991 struct ust_registry_session
*registry
;
2992 enum lttng_error_code cmd_ret
;
2993 struct ltt_session
*session
;
2994 uint64_t chan_reg_key
;
2995 struct ust_registry_channel
*chan_reg
;
3002 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
3006 registry
= get_session_registry(ua_sess
);
3007 /* The UST app session lock is held, registry shall not be null. */
3010 /* Create and add a new channel registry to session. */
3011 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
3013 ERR("Error creating the UST channel \"%s\" registry instance",
3018 /* Create and get channel on the consumer side. */
3019 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
3020 app
->bits_per_long
, registry
);
3022 ERR("Error creating UST channel \"%s\" on the consumer daemon",
3024 goto error_remove_from_registry
;
3027 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
3029 if (ret
!= -ENOTCONN
) {
3030 ERR("Error sending channel to application");
3032 goto error_remove_from_registry
;
3035 session
= session_find_by_id(ua_sess
->tracing_id
);
3038 chan_reg_key
= ua_chan
->key
;
3039 pthread_mutex_lock(®istry
->lock
);
3040 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
3042 chan_reg
->consumer_key
= ua_chan
->key
;
3043 pthread_mutex_unlock(®istry
->lock
);
3045 cmd_ret
= notification_thread_command_add_channel(
3046 notification_thread_handle
, session
->name
,
3047 ua_sess
->euid
, ua_sess
->egid
,
3051 ua_chan
->attr
.subbuf_size
* ua_chan
->attr
.num_subbuf
);
3052 if (cmd_ret
!= LTTNG_OK
) {
3053 ret
= - (int) cmd_ret
;
3054 ERR("Failed to add channel to notification thread");
3055 goto error_remove_from_registry
;
3058 error_remove_from_registry
:
3060 ust_registry_channel_del_free(registry
, ua_chan
->key
, false);
3068 * From an already allocated ust app channel, create the channel buffers if
3069 * need and send it to the application. This MUST be called with a RCU read
3070 * side lock acquired.
3072 * Called with UST app session lock held.
3074 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3075 * the application exited concurrently.
3077 static int do_create_channel(struct ust_app
*app
,
3078 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
3079 struct ust_app_channel
*ua_chan
)
3088 /* Handle buffer type before sending the channel to the application. */
3089 switch (usess
->buffer_type
) {
3090 case LTTNG_BUFFER_PER_UID
:
3092 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
3098 case LTTNG_BUFFER_PER_PID
:
3100 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
3112 /* Initialize ust objd object using the received handle and add it. */
3113 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
3114 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
3116 /* If channel is not enabled, disable it on the tracer */
3117 if (!ua_chan
->enabled
) {
3118 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
3129 * Create UST app channel and create it on the tracer. Set ua_chanp of the
3130 * newly created channel if not NULL.
3132 * Called with UST app session lock and RCU read-side lock held.
3134 * Return 0 on success or else a negative value. Returns -ENOTCONN if
3135 * the application exited concurrently.
3137 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
3138 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
3139 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
3140 struct ust_app_channel
**ua_chanp
)
3143 struct lttng_ht_iter iter
;
3144 struct lttng_ht_node_str
*ua_chan_node
;
3145 struct ust_app_channel
*ua_chan
;
3147 /* Lookup channel in the ust app session */
3148 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
3149 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
3150 if (ua_chan_node
!= NULL
) {
3151 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3155 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
3156 if (ua_chan
== NULL
) {
3157 /* Only malloc can fail here */
3161 shadow_copy_channel(ua_chan
, uchan
);
3163 /* Set channel type. */
3164 ua_chan
->attr
.type
= type
;
3166 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
3171 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
3174 /* Only add the channel if successful on the tracer side. */
3175 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
3178 *ua_chanp
= ua_chan
;
3181 /* Everything went well. */
3185 delete_ust_app_channel(ua_chan
->is_sent
? app
->sock
: -1, ua_chan
, app
);
3191 * Create UST app event and create it on the tracer side.
3193 * Called with ust app session mutex held.
3196 int create_ust_app_event(struct ust_app_session
*ua_sess
,
3197 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
3198 struct ust_app
*app
)
3201 struct ust_app_event
*ua_event
;
3203 /* Get event node */
3204 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
3205 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
3206 if (ua_event
!= NULL
) {
3211 /* Does not exist so create one */
3212 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
3213 if (ua_event
== NULL
) {
3214 /* Only malloc can failed so something is really wrong */
3218 shadow_copy_event(ua_event
, uevent
);
3220 /* Create it on the tracer side */
3221 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
3223 /* Not found previously means that it does not exist on the tracer */
3224 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
3228 add_unique_ust_app_event(ua_chan
, ua_event
);
3230 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
3237 /* Valid. Calling here is already in a read side lock */
3238 delete_ust_app_event(-1, ua_event
, app
);
3243 * Create UST metadata and open it on the tracer side.
3245 * Called with UST app session lock held and RCU read side lock.
3247 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
3248 struct ust_app
*app
, struct consumer_output
*consumer
)
3251 struct ust_app_channel
*metadata
;
3252 struct consumer_socket
*socket
;
3253 struct ust_registry_session
*registry
;
3259 registry
= get_session_registry(ua_sess
);
3260 /* The UST app session is held registry shall not be null. */
3263 pthread_mutex_lock(®istry
->lock
);
3265 /* Metadata already exists for this registry or it was closed previously */
3266 if (registry
->metadata_key
|| registry
->metadata_closed
) {
3271 /* Allocate UST metadata */
3272 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
3274 /* malloc() failed */
3279 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
3281 /* Need one fd for the channel. */
3282 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
3284 ERR("Exhausted number of available FD upon create metadata");
3288 /* Get the right consumer socket for the application. */
3289 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
3292 goto error_consumer
;
3296 * Keep metadata key so we can identify it on the consumer side. Assign it
3297 * to the registry *before* we ask the consumer so we avoid the race of the
3298 * consumer requesting the metadata and the ask_channel call on our side
3299 * did not returned yet.
3301 registry
->metadata_key
= metadata
->key
;
3304 * Ask the metadata channel creation to the consumer. The metadata object
3305 * will be created by the consumer and kept their. However, the stream is
3306 * never added or monitored until we do a first push metadata to the
3309 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
3312 /* Nullify the metadata key so we don't try to close it later on. */
3313 registry
->metadata_key
= 0;
3314 goto error_consumer
;
3318 * The setup command will make the metadata stream be sent to the relayd,
3319 * if applicable, and the thread managing the metadatas. This is important
3320 * because after this point, if an error occurs, the only way the stream
3321 * can be deleted is to be monitored in the consumer.
3323 ret
= consumer_setup_metadata(socket
, metadata
->key
);
3325 /* Nullify the metadata key so we don't try to close it later on. */
3326 registry
->metadata_key
= 0;
3327 goto error_consumer
;
3330 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
3331 metadata
->key
, app
->pid
);
3334 lttng_fd_put(LTTNG_FD_APPS
, 1);
3335 delete_ust_app_channel(-1, metadata
, app
);
3337 pthread_mutex_unlock(®istry
->lock
);
3342 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
3343 * acquired before calling this function.
3345 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
3347 struct ust_app
*app
= NULL
;
3348 struct lttng_ht_node_ulong
*node
;
3349 struct lttng_ht_iter iter
;
3351 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
3352 node
= lttng_ht_iter_get_node_ulong(&iter
);
3354 DBG2("UST app no found with pid %d", pid
);
3358 DBG2("Found UST app by pid %d", pid
);
3360 app
= caa_container_of(node
, struct ust_app
, pid_n
);
3367 * Allocate and init an UST app object using the registration information and
3368 * the command socket. This is called when the command socket connects to the
3371 * The object is returned on success or else NULL.
3373 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
3375 struct ust_app
*lta
= NULL
;
3380 DBG3("UST app creating application for socket %d", sock
);
3382 if ((msg
->bits_per_long
== 64 &&
3383 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
3384 || (msg
->bits_per_long
== 32 &&
3385 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
3386 ERR("Registration failed: application \"%s\" (pid: %d) has "
3387 "%d-bit long, but no consumerd for this size is available.\n",
3388 msg
->name
, msg
->pid
, msg
->bits_per_long
);
3392 lta
= zmalloc(sizeof(struct ust_app
));
3398 lta
->ppid
= msg
->ppid
;
3399 lta
->uid
= msg
->uid
;
3400 lta
->gid
= msg
->gid
;
3402 lta
->bits_per_long
= msg
->bits_per_long
;
3403 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
3404 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
3405 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
3406 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
3407 lta
->long_alignment
= msg
->long_alignment
;
3408 lta
->byte_order
= msg
->byte_order
;
3410 lta
->v_major
= msg
->major
;
3411 lta
->v_minor
= msg
->minor
;
3412 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3413 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3414 lta
->ust_sessions_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3415 lta
->notify_sock
= -1;
3417 /* Copy name and make sure it's NULL terminated. */
3418 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
3419 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
3422 * Before this can be called, when receiving the registration information,
3423 * the application compatibility is checked. So, at this point, the
3424 * application can work with this session daemon.
3426 lta
->compatible
= 1;
3428 lta
->pid
= msg
->pid
;
3429 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
3431 pthread_mutex_init(<a
->sock_lock
, NULL
);
3432 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
3434 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
3440 * For a given application object, add it to every hash table.
3442 void ust_app_add(struct ust_app
*app
)
3445 assert(app
->notify_sock
>= 0);
3450 * On a re-registration, we want to kick out the previous registration of
3453 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3456 * The socket _should_ be unique until _we_ call close. So, a add_unique
3457 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3458 * already in the table.
3460 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3462 /* Add application to the notify socket hash table. */
3463 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3464 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3466 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3467 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3468 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3475 * Set the application version into the object.
3477 * Return 0 on success else a negative value either an errno code or a
3478 * LTTng-UST error code.
3480 int ust_app_version(struct ust_app
*app
)
3486 pthread_mutex_lock(&app
->sock_lock
);
3487 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3488 pthread_mutex_unlock(&app
->sock_lock
);
3490 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3491 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3493 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3501 * Unregister app by removing it from the global traceable app list and freeing
3504 * The socket is already closed at this point so no close to sock.
3506 void ust_app_unregister(int sock
)
3508 struct ust_app
*lta
;
3509 struct lttng_ht_node_ulong
*node
;
3510 struct lttng_ht_iter ust_app_sock_iter
;
3511 struct lttng_ht_iter iter
;
3512 struct ust_app_session
*ua_sess
;
3517 /* Get the node reference for a call_rcu */
3518 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &ust_app_sock_iter
);
3519 node
= lttng_ht_iter_get_node_ulong(&ust_app_sock_iter
);
3522 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3523 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3526 * For per-PID buffers, perform "push metadata" and flush all
3527 * application streams before removing app from hash tables,
3528 * ensuring proper behavior of data_pending check.
3529 * Remove sessions so they are not visible during deletion.
3531 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3533 struct ust_registry_session
*registry
;
3535 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3537 /* The session was already removed so scheduled for teardown. */
3541 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
3542 (void) ust_app_flush_app_session(lta
, ua_sess
);
3546 * Add session to list for teardown. This is safe since at this point we
3547 * are the only one using this list.
3549 pthread_mutex_lock(&ua_sess
->lock
);
3551 if (ua_sess
->deleted
) {
3552 pthread_mutex_unlock(&ua_sess
->lock
);
3557 * Normally, this is done in the delete session process which is
3558 * executed in the call rcu below. However, upon registration we can't
3559 * afford to wait for the grace period before pushing data or else the
3560 * data pending feature can race between the unregistration and stop
3561 * command where the data pending command is sent *before* the grace
3564 * The close metadata below nullifies the metadata pointer in the
3565 * session so the delete session will NOT push/close a second time.
3567 registry
= get_session_registry(ua_sess
);
3569 /* Push metadata for application before freeing the application. */
3570 (void) push_metadata(registry
, ua_sess
->consumer
);
3573 * Don't ask to close metadata for global per UID buffers. Close
3574 * metadata only on destroy trace session in this case. Also, the
3575 * previous push metadata could have flag the metadata registry to
3576 * close so don't send a close command if closed.
3578 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
3579 /* And ask to close it for this session registry. */
3580 (void) close_metadata(registry
, ua_sess
->consumer
);
3583 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3585 pthread_mutex_unlock(&ua_sess
->lock
);
3588 /* Remove application from PID hash table */
3589 ret
= lttng_ht_del(ust_app_ht_by_sock
, &ust_app_sock_iter
);
3593 * Remove application from notify hash table. The thread handling the
3594 * notify socket could have deleted the node so ignore on error because
3595 * either way it's valid. The close of that socket is handled by the other
3598 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3599 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3602 * Ignore return value since the node might have been removed before by an
3603 * add replace during app registration because the PID can be reassigned by
3606 iter
.iter
.node
= <a
->pid_n
.node
;
3607 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3609 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3614 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3621 * Fill events array with all events name of all registered apps.
3623 int ust_app_list_events(struct lttng_event
**events
)
3626 size_t nbmem
, count
= 0;
3627 struct lttng_ht_iter iter
;
3628 struct ust_app
*app
;
3629 struct lttng_event
*tmp_event
;
3631 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3632 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3633 if (tmp_event
== NULL
) {
3634 PERROR("zmalloc ust app events");
3641 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3642 struct lttng_ust_tracepoint_iter uiter
;
3644 health_code_update();
3646 if (!app
->compatible
) {
3648 * TODO: In time, we should notice the caller of this error by
3649 * telling him that this is a version error.
3653 pthread_mutex_lock(&app
->sock_lock
);
3654 handle
= ustctl_tracepoint_list(app
->sock
);
3656 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3657 ERR("UST app list events getting handle failed for app pid %d",
3660 pthread_mutex_unlock(&app
->sock_lock
);
3664 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3665 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3666 /* Handle ustctl error. */
3670 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3671 ERR("UST app tp list get failed for app %d with ret %d",
3674 DBG3("UST app tp list get failed. Application is dead");
3676 * This is normal behavior, an application can die during the
3677 * creation process. Don't report an error so the execution can
3678 * continue normally. Continue normal execution.
3683 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3684 if (release_ret
< 0 &&
3685 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3686 release_ret
!= -EPIPE
) {
3687 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3689 pthread_mutex_unlock(&app
->sock_lock
);
3693 health_code_update();
3694 if (count
>= nbmem
) {
3695 /* In case the realloc fails, we free the memory */
3696 struct lttng_event
*new_tmp_event
;
3699 new_nbmem
= nbmem
<< 1;
3700 DBG2("Reallocating event list from %zu to %zu entries",
3702 new_tmp_event
= realloc(tmp_event
,
3703 new_nbmem
* sizeof(struct lttng_event
));
3704 if (new_tmp_event
== NULL
) {
3707 PERROR("realloc ust app events");
3710 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3711 if (release_ret
< 0 &&
3712 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3713 release_ret
!= -EPIPE
) {
3714 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3716 pthread_mutex_unlock(&app
->sock_lock
);
3719 /* Zero the new memory */
3720 memset(new_tmp_event
+ nbmem
, 0,
3721 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3723 tmp_event
= new_tmp_event
;
3725 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3726 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3727 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3728 tmp_event
[count
].pid
= app
->pid
;
3729 tmp_event
[count
].enabled
= -1;
3732 ret
= ustctl_release_handle(app
->sock
, handle
);
3733 pthread_mutex_unlock(&app
->sock_lock
);
3734 if (ret
< 0 && ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3735 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3740 *events
= tmp_event
;
3742 DBG2("UST app list events done (%zu events)", count
);
3747 health_code_update();
3752 * Fill events array with all events name of all registered apps.
3754 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3757 size_t nbmem
, count
= 0;
3758 struct lttng_ht_iter iter
;
3759 struct ust_app
*app
;
3760 struct lttng_event_field
*tmp_event
;
3762 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3763 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3764 if (tmp_event
== NULL
) {
3765 PERROR("zmalloc ust app event fields");
3772 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3773 struct lttng_ust_field_iter uiter
;
3775 health_code_update();
3777 if (!app
->compatible
) {
3779 * TODO: In time, we should notice the caller of this error by
3780 * telling him that this is a version error.
3784 pthread_mutex_lock(&app
->sock_lock
);
3785 handle
= ustctl_tracepoint_field_list(app
->sock
);
3787 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3788 ERR("UST app list field getting handle failed for app pid %d",
3791 pthread_mutex_unlock(&app
->sock_lock
);
3795 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3796 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3797 /* Handle ustctl error. */
3801 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3802 ERR("UST app tp list field failed for app %d with ret %d",
3805 DBG3("UST app tp list field failed. Application is dead");
3807 * This is normal behavior, an application can die during the
3808 * creation process. Don't report an error so the execution can
3809 * continue normally. Reset list and count for next app.
3814 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3815 pthread_mutex_unlock(&app
->sock_lock
);
3816 if (release_ret
< 0 &&
3817 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3818 release_ret
!= -EPIPE
) {
3819 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3824 health_code_update();
3825 if (count
>= nbmem
) {
3826 /* In case the realloc fails, we free the memory */
3827 struct lttng_event_field
*new_tmp_event
;
3830 new_nbmem
= nbmem
<< 1;
3831 DBG2("Reallocating event field list from %zu to %zu entries",
3833 new_tmp_event
= realloc(tmp_event
,
3834 new_nbmem
* sizeof(struct lttng_event_field
));
3835 if (new_tmp_event
== NULL
) {
3838 PERROR("realloc ust app event fields");
3841 release_ret
= ustctl_release_handle(app
->sock
, handle
);
3842 pthread_mutex_unlock(&app
->sock_lock
);
3844 release_ret
!= -LTTNG_UST_ERR_EXITING
&&
3845 release_ret
!= -EPIPE
) {
3846 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, release_ret
);
3850 /* Zero the new memory */
3851 memset(new_tmp_event
+ nbmem
, 0,
3852 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3854 tmp_event
= new_tmp_event
;
3857 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3858 /* Mapping between these enums matches 1 to 1. */
3859 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3860 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3862 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3863 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3864 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3865 tmp_event
[count
].event
.pid
= app
->pid
;
3866 tmp_event
[count
].event
.enabled
= -1;
3869 ret
= ustctl_release_handle(app
->sock
, handle
);
3870 pthread_mutex_unlock(&app
->sock_lock
);
3872 ret
!= -LTTNG_UST_ERR_EXITING
&&
3874 ERR("Error releasing app handle for app %d with ret %d", app
->sock
, ret
);
3879 *fields
= tmp_event
;
3881 DBG2("UST app list event fields done (%zu events)", count
);
3886 health_code_update();
3891 * Free and clean all traceable apps of the global list.
3893 * Should _NOT_ be called with RCU read-side lock held.
3895 void ust_app_clean_list(void)
3898 struct ust_app
*app
;
3899 struct lttng_ht_iter iter
;
3901 DBG2("UST app cleaning registered apps hash table");
3906 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3907 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3909 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3913 /* Cleanup socket hash table */
3914 if (ust_app_ht_by_sock
) {
3915 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3917 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3922 /* Cleanup notify socket hash table */
3923 if (ust_app_ht_by_notify_sock
) {
3924 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3925 notify_sock_n
.node
) {
3926 ret
= lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3932 /* Destroy is done only when the ht is empty */
3934 ht_cleanup_push(ust_app_ht
);
3936 if (ust_app_ht_by_sock
) {
3937 ht_cleanup_push(ust_app_ht_by_sock
);
3939 if (ust_app_ht_by_notify_sock
) {
3940 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3945 * Init UST app hash table.
3947 int ust_app_ht_alloc(void)
3949 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3953 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3954 if (!ust_app_ht_by_sock
) {
3957 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3958 if (!ust_app_ht_by_notify_sock
) {
3965 * For a specific UST session, disable the channel for all registered apps.
3967 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3968 struct ltt_ust_channel
*uchan
)
3971 struct lttng_ht_iter iter
;
3972 struct lttng_ht_node_str
*ua_chan_node
;
3973 struct ust_app
*app
;
3974 struct ust_app_session
*ua_sess
;
3975 struct ust_app_channel
*ua_chan
;
3977 if (usess
== NULL
|| uchan
== NULL
) {
3978 ERR("Disabling UST global channel with NULL values");
3983 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3984 uchan
->name
, usess
->id
);
3988 /* For every registered applications */
3989 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3990 struct lttng_ht_iter uiter
;
3991 if (!app
->compatible
) {
3993 * TODO: In time, we should notice the caller of this error by
3994 * telling him that this is a version error.
3998 ua_sess
= lookup_session_by_app(usess
, app
);
3999 if (ua_sess
== NULL
) {
4004 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4005 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4006 /* If the session if found for the app, the channel must be there */
4007 assert(ua_chan_node
);
4009 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4010 /* The channel must not be already disabled */
4011 assert(ua_chan
->enabled
== 1);
4013 /* Disable channel onto application */
4014 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
4016 /* XXX: We might want to report this error at some point... */
4028 * For a specific UST session, enable the channel for all registered apps.
4030 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
4031 struct ltt_ust_channel
*uchan
)
4034 struct lttng_ht_iter iter
;
4035 struct ust_app
*app
;
4036 struct ust_app_session
*ua_sess
;
4038 if (usess
== NULL
|| uchan
== NULL
) {
4039 ERR("Adding UST global channel to NULL values");
4044 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
4045 uchan
->name
, usess
->id
);
4049 /* For every registered applications */
4050 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4051 if (!app
->compatible
) {
4053 * TODO: In time, we should notice the caller of this error by
4054 * telling him that this is a version error.
4058 ua_sess
= lookup_session_by_app(usess
, app
);
4059 if (ua_sess
== NULL
) {
4063 /* Enable channel onto application */
4064 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
4066 /* XXX: We might want to report this error at some point... */
4078 * Disable an event in a channel and for a specific session.
4080 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
4081 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4084 struct lttng_ht_iter iter
, uiter
;
4085 struct lttng_ht_node_str
*ua_chan_node
;
4086 struct ust_app
*app
;
4087 struct ust_app_session
*ua_sess
;
4088 struct ust_app_channel
*ua_chan
;
4089 struct ust_app_event
*ua_event
;
4091 DBG("UST app disabling event %s for all apps in channel "
4092 "%s for session id %" PRIu64
,
4093 uevent
->attr
.name
, uchan
->name
, usess
->id
);
4097 /* For all registered applications */
4098 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4099 if (!app
->compatible
) {
4101 * TODO: In time, we should notice the caller of this error by
4102 * telling him that this is a version error.
4106 ua_sess
= lookup_session_by_app(usess
, app
);
4107 if (ua_sess
== NULL
) {
4112 /* Lookup channel in the ust app session */
4113 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4114 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4115 if (ua_chan_node
== NULL
) {
4116 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
4117 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
4120 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4122 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4123 uevent
->filter
, uevent
->attr
.loglevel
,
4125 if (ua_event
== NULL
) {
4126 DBG2("Event %s not found in channel %s for app pid %d."
4127 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
4131 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
4133 /* XXX: Report error someday... */
4144 * For a specific UST session, create the channel for all registered apps.
4146 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
4147 struct ltt_ust_channel
*uchan
)
4149 int ret
= 0, created
;
4150 struct lttng_ht_iter iter
;
4151 struct ust_app
*app
;
4152 struct ust_app_session
*ua_sess
= NULL
;
4154 /* Very wrong code flow */
4158 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64
,
4159 uchan
->name
, usess
->id
);
4163 /* For every registered applications */
4164 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4165 if (!app
->compatible
) {
4167 * TODO: In time, we should notice the caller of this error by
4168 * telling him that this is a version error.
4172 if (!trace_ust_pid_tracker_lookup(usess
, app
->pid
)) {
4178 * Create session on the tracer side and add it to app session HT. Note
4179 * that if session exist, it will simply return a pointer to the ust
4182 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
4187 * The application's socket is not valid. Either a bad socket
4188 * or a timeout on it. We can't inform the caller that for a
4189 * specific app, the session failed so lets continue here.
4191 ret
= 0; /* Not an error. */
4195 goto error_rcu_unlock
;
4200 pthread_mutex_lock(&ua_sess
->lock
);
4202 if (ua_sess
->deleted
) {
4203 pthread_mutex_unlock(&ua_sess
->lock
);
4207 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
4208 sizeof(uchan
->name
))) {
4209 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
, &uchan
->attr
);
4212 /* Create channel onto application. We don't need the chan ref. */
4213 ret
= create_ust_app_channel(ua_sess
, uchan
, app
,
4214 LTTNG_UST_CHAN_PER_CPU
, usess
, NULL
);
4216 pthread_mutex_unlock(&ua_sess
->lock
);
4218 /* Cleanup the created session if it's the case. */
4220 destroy_app_session(app
, ua_sess
);
4225 * The application's socket is not valid. Either a bad socket
4226 * or a timeout on it. We can't inform the caller that for a
4227 * specific app, the session failed so lets continue here.
4229 ret
= 0; /* Not an error. */
4233 goto error_rcu_unlock
;
4244 * Enable event for a specific session and channel on the tracer.
4246 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
4247 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4250 struct lttng_ht_iter iter
, uiter
;
4251 struct lttng_ht_node_str
*ua_chan_node
;
4252 struct ust_app
*app
;
4253 struct ust_app_session
*ua_sess
;
4254 struct ust_app_channel
*ua_chan
;
4255 struct ust_app_event
*ua_event
;
4257 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
4258 uevent
->attr
.name
, usess
->id
);
4261 * NOTE: At this point, this function is called only if the session and
4262 * channel passed are already created for all apps. and enabled on the
4268 /* For all registered applications */
4269 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4270 if (!app
->compatible
) {
4272 * TODO: In time, we should notice the caller of this error by
4273 * telling him that this is a version error.
4277 ua_sess
= lookup_session_by_app(usess
, app
);
4279 /* The application has problem or is probably dead. */
4283 pthread_mutex_lock(&ua_sess
->lock
);
4285 if (ua_sess
->deleted
) {
4286 pthread_mutex_unlock(&ua_sess
->lock
);
4290 /* Lookup channel in the ust app session */
4291 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4292 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4294 * It is possible that the channel cannot be found is
4295 * the channel/event creation occurs concurrently with
4296 * an application exit.
4298 if (!ua_chan_node
) {
4299 pthread_mutex_unlock(&ua_sess
->lock
);
4303 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4305 /* Get event node */
4306 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4307 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4308 if (ua_event
== NULL
) {
4309 DBG3("UST app enable event %s not found for app PID %d."
4310 "Skipping app", uevent
->attr
.name
, app
->pid
);
4314 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4316 pthread_mutex_unlock(&ua_sess
->lock
);
4320 pthread_mutex_unlock(&ua_sess
->lock
);
4329 * For a specific existing UST session and UST channel, creates the event for
4330 * all registered apps.
4332 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
4333 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
4336 struct lttng_ht_iter iter
, uiter
;
4337 struct lttng_ht_node_str
*ua_chan_node
;
4338 struct ust_app
*app
;
4339 struct ust_app_session
*ua_sess
;
4340 struct ust_app_channel
*ua_chan
;
4342 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
4343 uevent
->attr
.name
, usess
->id
);
4347 /* For all registered applications */
4348 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4349 if (!app
->compatible
) {
4351 * TODO: In time, we should notice the caller of this error by
4352 * telling him that this is a version error.
4356 ua_sess
= lookup_session_by_app(usess
, app
);
4358 /* The application has problem or is probably dead. */
4362 pthread_mutex_lock(&ua_sess
->lock
);
4364 if (ua_sess
->deleted
) {
4365 pthread_mutex_unlock(&ua_sess
->lock
);
4369 /* Lookup channel in the ust app session */
4370 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4371 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4372 /* If the channel is not found, there is a code flow error */
4373 assert(ua_chan_node
);
4375 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4377 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4378 pthread_mutex_unlock(&ua_sess
->lock
);
4380 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
4381 /* Possible value at this point: -ENOMEM. If so, we stop! */
4384 DBG2("UST app event %s already exist on app PID %d",
4385 uevent
->attr
.name
, app
->pid
);
4396 * Start tracing for a specific UST session and app.
4398 * Called with UST app session lock held.
4402 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4405 struct ust_app_session
*ua_sess
;
4407 DBG("Starting tracing for ust app pid %d", app
->pid
);
4411 if (!app
->compatible
) {
4415 ua_sess
= lookup_session_by_app(usess
, app
);
4416 if (ua_sess
== NULL
) {
4417 /* The session is in teardown process. Ignore and continue. */
4421 pthread_mutex_lock(&ua_sess
->lock
);
4423 if (ua_sess
->deleted
) {
4424 pthread_mutex_unlock(&ua_sess
->lock
);
4428 /* Upon restart, we skip the setup, already done */
4429 if (ua_sess
->started
) {
4433 /* Create directories if consumer is LOCAL and has a path defined. */
4434 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
4435 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
4436 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
4437 S_IRWXU
| S_IRWXG
, ua_sess
->euid
, ua_sess
->egid
);
4439 if (errno
!= EEXIST
) {
4440 ERR("Trace directory creation error");
4447 * Create the metadata for the application. This returns gracefully if a
4448 * metadata was already set for the session.
4450 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
4455 health_code_update();
4458 /* This start the UST tracing */
4459 pthread_mutex_lock(&app
->sock_lock
);
4460 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
4461 pthread_mutex_unlock(&app
->sock_lock
);
4463 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4464 ERR("Error starting tracing for app pid: %d (ret: %d)",
4467 DBG("UST app start session failed. Application is dead.");
4469 * This is normal behavior, an application can die during the
4470 * creation process. Don't report an error so the execution can
4471 * continue normally.
4473 pthread_mutex_unlock(&ua_sess
->lock
);
4479 /* Indicate that the session has been started once */
4480 ua_sess
->started
= 1;
4482 pthread_mutex_unlock(&ua_sess
->lock
);
4484 health_code_update();
4486 /* Quiescent wait after starting trace */
4487 pthread_mutex_lock(&app
->sock_lock
);
4488 ret
= ustctl_wait_quiescent(app
->sock
);
4489 pthread_mutex_unlock(&app
->sock_lock
);
4490 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4491 ERR("UST app wait quiescent failed for app pid %d ret %d",
4497 health_code_update();
4501 pthread_mutex_unlock(&ua_sess
->lock
);
4503 health_code_update();
4508 * Stop tracing for a specific UST session and app.
4511 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4514 struct ust_app_session
*ua_sess
;
4515 struct ust_registry_session
*registry
;
4517 DBG("Stopping tracing for ust app pid %d", app
->pid
);
4521 if (!app
->compatible
) {
4522 goto end_no_session
;
4525 ua_sess
= lookup_session_by_app(usess
, app
);
4526 if (ua_sess
== NULL
) {
4527 goto end_no_session
;
4530 pthread_mutex_lock(&ua_sess
->lock
);
4532 if (ua_sess
->deleted
) {
4533 pthread_mutex_unlock(&ua_sess
->lock
);
4534 goto end_no_session
;
4538 * If started = 0, it means that stop trace has been called for a session
4539 * that was never started. It's possible since we can have a fail start
4540 * from either the application manager thread or the command thread. Simply
4541 * indicate that this is a stop error.
4543 if (!ua_sess
->started
) {
4544 goto error_rcu_unlock
;
4547 health_code_update();
4549 /* This inhibits UST tracing */
4550 pthread_mutex_lock(&app
->sock_lock
);
4551 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
4552 pthread_mutex_unlock(&app
->sock_lock
);
4554 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4555 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4558 DBG("UST app stop session failed. Application is dead.");
4560 * This is normal behavior, an application can die during the
4561 * creation process. Don't report an error so the execution can
4562 * continue normally.
4566 goto error_rcu_unlock
;
4569 health_code_update();
4571 /* Quiescent wait after stopping trace */
4572 pthread_mutex_lock(&app
->sock_lock
);
4573 ret
= ustctl_wait_quiescent(app
->sock
);
4574 pthread_mutex_unlock(&app
->sock_lock
);
4575 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4576 ERR("UST app wait quiescent failed for app pid %d ret %d",
4580 health_code_update();
4582 registry
= get_session_registry(ua_sess
);
4584 /* The UST app session is held registry shall not be null. */
4587 /* Push metadata for application before freeing the application. */
4588 (void) push_metadata(registry
, ua_sess
->consumer
);
4591 pthread_mutex_unlock(&ua_sess
->lock
);
4594 health_code_update();
4598 pthread_mutex_unlock(&ua_sess
->lock
);
4600 health_code_update();
4605 int ust_app_flush_app_session(struct ust_app
*app
,
4606 struct ust_app_session
*ua_sess
)
4608 int ret
, retval
= 0;
4609 struct lttng_ht_iter iter
;
4610 struct ust_app_channel
*ua_chan
;
4611 struct consumer_socket
*socket
;
4613 DBG("Flushing app session buffers for ust app pid %d", app
->pid
);
4617 if (!app
->compatible
) {
4618 goto end_not_compatible
;
4621 pthread_mutex_lock(&ua_sess
->lock
);
4623 if (ua_sess
->deleted
) {
4627 health_code_update();
4629 /* Flushing buffers */
4630 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4633 /* Flush buffers and push metadata. */
4634 switch (ua_sess
->buffer_type
) {
4635 case LTTNG_BUFFER_PER_PID
:
4636 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4638 health_code_update();
4639 ret
= consumer_flush_channel(socket
, ua_chan
->key
);
4641 ERR("Error flushing consumer channel");
4647 case LTTNG_BUFFER_PER_UID
:
4653 health_code_update();
4656 pthread_mutex_unlock(&ua_sess
->lock
);
4660 health_code_update();
4665 * Flush buffers for all applications for a specific UST session.
4666 * Called with UST session lock held.
4669 int ust_app_flush_session(struct ltt_ust_session
*usess
)
4674 DBG("Flushing session buffers for all ust apps");
4678 /* Flush buffers and push metadata. */
4679 switch (usess
->buffer_type
) {
4680 case LTTNG_BUFFER_PER_UID
:
4682 struct buffer_reg_uid
*reg
;
4683 struct lttng_ht_iter iter
;
4685 /* Flush all per UID buffers associated to that session. */
4686 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4687 struct ust_registry_session
*ust_session_reg
;
4688 struct buffer_reg_channel
*reg_chan
;
4689 struct consumer_socket
*socket
;
4691 /* Get consumer socket to use to push the metadata.*/
4692 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4695 /* Ignore request if no consumer is found for the session. */
4699 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4700 reg_chan
, node
.node
) {
4702 * The following call will print error values so the return
4703 * code is of little importance because whatever happens, we
4704 * have to try them all.
4706 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4709 ust_session_reg
= reg
->registry
->reg
.ust
;
4710 /* Push metadata. */
4711 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4715 case LTTNG_BUFFER_PER_PID
:
4717 struct ust_app_session
*ua_sess
;
4718 struct lttng_ht_iter iter
;
4719 struct ust_app
*app
;
4721 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4722 ua_sess
= lookup_session_by_app(usess
, app
);
4723 if (ua_sess
== NULL
) {
4726 (void) ust_app_flush_app_session(app
, ua_sess
);
4737 health_code_update();
4742 int ust_app_clear_quiescent_app_session(struct ust_app
*app
,
4743 struct ust_app_session
*ua_sess
)
4746 struct lttng_ht_iter iter
;
4747 struct ust_app_channel
*ua_chan
;
4748 struct consumer_socket
*socket
;
4750 DBG("Clearing stream quiescent state for ust app pid %d", app
->pid
);
4754 if (!app
->compatible
) {
4755 goto end_not_compatible
;
4758 pthread_mutex_lock(&ua_sess
->lock
);
4760 if (ua_sess
->deleted
) {
4764 health_code_update();
4766 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4769 ERR("Failed to find consumer (%" PRIu32
") socket",
4770 app
->bits_per_long
);
4775 /* Clear quiescent state. */
4776 switch (ua_sess
->buffer_type
) {
4777 case LTTNG_BUFFER_PER_PID
:
4778 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
,
4779 ua_chan
, node
.node
) {
4780 health_code_update();
4781 ret
= consumer_clear_quiescent_channel(socket
,
4784 ERR("Error clearing quiescent state for consumer channel");
4790 case LTTNG_BUFFER_PER_UID
:
4797 health_code_update();
4800 pthread_mutex_unlock(&ua_sess
->lock
);
4804 health_code_update();
4809 * Clear quiescent state in each stream for all applications for a
4810 * specific UST session.
4811 * Called with UST session lock held.
4814 int ust_app_clear_quiescent_session(struct ltt_ust_session
*usess
)
4819 DBG("Clearing stream quiescent state for all ust apps");
4823 switch (usess
->buffer_type
) {
4824 case LTTNG_BUFFER_PER_UID
:
4826 struct lttng_ht_iter iter
;
4827 struct buffer_reg_uid
*reg
;
4830 * Clear quiescent for all per UID buffers associated to
4833 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4834 struct consumer_socket
*socket
;
4835 struct buffer_reg_channel
*reg_chan
;
4837 /* Get associated consumer socket.*/
4838 socket
= consumer_find_socket_by_bitness(
4839 reg
->bits_per_long
, usess
->consumer
);
4842 * Ignore request if no consumer is found for
4848 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
,
4849 &iter
.iter
, reg_chan
, node
.node
) {
4851 * The following call will print error values so
4852 * the return code is of little importance
4853 * because whatever happens, we have to try them
4856 (void) consumer_clear_quiescent_channel(socket
,
4857 reg_chan
->consumer_key
);
4862 case LTTNG_BUFFER_PER_PID
:
4864 struct ust_app_session
*ua_sess
;
4865 struct lttng_ht_iter iter
;
4866 struct ust_app
*app
;
4868 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
,
4870 ua_sess
= lookup_session_by_app(usess
, app
);
4871 if (ua_sess
== NULL
) {
4874 (void) ust_app_clear_quiescent_app_session(app
,
4886 health_code_update();
4891 * Destroy a specific UST session in apps.
4893 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4896 struct ust_app_session
*ua_sess
;
4897 struct lttng_ht_iter iter
;
4898 struct lttng_ht_node_u64
*node
;
4900 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4904 if (!app
->compatible
) {
4908 __lookup_session_by_app(usess
, app
, &iter
);
4909 node
= lttng_ht_iter_get_node_u64(&iter
);
4911 /* Session is being or is deleted. */
4914 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4916 health_code_update();
4917 destroy_app_session(app
, ua_sess
);
4919 health_code_update();
4921 /* Quiescent wait after stopping trace */
4922 pthread_mutex_lock(&app
->sock_lock
);
4923 ret
= ustctl_wait_quiescent(app
->sock
);
4924 pthread_mutex_unlock(&app
->sock_lock
);
4925 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4926 ERR("UST app wait quiescent failed for app pid %d ret %d",
4931 health_code_update();
4936 * Start tracing for the UST session.
4938 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4941 struct lttng_ht_iter iter
;
4942 struct ust_app
*app
;
4944 DBG("Starting all UST traces");
4949 * In a start-stop-start use-case, we need to clear the quiescent state
4950 * of each channel set by the prior stop command, thus ensuring that a
4951 * following stop or destroy is sure to grab a timestamp_end near those
4952 * operations, even if the packet is empty.
4954 (void) ust_app_clear_quiescent_session(usess
);
4956 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4957 ret
= ust_app_start_trace(usess
, app
);
4959 /* Continue to next apps even on error */
4970 * Start tracing for the UST session.
4971 * Called with UST session lock held.
4973 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4976 struct lttng_ht_iter iter
;
4977 struct ust_app
*app
;
4979 DBG("Stopping all UST traces");
4983 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4984 ret
= ust_app_stop_trace(usess
, app
);
4986 /* Continue to next apps even on error */
4991 (void) ust_app_flush_session(usess
);
4999 * Destroy app UST session.
5001 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
5004 struct lttng_ht_iter iter
;
5005 struct ust_app
*app
;
5007 DBG("Destroy all UST traces");
5011 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5012 ret
= destroy_trace(usess
, app
);
5014 /* Continue to next apps even on error */
5025 void ust_app_global_create(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5028 struct lttng_ht_iter iter
, uiter
;
5029 struct ust_app_session
*ua_sess
= NULL
;
5030 struct ust_app_channel
*ua_chan
;
5031 struct ust_app_event
*ua_event
;
5032 struct ust_app_ctx
*ua_ctx
;
5035 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &is_created
);
5037 /* Tracer is probably gone or ENOMEM. */
5041 /* App session already created. */
5046 pthread_mutex_lock(&ua_sess
->lock
);
5048 if (ua_sess
->deleted
) {
5049 pthread_mutex_unlock(&ua_sess
->lock
);
5054 * We can iterate safely here over all UST app session since the create ust
5055 * app session above made a shadow copy of the UST global domain from the
5058 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
5060 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
5061 if (ret
< 0 && ret
!= -ENOTCONN
) {
5063 * Stop everything. On error, the application
5064 * failed, no more file descriptor are available
5065 * or ENOMEM so stopping here is the only thing
5066 * we can do for now. The only exception is
5067 * -ENOTCONN, which indicates that the application
5074 * Add context using the list so they are enabled in the same order the
5077 cds_list_for_each_entry(ua_ctx
, &ua_chan
->ctx_list
, list
) {
5078 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
5085 /* For each events */
5086 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
5088 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
5095 pthread_mutex_unlock(&ua_sess
->lock
);
5097 if (usess
->active
) {
5098 ret
= ust_app_start_trace(usess
, app
);
5103 DBG2("UST trace started for app pid %d", app
->pid
);
5106 /* Everything went well at this point. */
5110 pthread_mutex_unlock(&ua_sess
->lock
);
5113 destroy_app_session(app
, ua_sess
);
5119 void ust_app_global_destroy(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5121 struct ust_app_session
*ua_sess
;
5123 ua_sess
= lookup_session_by_app(usess
, app
);
5124 if (ua_sess
== NULL
) {
5127 destroy_app_session(app
, ua_sess
);
5131 * Add channels/events from UST global domain to registered apps at sock.
5133 * Called with session lock held.
5134 * Called with RCU read-side lock held.
5136 void ust_app_global_update(struct ltt_ust_session
*usess
, struct ust_app
*app
)
5140 DBG2("UST app global update for app sock %d for session id %" PRIu64
,
5141 app
->sock
, usess
->id
);
5143 if (!app
->compatible
) {
5147 if (trace_ust_pid_tracker_lookup(usess
, app
->pid
)) {
5148 ust_app_global_create(usess
, app
);
5150 ust_app_global_destroy(usess
, app
);
5155 * Called with session lock held.
5157 void ust_app_global_update_all(struct ltt_ust_session
*usess
)
5159 struct lttng_ht_iter iter
;
5160 struct ust_app
*app
;
5163 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5164 ust_app_global_update(usess
, app
);
5170 * Add context to a specific channel for global UST domain.
5172 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
5173 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
5176 struct lttng_ht_node_str
*ua_chan_node
;
5177 struct lttng_ht_iter iter
, uiter
;
5178 struct ust_app_channel
*ua_chan
= NULL
;
5179 struct ust_app_session
*ua_sess
;
5180 struct ust_app
*app
;
5184 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5185 if (!app
->compatible
) {
5187 * TODO: In time, we should notice the caller of this error by
5188 * telling him that this is a version error.
5192 ua_sess
= lookup_session_by_app(usess
, app
);
5193 if (ua_sess
== NULL
) {
5197 pthread_mutex_lock(&ua_sess
->lock
);
5199 if (ua_sess
->deleted
) {
5200 pthread_mutex_unlock(&ua_sess
->lock
);
5204 /* Lookup channel in the ust app session */
5205 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
5206 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
5207 if (ua_chan_node
== NULL
) {
5210 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
5212 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
5217 pthread_mutex_unlock(&ua_sess
->lock
);
5225 * Enable event for a channel from a UST session for a specific PID.
5227 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
5228 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
5231 struct lttng_ht_iter iter
;
5232 struct lttng_ht_node_str
*ua_chan_node
;
5233 struct ust_app
*app
;
5234 struct ust_app_session
*ua_sess
;
5235 struct ust_app_channel
*ua_chan
;
5236 struct ust_app_event
*ua_event
;
5238 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
5242 app
= ust_app_find_by_pid(pid
);
5244 ERR("UST app enable event per PID %d not found", pid
);
5249 if (!app
->compatible
) {
5254 ua_sess
= lookup_session_by_app(usess
, app
);
5256 /* The application has problem or is probably dead. */
5261 pthread_mutex_lock(&ua_sess
->lock
);
5263 if (ua_sess
->deleted
) {
5268 /* Lookup channel in the ust app session */
5269 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
5270 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
5271 /* If the channel is not found, there is a code flow error */
5272 assert(ua_chan_node
);
5274 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
5276 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
5277 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
5278 if (ua_event
== NULL
) {
5279 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
5284 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
5291 pthread_mutex_unlock(&ua_sess
->lock
);
5298 * Receive registration and populate the given msg structure.
5300 * On success return 0 else a negative value returned by the ustctl call.
5302 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
5305 uint32_t pid
, ppid
, uid
, gid
;
5309 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
5310 &pid
, &ppid
, &uid
, &gid
,
5311 &msg
->bits_per_long
,
5312 &msg
->uint8_t_alignment
,
5313 &msg
->uint16_t_alignment
,
5314 &msg
->uint32_t_alignment
,
5315 &msg
->uint64_t_alignment
,
5316 &msg
->long_alignment
,
5323 case LTTNG_UST_ERR_EXITING
:
5324 DBG3("UST app recv reg message failed. Application died");
5326 case LTTNG_UST_ERR_UNSUP_MAJOR
:
5327 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
5328 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
5329 LTTNG_UST_ABI_MINOR_VERSION
);
5332 ERR("UST app recv reg message failed with ret %d", ret
);
5337 msg
->pid
= (pid_t
) pid
;
5338 msg
->ppid
= (pid_t
) ppid
;
5339 msg
->uid
= (uid_t
) uid
;
5340 msg
->gid
= (gid_t
) gid
;
5347 * Return a ust app session object using the application object and the
5348 * session object descriptor has a key. If not found, NULL is returned.
5349 * A RCU read side lock MUST be acquired when calling this function.
5351 static struct ust_app_session
*find_session_by_objd(struct ust_app
*app
,
5354 struct lttng_ht_node_ulong
*node
;
5355 struct lttng_ht_iter iter
;
5356 struct ust_app_session
*ua_sess
= NULL
;
5360 lttng_ht_lookup(app
->ust_sessions_objd
, (void *)((unsigned long) objd
), &iter
);
5361 node
= lttng_ht_iter_get_node_ulong(&iter
);
5363 DBG2("UST app session find by objd %d not found", objd
);
5367 ua_sess
= caa_container_of(node
, struct ust_app_session
, ust_objd_node
);
5374 * Return a ust app channel object using the application object and the channel
5375 * object descriptor has a key. If not found, NULL is returned. A RCU read side
5376 * lock MUST be acquired before calling this function.
5378 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
5381 struct lttng_ht_node_ulong
*node
;
5382 struct lttng_ht_iter iter
;
5383 struct ust_app_channel
*ua_chan
= NULL
;
5387 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
5388 node
= lttng_ht_iter_get_node_ulong(&iter
);
5390 DBG2("UST app channel find by objd %d not found", objd
);
5394 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
5401 * Reply to a register channel notification from an application on the notify
5402 * socket. The channel metadata is also created.
5404 * The session UST registry lock is acquired in this function.
5406 * On success 0 is returned else a negative value.
5408 static int reply_ust_register_channel(int sock
, int sobjd
, int cobjd
,
5409 size_t nr_fields
, struct ustctl_field
*fields
)
5411 int ret
, ret_code
= 0;
5413 uint64_t chan_reg_key
;
5414 enum ustctl_channel_header type
;
5415 struct ust_app
*app
;
5416 struct ust_app_channel
*ua_chan
;
5417 struct ust_app_session
*ua_sess
;
5418 struct ust_registry_session
*registry
;
5419 struct ust_registry_channel
*chan_reg
;
5423 /* Lookup application. If not found, there is a code flow error. */
5424 app
= find_app_by_notify_sock(sock
);
5426 DBG("Application socket %d is being torn down. Abort event notify",
5429 goto error_rcu_unlock
;
5432 /* Lookup channel by UST object descriptor. */
5433 ua_chan
= find_channel_by_objd(app
, cobjd
);
5435 DBG("Application channel is being torn down. Abort event notify");
5437 goto error_rcu_unlock
;
5440 assert(ua_chan
->session
);
5441 ua_sess
= ua_chan
->session
;
5443 /* Get right session registry depending on the session buffer type. */
5444 registry
= get_session_registry(ua_sess
);
5446 DBG("Application session is being torn down. Abort event notify");
5448 goto error_rcu_unlock
;
5451 /* Depending on the buffer type, a different channel key is used. */
5452 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5453 chan_reg_key
= ua_chan
->tracing_channel_id
;
5455 chan_reg_key
= ua_chan
->key
;
5458 pthread_mutex_lock(®istry
->lock
);
5460 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
5463 if (!chan_reg
->register_done
) {
5465 * TODO: eventually use the registry event count for
5466 * this channel to better guess header type for per-pid
5469 type
= USTCTL_CHANNEL_HEADER_LARGE
;
5470 chan_reg
->nr_ctx_fields
= nr_fields
;
5471 chan_reg
->ctx_fields
= fields
;
5473 chan_reg
->header_type
= type
;
5475 /* Get current already assigned values. */
5476 type
= chan_reg
->header_type
;
5478 /* Channel id is set during the object creation. */
5479 chan_id
= chan_reg
->chan_id
;
5481 /* Append to metadata */
5482 if (!chan_reg
->metadata_dumped
) {
5483 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
5485 ERR("Error appending channel metadata (errno = %d)", ret_code
);
5491 DBG3("UST app replying to register channel key %" PRIu64
5492 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
5495 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
5497 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5498 ERR("UST app reply channel failed with ret %d", ret
);
5500 DBG3("UST app reply channel failed. Application died");
5505 /* This channel registry registration is completed. */
5506 chan_reg
->register_done
= 1;
5509 pthread_mutex_unlock(®istry
->lock
);
5517 * Add event to the UST channel registry. When the event is added to the
5518 * registry, the metadata is also created. Once done, this replies to the
5519 * application with the appropriate error code.
5521 * The session UST registry lock is acquired in the function.
5523 * On success 0 is returned else a negative value.
5525 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
5526 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
,
5527 int loglevel_value
, char *model_emf_uri
)
5530 uint32_t event_id
= 0;
5531 uint64_t chan_reg_key
;
5532 struct ust_app
*app
;
5533 struct ust_app_channel
*ua_chan
;
5534 struct ust_app_session
*ua_sess
;
5535 struct ust_registry_session
*registry
;
5539 /* Lookup application. If not found, there is a code flow error. */
5540 app
= find_app_by_notify_sock(sock
);
5542 DBG("Application socket %d is being torn down. Abort event notify",
5545 goto error_rcu_unlock
;
5548 /* Lookup channel by UST object descriptor. */
5549 ua_chan
= find_channel_by_objd(app
, cobjd
);
5551 DBG("Application channel is being torn down. Abort event notify");
5553 goto error_rcu_unlock
;
5556 assert(ua_chan
->session
);
5557 ua_sess
= ua_chan
->session
;
5559 registry
= get_session_registry(ua_sess
);
5561 DBG("Application session is being torn down. Abort event notify");
5563 goto error_rcu_unlock
;
5566 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
5567 chan_reg_key
= ua_chan
->tracing_channel_id
;
5569 chan_reg_key
= ua_chan
->key
;
5572 pthread_mutex_lock(®istry
->lock
);
5575 * From this point on, this call acquires the ownership of the sig, fields
5576 * and model_emf_uri meaning any free are done inside it if needed. These
5577 * three variables MUST NOT be read/write after this.
5579 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
5580 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
,
5581 loglevel_value
, model_emf_uri
, ua_sess
->buffer_type
,
5585 model_emf_uri
= NULL
;
5588 * The return value is returned to ustctl so in case of an error, the
5589 * application can be notified. In case of an error, it's important not to
5590 * return a negative error or else the application will get closed.
5592 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
5594 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5595 ERR("UST app reply event failed with ret %d", ret
);
5597 DBG3("UST app reply event failed. Application died");
5600 * No need to wipe the create event since the application socket will
5601 * get close on error hence cleaning up everything by itself.
5606 DBG3("UST registry event %s with id %" PRId32
" added successfully",
5610 pthread_mutex_unlock(®istry
->lock
);
5615 free(model_emf_uri
);
5620 * Add enum to the UST session registry. Once done, this replies to the
5621 * application with the appropriate error code.
5623 * The session UST registry lock is acquired within this function.
5625 * On success 0 is returned else a negative value.
5627 static int add_enum_ust_registry(int sock
, int sobjd
, char *name
,
5628 struct ustctl_enum_entry
*entries
, size_t nr_entries
)
5630 int ret
= 0, ret_code
;
5631 struct ust_app
*app
;
5632 struct ust_app_session
*ua_sess
;
5633 struct ust_registry_session
*registry
;
5634 uint64_t enum_id
= -1ULL;
5638 /* Lookup application. If not found, there is a code flow error. */
5639 app
= find_app_by_notify_sock(sock
);
5641 /* Return an error since this is not an error */
5642 DBG("Application socket %d is being torn down. Aborting enum registration",
5645 goto error_rcu_unlock
;
5648 /* Lookup session by UST object descriptor. */
5649 ua_sess
= find_session_by_objd(app
, sobjd
);
5651 /* Return an error since this is not an error */
5652 DBG("Application session is being torn down (session not found). Aborting enum registration.");
5654 goto error_rcu_unlock
;
5657 registry
= get_session_registry(ua_sess
);
5659 DBG("Application session is being torn down (registry not found). Aborting enum registration.");
5661 goto error_rcu_unlock
;
5664 pthread_mutex_lock(®istry
->lock
);
5667 * From this point on, the callee acquires the ownership of
5668 * entries. The variable entries MUST NOT be read/written after
5671 ret_code
= ust_registry_create_or_find_enum(registry
, sobjd
, name
,
5672 entries
, nr_entries
, &enum_id
);
5676 * The return value is returned to ustctl so in case of an error, the
5677 * application can be notified. In case of an error, it's important not to
5678 * return a negative error or else the application will get closed.
5680 ret
= ustctl_reply_register_enum(sock
, enum_id
, ret_code
);
5682 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5683 ERR("UST app reply enum failed with ret %d", ret
);
5685 DBG3("UST app reply enum failed. Application died");
5688 * No need to wipe the create enum since the application socket will
5689 * get close on error hence cleaning up everything by itself.
5694 DBG3("UST registry enum %s added successfully or already found", name
);
5697 pthread_mutex_unlock(®istry
->lock
);
5704 * Handle application notification through the given notify socket.
5706 * Return 0 on success or else a negative value.
5708 int ust_app_recv_notify(int sock
)
5711 enum ustctl_notify_cmd cmd
;
5713 DBG3("UST app receiving notify from sock %d", sock
);
5715 ret
= ustctl_recv_notify(sock
, &cmd
);
5717 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5718 ERR("UST app recv notify failed with ret %d", ret
);
5720 DBG3("UST app recv notify failed. Application died");
5726 case USTCTL_NOTIFY_CMD_EVENT
:
5728 int sobjd
, cobjd
, loglevel_value
;
5729 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
5731 struct ustctl_field
*fields
;
5733 DBG2("UST app ustctl register event received");
5735 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
,
5736 &loglevel_value
, &sig
, &nr_fields
, &fields
,
5739 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5740 ERR("UST app recv event failed with ret %d", ret
);
5742 DBG3("UST app recv event failed. Application died");
5748 * Add event to the UST registry coming from the notify socket. This
5749 * call will free if needed the sig, fields and model_emf_uri. This
5750 * code path loses the ownsership of these variables and transfer them
5751 * to the this function.
5753 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
5754 fields
, loglevel_value
, model_emf_uri
);
5761 case USTCTL_NOTIFY_CMD_CHANNEL
:
5765 struct ustctl_field
*fields
;
5767 DBG2("UST app ustctl register channel received");
5769 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
5772 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5773 ERR("UST app recv channel failed with ret %d", ret
);
5775 DBG3("UST app recv channel failed. Application died");
5781 * The fields ownership are transfered to this function call meaning
5782 * that if needed it will be freed. After this, it's invalid to access
5783 * fields or clean it up.
5785 ret
= reply_ust_register_channel(sock
, sobjd
, cobjd
, nr_fields
,
5793 case USTCTL_NOTIFY_CMD_ENUM
:
5796 char name
[LTTNG_UST_SYM_NAME_LEN
];
5798 struct ustctl_enum_entry
*entries
;
5800 DBG2("UST app ustctl register enum received");
5802 ret
= ustctl_recv_register_enum(sock
, &sobjd
, name
,
5803 &entries
, &nr_entries
);
5805 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
5806 ERR("UST app recv enum failed with ret %d", ret
);
5808 DBG3("UST app recv enum failed. Application died");
5813 /* Callee assumes ownership of entries */
5814 ret
= add_enum_ust_registry(sock
, sobjd
, name
,
5815 entries
, nr_entries
);
5823 /* Should NEVER happen. */
5832 * Once the notify socket hangs up, this is called. First, it tries to find the
5833 * corresponding application. On failure, the call_rcu to close the socket is
5834 * executed. If an application is found, it tries to delete it from the notify
5835 * socket hash table. Whathever the result, it proceeds to the call_rcu.
5837 * Note that an object needs to be allocated here so on ENOMEM failure, the
5838 * call RCU is not done but the rest of the cleanup is.
5840 void ust_app_notify_sock_unregister(int sock
)
5843 struct lttng_ht_iter iter
;
5844 struct ust_app
*app
;
5845 struct ust_app_notify_sock_obj
*obj
;
5851 obj
= zmalloc(sizeof(*obj
));
5854 * An ENOMEM is kind of uncool. If this strikes we continue the
5855 * procedure but the call_rcu will not be called. In this case, we
5856 * accept the fd leak rather than possibly creating an unsynchronized
5857 * state between threads.
5859 * TODO: The notify object should be created once the notify socket is
5860 * registered and stored independantely from the ust app object. The
5861 * tricky part is to synchronize the teardown of the application and
5862 * this notify object. Let's keep that in mind so we can avoid this
5863 * kind of shenanigans with ENOMEM in the teardown path.
5870 DBG("UST app notify socket unregister %d", sock
);
5873 * Lookup application by notify socket. If this fails, this means that the
5874 * hash table delete has already been done by the application
5875 * unregistration process so we can safely close the notify socket in a
5878 app
= find_app_by_notify_sock(sock
);
5883 iter
.iter
.node
= &app
->notify_sock_n
.node
;
5886 * Whatever happens here either we fail or succeed, in both cases we have
5887 * to close the socket after a grace period to continue to the call RCU
5888 * here. If the deletion is successful, the application is not visible
5889 * anymore by other threads and is it fails it means that it was already
5890 * deleted from the hash table so either way we just have to close the
5893 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
5899 * Close socket after a grace period to avoid for the socket to be reused
5900 * before the application object is freed creating potential race between
5901 * threads trying to add unique in the global hash table.
5904 call_rcu(&obj
->head
, close_notify_sock_rcu
);
5909 * Destroy a ust app data structure and free its memory.
5911 void ust_app_destroy(struct ust_app
*app
)
5917 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
5921 * Take a snapshot for a given UST session. The snapshot is sent to the given
5924 * Return 0 on success or else a negative value.
5926 int ust_app_snapshot_record(struct ltt_ust_session
*usess
,
5927 struct snapshot_output
*output
, int wait
,
5928 uint64_t nb_packets_per_stream
)
5931 struct lttng_ht_iter iter
;
5932 struct ust_app
*app
;
5933 char pathname
[PATH_MAX
];
5940 switch (usess
->buffer_type
) {
5941 case LTTNG_BUFFER_PER_UID
:
5943 struct buffer_reg_uid
*reg
;
5945 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5946 struct buffer_reg_channel
*reg_chan
;
5947 struct consumer_socket
*socket
;
5949 if (!reg
->registry
->reg
.ust
->metadata_key
) {
5950 /* Skip since no metadata is present */
5954 /* Get consumer socket to use to push the metadata.*/
5955 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5962 memset(pathname
, 0, sizeof(pathname
));
5963 ret
= snprintf(pathname
, sizeof(pathname
),
5964 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5965 reg
->uid
, reg
->bits_per_long
);
5967 PERROR("snprintf snapshot path");
5971 /* Add the UST default trace dir to path. */
5972 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5973 reg_chan
, node
.node
) {
5974 ret
= consumer_snapshot_channel(socket
, reg_chan
->consumer_key
,
5975 output
, 0, usess
->uid
, usess
->gid
, pathname
, wait
,
5976 nb_packets_per_stream
);
5981 ret
= consumer_snapshot_channel(socket
,
5982 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5983 usess
->uid
, usess
->gid
, pathname
, wait
, 0);
5990 case LTTNG_BUFFER_PER_PID
:
5992 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5993 struct consumer_socket
*socket
;
5994 struct lttng_ht_iter chan_iter
;
5995 struct ust_app_channel
*ua_chan
;
5996 struct ust_app_session
*ua_sess
;
5997 struct ust_registry_session
*registry
;
5999 ua_sess
= lookup_session_by_app(usess
, app
);
6001 /* Session not associated with this app. */
6005 /* Get the right consumer socket for the application. */
6006 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
6013 /* Add the UST default trace dir to path. */
6014 memset(pathname
, 0, sizeof(pathname
));
6015 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
6018 PERROR("snprintf snapshot path");
6022 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6023 ua_chan
, node
.node
) {
6024 ret
= consumer_snapshot_channel(socket
, ua_chan
->key
, output
,
6025 0, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
6026 nb_packets_per_stream
);
6032 registry
= get_session_registry(ua_sess
);
6034 DBG("Application session is being torn down. Abort snapshot record.");
6038 ret
= consumer_snapshot_channel(socket
, registry
->metadata_key
, output
,
6039 1, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
, 0);
6057 * Return the size taken by one more packet per stream.
6059 uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session
*usess
,
6060 uint64_t cur_nr_packets
)
6062 uint64_t tot_size
= 0;
6063 struct ust_app
*app
;
6064 struct lttng_ht_iter iter
;
6068 switch (usess
->buffer_type
) {
6069 case LTTNG_BUFFER_PER_UID
:
6071 struct buffer_reg_uid
*reg
;
6073 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
6074 struct buffer_reg_channel
*reg_chan
;
6077 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
6078 reg_chan
, node
.node
) {
6079 if (cur_nr_packets
>= reg_chan
->num_subbuf
) {
6081 * Don't take channel into account if we
6082 * already grab all its packets.
6086 tot_size
+= reg_chan
->subbuf_size
* reg_chan
->stream_count
;
6092 case LTTNG_BUFFER_PER_PID
:
6095 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6096 struct ust_app_channel
*ua_chan
;
6097 struct ust_app_session
*ua_sess
;
6098 struct lttng_ht_iter chan_iter
;
6100 ua_sess
= lookup_session_by_app(usess
, app
);
6102 /* Session not associated with this app. */
6106 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
6107 ua_chan
, node
.node
) {
6108 if (cur_nr_packets
>= ua_chan
->attr
.num_subbuf
) {
6110 * Don't take channel into account if we
6111 * already grab all its packets.
6115 tot_size
+= ua_chan
->attr
.subbuf_size
* ua_chan
->streams
.count
;
6129 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id
,
6130 struct cds_list_head
*buffer_reg_uid_list
,
6131 struct consumer_output
*consumer
, uint64_t uchan_id
,
6132 int overwrite
, uint64_t *discarded
, uint64_t *lost
)
6135 uint64_t consumer_chan_key
;
6140 ret
= buffer_reg_uid_consumer_channel_key(
6141 buffer_reg_uid_list
, ust_session_id
,
6142 uchan_id
, &consumer_chan_key
);
6150 ret
= consumer_get_lost_packets(ust_session_id
,
6151 consumer_chan_key
, consumer
, lost
);
6153 ret
= consumer_get_discarded_events(ust_session_id
,
6154 consumer_chan_key
, consumer
, discarded
);
6161 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session
*usess
,
6162 struct ltt_ust_channel
*uchan
,
6163 struct consumer_output
*consumer
, int overwrite
,
6164 uint64_t *discarded
, uint64_t *lost
)
6167 struct lttng_ht_iter iter
;
6168 struct lttng_ht_node_str
*ua_chan_node
;
6169 struct ust_app
*app
;
6170 struct ust_app_session
*ua_sess
;
6171 struct ust_app_channel
*ua_chan
;
6178 * Iterate over every registered applications. Sum counters for
6179 * all applications containing requested session and channel.
6181 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6182 struct lttng_ht_iter uiter
;
6184 ua_sess
= lookup_session_by_app(usess
, app
);
6185 if (ua_sess
== NULL
) {
6190 lttng_ht_lookup(ua_sess
->channels
, (void *) uchan
->name
, &uiter
);
6191 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
6192 /* If the session is found for the app, the channel must be there */
6193 assert(ua_chan_node
);
6195 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
6200 ret
= consumer_get_lost_packets(usess
->id
, ua_chan
->key
,
6207 uint64_t _discarded
;
6209 ret
= consumer_get_discarded_events(usess
->id
,
6210 ua_chan
->key
, consumer
, &_discarded
);
6214 (*discarded
) += _discarded
;
6223 int ust_app_regenerate_statedump(struct ltt_ust_session
*usess
,
6224 struct ust_app
*app
)
6227 struct ust_app_session
*ua_sess
;
6229 DBG("Regenerating the metadata for ust app pid %d", app
->pid
);
6233 ua_sess
= lookup_session_by_app(usess
, app
);
6234 if (ua_sess
== NULL
) {
6235 /* The session is in teardown process. Ignore and continue. */
6239 pthread_mutex_lock(&ua_sess
->lock
);
6241 if (ua_sess
->deleted
) {
6245 pthread_mutex_lock(&app
->sock_lock
);
6246 ret
= ustctl_regenerate_statedump(app
->sock
, ua_sess
->handle
);
6247 pthread_mutex_unlock(&app
->sock_lock
);
6250 pthread_mutex_unlock(&ua_sess
->lock
);
6254 health_code_update();
6259 * Regenerate the statedump for each app in the session.
6261 int ust_app_regenerate_statedump_all(struct ltt_ust_session
*usess
)
6264 struct lttng_ht_iter iter
;
6265 struct ust_app
*app
;
6267 DBG("Regenerating the metadata for all UST apps");
6271 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
6272 if (!app
->compatible
) {
6276 ret
= ust_app_regenerate_statedump(usess
, app
);
6278 /* Continue to the next app even on error */