2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/types.h>
29 #include <urcu/compiler.h>
30 #include <lttng/ust-error.h>
33 #include <common/common.h>
34 #include <common/sessiond-comm/sessiond-comm.h>
36 #include "buffer-registry.h"
38 #include "health-sessiond.h"
40 #include "ust-consumer.h"
44 /* Next available channel key. Access under next_channel_key_lock. */
45 static uint64_t _next_channel_key
;
46 static pthread_mutex_t next_channel_key_lock
= PTHREAD_MUTEX_INITIALIZER
;
48 /* Next available session ID. Access under next_session_id_lock. */
49 static uint64_t _next_session_id
;
50 static pthread_mutex_t next_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
53 * Return the incremented value of next_channel_key.
55 static uint64_t get_next_channel_key(void)
59 pthread_mutex_lock(&next_channel_key_lock
);
60 ret
= ++_next_channel_key
;
61 pthread_mutex_unlock(&next_channel_key_lock
);
66 * Return the atomically incremented value of next_session_id.
68 static uint64_t get_next_session_id(void)
72 pthread_mutex_lock(&next_session_id_lock
);
73 ret
= ++_next_session_id
;
74 pthread_mutex_unlock(&next_session_id_lock
);
78 static void copy_channel_attr_to_ustctl(
79 struct ustctl_consumer_channel_attr
*attr
,
80 struct lttng_ust_channel_attr
*uattr
)
82 /* Copy event attributes since the layout is different. */
83 attr
->subbuf_size
= uattr
->subbuf_size
;
84 attr
->num_subbuf
= uattr
->num_subbuf
;
85 attr
->overwrite
= uattr
->overwrite
;
86 attr
->switch_timer_interval
= uattr
->switch_timer_interval
;
87 attr
->read_timer_interval
= uattr
->read_timer_interval
;
88 attr
->output
= uattr
->output
;
92 * Match function for the hash table lookup.
94 * It matches an ust app event based on three attributes which are the event
95 * name, the filter bytecode and the loglevel.
97 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
99 struct ust_app_event
*event
;
100 const struct ust_app_ht_key
*key
;
105 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
108 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
111 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
115 /* Event loglevel. */
116 if (event
->attr
.loglevel
!= key
->loglevel
) {
117 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
118 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
120 * Match is accepted. This is because on event creation, the
121 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
122 * -1 are accepted for this loglevel type since 0 is the one set by
123 * the API when receiving an enable event.
130 /* One of the filters is NULL, fail. */
131 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
135 if (key
->filter
&& event
->filter
) {
136 /* Both filters exists, check length followed by the bytecode. */
137 if (event
->filter
->len
!= key
->filter
->len
||
138 memcmp(event
->filter
->data
, key
->filter
->data
,
139 event
->filter
->len
) != 0) {
144 /* One of the exclusions is NULL, fail. */
145 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
149 if (key
->exclusion
&& event
->exclusion
) {
150 /* Both exclusions exists, check count followed by the names. */
151 if (event
->exclusion
->count
!= key
->exclusion
->count
||
152 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
153 event
->exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) != 0) {
167 * Unique add of an ust app event in the given ht. This uses the custom
168 * ht_match_ust_app_event match function and the event name as hash.
170 static void add_unique_ust_app_event(struct ust_app_channel
*ua_chan
,
171 struct ust_app_event
*event
)
173 struct cds_lfht_node
*node_ptr
;
174 struct ust_app_ht_key key
;
178 assert(ua_chan
->events
);
181 ht
= ua_chan
->events
;
182 key
.name
= event
->attr
.name
;
183 key
.filter
= event
->filter
;
184 key
.loglevel
= event
->attr
.loglevel
;
185 key
.exclusion
= event
->exclusion
;
187 node_ptr
= cds_lfht_add_unique(ht
->ht
,
188 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
189 ht_match_ust_app_event
, &key
, &event
->node
.node
);
190 assert(node_ptr
== &event
->node
.node
);
194 * Close the notify socket from the given RCU head object. This MUST be called
195 * through a call_rcu().
197 static void close_notify_sock_rcu(struct rcu_head
*head
)
200 struct ust_app_notify_sock_obj
*obj
=
201 caa_container_of(head
, struct ust_app_notify_sock_obj
, head
);
203 /* Must have a valid fd here. */
204 assert(obj
->fd
>= 0);
206 ret
= close(obj
->fd
);
208 ERR("close notify sock %d RCU", obj
->fd
);
210 lttng_fd_put(LTTNG_FD_APPS
, 1);
216 * Return the session registry according to the buffer type of the given
219 * A registry per UID object MUST exists before calling this function or else
220 * it assert() if not found. RCU read side lock must be acquired.
222 static struct ust_registry_session
*get_session_registry(
223 struct ust_app_session
*ua_sess
)
225 struct ust_registry_session
*registry
= NULL
;
229 switch (ua_sess
->buffer_type
) {
230 case LTTNG_BUFFER_PER_PID
:
232 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
236 registry
= reg_pid
->registry
->reg
.ust
;
239 case LTTNG_BUFFER_PER_UID
:
241 struct buffer_reg_uid
*reg_uid
= buffer_reg_uid_find(
242 ua_sess
->tracing_id
, ua_sess
->bits_per_long
, ua_sess
->uid
);
246 registry
= reg_uid
->registry
->reg
.ust
;
258 * Delete ust context safely. RCU read lock must be held before calling
262 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
269 ret
= ustctl_release_object(sock
, ua_ctx
->obj
);
270 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
271 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
272 sock
, ua_ctx
->obj
->handle
, ret
);
280 * Delete ust app event safely. RCU read lock must be held before calling
284 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
290 free(ua_event
->filter
);
291 if (ua_event
->exclusion
!= NULL
)
292 free(ua_event
->exclusion
);
293 if (ua_event
->obj
!= NULL
) {
294 ret
= ustctl_release_object(sock
, ua_event
->obj
);
295 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
296 ERR("UST app sock %d release event obj failed with ret %d",
305 * Release ust data object of the given stream.
307 * Return 0 on success or else a negative value.
309 static int release_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
316 ret
= ustctl_release_object(sock
, stream
->obj
);
317 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
318 ERR("UST app sock %d release stream obj failed with ret %d",
321 lttng_fd_put(LTTNG_FD_APPS
, 2);
329 * Delete ust app stream safely. RCU read lock must be held before calling
333 void delete_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
337 (void) release_ust_app_stream(sock
, stream
);
342 * We need to execute ht_destroy outside of RCU read-side critical
343 * section and outside of call_rcu thread, so we postpone its execution
344 * using ht_cleanup_push. It is simpler than to change the semantic of
345 * the many callers of delete_ust_app_session().
348 void delete_ust_app_channel_rcu(struct rcu_head
*head
)
350 struct ust_app_channel
*ua_chan
=
351 caa_container_of(head
, struct ust_app_channel
, rcu_head
);
353 ht_cleanup_push(ua_chan
->ctx
);
354 ht_cleanup_push(ua_chan
->events
);
359 * Delete ust app channel safely. RCU read lock must be held before calling
363 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
,
367 struct lttng_ht_iter iter
;
368 struct ust_app_event
*ua_event
;
369 struct ust_app_ctx
*ua_ctx
;
370 struct ust_app_stream
*stream
, *stmp
;
371 struct ust_registry_session
*registry
;
375 DBG3("UST app deleting channel %s", ua_chan
->name
);
378 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
379 cds_list_del(&stream
->list
);
380 delete_ust_app_stream(sock
, stream
);
384 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
385 cds_list_del(&ua_ctx
->list
);
386 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
388 delete_ust_app_ctx(sock
, ua_ctx
);
392 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
394 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
396 delete_ust_app_event(sock
, ua_event
);
399 if (ua_chan
->session
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
400 /* Wipe and free registry from session registry. */
401 registry
= get_session_registry(ua_chan
->session
);
403 ust_registry_channel_del_free(registry
, ua_chan
->key
);
407 if (ua_chan
->obj
!= NULL
) {
408 /* Remove channel from application UST object descriptor. */
409 iter
.iter
.node
= &ua_chan
->ust_objd_node
.node
;
410 ret
= lttng_ht_del(app
->ust_objd
, &iter
);
412 ret
= ustctl_release_object(sock
, ua_chan
->obj
);
413 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
414 ERR("UST app sock %d release channel obj failed with ret %d",
417 lttng_fd_put(LTTNG_FD_APPS
, 1);
420 call_rcu(&ua_chan
->rcu_head
, delete_ust_app_channel_rcu
);
424 * Push metadata to consumer socket.
426 * The socket lock MUST be acquired.
427 * The ust app session lock MUST be acquired.
429 * On success, return the len of metadata pushed or else a negative value.
431 ssize_t
ust_app_push_metadata(struct ust_registry_session
*registry
,
432 struct consumer_socket
*socket
, int send_zero_data
)
435 char *metadata_str
= NULL
;
443 * On a push metadata error either the consumer is dead or the metadata
444 * channel has been destroyed because its endpoint might have died (e.g:
445 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
446 * metadata again which is not valid anymore on the consumer side.
448 * The ust app session mutex locked allows us to make this check without
451 if (registry
->metadata_closed
) {
455 pthread_mutex_lock(®istry
->lock
);
457 offset
= registry
->metadata_len_sent
;
458 len
= registry
->metadata_len
- registry
->metadata_len_sent
;
460 DBG3("No metadata to push for metadata key %" PRIu64
,
461 registry
->metadata_key
);
463 if (send_zero_data
) {
464 DBG("No metadata to push");
470 /* Allocate only what we have to send. */
471 metadata_str
= zmalloc(len
);
473 PERROR("zmalloc ust app metadata string");
477 /* Copy what we haven't send out. */
478 memcpy(metadata_str
, registry
->metadata
+ offset
, len
);
479 registry
->metadata_len_sent
+= len
;
482 pthread_mutex_unlock(®istry
->lock
);
483 ret
= consumer_push_metadata(socket
, registry
->metadata_key
,
484 metadata_str
, len
, offset
);
487 * There is an acceptable race here between the registry metadata key
488 * assignment and the creation on the consumer. The session daemon can
489 * concurrently push metadata for this registry while being created on
490 * the consumer since the metadata key of the registry is assigned
491 * *before* it is setup to avoid the consumer to ask for metadata that
492 * could possibly be not found in the session daemon.
494 * The metadata will get pushed either by the session being stopped or
495 * the consumer requesting metadata if that race is triggered.
497 if (ret
== -LTTCOMM_CONSUMERD_CHANNEL_FAIL
) {
501 /* Update back the actual metadata len sent since it failed here. */
502 pthread_mutex_lock(®istry
->lock
);
503 registry
->metadata_len_sent
-= len
;
504 pthread_mutex_unlock(®istry
->lock
);
514 pthread_mutex_unlock(®istry
->lock
);
521 * For a given application and session, push metadata to consumer. The session
522 * lock MUST be acquired here before calling this.
523 * Either sock or consumer is required : if sock is NULL, the default
524 * socket to send the metadata is retrieved from consumer, if sock
525 * is not NULL we use it to send the metadata.
527 * Return 0 on success else a negative error.
529 static int push_metadata(struct ust_registry_session
*registry
,
530 struct consumer_output
*consumer
)
534 struct consumer_socket
*socket
;
542 * Means that no metadata was assigned to the session. This can happens if
543 * no start has been done previously.
545 if (!registry
->metadata_key
) {
550 /* Get consumer socket to use to push the metadata.*/
551 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
555 goto error_rcu_unlock
;
559 * TODO: Currently, we hold the socket lock around sampling of the next
560 * metadata segment to ensure we send metadata over the consumer socket in
561 * the correct order. This makes the registry lock nest inside the socket
564 * Please note that this is a temporary measure: we should move this lock
565 * back into ust_consumer_push_metadata() when the consumer gets the
566 * ability to reorder the metadata it receives.
568 pthread_mutex_lock(socket
->lock
);
569 ret
= ust_app_push_metadata(registry
, socket
, 0);
570 pthread_mutex_unlock(socket
->lock
);
573 goto error_rcu_unlock
;
581 * On error, flag the registry that the metadata is closed. We were unable
582 * to push anything and this means that either the consumer is not
583 * responding or the metadata cache has been destroyed on the consumer.
585 registry
->metadata_closed
= 1;
592 * Send to the consumer a close metadata command for the given session. Once
593 * done, the metadata channel is deleted and the session metadata pointer is
594 * nullified. The session lock MUST be acquired here unless the application is
595 * in the destroy path.
597 * Return 0 on success else a negative value.
599 static int close_metadata(struct ust_registry_session
*registry
,
600 struct consumer_output
*consumer
)
603 struct consumer_socket
*socket
;
610 if (!registry
->metadata_key
|| registry
->metadata_closed
) {
615 /* Get consumer socket to use to push the metadata.*/
616 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
623 ret
= consumer_close_metadata(socket
, registry
->metadata_key
);
630 * Metadata closed. Even on error this means that the consumer is not
631 * responding or not found so either way a second close should NOT be emit
634 registry
->metadata_closed
= 1;
641 * We need to execute ht_destroy outside of RCU read-side critical
642 * section and outside of call_rcu thread, so we postpone its execution
643 * using ht_cleanup_push. It is simpler than to change the semantic of
644 * the many callers of delete_ust_app_session().
647 void delete_ust_app_session_rcu(struct rcu_head
*head
)
649 struct ust_app_session
*ua_sess
=
650 caa_container_of(head
, struct ust_app_session
, rcu_head
);
652 ht_cleanup_push(ua_sess
->channels
);
657 * Delete ust app session safely. RCU read lock must be held before calling
661 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
665 struct lttng_ht_iter iter
;
666 struct ust_app_channel
*ua_chan
;
667 struct ust_registry_session
*registry
;
671 pthread_mutex_lock(&ua_sess
->lock
);
673 registry
= get_session_registry(ua_sess
);
674 if (registry
&& !registry
->metadata_closed
) {
675 /* Push metadata for application before freeing the application. */
676 (void) push_metadata(registry
, ua_sess
->consumer
);
679 * Don't ask to close metadata for global per UID buffers. Close
680 * metadata only on destroy trace session in this case. Also, the
681 * previous push metadata could have flag the metadata registry to
682 * close so don't send a close command if closed.
684 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
&&
685 !registry
->metadata_closed
) {
686 /* And ask to close it for this session registry. */
687 (void) close_metadata(registry
, ua_sess
->consumer
);
691 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
693 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
695 delete_ust_app_channel(sock
, ua_chan
, app
);
698 /* In case of per PID, the registry is kept in the session. */
699 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
700 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
702 buffer_reg_pid_remove(reg_pid
);
703 buffer_reg_pid_destroy(reg_pid
);
707 if (ua_sess
->handle
!= -1) {
708 ret
= ustctl_release_handle(sock
, ua_sess
->handle
);
709 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
710 ERR("UST app sock %d release session handle failed with ret %d",
714 pthread_mutex_unlock(&ua_sess
->lock
);
716 call_rcu(&ua_sess
->rcu_head
, delete_ust_app_session_rcu
);
720 * Delete a traceable application structure from the global list. Never call
721 * this function outside of a call_rcu call.
723 * RCU read side lock should _NOT_ be held when calling this function.
726 void delete_ust_app(struct ust_app
*app
)
729 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
731 /* Delete ust app sessions info */
736 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
738 /* Free every object in the session and the session. */
740 delete_ust_app_session(sock
, ua_sess
, app
);
744 ht_cleanup_push(app
->sessions
);
745 ht_cleanup_push(app
->ust_objd
);
748 * Wait until we have deleted the application from the sock hash table
749 * before closing this socket, otherwise an application could re-use the
750 * socket ID and race with the teardown, using the same hash table entry.
752 * It's OK to leave the close in call_rcu. We want it to stay unique for
753 * all RCU readers that could run concurrently with unregister app,
754 * therefore we _need_ to only close that socket after a grace period. So
755 * it should stay in this RCU callback.
757 * This close() is a very important step of the synchronization model so
758 * every modification to this function must be carefully reviewed.
764 lttng_fd_put(LTTNG_FD_APPS
, 1);
766 DBG2("UST app pid %d deleted", app
->pid
);
771 * URCU intermediate call to delete an UST app.
774 void delete_ust_app_rcu(struct rcu_head
*head
)
776 struct lttng_ht_node_ulong
*node
=
777 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
778 struct ust_app
*app
=
779 caa_container_of(node
, struct ust_app
, pid_n
);
781 DBG3("Call RCU deleting app PID %d", app
->pid
);
786 * Delete the session from the application ht and delete the data structure by
787 * freeing every object inside and releasing them.
789 static void destroy_app_session(struct ust_app
*app
,
790 struct ust_app_session
*ua_sess
)
793 struct lttng_ht_iter iter
;
798 iter
.iter
.node
= &ua_sess
->node
.node
;
799 ret
= lttng_ht_del(app
->sessions
, &iter
);
801 /* Already scheduled for teardown. */
805 /* Once deleted, free the data structure. */
806 delete_ust_app_session(app
->sock
, ua_sess
, app
);
813 * Alloc new UST app session.
816 struct ust_app_session
*alloc_ust_app_session(struct ust_app
*app
)
818 struct ust_app_session
*ua_sess
;
820 /* Init most of the default value by allocating and zeroing */
821 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
822 if (ua_sess
== NULL
) {
827 ua_sess
->handle
= -1;
828 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
829 ua_sess
->metadata_attr
.type
= LTTNG_UST_CHAN_METADATA
;
830 pthread_mutex_init(&ua_sess
->lock
, NULL
);
839 * Alloc new UST app channel.
842 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
843 struct ust_app_session
*ua_sess
,
844 struct lttng_ust_channel_attr
*attr
)
846 struct ust_app_channel
*ua_chan
;
848 /* Init most of the default value by allocating and zeroing */
849 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
850 if (ua_chan
== NULL
) {
855 /* Setup channel name */
856 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
857 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
859 ua_chan
->enabled
= 1;
860 ua_chan
->handle
= -1;
861 ua_chan
->session
= ua_sess
;
862 ua_chan
->key
= get_next_channel_key();
863 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
864 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
865 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
867 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
868 CDS_INIT_LIST_HEAD(&ua_chan
->ctx_list
);
870 /* Copy attributes */
872 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
873 ua_chan
->attr
.subbuf_size
= attr
->subbuf_size
;
874 ua_chan
->attr
.num_subbuf
= attr
->num_subbuf
;
875 ua_chan
->attr
.overwrite
= attr
->overwrite
;
876 ua_chan
->attr
.switch_timer_interval
= attr
->switch_timer_interval
;
877 ua_chan
->attr
.read_timer_interval
= attr
->read_timer_interval
;
878 ua_chan
->attr
.output
= attr
->output
;
880 /* By default, the channel is a per cpu channel. */
881 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
883 DBG3("UST app channel %s allocated", ua_chan
->name
);
892 * Allocate and initialize a UST app stream.
894 * Return newly allocated stream pointer or NULL on error.
896 struct ust_app_stream
*ust_app_alloc_stream(void)
898 struct ust_app_stream
*stream
= NULL
;
900 stream
= zmalloc(sizeof(*stream
));
901 if (stream
== NULL
) {
902 PERROR("zmalloc ust app stream");
906 /* Zero could be a valid value for a handle so flag it to -1. */
914 * Alloc new UST app event.
917 struct ust_app_event
*alloc_ust_app_event(char *name
,
918 struct lttng_ust_event
*attr
)
920 struct ust_app_event
*ua_event
;
922 /* Init most of the default value by allocating and zeroing */
923 ua_event
= zmalloc(sizeof(struct ust_app_event
));
924 if (ua_event
== NULL
) {
929 ua_event
->enabled
= 1;
930 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
931 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
932 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
934 /* Copy attributes */
936 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
939 DBG3("UST app event %s allocated", ua_event
->name
);
948 * Alloc new UST app context.
951 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
953 struct ust_app_ctx
*ua_ctx
;
955 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
956 if (ua_ctx
== NULL
) {
960 CDS_INIT_LIST_HEAD(&ua_ctx
->list
);
963 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
966 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
973 * Allocate a filter and copy the given original filter.
975 * Return allocated filter or NULL on error.
977 static struct lttng_ust_filter_bytecode
*alloc_copy_ust_app_filter(
978 struct lttng_ust_filter_bytecode
*orig_f
)
980 struct lttng_ust_filter_bytecode
*filter
= NULL
;
982 /* Copy filter bytecode */
983 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
985 PERROR("zmalloc alloc ust app filter");
989 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
996 * Find an ust_app using the sock and return it. RCU read side lock must be
997 * held before calling this helper function.
999 struct ust_app
*ust_app_find_by_sock(int sock
)
1001 struct lttng_ht_node_ulong
*node
;
1002 struct lttng_ht_iter iter
;
1004 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1005 node
= lttng_ht_iter_get_node_ulong(&iter
);
1007 DBG2("UST app find by sock %d not found", sock
);
1011 return caa_container_of(node
, struct ust_app
, sock_n
);
1018 * Find an ust_app using the notify sock and return it. RCU read side lock must
1019 * be held before calling this helper function.
1021 static struct ust_app
*find_app_by_notify_sock(int sock
)
1023 struct lttng_ht_node_ulong
*node
;
1024 struct lttng_ht_iter iter
;
1026 lttng_ht_lookup(ust_app_ht_by_notify_sock
, (void *)((unsigned long) sock
),
1028 node
= lttng_ht_iter_get_node_ulong(&iter
);
1030 DBG2("UST app find by notify sock %d not found", sock
);
1034 return caa_container_of(node
, struct ust_app
, notify_sock_n
);
1041 * Lookup for an ust app event based on event name, filter bytecode and the
1044 * Return an ust_app_event object or NULL on error.
1046 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
1047 char *name
, struct lttng_ust_filter_bytecode
*filter
, int loglevel
,
1048 const struct lttng_event_exclusion
*exclusion
)
1050 struct lttng_ht_iter iter
;
1051 struct lttng_ht_node_str
*node
;
1052 struct ust_app_event
*event
= NULL
;
1053 struct ust_app_ht_key key
;
1058 /* Setup key for event lookup. */
1060 key
.filter
= filter
;
1061 key
.loglevel
= loglevel
;
1062 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1063 key
.exclusion
= (struct lttng_ust_event_exclusion
*)exclusion
;
1065 /* Lookup using the event name as hash and a custom match fct. */
1066 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
1067 ht_match_ust_app_event
, &key
, &iter
.iter
);
1068 node
= lttng_ht_iter_get_node_str(&iter
);
1073 event
= caa_container_of(node
, struct ust_app_event
, node
);
1080 * Create the channel context on the tracer.
1082 * Called with UST app session lock held.
1085 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
1086 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
1090 health_code_update();
1092 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
1093 ua_chan
->obj
, &ua_ctx
->obj
);
1095 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1096 ERR("UST app create channel context failed for app (pid: %d) "
1097 "with ret %d", app
->pid
, ret
);
1100 * This is normal behavior, an application can die during the
1101 * creation process. Don't report an error so the execution can
1102 * continue normally.
1105 DBG3("UST app disable event failed. Application is dead.");
1110 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
1112 DBG2("UST app context handle %d created successfully for channel %s",
1113 ua_ctx
->handle
, ua_chan
->name
);
1116 health_code_update();
1121 * Set the filter on the tracer.
1124 int set_ust_event_filter(struct ust_app_event
*ua_event
,
1125 struct ust_app
*app
)
1129 health_code_update();
1131 if (!ua_event
->filter
) {
1136 ret
= ustctl_set_filter(app
->sock
, ua_event
->filter
,
1139 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1140 ERR("UST app event %s filter failed for app (pid: %d) "
1141 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1144 * This is normal behavior, an application can die during the
1145 * creation process. Don't report an error so the execution can
1146 * continue normally.
1149 DBG3("UST app filter event failed. Application is dead.");
1154 DBG2("UST filter set successfully for event %s", ua_event
->name
);
1157 health_code_update();
1162 * Set event exclusions on the tracer.
1165 int set_ust_event_exclusion(struct ust_app_event
*ua_event
,
1166 struct ust_app
*app
)
1170 health_code_update();
1172 if (!ua_event
->exclusion
|| !ua_event
->exclusion
->count
) {
1177 ret
= ustctl_set_exclusion(app
->sock
, ua_event
->exclusion
,
1180 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1181 ERR("UST app event %s exclusions failed for app (pid: %d) "
1182 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1185 * This is normal behavior, an application can die during the
1186 * creation process. Don't report an error so the execution can
1187 * continue normally.
1190 DBG3("UST app event exclusion failed. Application is dead.");
1195 DBG2("UST exclusion set successfully for event %s", ua_event
->name
);
1198 health_code_update();
1203 * Disable the specified event on to UST tracer for the UST session.
1205 static int disable_ust_event(struct ust_app
*app
,
1206 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1210 health_code_update();
1212 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
1214 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1215 ERR("UST app event %s disable failed for app (pid: %d) "
1216 "and session handle %d with ret %d",
1217 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1220 * This is normal behavior, an application can die during the
1221 * creation process. Don't report an error so the execution can
1222 * continue normally.
1225 DBG3("UST app disable event failed. Application is dead.");
1230 DBG2("UST app event %s disabled successfully for app (pid: %d)",
1231 ua_event
->attr
.name
, app
->pid
);
1234 health_code_update();
1239 * Disable the specified channel on to UST tracer for the UST session.
1241 static int disable_ust_channel(struct ust_app
*app
,
1242 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1246 health_code_update();
1248 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
1250 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1251 ERR("UST app channel %s disable failed for app (pid: %d) "
1252 "and session handle %d with ret %d",
1253 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1256 * This is normal behavior, an application can die during the
1257 * creation process. Don't report an error so the execution can
1258 * continue normally.
1261 DBG3("UST app disable channel failed. Application is dead.");
1266 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
1267 ua_chan
->name
, app
->pid
);
1270 health_code_update();
1275 * Enable the specified channel on to UST tracer for the UST session.
1277 static int enable_ust_channel(struct ust_app
*app
,
1278 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1282 health_code_update();
1284 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
1286 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1287 ERR("UST app channel %s enable failed for app (pid: %d) "
1288 "and session handle %d with ret %d",
1289 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1292 * This is normal behavior, an application can die during the
1293 * creation process. Don't report an error so the execution can
1294 * continue normally.
1297 DBG3("UST app enable channel failed. Application is dead.");
1302 ua_chan
->enabled
= 1;
1304 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
1305 ua_chan
->name
, app
->pid
);
1308 health_code_update();
1313 * Enable the specified event on to UST tracer for the UST session.
1315 static int enable_ust_event(struct ust_app
*app
,
1316 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1320 health_code_update();
1322 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
1324 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1325 ERR("UST app event %s enable failed for app (pid: %d) "
1326 "and session handle %d with ret %d",
1327 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1330 * This is normal behavior, an application can die during the
1331 * creation process. Don't report an error so the execution can
1332 * continue normally.
1335 DBG3("UST app enable event failed. Application is dead.");
1340 DBG2("UST app event %s enabled successfully for app (pid: %d)",
1341 ua_event
->attr
.name
, app
->pid
);
1344 health_code_update();
1349 * Send channel and stream buffer to application.
1351 * Return 0 on success. On error, a negative value is returned.
1353 static int send_channel_pid_to_ust(struct ust_app
*app
,
1354 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1357 struct ust_app_stream
*stream
, *stmp
;
1363 health_code_update();
1365 DBG("UST app sending channel %s to UST app sock %d", ua_chan
->name
,
1368 /* Send channel to the application. */
1369 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
1374 health_code_update();
1376 /* Send all streams to application. */
1377 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
1378 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, stream
);
1382 /* We don't need the stream anymore once sent to the tracer. */
1383 cds_list_del(&stream
->list
);
1384 delete_ust_app_stream(-1, stream
);
1386 /* Flag the channel that it is sent to the application. */
1387 ua_chan
->is_sent
= 1;
1390 health_code_update();
1395 * Create the specified event onto the UST tracer for a UST session.
1397 * Should be called with session mutex held.
1400 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
1401 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
1405 health_code_update();
1407 /* Create UST event on tracer */
1408 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
1411 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1412 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1413 ua_event
->attr
.name
, app
->pid
, ret
);
1416 * This is normal behavior, an application can die during the
1417 * creation process. Don't report an error so the execution can
1418 * continue normally.
1421 DBG3("UST app create event failed. Application is dead.");
1426 ua_event
->handle
= ua_event
->obj
->handle
;
1428 DBG2("UST app event %s created successfully for pid:%d",
1429 ua_event
->attr
.name
, app
->pid
);
1431 health_code_update();
1433 /* Set filter if one is present. */
1434 if (ua_event
->filter
) {
1435 ret
= set_ust_event_filter(ua_event
, app
);
1441 /* Set exclusions for the event */
1442 if (ua_event
->exclusion
) {
1443 ret
= set_ust_event_exclusion(ua_event
, app
);
1449 /* If event not enabled, disable it on the tracer */
1450 if (ua_event
->enabled
) {
1452 * We now need to explicitly enable the event, since it
1453 * is now disabled at creation.
1455 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1458 * If we hit an EPERM, something is wrong with our enable call. If
1459 * we get an EEXIST, there is a problem on the tracer side since we
1463 case -LTTNG_UST_ERR_PERM
:
1464 /* Code flow problem */
1466 case -LTTNG_UST_ERR_EXIST
:
1467 /* It's OK for our use case. */
1478 health_code_update();
1483 * Copy data between an UST app event and a LTT event.
1485 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1486 struct ltt_ust_event
*uevent
)
1488 size_t exclusion_alloc_size
;
1490 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1491 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1493 ua_event
->enabled
= uevent
->enabled
;
1495 /* Copy event attributes */
1496 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1498 /* Copy filter bytecode */
1499 if (uevent
->filter
) {
1500 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
1501 /* Filter might be NULL here in case of ENONEM. */
1504 /* Copy exclusion data */
1505 if (uevent
->exclusion
) {
1506 exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1507 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1508 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1509 if (ua_event
->exclusion
== NULL
) {
1512 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1513 exclusion_alloc_size
);
1519 * Copy data between an UST app channel and a LTT channel.
1521 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1522 struct ltt_ust_channel
*uchan
)
1524 struct lttng_ht_iter iter
;
1525 struct ltt_ust_event
*uevent
;
1526 struct ltt_ust_context
*uctx
;
1527 struct ust_app_event
*ua_event
;
1528 struct ust_app_ctx
*ua_ctx
;
1530 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1532 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1533 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1535 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1536 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1538 /* Copy event attributes since the layout is different. */
1539 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1540 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1541 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1542 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1543 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1544 ua_chan
->attr
.output
= uchan
->attr
.output
;
1546 * Note that the attribute channel type is not set since the channel on the
1547 * tracing registry side does not have this information.
1550 ua_chan
->enabled
= uchan
->enabled
;
1551 ua_chan
->tracing_channel_id
= uchan
->id
;
1553 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
1554 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
1555 if (ua_ctx
== NULL
) {
1558 lttng_ht_node_init_ulong(&ua_ctx
->node
,
1559 (unsigned long) ua_ctx
->ctx
.ctx
);
1560 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1561 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
1564 /* Copy all events from ltt ust channel to ust app channel */
1565 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
1566 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1567 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
1568 if (ua_event
== NULL
) {
1569 DBG2("UST event %s not found on shadow copy channel",
1571 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1572 if (ua_event
== NULL
) {
1575 shadow_copy_event(ua_event
, uevent
);
1576 add_unique_ust_app_event(ua_chan
, ua_event
);
1580 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1584 * Copy data between a UST app session and a regular LTT session.
1586 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1587 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1589 struct lttng_ht_node_str
*ua_chan_node
;
1590 struct lttng_ht_iter iter
;
1591 struct ltt_ust_channel
*uchan
;
1592 struct ust_app_channel
*ua_chan
;
1594 struct tm
*timeinfo
;
1598 /* Get date and time for unique app path */
1600 timeinfo
= localtime(&rawtime
);
1601 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1603 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1605 ua_sess
->tracing_id
= usess
->id
;
1606 ua_sess
->id
= get_next_session_id();
1607 ua_sess
->uid
= app
->uid
;
1608 ua_sess
->gid
= app
->gid
;
1609 ua_sess
->euid
= usess
->uid
;
1610 ua_sess
->egid
= usess
->gid
;
1611 ua_sess
->buffer_type
= usess
->buffer_type
;
1612 ua_sess
->bits_per_long
= app
->bits_per_long
;
1613 /* There is only one consumer object per session possible. */
1614 ua_sess
->consumer
= usess
->consumer
;
1615 ua_sess
->output_traces
= usess
->output_traces
;
1616 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1617 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1618 &usess
->metadata_attr
);
1620 switch (ua_sess
->buffer_type
) {
1621 case LTTNG_BUFFER_PER_PID
:
1622 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1623 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1626 case LTTNG_BUFFER_PER_UID
:
1627 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1628 DEFAULT_UST_TRACE_UID_PATH
, ua_sess
->uid
, app
->bits_per_long
);
1635 PERROR("asprintf UST shadow copy session");
1640 /* Iterate over all channels in global domain. */
1641 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1643 struct lttng_ht_iter uiter
;
1645 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1646 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1647 if (ua_chan_node
!= NULL
) {
1648 /* Session exist. Contiuing. */
1652 DBG2("Channel %s not found on shadow session copy, creating it",
1654 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
1655 if (ua_chan
== NULL
) {
1656 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1659 shadow_copy_channel(ua_chan
, uchan
);
1661 * The concept of metadata channel does not exist on the tracing
1662 * registry side of the session daemon so this can only be a per CPU
1663 * channel and not metadata.
1665 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1667 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1675 * Lookup sesison wrapper.
1678 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1679 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1681 /* Get right UST app session from app */
1682 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
1686 * Return ust app session from the app session hashtable using the UST session
1689 static struct ust_app_session
*lookup_session_by_app(
1690 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1692 struct lttng_ht_iter iter
;
1693 struct lttng_ht_node_u64
*node
;
1695 __lookup_session_by_app(usess
, app
, &iter
);
1696 node
= lttng_ht_iter_get_node_u64(&iter
);
1701 return caa_container_of(node
, struct ust_app_session
, node
);
1708 * Setup buffer registry per PID for the given session and application. If none
1709 * is found, a new one is created, added to the global registry and
1710 * initialized. If regp is valid, it's set with the newly created object.
1712 * Return 0 on success or else a negative value.
1714 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
1715 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
1718 struct buffer_reg_pid
*reg_pid
;
1725 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
1728 * This is the create channel path meaning that if there is NO
1729 * registry available, we have to create one for this session.
1731 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
);
1739 /* Initialize registry. */
1740 ret
= ust_registry_session_init(®_pid
->registry
->reg
.ust
, app
,
1741 app
->bits_per_long
, app
->uint8_t_alignment
,
1742 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1743 app
->uint64_t_alignment
, app
->long_alignment
,
1744 app
->byte_order
, app
->version
.major
,
1745 app
->version
.minor
);
1748 * reg_pid->registry->reg.ust is NULL upon error, so we need to
1749 * destroy the buffer registry, because it is always expected
1750 * that if the buffer registry can be found, its ust registry is
1753 buffer_reg_pid_destroy(reg_pid
);
1757 buffer_reg_pid_add(reg_pid
);
1759 DBG3("UST app buffer registry per PID created successfully");
1771 * Setup buffer registry per UID for the given session and application. If none
1772 * is found, a new one is created, added to the global registry and
1773 * initialized. If regp is valid, it's set with the newly created object.
1775 * Return 0 on success or else a negative value.
1777 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
1778 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
1781 struct buffer_reg_uid
*reg_uid
;
1788 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
1791 * This is the create channel path meaning that if there is NO
1792 * registry available, we have to create one for this session.
1794 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
1795 LTTNG_DOMAIN_UST
, ®_uid
);
1803 /* Initialize registry. */
1804 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
1805 app
->bits_per_long
, app
->uint8_t_alignment
,
1806 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1807 app
->uint64_t_alignment
, app
->long_alignment
,
1808 app
->byte_order
, app
->version
.major
,
1809 app
->version
.minor
);
1812 * reg_uid->registry->reg.ust is NULL upon error, so we need to
1813 * destroy the buffer registry, because it is always expected
1814 * that if the buffer registry can be found, its ust registry is
1817 buffer_reg_uid_destroy(reg_uid
, NULL
);
1820 /* Add node to teardown list of the session. */
1821 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
1823 buffer_reg_uid_add(reg_uid
);
1825 DBG3("UST app buffer registry per UID created successfully");
1836 * Create a session on the tracer side for the given app.
1838 * On success, ua_sess_ptr is populated with the session pointer or else left
1839 * untouched. If the session was created, is_created is set to 1. On error,
1840 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1843 * Returns 0 on success or else a negative code which is either -ENOMEM or
1844 * -ENOTCONN which is the default code if the ustctl_create_session fails.
1846 static int create_ust_app_session(struct ltt_ust_session
*usess
,
1847 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
1850 int ret
, created
= 0;
1851 struct ust_app_session
*ua_sess
;
1855 assert(ua_sess_ptr
);
1857 health_code_update();
1859 ua_sess
= lookup_session_by_app(usess
, app
);
1860 if (ua_sess
== NULL
) {
1861 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
1862 app
->pid
, usess
->id
);
1863 ua_sess
= alloc_ust_app_session(app
);
1864 if (ua_sess
== NULL
) {
1865 /* Only malloc can failed so something is really wrong */
1869 shadow_copy_session(ua_sess
, usess
, app
);
1873 switch (usess
->buffer_type
) {
1874 case LTTNG_BUFFER_PER_PID
:
1875 /* Init local registry. */
1876 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
1881 case LTTNG_BUFFER_PER_UID
:
1882 /* Look for a global registry. If none exists, create one. */
1883 ret
= setup_buffer_reg_uid(usess
, app
, NULL
);
1894 health_code_update();
1896 if (ua_sess
->handle
== -1) {
1897 ret
= ustctl_create_session(app
->sock
);
1899 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1900 ERR("Creating session for app pid %d with ret %d",
1903 DBG("UST app creating session failed. Application is dead");
1905 * This is normal behavior, an application can die during the
1906 * creation process. Don't report an error so the execution can
1907 * continue normally. This will get flagged ENOTCONN and the
1908 * caller will handle it.
1912 delete_ust_app_session(-1, ua_sess
, app
);
1913 if (ret
!= -ENOMEM
) {
1915 * Tracer is probably gone or got an internal error so let's
1916 * behave like it will soon unregister or not usable.
1923 ua_sess
->handle
= ret
;
1925 /* Add ust app session to app's HT */
1926 lttng_ht_node_init_u64(&ua_sess
->node
,
1927 ua_sess
->tracing_id
);
1928 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
1930 DBG2("UST app session created successfully with handle %d", ret
);
1933 *ua_sess_ptr
= ua_sess
;
1935 *is_created
= created
;
1938 /* Everything went well. */
1942 health_code_update();
1947 * Match function for a hash table lookup of ust_app_ctx.
1949 * It matches an ust app context based on the context type and, in the case
1950 * of perf counters, their name.
1952 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
1954 struct ust_app_ctx
*ctx
;
1955 const struct lttng_ust_context
*key
;
1960 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
1964 if (ctx
->ctx
.ctx
!= key
->ctx
) {
1968 /* Check the name in the case of perf thread counters. */
1969 if (key
->ctx
== LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
) {
1970 if (strncmp(key
->u
.perf_counter
.name
,
1971 ctx
->ctx
.u
.perf_counter
.name
,
1972 sizeof(key
->u
.perf_counter
.name
))) {
1985 * Lookup for an ust app context from an lttng_ust_context.
1987 * Must be called while holding RCU read side lock.
1988 * Return an ust_app_ctx object or NULL on error.
1991 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
1992 struct lttng_ust_context
*uctx
)
1994 struct lttng_ht_iter iter
;
1995 struct lttng_ht_node_ulong
*node
;
1996 struct ust_app_ctx
*app_ctx
= NULL
;
2001 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2002 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
2003 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
2004 node
= lttng_ht_iter_get_node_ulong(&iter
);
2009 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
2016 * Create a context for the channel on the tracer.
2018 * Called with UST app session lock held and a RCU read side lock.
2021 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
2022 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
2023 struct ust_app
*app
)
2026 struct ust_app_ctx
*ua_ctx
;
2028 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2030 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2036 ua_ctx
= alloc_ust_app_ctx(uctx
);
2037 if (ua_ctx
== NULL
) {
2043 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2044 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2045 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2047 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2057 * Enable on the tracer side a ust app event for the session and channel.
2059 * Called with UST app session lock held.
2062 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2063 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2067 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2072 ua_event
->enabled
= 1;
2079 * Disable on the tracer side a ust app event for the session and channel.
2081 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2082 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2086 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2091 ua_event
->enabled
= 0;
2098 * Lookup ust app channel for session and disable it on the tracer side.
2101 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2102 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2106 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2111 ua_chan
->enabled
= 0;
2118 * Lookup ust app channel for session and enable it on the tracer side. This
2119 * MUST be called with a RCU read side lock acquired.
2121 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2122 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2125 struct lttng_ht_iter iter
;
2126 struct lttng_ht_node_str
*ua_chan_node
;
2127 struct ust_app_channel
*ua_chan
;
2129 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2130 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2131 if (ua_chan_node
== NULL
) {
2132 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2133 uchan
->name
, ua_sess
->tracing_id
);
2137 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2139 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2149 * Ask the consumer to create a channel and get it if successful.
2151 * Return 0 on success or else a negative value.
2153 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2154 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2155 int bitness
, struct ust_registry_session
*registry
)
2158 unsigned int nb_fd
= 0;
2159 struct consumer_socket
*socket
;
2167 health_code_update();
2169 /* Get the right consumer socket for the application. */
2170 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2176 health_code_update();
2178 /* Need one fd for the channel. */
2179 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2181 ERR("Exhausted number of available FD upon create channel");
2186 * Ask consumer to create channel. The consumer will return the number of
2187 * stream we have to expect.
2189 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2196 * Compute the number of fd needed before receiving them. It must be 2 per
2197 * stream (2 being the default value here).
2199 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2201 /* Reserve the amount of file descriptor we need. */
2202 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2204 ERR("Exhausted number of available FD upon create channel");
2205 goto error_fd_get_stream
;
2208 health_code_update();
2211 * Now get the channel from the consumer. This call wil populate the stream
2212 * list of that channel and set the ust objects.
2214 if (usess
->consumer
->enabled
) {
2215 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2225 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2226 error_fd_get_stream
:
2228 * Initiate a destroy channel on the consumer since we had an error
2229 * handling it on our side. The return value is of no importance since we
2230 * already have a ret value set by the previous error that we need to
2233 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2235 lttng_fd_put(LTTNG_FD_APPS
, 1);
2237 health_code_update();
2243 * Duplicate the ust data object of the ust app stream and save it in the
2244 * buffer registry stream.
2246 * Return 0 on success or else a negative value.
2248 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2249 struct ust_app_stream
*stream
)
2256 /* Reserve the amount of file descriptor we need. */
2257 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2259 ERR("Exhausted number of available FD upon duplicate stream");
2263 /* Duplicate object for stream once the original is in the registry. */
2264 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2265 reg_stream
->obj
.ust
);
2267 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2268 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2269 lttng_fd_put(LTTNG_FD_APPS
, 2);
2272 stream
->handle
= stream
->obj
->handle
;
2279 * Duplicate the ust data object of the ust app. channel and save it in the
2280 * buffer registry channel.
2282 * Return 0 on success or else a negative value.
2284 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2285 struct ust_app_channel
*ua_chan
)
2292 /* Need two fds for the channel. */
2293 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2295 ERR("Exhausted number of available FD upon duplicate channel");
2299 /* Duplicate object for stream once the original is in the registry. */
2300 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2302 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2303 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2306 ua_chan
->handle
= ua_chan
->obj
->handle
;
2311 lttng_fd_put(LTTNG_FD_APPS
, 1);
2317 * For a given channel buffer registry, setup all streams of the given ust
2318 * application channel.
2320 * Return 0 on success or else a negative value.
2322 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2323 struct ust_app_channel
*ua_chan
)
2326 struct ust_app_stream
*stream
, *stmp
;
2331 DBG2("UST app setup buffer registry stream");
2333 /* Send all streams to application. */
2334 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2335 struct buffer_reg_stream
*reg_stream
;
2337 ret
= buffer_reg_stream_create(®_stream
);
2343 * Keep original pointer and nullify it in the stream so the delete
2344 * stream call does not release the object.
2346 reg_stream
->obj
.ust
= stream
->obj
;
2348 buffer_reg_stream_add(reg_stream
, reg_chan
);
2350 /* We don't need the streams anymore. */
2351 cds_list_del(&stream
->list
);
2352 delete_ust_app_stream(-1, stream
);
2360 * Create a buffer registry channel for the given session registry and
2361 * application channel object. If regp pointer is valid, it's set with the
2362 * created object. Important, the created object is NOT added to the session
2363 * registry hash table.
2365 * Return 0 on success else a negative value.
2367 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2368 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2371 struct buffer_reg_channel
*reg_chan
= NULL
;
2376 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2378 /* Create buffer registry channel. */
2379 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2384 reg_chan
->consumer_key
= ua_chan
->key
;
2385 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2387 /* Create and add a channel registry to session. */
2388 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2389 ua_chan
->tracing_channel_id
);
2393 buffer_reg_channel_add(reg_sess
, reg_chan
);
2402 /* Safe because the registry channel object was not added to any HT. */
2403 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2409 * Setup buffer registry channel for the given session registry and application
2410 * channel object. If regp pointer is valid, it's set with the created object.
2412 * Return 0 on success else a negative value.
2414 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2415 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
)
2422 assert(ua_chan
->obj
);
2424 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2426 /* Setup all streams for the registry. */
2427 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
);
2432 reg_chan
->obj
.ust
= ua_chan
->obj
;
2433 ua_chan
->obj
= NULL
;
2438 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2439 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2444 * Send buffer registry channel to the application.
2446 * Return 0 on success else a negative value.
2448 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2449 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2450 struct ust_app_channel
*ua_chan
)
2453 struct buffer_reg_stream
*reg_stream
;
2460 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2462 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2467 /* Send channel to the application. */
2468 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2473 health_code_update();
2475 /* Send all streams to application. */
2476 pthread_mutex_lock(®_chan
->stream_list_lock
);
2477 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2478 struct ust_app_stream stream
;
2480 ret
= duplicate_stream_object(reg_stream
, &stream
);
2482 goto error_stream_unlock
;
2485 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2487 (void) release_ust_app_stream(-1, &stream
);
2488 goto error_stream_unlock
;
2492 * The return value is not important here. This function will output an
2495 (void) release_ust_app_stream(-1, &stream
);
2497 ua_chan
->is_sent
= 1;
2499 error_stream_unlock
:
2500 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2506 * Create and send to the application the created buffers with per UID buffers.
2508 * Return 0 on success else a negative value.
2510 static int create_channel_per_uid(struct ust_app
*app
,
2511 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2512 struct ust_app_channel
*ua_chan
)
2515 struct buffer_reg_uid
*reg_uid
;
2516 struct buffer_reg_channel
*reg_chan
;
2523 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2525 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2527 * The session creation handles the creation of this global registry
2528 * object. If none can be find, there is a code flow problem or a
2533 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2536 /* Create the buffer registry channel object. */
2537 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2539 ERR("Error creating the UST channel \"%s\" registry instance",
2546 * Create the buffers on the consumer side. This call populates the
2547 * ust app channel object with all streams and data object.
2549 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2550 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
);
2552 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2556 * Let's remove the previously created buffer registry channel so
2557 * it's not visible anymore in the session registry.
2559 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2560 ua_chan
->tracing_channel_id
);
2561 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2562 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2567 * Setup the streams and add it to the session registry.
2569 ret
= setup_buffer_reg_channel(reg_uid
->registry
, ua_chan
, reg_chan
);
2571 ERR("Error setting up UST channel \"%s\"",
2578 /* Send buffers to the application. */
2579 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2582 * Don't report error to the console, since it may be
2583 * caused by application concurrently exiting.
2593 * Create and send to the application the created buffers with per PID buffers.
2595 * Return 0 on success else a negative value.
2597 static int create_channel_per_pid(struct ust_app
*app
,
2598 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2599 struct ust_app_channel
*ua_chan
)
2602 struct ust_registry_session
*registry
;
2609 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
2613 registry
= get_session_registry(ua_sess
);
2616 /* Create and add a new channel registry to session. */
2617 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
2619 ERR("Error creating the UST channel \"%s\" registry instance",
2624 /* Create and get channel on the consumer side. */
2625 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2626 app
->bits_per_long
, registry
);
2628 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2633 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
2636 * Don't report error to the console, since it may be
2637 * caused by application concurrently exiting.
2648 * From an already allocated ust app channel, create the channel buffers if
2649 * need and send it to the application. This MUST be called with a RCU read
2650 * side lock acquired.
2652 * Return 0 on success or else a negative value.
2654 static int do_create_channel(struct ust_app
*app
,
2655 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2656 struct ust_app_channel
*ua_chan
)
2665 /* Handle buffer type before sending the channel to the application. */
2666 switch (usess
->buffer_type
) {
2667 case LTTNG_BUFFER_PER_UID
:
2669 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
2675 case LTTNG_BUFFER_PER_PID
:
2677 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
2689 /* Initialize ust objd object using the received handle and add it. */
2690 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
2691 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
2693 /* If channel is not enabled, disable it on the tracer */
2694 if (!ua_chan
->enabled
) {
2695 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2706 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2707 * newly created channel if not NULL.
2709 * Called with UST app session lock and RCU read-side lock held.
2711 * Return 0 on success or else a negative value.
2713 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
2714 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
2715 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
2716 struct ust_app_channel
**ua_chanp
)
2719 struct lttng_ht_iter iter
;
2720 struct lttng_ht_node_str
*ua_chan_node
;
2721 struct ust_app_channel
*ua_chan
;
2723 /* Lookup channel in the ust app session */
2724 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2725 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2726 if (ua_chan_node
!= NULL
) {
2727 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2731 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
2732 if (ua_chan
== NULL
) {
2733 /* Only malloc can fail here */
2737 shadow_copy_channel(ua_chan
, uchan
);
2739 /* Set channel type. */
2740 ua_chan
->attr
.type
= type
;
2742 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
2747 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
2750 /* Only add the channel if successful on the tracer side. */
2751 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
2755 *ua_chanp
= ua_chan
;
2758 /* Everything went well. */
2762 delete_ust_app_channel(ua_chan
->is_sent
? app
->sock
: -1, ua_chan
, app
);
2768 * Create UST app event and create it on the tracer side.
2770 * Called with ust app session mutex held.
2773 int create_ust_app_event(struct ust_app_session
*ua_sess
,
2774 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
2775 struct ust_app
*app
)
2778 struct ust_app_event
*ua_event
;
2780 /* Get event node */
2781 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2782 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
2783 if (ua_event
!= NULL
) {
2788 /* Does not exist so create one */
2789 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
2790 if (ua_event
== NULL
) {
2791 /* Only malloc can failed so something is really wrong */
2795 shadow_copy_event(ua_event
, uevent
);
2797 /* Create it on the tracer side */
2798 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2800 /* Not found previously means that it does not exist on the tracer */
2801 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
2805 add_unique_ust_app_event(ua_chan
, ua_event
);
2807 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
2814 /* Valid. Calling here is already in a read side lock */
2815 delete_ust_app_event(-1, ua_event
);
2820 * Create UST metadata and open it on the tracer side.
2822 * Called with UST app session lock held and RCU read side lock.
2824 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
2825 struct ust_app
*app
, struct consumer_output
*consumer
)
2828 struct ust_app_channel
*metadata
;
2829 struct consumer_socket
*socket
;
2830 struct ust_registry_session
*registry
;
2836 registry
= get_session_registry(ua_sess
);
2839 /* Metadata already exists for this registry or it was closed previously */
2840 if (registry
->metadata_key
|| registry
->metadata_closed
) {
2845 /* Allocate UST metadata */
2846 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
2848 /* malloc() failed */
2853 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
2855 /* Need one fd for the channel. */
2856 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2858 ERR("Exhausted number of available FD upon create metadata");
2862 /* Get the right consumer socket for the application. */
2863 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
2866 goto error_consumer
;
2870 * Keep metadata key so we can identify it on the consumer side. Assign it
2871 * to the registry *before* we ask the consumer so we avoid the race of the
2872 * consumer requesting the metadata and the ask_channel call on our side
2873 * did not returned yet.
2875 registry
->metadata_key
= metadata
->key
;
2878 * Ask the metadata channel creation to the consumer. The metadata object
2879 * will be created by the consumer and kept their. However, the stream is
2880 * never added or monitored until we do a first push metadata to the
2883 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
2886 /* Nullify the metadata key so we don't try to close it later on. */
2887 registry
->metadata_key
= 0;
2888 goto error_consumer
;
2892 * The setup command will make the metadata stream be sent to the relayd,
2893 * if applicable, and the thread managing the metadatas. This is important
2894 * because after this point, if an error occurs, the only way the stream
2895 * can be deleted is to be monitored in the consumer.
2897 ret
= consumer_setup_metadata(socket
, metadata
->key
);
2899 /* Nullify the metadata key so we don't try to close it later on. */
2900 registry
->metadata_key
= 0;
2901 goto error_consumer
;
2904 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
2905 metadata
->key
, app
->pid
);
2908 lttng_fd_put(LTTNG_FD_APPS
, 1);
2909 delete_ust_app_channel(-1, metadata
, app
);
2915 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2916 * acquired before calling this function.
2918 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
2920 struct ust_app
*app
= NULL
;
2921 struct lttng_ht_node_ulong
*node
;
2922 struct lttng_ht_iter iter
;
2924 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
2925 node
= lttng_ht_iter_get_node_ulong(&iter
);
2927 DBG2("UST app no found with pid %d", pid
);
2931 DBG2("Found UST app by pid %d", pid
);
2933 app
= caa_container_of(node
, struct ust_app
, pid_n
);
2940 * Allocate and init an UST app object using the registration information and
2941 * the command socket. This is called when the command socket connects to the
2944 * The object is returned on success or else NULL.
2946 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
2948 struct ust_app
*lta
= NULL
;
2953 DBG3("UST app creating application for socket %d", sock
);
2955 if ((msg
->bits_per_long
== 64 &&
2956 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
2957 || (msg
->bits_per_long
== 32 &&
2958 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
2959 ERR("Registration failed: application \"%s\" (pid: %d) has "
2960 "%d-bit long, but no consumerd for this size is available.\n",
2961 msg
->name
, msg
->pid
, msg
->bits_per_long
);
2965 lta
= zmalloc(sizeof(struct ust_app
));
2971 lta
->ppid
= msg
->ppid
;
2972 lta
->uid
= msg
->uid
;
2973 lta
->gid
= msg
->gid
;
2975 lta
->bits_per_long
= msg
->bits_per_long
;
2976 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
2977 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
2978 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
2979 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
2980 lta
->long_alignment
= msg
->long_alignment
;
2981 lta
->byte_order
= msg
->byte_order
;
2983 lta
->v_major
= msg
->major
;
2984 lta
->v_minor
= msg
->minor
;
2985 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2986 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2987 lta
->notify_sock
= -1;
2989 /* Copy name and make sure it's NULL terminated. */
2990 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
2991 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
2994 * Before this can be called, when receiving the registration information,
2995 * the application compatibility is checked. So, at this point, the
2996 * application can work with this session daemon.
2998 lta
->compatible
= 1;
3000 lta
->pid
= msg
->pid
;
3001 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
3003 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
3005 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
3012 * For a given application object, add it to every hash table.
3014 void ust_app_add(struct ust_app
*app
)
3017 assert(app
->notify_sock
>= 0);
3022 * On a re-registration, we want to kick out the previous registration of
3025 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3028 * The socket _should_ be unique until _we_ call close. So, a add_unique
3029 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3030 * already in the table.
3032 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3034 /* Add application to the notify socket hash table. */
3035 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3036 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3038 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3039 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3040 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3047 * Set the application version into the object.
3049 * Return 0 on success else a negative value either an errno code or a
3050 * LTTng-UST error code.
3052 int ust_app_version(struct ust_app
*app
)
3058 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3060 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3061 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3063 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3071 * Unregister app by removing it from the global traceable app list and freeing
3074 * The socket is already closed at this point so no close to sock.
3076 void ust_app_unregister(int sock
)
3078 struct ust_app
*lta
;
3079 struct lttng_ht_node_ulong
*node
;
3080 struct lttng_ht_iter iter
;
3081 struct ust_app_session
*ua_sess
;
3086 /* Get the node reference for a call_rcu */
3087 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
3088 node
= lttng_ht_iter_get_node_ulong(&iter
);
3091 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3092 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3094 /* Remove application from PID hash table */
3095 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3099 * Remove application from notify hash table. The thread handling the
3100 * notify socket could have deleted the node so ignore on error because
3101 * either way it's valid. The close of that socket is handled by the other
3104 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3105 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3108 * Ignore return value since the node might have been removed before by an
3109 * add replace during app registration because the PID can be reassigned by
3112 iter
.iter
.node
= <a
->pid_n
.node
;
3113 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3115 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3119 /* Remove sessions so they are not visible during deletion.*/
3120 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3122 struct ust_registry_session
*registry
;
3124 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3126 /* The session was already removed so scheduled for teardown. */
3131 * Add session to list for teardown. This is safe since at this point we
3132 * are the only one using this list.
3134 pthread_mutex_lock(&ua_sess
->lock
);
3137 * Normally, this is done in the delete session process which is
3138 * executed in the call rcu below. However, upon registration we can't
3139 * afford to wait for the grace period before pushing data or else the
3140 * data pending feature can race between the unregistration and stop
3141 * command where the data pending command is sent *before* the grace
3144 * The close metadata below nullifies the metadata pointer in the
3145 * session so the delete session will NOT push/close a second time.
3147 registry
= get_session_registry(ua_sess
);
3148 if (registry
&& !registry
->metadata_closed
) {
3149 /* Push metadata for application before freeing the application. */
3150 (void) push_metadata(registry
, ua_sess
->consumer
);
3153 * Don't ask to close metadata for global per UID buffers. Close
3154 * metadata only on destroy trace session in this case. Also, the
3155 * previous push metadata could have flag the metadata registry to
3156 * close so don't send a close command if closed.
3158 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
&&
3159 !registry
->metadata_closed
) {
3160 /* And ask to close it for this session registry. */
3161 (void) close_metadata(registry
, ua_sess
->consumer
);
3165 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3166 pthread_mutex_unlock(&ua_sess
->lock
);
3170 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3177 * Fill events array with all events name of all registered apps.
3179 int ust_app_list_events(struct lttng_event
**events
)
3182 size_t nbmem
, count
= 0;
3183 struct lttng_ht_iter iter
;
3184 struct ust_app
*app
;
3185 struct lttng_event
*tmp_event
;
3187 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3188 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3189 if (tmp_event
== NULL
) {
3190 PERROR("zmalloc ust app events");
3197 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3198 struct lttng_ust_tracepoint_iter uiter
;
3200 health_code_update();
3202 if (!app
->compatible
) {
3204 * TODO: In time, we should notice the caller of this error by
3205 * telling him that this is a version error.
3209 handle
= ustctl_tracepoint_list(app
->sock
);
3211 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3212 ERR("UST app list events getting handle failed for app pid %d",
3218 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3219 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3220 /* Handle ustctl error. */
3222 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3223 ERR("UST app tp list get failed for app %d with ret %d",
3226 DBG3("UST app tp list get failed. Application is dead");
3228 * This is normal behavior, an application can die during the
3229 * creation process. Don't report an error so the execution can
3230 * continue normally. Continue normal execution.
3238 health_code_update();
3239 if (count
>= nbmem
) {
3240 /* In case the realloc fails, we free the memory */
3241 struct lttng_event
*new_tmp_event
;
3244 new_nbmem
= nbmem
<< 1;
3245 DBG2("Reallocating event list from %zu to %zu entries",
3247 new_tmp_event
= realloc(tmp_event
,
3248 new_nbmem
* sizeof(struct lttng_event
));
3249 if (new_tmp_event
== NULL
) {
3250 PERROR("realloc ust app events");
3255 /* Zero the new memory */
3256 memset(new_tmp_event
+ nbmem
, 0,
3257 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3259 tmp_event
= new_tmp_event
;
3261 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3262 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3263 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3264 tmp_event
[count
].pid
= app
->pid
;
3265 tmp_event
[count
].enabled
= -1;
3271 *events
= tmp_event
;
3273 DBG2("UST app list events done (%zu events)", count
);
3278 health_code_update();
3283 * Fill events array with all events name of all registered apps.
3285 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3288 size_t nbmem
, count
= 0;
3289 struct lttng_ht_iter iter
;
3290 struct ust_app
*app
;
3291 struct lttng_event_field
*tmp_event
;
3293 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3294 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3295 if (tmp_event
== NULL
) {
3296 PERROR("zmalloc ust app event fields");
3303 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3304 struct lttng_ust_field_iter uiter
;
3306 health_code_update();
3308 if (!app
->compatible
) {
3310 * TODO: In time, we should notice the caller of this error by
3311 * telling him that this is a version error.
3315 handle
= ustctl_tracepoint_field_list(app
->sock
);
3317 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3318 ERR("UST app list field getting handle failed for app pid %d",
3324 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3325 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3326 /* Handle ustctl error. */
3328 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3329 ERR("UST app tp list field failed for app %d with ret %d",
3332 DBG3("UST app tp list field failed. Application is dead");
3334 * This is normal behavior, an application can die during the
3335 * creation process. Don't report an error so the execution can
3336 * continue normally. Reset list and count for next app.
3344 health_code_update();
3345 if (count
>= nbmem
) {
3346 /* In case the realloc fails, we free the memory */
3347 struct lttng_event_field
*new_tmp_event
;
3350 new_nbmem
= nbmem
<< 1;
3351 DBG2("Reallocating event field list from %zu to %zu entries",
3353 new_tmp_event
= realloc(tmp_event
,
3354 new_nbmem
* sizeof(struct lttng_event_field
));
3355 if (new_tmp_event
== NULL
) {
3356 PERROR("realloc ust app event fields");
3361 /* Zero the new memory */
3362 memset(new_tmp_event
+ nbmem
, 0,
3363 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3365 tmp_event
= new_tmp_event
;
3368 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3369 /* Mapping between these enums matches 1 to 1. */
3370 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3371 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3373 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3374 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3375 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3376 tmp_event
[count
].event
.pid
= app
->pid
;
3377 tmp_event
[count
].event
.enabled
= -1;
3383 *fields
= tmp_event
;
3385 DBG2("UST app list event fields done (%zu events)", count
);
3390 health_code_update();
3395 * Free and clean all traceable apps of the global list.
3397 * Should _NOT_ be called with RCU read-side lock held.
3399 void ust_app_clean_list(void)
3402 struct ust_app
*app
;
3403 struct lttng_ht_iter iter
;
3405 DBG2("UST app cleaning registered apps hash table");
3409 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3410 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3412 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3415 /* Cleanup socket hash table */
3416 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3418 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3422 /* Cleanup notify socket hash table */
3423 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3424 notify_sock_n
.node
) {
3425 ret
= lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3430 /* Destroy is done only when the ht is empty */
3431 ht_cleanup_push(ust_app_ht
);
3432 ht_cleanup_push(ust_app_ht_by_sock
);
3433 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3437 * Init UST app hash table.
3439 void ust_app_ht_alloc(void)
3441 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3442 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3443 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3447 * For a specific UST session, disable the channel for all registered apps.
3449 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3450 struct ltt_ust_channel
*uchan
)
3453 struct lttng_ht_iter iter
;
3454 struct lttng_ht_node_str
*ua_chan_node
;
3455 struct ust_app
*app
;
3456 struct ust_app_session
*ua_sess
;
3457 struct ust_app_channel
*ua_chan
;
3459 if (usess
== NULL
|| uchan
== NULL
) {
3460 ERR("Disabling UST global channel with NULL values");
3465 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3466 uchan
->name
, usess
->id
);
3470 /* For every registered applications */
3471 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3472 struct lttng_ht_iter uiter
;
3473 if (!app
->compatible
) {
3475 * TODO: In time, we should notice the caller of this error by
3476 * telling him that this is a version error.
3480 ua_sess
= lookup_session_by_app(usess
, app
);
3481 if (ua_sess
== NULL
) {
3486 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3487 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3488 /* If the session if found for the app, the channel must be there */
3489 assert(ua_chan_node
);
3491 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3492 /* The channel must not be already disabled */
3493 assert(ua_chan
->enabled
== 1);
3495 /* Disable channel onto application */
3496 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
3498 /* XXX: We might want to report this error at some point... */
3510 * For a specific UST session, enable the channel for all registered apps.
3512 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
3513 struct ltt_ust_channel
*uchan
)
3516 struct lttng_ht_iter iter
;
3517 struct ust_app
*app
;
3518 struct ust_app_session
*ua_sess
;
3520 if (usess
== NULL
|| uchan
== NULL
) {
3521 ERR("Adding UST global channel to NULL values");
3526 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
3527 uchan
->name
, usess
->id
);
3531 /* For every registered applications */
3532 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3533 if (!app
->compatible
) {
3535 * TODO: In time, we should notice the caller of this error by
3536 * telling him that this is a version error.
3540 ua_sess
= lookup_session_by_app(usess
, app
);
3541 if (ua_sess
== NULL
) {
3545 /* Enable channel onto application */
3546 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
3548 /* XXX: We might want to report this error at some point... */
3560 * Disable an event in a channel and for a specific session.
3562 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
3563 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3566 struct lttng_ht_iter iter
, uiter
;
3567 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
3568 struct ust_app
*app
;
3569 struct ust_app_session
*ua_sess
;
3570 struct ust_app_channel
*ua_chan
;
3571 struct ust_app_event
*ua_event
;
3573 DBG("UST app disabling event %s for all apps in channel "
3574 "%s for session id %" PRIu64
,
3575 uevent
->attr
.name
, uchan
->name
, usess
->id
);
3579 /* For all registered applications */
3580 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3581 if (!app
->compatible
) {
3583 * TODO: In time, we should notice the caller of this error by
3584 * telling him that this is a version error.
3588 ua_sess
= lookup_session_by_app(usess
, app
);
3589 if (ua_sess
== NULL
) {
3594 /* Lookup channel in the ust app session */
3595 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3596 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3597 if (ua_chan_node
== NULL
) {
3598 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
3599 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
3602 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3604 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
3605 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
3606 if (ua_event_node
== NULL
) {
3607 DBG2("Event %s not found in channel %s for app pid %d."
3608 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
3611 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
3613 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
3615 /* XXX: Report error someday... */
3626 * For a specific UST session, create the channel for all registered apps.
3628 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
3629 struct ltt_ust_channel
*uchan
)
3631 int ret
= 0, created
;
3632 struct lttng_ht_iter iter
;
3633 struct ust_app
*app
;
3634 struct ust_app_session
*ua_sess
= NULL
;
3636 /* Very wrong code flow */
3640 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64
,
3641 uchan
->name
, usess
->id
);
3645 /* For every registered applications */
3646 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3647 if (!app
->compatible
) {
3649 * TODO: In time, we should notice the caller of this error by
3650 * telling him that this is a version error.
3655 * Create session on the tracer side and add it to app session HT. Note
3656 * that if session exist, it will simply return a pointer to the ust
3659 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
3664 * The application's socket is not valid. Either a bad socket
3665 * or a timeout on it. We can't inform the caller that for a
3666 * specific app, the session failed so lets continue here.
3671 goto error_rcu_unlock
;
3676 pthread_mutex_lock(&ua_sess
->lock
);
3677 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
3678 sizeof(uchan
->name
))) {
3679 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
, &uchan
->attr
);
3682 /* Create channel onto application. We don't need the chan ref. */
3683 ret
= create_ust_app_channel(ua_sess
, uchan
, app
,
3684 LTTNG_UST_CHAN_PER_CPU
, usess
, NULL
);
3686 pthread_mutex_unlock(&ua_sess
->lock
);
3688 if (ret
== -ENOMEM
) {
3689 /* No more memory is a fatal error. Stop right now. */
3690 goto error_rcu_unlock
;
3692 /* Cleanup the created session if it's the case. */
3694 destroy_app_session(app
, ua_sess
);
3705 * Enable event for a specific session and channel on the tracer.
3707 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
3708 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3711 struct lttng_ht_iter iter
, uiter
;
3712 struct lttng_ht_node_str
*ua_chan_node
;
3713 struct ust_app
*app
;
3714 struct ust_app_session
*ua_sess
;
3715 struct ust_app_channel
*ua_chan
;
3716 struct ust_app_event
*ua_event
;
3718 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
3719 uevent
->attr
.name
, usess
->id
);
3722 * NOTE: At this point, this function is called only if the session and
3723 * channel passed are already created for all apps. and enabled on the
3729 /* For all registered applications */
3730 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3731 if (!app
->compatible
) {
3733 * TODO: In time, we should notice the caller of this error by
3734 * telling him that this is a version error.
3738 ua_sess
= lookup_session_by_app(usess
, app
);
3740 /* The application has problem or is probably dead. */
3744 pthread_mutex_lock(&ua_sess
->lock
);
3746 /* Lookup channel in the ust app session */
3747 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3748 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3749 /* If the channel is not found, there is a code flow error */
3750 assert(ua_chan_node
);
3752 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3754 /* Get event node */
3755 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
3756 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
3757 if (ua_event
== NULL
) {
3758 DBG3("UST app enable event %s not found for app PID %d."
3759 "Skipping app", uevent
->attr
.name
, app
->pid
);
3763 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
3765 pthread_mutex_unlock(&ua_sess
->lock
);
3769 pthread_mutex_unlock(&ua_sess
->lock
);
3778 * For a specific existing UST session and UST channel, creates the event for
3779 * all registered apps.
3781 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
3782 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3785 struct lttng_ht_iter iter
, uiter
;
3786 struct lttng_ht_node_str
*ua_chan_node
;
3787 struct ust_app
*app
;
3788 struct ust_app_session
*ua_sess
;
3789 struct ust_app_channel
*ua_chan
;
3791 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
3792 uevent
->attr
.name
, usess
->id
);
3796 /* For all registered applications */
3797 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3798 if (!app
->compatible
) {
3800 * TODO: In time, we should notice the caller of this error by
3801 * telling him that this is a version error.
3805 ua_sess
= lookup_session_by_app(usess
, app
);
3807 /* The application has problem or is probably dead. */
3811 pthread_mutex_lock(&ua_sess
->lock
);
3812 /* Lookup channel in the ust app session */
3813 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3814 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3815 /* If the channel is not found, there is a code flow error */
3816 assert(ua_chan_node
);
3818 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3820 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
3821 pthread_mutex_unlock(&ua_sess
->lock
);
3823 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
3824 /* Possible value at this point: -ENOMEM. If so, we stop! */
3827 DBG2("UST app event %s already exist on app PID %d",
3828 uevent
->attr
.name
, app
->pid
);
3839 * Start tracing for a specific UST session and app.
3842 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3845 struct ust_app_session
*ua_sess
;
3847 DBG("Starting tracing for ust app pid %d", app
->pid
);
3851 if (!app
->compatible
) {
3855 ua_sess
= lookup_session_by_app(usess
, app
);
3856 if (ua_sess
== NULL
) {
3857 /* The session is in teardown process. Ignore and continue. */
3861 pthread_mutex_lock(&ua_sess
->lock
);
3863 /* Upon restart, we skip the setup, already done */
3864 if (ua_sess
->started
) {
3868 /* Create directories if consumer is LOCAL and has a path defined. */
3869 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
3870 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
3871 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
3872 S_IRWXU
| S_IRWXG
, ua_sess
->euid
, ua_sess
->egid
);
3874 if (ret
!= -EEXIST
) {
3875 ERR("Trace directory creation error");
3882 * Create the metadata for the application. This returns gracefully if a
3883 * metadata was already set for the session.
3885 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
3890 health_code_update();
3893 /* This start the UST tracing */
3894 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
3896 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3897 ERR("Error starting tracing for app pid: %d (ret: %d)",
3900 DBG("UST app start session failed. Application is dead.");
3902 * This is normal behavior, an application can die during the
3903 * creation process. Don't report an error so the execution can
3904 * continue normally.
3906 pthread_mutex_unlock(&ua_sess
->lock
);
3912 /* Indicate that the session has been started once */
3913 ua_sess
->started
= 1;
3915 pthread_mutex_unlock(&ua_sess
->lock
);
3917 health_code_update();
3919 /* Quiescent wait after starting trace */
3920 ret
= ustctl_wait_quiescent(app
->sock
);
3921 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3922 ERR("UST app wait quiescent failed for app pid %d ret %d",
3928 health_code_update();
3932 pthread_mutex_unlock(&ua_sess
->lock
);
3934 health_code_update();
3939 * Stop tracing for a specific UST session and app.
3942 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3945 struct ust_app_session
*ua_sess
;
3946 struct ust_registry_session
*registry
;
3948 DBG("Stopping tracing for ust app pid %d", app
->pid
);
3952 if (!app
->compatible
) {
3953 goto end_no_session
;
3956 ua_sess
= lookup_session_by_app(usess
, app
);
3957 if (ua_sess
== NULL
) {
3958 goto end_no_session
;
3961 pthread_mutex_lock(&ua_sess
->lock
);
3964 * If started = 0, it means that stop trace has been called for a session
3965 * that was never started. It's possible since we can have a fail start
3966 * from either the application manager thread or the command thread. Simply
3967 * indicate that this is a stop error.
3969 if (!ua_sess
->started
) {
3970 goto error_rcu_unlock
;
3973 health_code_update();
3975 /* This inhibits UST tracing */
3976 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
3978 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3979 ERR("Error stopping tracing for app pid: %d (ret: %d)",
3982 DBG("UST app stop session failed. Application is dead.");
3984 * This is normal behavior, an application can die during the
3985 * creation process. Don't report an error so the execution can
3986 * continue normally.
3990 goto error_rcu_unlock
;
3993 health_code_update();
3995 /* Quiescent wait after stopping trace */
3996 ret
= ustctl_wait_quiescent(app
->sock
);
3997 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3998 ERR("UST app wait quiescent failed for app pid %d ret %d",
4002 health_code_update();
4004 registry
= get_session_registry(ua_sess
);
4007 if (!registry
->metadata_closed
) {
4008 /* Push metadata for application before freeing the application. */
4009 (void) push_metadata(registry
, ua_sess
->consumer
);
4013 pthread_mutex_unlock(&ua_sess
->lock
);
4016 health_code_update();
4020 pthread_mutex_unlock(&ua_sess
->lock
);
4022 health_code_update();
4027 * Flush buffers for a specific UST session and app.
4030 int ust_app_flush_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4033 struct lttng_ht_iter iter
;
4034 struct ust_app_session
*ua_sess
;
4035 struct ust_app_channel
*ua_chan
;
4037 DBG("Flushing buffers for ust app pid %d", app
->pid
);
4041 if (!app
->compatible
) {
4042 goto end_no_session
;
4045 ua_sess
= lookup_session_by_app(usess
, app
);
4046 if (ua_sess
== NULL
) {
4047 goto end_no_session
;
4050 pthread_mutex_lock(&ua_sess
->lock
);
4052 health_code_update();
4054 /* Flushing buffers */
4055 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4057 health_code_update();
4058 assert(ua_chan
->is_sent
);
4059 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
4061 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4062 ERR("UST app PID %d channel %s flush failed with ret %d",
4063 app
->pid
, ua_chan
->name
, ret
);
4065 DBG3("UST app failed to flush %s. Application is dead.",
4068 * This is normal behavior, an application can die during the
4069 * creation process. Don't report an error so the execution can
4070 * continue normally.
4073 /* Continuing flushing all buffers */
4078 health_code_update();
4080 pthread_mutex_unlock(&ua_sess
->lock
);
4083 health_code_update();
4088 * Destroy a specific UST session in apps.
4090 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4093 struct ust_app_session
*ua_sess
;
4094 struct lttng_ht_iter iter
;
4095 struct lttng_ht_node_u64
*node
;
4097 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4101 if (!app
->compatible
) {
4105 __lookup_session_by_app(usess
, app
, &iter
);
4106 node
= lttng_ht_iter_get_node_u64(&iter
);
4108 /* Session is being or is deleted. */
4111 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4113 health_code_update();
4114 destroy_app_session(app
, ua_sess
);
4116 health_code_update();
4118 /* Quiescent wait after stopping trace */
4119 ret
= ustctl_wait_quiescent(app
->sock
);
4120 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4121 ERR("UST app wait quiescent failed for app pid %d ret %d",
4126 health_code_update();
4131 * Start tracing for the UST session.
4133 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4136 struct lttng_ht_iter iter
;
4137 struct ust_app
*app
;
4139 DBG("Starting all UST traces");
4143 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4144 ret
= ust_app_start_trace(usess
, app
);
4146 /* Continue to next apps even on error */
4157 * Start tracing for the UST session.
4159 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4162 struct lttng_ht_iter iter
;
4163 struct ust_app
*app
;
4165 DBG("Stopping all UST traces");
4169 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4170 ret
= ust_app_stop_trace(usess
, app
);
4172 /* Continue to next apps even on error */
4177 /* Flush buffers and push metadata (for UID buffers). */
4178 switch (usess
->buffer_type
) {
4179 case LTTNG_BUFFER_PER_UID
:
4181 struct buffer_reg_uid
*reg
;
4183 /* Flush all per UID buffers associated to that session. */
4184 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4185 struct ust_registry_session
*ust_session_reg
;
4186 struct buffer_reg_channel
*reg_chan
;
4187 struct consumer_socket
*socket
;
4189 /* Get consumer socket to use to push the metadata.*/
4190 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4193 /* Ignore request if no consumer is found for the session. */
4197 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4198 reg_chan
, node
.node
) {
4200 * The following call will print error values so the return
4201 * code is of little importance because whatever happens, we
4202 * have to try them all.
4204 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4207 ust_session_reg
= reg
->registry
->reg
.ust
;
4208 if (!ust_session_reg
->metadata_closed
) {
4209 /* Push metadata. */
4210 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4216 case LTTNG_BUFFER_PER_PID
:
4217 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4218 ret
= ust_app_flush_trace(usess
, app
);
4220 /* Continue to next apps even on error */
4236 * Destroy app UST session.
4238 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
4241 struct lttng_ht_iter iter
;
4242 struct ust_app
*app
;
4244 DBG("Destroy all UST traces");
4248 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4249 ret
= destroy_trace(usess
, app
);
4251 /* Continue to next apps even on error */
4262 * Add channels/events from UST global domain to registered apps at sock.
4264 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
4267 struct lttng_ht_iter iter
, uiter
;
4268 struct ust_app
*app
;
4269 struct ust_app_session
*ua_sess
= NULL
;
4270 struct ust_app_channel
*ua_chan
;
4271 struct ust_app_event
*ua_event
;
4272 struct ust_app_ctx
*ua_ctx
;
4277 DBG2("UST app global update for app sock %d for session id %" PRIu64
, sock
,
4282 app
= ust_app_find_by_sock(sock
);
4285 * Application can be unregistered before so this is possible hence
4286 * simply stopping the update.
4288 DBG3("UST app update failed to find app sock %d", sock
);
4292 if (!app
->compatible
) {
4296 ret
= create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
4298 /* Tracer is probably gone or ENOMEM. */
4303 pthread_mutex_lock(&ua_sess
->lock
);
4306 * We can iterate safely here over all UST app session since the create ust
4307 * app session above made a shadow copy of the UST global domain from the
4310 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4312 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
4315 * Stop everything. On error, the application failed, no more
4316 * file descriptor are available or ENOMEM so stopping here is
4317 * the only thing we can do for now.
4323 * Add context using the list so they are enabled in the same order the
4326 cds_list_for_each_entry(ua_ctx
, &ua_chan
->ctx_list
, list
) {
4327 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
4334 /* For each events */
4335 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
4337 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
4344 pthread_mutex_unlock(&ua_sess
->lock
);
4346 if (usess
->active
) {
4347 ret
= ust_app_start_trace(usess
, app
);
4352 DBG2("UST trace started for app pid %d", app
->pid
);
4355 /* Everything went well at this point. */
4360 pthread_mutex_unlock(&ua_sess
->lock
);
4363 destroy_app_session(app
, ua_sess
);
4370 * Add context to a specific channel for global UST domain.
4372 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
4373 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
4376 struct lttng_ht_node_str
*ua_chan_node
;
4377 struct lttng_ht_iter iter
, uiter
;
4378 struct ust_app_channel
*ua_chan
= NULL
;
4379 struct ust_app_session
*ua_sess
;
4380 struct ust_app
*app
;
4384 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4385 if (!app
->compatible
) {
4387 * TODO: In time, we should notice the caller of this error by
4388 * telling him that this is a version error.
4392 ua_sess
= lookup_session_by_app(usess
, app
);
4393 if (ua_sess
== NULL
) {
4397 pthread_mutex_lock(&ua_sess
->lock
);
4398 /* Lookup channel in the ust app session */
4399 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4400 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4401 if (ua_chan_node
== NULL
) {
4404 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
4406 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
4411 pthread_mutex_unlock(&ua_sess
->lock
);
4419 * Enable event for a channel from a UST session for a specific PID.
4421 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
4422 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
4425 struct lttng_ht_iter iter
;
4426 struct lttng_ht_node_str
*ua_chan_node
;
4427 struct ust_app
*app
;
4428 struct ust_app_session
*ua_sess
;
4429 struct ust_app_channel
*ua_chan
;
4430 struct ust_app_event
*ua_event
;
4432 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
4436 app
= ust_app_find_by_pid(pid
);
4438 ERR("UST app enable event per PID %d not found", pid
);
4443 if (!app
->compatible
) {
4448 ua_sess
= lookup_session_by_app(usess
, app
);
4450 /* The application has problem or is probably dead. */
4455 pthread_mutex_lock(&ua_sess
->lock
);
4456 /* Lookup channel in the ust app session */
4457 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
4458 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
4459 /* If the channel is not found, there is a code flow error */
4460 assert(ua_chan_node
);
4462 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4464 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4465 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4466 if (ua_event
== NULL
) {
4467 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4472 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4479 pthread_mutex_unlock(&ua_sess
->lock
);
4486 * Calibrate registered applications.
4488 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
4491 struct lttng_ht_iter iter
;
4492 struct ust_app
*app
;
4496 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4497 if (!app
->compatible
) {
4499 * TODO: In time, we should notice the caller of this error by
4500 * telling him that this is a version error.
4505 health_code_update();
4507 ret
= ustctl_calibrate(app
->sock
, calibrate
);
4511 /* Means that it's not implemented on the tracer side. */
4515 DBG2("Calibrate app PID %d returned with error %d",
4522 DBG("UST app global domain calibration finished");
4526 health_code_update();
4532 * Receive registration and populate the given msg structure.
4534 * On success return 0 else a negative value returned by the ustctl call.
4536 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
4539 uint32_t pid
, ppid
, uid
, gid
;
4543 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
4544 &pid
, &ppid
, &uid
, &gid
,
4545 &msg
->bits_per_long
,
4546 &msg
->uint8_t_alignment
,
4547 &msg
->uint16_t_alignment
,
4548 &msg
->uint32_t_alignment
,
4549 &msg
->uint64_t_alignment
,
4550 &msg
->long_alignment
,
4557 case LTTNG_UST_ERR_EXITING
:
4558 DBG3("UST app recv reg message failed. Application died");
4560 case LTTNG_UST_ERR_UNSUP_MAJOR
:
4561 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
4562 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
4563 LTTNG_UST_ABI_MINOR_VERSION
);
4566 ERR("UST app recv reg message failed with ret %d", ret
);
4571 msg
->pid
= (pid_t
) pid
;
4572 msg
->ppid
= (pid_t
) ppid
;
4573 msg
->uid
= (uid_t
) uid
;
4574 msg
->gid
= (gid_t
) gid
;
4581 * Return a ust app channel object using the application object and the channel
4582 * object descriptor has a key. If not found, NULL is returned. A RCU read side
4583 * lock MUST be acquired before calling this function.
4585 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
4588 struct lttng_ht_node_ulong
*node
;
4589 struct lttng_ht_iter iter
;
4590 struct ust_app_channel
*ua_chan
= NULL
;
4594 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
4595 node
= lttng_ht_iter_get_node_ulong(&iter
);
4597 DBG2("UST app channel find by objd %d not found", objd
);
4601 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
4608 * Reply to a register channel notification from an application on the notify
4609 * socket. The channel metadata is also created.
4611 * The session UST registry lock is acquired in this function.
4613 * On success 0 is returned else a negative value.
4615 static int reply_ust_register_channel(int sock
, int sobjd
, int cobjd
,
4616 size_t nr_fields
, struct ustctl_field
*fields
)
4618 int ret
, ret_code
= 0;
4619 uint32_t chan_id
, reg_count
;
4620 uint64_t chan_reg_key
;
4621 enum ustctl_channel_header type
;
4622 struct ust_app
*app
;
4623 struct ust_app_channel
*ua_chan
;
4624 struct ust_app_session
*ua_sess
;
4625 struct ust_registry_session
*registry
;
4626 struct ust_registry_channel
*chan_reg
;
4630 /* Lookup application. If not found, there is a code flow error. */
4631 app
= find_app_by_notify_sock(sock
);
4633 DBG("Application socket %d is being teardown. Abort event notify",
4637 goto error_rcu_unlock
;
4640 /* Lookup channel by UST object descriptor. */
4641 ua_chan
= find_channel_by_objd(app
, cobjd
);
4643 DBG("Application channel is being teardown. Abort event notify");
4646 goto error_rcu_unlock
;
4649 assert(ua_chan
->session
);
4650 ua_sess
= ua_chan
->session
;
4652 /* Get right session registry depending on the session buffer type. */
4653 registry
= get_session_registry(ua_sess
);
4656 /* Depending on the buffer type, a different channel key is used. */
4657 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4658 chan_reg_key
= ua_chan
->tracing_channel_id
;
4660 chan_reg_key
= ua_chan
->key
;
4663 pthread_mutex_lock(®istry
->lock
);
4665 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
4668 if (!chan_reg
->register_done
) {
4669 reg_count
= ust_registry_get_event_count(chan_reg
);
4670 if (reg_count
< 31) {
4671 type
= USTCTL_CHANNEL_HEADER_COMPACT
;
4673 type
= USTCTL_CHANNEL_HEADER_LARGE
;
4676 chan_reg
->nr_ctx_fields
= nr_fields
;
4677 chan_reg
->ctx_fields
= fields
;
4678 chan_reg
->header_type
= type
;
4680 /* Get current already assigned values. */
4681 type
= chan_reg
->header_type
;
4683 /* Set to NULL so the error path does not do a double free. */
4686 /* Channel id is set during the object creation. */
4687 chan_id
= chan_reg
->chan_id
;
4689 /* Append to metadata */
4690 if (!chan_reg
->metadata_dumped
) {
4691 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
4693 ERR("Error appending channel metadata (errno = %d)", ret_code
);
4699 DBG3("UST app replying to register channel key %" PRIu64
4700 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
4703 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
4705 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4706 ERR("UST app reply channel failed with ret %d", ret
);
4708 DBG3("UST app reply channel failed. Application died");
4713 /* This channel registry registration is completed. */
4714 chan_reg
->register_done
= 1;
4717 pthread_mutex_unlock(®istry
->lock
);
4727 * Add event to the UST channel registry. When the event is added to the
4728 * registry, the metadata is also created. Once done, this replies to the
4729 * application with the appropriate error code.
4731 * The session UST registry lock is acquired in the function.
4733 * On success 0 is returned else a negative value.
4735 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
4736 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
, int loglevel
,
4737 char *model_emf_uri
)
4740 uint32_t event_id
= 0;
4741 uint64_t chan_reg_key
;
4742 struct ust_app
*app
;
4743 struct ust_app_channel
*ua_chan
;
4744 struct ust_app_session
*ua_sess
;
4745 struct ust_registry_session
*registry
;
4749 /* Lookup application. If not found, there is a code flow error. */
4750 app
= find_app_by_notify_sock(sock
);
4752 DBG("Application socket %d is being teardown. Abort event notify",
4757 free(model_emf_uri
);
4758 goto error_rcu_unlock
;
4761 /* Lookup channel by UST object descriptor. */
4762 ua_chan
= find_channel_by_objd(app
, cobjd
);
4764 DBG("Application channel is being teardown. Abort event notify");
4768 free(model_emf_uri
);
4769 goto error_rcu_unlock
;
4772 assert(ua_chan
->session
);
4773 ua_sess
= ua_chan
->session
;
4775 registry
= get_session_registry(ua_sess
);
4778 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4779 chan_reg_key
= ua_chan
->tracing_channel_id
;
4781 chan_reg_key
= ua_chan
->key
;
4784 pthread_mutex_lock(®istry
->lock
);
4787 * From this point on, this call acquires the ownership of the sig, fields
4788 * and model_emf_uri meaning any free are done inside it if needed. These
4789 * three variables MUST NOT be read/write after this.
4791 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
4792 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
, loglevel
,
4793 model_emf_uri
, ua_sess
->buffer_type
, &event_id
,
4797 * The return value is returned to ustctl so in case of an error, the
4798 * application can be notified. In case of an error, it's important not to
4799 * return a negative error or else the application will get closed.
4801 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
4803 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4804 ERR("UST app reply event failed with ret %d", ret
);
4806 DBG3("UST app reply event failed. Application died");
4809 * No need to wipe the create event since the application socket will
4810 * get close on error hence cleaning up everything by itself.
4815 DBG3("UST registry event %s with id %" PRId32
" added successfully",
4819 pthread_mutex_unlock(®istry
->lock
);
4826 * Handle application notification through the given notify socket.
4828 * Return 0 on success or else a negative value.
4830 int ust_app_recv_notify(int sock
)
4833 enum ustctl_notify_cmd cmd
;
4835 DBG3("UST app receiving notify from sock %d", sock
);
4837 ret
= ustctl_recv_notify(sock
, &cmd
);
4839 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4840 ERR("UST app recv notify failed with ret %d", ret
);
4842 DBG3("UST app recv notify failed. Application died");
4848 case USTCTL_NOTIFY_CMD_EVENT
:
4850 int sobjd
, cobjd
, loglevel
;
4851 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
4853 struct ustctl_field
*fields
;
4855 DBG2("UST app ustctl register event received");
4857 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
, &loglevel
,
4858 &sig
, &nr_fields
, &fields
, &model_emf_uri
);
4860 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4861 ERR("UST app recv event failed with ret %d", ret
);
4863 DBG3("UST app recv event failed. Application died");
4869 * Add event to the UST registry coming from the notify socket. This
4870 * call will free if needed the sig, fields and model_emf_uri. This
4871 * code path loses the ownsership of these variables and transfer them
4872 * to the this function.
4874 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
4875 fields
, loglevel
, model_emf_uri
);
4882 case USTCTL_NOTIFY_CMD_CHANNEL
:
4886 struct ustctl_field
*fields
;
4888 DBG2("UST app ustctl register channel received");
4890 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
4893 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4894 ERR("UST app recv channel failed with ret %d", ret
);
4896 DBG3("UST app recv channel failed. Application died");
4902 * The fields ownership are transfered to this function call meaning
4903 * that if needed it will be freed. After this, it's invalid to access
4904 * fields or clean it up.
4906 ret
= reply_ust_register_channel(sock
, sobjd
, cobjd
, nr_fields
,
4915 /* Should NEVER happen. */
4924 * Once the notify socket hangs up, this is called. First, it tries to find the
4925 * corresponding application. On failure, the call_rcu to close the socket is
4926 * executed. If an application is found, it tries to delete it from the notify
4927 * socket hash table. Whathever the result, it proceeds to the call_rcu.
4929 * Note that an object needs to be allocated here so on ENOMEM failure, the
4930 * call RCU is not done but the rest of the cleanup is.
4932 void ust_app_notify_sock_unregister(int sock
)
4935 struct lttng_ht_iter iter
;
4936 struct ust_app
*app
;
4937 struct ust_app_notify_sock_obj
*obj
;
4943 obj
= zmalloc(sizeof(*obj
));
4946 * An ENOMEM is kind of uncool. If this strikes we continue the
4947 * procedure but the call_rcu will not be called. In this case, we
4948 * accept the fd leak rather than possibly creating an unsynchronized
4949 * state between threads.
4951 * TODO: The notify object should be created once the notify socket is
4952 * registered and stored independantely from the ust app object. The
4953 * tricky part is to synchronize the teardown of the application and
4954 * this notify object. Let's keep that in mind so we can avoid this
4955 * kind of shenanigans with ENOMEM in the teardown path.
4962 DBG("UST app notify socket unregister %d", sock
);
4965 * Lookup application by notify socket. If this fails, this means that the
4966 * hash table delete has already been done by the application
4967 * unregistration process so we can safely close the notify socket in a
4970 app
= find_app_by_notify_sock(sock
);
4975 iter
.iter
.node
= &app
->notify_sock_n
.node
;
4978 * Whatever happens here either we fail or succeed, in both cases we have
4979 * to close the socket after a grace period to continue to the call RCU
4980 * here. If the deletion is successful, the application is not visible
4981 * anymore by other threads and is it fails it means that it was already
4982 * deleted from the hash table so either way we just have to close the
4985 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
4991 * Close socket after a grace period to avoid for the socket to be reused
4992 * before the application object is freed creating potential race between
4993 * threads trying to add unique in the global hash table.
4996 call_rcu(&obj
->head
, close_notify_sock_rcu
);
5001 * Destroy a ust app data structure and free its memory.
5003 void ust_app_destroy(struct ust_app
*app
)
5009 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
5013 * Take a snapshot for a given UST session. The snapshot is sent to the given
5016 * Return 0 on success or else a negative value.
5018 int ust_app_snapshot_record(struct ltt_ust_session
*usess
,
5019 struct snapshot_output
*output
, int wait
, uint64_t max_stream_size
)
5022 unsigned int snapshot_done
= 0;
5023 struct lttng_ht_iter iter
;
5024 struct ust_app
*app
;
5025 char pathname
[PATH_MAX
];
5032 switch (usess
->buffer_type
) {
5033 case LTTNG_BUFFER_PER_UID
:
5035 struct buffer_reg_uid
*reg
;
5037 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5038 struct buffer_reg_channel
*reg_chan
;
5039 struct consumer_socket
*socket
;
5041 /* Get consumer socket to use to push the metadata.*/
5042 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5049 memset(pathname
, 0, sizeof(pathname
));
5050 ret
= snprintf(pathname
, sizeof(pathname
),
5051 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5052 reg
->uid
, reg
->bits_per_long
);
5054 PERROR("snprintf snapshot path");
5058 /* Add the UST default trace dir to path. */
5059 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5060 reg_chan
, node
.node
) {
5061 ret
= consumer_snapshot_channel(socket
, reg_chan
->consumer_key
,
5062 output
, 0, usess
->uid
, usess
->gid
, pathname
, wait
,
5068 ret
= consumer_snapshot_channel(socket
,
5069 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5070 usess
->uid
, usess
->gid
, pathname
, wait
, max_stream_size
);
5078 case LTTNG_BUFFER_PER_PID
:
5080 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5081 struct consumer_socket
*socket
;
5082 struct lttng_ht_iter chan_iter
;
5083 struct ust_app_channel
*ua_chan
;
5084 struct ust_app_session
*ua_sess
;
5085 struct ust_registry_session
*registry
;
5087 ua_sess
= lookup_session_by_app(usess
, app
);
5089 /* Session not associated with this app. */
5093 /* Get the right consumer socket for the application. */
5094 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
5101 /* Add the UST default trace dir to path. */
5102 memset(pathname
, 0, sizeof(pathname
));
5103 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
5106 PERROR("snprintf snapshot path");
5110 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5111 ua_chan
, node
.node
) {
5112 ret
= consumer_snapshot_channel(socket
, ua_chan
->key
, output
,
5113 0, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
5120 registry
= get_session_registry(ua_sess
);
5122 ret
= consumer_snapshot_channel(socket
, registry
->metadata_key
, output
,
5123 1, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
5137 if (!snapshot_done
) {
5139 * If no snapshot was made and we are not in the error path, this means
5140 * that there are no buffers thus no (prior) application to snapshot
5141 * data from so we have simply NO data.
5152 * Return the number of streams for a UST session.
5154 unsigned int ust_app_get_nb_stream(struct ltt_ust_session
*usess
)
5156 unsigned int ret
= 0;
5157 struct ust_app
*app
;
5158 struct lttng_ht_iter iter
;
5162 switch (usess
->buffer_type
) {
5163 case LTTNG_BUFFER_PER_UID
:
5165 struct buffer_reg_uid
*reg
;
5167 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5168 struct buffer_reg_channel
*reg_chan
;
5171 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5172 reg_chan
, node
.node
) {
5173 ret
+= reg_chan
->stream_count
;
5179 case LTTNG_BUFFER_PER_PID
:
5182 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5183 struct ust_app_channel
*ua_chan
;
5184 struct ust_app_session
*ua_sess
;
5185 struct lttng_ht_iter chan_iter
;
5187 ua_sess
= lookup_session_by_app(usess
, app
);
5189 /* Session not associated with this app. */
5193 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5194 ua_chan
, node
.node
) {
5195 ret
+= ua_chan
->streams
.count
;