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.
26 #include <sys/types.h>
28 #include <urcu/compiler.h>
29 #include <lttng/ust-error.h>
32 #include <common/common.h>
33 #include <common/sessiond-comm/sessiond-comm.h>
35 #include "buffer-registry.h"
37 #include "health-sessiond.h"
39 #include "ust-consumer.h"
43 /* Next available channel key. Access under next_channel_key_lock. */
44 static uint64_t _next_channel_key
;
45 static pthread_mutex_t next_channel_key_lock
= PTHREAD_MUTEX_INITIALIZER
;
47 /* Next available session ID. Access under next_session_id_lock. */
48 static uint64_t _next_session_id
;
49 static pthread_mutex_t next_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
52 * Return the incremented value of next_channel_key.
54 static uint64_t get_next_channel_key(void)
58 pthread_mutex_lock(&next_channel_key_lock
);
59 ret
= ++_next_channel_key
;
60 pthread_mutex_unlock(&next_channel_key_lock
);
65 * Return the atomically incremented value of next_session_id.
67 static uint64_t get_next_session_id(void)
71 pthread_mutex_lock(&next_session_id_lock
);
72 ret
= ++_next_session_id
;
73 pthread_mutex_unlock(&next_session_id_lock
);
77 static void copy_channel_attr_to_ustctl(
78 struct ustctl_consumer_channel_attr
*attr
,
79 struct lttng_ust_channel_attr
*uattr
)
81 /* Copy event attributes since the layout is different. */
82 attr
->subbuf_size
= uattr
->subbuf_size
;
83 attr
->num_subbuf
= uattr
->num_subbuf
;
84 attr
->overwrite
= uattr
->overwrite
;
85 attr
->switch_timer_interval
= uattr
->switch_timer_interval
;
86 attr
->read_timer_interval
= uattr
->read_timer_interval
;
87 attr
->output
= uattr
->output
;
91 * Match function for the hash table lookup.
93 * It matches an ust app event based on three attributes which are the event
94 * name, the filter bytecode and the loglevel.
96 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
98 struct ust_app_event
*event
;
99 const struct ust_app_ht_key
*key
;
104 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
107 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
110 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
114 /* Event loglevel. */
115 if (event
->attr
.loglevel
!= key
->loglevel
) {
116 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
117 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
119 * Match is accepted. This is because on event creation, the
120 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
121 * -1 are accepted for this loglevel type since 0 is the one set by
122 * the API when receiving an enable event.
129 /* One of the filters is NULL, fail. */
130 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
134 if (key
->filter
&& event
->filter
) {
135 /* Both filters exists, check length followed by the bytecode. */
136 if (event
->filter
->len
!= key
->filter
->len
||
137 memcmp(event
->filter
->data
, key
->filter
->data
,
138 event
->filter
->len
) != 0) {
143 /* One of the exclusions is NULL, fail. */
144 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
148 if (key
->exclusion
&& event
->exclusion
) {
149 /* Both exclusions exists, check count followed by the names. */
150 if (event
->exclusion
->count
!= key
->exclusion
->count
||
151 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
152 event
->exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) != 0) {
166 * Unique add of an ust app event in the given ht. This uses the custom
167 * ht_match_ust_app_event match function and the event name as hash.
169 static void add_unique_ust_app_event(struct ust_app_channel
*ua_chan
,
170 struct ust_app_event
*event
)
172 struct cds_lfht_node
*node_ptr
;
173 struct ust_app_ht_key key
;
177 assert(ua_chan
->events
);
180 ht
= ua_chan
->events
;
181 key
.name
= event
->attr
.name
;
182 key
.filter
= event
->filter
;
183 key
.loglevel
= event
->attr
.loglevel
;
184 key
.exclusion
= event
->exclusion
;
186 node_ptr
= cds_lfht_add_unique(ht
->ht
,
187 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
188 ht_match_ust_app_event
, &key
, &event
->node
.node
);
189 assert(node_ptr
== &event
->node
.node
);
193 * Close the notify socket from the given RCU head object. This MUST be called
194 * through a call_rcu().
196 static void close_notify_sock_rcu(struct rcu_head
*head
)
199 struct ust_app_notify_sock_obj
*obj
=
200 caa_container_of(head
, struct ust_app_notify_sock_obj
, head
);
202 /* Must have a valid fd here. */
203 assert(obj
->fd
>= 0);
205 ret
= close(obj
->fd
);
207 ERR("close notify sock %d RCU", obj
->fd
);
209 lttng_fd_put(LTTNG_FD_APPS
, 1);
215 * Return the session registry according to the buffer type of the given
218 * A registry per UID object MUST exists before calling this function or else
219 * it assert() if not found. RCU read side lock must be acquired.
221 static struct ust_registry_session
*get_session_registry(
222 struct ust_app_session
*ua_sess
)
224 struct ust_registry_session
*registry
= NULL
;
228 switch (ua_sess
->buffer_type
) {
229 case LTTNG_BUFFER_PER_PID
:
231 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
235 registry
= reg_pid
->registry
->reg
.ust
;
238 case LTTNG_BUFFER_PER_UID
:
240 struct buffer_reg_uid
*reg_uid
= buffer_reg_uid_find(
241 ua_sess
->tracing_id
, ua_sess
->bits_per_long
, ua_sess
->uid
);
245 registry
= reg_uid
->registry
->reg
.ust
;
257 * Delete ust context safely. RCU read lock must be held before calling
261 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
268 ret
= ustctl_release_object(sock
, ua_ctx
->obj
);
269 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
270 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
271 sock
, ua_ctx
->obj
->handle
, ret
);
279 * Delete ust app event safely. RCU read lock must be held before calling
283 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
289 free(ua_event
->filter
);
290 if (ua_event
->exclusion
!= NULL
)
291 free(ua_event
->exclusion
);
292 if (ua_event
->obj
!= NULL
) {
293 ret
= ustctl_release_object(sock
, ua_event
->obj
);
294 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
295 ERR("UST app sock %d release event obj failed with ret %d",
304 * Release ust data object of the given stream.
306 * Return 0 on success or else a negative value.
308 static int release_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
315 ret
= ustctl_release_object(sock
, stream
->obj
);
316 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
317 ERR("UST app sock %d release stream obj failed with ret %d",
320 lttng_fd_put(LTTNG_FD_APPS
, 2);
328 * Delete ust app stream safely. RCU read lock must be held before calling
332 void delete_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
336 (void) release_ust_app_stream(sock
, stream
);
341 * We need to execute ht_destroy outside of RCU read-side critical
342 * section and outside of call_rcu thread, so we postpone its execution
343 * using ht_cleanup_push. It is simpler than to change the semantic of
344 * the many callers of delete_ust_app_session().
347 void delete_ust_app_channel_rcu(struct rcu_head
*head
)
349 struct ust_app_channel
*ua_chan
=
350 caa_container_of(head
, struct ust_app_channel
, rcu_head
);
352 ht_cleanup_push(ua_chan
->ctx
);
353 ht_cleanup_push(ua_chan
->events
);
358 * Delete ust app channel safely. RCU read lock must be held before calling
362 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
,
366 struct lttng_ht_iter iter
;
367 struct ust_app_event
*ua_event
;
368 struct ust_app_ctx
*ua_ctx
;
369 struct ust_app_stream
*stream
, *stmp
;
370 struct ust_registry_session
*registry
;
374 DBG3("UST app deleting channel %s", ua_chan
->name
);
377 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
378 cds_list_del(&stream
->list
);
379 delete_ust_app_stream(sock
, stream
);
383 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
384 cds_list_del(&ua_ctx
->list
);
385 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
387 delete_ust_app_ctx(sock
, ua_ctx
);
391 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
393 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
395 delete_ust_app_event(sock
, ua_event
);
398 if (ua_chan
->session
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
399 /* Wipe and free registry from session registry. */
400 registry
= get_session_registry(ua_chan
->session
);
402 ust_registry_channel_del_free(registry
, ua_chan
->key
);
406 if (ua_chan
->obj
!= NULL
) {
407 /* Remove channel from application UST object descriptor. */
408 iter
.iter
.node
= &ua_chan
->ust_objd_node
.node
;
409 ret
= lttng_ht_del(app
->ust_objd
, &iter
);
411 ret
= ustctl_release_object(sock
, ua_chan
->obj
);
412 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
413 ERR("UST app sock %d release channel obj failed with ret %d",
416 lttng_fd_put(LTTNG_FD_APPS
, 1);
419 call_rcu(&ua_chan
->rcu_head
, delete_ust_app_channel_rcu
);
423 * Push metadata to consumer socket.
425 * The socket lock MUST be acquired.
426 * The ust app session lock MUST be acquired.
428 * On success, return the len of metadata pushed or else a negative value.
430 ssize_t
ust_app_push_metadata(struct ust_registry_session
*registry
,
431 struct consumer_socket
*socket
, int send_zero_data
)
434 char *metadata_str
= NULL
;
442 * On a push metadata error either the consumer is dead or the metadata
443 * channel has been destroyed because its endpoint might have died (e.g:
444 * relayd). If so, the metadata closed flag is set to 1 so we deny pushing
445 * metadata again which is not valid anymore on the consumer side.
447 * The ust app session mutex locked allows us to make this check without
450 if (registry
->metadata_closed
) {
454 pthread_mutex_lock(®istry
->lock
);
456 offset
= registry
->metadata_len_sent
;
457 len
= registry
->metadata_len
- registry
->metadata_len_sent
;
459 DBG3("No metadata to push for metadata key %" PRIu64
,
460 registry
->metadata_key
);
462 if (send_zero_data
) {
463 DBG("No metadata to push");
469 /* Allocate only what we have to send. */
470 metadata_str
= zmalloc(len
);
472 PERROR("zmalloc ust app metadata string");
476 /* Copy what we haven't send out. */
477 memcpy(metadata_str
, registry
->metadata
+ offset
, len
);
478 registry
->metadata_len_sent
+= len
;
481 pthread_mutex_unlock(®istry
->lock
);
482 ret
= consumer_push_metadata(socket
, registry
->metadata_key
,
483 metadata_str
, len
, offset
);
486 * There is an acceptable race here between the registry metadata key
487 * assignment and the creation on the consumer. The session daemon can
488 * concurrently push metadata for this registry while being created on
489 * the consumer since the metadata key of the registry is assigned
490 * *before* it is setup to avoid the consumer to ask for metadata that
491 * could possibly be not found in the session daemon.
493 * The metadata will get pushed either by the session being stopped or
494 * the consumer requesting metadata if that race is triggered.
496 if (ret
== -LTTCOMM_CONSUMERD_CHANNEL_FAIL
) {
500 /* Update back the actual metadata len sent since it failed here. */
501 pthread_mutex_lock(®istry
->lock
);
502 registry
->metadata_len_sent
-= len
;
503 pthread_mutex_unlock(®istry
->lock
);
513 pthread_mutex_unlock(®istry
->lock
);
520 * For a given application and session, push metadata to consumer. The session
521 * lock MUST be acquired here before calling this.
522 * Either sock or consumer is required : if sock is NULL, the default
523 * socket to send the metadata is retrieved from consumer, if sock
524 * is not NULL we use it to send the metadata.
526 * Return 0 on success else a negative error.
528 static int push_metadata(struct ust_registry_session
*registry
,
529 struct consumer_output
*consumer
)
533 struct consumer_socket
*socket
;
541 * Means that no metadata was assigned to the session. This can happens if
542 * no start has been done previously.
544 if (!registry
->metadata_key
) {
549 /* Get consumer socket to use to push the metadata.*/
550 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
554 goto error_rcu_unlock
;
558 * TODO: Currently, we hold the socket lock around sampling of the next
559 * metadata segment to ensure we send metadata over the consumer socket in
560 * the correct order. This makes the registry lock nest inside the socket
563 * Please note that this is a temporary measure: we should move this lock
564 * back into ust_consumer_push_metadata() when the consumer gets the
565 * ability to reorder the metadata it receives.
567 pthread_mutex_lock(socket
->lock
);
568 ret
= ust_app_push_metadata(registry
, socket
, 0);
569 pthread_mutex_unlock(socket
->lock
);
572 goto error_rcu_unlock
;
580 * On error, flag the registry that the metadata is closed. We were unable
581 * to push anything and this means that either the consumer is not
582 * responding or the metadata cache has been destroyed on the consumer.
584 registry
->metadata_closed
= 1;
591 * Send to the consumer a close metadata command for the given session. Once
592 * done, the metadata channel is deleted and the session metadata pointer is
593 * nullified. The session lock MUST be acquired here unless the application is
594 * in the destroy path.
596 * Return 0 on success else a negative value.
598 static int close_metadata(struct ust_registry_session
*registry
,
599 struct consumer_output
*consumer
)
602 struct consumer_socket
*socket
;
609 if (!registry
->metadata_key
|| registry
->metadata_closed
) {
614 /* Get consumer socket to use to push the metadata.*/
615 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
622 ret
= consumer_close_metadata(socket
, registry
->metadata_key
);
629 * Metadata closed. Even on error this means that the consumer is not
630 * responding or not found so either way a second close should NOT be emit
633 registry
->metadata_closed
= 1;
640 * We need to execute ht_destroy outside of RCU read-side critical
641 * section and outside of call_rcu thread, so we postpone its execution
642 * using ht_cleanup_push. It is simpler than to change the semantic of
643 * the many callers of delete_ust_app_session().
646 void delete_ust_app_session_rcu(struct rcu_head
*head
)
648 struct ust_app_session
*ua_sess
=
649 caa_container_of(head
, struct ust_app_session
, rcu_head
);
651 ht_cleanup_push(ua_sess
->channels
);
656 * Delete ust app session safely. RCU read lock must be held before calling
660 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
664 struct lttng_ht_iter iter
;
665 struct ust_app_channel
*ua_chan
;
666 struct ust_registry_session
*registry
;
670 pthread_mutex_lock(&ua_sess
->lock
);
672 registry
= get_session_registry(ua_sess
);
673 if (registry
&& !registry
->metadata_closed
) {
674 /* Push metadata for application before freeing the application. */
675 (void) push_metadata(registry
, ua_sess
->consumer
);
678 * Don't ask to close metadata for global per UID buffers. Close
679 * metadata only on destroy trace session in this case. Also, the
680 * previous push metadata could have flag the metadata registry to
681 * close so don't send a close command if closed.
683 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
&&
684 !registry
->metadata_closed
) {
685 /* And ask to close it for this session registry. */
686 (void) close_metadata(registry
, ua_sess
->consumer
);
690 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
692 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
694 delete_ust_app_channel(sock
, ua_chan
, app
);
697 /* In case of per PID, the registry is kept in the session. */
698 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
699 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
701 buffer_reg_pid_remove(reg_pid
);
702 buffer_reg_pid_destroy(reg_pid
);
706 if (ua_sess
->handle
!= -1) {
707 ret
= ustctl_release_handle(sock
, ua_sess
->handle
);
708 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
709 ERR("UST app sock %d release session handle failed with ret %d",
713 pthread_mutex_unlock(&ua_sess
->lock
);
715 call_rcu(&ua_sess
->rcu_head
, delete_ust_app_session_rcu
);
719 * Delete a traceable application structure from the global list. Never call
720 * this function outside of a call_rcu call.
722 * RCU read side lock should _NOT_ be held when calling this function.
725 void delete_ust_app(struct ust_app
*app
)
728 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
730 /* Delete ust app sessions info */
735 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
737 /* Free every object in the session and the session. */
739 delete_ust_app_session(sock
, ua_sess
, app
);
743 ht_cleanup_push(app
->sessions
);
744 ht_cleanup_push(app
->ust_objd
);
747 * Wait until we have deleted the application from the sock hash table
748 * before closing this socket, otherwise an application could re-use the
749 * socket ID and race with the teardown, using the same hash table entry.
751 * It's OK to leave the close in call_rcu. We want it to stay unique for
752 * all RCU readers that could run concurrently with unregister app,
753 * therefore we _need_ to only close that socket after a grace period. So
754 * it should stay in this RCU callback.
756 * This close() is a very important step of the synchronization model so
757 * every modification to this function must be carefully reviewed.
763 lttng_fd_put(LTTNG_FD_APPS
, 1);
765 DBG2("UST app pid %d deleted", app
->pid
);
770 * URCU intermediate call to delete an UST app.
773 void delete_ust_app_rcu(struct rcu_head
*head
)
775 struct lttng_ht_node_ulong
*node
=
776 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
777 struct ust_app
*app
=
778 caa_container_of(node
, struct ust_app
, pid_n
);
780 DBG3("Call RCU deleting app PID %d", app
->pid
);
785 * Delete the session from the application ht and delete the data structure by
786 * freeing every object inside and releasing them.
788 static void destroy_app_session(struct ust_app
*app
,
789 struct ust_app_session
*ua_sess
)
792 struct lttng_ht_iter iter
;
797 iter
.iter
.node
= &ua_sess
->node
.node
;
798 ret
= lttng_ht_del(app
->sessions
, &iter
);
800 /* Already scheduled for teardown. */
804 /* Once deleted, free the data structure. */
805 delete_ust_app_session(app
->sock
, ua_sess
, app
);
812 * Alloc new UST app session.
815 struct ust_app_session
*alloc_ust_app_session(struct ust_app
*app
)
817 struct ust_app_session
*ua_sess
;
819 /* Init most of the default value by allocating and zeroing */
820 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
821 if (ua_sess
== NULL
) {
826 ua_sess
->handle
= -1;
827 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
828 ua_sess
->metadata_attr
.type
= LTTNG_UST_CHAN_METADATA
;
829 pthread_mutex_init(&ua_sess
->lock
, NULL
);
838 * Alloc new UST app channel.
841 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
842 struct ust_app_session
*ua_sess
,
843 struct lttng_ust_channel_attr
*attr
)
845 struct ust_app_channel
*ua_chan
;
847 /* Init most of the default value by allocating and zeroing */
848 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
849 if (ua_chan
== NULL
) {
854 /* Setup channel name */
855 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
856 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
858 ua_chan
->enabled
= 1;
859 ua_chan
->handle
= -1;
860 ua_chan
->session
= ua_sess
;
861 ua_chan
->key
= get_next_channel_key();
862 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
863 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
864 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
866 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
867 CDS_INIT_LIST_HEAD(&ua_chan
->ctx_list
);
869 /* Copy attributes */
871 /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */
872 ua_chan
->attr
.subbuf_size
= attr
->subbuf_size
;
873 ua_chan
->attr
.num_subbuf
= attr
->num_subbuf
;
874 ua_chan
->attr
.overwrite
= attr
->overwrite
;
875 ua_chan
->attr
.switch_timer_interval
= attr
->switch_timer_interval
;
876 ua_chan
->attr
.read_timer_interval
= attr
->read_timer_interval
;
877 ua_chan
->attr
.output
= attr
->output
;
879 /* By default, the channel is a per cpu channel. */
880 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
882 DBG3("UST app channel %s allocated", ua_chan
->name
);
891 * Allocate and initialize a UST app stream.
893 * Return newly allocated stream pointer or NULL on error.
895 struct ust_app_stream
*ust_app_alloc_stream(void)
897 struct ust_app_stream
*stream
= NULL
;
899 stream
= zmalloc(sizeof(*stream
));
900 if (stream
== NULL
) {
901 PERROR("zmalloc ust app stream");
905 /* Zero could be a valid value for a handle so flag it to -1. */
913 * Alloc new UST app event.
916 struct ust_app_event
*alloc_ust_app_event(char *name
,
917 struct lttng_ust_event
*attr
)
919 struct ust_app_event
*ua_event
;
921 /* Init most of the default value by allocating and zeroing */
922 ua_event
= zmalloc(sizeof(struct ust_app_event
));
923 if (ua_event
== NULL
) {
928 ua_event
->enabled
= 1;
929 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
930 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
931 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
933 /* Copy attributes */
935 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
938 DBG3("UST app event %s allocated", ua_event
->name
);
947 * Alloc new UST app context.
950 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
952 struct ust_app_ctx
*ua_ctx
;
954 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
955 if (ua_ctx
== NULL
) {
959 CDS_INIT_LIST_HEAD(&ua_ctx
->list
);
962 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
965 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
972 * Allocate a filter and copy the given original filter.
974 * Return allocated filter or NULL on error.
976 static struct lttng_ust_filter_bytecode
*alloc_copy_ust_app_filter(
977 struct lttng_ust_filter_bytecode
*orig_f
)
979 struct lttng_ust_filter_bytecode
*filter
= NULL
;
981 /* Copy filter bytecode */
982 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
984 PERROR("zmalloc alloc ust app filter");
988 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
995 * Find an ust_app using the sock and return it. RCU read side lock must be
996 * held before calling this helper function.
998 struct ust_app
*ust_app_find_by_sock(int sock
)
1000 struct lttng_ht_node_ulong
*node
;
1001 struct lttng_ht_iter iter
;
1003 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1004 node
= lttng_ht_iter_get_node_ulong(&iter
);
1006 DBG2("UST app find by sock %d not found", sock
);
1010 return caa_container_of(node
, struct ust_app
, sock_n
);
1017 * Find an ust_app using the notify sock and return it. RCU read side lock must
1018 * be held before calling this helper function.
1020 static struct ust_app
*find_app_by_notify_sock(int sock
)
1022 struct lttng_ht_node_ulong
*node
;
1023 struct lttng_ht_iter iter
;
1025 lttng_ht_lookup(ust_app_ht_by_notify_sock
, (void *)((unsigned long) sock
),
1027 node
= lttng_ht_iter_get_node_ulong(&iter
);
1029 DBG2("UST app find by notify sock %d not found", sock
);
1033 return caa_container_of(node
, struct ust_app
, notify_sock_n
);
1040 * Lookup for an ust app event based on event name, filter bytecode and the
1043 * Return an ust_app_event object or NULL on error.
1045 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
1046 char *name
, struct lttng_ust_filter_bytecode
*filter
, int loglevel
,
1047 const struct lttng_event_exclusion
*exclusion
)
1049 struct lttng_ht_iter iter
;
1050 struct lttng_ht_node_str
*node
;
1051 struct ust_app_event
*event
= NULL
;
1052 struct ust_app_ht_key key
;
1057 /* Setup key for event lookup. */
1059 key
.filter
= filter
;
1060 key
.loglevel
= loglevel
;
1061 /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */
1062 key
.exclusion
= (struct lttng_ust_event_exclusion
*)exclusion
;
1064 /* Lookup using the event name as hash and a custom match fct. */
1065 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
1066 ht_match_ust_app_event
, &key
, &iter
.iter
);
1067 node
= lttng_ht_iter_get_node_str(&iter
);
1072 event
= caa_container_of(node
, struct ust_app_event
, node
);
1079 * Create the channel context on the tracer.
1081 * Called with UST app session lock held.
1084 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
1085 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
1089 health_code_update();
1091 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
1092 ua_chan
->obj
, &ua_ctx
->obj
);
1094 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1095 ERR("UST app create channel context failed for app (pid: %d) "
1096 "with ret %d", app
->pid
, ret
);
1099 * This is normal behavior, an application can die during the
1100 * creation process. Don't report an error so the execution can
1101 * continue normally.
1104 DBG3("UST app disable event failed. Application is dead.");
1109 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
1111 DBG2("UST app context handle %d created successfully for channel %s",
1112 ua_ctx
->handle
, ua_chan
->name
);
1115 health_code_update();
1120 * Set the filter on the tracer.
1123 int set_ust_event_filter(struct ust_app_event
*ua_event
,
1124 struct ust_app
*app
)
1128 health_code_update();
1130 if (!ua_event
->filter
) {
1135 ret
= ustctl_set_filter(app
->sock
, ua_event
->filter
,
1138 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1139 ERR("UST app event %s filter failed for app (pid: %d) "
1140 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1143 * This is normal behavior, an application can die during the
1144 * creation process. Don't report an error so the execution can
1145 * continue normally.
1148 DBG3("UST app filter event failed. Application is dead.");
1153 DBG2("UST filter set successfully for event %s", ua_event
->name
);
1156 health_code_update();
1161 * Set event exclusions on the tracer.
1164 int set_ust_event_exclusion(struct ust_app_event
*ua_event
,
1165 struct ust_app
*app
)
1169 health_code_update();
1171 if (!ua_event
->exclusion
|| !ua_event
->exclusion
->count
) {
1176 ret
= ustctl_set_exclusion(app
->sock
, ua_event
->exclusion
,
1179 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1180 ERR("UST app event %s exclusions failed for app (pid: %d) "
1181 "with ret %d", ua_event
->attr
.name
, app
->pid
, ret
);
1184 * This is normal behavior, an application can die during the
1185 * creation process. Don't report an error so the execution can
1186 * continue normally.
1189 DBG3("UST app event exclusion failed. Application is dead.");
1194 DBG2("UST exclusion set successfully for event %s", ua_event
->name
);
1197 health_code_update();
1202 * Disable the specified event on to UST tracer for the UST session.
1204 static int disable_ust_event(struct ust_app
*app
,
1205 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1209 health_code_update();
1211 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
1213 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1214 ERR("UST app event %s disable failed for app (pid: %d) "
1215 "and session handle %d with ret %d",
1216 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1219 * This is normal behavior, an application can die during the
1220 * creation process. Don't report an error so the execution can
1221 * continue normally.
1224 DBG3("UST app disable event failed. Application is dead.");
1229 DBG2("UST app event %s disabled successfully for app (pid: %d)",
1230 ua_event
->attr
.name
, app
->pid
);
1233 health_code_update();
1238 * Disable the specified channel on to UST tracer for the UST session.
1240 static int disable_ust_channel(struct ust_app
*app
,
1241 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1245 health_code_update();
1247 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
1249 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1250 ERR("UST app channel %s disable failed for app (pid: %d) "
1251 "and session handle %d with ret %d",
1252 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1255 * This is normal behavior, an application can die during the
1256 * creation process. Don't report an error so the execution can
1257 * continue normally.
1260 DBG3("UST app disable channel failed. Application is dead.");
1265 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
1266 ua_chan
->name
, app
->pid
);
1269 health_code_update();
1274 * Enable the specified channel on to UST tracer for the UST session.
1276 static int enable_ust_channel(struct ust_app
*app
,
1277 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1281 health_code_update();
1283 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
1285 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1286 ERR("UST app channel %s enable failed for app (pid: %d) "
1287 "and session handle %d with ret %d",
1288 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
1291 * This is normal behavior, an application can die during the
1292 * creation process. Don't report an error so the execution can
1293 * continue normally.
1296 DBG3("UST app enable channel failed. Application is dead.");
1301 ua_chan
->enabled
= 1;
1303 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
1304 ua_chan
->name
, app
->pid
);
1307 health_code_update();
1312 * Enable the specified event on to UST tracer for the UST session.
1314 static int enable_ust_event(struct ust_app
*app
,
1315 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
1319 health_code_update();
1321 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
1323 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1324 ERR("UST app event %s enable failed for app (pid: %d) "
1325 "and session handle %d with ret %d",
1326 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
1329 * This is normal behavior, an application can die during the
1330 * creation process. Don't report an error so the execution can
1331 * continue normally.
1334 DBG3("UST app enable event failed. Application is dead.");
1339 DBG2("UST app event %s enabled successfully for app (pid: %d)",
1340 ua_event
->attr
.name
, app
->pid
);
1343 health_code_update();
1348 * Send channel and stream buffer to application.
1350 * Return 0 on success. On error, a negative value is returned.
1352 static int send_channel_pid_to_ust(struct ust_app
*app
,
1353 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
1356 struct ust_app_stream
*stream
, *stmp
;
1362 health_code_update();
1364 DBG("UST app sending channel %s to UST app sock %d", ua_chan
->name
,
1367 /* Send channel to the application. */
1368 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
1373 health_code_update();
1375 /* Send all streams to application. */
1376 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
1377 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, stream
);
1381 /* We don't need the stream anymore once sent to the tracer. */
1382 cds_list_del(&stream
->list
);
1383 delete_ust_app_stream(-1, stream
);
1385 /* Flag the channel that it is sent to the application. */
1386 ua_chan
->is_sent
= 1;
1389 health_code_update();
1394 * Create the specified event onto the UST tracer for a UST session.
1396 * Should be called with session mutex held.
1399 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
1400 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
1404 health_code_update();
1406 /* Create UST event on tracer */
1407 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
1410 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1411 ERR("Error ustctl create event %s for app pid: %d with ret %d",
1412 ua_event
->attr
.name
, app
->pid
, ret
);
1415 * This is normal behavior, an application can die during the
1416 * creation process. Don't report an error so the execution can
1417 * continue normally.
1420 DBG3("UST app create event failed. Application is dead.");
1425 ua_event
->handle
= ua_event
->obj
->handle
;
1427 DBG2("UST app event %s created successfully for pid:%d",
1428 ua_event
->attr
.name
, app
->pid
);
1430 health_code_update();
1432 /* Set filter if one is present. */
1433 if (ua_event
->filter
) {
1434 ret
= set_ust_event_filter(ua_event
, app
);
1440 /* Set exclusions for the event */
1441 if (ua_event
->exclusion
) {
1442 ret
= set_ust_event_exclusion(ua_event
, app
);
1448 /* If event not enabled, disable it on the tracer */
1449 if (ua_event
->enabled
) {
1451 * We now need to explicitly enable the event, since it
1452 * is now disabled at creation.
1454 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1457 * If we hit an EPERM, something is wrong with our enable call. If
1458 * we get an EEXIST, there is a problem on the tracer side since we
1462 case -LTTNG_UST_ERR_PERM
:
1463 /* Code flow problem */
1465 case -LTTNG_UST_ERR_EXIST
:
1466 /* It's OK for our use case. */
1477 health_code_update();
1482 * Copy data between an UST app event and a LTT event.
1484 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1485 struct ltt_ust_event
*uevent
)
1487 size_t exclusion_alloc_size
;
1489 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1490 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1492 ua_event
->enabled
= uevent
->enabled
;
1494 /* Copy event attributes */
1495 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1497 /* Copy filter bytecode */
1498 if (uevent
->filter
) {
1499 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
1500 /* Filter might be NULL here in case of ENONEM. */
1503 /* Copy exclusion data */
1504 if (uevent
->exclusion
) {
1505 exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1506 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1507 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1508 if (ua_event
->exclusion
== NULL
) {
1511 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1512 exclusion_alloc_size
);
1518 * Copy data between an UST app channel and a LTT channel.
1520 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1521 struct ltt_ust_channel
*uchan
)
1523 struct lttng_ht_iter iter
;
1524 struct ltt_ust_event
*uevent
;
1525 struct ltt_ust_context
*uctx
;
1526 struct ust_app_event
*ua_event
;
1527 struct ust_app_ctx
*ua_ctx
;
1529 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1531 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1532 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1534 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1535 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1537 /* Copy event attributes since the layout is different. */
1538 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1539 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1540 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1541 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1542 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1543 ua_chan
->attr
.output
= uchan
->attr
.output
;
1545 * Note that the attribute channel type is not set since the channel on the
1546 * tracing registry side does not have this information.
1549 ua_chan
->enabled
= uchan
->enabled
;
1550 ua_chan
->tracing_channel_id
= uchan
->id
;
1552 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
1553 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
1554 if (ua_ctx
== NULL
) {
1557 lttng_ht_node_init_ulong(&ua_ctx
->node
,
1558 (unsigned long) ua_ctx
->ctx
.ctx
);
1559 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1560 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
1563 /* Copy all events from ltt ust channel to ust app channel */
1564 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
1565 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1566 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
1567 if (ua_event
== NULL
) {
1568 DBG2("UST event %s not found on shadow copy channel",
1570 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1571 if (ua_event
== NULL
) {
1574 shadow_copy_event(ua_event
, uevent
);
1575 add_unique_ust_app_event(ua_chan
, ua_event
);
1579 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1583 * Copy data between a UST app session and a regular LTT session.
1585 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1586 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1588 struct lttng_ht_node_str
*ua_chan_node
;
1589 struct lttng_ht_iter iter
;
1590 struct ltt_ust_channel
*uchan
;
1591 struct ust_app_channel
*ua_chan
;
1593 struct tm
*timeinfo
;
1597 /* Get date and time for unique app path */
1599 timeinfo
= localtime(&rawtime
);
1600 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1602 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1604 ua_sess
->tracing_id
= usess
->id
;
1605 ua_sess
->id
= get_next_session_id();
1606 ua_sess
->uid
= app
->uid
;
1607 ua_sess
->gid
= app
->gid
;
1608 ua_sess
->euid
= usess
->uid
;
1609 ua_sess
->egid
= usess
->gid
;
1610 ua_sess
->buffer_type
= usess
->buffer_type
;
1611 ua_sess
->bits_per_long
= app
->bits_per_long
;
1612 /* There is only one consumer object per session possible. */
1613 ua_sess
->consumer
= usess
->consumer
;
1614 ua_sess
->output_traces
= usess
->output_traces
;
1615 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1616 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1617 &usess
->metadata_attr
);
1619 switch (ua_sess
->buffer_type
) {
1620 case LTTNG_BUFFER_PER_PID
:
1621 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1622 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1625 case LTTNG_BUFFER_PER_UID
:
1626 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1627 DEFAULT_UST_TRACE_UID_PATH
, ua_sess
->uid
, app
->bits_per_long
);
1634 PERROR("asprintf UST shadow copy session");
1639 /* Iterate over all channels in global domain. */
1640 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1642 struct lttng_ht_iter uiter
;
1644 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1645 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1646 if (ua_chan_node
!= NULL
) {
1647 /* Session exist. Contiuing. */
1651 DBG2("Channel %s not found on shadow session copy, creating it",
1653 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
1654 if (ua_chan
== NULL
) {
1655 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1658 shadow_copy_channel(ua_chan
, uchan
);
1660 * The concept of metadata channel does not exist on the tracing
1661 * registry side of the session daemon so this can only be a per CPU
1662 * channel and not metadata.
1664 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1666 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1674 * Lookup sesison wrapper.
1677 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1678 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1680 /* Get right UST app session from app */
1681 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
1685 * Return ust app session from the app session hashtable using the UST session
1688 static struct ust_app_session
*lookup_session_by_app(
1689 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1691 struct lttng_ht_iter iter
;
1692 struct lttng_ht_node_u64
*node
;
1694 __lookup_session_by_app(usess
, app
, &iter
);
1695 node
= lttng_ht_iter_get_node_u64(&iter
);
1700 return caa_container_of(node
, struct ust_app_session
, node
);
1707 * Setup buffer registry per PID for the given session and application. If none
1708 * is found, a new one is created, added to the global registry and
1709 * initialized. If regp is valid, it's set with the newly created object.
1711 * Return 0 on success or else a negative value.
1713 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
1714 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
1717 struct buffer_reg_pid
*reg_pid
;
1724 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
1727 * This is the create channel path meaning that if there is NO
1728 * registry available, we have to create one for this session.
1730 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
);
1734 buffer_reg_pid_add(reg_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
);
1750 DBG3("UST app buffer registry per PID created successfully");
1762 * Setup buffer registry per UID for the given session and application. If none
1763 * is found, a new one is created, added to the global registry and
1764 * initialized. If regp is valid, it's set with the newly created object.
1766 * Return 0 on success or else a negative value.
1768 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
1769 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
1772 struct buffer_reg_uid
*reg_uid
;
1779 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
1782 * This is the create channel path meaning that if there is NO
1783 * registry available, we have to create one for this session.
1785 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
1786 LTTNG_DOMAIN_UST
, ®_uid
);
1790 buffer_reg_uid_add(reg_uid
);
1795 /* Initialize registry. */
1796 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
1797 app
->bits_per_long
, app
->uint8_t_alignment
,
1798 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1799 app
->uint64_t_alignment
, app
->long_alignment
,
1800 app
->byte_order
, app
->version
.major
,
1801 app
->version
.minor
);
1805 /* Add node to teardown list of the session. */
1806 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
1808 DBG3("UST app buffer registry per UID created successfully");
1820 * Create a session on the tracer side for the given app.
1822 * On success, ua_sess_ptr is populated with the session pointer or else left
1823 * untouched. If the session was created, is_created is set to 1. On error,
1824 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1827 * Returns 0 on success or else a negative code which is either -ENOMEM or
1828 * -ENOTCONN which is the default code if the ustctl_create_session fails.
1830 static int create_ust_app_session(struct ltt_ust_session
*usess
,
1831 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
1834 int ret
, created
= 0;
1835 struct ust_app_session
*ua_sess
;
1839 assert(ua_sess_ptr
);
1841 health_code_update();
1843 ua_sess
= lookup_session_by_app(usess
, app
);
1844 if (ua_sess
== NULL
) {
1845 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
1846 app
->pid
, usess
->id
);
1847 ua_sess
= alloc_ust_app_session(app
);
1848 if (ua_sess
== NULL
) {
1849 /* Only malloc can failed so something is really wrong */
1853 shadow_copy_session(ua_sess
, usess
, app
);
1857 switch (usess
->buffer_type
) {
1858 case LTTNG_BUFFER_PER_PID
:
1859 /* Init local registry. */
1860 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
1865 case LTTNG_BUFFER_PER_UID
:
1866 /* Look for a global registry. If none exists, create one. */
1867 ret
= setup_buffer_reg_uid(usess
, app
, NULL
);
1878 health_code_update();
1880 if (ua_sess
->handle
== -1) {
1881 ret
= ustctl_create_session(app
->sock
);
1883 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1884 ERR("Creating session for app pid %d with ret %d",
1887 DBG("UST app creating session failed. Application is dead");
1889 * This is normal behavior, an application can die during the
1890 * creation process. Don't report an error so the execution can
1891 * continue normally. This will get flagged ENOTCONN and the
1892 * caller will handle it.
1896 delete_ust_app_session(-1, ua_sess
, app
);
1897 if (ret
!= -ENOMEM
) {
1899 * Tracer is probably gone or got an internal error so let's
1900 * behave like it will soon unregister or not usable.
1907 ua_sess
->handle
= ret
;
1909 /* Add ust app session to app's HT */
1910 lttng_ht_node_init_u64(&ua_sess
->node
,
1911 ua_sess
->tracing_id
);
1912 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
1914 DBG2("UST app session created successfully with handle %d", ret
);
1917 *ua_sess_ptr
= ua_sess
;
1919 *is_created
= created
;
1922 /* Everything went well. */
1926 health_code_update();
1931 * Match function for a hash table lookup of ust_app_ctx.
1933 * It matches an ust app context based on the context type and, in the case
1934 * of perf counters, their name.
1936 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
1938 struct ust_app_ctx
*ctx
;
1939 const struct lttng_ust_context
*key
;
1944 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
1948 if (ctx
->ctx
.ctx
!= key
->ctx
) {
1952 /* Check the name in the case of perf thread counters. */
1953 if (key
->ctx
== LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
) {
1954 if (strncmp(key
->u
.perf_counter
.name
,
1955 ctx
->ctx
.u
.perf_counter
.name
,
1956 sizeof(key
->u
.perf_counter
.name
))) {
1969 * Lookup for an ust app context from an lttng_ust_context.
1971 * Return an ust_app_ctx object or NULL on error.
1974 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
1975 struct lttng_ust_context
*uctx
)
1977 struct lttng_ht_iter iter
;
1978 struct lttng_ht_node_ulong
*node
;
1979 struct ust_app_ctx
*app_ctx
= NULL
;
1984 /* Lookup using the lttng_ust_context_type and a custom match fct. */
1985 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
1986 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
1987 node
= lttng_ht_iter_get_node_ulong(&iter
);
1992 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
1999 * Create a context for the channel on the tracer.
2001 * Called with UST app session lock held and a RCU read side lock.
2004 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
2005 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
2006 struct ust_app
*app
)
2009 struct ust_app_ctx
*ua_ctx
;
2011 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2013 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2019 ua_ctx
= alloc_ust_app_ctx(uctx
);
2020 if (ua_ctx
== NULL
) {
2026 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2027 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2028 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2030 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2040 * Enable on the tracer side a ust app event for the session and channel.
2042 * Called with UST app session lock held.
2045 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2046 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2050 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2055 ua_event
->enabled
= 1;
2062 * Disable on the tracer side a ust app event for the session and channel.
2064 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2065 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2069 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2074 ua_event
->enabled
= 0;
2081 * Lookup ust app channel for session and disable it on the tracer side.
2084 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2085 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2089 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2094 ua_chan
->enabled
= 0;
2101 * Lookup ust app channel for session and enable it on the tracer side. This
2102 * MUST be called with a RCU read side lock acquired.
2104 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2105 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2108 struct lttng_ht_iter iter
;
2109 struct lttng_ht_node_str
*ua_chan_node
;
2110 struct ust_app_channel
*ua_chan
;
2112 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2113 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2114 if (ua_chan_node
== NULL
) {
2115 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2116 uchan
->name
, ua_sess
->tracing_id
);
2120 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2122 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2132 * Ask the consumer to create a channel and get it if successful.
2134 * Return 0 on success or else a negative value.
2136 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2137 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2138 int bitness
, struct ust_registry_session
*registry
)
2141 unsigned int nb_fd
= 0;
2142 struct consumer_socket
*socket
;
2150 health_code_update();
2152 /* Get the right consumer socket for the application. */
2153 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2159 health_code_update();
2161 /* Need one fd for the channel. */
2162 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2164 ERR("Exhausted number of available FD upon create channel");
2169 * Ask consumer to create channel. The consumer will return the number of
2170 * stream we have to expect.
2172 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2179 * Compute the number of fd needed before receiving them. It must be 2 per
2180 * stream (2 being the default value here).
2182 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2184 /* Reserve the amount of file descriptor we need. */
2185 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2187 ERR("Exhausted number of available FD upon create channel");
2188 goto error_fd_get_stream
;
2191 health_code_update();
2194 * Now get the channel from the consumer. This call wil populate the stream
2195 * list of that channel and set the ust objects.
2197 if (usess
->consumer
->enabled
) {
2198 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2208 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2209 error_fd_get_stream
:
2211 * Initiate a destroy channel on the consumer since we had an error
2212 * handling it on our side. The return value is of no importance since we
2213 * already have a ret value set by the previous error that we need to
2216 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2218 lttng_fd_put(LTTNG_FD_APPS
, 1);
2220 health_code_update();
2226 * Duplicate the ust data object of the ust app stream and save it in the
2227 * buffer registry stream.
2229 * Return 0 on success or else a negative value.
2231 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2232 struct ust_app_stream
*stream
)
2239 /* Reserve the amount of file descriptor we need. */
2240 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2242 ERR("Exhausted number of available FD upon duplicate stream");
2246 /* Duplicate object for stream once the original is in the registry. */
2247 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2248 reg_stream
->obj
.ust
);
2250 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2251 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2252 lttng_fd_put(LTTNG_FD_APPS
, 2);
2255 stream
->handle
= stream
->obj
->handle
;
2262 * Duplicate the ust data object of the ust app. channel and save it in the
2263 * buffer registry channel.
2265 * Return 0 on success or else a negative value.
2267 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2268 struct ust_app_channel
*ua_chan
)
2275 /* Need two fds for the channel. */
2276 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2278 ERR("Exhausted number of available FD upon duplicate channel");
2282 /* Duplicate object for stream once the original is in the registry. */
2283 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2285 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2286 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2289 ua_chan
->handle
= ua_chan
->obj
->handle
;
2294 lttng_fd_put(LTTNG_FD_APPS
, 1);
2300 * For a given channel buffer registry, setup all streams of the given ust
2301 * application channel.
2303 * Return 0 on success or else a negative value.
2305 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2306 struct ust_app_channel
*ua_chan
)
2309 struct ust_app_stream
*stream
, *stmp
;
2314 DBG2("UST app setup buffer registry stream");
2316 /* Send all streams to application. */
2317 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2318 struct buffer_reg_stream
*reg_stream
;
2320 ret
= buffer_reg_stream_create(®_stream
);
2326 * Keep original pointer and nullify it in the stream so the delete
2327 * stream call does not release the object.
2329 reg_stream
->obj
.ust
= stream
->obj
;
2331 buffer_reg_stream_add(reg_stream
, reg_chan
);
2333 /* We don't need the streams anymore. */
2334 cds_list_del(&stream
->list
);
2335 delete_ust_app_stream(-1, stream
);
2343 * Create a buffer registry channel for the given session registry and
2344 * application channel object. If regp pointer is valid, it's set with the
2345 * created object. Important, the created object is NOT added to the session
2346 * registry hash table.
2348 * Return 0 on success else a negative value.
2350 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2351 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2354 struct buffer_reg_channel
*reg_chan
= NULL
;
2359 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2361 /* Create buffer registry channel. */
2362 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2367 reg_chan
->consumer_key
= ua_chan
->key
;
2368 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2370 /* Create and add a channel registry to session. */
2371 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2372 ua_chan
->tracing_channel_id
);
2376 buffer_reg_channel_add(reg_sess
, reg_chan
);
2385 /* Safe because the registry channel object was not added to any HT. */
2386 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2392 * Setup buffer registry channel for the given session registry and application
2393 * channel object. If regp pointer is valid, it's set with the created object.
2395 * Return 0 on success else a negative value.
2397 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2398 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
)
2405 assert(ua_chan
->obj
);
2407 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2409 /* Setup all streams for the registry. */
2410 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
);
2415 reg_chan
->obj
.ust
= ua_chan
->obj
;
2416 ua_chan
->obj
= NULL
;
2421 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2422 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2427 * Send buffer registry channel to the application.
2429 * Return 0 on success else a negative value.
2431 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2432 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2433 struct ust_app_channel
*ua_chan
)
2436 struct buffer_reg_stream
*reg_stream
;
2443 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2445 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2450 /* Send channel to the application. */
2451 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2456 health_code_update();
2458 /* Send all streams to application. */
2459 pthread_mutex_lock(®_chan
->stream_list_lock
);
2460 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2461 struct ust_app_stream stream
;
2463 ret
= duplicate_stream_object(reg_stream
, &stream
);
2465 goto error_stream_unlock
;
2468 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2470 (void) release_ust_app_stream(-1, &stream
);
2471 goto error_stream_unlock
;
2475 * The return value is not important here. This function will output an
2478 (void) release_ust_app_stream(-1, &stream
);
2480 ua_chan
->is_sent
= 1;
2482 error_stream_unlock
:
2483 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2489 * Create and send to the application the created buffers with per UID buffers.
2491 * Return 0 on success else a negative value.
2493 static int create_channel_per_uid(struct ust_app
*app
,
2494 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2495 struct ust_app_channel
*ua_chan
)
2498 struct buffer_reg_uid
*reg_uid
;
2499 struct buffer_reg_channel
*reg_chan
;
2506 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2508 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2510 * The session creation handles the creation of this global registry
2511 * object. If none can be find, there is a code flow problem or a
2516 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2519 /* Create the buffer registry channel object. */
2520 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2522 ERR("Error creating the UST channel \"%s\" registry instance",
2529 * Create the buffers on the consumer side. This call populates the
2530 * ust app channel object with all streams and data object.
2532 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2533 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
);
2535 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2539 * Let's remove the previously created buffer registry channel so
2540 * it's not visible anymore in the session registry.
2542 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2543 ua_chan
->tracing_channel_id
);
2544 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2545 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2550 * Setup the streams and add it to the session registry.
2552 ret
= setup_buffer_reg_channel(reg_uid
->registry
, ua_chan
, reg_chan
);
2554 ERR("Error setting up UST channel \"%s\"",
2561 /* Send buffers to the application. */
2562 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2565 * Don't report error to the console, since it may be
2566 * caused by application concurrently exiting.
2576 * Create and send to the application the created buffers with per PID buffers.
2578 * Return 0 on success else a negative value.
2580 static int create_channel_per_pid(struct ust_app
*app
,
2581 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2582 struct ust_app_channel
*ua_chan
)
2585 struct ust_registry_session
*registry
;
2592 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
2596 registry
= get_session_registry(ua_sess
);
2599 /* Create and add a new channel registry to session. */
2600 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
2602 ERR("Error creating the UST channel \"%s\" registry instance",
2607 /* Create and get channel on the consumer side. */
2608 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2609 app
->bits_per_long
, registry
);
2611 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2616 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
2619 * Don't report error to the console, since it may be
2620 * caused by application concurrently exiting.
2631 * From an already allocated ust app channel, create the channel buffers if
2632 * need and send it to the application. This MUST be called with a RCU read
2633 * side lock acquired.
2635 * Return 0 on success or else a negative value.
2637 static int do_create_channel(struct ust_app
*app
,
2638 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2639 struct ust_app_channel
*ua_chan
)
2648 /* Handle buffer type before sending the channel to the application. */
2649 switch (usess
->buffer_type
) {
2650 case LTTNG_BUFFER_PER_UID
:
2652 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
2658 case LTTNG_BUFFER_PER_PID
:
2660 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
2672 /* Initialize ust objd object using the received handle and add it. */
2673 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
2674 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
2676 /* If channel is not enabled, disable it on the tracer */
2677 if (!ua_chan
->enabled
) {
2678 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2689 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2690 * newly created channel if not NULL.
2692 * Called with UST app session lock and RCU read-side lock held.
2694 * Return 0 on success or else a negative value.
2696 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
2697 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
2698 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
2699 struct ust_app_channel
**ua_chanp
)
2702 struct lttng_ht_iter iter
;
2703 struct lttng_ht_node_str
*ua_chan_node
;
2704 struct ust_app_channel
*ua_chan
;
2706 /* Lookup channel in the ust app session */
2707 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2708 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2709 if (ua_chan_node
!= NULL
) {
2710 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2714 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
2715 if (ua_chan
== NULL
) {
2716 /* Only malloc can fail here */
2720 shadow_copy_channel(ua_chan
, uchan
);
2722 /* Set channel type. */
2723 ua_chan
->attr
.type
= type
;
2725 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
2730 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
2733 /* Only add the channel if successful on the tracer side. */
2734 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
2738 *ua_chanp
= ua_chan
;
2741 /* Everything went well. */
2745 delete_ust_app_channel(ua_chan
->is_sent
? app
->sock
: -1, ua_chan
, app
);
2751 * Create UST app event and create it on the tracer side.
2753 * Called with ust app session mutex held.
2756 int create_ust_app_event(struct ust_app_session
*ua_sess
,
2757 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
2758 struct ust_app
*app
)
2761 struct ust_app_event
*ua_event
;
2763 /* Get event node */
2764 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2765 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
2766 if (ua_event
!= NULL
) {
2771 /* Does not exist so create one */
2772 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
2773 if (ua_event
== NULL
) {
2774 /* Only malloc can failed so something is really wrong */
2778 shadow_copy_event(ua_event
, uevent
);
2780 /* Create it on the tracer side */
2781 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2783 /* Not found previously means that it does not exist on the tracer */
2784 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
2788 add_unique_ust_app_event(ua_chan
, ua_event
);
2790 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
2797 /* Valid. Calling here is already in a read side lock */
2798 delete_ust_app_event(-1, ua_event
);
2803 * Create UST metadata and open it on the tracer side.
2805 * Called with UST app session lock held and RCU read side lock.
2807 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
2808 struct ust_app
*app
, struct consumer_output
*consumer
)
2811 struct ust_app_channel
*metadata
;
2812 struct consumer_socket
*socket
;
2813 struct ust_registry_session
*registry
;
2819 registry
= get_session_registry(ua_sess
);
2822 /* Metadata already exists for this registry or it was closed previously */
2823 if (registry
->metadata_key
|| registry
->metadata_closed
) {
2828 /* Allocate UST metadata */
2829 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
2831 /* malloc() failed */
2836 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
2838 /* Need one fd for the channel. */
2839 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2841 ERR("Exhausted number of available FD upon create metadata");
2845 /* Get the right consumer socket for the application. */
2846 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
2849 goto error_consumer
;
2853 * Keep metadata key so we can identify it on the consumer side. Assign it
2854 * to the registry *before* we ask the consumer so we avoid the race of the
2855 * consumer requesting the metadata and the ask_channel call on our side
2856 * did not returned yet.
2858 registry
->metadata_key
= metadata
->key
;
2861 * Ask the metadata channel creation to the consumer. The metadata object
2862 * will be created by the consumer and kept their. However, the stream is
2863 * never added or monitored until we do a first push metadata to the
2866 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
2869 /* Nullify the metadata key so we don't try to close it later on. */
2870 registry
->metadata_key
= 0;
2871 goto error_consumer
;
2875 * The setup command will make the metadata stream be sent to the relayd,
2876 * if applicable, and the thread managing the metadatas. This is important
2877 * because after this point, if an error occurs, the only way the stream
2878 * can be deleted is to be monitored in the consumer.
2880 ret
= consumer_setup_metadata(socket
, metadata
->key
);
2882 /* Nullify the metadata key so we don't try to close it later on. */
2883 registry
->metadata_key
= 0;
2884 goto error_consumer
;
2887 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
2888 metadata
->key
, app
->pid
);
2891 lttng_fd_put(LTTNG_FD_APPS
, 1);
2892 delete_ust_app_channel(-1, metadata
, app
);
2898 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2899 * acquired before calling this function.
2901 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
2903 struct ust_app
*app
= NULL
;
2904 struct lttng_ht_node_ulong
*node
;
2905 struct lttng_ht_iter iter
;
2907 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
2908 node
= lttng_ht_iter_get_node_ulong(&iter
);
2910 DBG2("UST app no found with pid %d", pid
);
2914 DBG2("Found UST app by pid %d", pid
);
2916 app
= caa_container_of(node
, struct ust_app
, pid_n
);
2923 * Allocate and init an UST app object using the registration information and
2924 * the command socket. This is called when the command socket connects to the
2927 * The object is returned on success or else NULL.
2929 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
2931 struct ust_app
*lta
= NULL
;
2936 DBG3("UST app creating application for socket %d", sock
);
2938 if ((msg
->bits_per_long
== 64 &&
2939 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
2940 || (msg
->bits_per_long
== 32 &&
2941 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
2942 ERR("Registration failed: application \"%s\" (pid: %d) has "
2943 "%d-bit long, but no consumerd for this size is available.\n",
2944 msg
->name
, msg
->pid
, msg
->bits_per_long
);
2948 lta
= zmalloc(sizeof(struct ust_app
));
2954 lta
->ppid
= msg
->ppid
;
2955 lta
->uid
= msg
->uid
;
2956 lta
->gid
= msg
->gid
;
2958 lta
->bits_per_long
= msg
->bits_per_long
;
2959 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
2960 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
2961 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
2962 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
2963 lta
->long_alignment
= msg
->long_alignment
;
2964 lta
->byte_order
= msg
->byte_order
;
2966 lta
->v_major
= msg
->major
;
2967 lta
->v_minor
= msg
->minor
;
2968 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2969 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2970 lta
->notify_sock
= -1;
2972 /* Copy name and make sure it's NULL terminated. */
2973 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
2974 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
2977 * Before this can be called, when receiving the registration information,
2978 * the application compatibility is checked. So, at this point, the
2979 * application can work with this session daemon.
2981 lta
->compatible
= 1;
2983 lta
->pid
= msg
->pid
;
2984 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
2986 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
2988 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
2995 * For a given application object, add it to every hash table.
2997 void ust_app_add(struct ust_app
*app
)
3000 assert(app
->notify_sock
>= 0);
3005 * On a re-registration, we want to kick out the previous registration of
3008 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3011 * The socket _should_ be unique until _we_ call close. So, a add_unique
3012 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3013 * already in the table.
3015 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3017 /* Add application to the notify socket hash table. */
3018 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3019 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3021 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3022 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3023 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3030 * Set the application version into the object.
3032 * Return 0 on success else a negative value either an errno code or a
3033 * LTTng-UST error code.
3035 int ust_app_version(struct ust_app
*app
)
3041 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3043 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3044 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3046 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3054 * Unregister app by removing it from the global traceable app list and freeing
3057 * The socket is already closed at this point so no close to sock.
3059 void ust_app_unregister(int sock
)
3061 struct ust_app
*lta
;
3062 struct lttng_ht_node_ulong
*node
;
3063 struct lttng_ht_iter iter
;
3064 struct ust_app_session
*ua_sess
;
3069 /* Get the node reference for a call_rcu */
3070 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
3071 node
= lttng_ht_iter_get_node_ulong(&iter
);
3074 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3075 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3077 /* Remove application from PID hash table */
3078 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3082 * Remove application from notify hash table. The thread handling the
3083 * notify socket could have deleted the node so ignore on error because
3084 * either way it's valid. The close of that socket is handled by the other
3087 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3088 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3091 * Ignore return value since the node might have been removed before by an
3092 * add replace during app registration because the PID can be reassigned by
3095 iter
.iter
.node
= <a
->pid_n
.node
;
3096 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3098 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3102 /* Remove sessions so they are not visible during deletion.*/
3103 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3105 struct ust_registry_session
*registry
;
3107 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3109 /* The session was already removed so scheduled for teardown. */
3114 * Add session to list for teardown. This is safe since at this point we
3115 * are the only one using this list.
3117 pthread_mutex_lock(&ua_sess
->lock
);
3120 * Normally, this is done in the delete session process which is
3121 * executed in the call rcu below. However, upon registration we can't
3122 * afford to wait for the grace period before pushing data or else the
3123 * data pending feature can race between the unregistration and stop
3124 * command where the data pending command is sent *before* the grace
3127 * The close metadata below nullifies the metadata pointer in the
3128 * session so the delete session will NOT push/close a second time.
3130 registry
= get_session_registry(ua_sess
);
3131 if (registry
&& !registry
->metadata_closed
) {
3132 /* Push metadata for application before freeing the application. */
3133 (void) push_metadata(registry
, ua_sess
->consumer
);
3136 * Don't ask to close metadata for global per UID buffers. Close
3137 * metadata only on destroy trace session in this case. Also, the
3138 * previous push metadata could have flag the metadata registry to
3139 * close so don't send a close command if closed.
3141 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
&&
3142 !registry
->metadata_closed
) {
3143 /* And ask to close it for this session registry. */
3144 (void) close_metadata(registry
, ua_sess
->consumer
);
3148 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3149 pthread_mutex_unlock(&ua_sess
->lock
);
3153 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3160 * Fill events array with all events name of all registered apps.
3162 int ust_app_list_events(struct lttng_event
**events
)
3165 size_t nbmem
, count
= 0;
3166 struct lttng_ht_iter iter
;
3167 struct ust_app
*app
;
3168 struct lttng_event
*tmp_event
;
3170 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3171 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3172 if (tmp_event
== NULL
) {
3173 PERROR("zmalloc ust app events");
3180 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3181 struct lttng_ust_tracepoint_iter uiter
;
3183 health_code_update();
3185 if (!app
->compatible
) {
3187 * TODO: In time, we should notice the caller of this error by
3188 * telling him that this is a version error.
3192 handle
= ustctl_tracepoint_list(app
->sock
);
3194 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3195 ERR("UST app list events getting handle failed for app pid %d",
3201 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3202 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3203 /* Handle ustctl error. */
3205 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3206 ERR("UST app tp list get failed for app %d with ret %d",
3209 DBG3("UST app tp list get failed. Application is dead");
3211 * This is normal behavior, an application can die during the
3212 * creation process. Don't report an error so the execution can
3213 * continue normally. Continue normal execution.
3221 health_code_update();
3222 if (count
>= nbmem
) {
3223 /* In case the realloc fails, we free the memory */
3224 struct lttng_event
*new_tmp_event
;
3227 new_nbmem
= nbmem
<< 1;
3228 DBG2("Reallocating event list from %zu to %zu entries",
3230 new_tmp_event
= realloc(tmp_event
,
3231 new_nbmem
* sizeof(struct lttng_event
));
3232 if (new_tmp_event
== NULL
) {
3233 PERROR("realloc ust app events");
3238 /* Zero the new memory */
3239 memset(new_tmp_event
+ nbmem
, 0,
3240 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3242 tmp_event
= new_tmp_event
;
3244 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3245 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3246 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3247 tmp_event
[count
].pid
= app
->pid
;
3248 tmp_event
[count
].enabled
= -1;
3254 *events
= tmp_event
;
3256 DBG2("UST app list events done (%zu events)", count
);
3261 health_code_update();
3266 * Fill events array with all events name of all registered apps.
3268 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3271 size_t nbmem
, count
= 0;
3272 struct lttng_ht_iter iter
;
3273 struct ust_app
*app
;
3274 struct lttng_event_field
*tmp_event
;
3276 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3277 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3278 if (tmp_event
== NULL
) {
3279 PERROR("zmalloc ust app event fields");
3286 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3287 struct lttng_ust_field_iter uiter
;
3289 health_code_update();
3291 if (!app
->compatible
) {
3293 * TODO: In time, we should notice the caller of this error by
3294 * telling him that this is a version error.
3298 handle
= ustctl_tracepoint_field_list(app
->sock
);
3300 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3301 ERR("UST app list field getting handle failed for app pid %d",
3307 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3308 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3309 /* Handle ustctl error. */
3311 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3312 ERR("UST app tp list field failed for app %d with ret %d",
3315 DBG3("UST app tp list field failed. Application is dead");
3317 * This is normal behavior, an application can die during the
3318 * creation process. Don't report an error so the execution can
3319 * continue normally. Reset list and count for next app.
3327 health_code_update();
3328 if (count
>= nbmem
) {
3329 /* In case the realloc fails, we free the memory */
3330 struct lttng_event_field
*new_tmp_event
;
3333 new_nbmem
= nbmem
<< 1;
3334 DBG2("Reallocating event field list from %zu to %zu entries",
3336 new_tmp_event
= realloc(tmp_event
,
3337 new_nbmem
* sizeof(struct lttng_event_field
));
3338 if (new_tmp_event
== NULL
) {
3339 PERROR("realloc ust app event fields");
3344 /* Zero the new memory */
3345 memset(new_tmp_event
+ nbmem
, 0,
3346 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3348 tmp_event
= new_tmp_event
;
3351 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3352 /* Mapping between these enums matches 1 to 1. */
3353 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3354 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3356 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3357 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3358 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3359 tmp_event
[count
].event
.pid
= app
->pid
;
3360 tmp_event
[count
].event
.enabled
= -1;
3366 *fields
= tmp_event
;
3368 DBG2("UST app list event fields done (%zu events)", count
);
3373 health_code_update();
3378 * Free and clean all traceable apps of the global list.
3380 * Should _NOT_ be called with RCU read-side lock held.
3382 void ust_app_clean_list(void)
3385 struct ust_app
*app
;
3386 struct lttng_ht_iter iter
;
3388 DBG2("UST app cleaning registered apps hash table");
3392 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3393 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3395 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3398 /* Cleanup socket hash table */
3399 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3401 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3405 /* Cleanup notify socket hash table */
3406 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3407 notify_sock_n
.node
) {
3408 ret
= lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3413 /* Destroy is done only when the ht is empty */
3414 ht_cleanup_push(ust_app_ht
);
3415 ht_cleanup_push(ust_app_ht_by_sock
);
3416 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3420 * Init UST app hash table.
3422 void ust_app_ht_alloc(void)
3424 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3425 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3426 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3430 * For a specific UST session, disable the channel for all registered apps.
3432 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3433 struct ltt_ust_channel
*uchan
)
3436 struct lttng_ht_iter iter
;
3437 struct lttng_ht_node_str
*ua_chan_node
;
3438 struct ust_app
*app
;
3439 struct ust_app_session
*ua_sess
;
3440 struct ust_app_channel
*ua_chan
;
3442 if (usess
== NULL
|| uchan
== NULL
) {
3443 ERR("Disabling UST global channel with NULL values");
3448 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3449 uchan
->name
, usess
->id
);
3453 /* For every registered applications */
3454 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3455 struct lttng_ht_iter uiter
;
3456 if (!app
->compatible
) {
3458 * TODO: In time, we should notice the caller of this error by
3459 * telling him that this is a version error.
3463 ua_sess
= lookup_session_by_app(usess
, app
);
3464 if (ua_sess
== NULL
) {
3469 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3470 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3471 /* If the session if found for the app, the channel must be there */
3472 assert(ua_chan_node
);
3474 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3475 /* The channel must not be already disabled */
3476 assert(ua_chan
->enabled
== 1);
3478 /* Disable channel onto application */
3479 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
3481 /* XXX: We might want to report this error at some point... */
3493 * For a specific UST session, enable the channel for all registered apps.
3495 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
3496 struct ltt_ust_channel
*uchan
)
3499 struct lttng_ht_iter iter
;
3500 struct ust_app
*app
;
3501 struct ust_app_session
*ua_sess
;
3503 if (usess
== NULL
|| uchan
== NULL
) {
3504 ERR("Adding UST global channel to NULL values");
3509 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
3510 uchan
->name
, usess
->id
);
3514 /* For every registered applications */
3515 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3516 if (!app
->compatible
) {
3518 * TODO: In time, we should notice the caller of this error by
3519 * telling him that this is a version error.
3523 ua_sess
= lookup_session_by_app(usess
, app
);
3524 if (ua_sess
== NULL
) {
3528 /* Enable channel onto application */
3529 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
3531 /* XXX: We might want to report this error at some point... */
3543 * Disable an event in a channel and for a specific session.
3545 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
3546 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3549 struct lttng_ht_iter iter
, uiter
;
3550 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
3551 struct ust_app
*app
;
3552 struct ust_app_session
*ua_sess
;
3553 struct ust_app_channel
*ua_chan
;
3554 struct ust_app_event
*ua_event
;
3556 DBG("UST app disabling event %s for all apps in channel "
3557 "%s for session id %" PRIu64
,
3558 uevent
->attr
.name
, uchan
->name
, usess
->id
);
3562 /* For all registered applications */
3563 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3564 if (!app
->compatible
) {
3566 * TODO: In time, we should notice the caller of this error by
3567 * telling him that this is a version error.
3571 ua_sess
= lookup_session_by_app(usess
, app
);
3572 if (ua_sess
== NULL
) {
3577 /* Lookup channel in the ust app session */
3578 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3579 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3580 if (ua_chan_node
== NULL
) {
3581 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
3582 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
3585 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3587 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
3588 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
3589 if (ua_event_node
== NULL
) {
3590 DBG2("Event %s not found in channel %s for app pid %d."
3591 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
3594 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
3596 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
3598 /* XXX: Report error someday... */
3609 * For a specific UST session, create the channel for all registered apps.
3611 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
3612 struct ltt_ust_channel
*uchan
)
3614 int ret
= 0, created
;
3615 struct lttng_ht_iter iter
;
3616 struct ust_app
*app
;
3617 struct ust_app_session
*ua_sess
= NULL
;
3619 /* Very wrong code flow */
3623 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64
,
3624 uchan
->name
, usess
->id
);
3628 /* For every registered applications */
3629 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3630 if (!app
->compatible
) {
3632 * TODO: In time, we should notice the caller of this error by
3633 * telling him that this is a version error.
3638 * Create session on the tracer side and add it to app session HT. Note
3639 * that if session exist, it will simply return a pointer to the ust
3642 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
3647 * The application's socket is not valid. Either a bad socket
3648 * or a timeout on it. We can't inform the caller that for a
3649 * specific app, the session failed so lets continue here.
3654 goto error_rcu_unlock
;
3659 pthread_mutex_lock(&ua_sess
->lock
);
3660 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
3661 sizeof(uchan
->name
))) {
3662 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
, &uchan
->attr
);
3665 /* Create channel onto application. We don't need the chan ref. */
3666 ret
= create_ust_app_channel(ua_sess
, uchan
, app
,
3667 LTTNG_UST_CHAN_PER_CPU
, usess
, NULL
);
3669 pthread_mutex_unlock(&ua_sess
->lock
);
3671 if (ret
== -ENOMEM
) {
3672 /* No more memory is a fatal error. Stop right now. */
3673 goto error_rcu_unlock
;
3675 /* Cleanup the created session if it's the case. */
3677 destroy_app_session(app
, ua_sess
);
3688 * Enable event for a specific session and channel on the tracer.
3690 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
3691 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3694 struct lttng_ht_iter iter
, uiter
;
3695 struct lttng_ht_node_str
*ua_chan_node
;
3696 struct ust_app
*app
;
3697 struct ust_app_session
*ua_sess
;
3698 struct ust_app_channel
*ua_chan
;
3699 struct ust_app_event
*ua_event
;
3701 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
3702 uevent
->attr
.name
, usess
->id
);
3705 * NOTE: At this point, this function is called only if the session and
3706 * channel passed are already created for all apps. and enabled on the
3712 /* For all registered applications */
3713 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3714 if (!app
->compatible
) {
3716 * TODO: In time, we should notice the caller of this error by
3717 * telling him that this is a version error.
3721 ua_sess
= lookup_session_by_app(usess
, app
);
3723 /* The application has problem or is probably dead. */
3727 pthread_mutex_lock(&ua_sess
->lock
);
3729 /* Lookup channel in the ust app session */
3730 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3731 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3732 /* If the channel is not found, there is a code flow error */
3733 assert(ua_chan_node
);
3735 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3737 /* Get event node */
3738 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
3739 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
3740 if (ua_event
== NULL
) {
3741 DBG3("UST app enable event %s not found for app PID %d."
3742 "Skipping app", uevent
->attr
.name
, app
->pid
);
3746 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
3748 pthread_mutex_unlock(&ua_sess
->lock
);
3752 pthread_mutex_unlock(&ua_sess
->lock
);
3761 * For a specific existing UST session and UST channel, creates the event for
3762 * all registered apps.
3764 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
3765 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3768 struct lttng_ht_iter iter
, uiter
;
3769 struct lttng_ht_node_str
*ua_chan_node
;
3770 struct ust_app
*app
;
3771 struct ust_app_session
*ua_sess
;
3772 struct ust_app_channel
*ua_chan
;
3774 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
3775 uevent
->attr
.name
, usess
->id
);
3779 /* For all registered applications */
3780 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3781 if (!app
->compatible
) {
3783 * TODO: In time, we should notice the caller of this error by
3784 * telling him that this is a version error.
3788 ua_sess
= lookup_session_by_app(usess
, app
);
3790 /* The application has problem or is probably dead. */
3794 pthread_mutex_lock(&ua_sess
->lock
);
3795 /* Lookup channel in the ust app session */
3796 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3797 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3798 /* If the channel is not found, there is a code flow error */
3799 assert(ua_chan_node
);
3801 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3803 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
3804 pthread_mutex_unlock(&ua_sess
->lock
);
3806 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
3807 /* Possible value at this point: -ENOMEM. If so, we stop! */
3810 DBG2("UST app event %s already exist on app PID %d",
3811 uevent
->attr
.name
, app
->pid
);
3822 * Start tracing for a specific UST session and app.
3825 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3828 struct ust_app_session
*ua_sess
;
3830 DBG("Starting tracing for ust app pid %d", app
->pid
);
3834 if (!app
->compatible
) {
3838 ua_sess
= lookup_session_by_app(usess
, app
);
3839 if (ua_sess
== NULL
) {
3840 /* The session is in teardown process. Ignore and continue. */
3844 pthread_mutex_lock(&ua_sess
->lock
);
3846 /* Upon restart, we skip the setup, already done */
3847 if (ua_sess
->started
) {
3851 /* Create directories if consumer is LOCAL and has a path defined. */
3852 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
3853 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
3854 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
3855 S_IRWXU
| S_IRWXG
, ua_sess
->euid
, ua_sess
->egid
);
3857 if (ret
!= -EEXIST
) {
3858 ERR("Trace directory creation error");
3865 * Create the metadata for the application. This returns gracefully if a
3866 * metadata was already set for the session.
3868 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
3873 health_code_update();
3876 /* This start the UST tracing */
3877 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
3879 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3880 ERR("Error starting tracing for app pid: %d (ret: %d)",
3883 DBG("UST app start session failed. Application is dead.");
3885 * This is normal behavior, an application can die during the
3886 * creation process. Don't report an error so the execution can
3887 * continue normally.
3889 pthread_mutex_unlock(&ua_sess
->lock
);
3895 /* Indicate that the session has been started once */
3896 ua_sess
->started
= 1;
3898 pthread_mutex_unlock(&ua_sess
->lock
);
3900 health_code_update();
3902 /* Quiescent wait after starting trace */
3903 ret
= ustctl_wait_quiescent(app
->sock
);
3904 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3905 ERR("UST app wait quiescent failed for app pid %d ret %d",
3911 health_code_update();
3915 pthread_mutex_unlock(&ua_sess
->lock
);
3917 health_code_update();
3922 * Stop tracing for a specific UST session and app.
3925 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3928 struct ust_app_session
*ua_sess
;
3929 struct ust_registry_session
*registry
;
3931 DBG("Stopping tracing for ust app pid %d", app
->pid
);
3935 if (!app
->compatible
) {
3936 goto end_no_session
;
3939 ua_sess
= lookup_session_by_app(usess
, app
);
3940 if (ua_sess
== NULL
) {
3941 goto end_no_session
;
3944 pthread_mutex_lock(&ua_sess
->lock
);
3947 * If started = 0, it means that stop trace has been called for a session
3948 * that was never started. It's possible since we can have a fail start
3949 * from either the application manager thread or the command thread. Simply
3950 * indicate that this is a stop error.
3952 if (!ua_sess
->started
) {
3953 goto error_rcu_unlock
;
3956 health_code_update();
3958 /* This inhibits UST tracing */
3959 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
3961 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3962 ERR("Error stopping tracing for app pid: %d (ret: %d)",
3965 DBG("UST app stop session failed. Application is dead.");
3967 * This is normal behavior, an application can die during the
3968 * creation process. Don't report an error so the execution can
3969 * continue normally.
3973 goto error_rcu_unlock
;
3976 health_code_update();
3978 /* Quiescent wait after stopping trace */
3979 ret
= ustctl_wait_quiescent(app
->sock
);
3980 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3981 ERR("UST app wait quiescent failed for app pid %d ret %d",
3985 health_code_update();
3987 registry
= get_session_registry(ua_sess
);
3990 if (!registry
->metadata_closed
) {
3991 /* Push metadata for application before freeing the application. */
3992 (void) push_metadata(registry
, ua_sess
->consumer
);
3996 pthread_mutex_unlock(&ua_sess
->lock
);
3999 health_code_update();
4003 pthread_mutex_unlock(&ua_sess
->lock
);
4005 health_code_update();
4010 * Flush buffers for a specific UST session and app.
4013 int ust_app_flush_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4016 struct lttng_ht_iter iter
;
4017 struct ust_app_session
*ua_sess
;
4018 struct ust_app_channel
*ua_chan
;
4020 DBG("Flushing buffers for ust app pid %d", app
->pid
);
4024 if (!app
->compatible
) {
4025 goto end_no_session
;
4028 ua_sess
= lookup_session_by_app(usess
, app
);
4029 if (ua_sess
== NULL
) {
4030 goto end_no_session
;
4033 pthread_mutex_lock(&ua_sess
->lock
);
4035 health_code_update();
4037 /* Flushing buffers */
4038 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4040 health_code_update();
4041 assert(ua_chan
->is_sent
);
4042 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
4044 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4045 ERR("UST app PID %d channel %s flush failed with ret %d",
4046 app
->pid
, ua_chan
->name
, ret
);
4048 DBG3("UST app failed to flush %s. Application is dead.",
4051 * This is normal behavior, an application can die during the
4052 * creation process. Don't report an error so the execution can
4053 * continue normally.
4056 /* Continuing flushing all buffers */
4061 health_code_update();
4063 pthread_mutex_unlock(&ua_sess
->lock
);
4066 health_code_update();
4071 * Destroy a specific UST session in apps.
4073 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4076 struct ust_app_session
*ua_sess
;
4077 struct lttng_ht_iter iter
;
4078 struct lttng_ht_node_u64
*node
;
4080 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4084 if (!app
->compatible
) {
4088 __lookup_session_by_app(usess
, app
, &iter
);
4089 node
= lttng_ht_iter_get_node_u64(&iter
);
4091 /* Session is being or is deleted. */
4094 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4096 health_code_update();
4097 destroy_app_session(app
, ua_sess
);
4099 health_code_update();
4101 /* Quiescent wait after stopping trace */
4102 ret
= ustctl_wait_quiescent(app
->sock
);
4103 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4104 ERR("UST app wait quiescent failed for app pid %d ret %d",
4109 health_code_update();
4114 * Start tracing for the UST session.
4116 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4119 struct lttng_ht_iter iter
;
4120 struct ust_app
*app
;
4122 DBG("Starting all UST traces");
4126 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4127 ret
= ust_app_start_trace(usess
, app
);
4129 /* Continue to next apps even on error */
4140 * Start tracing for the UST session.
4142 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4145 struct lttng_ht_iter iter
;
4146 struct ust_app
*app
;
4148 DBG("Stopping all UST traces");
4152 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4153 ret
= ust_app_stop_trace(usess
, app
);
4155 /* Continue to next apps even on error */
4160 /* Flush buffers and push metadata (for UID buffers). */
4161 switch (usess
->buffer_type
) {
4162 case LTTNG_BUFFER_PER_UID
:
4164 struct buffer_reg_uid
*reg
;
4166 /* Flush all per UID buffers associated to that session. */
4167 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4168 struct ust_registry_session
*ust_session_reg
;
4169 struct buffer_reg_channel
*reg_chan
;
4170 struct consumer_socket
*socket
;
4172 /* Get consumer socket to use to push the metadata.*/
4173 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4176 /* Ignore request if no consumer is found for the session. */
4180 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4181 reg_chan
, node
.node
) {
4183 * The following call will print error values so the return
4184 * code is of little importance because whatever happens, we
4185 * have to try them all.
4187 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4190 ust_session_reg
= reg
->registry
->reg
.ust
;
4191 if (!ust_session_reg
->metadata_closed
) {
4192 /* Push metadata. */
4193 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4199 case LTTNG_BUFFER_PER_PID
:
4200 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4201 ret
= ust_app_flush_trace(usess
, app
);
4203 /* Continue to next apps even on error */
4219 * Destroy app UST session.
4221 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
4224 struct lttng_ht_iter iter
;
4225 struct ust_app
*app
;
4227 DBG("Destroy all UST traces");
4231 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4232 ret
= destroy_trace(usess
, app
);
4234 /* Continue to next apps even on error */
4245 * Add channels/events from UST global domain to registered apps at sock.
4247 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
4250 struct lttng_ht_iter iter
, uiter
;
4251 struct ust_app
*app
;
4252 struct ust_app_session
*ua_sess
= NULL
;
4253 struct ust_app_channel
*ua_chan
;
4254 struct ust_app_event
*ua_event
;
4255 struct ust_app_ctx
*ua_ctx
;
4260 DBG2("UST app global update for app sock %d for session id %" PRIu64
, sock
,
4265 app
= ust_app_find_by_sock(sock
);
4268 * Application can be unregistered before so this is possible hence
4269 * simply stopping the update.
4271 DBG3("UST app update failed to find app sock %d", sock
);
4275 if (!app
->compatible
) {
4279 ret
= create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
4281 /* Tracer is probably gone or ENOMEM. */
4286 pthread_mutex_lock(&ua_sess
->lock
);
4289 * We can iterate safely here over all UST app session since the create ust
4290 * app session above made a shadow copy of the UST global domain from the
4293 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4295 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
4298 * Stop everything. On error, the application failed, no more
4299 * file descriptor are available or ENOMEM so stopping here is
4300 * the only thing we can do for now.
4306 * Add context using the list so they are enabled in the same order the
4309 cds_list_for_each_entry(ua_ctx
, &ua_chan
->ctx_list
, list
) {
4310 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
4317 /* For each events */
4318 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
4320 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
4327 pthread_mutex_unlock(&ua_sess
->lock
);
4329 if (usess
->active
) {
4330 ret
= ust_app_start_trace(usess
, app
);
4335 DBG2("UST trace started for app pid %d", app
->pid
);
4338 /* Everything went well at this point. */
4343 pthread_mutex_unlock(&ua_sess
->lock
);
4346 destroy_app_session(app
, ua_sess
);
4353 * Add context to a specific channel for global UST domain.
4355 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
4356 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
4359 struct lttng_ht_node_str
*ua_chan_node
;
4360 struct lttng_ht_iter iter
, uiter
;
4361 struct ust_app_channel
*ua_chan
= NULL
;
4362 struct ust_app_session
*ua_sess
;
4363 struct ust_app
*app
;
4367 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4368 if (!app
->compatible
) {
4370 * TODO: In time, we should notice the caller of this error by
4371 * telling him that this is a version error.
4375 ua_sess
= lookup_session_by_app(usess
, app
);
4376 if (ua_sess
== NULL
) {
4380 pthread_mutex_lock(&ua_sess
->lock
);
4381 /* Lookup channel in the ust app session */
4382 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4383 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4384 if (ua_chan_node
== NULL
) {
4387 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
4389 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
4394 pthread_mutex_unlock(&ua_sess
->lock
);
4402 * Enable event for a channel from a UST session for a specific PID.
4404 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
4405 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
4408 struct lttng_ht_iter iter
;
4409 struct lttng_ht_node_str
*ua_chan_node
;
4410 struct ust_app
*app
;
4411 struct ust_app_session
*ua_sess
;
4412 struct ust_app_channel
*ua_chan
;
4413 struct ust_app_event
*ua_event
;
4415 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
4419 app
= ust_app_find_by_pid(pid
);
4421 ERR("UST app enable event per PID %d not found", pid
);
4426 if (!app
->compatible
) {
4431 ua_sess
= lookup_session_by_app(usess
, app
);
4433 /* The application has problem or is probably dead. */
4438 pthread_mutex_lock(&ua_sess
->lock
);
4439 /* Lookup channel in the ust app session */
4440 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
4441 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
4442 /* If the channel is not found, there is a code flow error */
4443 assert(ua_chan_node
);
4445 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4447 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4448 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4449 if (ua_event
== NULL
) {
4450 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4455 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4462 pthread_mutex_unlock(&ua_sess
->lock
);
4469 * Calibrate registered applications.
4471 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
4474 struct lttng_ht_iter iter
;
4475 struct ust_app
*app
;
4479 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4480 if (!app
->compatible
) {
4482 * TODO: In time, we should notice the caller of this error by
4483 * telling him that this is a version error.
4488 health_code_update();
4490 ret
= ustctl_calibrate(app
->sock
, calibrate
);
4494 /* Means that it's not implemented on the tracer side. */
4498 DBG2("Calibrate app PID %d returned with error %d",
4505 DBG("UST app global domain calibration finished");
4509 health_code_update();
4515 * Receive registration and populate the given msg structure.
4517 * On success return 0 else a negative value returned by the ustctl call.
4519 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
4522 uint32_t pid
, ppid
, uid
, gid
;
4526 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
4527 &pid
, &ppid
, &uid
, &gid
,
4528 &msg
->bits_per_long
,
4529 &msg
->uint8_t_alignment
,
4530 &msg
->uint16_t_alignment
,
4531 &msg
->uint32_t_alignment
,
4532 &msg
->uint64_t_alignment
,
4533 &msg
->long_alignment
,
4540 case LTTNG_UST_ERR_EXITING
:
4541 DBG3("UST app recv reg message failed. Application died");
4543 case LTTNG_UST_ERR_UNSUP_MAJOR
:
4544 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
4545 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
4546 LTTNG_UST_ABI_MINOR_VERSION
);
4549 ERR("UST app recv reg message failed with ret %d", ret
);
4554 msg
->pid
= (pid_t
) pid
;
4555 msg
->ppid
= (pid_t
) ppid
;
4556 msg
->uid
= (uid_t
) uid
;
4557 msg
->gid
= (gid_t
) gid
;
4564 * Return a ust app channel object using the application object and the channel
4565 * object descriptor has a key. If not found, NULL is returned. A RCU read side
4566 * lock MUST be acquired before calling this function.
4568 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
4571 struct lttng_ht_node_ulong
*node
;
4572 struct lttng_ht_iter iter
;
4573 struct ust_app_channel
*ua_chan
= NULL
;
4577 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
4578 node
= lttng_ht_iter_get_node_ulong(&iter
);
4580 DBG2("UST app channel find by objd %d not found", objd
);
4584 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
4591 * Reply to a register channel notification from an application on the notify
4592 * socket. The channel metadata is also created.
4594 * The session UST registry lock is acquired in this function.
4596 * On success 0 is returned else a negative value.
4598 static int reply_ust_register_channel(int sock
, int sobjd
, int cobjd
,
4599 size_t nr_fields
, struct ustctl_field
*fields
)
4601 int ret
, ret_code
= 0;
4602 uint32_t chan_id
, reg_count
;
4603 uint64_t chan_reg_key
;
4604 enum ustctl_channel_header type
;
4605 struct ust_app
*app
;
4606 struct ust_app_channel
*ua_chan
;
4607 struct ust_app_session
*ua_sess
;
4608 struct ust_registry_session
*registry
;
4609 struct ust_registry_channel
*chan_reg
;
4613 /* Lookup application. If not found, there is a code flow error. */
4614 app
= find_app_by_notify_sock(sock
);
4616 DBG("Application socket %d is being teardown. Abort event notify",
4620 goto error_rcu_unlock
;
4623 /* Lookup channel by UST object descriptor. */
4624 ua_chan
= find_channel_by_objd(app
, cobjd
);
4626 DBG("Application channel is being teardown. Abort event notify");
4629 goto error_rcu_unlock
;
4632 assert(ua_chan
->session
);
4633 ua_sess
= ua_chan
->session
;
4635 /* Get right session registry depending on the session buffer type. */
4636 registry
= get_session_registry(ua_sess
);
4639 /* Depending on the buffer type, a different channel key is used. */
4640 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4641 chan_reg_key
= ua_chan
->tracing_channel_id
;
4643 chan_reg_key
= ua_chan
->key
;
4646 pthread_mutex_lock(®istry
->lock
);
4648 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
4651 if (!chan_reg
->register_done
) {
4652 reg_count
= ust_registry_get_event_count(chan_reg
);
4653 if (reg_count
< 31) {
4654 type
= USTCTL_CHANNEL_HEADER_COMPACT
;
4656 type
= USTCTL_CHANNEL_HEADER_LARGE
;
4659 chan_reg
->nr_ctx_fields
= nr_fields
;
4660 chan_reg
->ctx_fields
= fields
;
4661 chan_reg
->header_type
= type
;
4663 /* Get current already assigned values. */
4664 type
= chan_reg
->header_type
;
4666 /* Set to NULL so the error path does not do a double free. */
4669 /* Channel id is set during the object creation. */
4670 chan_id
= chan_reg
->chan_id
;
4672 /* Append to metadata */
4673 if (!chan_reg
->metadata_dumped
) {
4674 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
4676 ERR("Error appending channel metadata (errno = %d)", ret_code
);
4682 DBG3("UST app replying to register channel key %" PRIu64
4683 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
4686 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
4688 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4689 ERR("UST app reply channel failed with ret %d", ret
);
4691 DBG3("UST app reply channel failed. Application died");
4696 /* This channel registry registration is completed. */
4697 chan_reg
->register_done
= 1;
4700 pthread_mutex_unlock(®istry
->lock
);
4710 * Add event to the UST channel registry. When the event is added to the
4711 * registry, the metadata is also created. Once done, this replies to the
4712 * application with the appropriate error code.
4714 * The session UST registry lock is acquired in the function.
4716 * On success 0 is returned else a negative value.
4718 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
4719 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
, int loglevel
,
4720 char *model_emf_uri
)
4723 uint32_t event_id
= 0;
4724 uint64_t chan_reg_key
;
4725 struct ust_app
*app
;
4726 struct ust_app_channel
*ua_chan
;
4727 struct ust_app_session
*ua_sess
;
4728 struct ust_registry_session
*registry
;
4732 /* Lookup application. If not found, there is a code flow error. */
4733 app
= find_app_by_notify_sock(sock
);
4735 DBG("Application socket %d is being teardown. Abort event notify",
4740 free(model_emf_uri
);
4741 goto error_rcu_unlock
;
4744 /* Lookup channel by UST object descriptor. */
4745 ua_chan
= find_channel_by_objd(app
, cobjd
);
4747 DBG("Application channel is being teardown. Abort event notify");
4751 free(model_emf_uri
);
4752 goto error_rcu_unlock
;
4755 assert(ua_chan
->session
);
4756 ua_sess
= ua_chan
->session
;
4758 registry
= get_session_registry(ua_sess
);
4761 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4762 chan_reg_key
= ua_chan
->tracing_channel_id
;
4764 chan_reg_key
= ua_chan
->key
;
4767 pthread_mutex_lock(®istry
->lock
);
4770 * From this point on, this call acquires the ownership of the sig, fields
4771 * and model_emf_uri meaning any free are done inside it if needed. These
4772 * three variables MUST NOT be read/write after this.
4774 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
4775 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
, loglevel
,
4776 model_emf_uri
, ua_sess
->buffer_type
, &event_id
,
4780 * The return value is returned to ustctl so in case of an error, the
4781 * application can be notified. In case of an error, it's important not to
4782 * return a negative error or else the application will get closed.
4784 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
4786 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4787 ERR("UST app reply event failed with ret %d", ret
);
4789 DBG3("UST app reply event failed. Application died");
4792 * No need to wipe the create event since the application socket will
4793 * get close on error hence cleaning up everything by itself.
4798 DBG3("UST registry event %s with id %" PRId32
" added successfully",
4802 pthread_mutex_unlock(®istry
->lock
);
4809 * Handle application notification through the given notify socket.
4811 * Return 0 on success or else a negative value.
4813 int ust_app_recv_notify(int sock
)
4816 enum ustctl_notify_cmd cmd
;
4818 DBG3("UST app receiving notify from sock %d", sock
);
4820 ret
= ustctl_recv_notify(sock
, &cmd
);
4822 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4823 ERR("UST app recv notify failed with ret %d", ret
);
4825 DBG3("UST app recv notify failed. Application died");
4831 case USTCTL_NOTIFY_CMD_EVENT
:
4833 int sobjd
, cobjd
, loglevel
;
4834 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
4836 struct ustctl_field
*fields
;
4838 DBG2("UST app ustctl register event received");
4840 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
, &loglevel
,
4841 &sig
, &nr_fields
, &fields
, &model_emf_uri
);
4843 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4844 ERR("UST app recv event failed with ret %d", ret
);
4846 DBG3("UST app recv event failed. Application died");
4852 * Add event to the UST registry coming from the notify socket. This
4853 * call will free if needed the sig, fields and model_emf_uri. This
4854 * code path loses the ownsership of these variables and transfer them
4855 * to the this function.
4857 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
4858 fields
, loglevel
, model_emf_uri
);
4865 case USTCTL_NOTIFY_CMD_CHANNEL
:
4869 struct ustctl_field
*fields
;
4871 DBG2("UST app ustctl register channel received");
4873 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
4876 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4877 ERR("UST app recv channel failed with ret %d", ret
);
4879 DBG3("UST app recv channel failed. Application died");
4885 * The fields ownership are transfered to this function call meaning
4886 * that if needed it will be freed. After this, it's invalid to access
4887 * fields or clean it up.
4889 ret
= reply_ust_register_channel(sock
, sobjd
, cobjd
, nr_fields
,
4898 /* Should NEVER happen. */
4907 * Once the notify socket hangs up, this is called. First, it tries to find the
4908 * corresponding application. On failure, the call_rcu to close the socket is
4909 * executed. If an application is found, it tries to delete it from the notify
4910 * socket hash table. Whathever the result, it proceeds to the call_rcu.
4912 * Note that an object needs to be allocated here so on ENOMEM failure, the
4913 * call RCU is not done but the rest of the cleanup is.
4915 void ust_app_notify_sock_unregister(int sock
)
4918 struct lttng_ht_iter iter
;
4919 struct ust_app
*app
;
4920 struct ust_app_notify_sock_obj
*obj
;
4926 obj
= zmalloc(sizeof(*obj
));
4929 * An ENOMEM is kind of uncool. If this strikes we continue the
4930 * procedure but the call_rcu will not be called. In this case, we
4931 * accept the fd leak rather than possibly creating an unsynchronized
4932 * state between threads.
4934 * TODO: The notify object should be created once the notify socket is
4935 * registered and stored independantely from the ust app object. The
4936 * tricky part is to synchronize the teardown of the application and
4937 * this notify object. Let's keep that in mind so we can avoid this
4938 * kind of shenanigans with ENOMEM in the teardown path.
4945 DBG("UST app notify socket unregister %d", sock
);
4948 * Lookup application by notify socket. If this fails, this means that the
4949 * hash table delete has already been done by the application
4950 * unregistration process so we can safely close the notify socket in a
4953 app
= find_app_by_notify_sock(sock
);
4958 iter
.iter
.node
= &app
->notify_sock_n
.node
;
4961 * Whatever happens here either we fail or succeed, in both cases we have
4962 * to close the socket after a grace period to continue to the call RCU
4963 * here. If the deletion is successful, the application is not visible
4964 * anymore by other threads and is it fails it means that it was already
4965 * deleted from the hash table so either way we just have to close the
4968 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
4974 * Close socket after a grace period to avoid for the socket to be reused
4975 * before the application object is freed creating potential race between
4976 * threads trying to add unique in the global hash table.
4979 call_rcu(&obj
->head
, close_notify_sock_rcu
);
4984 * Destroy a ust app data structure and free its memory.
4986 void ust_app_destroy(struct ust_app
*app
)
4992 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
4996 * Take a snapshot for a given UST session. The snapshot is sent to the given
4999 * Return 0 on success or else a negative value.
5001 int ust_app_snapshot_record(struct ltt_ust_session
*usess
,
5002 struct snapshot_output
*output
, int wait
, uint64_t max_stream_size
)
5005 unsigned int snapshot_done
= 0;
5006 struct lttng_ht_iter iter
;
5007 struct ust_app
*app
;
5008 char pathname
[PATH_MAX
];
5015 switch (usess
->buffer_type
) {
5016 case LTTNG_BUFFER_PER_UID
:
5018 struct buffer_reg_uid
*reg
;
5020 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5021 struct buffer_reg_channel
*reg_chan
;
5022 struct consumer_socket
*socket
;
5024 /* Get consumer socket to use to push the metadata.*/
5025 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5032 memset(pathname
, 0, sizeof(pathname
));
5033 ret
= snprintf(pathname
, sizeof(pathname
),
5034 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5035 reg
->uid
, reg
->bits_per_long
);
5037 PERROR("snprintf snapshot path");
5041 /* Add the UST default trace dir to path. */
5042 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5043 reg_chan
, node
.node
) {
5044 ret
= consumer_snapshot_channel(socket
, reg_chan
->consumer_key
,
5045 output
, 0, usess
->uid
, usess
->gid
, pathname
, wait
,
5051 ret
= consumer_snapshot_channel(socket
,
5052 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5053 usess
->uid
, usess
->gid
, pathname
, wait
, max_stream_size
);
5061 case LTTNG_BUFFER_PER_PID
:
5063 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5064 struct consumer_socket
*socket
;
5065 struct lttng_ht_iter chan_iter
;
5066 struct ust_app_channel
*ua_chan
;
5067 struct ust_app_session
*ua_sess
;
5068 struct ust_registry_session
*registry
;
5070 ua_sess
= lookup_session_by_app(usess
, app
);
5072 /* Session not associated with this app. */
5076 /* Get the right consumer socket for the application. */
5077 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
5084 /* Add the UST default trace dir to path. */
5085 memset(pathname
, 0, sizeof(pathname
));
5086 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
5089 PERROR("snprintf snapshot path");
5093 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5094 ua_chan
, node
.node
) {
5095 ret
= consumer_snapshot_channel(socket
, ua_chan
->key
, output
,
5096 0, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
5103 registry
= get_session_registry(ua_sess
);
5105 ret
= consumer_snapshot_channel(socket
, registry
->metadata_key
, output
,
5106 1, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
5120 if (!snapshot_done
) {
5122 * If no snapshot was made and we are not in the error path, this means
5123 * that there are no buffers thus no (prior) application to snapshot
5124 * data from so we have simply NO data.
5135 * Return the number of streams for a UST session.
5137 unsigned int ust_app_get_nb_stream(struct ltt_ust_session
*usess
)
5139 unsigned int ret
= 0;
5140 struct ust_app
*app
;
5141 struct lttng_ht_iter iter
;
5145 switch (usess
->buffer_type
) {
5146 case LTTNG_BUFFER_PER_UID
:
5148 struct buffer_reg_uid
*reg
;
5150 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5151 struct buffer_reg_channel
*reg_chan
;
5153 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5154 reg_chan
, node
.node
) {
5155 ret
+= reg_chan
->stream_count
;
5160 case LTTNG_BUFFER_PER_PID
:
5163 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5164 struct ust_app_channel
*ua_chan
;
5165 struct ust_app_session
*ua_sess
;
5166 struct lttng_ht_iter chan_iter
;
5168 ua_sess
= lookup_session_by_app(usess
, app
);
5170 /* Session not associated with this app. */
5174 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5175 ua_chan
, node
.node
) {
5176 ret
+= ua_chan
->streams
.count
;