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"
44 int ust_app_flush_app_session(struct ust_app
*app
, struct ust_app_session
*ua_sess
);
46 /* Next available channel key. Access under next_channel_key_lock. */
47 static uint64_t _next_channel_key
;
48 static pthread_mutex_t next_channel_key_lock
= PTHREAD_MUTEX_INITIALIZER
;
50 /* Next available session ID. Access under next_session_id_lock. */
51 static uint64_t _next_session_id
;
52 static pthread_mutex_t next_session_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
55 * Return the incremented value of next_channel_key.
57 static uint64_t get_next_channel_key(void)
61 pthread_mutex_lock(&next_channel_key_lock
);
62 ret
= ++_next_channel_key
;
63 pthread_mutex_unlock(&next_channel_key_lock
);
68 * Return the atomically incremented value of next_session_id.
70 static uint64_t get_next_session_id(void)
74 pthread_mutex_lock(&next_session_id_lock
);
75 ret
= ++_next_session_id
;
76 pthread_mutex_unlock(&next_session_id_lock
);
80 static void copy_channel_attr_to_ustctl(
81 struct ustctl_consumer_channel_attr
*attr
,
82 struct lttng_ust_channel_attr
*uattr
)
84 /* Copy event attributes since the layout is different. */
85 attr
->subbuf_size
= uattr
->subbuf_size
;
86 attr
->num_subbuf
= uattr
->num_subbuf
;
87 attr
->overwrite
= uattr
->overwrite
;
88 attr
->switch_timer_interval
= uattr
->switch_timer_interval
;
89 attr
->read_timer_interval
= uattr
->read_timer_interval
;
90 attr
->output
= uattr
->output
;
94 * Match function for the hash table lookup.
96 * It matches an ust app event based on three attributes which are the event
97 * name, the filter bytecode and the loglevel.
99 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
101 struct ust_app_event
*event
;
102 const struct ust_app_ht_key
*key
;
107 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
110 /* Match the 4 elements of the key: name, filter, loglevel, exclusions */
113 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
117 /* Event loglevel. */
118 if (event
->attr
.loglevel
!= key
->loglevel
) {
119 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
120 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
122 * Match is accepted. This is because on event creation, the
123 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
124 * -1 are accepted for this loglevel type since 0 is the one set by
125 * the API when receiving an enable event.
132 /* One of the filters is NULL, fail. */
133 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
137 if (key
->filter
&& event
->filter
) {
138 /* Both filters exists, check length followed by the bytecode. */
139 if (event
->filter
->len
!= key
->filter
->len
||
140 memcmp(event
->filter
->data
, key
->filter
->data
,
141 event
->filter
->len
) != 0) {
146 /* One of the exclusions is NULL, fail. */
147 if ((key
->exclusion
&& !event
->exclusion
) || (!key
->exclusion
&& event
->exclusion
)) {
151 if (key
->exclusion
&& event
->exclusion
) {
152 /* Both exclusions exists, check count followed by the names. */
153 if (event
->exclusion
->count
!= key
->exclusion
->count
||
154 memcmp(event
->exclusion
->names
, key
->exclusion
->names
,
155 event
->exclusion
->count
* LTTNG_UST_SYM_NAME_LEN
) != 0) {
169 * Unique add of an ust app event in the given ht. This uses the custom
170 * ht_match_ust_app_event match function and the event name as hash.
172 static void add_unique_ust_app_event(struct ust_app_channel
*ua_chan
,
173 struct ust_app_event
*event
)
175 struct cds_lfht_node
*node_ptr
;
176 struct ust_app_ht_key key
;
180 assert(ua_chan
->events
);
183 ht
= ua_chan
->events
;
184 key
.name
= event
->attr
.name
;
185 key
.filter
= event
->filter
;
186 key
.loglevel
= event
->attr
.loglevel
;
187 key
.exclusion
= event
->exclusion
;
189 node_ptr
= cds_lfht_add_unique(ht
->ht
,
190 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
191 ht_match_ust_app_event
, &key
, &event
->node
.node
);
192 assert(node_ptr
== &event
->node
.node
);
196 * Close the notify socket from the given RCU head object. This MUST be called
197 * through a call_rcu().
199 static void close_notify_sock_rcu(struct rcu_head
*head
)
202 struct ust_app_notify_sock_obj
*obj
=
203 caa_container_of(head
, struct ust_app_notify_sock_obj
, head
);
205 /* Must have a valid fd here. */
206 assert(obj
->fd
>= 0);
208 ret
= close(obj
->fd
);
210 ERR("close notify sock %d RCU", obj
->fd
);
212 lttng_fd_put(LTTNG_FD_APPS
, 1);
218 * Return the session registry according to the buffer type of the given
221 * A registry per UID object MUST exists before calling this function or else
222 * it assert() if not found. RCU read side lock must be acquired.
224 static struct ust_registry_session
*get_session_registry(
225 struct ust_app_session
*ua_sess
)
227 struct ust_registry_session
*registry
= NULL
;
231 switch (ua_sess
->buffer_type
) {
232 case LTTNG_BUFFER_PER_PID
:
234 struct buffer_reg_pid
*reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
238 registry
= reg_pid
->registry
->reg
.ust
;
241 case LTTNG_BUFFER_PER_UID
:
243 struct buffer_reg_uid
*reg_uid
= buffer_reg_uid_find(
244 ua_sess
->tracing_id
, ua_sess
->bits_per_long
, ua_sess
->uid
);
248 registry
= reg_uid
->registry
->reg
.ust
;
260 * Delete ust context safely. RCU read lock must be held before calling
264 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
271 ret
= ustctl_release_object(sock
, ua_ctx
->obj
);
272 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
273 ERR("UST app sock %d release ctx obj handle %d failed with ret %d",
274 sock
, ua_ctx
->obj
->handle
, ret
);
282 * Delete ust app event safely. RCU read lock must be held before calling
286 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
292 free(ua_event
->filter
);
293 if (ua_event
->exclusion
!= NULL
)
294 free(ua_event
->exclusion
);
295 if (ua_event
->obj
!= NULL
) {
296 ret
= ustctl_release_object(sock
, ua_event
->obj
);
297 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
298 ERR("UST app sock %d release event obj failed with ret %d",
307 * Release ust data object of the given stream.
309 * Return 0 on success or else a negative value.
311 static int release_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
318 ret
= ustctl_release_object(sock
, stream
->obj
);
319 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
320 ERR("UST app sock %d release stream obj failed with ret %d",
323 lttng_fd_put(LTTNG_FD_APPS
, 2);
331 * Delete ust app stream safely. RCU read lock must be held before calling
335 void delete_ust_app_stream(int sock
, struct ust_app_stream
*stream
)
339 (void) release_ust_app_stream(sock
, stream
);
344 * We need to execute ht_destroy outside of RCU read-side critical
345 * section and outside of call_rcu thread, so we postpone its execution
346 * using ht_cleanup_push. It is simpler than to change the semantic of
347 * the many callers of delete_ust_app_session().
350 void delete_ust_app_channel_rcu(struct rcu_head
*head
)
352 struct ust_app_channel
*ua_chan
=
353 caa_container_of(head
, struct ust_app_channel
, rcu_head
);
355 ht_cleanup_push(ua_chan
->ctx
);
356 ht_cleanup_push(ua_chan
->events
);
361 * Delete ust app channel safely. RCU read lock must be held before calling
365 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
,
369 struct lttng_ht_iter iter
;
370 struct ust_app_event
*ua_event
;
371 struct ust_app_ctx
*ua_ctx
;
372 struct ust_app_stream
*stream
, *stmp
;
373 struct ust_registry_session
*registry
;
377 DBG3("UST app deleting channel %s", ua_chan
->name
);
380 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
381 cds_list_del(&stream
->list
);
382 delete_ust_app_stream(sock
, stream
);
386 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
387 cds_list_del(&ua_ctx
->list
);
388 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
390 delete_ust_app_ctx(sock
, ua_ctx
);
394 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
396 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
398 delete_ust_app_event(sock
, ua_event
);
401 if (ua_chan
->session
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
402 /* Wipe and free registry from session registry. */
403 registry
= get_session_registry(ua_chan
->session
);
405 ust_registry_channel_del_free(registry
, ua_chan
->key
);
409 if (ua_chan
->obj
!= NULL
) {
410 /* Remove channel from application UST object descriptor. */
411 iter
.iter
.node
= &ua_chan
->ust_objd_node
.node
;
412 ret
= lttng_ht_del(app
->ust_objd
, &iter
);
414 ret
= ustctl_release_object(sock
, ua_chan
->obj
);
415 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
416 ERR("UST app sock %d release channel obj failed with ret %d",
419 lttng_fd_put(LTTNG_FD_APPS
, 1);
422 call_rcu(&ua_chan
->rcu_head
, delete_ust_app_channel_rcu
);
426 * Push metadata to consumer socket.
428 * RCU read-side lock must be held to guarantee existance of socket.
429 * Must be called with the ust app session lock held.
430 * Must be called with the registry lock held.
432 * On success, return the len of metadata pushed or else a negative value.
434 ssize_t
ust_app_push_metadata(struct ust_registry_session
*registry
,
435 struct consumer_socket
*socket
, int send_zero_data
)
438 char *metadata_str
= NULL
;
446 * Means that no metadata was assigned to the session. This can
447 * happens if no start has been done previously.
449 if (!registry
->metadata_key
) {
454 * On a push metadata error either the consumer is dead or the
455 * metadata channel has been destroyed because its endpoint
456 * might have died (e.g: relayd). If so, the metadata closed
457 * flag is set to 1 so we deny pushing metadata again which is
458 * not valid anymore on the consumer side.
460 if (registry
->metadata_closed
) {
464 offset
= registry
->metadata_len_sent
;
465 len
= registry
->metadata_len
- registry
->metadata_len_sent
;
467 DBG3("No metadata to push for metadata key %" PRIu64
,
468 registry
->metadata_key
);
470 if (send_zero_data
) {
471 DBG("No metadata to push");
477 /* Allocate only what we have to send. */
478 metadata_str
= zmalloc(len
);
480 PERROR("zmalloc ust app metadata string");
484 /* Copy what we haven't send out. */
485 memcpy(metadata_str
, registry
->metadata
+ offset
, len
);
486 registry
->metadata_len_sent
+= len
;
489 ret
= consumer_push_metadata(socket
, registry
->metadata_key
,
490 metadata_str
, len
, offset
);
493 * There is an acceptable race here between the registry
494 * metadata key assignment and the creation on the
495 * consumer. The session daemon can concurrently push
496 * metadata for this registry while being created on the
497 * consumer since the metadata key of the registry is
498 * assigned *before* it is setup to avoid the consumer
499 * to ask for metadata that could possibly be not found
500 * in the session daemon.
502 * The metadata will get pushed either by the session
503 * being stopped or the consumer requesting metadata if
504 * that race is triggered.
506 if (ret
== -LTTCOMM_CONSUMERD_CHANNEL_FAIL
) {
511 * Update back the actual metadata len sent since it
514 registry
->metadata_len_sent
-= len
;
526 * On error, flag the registry that the metadata is
527 * closed. We were unable to push anything and this
528 * means that either the consumer is not responding or
529 * the metadata cache has been destroyed on the
532 registry
->metadata_closed
= 1;
540 * For a given application and session, push metadata to consumer.
541 * Either sock or consumer is required : if sock is NULL, the default
542 * socket to send the metadata is retrieved from consumer, if sock
543 * is not NULL we use it to send the metadata.
544 * RCU read-side lock must be held while calling this function,
545 * therefore ensuring existance of registry. It also ensures existance
546 * of socket throughout this function.
548 * Return 0 on success else a negative error.
550 static int push_metadata(struct ust_registry_session
*registry
,
551 struct consumer_output
*consumer
)
555 struct consumer_socket
*socket
;
560 pthread_mutex_lock(®istry
->lock
);
561 if (registry
->metadata_closed
) {
566 /* Get consumer socket to use to push the metadata.*/
567 socket
= consumer_find_socket_by_bitness(registry
->bits_per_long
,
574 ret
= ust_app_push_metadata(registry
, socket
, 0);
579 pthread_mutex_unlock(®istry
->lock
);
584 pthread_mutex_unlock(®istry
->lock
);
589 * Send to the consumer a close metadata command for the given session. Once
590 * done, the metadata channel is deleted and the session metadata pointer is
591 * nullified. The session lock MUST be held unless the application is
592 * in the destroy path.
594 * Return 0 on success else a negative value.
596 static int close_metadata(struct ust_registry_session
*registry
,
597 struct consumer_output
*consumer
)
600 struct consumer_socket
*socket
;
607 pthread_mutex_lock(®istry
->lock
);
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;
635 pthread_mutex_unlock(®istry
->lock
);
641 * We need to execute ht_destroy outside of RCU read-side critical
642 * section and outside of call_rcu thread, so we postpone its execution
643 * using ht_cleanup_push. It is simpler than to change the semantic of
644 * the many callers of delete_ust_app_session().
647 void delete_ust_app_session_rcu(struct rcu_head
*head
)
649 struct ust_app_session
*ua_sess
=
650 caa_container_of(head
, struct ust_app_session
, rcu_head
);
652 ht_cleanup_push(ua_sess
->channels
);
657 * Delete ust app session safely. RCU read lock must be held before calling
661 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
,
665 struct lttng_ht_iter iter
;
666 struct ust_app_channel
*ua_chan
;
667 struct ust_registry_session
*registry
;
671 pthread_mutex_lock(&ua_sess
->lock
);
673 registry
= get_session_registry(ua_sess
);
675 /* Push metadata for application before freeing the application. */
676 (void) push_metadata(registry
, ua_sess
->consumer
);
679 * Don't ask to close metadata for global per UID buffers. Close
680 * metadata only on destroy trace session in this case. Also, the
681 * previous push metadata could have flag the metadata registry to
682 * close so don't send a close command if closed.
684 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
685 /* 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. */
1475 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1478 * If we hit an EPERM, something is wrong with our disable call. If
1479 * we get an EEXIST, there is a problem on the tracer side since we
1483 case -LTTNG_UST_ERR_PERM
:
1484 /* Code flow problem */
1486 case -LTTNG_UST_ERR_EXIST
:
1487 /* It's OK for our use case. */
1498 health_code_update();
1503 * Copy data between an UST app event and a LTT event.
1505 static void shadow_copy_event(struct ust_app_event
*ua_event
,
1506 struct ltt_ust_event
*uevent
)
1508 size_t exclusion_alloc_size
;
1510 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
1511 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
1513 ua_event
->enabled
= uevent
->enabled
;
1515 /* Copy event attributes */
1516 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
1518 /* Copy filter bytecode */
1519 if (uevent
->filter
) {
1520 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
1521 /* Filter might be NULL here in case of ENONEM. */
1524 /* Copy exclusion data */
1525 if (uevent
->exclusion
) {
1526 exclusion_alloc_size
= sizeof(struct lttng_ust_event_exclusion
) +
1527 LTTNG_UST_SYM_NAME_LEN
* uevent
->exclusion
->count
;
1528 ua_event
->exclusion
= zmalloc(exclusion_alloc_size
);
1529 if (ua_event
->exclusion
== NULL
) {
1532 memcpy(ua_event
->exclusion
, uevent
->exclusion
,
1533 exclusion_alloc_size
);
1539 * Copy data between an UST app channel and a LTT channel.
1541 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
1542 struct ltt_ust_channel
*uchan
)
1544 struct lttng_ht_iter iter
;
1545 struct ltt_ust_event
*uevent
;
1546 struct ltt_ust_context
*uctx
;
1547 struct ust_app_event
*ua_event
;
1548 struct ust_app_ctx
*ua_ctx
;
1550 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
1552 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
1553 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
1555 ua_chan
->tracefile_size
= uchan
->tracefile_size
;
1556 ua_chan
->tracefile_count
= uchan
->tracefile_count
;
1558 /* Copy event attributes since the layout is different. */
1559 ua_chan
->attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1560 ua_chan
->attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1561 ua_chan
->attr
.overwrite
= uchan
->attr
.overwrite
;
1562 ua_chan
->attr
.switch_timer_interval
= uchan
->attr
.switch_timer_interval
;
1563 ua_chan
->attr
.read_timer_interval
= uchan
->attr
.read_timer_interval
;
1564 ua_chan
->attr
.output
= uchan
->attr
.output
;
1566 * Note that the attribute channel type is not set since the channel on the
1567 * tracing registry side does not have this information.
1570 ua_chan
->enabled
= uchan
->enabled
;
1571 ua_chan
->tracing_channel_id
= uchan
->id
;
1573 cds_list_for_each_entry(uctx
, &uchan
->ctx_list
, list
) {
1574 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
1575 if (ua_ctx
== NULL
) {
1578 lttng_ht_node_init_ulong(&ua_ctx
->node
,
1579 (unsigned long) ua_ctx
->ctx
.ctx
);
1580 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1581 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
1584 /* Copy all events from ltt ust channel to ust app channel */
1585 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
1586 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1587 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
1588 if (ua_event
== NULL
) {
1589 DBG2("UST event %s not found on shadow copy channel",
1591 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1592 if (ua_event
== NULL
) {
1595 shadow_copy_event(ua_event
, uevent
);
1596 add_unique_ust_app_event(ua_chan
, ua_event
);
1600 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
1604 * Copy data between a UST app session and a regular LTT session.
1606 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
1607 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1609 struct lttng_ht_node_str
*ua_chan_node
;
1610 struct lttng_ht_iter iter
;
1611 struct ltt_ust_channel
*uchan
;
1612 struct ust_app_channel
*ua_chan
;
1614 struct tm
*timeinfo
;
1618 /* Get date and time for unique app path */
1620 timeinfo
= localtime(&rawtime
);
1621 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1623 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1625 ua_sess
->tracing_id
= usess
->id
;
1626 ua_sess
->id
= get_next_session_id();
1627 ua_sess
->uid
= app
->uid
;
1628 ua_sess
->gid
= app
->gid
;
1629 ua_sess
->euid
= usess
->uid
;
1630 ua_sess
->egid
= usess
->gid
;
1631 ua_sess
->buffer_type
= usess
->buffer_type
;
1632 ua_sess
->bits_per_long
= app
->bits_per_long
;
1633 /* There is only one consumer object per session possible. */
1634 ua_sess
->consumer
= usess
->consumer
;
1635 ua_sess
->output_traces
= usess
->output_traces
;
1636 ua_sess
->live_timer_interval
= usess
->live_timer_interval
;
1637 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
,
1638 &usess
->metadata_attr
);
1640 switch (ua_sess
->buffer_type
) {
1641 case LTTNG_BUFFER_PER_PID
:
1642 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1643 DEFAULT_UST_TRACE_PID_PATH
"/%s-%d-%s", app
->name
, app
->pid
,
1646 case LTTNG_BUFFER_PER_UID
:
1647 ret
= snprintf(ua_sess
->path
, sizeof(ua_sess
->path
),
1648 DEFAULT_UST_TRACE_UID_PATH
, ua_sess
->uid
, app
->bits_per_long
);
1655 PERROR("asprintf UST shadow copy session");
1660 /* Iterate over all channels in global domain. */
1661 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1663 struct lttng_ht_iter uiter
;
1665 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1666 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1667 if (ua_chan_node
!= NULL
) {
1668 /* Session exist. Contiuing. */
1672 DBG2("Channel %s not found on shadow session copy, creating it",
1674 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
1675 if (ua_chan
== NULL
) {
1676 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1679 shadow_copy_channel(ua_chan
, uchan
);
1681 * The concept of metadata channel does not exist on the tracing
1682 * registry side of the session daemon so this can only be a per CPU
1683 * channel and not metadata.
1685 ua_chan
->attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1687 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1695 * Lookup sesison wrapper.
1698 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1699 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1701 /* Get right UST app session from app */
1702 lttng_ht_lookup(app
->sessions
, &usess
->id
, iter
);
1706 * Return ust app session from the app session hashtable using the UST session
1709 static struct ust_app_session
*lookup_session_by_app(
1710 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1712 struct lttng_ht_iter iter
;
1713 struct lttng_ht_node_u64
*node
;
1715 __lookup_session_by_app(usess
, app
, &iter
);
1716 node
= lttng_ht_iter_get_node_u64(&iter
);
1721 return caa_container_of(node
, struct ust_app_session
, node
);
1728 * Setup buffer registry per PID for the given session and application. If none
1729 * is found, a new one is created, added to the global registry and
1730 * initialized. If regp is valid, it's set with the newly created object.
1732 * Return 0 on success or else a negative value.
1734 static int setup_buffer_reg_pid(struct ust_app_session
*ua_sess
,
1735 struct ust_app
*app
, struct buffer_reg_pid
**regp
)
1738 struct buffer_reg_pid
*reg_pid
;
1745 reg_pid
= buffer_reg_pid_find(ua_sess
->id
);
1748 * This is the create channel path meaning that if there is NO
1749 * registry available, we have to create one for this session.
1751 ret
= buffer_reg_pid_create(ua_sess
->id
, ®_pid
);
1755 buffer_reg_pid_add(reg_pid
);
1760 /* Initialize registry. */
1761 ret
= ust_registry_session_init(®_pid
->registry
->reg
.ust
, app
,
1762 app
->bits_per_long
, app
->uint8_t_alignment
,
1763 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1764 app
->uint64_t_alignment
, app
->long_alignment
,
1765 app
->byte_order
, app
->version
.major
,
1766 app
->version
.minor
);
1771 DBG3("UST app buffer registry per PID created successfully");
1783 * Setup buffer registry per UID for the given session and application. If none
1784 * is found, a new one is created, added to the global registry and
1785 * initialized. If regp is valid, it's set with the newly created object.
1787 * Return 0 on success or else a negative value.
1789 static int setup_buffer_reg_uid(struct ltt_ust_session
*usess
,
1790 struct ust_app
*app
, struct buffer_reg_uid
**regp
)
1793 struct buffer_reg_uid
*reg_uid
;
1800 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
1803 * This is the create channel path meaning that if there is NO
1804 * registry available, we have to create one for this session.
1806 ret
= buffer_reg_uid_create(usess
->id
, app
->bits_per_long
, app
->uid
,
1807 LTTNG_DOMAIN_UST
, ®_uid
);
1811 buffer_reg_uid_add(reg_uid
);
1816 /* Initialize registry. */
1817 ret
= ust_registry_session_init(®_uid
->registry
->reg
.ust
, NULL
,
1818 app
->bits_per_long
, app
->uint8_t_alignment
,
1819 app
->uint16_t_alignment
, app
->uint32_t_alignment
,
1820 app
->uint64_t_alignment
, app
->long_alignment
,
1821 app
->byte_order
, app
->version
.major
,
1822 app
->version
.minor
);
1826 /* Add node to teardown list of the session. */
1827 cds_list_add(®_uid
->lnode
, &usess
->buffer_reg_uid_list
);
1829 DBG3("UST app buffer registry per UID created successfully");
1841 * Create a session on the tracer side for the given app.
1843 * On success, ua_sess_ptr is populated with the session pointer or else left
1844 * untouched. If the session was created, is_created is set to 1. On error,
1845 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1848 * Returns 0 on success or else a negative code which is either -ENOMEM or
1849 * -ENOTCONN which is the default code if the ustctl_create_session fails.
1851 static int create_ust_app_session(struct ltt_ust_session
*usess
,
1852 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
1855 int ret
, created
= 0;
1856 struct ust_app_session
*ua_sess
;
1860 assert(ua_sess_ptr
);
1862 health_code_update();
1864 ua_sess
= lookup_session_by_app(usess
, app
);
1865 if (ua_sess
== NULL
) {
1866 DBG2("UST app pid: %d session id %" PRIu64
" not found, creating it",
1867 app
->pid
, usess
->id
);
1868 ua_sess
= alloc_ust_app_session(app
);
1869 if (ua_sess
== NULL
) {
1870 /* Only malloc can failed so something is really wrong */
1874 shadow_copy_session(ua_sess
, usess
, app
);
1878 switch (usess
->buffer_type
) {
1879 case LTTNG_BUFFER_PER_PID
:
1880 /* Init local registry. */
1881 ret
= setup_buffer_reg_pid(ua_sess
, app
, NULL
);
1886 case LTTNG_BUFFER_PER_UID
:
1887 /* Look for a global registry. If none exists, create one. */
1888 ret
= setup_buffer_reg_uid(usess
, app
, NULL
);
1899 health_code_update();
1901 if (ua_sess
->handle
== -1) {
1902 ret
= ustctl_create_session(app
->sock
);
1904 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
1905 ERR("Creating session for app pid %d with ret %d",
1908 DBG("UST app creating session failed. Application is dead");
1910 * This is normal behavior, an application can die during the
1911 * creation process. Don't report an error so the execution can
1912 * continue normally. This will get flagged ENOTCONN and the
1913 * caller will handle it.
1917 delete_ust_app_session(-1, ua_sess
, app
);
1918 if (ret
!= -ENOMEM
) {
1920 * Tracer is probably gone or got an internal error so let's
1921 * behave like it will soon unregister or not usable.
1928 ua_sess
->handle
= ret
;
1930 /* Add ust app session to app's HT */
1931 lttng_ht_node_init_u64(&ua_sess
->node
,
1932 ua_sess
->tracing_id
);
1933 lttng_ht_add_unique_u64(app
->sessions
, &ua_sess
->node
);
1935 DBG2("UST app session created successfully with handle %d", ret
);
1938 *ua_sess_ptr
= ua_sess
;
1940 *is_created
= created
;
1943 /* Everything went well. */
1947 health_code_update();
1952 * Match function for a hash table lookup of ust_app_ctx.
1954 * It matches an ust app context based on the context type and, in the case
1955 * of perf counters, their name.
1957 static int ht_match_ust_app_ctx(struct cds_lfht_node
*node
, const void *_key
)
1959 struct ust_app_ctx
*ctx
;
1960 const struct lttng_ust_context
*key
;
1965 ctx
= caa_container_of(node
, struct ust_app_ctx
, node
.node
);
1969 if (ctx
->ctx
.ctx
!= key
->ctx
) {
1973 /* Check the name in the case of perf thread counters. */
1974 if (key
->ctx
== LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER
) {
1975 if (strncmp(key
->u
.perf_counter
.name
,
1976 ctx
->ctx
.u
.perf_counter
.name
,
1977 sizeof(key
->u
.perf_counter
.name
))) {
1990 * Lookup for an ust app context from an lttng_ust_context.
1992 * Must be called while holding RCU read side lock.
1993 * Return an ust_app_ctx object or NULL on error.
1996 struct ust_app_ctx
*find_ust_app_context(struct lttng_ht
*ht
,
1997 struct lttng_ust_context
*uctx
)
1999 struct lttng_ht_iter iter
;
2000 struct lttng_ht_node_ulong
*node
;
2001 struct ust_app_ctx
*app_ctx
= NULL
;
2006 /* Lookup using the lttng_ust_context_type and a custom match fct. */
2007 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) uctx
->ctx
, lttng_ht_seed
),
2008 ht_match_ust_app_ctx
, uctx
, &iter
.iter
);
2009 node
= lttng_ht_iter_get_node_ulong(&iter
);
2014 app_ctx
= caa_container_of(node
, struct ust_app_ctx
, node
);
2021 * Create a context for the channel on the tracer.
2023 * Called with UST app session lock held and a RCU read side lock.
2026 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
2027 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
2028 struct ust_app
*app
)
2031 struct ust_app_ctx
*ua_ctx
;
2033 DBG2("UST app adding context to channel %s", ua_chan
->name
);
2035 ua_ctx
= find_ust_app_context(ua_chan
->ctx
, uctx
);
2041 ua_ctx
= alloc_ust_app_ctx(uctx
);
2042 if (ua_ctx
== NULL
) {
2048 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
2049 lttng_ht_add_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
2050 cds_list_add_tail(&ua_ctx
->list
, &ua_chan
->ctx_list
);
2052 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2062 * Enable on the tracer side a ust app event for the session and channel.
2064 * Called with UST app session lock held.
2067 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
2068 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2072 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
2077 ua_event
->enabled
= 1;
2084 * Disable on the tracer side a ust app event for the session and channel.
2086 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
2087 struct ust_app_event
*ua_event
, struct ust_app
*app
)
2091 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
2096 ua_event
->enabled
= 0;
2103 * Lookup ust app channel for session and disable it on the tracer side.
2106 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
2107 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
2111 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2116 ua_chan
->enabled
= 0;
2123 * Lookup ust app channel for session and enable it on the tracer side. This
2124 * MUST be called with a RCU read side lock acquired.
2126 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
2127 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
2130 struct lttng_ht_iter iter
;
2131 struct lttng_ht_node_str
*ua_chan_node
;
2132 struct ust_app_channel
*ua_chan
;
2134 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2135 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2136 if (ua_chan_node
== NULL
) {
2137 DBG2("Unable to find channel %s in ust session id %" PRIu64
,
2138 uchan
->name
, ua_sess
->tracing_id
);
2142 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2144 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
2154 * Ask the consumer to create a channel and get it if successful.
2156 * Return 0 on success or else a negative value.
2158 static int do_consumer_create_channel(struct ltt_ust_session
*usess
,
2159 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
2160 int bitness
, struct ust_registry_session
*registry
)
2163 unsigned int nb_fd
= 0;
2164 struct consumer_socket
*socket
;
2172 health_code_update();
2174 /* Get the right consumer socket for the application. */
2175 socket
= consumer_find_socket_by_bitness(bitness
, usess
->consumer
);
2181 health_code_update();
2183 /* Need one fd for the channel. */
2184 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2186 ERR("Exhausted number of available FD upon create channel");
2191 * Ask consumer to create channel. The consumer will return the number of
2192 * stream we have to expect.
2194 ret
= ust_consumer_ask_channel(ua_sess
, ua_chan
, usess
->consumer
, socket
,
2201 * Compute the number of fd needed before receiving them. It must be 2 per
2202 * stream (2 being the default value here).
2204 nb_fd
= DEFAULT_UST_STREAM_FD_NUM
* ua_chan
->expected_stream_count
;
2206 /* Reserve the amount of file descriptor we need. */
2207 ret
= lttng_fd_get(LTTNG_FD_APPS
, nb_fd
);
2209 ERR("Exhausted number of available FD upon create channel");
2210 goto error_fd_get_stream
;
2213 health_code_update();
2216 * Now get the channel from the consumer. This call wil populate the stream
2217 * list of that channel and set the ust objects.
2219 if (usess
->consumer
->enabled
) {
2220 ret
= ust_consumer_get_channel(socket
, ua_chan
);
2230 lttng_fd_put(LTTNG_FD_APPS
, nb_fd
);
2231 error_fd_get_stream
:
2233 * Initiate a destroy channel on the consumer since we had an error
2234 * handling it on our side. The return value is of no importance since we
2235 * already have a ret value set by the previous error that we need to
2238 (void) ust_consumer_destroy_channel(socket
, ua_chan
);
2240 lttng_fd_put(LTTNG_FD_APPS
, 1);
2242 health_code_update();
2248 * Duplicate the ust data object of the ust app stream and save it in the
2249 * buffer registry stream.
2251 * Return 0 on success or else a negative value.
2253 static int duplicate_stream_object(struct buffer_reg_stream
*reg_stream
,
2254 struct ust_app_stream
*stream
)
2261 /* Reserve the amount of file descriptor we need. */
2262 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2264 ERR("Exhausted number of available FD upon duplicate stream");
2268 /* Duplicate object for stream once the original is in the registry. */
2269 ret
= ustctl_duplicate_ust_object_data(&stream
->obj
,
2270 reg_stream
->obj
.ust
);
2272 ERR("Duplicate stream obj from %p to %p failed with ret %d",
2273 reg_stream
->obj
.ust
, stream
->obj
, ret
);
2274 lttng_fd_put(LTTNG_FD_APPS
, 2);
2277 stream
->handle
= stream
->obj
->handle
;
2284 * Duplicate the ust data object of the ust app. channel and save it in the
2285 * buffer registry channel.
2287 * Return 0 on success or else a negative value.
2289 static int duplicate_channel_object(struct buffer_reg_channel
*reg_chan
,
2290 struct ust_app_channel
*ua_chan
)
2297 /* Need two fds for the channel. */
2298 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2300 ERR("Exhausted number of available FD upon duplicate channel");
2304 /* Duplicate object for stream once the original is in the registry. */
2305 ret
= ustctl_duplicate_ust_object_data(&ua_chan
->obj
, reg_chan
->obj
.ust
);
2307 ERR("Duplicate channel obj from %p to %p failed with ret: %d",
2308 reg_chan
->obj
.ust
, ua_chan
->obj
, ret
);
2311 ua_chan
->handle
= ua_chan
->obj
->handle
;
2316 lttng_fd_put(LTTNG_FD_APPS
, 1);
2322 * For a given channel buffer registry, setup all streams of the given ust
2323 * application channel.
2325 * Return 0 on success or else a negative value.
2327 static int setup_buffer_reg_streams(struct buffer_reg_channel
*reg_chan
,
2328 struct ust_app_channel
*ua_chan
)
2331 struct ust_app_stream
*stream
, *stmp
;
2336 DBG2("UST app setup buffer registry stream");
2338 /* Send all streams to application. */
2339 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
2340 struct buffer_reg_stream
*reg_stream
;
2342 ret
= buffer_reg_stream_create(®_stream
);
2348 * Keep original pointer and nullify it in the stream so the delete
2349 * stream call does not release the object.
2351 reg_stream
->obj
.ust
= stream
->obj
;
2353 buffer_reg_stream_add(reg_stream
, reg_chan
);
2355 /* We don't need the streams anymore. */
2356 cds_list_del(&stream
->list
);
2357 delete_ust_app_stream(-1, stream
);
2365 * Create a buffer registry channel for the given session registry and
2366 * application channel object. If regp pointer is valid, it's set with the
2367 * created object. Important, the created object is NOT added to the session
2368 * registry hash table.
2370 * Return 0 on success else a negative value.
2372 static int create_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2373 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
**regp
)
2376 struct buffer_reg_channel
*reg_chan
= NULL
;
2381 DBG2("UST app creating buffer registry channel for %s", ua_chan
->name
);
2383 /* Create buffer registry channel. */
2384 ret
= buffer_reg_channel_create(ua_chan
->tracing_channel_id
, ®_chan
);
2389 reg_chan
->consumer_key
= ua_chan
->key
;
2390 reg_chan
->subbuf_size
= ua_chan
->attr
.subbuf_size
;
2391 reg_chan
->num_subbuf
= ua_chan
->attr
.num_subbuf
;
2393 /* Create and add a channel registry to session. */
2394 ret
= ust_registry_channel_add(reg_sess
->reg
.ust
,
2395 ua_chan
->tracing_channel_id
);
2399 buffer_reg_channel_add(reg_sess
, reg_chan
);
2408 /* Safe because the registry channel object was not added to any HT. */
2409 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2415 * Setup buffer registry channel for the given session registry and application
2416 * channel object. If regp pointer is valid, it's set with the created object.
2418 * Return 0 on success else a negative value.
2420 static int setup_buffer_reg_channel(struct buffer_reg_session
*reg_sess
,
2421 struct ust_app_channel
*ua_chan
, struct buffer_reg_channel
*reg_chan
)
2428 assert(ua_chan
->obj
);
2430 DBG2("UST app setup buffer registry channel for %s", ua_chan
->name
);
2432 /* Setup all streams for the registry. */
2433 ret
= setup_buffer_reg_streams(reg_chan
, ua_chan
);
2438 reg_chan
->obj
.ust
= ua_chan
->obj
;
2439 ua_chan
->obj
= NULL
;
2444 buffer_reg_channel_remove(reg_sess
, reg_chan
);
2445 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2450 * Send buffer registry channel to the application.
2452 * Return 0 on success else a negative value.
2454 static int send_channel_uid_to_ust(struct buffer_reg_channel
*reg_chan
,
2455 struct ust_app
*app
, struct ust_app_session
*ua_sess
,
2456 struct ust_app_channel
*ua_chan
)
2459 struct buffer_reg_stream
*reg_stream
;
2466 DBG("UST app sending buffer registry channel to ust sock %d", app
->sock
);
2468 ret
= duplicate_channel_object(reg_chan
, ua_chan
);
2473 /* Send channel to the application. */
2474 ret
= ust_consumer_send_channel_to_ust(app
, ua_sess
, ua_chan
);
2479 health_code_update();
2481 /* Send all streams to application. */
2482 pthread_mutex_lock(®_chan
->stream_list_lock
);
2483 cds_list_for_each_entry(reg_stream
, ®_chan
->streams
, lnode
) {
2484 struct ust_app_stream stream
;
2486 ret
= duplicate_stream_object(reg_stream
, &stream
);
2488 goto error_stream_unlock
;
2491 ret
= ust_consumer_send_stream_to_ust(app
, ua_chan
, &stream
);
2493 (void) release_ust_app_stream(-1, &stream
);
2494 goto error_stream_unlock
;
2498 * The return value is not important here. This function will output an
2501 (void) release_ust_app_stream(-1, &stream
);
2503 ua_chan
->is_sent
= 1;
2505 error_stream_unlock
:
2506 pthread_mutex_unlock(®_chan
->stream_list_lock
);
2512 * Create and send to the application the created buffers with per UID buffers.
2514 * Return 0 on success else a negative value.
2516 static int create_channel_per_uid(struct ust_app
*app
,
2517 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2518 struct ust_app_channel
*ua_chan
)
2521 struct buffer_reg_uid
*reg_uid
;
2522 struct buffer_reg_channel
*reg_chan
;
2529 DBG("UST app creating channel %s with per UID buffers", ua_chan
->name
);
2531 reg_uid
= buffer_reg_uid_find(usess
->id
, app
->bits_per_long
, app
->uid
);
2533 * The session creation handles the creation of this global registry
2534 * object. If none can be find, there is a code flow problem or a
2539 reg_chan
= buffer_reg_channel_find(ua_chan
->tracing_channel_id
,
2542 /* Create the buffer registry channel object. */
2543 ret
= create_buffer_reg_channel(reg_uid
->registry
, ua_chan
, ®_chan
);
2545 ERR("Error creating the UST channel \"%s\" registry instance",
2552 * Create the buffers on the consumer side. This call populates the
2553 * ust app channel object with all streams and data object.
2555 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2556 app
->bits_per_long
, reg_uid
->registry
->reg
.ust
);
2558 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2562 * Let's remove the previously created buffer registry channel so
2563 * it's not visible anymore in the session registry.
2565 ust_registry_channel_del_free(reg_uid
->registry
->reg
.ust
,
2566 ua_chan
->tracing_channel_id
);
2567 buffer_reg_channel_remove(reg_uid
->registry
, reg_chan
);
2568 buffer_reg_channel_destroy(reg_chan
, LTTNG_DOMAIN_UST
);
2573 * Setup the streams and add it to the session registry.
2575 ret
= setup_buffer_reg_channel(reg_uid
->registry
, ua_chan
, reg_chan
);
2577 ERR("Error setting up UST channel \"%s\"",
2584 /* Send buffers to the application. */
2585 ret
= send_channel_uid_to_ust(reg_chan
, app
, ua_sess
, ua_chan
);
2588 * Don't report error to the console, since it may be
2589 * caused by application concurrently exiting.
2599 * Create and send to the application the created buffers with per PID buffers.
2601 * Return 0 on success else a negative value.
2603 static int create_channel_per_pid(struct ust_app
*app
,
2604 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2605 struct ust_app_channel
*ua_chan
)
2608 struct ust_registry_session
*registry
;
2615 DBG("UST app creating channel %s with per PID buffers", ua_chan
->name
);
2619 registry
= get_session_registry(ua_sess
);
2622 /* Create and add a new channel registry to session. */
2623 ret
= ust_registry_channel_add(registry
, ua_chan
->key
);
2625 ERR("Error creating the UST channel \"%s\" registry instance",
2630 /* Create and get channel on the consumer side. */
2631 ret
= do_consumer_create_channel(usess
, ua_sess
, ua_chan
,
2632 app
->bits_per_long
, registry
);
2634 ERR("Error creating UST channel \"%s\" on the consumer daemon",
2639 ret
= send_channel_pid_to_ust(app
, ua_sess
, ua_chan
);
2642 * Don't report error to the console, since it may be
2643 * caused by application concurrently exiting.
2654 * From an already allocated ust app channel, create the channel buffers if
2655 * need and send it to the application. This MUST be called with a RCU read
2656 * side lock acquired.
2658 * Return 0 on success or else a negative value.
2660 static int do_create_channel(struct ust_app
*app
,
2661 struct ltt_ust_session
*usess
, struct ust_app_session
*ua_sess
,
2662 struct ust_app_channel
*ua_chan
)
2671 /* Handle buffer type before sending the channel to the application. */
2672 switch (usess
->buffer_type
) {
2673 case LTTNG_BUFFER_PER_UID
:
2675 ret
= create_channel_per_uid(app
, usess
, ua_sess
, ua_chan
);
2681 case LTTNG_BUFFER_PER_PID
:
2683 ret
= create_channel_per_pid(app
, usess
, ua_sess
, ua_chan
);
2695 /* Initialize ust objd object using the received handle and add it. */
2696 lttng_ht_node_init_ulong(&ua_chan
->ust_objd_node
, ua_chan
->handle
);
2697 lttng_ht_add_unique_ulong(app
->ust_objd
, &ua_chan
->ust_objd_node
);
2699 /* If channel is not enabled, disable it on the tracer */
2700 if (!ua_chan
->enabled
) {
2701 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
2712 * Create UST app channel and create it on the tracer. Set ua_chanp of the
2713 * newly created channel if not NULL.
2715 * Called with UST app session lock and RCU read-side lock held.
2717 * Return 0 on success or else a negative value.
2719 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
2720 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
2721 enum lttng_ust_chan_type type
, struct ltt_ust_session
*usess
,
2722 struct ust_app_channel
**ua_chanp
)
2725 struct lttng_ht_iter iter
;
2726 struct lttng_ht_node_str
*ua_chan_node
;
2727 struct ust_app_channel
*ua_chan
;
2729 /* Lookup channel in the ust app session */
2730 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2731 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2732 if (ua_chan_node
!= NULL
) {
2733 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2737 ua_chan
= alloc_ust_app_channel(uchan
->name
, ua_sess
, &uchan
->attr
);
2738 if (ua_chan
== NULL
) {
2739 /* Only malloc can fail here */
2743 shadow_copy_channel(ua_chan
, uchan
);
2745 /* Set channel type. */
2746 ua_chan
->attr
.type
= type
;
2748 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
2753 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
2756 /* Only add the channel if successful on the tracer side. */
2757 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
2761 *ua_chanp
= ua_chan
;
2764 /* Everything went well. */
2768 delete_ust_app_channel(ua_chan
->is_sent
? app
->sock
: -1, ua_chan
, app
);
2774 * Create UST app event and create it on the tracer side.
2776 * Called with ust app session mutex held.
2779 int create_ust_app_event(struct ust_app_session
*ua_sess
,
2780 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
2781 struct ust_app
*app
)
2784 struct ust_app_event
*ua_event
;
2786 /* Get event node */
2787 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2788 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
2789 if (ua_event
!= NULL
) {
2794 /* Does not exist so create one */
2795 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
2796 if (ua_event
== NULL
) {
2797 /* Only malloc can failed so something is really wrong */
2801 shadow_copy_event(ua_event
, uevent
);
2803 /* Create it on the tracer side */
2804 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2806 /* Not found previously means that it does not exist on the tracer */
2807 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
2811 add_unique_ust_app_event(ua_chan
, ua_event
);
2813 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
2820 /* Valid. Calling here is already in a read side lock */
2821 delete_ust_app_event(-1, ua_event
);
2826 * Create UST metadata and open it on the tracer side.
2828 * Called with UST app session lock held and RCU read side lock.
2830 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
2831 struct ust_app
*app
, struct consumer_output
*consumer
)
2834 struct ust_app_channel
*metadata
;
2835 struct consumer_socket
*socket
;
2836 struct ust_registry_session
*registry
;
2842 registry
= get_session_registry(ua_sess
);
2845 pthread_mutex_lock(®istry
->lock
);
2847 /* Metadata already exists for this registry or it was closed previously */
2848 if (registry
->metadata_key
|| registry
->metadata_closed
) {
2853 /* Allocate UST metadata */
2854 metadata
= alloc_ust_app_channel(DEFAULT_METADATA_NAME
, ua_sess
, NULL
);
2856 /* malloc() failed */
2861 memcpy(&metadata
->attr
, &ua_sess
->metadata_attr
, sizeof(metadata
->attr
));
2863 /* Need one fd for the channel. */
2864 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2866 ERR("Exhausted number of available FD upon create metadata");
2870 /* Get the right consumer socket for the application. */
2871 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
, consumer
);
2874 goto error_consumer
;
2878 * Keep metadata key so we can identify it on the consumer side. Assign it
2879 * to the registry *before* we ask the consumer so we avoid the race of the
2880 * consumer requesting the metadata and the ask_channel call on our side
2881 * did not returned yet.
2883 registry
->metadata_key
= metadata
->key
;
2886 * Ask the metadata channel creation to the consumer. The metadata object
2887 * will be created by the consumer and kept their. However, the stream is
2888 * never added or monitored until we do a first push metadata to the
2891 ret
= ust_consumer_ask_channel(ua_sess
, metadata
, consumer
, socket
,
2894 /* Nullify the metadata key so we don't try to close it later on. */
2895 registry
->metadata_key
= 0;
2896 goto error_consumer
;
2900 * The setup command will make the metadata stream be sent to the relayd,
2901 * if applicable, and the thread managing the metadatas. This is important
2902 * because after this point, if an error occurs, the only way the stream
2903 * can be deleted is to be monitored in the consumer.
2905 ret
= consumer_setup_metadata(socket
, metadata
->key
);
2907 /* Nullify the metadata key so we don't try to close it later on. */
2908 registry
->metadata_key
= 0;
2909 goto error_consumer
;
2912 DBG2("UST metadata with key %" PRIu64
" created for app pid %d",
2913 metadata
->key
, app
->pid
);
2916 lttng_fd_put(LTTNG_FD_APPS
, 1);
2917 delete_ust_app_channel(-1, metadata
, app
);
2919 pthread_mutex_unlock(®istry
->lock
);
2924 * Return ust app pointer or NULL if not found. RCU read side lock MUST be
2925 * acquired before calling this function.
2927 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
2929 struct ust_app
*app
= NULL
;
2930 struct lttng_ht_node_ulong
*node
;
2931 struct lttng_ht_iter iter
;
2933 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
2934 node
= lttng_ht_iter_get_node_ulong(&iter
);
2936 DBG2("UST app no found with pid %d", pid
);
2940 DBG2("Found UST app by pid %d", pid
);
2942 app
= caa_container_of(node
, struct ust_app
, pid_n
);
2949 * Allocate and init an UST app object using the registration information and
2950 * the command socket. This is called when the command socket connects to the
2953 * The object is returned on success or else NULL.
2955 struct ust_app
*ust_app_create(struct ust_register_msg
*msg
, int sock
)
2957 struct ust_app
*lta
= NULL
;
2962 DBG3("UST app creating application for socket %d", sock
);
2964 if ((msg
->bits_per_long
== 64 &&
2965 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
2966 || (msg
->bits_per_long
== 32 &&
2967 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
2968 ERR("Registration failed: application \"%s\" (pid: %d) has "
2969 "%d-bit long, but no consumerd for this size is available.\n",
2970 msg
->name
, msg
->pid
, msg
->bits_per_long
);
2974 lta
= zmalloc(sizeof(struct ust_app
));
2980 lta
->ppid
= msg
->ppid
;
2981 lta
->uid
= msg
->uid
;
2982 lta
->gid
= msg
->gid
;
2984 lta
->bits_per_long
= msg
->bits_per_long
;
2985 lta
->uint8_t_alignment
= msg
->uint8_t_alignment
;
2986 lta
->uint16_t_alignment
= msg
->uint16_t_alignment
;
2987 lta
->uint32_t_alignment
= msg
->uint32_t_alignment
;
2988 lta
->uint64_t_alignment
= msg
->uint64_t_alignment
;
2989 lta
->long_alignment
= msg
->long_alignment
;
2990 lta
->byte_order
= msg
->byte_order
;
2992 lta
->v_major
= msg
->major
;
2993 lta
->v_minor
= msg
->minor
;
2994 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2995 lta
->ust_objd
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2996 lta
->notify_sock
= -1;
2998 /* Copy name and make sure it's NULL terminated. */
2999 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
3000 lta
->name
[UST_APP_PROCNAME_LEN
] = '\0';
3003 * Before this can be called, when receiving the registration information,
3004 * the application compatibility is checked. So, at this point, the
3005 * application can work with this session daemon.
3007 lta
->compatible
= 1;
3009 lta
->pid
= msg
->pid
;
3010 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long) lta
->pid
);
3012 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long) lta
->sock
);
3014 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
3021 * For a given application object, add it to every hash table.
3023 void ust_app_add(struct ust_app
*app
)
3026 assert(app
->notify_sock
>= 0);
3031 * On a re-registration, we want to kick out the previous registration of
3034 lttng_ht_add_replace_ulong(ust_app_ht
, &app
->pid_n
);
3037 * The socket _should_ be unique until _we_ call close. So, a add_unique
3038 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
3039 * already in the table.
3041 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, &app
->sock_n
);
3043 /* Add application to the notify socket hash table. */
3044 lttng_ht_node_init_ulong(&app
->notify_sock_n
, app
->notify_sock
);
3045 lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock
, &app
->notify_sock_n
);
3047 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s "
3048 "notify_sock:%d (version %d.%d)", app
->pid
, app
->ppid
, app
->uid
,
3049 app
->gid
, app
->sock
, app
->name
, app
->notify_sock
, app
->v_major
,
3056 * Set the application version into the object.
3058 * Return 0 on success else a negative value either an errno code or a
3059 * LTTng-UST error code.
3061 int ust_app_version(struct ust_app
*app
)
3067 ret
= ustctl_tracer_version(app
->sock
, &app
->version
);
3069 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3070 ERR("UST app %d version failed with ret %d", app
->sock
, ret
);
3072 DBG3("UST app %d version failed. Application is dead", app
->sock
);
3080 * Unregister app by removing it from the global traceable app list and freeing
3083 * The socket is already closed at this point so no close to sock.
3085 void ust_app_unregister(int sock
)
3087 struct ust_app
*lta
;
3088 struct lttng_ht_node_ulong
*node
;
3089 struct lttng_ht_iter ust_app_sock_iter
;
3090 struct lttng_ht_iter iter
;
3091 struct ust_app_session
*ua_sess
;
3096 /* Get the node reference for a call_rcu */
3097 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &ust_app_sock_iter
);
3098 node
= lttng_ht_iter_get_node_ulong(&ust_app_sock_iter
);
3101 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
3102 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
3105 * For per-PID buffers, perform "push metadata" and flush all
3106 * application streams before removing app from hash tables,
3107 * ensuring proper behavior of data_pending check.
3108 * Remove sessions so they are not visible during deletion.
3110 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
3112 struct ust_registry_session
*registry
;
3114 ret
= lttng_ht_del(lta
->sessions
, &iter
);
3116 /* The session was already removed so scheduled for teardown. */
3120 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
3121 (void) ust_app_flush_app_session(lta
, ua_sess
);
3125 * Add session to list for teardown. This is safe since at this point we
3126 * are the only one using this list.
3128 pthread_mutex_lock(&ua_sess
->lock
);
3131 * Normally, this is done in the delete session process which is
3132 * executed in the call rcu below. However, upon registration we can't
3133 * afford to wait for the grace period before pushing data or else the
3134 * data pending feature can race between the unregistration and stop
3135 * command where the data pending command is sent *before* the grace
3138 * The close metadata below nullifies the metadata pointer in the
3139 * session so the delete session will NOT push/close a second time.
3141 registry
= get_session_registry(ua_sess
);
3143 /* Push metadata for application before freeing the application. */
3144 (void) push_metadata(registry
, ua_sess
->consumer
);
3147 * Don't ask to close metadata for global per UID buffers. Close
3148 * metadata only on destroy trace session in this case. Also, the
3149 * previous push metadata could have flag the metadata registry to
3150 * close so don't send a close command if closed.
3152 if (ua_sess
->buffer_type
!= LTTNG_BUFFER_PER_UID
) {
3153 /* And ask to close it for this session registry. */
3154 (void) close_metadata(registry
, ua_sess
->consumer
);
3157 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
3159 pthread_mutex_unlock(&ua_sess
->lock
);
3162 /* Remove application from PID hash table */
3163 ret
= lttng_ht_del(ust_app_ht_by_sock
, &ust_app_sock_iter
);
3167 * Remove application from notify hash table. The thread handling the
3168 * notify socket could have deleted the node so ignore on error because
3169 * either way it's valid. The close of that socket is handled by the other
3172 iter
.iter
.node
= <a
->notify_sock_n
.node
;
3173 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3176 * Ignore return value since the node might have been removed before by an
3177 * add replace during app registration because the PID can be reassigned by
3180 iter
.iter
.node
= <a
->pid_n
.node
;
3181 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3183 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
3188 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
3195 * Fill events array with all events name of all registered apps.
3197 int ust_app_list_events(struct lttng_event
**events
)
3200 size_t nbmem
, count
= 0;
3201 struct lttng_ht_iter iter
;
3202 struct ust_app
*app
;
3203 struct lttng_event
*tmp_event
;
3205 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3206 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
3207 if (tmp_event
== NULL
) {
3208 PERROR("zmalloc ust app events");
3215 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3216 struct lttng_ust_tracepoint_iter uiter
;
3218 health_code_update();
3220 if (!app
->compatible
) {
3222 * TODO: In time, we should notice the caller of this error by
3223 * telling him that this is a version error.
3227 handle
= ustctl_tracepoint_list(app
->sock
);
3229 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3230 ERR("UST app list events getting handle failed for app pid %d",
3236 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
3237 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3238 /* Handle ustctl error. */
3240 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3241 ERR("UST app tp list get failed for app %d with ret %d",
3244 DBG3("UST app tp list get failed. Application is dead");
3246 * This is normal behavior, an application can die during the
3247 * creation process. Don't report an error so the execution can
3248 * continue normally. Continue normal execution.
3256 health_code_update();
3257 if (count
>= nbmem
) {
3258 /* In case the realloc fails, we free the memory */
3259 struct lttng_event
*new_tmp_event
;
3262 new_nbmem
= nbmem
<< 1;
3263 DBG2("Reallocating event list from %zu to %zu entries",
3265 new_tmp_event
= realloc(tmp_event
,
3266 new_nbmem
* sizeof(struct lttng_event
));
3267 if (new_tmp_event
== NULL
) {
3268 PERROR("realloc ust app events");
3273 /* Zero the new memory */
3274 memset(new_tmp_event
+ nbmem
, 0,
3275 (new_nbmem
- nbmem
) * sizeof(struct lttng_event
));
3277 tmp_event
= new_tmp_event
;
3279 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
3280 tmp_event
[count
].loglevel
= uiter
.loglevel
;
3281 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
3282 tmp_event
[count
].pid
= app
->pid
;
3283 tmp_event
[count
].enabled
= -1;
3289 *events
= tmp_event
;
3291 DBG2("UST app list events done (%zu events)", count
);
3296 health_code_update();
3301 * Fill events array with all events name of all registered apps.
3303 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
3306 size_t nbmem
, count
= 0;
3307 struct lttng_ht_iter iter
;
3308 struct ust_app
*app
;
3309 struct lttng_event_field
*tmp_event
;
3311 nbmem
= UST_APP_EVENT_LIST_SIZE
;
3312 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
3313 if (tmp_event
== NULL
) {
3314 PERROR("zmalloc ust app event fields");
3321 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3322 struct lttng_ust_field_iter uiter
;
3324 health_code_update();
3326 if (!app
->compatible
) {
3328 * TODO: In time, we should notice the caller of this error by
3329 * telling him that this is a version error.
3333 handle
= ustctl_tracepoint_field_list(app
->sock
);
3335 if (handle
!= -EPIPE
&& handle
!= -LTTNG_UST_ERR_EXITING
) {
3336 ERR("UST app list field getting handle failed for app pid %d",
3342 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
3343 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
3344 /* Handle ustctl error. */
3346 if (ret
!= -LTTNG_UST_ERR_EXITING
&& ret
!= -EPIPE
) {
3347 ERR("UST app tp list field failed for app %d with ret %d",
3350 DBG3("UST app tp list field failed. Application is dead");
3352 * This is normal behavior, an application can die during the
3353 * creation process. Don't report an error so the execution can
3354 * continue normally. Reset list and count for next app.
3362 health_code_update();
3363 if (count
>= nbmem
) {
3364 /* In case the realloc fails, we free the memory */
3365 struct lttng_event_field
*new_tmp_event
;
3368 new_nbmem
= nbmem
<< 1;
3369 DBG2("Reallocating event field list from %zu to %zu entries",
3371 new_tmp_event
= realloc(tmp_event
,
3372 new_nbmem
* sizeof(struct lttng_event_field
));
3373 if (new_tmp_event
== NULL
) {
3374 PERROR("realloc ust app event fields");
3379 /* Zero the new memory */
3380 memset(new_tmp_event
+ nbmem
, 0,
3381 (new_nbmem
- nbmem
) * sizeof(struct lttng_event_field
));
3383 tmp_event
= new_tmp_event
;
3386 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
3387 /* Mapping between these enums matches 1 to 1. */
3388 tmp_event
[count
].type
= (enum lttng_event_field_type
) uiter
.type
;
3389 tmp_event
[count
].nowrite
= uiter
.nowrite
;
3391 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
3392 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
3393 tmp_event
[count
].event
.type
= LTTNG_EVENT_TRACEPOINT
;
3394 tmp_event
[count
].event
.pid
= app
->pid
;
3395 tmp_event
[count
].event
.enabled
= -1;
3401 *fields
= tmp_event
;
3403 DBG2("UST app list event fields done (%zu events)", count
);
3408 health_code_update();
3413 * Free and clean all traceable apps of the global list.
3415 * Should _NOT_ be called with RCU read-side lock held.
3417 void ust_app_clean_list(void)
3420 struct ust_app
*app
;
3421 struct lttng_ht_iter iter
;
3423 DBG2("UST app cleaning registered apps hash table");
3427 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3428 ret
= lttng_ht_del(ust_app_ht
, &iter
);
3430 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
3433 /* Cleanup socket hash table */
3434 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
3436 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
3440 /* Cleanup notify socket hash table */
3441 cds_lfht_for_each_entry(ust_app_ht_by_notify_sock
->ht
, &iter
.iter
, app
,
3442 notify_sock_n
.node
) {
3443 ret
= lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
3448 /* Destroy is done only when the ht is empty */
3449 ht_cleanup_push(ust_app_ht
);
3450 ht_cleanup_push(ust_app_ht_by_sock
);
3451 ht_cleanup_push(ust_app_ht_by_notify_sock
);
3455 * Init UST app hash table.
3457 void ust_app_ht_alloc(void)
3459 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3460 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3461 ust_app_ht_by_notify_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3465 * For a specific UST session, disable the channel for all registered apps.
3467 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
3468 struct ltt_ust_channel
*uchan
)
3471 struct lttng_ht_iter iter
;
3472 struct lttng_ht_node_str
*ua_chan_node
;
3473 struct ust_app
*app
;
3474 struct ust_app_session
*ua_sess
;
3475 struct ust_app_channel
*ua_chan
;
3477 if (usess
== NULL
|| uchan
== NULL
) {
3478 ERR("Disabling UST global channel with NULL values");
3483 DBG2("UST app disabling channel %s from global domain for session id %" PRIu64
,
3484 uchan
->name
, usess
->id
);
3488 /* For every registered applications */
3489 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3490 struct lttng_ht_iter uiter
;
3491 if (!app
->compatible
) {
3493 * TODO: In time, we should notice the caller of this error by
3494 * telling him that this is a version error.
3498 ua_sess
= lookup_session_by_app(usess
, app
);
3499 if (ua_sess
== NULL
) {
3504 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3505 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3506 /* If the session if found for the app, the channel must be there */
3507 assert(ua_chan_node
);
3509 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3510 /* The channel must not be already disabled */
3511 assert(ua_chan
->enabled
== 1);
3513 /* Disable channel onto application */
3514 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
3516 /* XXX: We might want to report this error at some point... */
3528 * For a specific UST session, enable the channel for all registered apps.
3530 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
3531 struct ltt_ust_channel
*uchan
)
3534 struct lttng_ht_iter iter
;
3535 struct ust_app
*app
;
3536 struct ust_app_session
*ua_sess
;
3538 if (usess
== NULL
|| uchan
== NULL
) {
3539 ERR("Adding UST global channel to NULL values");
3544 DBG2("UST app enabling channel %s to global domain for session id %" PRIu64
,
3545 uchan
->name
, usess
->id
);
3549 /* For every registered applications */
3550 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3551 if (!app
->compatible
) {
3553 * TODO: In time, we should notice the caller of this error by
3554 * telling him that this is a version error.
3558 ua_sess
= lookup_session_by_app(usess
, app
);
3559 if (ua_sess
== NULL
) {
3563 /* Enable channel onto application */
3564 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
3566 /* XXX: We might want to report this error at some point... */
3578 * Disable an event in a channel and for a specific session.
3580 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
3581 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3584 struct lttng_ht_iter iter
, uiter
;
3585 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
3586 struct ust_app
*app
;
3587 struct ust_app_session
*ua_sess
;
3588 struct ust_app_channel
*ua_chan
;
3589 struct ust_app_event
*ua_event
;
3591 DBG("UST app disabling event %s for all apps in channel "
3592 "%s for session id %" PRIu64
,
3593 uevent
->attr
.name
, uchan
->name
, usess
->id
);
3597 /* For all registered applications */
3598 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3599 if (!app
->compatible
) {
3601 * TODO: In time, we should notice the caller of this error by
3602 * telling him that this is a version error.
3606 ua_sess
= lookup_session_by_app(usess
, app
);
3607 if (ua_sess
== NULL
) {
3612 /* Lookup channel in the ust app session */
3613 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3614 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3615 if (ua_chan_node
== NULL
) {
3616 DBG2("Channel %s not found in session id %" PRIu64
" for app pid %d."
3617 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
3620 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3622 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
3623 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
3624 if (ua_event_node
== NULL
) {
3625 DBG2("Event %s not found in channel %s for app pid %d."
3626 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
3629 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
3631 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
3633 /* XXX: Report error someday... */
3644 * For a specific UST session, create the channel for all registered apps.
3646 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
3647 struct ltt_ust_channel
*uchan
)
3649 int ret
= 0, created
;
3650 struct lttng_ht_iter iter
;
3651 struct ust_app
*app
;
3652 struct ust_app_session
*ua_sess
= NULL
;
3654 /* Very wrong code flow */
3658 DBG2("UST app adding channel %s to UST domain for session id %" PRIu64
,
3659 uchan
->name
, usess
->id
);
3663 /* For every registered applications */
3664 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3665 if (!app
->compatible
) {
3667 * TODO: In time, we should notice the caller of this error by
3668 * telling him that this is a version error.
3673 * Create session on the tracer side and add it to app session HT. Note
3674 * that if session exist, it will simply return a pointer to the ust
3677 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
3682 * The application's socket is not valid. Either a bad socket
3683 * or a timeout on it. We can't inform the caller that for a
3684 * specific app, the session failed so lets continue here.
3689 goto error_rcu_unlock
;
3694 pthread_mutex_lock(&ua_sess
->lock
);
3695 if (!strncmp(uchan
->name
, DEFAULT_METADATA_NAME
,
3696 sizeof(uchan
->name
))) {
3697 copy_channel_attr_to_ustctl(&ua_sess
->metadata_attr
, &uchan
->attr
);
3700 /* Create channel onto application. We don't need the chan ref. */
3701 ret
= create_ust_app_channel(ua_sess
, uchan
, app
,
3702 LTTNG_UST_CHAN_PER_CPU
, usess
, NULL
);
3704 pthread_mutex_unlock(&ua_sess
->lock
);
3706 if (ret
== -ENOMEM
) {
3707 /* No more memory is a fatal error. Stop right now. */
3708 goto error_rcu_unlock
;
3710 /* Cleanup the created session if it's the case. */
3712 destroy_app_session(app
, ua_sess
);
3723 * Enable event for a specific session and channel on the tracer.
3725 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
3726 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3729 struct lttng_ht_iter iter
, uiter
;
3730 struct lttng_ht_node_str
*ua_chan_node
;
3731 struct ust_app
*app
;
3732 struct ust_app_session
*ua_sess
;
3733 struct ust_app_channel
*ua_chan
;
3734 struct ust_app_event
*ua_event
;
3736 DBG("UST app enabling event %s for all apps for session id %" PRIu64
,
3737 uevent
->attr
.name
, usess
->id
);
3740 * NOTE: At this point, this function is called only if the session and
3741 * channel passed are already created for all apps. and enabled on the
3747 /* For all registered applications */
3748 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3749 if (!app
->compatible
) {
3751 * TODO: In time, we should notice the caller of this error by
3752 * telling him that this is a version error.
3756 ua_sess
= lookup_session_by_app(usess
, app
);
3758 /* The application has problem or is probably dead. */
3762 pthread_mutex_lock(&ua_sess
->lock
);
3764 /* Lookup channel in the ust app session */
3765 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3766 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3767 /* If the channel is not found, there is a code flow error */
3768 assert(ua_chan_node
);
3770 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3772 /* Get event node */
3773 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
3774 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
3775 if (ua_event
== NULL
) {
3776 DBG3("UST app enable event %s not found for app PID %d."
3777 "Skipping app", uevent
->attr
.name
, app
->pid
);
3781 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
3783 pthread_mutex_unlock(&ua_sess
->lock
);
3787 pthread_mutex_unlock(&ua_sess
->lock
);
3796 * For a specific existing UST session and UST channel, creates the event for
3797 * all registered apps.
3799 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
3800 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
3803 struct lttng_ht_iter iter
, uiter
;
3804 struct lttng_ht_node_str
*ua_chan_node
;
3805 struct ust_app
*app
;
3806 struct ust_app_session
*ua_sess
;
3807 struct ust_app_channel
*ua_chan
;
3809 DBG("UST app creating event %s for all apps for session id %" PRIu64
,
3810 uevent
->attr
.name
, usess
->id
);
3814 /* For all registered applications */
3815 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
3816 if (!app
->compatible
) {
3818 * TODO: In time, we should notice the caller of this error by
3819 * telling him that this is a version error.
3823 ua_sess
= lookup_session_by_app(usess
, app
);
3825 /* The application has problem or is probably dead. */
3829 pthread_mutex_lock(&ua_sess
->lock
);
3830 /* Lookup channel in the ust app session */
3831 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
3832 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
3833 /* If the channel is not found, there is a code flow error */
3834 assert(ua_chan_node
);
3836 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
3838 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
3839 pthread_mutex_unlock(&ua_sess
->lock
);
3841 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
3842 /* Possible value at this point: -ENOMEM. If so, we stop! */
3845 DBG2("UST app event %s already exist on app PID %d",
3846 uevent
->attr
.name
, app
->pid
);
3857 * Start tracing for a specific UST session and app.
3860 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3863 struct ust_app_session
*ua_sess
;
3865 DBG("Starting tracing for ust app pid %d", app
->pid
);
3869 if (!app
->compatible
) {
3873 ua_sess
= lookup_session_by_app(usess
, app
);
3874 if (ua_sess
== NULL
) {
3875 /* The session is in teardown process. Ignore and continue. */
3879 pthread_mutex_lock(&ua_sess
->lock
);
3881 /* Upon restart, we skip the setup, already done */
3882 if (ua_sess
->started
) {
3886 /* Create directories if consumer is LOCAL and has a path defined. */
3887 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
3888 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
3889 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
3890 S_IRWXU
| S_IRWXG
, ua_sess
->euid
, ua_sess
->egid
);
3892 if (ret
!= -EEXIST
) {
3893 ERR("Trace directory creation error");
3900 * Create the metadata for the application. This returns gracefully if a
3901 * metadata was already set for the session.
3903 ret
= create_ust_app_metadata(ua_sess
, app
, usess
->consumer
);
3908 health_code_update();
3911 /* This start the UST tracing */
3912 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
3914 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3915 ERR("Error starting tracing for app pid: %d (ret: %d)",
3918 DBG("UST app start session failed. Application is dead.");
3920 * This is normal behavior, an application can die during the
3921 * creation process. Don't report an error so the execution can
3922 * continue normally.
3924 pthread_mutex_unlock(&ua_sess
->lock
);
3930 /* Indicate that the session has been started once */
3931 ua_sess
->started
= 1;
3933 pthread_mutex_unlock(&ua_sess
->lock
);
3935 health_code_update();
3937 /* Quiescent wait after starting trace */
3938 ret
= ustctl_wait_quiescent(app
->sock
);
3939 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3940 ERR("UST app wait quiescent failed for app pid %d ret %d",
3946 health_code_update();
3950 pthread_mutex_unlock(&ua_sess
->lock
);
3952 health_code_update();
3957 * Stop tracing for a specific UST session and app.
3960 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
3963 struct ust_app_session
*ua_sess
;
3964 struct ust_registry_session
*registry
;
3966 DBG("Stopping tracing for ust app pid %d", app
->pid
);
3970 if (!app
->compatible
) {
3971 goto end_no_session
;
3974 ua_sess
= lookup_session_by_app(usess
, app
);
3975 if (ua_sess
== NULL
) {
3976 goto end_no_session
;
3979 pthread_mutex_lock(&ua_sess
->lock
);
3982 * If started = 0, it means that stop trace has been called for a session
3983 * that was never started. It's possible since we can have a fail start
3984 * from either the application manager thread or the command thread. Simply
3985 * indicate that this is a stop error.
3987 if (!ua_sess
->started
) {
3988 goto error_rcu_unlock
;
3991 health_code_update();
3993 /* This inhibits UST tracing */
3994 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
3996 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
3997 ERR("Error stopping tracing for app pid: %d (ret: %d)",
4000 DBG("UST app stop session failed. Application is dead.");
4002 * This is normal behavior, an application can die during the
4003 * creation process. Don't report an error so the execution can
4004 * continue normally.
4008 goto error_rcu_unlock
;
4011 health_code_update();
4013 /* Quiescent wait after stopping trace */
4014 ret
= ustctl_wait_quiescent(app
->sock
);
4015 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4016 ERR("UST app wait quiescent failed for app pid %d ret %d",
4020 health_code_update();
4022 registry
= get_session_registry(ua_sess
);
4025 /* Push metadata for application before freeing the application. */
4026 (void) push_metadata(registry
, ua_sess
->consumer
);
4029 pthread_mutex_unlock(&ua_sess
->lock
);
4032 health_code_update();
4036 pthread_mutex_unlock(&ua_sess
->lock
);
4038 health_code_update();
4043 int ust_app_flush_app_session(struct ust_app
*app
,
4044 struct ust_app_session
*ua_sess
)
4046 int ret
, retval
= 0;
4047 struct lttng_ht_iter iter
;
4048 struct ust_app_channel
*ua_chan
;
4049 struct consumer_socket
*socket
;
4051 DBG("Flushing app session buffers for ust app pid %d", app
->pid
);
4055 if (!app
->compatible
) {
4056 goto end_not_compatible
;
4059 pthread_mutex_lock(&ua_sess
->lock
);
4061 health_code_update();
4063 /* Flushing buffers */
4064 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
4067 /* Flush buffers and push metadata. */
4068 switch (ua_sess
->buffer_type
) {
4069 case LTTNG_BUFFER_PER_PID
:
4070 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4072 health_code_update();
4073 assert(ua_chan
->is_sent
);
4074 ret
= consumer_flush_channel(socket
, ua_chan
->key
);
4076 ERR("Error flushing consumer channel");
4082 case LTTNG_BUFFER_PER_UID
:
4088 health_code_update();
4090 pthread_mutex_unlock(&ua_sess
->lock
);
4094 health_code_update();
4099 * Flush buffers for all applications for a specific UST session.
4100 * Called with UST session lock held.
4103 int ust_app_flush_session(struct ltt_ust_session
*usess
)
4108 DBG("Flushing session buffers for all ust apps");
4112 /* Flush buffers and push metadata. */
4113 switch (usess
->buffer_type
) {
4114 case LTTNG_BUFFER_PER_UID
:
4116 struct buffer_reg_uid
*reg
;
4117 struct lttng_ht_iter iter
;
4119 /* Flush all per UID buffers associated to that session. */
4120 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4121 struct ust_registry_session
*ust_session_reg
;
4122 struct buffer_reg_channel
*reg_chan
;
4123 struct consumer_socket
*socket
;
4125 /* Get consumer socket to use to push the metadata.*/
4126 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
4129 /* Ignore request if no consumer is found for the session. */
4133 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
4134 reg_chan
, node
.node
) {
4136 * The following call will print error values so the return
4137 * code is of little importance because whatever happens, we
4138 * have to try them all.
4140 (void) consumer_flush_channel(socket
, reg_chan
->consumer_key
);
4143 ust_session_reg
= reg
->registry
->reg
.ust
;
4144 /* Push metadata. */
4145 (void) push_metadata(ust_session_reg
, usess
->consumer
);
4149 case LTTNG_BUFFER_PER_PID
:
4151 struct ust_app_session
*ua_sess
;
4152 struct lttng_ht_iter iter
;
4153 struct ust_app
*app
;
4155 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4156 ua_sess
= lookup_session_by_app(usess
, app
);
4157 if (ua_sess
== NULL
) {
4160 (void) ust_app_flush_app_session(app
, ua_sess
);
4172 health_code_update();
4177 * Destroy a specific UST session in apps.
4179 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
4182 struct ust_app_session
*ua_sess
;
4183 struct lttng_ht_iter iter
;
4184 struct lttng_ht_node_u64
*node
;
4186 DBG("Destroy tracing for ust app pid %d", app
->pid
);
4190 if (!app
->compatible
) {
4194 __lookup_session_by_app(usess
, app
, &iter
);
4195 node
= lttng_ht_iter_get_node_u64(&iter
);
4197 /* Session is being or is deleted. */
4200 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
4202 health_code_update();
4203 destroy_app_session(app
, ua_sess
);
4205 health_code_update();
4207 /* Quiescent wait after stopping trace */
4208 ret
= ustctl_wait_quiescent(app
->sock
);
4209 if (ret
< 0 && ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4210 ERR("UST app wait quiescent failed for app pid %d ret %d",
4215 health_code_update();
4220 * Start tracing for the UST session.
4222 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
4225 struct lttng_ht_iter iter
;
4226 struct ust_app
*app
;
4228 DBG("Starting all UST traces");
4232 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4233 ret
= ust_app_start_trace(usess
, app
);
4235 /* Continue to next apps even on error */
4246 * Start tracing for the UST session.
4247 * Called with UST session lock held.
4249 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
4252 struct lttng_ht_iter iter
;
4253 struct ust_app
*app
;
4255 DBG("Stopping all UST traces");
4259 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4260 ret
= ust_app_stop_trace(usess
, app
);
4262 /* Continue to next apps even on error */
4267 (void) ust_app_flush_session(usess
);
4275 * Destroy app UST session.
4277 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
4280 struct lttng_ht_iter iter
;
4281 struct ust_app
*app
;
4283 DBG("Destroy all UST traces");
4287 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4288 ret
= destroy_trace(usess
, app
);
4290 /* Continue to next apps even on error */
4301 * Add channels/events from UST global domain to registered apps at sock.
4303 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
4306 struct lttng_ht_iter iter
, uiter
;
4307 struct ust_app
*app
;
4308 struct ust_app_session
*ua_sess
= NULL
;
4309 struct ust_app_channel
*ua_chan
;
4310 struct ust_app_event
*ua_event
;
4311 struct ust_app_ctx
*ua_ctx
;
4316 DBG2("UST app global update for app sock %d for session id %" PRIu64
, sock
,
4321 app
= ust_app_find_by_sock(sock
);
4324 * Application can be unregistered before so this is possible hence
4325 * simply stopping the update.
4327 DBG3("UST app update failed to find app sock %d", sock
);
4331 if (!app
->compatible
) {
4335 ret
= create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
4337 /* Tracer is probably gone or ENOMEM. */
4342 pthread_mutex_lock(&ua_sess
->lock
);
4345 * We can iterate safely here over all UST app session since the create ust
4346 * app session above made a shadow copy of the UST global domain from the
4349 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
4351 ret
= do_create_channel(app
, usess
, ua_sess
, ua_chan
);
4354 * Stop everything. On error, the application failed, no more
4355 * file descriptor are available or ENOMEM so stopping here is
4356 * the only thing we can do for now.
4362 * Add context using the list so they are enabled in the same order the
4365 cds_list_for_each_entry(ua_ctx
, &ua_chan
->ctx_list
, list
) {
4366 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
4373 /* For each events */
4374 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
4376 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
4383 pthread_mutex_unlock(&ua_sess
->lock
);
4385 if (usess
->active
) {
4386 ret
= ust_app_start_trace(usess
, app
);
4391 DBG2("UST trace started for app pid %d", app
->pid
);
4394 /* Everything went well at this point. */
4399 pthread_mutex_unlock(&ua_sess
->lock
);
4402 destroy_app_session(app
, ua_sess
);
4409 * Add context to a specific channel for global UST domain.
4411 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
4412 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
4415 struct lttng_ht_node_str
*ua_chan_node
;
4416 struct lttng_ht_iter iter
, uiter
;
4417 struct ust_app_channel
*ua_chan
= NULL
;
4418 struct ust_app_session
*ua_sess
;
4419 struct ust_app
*app
;
4423 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4424 if (!app
->compatible
) {
4426 * TODO: In time, we should notice the caller of this error by
4427 * telling him that this is a version error.
4431 ua_sess
= lookup_session_by_app(usess
, app
);
4432 if (ua_sess
== NULL
) {
4436 pthread_mutex_lock(&ua_sess
->lock
);
4437 /* Lookup channel in the ust app session */
4438 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
4439 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
4440 if (ua_chan_node
== NULL
) {
4443 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
4445 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
4450 pthread_mutex_unlock(&ua_sess
->lock
);
4458 * Enable event for a channel from a UST session for a specific PID.
4460 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
4461 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
4464 struct lttng_ht_iter iter
;
4465 struct lttng_ht_node_str
*ua_chan_node
;
4466 struct ust_app
*app
;
4467 struct ust_app_session
*ua_sess
;
4468 struct ust_app_channel
*ua_chan
;
4469 struct ust_app_event
*ua_event
;
4471 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
4475 app
= ust_app_find_by_pid(pid
);
4477 ERR("UST app enable event per PID %d not found", pid
);
4482 if (!app
->compatible
) {
4487 ua_sess
= lookup_session_by_app(usess
, app
);
4489 /* The application has problem or is probably dead. */
4494 pthread_mutex_lock(&ua_sess
->lock
);
4495 /* Lookup channel in the ust app session */
4496 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
4497 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
4498 /* If the channel is not found, there is a code flow error */
4499 assert(ua_chan_node
);
4501 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
4503 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
4504 uevent
->filter
, uevent
->attr
.loglevel
, uevent
->exclusion
);
4505 if (ua_event
== NULL
) {
4506 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
4511 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
4518 pthread_mutex_unlock(&ua_sess
->lock
);
4525 * Calibrate registered applications.
4527 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
4530 struct lttng_ht_iter iter
;
4531 struct ust_app
*app
;
4535 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
4536 if (!app
->compatible
) {
4538 * TODO: In time, we should notice the caller of this error by
4539 * telling him that this is a version error.
4544 health_code_update();
4546 ret
= ustctl_calibrate(app
->sock
, calibrate
);
4550 /* Means that it's not implemented on the tracer side. */
4554 DBG2("Calibrate app PID %d returned with error %d",
4561 DBG("UST app global domain calibration finished");
4565 health_code_update();
4571 * Receive registration and populate the given msg structure.
4573 * On success return 0 else a negative value returned by the ustctl call.
4575 int ust_app_recv_registration(int sock
, struct ust_register_msg
*msg
)
4578 uint32_t pid
, ppid
, uid
, gid
;
4582 ret
= ustctl_recv_reg_msg(sock
, &msg
->type
, &msg
->major
, &msg
->minor
,
4583 &pid
, &ppid
, &uid
, &gid
,
4584 &msg
->bits_per_long
,
4585 &msg
->uint8_t_alignment
,
4586 &msg
->uint16_t_alignment
,
4587 &msg
->uint32_t_alignment
,
4588 &msg
->uint64_t_alignment
,
4589 &msg
->long_alignment
,
4596 case LTTNG_UST_ERR_EXITING
:
4597 DBG3("UST app recv reg message failed. Application died");
4599 case LTTNG_UST_ERR_UNSUP_MAJOR
:
4600 ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d",
4601 msg
->major
, msg
->minor
, LTTNG_UST_ABI_MAJOR_VERSION
,
4602 LTTNG_UST_ABI_MINOR_VERSION
);
4605 ERR("UST app recv reg message failed with ret %d", ret
);
4610 msg
->pid
= (pid_t
) pid
;
4611 msg
->ppid
= (pid_t
) ppid
;
4612 msg
->uid
= (uid_t
) uid
;
4613 msg
->gid
= (gid_t
) gid
;
4620 * Return a ust app channel object using the application object and the channel
4621 * object descriptor has a key. If not found, NULL is returned. A RCU read side
4622 * lock MUST be acquired before calling this function.
4624 static struct ust_app_channel
*find_channel_by_objd(struct ust_app
*app
,
4627 struct lttng_ht_node_ulong
*node
;
4628 struct lttng_ht_iter iter
;
4629 struct ust_app_channel
*ua_chan
= NULL
;
4633 lttng_ht_lookup(app
->ust_objd
, (void *)((unsigned long) objd
), &iter
);
4634 node
= lttng_ht_iter_get_node_ulong(&iter
);
4636 DBG2("UST app channel find by objd %d not found", objd
);
4640 ua_chan
= caa_container_of(node
, struct ust_app_channel
, ust_objd_node
);
4647 * Reply to a register channel notification from an application on the notify
4648 * socket. The channel metadata is also created.
4650 * The session UST registry lock is acquired in this function.
4652 * On success 0 is returned else a negative value.
4654 static int reply_ust_register_channel(int sock
, int sobjd
, int cobjd
,
4655 size_t nr_fields
, struct ustctl_field
*fields
)
4657 int ret
, ret_code
= 0;
4658 uint32_t chan_id
, reg_count
;
4659 uint64_t chan_reg_key
;
4660 enum ustctl_channel_header type
;
4661 struct ust_app
*app
;
4662 struct ust_app_channel
*ua_chan
;
4663 struct ust_app_session
*ua_sess
;
4664 struct ust_registry_session
*registry
;
4665 struct ust_registry_channel
*chan_reg
;
4669 /* Lookup application. If not found, there is a code flow error. */
4670 app
= find_app_by_notify_sock(sock
);
4672 DBG("Application socket %d is being teardown. Abort event notify",
4676 goto error_rcu_unlock
;
4679 /* Lookup channel by UST object descriptor. */
4680 ua_chan
= find_channel_by_objd(app
, cobjd
);
4682 DBG("Application channel is being teardown. Abort event notify");
4685 goto error_rcu_unlock
;
4688 assert(ua_chan
->session
);
4689 ua_sess
= ua_chan
->session
;
4691 /* Get right session registry depending on the session buffer type. */
4692 registry
= get_session_registry(ua_sess
);
4695 /* Depending on the buffer type, a different channel key is used. */
4696 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4697 chan_reg_key
= ua_chan
->tracing_channel_id
;
4699 chan_reg_key
= ua_chan
->key
;
4702 pthread_mutex_lock(®istry
->lock
);
4704 chan_reg
= ust_registry_channel_find(registry
, chan_reg_key
);
4707 if (!chan_reg
->register_done
) {
4708 reg_count
= ust_registry_get_event_count(chan_reg
);
4709 if (reg_count
< 31) {
4710 type
= USTCTL_CHANNEL_HEADER_COMPACT
;
4712 type
= USTCTL_CHANNEL_HEADER_LARGE
;
4715 chan_reg
->nr_ctx_fields
= nr_fields
;
4716 chan_reg
->ctx_fields
= fields
;
4717 chan_reg
->header_type
= type
;
4719 /* Get current already assigned values. */
4720 type
= chan_reg
->header_type
;
4722 /* Set to NULL so the error path does not do a double free. */
4725 /* Channel id is set during the object creation. */
4726 chan_id
= chan_reg
->chan_id
;
4728 /* Append to metadata */
4729 if (!chan_reg
->metadata_dumped
) {
4730 ret_code
= ust_metadata_channel_statedump(registry
, chan_reg
);
4732 ERR("Error appending channel metadata (errno = %d)", ret_code
);
4738 DBG3("UST app replying to register channel key %" PRIu64
4739 " with id %u, type: %d, ret: %d", chan_reg_key
, chan_id
, type
,
4742 ret
= ustctl_reply_register_channel(sock
, chan_id
, type
, ret_code
);
4744 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4745 ERR("UST app reply channel failed with ret %d", ret
);
4747 DBG3("UST app reply channel failed. Application died");
4752 /* This channel registry registration is completed. */
4753 chan_reg
->register_done
= 1;
4756 pthread_mutex_unlock(®istry
->lock
);
4766 * Add event to the UST channel registry. When the event is added to the
4767 * registry, the metadata is also created. Once done, this replies to the
4768 * application with the appropriate error code.
4770 * The session UST registry lock is acquired in the function.
4772 * On success 0 is returned else a negative value.
4774 static int add_event_ust_registry(int sock
, int sobjd
, int cobjd
, char *name
,
4775 char *sig
, size_t nr_fields
, struct ustctl_field
*fields
, int loglevel
,
4776 char *model_emf_uri
)
4779 uint32_t event_id
= 0;
4780 uint64_t chan_reg_key
;
4781 struct ust_app
*app
;
4782 struct ust_app_channel
*ua_chan
;
4783 struct ust_app_session
*ua_sess
;
4784 struct ust_registry_session
*registry
;
4788 /* Lookup application. If not found, there is a code flow error. */
4789 app
= find_app_by_notify_sock(sock
);
4791 DBG("Application socket %d is being teardown. Abort event notify",
4796 free(model_emf_uri
);
4797 goto error_rcu_unlock
;
4800 /* Lookup channel by UST object descriptor. */
4801 ua_chan
= find_channel_by_objd(app
, cobjd
);
4803 DBG("Application channel is being teardown. Abort event notify");
4807 free(model_emf_uri
);
4808 goto error_rcu_unlock
;
4811 assert(ua_chan
->session
);
4812 ua_sess
= ua_chan
->session
;
4814 registry
= get_session_registry(ua_sess
);
4817 if (ua_sess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
4818 chan_reg_key
= ua_chan
->tracing_channel_id
;
4820 chan_reg_key
= ua_chan
->key
;
4823 pthread_mutex_lock(®istry
->lock
);
4826 * From this point on, this call acquires the ownership of the sig, fields
4827 * and model_emf_uri meaning any free are done inside it if needed. These
4828 * three variables MUST NOT be read/write after this.
4830 ret_code
= ust_registry_create_event(registry
, chan_reg_key
,
4831 sobjd
, cobjd
, name
, sig
, nr_fields
, fields
, loglevel
,
4832 model_emf_uri
, ua_sess
->buffer_type
, &event_id
,
4836 * The return value is returned to ustctl so in case of an error, the
4837 * application can be notified. In case of an error, it's important not to
4838 * return a negative error or else the application will get closed.
4840 ret
= ustctl_reply_register_event(sock
, event_id
, ret_code
);
4842 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4843 ERR("UST app reply event failed with ret %d", ret
);
4845 DBG3("UST app reply event failed. Application died");
4848 * No need to wipe the create event since the application socket will
4849 * get close on error hence cleaning up everything by itself.
4854 DBG3("UST registry event %s with id %" PRId32
" added successfully",
4858 pthread_mutex_unlock(®istry
->lock
);
4865 * Handle application notification through the given notify socket.
4867 * Return 0 on success or else a negative value.
4869 int ust_app_recv_notify(int sock
)
4872 enum ustctl_notify_cmd cmd
;
4874 DBG3("UST app receiving notify from sock %d", sock
);
4876 ret
= ustctl_recv_notify(sock
, &cmd
);
4878 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4879 ERR("UST app recv notify failed with ret %d", ret
);
4881 DBG3("UST app recv notify failed. Application died");
4887 case USTCTL_NOTIFY_CMD_EVENT
:
4889 int sobjd
, cobjd
, loglevel
;
4890 char name
[LTTNG_UST_SYM_NAME_LEN
], *sig
, *model_emf_uri
;
4892 struct ustctl_field
*fields
;
4894 DBG2("UST app ustctl register event received");
4896 ret
= ustctl_recv_register_event(sock
, &sobjd
, &cobjd
, name
, &loglevel
,
4897 &sig
, &nr_fields
, &fields
, &model_emf_uri
);
4899 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4900 ERR("UST app recv event failed with ret %d", ret
);
4902 DBG3("UST app recv event failed. Application died");
4908 * Add event to the UST registry coming from the notify socket. This
4909 * call will free if needed the sig, fields and model_emf_uri. This
4910 * code path loses the ownsership of these variables and transfer them
4911 * to the this function.
4913 ret
= add_event_ust_registry(sock
, sobjd
, cobjd
, name
, sig
, nr_fields
,
4914 fields
, loglevel
, model_emf_uri
);
4921 case USTCTL_NOTIFY_CMD_CHANNEL
:
4925 struct ustctl_field
*fields
;
4927 DBG2("UST app ustctl register channel received");
4929 ret
= ustctl_recv_register_channel(sock
, &sobjd
, &cobjd
, &nr_fields
,
4932 if (ret
!= -EPIPE
&& ret
!= -LTTNG_UST_ERR_EXITING
) {
4933 ERR("UST app recv channel failed with ret %d", ret
);
4935 DBG3("UST app recv channel failed. Application died");
4941 * The fields ownership are transfered to this function call meaning
4942 * that if needed it will be freed. After this, it's invalid to access
4943 * fields or clean it up.
4945 ret
= reply_ust_register_channel(sock
, sobjd
, cobjd
, nr_fields
,
4954 /* Should NEVER happen. */
4963 * Once the notify socket hangs up, this is called. First, it tries to find the
4964 * corresponding application. On failure, the call_rcu to close the socket is
4965 * executed. If an application is found, it tries to delete it from the notify
4966 * socket hash table. Whathever the result, it proceeds to the call_rcu.
4968 * Note that an object needs to be allocated here so on ENOMEM failure, the
4969 * call RCU is not done but the rest of the cleanup is.
4971 void ust_app_notify_sock_unregister(int sock
)
4974 struct lttng_ht_iter iter
;
4975 struct ust_app
*app
;
4976 struct ust_app_notify_sock_obj
*obj
;
4982 obj
= zmalloc(sizeof(*obj
));
4985 * An ENOMEM is kind of uncool. If this strikes we continue the
4986 * procedure but the call_rcu will not be called. In this case, we
4987 * accept the fd leak rather than possibly creating an unsynchronized
4988 * state between threads.
4990 * TODO: The notify object should be created once the notify socket is
4991 * registered and stored independantely from the ust app object. The
4992 * tricky part is to synchronize the teardown of the application and
4993 * this notify object. Let's keep that in mind so we can avoid this
4994 * kind of shenanigans with ENOMEM in the teardown path.
5001 DBG("UST app notify socket unregister %d", sock
);
5004 * Lookup application by notify socket. If this fails, this means that the
5005 * hash table delete has already been done by the application
5006 * unregistration process so we can safely close the notify socket in a
5009 app
= find_app_by_notify_sock(sock
);
5014 iter
.iter
.node
= &app
->notify_sock_n
.node
;
5017 * Whatever happens here either we fail or succeed, in both cases we have
5018 * to close the socket after a grace period to continue to the call RCU
5019 * here. If the deletion is successful, the application is not visible
5020 * anymore by other threads and is it fails it means that it was already
5021 * deleted from the hash table so either way we just have to close the
5024 (void) lttng_ht_del(ust_app_ht_by_notify_sock
, &iter
);
5030 * Close socket after a grace period to avoid for the socket to be reused
5031 * before the application object is freed creating potential race between
5032 * threads trying to add unique in the global hash table.
5035 call_rcu(&obj
->head
, close_notify_sock_rcu
);
5040 * Destroy a ust app data structure and free its memory.
5042 void ust_app_destroy(struct ust_app
*app
)
5048 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
5052 * Take a snapshot for a given UST session. The snapshot is sent to the given
5055 * Return 0 on success or else a negative value.
5057 int ust_app_snapshot_record(struct ltt_ust_session
*usess
,
5058 struct snapshot_output
*output
, int wait
,
5059 uint64_t nb_packets_per_stream
)
5062 unsigned int snapshot_done
= 0;
5063 struct lttng_ht_iter iter
;
5064 struct ust_app
*app
;
5065 char pathname
[PATH_MAX
];
5072 switch (usess
->buffer_type
) {
5073 case LTTNG_BUFFER_PER_UID
:
5075 struct buffer_reg_uid
*reg
;
5077 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5078 struct buffer_reg_channel
*reg_chan
;
5079 struct consumer_socket
*socket
;
5081 /* Get consumer socket to use to push the metadata.*/
5082 socket
= consumer_find_socket_by_bitness(reg
->bits_per_long
,
5089 memset(pathname
, 0, sizeof(pathname
));
5090 ret
= snprintf(pathname
, sizeof(pathname
),
5091 DEFAULT_UST_TRACE_DIR
"/" DEFAULT_UST_TRACE_UID_PATH
,
5092 reg
->uid
, reg
->bits_per_long
);
5094 PERROR("snprintf snapshot path");
5098 /* Add the UST default trace dir to path. */
5099 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5100 reg_chan
, node
.node
) {
5101 ret
= consumer_snapshot_channel(socket
, reg_chan
->consumer_key
,
5102 output
, 0, usess
->uid
, usess
->gid
, pathname
, wait
,
5103 nb_packets_per_stream
);
5108 ret
= consumer_snapshot_channel(socket
,
5109 reg
->registry
->reg
.ust
->metadata_key
, output
, 1,
5110 usess
->uid
, usess
->gid
, pathname
, wait
, 0);
5118 case LTTNG_BUFFER_PER_PID
:
5120 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5121 struct consumer_socket
*socket
;
5122 struct lttng_ht_iter chan_iter
;
5123 struct ust_app_channel
*ua_chan
;
5124 struct ust_app_session
*ua_sess
;
5125 struct ust_registry_session
*registry
;
5127 ua_sess
= lookup_session_by_app(usess
, app
);
5129 /* Session not associated with this app. */
5133 /* Get the right consumer socket for the application. */
5134 socket
= consumer_find_socket_by_bitness(app
->bits_per_long
,
5141 /* Add the UST default trace dir to path. */
5142 memset(pathname
, 0, sizeof(pathname
));
5143 ret
= snprintf(pathname
, sizeof(pathname
), DEFAULT_UST_TRACE_DIR
"/%s",
5146 PERROR("snprintf snapshot path");
5150 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5151 ua_chan
, node
.node
) {
5152 ret
= consumer_snapshot_channel(socket
, ua_chan
->key
, output
,
5153 0, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
,
5154 nb_packets_per_stream
);
5160 registry
= get_session_registry(ua_sess
);
5162 ret
= consumer_snapshot_channel(socket
, registry
->metadata_key
, output
,
5163 1, ua_sess
->euid
, ua_sess
->egid
, pathname
, wait
, 0);
5176 if (!snapshot_done
) {
5178 * If no snapshot was made and we are not in the error path, this means
5179 * that there are no buffers thus no (prior) application to snapshot
5180 * data from so we have simply NO data.
5191 * Return the size taken by one more packet per stream.
5193 uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session
*usess
,
5194 uint64_t cur_nr_packets
)
5196 uint64_t tot_size
= 0;
5197 struct ust_app
*app
;
5198 struct lttng_ht_iter iter
;
5202 switch (usess
->buffer_type
) {
5203 case LTTNG_BUFFER_PER_UID
:
5205 struct buffer_reg_uid
*reg
;
5207 cds_list_for_each_entry(reg
, &usess
->buffer_reg_uid_list
, lnode
) {
5208 struct buffer_reg_channel
*reg_chan
;
5211 cds_lfht_for_each_entry(reg
->registry
->channels
->ht
, &iter
.iter
,
5212 reg_chan
, node
.node
) {
5213 if (cur_nr_packets
>= reg_chan
->num_subbuf
) {
5215 * Don't take channel into account if we
5216 * already grab all its packets.
5220 tot_size
+= reg_chan
->subbuf_size
* reg_chan
->stream_count
;
5226 case LTTNG_BUFFER_PER_PID
:
5229 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
5230 struct ust_app_channel
*ua_chan
;
5231 struct ust_app_session
*ua_sess
;
5232 struct lttng_ht_iter chan_iter
;
5234 ua_sess
= lookup_session_by_app(usess
, app
);
5236 /* Session not associated with this app. */
5240 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &chan_iter
.iter
,
5241 ua_chan
, node
.node
) {
5242 if (cur_nr_packets
>= ua_chan
->attr
.num_subbuf
) {
5244 * Don't take channel into account if we
5245 * already grab all its packets.
5249 tot_size
+= ua_chan
->attr
.subbuf_size
* ua_chan
->streams
.count
;