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.
25 #include <sys/types.h>
27 #include <urcu/compiler.h>
28 #include <lttng/ust-error.h>
30 #include <common/common.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
36 #include "ust-consumer.h"
40 * Match function for the hash table lookup.
42 * It matches an ust app event based on three attributes which are the event
43 * name, the filter bytecode and the loglevel.
45 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
47 struct ust_app_event
*event
;
48 const struct ust_app_ht_key
*key
;
53 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
56 /* Match the 3 elements of the key: name, filter and loglevel. */
59 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
64 if (event
->attr
.loglevel
!= key
->loglevel
) {
65 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
66 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
68 * Match is accepted. This is because on event creation, the
69 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
70 * -1 are accepted for this loglevel type since 0 is the one set by
71 * the API when receiving an enable event.
78 /* One of the filters is NULL, fail. */
79 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
83 if (key
->filter
&& event
->filter
) {
84 /* Both filters exists, check length followed by the bytecode. */
85 if (event
->filter
->len
!= key
->filter
->len
||
86 memcmp(event
->filter
->data
, key
->filter
->data
,
87 event
->filter
->len
) != 0) {
100 * Unique add of an ust app event in the given ht. This uses the custom
101 * ht_match_ust_app_event match function and the event name as hash.
103 static void add_unique_ust_app_event(struct lttng_ht
*ht
,
104 struct ust_app_event
*event
)
106 struct cds_lfht_node
*node_ptr
;
107 struct ust_app_ht_key key
;
113 key
.name
= event
->attr
.name
;
114 key
.filter
= event
->filter
;
115 key
.loglevel
= event
->attr
.loglevel
;
117 node_ptr
= cds_lfht_add_unique(ht
->ht
,
118 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
119 ht_match_ust_app_event
, &key
, &event
->node
.node
);
120 assert(node_ptr
== &event
->node
.node
);
124 * Delete ust context safely. RCU read lock must be held before calling
128 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
131 ustctl_release_object(sock
, ua_ctx
->obj
);
138 * Delete ust app event safely. RCU read lock must be held before calling
142 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
144 free(ua_event
->filter
);
146 if (ua_event
->obj
!= NULL
) {
147 ustctl_release_object(sock
, ua_event
->obj
);
154 * Delete ust app stream safely. RCU read lock must be held before calling
158 void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
161 ustctl_release_object(sock
, stream
->obj
);
162 lttng_fd_put(LTTNG_FD_APPS
, 2);
169 * Delete ust app channel safely. RCU read lock must be held before calling
173 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
176 struct lttng_ht_iter iter
;
177 struct ust_app_event
*ua_event
;
178 struct ust_app_ctx
*ua_ctx
;
179 struct ltt_ust_stream
*stream
, *stmp
;
182 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
183 cds_list_del(&stream
->list
);
184 delete_ust_app_stream(sock
, stream
);
188 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
189 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
191 delete_ust_app_ctx(sock
, ua_ctx
);
193 lttng_ht_destroy(ua_chan
->ctx
);
196 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
198 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
200 delete_ust_app_event(sock
, ua_event
);
202 lttng_ht_destroy(ua_chan
->events
);
204 if (ua_chan
->obj
!= NULL
) {
205 ustctl_release_object(sock
, ua_chan
->obj
);
206 lttng_fd_put(LTTNG_FD_APPS
, 2);
213 * Delete ust app session safely. RCU read lock must be held before calling
217 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
)
220 struct lttng_ht_iter iter
;
221 struct ust_app_channel
*ua_chan
;
223 if (ua_sess
->metadata
) {
224 if (ua_sess
->metadata
->stream_obj
) {
225 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
226 lttng_fd_put(LTTNG_FD_APPS
, 2);
227 free(ua_sess
->metadata
->stream_obj
);
229 if (ua_sess
->metadata
->obj
) {
230 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
231 lttng_fd_put(LTTNG_FD_APPS
, 2);
232 free(ua_sess
->metadata
->obj
);
234 trace_ust_destroy_metadata(ua_sess
->metadata
);
237 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
239 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
241 delete_ust_app_channel(sock
, ua_chan
);
243 lttng_ht_destroy(ua_sess
->channels
);
245 if (ua_sess
->handle
!= -1) {
246 ustctl_release_handle(sock
, ua_sess
->handle
);
252 * Delete a traceable application structure from the global list. Never call
253 * this function outside of a call_rcu call.
256 void delete_ust_app(struct ust_app
*app
)
259 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
263 /* Delete ust app sessions info */
267 lttng_ht_destroy(app
->sessions
);
270 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
272 /* Free every object in the session and the session. */
273 delete_ust_app_session(sock
, ua_sess
);
277 * Wait until we have deleted the application from the sock hash table
278 * before closing this socket, otherwise an application could re-use the
279 * socket ID and race with the teardown, using the same hash table entry.
281 * It's OK to leave the close in call_rcu. We want it to stay unique for
282 * all RCU readers that could run concurrently with unregister app,
283 * therefore we _need_ to only close that socket after a grace period. So
284 * it should stay in this RCU callback.
286 * This close() is a very important step of the synchronization model so
287 * every modification to this function must be carefully reviewed.
293 lttng_fd_put(LTTNG_FD_APPS
, 1);
295 DBG2("UST app pid %d deleted", app
->pid
);
302 * URCU intermediate call to delete an UST app.
305 void delete_ust_app_rcu(struct rcu_head
*head
)
307 struct lttng_ht_node_ulong
*node
=
308 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
309 struct ust_app
*app
=
310 caa_container_of(node
, struct ust_app
, pid_n
);
312 DBG3("Call RCU deleting app PID %d", app
->pid
);
317 * Alloc new UST app session.
320 struct ust_app_session
*alloc_ust_app_session(void)
322 struct ust_app_session
*ua_sess
;
324 /* Init most of the default value by allocating and zeroing */
325 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
326 if (ua_sess
== NULL
) {
331 ua_sess
->handle
= -1;
332 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
341 * Alloc new UST app channel.
344 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
345 struct lttng_ust_channel
*attr
)
347 struct ust_app_channel
*ua_chan
;
349 /* Init most of the default value by allocating and zeroing */
350 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
351 if (ua_chan
== NULL
) {
356 /* Setup channel name */
357 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
358 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
360 ua_chan
->enabled
= 1;
361 ua_chan
->handle
= -1;
362 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
363 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
364 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
366 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
368 /* Copy attributes */
370 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
373 DBG3("UST app channel %s allocated", ua_chan
->name
);
382 * Alloc new UST app event.
385 struct ust_app_event
*alloc_ust_app_event(char *name
,
386 struct lttng_ust_event
*attr
)
388 struct ust_app_event
*ua_event
;
390 /* Init most of the default value by allocating and zeroing */
391 ua_event
= zmalloc(sizeof(struct ust_app_event
));
392 if (ua_event
== NULL
) {
397 ua_event
->enabled
= 1;
398 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
399 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
400 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
402 /* Copy attributes */
404 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
407 DBG3("UST app event %s allocated", ua_event
->name
);
416 * Alloc new UST app context.
419 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
421 struct ust_app_ctx
*ua_ctx
;
423 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
424 if (ua_ctx
== NULL
) {
429 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
432 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
439 * Allocate a filter and copy the given original filter.
441 * Return allocated filter or NULL on error.
443 static struct lttng_ust_filter_bytecode
*alloc_copy_ust_app_filter(
444 struct lttng_ust_filter_bytecode
*orig_f
)
446 struct lttng_ust_filter_bytecode
*filter
= NULL
;
448 /* Copy filter bytecode */
449 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
451 PERROR("zmalloc alloc ust app filter");
455 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
462 * Find an ust_app using the sock and return it. RCU read side lock must be
463 * held before calling this helper function.
466 struct ust_app
*find_app_by_sock(int sock
)
468 struct lttng_ht_node_ulong
*node
;
469 struct lttng_ht_iter iter
;
471 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
472 node
= lttng_ht_iter_get_node_ulong(&iter
);
474 DBG2("UST app find by sock %d not found", sock
);
478 return caa_container_of(node
, struct ust_app
, sock_n
);
485 * Lookup for an ust app event based on event name, filter bytecode and the
488 * Return an ust_app_event object or NULL on error.
490 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
491 char *name
, struct lttng_ust_filter_bytecode
*filter
, int loglevel
)
493 struct lttng_ht_iter iter
;
494 struct lttng_ht_node_str
*node
;
495 struct ust_app_event
*event
= NULL
;
496 struct ust_app_ht_key key
;
501 /* Setup key for event lookup. */
504 key
.loglevel
= loglevel
;
506 /* Lookup using the event name as hash and a custom match fct. */
507 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
508 ht_match_ust_app_event
, &key
, &iter
.iter
);
509 node
= lttng_ht_iter_get_node_str(&iter
);
514 event
= caa_container_of(node
, struct ust_app_event
, node
);
521 * Create the channel context on the tracer.
524 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
525 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
529 health_code_update(&health_thread_cmd
);
531 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
532 ua_chan
->obj
, &ua_ctx
->obj
);
537 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
539 DBG2("UST app context created successfully for channel %s", ua_chan
->name
);
542 health_code_update(&health_thread_cmd
);
547 * Set the filter on the tracer.
550 int set_ust_event_filter(struct ust_app_event
*ua_event
,
555 health_code_update(&health_thread_cmd
);
557 if (!ua_event
->filter
) {
562 ret
= ustctl_set_filter(app
->sock
, ua_event
->filter
,
568 DBG2("UST filter set successfully for event %s", ua_event
->name
);
571 health_code_update(&health_thread_cmd
);
576 * Disable the specified event on to UST tracer for the UST session.
578 static int disable_ust_event(struct ust_app
*app
,
579 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
583 health_code_update(&health_thread_cmd
);
585 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
587 ERR("UST app event %s disable failed for app (pid: %d) "
588 "and session handle %d with ret %d",
589 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
593 DBG2("UST app event %s disabled successfully for app (pid: %d)",
594 ua_event
->attr
.name
, app
->pid
);
597 health_code_update(&health_thread_cmd
);
602 * Disable the specified channel on to UST tracer for the UST session.
604 static int disable_ust_channel(struct ust_app
*app
,
605 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
609 health_code_update(&health_thread_cmd
);
611 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
613 ERR("UST app channel %s disable failed for app (pid: %d) "
614 "and session handle %d with ret %d",
615 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
619 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
620 ua_chan
->name
, app
->pid
);
623 health_code_update(&health_thread_cmd
);
628 * Enable the specified channel on to UST tracer for the UST session.
630 static int enable_ust_channel(struct ust_app
*app
,
631 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
635 health_code_update(&health_thread_cmd
);
637 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
639 ERR("UST app channel %s enable failed for app (pid: %d) "
640 "and session handle %d with ret %d",
641 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
645 ua_chan
->enabled
= 1;
647 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
648 ua_chan
->name
, app
->pid
);
651 health_code_update(&health_thread_cmd
);
656 * Enable the specified event on to UST tracer for the UST session.
658 static int enable_ust_event(struct ust_app
*app
,
659 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
663 health_code_update(&health_thread_cmd
);
665 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
667 ERR("UST app event %s enable failed for app (pid: %d) "
668 "and session handle %d with ret %d",
669 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
673 DBG2("UST app event %s enabled successfully for app (pid: %d)",
674 ua_event
->attr
.name
, app
->pid
);
677 health_code_update(&health_thread_cmd
);
682 * Open metadata onto the UST tracer for a UST session.
684 static int open_ust_metadata(struct ust_app
*app
,
685 struct ust_app_session
*ua_sess
)
688 struct lttng_ust_channel_attr uattr
;
690 health_code_update(&health_thread_cmd
);
692 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
693 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
694 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
695 uattr
.switch_timer_interval
=
696 ua_sess
->metadata
->attr
.switch_timer_interval
;
697 uattr
.read_timer_interval
=
698 ua_sess
->metadata
->attr
.read_timer_interval
;
699 uattr
.output
= ua_sess
->metadata
->attr
.output
;
701 /* We are going to receive 2 fds, we need to reserve them. */
702 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
704 ERR("Exhausted number of available FD upon metadata open");
707 /* UST tracer metadata creation */
708 ret
= ustctl_open_metadata(app
->sock
, ua_sess
->handle
, &uattr
,
709 &ua_sess
->metadata
->obj
);
711 ERR("UST app open metadata failed for app pid:%d with ret %d",
716 ua_sess
->metadata
->handle
= ua_sess
->metadata
->obj
->handle
;
719 health_code_update(&health_thread_cmd
);
724 * Create metadata stream onto the UST tracer for a given session.
726 static int create_ust_metadata_stream(struct ust_app
*app
,
727 struct ust_app_session
*ua_sess
)
731 health_code_update(&health_thread_cmd
);
733 /* We are going to receive 2 fds, we need to reserve them. */
734 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
736 ERR("Exhausted number of available FD upon metadata stream create");
739 ret
= ustctl_create_stream(app
->sock
, ua_sess
->metadata
->obj
,
740 &ua_sess
->metadata
->stream_obj
);
742 lttng_fd_put(LTTNG_FD_APPS
, 2);
743 ERR("UST create metadata stream failed");
748 health_code_update(&health_thread_cmd
);
753 * Create stream onto the UST tracer for a given channel.
755 * Return -ENOENT if no more stream is available for this channel.
756 * On success, return 0.
757 * On error, return a negative value.
759 static int create_ust_stream(struct ust_app
*app
,
760 struct ust_app_channel
*ua_chan
, struct ltt_ust_stream
*stream
)
766 assert(ua_chan
->obj
);
769 health_code_update(&health_thread_cmd
);
771 /* We are going to receive 2 fds, we need to reserve them. */
772 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
774 ERR("Exhausted number of available FD on stream creation");
775 /* Just to make sure we never return -ENOENT. */
780 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
, &stream
->obj
);
782 lttng_fd_put(LTTNG_FD_APPS
, 2);
783 /* Indicates that there is no more stream for that channel. */
784 if (ret
!= -LTTNG_UST_ERR_NOENT
) {
785 ERR("UST create metadata stream failed (ret: %d)", ret
);
790 /* Set stream handle with the returned value. */
791 stream
->handle
= stream
->obj
->handle
;
794 health_code_update(&health_thread_cmd
);
799 * Create the specified channel onto the UST tracer for a UST session.
801 static int create_ust_channel(struct ust_app
*app
,
802 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
806 health_code_update(&health_thread_cmd
);
808 /* TODO: remove cast and use lttng-ust-abi.h */
810 /* We are going to receive 2 fds, we need to reserve them. */
811 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
813 ERR("Exhausted number of available FD upon create channel");
817 health_code_update(&health_thread_cmd
);
819 ret
= ustctl_create_channel(app
->sock
, ua_sess
->handle
,
820 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
822 ERR("Creating channel %s for app (pid: %d, sock: %d) "
823 "and session handle %d with ret %d",
824 ua_chan
->name
, app
->pid
, app
->sock
,
825 ua_sess
->handle
, ret
);
826 lttng_fd_put(LTTNG_FD_APPS
, 2);
830 ua_chan
->handle
= ua_chan
->obj
->handle
;
832 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
833 ua_chan
->name
, app
->pid
, app
->sock
);
835 health_code_update(&health_thread_cmd
);
837 /* If channel is not enabled, disable it on the tracer */
838 if (!ua_chan
->enabled
) {
839 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
846 health_code_update(&health_thread_cmd
);
851 * Create the specified event onto the UST tracer for a UST session.
854 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
855 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
859 health_code_update(&health_thread_cmd
);
861 /* Create UST event on tracer */
862 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
865 ERR("Error ustctl create event %s for app pid: %d with ret %d",
866 ua_event
->attr
.name
, app
->pid
, ret
);
870 ua_event
->handle
= ua_event
->obj
->handle
;
872 DBG2("UST app event %s created successfully for pid:%d",
873 ua_event
->attr
.name
, app
->pid
);
875 health_code_update(&health_thread_cmd
);
877 /* Set filter if one is present. */
878 if (ua_event
->filter
) {
879 ret
= set_ust_event_filter(ua_event
, app
);
885 /* If event not enabled, disable it on the tracer */
886 if (ua_event
->enabled
== 0) {
887 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
890 * If we hit an EPERM, something is wrong with our disable call. If
891 * we get an EEXIST, there is a problem on the tracer side since we
895 case -LTTNG_UST_ERR_PERM
:
896 /* Code flow problem */
898 case -LTTNG_UST_ERR_EXIST
:
899 /* It's OK for our use case. */
910 health_code_update(&health_thread_cmd
);
915 * Copy data between an UST app event and a LTT event.
917 static void shadow_copy_event(struct ust_app_event
*ua_event
,
918 struct ltt_ust_event
*uevent
)
920 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
921 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
923 ua_event
->enabled
= uevent
->enabled
;
925 /* Copy event attributes */
926 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
928 /* Copy filter bytecode */
929 if (uevent
->filter
) {
930 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
931 /* Filter might be NULL here in case of ENONEM. */
936 * Copy data between an UST app channel and a LTT channel.
938 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
939 struct ltt_ust_channel
*uchan
)
941 struct lttng_ht_iter iter
;
942 struct ltt_ust_event
*uevent
;
943 struct ltt_ust_context
*uctx
;
944 struct ust_app_event
*ua_event
;
945 struct ust_app_ctx
*ua_ctx
;
947 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
949 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
950 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
951 /* Copy event attributes */
952 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
954 ua_chan
->enabled
= uchan
->enabled
;
956 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
957 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
958 if (ua_ctx
== NULL
) {
961 lttng_ht_node_init_ulong(&ua_ctx
->node
,
962 (unsigned long) ua_ctx
->ctx
.ctx
);
963 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
966 /* Copy all events from ltt ust channel to ust app channel */
967 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
968 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
969 uevent
->filter
, uevent
->attr
.loglevel
);
970 if (ua_event
== NULL
) {
971 DBG2("UST event %s not found on shadow copy channel",
973 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
974 if (ua_event
== NULL
) {
977 shadow_copy_event(ua_event
, uevent
);
978 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
982 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
986 * Copy data between a UST app session and a regular LTT session.
988 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
989 struct ltt_ust_session
*usess
, struct ust_app
*app
)
991 struct lttng_ht_node_str
*ua_chan_node
;
992 struct lttng_ht_iter iter
;
993 struct ltt_ust_channel
*uchan
;
994 struct ust_app_channel
*ua_chan
;
1000 /* Get date and time for unique app path */
1002 timeinfo
= localtime(&rawtime
);
1003 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1005 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1007 ua_sess
->id
= usess
->id
;
1008 ua_sess
->uid
= usess
->uid
;
1009 ua_sess
->gid
= usess
->gid
;
1011 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s-%d-%s/", app
->name
, app
->pid
,
1014 PERROR("asprintf UST shadow copy session");
1015 /* TODO: We cannot return an error from here.. */
1019 /* TODO: support all UST domain */
1021 /* Iterate over all channels in global domain. */
1022 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1024 struct lttng_ht_iter uiter
;
1026 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1027 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1028 if (ua_chan_node
!= NULL
) {
1029 /* Session exist. Contiuing. */
1033 DBG2("Channel %s not found on shadow session copy, creating it",
1035 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1036 if (ua_chan
== NULL
) {
1037 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1041 shadow_copy_channel(ua_chan
, uchan
);
1042 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1047 * Lookup sesison wrapper.
1050 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1051 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1053 /* Get right UST app session from app */
1054 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
1058 * Return ust app session from the app session hashtable using the UST session
1061 static struct ust_app_session
*lookup_session_by_app(
1062 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1064 struct lttng_ht_iter iter
;
1065 struct lttng_ht_node_ulong
*node
;
1067 __lookup_session_by_app(usess
, app
, &iter
);
1068 node
= lttng_ht_iter_get_node_ulong(&iter
);
1073 return caa_container_of(node
, struct ust_app_session
, node
);
1080 * Create a session on the tracer side for the given app.
1082 * On success, ua_sess_ptr is populated with the session pointer or else left
1083 * untouched. If the session was created, is_created is set to 1. On error,
1084 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1087 * Returns 0 on success or else a negative code which is either -ENOMEM or
1088 * -ENOTCONN which is the default code if the ustctl_create_session fails.
1090 static int create_ust_app_session(struct ltt_ust_session
*usess
,
1091 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
1094 int ret
, created
= 0;
1095 struct ust_app_session
*ua_sess
;
1099 assert(ua_sess_ptr
);
1101 health_code_update(&health_thread_cmd
);
1103 ua_sess
= lookup_session_by_app(usess
, app
);
1104 if (ua_sess
== NULL
) {
1105 DBG2("UST app pid: %d session id %d not found, creating it",
1106 app
->pid
, usess
->id
);
1107 ua_sess
= alloc_ust_app_session();
1108 if (ua_sess
== NULL
) {
1109 /* Only malloc can failed so something is really wrong */
1113 shadow_copy_session(ua_sess
, usess
, app
);
1117 health_code_update(&health_thread_cmd
);
1119 if (ua_sess
->handle
== -1) {
1120 ret
= ustctl_create_session(app
->sock
);
1122 ERR("Creating session for app pid %d", app
->pid
);
1123 delete_ust_app_session(-1, ua_sess
);
1124 if (ret
!= -ENOMEM
) {
1126 * Tracer is probably gone or got an internal error so let's
1127 * behave like it will soon unregister or not usable.
1134 ua_sess
->handle
= ret
;
1136 /* Add ust app session to app's HT */
1137 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
1138 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
1140 DBG2("UST app session created successfully with handle %d", ret
);
1143 *ua_sess_ptr
= ua_sess
;
1145 *is_created
= created
;
1147 /* Everything went well. */
1151 health_code_update(&health_thread_cmd
);
1156 * Create a context for the channel on the tracer.
1159 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
1160 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
1161 struct ust_app
*app
)
1164 struct lttng_ht_iter iter
;
1165 struct lttng_ht_node_ulong
*node
;
1166 struct ust_app_ctx
*ua_ctx
;
1168 DBG2("UST app adding context to channel %s", ua_chan
->name
);
1170 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
1171 node
= lttng_ht_iter_get_node_ulong(&iter
);
1177 ua_ctx
= alloc_ust_app_ctx(uctx
);
1178 if (ua_ctx
== NULL
) {
1184 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
1185 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1187 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
1197 * Enable on the tracer side a ust app event for the session and channel.
1200 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
1201 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1205 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1210 ua_event
->enabled
= 1;
1217 * Disable on the tracer side a ust app event for the session and channel.
1219 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
1220 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1224 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1229 ua_event
->enabled
= 0;
1236 * Lookup ust app channel for session and disable it on the tracer side.
1239 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1240 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1244 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1249 ua_chan
->enabled
= 0;
1256 * Lookup ust app channel for session and enable it on the tracer side.
1258 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1259 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1262 struct lttng_ht_iter iter
;
1263 struct lttng_ht_node_str
*ua_chan_node
;
1264 struct ust_app_channel
*ua_chan
;
1266 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1267 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1268 if (ua_chan_node
== NULL
) {
1269 DBG2("Unable to find channel %s in ust session id %u",
1270 uchan
->name
, ua_sess
->id
);
1274 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1276 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1286 * Create UST app channel and create it on the tracer. Set ua_chanp of the
1287 * newly created channel if not NULL.
1289 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
1290 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
1291 struct ust_app_channel
**ua_chanp
)
1294 struct lttng_ht_iter iter
;
1295 struct lttng_ht_node_str
*ua_chan_node
;
1296 struct ust_app_channel
*ua_chan
;
1298 /* Lookup channel in the ust app session */
1299 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1300 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1301 if (ua_chan_node
!= NULL
) {
1302 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1306 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1307 if (ua_chan
== NULL
) {
1308 /* Only malloc can fail here */
1312 shadow_copy_channel(ua_chan
, uchan
);
1314 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1316 /* Not found previously means that it does not exist on the tracer */
1317 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1321 /* Only add the channel if successful on the tracer side. */
1322 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1324 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1329 *ua_chanp
= ua_chan
;
1332 /* Everything went well. */
1336 delete_ust_app_channel(-1, ua_chan
);
1341 * Create UST app event and create it on the tracer side.
1344 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1345 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1346 struct ust_app
*app
)
1349 struct ust_app_event
*ua_event
;
1351 /* Get event node */
1352 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1353 uevent
->filter
, uevent
->attr
.loglevel
);
1354 if (ua_event
!= NULL
) {
1359 /* Does not exist so create one */
1360 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1361 if (ua_event
== NULL
) {
1362 /* Only malloc can failed so something is really wrong */
1366 shadow_copy_event(ua_event
, uevent
);
1368 /* Create it on the tracer side */
1369 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1371 /* Not found previously means that it does not exist on the tracer */
1372 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1376 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
1378 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1385 /* Valid. Calling here is already in a read side lock */
1386 delete_ust_app_event(-1, ua_event
);
1391 * Create UST metadata and open it on the tracer side.
1393 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1394 char *pathname
, struct ust_app
*app
)
1398 if (ua_sess
->metadata
== NULL
) {
1399 /* Allocate UST metadata */
1400 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1401 if (ua_sess
->metadata
== NULL
) {
1402 /* malloc() failed */
1406 ret
= open_ust_metadata(app
, ua_sess
);
1408 DBG3("Opening metadata failed. Cleaning up memory");
1410 /* Cleanup failed metadata struct */
1411 free(ua_sess
->metadata
);
1413 * This is very important because delete_ust_app_session check if
1414 * the pointer is null or not in order to delete the metadata.
1416 ua_sess
->metadata
= NULL
;
1420 DBG2("UST metadata opened for app pid %d", app
->pid
);
1423 /* Open UST metadata stream */
1424 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1425 ret
= create_ust_metadata_stream(app
, ua_sess
);
1430 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1431 "%s/metadata", ua_sess
->path
);
1433 PERROR("asprintf UST create stream");
1437 DBG2("UST metadata stream object created for app pid %d",
1440 ERR("Attempting to create stream without metadata opened");
1451 * Return pointer to traceable apps list.
1453 struct lttng_ht
*ust_app_get_ht(void)
1459 * Return ust app pointer or NULL if not found.
1461 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1463 struct lttng_ht_node_ulong
*node
;
1464 struct lttng_ht_iter iter
;
1467 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1468 node
= lttng_ht_iter_get_node_ulong(&iter
);
1470 DBG2("UST app no found with pid %d", pid
);
1475 DBG2("Found UST app by pid %d", pid
);
1477 return caa_container_of(node
, struct ust_app
, pid_n
);
1485 * Using pid and uid (of the app), allocate a new ust_app struct and
1486 * add it to the global traceable app list.
1488 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1489 * bitness is not supported.
1491 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1493 struct ust_app
*lta
;
1496 if ((msg
->bits_per_long
== 64 &&
1497 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
1498 || (msg
->bits_per_long
== 32 &&
1499 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
1500 ERR("Registration failed: application \"%s\" (pid: %d) has "
1501 "%d-bit long, but no consumerd for this long size is available.\n",
1502 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1507 lttng_fd_put(LTTNG_FD_APPS
, 1);
1510 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1511 ERR("Registration failed: application \"%s\" (pid: %d) has "
1512 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1513 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1518 lttng_fd_put(LTTNG_FD_APPS
, 1);
1521 lta
= zmalloc(sizeof(struct ust_app
));
1527 lta
->ppid
= msg
->ppid
;
1528 lta
->uid
= msg
->uid
;
1529 lta
->gid
= msg
->gid
;
1530 lta
->compatible
= 0; /* Not compatible until proven */
1531 lta
->bits_per_long
= msg
->bits_per_long
;
1532 lta
->v_major
= msg
->major
;
1533 lta
->v_minor
= msg
->minor
;
1534 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1535 lta
->name
[16] = '\0';
1536 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1538 lta
->pid
= msg
->pid
;
1539 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1541 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1543 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
1548 * On a re-registration, we want to kick out the previous registration of
1551 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1554 * The socket _should_ be unique until _we_ call close. So, a add_unique
1555 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1556 * already in the table.
1558 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1562 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1563 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1564 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1570 * Unregister app by removing it from the global traceable app list and freeing
1573 * The socket is already closed at this point so no close to sock.
1575 void ust_app_unregister(int sock
)
1577 struct ust_app
*lta
;
1578 struct lttng_ht_node_ulong
*node
;
1579 struct lttng_ht_iter iter
;
1580 struct ust_app_session
*ua_sess
;
1585 /* Get the node reference for a call_rcu */
1586 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1587 node
= lttng_ht_iter_get_node_ulong(&iter
);
1589 ERR("Unable to find app by sock %d", sock
);
1593 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1595 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1597 /* Remove application from PID hash table */
1598 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1601 /* Assign second node for deletion */
1602 iter
.iter
.node
= <a
->pid_n
.node
;
1605 * Ignore return value since the node might have been removed before by an
1606 * add replace during app registration because the PID can be reassigned by
1609 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1611 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1615 /* Remove sessions so they are not visible during deletion.*/
1616 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
1618 ret
= lttng_ht_del(lta
->sessions
, &iter
);
1620 /* The session was already removed so scheduled for teardown. */
1625 * Add session to list for teardown. This is safe since at this point we
1626 * are the only one using this list.
1628 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
1632 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1640 * Return traceable_app_count
1642 unsigned long ust_app_list_count(void)
1644 unsigned long count
;
1647 count
= lttng_ht_get_count(ust_app_ht
);
1654 * Fill events array with all events name of all registered apps.
1656 int ust_app_list_events(struct lttng_event
**events
)
1659 size_t nbmem
, count
= 0;
1660 struct lttng_ht_iter iter
;
1661 struct ust_app
*app
;
1662 struct lttng_event
*tmp_event
;
1664 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1665 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1666 if (tmp_event
== NULL
) {
1667 PERROR("zmalloc ust app events");
1674 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1675 struct lttng_ust_tracepoint_iter uiter
;
1677 health_code_update(&health_thread_cmd
);
1679 if (!app
->compatible
) {
1681 * TODO: In time, we should notice the caller of this error by
1682 * telling him that this is a version error.
1686 handle
= ustctl_tracepoint_list(app
->sock
);
1688 ERR("UST app list events getting handle failed for app pid %d",
1693 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
1694 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1695 health_code_update(&health_thread_cmd
);
1696 if (count
>= nbmem
) {
1697 /* In case the realloc fails, we free the memory */
1700 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1703 ptr
= realloc(tmp_event
, nbmem
* sizeof(struct lttng_event
));
1705 PERROR("realloc ust app events");
1712 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1713 tmp_event
[count
].loglevel
= uiter
.loglevel
;
1714 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
1715 tmp_event
[count
].pid
= app
->pid
;
1716 tmp_event
[count
].enabled
= -1;
1722 *events
= tmp_event
;
1724 DBG2("UST app list events done (%zu events)", count
);
1729 health_code_update(&health_thread_cmd
);
1734 * Fill events array with all events name of all registered apps.
1736 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
1739 size_t nbmem
, count
= 0;
1740 struct lttng_ht_iter iter
;
1741 struct ust_app
*app
;
1742 struct lttng_event_field
*tmp_event
;
1744 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1745 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
1746 if (tmp_event
== NULL
) {
1747 PERROR("zmalloc ust app event fields");
1754 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1755 struct lttng_ust_field_iter uiter
;
1757 health_code_update(&health_thread_cmd
);
1759 if (!app
->compatible
) {
1761 * TODO: In time, we should notice the caller of this error by
1762 * telling him that this is a version error.
1766 handle
= ustctl_tracepoint_field_list(app
->sock
);
1768 ERR("UST app list event fields getting handle failed for app pid %d",
1773 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
1774 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1775 health_code_update(&health_thread_cmd
);
1776 if (count
>= nbmem
) {
1777 /* In case the realloc fails, we free the memory */
1780 DBG2("Reallocating event field list from %zu to %zu entries", nbmem
,
1783 ptr
= realloc(tmp_event
, nbmem
* sizeof(struct lttng_event_field
));
1785 PERROR("realloc ust app event fields");
1793 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
1794 tmp_event
[count
].type
= uiter
.type
;
1795 tmp_event
[count
].nowrite
= uiter
.nowrite
;
1797 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1798 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
1799 tmp_event
[count
].event
.type
= LTTNG_UST_TRACEPOINT
;
1800 tmp_event
[count
].event
.pid
= app
->pid
;
1801 tmp_event
[count
].event
.enabled
= -1;
1807 *fields
= tmp_event
;
1809 DBG2("UST app list event fields done (%zu events)", count
);
1814 health_code_update(&health_thread_cmd
);
1819 * Free and clean all traceable apps of the global list.
1821 void ust_app_clean_list(void)
1824 struct ust_app
*app
;
1825 struct lttng_ht_iter iter
;
1827 DBG2("UST app cleaning registered apps hash table");
1831 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1832 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1834 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
1837 /* Cleanup socket hash table */
1838 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
1840 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1844 /* Destroy is done only when the ht is empty */
1845 lttng_ht_destroy(ust_app_ht
);
1846 lttng_ht_destroy(ust_app_ht_by_sock
);
1852 * Init UST app hash table.
1854 void ust_app_ht_alloc(void)
1856 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1857 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1861 * For a specific UST session, disable the channel for all registered apps.
1863 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1864 struct ltt_ust_channel
*uchan
)
1867 struct lttng_ht_iter iter
;
1868 struct lttng_ht_node_str
*ua_chan_node
;
1869 struct ust_app
*app
;
1870 struct ust_app_session
*ua_sess
;
1871 struct ust_app_channel
*ua_chan
;
1873 if (usess
== NULL
|| uchan
== NULL
) {
1874 ERR("Disabling UST global channel with NULL values");
1879 DBG2("UST app disabling channel %s from global domain for session id %d",
1880 uchan
->name
, usess
->id
);
1884 /* For every registered applications */
1885 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1886 struct lttng_ht_iter uiter
;
1887 if (!app
->compatible
) {
1889 * TODO: In time, we should notice the caller of this error by
1890 * telling him that this is a version error.
1894 ua_sess
= lookup_session_by_app(usess
, app
);
1895 if (ua_sess
== NULL
) {
1900 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1901 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1902 /* If the session if found for the app, the channel must be there */
1903 assert(ua_chan_node
);
1905 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1906 /* The channel must not be already disabled */
1907 assert(ua_chan
->enabled
== 1);
1909 /* Disable channel onto application */
1910 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1912 /* XXX: We might want to report this error at some point... */
1924 * For a specific UST session, enable the channel for all registered apps.
1926 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1927 struct ltt_ust_channel
*uchan
)
1930 struct lttng_ht_iter iter
;
1931 struct ust_app
*app
;
1932 struct ust_app_session
*ua_sess
;
1934 if (usess
== NULL
|| uchan
== NULL
) {
1935 ERR("Adding UST global channel to NULL values");
1940 DBG2("UST app enabling channel %s to global domain for session id %d",
1941 uchan
->name
, usess
->id
);
1945 /* For every registered applications */
1946 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1947 if (!app
->compatible
) {
1949 * TODO: In time, we should notice the caller of this error by
1950 * telling him that this is a version error.
1954 ua_sess
= lookup_session_by_app(usess
, app
);
1955 if (ua_sess
== NULL
) {
1959 /* Enable channel onto application */
1960 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1962 /* XXX: We might want to report this error at some point... */
1974 * Disable an event in a channel and for a specific session.
1976 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1977 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1980 struct lttng_ht_iter iter
, uiter
;
1981 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1982 struct ust_app
*app
;
1983 struct ust_app_session
*ua_sess
;
1984 struct ust_app_channel
*ua_chan
;
1985 struct ust_app_event
*ua_event
;
1987 DBG("UST app disabling event %s for all apps in channel "
1988 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1992 /* For all registered applications */
1993 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1994 if (!app
->compatible
) {
1996 * TODO: In time, we should notice the caller of this error by
1997 * telling him that this is a version error.
2001 ua_sess
= lookup_session_by_app(usess
, app
);
2002 if (ua_sess
== NULL
) {
2007 /* Lookup channel in the ust app session */
2008 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2009 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2010 if (ua_chan_node
== NULL
) {
2011 DBG2("Channel %s not found in session id %d for app pid %d."
2012 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
2015 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2017 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
2018 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
2019 if (ua_event_node
== NULL
) {
2020 DBG2("Event %s not found in channel %s for app pid %d."
2021 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
2024 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2026 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2028 /* XXX: Report error someday... */
2039 * For a specific UST session and UST channel, the event for all
2042 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
2043 struct ltt_ust_channel
*uchan
)
2046 struct lttng_ht_iter iter
, uiter
;
2047 struct lttng_ht_node_str
*ua_chan_node
;
2048 struct ust_app
*app
;
2049 struct ust_app_session
*ua_sess
;
2050 struct ust_app_channel
*ua_chan
;
2051 struct ust_app_event
*ua_event
;
2053 DBG("UST app disabling all event for all apps in channel "
2054 "%s for session id %d", uchan
->name
, usess
->id
);
2058 /* For all registered applications */
2059 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2060 if (!app
->compatible
) {
2062 * TODO: In time, we should notice the caller of this error by
2063 * telling him that this is a version error.
2067 ua_sess
= lookup_session_by_app(usess
, app
);
2069 /* The application has problem or is probably dead. */
2073 /* Lookup channel in the ust app session */
2074 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2075 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2076 /* If the channel is not found, there is a code flow error */
2077 assert(ua_chan_node
);
2079 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2081 /* Disable each events of channel */
2082 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2084 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2086 /* XXX: Report error someday... */
2098 * For a specific UST session, create the channel for all registered apps.
2100 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
2101 struct ltt_ust_channel
*uchan
)
2103 int ret
= 0, created
;
2104 struct lttng_ht_iter iter
;
2105 struct ust_app
*app
;
2106 struct ust_app_session
*ua_sess
= NULL
;
2108 /* Very wrong code flow */
2112 DBG2("UST app adding channel %s to global domain for session id %d",
2113 uchan
->name
, usess
->id
);
2117 /* For every registered applications */
2118 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2119 if (!app
->compatible
) {
2121 * TODO: In time, we should notice the caller of this error by
2122 * telling him that this is a version error.
2127 * Create session on the tracer side and add it to app session HT. Note
2128 * that if session exist, it will simply return a pointer to the ust
2131 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
2136 * The application's socket is not valid. Either a bad socket
2137 * or a timeout on it. We can't inform the caller that for a
2138 * specific app, the session failed so lets continue here.
2143 goto error_rcu_unlock
;
2148 /* Create channel onto application. We don't need the chan ref. */
2149 ret
= create_ust_app_channel(ua_sess
, uchan
, app
, NULL
);
2151 if (ret
== -ENOMEM
) {
2152 /* No more memory is a fatal error. Stop right now. */
2153 goto error_rcu_unlock
;
2155 /* Cleanup the created session if it's the case. */
2157 delete_ust_app_session(app
->sock
, ua_sess
);
2168 * Enable event for a specific session and channel on the tracer.
2170 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
2171 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2174 struct lttng_ht_iter iter
, uiter
;
2175 struct lttng_ht_node_str
*ua_chan_node
;
2176 struct ust_app
*app
;
2177 struct ust_app_session
*ua_sess
;
2178 struct ust_app_channel
*ua_chan
;
2179 struct ust_app_event
*ua_event
;
2181 DBG("UST app enabling event %s for all apps for session id %d",
2182 uevent
->attr
.name
, usess
->id
);
2185 * NOTE: At this point, this function is called only if the session and
2186 * channel passed are already created for all apps. and enabled on the
2192 /* For all registered applications */
2193 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2194 if (!app
->compatible
) {
2196 * TODO: In time, we should notice the caller of this error by
2197 * telling him that this is a version error.
2201 ua_sess
= lookup_session_by_app(usess
, app
);
2203 /* The application has problem or is probably dead. */
2207 /* Lookup channel in the ust app session */
2208 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2209 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2210 /* If the channel is not found, there is a code flow error */
2211 assert(ua_chan_node
);
2213 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2215 /* Get event node */
2216 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2217 uevent
->filter
, uevent
->attr
.loglevel
);
2218 if (ua_event
== NULL
) {
2219 DBG3("UST app enable event %s not found for app PID %d."
2220 "Skipping app", uevent
->attr
.name
, app
->pid
);
2224 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2236 * For a specific existing UST session and UST channel, creates the event for
2237 * all registered apps.
2239 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
2240 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2243 struct lttng_ht_iter iter
, uiter
;
2244 struct lttng_ht_node_str
*ua_chan_node
;
2245 struct ust_app
*app
;
2246 struct ust_app_session
*ua_sess
;
2247 struct ust_app_channel
*ua_chan
;
2249 DBG("UST app creating event %s for all apps for session id %d",
2250 uevent
->attr
.name
, usess
->id
);
2254 /* For all registered applications */
2255 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2256 if (!app
->compatible
) {
2258 * TODO: In time, we should notice the caller of this error by
2259 * telling him that this is a version error.
2263 ua_sess
= lookup_session_by_app(usess
, app
);
2265 /* The application has problem or is probably dead. */
2269 /* Lookup channel in the ust app session */
2270 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2271 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2272 /* If the channel is not found, there is a code flow error */
2273 assert(ua_chan_node
);
2275 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2277 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2279 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
2280 /* Possible value at this point: -ENOMEM. If so, we stop! */
2283 DBG2("UST app event %s already exist on app PID %d",
2284 uevent
->attr
.name
, app
->pid
);
2295 * Start tracing for a specific UST session and app.
2297 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2300 struct lttng_ht_iter iter
;
2301 struct ust_app_session
*ua_sess
;
2302 struct ust_app_channel
*ua_chan
;
2303 struct ltt_ust_stream
*ustream
;
2304 struct consumer_socket
*socket
;
2306 DBG("Starting tracing for ust app pid %d", app
->pid
);
2310 if (!app
->compatible
) {
2314 ua_sess
= lookup_session_by_app(usess
, app
);
2315 if (ua_sess
== NULL
) {
2316 /* The session is in teardown process. Ignore and continue. */
2320 /* Upon restart, we skip the setup, already done */
2321 if (ua_sess
->started
) {
2325 /* Create directories if consumer is LOCAL and has a path defined. */
2326 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2327 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
2328 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
2329 S_IRWXU
| S_IRWXG
, usess
->uid
, usess
->gid
);
2331 if (ret
!= -EEXIST
) {
2332 ERR("Trace directory creation error");
2334 goto error_rcu_unlock
;
2339 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
2341 ret
= LTTNG_ERR_UST_META_FAIL
;
2342 goto error_rcu_unlock
;
2345 /* For each channel */
2346 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2348 /* Create all streams */
2350 /* Create UST stream */
2351 ustream
= zmalloc(sizeof(*ustream
));
2352 if (ustream
== NULL
) {
2353 PERROR("zmalloc ust stream");
2354 goto error_rcu_unlock
;
2357 health_code_update(&health_thread_cmd
);
2359 ret
= create_ust_stream(app
, ua_chan
, ustream
);
2361 /* Free unused memory after this point. */
2363 if (ret
== -LTTNG_UST_ERR_NOENT
) {
2364 /* Got all streams. Continue normal execution. */
2367 /* Error at this point. Stop everything. */
2368 ret
= LTTNG_ERR_UST_STREAM_FAIL
;
2369 goto error_rcu_unlock
;
2372 health_code_update(&health_thread_cmd
);
2374 /* Order is important */
2375 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2376 ret
= snprintf(ustream
->name
, sizeof(ustream
->name
), "%s_%u",
2377 ua_chan
->name
, ua_chan
->streams
.count
);
2378 ua_chan
->streams
.count
++;
2380 PERROR("asprintf UST create stream");
2382 * XXX what should we do here with the
2387 DBG2("UST stream %d ready (handle: %d)", ua_chan
->streams
.count
,
2391 health_code_update(&health_thread_cmd
);
2394 switch (app
->bits_per_long
) {
2396 socket
= consumer_find_socket(uatomic_read(&ust_consumerd64_fd
),
2398 if (socket
== NULL
) {
2403 socket
= consumer_find_socket(uatomic_read(&ust_consumerd32_fd
),
2405 if (socket
== NULL
) {
2411 goto error_rcu_unlock
;
2414 /* Setup UST consumer socket and send fds to it */
2415 ret
= ust_consumer_send_session(ua_sess
, usess
->consumer
, socket
);
2417 goto error_rcu_unlock
;
2420 health_code_update(&health_thread_cmd
);
2423 /* This start the UST tracing */
2424 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2426 ERR("Error starting tracing for app pid: %d (ret: %d)", app
->pid
, ret
);
2427 goto error_rcu_unlock
;
2430 /* Indicate that the session has been started once */
2431 ua_sess
->started
= 1;
2433 health_code_update(&health_thread_cmd
);
2435 /* Quiescent wait after starting trace */
2436 ustctl_wait_quiescent(app
->sock
);
2440 health_code_update(&health_thread_cmd
);
2445 health_code_update(&health_thread_cmd
);
2450 * Stop tracing for a specific UST session and app.
2452 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2455 struct lttng_ht_iter iter
;
2456 struct ust_app_session
*ua_sess
;
2457 struct ust_app_channel
*ua_chan
;
2459 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2463 if (!app
->compatible
) {
2467 ua_sess
= lookup_session_by_app(usess
, app
);
2468 if (ua_sess
== NULL
) {
2473 * If started = 0, it means that stop trace has been called for a session
2474 * that was never started. It's possible since we can have a fail start
2475 * from either the application manager thread or the command thread. Simply
2476 * indicate that this is a stop error.
2478 if (!ua_sess
->started
) {
2479 goto error_rcu_unlock
;
2482 health_code_update(&health_thread_cmd
);
2484 /* This inhibits UST tracing */
2485 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2487 ERR("Error stopping tracing for app pid: %d (ret: %d)", app
->pid
, ret
);
2488 goto error_rcu_unlock
;
2491 health_code_update(&health_thread_cmd
);
2493 /* Quiescent wait after stopping trace */
2494 ustctl_wait_quiescent(app
->sock
);
2496 health_code_update(&health_thread_cmd
);
2498 /* Flushing buffers */
2499 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2501 health_code_update(&health_thread_cmd
);
2502 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2504 ERR("UST app PID %d channel %s flush failed with ret %d",
2505 app
->pid
, ua_chan
->name
, ret
);
2506 /* Continuing flushing all buffers */
2511 health_code_update(&health_thread_cmd
);
2513 /* Flush all buffers before stopping */
2514 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2516 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2522 health_code_update(&health_thread_cmd
);
2527 health_code_update(&health_thread_cmd
);
2532 * Destroy a specific UST session in apps.
2534 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2536 struct ust_app_session
*ua_sess
;
2537 struct lttng_ust_object_data obj
;
2538 struct lttng_ht_iter iter
;
2539 struct lttng_ht_node_ulong
*node
;
2542 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2546 if (!app
->compatible
) {
2550 __lookup_session_by_app(usess
, app
, &iter
);
2551 node
= lttng_ht_iter_get_node_ulong(&iter
);
2553 /* Session is being or is deleted. */
2556 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2557 ret
= lttng_ht_del(app
->sessions
, &iter
);
2559 /* Already scheduled for teardown. */
2563 obj
.handle
= ua_sess
->handle
;
2566 obj
.memory_map_size
= 0;
2567 health_code_update(&health_thread_cmd
);
2568 ustctl_release_object(app
->sock
, &obj
);
2570 health_code_update(&health_thread_cmd
);
2571 delete_ust_app_session(app
->sock
, ua_sess
);
2573 /* Quiescent wait after stopping trace */
2574 ustctl_wait_quiescent(app
->sock
);
2578 health_code_update(&health_thread_cmd
);
2583 * Start tracing for the UST session.
2585 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2588 struct lttng_ht_iter iter
;
2589 struct ust_app
*app
;
2591 DBG("Starting all UST traces");
2595 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2596 ret
= ust_app_start_trace(usess
, app
);
2598 /* Continue to next apps even on error */
2609 * Start tracing for the UST session.
2611 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2614 struct lttng_ht_iter iter
;
2615 struct ust_app
*app
;
2617 DBG("Stopping all UST traces");
2621 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2622 ret
= ust_app_stop_trace(usess
, app
);
2624 /* Continue to next apps even on error */
2635 * Destroy app UST session.
2637 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2640 struct lttng_ht_iter iter
;
2641 struct ust_app
*app
;
2643 DBG("Destroy all UST traces");
2647 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2648 ret
= destroy_trace(usess
, app
);
2650 /* Continue to next apps even on error */
2661 * Add channels/events from UST global domain to registered apps at sock.
2663 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2666 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2667 struct ust_app
*app
;
2668 struct ust_app_session
*ua_sess
= NULL
;
2669 struct ust_app_channel
*ua_chan
;
2670 struct ust_app_event
*ua_event
;
2671 struct ust_app_ctx
*ua_ctx
;
2675 DBG2("UST app global update for app sock %d for session id %d", sock
,
2680 app
= find_app_by_sock(sock
);
2682 ERR("Failed to update app sock %d", sock
);
2686 if (!app
->compatible
) {
2690 ret
= create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
2692 /* Tracer is probably gone or ENOMEM. */
2698 * We can iterate safely here over all UST app session sicne the create ust
2699 * app session above made a shadow copy of the UST global domain from the
2702 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2704 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2706 /* FIXME: Should we quit here or continue... */
2710 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2712 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2714 /* FIXME: Should we quit here or continue... */
2720 /* For each events */
2721 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2723 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2725 /* FIXME: Should we quit here or continue... */
2731 if (usess
->start_trace
) {
2732 ret
= ust_app_start_trace(usess
, app
);
2737 DBG2("UST trace started for app pid %d", app
->pid
);
2746 * Add context to a specific channel for global UST domain.
2748 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2749 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2752 struct lttng_ht_node_str
*ua_chan_node
;
2753 struct lttng_ht_iter iter
, uiter
;
2754 struct ust_app_channel
*ua_chan
= NULL
;
2755 struct ust_app_session
*ua_sess
;
2756 struct ust_app
*app
;
2760 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2761 if (!app
->compatible
) {
2763 * TODO: In time, we should notice the caller of this error by
2764 * telling him that this is a version error.
2768 ua_sess
= lookup_session_by_app(usess
, app
);
2769 if (ua_sess
== NULL
) {
2773 /* Lookup channel in the ust app session */
2774 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2775 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2776 if (ua_chan_node
== NULL
) {
2779 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2782 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2793 * Enable event for a channel from a UST session for a specific PID.
2795 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2796 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2799 struct lttng_ht_iter iter
;
2800 struct lttng_ht_node_str
*ua_chan_node
;
2801 struct ust_app
*app
;
2802 struct ust_app_session
*ua_sess
;
2803 struct ust_app_channel
*ua_chan
;
2804 struct ust_app_event
*ua_event
;
2806 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2810 app
= ust_app_find_by_pid(pid
);
2812 ERR("UST app enable event per PID %d not found", pid
);
2817 if (!app
->compatible
) {
2822 ua_sess
= lookup_session_by_app(usess
, app
);
2824 /* The application has problem or is probably dead. */
2828 /* Lookup channel in the ust app session */
2829 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2830 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2831 /* If the channel is not found, there is a code flow error */
2832 assert(ua_chan_node
);
2834 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2836 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2837 uevent
->filter
, uevent
->attr
.loglevel
);
2838 if (ua_event
== NULL
) {
2839 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2844 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2856 * Disable event for a channel from a UST session for a specific PID.
2858 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2859 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2862 struct lttng_ht_iter iter
;
2863 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2864 struct ust_app
*app
;
2865 struct ust_app_session
*ua_sess
;
2866 struct ust_app_channel
*ua_chan
;
2867 struct ust_app_event
*ua_event
;
2869 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2873 app
= ust_app_find_by_pid(pid
);
2875 ERR("UST app disable event per PID %d not found", pid
);
2880 if (!app
->compatible
) {
2885 ua_sess
= lookup_session_by_app(usess
, app
);
2887 /* The application has problem or is probably dead. */
2891 /* Lookup channel in the ust app session */
2892 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2893 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2894 if (ua_chan_node
== NULL
) {
2895 /* Channel does not exist, skip disabling */
2898 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2900 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2901 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2902 if (ua_event_node
== NULL
) {
2903 /* Event does not exist, skip disabling */
2906 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2908 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2919 * Validate version of UST apps and set the compatible bit.
2921 int ust_app_validate_version(int sock
)
2924 struct ust_app
*app
;
2928 app
= find_app_by_sock(sock
);
2931 health_code_update(&health_thread_cmd
);
2933 ret
= ustctl_tracer_version(sock
, &app
->version
);
2938 /* Validate version */
2939 if (app
->version
.major
!= UST_APP_MAJOR_VERSION
) {
2943 DBG2("UST app PID %d is compatible with internal major version %d "
2944 "(supporting == %d)", app
->pid
, app
->version
.major
,
2945 UST_APP_MAJOR_VERSION
);
2946 app
->compatible
= 1;
2948 health_code_update(&health_thread_cmd
);
2952 DBG2("UST app PID %d is not compatible with internal major version %d "
2953 "(supporting == %d)", app
->pid
, app
->version
.major
,
2954 UST_APP_MAJOR_VERSION
);
2955 app
->compatible
= 0;
2957 health_code_update(&health_thread_cmd
);
2962 * Calibrate registered applications.
2964 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2967 struct lttng_ht_iter iter
;
2968 struct ust_app
*app
;
2972 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2973 if (!app
->compatible
) {
2975 * TODO: In time, we should notice the caller of this error by
2976 * telling him that this is a version error.
2981 health_code_update(&health_thread_cmd
);
2983 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2987 /* Means that it's not implemented on the tracer side. */
2991 /* TODO: Report error to user */
2992 DBG2("Calibrate app PID %d returned with error %d",
2999 DBG("UST app global domain calibration finished");
3003 health_code_update(&health_thread_cmd
);