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 stream onto the UST tracer for a UST session.
726 static int create_ust_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 ERR("UST create metadata stream failed");
747 health_code_update(&health_thread_cmd
);
752 * Create the specified channel onto the UST tracer for a UST session.
754 static int create_ust_channel(struct ust_app
*app
,
755 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
759 health_code_update(&health_thread_cmd
);
761 /* TODO: remove cast and use lttng-ust-abi.h */
763 /* We are going to receive 2 fds, we need to reserve them. */
764 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
766 ERR("Exhausted number of available FD upon create channel");
770 health_code_update(&health_thread_cmd
);
772 ret
= ustctl_create_channel(app
->sock
, ua_sess
->handle
,
773 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
775 ERR("Creating channel %s for app (pid: %d, sock: %d) "
776 "and session handle %d with ret %d",
777 ua_chan
->name
, app
->pid
, app
->sock
,
778 ua_sess
->handle
, ret
);
779 lttng_fd_put(LTTNG_FD_APPS
, 2);
783 ua_chan
->handle
= ua_chan
->obj
->handle
;
785 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
786 ua_chan
->name
, app
->pid
, app
->sock
);
788 health_code_update(&health_thread_cmd
);
790 /* If channel is not enabled, disable it on the tracer */
791 if (!ua_chan
->enabled
) {
792 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
799 health_code_update(&health_thread_cmd
);
804 * Create the specified event onto the UST tracer for a UST session.
807 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
808 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
812 health_code_update(&health_thread_cmd
);
814 /* Create UST event on tracer */
815 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
818 ERR("Error ustctl create event %s for app pid: %d with ret %d",
819 ua_event
->attr
.name
, app
->pid
, ret
);
823 ua_event
->handle
= ua_event
->obj
->handle
;
825 DBG2("UST app event %s created successfully for pid:%d",
826 ua_event
->attr
.name
, app
->pid
);
828 health_code_update(&health_thread_cmd
);
830 /* Set filter if one is present. */
831 if (ua_event
->filter
) {
832 ret
= set_ust_event_filter(ua_event
, app
);
838 /* If event not enabled, disable it on the tracer */
839 if (ua_event
->enabled
== 0) {
840 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
843 * If we hit an EPERM, something is wrong with our disable call. If
844 * we get an EEXIST, there is a problem on the tracer side since we
848 case -LTTNG_UST_ERR_PERM
:
849 /* Code flow problem */
851 case -LTTNG_UST_ERR_EXIST
:
852 /* It's OK for our use case. */
863 health_code_update(&health_thread_cmd
);
868 * Copy data between an UST app event and a LTT event.
870 static void shadow_copy_event(struct ust_app_event
*ua_event
,
871 struct ltt_ust_event
*uevent
)
873 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
874 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
876 ua_event
->enabled
= uevent
->enabled
;
878 /* Copy event attributes */
879 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
881 /* Copy filter bytecode */
882 if (uevent
->filter
) {
883 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
884 /* Filter might be NULL here in case of ENONEM. */
889 * Copy data between an UST app channel and a LTT channel.
891 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
892 struct ltt_ust_channel
*uchan
)
894 struct lttng_ht_iter iter
;
895 struct ltt_ust_event
*uevent
;
896 struct ltt_ust_context
*uctx
;
897 struct ust_app_event
*ua_event
;
898 struct ust_app_ctx
*ua_ctx
;
900 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
902 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
903 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
904 /* Copy event attributes */
905 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
907 ua_chan
->enabled
= uchan
->enabled
;
909 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
910 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
911 if (ua_ctx
== NULL
) {
914 lttng_ht_node_init_ulong(&ua_ctx
->node
,
915 (unsigned long) ua_ctx
->ctx
.ctx
);
916 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
919 /* Copy all events from ltt ust channel to ust app channel */
920 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
921 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
922 uevent
->filter
, uevent
->attr
.loglevel
);
923 if (ua_event
== NULL
) {
924 DBG2("UST event %s not found on shadow copy channel",
926 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
927 if (ua_event
== NULL
) {
930 shadow_copy_event(ua_event
, uevent
);
931 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
935 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
939 * Copy data between a UST app session and a regular LTT session.
941 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
942 struct ltt_ust_session
*usess
, struct ust_app
*app
)
944 struct lttng_ht_node_str
*ua_chan_node
;
945 struct lttng_ht_iter iter
;
946 struct ltt_ust_channel
*uchan
;
947 struct ust_app_channel
*ua_chan
;
953 /* Get date and time for unique app path */
955 timeinfo
= localtime(&rawtime
);
956 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
958 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
960 ua_sess
->id
= usess
->id
;
961 ua_sess
->uid
= usess
->uid
;
962 ua_sess
->gid
= usess
->gid
;
964 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s-%d-%s/", app
->name
, app
->pid
,
967 PERROR("asprintf UST shadow copy session");
968 /* TODO: We cannot return an error from here.. */
972 /* TODO: support all UST domain */
974 /* Iterate over all channels in global domain. */
975 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
977 struct lttng_ht_iter uiter
;
979 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
980 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
981 if (ua_chan_node
!= NULL
) {
982 /* Session exist. Contiuing. */
986 DBG2("Channel %s not found on shadow session copy, creating it",
988 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
989 if (ua_chan
== NULL
) {
990 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
994 shadow_copy_channel(ua_chan
, uchan
);
995 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1000 * Lookup sesison wrapper.
1003 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1004 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1006 /* Get right UST app session from app */
1007 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
1011 * Return ust app session from the app session hashtable using the UST session
1014 static struct ust_app_session
*lookup_session_by_app(
1015 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1017 struct lttng_ht_iter iter
;
1018 struct lttng_ht_node_ulong
*node
;
1020 __lookup_session_by_app(usess
, app
, &iter
);
1021 node
= lttng_ht_iter_get_node_ulong(&iter
);
1026 return caa_container_of(node
, struct ust_app_session
, node
);
1033 * Create a UST session onto the tracer of app and add it the session
1036 * Return ust app session or NULL on error.
1038 static struct ust_app_session
*create_ust_app_session(
1039 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1042 struct ust_app_session
*ua_sess
;
1044 health_code_update(&health_thread_cmd
);
1046 ua_sess
= lookup_session_by_app(usess
, app
);
1047 if (ua_sess
== NULL
) {
1048 DBG2("UST app pid: %d session id %d not found, creating it",
1049 app
->pid
, usess
->id
);
1050 ua_sess
= alloc_ust_app_session();
1051 if (ua_sess
== NULL
) {
1052 /* Only malloc can failed so something is really wrong */
1055 shadow_copy_session(ua_sess
, usess
, app
);
1058 health_code_update(&health_thread_cmd
);
1060 if (ua_sess
->handle
== -1) {
1061 ret
= ustctl_create_session(app
->sock
);
1063 ERR("Creating session for app pid %d", app
->pid
);
1064 delete_ust_app_session(-1, ua_sess
);
1065 /* This means that the tracer is gone... */
1066 ua_sess
= (void*) -1UL;
1070 ua_sess
->handle
= ret
;
1072 /* Add ust app session to app's HT */
1073 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
1074 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
1076 DBG2("UST app session created successfully with handle %d", ret
);
1080 health_code_update(&health_thread_cmd
);
1085 * Create a context for the channel on the tracer.
1088 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
1089 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
1090 struct ust_app
*app
)
1093 struct lttng_ht_iter iter
;
1094 struct lttng_ht_node_ulong
*node
;
1095 struct ust_app_ctx
*ua_ctx
;
1097 DBG2("UST app adding context to channel %s", ua_chan
->name
);
1099 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
1100 node
= lttng_ht_iter_get_node_ulong(&iter
);
1106 ua_ctx
= alloc_ust_app_ctx(uctx
);
1107 if (ua_ctx
== NULL
) {
1113 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
1114 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1116 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
1126 * Enable on the tracer side a ust app event for the session and channel.
1129 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
1130 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1134 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1139 ua_event
->enabled
= 1;
1146 * Disable on the tracer side a ust app event for the session and channel.
1148 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
1149 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1153 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1158 ua_event
->enabled
= 0;
1165 * Lookup ust app channel for session and disable it on the tracer side.
1168 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1169 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1173 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1178 ua_chan
->enabled
= 0;
1185 * Lookup ust app channel for session and enable it on the tracer side.
1187 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1188 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1191 struct lttng_ht_iter iter
;
1192 struct lttng_ht_node_str
*ua_chan_node
;
1193 struct ust_app_channel
*ua_chan
;
1195 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1196 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1197 if (ua_chan_node
== NULL
) {
1198 DBG2("Unable to find channel %s in ust session id %u",
1199 uchan
->name
, ua_sess
->id
);
1203 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1205 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1215 * Create UST app channel and create it on the tracer.
1217 static struct ust_app_channel
*create_ust_app_channel(
1218 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
1219 struct ust_app
*app
)
1222 struct lttng_ht_iter iter
;
1223 struct lttng_ht_node_str
*ua_chan_node
;
1224 struct ust_app_channel
*ua_chan
;
1226 /* Lookup channel in the ust app session */
1227 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1228 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1229 if (ua_chan_node
!= NULL
) {
1230 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1234 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1235 if (ua_chan
== NULL
) {
1236 /* Only malloc can fail here */
1239 shadow_copy_channel(ua_chan
, uchan
);
1241 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1243 /* Not found previously means that it does not exist on the tracer */
1244 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1248 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1250 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1257 delete_ust_app_channel(-1, ua_chan
);
1262 * Create UST app event and create it on the tracer side.
1265 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1266 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1267 struct ust_app
*app
)
1270 struct ust_app_event
*ua_event
;
1272 /* Get event node */
1273 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1274 uevent
->filter
, uevent
->attr
.loglevel
);
1275 if (ua_event
!= NULL
) {
1280 /* Does not exist so create one */
1281 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1282 if (ua_event
== NULL
) {
1283 /* Only malloc can failed so something is really wrong */
1287 shadow_copy_event(ua_event
, uevent
);
1289 /* Create it on the tracer side */
1290 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1292 /* Not found previously means that it does not exist on the tracer */
1293 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1297 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
1299 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1306 /* Valid. Calling here is already in a read side lock */
1307 delete_ust_app_event(-1, ua_event
);
1312 * Create UST metadata and open it on the tracer side.
1314 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1315 char *pathname
, struct ust_app
*app
)
1319 if (ua_sess
->metadata
== NULL
) {
1320 /* Allocate UST metadata */
1321 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1322 if (ua_sess
->metadata
== NULL
) {
1323 /* malloc() failed */
1327 ret
= open_ust_metadata(app
, ua_sess
);
1329 DBG3("Opening metadata failed. Cleaning up memory");
1331 /* Cleanup failed metadata struct */
1332 free(ua_sess
->metadata
);
1334 * This is very important because delete_ust_app_session check if
1335 * the pointer is null or not in order to delete the metadata.
1337 ua_sess
->metadata
= NULL
;
1341 DBG2("UST metadata opened for app pid %d", app
->pid
);
1344 /* Open UST metadata stream */
1345 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1346 ret
= create_ust_stream(app
, ua_sess
);
1351 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1352 "%s/metadata", ua_sess
->path
);
1354 PERROR("asprintf UST create stream");
1358 DBG2("UST metadata stream object created for app pid %d",
1361 ERR("Attempting to create stream without metadata opened");
1372 * Return pointer to traceable apps list.
1374 struct lttng_ht
*ust_app_get_ht(void)
1380 * Return ust app pointer or NULL if not found.
1382 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1384 struct lttng_ht_node_ulong
*node
;
1385 struct lttng_ht_iter iter
;
1388 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1389 node
= lttng_ht_iter_get_node_ulong(&iter
);
1391 DBG2("UST app no found with pid %d", pid
);
1396 DBG2("Found UST app by pid %d", pid
);
1398 return caa_container_of(node
, struct ust_app
, pid_n
);
1406 * Using pid and uid (of the app), allocate a new ust_app struct and
1407 * add it to the global traceable app list.
1409 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1410 * bitness is not supported.
1412 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1414 struct ust_app
*lta
;
1417 if ((msg
->bits_per_long
== 64 &&
1418 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
1419 || (msg
->bits_per_long
== 32 &&
1420 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
1421 ERR("Registration failed: application \"%s\" (pid: %d) has "
1422 "%d-bit long, but no consumerd for this long size is available.\n",
1423 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1428 lttng_fd_put(LTTNG_FD_APPS
, 1);
1431 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1432 ERR("Registration failed: application \"%s\" (pid: %d) has "
1433 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1434 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1439 lttng_fd_put(LTTNG_FD_APPS
, 1);
1442 lta
= zmalloc(sizeof(struct ust_app
));
1448 lta
->ppid
= msg
->ppid
;
1449 lta
->uid
= msg
->uid
;
1450 lta
->gid
= msg
->gid
;
1451 lta
->compatible
= 0; /* Not compatible until proven */
1452 lta
->bits_per_long
= msg
->bits_per_long
;
1453 lta
->v_major
= msg
->major
;
1454 lta
->v_minor
= msg
->minor
;
1455 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1456 lta
->name
[16] = '\0';
1457 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1459 lta
->pid
= msg
->pid
;
1460 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1462 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1464 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
1469 * On a re-registration, we want to kick out the previous registration of
1472 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1475 * The socket _should_ be unique until _we_ call close. So, a add_unique
1476 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1477 * already in the table.
1479 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1483 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1484 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1485 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1491 * Unregister app by removing it from the global traceable app list and freeing
1494 * The socket is already closed at this point so no close to sock.
1496 void ust_app_unregister(int sock
)
1498 struct ust_app
*lta
;
1499 struct lttng_ht_node_ulong
*node
;
1500 struct lttng_ht_iter iter
;
1501 struct ust_app_session
*ua_sess
;
1506 /* Get the node reference for a call_rcu */
1507 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1508 node
= lttng_ht_iter_get_node_ulong(&iter
);
1510 ERR("Unable to find app by sock %d", sock
);
1514 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1516 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1518 /* Remove application from PID hash table */
1519 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1522 /* Assign second node for deletion */
1523 iter
.iter
.node
= <a
->pid_n
.node
;
1526 * Ignore return value since the node might have been removed before by an
1527 * add replace during app registration because the PID can be reassigned by
1530 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1532 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1536 /* Remove sessions so they are not visible during deletion.*/
1537 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
1539 ret
= lttng_ht_del(lta
->sessions
, &iter
);
1541 /* The session was already removed so scheduled for teardown. */
1546 * Add session to list for teardown. This is safe since at this point we
1547 * are the only one using this list.
1549 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
1553 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1561 * Return traceable_app_count
1563 unsigned long ust_app_list_count(void)
1565 unsigned long count
;
1568 count
= lttng_ht_get_count(ust_app_ht
);
1575 * Fill events array with all events name of all registered apps.
1577 int ust_app_list_events(struct lttng_event
**events
)
1580 size_t nbmem
, count
= 0;
1581 struct lttng_ht_iter iter
;
1582 struct ust_app
*app
;
1583 struct lttng_event
*tmp
;
1585 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1586 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1588 PERROR("zmalloc ust app events");
1595 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1596 struct lttng_ust_tracepoint_iter uiter
;
1598 health_code_update(&health_thread_cmd
);
1600 if (!app
->compatible
) {
1602 * TODO: In time, we should notice the caller of this error by
1603 * telling him that this is a version error.
1607 handle
= ustctl_tracepoint_list(app
->sock
);
1609 ERR("UST app list events getting handle failed for app pid %d",
1614 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
1615 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1616 health_code_update(&health_thread_cmd
);
1617 if (count
>= nbmem
) {
1618 /* In case the realloc fails, we free the memory */
1619 void *tmp_ptr
= (void *) tmp
;
1620 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1623 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event
));
1625 PERROR("realloc ust app events");
1631 memcpy(tmp
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1632 tmp
[count
].loglevel
= uiter
.loglevel
;
1633 tmp
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
1634 tmp
[count
].pid
= app
->pid
;
1635 tmp
[count
].enabled
= -1;
1643 DBG2("UST app list events done (%zu events)", count
);
1648 health_code_update(&health_thread_cmd
);
1653 * Fill events array with all events name of all registered apps.
1655 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
1658 size_t nbmem
, count
= 0;
1659 struct lttng_ht_iter iter
;
1660 struct ust_app
*app
;
1661 struct lttng_event_field
*tmp
;
1663 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1664 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
1666 PERROR("zmalloc ust app event fields");
1673 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1674 struct lttng_ust_field_iter uiter
;
1676 health_code_update(&health_thread_cmd
);
1678 if (!app
->compatible
) {
1680 * TODO: In time, we should notice the caller of this error by
1681 * telling him that this is a version error.
1685 handle
= ustctl_tracepoint_field_list(app
->sock
);
1687 ERR("UST app list event fields getting handle failed for app pid %d",
1692 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
1693 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1694 health_code_update(&health_thread_cmd
);
1695 if (count
>= nbmem
) {
1696 /* In case the realloc fails, we free the memory */
1697 void *tmp_ptr
= (void *) tmp
;
1698 DBG2("Reallocating event field list from %zu to %zu entries", nbmem
,
1701 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event_field
));
1703 PERROR("realloc ust app event fields");
1710 memcpy(tmp
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
1711 tmp
[count
].type
= uiter
.type
;
1712 tmp
[count
].nowrite
= uiter
.nowrite
;
1714 memcpy(tmp
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1715 tmp
[count
].event
.loglevel
= uiter
.loglevel
;
1716 tmp
[count
].event
.type
= LTTNG_UST_TRACEPOINT
;
1717 tmp
[count
].event
.pid
= app
->pid
;
1718 tmp
[count
].event
.enabled
= -1;
1726 DBG2("UST app list event fields done (%zu events)", count
);
1731 health_code_update(&health_thread_cmd
);
1736 * Free and clean all traceable apps of the global list.
1738 void ust_app_clean_list(void)
1741 struct ust_app
*app
;
1742 struct lttng_ht_iter iter
;
1744 DBG2("UST app cleaning registered apps hash table");
1748 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1749 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1751 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
1754 /* Cleanup socket hash table */
1755 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
1757 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1761 /* Destroy is done only when the ht is empty */
1762 lttng_ht_destroy(ust_app_ht
);
1763 lttng_ht_destroy(ust_app_ht_by_sock
);
1769 * Init UST app hash table.
1771 void ust_app_ht_alloc(void)
1773 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1774 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1778 * For a specific UST session, disable the channel for all registered apps.
1780 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1781 struct ltt_ust_channel
*uchan
)
1784 struct lttng_ht_iter iter
;
1785 struct lttng_ht_node_str
*ua_chan_node
;
1786 struct ust_app
*app
;
1787 struct ust_app_session
*ua_sess
;
1788 struct ust_app_channel
*ua_chan
;
1790 if (usess
== NULL
|| uchan
== NULL
) {
1791 ERR("Disabling UST global channel with NULL values");
1796 DBG2("UST app disabling channel %s from global domain for session id %d",
1797 uchan
->name
, usess
->id
);
1801 /* For every registered applications */
1802 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1803 struct lttng_ht_iter uiter
;
1804 if (!app
->compatible
) {
1806 * TODO: In time, we should notice the caller of this error by
1807 * telling him that this is a version error.
1811 ua_sess
= lookup_session_by_app(usess
, app
);
1812 if (ua_sess
== NULL
) {
1817 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1818 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1819 /* If the session if found for the app, the channel must be there */
1820 assert(ua_chan_node
);
1822 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1823 /* The channel must not be already disabled */
1824 assert(ua_chan
->enabled
== 1);
1826 /* Disable channel onto application */
1827 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1829 /* XXX: We might want to report this error at some point... */
1841 * For a specific UST session, enable the channel for all registered apps.
1843 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1844 struct ltt_ust_channel
*uchan
)
1847 struct lttng_ht_iter iter
;
1848 struct ust_app
*app
;
1849 struct ust_app_session
*ua_sess
;
1851 if (usess
== NULL
|| uchan
== NULL
) {
1852 ERR("Adding UST global channel to NULL values");
1857 DBG2("UST app enabling channel %s to global domain for session id %d",
1858 uchan
->name
, usess
->id
);
1862 /* For every registered applications */
1863 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1864 if (!app
->compatible
) {
1866 * TODO: In time, we should notice the caller of this error by
1867 * telling him that this is a version error.
1871 ua_sess
= lookup_session_by_app(usess
, app
);
1872 if (ua_sess
== NULL
) {
1876 /* Enable channel onto application */
1877 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1879 /* XXX: We might want to report this error at some point... */
1891 * Disable an event in a channel and for a specific session.
1893 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1894 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1897 struct lttng_ht_iter iter
, uiter
;
1898 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1899 struct ust_app
*app
;
1900 struct ust_app_session
*ua_sess
;
1901 struct ust_app_channel
*ua_chan
;
1902 struct ust_app_event
*ua_event
;
1904 DBG("UST app disabling event %s for all apps in channel "
1905 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1909 /* For all registered applications */
1910 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1911 if (!app
->compatible
) {
1913 * TODO: In time, we should notice the caller of this error by
1914 * telling him that this is a version error.
1918 ua_sess
= lookup_session_by_app(usess
, app
);
1919 if (ua_sess
== NULL
) {
1924 /* Lookup channel in the ust app session */
1925 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1926 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1927 if (ua_chan_node
== NULL
) {
1928 DBG2("Channel %s not found in session id %d for app pid %d."
1929 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
1932 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1934 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
1935 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1936 if (ua_event_node
== NULL
) {
1937 DBG2("Event %s not found in channel %s for app pid %d."
1938 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
1941 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1943 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1945 /* XXX: Report error someday... */
1956 * For a specific UST session and UST channel, the event for all
1959 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
1960 struct ltt_ust_channel
*uchan
)
1963 struct lttng_ht_iter iter
, uiter
;
1964 struct lttng_ht_node_str
*ua_chan_node
;
1965 struct ust_app
*app
;
1966 struct ust_app_session
*ua_sess
;
1967 struct ust_app_channel
*ua_chan
;
1968 struct ust_app_event
*ua_event
;
1970 DBG("UST app disabling all event for all apps in channel "
1971 "%s for session id %d", uchan
->name
, usess
->id
);
1975 /* For all registered applications */
1976 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1977 if (!app
->compatible
) {
1979 * TODO: In time, we should notice the caller of this error by
1980 * telling him that this is a version error.
1984 ua_sess
= lookup_session_by_app(usess
, app
);
1986 /* The application has problem or is probably dead. */
1990 /* Lookup channel in the ust app session */
1991 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1992 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1993 /* If the channel is not found, there is a code flow error */
1994 assert(ua_chan_node
);
1996 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1998 /* Disable each events of channel */
1999 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2001 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2003 /* XXX: Report error someday... */
2015 * For a specific UST session, create the channel for all registered apps.
2017 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
2018 struct ltt_ust_channel
*uchan
)
2021 struct lttng_ht_iter iter
;
2022 struct ust_app
*app
;
2023 struct ust_app_session
*ua_sess
;
2024 struct ust_app_channel
*ua_chan
;
2026 /* Very wrong code flow */
2030 DBG2("UST app adding channel %s to global domain for session id %d",
2031 uchan
->name
, usess
->id
);
2035 /* For every registered applications */
2036 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2037 if (!app
->compatible
) {
2039 * TODO: In time, we should notice the caller of this error by
2040 * telling him that this is a version error.
2045 * Create session on the tracer side and add it to app session HT. Note
2046 * that if session exist, it will simply return a pointer to the ust
2049 ua_sess
= create_ust_app_session(usess
, app
);
2050 if (ua_sess
== NULL
) {
2051 /* The malloc() failed. */
2053 goto error_rcu_unlock
;
2054 } else if (ua_sess
== (void *) -1UL) {
2055 /* The application's socket is not valid. Contiuing */
2060 /* Create channel onto application */
2061 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
2062 if (ua_chan
== NULL
) {
2063 /* Major problem here and it's maybe the tracer or malloc() */
2065 goto error_rcu_unlock
;
2075 * Enable event for a specific session and channel on the tracer.
2077 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
2078 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2081 struct lttng_ht_iter iter
, uiter
;
2082 struct lttng_ht_node_str
*ua_chan_node
;
2083 struct ust_app
*app
;
2084 struct ust_app_session
*ua_sess
;
2085 struct ust_app_channel
*ua_chan
;
2086 struct ust_app_event
*ua_event
;
2088 DBG("UST app enabling event %s for all apps for session id %d",
2089 uevent
->attr
.name
, usess
->id
);
2092 * NOTE: At this point, this function is called only if the session and
2093 * channel passed are already created for all apps. and enabled on the
2099 /* For all registered applications */
2100 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2101 if (!app
->compatible
) {
2103 * TODO: In time, we should notice the caller of this error by
2104 * telling him that this is a version error.
2108 ua_sess
= lookup_session_by_app(usess
, app
);
2110 /* The application has problem or is probably dead. */
2114 /* Lookup channel in the ust app session */
2115 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2116 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2117 /* If the channel is not found, there is a code flow error */
2118 assert(ua_chan_node
);
2120 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2122 /* Get event node */
2123 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2124 uevent
->filter
, uevent
->attr
.loglevel
);
2125 if (ua_event
== NULL
) {
2126 DBG3("UST app enable event %s not found for app PID %d."
2127 "Skipping app", uevent
->attr
.name
, app
->pid
);
2131 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2143 * For a specific existing UST session and UST channel, creates the event for
2144 * all registered apps.
2146 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
2147 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2150 struct lttng_ht_iter iter
, uiter
;
2151 struct lttng_ht_node_str
*ua_chan_node
;
2152 struct ust_app
*app
;
2153 struct ust_app_session
*ua_sess
;
2154 struct ust_app_channel
*ua_chan
;
2156 DBG("UST app creating event %s for all apps for session id %d",
2157 uevent
->attr
.name
, usess
->id
);
2161 /* For all registered applications */
2162 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2163 if (!app
->compatible
) {
2165 * TODO: In time, we should notice the caller of this error by
2166 * telling him that this is a version error.
2170 ua_sess
= lookup_session_by_app(usess
, app
);
2172 /* The application has problem or is probably dead. */
2176 /* Lookup channel in the ust app session */
2177 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2178 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2179 /* If the channel is not found, there is a code flow error */
2180 assert(ua_chan_node
);
2182 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2184 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2186 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
2187 /* Possible value at this point: -ENOMEM. If so, we stop! */
2190 DBG2("UST app event %s already exist on app PID %d",
2191 uevent
->attr
.name
, app
->pid
);
2202 * Start tracing for a specific UST session and app.
2204 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2207 struct lttng_ht_iter iter
;
2208 struct ust_app_session
*ua_sess
;
2209 struct ust_app_channel
*ua_chan
;
2210 struct ltt_ust_stream
*ustream
;
2211 struct consumer_socket
*socket
;
2213 DBG("Starting tracing for ust app pid %d", app
->pid
);
2217 if (!app
->compatible
) {
2221 ua_sess
= lookup_session_by_app(usess
, app
);
2222 if (ua_sess
== NULL
) {
2223 /* The session is in teardown process. Ignore and continue. */
2227 /* Upon restart, we skip the setup, already done */
2228 if (ua_sess
->started
) {
2232 /* Create directories if consumer is LOCAL and has a path defined. */
2233 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2234 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
2235 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
2236 S_IRWXU
| S_IRWXG
, usess
->uid
, usess
->gid
);
2238 if (ret
!= -EEXIST
) {
2239 ERR("Trace directory creation error");
2241 goto error_rcu_unlock
;
2246 /* Indicate that the session has been started once */
2247 ua_sess
->started
= 1;
2249 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
2251 ret
= LTTNG_ERR_UST_META_FAIL
;
2252 goto error_rcu_unlock
;
2255 /* For each channel */
2256 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2258 /* Create all streams */
2260 /* Create UST stream */
2261 ustream
= zmalloc(sizeof(*ustream
));
2262 if (ustream
== NULL
) {
2263 PERROR("zmalloc ust stream");
2264 goto error_rcu_unlock
;
2267 /* We are going to receive 2 fds, we need to reserve them. */
2268 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2270 ERR("Exhausted number of available FD upon stream create");
2272 goto error_rcu_unlock
;
2275 health_code_update(&health_thread_cmd
);
2277 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
,
2280 /* Got all streams */
2281 lttng_fd_put(LTTNG_FD_APPS
, 2);
2283 ret
= LTTNG_ERR_UST_STREAM_FAIL
;
2286 ustream
->handle
= ustream
->obj
->handle
;
2288 health_code_update(&health_thread_cmd
);
2290 /* Order is important */
2291 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2292 ret
= snprintf(ustream
->name
, sizeof(ustream
->name
), "%s_%u",
2293 ua_chan
->name
, ua_chan
->streams
.count
);
2294 ua_chan
->streams
.count
++;
2296 PERROR("asprintf UST create stream");
2298 * XXX what should we do here with the
2303 DBG2("UST stream %d ready (handle: %d)", ua_chan
->streams
.count
,
2307 health_code_update(&health_thread_cmd
);
2310 switch (app
->bits_per_long
) {
2312 socket
= consumer_find_socket(uatomic_read(&ust_consumerd64_fd
),
2314 if (socket
== NULL
) {
2319 socket
= consumer_find_socket(uatomic_read(&ust_consumerd32_fd
),
2321 if (socket
== NULL
) {
2327 goto error_rcu_unlock
;
2330 /* Setup UST consumer socket and send fds to it */
2331 ret
= ust_consumer_send_session(ua_sess
, usess
->consumer
, socket
);
2333 goto error_rcu_unlock
;
2336 health_code_update(&health_thread_cmd
);
2339 /* This start the UST tracing */
2340 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2342 ERR("Error starting tracing for app pid: %d", app
->pid
);
2343 goto error_rcu_unlock
;
2346 health_code_update(&health_thread_cmd
);
2348 /* Quiescent wait after starting trace */
2349 ustctl_wait_quiescent(app
->sock
);
2353 health_code_update(&health_thread_cmd
);
2358 health_code_update(&health_thread_cmd
);
2363 * Stop tracing for a specific UST session and app.
2365 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2368 struct lttng_ht_iter iter
;
2369 struct ust_app_session
*ua_sess
;
2370 struct ust_app_channel
*ua_chan
;
2372 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2376 if (!app
->compatible
) {
2380 ua_sess
= lookup_session_by_app(usess
, app
);
2381 if (ua_sess
== NULL
) {
2386 * If started = 0, it means that stop trace has been called for a session
2387 * that was never started. This is a code flow error and should never
2390 assert(ua_sess
->started
== 1);
2392 health_code_update(&health_thread_cmd
);
2394 /* This inhibits UST tracing */
2395 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2397 ERR("Error stopping tracing for app pid: %d", app
->pid
);
2398 goto error_rcu_unlock
;
2401 health_code_update(&health_thread_cmd
);
2403 /* Quiescent wait after stopping trace */
2404 ustctl_wait_quiescent(app
->sock
);
2406 health_code_update(&health_thread_cmd
);
2408 /* Flushing buffers */
2409 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2411 health_code_update(&health_thread_cmd
);
2412 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2414 ERR("UST app PID %d channel %s flush failed with ret %d",
2415 app
->pid
, ua_chan
->name
, ret
);
2416 /* Continuing flushing all buffers */
2421 health_code_update(&health_thread_cmd
);
2423 /* Flush all buffers before stopping */
2424 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2426 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2432 health_code_update(&health_thread_cmd
);
2437 health_code_update(&health_thread_cmd
);
2442 * Destroy a specific UST session in apps.
2444 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2446 struct ust_app_session
*ua_sess
;
2447 struct lttng_ust_object_data obj
;
2448 struct lttng_ht_iter iter
;
2449 struct lttng_ht_node_ulong
*node
;
2452 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2456 if (!app
->compatible
) {
2460 __lookup_session_by_app(usess
, app
, &iter
);
2461 node
= lttng_ht_iter_get_node_ulong(&iter
);
2463 /* Session is being or is deleted. */
2466 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2467 ret
= lttng_ht_del(app
->sessions
, &iter
);
2469 /* Already scheduled for teardown. */
2473 obj
.handle
= ua_sess
->handle
;
2476 obj
.memory_map_size
= 0;
2477 health_code_update(&health_thread_cmd
);
2478 ustctl_release_object(app
->sock
, &obj
);
2480 health_code_update(&health_thread_cmd
);
2481 delete_ust_app_session(app
->sock
, ua_sess
);
2483 /* Quiescent wait after stopping trace */
2484 ustctl_wait_quiescent(app
->sock
);
2488 health_code_update(&health_thread_cmd
);
2493 * Start tracing for the UST session.
2495 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2498 struct lttng_ht_iter iter
;
2499 struct ust_app
*app
;
2501 DBG("Starting all UST traces");
2505 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2506 ret
= ust_app_start_trace(usess
, app
);
2508 /* Continue to next apps even on error */
2519 * Start tracing for the UST session.
2521 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2524 struct lttng_ht_iter iter
;
2525 struct ust_app
*app
;
2527 DBG("Stopping all UST traces");
2531 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2532 ret
= ust_app_stop_trace(usess
, app
);
2534 /* Continue to next apps even on error */
2545 * Destroy app UST session.
2547 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2550 struct lttng_ht_iter iter
;
2551 struct ust_app
*app
;
2553 DBG("Destroy all UST traces");
2557 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2558 ret
= destroy_trace(usess
, app
);
2560 /* Continue to next apps even on error */
2571 * Add channels/events from UST global domain to registered apps at sock.
2573 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2576 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2577 struct ust_app
*app
;
2578 struct ust_app_session
*ua_sess
;
2579 struct ust_app_channel
*ua_chan
;
2580 struct ust_app_event
*ua_event
;
2581 struct ust_app_ctx
*ua_ctx
;
2585 DBG2("UST app global update for app sock %d for session id %d", sock
,
2590 app
= find_app_by_sock(sock
);
2592 ERR("Failed to update app sock %d", sock
);
2596 if (!app
->compatible
) {
2600 ua_sess
= create_ust_app_session(usess
, app
);
2601 if (ua_sess
== NULL
|| ua_sess
== (void *) -1UL) {
2602 /* Tracer is gone for this session and has been freed */
2607 * We can iterate safely here over all UST app session sicne the create ust
2608 * app session above made a shadow copy of the UST global domain from the
2611 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2613 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2615 /* FIXME: Should we quit here or continue... */
2619 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2621 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2623 /* FIXME: Should we quit here or continue... */
2629 /* For each events */
2630 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2632 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2634 /* FIXME: Should we quit here or continue... */
2638 ret
= set_ust_event_filter(ua_event
, app
);
2640 /* FIXME: Should we quit here or continue... */
2646 if (usess
->start_trace
) {
2647 ret
= ust_app_start_trace(usess
, app
);
2652 DBG2("UST trace started for app pid %d", app
->pid
);
2661 * Add context to a specific channel for global UST domain.
2663 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2664 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2667 struct lttng_ht_node_str
*ua_chan_node
;
2668 struct lttng_ht_iter iter
, uiter
;
2669 struct ust_app_channel
*ua_chan
= NULL
;
2670 struct ust_app_session
*ua_sess
;
2671 struct ust_app
*app
;
2675 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2676 if (!app
->compatible
) {
2678 * TODO: In time, we should notice the caller of this error by
2679 * telling him that this is a version error.
2683 ua_sess
= lookup_session_by_app(usess
, app
);
2684 if (ua_sess
== NULL
) {
2688 /* Lookup channel in the ust app session */
2689 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2690 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2691 if (ua_chan_node
== NULL
) {
2694 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2697 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2708 * Enable event for a channel from a UST session for a specific PID.
2710 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2711 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2714 struct lttng_ht_iter iter
;
2715 struct lttng_ht_node_str
*ua_chan_node
;
2716 struct ust_app
*app
;
2717 struct ust_app_session
*ua_sess
;
2718 struct ust_app_channel
*ua_chan
;
2719 struct ust_app_event
*ua_event
;
2721 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2725 app
= ust_app_find_by_pid(pid
);
2727 ERR("UST app enable event per PID %d not found", pid
);
2732 if (!app
->compatible
) {
2737 ua_sess
= lookup_session_by_app(usess
, app
);
2739 /* The application has problem or is probably dead. */
2743 /* Lookup channel in the ust app session */
2744 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2745 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2746 /* If the channel is not found, there is a code flow error */
2747 assert(ua_chan_node
);
2749 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2751 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2752 uevent
->filter
, uevent
->attr
.loglevel
);
2753 if (ua_event
== NULL
) {
2754 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2759 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2771 * Disable event for a channel from a UST session for a specific PID.
2773 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2774 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2777 struct lttng_ht_iter iter
;
2778 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2779 struct ust_app
*app
;
2780 struct ust_app_session
*ua_sess
;
2781 struct ust_app_channel
*ua_chan
;
2782 struct ust_app_event
*ua_event
;
2784 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2788 app
= ust_app_find_by_pid(pid
);
2790 ERR("UST app disable event per PID %d not found", pid
);
2795 if (!app
->compatible
) {
2800 ua_sess
= lookup_session_by_app(usess
, app
);
2802 /* The application has problem or is probably dead. */
2806 /* Lookup channel in the ust app session */
2807 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2808 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2809 if (ua_chan_node
== NULL
) {
2810 /* Channel does not exist, skip disabling */
2813 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2815 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2816 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2817 if (ua_event_node
== NULL
) {
2818 /* Event does not exist, skip disabling */
2821 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2823 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2834 * Validate version of UST apps and set the compatible bit.
2836 int ust_app_validate_version(int sock
)
2839 struct ust_app
*app
;
2843 app
= find_app_by_sock(sock
);
2846 health_code_update(&health_thread_cmd
);
2848 ret
= ustctl_tracer_version(sock
, &app
->version
);
2853 /* Validate version */
2854 if (app
->version
.major
!= UST_APP_MAJOR_VERSION
) {
2858 DBG2("UST app PID %d is compatible with internal major version %d "
2859 "(supporting == %d)", app
->pid
, app
->version
.major
,
2860 UST_APP_MAJOR_VERSION
);
2861 app
->compatible
= 1;
2863 health_code_update(&health_thread_cmd
);
2867 DBG2("UST app PID %d is not compatible with internal major version %d "
2868 "(supporting == %d)", app
->pid
, app
->version
.major
,
2869 UST_APP_MAJOR_VERSION
);
2870 app
->compatible
= 0;
2872 health_code_update(&health_thread_cmd
);
2877 * Calibrate registered applications.
2879 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2882 struct lttng_ht_iter iter
;
2883 struct ust_app
*app
;
2887 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2888 if (!app
->compatible
) {
2890 * TODO: In time, we should notice the caller of this error by
2891 * telling him that this is a version error.
2896 health_code_update(&health_thread_cmd
);
2898 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2902 /* Means that it's not implemented on the tracer side. */
2906 /* TODO: Report error to user */
2907 DBG2("Calibrate app PID %d returned with error %d",
2914 DBG("UST app global domain calibration finished");
2918 health_code_update(&health_thread_cmd
);