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. Set ua_chanp of the
1216 * newly created channel if not NULL.
1218 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
1219 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
1220 struct ust_app_channel
**ua_chanp
)
1223 struct lttng_ht_iter iter
;
1224 struct lttng_ht_node_str
*ua_chan_node
;
1225 struct ust_app_channel
*ua_chan
;
1227 /* Lookup channel in the ust app session */
1228 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1229 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1230 if (ua_chan_node
!= NULL
) {
1231 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1235 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1236 if (ua_chan
== NULL
) {
1237 /* Only malloc can fail here */
1241 shadow_copy_channel(ua_chan
, uchan
);
1243 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1245 /* Not found previously means that it does not exist on the tracer */
1246 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1250 /* Only add the channel if successful on the tracer side. */
1251 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1253 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1258 *ua_chanp
= ua_chan
;
1261 /* Everything went well. */
1265 delete_ust_app_channel(-1, ua_chan
);
1270 * Create UST app event and create it on the tracer side.
1273 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1274 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1275 struct ust_app
*app
)
1278 struct ust_app_event
*ua_event
;
1280 /* Get event node */
1281 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1282 uevent
->filter
, uevent
->attr
.loglevel
);
1283 if (ua_event
!= NULL
) {
1288 /* Does not exist so create one */
1289 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1290 if (ua_event
== NULL
) {
1291 /* Only malloc can failed so something is really wrong */
1295 shadow_copy_event(ua_event
, uevent
);
1297 /* Create it on the tracer side */
1298 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1300 /* Not found previously means that it does not exist on the tracer */
1301 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1305 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
1307 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1314 /* Valid. Calling here is already in a read side lock */
1315 delete_ust_app_event(-1, ua_event
);
1320 * Create UST metadata and open it on the tracer side.
1322 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1323 char *pathname
, struct ust_app
*app
)
1327 if (ua_sess
->metadata
== NULL
) {
1328 /* Allocate UST metadata */
1329 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1330 if (ua_sess
->metadata
== NULL
) {
1331 /* malloc() failed */
1335 ret
= open_ust_metadata(app
, ua_sess
);
1337 DBG3("Opening metadata failed. Cleaning up memory");
1339 /* Cleanup failed metadata struct */
1340 free(ua_sess
->metadata
);
1342 * This is very important because delete_ust_app_session check if
1343 * the pointer is null or not in order to delete the metadata.
1345 ua_sess
->metadata
= NULL
;
1349 DBG2("UST metadata opened for app pid %d", app
->pid
);
1352 /* Open UST metadata stream */
1353 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1354 ret
= create_ust_stream(app
, ua_sess
);
1359 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1360 "%s/metadata", ua_sess
->path
);
1362 PERROR("asprintf UST create stream");
1366 DBG2("UST metadata stream object created for app pid %d",
1369 ERR("Attempting to create stream without metadata opened");
1380 * Return pointer to traceable apps list.
1382 struct lttng_ht
*ust_app_get_ht(void)
1388 * Return ust app pointer or NULL if not found.
1390 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1392 struct lttng_ht_node_ulong
*node
;
1393 struct lttng_ht_iter iter
;
1396 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1397 node
= lttng_ht_iter_get_node_ulong(&iter
);
1399 DBG2("UST app no found with pid %d", pid
);
1404 DBG2("Found UST app by pid %d", pid
);
1406 return caa_container_of(node
, struct ust_app
, pid_n
);
1414 * Using pid and uid (of the app), allocate a new ust_app struct and
1415 * add it to the global traceable app list.
1417 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1418 * bitness is not supported.
1420 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1422 struct ust_app
*lta
;
1425 if ((msg
->bits_per_long
== 64 &&
1426 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
1427 || (msg
->bits_per_long
== 32 &&
1428 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
1429 ERR("Registration failed: application \"%s\" (pid: %d) has "
1430 "%d-bit long, but no consumerd for this long size is available.\n",
1431 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1436 lttng_fd_put(LTTNG_FD_APPS
, 1);
1439 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1440 ERR("Registration failed: application \"%s\" (pid: %d) has "
1441 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1442 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1447 lttng_fd_put(LTTNG_FD_APPS
, 1);
1450 lta
= zmalloc(sizeof(struct ust_app
));
1456 lta
->ppid
= msg
->ppid
;
1457 lta
->uid
= msg
->uid
;
1458 lta
->gid
= msg
->gid
;
1459 lta
->compatible
= 0; /* Not compatible until proven */
1460 lta
->bits_per_long
= msg
->bits_per_long
;
1461 lta
->v_major
= msg
->major
;
1462 lta
->v_minor
= msg
->minor
;
1463 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1464 lta
->name
[16] = '\0';
1465 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1467 lta
->pid
= msg
->pid
;
1468 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1470 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1472 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
1477 * On a re-registration, we want to kick out the previous registration of
1480 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1483 * The socket _should_ be unique until _we_ call close. So, a add_unique
1484 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1485 * already in the table.
1487 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1491 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1492 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1493 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1499 * Unregister app by removing it from the global traceable app list and freeing
1502 * The socket is already closed at this point so no close to sock.
1504 void ust_app_unregister(int sock
)
1506 struct ust_app
*lta
;
1507 struct lttng_ht_node_ulong
*node
;
1508 struct lttng_ht_iter iter
;
1509 struct ust_app_session
*ua_sess
;
1514 /* Get the node reference for a call_rcu */
1515 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1516 node
= lttng_ht_iter_get_node_ulong(&iter
);
1518 ERR("Unable to find app by sock %d", sock
);
1522 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1524 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1526 /* Remove application from PID hash table */
1527 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1530 /* Assign second node for deletion */
1531 iter
.iter
.node
= <a
->pid_n
.node
;
1534 * Ignore return value since the node might have been removed before by an
1535 * add replace during app registration because the PID can be reassigned by
1538 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1540 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1544 /* Remove sessions so they are not visible during deletion.*/
1545 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
1547 ret
= lttng_ht_del(lta
->sessions
, &iter
);
1549 /* The session was already removed so scheduled for teardown. */
1554 * Add session to list for teardown. This is safe since at this point we
1555 * are the only one using this list.
1557 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
1561 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1569 * Return traceable_app_count
1571 unsigned long ust_app_list_count(void)
1573 unsigned long count
;
1576 count
= lttng_ht_get_count(ust_app_ht
);
1583 * Fill events array with all events name of all registered apps.
1585 int ust_app_list_events(struct lttng_event
**events
)
1588 size_t nbmem
, count
= 0;
1589 struct lttng_ht_iter iter
;
1590 struct ust_app
*app
;
1591 struct lttng_event
*tmp
;
1593 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1594 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1596 PERROR("zmalloc ust app events");
1603 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1604 struct lttng_ust_tracepoint_iter uiter
;
1606 health_code_update(&health_thread_cmd
);
1608 if (!app
->compatible
) {
1610 * TODO: In time, we should notice the caller of this error by
1611 * telling him that this is a version error.
1615 handle
= ustctl_tracepoint_list(app
->sock
);
1617 ERR("UST app list events getting handle failed for app pid %d",
1622 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
1623 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1624 health_code_update(&health_thread_cmd
);
1625 if (count
>= nbmem
) {
1626 /* In case the realloc fails, we free the memory */
1627 void *tmp_ptr
= (void *) tmp
;
1628 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1631 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event
));
1633 PERROR("realloc ust app events");
1639 memcpy(tmp
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1640 tmp
[count
].loglevel
= uiter
.loglevel
;
1641 tmp
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
1642 tmp
[count
].pid
= app
->pid
;
1643 tmp
[count
].enabled
= -1;
1651 DBG2("UST app list events done (%zu events)", count
);
1656 health_code_update(&health_thread_cmd
);
1661 * Fill events array with all events name of all registered apps.
1663 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
1666 size_t nbmem
, count
= 0;
1667 struct lttng_ht_iter iter
;
1668 struct ust_app
*app
;
1669 struct lttng_event_field
*tmp
;
1671 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1672 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
1674 PERROR("zmalloc ust app event fields");
1681 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1682 struct lttng_ust_field_iter uiter
;
1684 health_code_update(&health_thread_cmd
);
1686 if (!app
->compatible
) {
1688 * TODO: In time, we should notice the caller of this error by
1689 * telling him that this is a version error.
1693 handle
= ustctl_tracepoint_field_list(app
->sock
);
1695 ERR("UST app list event fields getting handle failed for app pid %d",
1700 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
1701 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1702 health_code_update(&health_thread_cmd
);
1703 if (count
>= nbmem
) {
1704 /* In case the realloc fails, we free the memory */
1705 void *tmp_ptr
= (void *) tmp
;
1706 DBG2("Reallocating event field list from %zu to %zu entries", nbmem
,
1709 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event_field
));
1711 PERROR("realloc ust app event fields");
1718 memcpy(tmp
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
1719 tmp
[count
].type
= uiter
.type
;
1720 tmp
[count
].nowrite
= uiter
.nowrite
;
1722 memcpy(tmp
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1723 tmp
[count
].event
.loglevel
= uiter
.loglevel
;
1724 tmp
[count
].event
.type
= LTTNG_UST_TRACEPOINT
;
1725 tmp
[count
].event
.pid
= app
->pid
;
1726 tmp
[count
].event
.enabled
= -1;
1734 DBG2("UST app list event fields done (%zu events)", count
);
1739 health_code_update(&health_thread_cmd
);
1744 * Free and clean all traceable apps of the global list.
1746 void ust_app_clean_list(void)
1749 struct ust_app
*app
;
1750 struct lttng_ht_iter iter
;
1752 DBG2("UST app cleaning registered apps hash table");
1756 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1757 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1759 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
1762 /* Cleanup socket hash table */
1763 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
1765 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1769 /* Destroy is done only when the ht is empty */
1770 lttng_ht_destroy(ust_app_ht
);
1771 lttng_ht_destroy(ust_app_ht_by_sock
);
1777 * Init UST app hash table.
1779 void ust_app_ht_alloc(void)
1781 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1782 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1786 * For a specific UST session, disable the channel for all registered apps.
1788 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1789 struct ltt_ust_channel
*uchan
)
1792 struct lttng_ht_iter iter
;
1793 struct lttng_ht_node_str
*ua_chan_node
;
1794 struct ust_app
*app
;
1795 struct ust_app_session
*ua_sess
;
1796 struct ust_app_channel
*ua_chan
;
1798 if (usess
== NULL
|| uchan
== NULL
) {
1799 ERR("Disabling UST global channel with NULL values");
1804 DBG2("UST app disabling channel %s from global domain for session id %d",
1805 uchan
->name
, usess
->id
);
1809 /* For every registered applications */
1810 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1811 struct lttng_ht_iter uiter
;
1812 if (!app
->compatible
) {
1814 * TODO: In time, we should notice the caller of this error by
1815 * telling him that this is a version error.
1819 ua_sess
= lookup_session_by_app(usess
, app
);
1820 if (ua_sess
== NULL
) {
1825 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1826 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1827 /* If the session if found for the app, the channel must be there */
1828 assert(ua_chan_node
);
1830 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1831 /* The channel must not be already disabled */
1832 assert(ua_chan
->enabled
== 1);
1834 /* Disable channel onto application */
1835 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1837 /* XXX: We might want to report this error at some point... */
1849 * For a specific UST session, enable the channel for all registered apps.
1851 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1852 struct ltt_ust_channel
*uchan
)
1855 struct lttng_ht_iter iter
;
1856 struct ust_app
*app
;
1857 struct ust_app_session
*ua_sess
;
1859 if (usess
== NULL
|| uchan
== NULL
) {
1860 ERR("Adding UST global channel to NULL values");
1865 DBG2("UST app enabling channel %s to global domain for session id %d",
1866 uchan
->name
, usess
->id
);
1870 /* For every registered applications */
1871 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1872 if (!app
->compatible
) {
1874 * TODO: In time, we should notice the caller of this error by
1875 * telling him that this is a version error.
1879 ua_sess
= lookup_session_by_app(usess
, app
);
1880 if (ua_sess
== NULL
) {
1884 /* Enable channel onto application */
1885 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1887 /* XXX: We might want to report this error at some point... */
1899 * Disable an event in a channel and for a specific session.
1901 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1902 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1905 struct lttng_ht_iter iter
, uiter
;
1906 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1907 struct ust_app
*app
;
1908 struct ust_app_session
*ua_sess
;
1909 struct ust_app_channel
*ua_chan
;
1910 struct ust_app_event
*ua_event
;
1912 DBG("UST app disabling event %s for all apps in channel "
1913 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1917 /* For all registered applications */
1918 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1919 if (!app
->compatible
) {
1921 * TODO: In time, we should notice the caller of this error by
1922 * telling him that this is a version error.
1926 ua_sess
= lookup_session_by_app(usess
, app
);
1927 if (ua_sess
== NULL
) {
1932 /* Lookup channel in the ust app session */
1933 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1934 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1935 if (ua_chan_node
== NULL
) {
1936 DBG2("Channel %s not found in session id %d for app pid %d."
1937 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
1940 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1942 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
1943 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1944 if (ua_event_node
== NULL
) {
1945 DBG2("Event %s not found in channel %s for app pid %d."
1946 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
1949 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1951 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1953 /* XXX: Report error someday... */
1964 * For a specific UST session and UST channel, the event for all
1967 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
1968 struct ltt_ust_channel
*uchan
)
1971 struct lttng_ht_iter iter
, uiter
;
1972 struct lttng_ht_node_str
*ua_chan_node
;
1973 struct ust_app
*app
;
1974 struct ust_app_session
*ua_sess
;
1975 struct ust_app_channel
*ua_chan
;
1976 struct ust_app_event
*ua_event
;
1978 DBG("UST app disabling all event for all apps in channel "
1979 "%s for session id %d", uchan
->name
, usess
->id
);
1983 /* For all registered applications */
1984 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1985 if (!app
->compatible
) {
1987 * TODO: In time, we should notice the caller of this error by
1988 * telling him that this is a version error.
1992 ua_sess
= lookup_session_by_app(usess
, app
);
1994 /* The application has problem or is probably dead. */
1998 /* Lookup channel in the ust app session */
1999 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2000 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2001 /* If the channel is not found, there is a code flow error */
2002 assert(ua_chan_node
);
2004 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2006 /* Disable each events of channel */
2007 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2009 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2011 /* XXX: Report error someday... */
2023 * For a specific UST session, create the channel for all registered apps.
2025 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
2026 struct ltt_ust_channel
*uchan
)
2029 struct lttng_ht_iter iter
;
2030 struct ust_app
*app
;
2031 struct ust_app_session
*ua_sess
;
2033 /* Very wrong code flow */
2037 DBG2("UST app adding channel %s to global domain for session id %d",
2038 uchan
->name
, usess
->id
);
2042 /* For every registered applications */
2043 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2044 if (!app
->compatible
) {
2046 * TODO: In time, we should notice the caller of this error by
2047 * telling him that this is a version error.
2052 * Create session on the tracer side and add it to app session HT. Note
2053 * that if session exist, it will simply return a pointer to the ust
2056 ua_sess
= create_ust_app_session(usess
, app
);
2057 if (ua_sess
== NULL
) {
2058 /* The malloc() failed. */
2060 goto error_rcu_unlock
;
2061 } else if (ua_sess
== (void *) -1UL) {
2063 * The application's socket is not valid. Either a bad socket or a
2064 * timeout on it. We can't inform yet the caller that for a
2065 * specific app, the session failed so we continue here.
2070 /* Create channel onto application. We don't need the chan ref. */
2071 ret
= create_ust_app_channel(ua_sess
, uchan
, app
, NULL
);
2072 if (ret
< 0 && ret
== -ENOMEM
) {
2073 /* No more memory is a fatal error. Stop right now. */
2074 goto error_rcu_unlock
;
2084 * Enable event for a specific session and channel on the tracer.
2086 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
2087 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2090 struct lttng_ht_iter iter
, uiter
;
2091 struct lttng_ht_node_str
*ua_chan_node
;
2092 struct ust_app
*app
;
2093 struct ust_app_session
*ua_sess
;
2094 struct ust_app_channel
*ua_chan
;
2095 struct ust_app_event
*ua_event
;
2097 DBG("UST app enabling event %s for all apps for session id %d",
2098 uevent
->attr
.name
, usess
->id
);
2101 * NOTE: At this point, this function is called only if the session and
2102 * channel passed are already created for all apps. and enabled on the
2108 /* For all registered applications */
2109 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2110 if (!app
->compatible
) {
2112 * TODO: In time, we should notice the caller of this error by
2113 * telling him that this is a version error.
2117 ua_sess
= lookup_session_by_app(usess
, app
);
2119 /* The application has problem or is probably dead. */
2123 /* Lookup channel in the ust app session */
2124 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2125 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2126 /* If the channel is not found, there is a code flow error */
2127 assert(ua_chan_node
);
2129 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2131 /* Get event node */
2132 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2133 uevent
->filter
, uevent
->attr
.loglevel
);
2134 if (ua_event
== NULL
) {
2135 DBG3("UST app enable event %s not found for app PID %d."
2136 "Skipping app", uevent
->attr
.name
, app
->pid
);
2140 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2152 * For a specific existing UST session and UST channel, creates the event for
2153 * all registered apps.
2155 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
2156 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2159 struct lttng_ht_iter iter
, uiter
;
2160 struct lttng_ht_node_str
*ua_chan_node
;
2161 struct ust_app
*app
;
2162 struct ust_app_session
*ua_sess
;
2163 struct ust_app_channel
*ua_chan
;
2165 DBG("UST app creating event %s for all apps for session id %d",
2166 uevent
->attr
.name
, usess
->id
);
2170 /* For all registered applications */
2171 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2172 if (!app
->compatible
) {
2174 * TODO: In time, we should notice the caller of this error by
2175 * telling him that this is a version error.
2179 ua_sess
= lookup_session_by_app(usess
, app
);
2181 /* The application has problem or is probably dead. */
2185 /* Lookup channel in the ust app session */
2186 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2187 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2188 /* If the channel is not found, there is a code flow error */
2189 assert(ua_chan_node
);
2191 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2193 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2195 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
2196 /* Possible value at this point: -ENOMEM. If so, we stop! */
2199 DBG2("UST app event %s already exist on app PID %d",
2200 uevent
->attr
.name
, app
->pid
);
2211 * Start tracing for a specific UST session and app.
2213 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2216 struct lttng_ht_iter iter
;
2217 struct ust_app_session
*ua_sess
;
2218 struct ust_app_channel
*ua_chan
;
2219 struct ltt_ust_stream
*ustream
;
2220 struct consumer_socket
*socket
;
2222 DBG("Starting tracing for ust app pid %d", app
->pid
);
2226 if (!app
->compatible
) {
2230 ua_sess
= lookup_session_by_app(usess
, app
);
2231 if (ua_sess
== NULL
) {
2232 /* The session is in teardown process. Ignore and continue. */
2236 /* Upon restart, we skip the setup, already done */
2237 if (ua_sess
->started
) {
2241 /* Create directories if consumer is LOCAL and has a path defined. */
2242 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2243 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
2244 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
2245 S_IRWXU
| S_IRWXG
, usess
->uid
, usess
->gid
);
2247 if (ret
!= -EEXIST
) {
2248 ERR("Trace directory creation error");
2250 goto error_rcu_unlock
;
2255 /* Indicate that the session has been started once */
2256 ua_sess
->started
= 1;
2258 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
2260 ret
= LTTNG_ERR_UST_META_FAIL
;
2261 goto error_rcu_unlock
;
2264 /* For each channel */
2265 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2267 /* Create all streams */
2269 /* Create UST stream */
2270 ustream
= zmalloc(sizeof(*ustream
));
2271 if (ustream
== NULL
) {
2272 PERROR("zmalloc ust stream");
2273 goto error_rcu_unlock
;
2276 /* We are going to receive 2 fds, we need to reserve them. */
2277 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2279 ERR("Exhausted number of available FD upon stream create");
2281 goto error_rcu_unlock
;
2284 health_code_update(&health_thread_cmd
);
2286 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
,
2289 /* Got all streams */
2290 lttng_fd_put(LTTNG_FD_APPS
, 2);
2292 ret
= LTTNG_ERR_UST_STREAM_FAIL
;
2295 ustream
->handle
= ustream
->obj
->handle
;
2297 health_code_update(&health_thread_cmd
);
2299 /* Order is important */
2300 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2301 ret
= snprintf(ustream
->name
, sizeof(ustream
->name
), "%s_%u",
2302 ua_chan
->name
, ua_chan
->streams
.count
);
2303 ua_chan
->streams
.count
++;
2305 PERROR("asprintf UST create stream");
2307 * XXX what should we do here with the
2312 DBG2("UST stream %d ready (handle: %d)", ua_chan
->streams
.count
,
2316 health_code_update(&health_thread_cmd
);
2319 switch (app
->bits_per_long
) {
2321 socket
= consumer_find_socket(uatomic_read(&ust_consumerd64_fd
),
2323 if (socket
== NULL
) {
2328 socket
= consumer_find_socket(uatomic_read(&ust_consumerd32_fd
),
2330 if (socket
== NULL
) {
2336 goto error_rcu_unlock
;
2339 /* Setup UST consumer socket and send fds to it */
2340 ret
= ust_consumer_send_session(ua_sess
, usess
->consumer
, socket
);
2342 goto error_rcu_unlock
;
2345 health_code_update(&health_thread_cmd
);
2348 /* This start the UST tracing */
2349 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2351 ERR("Error starting tracing for app pid: %d", app
->pid
);
2352 goto error_rcu_unlock
;
2355 health_code_update(&health_thread_cmd
);
2357 /* Quiescent wait after starting trace */
2358 ustctl_wait_quiescent(app
->sock
);
2362 health_code_update(&health_thread_cmd
);
2367 health_code_update(&health_thread_cmd
);
2372 * Stop tracing for a specific UST session and app.
2374 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2377 struct lttng_ht_iter iter
;
2378 struct ust_app_session
*ua_sess
;
2379 struct ust_app_channel
*ua_chan
;
2381 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2385 if (!app
->compatible
) {
2389 ua_sess
= lookup_session_by_app(usess
, app
);
2390 if (ua_sess
== NULL
) {
2395 * If started = 0, it means that stop trace has been called for a session
2396 * that was never started. This is a code flow error and should never
2399 assert(ua_sess
->started
== 1);
2401 health_code_update(&health_thread_cmd
);
2403 /* This inhibits UST tracing */
2404 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2406 ERR("Error stopping tracing for app pid: %d", app
->pid
);
2407 goto error_rcu_unlock
;
2410 health_code_update(&health_thread_cmd
);
2412 /* Quiescent wait after stopping trace */
2413 ustctl_wait_quiescent(app
->sock
);
2415 health_code_update(&health_thread_cmd
);
2417 /* Flushing buffers */
2418 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2420 health_code_update(&health_thread_cmd
);
2421 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2423 ERR("UST app PID %d channel %s flush failed with ret %d",
2424 app
->pid
, ua_chan
->name
, ret
);
2425 /* Continuing flushing all buffers */
2430 health_code_update(&health_thread_cmd
);
2432 /* Flush all buffers before stopping */
2433 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2435 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2441 health_code_update(&health_thread_cmd
);
2446 health_code_update(&health_thread_cmd
);
2451 * Destroy a specific UST session in apps.
2453 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2455 struct ust_app_session
*ua_sess
;
2456 struct lttng_ust_object_data obj
;
2457 struct lttng_ht_iter iter
;
2458 struct lttng_ht_node_ulong
*node
;
2461 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2465 if (!app
->compatible
) {
2469 __lookup_session_by_app(usess
, app
, &iter
);
2470 node
= lttng_ht_iter_get_node_ulong(&iter
);
2472 /* Session is being or is deleted. */
2475 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2476 ret
= lttng_ht_del(app
->sessions
, &iter
);
2478 /* Already scheduled for teardown. */
2482 obj
.handle
= ua_sess
->handle
;
2485 obj
.memory_map_size
= 0;
2486 health_code_update(&health_thread_cmd
);
2487 ustctl_release_object(app
->sock
, &obj
);
2489 health_code_update(&health_thread_cmd
);
2490 delete_ust_app_session(app
->sock
, ua_sess
);
2492 /* Quiescent wait after stopping trace */
2493 ustctl_wait_quiescent(app
->sock
);
2497 health_code_update(&health_thread_cmd
);
2502 * Start tracing for the UST session.
2504 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2507 struct lttng_ht_iter iter
;
2508 struct ust_app
*app
;
2510 DBG("Starting all UST traces");
2514 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2515 ret
= ust_app_start_trace(usess
, app
);
2517 /* Continue to next apps even on error */
2528 * Start tracing for the UST session.
2530 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2533 struct lttng_ht_iter iter
;
2534 struct ust_app
*app
;
2536 DBG("Stopping all UST traces");
2540 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2541 ret
= ust_app_stop_trace(usess
, app
);
2543 /* Continue to next apps even on error */
2554 * Destroy app UST session.
2556 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2559 struct lttng_ht_iter iter
;
2560 struct ust_app
*app
;
2562 DBG("Destroy all UST traces");
2566 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2567 ret
= destroy_trace(usess
, app
);
2569 /* Continue to next apps even on error */
2580 * Add channels/events from UST global domain to registered apps at sock.
2582 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2585 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2586 struct ust_app
*app
;
2587 struct ust_app_session
*ua_sess
;
2588 struct ust_app_channel
*ua_chan
;
2589 struct ust_app_event
*ua_event
;
2590 struct ust_app_ctx
*ua_ctx
;
2594 DBG2("UST app global update for app sock %d for session id %d", sock
,
2599 app
= find_app_by_sock(sock
);
2601 ERR("Failed to update app sock %d", sock
);
2605 if (!app
->compatible
) {
2609 ua_sess
= create_ust_app_session(usess
, app
);
2610 if (ua_sess
== NULL
|| ua_sess
== (void *) -1UL) {
2611 /* Tracer is gone for this session and has been freed */
2616 * We can iterate safely here over all UST app session sicne the create ust
2617 * app session above made a shadow copy of the UST global domain from the
2620 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2622 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2624 /* FIXME: Should we quit here or continue... */
2628 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2630 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2632 /* FIXME: Should we quit here or continue... */
2638 /* For each events */
2639 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2641 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2643 /* FIXME: Should we quit here or continue... */
2647 ret
= set_ust_event_filter(ua_event
, app
);
2649 /* FIXME: Should we quit here or continue... */
2655 if (usess
->start_trace
) {
2656 ret
= ust_app_start_trace(usess
, app
);
2661 DBG2("UST trace started for app pid %d", app
->pid
);
2670 * Add context to a specific channel for global UST domain.
2672 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2673 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2676 struct lttng_ht_node_str
*ua_chan_node
;
2677 struct lttng_ht_iter iter
, uiter
;
2678 struct ust_app_channel
*ua_chan
= NULL
;
2679 struct ust_app_session
*ua_sess
;
2680 struct ust_app
*app
;
2684 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2685 if (!app
->compatible
) {
2687 * TODO: In time, we should notice the caller of this error by
2688 * telling him that this is a version error.
2692 ua_sess
= lookup_session_by_app(usess
, app
);
2693 if (ua_sess
== NULL
) {
2697 /* Lookup channel in the ust app session */
2698 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2699 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2700 if (ua_chan_node
== NULL
) {
2703 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2706 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2717 * Enable event for a channel from a UST session for a specific PID.
2719 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2720 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2723 struct lttng_ht_iter iter
;
2724 struct lttng_ht_node_str
*ua_chan_node
;
2725 struct ust_app
*app
;
2726 struct ust_app_session
*ua_sess
;
2727 struct ust_app_channel
*ua_chan
;
2728 struct ust_app_event
*ua_event
;
2730 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2734 app
= ust_app_find_by_pid(pid
);
2736 ERR("UST app enable event per PID %d not found", pid
);
2741 if (!app
->compatible
) {
2746 ua_sess
= lookup_session_by_app(usess
, app
);
2748 /* The application has problem or is probably dead. */
2752 /* Lookup channel in the ust app session */
2753 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2754 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2755 /* If the channel is not found, there is a code flow error */
2756 assert(ua_chan_node
);
2758 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2760 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2761 uevent
->filter
, uevent
->attr
.loglevel
);
2762 if (ua_event
== NULL
) {
2763 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2768 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2780 * Disable event for a channel from a UST session for a specific PID.
2782 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2783 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2786 struct lttng_ht_iter iter
;
2787 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2788 struct ust_app
*app
;
2789 struct ust_app_session
*ua_sess
;
2790 struct ust_app_channel
*ua_chan
;
2791 struct ust_app_event
*ua_event
;
2793 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2797 app
= ust_app_find_by_pid(pid
);
2799 ERR("UST app disable event per PID %d not found", pid
);
2804 if (!app
->compatible
) {
2809 ua_sess
= lookup_session_by_app(usess
, app
);
2811 /* The application has problem or is probably dead. */
2815 /* Lookup channel in the ust app session */
2816 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2817 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2818 if (ua_chan_node
== NULL
) {
2819 /* Channel does not exist, skip disabling */
2822 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2824 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2825 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2826 if (ua_event_node
== NULL
) {
2827 /* Event does not exist, skip disabling */
2830 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2832 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2843 * Validate version of UST apps and set the compatible bit.
2845 int ust_app_validate_version(int sock
)
2848 struct ust_app
*app
;
2852 app
= find_app_by_sock(sock
);
2855 health_code_update(&health_thread_cmd
);
2857 ret
= ustctl_tracer_version(sock
, &app
->version
);
2862 /* Validate version */
2863 if (app
->version
.major
!= UST_APP_MAJOR_VERSION
) {
2867 DBG2("UST app PID %d is compatible with internal major version %d "
2868 "(supporting == %d)", app
->pid
, app
->version
.major
,
2869 UST_APP_MAJOR_VERSION
);
2870 app
->compatible
= 1;
2872 health_code_update(&health_thread_cmd
);
2876 DBG2("UST app PID %d is not compatible with internal major version %d "
2877 "(supporting == %d)", app
->pid
, app
->version
.major
,
2878 UST_APP_MAJOR_VERSION
);
2879 app
->compatible
= 0;
2881 health_code_update(&health_thread_cmd
);
2886 * Calibrate registered applications.
2888 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2891 struct lttng_ht_iter iter
;
2892 struct ust_app
*app
;
2896 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2897 if (!app
->compatible
) {
2899 * TODO: In time, we should notice the caller of this error by
2900 * telling him that this is a version error.
2905 health_code_update(&health_thread_cmd
);
2907 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2911 /* Means that it's not implemented on the tracer side. */
2915 /* TODO: Report error to user */
2916 DBG2("Calibrate app PID %d returned with error %d",
2923 DBG("UST app global domain calibration finished");
2927 health_code_update(&health_thread_cmd
);