2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include <sys/types.h>
27 #include <urcu/compiler.h>
28 #include <lttng/ust-error.h>
30 #include <common/common.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
36 #include "ust-consumer.h"
40 * Match function for the hash table lookup.
42 * It matches an ust app event based on three attributes which are the event
43 * name, the filter bytecode and the loglevel.
45 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
47 struct ust_app_event
*event
;
48 const struct ust_app_ht_key
*key
;
53 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
56 /* Match the 3 elements of the key: name, filter and loglevel. */
59 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
64 if (event
->attr
.loglevel
!= key
->loglevel
) {
65 if (event
->attr
.loglevel_type
== LTTNG_UST_LOGLEVEL_ALL
66 && key
->loglevel
== 0 && event
->attr
.loglevel
== -1) {
68 * Match is accepted. This is because on event creation, the
69 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
70 * -1 are accepted for this loglevel type since 0 is the one set by
71 * the API when receiving an enable event.
78 /* One of the filters is NULL, fail. */
79 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
83 if (key
->filter
&& event
->filter
) {
84 /* Both filters exists, check length followed by the bytecode. */
85 if (event
->filter
->len
!= key
->filter
->len
||
86 memcmp(event
->filter
->data
, key
->filter
->data
,
87 event
->filter
->len
) != 0) {
100 * Unique add of an ust app event in the given ht. This uses the custom
101 * ht_match_ust_app_event match function and the event name as hash.
103 static void add_unique_ust_app_event(struct lttng_ht
*ht
,
104 struct ust_app_event
*event
)
106 struct cds_lfht_node
*node_ptr
;
107 struct ust_app_ht_key key
;
113 key
.name
= event
->attr
.name
;
114 key
.filter
= event
->filter
;
115 key
.loglevel
= event
->attr
.loglevel
;
117 node_ptr
= cds_lfht_add_unique(ht
->ht
,
118 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
119 ht_match_ust_app_event
, &key
, &event
->node
.node
);
120 assert(node_ptr
== &event
->node
.node
);
124 * Delete ust context safely. RCU read lock must be held before calling
128 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
131 ustctl_release_object(sock
, ua_ctx
->obj
);
138 * Delete ust app event safely. RCU read lock must be held before calling
142 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
144 free(ua_event
->filter
);
146 if (ua_event
->obj
!= NULL
) {
147 ustctl_release_object(sock
, ua_event
->obj
);
154 * Delete ust app stream safely. RCU read lock must be held before calling
158 void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
161 ustctl_release_object(sock
, stream
->obj
);
162 lttng_fd_put(LTTNG_FD_APPS
, 2);
169 * Delete ust app channel safely. RCU read lock must be held before calling
173 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
176 struct lttng_ht_iter iter
;
177 struct ust_app_event
*ua_event
;
178 struct ust_app_ctx
*ua_ctx
;
179 struct ltt_ust_stream
*stream
, *stmp
;
182 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
183 cds_list_del(&stream
->list
);
184 delete_ust_app_stream(sock
, stream
);
188 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
189 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
191 delete_ust_app_ctx(sock
, ua_ctx
);
193 lttng_ht_destroy(ua_chan
->ctx
);
196 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
198 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
200 delete_ust_app_event(sock
, ua_event
);
202 lttng_ht_destroy(ua_chan
->events
);
204 if (ua_chan
->obj
!= NULL
) {
205 ustctl_release_object(sock
, ua_chan
->obj
);
206 lttng_fd_put(LTTNG_FD_APPS
, 2);
213 * Delete ust app session safely. RCU read lock must be held before calling
217 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
)
220 struct lttng_ht_iter iter
;
221 struct ust_app_channel
*ua_chan
;
223 if (ua_sess
->metadata
) {
224 if (ua_sess
->metadata
->stream_obj
) {
225 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
226 lttng_fd_put(LTTNG_FD_APPS
, 2);
227 free(ua_sess
->metadata
->stream_obj
);
229 if (ua_sess
->metadata
->obj
) {
230 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
231 lttng_fd_put(LTTNG_FD_APPS
, 2);
232 free(ua_sess
->metadata
->obj
);
234 trace_ust_destroy_metadata(ua_sess
->metadata
);
237 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
239 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
241 delete_ust_app_channel(sock
, ua_chan
);
243 lttng_ht_destroy(ua_sess
->channels
);
245 if (ua_sess
->handle
!= -1) {
246 ustctl_release_handle(sock
, ua_sess
->handle
);
252 * Delete a traceable application structure from the global list. Never call
253 * this function outside of a call_rcu call.
256 void delete_ust_app(struct ust_app
*app
)
259 struct ust_app_session
*ua_sess
, *tmp_ua_sess
;
263 /* Delete ust app sessions info */
267 lttng_ht_destroy(app
->sessions
);
270 cds_list_for_each_entry_safe(ua_sess
, tmp_ua_sess
, &app
->teardown_head
,
272 /* Free every object in the session and the session. */
273 delete_ust_app_session(sock
, ua_sess
);
277 * Wait until we have deleted the application from the sock hash table
278 * before closing this socket, otherwise an application could re-use the
279 * socket ID and race with the teardown, using the same hash table entry.
281 * It's OK to leave the close in call_rcu. We want it to stay unique for
282 * all RCU readers that could run concurrently with unregister app,
283 * therefore we _need_ to only close that socket after a grace period. So
284 * it should stay in this RCU callback.
286 * This close() is a very important step of the synchronization model so
287 * every modification to this function must be carefully reviewed.
293 lttng_fd_put(LTTNG_FD_APPS
, 1);
295 DBG2("UST app pid %d deleted", app
->pid
);
302 * URCU intermediate call to delete an UST app.
305 void delete_ust_app_rcu(struct rcu_head
*head
)
307 struct lttng_ht_node_ulong
*node
=
308 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
309 struct ust_app
*app
=
310 caa_container_of(node
, struct ust_app
, pid_n
);
312 DBG3("Call RCU deleting app PID %d", app
->pid
);
317 * Alloc new UST app session.
320 struct ust_app_session
*alloc_ust_app_session(void)
322 struct ust_app_session
*ua_sess
;
324 /* Init most of the default value by allocating and zeroing */
325 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
326 if (ua_sess
== NULL
) {
331 ua_sess
->handle
= -1;
332 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
341 * Alloc new UST app channel.
344 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
345 struct lttng_ust_channel
*attr
)
347 struct ust_app_channel
*ua_chan
;
349 /* Init most of the default value by allocating and zeroing */
350 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
351 if (ua_chan
== NULL
) {
356 /* Setup channel name */
357 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
358 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
360 ua_chan
->enabled
= 1;
361 ua_chan
->handle
= -1;
362 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
363 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
364 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
366 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
368 /* Copy attributes */
370 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
373 DBG3("UST app channel %s allocated", ua_chan
->name
);
382 * Alloc new UST app event.
385 struct ust_app_event
*alloc_ust_app_event(char *name
,
386 struct lttng_ust_event
*attr
)
388 struct ust_app_event
*ua_event
;
390 /* Init most of the default value by allocating and zeroing */
391 ua_event
= zmalloc(sizeof(struct ust_app_event
));
392 if (ua_event
== NULL
) {
397 ua_event
->enabled
= 1;
398 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
399 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
400 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
402 /* Copy attributes */
404 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
407 DBG3("UST app event %s allocated", ua_event
->name
);
416 * Alloc new UST app context.
419 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
421 struct ust_app_ctx
*ua_ctx
;
423 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
424 if (ua_ctx
== NULL
) {
429 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
432 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
439 * Allocate a filter and copy the given original filter.
441 * Return allocated filter or NULL on error.
443 static struct lttng_ust_filter_bytecode
*alloc_copy_ust_app_filter(
444 struct lttng_ust_filter_bytecode
*orig_f
)
446 struct lttng_ust_filter_bytecode
*filter
= NULL
;
448 /* Copy filter bytecode */
449 filter
= zmalloc(sizeof(*filter
) + orig_f
->len
);
451 PERROR("zmalloc alloc ust app filter");
455 memcpy(filter
, orig_f
, sizeof(*filter
) + orig_f
->len
);
462 * Find an ust_app using the sock and return it. RCU read side lock must be
463 * held before calling this helper function.
466 struct ust_app
*find_app_by_sock(int sock
)
468 struct lttng_ht_node_ulong
*node
;
469 struct lttng_ht_iter iter
;
471 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
472 node
= lttng_ht_iter_get_node_ulong(&iter
);
474 DBG2("UST app find by sock %d not found", sock
);
478 return caa_container_of(node
, struct ust_app
, sock_n
);
485 * Lookup for an ust app event based on event name, filter bytecode and the
488 * Return an ust_app_event object or NULL on error.
490 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
491 char *name
, struct lttng_ust_filter_bytecode
*filter
, int loglevel
)
493 struct lttng_ht_iter iter
;
494 struct lttng_ht_node_str
*node
;
495 struct ust_app_event
*event
= NULL
;
496 struct ust_app_ht_key key
;
501 /* Setup key for event lookup. */
504 key
.loglevel
= loglevel
;
506 /* Lookup using the event name as hash and a custom match fct. */
507 cds_lfht_lookup(ht
->ht
, ht
->hash_fct((void *) name
, lttng_ht_seed
),
508 ht_match_ust_app_event
, &key
, &iter
.iter
);
509 node
= lttng_ht_iter_get_node_str(&iter
);
514 event
= caa_container_of(node
, struct ust_app_event
, node
);
521 * Create the channel context on the tracer.
524 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
525 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
529 health_code_update(&health_thread_cmd
);
531 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
532 ua_chan
->obj
, &ua_ctx
->obj
);
537 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
539 DBG2("UST app context created successfully for channel %s", ua_chan
->name
);
542 health_code_update(&health_thread_cmd
);
547 * Set the filter on the tracer.
550 int set_ust_event_filter(struct ust_app_event
*ua_event
,
555 health_code_update(&health_thread_cmd
);
557 if (!ua_event
->filter
) {
562 ret
= ustctl_set_filter(app
->sock
, ua_event
->filter
,
568 DBG2("UST filter set successfully for event %s", ua_event
->name
);
571 health_code_update(&health_thread_cmd
);
576 * Disable the specified event on to UST tracer for the UST session.
578 static int disable_ust_event(struct ust_app
*app
,
579 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
583 health_code_update(&health_thread_cmd
);
585 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
587 ERR("UST app event %s disable failed for app (pid: %d) "
588 "and session handle %d with ret %d",
589 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
593 DBG2("UST app event %s disabled successfully for app (pid: %d)",
594 ua_event
->attr
.name
, app
->pid
);
597 health_code_update(&health_thread_cmd
);
602 * Disable the specified channel on to UST tracer for the UST session.
604 static int disable_ust_channel(struct ust_app
*app
,
605 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
609 health_code_update(&health_thread_cmd
);
611 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
613 ERR("UST app channel %s disable failed for app (pid: %d) "
614 "and session handle %d with ret %d",
615 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
619 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
620 ua_chan
->name
, app
->pid
);
623 health_code_update(&health_thread_cmd
);
628 * Enable the specified channel on to UST tracer for the UST session.
630 static int enable_ust_channel(struct ust_app
*app
,
631 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
635 health_code_update(&health_thread_cmd
);
637 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
639 ERR("UST app channel %s enable failed for app (pid: %d) "
640 "and session handle %d with ret %d",
641 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
645 ua_chan
->enabled
= 1;
647 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
648 ua_chan
->name
, app
->pid
);
651 health_code_update(&health_thread_cmd
);
656 * Enable the specified event on to UST tracer for the UST session.
658 static int enable_ust_event(struct ust_app
*app
,
659 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
663 health_code_update(&health_thread_cmd
);
665 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
667 ERR("UST app event %s enable failed for app (pid: %d) "
668 "and session handle %d with ret %d",
669 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
673 DBG2("UST app event %s enabled successfully for app (pid: %d)",
674 ua_event
->attr
.name
, app
->pid
);
677 health_code_update(&health_thread_cmd
);
682 * Open metadata onto the UST tracer for a UST session.
684 static int open_ust_metadata(struct ust_app
*app
,
685 struct ust_app_session
*ua_sess
)
688 struct lttng_ust_channel_attr uattr
;
690 health_code_update(&health_thread_cmd
);
692 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
693 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
694 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
695 uattr
.switch_timer_interval
=
696 ua_sess
->metadata
->attr
.switch_timer_interval
;
697 uattr
.read_timer_interval
=
698 ua_sess
->metadata
->attr
.read_timer_interval
;
699 uattr
.output
= ua_sess
->metadata
->attr
.output
;
701 /* We are going to receive 2 fds, we need to reserve them. */
702 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
704 ERR("Exhausted number of available FD upon metadata open");
707 /* UST tracer metadata creation */
708 ret
= ustctl_open_metadata(app
->sock
, ua_sess
->handle
, &uattr
,
709 &ua_sess
->metadata
->obj
);
711 ERR("UST app open metadata failed for app pid:%d with ret %d",
716 ua_sess
->metadata
->handle
= ua_sess
->metadata
->obj
->handle
;
719 health_code_update(&health_thread_cmd
);
724 * Create metadata stream onto the UST tracer for a given session.
726 static int create_ust_metadata_stream(struct ust_app
*app
,
727 struct ust_app_session
*ua_sess
)
731 health_code_update(&health_thread_cmd
);
733 /* We are going to receive 2 fds, we need to reserve them. */
734 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
736 ERR("Exhausted number of available FD upon metadata stream create");
739 ret
= ustctl_create_stream(app
->sock
, ua_sess
->metadata
->obj
,
740 &ua_sess
->metadata
->stream_obj
);
742 ERR("UST create metadata stream failed");
747 health_code_update(&health_thread_cmd
);
752 * Create stream onto the UST tracer for a given channel.
754 * Return -ENOENT if no more stream is available for this channel.
755 * On success, return 0.
756 * On error, return a negative value.
758 static int create_ust_stream(struct ust_app
*app
,
759 struct ust_app_channel
*ua_chan
, struct ltt_ust_stream
*stream
)
765 assert(ua_chan
->obj
);
768 health_code_update(&health_thread_cmd
);
770 /* We are going to receive 2 fds, we need to reserve them. */
771 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
773 ERR("Exhausted number of available FD on stream creation");
774 /* Just to make sure we never return -ENOENT. */
779 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
, &stream
->obj
);
781 lttng_fd_put(LTTNG_FD_APPS
, 2);
782 /* Indicates that there is no more stream for that channel. */
783 if (ret
!= -ENOENT
) {
784 ERR("UST create metadata stream failed (ret: %d)", ret
);
789 /* Set stream handle with the returned value. */
790 stream
->handle
= stream
->obj
->handle
;
793 health_code_update(&health_thread_cmd
);
798 * Create the specified channel onto the UST tracer for a UST session.
800 static int create_ust_channel(struct ust_app
*app
,
801 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
805 health_code_update(&health_thread_cmd
);
807 /* TODO: remove cast and use lttng-ust-abi.h */
809 /* We are going to receive 2 fds, we need to reserve them. */
810 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
812 ERR("Exhausted number of available FD upon create channel");
816 health_code_update(&health_thread_cmd
);
818 ret
= ustctl_create_channel(app
->sock
, ua_sess
->handle
,
819 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
821 ERR("Creating channel %s for app (pid: %d, sock: %d) "
822 "and session handle %d with ret %d",
823 ua_chan
->name
, app
->pid
, app
->sock
,
824 ua_sess
->handle
, ret
);
825 lttng_fd_put(LTTNG_FD_APPS
, 2);
829 ua_chan
->handle
= ua_chan
->obj
->handle
;
831 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
832 ua_chan
->name
, app
->pid
, app
->sock
);
834 health_code_update(&health_thread_cmd
);
836 /* If channel is not enabled, disable it on the tracer */
837 if (!ua_chan
->enabled
) {
838 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
845 health_code_update(&health_thread_cmd
);
850 * Create the specified event onto the UST tracer for a UST session.
853 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
854 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
858 health_code_update(&health_thread_cmd
);
860 /* Create UST event on tracer */
861 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
864 ERR("Error ustctl create event %s for app pid: %d with ret %d",
865 ua_event
->attr
.name
, app
->pid
, ret
);
869 ua_event
->handle
= ua_event
->obj
->handle
;
871 DBG2("UST app event %s created successfully for pid:%d",
872 ua_event
->attr
.name
, app
->pid
);
874 health_code_update(&health_thread_cmd
);
876 /* Set filter if one is present. */
877 if (ua_event
->filter
) {
878 ret
= set_ust_event_filter(ua_event
, app
);
884 /* If event not enabled, disable it on the tracer */
885 if (ua_event
->enabled
== 0) {
886 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
889 * If we hit an EPERM, something is wrong with our disable call. If
890 * we get an EEXIST, there is a problem on the tracer side since we
894 case -LTTNG_UST_ERR_PERM
:
895 /* Code flow problem */
897 case -LTTNG_UST_ERR_EXIST
:
898 /* It's OK for our use case. */
909 health_code_update(&health_thread_cmd
);
914 * Copy data between an UST app event and a LTT event.
916 static void shadow_copy_event(struct ust_app_event
*ua_event
,
917 struct ltt_ust_event
*uevent
)
919 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
920 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
922 ua_event
->enabled
= uevent
->enabled
;
924 /* Copy event attributes */
925 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
927 /* Copy filter bytecode */
928 if (uevent
->filter
) {
929 ua_event
->filter
= alloc_copy_ust_app_filter(uevent
->filter
);
930 /* Filter might be NULL here in case of ENONEM. */
935 * Copy data between an UST app channel and a LTT channel.
937 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
938 struct ltt_ust_channel
*uchan
)
940 struct lttng_ht_iter iter
;
941 struct ltt_ust_event
*uevent
;
942 struct ltt_ust_context
*uctx
;
943 struct ust_app_event
*ua_event
;
944 struct ust_app_ctx
*ua_ctx
;
946 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
948 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
949 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
950 /* Copy event attributes */
951 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
953 ua_chan
->enabled
= uchan
->enabled
;
955 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
956 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
957 if (ua_ctx
== NULL
) {
960 lttng_ht_node_init_ulong(&ua_ctx
->node
,
961 (unsigned long) ua_ctx
->ctx
.ctx
);
962 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
965 /* Copy all events from ltt ust channel to ust app channel */
966 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
967 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
968 uevent
->filter
, uevent
->attr
.loglevel
);
969 if (ua_event
== NULL
) {
970 DBG2("UST event %s not found on shadow copy channel",
972 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
973 if (ua_event
== NULL
) {
976 shadow_copy_event(ua_event
, uevent
);
977 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
981 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
985 * Copy data between a UST app session and a regular LTT session.
987 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
988 struct ltt_ust_session
*usess
, struct ust_app
*app
)
990 struct lttng_ht_node_str
*ua_chan_node
;
991 struct lttng_ht_iter iter
;
992 struct ltt_ust_channel
*uchan
;
993 struct ust_app_channel
*ua_chan
;
999 /* Get date and time for unique app path */
1001 timeinfo
= localtime(&rawtime
);
1002 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
1004 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
1006 ua_sess
->id
= usess
->id
;
1007 ua_sess
->uid
= usess
->uid
;
1008 ua_sess
->gid
= usess
->gid
;
1010 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s-%d-%s/", app
->name
, app
->pid
,
1013 PERROR("asprintf UST shadow copy session");
1014 /* TODO: We cannot return an error from here.. */
1018 /* TODO: support all UST domain */
1020 /* Iterate over all channels in global domain. */
1021 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
1023 struct lttng_ht_iter uiter
;
1025 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1026 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1027 if (ua_chan_node
!= NULL
) {
1028 /* Session exist. Contiuing. */
1032 DBG2("Channel %s not found on shadow session copy, creating it",
1034 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1035 if (ua_chan
== NULL
) {
1036 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
1040 shadow_copy_channel(ua_chan
, uchan
);
1041 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1046 * Lookup sesison wrapper.
1049 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
1050 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
1052 /* Get right UST app session from app */
1053 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
1057 * Return ust app session from the app session hashtable using the UST session
1060 static struct ust_app_session
*lookup_session_by_app(
1061 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1063 struct lttng_ht_iter iter
;
1064 struct lttng_ht_node_ulong
*node
;
1066 __lookup_session_by_app(usess
, app
, &iter
);
1067 node
= lttng_ht_iter_get_node_ulong(&iter
);
1072 return caa_container_of(node
, struct ust_app_session
, node
);
1079 * Create a session on the tracer side for the given app.
1081 * On success, ua_sess_ptr is populated with the session pointer or else left
1082 * untouched. If the session was created, is_created is set to 1. On error,
1083 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1086 * Returns 0 on success or else a negative code which is either -ENOMEM or
1087 * -ENOTCONN which is the default code if the ustctl_create_session fails.
1089 static int create_ust_app_session(struct ltt_ust_session
*usess
,
1090 struct ust_app
*app
, struct ust_app_session
**ua_sess_ptr
,
1093 int ret
, created
= 0;
1094 struct ust_app_session
*ua_sess
;
1098 assert(ua_sess_ptr
);
1100 health_code_update(&health_thread_cmd
);
1102 ua_sess
= lookup_session_by_app(usess
, app
);
1103 if (ua_sess
== NULL
) {
1104 DBG2("UST app pid: %d session id %d not found, creating it",
1105 app
->pid
, usess
->id
);
1106 ua_sess
= alloc_ust_app_session();
1107 if (ua_sess
== NULL
) {
1108 /* Only malloc can failed so something is really wrong */
1112 shadow_copy_session(ua_sess
, usess
, app
);
1116 health_code_update(&health_thread_cmd
);
1118 if (ua_sess
->handle
== -1) {
1119 ret
= ustctl_create_session(app
->sock
);
1121 ERR("Creating session for app pid %d", app
->pid
);
1122 delete_ust_app_session(-1, ua_sess
);
1123 if (ret
!= -ENOMEM
) {
1125 * Tracer is probably gone or got an internal error so let's
1126 * behave like it will soon unregister or not usable.
1133 ua_sess
->handle
= ret
;
1135 /* Add ust app session to app's HT */
1136 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
1137 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
1139 DBG2("UST app session created successfully with handle %d", ret
);
1142 *ua_sess_ptr
= ua_sess
;
1144 *is_created
= created
;
1146 /* Everything went well. */
1150 health_code_update(&health_thread_cmd
);
1155 * Create a context for the channel on the tracer.
1158 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
1159 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
1160 struct ust_app
*app
)
1163 struct lttng_ht_iter iter
;
1164 struct lttng_ht_node_ulong
*node
;
1165 struct ust_app_ctx
*ua_ctx
;
1167 DBG2("UST app adding context to channel %s", ua_chan
->name
);
1169 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
1170 node
= lttng_ht_iter_get_node_ulong(&iter
);
1176 ua_ctx
= alloc_ust_app_ctx(uctx
);
1177 if (ua_ctx
== NULL
) {
1183 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
1184 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1186 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
1196 * Enable on the tracer side a ust app event for the session and channel.
1199 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
1200 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1204 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1209 ua_event
->enabled
= 1;
1216 * Disable on the tracer side a ust app event for the session and channel.
1218 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
1219 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1223 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1228 ua_event
->enabled
= 0;
1235 * Lookup ust app channel for session and disable it on the tracer side.
1238 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1239 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1243 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1248 ua_chan
->enabled
= 0;
1255 * Lookup ust app channel for session and enable it on the tracer side.
1257 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1258 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1261 struct lttng_ht_iter iter
;
1262 struct lttng_ht_node_str
*ua_chan_node
;
1263 struct ust_app_channel
*ua_chan
;
1265 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1266 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1267 if (ua_chan_node
== NULL
) {
1268 DBG2("Unable to find channel %s in ust session id %u",
1269 uchan
->name
, ua_sess
->id
);
1273 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1275 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1285 * Create UST app channel and create it on the tracer. Set ua_chanp of the
1286 * newly created channel if not NULL.
1288 static int create_ust_app_channel(struct ust_app_session
*ua_sess
,
1289 struct ltt_ust_channel
*uchan
, struct ust_app
*app
,
1290 struct ust_app_channel
**ua_chanp
)
1293 struct lttng_ht_iter iter
;
1294 struct lttng_ht_node_str
*ua_chan_node
;
1295 struct ust_app_channel
*ua_chan
;
1297 /* Lookup channel in the ust app session */
1298 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1299 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1300 if (ua_chan_node
!= NULL
) {
1301 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1305 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1306 if (ua_chan
== NULL
) {
1307 /* Only malloc can fail here */
1311 shadow_copy_channel(ua_chan
, uchan
);
1313 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1315 /* Not found previously means that it does not exist on the tracer */
1316 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1320 /* Only add the channel if successful on the tracer side. */
1321 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1323 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1328 *ua_chanp
= ua_chan
;
1331 /* Everything went well. */
1335 delete_ust_app_channel(-1, ua_chan
);
1340 * Create UST app event and create it on the tracer side.
1343 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1344 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1345 struct ust_app
*app
)
1348 struct ust_app_event
*ua_event
;
1350 /* Get event node */
1351 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1352 uevent
->filter
, uevent
->attr
.loglevel
);
1353 if (ua_event
!= NULL
) {
1358 /* Does not exist so create one */
1359 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1360 if (ua_event
== NULL
) {
1361 /* Only malloc can failed so something is really wrong */
1365 shadow_copy_event(ua_event
, uevent
);
1367 /* Create it on the tracer side */
1368 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1370 /* Not found previously means that it does not exist on the tracer */
1371 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1375 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
1377 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1384 /* Valid. Calling here is already in a read side lock */
1385 delete_ust_app_event(-1, ua_event
);
1390 * Create UST metadata and open it on the tracer side.
1392 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1393 char *pathname
, struct ust_app
*app
)
1397 if (ua_sess
->metadata
== NULL
) {
1398 /* Allocate UST metadata */
1399 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1400 if (ua_sess
->metadata
== NULL
) {
1401 /* malloc() failed */
1405 ret
= open_ust_metadata(app
, ua_sess
);
1407 DBG3("Opening metadata failed. Cleaning up memory");
1409 /* Cleanup failed metadata struct */
1410 free(ua_sess
->metadata
);
1412 * This is very important because delete_ust_app_session check if
1413 * the pointer is null or not in order to delete the metadata.
1415 ua_sess
->metadata
= NULL
;
1419 DBG2("UST metadata opened for app pid %d", app
->pid
);
1422 /* Open UST metadata stream */
1423 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1424 ret
= create_ust_metadata_stream(app
, ua_sess
);
1429 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1430 "%s/metadata", ua_sess
->path
);
1432 PERROR("asprintf UST create stream");
1436 DBG2("UST metadata stream object created for app pid %d",
1439 ERR("Attempting to create stream without metadata opened");
1450 * Return pointer to traceable apps list.
1452 struct lttng_ht
*ust_app_get_ht(void)
1458 * Return ust app pointer or NULL if not found.
1460 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1462 struct lttng_ht_node_ulong
*node
;
1463 struct lttng_ht_iter iter
;
1466 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1467 node
= lttng_ht_iter_get_node_ulong(&iter
);
1469 DBG2("UST app no found with pid %d", pid
);
1474 DBG2("Found UST app by pid %d", pid
);
1476 return caa_container_of(node
, struct ust_app
, pid_n
);
1484 * Using pid and uid (of the app), allocate a new ust_app struct and
1485 * add it to the global traceable app list.
1487 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1488 * bitness is not supported.
1490 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1492 struct ust_app
*lta
;
1495 if ((msg
->bits_per_long
== 64 &&
1496 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
1497 || (msg
->bits_per_long
== 32 &&
1498 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
1499 ERR("Registration failed: application \"%s\" (pid: %d) has "
1500 "%d-bit long, but no consumerd for this long size is available.\n",
1501 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1506 lttng_fd_put(LTTNG_FD_APPS
, 1);
1509 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1510 ERR("Registration failed: application \"%s\" (pid: %d) has "
1511 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1512 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1517 lttng_fd_put(LTTNG_FD_APPS
, 1);
1520 lta
= zmalloc(sizeof(struct ust_app
));
1526 lta
->ppid
= msg
->ppid
;
1527 lta
->uid
= msg
->uid
;
1528 lta
->gid
= msg
->gid
;
1529 lta
->compatible
= 0; /* Not compatible until proven */
1530 lta
->bits_per_long
= msg
->bits_per_long
;
1531 lta
->v_major
= msg
->major
;
1532 lta
->v_minor
= msg
->minor
;
1533 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1534 lta
->name
[16] = '\0';
1535 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1537 lta
->pid
= msg
->pid
;
1538 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1540 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1542 CDS_INIT_LIST_HEAD(<a
->teardown_head
);
1547 * On a re-registration, we want to kick out the previous registration of
1550 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1553 * The socket _should_ be unique until _we_ call close. So, a add_unique
1554 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1555 * already in the table.
1557 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1561 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1562 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1563 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1569 * Unregister app by removing it from the global traceable app list and freeing
1572 * The socket is already closed at this point so no close to sock.
1574 void ust_app_unregister(int sock
)
1576 struct ust_app
*lta
;
1577 struct lttng_ht_node_ulong
*node
;
1578 struct lttng_ht_iter iter
;
1579 struct ust_app_session
*ua_sess
;
1584 /* Get the node reference for a call_rcu */
1585 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1586 node
= lttng_ht_iter_get_node_ulong(&iter
);
1588 ERR("Unable to find app by sock %d", sock
);
1592 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1594 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1596 /* Remove application from PID hash table */
1597 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1600 /* Assign second node for deletion */
1601 iter
.iter
.node
= <a
->pid_n
.node
;
1604 * Ignore return value since the node might have been removed before by an
1605 * add replace during app registration because the PID can be reassigned by
1608 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1610 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1614 /* Remove sessions so they are not visible during deletion.*/
1615 cds_lfht_for_each_entry(lta
->sessions
->ht
, &iter
.iter
, ua_sess
,
1617 ret
= lttng_ht_del(lta
->sessions
, &iter
);
1619 /* The session was already removed so scheduled for teardown. */
1624 * Add session to list for teardown. This is safe since at this point we
1625 * are the only one using this list.
1627 cds_list_add(&ua_sess
->teardown_node
, <a
->teardown_head
);
1631 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1639 * Return traceable_app_count
1641 unsigned long ust_app_list_count(void)
1643 unsigned long count
;
1646 count
= lttng_ht_get_count(ust_app_ht
);
1653 * Fill events array with all events name of all registered apps.
1655 int ust_app_list_events(struct lttng_event
**events
)
1658 size_t nbmem
, count
= 0;
1659 struct lttng_ht_iter iter
;
1660 struct ust_app
*app
;
1661 struct lttng_event
*tmp_event
;
1663 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1664 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1665 if (tmp_event
== NULL
) {
1666 PERROR("zmalloc ust app events");
1673 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1674 struct lttng_ust_tracepoint_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_list(app
->sock
);
1687 ERR("UST app list events getting handle failed for app pid %d",
1692 while ((ret
= ustctl_tracepoint_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 */
1699 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1702 ptr
= realloc(tmp_event
, nbmem
* sizeof(struct lttng_event
));
1704 PERROR("realloc ust app events");
1711 memcpy(tmp_event
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1712 tmp_event
[count
].loglevel
= uiter
.loglevel
;
1713 tmp_event
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
1714 tmp_event
[count
].pid
= app
->pid
;
1715 tmp_event
[count
].enabled
= -1;
1721 *events
= tmp_event
;
1723 DBG2("UST app list events done (%zu events)", count
);
1728 health_code_update(&health_thread_cmd
);
1733 * Fill events array with all events name of all registered apps.
1735 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
1738 size_t nbmem
, count
= 0;
1739 struct lttng_ht_iter iter
;
1740 struct ust_app
*app
;
1741 struct lttng_event_field
*tmp_event
;
1743 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1744 tmp_event
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
1745 if (tmp_event
== NULL
) {
1746 PERROR("zmalloc ust app event fields");
1753 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1754 struct lttng_ust_field_iter uiter
;
1756 health_code_update(&health_thread_cmd
);
1758 if (!app
->compatible
) {
1760 * TODO: In time, we should notice the caller of this error by
1761 * telling him that this is a version error.
1765 handle
= ustctl_tracepoint_field_list(app
->sock
);
1767 ERR("UST app list event fields getting handle failed for app pid %d",
1772 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
1773 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1774 health_code_update(&health_thread_cmd
);
1775 if (count
>= nbmem
) {
1776 /* In case the realloc fails, we free the memory */
1779 DBG2("Reallocating event field list from %zu to %zu entries", nbmem
,
1782 ptr
= realloc(tmp_event
, nbmem
* sizeof(struct lttng_event_field
));
1784 PERROR("realloc ust app event fields");
1792 memcpy(tmp_event
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
1793 tmp_event
[count
].type
= uiter
.type
;
1794 tmp_event
[count
].nowrite
= uiter
.nowrite
;
1796 memcpy(tmp_event
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1797 tmp_event
[count
].event
.loglevel
= uiter
.loglevel
;
1798 tmp_event
[count
].event
.type
= LTTNG_UST_TRACEPOINT
;
1799 tmp_event
[count
].event
.pid
= app
->pid
;
1800 tmp_event
[count
].event
.enabled
= -1;
1806 *fields
= tmp_event
;
1808 DBG2("UST app list event fields done (%zu events)", count
);
1813 health_code_update(&health_thread_cmd
);
1818 * Free and clean all traceable apps of the global list.
1820 void ust_app_clean_list(void)
1823 struct ust_app
*app
;
1824 struct lttng_ht_iter iter
;
1826 DBG2("UST app cleaning registered apps hash table");
1830 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1831 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1833 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
1836 /* Cleanup socket hash table */
1837 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
1839 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1843 /* Destroy is done only when the ht is empty */
1844 lttng_ht_destroy(ust_app_ht
);
1845 lttng_ht_destroy(ust_app_ht_by_sock
);
1851 * Init UST app hash table.
1853 void ust_app_ht_alloc(void)
1855 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1856 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1860 * For a specific UST session, disable the channel for all registered apps.
1862 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1863 struct ltt_ust_channel
*uchan
)
1866 struct lttng_ht_iter iter
;
1867 struct lttng_ht_node_str
*ua_chan_node
;
1868 struct ust_app
*app
;
1869 struct ust_app_session
*ua_sess
;
1870 struct ust_app_channel
*ua_chan
;
1872 if (usess
== NULL
|| uchan
== NULL
) {
1873 ERR("Disabling UST global channel with NULL values");
1878 DBG2("UST app disabling channel %s from global domain for session id %d",
1879 uchan
->name
, usess
->id
);
1883 /* For every registered applications */
1884 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1885 struct lttng_ht_iter uiter
;
1886 if (!app
->compatible
) {
1888 * TODO: In time, we should notice the caller of this error by
1889 * telling him that this is a version error.
1893 ua_sess
= lookup_session_by_app(usess
, app
);
1894 if (ua_sess
== NULL
) {
1899 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1900 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1901 /* If the session if found for the app, the channel must be there */
1902 assert(ua_chan_node
);
1904 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1905 /* The channel must not be already disabled */
1906 assert(ua_chan
->enabled
== 1);
1908 /* Disable channel onto application */
1909 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1911 /* XXX: We might want to report this error at some point... */
1923 * For a specific UST session, enable the channel for all registered apps.
1925 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1926 struct ltt_ust_channel
*uchan
)
1929 struct lttng_ht_iter iter
;
1930 struct ust_app
*app
;
1931 struct ust_app_session
*ua_sess
;
1933 if (usess
== NULL
|| uchan
== NULL
) {
1934 ERR("Adding UST global channel to NULL values");
1939 DBG2("UST app enabling channel %s to global domain for session id %d",
1940 uchan
->name
, usess
->id
);
1944 /* For every registered applications */
1945 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1946 if (!app
->compatible
) {
1948 * TODO: In time, we should notice the caller of this error by
1949 * telling him that this is a version error.
1953 ua_sess
= lookup_session_by_app(usess
, app
);
1954 if (ua_sess
== NULL
) {
1958 /* Enable channel onto application */
1959 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1961 /* XXX: We might want to report this error at some point... */
1973 * Disable an event in a channel and for a specific session.
1975 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1976 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1979 struct lttng_ht_iter iter
, uiter
;
1980 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1981 struct ust_app
*app
;
1982 struct ust_app_session
*ua_sess
;
1983 struct ust_app_channel
*ua_chan
;
1984 struct ust_app_event
*ua_event
;
1986 DBG("UST app disabling event %s for all apps in channel "
1987 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1991 /* For all registered applications */
1992 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1993 if (!app
->compatible
) {
1995 * TODO: In time, we should notice the caller of this error by
1996 * telling him that this is a version error.
2000 ua_sess
= lookup_session_by_app(usess
, app
);
2001 if (ua_sess
== NULL
) {
2006 /* Lookup channel in the ust app session */
2007 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2008 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2009 if (ua_chan_node
== NULL
) {
2010 DBG2("Channel %s not found in session id %d for app pid %d."
2011 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
2014 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2016 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
2017 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
2018 if (ua_event_node
== NULL
) {
2019 DBG2("Event %s not found in channel %s for app pid %d."
2020 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
2023 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2025 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2027 /* XXX: Report error someday... */
2038 * For a specific UST session and UST channel, the event for all
2041 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
2042 struct ltt_ust_channel
*uchan
)
2045 struct lttng_ht_iter iter
, uiter
;
2046 struct lttng_ht_node_str
*ua_chan_node
;
2047 struct ust_app
*app
;
2048 struct ust_app_session
*ua_sess
;
2049 struct ust_app_channel
*ua_chan
;
2050 struct ust_app_event
*ua_event
;
2052 DBG("UST app disabling all event for all apps in channel "
2053 "%s for session id %d", uchan
->name
, usess
->id
);
2057 /* For all registered applications */
2058 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2059 if (!app
->compatible
) {
2061 * TODO: In time, we should notice the caller of this error by
2062 * telling him that this is a version error.
2066 ua_sess
= lookup_session_by_app(usess
, app
);
2068 /* The application has problem or is probably dead. */
2072 /* Lookup channel in the ust app session */
2073 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2074 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2075 /* If the channel is not found, there is a code flow error */
2076 assert(ua_chan_node
);
2078 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2080 /* Disable each events of channel */
2081 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2083 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2085 /* XXX: Report error someday... */
2097 * For a specific UST session, create the channel for all registered apps.
2099 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
2100 struct ltt_ust_channel
*uchan
)
2102 int ret
= 0, created
;
2103 struct lttng_ht_iter iter
;
2104 struct ust_app
*app
;
2105 struct ust_app_session
*ua_sess
= NULL
;
2107 /* Very wrong code flow */
2111 DBG2("UST app adding channel %s to global domain for session id %d",
2112 uchan
->name
, usess
->id
);
2116 /* For every registered applications */
2117 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2118 if (!app
->compatible
) {
2120 * TODO: In time, we should notice the caller of this error by
2121 * telling him that this is a version error.
2126 * Create session on the tracer side and add it to app session HT. Note
2127 * that if session exist, it will simply return a pointer to the ust
2130 ret
= create_ust_app_session(usess
, app
, &ua_sess
, &created
);
2135 * The application's socket is not valid. Either a bad socket
2136 * or a timeout on it. We can't inform the caller that for a
2137 * specific app, the session failed so lets continue here.
2142 goto error_rcu_unlock
;
2147 /* Create channel onto application. We don't need the chan ref. */
2148 ret
= create_ust_app_channel(ua_sess
, uchan
, app
, NULL
);
2150 if (ret
== -ENOMEM
) {
2151 /* No more memory is a fatal error. Stop right now. */
2152 goto error_rcu_unlock
;
2154 /* Cleanup the created session if it's the case. */
2156 delete_ust_app_session(app
->sock
, ua_sess
);
2167 * Enable event for a specific session and channel on the tracer.
2169 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
2170 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2173 struct lttng_ht_iter iter
, uiter
;
2174 struct lttng_ht_node_str
*ua_chan_node
;
2175 struct ust_app
*app
;
2176 struct ust_app_session
*ua_sess
;
2177 struct ust_app_channel
*ua_chan
;
2178 struct ust_app_event
*ua_event
;
2180 DBG("UST app enabling event %s for all apps for session id %d",
2181 uevent
->attr
.name
, usess
->id
);
2184 * NOTE: At this point, this function is called only if the session and
2185 * channel passed are already created for all apps. and enabled on the
2191 /* For all registered applications */
2192 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2193 if (!app
->compatible
) {
2195 * TODO: In time, we should notice the caller of this error by
2196 * telling him that this is a version error.
2200 ua_sess
= lookup_session_by_app(usess
, app
);
2202 /* The application has problem or is probably dead. */
2206 /* Lookup channel in the ust app session */
2207 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2208 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2209 /* If the channel is not found, there is a code flow error */
2210 assert(ua_chan_node
);
2212 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2214 /* Get event node */
2215 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2216 uevent
->filter
, uevent
->attr
.loglevel
);
2217 if (ua_event
== NULL
) {
2218 DBG3("UST app enable event %s not found for app PID %d."
2219 "Skipping app", uevent
->attr
.name
, app
->pid
);
2223 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2235 * For a specific existing UST session and UST channel, creates the event for
2236 * all registered apps.
2238 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
2239 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2242 struct lttng_ht_iter iter
, uiter
;
2243 struct lttng_ht_node_str
*ua_chan_node
;
2244 struct ust_app
*app
;
2245 struct ust_app_session
*ua_sess
;
2246 struct ust_app_channel
*ua_chan
;
2248 DBG("UST app creating event %s for all apps for session id %d",
2249 uevent
->attr
.name
, usess
->id
);
2253 /* For all registered applications */
2254 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2255 if (!app
->compatible
) {
2257 * TODO: In time, we should notice the caller of this error by
2258 * telling him that this is a version error.
2262 ua_sess
= lookup_session_by_app(usess
, app
);
2264 /* The application has problem or is probably dead. */
2268 /* Lookup channel in the ust app session */
2269 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2270 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2271 /* If the channel is not found, there is a code flow error */
2272 assert(ua_chan_node
);
2274 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2276 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2278 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
2279 /* Possible value at this point: -ENOMEM. If so, we stop! */
2282 DBG2("UST app event %s already exist on app PID %d",
2283 uevent
->attr
.name
, app
->pid
);
2294 * Start tracing for a specific UST session and app.
2296 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2299 struct lttng_ht_iter iter
;
2300 struct ust_app_session
*ua_sess
;
2301 struct ust_app_channel
*ua_chan
;
2302 struct ltt_ust_stream
*ustream
;
2303 struct consumer_socket
*socket
;
2305 DBG("Starting tracing for ust app pid %d", app
->pid
);
2309 if (!app
->compatible
) {
2313 ua_sess
= lookup_session_by_app(usess
, app
);
2314 if (ua_sess
== NULL
) {
2315 /* The session is in teardown process. Ignore and continue. */
2319 /* Upon restart, we skip the setup, already done */
2320 if (ua_sess
->started
) {
2324 /* Create directories if consumer is LOCAL and has a path defined. */
2325 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2326 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
2327 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
2328 S_IRWXU
| S_IRWXG
, usess
->uid
, usess
->gid
);
2330 if (ret
!= -EEXIST
) {
2331 ERR("Trace directory creation error");
2333 goto error_rcu_unlock
;
2338 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
2340 ret
= LTTNG_ERR_UST_META_FAIL
;
2341 goto error_rcu_unlock
;
2344 /* For each channel */
2345 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2347 /* Create all streams */
2349 /* Create UST stream */
2350 ustream
= zmalloc(sizeof(*ustream
));
2351 if (ustream
== NULL
) {
2352 PERROR("zmalloc ust stream");
2353 goto error_rcu_unlock
;
2356 health_code_update(&health_thread_cmd
);
2358 ret
= create_ust_stream(app
, ua_chan
, ustream
);
2360 /* Free unused memory after this point. */
2362 if (ret
== -ENOENT
) {
2363 /* Got all streams. Continue normal execution. */
2366 /* Error at this point. Stop everything. */
2367 ret
= LTTNG_ERR_UST_STREAM_FAIL
;
2368 goto error_rcu_unlock
;
2371 health_code_update(&health_thread_cmd
);
2373 /* Order is important */
2374 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2375 ret
= snprintf(ustream
->name
, sizeof(ustream
->name
), "%s_%u",
2376 ua_chan
->name
, ua_chan
->streams
.count
);
2377 ua_chan
->streams
.count
++;
2379 PERROR("asprintf UST create stream");
2381 * XXX what should we do here with the
2386 DBG2("UST stream %d ready (handle: %d)", ua_chan
->streams
.count
,
2390 health_code_update(&health_thread_cmd
);
2393 switch (app
->bits_per_long
) {
2395 socket
= consumer_find_socket(uatomic_read(&ust_consumerd64_fd
),
2397 if (socket
== NULL
) {
2402 socket
= consumer_find_socket(uatomic_read(&ust_consumerd32_fd
),
2404 if (socket
== NULL
) {
2410 goto error_rcu_unlock
;
2413 /* Setup UST consumer socket and send fds to it */
2414 ret
= ust_consumer_send_session(ua_sess
, usess
->consumer
, socket
);
2416 goto error_rcu_unlock
;
2419 health_code_update(&health_thread_cmd
);
2422 /* This start the UST tracing */
2423 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2425 ERR("Error starting tracing for app pid: %d (ret: %d)", app
->pid
, ret
);
2426 goto error_rcu_unlock
;
2429 /* Indicate that the session has been started once */
2430 ua_sess
->started
= 1;
2432 health_code_update(&health_thread_cmd
);
2434 /* Quiescent wait after starting trace */
2435 ustctl_wait_quiescent(app
->sock
);
2439 health_code_update(&health_thread_cmd
);
2444 health_code_update(&health_thread_cmd
);
2449 * Stop tracing for a specific UST session and app.
2451 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2454 struct lttng_ht_iter iter
;
2455 struct ust_app_session
*ua_sess
;
2456 struct ust_app_channel
*ua_chan
;
2458 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2462 if (!app
->compatible
) {
2466 ua_sess
= lookup_session_by_app(usess
, app
);
2467 if (ua_sess
== NULL
) {
2472 * If started = 0, it means that stop trace has been called for a session
2473 * that was never started. It's possible since we can have a fail start
2474 * from either the application manager thread or the command thread. Simply
2475 * indicate that this is a stop error.
2477 if (!ua_sess
->started
) {
2478 goto error_rcu_unlock
;
2481 health_code_update(&health_thread_cmd
);
2483 /* This inhibits UST tracing */
2484 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2486 ERR("Error stopping tracing for app pid: %d (ret: %d)", app
->pid
, ret
);
2487 goto error_rcu_unlock
;
2490 health_code_update(&health_thread_cmd
);
2492 /* Quiescent wait after stopping trace */
2493 ustctl_wait_quiescent(app
->sock
);
2495 health_code_update(&health_thread_cmd
);
2497 /* Flushing buffers */
2498 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2500 health_code_update(&health_thread_cmd
);
2501 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2503 ERR("UST app PID %d channel %s flush failed with ret %d",
2504 app
->pid
, ua_chan
->name
, ret
);
2505 /* Continuing flushing all buffers */
2510 health_code_update(&health_thread_cmd
);
2512 /* Flush all buffers before stopping */
2513 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2515 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2521 health_code_update(&health_thread_cmd
);
2526 health_code_update(&health_thread_cmd
);
2531 * Destroy a specific UST session in apps.
2533 static int destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2535 struct ust_app_session
*ua_sess
;
2536 struct lttng_ust_object_data obj
;
2537 struct lttng_ht_iter iter
;
2538 struct lttng_ht_node_ulong
*node
;
2541 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2545 if (!app
->compatible
) {
2549 __lookup_session_by_app(usess
, app
, &iter
);
2550 node
= lttng_ht_iter_get_node_ulong(&iter
);
2552 /* Session is being or is deleted. */
2555 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2556 ret
= lttng_ht_del(app
->sessions
, &iter
);
2558 /* Already scheduled for teardown. */
2562 obj
.handle
= ua_sess
->handle
;
2565 obj
.memory_map_size
= 0;
2566 health_code_update(&health_thread_cmd
);
2567 ustctl_release_object(app
->sock
, &obj
);
2569 health_code_update(&health_thread_cmd
);
2570 delete_ust_app_session(app
->sock
, ua_sess
);
2572 /* Quiescent wait after stopping trace */
2573 ustctl_wait_quiescent(app
->sock
);
2577 health_code_update(&health_thread_cmd
);
2582 * Start tracing for the UST session.
2584 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2587 struct lttng_ht_iter iter
;
2588 struct ust_app
*app
;
2590 DBG("Starting all UST traces");
2594 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2595 ret
= ust_app_start_trace(usess
, app
);
2597 /* Continue to next apps even on error */
2608 * Start tracing for the UST session.
2610 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2613 struct lttng_ht_iter iter
;
2614 struct ust_app
*app
;
2616 DBG("Stopping all UST traces");
2620 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2621 ret
= ust_app_stop_trace(usess
, app
);
2623 /* Continue to next apps even on error */
2634 * Destroy app UST session.
2636 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2639 struct lttng_ht_iter iter
;
2640 struct ust_app
*app
;
2642 DBG("Destroy all UST traces");
2646 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2647 ret
= destroy_trace(usess
, app
);
2649 /* Continue to next apps even on error */
2660 * Add channels/events from UST global domain to registered apps at sock.
2662 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2665 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2666 struct ust_app
*app
;
2667 struct ust_app_session
*ua_sess
= NULL
;
2668 struct ust_app_channel
*ua_chan
;
2669 struct ust_app_event
*ua_event
;
2670 struct ust_app_ctx
*ua_ctx
;
2674 DBG2("UST app global update for app sock %d for session id %d", sock
,
2679 app
= find_app_by_sock(sock
);
2681 ERR("Failed to update app sock %d", sock
);
2685 if (!app
->compatible
) {
2689 ret
= create_ust_app_session(usess
, app
, &ua_sess
, NULL
);
2691 /* Tracer is probably gone or ENOMEM. */
2697 * We can iterate safely here over all UST app session sicne the create ust
2698 * app session above made a shadow copy of the UST global domain from the
2701 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2703 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2705 /* FIXME: Should we quit here or continue... */
2709 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2711 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2713 /* FIXME: Should we quit here or continue... */
2719 /* For each events */
2720 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2722 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2724 /* FIXME: Should we quit here or continue... */
2730 if (usess
->start_trace
) {
2731 ret
= ust_app_start_trace(usess
, app
);
2736 DBG2("UST trace started for app pid %d", app
->pid
);
2745 * Add context to a specific channel for global UST domain.
2747 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2748 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2751 struct lttng_ht_node_str
*ua_chan_node
;
2752 struct lttng_ht_iter iter
, uiter
;
2753 struct ust_app_channel
*ua_chan
= NULL
;
2754 struct ust_app_session
*ua_sess
;
2755 struct ust_app
*app
;
2759 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2760 if (!app
->compatible
) {
2762 * TODO: In time, we should notice the caller of this error by
2763 * telling him that this is a version error.
2767 ua_sess
= lookup_session_by_app(usess
, app
);
2768 if (ua_sess
== NULL
) {
2772 /* Lookup channel in the ust app session */
2773 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2774 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2775 if (ua_chan_node
== NULL
) {
2778 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2781 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2792 * Enable event for a channel from a UST session for a specific PID.
2794 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2795 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2798 struct lttng_ht_iter iter
;
2799 struct lttng_ht_node_str
*ua_chan_node
;
2800 struct ust_app
*app
;
2801 struct ust_app_session
*ua_sess
;
2802 struct ust_app_channel
*ua_chan
;
2803 struct ust_app_event
*ua_event
;
2805 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2809 app
= ust_app_find_by_pid(pid
);
2811 ERR("UST app enable event per PID %d not found", pid
);
2816 if (!app
->compatible
) {
2821 ua_sess
= lookup_session_by_app(usess
, app
);
2823 /* The application has problem or is probably dead. */
2827 /* Lookup channel in the ust app session */
2828 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2829 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2830 /* If the channel is not found, there is a code flow error */
2831 assert(ua_chan_node
);
2833 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2835 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2836 uevent
->filter
, uevent
->attr
.loglevel
);
2837 if (ua_event
== NULL
) {
2838 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2843 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2855 * Disable event for a channel from a UST session for a specific PID.
2857 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2858 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2861 struct lttng_ht_iter iter
;
2862 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2863 struct ust_app
*app
;
2864 struct ust_app_session
*ua_sess
;
2865 struct ust_app_channel
*ua_chan
;
2866 struct ust_app_event
*ua_event
;
2868 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2872 app
= ust_app_find_by_pid(pid
);
2874 ERR("UST app disable event per PID %d not found", pid
);
2879 if (!app
->compatible
) {
2884 ua_sess
= lookup_session_by_app(usess
, app
);
2886 /* The application has problem or is probably dead. */
2890 /* Lookup channel in the ust app session */
2891 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2892 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2893 if (ua_chan_node
== NULL
) {
2894 /* Channel does not exist, skip disabling */
2897 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2899 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2900 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2901 if (ua_event_node
== NULL
) {
2902 /* Event does not exist, skip disabling */
2905 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2907 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2918 * Validate version of UST apps and set the compatible bit.
2920 int ust_app_validate_version(int sock
)
2923 struct ust_app
*app
;
2927 app
= find_app_by_sock(sock
);
2930 health_code_update(&health_thread_cmd
);
2932 ret
= ustctl_tracer_version(sock
, &app
->version
);
2937 /* Validate version */
2938 if (app
->version
.major
!= UST_APP_MAJOR_VERSION
) {
2942 DBG2("UST app PID %d is compatible with internal major version %d "
2943 "(supporting == %d)", app
->pid
, app
->version
.major
,
2944 UST_APP_MAJOR_VERSION
);
2945 app
->compatible
= 1;
2947 health_code_update(&health_thread_cmd
);
2951 DBG2("UST app PID %d is not compatible with internal major version %d "
2952 "(supporting == %d)", app
->pid
, app
->version
.major
,
2953 UST_APP_MAJOR_VERSION
);
2954 app
->compatible
= 0;
2956 health_code_update(&health_thread_cmd
);
2961 * Calibrate registered applications.
2963 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2966 struct lttng_ht_iter iter
;
2967 struct ust_app
*app
;
2971 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2972 if (!app
->compatible
) {
2974 * TODO: In time, we should notice the caller of this error by
2975 * telling him that this is a version error.
2980 health_code_update(&health_thread_cmd
);
2982 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2986 /* Means that it's not implemented on the tracer side. */
2990 /* TODO: Report error to user */
2991 DBG2("Calibrate app PID %d returned with error %d",
2998 DBG("UST app global domain calibration finished");
3002 health_code_update(&health_thread_cmd
);