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"
39 static int ht_match_ust_app_event(struct cds_lfht_node
*node
, const void *_key
)
41 struct ust_app_event
*event
;
42 const struct ust_app_ht_key
*key
;
47 event
= caa_container_of(node
, struct ust_app_event
, node
.node
);
50 /* Match the 3 elements of the key: name, filter and loglevel. */
53 if (strncmp(event
->attr
.name
, key
->name
, sizeof(event
->attr
.name
)) != 0) {
58 if (event
->attr
.loglevel
!= key
->loglevel
) {
62 /* One of the filters is NULL, fail. */
63 if ((key
->filter
&& !event
->filter
) || (!key
->filter
&& event
->filter
)) {
67 /* Both filters are NULL, success. */
68 if (!key
->filter
&& !event
->filter
) {
72 /* Both filters exists, check length followed by the bytecode. */
73 if (event
->filter
->len
== key
->filter
->len
&&
74 memcmp(event
->filter
->data
, key
->filter
->data
,
75 event
->filter
->len
) == 0) {
87 static void add_unique_ust_app_event(struct lttng_ht
*ht
,
88 struct ust_app_event
*event
)
90 struct cds_lfht_node
*node_ptr
;
91 struct ust_app_ht_key key
;
97 key
.name
= event
->attr
.name
;
98 key
.filter
= event
->filter
;
99 key
.loglevel
= event
->attr
.loglevel
;
101 node_ptr
= cds_lfht_add_unique(ht
->ht
,
102 ht
->hash_fct(event
->node
.key
, lttng_ht_seed
),
103 ht_match_ust_app_event
, &key
, &event
->node
.node
);
104 assert(node_ptr
== &event
->node
.node
);
108 * Delete ust context safely. RCU read lock must be held before calling
112 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
115 ustctl_release_object(sock
, ua_ctx
->obj
);
122 * Delete ust app event safely. RCU read lock must be held before calling
126 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
128 free(ua_event
->filter
);
130 if (ua_event
->obj
!= NULL
) {
131 ustctl_release_object(sock
, ua_event
->obj
);
138 * Delete ust app stream safely. RCU read lock must be held before calling
142 void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
145 ustctl_release_object(sock
, stream
->obj
);
146 lttng_fd_put(LTTNG_FD_APPS
, 2);
153 * Delete ust app channel safely. RCU read lock must be held before calling
157 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
160 struct lttng_ht_iter iter
;
161 struct ust_app_event
*ua_event
;
162 struct ust_app_ctx
*ua_ctx
;
163 struct ltt_ust_stream
*stream
, *stmp
;
166 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
167 cds_list_del(&stream
->list
);
168 delete_ust_app_stream(sock
, stream
);
172 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
173 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
175 delete_ust_app_ctx(sock
, ua_ctx
);
177 lttng_ht_destroy(ua_chan
->ctx
);
180 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
182 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
184 delete_ust_app_event(sock
, ua_event
);
186 lttng_ht_destroy(ua_chan
->events
);
188 if (ua_chan
->obj
!= NULL
) {
189 ustctl_release_object(sock
, ua_chan
->obj
);
190 lttng_fd_put(LTTNG_FD_APPS
, 2);
197 * Delete ust app session safely. RCU read lock must be held before calling
201 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
)
204 struct lttng_ht_iter iter
;
205 struct ust_app_channel
*ua_chan
;
207 if (ua_sess
->metadata
) {
208 if (ua_sess
->metadata
->stream_obj
) {
209 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
210 lttng_fd_put(LTTNG_FD_APPS
, 2);
211 free(ua_sess
->metadata
->stream_obj
);
213 if (ua_sess
->metadata
->obj
) {
214 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
215 lttng_fd_put(LTTNG_FD_APPS
, 2);
216 free(ua_sess
->metadata
->obj
);
218 trace_ust_destroy_metadata(ua_sess
->metadata
);
221 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
223 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
225 delete_ust_app_channel(sock
, ua_chan
);
227 lttng_ht_destroy(ua_sess
->channels
);
229 if (ua_sess
->handle
!= -1) {
230 ustctl_release_handle(sock
, ua_sess
->handle
);
236 * Delete a traceable application structure from the global list. Never call
237 * this function outside of a call_rcu call.
240 void delete_ust_app(struct ust_app
*app
)
243 struct lttng_ht_iter iter
;
244 struct ust_app_session
*ua_sess
;
248 /* Delete ust app sessions info */
253 cds_lfht_for_each_entry(app
->sessions
->ht
, &iter
.iter
, ua_sess
,
255 ret
= lttng_ht_del(app
->sessions
, &iter
);
257 delete_ust_app_session(app
->sock
, ua_sess
);
259 lttng_ht_destroy(app
->sessions
);
262 * Wait until we have deleted the application from the sock hash table
263 * before closing this socket, otherwise an application could re-use the
264 * socket ID and race with the teardown, using the same hash table entry.
266 * It's OK to leave the close in call_rcu. We want it to stay unique for
267 * all RCU readers that could run concurrently with unregister app,
268 * therefore we _need_ to only close that socket after a grace period. So
269 * it should stay in this RCU callback.
271 * This close() is a very important step of the synchronization model so
272 * every modification to this function must be carefully reviewed.
278 lttng_fd_put(LTTNG_FD_APPS
, 1);
280 DBG2("UST app pid %d deleted", app
->pid
);
287 * URCU intermediate call to delete an UST app.
290 void delete_ust_app_rcu(struct rcu_head
*head
)
292 struct lttng_ht_node_ulong
*node
=
293 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
294 struct ust_app
*app
=
295 caa_container_of(node
, struct ust_app
, pid_n
);
297 DBG3("Call RCU deleting app PID %d", app
->pid
);
302 * Alloc new UST app session.
305 struct ust_app_session
*alloc_ust_app_session(void)
307 struct ust_app_session
*ua_sess
;
309 /* Init most of the default value by allocating and zeroing */
310 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
311 if (ua_sess
== NULL
) {
316 ua_sess
->handle
= -1;
317 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
326 * Alloc new UST app channel.
329 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
330 struct lttng_ust_channel
*attr
)
332 struct ust_app_channel
*ua_chan
;
334 /* Init most of the default value by allocating and zeroing */
335 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
336 if (ua_chan
== NULL
) {
341 /* Setup channel name */
342 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
343 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
345 ua_chan
->enabled
= 1;
346 ua_chan
->handle
= -1;
347 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
348 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
349 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
351 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
353 /* Copy attributes */
355 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
358 DBG3("UST app channel %s allocated", ua_chan
->name
);
367 * Alloc new UST app event.
370 struct ust_app_event
*alloc_ust_app_event(char *name
,
371 struct lttng_ust_event
*attr
)
373 struct ust_app_event
*ua_event
;
375 /* Init most of the default value by allocating and zeroing */
376 ua_event
= zmalloc(sizeof(struct ust_app_event
));
377 if (ua_event
== NULL
) {
382 ua_event
->enabled
= 1;
383 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
384 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
385 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
387 /* Copy attributes */
389 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
392 DBG3("UST app event %s allocated", ua_event
->name
);
401 * Alloc new UST app context.
404 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
406 struct ust_app_ctx
*ua_ctx
;
408 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
409 if (ua_ctx
== NULL
) {
414 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
417 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
424 * Find an ust_app using the sock and return it. RCU read side lock must be
425 * held before calling this helper function.
428 struct ust_app
*find_app_by_sock(int sock
)
430 struct lttng_ht_node_ulong
*node
;
431 struct lttng_ht_iter iter
;
433 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
434 node
= lttng_ht_iter_get_node_ulong(&iter
);
436 DBG2("UST app find by sock %d not found", sock
);
440 return caa_container_of(node
, struct ust_app
, sock_n
);
446 static struct ust_app_event
*find_ust_app_event(struct lttng_ht
*ht
,
447 char *name
, struct lttng_ust_filter_bytecode
*filter
, int loglevel
)
449 struct lttng_ht_iter iter
;
450 struct lttng_ht_node_str
*node
;
451 struct ust_app_event
*event
= NULL
;
452 struct ust_app_ht_key key
;
453 void *orig_match_fct
;
458 /* Setup key for event lookup. */
461 key
.loglevel
= loglevel
;
463 /* Save match function so we can use the ust app event match. */
464 orig_match_fct
= (void *) ht
->match_fct
;
465 ht
->match_fct
= ht_match_ust_app_event
;
467 lttng_ht_lookup(ht
, (void *) &key
, &iter
);
468 node
= lttng_ht_iter_get_node_str(&iter
);
473 event
= caa_container_of(node
, struct ust_app_event
, node
);
476 /* Put back original match function. */
477 ht
->match_fct
= orig_match_fct
;
482 * Create the channel context on the tracer.
485 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
486 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
490 health_code_update(&health_thread_cmd
);
492 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
493 ua_chan
->obj
, &ua_ctx
->obj
);
498 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
500 DBG2("UST app context created successfully for channel %s", ua_chan
->name
);
503 health_code_update(&health_thread_cmd
);
508 * Set the filter on the tracer.
511 int set_ust_event_filter(struct ust_app_event
*ua_event
,
516 health_code_update(&health_thread_cmd
);
518 if (!ua_event
->filter
) {
523 ret
= ustctl_set_filter(app
->sock
, ua_event
->filter
,
529 DBG2("UST filter set successfully for event %s", ua_event
->name
);
532 health_code_update(&health_thread_cmd
);
537 * Disable the specified event on to UST tracer for the UST session.
539 static int disable_ust_event(struct ust_app
*app
,
540 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
544 health_code_update(&health_thread_cmd
);
546 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
548 ERR("UST app event %s disable failed for app (pid: %d) "
549 "and session handle %d with ret %d",
550 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
554 DBG2("UST app event %s disabled successfully for app (pid: %d)",
555 ua_event
->attr
.name
, app
->pid
);
558 health_code_update(&health_thread_cmd
);
563 * Disable the specified channel on to UST tracer for the UST session.
565 static int disable_ust_channel(struct ust_app
*app
,
566 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
570 health_code_update(&health_thread_cmd
);
572 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
574 ERR("UST app channel %s disable failed for app (pid: %d) "
575 "and session handle %d with ret %d",
576 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
580 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
581 ua_chan
->name
, app
->pid
);
584 health_code_update(&health_thread_cmd
);
589 * Enable the specified channel on to UST tracer for the UST session.
591 static int enable_ust_channel(struct ust_app
*app
,
592 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
596 health_code_update(&health_thread_cmd
);
598 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
600 ERR("UST app channel %s enable failed for app (pid: %d) "
601 "and session handle %d with ret %d",
602 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
606 ua_chan
->enabled
= 1;
608 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
609 ua_chan
->name
, app
->pid
);
612 health_code_update(&health_thread_cmd
);
617 * Enable the specified event on to UST tracer for the UST session.
619 static int enable_ust_event(struct ust_app
*app
,
620 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
624 health_code_update(&health_thread_cmd
);
626 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
628 ERR("UST app event %s enable failed for app (pid: %d) "
629 "and session handle %d with ret %d",
630 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
634 DBG2("UST app event %s enabled successfully for app (pid: %d)",
635 ua_event
->attr
.name
, app
->pid
);
638 health_code_update(&health_thread_cmd
);
643 * Open metadata onto the UST tracer for a UST session.
645 static int open_ust_metadata(struct ust_app
*app
,
646 struct ust_app_session
*ua_sess
)
649 struct lttng_ust_channel_attr uattr
;
651 health_code_update(&health_thread_cmd
);
653 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
654 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
655 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
656 uattr
.switch_timer_interval
=
657 ua_sess
->metadata
->attr
.switch_timer_interval
;
658 uattr
.read_timer_interval
=
659 ua_sess
->metadata
->attr
.read_timer_interval
;
660 uattr
.output
= ua_sess
->metadata
->attr
.output
;
662 /* We are going to receive 2 fds, we need to reserve them. */
663 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
665 ERR("Exhausted number of available FD upon metadata open");
668 /* UST tracer metadata creation */
669 ret
= ustctl_open_metadata(app
->sock
, ua_sess
->handle
, &uattr
,
670 &ua_sess
->metadata
->obj
);
672 ERR("UST app open metadata failed for app pid:%d with ret %d",
677 ua_sess
->metadata
->handle
= ua_sess
->metadata
->obj
->handle
;
680 health_code_update(&health_thread_cmd
);
685 * Create stream onto the UST tracer for a UST session.
687 static int create_ust_stream(struct ust_app
*app
,
688 struct ust_app_session
*ua_sess
)
692 health_code_update(&health_thread_cmd
);
694 /* We are going to receive 2 fds, we need to reserve them. */
695 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
697 ERR("Exhausted number of available FD upon metadata stream create");
700 ret
= ustctl_create_stream(app
->sock
, ua_sess
->metadata
->obj
,
701 &ua_sess
->metadata
->stream_obj
);
703 ERR("UST create metadata stream failed");
708 health_code_update(&health_thread_cmd
);
713 * Create the specified channel onto the UST tracer for a UST session.
715 static int create_ust_channel(struct ust_app
*app
,
716 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
720 health_code_update(&health_thread_cmd
);
722 /* TODO: remove cast and use lttng-ust-abi.h */
724 /* We are going to receive 2 fds, we need to reserve them. */
725 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
727 ERR("Exhausted number of available FD upon create channel");
731 health_code_update(&health_thread_cmd
);
733 ret
= ustctl_create_channel(app
->sock
, ua_sess
->handle
,
734 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
736 ERR("Creating channel %s for app (pid: %d, sock: %d) "
737 "and session handle %d with ret %d",
738 ua_chan
->name
, app
->pid
, app
->sock
,
739 ua_sess
->handle
, ret
);
740 lttng_fd_put(LTTNG_FD_APPS
, 2);
744 ua_chan
->handle
= ua_chan
->obj
->handle
;
746 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
747 ua_chan
->name
, app
->pid
, app
->sock
);
749 health_code_update(&health_thread_cmd
);
751 /* If channel is not enabled, disable it on the tracer */
752 if (!ua_chan
->enabled
) {
753 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
760 health_code_update(&health_thread_cmd
);
765 * Create the specified event onto the UST tracer for a UST session.
768 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
769 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
773 health_code_update(&health_thread_cmd
);
775 /* Create UST event on tracer */
776 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
779 ERR("Error ustctl create event %s for app pid: %d with ret %d",
780 ua_event
->attr
.name
, app
->pid
, ret
);
784 ua_event
->handle
= ua_event
->obj
->handle
;
786 DBG2("UST app event %s created successfully for pid:%d",
787 ua_event
->attr
.name
, app
->pid
);
789 health_code_update(&health_thread_cmd
);
791 /* If event not enabled, disable it on the tracer */
792 if (ua_event
->enabled
== 0) {
793 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
796 * If we hit an EPERM, something is wrong with our disable call. If
797 * we get an EEXIST, there is a problem on the tracer side since we
801 case -LTTNG_UST_ERR_PERM
:
802 /* Code flow problem */
804 case -LTTNG_UST_ERR_EXIST
:
805 /* It's OK for our use case. */
816 health_code_update(&health_thread_cmd
);
821 * Copy data between an UST app event and a LTT event.
823 static void shadow_copy_event(struct ust_app_event
*ua_event
,
824 struct ltt_ust_event
*uevent
)
826 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
827 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
829 ua_event
->enabled
= uevent
->enabled
;
831 /* Copy event attributes */
832 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
834 /* Copy filter bytecode */
835 if (uevent
->filter
) {
836 ua_event
->filter
= zmalloc(sizeof(*ua_event
->filter
) +
837 uevent
->filter
->len
);
838 if (!ua_event
->filter
) {
841 memcpy(ua_event
->filter
, uevent
->filter
,
842 sizeof(*ua_event
->filter
) + uevent
->filter
->len
);
847 * Copy data between an UST app channel and a LTT channel.
849 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
850 struct ltt_ust_channel
*uchan
)
852 struct lttng_ht_iter iter
;
853 struct ltt_ust_event
*uevent
;
854 struct ltt_ust_context
*uctx
;
855 struct ust_app_event
*ua_event
;
856 struct ust_app_ctx
*ua_ctx
;
858 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
860 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
861 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
862 /* Copy event attributes */
863 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
865 ua_chan
->enabled
= uchan
->enabled
;
867 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
868 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
869 if (ua_ctx
== NULL
) {
872 lttng_ht_node_init_ulong(&ua_ctx
->node
,
873 (unsigned long) ua_ctx
->ctx
.ctx
);
874 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
877 /* Copy all events from ltt ust channel to ust app channel */
878 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
879 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
880 uevent
->filter
, uevent
->attr
.loglevel
);
881 if (ua_event
== NULL
) {
882 DBG2("UST event %s not found on shadow copy channel",
884 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
885 if (ua_event
== NULL
) {
888 shadow_copy_event(ua_event
, uevent
);
889 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
893 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
897 * Copy data between a UST app session and a regular LTT session.
899 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
900 struct ltt_ust_session
*usess
, struct ust_app
*app
)
902 struct lttng_ht_node_str
*ua_chan_node
;
903 struct lttng_ht_iter iter
;
904 struct ltt_ust_channel
*uchan
;
905 struct ust_app_channel
*ua_chan
;
911 /* Get date and time for unique app path */
913 timeinfo
= localtime(&rawtime
);
914 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
916 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
918 ua_sess
->id
= usess
->id
;
919 ua_sess
->uid
= usess
->uid
;
920 ua_sess
->gid
= usess
->gid
;
922 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s-%d-%s/", app
->name
, app
->pid
,
925 PERROR("asprintf UST shadow copy session");
926 /* TODO: We cannot return an error from here.. */
930 /* TODO: support all UST domain */
932 /* Iterate over all channels in global domain. */
933 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
935 struct lttng_ht_iter uiter
;
937 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
938 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
939 if (ua_chan_node
!= NULL
) {
940 /* Session exist. Contiuing. */
944 DBG2("Channel %s not found on shadow session copy, creating it",
946 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
947 if (ua_chan
== NULL
) {
948 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
952 shadow_copy_channel(ua_chan
, uchan
);
953 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
958 * Lookup sesison wrapper.
961 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
962 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
964 /* Get right UST app session from app */
965 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
969 * Return ust app session from the app session hashtable using the UST session
972 static struct ust_app_session
*lookup_session_by_app(
973 struct ltt_ust_session
*usess
, struct ust_app
*app
)
975 struct lttng_ht_iter iter
;
976 struct lttng_ht_node_ulong
*node
;
978 __lookup_session_by_app(usess
, app
, &iter
);
979 node
= lttng_ht_iter_get_node_ulong(&iter
);
984 return caa_container_of(node
, struct ust_app_session
, node
);
991 * Create a UST session onto the tracer of app and add it the session
994 * Return ust app session or NULL on error.
996 static struct ust_app_session
*create_ust_app_session(
997 struct ltt_ust_session
*usess
, struct ust_app
*app
)
1000 struct ust_app_session
*ua_sess
;
1002 health_code_update(&health_thread_cmd
);
1004 ua_sess
= lookup_session_by_app(usess
, app
);
1005 if (ua_sess
== NULL
) {
1006 DBG2("UST app pid: %d session id %d not found, creating it",
1007 app
->pid
, usess
->id
);
1008 ua_sess
= alloc_ust_app_session();
1009 if (ua_sess
== NULL
) {
1010 /* Only malloc can failed so something is really wrong */
1013 shadow_copy_session(ua_sess
, usess
, app
);
1016 health_code_update(&health_thread_cmd
);
1018 if (ua_sess
->handle
== -1) {
1019 ret
= ustctl_create_session(app
->sock
);
1021 ERR("Creating session for app pid %d", app
->pid
);
1022 delete_ust_app_session(-1, ua_sess
);
1023 /* This means that the tracer is gone... */
1024 ua_sess
= (void*) -1UL;
1028 ua_sess
->handle
= ret
;
1030 /* Add ust app session to app's HT */
1031 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
1032 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
1034 DBG2("UST app session created successfully with handle %d", ret
);
1038 health_code_update(&health_thread_cmd
);
1043 * Create a context for the channel on the tracer.
1046 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
1047 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
1048 struct ust_app
*app
)
1051 struct lttng_ht_iter iter
;
1052 struct lttng_ht_node_ulong
*node
;
1053 struct ust_app_ctx
*ua_ctx
;
1055 DBG2("UST app adding context to channel %s", ua_chan
->name
);
1057 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
1058 node
= lttng_ht_iter_get_node_ulong(&iter
);
1064 ua_ctx
= alloc_ust_app_ctx(uctx
);
1065 if (ua_ctx
== NULL
) {
1071 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
1072 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
1074 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
1084 * Set UST filter for the event on the tracer.
1087 int set_ust_app_event_filter(struct ust_app_session
*ua_sess
,
1088 struct ust_app_event
*ua_event
,
1089 struct lttng_filter_bytecode
*bytecode
,
1090 struct ust_app
*app
)
1094 DBG2("UST app adding context to event %s", ua_event
->name
);
1096 /* Copy filter bytecode */
1097 ua_event
->filter
= zmalloc(sizeof(*ua_event
->filter
) + bytecode
->len
);
1098 if (!ua_event
->filter
) {
1101 memcpy(ua_event
->filter
, bytecode
,
1102 sizeof(*ua_event
->filter
) + bytecode
->len
);
1103 ret
= set_ust_event_filter(ua_event
, app
);
1113 * Enable on the tracer side a ust app event for the session and channel.
1116 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
1117 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1121 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1126 ua_event
->enabled
= 1;
1133 * Disable on the tracer side a ust app event for the session and channel.
1135 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
1136 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1140 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1145 ua_event
->enabled
= 0;
1152 * Lookup ust app channel for session and disable it on the tracer side.
1155 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1156 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1160 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1165 ua_chan
->enabled
= 0;
1172 * Lookup ust app channel for session and enable it on the tracer side.
1174 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1175 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1178 struct lttng_ht_iter iter
;
1179 struct lttng_ht_node_str
*ua_chan_node
;
1180 struct ust_app_channel
*ua_chan
;
1182 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1183 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1184 if (ua_chan_node
== NULL
) {
1185 DBG2("Unable to find channel %s in ust session id %u",
1186 uchan
->name
, ua_sess
->id
);
1190 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1192 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1202 * Create UST app channel and create it on the tracer.
1204 static struct ust_app_channel
*create_ust_app_channel(
1205 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
1206 struct ust_app
*app
)
1209 struct lttng_ht_iter iter
;
1210 struct lttng_ht_node_str
*ua_chan_node
;
1211 struct ust_app_channel
*ua_chan
;
1213 /* Lookup channel in the ust app session */
1214 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1215 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1216 if (ua_chan_node
!= NULL
) {
1217 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1221 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1222 if (ua_chan
== NULL
) {
1223 /* Only malloc can fail here */
1226 shadow_copy_channel(ua_chan
, uchan
);
1228 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1230 /* Not found previously means that it does not exist on the tracer */
1231 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1235 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1237 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1244 delete_ust_app_channel(-1, ua_chan
);
1249 * Create UST app event and create it on the tracer side.
1252 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1253 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1254 struct ust_app
*app
)
1257 struct ust_app_event
*ua_event
;
1259 /* Get event node */
1260 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
1261 uevent
->filter
, uevent
->attr
.loglevel
);
1262 if (ua_event
!= NULL
) {
1267 /* Does not exist so create one */
1268 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1269 if (ua_event
== NULL
) {
1270 /* Only malloc can failed so something is really wrong */
1274 shadow_copy_event(ua_event
, uevent
);
1276 /* Create it on the tracer side */
1277 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1279 /* Not found previously means that it does not exist on the tracer */
1280 assert(ret
!= -LTTNG_UST_ERR_EXIST
);
1284 add_unique_ust_app_event(ua_chan
->events
, ua_event
);
1286 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1293 /* Valid. Calling here is already in a read side lock */
1294 delete_ust_app_event(-1, ua_event
);
1299 * Create UST metadata and open it on the tracer side.
1301 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1302 char *pathname
, struct ust_app
*app
)
1306 if (ua_sess
->metadata
== NULL
) {
1307 /* Allocate UST metadata */
1308 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1309 if (ua_sess
->metadata
== NULL
) {
1310 /* malloc() failed */
1314 ret
= open_ust_metadata(app
, ua_sess
);
1316 DBG3("Opening metadata failed. Cleaning up memory");
1318 /* Cleanup failed metadata struct */
1319 free(ua_sess
->metadata
);
1321 * This is very important because delete_ust_app_session check if
1322 * the pointer is null or not in order to delete the metadata.
1324 ua_sess
->metadata
= NULL
;
1328 DBG2("UST metadata opened for app pid %d", app
->pid
);
1331 /* Open UST metadata stream */
1332 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1333 ret
= create_ust_stream(app
, ua_sess
);
1338 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1339 "%s/metadata", ua_sess
->path
);
1341 PERROR("asprintf UST create stream");
1345 DBG2("UST metadata stream object created for app pid %d",
1348 ERR("Attempting to create stream without metadata opened");
1359 * Return pointer to traceable apps list.
1361 struct lttng_ht
*ust_app_get_ht(void)
1367 * Return ust app pointer or NULL if not found.
1369 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1371 struct lttng_ht_node_ulong
*node
;
1372 struct lttng_ht_iter iter
;
1375 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1376 node
= lttng_ht_iter_get_node_ulong(&iter
);
1378 DBG2("UST app no found with pid %d", pid
);
1383 DBG2("Found UST app by pid %d", pid
);
1385 return caa_container_of(node
, struct ust_app
, pid_n
);
1393 * Using pid and uid (of the app), allocate a new ust_app struct and
1394 * add it to the global traceable app list.
1396 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1397 * bitness is not supported.
1399 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1401 struct ust_app
*lta
;
1404 if ((msg
->bits_per_long
== 64 &&
1405 (uatomic_read(&ust_consumerd64_fd
) == -EINVAL
))
1406 || (msg
->bits_per_long
== 32 &&
1407 (uatomic_read(&ust_consumerd32_fd
) == -EINVAL
))) {
1408 ERR("Registration failed: application \"%s\" (pid: %d) has "
1409 "%d-bit long, but no consumerd for this long size is available.\n",
1410 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1415 lttng_fd_put(LTTNG_FD_APPS
, 1);
1418 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1419 ERR("Registration failed: application \"%s\" (pid: %d) has "
1420 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1421 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1426 lttng_fd_put(LTTNG_FD_APPS
, 1);
1429 lta
= zmalloc(sizeof(struct ust_app
));
1435 lta
->ppid
= msg
->ppid
;
1436 lta
->uid
= msg
->uid
;
1437 lta
->gid
= msg
->gid
;
1438 lta
->compatible
= 0; /* Not compatible until proven */
1439 lta
->bits_per_long
= msg
->bits_per_long
;
1440 lta
->v_major
= msg
->major
;
1441 lta
->v_minor
= msg
->minor
;
1442 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1443 lta
->name
[16] = '\0';
1444 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1446 lta
->pid
= msg
->pid
;
1447 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1449 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1454 * On a re-registration, we want to kick out the previous registration of
1457 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1460 * The socket _should_ be unique until _we_ call close. So, a add_unique
1461 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1462 * already in the table.
1464 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1468 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1469 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1470 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1476 * Unregister app by removing it from the global traceable app list and freeing
1479 * The socket is already closed at this point so no close to sock.
1481 void ust_app_unregister(int sock
)
1483 struct ust_app
*lta
;
1484 struct lttng_ht_node_ulong
*node
;
1485 struct lttng_ht_iter iter
;
1490 /* Get the node reference for a call_rcu */
1491 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1492 node
= lttng_ht_iter_get_node_ulong(&iter
);
1494 ERR("Unable to find app by sock %d", sock
);
1498 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1500 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1502 /* Remove application from PID hash table */
1503 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1506 /* Assign second node for deletion */
1507 iter
.iter
.node
= <a
->pid_n
.node
;
1510 * Ignore return value since the node might have been removed before by an
1511 * add replace during app registration because the PID can be reassigned by
1514 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1516 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1521 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1529 * Return traceable_app_count
1531 unsigned long ust_app_list_count(void)
1533 unsigned long count
;
1536 count
= lttng_ht_get_count(ust_app_ht
);
1543 * Fill events array with all events name of all registered apps.
1545 int ust_app_list_events(struct lttng_event
**events
)
1548 size_t nbmem
, count
= 0;
1549 struct lttng_ht_iter iter
;
1550 struct ust_app
*app
;
1551 struct lttng_event
*tmp
;
1553 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1554 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1556 PERROR("zmalloc ust app events");
1563 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1564 struct lttng_ust_tracepoint_iter uiter
;
1566 health_code_update(&health_thread_cmd
);
1568 if (!app
->compatible
) {
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1575 handle
= ustctl_tracepoint_list(app
->sock
);
1577 ERR("UST app list events getting handle failed for app pid %d",
1582 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
1583 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1584 health_code_update(&health_thread_cmd
);
1585 if (count
>= nbmem
) {
1586 /* In case the realloc fails, we free the memory */
1587 void *tmp_ptr
= (void *) tmp
;
1588 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1591 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event
));
1593 PERROR("realloc ust app events");
1599 memcpy(tmp
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1600 tmp
[count
].loglevel
= uiter
.loglevel
;
1601 tmp
[count
].type
= (enum lttng_event_type
) LTTNG_UST_TRACEPOINT
;
1602 tmp
[count
].pid
= app
->pid
;
1603 tmp
[count
].enabled
= -1;
1611 DBG2("UST app list events done (%zu events)", count
);
1616 health_code_update(&health_thread_cmd
);
1621 * Fill events array with all events name of all registered apps.
1623 int ust_app_list_event_fields(struct lttng_event_field
**fields
)
1626 size_t nbmem
, count
= 0;
1627 struct lttng_ht_iter iter
;
1628 struct ust_app
*app
;
1629 struct lttng_event_field
*tmp
;
1631 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1632 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event_field
));
1634 PERROR("zmalloc ust app event fields");
1641 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1642 struct lttng_ust_field_iter uiter
;
1644 health_code_update(&health_thread_cmd
);
1646 if (!app
->compatible
) {
1648 * TODO: In time, we should notice the caller of this error by
1649 * telling him that this is a version error.
1653 handle
= ustctl_tracepoint_field_list(app
->sock
);
1655 ERR("UST app list event fields getting handle failed for app pid %d",
1660 while ((ret
= ustctl_tracepoint_field_list_get(app
->sock
, handle
,
1661 &uiter
)) != -LTTNG_UST_ERR_NOENT
) {
1662 health_code_update(&health_thread_cmd
);
1663 if (count
>= nbmem
) {
1664 /* In case the realloc fails, we free the memory */
1665 void *tmp_ptr
= (void *) tmp
;
1666 DBG2("Reallocating event field list from %zu to %zu entries", nbmem
,
1669 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event_field
));
1671 PERROR("realloc ust app event fields");
1678 memcpy(tmp
[count
].field_name
, uiter
.field_name
, LTTNG_UST_SYM_NAME_LEN
);
1679 tmp
[count
].type
= uiter
.type
;
1680 tmp
[count
].nowrite
= uiter
.nowrite
;
1682 memcpy(tmp
[count
].event
.name
, uiter
.event_name
, LTTNG_UST_SYM_NAME_LEN
);
1683 tmp
[count
].event
.loglevel
= uiter
.loglevel
;
1684 tmp
[count
].event
.type
= LTTNG_UST_TRACEPOINT
;
1685 tmp
[count
].event
.pid
= app
->pid
;
1686 tmp
[count
].event
.enabled
= -1;
1694 DBG2("UST app list event fields done (%zu events)", count
);
1699 health_code_update(&health_thread_cmd
);
1704 * Free and clean all traceable apps of the global list.
1706 void ust_app_clean_list(void)
1709 struct ust_app
*app
;
1710 struct lttng_ht_iter iter
;
1712 DBG2("UST app cleaning registered apps hash table");
1716 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1717 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1719 call_rcu(&app
->pid_n
.head
, delete_ust_app_rcu
);
1722 /* Cleanup socket hash table */
1723 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, app
,
1725 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1729 /* Destroy is done only when the ht is empty */
1730 lttng_ht_destroy(ust_app_ht
);
1731 lttng_ht_destroy(ust_app_ht_by_sock
);
1737 * Init UST app hash table.
1739 void ust_app_ht_alloc(void)
1741 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1742 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1746 * For a specific UST session, disable the channel for all registered apps.
1748 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1749 struct ltt_ust_channel
*uchan
)
1752 struct lttng_ht_iter iter
;
1753 struct lttng_ht_node_str
*ua_chan_node
;
1754 struct ust_app
*app
;
1755 struct ust_app_session
*ua_sess
;
1756 struct ust_app_channel
*ua_chan
;
1758 if (usess
== NULL
|| uchan
== NULL
) {
1759 ERR("Disabling UST global channel with NULL values");
1764 DBG2("UST app disabling channel %s from global domain for session id %d",
1765 uchan
->name
, usess
->id
);
1769 /* For every registered applications */
1770 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1771 struct lttng_ht_iter uiter
;
1772 if (!app
->compatible
) {
1774 * TODO: In time, we should notice the caller of this error by
1775 * telling him that this is a version error.
1779 ua_sess
= lookup_session_by_app(usess
, app
);
1780 if (ua_sess
== NULL
) {
1785 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1786 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1787 /* If the session if found for the app, the channel must be there */
1788 assert(ua_chan_node
);
1790 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1791 /* The channel must not be already disabled */
1792 assert(ua_chan
->enabled
== 1);
1794 /* Disable channel onto application */
1795 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1797 /* XXX: We might want to report this error at some point... */
1809 * For a specific UST session, enable the channel for all registered apps.
1811 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1812 struct ltt_ust_channel
*uchan
)
1815 struct lttng_ht_iter iter
;
1816 struct ust_app
*app
;
1817 struct ust_app_session
*ua_sess
;
1819 if (usess
== NULL
|| uchan
== NULL
) {
1820 ERR("Adding UST global channel to NULL values");
1825 DBG2("UST app enabling channel %s to global domain for session id %d",
1826 uchan
->name
, usess
->id
);
1830 /* For every registered applications */
1831 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1832 if (!app
->compatible
) {
1834 * TODO: In time, we should notice the caller of this error by
1835 * telling him that this is a version error.
1839 ua_sess
= lookup_session_by_app(usess
, app
);
1840 if (ua_sess
== NULL
) {
1844 /* Enable channel onto application */
1845 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1847 /* XXX: We might want to report this error at some point... */
1859 * Disable an event in a channel and for a specific session.
1861 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1862 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1865 struct lttng_ht_iter iter
, uiter
;
1866 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1867 struct ust_app
*app
;
1868 struct ust_app_session
*ua_sess
;
1869 struct ust_app_channel
*ua_chan
;
1870 struct ust_app_event
*ua_event
;
1872 DBG("UST app disabling event %s for all apps in channel "
1873 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1877 /* For all registered applications */
1878 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1879 if (!app
->compatible
) {
1881 * TODO: In time, we should notice the caller of this error by
1882 * telling him that this is a version error.
1886 ua_sess
= lookup_session_by_app(usess
, app
);
1887 if (ua_sess
== NULL
) {
1892 /* Lookup channel in the ust app session */
1893 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1894 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1895 if (ua_chan_node
== NULL
) {
1896 DBG2("Channel %s not found in session id %d for app pid %d."
1897 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
1900 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1902 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
1903 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1904 if (ua_event_node
== NULL
) {
1905 DBG2("Event %s not found in channel %s for app pid %d."
1906 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
1909 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1911 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1913 /* XXX: Report error someday... */
1924 * For a specific UST session and UST channel, the event for all
1927 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
1928 struct ltt_ust_channel
*uchan
)
1931 struct lttng_ht_iter iter
, uiter
;
1932 struct lttng_ht_node_str
*ua_chan_node
;
1933 struct ust_app
*app
;
1934 struct ust_app_session
*ua_sess
;
1935 struct ust_app_channel
*ua_chan
;
1936 struct ust_app_event
*ua_event
;
1938 DBG("UST app disabling all event for all apps in channel "
1939 "%s for session id %d", uchan
->name
, usess
->id
);
1943 /* For all registered applications */
1944 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1945 if (!app
->compatible
) {
1947 * TODO: In time, we should notice the caller of this error by
1948 * telling him that this is a version error.
1952 ua_sess
= lookup_session_by_app(usess
, app
);
1953 /* If ua_sess is NULL, there is a code flow error */
1956 /* Lookup channel in the ust app session */
1957 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1958 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1959 /* If the channel is not found, there is a code flow error */
1960 assert(ua_chan_node
);
1962 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1964 /* Disable each events of channel */
1965 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
1967 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1969 /* XXX: Report error someday... */
1981 * For a specific UST session, create the channel for all registered apps.
1983 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
1984 struct ltt_ust_channel
*uchan
)
1987 struct lttng_ht_iter iter
;
1988 struct ust_app
*app
;
1989 struct ust_app_session
*ua_sess
;
1990 struct ust_app_channel
*ua_chan
;
1992 /* Very wrong code flow */
1996 DBG2("UST app adding channel %s to global domain for session id %d",
1997 uchan
->name
, usess
->id
);
2001 /* For every registered applications */
2002 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2003 if (!app
->compatible
) {
2005 * TODO: In time, we should notice the caller of this error by
2006 * telling him that this is a version error.
2011 * Create session on the tracer side and add it to app session HT. Note
2012 * that if session exist, it will simply return a pointer to the ust
2015 ua_sess
= create_ust_app_session(usess
, app
);
2016 if (ua_sess
== NULL
) {
2017 /* The malloc() failed. */
2020 } else if (ua_sess
== (void *) -1UL) {
2021 /* The application's socket is not valid. Contiuing */
2026 /* Create channel onto application */
2027 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
2028 if (ua_chan
== NULL
) {
2029 /* Major problem here and it's maybe the tracer or malloc() */
2042 * Enable event for a specific session and channel on the tracer.
2044 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
2045 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2048 struct lttng_ht_iter iter
, uiter
;
2049 struct lttng_ht_node_str
*ua_chan_node
;
2050 struct ust_app
*app
;
2051 struct ust_app_session
*ua_sess
;
2052 struct ust_app_channel
*ua_chan
;
2053 struct ust_app_event
*ua_event
;
2055 DBG("UST app enabling event %s for all apps for session id %d",
2056 uevent
->attr
.name
, usess
->id
);
2059 * NOTE: At this point, this function is called only if the session and
2060 * channel passed are already created for all apps. and enabled on the
2066 /* For all registered applications */
2067 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2068 if (!app
->compatible
) {
2070 * TODO: In time, we should notice the caller of this error by
2071 * telling him that this is a version error.
2075 ua_sess
= lookup_session_by_app(usess
, app
);
2076 /* If ua_sess is NULL, there is a code flow error */
2079 /* Lookup channel in the ust app session */
2080 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2081 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2082 /* If the channel is not found, there is a code flow error */
2083 assert(ua_chan_node
);
2085 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2087 /* Get event node */
2088 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2089 uevent
->filter
, uevent
->attr
.loglevel
);
2090 if (ua_event
== NULL
) {
2091 DBG3("UST app enable event %s not found for app PID %d."
2092 "Skipping app", uevent
->attr
.name
, app
->pid
);
2096 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2108 * For a specific existing UST session and UST channel, creates the event for
2109 * all registered apps.
2111 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
2112 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
2115 struct lttng_ht_iter iter
, uiter
;
2116 struct lttng_ht_node_str
*ua_chan_node
;
2117 struct ust_app
*app
;
2118 struct ust_app_session
*ua_sess
;
2119 struct ust_app_channel
*ua_chan
;
2121 DBG("UST app creating event %s for all apps for session id %d",
2122 uevent
->attr
.name
, usess
->id
);
2126 /* For all registered applications */
2127 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2128 if (!app
->compatible
) {
2130 * TODO: In time, we should notice the caller of this error by
2131 * telling him that this is a version error.
2135 ua_sess
= lookup_session_by_app(usess
, app
);
2136 /* If ua_sess is NULL, there is a code flow error */
2139 /* Lookup channel in the ust app session */
2140 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2141 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2142 /* If the channel is not found, there is a code flow error */
2143 assert(ua_chan_node
);
2145 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2147 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2149 if (ret
!= -LTTNG_UST_ERR_EXIST
) {
2150 /* Possible value at this point: -ENOMEM. If so, we stop! */
2153 DBG2("UST app event %s already exist on app PID %d",
2154 uevent
->attr
.name
, app
->pid
);
2165 * Start tracing for a specific UST session and app.
2167 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2170 struct lttng_ht_iter iter
;
2171 struct ust_app_session
*ua_sess
;
2172 struct ust_app_channel
*ua_chan
;
2173 struct ltt_ust_stream
*ustream
;
2174 struct consumer_socket
*socket
;
2176 DBG("Starting tracing for ust app pid %d", app
->pid
);
2180 if (!app
->compatible
) {
2184 ua_sess
= lookup_session_by_app(usess
, app
);
2185 if (ua_sess
== NULL
) {
2186 goto error_rcu_unlock
;
2189 /* Upon restart, we skip the setup, already done */
2190 if (ua_sess
->started
) {
2194 /* Create directories if consumer is LOCAL and has a path defined. */
2195 if (usess
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2196 strlen(usess
->consumer
->dst
.trace_path
) > 0) {
2197 ret
= run_as_mkdir_recursive(usess
->consumer
->dst
.trace_path
,
2198 S_IRWXU
| S_IRWXG
, usess
->uid
, usess
->gid
);
2200 if (ret
!= -EEXIST
) {
2201 ERR("Trace directory creation error");
2203 goto error_rcu_unlock
;
2208 /* Indicate that the session has been started once */
2209 ua_sess
->started
= 1;
2211 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
2213 ret
= LTTNG_ERR_UST_META_FAIL
;
2214 goto error_rcu_unlock
;
2217 /* For each channel */
2218 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2220 /* Create all streams */
2222 /* Create UST stream */
2223 ustream
= zmalloc(sizeof(*ustream
));
2224 if (ustream
== NULL
) {
2225 PERROR("zmalloc ust stream");
2226 goto error_rcu_unlock
;
2229 /* We are going to receive 2 fds, we need to reserve them. */
2230 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2232 ERR("Exhausted number of available FD upon stream create");
2234 goto error_rcu_unlock
;
2237 health_code_update(&health_thread_cmd
);
2239 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
,
2242 /* Got all streams */
2243 lttng_fd_put(LTTNG_FD_APPS
, 2);
2245 ret
= LTTNG_ERR_UST_STREAM_FAIL
;
2248 ustream
->handle
= ustream
->obj
->handle
;
2250 health_code_update(&health_thread_cmd
);
2252 /* Order is important */
2253 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2254 ret
= snprintf(ustream
->name
, sizeof(ustream
->name
), "%s_%u",
2255 ua_chan
->name
, ua_chan
->streams
.count
);
2256 ua_chan
->streams
.count
++;
2258 PERROR("asprintf UST create stream");
2260 * XXX what should we do here with the
2265 DBG2("UST stream %d ready (handle: %d)", ua_chan
->streams
.count
,
2269 health_code_update(&health_thread_cmd
);
2272 switch (app
->bits_per_long
) {
2274 socket
= consumer_find_socket(uatomic_read(&ust_consumerd64_fd
),
2276 if (socket
== NULL
) {
2281 socket
= consumer_find_socket(uatomic_read(&ust_consumerd32_fd
),
2283 if (socket
== NULL
) {
2289 goto error_rcu_unlock
;
2292 /* Setup UST consumer socket and send fds to it */
2293 ret
= ust_consumer_send_session(ua_sess
, usess
->consumer
, socket
);
2295 goto error_rcu_unlock
;
2298 health_code_update(&health_thread_cmd
);
2301 /* This start the UST tracing */
2302 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2304 ERR("Error starting tracing for app pid: %d", app
->pid
);
2305 goto error_rcu_unlock
;
2308 health_code_update(&health_thread_cmd
);
2310 /* Quiescent wait after starting trace */
2311 ustctl_wait_quiescent(app
->sock
);
2315 health_code_update(&health_thread_cmd
);
2320 health_code_update(&health_thread_cmd
);
2325 * Stop tracing for a specific UST session and app.
2327 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2330 struct lttng_ht_iter iter
;
2331 struct ust_app_session
*ua_sess
;
2332 struct ust_app_channel
*ua_chan
;
2334 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2338 if (!app
->compatible
) {
2342 ua_sess
= lookup_session_by_app(usess
, app
);
2343 if (ua_sess
== NULL
) {
2344 /* Only malloc can failed so something is really wrong */
2345 goto error_rcu_unlock
;
2349 * If started = 0, it means that stop trace has been called for a session
2350 * that was never started. This is a code flow error and should never
2353 assert(ua_sess
->started
== 1);
2355 health_code_update(&health_thread_cmd
);
2357 /* This inhibits UST tracing */
2358 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2360 ERR("Error stopping tracing for app pid: %d", app
->pid
);
2361 goto error_rcu_unlock
;
2364 health_code_update(&health_thread_cmd
);
2366 /* Quiescent wait after stopping trace */
2367 ustctl_wait_quiescent(app
->sock
);
2369 health_code_update(&health_thread_cmd
);
2371 /* Flushing buffers */
2372 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2374 health_code_update(&health_thread_cmd
);
2375 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2377 ERR("UST app PID %d channel %s flush failed with ret %d",
2378 app
->pid
, ua_chan
->name
, ret
);
2379 /* Continuing flushing all buffers */
2384 health_code_update(&health_thread_cmd
);
2386 /* Flush all buffers before stopping */
2387 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2389 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2395 health_code_update(&health_thread_cmd
);
2400 health_code_update(&health_thread_cmd
);
2405 * Destroy a specific UST session in apps.
2407 int ust_app_destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2409 struct ust_app_session
*ua_sess
;
2410 struct lttng_ust_object_data obj
;
2411 struct lttng_ht_iter iter
;
2412 struct lttng_ht_node_ulong
*node
;
2415 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2419 if (!app
->compatible
) {
2423 __lookup_session_by_app(usess
, app
, &iter
);
2424 node
= lttng_ht_iter_get_node_ulong(&iter
);
2426 /* Only malloc can failed so something is really wrong */
2427 goto error_rcu_unlock
;
2429 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2430 ret
= lttng_ht_del(app
->sessions
, &iter
);
2432 obj
.handle
= ua_sess
->handle
;
2435 obj
.memory_map_size
= 0;
2436 health_code_update(&health_thread_cmd
);
2437 ustctl_release_object(app
->sock
, &obj
);
2439 health_code_update(&health_thread_cmd
);
2440 delete_ust_app_session(app
->sock
, ua_sess
);
2442 /* Quiescent wait after stopping trace */
2443 ustctl_wait_quiescent(app
->sock
);
2447 health_code_update(&health_thread_cmd
);
2452 health_code_update(&health_thread_cmd
);
2457 * Start tracing for the UST session.
2459 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2462 struct lttng_ht_iter iter
;
2463 struct ust_app
*app
;
2465 DBG("Starting all UST traces");
2469 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2470 ret
= ust_app_start_trace(usess
, app
);
2472 /* Continue to next apps even on error */
2483 * Start tracing for the UST session.
2485 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2488 struct lttng_ht_iter iter
;
2489 struct ust_app
*app
;
2491 DBG("Stopping all UST traces");
2495 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2496 ret
= ust_app_stop_trace(usess
, app
);
2498 /* Continue to next apps even on error */
2509 * Destroy app UST session.
2511 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2514 struct lttng_ht_iter iter
;
2515 struct ust_app
*app
;
2517 DBG("Destroy all UST traces");
2521 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2522 ret
= ust_app_destroy_trace(usess
, app
);
2524 /* Continue to next apps even on error */
2535 * Add channels/events from UST global domain to registered apps at sock.
2537 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2540 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2541 struct ust_app
*app
;
2542 struct ust_app_session
*ua_sess
;
2543 struct ust_app_channel
*ua_chan
;
2544 struct ust_app_event
*ua_event
;
2545 struct ust_app_ctx
*ua_ctx
;
2547 if (usess
== NULL
) {
2548 ERR("No UST session on global update. Returning");
2552 DBG2("UST app global update for app sock %d for session id %d", sock
,
2557 app
= find_app_by_sock(sock
);
2559 ERR("Failed to update app sock %d", sock
);
2563 if (!app
->compatible
) {
2567 ua_sess
= create_ust_app_session(usess
, app
);
2568 if (ua_sess
== NULL
|| ua_sess
== (void *) -1UL) {
2569 /* Tracer is gone for this session and has been freed */
2574 * We can iterate safely here over all UST app session sicne the create ust
2575 * app session above made a shadow copy of the UST global domain from the
2578 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2580 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2582 /* FIXME: Should we quit here or continue... */
2586 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2588 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2590 /* FIXME: Should we quit here or continue... */
2596 /* For each events */
2597 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2599 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2601 /* FIXME: Should we quit here or continue... */
2605 ret
= set_ust_event_filter(ua_event
, app
);
2607 /* FIXME: Should we quit here or continue... */
2613 if (usess
->start_trace
) {
2614 ret
= ust_app_start_trace(usess
, app
);
2619 DBG2("UST trace started for app pid %d", app
->pid
);
2628 * Add context to a specific channel for global UST domain.
2630 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2631 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2634 struct lttng_ht_node_str
*ua_chan_node
;
2635 struct lttng_ht_iter iter
, uiter
;
2636 struct ust_app_channel
*ua_chan
= NULL
;
2637 struct ust_app_session
*ua_sess
;
2638 struct ust_app
*app
;
2642 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2643 if (!app
->compatible
) {
2645 * TODO: In time, we should notice the caller of this error by
2646 * telling him that this is a version error.
2650 ua_sess
= lookup_session_by_app(usess
, app
);
2651 if (ua_sess
== NULL
) {
2655 /* Lookup channel in the ust app session */
2656 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2657 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2658 if (ua_chan_node
== NULL
) {
2661 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2664 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2675 * Add context to a specific event in a channel for global UST domain.
2677 int ust_app_set_filter_event_glb(struct ltt_ust_session
*usess
,
2678 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
,
2679 struct lttng_filter_bytecode
*bytecode
)
2682 struct lttng_ht_node_str
*ua_chan_node
;
2683 struct lttng_ht_iter iter
, uiter
;
2684 struct ust_app_session
*ua_sess
;
2685 struct ust_app_event
*ua_event
;
2686 struct ust_app_channel
*ua_chan
= NULL
;
2687 struct ust_app
*app
;
2691 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2692 if (!app
->compatible
) {
2694 * TODO: In time, we should notice the caller of this error by
2695 * telling him that this is a version error.
2699 ua_sess
= lookup_session_by_app(usess
, app
);
2700 if (ua_sess
== NULL
) {
2704 /* Lookup channel in the ust app session */
2705 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2706 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2707 if (ua_chan_node
== NULL
) {
2710 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2713 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2714 (struct lttng_ust_filter_bytecode
*) bytecode
,
2715 uevent
->attr
.loglevel
);
2716 if (ua_event
== NULL
) {
2720 ret
= set_ust_app_event_filter(ua_sess
, ua_event
, bytecode
, app
);
2731 * Enable event for a channel from a UST session for a specific PID.
2733 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2734 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2737 struct lttng_ht_iter iter
;
2738 struct lttng_ht_node_str
*ua_chan_node
;
2739 struct ust_app
*app
;
2740 struct ust_app_session
*ua_sess
;
2741 struct ust_app_channel
*ua_chan
;
2742 struct ust_app_event
*ua_event
;
2744 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2748 app
= ust_app_find_by_pid(pid
);
2750 ERR("UST app enable event per PID %d not found", pid
);
2755 if (!app
->compatible
) {
2760 ua_sess
= lookup_session_by_app(usess
, app
);
2761 /* If ua_sess is NULL, there is a code flow error */
2764 /* Lookup channel in the ust app session */
2765 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2766 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2767 /* If the channel is not found, there is a code flow error */
2768 assert(ua_chan_node
);
2770 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2772 ua_event
= find_ust_app_event(ua_chan
->events
, uevent
->attr
.name
,
2773 uevent
->filter
, uevent
->attr
.loglevel
);
2774 if (ua_event
== NULL
) {
2775 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2780 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2792 * Disable event for a channel from a UST session for a specific PID.
2794 int ust_app_disable_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
, *ua_event_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 disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2809 app
= ust_app_find_by_pid(pid
);
2811 ERR("UST app disable event per PID %d not found", pid
);
2816 if (!app
->compatible
) {
2821 ua_sess
= lookup_session_by_app(usess
, app
);
2822 /* If ua_sess is NULL, there is a code flow error */
2825 /* Lookup channel in the ust app session */
2826 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2827 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2828 if (ua_chan_node
== NULL
) {
2829 /* Channel does not exist, skip disabling */
2832 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2834 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2835 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2836 if (ua_event_node
== NULL
) {
2837 /* Event does not exist, skip disabling */
2840 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2842 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2853 * Validate version of UST apps and set the compatible bit.
2855 int ust_app_validate_version(int sock
)
2858 struct ust_app
*app
;
2862 app
= find_app_by_sock(sock
);
2865 health_code_update(&health_thread_cmd
);
2867 ret
= ustctl_tracer_version(sock
, &app
->version
);
2872 /* Validate version */
2873 if (app
->version
.major
!= UST_APP_MAJOR_VERSION
) {
2877 DBG2("UST app PID %d is compatible with internal major version %d "
2878 "(supporting == %d)", app
->pid
, app
->version
.major
,
2879 UST_APP_MAJOR_VERSION
);
2880 app
->compatible
= 1;
2882 health_code_update(&health_thread_cmd
);
2886 DBG2("UST app PID %d is not compatible with internal major version %d "
2887 "(supporting == %d)", app
->pid
, app
->version
.major
,
2888 UST_APP_MAJOR_VERSION
);
2889 app
->compatible
= 0;
2891 health_code_update(&health_thread_cmd
);
2896 * Calibrate registered applications.
2898 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2901 struct lttng_ht_iter iter
;
2902 struct ust_app
*app
;
2906 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2907 if (!app
->compatible
) {
2909 * TODO: In time, we should notice the caller of this error by
2910 * telling him that this is a version error.
2915 health_code_update(&health_thread_cmd
);
2917 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2921 /* Means that it's not implemented on the tracer side. */
2925 /* TODO: Report error to user */
2926 DBG2("Calibrate app PID %d returned with error %d",
2933 DBG("UST app global domain calibration finished");
2937 health_code_update(&health_thread_cmd
);