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>
29 #include <common/common.h>
32 #include "ust-consumer.h"
37 * Delete ust context safely. RCU read lock must be held before calling
41 void delete_ust_app_ctx(int sock
, struct ust_app_ctx
*ua_ctx
)
44 ustctl_release_object(sock
, ua_ctx
->obj
);
51 * Delete ust app event safely. RCU read lock must be held before calling
55 void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
58 struct lttng_ht_iter iter
;
59 struct ust_app_ctx
*ua_ctx
;
61 /* Destroy each context of event */
62 cds_lfht_for_each_entry(ua_event
->ctx
->ht
, &iter
.iter
, ua_ctx
,
64 ret
= lttng_ht_del(ua_event
->ctx
, &iter
);
66 delete_ust_app_ctx(sock
, ua_ctx
);
68 lttng_ht_destroy(ua_event
->ctx
);
70 if (ua_event
->obj
!= NULL
) {
71 ustctl_release_object(sock
, ua_event
->obj
);
78 * Delete ust app stream safely. RCU read lock must be held before calling
82 void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
85 ustctl_release_object(sock
, stream
->obj
);
86 lttng_fd_put(LTTNG_FD_APPS
, 2);
93 * Delete ust app channel safely. RCU read lock must be held before calling
97 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
100 struct lttng_ht_iter iter
;
101 struct ust_app_event
*ua_event
;
102 struct ust_app_ctx
*ua_ctx
;
103 struct ltt_ust_stream
*stream
, *stmp
;
106 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
107 cds_list_del(&stream
->list
);
108 delete_ust_app_stream(sock
, stream
);
112 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
113 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
115 delete_ust_app_ctx(sock
, ua_ctx
);
117 lttng_ht_destroy(ua_chan
->ctx
);
120 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
122 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
124 delete_ust_app_event(sock
, ua_event
);
126 lttng_ht_destroy(ua_chan
->events
);
128 if (ua_chan
->obj
!= NULL
) {
129 ustctl_release_object(sock
, ua_chan
->obj
);
130 lttng_fd_put(LTTNG_FD_APPS
, 2);
137 * Delete ust app session safely. RCU read lock must be held before calling
141 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
)
144 struct lttng_ht_iter iter
;
145 struct ust_app_channel
*ua_chan
;
147 if (ua_sess
->metadata
) {
148 if (ua_sess
->metadata
->stream_obj
) {
149 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
150 lttng_fd_put(LTTNG_FD_APPS
, 2);
151 free(ua_sess
->metadata
->stream_obj
);
153 if (ua_sess
->metadata
->obj
) {
154 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
155 lttng_fd_put(LTTNG_FD_APPS
, 2);
156 free(ua_sess
->metadata
->obj
);
158 trace_ust_destroy_metadata(ua_sess
->metadata
);
161 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
163 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
165 delete_ust_app_channel(sock
, ua_chan
);
167 lttng_ht_destroy(ua_sess
->channels
);
169 if (ua_sess
->handle
!= -1) {
170 ustctl_release_handle(sock
, ua_sess
->handle
);
176 * Delete a traceable application structure from the global list. Never call
177 * this function outside of a call_rcu call.
180 void delete_ust_app(struct ust_app
*app
)
183 struct lttng_ht_iter iter
;
184 struct ust_app_session
*ua_sess
;
188 /* Delete ust app sessions info */
193 cds_lfht_for_each_entry(app
->sessions
->ht
, &iter
.iter
, ua_sess
,
195 ret
= lttng_ht_del(app
->sessions
, &iter
);
197 delete_ust_app_session(app
->sock
, ua_sess
);
199 lttng_ht_destroy(app
->sessions
);
202 * Wait until we have deleted the application from the sock hash table
203 * before closing this socket, otherwise an application could re-use the
204 * socket ID and race with the teardown, using the same hash table entry.
206 * It's OK to leave the close in call_rcu. We want it to stay unique for
207 * all RCU readers that could run concurrently with unregister app,
208 * therefore we _need_ to only close that socket after a grace period. So
209 * it should stay in this RCU callback.
211 * This close() is a very important step of the synchronization model so
212 * every modification to this function must be carefully reviewed.
218 lttng_fd_put(LTTNG_FD_APPS
, 1);
220 DBG2("UST app pid %d deleted", app
->pid
);
227 * URCU intermediate call to delete an UST app.
230 void delete_ust_app_rcu(struct rcu_head
*head
)
232 struct lttng_ht_node_ulong
*node
=
233 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
234 struct ust_app
*app
=
235 caa_container_of(node
, struct ust_app
, pid_n
);
237 DBG3("Call RCU deleting app PID %d", app
->pid
);
242 * Alloc new UST app session.
245 struct ust_app_session
*alloc_ust_app_session(void)
247 struct ust_app_session
*ua_sess
;
249 /* Init most of the default value by allocating and zeroing */
250 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
251 if (ua_sess
== NULL
) {
256 ua_sess
->handle
= -1;
257 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
266 * Alloc new UST app channel.
269 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
270 struct lttng_ust_channel
*attr
)
272 struct ust_app_channel
*ua_chan
;
274 /* Init most of the default value by allocating and zeroing */
275 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
276 if (ua_chan
== NULL
) {
281 /* Setup channel name */
282 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
283 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
285 ua_chan
->enabled
= 1;
286 ua_chan
->handle
= -1;
287 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
288 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
289 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
291 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
293 /* Copy attributes */
295 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
298 DBG3("UST app channel %s allocated", ua_chan
->name
);
307 * Alloc new UST app event.
310 struct ust_app_event
*alloc_ust_app_event(char *name
,
311 struct lttng_ust_event
*attr
)
313 struct ust_app_event
*ua_event
;
315 /* Init most of the default value by allocating and zeroing */
316 ua_event
= zmalloc(sizeof(struct ust_app_event
));
317 if (ua_event
== NULL
) {
322 ua_event
->enabled
= 1;
323 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
324 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
325 ua_event
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
326 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
328 /* Copy attributes */
330 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
333 DBG3("UST app event %s allocated", ua_event
->name
);
342 * Alloc new UST app context.
345 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
347 struct ust_app_ctx
*ua_ctx
;
349 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
350 if (ua_ctx
== NULL
) {
355 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
358 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
365 * Find an ust_app using the sock and return it. RCU read side lock must be
366 * held before calling this helper function.
369 struct ust_app
*find_app_by_sock(int sock
)
371 struct lttng_ht_node_ulong
*node
;
372 struct lttng_ht_iter iter
;
374 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
375 node
= lttng_ht_iter_get_node_ulong(&iter
);
377 DBG2("UST app find by sock %d not found", sock
);
381 return caa_container_of(node
, struct ust_app
, sock_n
);
388 * Create the channel context on the tracer.
391 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
392 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
396 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
397 ua_chan
->obj
, &ua_ctx
->obj
);
402 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
404 DBG2("UST app context created successfully for channel %s", ua_chan
->name
);
411 * Create the event context on the tracer.
414 int create_ust_event_context(struct ust_app_event
*ua_event
,
415 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
419 ret
= ustctl_add_context(app
->sock
, &ua_ctx
->ctx
,
420 ua_event
->obj
, &ua_ctx
->obj
);
425 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
427 DBG2("UST app context created successfully for event %s", ua_event
->name
);
434 * Disable the specified event on to UST tracer for the UST session.
436 static int disable_ust_event(struct ust_app
*app
,
437 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
441 ret
= ustctl_disable(app
->sock
, ua_event
->obj
);
443 ERR("UST app event %s disable failed for app (pid: %d) "
444 "and session handle %d with ret %d",
445 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
449 DBG2("UST app event %s disabled successfully for app (pid: %d)",
450 ua_event
->attr
.name
, app
->pid
);
457 * Disable the specified channel on to UST tracer for the UST session.
459 static int disable_ust_channel(struct ust_app
*app
,
460 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
464 ret
= ustctl_disable(app
->sock
, ua_chan
->obj
);
466 ERR("UST app channel %s disable failed for app (pid: %d) "
467 "and session handle %d with ret %d",
468 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
472 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
473 ua_chan
->name
, app
->pid
);
480 * Enable the specified channel on to UST tracer for the UST session.
482 static int enable_ust_channel(struct ust_app
*app
,
483 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
487 ret
= ustctl_enable(app
->sock
, ua_chan
->obj
);
489 ERR("UST app channel %s enable failed for app (pid: %d) "
490 "and session handle %d with ret %d",
491 ua_chan
->name
, app
->pid
, ua_sess
->handle
, ret
);
495 ua_chan
->enabled
= 1;
497 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
498 ua_chan
->name
, app
->pid
);
505 * Enable the specified event on to UST tracer for the UST session.
507 static int enable_ust_event(struct ust_app
*app
,
508 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
512 ret
= ustctl_enable(app
->sock
, ua_event
->obj
);
514 ERR("UST app event %s enable failed for app (pid: %d) "
515 "and session handle %d with ret %d",
516 ua_event
->attr
.name
, app
->pid
, ua_sess
->handle
, ret
);
520 DBG2("UST app event %s enabled successfully for app (pid: %d)",
521 ua_event
->attr
.name
, app
->pid
);
528 * Open metadata onto the UST tracer for a UST session.
530 static int open_ust_metadata(struct ust_app
*app
,
531 struct ust_app_session
*ua_sess
)
534 struct lttng_ust_channel_attr uattr
;
536 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
537 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
538 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
539 uattr
.switch_timer_interval
=
540 ua_sess
->metadata
->attr
.switch_timer_interval
;
541 uattr
.read_timer_interval
=
542 ua_sess
->metadata
->attr
.read_timer_interval
;
543 uattr
.output
= ua_sess
->metadata
->attr
.output
;
545 /* We are going to receive 2 fds, we need to reserve them. */
546 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
548 ERR("Exhausted number of available FD upon metadata open");
551 /* UST tracer metadata creation */
552 ret
= ustctl_open_metadata(app
->sock
, ua_sess
->handle
, &uattr
,
553 &ua_sess
->metadata
->obj
);
555 ERR("UST app open metadata failed for app pid:%d with ret %d",
560 ua_sess
->metadata
->handle
= ua_sess
->metadata
->obj
->handle
;
567 * Create stream onto the UST tracer for a UST session.
569 static int create_ust_stream(struct ust_app
*app
,
570 struct ust_app_session
*ua_sess
)
574 /* We are going to receive 2 fds, we need to reserve them. */
575 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
577 ERR("Exhausted number of available FD upon metadata stream create");
580 ret
= ustctl_create_stream(app
->sock
, ua_sess
->metadata
->obj
,
581 &ua_sess
->metadata
->stream_obj
);
583 ERR("UST create metadata stream failed");
592 * Create the specified channel onto the UST tracer for a UST session.
594 static int create_ust_channel(struct ust_app
*app
,
595 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
599 /* TODO: remove cast and use lttng-ust-abi.h */
601 /* We are going to receive 2 fds, we need to reserve them. */
602 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
604 ERR("Exhausted number of available FD upon create channel");
607 ret
= ustctl_create_channel(app
->sock
, ua_sess
->handle
,
608 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
610 ERR("Creating channel %s for app (pid: %d, sock: %d) "
611 "and session handle %d with ret %d",
612 ua_chan
->name
, app
->pid
, app
->sock
,
613 ua_sess
->handle
, ret
);
614 lttng_fd_put(LTTNG_FD_APPS
, 2);
618 ua_chan
->handle
= ua_chan
->obj
->handle
;
620 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
621 ua_chan
->name
, app
->pid
, app
->sock
);
623 /* If channel is not enabled, disable it on the tracer */
624 if (!ua_chan
->enabled
) {
625 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
636 * Create the specified event onto the UST tracer for a UST session.
639 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
640 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
644 /* Create UST event on tracer */
645 ret
= ustctl_create_event(app
->sock
, &ua_event
->attr
, ua_chan
->obj
,
648 if (ret
== -EEXIST
) {
652 ERR("Error ustctl create event %s for app pid: %d with ret %d",
653 ua_event
->attr
.name
, app
->pid
, ret
);
657 ua_event
->handle
= ua_event
->obj
->handle
;
659 DBG2("UST app event %s created successfully for pid:%d",
660 ua_event
->attr
.name
, app
->pid
);
662 /* If event not enabled, disable it on the tracer */
663 if (ua_event
->enabled
== 0) {
664 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
667 * If we hit an EPERM, something is wrong with our disable call. If
668 * we get an EEXIST, there is a problem on the tracer side since we
673 /* Code flow problem */
676 /* It's OK for our use case. */
691 * Copy data between an UST app event and a LTT event.
693 static void shadow_copy_event(struct ust_app_event
*ua_event
,
694 struct ltt_ust_event
*uevent
)
696 struct lttng_ht_iter iter
;
697 struct ltt_ust_context
*uctx
;
698 struct ust_app_ctx
*ua_ctx
;
700 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
701 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
703 ua_event
->enabled
= uevent
->enabled
;
705 /* Copy event attributes */
706 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
708 cds_lfht_for_each_entry(uevent
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
709 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
710 if (ua_ctx
== NULL
) {
711 /* malloc() failed. We should simply stop */
715 lttng_ht_node_init_ulong(&ua_ctx
->node
,
716 (unsigned long) ua_ctx
->ctx
.ctx
);
717 lttng_ht_add_unique_ulong(ua_event
->ctx
, &ua_ctx
->node
);
722 * Copy data between an UST app channel and a LTT channel.
724 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
725 struct ltt_ust_channel
*uchan
)
727 struct lttng_ht_iter iter
;
728 struct lttng_ht_node_str
*ua_event_node
;
729 struct ltt_ust_event
*uevent
;
730 struct ltt_ust_context
*uctx
;
731 struct ust_app_event
*ua_event
;
732 struct ust_app_ctx
*ua_ctx
;
734 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
736 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
737 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
738 /* Copy event attributes */
739 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
741 ua_chan
->enabled
= uchan
->enabled
;
743 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
744 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
745 if (ua_ctx
== NULL
) {
748 lttng_ht_node_init_ulong(&ua_ctx
->node
,
749 (unsigned long) ua_ctx
->ctx
.ctx
);
750 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
753 /* Copy all events from ltt ust channel to ust app channel */
754 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
755 struct lttng_ht_iter uiter
;
757 lttng_ht_lookup(ua_chan
->events
, (void *) uevent
->attr
.name
, &uiter
);
758 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
759 if (ua_event_node
== NULL
) {
760 DBG2("UST event %s not found on shadow copy channel",
762 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
763 if (ua_event
== NULL
) {
766 shadow_copy_event(ua_event
, uevent
);
767 lttng_ht_add_unique_str(ua_chan
->events
, &ua_event
->node
);
771 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
775 * Copy data between a UST app session and a regular LTT session.
777 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
778 struct ltt_ust_session
*usess
, struct ust_app
*app
)
780 struct lttng_ht_node_str
*ua_chan_node
;
781 struct lttng_ht_iter iter
;
782 struct ltt_ust_channel
*uchan
;
783 struct ust_app_channel
*ua_chan
;
789 /* Get date and time for unique app path */
791 timeinfo
= localtime(&rawtime
);
792 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
794 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
796 ua_sess
->id
= usess
->id
;
797 ua_sess
->uid
= usess
->uid
;
798 ua_sess
->gid
= usess
->gid
;
800 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s/%s-%d-%s", usess
->pathname
,
801 app
->name
, app
->pid
, datetime
);
803 PERROR("asprintf UST shadow copy session");
804 /* TODO: We cannot return an error from here.. */
808 /* TODO: support all UST domain */
810 /* Iterate over all channels in global domain. */
811 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
813 struct lttng_ht_iter uiter
;
815 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
816 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
817 if (ua_chan_node
!= NULL
) {
818 /* Session exist. Contiuing. */
822 DBG2("Channel %s not found on shadow session copy, creating it",
824 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
825 if (ua_chan
== NULL
) {
826 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
830 shadow_copy_channel(ua_chan
, uchan
);
831 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
836 * Lookup sesison wrapper.
839 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
840 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
842 /* Get right UST app session from app */
843 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
847 * Return ust app session from the app session hashtable using the UST session
850 static struct ust_app_session
*lookup_session_by_app(
851 struct ltt_ust_session
*usess
, struct ust_app
*app
)
853 struct lttng_ht_iter iter
;
854 struct lttng_ht_node_ulong
*node
;
856 __lookup_session_by_app(usess
, app
, &iter
);
857 node
= lttng_ht_iter_get_node_ulong(&iter
);
862 return caa_container_of(node
, struct ust_app_session
, node
);
869 * Create a UST session onto the tracer of app and add it the session
872 * Return ust app session or NULL on error.
874 static struct ust_app_session
*create_ust_app_session(
875 struct ltt_ust_session
*usess
, struct ust_app
*app
)
878 struct ust_app_session
*ua_sess
;
880 ua_sess
= lookup_session_by_app(usess
, app
);
881 if (ua_sess
== NULL
) {
882 DBG2("UST app pid: %d session id %d not found, creating it",
883 app
->pid
, usess
->id
);
884 ua_sess
= alloc_ust_app_session();
885 if (ua_sess
== NULL
) {
886 /* Only malloc can failed so something is really wrong */
889 shadow_copy_session(ua_sess
, usess
, app
);
892 if (ua_sess
->handle
== -1) {
893 ret
= ustctl_create_session(app
->sock
);
895 ERR("Creating session for app pid %d", app
->pid
);
896 /* This means that the tracer is gone... */
897 ua_sess
= (void*) -1UL;
901 ua_sess
->handle
= ret
;
903 /* Add ust app session to app's HT */
904 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
905 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
907 DBG2("UST app session created successfully with handle %d", ret
);
914 delete_ust_app_session(-1, ua_sess
);
919 * Create a context for the channel on the tracer.
922 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
923 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
927 struct lttng_ht_iter iter
;
928 struct lttng_ht_node_ulong
*node
;
929 struct ust_app_ctx
*ua_ctx
;
931 DBG2("UST app adding context to channel %s", ua_chan
->name
);
933 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
934 node
= lttng_ht_iter_get_node_ulong(&iter
);
940 ua_ctx
= alloc_ust_app_ctx(uctx
);
941 if (ua_ctx
== NULL
) {
947 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
948 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
950 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
960 * Create an UST context and enable it for the event on the tracer.
963 int create_ust_app_event_context(struct ust_app_session
*ua_sess
,
964 struct ust_app_event
*ua_event
, struct lttng_ust_context
*uctx
,
968 struct lttng_ht_iter iter
;
969 struct lttng_ht_node_ulong
*node
;
970 struct ust_app_ctx
*ua_ctx
;
972 DBG2("UST app adding context to event %s", ua_event
->name
);
974 lttng_ht_lookup(ua_event
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
975 node
= lttng_ht_iter_get_node_ulong(&iter
);
981 ua_ctx
= alloc_ust_app_ctx(uctx
);
982 if (ua_ctx
== NULL
) {
988 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
989 lttng_ht_add_unique_ulong(ua_event
->ctx
, &ua_ctx
->node
);
991 ret
= create_ust_event_context(ua_event
, ua_ctx
, app
);
1001 * Enable on the tracer side a ust app event for the session and channel.
1004 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
1005 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1009 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
1014 ua_event
->enabled
= 1;
1021 * Disable on the tracer side a ust app event for the session and channel.
1023 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
1024 struct ust_app_event
*ua_event
, struct ust_app
*app
)
1028 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1033 ua_event
->enabled
= 0;
1040 * Lookup ust app channel for session and disable it on the tracer side.
1043 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1044 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1048 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1053 ua_chan
->enabled
= 0;
1060 * Lookup ust app channel for session and enable it on the tracer side.
1062 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1063 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1066 struct lttng_ht_iter iter
;
1067 struct lttng_ht_node_str
*ua_chan_node
;
1068 struct ust_app_channel
*ua_chan
;
1070 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1071 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1072 if (ua_chan_node
== NULL
) {
1073 DBG2("Unable to find channel %s in ust session id %u",
1074 uchan
->name
, ua_sess
->id
);
1078 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1080 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1090 * Create UST app channel and create it on the tracer.
1092 static struct ust_app_channel
*create_ust_app_channel(
1093 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
1094 struct ust_app
*app
)
1097 struct lttng_ht_iter iter
;
1098 struct lttng_ht_node_str
*ua_chan_node
;
1099 struct ust_app_channel
*ua_chan
;
1101 /* Lookup channel in the ust app session */
1102 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1103 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1104 if (ua_chan_node
!= NULL
) {
1105 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1109 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1110 if (ua_chan
== NULL
) {
1111 /* Only malloc can fail here */
1114 shadow_copy_channel(ua_chan
, uchan
);
1116 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1118 /* Not found previously means that it does not exist on the tracer */
1119 assert(ret
!= -EEXIST
);
1123 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1125 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1132 delete_ust_app_channel(-1, ua_chan
);
1137 * Create UST app event and create it on the tracer side.
1140 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1141 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1142 struct ust_app
*app
)
1145 struct lttng_ht_iter iter
;
1146 struct lttng_ht_node_str
*ua_event_node
;
1147 struct ust_app_event
*ua_event
;
1149 /* Get event node */
1150 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
1151 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
1152 if (ua_event_node
!= NULL
) {
1157 /* Does not exist so create one */
1158 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1159 if (ua_event
== NULL
) {
1160 /* Only malloc can failed so something is really wrong */
1164 shadow_copy_event(ua_event
, uevent
);
1166 /* Create it on the tracer side */
1167 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1169 /* Not found previously means that it does not exist on the tracer */
1170 assert(ret
!= -EEXIST
);
1174 lttng_ht_add_unique_str(ua_chan
->events
, &ua_event
->node
);
1176 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1183 /* Valid. Calling here is already in a read side lock */
1184 delete_ust_app_event(-1, ua_event
);
1189 * Create UST metadata and open it on the tracer side.
1191 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1192 char *pathname
, struct ust_app
*app
)
1196 if (ua_sess
->metadata
== NULL
) {
1197 /* Allocate UST metadata */
1198 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1199 if (ua_sess
->metadata
== NULL
) {
1200 /* malloc() failed */
1204 ret
= open_ust_metadata(app
, ua_sess
);
1206 DBG3("Opening metadata failed. Cleaning up memory");
1208 /* Cleanup failed metadata struct */
1209 free(ua_sess
->metadata
);
1211 * This is very important because delete_ust_app_session check if
1212 * the pointer is null or not in order to delete the metadata.
1214 ua_sess
->metadata
= NULL
;
1218 DBG2("UST metadata opened for app pid %d", app
->pid
);
1221 /* Open UST metadata stream */
1222 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1223 ret
= create_ust_stream(app
, ua_sess
);
1228 ret
= run_as_mkdir(ua_sess
->path
, S_IRWXU
| S_IRWXG
,
1229 ua_sess
->uid
, ua_sess
->gid
);
1231 PERROR("mkdir UST metadata");
1235 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1236 "%s/metadata", ua_sess
->path
);
1238 PERROR("asprintf UST create stream");
1242 DBG2("UST metadata stream object created for app pid %d",
1245 ERR("Attempting to create stream without metadata opened");
1256 * Return pointer to traceable apps list.
1258 struct lttng_ht
*ust_app_get_ht(void)
1264 * Return ust app pointer or NULL if not found.
1266 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1268 struct lttng_ht_node_ulong
*node
;
1269 struct lttng_ht_iter iter
;
1272 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1273 node
= lttng_ht_iter_get_node_ulong(&iter
);
1275 DBG2("UST app no found with pid %d", pid
);
1280 DBG2("Found UST app by pid %d", pid
);
1282 return caa_container_of(node
, struct ust_app
, pid_n
);
1290 * Using pid and uid (of the app), allocate a new ust_app struct and
1291 * add it to the global traceable app list.
1293 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1294 * bitness is not supported.
1296 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1298 struct ust_app
*lta
;
1301 if ((msg
->bits_per_long
== 64 && ust_consumerd64_fd
== -EINVAL
)
1302 || (msg
->bits_per_long
== 32 && ust_consumerd32_fd
== -EINVAL
)) {
1303 ERR("Registration failed: application \"%s\" (pid: %d) has "
1304 "%d-bit long, but no consumerd for this long size is available.\n",
1305 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1310 lttng_fd_put(LTTNG_FD_APPS
, 1);
1313 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1314 ERR("Registration failed: application \"%s\" (pid: %d) has "
1315 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1316 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1321 lttng_fd_put(LTTNG_FD_APPS
, 1);
1324 lta
= zmalloc(sizeof(struct ust_app
));
1330 lta
->ppid
= msg
->ppid
;
1331 lta
->uid
= msg
->uid
;
1332 lta
->gid
= msg
->gid
;
1333 lta
->compatible
= 0; /* Not compatible until proven */
1334 lta
->bits_per_long
= msg
->bits_per_long
;
1335 lta
->v_major
= msg
->major
;
1336 lta
->v_minor
= msg
->minor
;
1337 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1338 lta
->name
[16] = '\0';
1339 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1341 lta
->pid
= msg
->pid
;
1342 lttng_ht_node_init_ulong(<a
->pid_n
, (unsigned long)lta
->pid
);
1344 lttng_ht_node_init_ulong(<a
->sock_n
, (unsigned long)lta
->sock
);
1349 * On a re-registration, we want to kick out the previous registration of
1352 lttng_ht_add_replace_ulong(ust_app_ht
, <a
->pid_n
);
1355 * The socket _should_ be unique until _we_ call close. So, a add_unique
1356 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1357 * already in the table.
1359 lttng_ht_add_unique_ulong(ust_app_ht_by_sock
, <a
->sock_n
);
1363 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1364 " (version %d.%d)", lta
->pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1365 lta
->sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1371 * Unregister app by removing it from the global traceable app list and freeing
1374 * The socket is already closed at this point so no close to sock.
1376 void ust_app_unregister(int sock
)
1378 struct ust_app
*lta
;
1379 struct lttng_ht_node_ulong
*node
;
1380 struct lttng_ht_iter iter
;
1385 /* Get the node reference for a call_rcu */
1386 lttng_ht_lookup(ust_app_ht_by_sock
, (void *)((unsigned long) sock
), &iter
);
1387 node
= lttng_ht_iter_get_node_ulong(&iter
);
1389 ERR("Unable to find app by sock %d", sock
);
1393 lta
= caa_container_of(node
, struct ust_app
, sock_n
);
1395 DBG("PID %d unregistering with sock %d", lta
->pid
, sock
);
1397 /* Remove application from PID hash table */
1398 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1401 /* Assign second node for deletion */
1402 iter
.iter
.node
= <a
->pid_n
.node
;
1404 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1408 call_rcu(<a
->pid_n
.head
, delete_ust_app_rcu
);
1416 * Return traceable_app_count
1418 unsigned long ust_app_list_count(void)
1420 unsigned long count
;
1423 count
= lttng_ht_get_count(ust_app_ht
);
1430 * Fill events array with all events name of all registered apps.
1432 int ust_app_list_events(struct lttng_event
**events
)
1435 size_t nbmem
, count
= 0;
1436 struct lttng_ht_iter iter
;
1437 struct ust_app
*app
;
1438 struct lttng_event
*tmp
;
1440 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1441 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1443 PERROR("zmalloc ust app events");
1450 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1451 struct lttng_ust_tracepoint_iter uiter
;
1453 if (!app
->compatible
) {
1455 * TODO: In time, we should notice the caller of this error by
1456 * telling him that this is a version error.
1460 handle
= ustctl_tracepoint_list(app
->sock
);
1462 ERR("UST app list events getting handle failed for app pid %d",
1467 while ((ret
= ustctl_tracepoint_list_get(app
->sock
, handle
,
1468 &uiter
)) != -ENOENT
) {
1469 if (count
>= nbmem
) {
1470 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1473 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event
));
1475 PERROR("realloc ust app events");
1480 memcpy(tmp
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1481 tmp
[count
].loglevel
= uiter
.loglevel
;
1482 tmp
[count
].type
= LTTNG_UST_TRACEPOINT
;
1483 tmp
[count
].pid
= app
->pid
;
1484 tmp
[count
].enabled
= -1;
1492 DBG2("UST app list events done (%zu events)", count
);
1501 * Free and clean all traceable apps of the global list.
1503 void ust_app_clean_list(void)
1506 struct lttng_ht_iter iter
;
1507 struct lttng_ht_node_ulong
*node
;
1509 DBG2("UST app cleaning registered apps hash table");
1513 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, node
, node
) {
1514 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1516 call_rcu(&node
->head
, delete_ust_app_rcu
);
1519 /* Cleanup socket hash table */
1520 cds_lfht_for_each_entry(ust_app_ht_by_sock
->ht
, &iter
.iter
, node
, node
) {
1521 ret
= lttng_ht_del(ust_app_ht_by_sock
, &iter
);
1525 /* Destroy is done only when the ht is empty */
1526 lttng_ht_destroy(ust_app_ht
);
1527 lttng_ht_destroy(ust_app_ht_by_sock
);
1533 * Init UST app hash table.
1535 void ust_app_ht_alloc(void)
1537 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1538 ust_app_ht_by_sock
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1542 * For a specific UST session, disable the channel for all registered apps.
1544 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1545 struct ltt_ust_channel
*uchan
)
1548 struct lttng_ht_iter iter
;
1549 struct lttng_ht_node_str
*ua_chan_node
;
1550 struct ust_app
*app
;
1551 struct ust_app_session
*ua_sess
;
1552 struct ust_app_channel
*ua_chan
;
1554 if (usess
== NULL
|| uchan
== NULL
) {
1555 ERR("Disabling UST global channel with NULL values");
1560 DBG2("UST app disabling channel %s from global domain for session id %d",
1561 uchan
->name
, usess
->id
);
1565 /* For every registered applications */
1566 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1567 struct lttng_ht_iter uiter
;
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 ua_sess
= lookup_session_by_app(usess
, app
);
1576 if (ua_sess
== NULL
) {
1581 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1582 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1583 /* If the session if found for the app, the channel must be there */
1584 assert(ua_chan_node
);
1586 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1587 /* The channel must not be already disabled */
1588 assert(ua_chan
->enabled
== 1);
1590 /* Disable channel onto application */
1591 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1593 /* XXX: We might want to report this error at some point... */
1605 * For a specific UST session, enable the channel for all registered apps.
1607 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1608 struct ltt_ust_channel
*uchan
)
1611 struct lttng_ht_iter iter
;
1612 struct ust_app
*app
;
1613 struct ust_app_session
*ua_sess
;
1615 if (usess
== NULL
|| uchan
== NULL
) {
1616 ERR("Adding UST global channel to NULL values");
1621 DBG2("UST app enabling channel %s to global domain for session id %d",
1622 uchan
->name
, usess
->id
);
1626 /* For every registered applications */
1627 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1628 if (!app
->compatible
) {
1630 * TODO: In time, we should notice the caller of this error by
1631 * telling him that this is a version error.
1635 ua_sess
= lookup_session_by_app(usess
, app
);
1636 if (ua_sess
== NULL
) {
1640 /* Enable channel onto application */
1641 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1643 /* XXX: We might want to report this error at some point... */
1655 * Disable an event in a channel and for a specific session.
1657 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1658 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1661 struct lttng_ht_iter iter
, uiter
;
1662 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1663 struct ust_app
*app
;
1664 struct ust_app_session
*ua_sess
;
1665 struct ust_app_channel
*ua_chan
;
1666 struct ust_app_event
*ua_event
;
1668 DBG("UST app disabling event %s for all apps in channel "
1669 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1673 /* For all registered applications */
1674 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1675 if (!app
->compatible
) {
1677 * TODO: In time, we should notice the caller of this error by
1678 * telling him that this is a version error.
1682 ua_sess
= lookup_session_by_app(usess
, app
);
1683 if (ua_sess
== NULL
) {
1688 /* Lookup channel in the ust app session */
1689 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1690 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1691 if (ua_chan_node
== NULL
) {
1692 DBG2("Channel %s not found in session id %d for app pid %d."
1693 "Skipping", uchan
->name
, usess
->id
, app
->pid
);
1696 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1698 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
1699 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1700 if (ua_event_node
== NULL
) {
1701 DBG2("Event %s not found in channel %s for app pid %d."
1702 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->pid
);
1705 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1707 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1709 /* XXX: Report error someday... */
1720 * For a specific UST session and UST channel, the event for all
1723 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
1724 struct ltt_ust_channel
*uchan
)
1727 struct lttng_ht_iter iter
, uiter
;
1728 struct lttng_ht_node_str
*ua_chan_node
;
1729 struct ust_app
*app
;
1730 struct ust_app_session
*ua_sess
;
1731 struct ust_app_channel
*ua_chan
;
1732 struct ust_app_event
*ua_event
;
1734 DBG("UST app disabling all event for all apps in channel "
1735 "%s for session id %d", uchan
->name
, usess
->id
);
1739 /* For all registered applications */
1740 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1741 if (!app
->compatible
) {
1743 * TODO: In time, we should notice the caller of this error by
1744 * telling him that this is a version error.
1748 ua_sess
= lookup_session_by_app(usess
, app
);
1749 /* If ua_sess is NULL, there is a code flow error */
1752 /* Lookup channel in the ust app session */
1753 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1754 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1755 /* If the channel is not found, there is a code flow error */
1756 assert(ua_chan_node
);
1758 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1760 /* Disable each events of channel */
1761 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
1763 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1765 /* XXX: Report error someday... */
1777 * For a specific UST session, create the channel for all registered apps.
1779 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
1780 struct ltt_ust_channel
*uchan
)
1782 struct lttng_ht_iter iter
;
1783 struct ust_app
*app
;
1784 struct ust_app_session
*ua_sess
;
1785 struct ust_app_channel
*ua_chan
;
1787 /* Very wrong code flow */
1791 DBG2("UST app adding channel %s to global domain for session id %d",
1792 uchan
->name
, usess
->id
);
1796 /* For every registered applications */
1797 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1798 if (!app
->compatible
) {
1800 * TODO: In time, we should notice the caller of this error by
1801 * telling him that this is a version error.
1806 * Create session on the tracer side and add it to app session HT. Note
1807 * that if session exist, it will simply return a pointer to the ust
1810 ua_sess
= create_ust_app_session(usess
, app
);
1811 if (ua_sess
== NULL
) {
1812 /* The malloc() failed. */
1814 } else if (ua_sess
== (void *) -1UL) {
1815 /* The application's socket is not valid. Contiuing */
1819 /* Create channel onto application */
1820 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
1821 if (ua_chan
== NULL
) {
1822 /* Major problem here and it's maybe the tracer or malloc() */
1836 * Enable event for a specific session and channel on the tracer.
1838 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
1839 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1842 struct lttng_ht_iter iter
, uiter
;
1843 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1844 struct ust_app
*app
;
1845 struct ust_app_session
*ua_sess
;
1846 struct ust_app_channel
*ua_chan
;
1847 struct ust_app_event
*ua_event
;
1849 DBG("UST app enabling event %s for all apps for session id %d",
1850 uevent
->attr
.name
, usess
->id
);
1853 * NOTE: At this point, this function is called only if the session and
1854 * channel passed are already created for all apps. and enabled on the
1860 /* For all registered applications */
1861 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1862 if (!app
->compatible
) {
1864 * TODO: In time, we should notice the caller of this error by
1865 * telling him that this is a version error.
1869 ua_sess
= lookup_session_by_app(usess
, app
);
1870 /* If ua_sess is NULL, there is a code flow error */
1873 /* Lookup channel in the ust app session */
1874 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1875 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1876 /* If the channel is not found, there is a code flow error */
1877 assert(ua_chan_node
);
1879 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1881 lttng_ht_lookup(ua_chan
->events
, (void*)uevent
->attr
.name
, &uiter
);
1882 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1883 if (ua_event_node
== NULL
) {
1884 DBG3("UST app enable event %s not found for app PID %d."
1885 "Skipping app", uevent
->attr
.name
, app
->pid
);
1888 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1890 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
1902 * For a specific existing UST session and UST channel, creates the event for
1903 * all registered apps.
1905 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
1906 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1909 struct lttng_ht_iter iter
, uiter
;
1910 struct lttng_ht_node_str
*ua_chan_node
;
1911 struct ust_app
*app
;
1912 struct ust_app_session
*ua_sess
;
1913 struct ust_app_channel
*ua_chan
;
1915 DBG("UST app creating event %s for all apps for session id %d",
1916 uevent
->attr
.name
, usess
->id
);
1920 /* For all registered applications */
1921 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
1922 if (!app
->compatible
) {
1924 * TODO: In time, we should notice the caller of this error by
1925 * telling him that this is a version error.
1929 ua_sess
= lookup_session_by_app(usess
, app
);
1930 /* If ua_sess is NULL, there is a code flow error */
1933 /* Lookup channel in the ust app session */
1934 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1935 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1936 /* If the channel is not found, there is a code flow error */
1937 assert(ua_chan_node
);
1939 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1941 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
1943 if (ret
!= -EEXIST
) {
1944 /* Possible value at this point: -ENOMEM. If so, we stop! */
1947 DBG2("UST app event %s already exist on app PID %d",
1948 uevent
->attr
.name
, app
->pid
);
1959 * Start tracing for a specific UST session and app.
1961 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1964 struct lttng_ht_iter iter
;
1965 struct ust_app_session
*ua_sess
;
1966 struct ust_app_channel
*ua_chan
;
1967 struct ltt_ust_stream
*ustream
;
1970 DBG("Starting tracing for ust app pid %d", app
->pid
);
1974 if (!app
->compatible
) {
1978 ua_sess
= lookup_session_by_app(usess
, app
);
1979 if (ua_sess
== NULL
) {
1980 goto error_rcu_unlock
;
1983 /* Upon restart, we skip the setup, already done */
1984 if (ua_sess
->started
) {
1988 /* Indicate that the session has been started once */
1989 ua_sess
->started
= 1;
1991 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
1993 goto error_rcu_unlock
;
1996 /* For each channel */
1997 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
1999 /* Create all streams */
2001 /* Create UST stream */
2002 ustream
= zmalloc(sizeof(*ustream
));
2003 if (ustream
== NULL
) {
2004 PERROR("zmalloc ust stream");
2005 goto error_rcu_unlock
;
2008 /* We are going to receive 2 fds, we need to reserve them. */
2009 ret
= lttng_fd_get(LTTNG_FD_APPS
, 2);
2011 ERR("Exhausted number of available FD upon stream create");
2013 goto error_rcu_unlock
;
2015 ret
= ustctl_create_stream(app
->sock
, ua_chan
->obj
,
2018 /* Got all streams */
2019 lttng_fd_put(LTTNG_FD_APPS
, 2);
2023 ustream
->handle
= ustream
->obj
->handle
;
2025 /* Order is important */
2026 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
2027 ret
= snprintf(ustream
->pathname
, PATH_MAX
, "%s/%s_%u",
2028 ua_sess
->path
, ua_chan
->name
,
2029 ua_chan
->streams
.count
++);
2031 PERROR("asprintf UST create stream");
2033 * XXX what should we do here with the
2038 DBG2("UST stream %d ready at %s", ua_chan
->streams
.count
,
2043 switch (app
->bits_per_long
) {
2045 consumerd_fd
= ust_consumerd64_fd
;
2048 consumerd_fd
= ust_consumerd32_fd
;
2052 goto error_rcu_unlock
;
2055 /* Setup UST consumer socket and send fds to it */
2056 ret
= ust_consumer_send_session(consumerd_fd
, ua_sess
);
2058 goto error_rcu_unlock
;
2062 /* This start the UST tracing */
2063 ret
= ustctl_start_session(app
->sock
, ua_sess
->handle
);
2065 ERR("Error starting tracing for app pid: %d", app
->pid
);
2066 goto error_rcu_unlock
;
2069 /* Quiescent wait after starting trace */
2070 ustctl_wait_quiescent(app
->sock
);
2082 * Stop tracing for a specific UST session and app.
2084 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2087 struct lttng_ht_iter iter
;
2088 struct ust_app_session
*ua_sess
;
2089 struct ust_app_channel
*ua_chan
;
2091 DBG("Stopping tracing for ust app pid %d", app
->pid
);
2095 if (!app
->compatible
) {
2099 ua_sess
= lookup_session_by_app(usess
, app
);
2100 if (ua_sess
== NULL
) {
2101 /* Only malloc can failed so something is really wrong */
2102 goto error_rcu_unlock
;
2106 * If started = 0, it means that stop trace has been called for a session
2107 * that was never started. This is a code flow error and should never
2110 assert(ua_sess
->started
== 1);
2112 /* This inhibits UST tracing */
2113 ret
= ustctl_stop_session(app
->sock
, ua_sess
->handle
);
2115 ERR("Error stopping tracing for app pid: %d", app
->pid
);
2116 goto error_rcu_unlock
;
2119 /* Quiescent wait after stopping trace */
2120 ustctl_wait_quiescent(app
->sock
);
2122 /* Flushing buffers */
2123 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2125 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_chan
->obj
);
2127 ERR("UST app PID %d channel %s flush failed with ret %d",
2128 app
->pid
, ua_chan
->name
, ret
);
2129 /* Continuing flushing all buffers */
2134 /* Flush all buffers before stopping */
2135 ret
= ustctl_sock_flush_buffer(app
->sock
, ua_sess
->metadata
->obj
);
2137 ERR("UST app PID %d metadata flush failed with ret %d", app
->pid
,
2151 * Destroy a specific UST session in apps.
2153 int ust_app_destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2155 struct ust_app_session
*ua_sess
;
2156 struct lttng_ust_object_data obj
;
2157 struct lttng_ht_iter iter
;
2158 struct lttng_ht_node_ulong
*node
;
2161 DBG("Destroy tracing for ust app pid %d", app
->pid
);
2165 if (!app
->compatible
) {
2169 __lookup_session_by_app(usess
, app
, &iter
);
2170 node
= lttng_ht_iter_get_node_ulong(&iter
);
2172 /* Only malloc can failed so something is really wrong */
2173 goto error_rcu_unlock
;
2175 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2176 ret
= lttng_ht_del(app
->sessions
, &iter
);
2178 obj
.handle
= ua_sess
->handle
;
2181 obj
.memory_map_size
= 0;
2182 ustctl_release_object(app
->sock
, &obj
);
2184 delete_ust_app_session(app
->sock
, ua_sess
);
2186 /* Quiescent wait after stopping trace */
2187 ustctl_wait_quiescent(app
->sock
);
2199 * Start tracing for the UST session.
2201 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2204 struct lttng_ht_iter iter
;
2205 struct ust_app
*app
;
2207 DBG("Starting all UST traces");
2211 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2212 ret
= ust_app_start_trace(usess
, app
);
2214 /* Continue to next apps even on error */
2225 * Start tracing for the UST session.
2227 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2230 struct lttng_ht_iter iter
;
2231 struct ust_app
*app
;
2233 DBG("Stopping all UST traces");
2237 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2238 ret
= ust_app_stop_trace(usess
, app
);
2240 /* Continue to next apps even on error */
2251 * Destroy app UST session.
2253 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2256 struct lttng_ht_iter iter
;
2257 struct ust_app
*app
;
2259 DBG("Destroy all UST traces");
2263 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2264 ret
= ust_app_destroy_trace(usess
, app
);
2266 /* Continue to next apps even on error */
2277 * Add channels/events from UST global domain to registered apps at sock.
2279 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2282 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2283 struct ust_app
*app
;
2284 struct ust_app_session
*ua_sess
;
2285 struct ust_app_channel
*ua_chan
;
2286 struct ust_app_event
*ua_event
;
2287 struct ust_app_ctx
*ua_ctx
;
2289 if (usess
== NULL
) {
2290 ERR("No UST session on global update. Returning");
2294 DBG2("UST app global update for app sock %d for session id %d", sock
,
2299 app
= find_app_by_sock(sock
);
2301 ERR("Failed to update app sock %d", sock
);
2305 if (!app
->compatible
) {
2309 ua_sess
= create_ust_app_session(usess
, app
);
2310 if (ua_sess
== NULL
) {
2315 * We can iterate safely here over all UST app session sicne the create ust
2316 * app session above made a shadow copy of the UST global domain from the
2319 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2321 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2323 /* FIXME: Should we quit here or continue... */
2327 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2329 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2331 /* FIXME: Should we quit here or continue... */
2337 /* For each events */
2338 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2340 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2342 /* FIXME: Should we quit here or continue... */
2346 /* Add context on events. */
2347 cds_lfht_for_each_entry(ua_event
->ctx
->ht
, &iter_ctx
.iter
,
2348 ua_ctx
, node
.node
) {
2349 ret
= create_ust_event_context(ua_event
, ua_ctx
, app
);
2351 /* FIXME: Should we quit here or continue... */
2358 if (usess
->start_trace
) {
2359 ret
= ust_app_start_trace(usess
, app
);
2364 DBG2("UST trace started for app pid %d", app
->pid
);
2373 * Add context to a specific channel for global UST domain.
2375 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2376 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2379 struct lttng_ht_node_str
*ua_chan_node
;
2380 struct lttng_ht_iter iter
, uiter
;
2381 struct ust_app_channel
*ua_chan
= NULL
;
2382 struct ust_app_session
*ua_sess
;
2383 struct ust_app
*app
;
2387 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2388 if (!app
->compatible
) {
2390 * TODO: In time, we should notice the caller of this error by
2391 * telling him that this is a version error.
2395 ua_sess
= lookup_session_by_app(usess
, app
);
2396 if (ua_sess
== NULL
) {
2400 /* Lookup channel in the ust app session */
2401 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2402 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2403 if (ua_chan_node
== NULL
) {
2406 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2409 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2420 * Add context to a specific event in a channel for global UST domain.
2422 int ust_app_add_ctx_event_glb(struct ltt_ust_session
*usess
,
2423 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
,
2424 struct ltt_ust_context
*uctx
)
2427 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2428 struct lttng_ht_iter iter
, uiter
;
2429 struct ust_app_session
*ua_sess
;
2430 struct ust_app_event
*ua_event
;
2431 struct ust_app_channel
*ua_chan
= NULL
;
2432 struct ust_app
*app
;
2436 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2437 if (!app
->compatible
) {
2439 * TODO: In time, we should notice the caller of this error by
2440 * telling him that this is a version error.
2444 ua_sess
= lookup_session_by_app(usess
, app
);
2445 if (ua_sess
== NULL
) {
2449 /* Lookup channel in the ust app session */
2450 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2451 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2452 if (ua_chan_node
== NULL
) {
2455 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2458 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
2459 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
2460 if (ua_event_node
== NULL
) {
2463 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
,
2466 ret
= create_ust_app_event_context(ua_sess
, ua_event
, &uctx
->ctx
, app
);
2477 * Enable event for a channel from a UST session for a specific PID.
2479 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2480 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2483 struct lttng_ht_iter iter
;
2484 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2485 struct ust_app
*app
;
2486 struct ust_app_session
*ua_sess
;
2487 struct ust_app_channel
*ua_chan
;
2488 struct ust_app_event
*ua_event
;
2490 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2494 app
= ust_app_find_by_pid(pid
);
2496 ERR("UST app enable event per PID %d not found", pid
);
2501 if (!app
->compatible
) {
2506 ua_sess
= lookup_session_by_app(usess
, app
);
2507 /* If ua_sess is NULL, there is a code flow error */
2510 /* Lookup channel in the ust app session */
2511 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2512 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2513 /* If the channel is not found, there is a code flow error */
2514 assert(ua_chan_node
);
2516 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2518 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2519 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2520 if (ua_event_node
== NULL
) {
2521 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2526 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2528 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2540 * Disable event for a channel from a UST session for a specific PID.
2542 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2543 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2546 struct lttng_ht_iter iter
;
2547 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2548 struct ust_app
*app
;
2549 struct ust_app_session
*ua_sess
;
2550 struct ust_app_channel
*ua_chan
;
2551 struct ust_app_event
*ua_event
;
2553 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2557 app
= ust_app_find_by_pid(pid
);
2559 ERR("UST app disable event per PID %d not found", pid
);
2564 if (!app
->compatible
) {
2569 ua_sess
= lookup_session_by_app(usess
, app
);
2570 /* If ua_sess is NULL, there is a code flow error */
2573 /* Lookup channel in the ust app session */
2574 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2575 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2576 if (ua_chan_node
== NULL
) {
2577 /* Channel does not exist, skip disabling */
2580 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2582 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2583 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2584 if (ua_event_node
== NULL
) {
2585 /* Event does not exist, skip disabling */
2588 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2590 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2601 * Validate version of UST apps and set the compatible bit.
2603 int ust_app_validate_version(int sock
)
2606 struct ust_app
*app
;
2610 app
= find_app_by_sock(sock
);
2613 ret
= ustctl_tracer_version(sock
, &app
->version
);
2618 /* Validate version */
2619 if (app
->version
.major
> UST_APP_MAJOR_VERSION
) {
2623 DBG2("UST app PID %d is compatible with major version %d "
2624 "(supporting <= %d)", app
->pid
, app
->version
.major
,
2625 UST_APP_MAJOR_VERSION
);
2626 app
->compatible
= 1;
2631 DBG2("UST app PID %d is not compatible with major version %d "
2632 "(supporting <= %d)", app
->pid
, app
->version
.major
,
2633 UST_APP_MAJOR_VERSION
);
2634 app
->compatible
= 0;
2640 * Calibrate registered applications.
2642 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2645 struct lttng_ht_iter iter
;
2646 struct ust_app
*app
;
2650 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, pid_n
.node
) {
2651 if (!app
->compatible
) {
2653 * TODO: In time, we should notice the caller of this error by
2654 * telling him that this is a version error.
2659 ret
= ustctl_calibrate(app
->sock
, calibrate
);
2663 /* Means that it's not implemented on the tracer side. */
2667 /* TODO: Report error to user */
2668 DBG2("Calibrate app PID %d returned with error %d",
2675 DBG("UST app global domain calibration finished");