2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include <sys/types.h>
28 #include <urcu/compiler.h>
30 #include <common/common.h>
33 #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
);
92 * Delete ust app channel safely. RCU read lock must be held before calling
96 void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
99 struct lttng_ht_iter iter
;
100 struct ust_app_event
*ua_event
;
101 struct ust_app_ctx
*ua_ctx
;
102 struct ltt_ust_stream
*stream
, *stmp
;
105 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
106 cds_list_del(&stream
->list
);
107 delete_ust_app_stream(sock
, stream
);
111 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter
.iter
, ua_ctx
, node
.node
) {
112 ret
= lttng_ht_del(ua_chan
->ctx
, &iter
);
114 delete_ust_app_ctx(sock
, ua_ctx
);
116 lttng_ht_destroy(ua_chan
->ctx
);
119 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &iter
.iter
, ua_event
,
121 ret
= lttng_ht_del(ua_chan
->events
, &iter
);
123 delete_ust_app_event(sock
, ua_event
);
125 lttng_ht_destroy(ua_chan
->events
);
127 if (ua_chan
->obj
!= NULL
) {
128 ustctl_release_object(sock
, ua_chan
->obj
);
135 * Delete ust app session safely. RCU read lock must be held before calling
139 void delete_ust_app_session(int sock
, struct ust_app_session
*ua_sess
)
142 struct lttng_ht_iter iter
;
143 struct ust_app_channel
*ua_chan
;
145 if (ua_sess
->metadata
) {
146 if (ua_sess
->metadata
->stream_obj
) {
147 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
148 free(ua_sess
->metadata
->stream_obj
);
150 if (ua_sess
->metadata
->obj
) {
151 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
152 free(ua_sess
->metadata
->obj
);
156 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
158 ret
= lttng_ht_del(ua_sess
->channels
, &iter
);
160 delete_ust_app_channel(sock
, ua_chan
);
162 lttng_ht_destroy(ua_sess
->channels
);
164 if (ua_sess
->handle
!= -1) {
165 ustctl_release_handle(sock
, ua_sess
->handle
);
171 * Delete a traceable application structure from the global list. Never call
172 * this function outside of a call_rcu call.
175 void delete_ust_app(struct ust_app
*app
)
178 struct lttng_ht_iter iter
;
179 struct ust_app_session
*ua_sess
;
183 /* Delete ust app sessions info */
184 sock
= app
->key
.sock
;
188 cds_lfht_for_each_entry(app
->sessions
->ht
, &iter
.iter
, ua_sess
,
190 ret
= lttng_ht_del(app
->sessions
, &iter
);
192 delete_ust_app_session(app
->key
.sock
, ua_sess
);
194 lttng_ht_destroy(app
->sessions
);
197 * Wait until we have removed the key from the sock hash table before
198 * closing this socket, otherwise an application could re-use the socket ID
199 * and race with the teardown, using the same hash table entry.
203 DBG2("UST app pid %d deleted", app
->key
.pid
);
210 * URCU intermediate call to delete an UST app.
213 void delete_ust_app_rcu(struct rcu_head
*head
)
215 struct lttng_ht_node_ulong
*node
=
216 caa_container_of(head
, struct lttng_ht_node_ulong
, head
);
217 struct ust_app
*app
=
218 caa_container_of(node
, struct ust_app
, node
);
220 DBG3("Call RCU deleting app PID %d", app
->key
.pid
);
225 * Alloc new UST app session.
228 struct ust_app_session
*alloc_ust_app_session(void)
230 struct ust_app_session
*ua_sess
;
232 /* Init most of the default value by allocating and zeroing */
233 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
234 if (ua_sess
== NULL
) {
239 ua_sess
->handle
= -1;
240 ua_sess
->channels
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
249 * Alloc new UST app channel.
252 struct ust_app_channel
*alloc_ust_app_channel(char *name
,
253 struct lttng_ust_channel
*attr
)
255 struct ust_app_channel
*ua_chan
;
257 /* Init most of the default value by allocating and zeroing */
258 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
259 if (ua_chan
== NULL
) {
264 /* Setup channel name */
265 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
266 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
268 ua_chan
->enabled
= 1;
269 ua_chan
->handle
= -1;
270 ua_chan
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
271 ua_chan
->events
= lttng_ht_new(0, LTTNG_HT_TYPE_STRING
);
272 lttng_ht_node_init_str(&ua_chan
->node
, ua_chan
->name
);
274 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
276 /* Copy attributes */
278 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
281 DBG3("UST app channel %s allocated", ua_chan
->name
);
290 * Alloc new UST app event.
293 struct ust_app_event
*alloc_ust_app_event(char *name
,
294 struct lttng_ust_event
*attr
)
296 struct ust_app_event
*ua_event
;
298 /* Init most of the default value by allocating and zeroing */
299 ua_event
= zmalloc(sizeof(struct ust_app_event
));
300 if (ua_event
== NULL
) {
305 ua_event
->enabled
= 1;
306 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
307 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
308 ua_event
->ctx
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
309 lttng_ht_node_init_str(&ua_event
->node
, ua_event
->name
);
311 /* Copy attributes */
313 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
316 DBG3("UST app event %s allocated", ua_event
->name
);
325 * Alloc new UST app context.
328 struct ust_app_ctx
*alloc_ust_app_ctx(struct lttng_ust_context
*uctx
)
330 struct ust_app_ctx
*ua_ctx
;
332 ua_ctx
= zmalloc(sizeof(struct ust_app_ctx
));
333 if (ua_ctx
== NULL
) {
338 memcpy(&ua_ctx
->ctx
, uctx
, sizeof(ua_ctx
->ctx
));
341 DBG3("UST app context %d allocated", ua_ctx
->ctx
.ctx
);
348 * Find an ust_app using the sock and return it. RCU read side lock must be
349 * held before calling this helper function.
352 struct ust_app
*find_app_by_sock(int sock
)
354 struct lttng_ht_node_ulong
*node
;
355 struct ust_app_key
*key
;
356 struct lttng_ht_iter iter
;
358 lttng_ht_lookup(ust_app_sock_key_map
, (void *)((unsigned long) sock
),
360 node
= lttng_ht_iter_get_node_ulong(&iter
);
362 DBG2("UST app find by sock %d key not found", sock
);
365 key
= caa_container_of(node
, struct ust_app_key
, node
);
367 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) key
->pid
), &iter
);
368 node
= lttng_ht_iter_get_node_ulong(&iter
);
370 DBG2("UST app find by sock %d not found", sock
);
373 return caa_container_of(node
, struct ust_app
, node
);
380 * Create the channel context on the tracer.
383 int create_ust_channel_context(struct ust_app_channel
*ua_chan
,
384 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
388 ret
= ustctl_add_context(app
->key
.sock
, &ua_ctx
->ctx
,
389 ua_chan
->obj
, &ua_ctx
->obj
);
394 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
396 DBG2("UST app context created successfully for channel %s", ua_chan
->name
);
403 * Create the event context on the tracer.
406 int create_ust_event_context(struct ust_app_event
*ua_event
,
407 struct ust_app_ctx
*ua_ctx
, struct ust_app
*app
)
411 ret
= ustctl_add_context(app
->key
.sock
, &ua_ctx
->ctx
,
412 ua_event
->obj
, &ua_ctx
->obj
);
417 ua_ctx
->handle
= ua_ctx
->obj
->handle
;
419 DBG2("UST app context created successfully for event %s", ua_event
->name
);
426 * Disable the specified event on to UST tracer for the UST session.
428 static int disable_ust_event(struct ust_app
*app
,
429 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
433 ret
= ustctl_disable(app
->key
.sock
, ua_event
->obj
);
435 ERR("UST app event %s disable failed for app (pid: %d) "
436 "and session handle %d with ret %d",
437 ua_event
->attr
.name
, app
->key
.pid
, ua_sess
->handle
, ret
);
441 DBG2("UST app event %s disabled successfully for app (pid: %d)",
442 ua_event
->attr
.name
, app
->key
.pid
);
449 * Disable the specified channel on to UST tracer for the UST session.
451 static int disable_ust_channel(struct ust_app
*app
,
452 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
456 ret
= ustctl_disable(app
->key
.sock
, ua_chan
->obj
);
458 ERR("UST app channel %s disable failed for app (pid: %d) "
459 "and session handle %d with ret %d",
460 ua_chan
->name
, app
->key
.pid
, ua_sess
->handle
, ret
);
464 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
465 ua_chan
->name
, app
->key
.pid
);
472 * Enable the specified channel on to UST tracer for the UST session.
474 static int enable_ust_channel(struct ust_app
*app
,
475 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
479 ret
= ustctl_enable(app
->key
.sock
, ua_chan
->obj
);
481 ERR("UST app channel %s enable failed for app (pid: %d) "
482 "and session handle %d with ret %d",
483 ua_chan
->name
, app
->key
.pid
, ua_sess
->handle
, ret
);
487 ua_chan
->enabled
= 1;
489 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
490 ua_chan
->name
, app
->key
.pid
);
497 * Enable the specified event on to UST tracer for the UST session.
499 static int enable_ust_event(struct ust_app
*app
,
500 struct ust_app_session
*ua_sess
, struct ust_app_event
*ua_event
)
504 ret
= ustctl_enable(app
->key
.sock
, ua_event
->obj
);
506 ERR("UST app event %s enable failed for app (pid: %d) "
507 "and session handle %d with ret %d",
508 ua_event
->attr
.name
, app
->key
.pid
, ua_sess
->handle
, ret
);
512 DBG2("UST app event %s enabled successfully for app (pid: %d)",
513 ua_event
->attr
.name
, app
->key
.pid
);
520 * Open metadata onto the UST tracer for a UST session.
522 static int open_ust_metadata(struct ust_app
*app
,
523 struct ust_app_session
*ua_sess
)
526 struct lttng_ust_channel_attr uattr
;
528 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
529 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
530 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
531 uattr
.switch_timer_interval
=
532 ua_sess
->metadata
->attr
.switch_timer_interval
;
533 uattr
.read_timer_interval
=
534 ua_sess
->metadata
->attr
.read_timer_interval
;
535 uattr
.output
= ua_sess
->metadata
->attr
.output
;
537 /* UST tracer metadata creation */
538 ret
= ustctl_open_metadata(app
->key
.sock
, ua_sess
->handle
, &uattr
,
539 &ua_sess
->metadata
->obj
);
541 ERR("UST app open metadata failed for app pid:%d with ret %d",
546 ua_sess
->metadata
->handle
= ua_sess
->metadata
->obj
->handle
;
553 * Create stream onto the UST tracer for a UST session.
555 static int create_ust_stream(struct ust_app
*app
,
556 struct ust_app_session
*ua_sess
)
560 ret
= ustctl_create_stream(app
->key
.sock
, ua_sess
->metadata
->obj
,
561 &ua_sess
->metadata
->stream_obj
);
563 ERR("UST create metadata stream failed");
572 * Create the specified channel onto the UST tracer for a UST session.
574 static int create_ust_channel(struct ust_app
*app
,
575 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
579 /* TODO: remove cast and use lttng-ust-abi.h */
580 ret
= ustctl_create_channel(app
->key
.sock
, ua_sess
->handle
,
581 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
583 ERR("Creating channel %s for app (pid: %d, sock: %d) "
584 "and session handle %d with ret %d",
585 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
,
586 ua_sess
->handle
, ret
);
590 ua_chan
->handle
= ua_chan
->obj
->handle
;
592 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
593 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
);
595 /* If channel is not enabled, disable it on the tracer */
596 if (!ua_chan
->enabled
) {
597 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
608 * Create the specified event onto the UST tracer for a UST session.
611 int create_ust_event(struct ust_app
*app
, struct ust_app_session
*ua_sess
,
612 struct ust_app_channel
*ua_chan
, struct ust_app_event
*ua_event
)
616 /* Create UST event on tracer */
617 ret
= ustctl_create_event(app
->key
.sock
, &ua_event
->attr
, ua_chan
->obj
,
620 if (ret
== -EEXIST
) {
624 ERR("Error ustctl create event %s for app pid: %d with ret %d",
625 ua_event
->attr
.name
, app
->key
.pid
, ret
);
629 ua_event
->handle
= ua_event
->obj
->handle
;
631 DBG2("UST app event %s created successfully for pid:%d",
632 ua_event
->attr
.name
, app
->key
.pid
);
634 /* If event not enabled, disable it on the tracer */
635 if (ua_event
->enabled
== 0) {
636 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
639 * If we hit an EPERM, something is wrong with our disable call. If
640 * we get an EEXIST, there is a problem on the tracer side since we
645 /* Code flow problem */
648 /* It's OK for our use case. */
663 * Copy data between an UST app event and a LTT event.
665 static void shadow_copy_event(struct ust_app_event
*ua_event
,
666 struct ltt_ust_event
*uevent
)
668 struct lttng_ht_iter iter
;
669 struct ltt_ust_context
*uctx
;
670 struct ust_app_ctx
*ua_ctx
;
672 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
673 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
675 ua_event
->enabled
= uevent
->enabled
;
677 /* Copy event attributes */
678 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
680 cds_lfht_for_each_entry(uevent
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
681 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
682 if (ua_ctx
== NULL
) {
683 /* malloc() failed. We should simply stop */
687 lttng_ht_node_init_ulong(&ua_ctx
->node
,
688 (unsigned long) ua_ctx
->ctx
.ctx
);
689 lttng_ht_add_unique_ulong(ua_event
->ctx
, &ua_ctx
->node
);
694 * Copy data between an UST app channel and a LTT channel.
696 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
697 struct ltt_ust_channel
*uchan
)
699 struct lttng_ht_iter iter
;
700 struct lttng_ht_node_str
*ua_event_node
;
701 struct ltt_ust_event
*uevent
;
702 struct ltt_ust_context
*uctx
;
703 struct ust_app_event
*ua_event
;
704 struct ust_app_ctx
*ua_ctx
;
706 DBG2("UST app shadow copy of channel %s started", ua_chan
->name
);
708 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
709 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
710 /* Copy event attributes */
711 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
713 ua_chan
->enabled
= uchan
->enabled
;
715 cds_lfht_for_each_entry(uchan
->ctx
->ht
, &iter
.iter
, uctx
, node
.node
) {
716 ua_ctx
= alloc_ust_app_ctx(&uctx
->ctx
);
717 if (ua_ctx
== NULL
) {
720 lttng_ht_node_init_ulong(&ua_ctx
->node
,
721 (unsigned long) ua_ctx
->ctx
.ctx
);
722 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
725 /* Copy all events from ltt ust channel to ust app channel */
726 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
727 struct lttng_ht_iter uiter
;
729 lttng_ht_lookup(ua_chan
->events
, (void *) uevent
->attr
.name
, &uiter
);
730 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
731 if (ua_event_node
== NULL
) {
732 DBG2("UST event %s not found on shadow copy channel",
734 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
735 if (ua_event
== NULL
) {
738 shadow_copy_event(ua_event
, uevent
);
739 lttng_ht_add_unique_str(ua_chan
->events
, &ua_event
->node
);
743 DBG3("UST app shadow copy of channel %s done", ua_chan
->name
);
747 * Copy data between a UST app session and a regular LTT session.
749 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
750 struct ltt_ust_session
*usess
, struct ust_app
*app
)
752 struct lttng_ht_node_str
*ua_chan_node
;
753 struct lttng_ht_iter iter
;
754 struct ltt_ust_channel
*uchan
;
755 struct ust_app_channel
*ua_chan
;
761 /* Get date and time for unique app path */
763 timeinfo
= localtime(&rawtime
);
764 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
766 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
768 ua_sess
->id
= usess
->id
;
769 ua_sess
->uid
= usess
->uid
;
770 ua_sess
->gid
= usess
->gid
;
772 ret
= snprintf(ua_sess
->path
, PATH_MAX
, "%s/%s-%d-%s", usess
->pathname
,
773 app
->name
, app
->key
.pid
, datetime
);
775 PERROR("asprintf UST shadow copy session");
776 /* TODO: We cannot return an error from here.. */
780 /* TODO: support all UST domain */
782 /* Iterate over all channels in global domain. */
783 cds_lfht_for_each_entry(usess
->domain_global
.channels
->ht
, &iter
.iter
,
785 struct lttng_ht_iter uiter
;
787 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
788 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
789 if (ua_chan_node
!= NULL
) {
790 /* Session exist. Contiuing. */
794 DBG2("Channel %s not found on shadow session copy, creating it",
796 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
797 if (ua_chan
== NULL
) {
798 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
802 shadow_copy_channel(ua_chan
, uchan
);
803 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
808 * Lookup sesison wrapper.
811 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
812 struct ust_app
*app
, struct lttng_ht_iter
*iter
)
814 /* Get right UST app session from app */
815 lttng_ht_lookup(app
->sessions
, (void *)((unsigned long) usess
->id
), iter
);
819 * Return ust app session from the app session hashtable using the UST session
822 static struct ust_app_session
*lookup_session_by_app(
823 struct ltt_ust_session
*usess
, struct ust_app
*app
)
825 struct lttng_ht_iter iter
;
826 struct lttng_ht_node_ulong
*node
;
828 __lookup_session_by_app(usess
, app
, &iter
);
829 node
= lttng_ht_iter_get_node_ulong(&iter
);
834 return caa_container_of(node
, struct ust_app_session
, node
);
841 * Create a UST session onto the tracer of app and add it the session
844 * Return ust app session or NULL on error.
846 static struct ust_app_session
*create_ust_app_session(
847 struct ltt_ust_session
*usess
, struct ust_app
*app
)
850 struct ust_app_session
*ua_sess
;
852 ua_sess
= lookup_session_by_app(usess
, app
);
853 if (ua_sess
== NULL
) {
854 DBG2("UST app pid: %d session id %d not found, creating it",
855 app
->key
.pid
, usess
->id
);
856 ua_sess
= alloc_ust_app_session();
857 if (ua_sess
== NULL
) {
858 /* Only malloc can failed so something is really wrong */
861 shadow_copy_session(ua_sess
, usess
, app
);
864 if (ua_sess
->handle
== -1) {
865 ret
= ustctl_create_session(app
->key
.sock
);
867 ERR("Creating session for app pid %d", app
->key
.pid
);
871 ua_sess
->handle
= ret
;
873 /* Add ust app session to app's HT */
874 lttng_ht_node_init_ulong(&ua_sess
->node
, (unsigned long) ua_sess
->id
);
875 lttng_ht_add_unique_ulong(app
->sessions
, &ua_sess
->node
);
877 DBG2("UST app session created successfully with handle %d", ret
);
884 delete_ust_app_session(-1, ua_sess
);
889 * Create a context for the channel on the tracer.
892 int create_ust_app_channel_context(struct ust_app_session
*ua_sess
,
893 struct ust_app_channel
*ua_chan
, struct lttng_ust_context
*uctx
,
897 struct lttng_ht_iter iter
;
898 struct lttng_ht_node_ulong
*node
;
899 struct ust_app_ctx
*ua_ctx
;
901 DBG2("UST app adding context to channel %s", ua_chan
->name
);
903 lttng_ht_lookup(ua_chan
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
904 node
= lttng_ht_iter_get_node_ulong(&iter
);
910 ua_ctx
= alloc_ust_app_ctx(uctx
);
911 if (ua_ctx
== NULL
) {
917 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
918 lttng_ht_add_unique_ulong(ua_chan
->ctx
, &ua_ctx
->node
);
920 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
930 * Create an UST context and enable it for the event on the tracer.
933 int create_ust_app_event_context(struct ust_app_session
*ua_sess
,
934 struct ust_app_event
*ua_event
, struct lttng_ust_context
*uctx
,
938 struct lttng_ht_iter iter
;
939 struct lttng_ht_node_ulong
*node
;
940 struct ust_app_ctx
*ua_ctx
;
942 DBG2("UST app adding context to event %s", ua_event
->name
);
944 lttng_ht_lookup(ua_event
->ctx
, (void *)((unsigned long)uctx
->ctx
), &iter
);
945 node
= lttng_ht_iter_get_node_ulong(&iter
);
951 ua_ctx
= alloc_ust_app_ctx(uctx
);
952 if (ua_ctx
== NULL
) {
958 lttng_ht_node_init_ulong(&ua_ctx
->node
, (unsigned long) ua_ctx
->ctx
.ctx
);
959 lttng_ht_add_unique_ulong(ua_event
->ctx
, &ua_ctx
->node
);
961 ret
= create_ust_event_context(ua_event
, ua_ctx
, app
);
971 * Enable on the tracer side a ust app event for the session and channel.
974 int enable_ust_app_event(struct ust_app_session
*ua_sess
,
975 struct ust_app_event
*ua_event
, struct ust_app
*app
)
979 ret
= enable_ust_event(app
, ua_sess
, ua_event
);
984 ua_event
->enabled
= 1;
991 * Disable on the tracer side a ust app event for the session and channel.
993 static int disable_ust_app_event(struct ust_app_session
*ua_sess
,
994 struct ust_app_event
*ua_event
, struct ust_app
*app
)
998 ret
= disable_ust_event(app
, ua_sess
, ua_event
);
1003 ua_event
->enabled
= 0;
1010 * Lookup ust app channel for session and disable it on the tracer side.
1013 int disable_ust_app_channel(struct ust_app_session
*ua_sess
,
1014 struct ust_app_channel
*ua_chan
, struct ust_app
*app
)
1018 ret
= disable_ust_channel(app
, ua_sess
, ua_chan
);
1023 ua_chan
->enabled
= 0;
1030 * Lookup ust app channel for session and enable it on the tracer side.
1032 static int enable_ust_app_channel(struct ust_app_session
*ua_sess
,
1033 struct ltt_ust_channel
*uchan
, struct ust_app
*app
)
1036 struct lttng_ht_iter iter
;
1037 struct lttng_ht_node_str
*ua_chan_node
;
1038 struct ust_app_channel
*ua_chan
;
1040 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1041 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1042 if (ua_chan_node
== NULL
) {
1043 DBG2("Unable to find channel %s in ust session id %u",
1044 uchan
->name
, ua_sess
->id
);
1048 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1050 ret
= enable_ust_channel(app
, ua_sess
, ua_chan
);
1060 * Create UST app channel and create it on the tracer.
1062 static struct ust_app_channel
*create_ust_app_channel(
1063 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
1064 struct ust_app
*app
)
1067 struct lttng_ht_iter iter
;
1068 struct lttng_ht_node_str
*ua_chan_node
;
1069 struct ust_app_channel
*ua_chan
;
1071 /* Lookup channel in the ust app session */
1072 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
1073 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
1074 if (ua_chan_node
!= NULL
) {
1075 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1079 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
1080 if (ua_chan
== NULL
) {
1081 /* Only malloc can fail here */
1084 shadow_copy_channel(ua_chan
, uchan
);
1086 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1088 /* Not found previously means that it does not exist on the tracer */
1089 assert(ret
!= -EEXIST
);
1093 lttng_ht_add_unique_str(ua_sess
->channels
, &ua_chan
->node
);
1095 DBG2("UST app create channel %s for PID %d completed", ua_chan
->name
,
1102 delete_ust_app_channel(-1, ua_chan
);
1107 * Create UST app event and create it on the tracer side.
1110 int create_ust_app_event(struct ust_app_session
*ua_sess
,
1111 struct ust_app_channel
*ua_chan
, struct ltt_ust_event
*uevent
,
1112 struct ust_app
*app
)
1115 struct lttng_ht_iter iter
;
1116 struct lttng_ht_node_str
*ua_event_node
;
1117 struct ust_app_event
*ua_event
;
1119 /* Get event node */
1120 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
1121 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
1122 if (ua_event_node
!= NULL
) {
1127 /* Does not exist so create one */
1128 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
1129 if (ua_event
== NULL
) {
1130 /* Only malloc can failed so something is really wrong */
1134 shadow_copy_event(ua_event
, uevent
);
1136 /* Create it on the tracer side */
1137 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1139 /* Not found previously means that it does not exist on the tracer */
1140 assert(ret
!= -EEXIST
);
1144 lttng_ht_add_unique_str(ua_chan
->events
, &ua_event
->node
);
1146 DBG2("UST app create event %s for PID %d completed", ua_event
->name
,
1153 /* Valid. Calling here is already in a read side lock */
1154 delete_ust_app_event(-1, ua_event
);
1159 * Create UST metadata and open it on the tracer side.
1161 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
1162 char *pathname
, struct ust_app
*app
)
1166 if (ua_sess
->metadata
== NULL
) {
1167 /* Allocate UST metadata */
1168 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
1169 if (ua_sess
->metadata
== NULL
) {
1170 /* malloc() failed */
1174 ret
= open_ust_metadata(app
, ua_sess
);
1176 DBG3("Opening metadata failed. Cleaning up memory");
1178 /* Cleanup failed metadata struct */
1179 free(ua_sess
->metadata
);
1181 * This is very important because delete_ust_app_session check if
1182 * the pointer is null or not in order to delete the metadata.
1184 ua_sess
->metadata
= NULL
;
1188 DBG2("UST metadata opened for app pid %d", app
->key
.pid
);
1191 /* Open UST metadata stream */
1192 if (ua_sess
->metadata
->stream_obj
== NULL
) {
1193 ret
= create_ust_stream(app
, ua_sess
);
1198 ret
= run_as_mkdir(ua_sess
->path
, S_IRWXU
| S_IRWXG
,
1199 ua_sess
->uid
, ua_sess
->gid
);
1201 PERROR("mkdir UST metadata");
1205 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
1206 "%s/metadata", ua_sess
->path
);
1208 PERROR("asprintf UST create stream");
1212 DBG2("UST metadata stream object created for app pid %d",
1215 ERR("Attempting to create stream without metadata opened");
1226 * Return pointer to traceable apps list.
1228 struct lttng_ht
*ust_app_get_ht(void)
1234 * Return ust app pointer or NULL if not found.
1236 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
1238 struct lttng_ht_node_ulong
*node
;
1239 struct lttng_ht_iter iter
;
1242 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) pid
), &iter
);
1243 node
= lttng_ht_iter_get_node_ulong(&iter
);
1245 DBG2("UST app no found with pid %d", pid
);
1250 DBG2("Found UST app by pid %d", pid
);
1252 return caa_container_of(node
, struct ust_app
, node
);
1260 * Using pid and uid (of the app), allocate a new ust_app struct and
1261 * add it to the global traceable app list.
1263 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1264 * bitness is not supported.
1266 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
1268 struct ust_app
*lta
;
1270 if ((msg
->bits_per_long
== 64 && ust_consumerd64_fd
== -EINVAL
)
1271 || (msg
->bits_per_long
== 32 && ust_consumerd32_fd
== -EINVAL
)) {
1272 ERR("Registration failed: application \"%s\" (pid: %d) has "
1273 "%d-bit long, but no consumerd for this long size is available.\n",
1274 msg
->name
, msg
->pid
, msg
->bits_per_long
);
1278 if (msg
->major
!= LTTNG_UST_COMM_MAJOR
) {
1279 ERR("Registration failed: application \"%s\" (pid: %d) has "
1280 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1281 msg
->name
, msg
->pid
, msg
->major
, msg
->minor
);
1285 lta
= zmalloc(sizeof(struct ust_app
));
1291 lta
->ppid
= msg
->ppid
;
1292 lta
->uid
= msg
->uid
;
1293 lta
->gid
= msg
->gid
;
1294 lta
->compatible
= 0; /* Not compatible until proven */
1295 lta
->bits_per_long
= msg
->bits_per_long
;
1296 lta
->v_major
= msg
->major
;
1297 lta
->v_minor
= msg
->minor
;
1298 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
1299 lta
->name
[16] = '\0';
1300 lta
->sessions
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1303 lta
->key
.pid
= msg
->pid
;
1304 lttng_ht_node_init_ulong(<a
->node
, (unsigned long)lta
->key
.pid
);
1305 lta
->key
.sock
= sock
;
1306 lttng_ht_node_init_ulong(<a
->key
.node
, (unsigned long)lta
->key
.sock
);
1309 lttng_ht_add_unique_ulong(ust_app_sock_key_map
, <a
->key
.node
);
1310 lttng_ht_add_unique_ulong(ust_app_ht
, <a
->node
);
1313 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1314 " (version %d.%d)", lta
->key
.pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
1315 lta
->key
.sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
1321 * Unregister app by removing it from the global traceable app list and freeing
1324 * The socket is already closed at this point so no close to sock.
1326 void ust_app_unregister(int sock
)
1328 struct ust_app
*lta
;
1329 struct lttng_ht_node_ulong
*node
;
1330 struct lttng_ht_iter iter
;
1334 lta
= find_app_by_sock(sock
);
1336 ERR("Unregister app sock %d not found!", sock
);
1340 DBG("PID %d unregistering with sock %d", lta
->key
.pid
, sock
);
1342 /* Remove application from socket hash table */
1343 lttng_ht_lookup(ust_app_sock_key_map
, (void *)((unsigned long) sock
), &iter
);
1344 ret
= lttng_ht_del(ust_app_sock_key_map
, &iter
);
1347 /* Get the node reference for a call_rcu */
1348 lttng_ht_lookup(ust_app_ht
, (void *)((unsigned long) lta
->key
.pid
), &iter
);
1349 node
= lttng_ht_iter_get_node_ulong(&iter
);
1351 ERR("Unable to find app sock %d by pid %d", sock
, lta
->key
.pid
);
1355 /* Remove application from PID hash table */
1356 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1358 call_rcu(&node
->head
, delete_ust_app_rcu
);
1365 * Return traceable_app_count
1367 unsigned long ust_app_list_count(void)
1369 unsigned long count
;
1372 count
= lttng_ht_get_count(ust_app_ht
);
1379 * Fill events array with all events name of all registered apps.
1381 int ust_app_list_events(struct lttng_event
**events
)
1384 size_t nbmem
, count
= 0;
1385 struct lttng_ht_iter iter
;
1386 struct ust_app
*app
;
1387 struct lttng_event
*tmp
;
1389 nbmem
= UST_APP_EVENT_LIST_SIZE
;
1390 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
1392 PERROR("zmalloc ust app events");
1399 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1400 struct lttng_ust_tracepoint_iter uiter
;
1402 if (!app
->compatible
) {
1404 * TODO: In time, we should notice the caller of this error by
1405 * telling him that this is a version error.
1409 handle
= ustctl_tracepoint_list(app
->key
.sock
);
1411 ERR("UST app list events getting handle failed for app pid %d",
1416 while ((ret
= ustctl_tracepoint_list_get(app
->key
.sock
, handle
,
1417 &uiter
)) != -ENOENT
) {
1418 if (count
>= nbmem
) {
1419 DBG2("Reallocating event list from %zu to %zu entries", nbmem
,
1422 tmp
= realloc(tmp
, nbmem
* sizeof(struct lttng_event
));
1424 PERROR("realloc ust app events");
1429 memcpy(tmp
[count
].name
, uiter
.name
, LTTNG_UST_SYM_NAME_LEN
);
1430 tmp
[count
].loglevel
= uiter
.loglevel
;
1431 tmp
[count
].type
= LTTNG_UST_TRACEPOINT
;
1432 tmp
[count
].pid
= app
->key
.pid
;
1433 tmp
[count
].enabled
= -1;
1441 DBG2("UST app list events done (%zu events)", count
);
1450 * Free and clean all traceable apps of the global list.
1452 void ust_app_clean_list(void)
1455 struct lttng_ht_iter iter
;
1456 struct lttng_ht_node_ulong
*node
;
1458 DBG2("UST app cleaning registered apps hash table");
1462 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, node
, node
) {
1463 ret
= lttng_ht_del(ust_app_ht
, &iter
);
1465 call_rcu(&node
->head
, delete_ust_app_rcu
);
1467 /* Destroy is done only when the ht is empty */
1468 lttng_ht_destroy(ust_app_ht
);
1470 cds_lfht_for_each_entry(ust_app_sock_key_map
->ht
, &iter
.iter
, node
, node
) {
1471 ret
= lttng_ht_del(ust_app_sock_key_map
, &iter
);
1474 /* Destroy is done only when the ht is empty */
1475 lttng_ht_destroy(ust_app_sock_key_map
);
1481 * Init UST app hash table.
1483 void ust_app_ht_alloc(void)
1485 ust_app_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1486 ust_app_sock_key_map
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1490 * For a specific UST session, disable the channel for all registered apps.
1492 int ust_app_disable_channel_glb(struct ltt_ust_session
*usess
,
1493 struct ltt_ust_channel
*uchan
)
1496 struct lttng_ht_iter iter
;
1497 struct lttng_ht_node_str
*ua_chan_node
;
1498 struct ust_app
*app
;
1499 struct ust_app_session
*ua_sess
;
1500 struct ust_app_channel
*ua_chan
;
1502 if (usess
== NULL
|| uchan
== NULL
) {
1503 ERR("Disabling UST global channel with NULL values");
1508 DBG2("UST app disabling channel %s from global domain for session id %d",
1509 uchan
->name
, usess
->id
);
1513 /* For every registered applications */
1514 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1515 struct lttng_ht_iter uiter
;
1516 if (!app
->compatible
) {
1518 * TODO: In time, we should notice the caller of this error by
1519 * telling him that this is a version error.
1523 ua_sess
= lookup_session_by_app(usess
, app
);
1524 if (ua_sess
== NULL
) {
1529 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1530 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1531 /* If the session if found for the app, the channel must be there */
1532 assert(ua_chan_node
);
1534 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1535 /* The channel must not be already disabled */
1536 assert(ua_chan
->enabled
== 1);
1538 /* Disable channel onto application */
1539 ret
= disable_ust_app_channel(ua_sess
, ua_chan
, app
);
1541 /* XXX: We might want to report this error at some point... */
1553 * For a specific UST session, enable the channel for all registered apps.
1555 int ust_app_enable_channel_glb(struct ltt_ust_session
*usess
,
1556 struct ltt_ust_channel
*uchan
)
1559 struct lttng_ht_iter iter
;
1560 struct ust_app
*app
;
1561 struct ust_app_session
*ua_sess
;
1563 if (usess
== NULL
|| uchan
== NULL
) {
1564 ERR("Adding UST global channel to NULL values");
1569 DBG2("UST app enabling channel %s to global domain for session id %d",
1570 uchan
->name
, usess
->id
);
1574 /* For every registered applications */
1575 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1576 if (!app
->compatible
) {
1578 * TODO: In time, we should notice the caller of this error by
1579 * telling him that this is a version error.
1583 ua_sess
= lookup_session_by_app(usess
, app
);
1584 if (ua_sess
== NULL
) {
1588 /* Enable channel onto application */
1589 ret
= enable_ust_app_channel(ua_sess
, uchan
, app
);
1591 /* XXX: We might want to report this error at some point... */
1603 * Disable an event in a channel and for a specific session.
1605 int ust_app_disable_event_glb(struct ltt_ust_session
*usess
,
1606 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1609 struct lttng_ht_iter iter
, uiter
;
1610 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1611 struct ust_app
*app
;
1612 struct ust_app_session
*ua_sess
;
1613 struct ust_app_channel
*ua_chan
;
1614 struct ust_app_event
*ua_event
;
1616 DBG("UST app disabling event %s for all apps in channel "
1617 "%s for session id %d", uevent
->attr
.name
, uchan
->name
, usess
->id
);
1621 /* For all registered applications */
1622 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1623 if (!app
->compatible
) {
1625 * TODO: In time, we should notice the caller of this error by
1626 * telling him that this is a version error.
1630 ua_sess
= lookup_session_by_app(usess
, app
);
1631 if (ua_sess
== NULL
) {
1636 /* Lookup channel in the ust app session */
1637 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1638 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1639 if (ua_chan_node
== NULL
) {
1640 DBG2("Channel %s not found in session id %d for app pid %d."
1641 "Skipping", uchan
->name
, usess
->id
, app
->key
.pid
);
1644 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1646 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
1647 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1648 if (ua_event_node
== NULL
) {
1649 DBG2("Event %s not found in channel %s for app pid %d."
1650 "Skipping", uevent
->attr
.name
, uchan
->name
, app
->key
.pid
);
1653 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1655 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1657 /* XXX: Report error someday... */
1668 * For a specific UST session and UST channel, the event for all
1671 int ust_app_disable_all_event_glb(struct ltt_ust_session
*usess
,
1672 struct ltt_ust_channel
*uchan
)
1675 struct lttng_ht_iter iter
, uiter
;
1676 struct lttng_ht_node_str
*ua_chan_node
;
1677 struct ust_app
*app
;
1678 struct ust_app_session
*ua_sess
;
1679 struct ust_app_channel
*ua_chan
;
1680 struct ust_app_event
*ua_event
;
1682 DBG("UST app disabling all event for all apps in channel "
1683 "%s for session id %d", uchan
->name
, usess
->id
);
1687 /* For all registered applications */
1688 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1689 if (!app
->compatible
) {
1691 * TODO: In time, we should notice the caller of this error by
1692 * telling him that this is a version error.
1696 ua_sess
= lookup_session_by_app(usess
, app
);
1697 /* If ua_sess is NULL, there is a code flow error */
1700 /* Lookup channel in the ust app session */
1701 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1702 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1703 /* If the channel is not found, there is a code flow error */
1704 assert(ua_chan_node
);
1706 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1708 /* Disable each events of channel */
1709 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
1711 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
1713 /* XXX: Report error someday... */
1725 * For a specific UST session, create the channel for all registered apps.
1727 int ust_app_create_channel_glb(struct ltt_ust_session
*usess
,
1728 struct ltt_ust_channel
*uchan
)
1730 struct lttng_ht_iter iter
;
1731 struct ust_app
*app
;
1732 struct ust_app_session
*ua_sess
;
1733 struct ust_app_channel
*ua_chan
;
1735 /* Very wrong code flow */
1739 DBG2("UST app adding channel %s to global domain for session id %d",
1740 uchan
->name
, usess
->id
);
1744 /* For every registered applications */
1745 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1746 if (!app
->compatible
) {
1748 * TODO: In time, we should notice the caller of this error by
1749 * telling him that this is a version error.
1754 * Create session on the tracer side and add it to app session HT. Note
1755 * that if session exist, it will simply return a pointer to the ust
1758 ua_sess
= create_ust_app_session(usess
, app
);
1759 if (ua_sess
== NULL
) {
1760 /* Major problem here and it's maybe the tracer or malloc() */
1764 /* Create channel onto application */
1765 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
1766 if (ua_chan
== NULL
) {
1767 /* Major problem here and it's maybe the tracer or malloc() */
1781 * Enable event for a specific session and channel on the tracer.
1783 int ust_app_enable_event_glb(struct ltt_ust_session
*usess
,
1784 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1787 struct lttng_ht_iter iter
, uiter
;
1788 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
1789 struct ust_app
*app
;
1790 struct ust_app_session
*ua_sess
;
1791 struct ust_app_channel
*ua_chan
;
1792 struct ust_app_event
*ua_event
;
1794 DBG("UST app enabling event %s for all apps for session id %d",
1795 uevent
->attr
.name
, usess
->id
);
1798 * NOTE: At this point, this function is called only if the session and
1799 * channel passed are already created for all apps. and enabled on the
1805 /* For all registered applications */
1806 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1807 if (!app
->compatible
) {
1809 * TODO: In time, we should notice the caller of this error by
1810 * telling him that this is a version error.
1814 ua_sess
= lookup_session_by_app(usess
, app
);
1815 /* If ua_sess is NULL, there is a code flow error */
1818 /* Lookup channel in the ust app session */
1819 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1820 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1821 /* If the channel is not found, there is a code flow error */
1822 assert(ua_chan_node
);
1824 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1826 lttng_ht_lookup(ua_chan
->events
, (void*)uevent
->attr
.name
, &uiter
);
1827 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
1828 if (ua_event_node
== NULL
) {
1829 DBG3("UST app enable event %s not found for app PID %d."
1830 "Skipping app", uevent
->attr
.name
, app
->key
.pid
);
1833 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
1835 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
1847 * For a specific existing UST session and UST channel, creates the event for
1848 * all registered apps.
1850 int ust_app_create_event_glb(struct ltt_ust_session
*usess
,
1851 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1854 struct lttng_ht_iter iter
, uiter
;
1855 struct lttng_ht_node_str
*ua_chan_node
;
1856 struct ust_app
*app
;
1857 struct ust_app_session
*ua_sess
;
1858 struct ust_app_channel
*ua_chan
;
1860 DBG("UST app creating event %s for all apps for session id %d",
1861 uevent
->attr
.name
, usess
->id
);
1865 /* For all registered applications */
1866 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
1867 if (!app
->compatible
) {
1869 * TODO: In time, we should notice the caller of this error by
1870 * telling him that this is a version error.
1874 ua_sess
= lookup_session_by_app(usess
, app
);
1875 /* If ua_sess is NULL, there is a code flow error */
1878 /* Lookup channel in the ust app session */
1879 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
1880 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
1881 /* If the channel is not found, there is a code flow error */
1882 assert(ua_chan_node
);
1884 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1886 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
1888 if (ret
!= -EEXIST
) {
1889 /* Possible value at this point: -ENOMEM. If so, we stop! */
1892 DBG2("UST app event %s already exist on app PID %d",
1893 uevent
->attr
.name
, app
->key
.pid
);
1904 * Start tracing for a specific UST session and app.
1906 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1909 struct lttng_ht_iter iter
;
1910 struct ust_app_session
*ua_sess
;
1911 struct ust_app_channel
*ua_chan
;
1912 struct ltt_ust_stream
*ustream
;
1915 DBG("Starting tracing for ust app pid %d", app
->key
.pid
);
1919 if (!app
->compatible
) {
1923 ua_sess
= lookup_session_by_app(usess
, app
);
1924 if (ua_sess
== NULL
) {
1925 goto error_rcu_unlock
;
1928 /* Upon restart, we skip the setup, already done */
1929 if (ua_sess
->started
) {
1933 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
1935 goto error_rcu_unlock
;
1938 /* For each channel */
1939 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
1941 /* Create all streams */
1943 /* Create UST stream */
1944 ustream
= zmalloc(sizeof(*ustream
));
1945 if (ustream
== NULL
) {
1946 PERROR("zmalloc ust stream");
1947 goto error_rcu_unlock
;
1950 ret
= ustctl_create_stream(app
->key
.sock
, ua_chan
->obj
,
1953 /* Got all streams */
1956 ustream
->handle
= ustream
->obj
->handle
;
1958 /* Order is important */
1959 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
1960 ret
= snprintf(ustream
->pathname
, PATH_MAX
, "%s/%s_%u",
1961 ua_sess
->path
, ua_chan
->name
,
1962 ua_chan
->streams
.count
++);
1964 PERROR("asprintf UST create stream");
1967 DBG2("UST stream %d ready at %s", ua_chan
->streams
.count
,
1972 switch (app
->bits_per_long
) {
1974 consumerd_fd
= ust_consumerd64_fd
;
1977 consumerd_fd
= ust_consumerd32_fd
;
1981 goto error_rcu_unlock
;
1984 /* Setup UST consumer socket and send fds to it */
1985 ret
= ust_consumer_send_session(consumerd_fd
, ua_sess
);
1987 goto error_rcu_unlock
;
1989 ua_sess
->started
= 1;
1992 /* This start the UST tracing */
1993 ret
= ustctl_start_session(app
->key
.sock
, ua_sess
->handle
);
1995 ERR("Error starting tracing for app pid: %d", app
->key
.pid
);
1996 goto error_rcu_unlock
;
1999 /* Quiescent wait after starting trace */
2000 ustctl_wait_quiescent(app
->key
.sock
);
2012 * Stop tracing for a specific UST session and app.
2014 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2017 struct lttng_ht_iter iter
;
2018 struct ust_app_session
*ua_sess
;
2019 struct ust_app_channel
*ua_chan
;
2021 DBG("Stopping tracing for ust app pid %d", app
->key
.pid
);
2025 if (!app
->compatible
) {
2029 ua_sess
= lookup_session_by_app(usess
, app
);
2030 if (ua_sess
== NULL
) {
2031 /* Only malloc can failed so something is really wrong */
2032 goto error_rcu_unlock
;
2035 /* Not started, continuing. */
2036 if (ua_sess
->started
== 0) {
2040 /* This inhibits UST tracing */
2041 ret
= ustctl_stop_session(app
->key
.sock
, ua_sess
->handle
);
2043 ERR("Error stopping tracing for app pid: %d", app
->key
.pid
);
2044 goto error_rcu_unlock
;
2047 /* Quiescent wait after stopping trace */
2048 ustctl_wait_quiescent(app
->key
.sock
);
2050 /* Flushing buffers */
2051 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2053 ret
= ustctl_sock_flush_buffer(app
->key
.sock
, ua_chan
->obj
);
2055 ERR("UST app PID %d channel %s flush failed with ret %d",
2056 app
->key
.pid
, ua_chan
->name
, ret
);
2057 /* Continuing flushing all buffers */
2062 /* Flush all buffers before stopping */
2063 ret
= ustctl_sock_flush_buffer(app
->key
.sock
, ua_sess
->metadata
->obj
);
2065 ERR("UST app PID %d metadata flush failed with ret %d", app
->key
.pid
,
2069 ua_sess
->started
= 0;
2081 * Destroy a specific UST session in apps.
2083 int ust_app_destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
2085 struct ust_app_session
*ua_sess
;
2086 struct lttng_ust_object_data obj
;
2087 struct lttng_ht_iter iter
;
2088 struct lttng_ht_node_ulong
*node
;
2091 DBG("Destroy tracing for ust app pid %d", app
->key
.pid
);
2095 if (!app
->compatible
) {
2099 __lookup_session_by_app(usess
, app
, &iter
);
2100 node
= lttng_ht_iter_get_node_ulong(&iter
);
2102 /* Only malloc can failed so something is really wrong */
2103 goto error_rcu_unlock
;
2105 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
2106 ret
= lttng_ht_del(app
->sessions
, &iter
);
2108 obj
.handle
= ua_sess
->handle
;
2111 obj
.memory_map_size
= 0;
2112 ustctl_release_object(app
->key
.sock
, &obj
);
2114 delete_ust_app_session(app
->key
.sock
, ua_sess
);
2116 /* Quiescent wait after stopping trace */
2117 ustctl_wait_quiescent(app
->key
.sock
);
2129 * Start tracing for the UST session.
2131 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
2134 struct lttng_ht_iter iter
;
2135 struct ust_app
*app
;
2137 DBG("Starting all UST traces");
2141 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2142 ret
= ust_app_start_trace(usess
, app
);
2144 /* Continue to next apps even on error */
2155 * Start tracing for the UST session.
2157 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
2160 struct lttng_ht_iter iter
;
2161 struct ust_app
*app
;
2163 DBG("Stopping all UST traces");
2167 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2168 ret
= ust_app_stop_trace(usess
, app
);
2170 /* Continue to next apps even on error */
2181 * Destroy app UST session.
2183 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
2186 struct lttng_ht_iter iter
;
2187 struct ust_app
*app
;
2189 DBG("Destroy all UST traces");
2193 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2194 ret
= ust_app_destroy_trace(usess
, app
);
2196 /* Continue to next apps even on error */
2207 * Add channels/events from UST global domain to registered apps at sock.
2209 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
2212 struct lttng_ht_iter iter
, uiter
, iter_ctx
;
2213 struct ust_app
*app
;
2214 struct ust_app_session
*ua_sess
;
2215 struct ust_app_channel
*ua_chan
;
2216 struct ust_app_event
*ua_event
;
2217 struct ust_app_ctx
*ua_ctx
;
2219 if (usess
== NULL
) {
2220 ERR("No UST session on global update. Returning");
2224 DBG2("UST app global update for app sock %d for session id %d", sock
,
2229 app
= find_app_by_sock(sock
);
2231 ERR("Failed to update app sock %d", sock
);
2235 if (!app
->compatible
) {
2239 ua_sess
= create_ust_app_session(usess
, app
);
2240 if (ua_sess
== NULL
) {
2245 * We can iterate safely here over all UST app session sicne the create ust
2246 * app session above made a shadow copy of the UST global domain from the
2249 cds_lfht_for_each_entry(ua_sess
->channels
->ht
, &iter
.iter
, ua_chan
,
2251 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
2253 /* FIXME: Should we quit here or continue... */
2257 cds_lfht_for_each_entry(ua_chan
->ctx
->ht
, &iter_ctx
.iter
, ua_ctx
,
2259 ret
= create_ust_channel_context(ua_chan
, ua_ctx
, app
);
2261 /* FIXME: Should we quit here or continue... */
2267 /* For each events */
2268 cds_lfht_for_each_entry(ua_chan
->events
->ht
, &uiter
.iter
, ua_event
,
2270 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
2272 /* FIXME: Should we quit here or continue... */
2276 /* Add context on events. */
2277 cds_lfht_for_each_entry(ua_event
->ctx
->ht
, &iter_ctx
.iter
,
2278 ua_ctx
, node
.node
) {
2279 ret
= create_ust_event_context(ua_event
, ua_ctx
, app
);
2281 /* FIXME: Should we quit here or continue... */
2288 if (usess
->start_trace
) {
2289 ret
= ust_app_start_trace(usess
, app
);
2294 DBG2("UST trace started for app pid %d", app
->key
.pid
);
2303 * Add context to a specific channel for global UST domain.
2305 int ust_app_add_ctx_channel_glb(struct ltt_ust_session
*usess
,
2306 struct ltt_ust_channel
*uchan
, struct ltt_ust_context
*uctx
)
2309 struct lttng_ht_node_str
*ua_chan_node
;
2310 struct lttng_ht_iter iter
, uiter
;
2311 struct ust_app_channel
*ua_chan
= NULL
;
2312 struct ust_app_session
*ua_sess
;
2313 struct ust_app
*app
;
2317 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2318 if (!app
->compatible
) {
2320 * TODO: In time, we should notice the caller of this error by
2321 * telling him that this is a version error.
2325 ua_sess
= lookup_session_by_app(usess
, app
);
2326 if (ua_sess
== NULL
) {
2330 /* Lookup channel in the ust app session */
2331 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2332 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2333 if (ua_chan_node
== NULL
) {
2336 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2339 ret
= create_ust_app_channel_context(ua_sess
, ua_chan
, &uctx
->ctx
, app
);
2350 * Add context to a specific event in a channel for global UST domain.
2352 int ust_app_add_ctx_event_glb(struct ltt_ust_session
*usess
,
2353 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
,
2354 struct ltt_ust_context
*uctx
)
2357 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2358 struct lttng_ht_iter iter
, uiter
;
2359 struct ust_app_session
*ua_sess
;
2360 struct ust_app_event
*ua_event
;
2361 struct ust_app_channel
*ua_chan
= NULL
;
2362 struct ust_app
*app
;
2366 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2367 if (!app
->compatible
) {
2369 * TODO: In time, we should notice the caller of this error by
2370 * telling him that this is a version error.
2374 ua_sess
= lookup_session_by_app(usess
, app
);
2375 if (ua_sess
== NULL
) {
2379 /* Lookup channel in the ust app session */
2380 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &uiter
);
2381 ua_chan_node
= lttng_ht_iter_get_node_str(&uiter
);
2382 if (ua_chan_node
== NULL
) {
2385 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
,
2388 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &uiter
);
2389 ua_event_node
= lttng_ht_iter_get_node_str(&uiter
);
2390 if (ua_event_node
== NULL
) {
2393 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
,
2396 ret
= create_ust_app_event_context(ua_sess
, ua_event
, &uctx
->ctx
, app
);
2407 * Enable event for a channel from a UST session for a specific PID.
2409 int ust_app_enable_event_pid(struct ltt_ust_session
*usess
,
2410 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2413 struct lttng_ht_iter iter
;
2414 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2415 struct ust_app
*app
;
2416 struct ust_app_session
*ua_sess
;
2417 struct ust_app_channel
*ua_chan
;
2418 struct ust_app_event
*ua_event
;
2420 DBG("UST app enabling event %s for PID %d", uevent
->attr
.name
, pid
);
2424 app
= ust_app_find_by_pid(pid
);
2426 ERR("UST app enable event per PID %d not found", pid
);
2431 if (!app
->compatible
) {
2436 ua_sess
= lookup_session_by_app(usess
, app
);
2437 /* If ua_sess is NULL, there is a code flow error */
2440 /* Lookup channel in the ust app session */
2441 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2442 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2443 /* If the channel is not found, there is a code flow error */
2444 assert(ua_chan_node
);
2446 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2448 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2449 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2450 if (ua_event_node
== NULL
) {
2451 ret
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
2456 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2458 ret
= enable_ust_app_event(ua_sess
, ua_event
, app
);
2470 * Disable event for a channel from a UST session for a specific PID.
2472 int ust_app_disable_event_pid(struct ltt_ust_session
*usess
,
2473 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
, pid_t pid
)
2476 struct lttng_ht_iter iter
;
2477 struct lttng_ht_node_str
*ua_chan_node
, *ua_event_node
;
2478 struct ust_app
*app
;
2479 struct ust_app_session
*ua_sess
;
2480 struct ust_app_channel
*ua_chan
;
2481 struct ust_app_event
*ua_event
;
2483 DBG("UST app disabling event %s for PID %d", uevent
->attr
.name
, pid
);
2487 app
= ust_app_find_by_pid(pid
);
2489 ERR("UST app disable event per PID %d not found", pid
);
2494 if (!app
->compatible
) {
2499 ua_sess
= lookup_session_by_app(usess
, app
);
2500 /* If ua_sess is NULL, there is a code flow error */
2503 /* Lookup channel in the ust app session */
2504 lttng_ht_lookup(ua_sess
->channels
, (void *)uchan
->name
, &iter
);
2505 ua_chan_node
= lttng_ht_iter_get_node_str(&iter
);
2506 if (ua_chan_node
== NULL
) {
2507 /* Channel does not exist, skip disabling */
2510 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
2512 lttng_ht_lookup(ua_chan
->events
, (void *)uevent
->attr
.name
, &iter
);
2513 ua_event_node
= lttng_ht_iter_get_node_str(&iter
);
2514 if (ua_event_node
== NULL
) {
2515 /* Event does not exist, skip disabling */
2518 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
2520 ret
= disable_ust_app_event(ua_sess
, ua_event
, app
);
2531 * Validate version of UST apps and set the compatible bit.
2533 int ust_app_validate_version(int sock
)
2536 struct ust_app
*app
;
2540 app
= find_app_by_sock(sock
);
2543 ret
= ustctl_tracer_version(sock
, &app
->version
);
2548 /* Validate version */
2549 if (app
->version
.major
> UST_APP_MAJOR_VERSION
) {
2553 DBG2("UST app PID %d is compatible with major version %d "
2554 "(supporting <= %d)", app
->key
.pid
, app
->version
.major
,
2555 UST_APP_MAJOR_VERSION
);
2556 app
->compatible
= 1;
2561 DBG2("UST app PID %d is not compatible with major version %d "
2562 "(supporting <= %d)", app
->key
.pid
, app
->version
.major
,
2563 UST_APP_MAJOR_VERSION
);
2564 app
->compatible
= 0;
2570 * Calibrate registered applications.
2572 int ust_app_calibrate_glb(struct lttng_ust_calibrate
*calibrate
)
2575 struct lttng_ht_iter iter
;
2576 struct ust_app
*app
;
2580 cds_lfht_for_each_entry(ust_app_ht
->ht
, &iter
.iter
, app
, node
.node
) {
2581 if (!app
->compatible
) {
2583 * TODO: In time, we should notice the caller of this error by
2584 * telling him that this is a version error.
2589 ret
= ustctl_calibrate(app
->key
.sock
, calibrate
);
2593 /* Means that it's not implemented on the tracer side. */
2597 /* TODO: Report error to user */
2598 DBG2("Calibrate app PID %d returned with error %d",
2605 DBG("UST app global domain calibration finished");