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>
30 #include <lttng-share.h>
32 #include "hashtable.h"
34 #include "ust-consumer.h"
38 * Delete ust app event safely. RCU read lock must be held before calling
41 static void delete_ust_app_event(int sock
, struct ust_app_event
*ua_event
)
43 /* TODO : remove context */
44 //struct ust_app_ctx *ltctx;
45 //cds_lfht_for_each_entry(lte->ctx, &iter, ltctx, node) {
46 // delete_ust_app_ctx(sock, ltctx);
49 ustctl_release_object(sock
, ua_event
->obj
);
55 * Delete ust app stream safely. RCU read lock must be held before calling
58 static void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
60 ustctl_release_object(sock
, stream
->obj
);
66 * Delete ust app channel safely. RCU read lock must be held before calling
69 static void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
72 struct cds_lfht_iter iter
;
73 struct ust_app_event
*ua_event
;
74 struct ltt_ust_stream
*stream
, *stmp
;
76 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, list
) {
77 cds_list_del(&stream
->list
);
78 delete_ust_app_stream(sock
, stream
);
81 /* TODO : remove channel context */
82 //cds_lfht_for_each_entry(ltc->ctx, &iter, ltctx, node) {
83 // hashtable_del(ltc->ctx, &iter);
84 // delete_ust_app_ctx(sock, ltctx);
86 //ret = hashtable_destroy(ltc->ctx);
88 cds_lfht_for_each_entry(ua_chan
->events
, &iter
, ua_event
, node
) {
89 hashtable_del(ua_chan
->events
, &iter
);
90 delete_ust_app_event(sock
, ua_event
);
93 ret
= hashtable_destroy(ua_chan
->events
);
95 ERR("UST app destroy session hashtable failed");
98 ustctl_release_object(sock
, ua_chan
->obj
);
107 * Delete ust app session safely. RCU read lock must be held before calling
110 static void delete_ust_app_session(int sock
,
111 struct ust_app_session
*ua_sess
)
114 struct cds_lfht_iter iter
;
115 struct ust_app_channel
*ua_chan
;
117 if (ua_sess
->metadata
) {
118 ustctl_release_object(sock
, ua_sess
->metadata
->stream_obj
);
119 free(ua_sess
->metadata
->stream_obj
);
120 ustctl_release_object(sock
, ua_sess
->metadata
->obj
);
121 free(ua_sess
->metadata
->obj
);
124 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
125 hashtable_del(ua_sess
->channels
, &iter
);
126 delete_ust_app_channel(sock
, ua_chan
);
129 ret
= hashtable_destroy(ua_sess
->channels
);
131 ERR("UST app destroy session hashtable failed");
140 * Delete a traceable application structure from the global list. Never call
141 * this function outside of a call_rcu call.
143 static void delete_ust_app(struct ust_app
*app
)
146 struct cds_lfht_node
*node
;
147 struct cds_lfht_iter iter
;
148 struct ust_app_session
*ua_sess
;
153 /* Remove from key hash table */
154 node
= hashtable_lookup(ust_app_sock_key_map
,
155 (void *) ((unsigned long) app
->key
.sock
), sizeof(void *), &iter
);
157 /* Not suppose to happen */
158 ERR("UST app key %d not found in key hash table", app
->key
.sock
);
162 ret
= hashtable_del(ust_app_sock_key_map
, &iter
);
164 ERR("UST app unable to delete app sock %d from key hash table",
167 DBG2("UST app pair sock %d key %d deleted",
168 app
->key
.sock
, app
->key
.pid
);
171 /* Socket is already closed at this point */
173 /* Delete ust app sessions info */
174 sock
= app
->key
.sock
;
177 cds_lfht_for_each_entry(app
->sessions
, &iter
, ua_sess
, node
) {
178 hashtable_del(app
->sessions
, &iter
);
179 delete_ust_app_session(app
->key
.sock
, ua_sess
);
182 ret
= hashtable_destroy(app
->sessions
);
184 ERR("UST app destroy session hashtable failed");
189 * Wait until we have removed the key from the sock hash table
190 * before closing this socket, otherwise an application could
191 * re-use the socket ID and race with the teardown, using the
192 * same hash table entry.
196 DBG2("UST app pid %d deleted", app
->key
.pid
);
203 * URCU intermediate call to delete an UST app.
205 static void delete_ust_app_rcu(struct rcu_head
*head
)
207 struct cds_lfht_node
*node
=
208 caa_container_of(head
, struct cds_lfht_node
, head
);
209 struct ust_app
*app
=
210 caa_container_of(node
, struct ust_app
, node
);
216 * Find an ust_app using the sock and return it. RCU read side lock must be
217 * held before calling this helper function.
219 static struct ust_app
*find_app_by_sock(int sock
)
221 struct cds_lfht_node
*node
;
222 struct ust_app_key
*key
;
223 struct cds_lfht_iter iter
;
225 node
= hashtable_lookup(ust_app_sock_key_map
,
226 (void *)((unsigned long) sock
), sizeof(void *), &iter
);
228 DBG2("UST app find by sock %d key not found", sock
);
232 key
= caa_container_of(node
, struct ust_app_key
, node
);
234 node
= hashtable_lookup(ust_app_ht
,
235 (void *)((unsigned long) key
->pid
), sizeof(void *), &iter
);
237 DBG2("UST app find by sock %d not found", sock
);
240 return caa_container_of(node
, struct ust_app
, node
);
247 * Open metadata onto the UST tracer for a UST session.
249 static int open_ust_metadata(struct ust_app
*app
,
250 struct ust_app_session
*ua_sess
)
253 struct lttng_ust_channel_attr uattr
;
255 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
256 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
257 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
258 uattr
.switch_timer_interval
=
259 ua_sess
->metadata
->attr
.switch_timer_interval
;
260 uattr
.read_timer_interval
=
261 ua_sess
->metadata
->attr
.read_timer_interval
;
262 uattr
.output
= ua_sess
->metadata
->attr
.output
;
264 /* UST tracer metadata creation */
265 ret
= ustctl_open_metadata(app
->key
.sock
, ua_sess
->handle
, &uattr
,
266 &ua_sess
->metadata
->obj
);
268 ERR("UST app open metadata failed for app pid:%d",
278 * Create stream onto the UST tracer for a UST session.
280 static int create_ust_stream(struct ust_app
*app
,
281 struct ust_app_session
*ua_sess
)
285 ret
= ustctl_create_stream(app
->key
.sock
, ua_sess
->metadata
->obj
,
286 &ua_sess
->metadata
->stream_obj
);
288 ERR("UST create metadata stream failed");
297 * Create the specified channel onto the UST tracer for a UST session.
299 static int create_ust_channel(struct ust_app
*app
,
300 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
304 /* TODO: remove cast and use lttng-ust-abi.h */
305 ret
= ustctl_create_channel(app
->key
.sock
, ua_sess
->handle
,
306 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
308 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
309 "and session handle %d with ret %d",
310 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
,
311 ua_sess
->handle
, ret
);
315 ua_chan
->handle
= ua_chan
->obj
->handle
;
316 ua_chan
->attr
.shm_fd
= ua_chan
->obj
->shm_fd
;
317 ua_chan
->attr
.wait_fd
= ua_chan
->obj
->wait_fd
;
318 ua_chan
->attr
.memory_map_size
= ua_chan
->obj
->memory_map_size
;
320 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
321 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
);
328 * Create the specified event onto the UST tracer for a UST session.
330 static int create_ust_event(struct ust_app
*app
,
331 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
332 struct ust_app_event
*ua_event
)
336 /* Create UST event on tracer */
337 ret
= ustctl_create_event(app
->key
.sock
, &ua_event
->attr
, ua_chan
->obj
,
340 ERR("Error ustctl create event %s for app pid: %d with ret %d",
341 ua_event
->attr
.name
, app
->key
.pid
, ret
);
345 ua_event
->handle
= ua_event
->obj
->handle
;
346 ua_event
->enabled
= 1;
348 DBG2("UST app event %s created successfully for pid:%d",
349 ua_event
->attr
.name
, app
->key
.pid
);
356 * Alloc new UST app session.
358 static struct ust_app_session
*alloc_ust_app_session(void)
360 struct ust_app_session
*ua_sess
;
362 /* Init most of the default value by allocating and zeroing */
363 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
364 if (ua_sess
== NULL
) {
369 ua_sess
->handle
= -1;
370 ua_sess
->channels
= hashtable_new_str(0);
379 * Alloc new UST app channel.
381 static struct ust_app_channel
*alloc_ust_app_channel(char *name
,
382 struct lttng_ust_channel
*attr
)
384 struct ust_app_channel
*ua_chan
;
386 /* Init most of the default value by allocating and zeroing */
387 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
388 if (ua_chan
== NULL
) {
393 /* Setup channel name */
394 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
395 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
397 ua_chan
->handle
= -1;
398 ua_chan
->ctx
= hashtable_new(0);
399 ua_chan
->events
= hashtable_new_str(0);
400 hashtable_node_init(&ua_chan
->node
, (void *) ua_chan
->name
,
401 strlen(ua_chan
->name
));
403 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
405 /* Copy attributes */
407 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
410 DBG3("UST app channel %s allocated", ua_chan
->name
);
419 * Alloc new UST app event.
421 static struct ust_app_event
*alloc_ust_app_event(char *name
,
422 struct lttng_ust_event
*attr
)
424 struct ust_app_event
*ua_event
;
426 /* Init most of the default value by allocating and zeroing */
427 ua_event
= zmalloc(sizeof(struct ust_app_event
));
428 if (ua_event
== NULL
) {
433 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
434 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
435 ua_event
->ctx
= hashtable_new(0);
436 hashtable_node_init(&ua_event
->node
, (void *) ua_event
->name
,
437 strlen(ua_event
->name
));
439 /* Copy attributes */
441 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
444 DBG3("UST app event %s allocated", ua_event
->name
);
453 * Copy data between an UST app event and a LTT event.
455 static void shadow_copy_event(struct ust_app_event
*ua_event
,
456 struct ltt_ust_event
*uevent
)
458 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
459 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
461 /* Copy event attributes */
462 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
464 /* TODO: support copy context */
468 * Copy data between an UST app channel and a LTT channel.
470 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
471 struct ltt_ust_channel
*uchan
)
473 struct cds_lfht_iter iter
;
474 struct cds_lfht_node
*ua_event_node
;
475 struct ltt_ust_event
*uevent
;
476 struct ust_app_event
*ua_event
;
478 DBG2("Shadow copy of UST app channel %s", ua_chan
->name
);
480 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
481 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
482 /* Copy event attributes */
483 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
485 /* TODO: support copy context */
487 /* Copy all events from ltt ust channel to ust app channel */
488 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
489 struct cds_lfht_iter uiter
;
491 ua_event_node
= hashtable_lookup(ua_chan
->events
,
492 (void *) uevent
->attr
.name
, strlen(uevent
->attr
.name
),
494 if (ua_event_node
== NULL
) {
495 DBG2("UST event %s not found on shadow copy channel",
497 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
498 if (ua_event
== NULL
) {
501 shadow_copy_event(ua_event
, uevent
);
502 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
506 DBG3("Shadow copy channel done");
510 * Copy data between a UST app session and a regular LTT session.
512 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
513 struct ltt_ust_session
*usess
,
516 struct cds_lfht_node
*ua_chan_node
;
517 struct cds_lfht_iter iter
;
518 struct ltt_ust_channel
*uchan
;
519 struct ust_app_channel
*ua_chan
;
525 /* Get date and time for unique app path */
527 timeinfo
= localtime(&rawtime
);
528 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
530 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
532 ua_sess
->uid
= usess
->uid
;
534 ret
= snprintf(ua_sess
->path
, PATH_MAX
,
536 usess
->pathname
, app
->name
, app
->key
.pid
,
539 PERROR("asprintf UST shadow copy session");
540 /* TODO: We cannot return an error from here.. */
544 /* TODO: support all UST domain */
546 /* Iterate over all channels in global domain. */
547 cds_lfht_for_each_entry(usess
->domain_global
.channels
, &iter
,
549 struct cds_lfht_iter uiter
;
551 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
552 (void *)uchan
->name
, strlen(uchan
->name
),
554 if (ua_chan_node
!= NULL
) {
558 DBG2("Channel %s not found on shadow session copy, creating it",
560 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
561 if (ua_chan
== NULL
) {
562 /* malloc failed... continuing */
566 shadow_copy_channel(ua_chan
, uchan
);
567 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
572 void __lookup_session_by_app(struct ltt_ust_session
*usess
,
573 struct ust_app
*app
, struct cds_lfht_iter
*iter
)
575 /* Get right UST app session from app */
576 (void) hashtable_lookup(app
->sessions
,
577 (void *) ((unsigned long) usess
->uid
), sizeof(void *),
582 * Return ust app session from the app session hashtable using the UST session
585 static struct ust_app_session
*lookup_session_by_app(
586 struct ltt_ust_session
*usess
, struct ust_app
*app
)
588 struct cds_lfht_iter iter
;
589 struct cds_lfht_node
*node
;
591 __lookup_session_by_app(usess
, app
, &iter
);
592 node
= hashtable_iter_get_node(&iter
);
597 return caa_container_of(node
, struct ust_app_session
, node
);
604 * Create a UST session onto the tracer of app and add it the session
607 * Return ust app session or NULL on error.
609 static struct ust_app_session
*create_ust_app_session(
610 struct ltt_ust_session
*usess
, struct ust_app
*app
)
613 struct ust_app_session
*ua_sess
;
615 ua_sess
= lookup_session_by_app(usess
, app
);
616 if (ua_sess
== NULL
) {
617 DBG2("UST app pid: %d session uid %d not found, creating it",
618 app
->key
.pid
, usess
->uid
);
619 ua_sess
= alloc_ust_app_session();
620 if (ua_sess
== NULL
) {
621 /* Only malloc can failed so something is really wrong */
624 shadow_copy_session(ua_sess
, usess
, app
);
627 if (ua_sess
->handle
== -1) {
628 ret
= ustctl_create_session(app
->key
.sock
);
630 ERR("Error creating session for app pid %d, sock %d",
631 app
->key
.pid
, app
->key
.sock
);
632 /* TODO: free() ua_sess */
636 DBG2("UST app ustctl create session handle %d", ret
);
637 ua_sess
->handle
= ret
;
639 /* Add ust app session to app's HT */
640 hashtable_node_init(&ua_sess
->node
,
641 (void *)((unsigned long) ua_sess
->uid
), sizeof(void *));
642 hashtable_add_unique(app
->sessions
, &ua_sess
->node
);
644 DBG2("UST app session created successfully with handle %d", ret
);
654 * Create UST app channel and create it on the tracer.
656 static struct ust_app_channel
*create_ust_app_channel(
657 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
661 struct cds_lfht_iter iter
;
662 struct cds_lfht_node
*ua_chan_node
;
663 struct ust_app_channel
*ua_chan
;
665 /* Lookup channel in the ust app session */
666 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
667 (void *)uchan
->name
, strlen(uchan
->name
), &iter
);
668 if (ua_chan_node
== NULL
) {
669 DBG2("Unable to find channel %s in ust session uid %u",
670 uchan
->name
, ua_sess
->uid
);
671 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
672 if (ua_chan
== NULL
) {
675 shadow_copy_channel(ua_chan
, uchan
);
677 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
679 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
682 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
694 * Create UST app event and create it on the tracer side.
696 static struct ust_app_event
*create_ust_app_event(
697 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
698 struct ltt_ust_event
*uevent
, struct ust_app
*app
)
701 struct cds_lfht_iter iter
;
702 struct cds_lfht_node
*ua_event_node
;
703 struct ust_app_event
*ua_event
;
706 ua_event_node
= hashtable_lookup(ua_chan
->events
,
707 (void *)uevent
->attr
.name
, strlen(uevent
->attr
.name
), &iter
);
708 if (ua_event_node
== NULL
) {
709 DBG2("UST app event %s not found, creating it", uevent
->attr
.name
);
710 /* Does not exist so create one */
711 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
712 if (ua_event
== NULL
) {
713 /* Only malloc can failed so something is really wrong */
716 shadow_copy_event(ua_event
, uevent
);
718 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
720 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
723 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
735 * Create UST metadata and open it on the tracer side.
737 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
738 char *pathname
, struct ust_app
*app
)
742 if (ua_sess
->metadata
== NULL
) {
743 /* Allocate UST metadata */
744 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
745 if (ua_sess
->metadata
== NULL
) {
746 ERR("UST app session %d creating metadata failed",
751 ret
= open_ust_metadata(app
, ua_sess
);
756 DBG2("UST metadata opened for app pid %d", app
->key
.pid
);
759 /* Open UST metadata stream */
760 if (ua_sess
->metadata
->stream_obj
== NULL
) {
761 ret
= create_ust_stream(app
, ua_sess
);
766 ret
= mkdir(ua_sess
->path
, S_IRWXU
| S_IRWXG
);
768 PERROR("mkdir UST metadata");
772 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
773 "%s/metadata", ua_sess
->path
);
775 PERROR("asprintf UST create stream");
779 DBG2("UST metadata stream object created for app pid %d",
782 ERR("Attempting to create stream without metadata opened");
793 * Return pointer to traceable apps list.
795 struct cds_lfht
*ust_app_get_ht(void)
801 * Return ust app pointer or NULL if not found.
803 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
805 struct cds_lfht_node
*node
;
806 struct cds_lfht_iter iter
;
809 node
= hashtable_lookup(ust_app_ht
,
810 (void *)((unsigned long) pid
), sizeof(void *), &iter
);
812 DBG2("UST app no found with pid %d", pid
);
817 DBG2("Found UST app by pid %d", pid
);
819 return caa_container_of(node
, struct ust_app
, node
);
827 * Using pid and uid (of the app), allocate a new ust_app struct and
828 * add it to the global traceable app list.
830 * On success, return 0, else return malloc ENOMEM.
832 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
836 lta
= zmalloc(sizeof(struct ust_app
));
842 lta
->ppid
= msg
->ppid
;
845 lta
->v_major
= msg
->major
;
846 lta
->v_minor
= msg
->minor
;
847 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
848 lta
->name
[16] = '\0';
849 lta
->sessions
= hashtable_new(0);
852 lta
->key
.pid
= msg
->pid
;
853 hashtable_node_init(<a
->node
, (void *)((unsigned long)lta
->key
.pid
),
855 lta
->key
.sock
= sock
;
856 hashtable_node_init(<a
->key
.node
, (void *)((unsigned long)lta
->key
.sock
),
860 hashtable_add_unique(ust_app_sock_key_map
, <a
->key
.node
);
861 hashtable_add_unique(ust_app_ht
, <a
->node
);
864 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
865 " (version %d.%d)", lta
->key
.pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
866 lta
->key
.sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
872 * Unregister app by removing it from the global traceable app list and freeing
875 * The socket is already closed at this point so no close to sock.
877 void ust_app_unregister(int sock
)
880 struct cds_lfht_node
*node
;
881 struct cds_lfht_iter iter
;
884 lta
= find_app_by_sock(sock
);
886 ERR("Unregister app sock %d not found!", sock
);
890 DBG("PID %d unregistering with sock %d", lta
->key
.pid
, sock
);
892 /* Get the node reference for a call_rcu */
893 node
= hashtable_lookup(ust_app_ht
,
894 (void *)((unsigned long) lta
->key
.pid
), sizeof(void *), &iter
);
896 ERR("Unable to find app sock %d by pid %d", sock
, lta
->key
.pid
);
900 hashtable_del(ust_app_ht
, &iter
);
901 call_rcu(&node
->head
, delete_ust_app_rcu
);
908 * Return traceable_app_count
910 unsigned long ust_app_list_count(void)
915 count
= hashtable_get_count(ust_app_ht
);
922 * Fill events array with all events name of all registered apps.
924 int ust_app_list_events(struct lttng_event
**events
)
927 size_t nbmem
, count
= 0;
928 struct cds_lfht_iter iter
;
930 struct lttng_event
*tmp
;
932 nbmem
= UST_APP_EVENT_LIST_SIZE
;
933 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
935 PERROR("zmalloc ust app events");
942 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
943 handle
= ustctl_tracepoint_list(app
->key
.sock
);
945 ERR("UST app list events getting handle failed for app pid %d",
950 while ((ret
= ustctl_tracepoint_list_get(app
->key
.sock
, handle
,
951 tmp
[count
].name
)) != -ENOENT
) {
953 DBG2("Reallocating event list from %zu to %zu bytes", nbmem
,
954 nbmem
+ UST_APP_EVENT_LIST_SIZE
);
955 nbmem
+= UST_APP_EVENT_LIST_SIZE
;
956 tmp
= realloc(tmp
, nbmem
);
958 PERROR("realloc ust app events");
964 tmp
[count
].type
= LTTNG_UST_TRACEPOINT
;
965 tmp
[count
].pid
= app
->key
.pid
;
966 tmp
[count
].enabled
= -1;
974 DBG2("UST app list events done (%zu events)", count
);
983 * Free and clean all traceable apps of the global list.
985 void ust_app_clean_list(void)
988 struct cds_lfht_node
*node
;
989 struct cds_lfht_iter iter
;
992 DBG2("UST app cleaning registered apps hash table");
996 cds_lfht_for_each(ust_app_ht
, &iter
, node
) {
997 app
= caa_container_of(node
, struct ust_app
, node
);
999 ret
= hashtable_del(ust_app_ht
, &iter
);
1001 call_rcu(&node
->head
, delete_ust_app_rcu
);
1005 hashtable_destroy(ust_app_ht
);
1006 hashtable_destroy(ust_app_sock_key_map
);
1012 * Init UST app hash table.
1014 void ust_app_ht_alloc(void)
1016 ust_app_ht
= hashtable_new(0);
1017 ust_app_sock_key_map
= hashtable_new(0);
1021 * For a specific UST session, create the channel for all registered apps.
1023 int ust_app_create_channel_all(struct ltt_ust_session
*usess
,
1024 struct ltt_ust_channel
*uchan
)
1027 struct cds_lfht_iter iter
;
1028 struct ust_app
*app
;
1029 struct ust_app_session
*ua_sess
;
1030 struct ust_app_channel
*ua_chan
;
1032 if (usess
== NULL
|| uchan
== NULL
) {
1033 ERR("Adding UST global channel to NULL values");
1038 DBG2("UST app adding channel %s to global domain for session uid %d",
1039 uchan
->name
, usess
->uid
);
1043 /* For every registered applications */
1044 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1045 /* Create session on the tracer side and add it to app session HT */
1046 ua_sess
= create_ust_app_session(usess
, app
);
1047 if (ua_sess
== NULL
) {
1051 /* Create channel onto application */
1052 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
1053 if (ua_chan
== NULL
) {
1065 * For a specific UST session and UST channel, create the event for all
1068 int ust_app_create_event_all(struct ltt_ust_session
*usess
,
1069 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1072 struct cds_lfht_iter iter
;
1073 struct cds_lfht_node
*ua_chan_node
;
1074 struct ust_app
*app
;
1075 struct ust_app_session
*ua_sess
;
1076 struct ust_app_channel
*ua_chan
;
1077 struct ust_app_event
*ua_event
;
1079 DBG("UST app creating event %s for all apps for session uid %d",
1080 uevent
->attr
.name
, usess
->uid
);
1084 /* For all registered applications */
1085 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1086 struct cds_lfht_iter uiter
;
1088 /* Create session on the tracer side and add it to app session HT */
1089 ua_sess
= create_ust_app_session(usess
, app
);
1090 if (ua_sess
== NULL
) {
1094 /* Lookup channel in the ust app session */
1095 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
1096 (void *)uchan
->name
, strlen(uchan
->name
),
1098 if (ua_chan_node
== NULL
) {
1099 ERR("Channel %s not found in session uid %d. Skipping",
1100 uchan
->name
, usess
->uid
);
1103 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1105 ua_event
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
1106 if (ua_event
== NULL
) {
1117 * Start tracing for a specific UST session and app.
1119 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1122 struct cds_lfht_iter iter
;
1123 struct ust_app_session
*ua_sess
;
1124 struct ust_app_channel
*ua_chan
;
1125 struct ltt_ust_stream
*ustream
;
1127 DBG("Starting tracing for ust app pid %d", app
->key
.pid
);
1131 ua_sess
= lookup_session_by_app(usess
, app
);
1132 if (ua_sess
== NULL
) {
1133 /* Only malloc can failed so something is really wrong */
1134 goto error_rcu_unlock
;
1137 /* upon restart, we skip the setup, already done */
1138 if (ua_sess
->started
)
1141 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
1143 goto error_rcu_unlock
;
1146 /* For each channel */
1147 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1148 /* Create all streams */
1150 /* Create UST stream */
1151 ustream
= zmalloc(sizeof(*ustream
));
1152 if (ustream
== NULL
) {
1153 PERROR("zmalloc ust stream");
1154 goto error_rcu_unlock
;
1157 ret
= ustctl_create_stream(app
->key
.sock
, ua_chan
->obj
,
1160 /* Got all streams */
1163 ustream
->handle
= ustream
->obj
->handle
;
1165 /* Order is important */
1166 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
1167 ret
= snprintf(ustream
->pathname
, PATH_MAX
, "%s/%s_%u",
1168 ua_sess
->path
, ua_chan
->name
,
1169 ua_chan
->streams
.count
++);
1171 PERROR("asprintf UST create stream");
1174 DBG2("UST stream %d ready at %s", ua_chan
->streams
.count
,
1179 /* Setup UST consumer socket and send fds to it */
1180 ret
= ust_consumer_send_session(ust_consumer_fd
, ua_sess
);
1182 goto error_rcu_unlock
;
1184 ua_sess
->started
= 1;
1187 /* This start the UST tracing */
1188 ret
= ustctl_start_session(app
->key
.sock
, ua_sess
->handle
);
1190 ERR("Error starting tracing for app pid: %d", app
->key
.pid
);
1191 goto error_rcu_unlock
;
1196 /* Quiescent wait after starting trace */
1197 ustctl_wait_quiescent(app
->key
.sock
);
1207 * Stop tracing for a specific UST session and app.
1209 int ust_app_stop_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1212 struct ust_app_session
*ua_sess
;
1214 DBG("Stopping tracing for ust app pid %d", app
->key
.pid
);
1218 ua_sess
= lookup_session_by_app(usess
, app
);
1219 if (ua_sess
== NULL
) {
1220 /* Only malloc can failed so something is really wrong */
1221 goto error_rcu_unlock
;
1224 #if 0 /* only useful when periodical flush will be supported */
1225 /* need to keep a handle on shm in session for this. */
1226 /* Flush all buffers before stopping */
1227 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
1229 ERR("UST metadata flush failed");
1232 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
1233 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
1235 ERR("UST flush buffer error");
1240 /* This inhibits UST tracing */
1241 ret
= ustctl_stop_session(app
->key
.sock
, ua_sess
->handle
);
1243 ERR("Error stopping tracing for app pid: %d", app
->key
.pid
);
1244 goto error_rcu_unlock
;
1249 /* Quiescent wait after stopping trace */
1250 ustctl_wait_quiescent(app
->key
.sock
);
1260 * Destroy a specific UST session in apps.
1262 int ust_app_destroy_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1264 struct ust_app_session
*ua_sess
;
1265 struct lttng_ust_object_data obj
;
1266 struct cds_lfht_iter iter
;
1267 struct cds_lfht_node
*node
;
1269 DBG("Destroy tracing for ust app pid %d", app
->key
.pid
);
1273 __lookup_session_by_app(usess
, app
, &iter
);
1274 node
= hashtable_iter_get_node(&iter
);
1276 /* Only malloc can failed so something is really wrong */
1277 goto error_rcu_unlock
;
1279 ua_sess
= caa_container_of(node
, struct ust_app_session
, node
);
1280 hashtable_del(app
->sessions
, &iter
);
1281 delete_ust_app_session(app
->key
.sock
, ua_sess
);
1282 obj
.handle
= ua_sess
->handle
;
1285 obj
.memory_map_size
= 0;
1286 ustctl_release_object(app
->key
.sock
, &obj
);
1290 /* Quiescent wait after stopping trace */
1291 ustctl_wait_quiescent(app
->key
.sock
);
1301 * Start tracing for the UST session.
1303 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
1306 struct cds_lfht_iter iter
;
1307 struct ust_app
*app
;
1309 DBG("Starting all UST traces");
1313 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1314 ret
= ust_app_start_trace(usess
, app
);
1316 /* Continue to next apps even on error */
1327 * Start tracing for the UST session.
1329 int ust_app_stop_trace_all(struct ltt_ust_session
*usess
)
1332 struct cds_lfht_iter iter
;
1333 struct ust_app
*app
;
1335 DBG("Stopping all UST traces");
1339 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1340 ret
= ust_app_stop_trace(usess
, app
);
1342 /* Continue to next apps even on error */
1353 * Destroy app UST session.
1355 int ust_app_destroy_trace_all(struct ltt_ust_session
*usess
)
1358 struct cds_lfht_iter iter
;
1359 struct ust_app
*app
;
1361 DBG("Destroy all UST traces");
1365 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1366 ret
= ust_app_destroy_trace(usess
, app
);
1368 /* Continue to next apps even on error */
1379 * Add channels/events from UST global domain to registered apps at sock.
1381 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
1384 struct cds_lfht_iter iter
;
1385 struct ust_app
*app
;
1386 struct ust_app_session
*ua_sess
;
1387 struct ust_app_channel
*ua_chan
;
1388 struct ust_app_event
*ua_event
;
1390 if (usess
== NULL
) {
1391 ERR("No UST session on global update. Returning");
1395 DBG2("UST app global update for app sock %d for session uid %d", sock
,
1400 app
= find_app_by_sock(sock
);
1402 ERR("Failed to update app sock %d", sock
);
1406 ua_sess
= create_ust_app_session(usess
, app
);
1407 if (ua_sess
== NULL
) {
1412 * We can iterate safely here over all UST app session sicne the create ust
1413 * app session above made a shadow copy of the UST global domain from the
1416 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1417 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1419 /* FIXME: Should we quit here or continue... */
1423 /* For each events */
1424 cds_lfht_for_each_entry(ua_chan
->events
, &iter
, ua_event
, node
) {
1425 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1427 /* FIXME: Should we quit here or continue... */
1433 if (usess
->start_trace
) {
1434 ret
= ust_app_start_trace(usess
, app
);
1439 DBG2("UST trace started for app pid %d", app
->key
.pid
);