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
);
54 * Delete ust app stream safely. RCU read lock must be held before calling
57 static void delete_ust_app_stream(int sock
, struct ltt_ust_stream
*stream
)
60 //stream is used for passing to consumer.
61 //send_channel_streams is responsible for freeing the streams.
62 //note that this will not play well with flight recorder mode:
63 //we might need a criterion to discard the streams.
67 * Delete ust app channel safely. RCU read lock must be held before calling
70 static void delete_ust_app_channel(int sock
, struct ust_app_channel
*ua_chan
)
73 struct cds_lfht_iter iter
;
74 struct ust_app_event
*ua_event
;
75 struct ltt_ust_stream
*stream
, *stmp
;
77 cds_list_for_each_entry_safe(stream
, stmp
, &ua_chan
->streams
.head
, 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");
104 * Delete ust app session safely. RCU read lock must be held before calling
107 static void delete_ust_app_session(int sock
,
108 struct ust_app_session
*ua_sess
)
111 struct cds_lfht_iter iter
;
112 struct ust_app_channel
*ua_chan
;
114 if (ua_sess
->metadata
) {
116 * We do NOT release the stream object and metadata object since they
117 * are release when fds are sent to the consumer.
121 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
122 hashtable_del(ua_sess
->channels
, &iter
);
123 delete_ust_app_channel(sock
, ua_chan
);
126 ret
= hashtable_destroy(ua_sess
->channels
);
128 ERR("UST app destroy session hashtable failed");
137 * Delete a traceable application structure from the global list. Never call
138 * this function outside of a call_rcu call.
140 static void delete_ust_app(struct ust_app
*app
)
143 struct cds_lfht_node
*node
;
144 struct cds_lfht_iter iter
;
145 struct ust_app_session
*ua_sess
;
149 /* Remove from key hash table */
150 node
= hashtable_lookup(ust_app_sock_key_map
,
151 (void *) ((unsigned long) app
->key
.sock
), sizeof(void *), &iter
);
153 /* Not suppose to happen */
154 ERR("UST app key %d not found in key hash table", app
->key
.sock
);
158 ret
= hashtable_del(ust_app_sock_key_map
, &iter
);
160 ERR("UST app unable to delete app sock %d from key hash table",
163 DBG2("UST app pair sock %d key %d deleted",
164 app
->key
.sock
, app
->key
.pid
);
167 /* Socket is already closed at this point */
169 /* Delete ust app sessions info */
170 if (app
->sock_closed
) {
174 cds_lfht_for_each_entry(app
->sessions
, &iter
, ua_sess
, node
) {
175 hashtable_del(app
->sessions
, &iter
);
176 delete_ust_app_session(app
->key
.sock
, ua_sess
);
179 ret
= hashtable_destroy(app
->sessions
);
181 ERR("UST app destroy session hashtable failed");
185 if (!app
->sock_closed
) {
186 close(app
->key
.sock
);
189 DBG2("UST app pid %d deleted", app
->key
.pid
);
196 * URCU intermediate call to delete an UST app.
198 static void delete_ust_app_rcu(struct rcu_head
*head
)
200 struct cds_lfht_node
*node
=
201 caa_container_of(head
, struct cds_lfht_node
, head
);
202 struct ust_app
*app
=
203 caa_container_of(node
, struct ust_app
, node
);
209 * Find an ust_app using the sock and return it. RCU read side lock must be
210 * held before calling this helper function.
212 static struct ust_app
*find_app_by_sock(int sock
)
214 struct cds_lfht_node
*node
;
215 struct ust_app_key
*key
;
216 struct cds_lfht_iter iter
;
218 node
= hashtable_lookup(ust_app_sock_key_map
,
219 (void *)((unsigned long) sock
), sizeof(void *), &iter
);
221 DBG2("UST app find by sock %d key not found", sock
);
225 key
= caa_container_of(node
, struct ust_app_key
, node
);
227 node
= hashtable_lookup(ust_app_ht
,
228 (void *)((unsigned long) key
->pid
), sizeof(void *), &iter
);
230 DBG2("UST app find by sock %d not found", sock
);
233 return caa_container_of(node
, struct ust_app
, node
);
240 * Open metadata onto the UST tracer for a UST session.
242 static int open_ust_metadata(struct ust_app
*app
,
243 struct ust_app_session
*ua_sess
)
246 struct lttng_ust_channel_attr uattr
;
248 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
249 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
250 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
251 uattr
.switch_timer_interval
=
252 ua_sess
->metadata
->attr
.switch_timer_interval
;
253 uattr
.read_timer_interval
=
254 ua_sess
->metadata
->attr
.read_timer_interval
;
255 uattr
.output
= ua_sess
->metadata
->attr
.output
;
257 /* UST tracer metadata creation */
258 ret
= ustctl_open_metadata(app
->key
.sock
, ua_sess
->handle
, &uattr
,
259 &ua_sess
->metadata
->obj
);
261 ERR("UST app open metadata failed for app pid:%d",
271 * Create stream onto the UST tracer for a UST session.
273 static int create_ust_stream(struct ust_app
*app
,
274 struct ust_app_session
*ua_sess
)
278 ret
= ustctl_create_stream(app
->key
.sock
, ua_sess
->metadata
->obj
,
279 &ua_sess
->metadata
->stream_obj
);
281 ERR("UST create metadata stream failed");
290 * Create the specified channel onto the UST tracer for a UST session.
292 static int create_ust_channel(struct ust_app
*app
,
293 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
297 /* TODO: remove cast and use lttng-ust-abi.h */
298 ret
= ustctl_create_channel(app
->key
.sock
, ua_sess
->handle
,
299 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
301 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
302 "and session handle %d with ret %d",
303 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
,
304 ua_sess
->handle
, ret
);
308 ua_chan
->handle
= ua_chan
->obj
->handle
;
309 ua_chan
->attr
.shm_fd
= ua_chan
->obj
->shm_fd
;
310 ua_chan
->attr
.wait_fd
= ua_chan
->obj
->wait_fd
;
311 ua_chan
->attr
.memory_map_size
= ua_chan
->obj
->memory_map_size
;
313 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
314 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
);
321 * Create the specified event onto the UST tracer for a UST session.
323 static int create_ust_event(struct ust_app
*app
,
324 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
325 struct ust_app_event
*ua_event
)
329 /* Create UST event on tracer */
330 ret
= ustctl_create_event(app
->key
.sock
, &ua_event
->attr
, ua_chan
->obj
,
333 ERR("Error ustctl create event %s for app pid: %d with ret %d",
334 ua_event
->attr
.name
, app
->key
.pid
, ret
);
338 ua_event
->handle
= ua_event
->obj
->handle
;
339 ua_event
->enabled
= 1;
341 DBG2("UST app event %s created successfully for pid:%d",
342 ua_event
->attr
.name
, app
->key
.pid
);
349 * Alloc new UST app session.
351 static struct ust_app_session
*alloc_ust_app_session(void)
353 struct ust_app_session
*ua_sess
;
355 /* Init most of the default value by allocating and zeroing */
356 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
357 if (ua_sess
== NULL
) {
362 ua_sess
->handle
= -1;
363 ua_sess
->channels
= hashtable_new_str(0);
372 * Alloc new UST app channel.
374 static struct ust_app_channel
*alloc_ust_app_channel(char *name
,
375 struct lttng_ust_channel
*attr
)
377 struct ust_app_channel
*ua_chan
;
379 /* Init most of the default value by allocating and zeroing */
380 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
381 if (ua_chan
== NULL
) {
386 /* Setup channel name */
387 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
388 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
390 ua_chan
->handle
= -1;
391 ua_chan
->ctx
= hashtable_new(0);
392 ua_chan
->events
= hashtable_new_str(0);
393 hashtable_node_init(&ua_chan
->node
, (void *) ua_chan
->name
,
394 strlen(ua_chan
->name
));
396 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
398 /* Copy attributes */
400 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
403 DBG3("UST app channel %s allocated", ua_chan
->name
);
412 * Alloc new UST app event.
414 static struct ust_app_event
*alloc_ust_app_event(char *name
,
415 struct lttng_ust_event
*attr
)
417 struct ust_app_event
*ua_event
;
419 /* Init most of the default value by allocating and zeroing */
420 ua_event
= zmalloc(sizeof(struct ust_app_event
));
421 if (ua_event
== NULL
) {
426 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
427 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
428 ua_event
->ctx
= hashtable_new(0);
429 hashtable_node_init(&ua_event
->node
, (void *) ua_event
->name
,
430 strlen(ua_event
->name
));
432 /* Copy attributes */
434 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
437 DBG3("UST app event %s allocated", ua_event
->name
);
446 * Copy data between an UST app event and a LTT event.
448 static void shadow_copy_event(struct ust_app_event
*ua_event
,
449 struct ltt_ust_event
*uevent
)
451 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
452 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
454 /* Copy event attributes */
455 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
457 /* TODO: support copy context */
461 * Copy data between an UST app channel and a LTT channel.
463 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
464 struct ltt_ust_channel
*uchan
)
466 struct cds_lfht_iter iter
;
467 struct cds_lfht_node
*ua_event_node
;
468 struct ltt_ust_event
*uevent
;
469 struct ust_app_event
*ua_event
;
471 DBG2("Shadow copy of UST app channel %s", ua_chan
->name
);
473 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
474 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
475 /* Copy event attributes */
476 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
478 /* TODO: support copy context */
480 /* Copy all events from ltt ust channel to ust app channel */
481 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
482 struct cds_lfht_iter uiter
;
484 ua_event_node
= hashtable_lookup(ua_chan
->events
,
485 (void *) uevent
->attr
.name
, strlen(uevent
->attr
.name
),
487 if (ua_event_node
== NULL
) {
488 DBG2("UST event %s not found on shadow copy channel",
490 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
491 if (ua_event
== NULL
) {
494 shadow_copy_event(ua_event
, uevent
);
495 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
499 DBG3("Shadow copy channel done");
503 * Copy data between a UST app session and a regular LTT session.
505 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
506 struct ltt_ust_session
*usess
,
509 struct cds_lfht_node
*ua_chan_node
;
510 struct cds_lfht_iter iter
;
511 struct ltt_ust_channel
*uchan
;
512 struct ust_app_channel
*ua_chan
;
518 /* Get date and time for unique app path */
520 timeinfo
= localtime(&rawtime
);
521 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
523 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
525 ua_sess
->uid
= usess
->uid
;
527 ret
= snprintf(ua_sess
->path
, PATH_MAX
,
529 usess
->pathname
, app
->name
, app
->key
.pid
,
532 PERROR("asprintf UST shadow copy session");
533 /* TODO: We cannot return an error from here.. */
537 /* TODO: support all UST domain */
539 /* Iterate over all channels in global domain. */
540 cds_lfht_for_each_entry(usess
->domain_global
.channels
, &iter
,
542 struct cds_lfht_iter uiter
;
544 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
545 (void *)uchan
->name
, strlen(uchan
->name
),
547 if (ua_chan_node
!= NULL
) {
551 DBG2("Channel %s not found on shadow session copy, creating it",
553 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
554 if (ua_chan
== NULL
) {
555 /* malloc failed... continuing */
559 shadow_copy_channel(ua_chan
, uchan
);
560 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
565 * Return ust app session from the app session hashtable using the UST session
568 static struct ust_app_session
*lookup_session_by_app(
569 struct ltt_ust_session
*usess
, struct ust_app
*app
)
571 struct cds_lfht_iter iter
;
572 struct cds_lfht_node
*node
;
574 /* Get right UST app session from app */
575 node
= hashtable_lookup(app
->sessions
,
576 (void *) ((unsigned long) usess
->uid
), sizeof(void *), &iter
);
581 return caa_container_of(node
, struct ust_app_session
, node
);
588 * Create a UST session onto the tracer of app and add it the session
591 * Return ust app session or NULL on error.
593 static struct ust_app_session
*create_ust_app_session(
594 struct ltt_ust_session
*usess
, struct ust_app
*app
)
597 struct ust_app_session
*ua_sess
;
599 ua_sess
= lookup_session_by_app(usess
, app
);
600 if (ua_sess
== NULL
) {
601 DBG2("UST app pid: %d session uid %d not found, creating it",
602 app
->key
.pid
, usess
->uid
);
603 ua_sess
= alloc_ust_app_session();
604 if (ua_sess
== NULL
) {
605 /* Only malloc can failed so something is really wrong */
608 shadow_copy_session(ua_sess
, usess
, app
);
611 if (ua_sess
->handle
== -1) {
612 ret
= ustctl_create_session(app
->key
.sock
);
614 ERR("Error creating session for app pid %d, sock %d",
615 app
->key
.pid
, app
->key
.sock
);
616 /* TODO: free() ua_sess */
620 DBG2("UST app ustctl create session handle %d", ret
);
621 ua_sess
->handle
= ret
;
623 /* Add ust app session to app's HT */
624 hashtable_node_init(&ua_sess
->node
,
625 (void *)((unsigned long) ua_sess
->uid
), sizeof(void *));
626 hashtable_add_unique(app
->sessions
, &ua_sess
->node
);
628 DBG2("UST app session created successfully with handle %d", ret
);
638 * Create UST app channel and create it on the tracer.
640 static struct ust_app_channel
*create_ust_app_channel(
641 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
645 struct cds_lfht_iter iter
;
646 struct cds_lfht_node
*ua_chan_node
;
647 struct ust_app_channel
*ua_chan
;
649 /* Lookup channel in the ust app session */
650 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
651 (void *)uchan
->name
, strlen(uchan
->name
), &iter
);
652 if (ua_chan_node
== NULL
) {
653 DBG2("Unable to find channel %s in ust session uid %u",
654 uchan
->name
, ua_sess
->uid
);
655 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
656 if (ua_chan
== NULL
) {
659 shadow_copy_channel(ua_chan
, uchan
);
661 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
663 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
666 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
678 * Create UST app event and create it on the tracer side.
680 static struct ust_app_event
*create_ust_app_event(
681 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
682 struct ltt_ust_event
*uevent
, struct ust_app
*app
)
685 struct cds_lfht_iter iter
;
686 struct cds_lfht_node
*ua_event_node
;
687 struct ust_app_event
*ua_event
;
690 ua_event_node
= hashtable_lookup(ua_chan
->events
,
691 (void *)uevent
->attr
.name
, strlen(uevent
->attr
.name
), &iter
);
692 if (ua_event_node
== NULL
) {
693 DBG2("UST app event %s not found, creating it", uevent
->attr
.name
);
694 /* Does not exist so create one */
695 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
696 if (ua_event
== NULL
) {
697 /* Only malloc can failed so something is really wrong */
700 shadow_copy_event(ua_event
, uevent
);
702 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
704 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
707 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
719 * Create UST metadata and open it on the tracer side.
721 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
722 char *pathname
, struct ust_app
*app
)
726 if (ua_sess
->metadata
== NULL
) {
727 /* Allocate UST metadata */
728 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
729 if (ua_sess
->metadata
== NULL
) {
730 ERR("UST app session %d creating metadata failed",
735 ret
= open_ust_metadata(app
, ua_sess
);
740 DBG2("UST metadata opened for app pid %d", app
->key
.pid
);
743 /* Open UST metadata stream */
744 if (ua_sess
->metadata
->stream_obj
== NULL
) {
745 ret
= create_ust_stream(app
, ua_sess
);
750 ret
= mkdir(ua_sess
->path
, S_IRWXU
| S_IRWXG
);
752 PERROR("mkdir UST metadata");
756 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
757 "%s/metadata", ua_sess
->path
);
759 PERROR("asprintf UST create stream");
763 DBG2("UST metadata stream object created for app pid %d",
766 ERR("Attempting to create stream without metadata opened");
777 * Return pointer to traceable apps list.
779 struct cds_lfht
*ust_app_get_ht(void)
785 * Return ust app pointer or NULL if not found.
787 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
789 struct cds_lfht_node
*node
;
790 struct cds_lfht_iter iter
;
793 node
= hashtable_lookup(ust_app_ht
,
794 (void *)((unsigned long) pid
), sizeof(void *), &iter
);
796 DBG2("UST app no found with pid %d", pid
);
801 DBG2("Found UST app by pid %d", pid
);
803 return caa_container_of(node
, struct ust_app
, node
);
811 * Using pid and uid (of the app), allocate a new ust_app struct and
812 * add it to the global traceable app list.
814 * On success, return 0, else return malloc ENOMEM.
816 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
820 lta
= zmalloc(sizeof(struct ust_app
));
826 lta
->ppid
= msg
->ppid
;
829 lta
->v_major
= msg
->major
;
830 lta
->v_minor
= msg
->minor
;
831 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
832 lta
->name
[16] = '\0';
833 lta
->sessions
= hashtable_new(0);
836 lta
->key
.pid
= msg
->pid
;
837 hashtable_node_init(<a
->node
, (void *)((unsigned long)lta
->key
.pid
),
839 lta
->key
.sock
= sock
;
840 hashtable_node_init(<a
->key
.node
, (void *)((unsigned long)lta
->key
.sock
),
844 hashtable_add_unique(ust_app_sock_key_map
, <a
->key
.node
);
845 hashtable_add_unique(ust_app_ht
, <a
->node
);
848 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
849 " (version %d.%d)", lta
->key
.pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
850 lta
->key
.sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
856 * Unregister app by removing it from the global traceable app list and freeing
859 * The socket is already closed at this point so no close to sock.
861 void ust_app_unregister(int sock
)
864 struct cds_lfht_node
*node
;
865 struct cds_lfht_iter iter
;
868 lta
= find_app_by_sock(sock
);
870 ERR("Unregister app sock %d not found!", sock
);
874 DBG("PID %d unregistering with sock %d", lta
->key
.pid
, sock
);
876 /* Get the node reference for a call_rcu */
877 node
= hashtable_lookup(ust_app_ht
,
878 (void *)((unsigned long) lta
->key
.pid
), sizeof(void *), &iter
);
880 ERR("Unable to find app sock %d by pid %d", sock
, lta
->key
.pid
);
884 /* We got called because the socket was closed on the remote end. */
886 /* Using a flag because we still need "sock" as a key. */
887 lta
->sock_closed
= 1;
888 hashtable_del(ust_app_ht
, &iter
);
889 call_rcu(&node
->head
, delete_ust_app_rcu
);
896 * Return traceable_app_count
898 unsigned long ust_app_list_count(void)
903 count
= hashtable_get_count(ust_app_ht
);
910 * Fill events array with all events name of all registered apps.
912 int ust_app_list_events(struct lttng_event
**events
)
915 size_t nbmem
, count
= 0;
916 struct cds_lfht_iter iter
;
918 struct lttng_event
*tmp
;
920 nbmem
= UST_APP_EVENT_LIST_SIZE
;
921 tmp
= zmalloc(nbmem
* sizeof(struct lttng_event
));
923 PERROR("zmalloc ust app events");
930 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
931 handle
= ustctl_tracepoint_list(app
->key
.sock
);
933 ERR("UST app list events getting handle failed for app pid %d",
938 while ((ret
= ustctl_tracepoint_list_get(app
->key
.sock
, handle
,
939 tmp
[count
].name
)) != -ENOENT
) {
941 DBG2("Reallocating event list from %zu to %zu bytes", nbmem
,
942 nbmem
+ UST_APP_EVENT_LIST_SIZE
);
943 nbmem
+= UST_APP_EVENT_LIST_SIZE
;
944 tmp
= realloc(tmp
, nbmem
);
946 PERROR("realloc ust app events");
952 tmp
[count
].type
= LTTNG_UST_TRACEPOINT
;
953 tmp
[count
].pid
= app
->key
.pid
;
954 tmp
[count
].enabled
= -1;
962 DBG2("UST app list events done (%zu events)", count
);
971 * Free and clean all traceable apps of the global list.
973 void ust_app_clean_list(void)
976 struct cds_lfht_node
*node
;
977 struct cds_lfht_iter iter
;
980 DBG2("UST app cleaning registered apps hash table");
984 cds_lfht_for_each(ust_app_ht
, &iter
, node
) {
985 app
= caa_container_of(node
, struct ust_app
, node
);
986 close(app
->key
.sock
);
987 app
->sock_closed
= 1;
989 ret
= hashtable_del(ust_app_ht
, &iter
);
991 call_rcu(&node
->head
, delete_ust_app_rcu
);
995 hashtable_destroy(ust_app_ht
);
996 hashtable_destroy(ust_app_sock_key_map
);
1002 * Init UST app hash table.
1004 void ust_app_ht_alloc(void)
1006 ust_app_ht
= hashtable_new(0);
1007 ust_app_sock_key_map
= hashtable_new(0);
1011 * For a specific UST session, create the channel for all registered apps.
1013 int ust_app_create_channel_all(struct ltt_ust_session
*usess
,
1014 struct ltt_ust_channel
*uchan
)
1017 struct cds_lfht_iter iter
;
1018 struct ust_app
*app
;
1019 struct ust_app_session
*ua_sess
;
1020 struct ust_app_channel
*ua_chan
;
1022 if (usess
== NULL
|| uchan
== NULL
) {
1023 ERR("Adding UST global channel to NULL values");
1028 DBG2("UST app adding channel %s to global domain for session uid %d",
1029 uchan
->name
, usess
->uid
);
1033 /* For every registered applications */
1034 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1035 /* Create session on the tracer side and add it to app session HT */
1036 ua_sess
= create_ust_app_session(usess
, app
);
1037 if (ua_sess
== NULL
) {
1041 /* Create channel onto application */
1042 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
1043 if (ua_chan
== NULL
) {
1055 * For a specific UST session and UST channel, create the event for all
1058 int ust_app_create_event_all(struct ltt_ust_session
*usess
,
1059 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1062 struct cds_lfht_iter iter
;
1063 struct cds_lfht_node
*ua_chan_node
;
1064 struct ust_app
*app
;
1065 struct ust_app_session
*ua_sess
;
1066 struct ust_app_channel
*ua_chan
;
1067 struct ust_app_event
*ua_event
;
1069 DBG("UST app creating event %s for all apps for session uid %d",
1070 uevent
->attr
.name
, usess
->uid
);
1074 /* For all registered applications */
1075 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1076 struct cds_lfht_iter uiter
;
1078 /* Create session on the tracer side and add it to app session HT */
1079 ua_sess
= create_ust_app_session(usess
, app
);
1080 if (ua_sess
== NULL
) {
1084 /* Lookup channel in the ust app session */
1085 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
1086 (void *)uchan
->name
, strlen(uchan
->name
),
1088 if (ua_chan_node
== NULL
) {
1089 ERR("Channel %s not found in session uid %d. Skipping",
1090 uchan
->name
, usess
->uid
);
1093 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1095 ua_event
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
1096 if (ua_event
== NULL
) {
1107 * Start tracing for a specific UST session and app.
1109 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1112 struct cds_lfht_iter iter
;
1113 struct ust_app_session
*ua_sess
;
1114 struct ust_app_channel
*ua_chan
;
1115 struct ltt_ust_stream
*ustream
;
1117 DBG("Starting tracing for ust app pid %d", app
->key
.pid
);
1121 ua_sess
= lookup_session_by_app(usess
, app
);
1122 if (ua_sess
== NULL
) {
1123 /* Only malloc can failed so something is really wrong */
1124 goto error_rcu_unlock
;
1127 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
1129 goto error_rcu_unlock
;
1132 /* For each channel */
1133 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1134 /* Create all streams */
1136 /* Create UST stream */
1137 ustream
= zmalloc(sizeof(*ustream
));
1138 if (ustream
== NULL
) {
1139 PERROR("zmalloc ust stream");
1140 goto error_rcu_unlock
;
1143 ret
= ustctl_create_stream(app
->key
.sock
, ua_chan
->obj
,
1146 /* Got all streams */
1149 ustream
->handle
= ustream
->obj
->handle
;
1151 /* Order is important */
1152 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
1153 ret
= snprintf(ustream
->pathname
, PATH_MAX
, "%s/%s_%u",
1154 ua_sess
->path
, ua_chan
->name
,
1155 ua_chan
->streams
.count
++);
1157 PERROR("asprintf UST create stream");
1160 DBG2("UST stream %d ready at %s", ua_chan
->streams
.count
,
1165 /* Setup UST consumer socket and send fds to it */
1166 ret
= ust_consumer_send_session(ust_consumer_fd
, ua_sess
);
1168 goto error_rcu_unlock
;
1171 /* This start the UST tracing */
1172 ret
= ustctl_start_session(app
->key
.sock
, ua_sess
->handle
);
1174 ERR("Error starting tracing for app pid: %d", app
->key
.pid
);
1175 goto error_rcu_unlock
;
1180 /* Quiescent wait after starting trace */
1181 ustctl_wait_quiescent(app
->key
.sock
);
1191 * Start tracing for the UST session.
1193 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
1196 struct cds_lfht_iter iter
;
1197 struct ust_app
*app
;
1199 DBG("Starting all UST traces");
1203 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1204 ret
= ust_app_start_trace(usess
, app
);
1206 /* Continue to next apps even on error */
1217 * Add channels/events from UST global domain to registered apps at sock.
1219 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
1222 struct cds_lfht_iter iter
;
1223 struct ust_app
*app
;
1224 struct ust_app_session
*ua_sess
;
1225 struct ust_app_channel
*ua_chan
;
1226 struct ust_app_event
*ua_event
;
1228 if (usess
== NULL
) {
1229 ERR("No UST session on global update. Returning");
1233 DBG2("UST app global update for app sock %d for session uid %d", sock
,
1238 app
= find_app_by_sock(sock
);
1240 ERR("Failed to update app sock %d", sock
);
1244 ua_sess
= create_ust_app_session(usess
, app
);
1245 if (ua_sess
== NULL
) {
1250 * We can iterate safely here over all UST app session sicne the create ust
1251 * app session above made a shadow copy of the UST global domain from the
1254 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1255 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1257 /* FIXME: Should we quit here or continue... */
1261 /* For each events */
1262 cds_lfht_for_each_entry(ua_chan
->events
, &iter
, ua_event
, node
) {
1263 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1265 /* FIXME: Should we quit here or continue... */
1271 if (usess
->start_trace
) {
1272 ret
= ust_app_start_trace(usess
, app
);
1277 DBG2("UST trace started for app pid %d", app
->key
.pid
);