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
;
150 /* Remove from key hash table */
151 node
= hashtable_lookup(ust_app_sock_key_map
,
152 (void *) ((unsigned long) app
->key
.sock
), sizeof(void *), &iter
);
154 /* Not suppose to happen */
155 ERR("UST app key %d not found in key hash table", app
->key
.sock
);
159 ret
= hashtable_del(ust_app_sock_key_map
, &iter
);
161 ERR("UST app unable to delete app sock %d from key hash table",
164 DBG2("UST app pair sock %d key %d deleted",
165 app
->key
.sock
, app
->key
.pid
);
168 /* Socket is already closed at this point */
170 /* Delete ust app sessions info */
171 sock
= app
->key
.sock
;
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");
186 * Wait until we have removed the key from the sock hash table
187 * before closing this socket, otherwise an application could
188 * re-use the socket ID and race with the teardown, using the
189 * same hash table entry.
193 DBG2("UST app pid %d deleted", app
->key
.pid
);
200 * URCU intermediate call to delete an UST app.
202 static void delete_ust_app_rcu(struct rcu_head
*head
)
204 struct cds_lfht_node
*node
=
205 caa_container_of(head
, struct cds_lfht_node
, head
);
206 struct ust_app
*app
=
207 caa_container_of(node
, struct ust_app
, node
);
213 * Find an ust_app using the sock and return it. RCU read side lock must be
214 * held before calling this helper function.
216 static struct ust_app
*find_app_by_sock(int sock
)
218 struct cds_lfht_node
*node
;
219 struct ust_app_key
*key
;
220 struct cds_lfht_iter iter
;
222 node
= hashtable_lookup(ust_app_sock_key_map
,
223 (void *)((unsigned long) sock
), sizeof(void *), &iter
);
225 DBG2("UST app find by sock %d key not found", sock
);
229 key
= caa_container_of(node
, struct ust_app_key
, node
);
231 node
= hashtable_lookup(ust_app_ht
,
232 (void *)((unsigned long) key
->pid
), sizeof(void *), &iter
);
234 DBG2("UST app find by sock %d not found", sock
);
237 return caa_container_of(node
, struct ust_app
, node
);
244 * Open metadata onto the UST tracer for a UST session.
246 static int open_ust_metadata(struct ust_app
*app
,
247 struct ust_app_session
*ua_sess
)
250 struct lttng_ust_channel_attr uattr
;
252 uattr
.overwrite
= ua_sess
->metadata
->attr
.overwrite
;
253 uattr
.subbuf_size
= ua_sess
->metadata
->attr
.subbuf_size
;
254 uattr
.num_subbuf
= ua_sess
->metadata
->attr
.num_subbuf
;
255 uattr
.switch_timer_interval
=
256 ua_sess
->metadata
->attr
.switch_timer_interval
;
257 uattr
.read_timer_interval
=
258 ua_sess
->metadata
->attr
.read_timer_interval
;
259 uattr
.output
= ua_sess
->metadata
->attr
.output
;
261 /* UST tracer metadata creation */
262 ret
= ustctl_open_metadata(app
->key
.sock
, ua_sess
->handle
, &uattr
,
263 &ua_sess
->metadata
->obj
);
265 ERR("UST app open metadata failed for app pid:%d",
275 * Create stream onto the UST tracer for a UST session.
277 static int create_ust_stream(struct ust_app
*app
,
278 struct ust_app_session
*ua_sess
)
282 ret
= ustctl_create_stream(app
->key
.sock
, ua_sess
->metadata
->obj
,
283 &ua_sess
->metadata
->stream_obj
);
285 ERR("UST create metadata stream failed");
294 * Create the specified channel onto the UST tracer for a UST session.
296 static int create_ust_channel(struct ust_app
*app
,
297 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
)
301 /* TODO: remove cast and use lttng-ust-abi.h */
302 ret
= ustctl_create_channel(app
->key
.sock
, ua_sess
->handle
,
303 (struct lttng_ust_channel_attr
*)&ua_chan
->attr
, &ua_chan
->obj
);
305 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
306 "and session handle %d with ret %d",
307 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
,
308 ua_sess
->handle
, ret
);
312 ua_chan
->handle
= ua_chan
->obj
->handle
;
313 ua_chan
->attr
.shm_fd
= ua_chan
->obj
->shm_fd
;
314 ua_chan
->attr
.wait_fd
= ua_chan
->obj
->wait_fd
;
315 ua_chan
->attr
.memory_map_size
= ua_chan
->obj
->memory_map_size
;
317 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
318 ua_chan
->name
, app
->key
.pid
, app
->key
.sock
);
325 * Create the specified event onto the UST tracer for a UST session.
327 static int create_ust_event(struct ust_app
*app
,
328 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
329 struct ust_app_event
*ua_event
)
333 /* Create UST event on tracer */
334 ret
= ustctl_create_event(app
->key
.sock
, &ua_event
->attr
, ua_chan
->obj
,
337 ERR("Error ustctl create event %s for app pid: %d with ret %d",
338 ua_event
->attr
.name
, app
->key
.pid
, ret
);
342 ua_event
->handle
= ua_event
->obj
->handle
;
343 ua_event
->enabled
= 1;
345 DBG2("UST app event %s created successfully for pid:%d",
346 ua_event
->attr
.name
, app
->key
.pid
);
353 * Alloc new UST app session.
355 static struct ust_app_session
*alloc_ust_app_session(void)
357 struct ust_app_session
*ua_sess
;
359 /* Init most of the default value by allocating and zeroing */
360 ua_sess
= zmalloc(sizeof(struct ust_app_session
));
361 if (ua_sess
== NULL
) {
366 ua_sess
->handle
= -1;
367 ua_sess
->channels
= hashtable_new_str(0);
376 * Alloc new UST app channel.
378 static struct ust_app_channel
*alloc_ust_app_channel(char *name
,
379 struct lttng_ust_channel
*attr
)
381 struct ust_app_channel
*ua_chan
;
383 /* Init most of the default value by allocating and zeroing */
384 ua_chan
= zmalloc(sizeof(struct ust_app_channel
));
385 if (ua_chan
== NULL
) {
390 /* Setup channel name */
391 strncpy(ua_chan
->name
, name
, sizeof(ua_chan
->name
));
392 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
394 ua_chan
->handle
= -1;
395 ua_chan
->ctx
= hashtable_new(0);
396 ua_chan
->events
= hashtable_new_str(0);
397 hashtable_node_init(&ua_chan
->node
, (void *) ua_chan
->name
,
398 strlen(ua_chan
->name
));
400 CDS_INIT_LIST_HEAD(&ua_chan
->streams
.head
);
402 /* Copy attributes */
404 memcpy(&ua_chan
->attr
, attr
, sizeof(ua_chan
->attr
));
407 DBG3("UST app channel %s allocated", ua_chan
->name
);
416 * Alloc new UST app event.
418 static struct ust_app_event
*alloc_ust_app_event(char *name
,
419 struct lttng_ust_event
*attr
)
421 struct ust_app_event
*ua_event
;
423 /* Init most of the default value by allocating and zeroing */
424 ua_event
= zmalloc(sizeof(struct ust_app_event
));
425 if (ua_event
== NULL
) {
430 strncpy(ua_event
->name
, name
, sizeof(ua_event
->name
));
431 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
432 ua_event
->ctx
= hashtable_new(0);
433 hashtable_node_init(&ua_event
->node
, (void *) ua_event
->name
,
434 strlen(ua_event
->name
));
436 /* Copy attributes */
438 memcpy(&ua_event
->attr
, attr
, sizeof(ua_event
->attr
));
441 DBG3("UST app event %s allocated", ua_event
->name
);
450 * Copy data between an UST app event and a LTT event.
452 static void shadow_copy_event(struct ust_app_event
*ua_event
,
453 struct ltt_ust_event
*uevent
)
455 strncpy(ua_event
->name
, uevent
->attr
.name
, sizeof(ua_event
->name
));
456 ua_event
->name
[sizeof(ua_event
->name
) - 1] = '\0';
458 /* Copy event attributes */
459 memcpy(&ua_event
->attr
, &uevent
->attr
, sizeof(ua_event
->attr
));
461 /* TODO: support copy context */
465 * Copy data between an UST app channel and a LTT channel.
467 static void shadow_copy_channel(struct ust_app_channel
*ua_chan
,
468 struct ltt_ust_channel
*uchan
)
470 struct cds_lfht_iter iter
;
471 struct cds_lfht_node
*ua_event_node
;
472 struct ltt_ust_event
*uevent
;
473 struct ust_app_event
*ua_event
;
475 DBG2("Shadow copy of UST app channel %s", ua_chan
->name
);
477 strncpy(ua_chan
->name
, uchan
->name
, sizeof(ua_chan
->name
));
478 ua_chan
->name
[sizeof(ua_chan
->name
) - 1] = '\0';
479 /* Copy event attributes */
480 memcpy(&ua_chan
->attr
, &uchan
->attr
, sizeof(ua_chan
->attr
));
482 /* TODO: support copy context */
484 /* Copy all events from ltt ust channel to ust app channel */
485 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
486 struct cds_lfht_iter uiter
;
488 ua_event_node
= hashtable_lookup(ua_chan
->events
,
489 (void *) uevent
->attr
.name
, strlen(uevent
->attr
.name
),
491 if (ua_event_node
== NULL
) {
492 DBG2("UST event %s not found on shadow copy channel",
494 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
495 if (ua_event
== NULL
) {
498 shadow_copy_event(ua_event
, uevent
);
499 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
503 DBG3("Shadow copy channel done");
507 * Copy data between a UST app session and a regular LTT session.
509 static void shadow_copy_session(struct ust_app_session
*ua_sess
,
510 struct ltt_ust_session
*usess
,
513 struct cds_lfht_node
*ua_chan_node
;
514 struct cds_lfht_iter iter
;
515 struct ltt_ust_channel
*uchan
;
516 struct ust_app_channel
*ua_chan
;
522 /* Get date and time for unique app path */
524 timeinfo
= localtime(&rawtime
);
525 strftime(datetime
, sizeof(datetime
), "%Y%m%d-%H%M%S", timeinfo
);
527 DBG2("Shadow copy of session handle %d", ua_sess
->handle
);
529 ua_sess
->uid
= usess
->uid
;
531 ret
= snprintf(ua_sess
->path
, PATH_MAX
,
533 usess
->pathname
, app
->name
, app
->key
.pid
,
536 PERROR("asprintf UST shadow copy session");
537 /* TODO: We cannot return an error from here.. */
541 /* TODO: support all UST domain */
543 /* Iterate over all channels in global domain. */
544 cds_lfht_for_each_entry(usess
->domain_global
.channels
, &iter
,
546 struct cds_lfht_iter uiter
;
548 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
549 (void *)uchan
->name
, strlen(uchan
->name
),
551 if (ua_chan_node
!= NULL
) {
555 DBG2("Channel %s not found on shadow session copy, creating it",
557 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
558 if (ua_chan
== NULL
) {
559 /* malloc failed... continuing */
563 shadow_copy_channel(ua_chan
, uchan
);
564 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
569 * Return ust app session from the app session hashtable using the UST session
572 static struct ust_app_session
*lookup_session_by_app(
573 struct ltt_ust_session
*usess
, struct ust_app
*app
)
575 struct cds_lfht_iter iter
;
576 struct cds_lfht_node
*node
;
578 /* Get right UST app session from app */
579 node
= hashtable_lookup(app
->sessions
,
580 (void *) ((unsigned long) usess
->uid
), sizeof(void *), &iter
);
585 return caa_container_of(node
, struct ust_app_session
, node
);
592 * Create a UST session onto the tracer of app and add it the session
595 * Return ust app session or NULL on error.
597 static struct ust_app_session
*create_ust_app_session(
598 struct ltt_ust_session
*usess
, struct ust_app
*app
)
601 struct ust_app_session
*ua_sess
;
603 ua_sess
= lookup_session_by_app(usess
, app
);
604 if (ua_sess
== NULL
) {
605 DBG2("UST app pid: %d session uid %d not found, creating it",
606 app
->key
.pid
, usess
->uid
);
607 ua_sess
= alloc_ust_app_session();
608 if (ua_sess
== NULL
) {
609 /* Only malloc can failed so something is really wrong */
612 shadow_copy_session(ua_sess
, usess
, app
);
615 if (ua_sess
->handle
== -1) {
616 ret
= ustctl_create_session(app
->key
.sock
);
618 ERR("Error creating session for app pid %d, sock %d",
619 app
->key
.pid
, app
->key
.sock
);
620 /* TODO: free() ua_sess */
624 DBG2("UST app ustctl create session handle %d", ret
);
625 ua_sess
->handle
= ret
;
627 /* Add ust app session to app's HT */
628 hashtable_node_init(&ua_sess
->node
,
629 (void *)((unsigned long) ua_sess
->uid
), sizeof(void *));
630 hashtable_add_unique(app
->sessions
, &ua_sess
->node
);
632 DBG2("UST app session created successfully with handle %d", ret
);
642 * Create UST app channel and create it on the tracer.
644 static struct ust_app_channel
*create_ust_app_channel(
645 struct ust_app_session
*ua_sess
, struct ltt_ust_channel
*uchan
,
649 struct cds_lfht_iter iter
;
650 struct cds_lfht_node
*ua_chan_node
;
651 struct ust_app_channel
*ua_chan
;
653 /* Lookup channel in the ust app session */
654 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
655 (void *)uchan
->name
, strlen(uchan
->name
), &iter
);
656 if (ua_chan_node
== NULL
) {
657 DBG2("Unable to find channel %s in ust session uid %u",
658 uchan
->name
, ua_sess
->uid
);
659 ua_chan
= alloc_ust_app_channel(uchan
->name
, &uchan
->attr
);
660 if (ua_chan
== NULL
) {
663 shadow_copy_channel(ua_chan
, uchan
);
665 hashtable_add_unique(ua_sess
->channels
, &ua_chan
->node
);
667 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
670 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
682 * Create UST app event and create it on the tracer side.
684 static struct ust_app_event
*create_ust_app_event(
685 struct ust_app_session
*ua_sess
, struct ust_app_channel
*ua_chan
,
686 struct ltt_ust_event
*uevent
, struct ust_app
*app
)
689 struct cds_lfht_iter iter
;
690 struct cds_lfht_node
*ua_event_node
;
691 struct ust_app_event
*ua_event
;
694 ua_event_node
= hashtable_lookup(ua_chan
->events
,
695 (void *)uevent
->attr
.name
, strlen(uevent
->attr
.name
), &iter
);
696 if (ua_event_node
== NULL
) {
697 DBG2("UST app event %s not found, creating it", uevent
->attr
.name
);
698 /* Does not exist so create one */
699 ua_event
= alloc_ust_app_event(uevent
->attr
.name
, &uevent
->attr
);
700 if (ua_event
== NULL
) {
701 /* Only malloc can failed so something is really wrong */
704 shadow_copy_event(ua_event
, uevent
);
706 hashtable_add_unique(ua_chan
->events
, &ua_event
->node
);
708 ua_event
= caa_container_of(ua_event_node
, struct ust_app_event
, node
);
711 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
723 * Create UST metadata and open it on the tracer side.
725 static int create_ust_app_metadata(struct ust_app_session
*ua_sess
,
726 char *pathname
, struct ust_app
*app
)
730 if (ua_sess
->metadata
== NULL
) {
731 /* Allocate UST metadata */
732 ua_sess
->metadata
= trace_ust_create_metadata(pathname
);
733 if (ua_sess
->metadata
== NULL
) {
734 ERR("UST app session %d creating metadata failed",
739 ret
= open_ust_metadata(app
, ua_sess
);
744 DBG2("UST metadata opened for app pid %d", app
->key
.pid
);
747 /* Open UST metadata stream */
748 if (ua_sess
->metadata
->stream_obj
== NULL
) {
749 ret
= create_ust_stream(app
, ua_sess
);
754 ret
= mkdir(ua_sess
->path
, S_IRWXU
| S_IRWXG
);
756 PERROR("mkdir UST metadata");
760 ret
= snprintf(ua_sess
->metadata
->pathname
, PATH_MAX
,
761 "%s/metadata", ua_sess
->path
);
763 PERROR("asprintf UST create stream");
767 DBG2("UST metadata stream object created for app pid %d",
770 ERR("Attempting to create stream without metadata opened");
781 * Return pointer to traceable apps list.
783 struct cds_lfht
*ust_app_get_ht(void)
789 * Return ust app pointer or NULL if not found.
791 struct ust_app
*ust_app_find_by_pid(pid_t pid
)
793 struct cds_lfht_node
*node
;
794 struct cds_lfht_iter iter
;
797 node
= hashtable_lookup(ust_app_ht
,
798 (void *)((unsigned long) pid
), sizeof(void *), &iter
);
800 DBG2("UST app no found with pid %d", pid
);
805 DBG2("Found UST app by pid %d", pid
);
807 return caa_container_of(node
, struct ust_app
, node
);
815 * Using pid and uid (of the app), allocate a new ust_app struct and
816 * add it to the global traceable app list.
818 * On success, return 0, else return malloc ENOMEM.
820 int ust_app_register(struct ust_register_msg
*msg
, int sock
)
824 lta
= zmalloc(sizeof(struct ust_app
));
830 lta
->ppid
= msg
->ppid
;
833 lta
->v_major
= msg
->major
;
834 lta
->v_minor
= msg
->minor
;
835 strncpy(lta
->name
, msg
->name
, sizeof(lta
->name
));
836 lta
->name
[16] = '\0';
837 lta
->sessions
= hashtable_new(0);
840 lta
->key
.pid
= msg
->pid
;
841 hashtable_node_init(<a
->node
, (void *)((unsigned long)lta
->key
.pid
),
843 lta
->key
.sock
= sock
;
844 hashtable_node_init(<a
->key
.node
, (void *)((unsigned long)lta
->key
.sock
),
848 hashtable_add_unique(ust_app_sock_key_map
, <a
->key
.node
);
849 hashtable_add_unique(ust_app_ht
, <a
->node
);
852 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
853 " (version %d.%d)", lta
->key
.pid
, lta
->ppid
, lta
->uid
, lta
->gid
,
854 lta
->key
.sock
, lta
->name
, lta
->v_major
, lta
->v_minor
);
860 * Unregister app by removing it from the global traceable app list and freeing
863 * The socket is already closed at this point so no close to sock.
865 void ust_app_unregister(int sock
)
868 struct cds_lfht_node
*node
;
869 struct cds_lfht_iter iter
;
872 lta
= find_app_by_sock(sock
);
874 ERR("Unregister app sock %d not found!", sock
);
878 DBG("PID %d unregistering with sock %d", lta
->key
.pid
, sock
);
880 /* Get the node reference for a call_rcu */
881 node
= hashtable_lookup(ust_app_ht
,
882 (void *)((unsigned long) lta
->key
.pid
), sizeof(void *), &iter
);
884 ERR("Unable to find app sock %d by pid %d", sock
, lta
->key
.pid
);
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
);
987 ret
= hashtable_del(ust_app_ht
, &iter
);
989 call_rcu(&node
->head
, delete_ust_app_rcu
);
993 hashtable_destroy(ust_app_ht
);
994 hashtable_destroy(ust_app_sock_key_map
);
1000 * Init UST app hash table.
1002 void ust_app_ht_alloc(void)
1004 ust_app_ht
= hashtable_new(0);
1005 ust_app_sock_key_map
= hashtable_new(0);
1009 * For a specific UST session, create the channel for all registered apps.
1011 int ust_app_create_channel_all(struct ltt_ust_session
*usess
,
1012 struct ltt_ust_channel
*uchan
)
1015 struct cds_lfht_iter iter
;
1016 struct ust_app
*app
;
1017 struct ust_app_session
*ua_sess
;
1018 struct ust_app_channel
*ua_chan
;
1020 if (usess
== NULL
|| uchan
== NULL
) {
1021 ERR("Adding UST global channel to NULL values");
1026 DBG2("UST app adding channel %s to global domain for session uid %d",
1027 uchan
->name
, usess
->uid
);
1031 /* For every registered applications */
1032 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1033 /* Create session on the tracer side and add it to app session HT */
1034 ua_sess
= create_ust_app_session(usess
, app
);
1035 if (ua_sess
== NULL
) {
1039 /* Create channel onto application */
1040 ua_chan
= create_ust_app_channel(ua_sess
, uchan
, app
);
1041 if (ua_chan
== NULL
) {
1053 * For a specific UST session and UST channel, create the event for all
1056 int ust_app_create_event_all(struct ltt_ust_session
*usess
,
1057 struct ltt_ust_channel
*uchan
, struct ltt_ust_event
*uevent
)
1060 struct cds_lfht_iter iter
;
1061 struct cds_lfht_node
*ua_chan_node
;
1062 struct ust_app
*app
;
1063 struct ust_app_session
*ua_sess
;
1064 struct ust_app_channel
*ua_chan
;
1065 struct ust_app_event
*ua_event
;
1067 DBG("UST app creating event %s for all apps for session uid %d",
1068 uevent
->attr
.name
, usess
->uid
);
1072 /* For all registered applications */
1073 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1074 struct cds_lfht_iter uiter
;
1076 /* Create session on the tracer side and add it to app session HT */
1077 ua_sess
= create_ust_app_session(usess
, app
);
1078 if (ua_sess
== NULL
) {
1082 /* Lookup channel in the ust app session */
1083 ua_chan_node
= hashtable_lookup(ua_sess
->channels
,
1084 (void *)uchan
->name
, strlen(uchan
->name
),
1086 if (ua_chan_node
== NULL
) {
1087 ERR("Channel %s not found in session uid %d. Skipping",
1088 uchan
->name
, usess
->uid
);
1091 ua_chan
= caa_container_of(ua_chan_node
, struct ust_app_channel
, node
);
1093 ua_event
= create_ust_app_event(ua_sess
, ua_chan
, uevent
, app
);
1094 if (ua_event
== NULL
) {
1105 * Start tracing for a specific UST session and app.
1107 int ust_app_start_trace(struct ltt_ust_session
*usess
, struct ust_app
*app
)
1110 struct cds_lfht_iter iter
;
1111 struct ust_app_session
*ua_sess
;
1112 struct ust_app_channel
*ua_chan
;
1113 struct ltt_ust_stream
*ustream
;
1115 DBG("Starting tracing for ust app pid %d", app
->key
.pid
);
1119 ua_sess
= lookup_session_by_app(usess
, app
);
1120 if (ua_sess
== NULL
) {
1121 /* Only malloc can failed so something is really wrong */
1122 goto error_rcu_unlock
;
1125 ret
= create_ust_app_metadata(ua_sess
, usess
->pathname
, app
);
1127 goto error_rcu_unlock
;
1130 /* For each channel */
1131 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1132 /* Create all streams */
1134 /* Create UST stream */
1135 ustream
= zmalloc(sizeof(*ustream
));
1136 if (ustream
== NULL
) {
1137 PERROR("zmalloc ust stream");
1138 goto error_rcu_unlock
;
1141 ret
= ustctl_create_stream(app
->key
.sock
, ua_chan
->obj
,
1144 /* Got all streams */
1147 ustream
->handle
= ustream
->obj
->handle
;
1149 /* Order is important */
1150 cds_list_add_tail(&ustream
->list
, &ua_chan
->streams
.head
);
1151 ret
= snprintf(ustream
->pathname
, PATH_MAX
, "%s/%s_%u",
1152 ua_sess
->path
, ua_chan
->name
,
1153 ua_chan
->streams
.count
++);
1155 PERROR("asprintf UST create stream");
1158 DBG2("UST stream %d ready at %s", ua_chan
->streams
.count
,
1163 /* Setup UST consumer socket and send fds to it */
1164 ret
= ust_consumer_send_session(ust_consumer_fd
, ua_sess
);
1166 goto error_rcu_unlock
;
1169 /* This start the UST tracing */
1170 ret
= ustctl_start_session(app
->key
.sock
, ua_sess
->handle
);
1172 ERR("Error starting tracing for app pid: %d", app
->key
.pid
);
1173 goto error_rcu_unlock
;
1178 /* Quiescent wait after starting trace */
1179 ustctl_wait_quiescent(app
->key
.sock
);
1189 * Start tracing for the UST session.
1191 int ust_app_start_trace_all(struct ltt_ust_session
*usess
)
1194 struct cds_lfht_iter iter
;
1195 struct ust_app
*app
;
1197 DBG("Starting all UST traces");
1201 cds_lfht_for_each_entry(ust_app_ht
, &iter
, app
, node
) {
1202 ret
= ust_app_start_trace(usess
, app
);
1204 /* Continue to next apps even on error */
1215 * Add channels/events from UST global domain to registered apps at sock.
1217 void ust_app_global_update(struct ltt_ust_session
*usess
, int sock
)
1220 struct cds_lfht_iter iter
;
1221 struct ust_app
*app
;
1222 struct ust_app_session
*ua_sess
;
1223 struct ust_app_channel
*ua_chan
;
1224 struct ust_app_event
*ua_event
;
1226 if (usess
== NULL
) {
1227 ERR("No UST session on global update. Returning");
1231 DBG2("UST app global update for app sock %d for session uid %d", sock
,
1236 app
= find_app_by_sock(sock
);
1238 ERR("Failed to update app sock %d", sock
);
1242 ua_sess
= create_ust_app_session(usess
, app
);
1243 if (ua_sess
== NULL
) {
1248 * We can iterate safely here over all UST app session sicne the create ust
1249 * app session above made a shadow copy of the UST global domain from the
1252 cds_lfht_for_each_entry(ua_sess
->channels
, &iter
, ua_chan
, node
) {
1253 ret
= create_ust_channel(app
, ua_sess
, ua_chan
);
1255 /* FIXME: Should we quit here or continue... */
1259 /* For each events */
1260 cds_lfht_for_each_entry(ua_chan
->events
, &iter
, ua_event
, node
) {
1261 ret
= create_ust_event(app
, ua_sess
, ua_chan
, ua_event
);
1263 /* FIXME: Should we quit here or continue... */
1269 if (usess
->start_trace
) {
1270 ret
= ust_app_start_trace(usess
, app
);
1275 DBG2("UST trace started for app pid %d", app
->key
.pid
);