Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
6 | * as published by the Free Software Foundation; only version 2 |
7 | * of the License. | |
91d76f53 DG |
8 | * |
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. | |
13 | * | |
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. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <errno.h> | |
21 | #include <pthread.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
099e26bd | 24 | #include <string.h> |
aba8e916 DG |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
099e26bd | 27 | #include <unistd.h> |
91d76f53 | 28 | |
1e307fab | 29 | #include <lttngerr.h> |
48842b30 | 30 | #include <lttng-share.h> |
1e307fab | 31 | |
f6a9efaa | 32 | #include "hashtable.h" |
56fff090 | 33 | #include "ust-app.h" |
f6a9efaa | 34 | #include "../hashtable/hash.h" |
48842b30 DG |
35 | #include "ust-ctl.h" |
36 | #include "ust-consumer.h" | |
91d76f53 DG |
37 | |
38 | /* | |
099e26bd | 39 | * Delete a traceable application structure from the global list. |
91d76f53 | 40 | */ |
f6a9efaa | 41 | static void delete_ust_app(struct ust_app *lta) |
91d76f53 | 42 | { |
f6a9efaa DG |
43 | int ret; |
44 | struct cds_lfht_node *node; | |
45 | struct cds_lfht_iter iter; | |
44d3bd01 | 46 | |
f6a9efaa | 47 | rcu_read_lock(); |
44d3bd01 | 48 | |
48842b30 | 49 | free(lta->sessions); |
f6a9efaa | 50 | close(lta->key.sock); |
56fff090 | 51 | |
f6a9efaa DG |
52 | /* Remove from apps hash table */ |
53 | node = hashtable_lookup(ust_app_ht, | |
54 | (void *) ((unsigned long) lta->key.pid), sizeof(void *), &iter); | |
55 | if (node == NULL) { | |
56 | ERR("UST app pid %d not found in hash table", lta->key.pid); | |
57 | } else { | |
58 | ret = hashtable_del(ust_app_ht, &iter); | |
59 | if (ret) { | |
60 | ERR("UST app unable to delete app %d from hash table", | |
61 | lta->key.pid); | |
62 | } else { | |
63 | DBG2("UST app pid %d deleted", lta->key.pid); | |
56fff090 DG |
64 | } |
65 | } | |
66 | ||
f6a9efaa DG |
67 | /* Remove from key hash table */ |
68 | node = hashtable_lookup(ust_app_sock_key_map, | |
69 | (void *) ((unsigned long) lta->key.sock), sizeof(void *), &iter); | |
70 | if (node == NULL) { | |
71 | ERR("UST app key %d not found in key hash table", lta->key.sock); | |
72 | } else { | |
73 | ret = hashtable_del(ust_app_sock_key_map, &iter); | |
74 | if (ret) { | |
75 | ERR("UST app unable to delete app sock %d from key hash table", | |
76 | lta->key.sock); | |
77 | } else { | |
78 | DBG2("UST app pair sock %d key %d deleted", | |
79 | lta->key.sock, lta->key.pid); | |
80 | } | |
81 | } | |
82 | ||
83 | free(lta); | |
84 | ||
85 | rcu_read_unlock(); | |
099e26bd DG |
86 | } |
87 | ||
88 | /* | |
f6a9efaa | 89 | * URCU intermediate call to delete an UST app. |
099e26bd | 90 | */ |
f6a9efaa | 91 | static void delete_ust_app_rcu(struct rcu_head *head) |
099e26bd | 92 | { |
f6a9efaa DG |
93 | struct cds_lfht_node *node = |
94 | caa_container_of(head, struct cds_lfht_node, head); | |
95 | struct ust_app *app = | |
96 | caa_container_of(node, struct ust_app, node); | |
97 | ||
98 | delete_ust_app(app); | |
099e26bd DG |
99 | } |
100 | ||
101 | /* | |
f6a9efaa | 102 | * Find an ust_app using the sock and return it. |
099e26bd | 103 | */ |
f6a9efaa | 104 | static struct ust_app *find_app_by_sock(int sock) |
099e26bd | 105 | { |
f6a9efaa DG |
106 | struct cds_lfht_node *node; |
107 | struct ust_app_key *key; | |
108 | struct cds_lfht_iter iter; | |
f6a9efaa DG |
109 | |
110 | rcu_read_lock(); | |
111 | ||
112 | node = hashtable_lookup(ust_app_sock_key_map, | |
113 | (void *)((unsigned long) sock), sizeof(void *), &iter); | |
114 | if (node == NULL) { | |
115 | DBG2("UST app find by sock %d key not found", sock); | |
116 | rcu_read_unlock(); | |
117 | goto error; | |
118 | } | |
119 | ||
120 | key = caa_container_of(node, struct ust_app_key, node); | |
121 | ||
122 | node = hashtable_lookup(ust_app_ht, | |
123 | (void *)((unsigned long) key->pid), sizeof(void *), &iter); | |
124 | if (node == NULL) { | |
125 | DBG2("UST app find by sock %d not found", sock); | |
126 | rcu_read_unlock(); | |
127 | goto error; | |
128 | } | |
129 | rcu_read_unlock(); | |
130 | ||
131 | return caa_container_of(node, struct ust_app, node); | |
132 | ||
133 | error: | |
134 | return NULL; | |
099e26bd DG |
135 | } |
136 | ||
137 | /* | |
f6a9efaa | 138 | * Return pointer to traceable apps list. |
099e26bd | 139 | */ |
f6a9efaa | 140 | struct cds_lfht *ust_app_get_ht(void) |
099e26bd | 141 | { |
f6a9efaa | 142 | return ust_app_ht; |
91d76f53 DG |
143 | } |
144 | ||
0177d773 | 145 | /* |
f6a9efaa | 146 | * Return ust app pointer or NULL if not found. |
0177d773 | 147 | */ |
f6a9efaa | 148 | struct ust_app *ust_app_find_by_pid(pid_t pid) |
0177d773 | 149 | { |
f6a9efaa DG |
150 | struct cds_lfht_node *node; |
151 | struct cds_lfht_iter iter; | |
0177d773 | 152 | |
f6a9efaa DG |
153 | rcu_read_lock(); |
154 | node = hashtable_lookup(ust_app_ht, | |
155 | (void *)((unsigned long) pid), sizeof(void *), &iter); | |
156 | if (node == NULL) { | |
157 | rcu_read_unlock(); | |
158 | DBG2("UST app no found with pid %d", pid); | |
159 | goto error; | |
0177d773 | 160 | } |
f6a9efaa | 161 | rcu_read_unlock(); |
0177d773 | 162 | |
f6a9efaa | 163 | DBG2("Found UST app by pid %d", pid); |
44d3bd01 | 164 | |
f6a9efaa DG |
165 | return caa_container_of(node, struct ust_app, node); |
166 | ||
167 | error: | |
0177d773 DG |
168 | return NULL; |
169 | } | |
170 | ||
91d76f53 | 171 | /* |
56fff090 | 172 | * Using pid and uid (of the app), allocate a new ust_app struct and |
050349bb | 173 | * add it to the global traceable app list. |
91d76f53 | 174 | * |
050349bb | 175 | * On success, return 0, else return malloc ENOMEM. |
91d76f53 | 176 | */ |
56fff090 | 177 | int ust_app_register(struct ust_register_msg *msg, int sock) |
91d76f53 | 178 | { |
56fff090 | 179 | struct ust_app *lta; |
91d76f53 | 180 | |
56fff090 | 181 | lta = malloc(sizeof(struct ust_app)); |
91d76f53 | 182 | if (lta == NULL) { |
48842b30 | 183 | PERROR("malloc"); |
91d76f53 DG |
184 | return -ENOMEM; |
185 | } | |
186 | ||
099e26bd DG |
187 | lta->uid = msg->uid; |
188 | lta->gid = msg->gid; | |
f6a9efaa | 189 | lta->key.pid = msg->pid; |
099e26bd DG |
190 | lta->ppid = msg->ppid; |
191 | lta->v_major = msg->major; | |
192 | lta->v_minor = msg->minor; | |
f6a9efaa | 193 | lta->key.sock = sock; |
099e26bd DG |
194 | strncpy(lta->name, msg->name, sizeof(lta->name)); |
195 | lta->name[16] = '\0'; | |
f6a9efaa DG |
196 | hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid), |
197 | sizeof(void *)); | |
48842b30 DG |
198 | |
199 | /* Session hashtable */ | |
200 | lta->sessions = hashtable_new(0); | |
f6a9efaa DG |
201 | |
202 | /* Set sock key map */ | |
203 | hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock), | |
204 | sizeof(void *)); | |
099e26bd | 205 | |
f6a9efaa DG |
206 | rcu_read_lock(); |
207 | hashtable_add_unique(ust_app_ht, <a->node); | |
208 | hashtable_add_unique(ust_app_sock_key_map, <a->key.node); | |
209 | rcu_read_unlock(); | |
099e26bd DG |
210 | |
211 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" | |
f6a9efaa DG |
212 | " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid, |
213 | lta->key.sock, lta->name, lta->v_major, lta->v_minor); | |
91d76f53 DG |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
218 | /* | |
050349bb DG |
219 | * Unregister app by removing it from the global traceable app list and freeing |
220 | * the data struct. | |
099e26bd DG |
221 | * |
222 | * The socket is already closed at this point so no close to sock. | |
91d76f53 | 223 | */ |
56fff090 | 224 | void ust_app_unregister(int sock) |
91d76f53 | 225 | { |
56fff090 | 226 | struct ust_app *lta; |
91d76f53 | 227 | |
f6a9efaa DG |
228 | DBG2("UST app unregistering sock %d", sock); |
229 | ||
099e26bd DG |
230 | lta = find_app_by_sock(sock); |
231 | if (lta) { | |
f6a9efaa DG |
232 | DBG("PID %d unregistering with sock %d", lta->key.pid, sock); |
233 | /* FIXME: Better use a call_rcu here ? */ | |
234 | delete_ust_app(lta); | |
91d76f53 DG |
235 | } |
236 | } | |
237 | ||
238 | /* | |
050349bb | 239 | * Return traceable_app_count |
91d76f53 | 240 | */ |
f6a9efaa | 241 | unsigned long ust_app_list_count(void) |
91d76f53 | 242 | { |
f6a9efaa | 243 | unsigned long count; |
91d76f53 | 244 | |
f6a9efaa DG |
245 | rcu_read_lock(); |
246 | count = hashtable_get_count(ust_app_ht); | |
247 | rcu_read_unlock(); | |
91d76f53 | 248 | |
099e26bd | 249 | return count; |
91d76f53 DG |
250 | } |
251 | ||
252 | /* | |
099e26bd | 253 | * Free and clean all traceable apps of the global list. |
91d76f53 | 254 | */ |
56fff090 | 255 | void ust_app_clean_list(void) |
91d76f53 | 256 | { |
f6a9efaa DG |
257 | int ret; |
258 | struct cds_lfht_node *node; | |
259 | struct cds_lfht_iter iter; | |
260 | ||
261 | DBG2("UST app clean hash table"); | |
262 | ||
263 | rcu_read_lock(); | |
264 | ||
265 | hashtable_get_first(ust_app_ht, &iter); | |
266 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
267 | ret = hashtable_del(ust_app_ht, &iter); | |
268 | if (!ret) { | |
269 | call_rcu(&node->head, delete_ust_app_rcu); | |
270 | } | |
271 | hashtable_get_next(ust_app_ht, &iter); | |
91d76f53 | 272 | } |
f6a9efaa DG |
273 | |
274 | rcu_read_unlock(); | |
275 | } | |
276 | ||
277 | /* | |
278 | * Init UST app hash table. | |
279 | */ | |
280 | void ust_app_ht_alloc(void) | |
281 | { | |
282 | ust_app_ht = hashtable_new(0); | |
283 | ust_app_sock_key_map = hashtable_new(0); | |
91d76f53 | 284 | } |
48842b30 DG |
285 | |
286 | /* | |
287 | * Alloc new UST app session. | |
288 | */ | |
289 | static struct ust_app_session *alloc_app_session(void) | |
290 | { | |
291 | struct ust_app_session *ua_sess; | |
292 | ||
293 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
294 | if (ua_sess == NULL) { | |
295 | PERROR("malloc"); | |
296 | goto error; | |
297 | } | |
298 | ||
299 | ua_sess->enabled = 0; | |
300 | ua_sess->handle = -1; | |
301 | ua_sess->channels = hashtable_new_str(0); | |
302 | ua_sess->metadata = NULL; | |
303 | ua_sess->obj = NULL; | |
304 | ||
305 | return ua_sess; | |
306 | ||
307 | error: | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | static struct ust_app_channel *alloc_app_channel(char *name) | |
312 | { | |
313 | struct ust_app_channel *ua_chan; | |
314 | ||
315 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
316 | if (ua_chan == NULL) { | |
317 | PERROR("malloc"); | |
318 | goto error; | |
319 | } | |
320 | ||
321 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
322 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
323 | ua_chan->enabled = 0; | |
324 | ua_chan->handle = -1; | |
325 | ua_chan->obj = NULL; | |
326 | ua_chan->ctx = hashtable_new(0); | |
5af2f756 | 327 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); |
48842b30 DG |
328 | ua_chan->events = hashtable_new_str(0); |
329 | hashtable_node_init(&ua_chan->node, (void *) ua_chan->name, | |
330 | strlen(ua_chan->name)); | |
331 | ||
332 | DBG3("UST app channel %s allocated", ua_chan->name); | |
333 | ||
334 | return ua_chan; | |
335 | ||
336 | error: | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | static struct ust_app_event *alloc_app_event(char *name) | |
341 | { | |
342 | struct ust_app_event *ua_event; | |
343 | ||
344 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
345 | if (ua_event == NULL) { | |
346 | PERROR("malloc"); | |
347 | goto error; | |
348 | } | |
349 | ||
350 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
351 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
352 | ua_event->ctx = hashtable_new(0); | |
353 | hashtable_node_init(&ua_event->node, (void *) ua_event->name, | |
354 | strlen(ua_event->name)); | |
355 | ||
356 | DBG3("UST app event %s allocated", ua_event->name); | |
357 | ||
358 | return ua_event; | |
359 | ||
360 | error: | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | static void shallow_copy_event(struct ust_app_event *ua_event, | |
365 | struct ltt_ust_event *uevent) | |
366 | { | |
367 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); | |
368 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
369 | ||
370 | /* TODO: support copy context */ | |
371 | } | |
372 | ||
373 | static void shallow_copy_channel(struct ust_app_channel *ua_chan, | |
374 | struct ltt_ust_channel *uchan) | |
375 | { | |
376 | struct cds_lfht_iter iter; | |
377 | struct cds_lfht_node *node, *ua_event_node; | |
378 | struct ltt_ust_event *uevent; | |
379 | struct ust_app_event *ua_event; | |
380 | ||
381 | DBG2("Shallow copy of UST app channel %s", ua_chan->name); | |
382 | ||
383 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
384 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
385 | ||
386 | /* TODO: support copy context */ | |
387 | ||
388 | hashtable_get_first(uchan->events, &iter); | |
389 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
390 | uevent = caa_container_of(node, struct ltt_ust_event, node); | |
391 | ||
392 | ua_event_node = hashtable_lookup(ua_chan->events, | |
393 | (void *) uevent->attr.name, strlen(uevent->attr.name), &iter); | |
394 | if (ua_event_node == NULL) { | |
395 | DBG2("UST event %s not found on shallow copy channel", | |
396 | uevent->attr.name); | |
397 | ua_event = alloc_app_event(uevent->attr.name); | |
398 | if (ua_event == NULL) { | |
399 | continue; | |
400 | } | |
401 | hashtable_add_unique(ua_chan->events, &ua_event->node); | |
402 | } else { | |
403 | ua_event = caa_container_of(node, struct ust_app_event, node); | |
404 | } | |
405 | ||
406 | shallow_copy_event(ua_event, uevent); | |
407 | ||
408 | /* Get next UST events */ | |
409 | hashtable_get_next(uchan->events, &iter); | |
410 | } | |
411 | ||
412 | DBG3("Shallow copy channel done"); | |
413 | } | |
414 | ||
415 | static void shallow_copy_session(struct ust_app_session *ua_sess, | |
416 | struct ltt_ust_session *usess) | |
417 | { | |
418 | struct cds_lfht_node *node, *ua_chan_node; | |
419 | struct cds_lfht_iter iter; | |
420 | struct ltt_ust_channel *uchan; | |
421 | struct ust_app_channel *ua_chan; | |
422 | ||
423 | DBG2("Shallow copy of session handle"); | |
424 | ||
425 | ua_sess->uid = usess->uid; | |
426 | ||
427 | /* TODO: support all UST domain */ | |
428 | ||
429 | /* Iterate over all channels in global domain. */ | |
430 | hashtable_get_first(usess->domain_global.channels, &iter); | |
431 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
432 | uchan = caa_container_of(node, struct ltt_ust_channel, node); | |
433 | ||
434 | ua_chan_node = hashtable_lookup(ua_sess->channels, | |
435 | (void *) uchan->name, strlen(uchan->name), &iter); | |
436 | if (ua_chan_node == NULL) { | |
437 | DBG2("Channel %s not found on shallow session copy, creating it", | |
438 | uchan->name); | |
439 | ua_chan = alloc_app_channel(uchan->name); | |
440 | if (ua_chan == NULL) { | |
441 | /* malloc failed... continuing */ | |
442 | continue; | |
443 | } | |
444 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); | |
445 | } else { | |
446 | ua_chan = caa_container_of(node, struct ust_app_channel, node); | |
447 | } | |
448 | ||
449 | shallow_copy_channel(ua_chan, uchan); | |
450 | ||
451 | /* Next item in hash table */ | |
452 | hashtable_get_next(usess->domain_global.channels, &iter); | |
453 | } | |
454 | } | |
455 | ||
456 | static struct ust_app_session *lookup_session_by_app( | |
457 | struct ltt_ust_session *usess, struct ust_app *app) | |
458 | { | |
459 | struct cds_lfht_iter iter; | |
460 | struct cds_lfht_node *node; | |
461 | ||
462 | /* Get right UST app session from app */ | |
463 | node = hashtable_lookup(app->sessions, | |
464 | (void *) ((unsigned long) usess->uid), | |
465 | sizeof(void *), &iter); | |
466 | if (node == NULL) { | |
467 | goto error; | |
468 | } | |
469 | ||
470 | return caa_container_of(node, struct ust_app_session, node); | |
471 | ||
472 | error: | |
473 | return NULL; | |
474 | } | |
475 | ||
476 | int ust_app_add_channel(struct ltt_ust_session *usess, | |
477 | struct ltt_ust_channel *uchan) | |
478 | { | |
479 | int ret = 0; | |
480 | struct cds_lfht_iter iter; | |
481 | struct cds_lfht_node *node, *ua_chan_node; | |
482 | struct ust_app *app; | |
483 | struct ust_app_session *ua_sess; | |
484 | struct ust_app_channel *ua_chan; | |
485 | ||
486 | DBG2("UST app adding channel %s to global domain for session uid %d", | |
487 | uchan->name, usess->uid); | |
488 | ||
489 | rcu_read_lock(); | |
490 | hashtable_get_first(ust_app_ht, &iter); | |
491 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
492 | app = caa_container_of(node, struct ust_app, node); | |
493 | ||
494 | ua_sess = lookup_session_by_app(usess, app); | |
495 | if (ua_sess == NULL) { | |
496 | DBG2("UST app pid: %d session uid %d not found, creating one", | |
497 | app->key.pid, usess->uid); | |
498 | ua_sess = alloc_app_session(); | |
499 | if (ua_sess == NULL) { | |
500 | /* Only malloc can failed so something is really wrong */ | |
501 | goto next; | |
502 | } | |
503 | shallow_copy_session(ua_sess, usess); | |
504 | } | |
505 | ||
506 | if (ua_sess->handle == -1) { | |
507 | ret = ustctl_create_session(app->key.sock); | |
508 | if (ret < 0) { | |
509 | DBG("Error creating session for app pid %d, sock %d", | |
510 | app->key.pid, app->key.sock); | |
511 | /* TODO: free() ua_sess */ | |
512 | goto next; | |
513 | } | |
514 | ||
515 | DBG2("UST app ustctl create session handle %d", ret); | |
516 | ua_sess->handle = ret; | |
517 | ||
518 | /* Add ust app session to app's HT */ | |
519 | hashtable_node_init(&ua_sess->node, | |
520 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); | |
521 | hashtable_add_unique(app->sessions, &ua_sess->node); | |
522 | } | |
523 | ||
524 | /* Lookup channel in the ust app session */ | |
525 | ua_chan_node = hashtable_lookup(ua_sess->channels, | |
526 | (void *) uchan->name, strlen(uchan->name), &iter); | |
527 | if (ua_chan_node == NULL) { | |
528 | ERR("Channel suppose to be present with the above shallow " | |
529 | "session copy. Continuing..."); | |
530 | goto next; | |
531 | } | |
532 | ||
533 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
534 | ||
535 | /* TODO: remove cast and use lttng-ust-abi.h */ | |
536 | ret = ustctl_create_channel(app->key.sock, ua_sess->handle, | |
537 | (struct lttng_ust_channel_attr *)&uchan->attr, &ua_chan->obj); | |
538 | if (ret < 0) { | |
539 | DBG("Error creating channel %s for app (pid: %d, sock: %d) " | |
540 | "and session handle %d with ret %d", | |
541 | uchan->name, app->key.pid, app->key.sock, | |
542 | ua_sess->handle, ret); | |
543 | goto next; | |
544 | } | |
545 | ||
546 | ua_chan->handle = ua_chan->obj->handle; | |
547 | ua_chan->attr.shm_fd = ua_chan->obj->shm_fd; | |
548 | ua_chan->attr.wait_fd = ua_chan->obj->wait_fd; | |
549 | ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size; | |
550 | ||
551 | DBG2("Channel %s UST create successfully for pid:%d and sock:%d", | |
552 | uchan->name, app->key.pid, app->key.sock); | |
553 | ||
554 | next: | |
555 | /* Next applications */ | |
556 | hashtable_get_next(ust_app_ht, &iter); | |
557 | } | |
558 | rcu_read_unlock(); | |
559 | ||
560 | return ret; | |
561 | } | |
562 | ||
563 | int ust_app_add_event(struct ltt_ust_session *usess, | |
564 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
565 | { | |
566 | int ret = 0; | |
567 | struct cds_lfht_iter iter; | |
568 | struct cds_lfht_node *node, *ua_chan_node, *ua_event_node; | |
569 | struct ust_app *app; | |
570 | struct ust_app_session *ua_sess; | |
571 | struct ust_app_channel *ua_chan; | |
572 | struct ust_app_event *ua_event; | |
573 | struct lttng_ust_event ltt_uevent; | |
13161846 | 574 | struct lttng_ust_object_data *obj_event; |
48842b30 DG |
575 | |
576 | DBG2("UST app adding event %s to global domain for session uid %d", | |
577 | uevent->attr.name, usess->uid); | |
578 | ||
579 | rcu_read_lock(); | |
580 | hashtable_get_first(ust_app_ht, &iter); | |
581 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
582 | app = caa_container_of(node, struct ust_app, node); | |
583 | ||
584 | ua_sess = lookup_session_by_app(usess, app); | |
585 | if (ua_sess == NULL) { | |
586 | DBG2("UST app (pid: %d, sock: %d) session not found, creating one", | |
587 | app->key.pid, app->key.sock); | |
588 | ua_sess = alloc_app_session(); | |
589 | if (ua_sess == NULL) { | |
590 | /* Only malloc can failed so something is really wrong */ | |
591 | goto next; | |
592 | } | |
593 | shallow_copy_session(ua_sess, usess); | |
594 | } | |
595 | ||
596 | if (ua_sess->handle == -1) { | |
597 | ret = ustctl_create_session(app->key.sock); | |
598 | if (ret < 0) { | |
599 | DBG("Error creating session for app pid %d, sock %d", | |
600 | app->key.pid, app->key.sock); | |
601 | /* TODO: free() ua_sess */ | |
602 | goto next; | |
603 | } | |
604 | ||
605 | DBG2("UST app ustctl create session handle %d", ret); | |
606 | ua_sess->handle = ret; | |
607 | /* Add ust app session to app's HT */ | |
608 | hashtable_node_init(&ua_sess->node, | |
609 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); | |
610 | hashtable_add_unique(app->sessions, &ua_sess->node); | |
611 | } | |
612 | ||
613 | /* Lookup channel in the ust app session */ | |
614 | ua_chan_node = hashtable_lookup(ua_sess->channels, | |
615 | (void *) uchan->name, strlen(uchan->name), &iter); | |
616 | if (ua_chan_node == NULL) { | |
617 | ERR("Channel suppose to be present with the above shallow " | |
618 | "session copy. Continuing..."); | |
619 | goto next; | |
620 | } | |
621 | ||
622 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
623 | ||
624 | /* Prepare lttng ust event */ | |
625 | strncpy(ltt_uevent.name, uevent->attr.name, sizeof(ltt_uevent.name)); | |
626 | ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0'; | |
627 | /* TODO: adjust to other instrumentation types */ | |
628 | ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT; | |
629 | ||
630 | /* Get event node */ | |
631 | ua_event_node = hashtable_lookup(ua_chan->events, | |
632 | (void *) uevent->attr.name, strlen(uevent->attr.name), &iter); | |
633 | if (ua_event_node == NULL) { | |
634 | DBG2("UST app event %s not found, creating one", uevent->attr.name); | |
635 | /* Does not exist so create one */ | |
636 | ua_event = alloc_app_event(uevent->attr.name); | |
637 | if (ua_event == NULL) { | |
638 | /* Only malloc can failed so something is really wrong */ | |
639 | goto next; | |
640 | } | |
641 | ||
642 | shallow_copy_event(ua_event, uevent); | |
643 | ||
644 | /* Create UST event on tracer */ | |
645 | ret = ustctl_create_event(app->key.sock, <t_uevent, ua_chan->obj, | |
646 | &obj_event); | |
647 | if (ret < 0) { | |
648 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
649 | uevent->attr.name, app->key.pid, ret); | |
650 | /* TODO: free() ua_event and obj_event */ | |
651 | goto next; | |
652 | } | |
653 | ua_event->obj = obj_event; | |
654 | ua_event->handle = obj_event->handle; | |
655 | ua_event->enabled = 1; | |
656 | } else { | |
657 | ua_event = caa_container_of(ua_event_node, | |
658 | struct ust_app_event, node); | |
659 | ||
660 | if (ua_event->enabled == 0) { | |
661 | ret = ustctl_enable(app->key.sock, ua_event->obj); | |
662 | if (ret < 0) { | |
663 | ERR("Error ustctl enable event %s for app " | |
664 | "pid: %d with ret %d", uevent->attr.name, | |
665 | app->key.pid, ret); | |
666 | goto next; | |
667 | } | |
668 | ua_event->enabled = 1; | |
669 | } | |
670 | } | |
671 | ||
672 | hashtable_add_unique(ua_chan->events, &ua_event->node); | |
673 | ||
674 | DBG2("Event %s UST create successfully for pid:%d", uevent->attr.name, | |
675 | app->key.pid); | |
676 | ||
677 | next: | |
678 | /* Next applications */ | |
679 | hashtable_get_next(ust_app_ht, &iter); | |
680 | } | |
681 | rcu_read_unlock(); | |
682 | ||
683 | return ret; | |
684 | } | |
685 | ||
686 | int ust_app_start_trace(struct ltt_ust_session *usess) | |
687 | { | |
688 | int ret = 0; | |
689 | struct cds_lfht_iter iter; | |
690 | struct cds_lfht_node *node, *ua_chan_node; | |
691 | struct ust_app *app; | |
692 | struct ust_app_session *ua_sess; | |
693 | struct ust_app_channel *ua_chan; | |
694 | struct lttng_ust_channel_attr uattr; | |
695 | struct ltt_ust_channel *uchan; | |
696 | ||
5cf5d0e7 DG |
697 | DBG("Starting all UST traces"); |
698 | ||
48842b30 DG |
699 | rcu_read_lock(); |
700 | hashtable_get_first(ust_app_ht, &iter); | |
701 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
702 | app = caa_container_of(node, struct ust_app, node); | |
703 | ||
704 | ua_sess = lookup_session_by_app(usess, app); | |
705 | if (ua_sess == NULL) { | |
706 | /* Only malloc can failed so something is really wrong */ | |
707 | goto next; | |
708 | } | |
709 | ||
710 | if (ua_sess->metadata == NULL) { | |
711 | /* Allocate UST metadata */ | |
712 | ua_sess->metadata = trace_ust_create_metadata(usess->pathname); | |
713 | if (ua_sess->metadata == NULL) { | |
714 | ERR("UST app session %d creating metadata failed", | |
715 | ua_sess->handle); | |
716 | goto next; | |
717 | } | |
718 | ||
719 | uattr.overwrite = ua_sess->metadata->attr.overwrite; | |
720 | uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size; | |
721 | uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf; | |
722 | uattr.switch_timer_interval = | |
723 | ua_sess->metadata->attr.switch_timer_interval; | |
724 | uattr.read_timer_interval = | |
725 | ua_sess->metadata->attr.read_timer_interval; | |
726 | uattr.output = ua_sess->metadata->attr.output; | |
727 | ||
728 | /* UST tracer metadata creation */ | |
729 | ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr, | |
730 | &ua_sess->metadata->obj); | |
731 | if (ret < 0) { | |
732 | ERR("UST app open metadata failed for app pid:%d", | |
733 | app->key.pid); | |
734 | goto next; | |
735 | } | |
736 | ||
737 | DBG2("UST metadata opened for app pid %d", app->key.pid); | |
738 | } | |
739 | ||
740 | /* Open UST metadata stream */ | |
741 | if (ua_sess->metadata->stream_obj == NULL) { | |
742 | ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj, | |
743 | &ua_sess->metadata->stream_obj); | |
744 | if (ret < 0) { | |
745 | ERR("UST create metadata stream failed"); | |
746 | goto next; | |
747 | } | |
748 | ||
aba8e916 DG |
749 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d", |
750 | usess->pathname, app->name, app->key.pid); | |
751 | if (ret < 0) { | |
752 | PERROR("asprintf UST create stream"); | |
753 | goto next; | |
754 | } | |
755 | ||
756 | ret = mkdir(ua_sess->metadata->pathname, S_IRWXU | S_IRWXG); | |
757 | if (ret < 0) { | |
758 | goto next; | |
759 | } | |
760 | ||
f348bb5e DG |
761 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d/metadata", |
762 | usess->pathname, app->name, app->key.pid); | |
48842b30 DG |
763 | if (ret < 0) { |
764 | PERROR("asprintf UST create stream"); | |
765 | goto next; | |
766 | } | |
767 | ||
768 | DBG2("UST metadata stream object created for app pid %d", | |
769 | app->key.pid); | |
770 | } | |
771 | ||
772 | /* For each channel */ | |
773 | hashtable_get_first(usess->domain_global.channels, &iter); | |
774 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
775 | uchan = caa_container_of(node, struct ltt_ust_channel, node); | |
776 | ||
777 | /* Lookup channel in the ust app session */ | |
778 | ua_chan_node = hashtable_lookup(ua_sess->channels, | |
779 | (void *) uchan->name, strlen(uchan->name), &iter); | |
780 | if (ua_chan_node == NULL) { | |
781 | ERR("Channel suppose to be present with the above shallow " | |
782 | "session copy. Continuing..."); | |
783 | goto next; | |
784 | } | |
785 | ||
786 | ua_chan = caa_container_of(ua_chan_node, | |
787 | struct ust_app_channel, node); | |
788 | ||
a220deea MD |
789 | for (;;) { |
790 | struct lttng_ust_object_data *obj; | |
791 | struct ltt_ust_stream *ustream; | |
48842b30 | 792 | |
a220deea MD |
793 | ret = ustctl_create_stream(app->key.sock, ua_chan->obj, |
794 | &obj); | |
795 | if (ret < 0) { | |
796 | /* Got all streams */ | |
797 | goto next_chan; | |
798 | } | |
48842b30 | 799 | |
a220deea MD |
800 | ustream = malloc(sizeof(*ustream)); |
801 | if (ustream == NULL) { | |
802 | goto next_chan; | |
803 | } | |
804 | memset(ustream, 0, sizeof(struct ltt_ust_stream)); | |
805 | ustream->obj = obj; | |
806 | ustream->handle = ustream->obj->handle; | |
5af2f756 MD |
807 | /* Order is important */ |
808 | cds_list_add_tail(&ustream->list, &ua_chan->streams.head); | |
aba8e916 DG |
809 | ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s-%d/%s_%u", |
810 | usess->pathname, app->name, app->key.pid, | |
811 | uchan->name, ua_chan->streams.count++); | |
a220deea MD |
812 | if (ret < 0) { |
813 | PERROR("asprintf UST create stream"); | |
814 | goto next_chan; | |
815 | } | |
48842b30 DG |
816 | } |
817 | ||
818 | next_chan: | |
819 | /* Next applications */ | |
820 | hashtable_get_next(ua_sess->channels, &iter); | |
821 | } | |
822 | ||
823 | /* Setup UST consumer socket and send fds to it */ | |
48842b30 DG |
824 | ret = ust_consumer_send_session(usess->consumer_fd, ua_sess); |
825 | if (ret < 0) { | |
826 | goto next; | |
827 | } | |
828 | ||
829 | /* This start the UST tracing */ | |
830 | ret = ustctl_start_session(app->key.sock, ua_sess->handle); | |
831 | if (ret < 0) { | |
832 | ERR("Error starting tracing for app pid: %d", app->key.pid); | |
833 | goto next; | |
834 | } | |
835 | ||
836 | /* Quiescent wait after starting trace */ | |
837 | ustctl_wait_quiescent(app->key.sock); | |
838 | next: | |
839 | /* Next applications */ | |
840 | hashtable_get_next(ust_app_ht, &iter); | |
841 | } | |
842 | rcu_read_unlock(); | |
843 | ||
844 | return 0; | |
845 | } | |
487cf67c DG |
846 | |
847 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) | |
848 | { | |
849 | int ret = 0; | |
850 | int session_existed = 1; | |
851 | struct cds_lfht_iter iter; | |
852 | struct cds_lfht_node *node, *ua_chan_node; | |
853 | struct ust_app *app; | |
854 | struct ust_app_session *ua_sess; | |
855 | struct ust_app_channel *ua_chan; | |
856 | struct ust_app_event *ua_event; | |
857 | struct lttng_ust_event ltt_uevent; | |
858 | struct ltt_ust_channel *uchan; | |
859 | struct lttng_ust_object_data *obj_event; | |
36dc12cc | 860 | struct lttng_ust_channel_attr uattr; |
487cf67c | 861 | |
1f3580c7 DG |
862 | rcu_read_lock(); |
863 | ||
864 | if (usess == NULL) { | |
865 | DBG2("No UST session on global update. Returning"); | |
866 | goto error; | |
867 | } | |
868 | ||
487cf67c DG |
869 | DBG2("UST app global update for app sock %d for session uid %d", sock, |
870 | usess->uid); | |
871 | ||
487cf67c DG |
872 | app = find_app_by_sock(sock); |
873 | if (app == NULL) { | |
874 | ERR("Failed to update app sock %d", sock); | |
875 | goto error; | |
876 | } | |
877 | ||
878 | ua_sess = lookup_session_by_app(usess, app); | |
879 | if (ua_sess == NULL) { | |
880 | DBG2("UST app pid: %d session uid %d not found, creating one", | |
881 | app->key.pid, usess->uid); | |
882 | ua_sess = alloc_app_session(); | |
883 | if (ua_sess == NULL) { | |
884 | /* Only malloc can failed so something is really wrong */ | |
885 | goto error; | |
886 | } | |
887 | shallow_copy_session(ua_sess, usess); | |
888 | session_existed= 0; | |
889 | } | |
890 | ||
891 | if (ua_sess->handle == -1) { | |
892 | ret = ustctl_create_session(app->key.sock); | |
893 | if (ret < 0) { | |
894 | DBG("Error creating session for app pid %d, sock %d", | |
895 | app->key.pid, app->key.sock); | |
896 | /* TODO: free() ua_sess */ | |
897 | goto error; | |
898 | } | |
899 | ||
900 | DBG2("UST app ustctl create session handle %d", ret); | |
901 | ua_sess->handle = ret; | |
902 | ||
903 | /* Add ust app session to app's HT */ | |
904 | hashtable_node_init(&ua_sess->node, | |
905 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); | |
906 | hashtable_add_unique(app->sessions, &ua_sess->node); | |
907 | } | |
908 | ||
909 | if (session_existed) { | |
910 | goto error; | |
911 | } | |
912 | ||
aba8e916 DG |
913 | if (ua_sess->metadata == NULL) { |
914 | /* Allocate UST metadata */ | |
915 | ua_sess->metadata = trace_ust_create_metadata(usess->pathname); | |
916 | if (ua_sess->metadata == NULL) { | |
917 | ERR("UST app session %d creating metadata failed", | |
918 | ua_sess->handle); | |
919 | goto error; | |
920 | } | |
921 | ||
922 | uattr.overwrite = ua_sess->metadata->attr.overwrite; | |
923 | uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size; | |
924 | uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf; | |
925 | uattr.switch_timer_interval = | |
926 | ua_sess->metadata->attr.switch_timer_interval; | |
927 | uattr.read_timer_interval = | |
928 | ua_sess->metadata->attr.read_timer_interval; | |
929 | uattr.output = ua_sess->metadata->attr.output; | |
930 | ||
931 | /* UST tracer metadata creation */ | |
932 | ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr, | |
933 | &ua_sess->metadata->obj); | |
934 | if (ret < 0) { | |
935 | ERR("UST app open metadata failed for app pid:%d", | |
936 | app->key.pid); | |
937 | goto error; | |
938 | } | |
939 | ||
940 | DBG2("UST metadata opened for app pid %d", app->key.pid); | |
941 | } | |
942 | ||
943 | /* Open UST metadata stream */ | |
944 | if (ua_sess->metadata->stream_obj == NULL) { | |
945 | ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj, | |
946 | &ua_sess->metadata->stream_obj); | |
947 | if (ret < 0) { | |
948 | ERR("UST create metadata stream failed"); | |
949 | goto error; | |
950 | } | |
951 | ||
952 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d", | |
953 | usess->pathname, app->name, app->key.pid); | |
954 | if (ret < 0) { | |
955 | PERROR("asprintf UST create stream"); | |
956 | goto error; | |
957 | } | |
958 | ||
959 | ret = mkdir(ua_sess->metadata->pathname, S_IRWXU | S_IRWXG); | |
960 | if (ret < 0) { | |
961 | PERROR("mkdir UST metadata"); | |
962 | goto error; | |
963 | } | |
964 | ||
f348bb5e DG |
965 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d/metadata", |
966 | usess->pathname, app->name, app->key.pid); | |
aba8e916 DG |
967 | if (ret < 0) { |
968 | PERROR("asprintf UST create stream"); | |
969 | goto error; | |
970 | } | |
971 | ||
972 | DBG2("UST metadata stream object created for app pid %d", | |
973 | app->key.pid); | |
974 | } | |
975 | ||
976 | ||
487cf67c DG |
977 | /* Iterate over all channels */ |
978 | hashtable_get_first(usess->domain_global.channels, &iter); | |
979 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
980 | uchan = caa_container_of(node, struct ltt_ust_channel, node); | |
981 | ||
982 | /* Lookup channel in the ust app session */ | |
983 | ua_chan_node = hashtable_lookup(ua_sess->channels, | |
984 | (void *) uchan->name, strlen(uchan->name), &iter); | |
985 | if (ua_chan_node == NULL) { | |
986 | ERR("UST app channel not found for uchan %s", uchan->name); | |
987 | goto next_chan; | |
988 | } | |
989 | ||
990 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
991 | ||
992 | /* TODO: remove cast and use lttng-ust-abi.h */ | |
993 | ret = ustctl_create_channel(app->key.sock, ua_sess->handle, | |
994 | (struct lttng_ust_channel_attr *)&uchan->attr, &ua_chan->obj); | |
995 | if (ret < 0) { | |
996 | DBG("Error creating channel %s for app (pid: %d, sock: %d) " | |
997 | "and session handle %d with ret %d", | |
998 | uchan->name, app->key.pid, app->key.sock, | |
999 | ua_sess->handle, ret); | |
1000 | goto next_chan; | |
1001 | } | |
1002 | ||
1003 | ua_chan->handle = ua_chan->obj->handle; | |
1004 | ua_chan->attr.shm_fd = ua_chan->obj->shm_fd; | |
1005 | ua_chan->attr.wait_fd = ua_chan->obj->wait_fd; | |
1006 | ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size; | |
1007 | ||
1008 | DBG2("Channel %s UST create successfully for pid:%d and sock:%d", | |
1009 | uchan->name, app->key.pid, app->key.sock); | |
1010 | ||
1011 | /* For each event(s) of that channel */ | |
1012 | hashtable_get_first(ua_chan->events, &iter); | |
1013 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { | |
1014 | ua_event = caa_container_of(node, struct ust_app_event, node); | |
1015 | ||
1016 | /* Prepare lttng ust event */ | |
1017 | memset(<t_uevent, 0, sizeof(ltt_uevent)); | |
1018 | strncpy(ltt_uevent.name, ua_event->name, sizeof(ltt_uevent.name)); | |
1019 | ltt_uevent.name[sizeof(ltt_uevent.name) - 1] = '\0'; | |
1020 | ||
1021 | /* TODO: adjust to other instrumentation types */ | |
1022 | ltt_uevent.instrumentation = LTTNG_UST_TRACEPOINT; | |
1023 | ||
1024 | /* Create UST event on tracer */ | |
1025 | ret = ustctl_create_event(app->key.sock, <t_uevent, ua_chan->obj, | |
1026 | &obj_event); | |
1027 | if (ret < 0) { | |
1028 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1029 | ua_event->name, app->key.pid, ret); | |
1030 | /* TODO: free() ua_event and obj_event */ | |
1031 | goto next_event; | |
1032 | } | |
1033 | ||
1034 | ua_event->obj = obj_event; | |
1035 | ua_event->handle = obj_event->handle; | |
1036 | ua_event->enabled = 1; | |
1037 | ||
1038 | DBG2("Event %s UST create successfully for pid:%d", | |
1039 | ua_event->name, app->key.pid); | |
1040 | ||
1041 | next_event: | |
1042 | hashtable_get_next(ua_chan->events, &iter); | |
1043 | } | |
1044 | ||
36dc12cc DG |
1045 | for (;;) { |
1046 | struct lttng_ust_object_data *obj; | |
1047 | struct ltt_ust_stream *ustream; | |
1048 | ||
1049 | ret = ustctl_create_stream(app->key.sock, ua_chan->obj, &obj); | |
1050 | if (ret < 0) { | |
1051 | /* Got all streams */ | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | ustream = zmalloc(sizeof(*ustream)); | |
1056 | if (ustream == NULL) { | |
1057 | PERROR("zmalloc ust stream"); | |
1058 | goto error; | |
1059 | } | |
1060 | ||
1061 | ustream->obj = obj; | |
1062 | ustream->handle = ustream->obj->handle; | |
1063 | /* Order is important */ | |
1064 | cds_list_add_tail(&ustream->list, &ua_chan->streams.head); | |
1065 | ||
aba8e916 DG |
1066 | ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s-%d/%s_%u", |
1067 | usess->pathname, app->name, app->key.pid, | |
1068 | uchan->name, ua_chan->streams.count++); | |
36dc12cc DG |
1069 | if (ret < 0) { |
1070 | PERROR("asprintf UST create stream"); | |
1071 | goto error; | |
1072 | } | |
1073 | } | |
1074 | ||
487cf67c DG |
1075 | next_chan: |
1076 | /* Next applications */ | |
1077 | hashtable_get_next(ua_sess->channels, &iter); | |
1078 | } | |
1079 | ||
36dc12cc DG |
1080 | if (usess->start_trace) { |
1081 | /* Setup UST consumer socket and send fds to it */ | |
1082 | ret = ust_consumer_send_session(usess->consumer_fd, ua_sess); | |
1083 | if (ret < 0) { | |
1084 | ERR("UST consumer send session failed"); | |
1085 | goto error; | |
1086 | } | |
1087 | ||
1088 | /* This start the UST tracing */ | |
1089 | ret = ustctl_start_session(app->key.sock, ua_sess->handle); | |
1090 | if (ret < 0) { | |
1091 | ERR("Error starting tracing for app pid: %d", app->key.pid); | |
1092 | goto error; | |
1093 | } | |
1094 | ||
1095 | /* Quiescent wait after starting trace */ | |
1096 | ustctl_wait_quiescent(app->key.sock); | |
1097 | ||
1098 | DBG2("UST trace started for app pid %d", app->key.pid); | |
1099 | } | |
1100 | ||
487cf67c DG |
1101 | error: |
1102 | rcu_read_unlock(); | |
1103 | return; | |
1104 | } |