6c9d40f421ff1c0fabbe93c8b5676c85000f3f0d
[lttng-tools.git] / lttng-sessiond / ust-app.c
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
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
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>
24 #include <string.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28
29 #include <urcu/compiler.h>
30 #include <lttngerr.h>
31 #include <lttng-share.h>
32
33 #include "hashtable.h"
34 #include "ust-app.h"
35 #include "ust-consumer.h"
36 #include "ust-ctl.h"
37
38 /*
39 * Delete ust app event safely. RCU read lock must be held before calling
40 * this function.
41 */
42 static void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
43 {
44 /* TODO : remove context */
45 //struct ust_app_ctx *ltctx;
46 //cds_lfht_for_each_entry(lte->ctx, &iter, ltctx, node) {
47 // delete_ust_app_ctx(sock, ltctx);
48 //}
49
50 ustctl_release_object(sock, ua_event->obj);
51 free(ua_event->obj);
52 free(ua_event);
53 }
54
55 /*
56 * Delete ust app stream safely. RCU read lock must be held before calling
57 * this function.
58 */
59 static void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
60 {
61 ustctl_release_object(sock, stream->obj);
62 free(stream->obj);
63 free(stream);
64 }
65
66 /*
67 * Delete ust app channel safely. RCU read lock must be held before calling
68 * this function.
69 */
70 static void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
71 {
72 int ret;
73 struct cds_lfht_iter iter;
74 struct ust_app_event *ua_event;
75 struct ltt_ust_stream *stream, *stmp;
76
77 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
78 cds_list_del(&stream->list);
79 delete_ust_app_stream(sock, stream);
80 }
81
82 /* TODO : remove channel context */
83 //cds_lfht_for_each_entry(ltc->ctx, &iter, ltctx, node) {
84 // hashtable_del(ltc->ctx, &iter);
85 // delete_ust_app_ctx(sock, ltctx);
86 //}
87 //ret = hashtable_destroy(ltc->ctx);
88
89 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
90 hashtable_del(ua_chan->events, &iter);
91 delete_ust_app_event(sock, ua_event);
92 }
93
94 ret = hashtable_destroy(ua_chan->events);
95 if (ret < 0) {
96 ERR("UST app destroy session hashtable failed");
97 goto error;
98 }
99 ustctl_release_object(sock, ua_chan->obj);
100 free(ua_chan->obj);
101 free(ua_chan);
102
103 error:
104 return;
105 }
106
107 /*
108 * Delete ust app session safely. RCU read lock must be held before calling
109 * this function.
110 */
111 static void delete_ust_app_session(int sock,
112 struct ust_app_session *ua_sess)
113 {
114 int ret;
115 struct cds_lfht_iter iter;
116 struct ust_app_channel *ua_chan;
117
118 if (ua_sess->metadata) {
119 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
120 free(ua_sess->metadata->stream_obj);
121 ustctl_release_object(sock, ua_sess->metadata->obj);
122 free(ua_sess->metadata->obj);
123 }
124
125 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
126 hashtable_del(ua_sess->channels, &iter);
127 delete_ust_app_channel(sock, ua_chan);
128 }
129
130 ret = hashtable_destroy(ua_sess->channels);
131 if (ret < 0) {
132 ERR("UST app destroy session hashtable failed");
133 goto error;
134 }
135
136 error:
137 return;
138 }
139
140 /*
141 * Delete a traceable application structure from the global list. Never call
142 * this function outside of a call_rcu call.
143 */
144 static void delete_ust_app(struct ust_app *app)
145 {
146 int ret;
147 struct cds_lfht_node *node;
148 struct cds_lfht_iter iter;
149 struct ust_app_session *ua_sess;
150 int sock;
151
152 rcu_read_lock();
153
154 /* Remove from key hash table */
155 node = hashtable_lookup(ust_app_sock_key_map,
156 (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter);
157 if (node == NULL) {
158 /* Not suppose to happen */
159 ERR("UST app key %d not found in key hash table", app->key.sock);
160 goto end;
161 }
162
163 ret = hashtable_del(ust_app_sock_key_map, &iter);
164 if (ret) {
165 ERR("UST app unable to delete app sock %d from key hash table",
166 app->key.sock);
167 } else {
168 DBG2("UST app pair sock %d key %d deleted",
169 app->key.sock, app->key.pid);
170 }
171
172 /* Socket is already closed at this point */
173
174 /* Delete ust app sessions info */
175 sock = app->key.sock;
176 app->key.sock = -1;
177
178 cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
179 hashtable_del(app->sessions, &iter);
180 delete_ust_app_session(app->key.sock, ua_sess);
181 }
182
183 ret = hashtable_destroy(app->sessions);
184 if (ret < 0) {
185 ERR("UST app destroy session hashtable failed");
186 goto end;
187 }
188
189 /*
190 * Wait until we have removed the key from the sock hash table
191 * before closing this socket, otherwise an application could
192 * re-use the socket ID and race with the teardown, using the
193 * same hash table entry.
194 */
195 close(sock);
196
197 DBG2("UST app pid %d deleted", app->key.pid);
198 free(app);
199 end:
200 rcu_read_unlock();
201 }
202
203 /*
204 * URCU intermediate call to delete an UST app.
205 */
206 static void delete_ust_app_rcu(struct rcu_head *head)
207 {
208 struct cds_lfht_node *node =
209 caa_container_of(head, struct cds_lfht_node, head);
210 struct ust_app *app =
211 caa_container_of(node, struct ust_app, node);
212
213 delete_ust_app(app);
214 }
215
216 /*
217 * Find an ust_app using the sock and return it. RCU read side lock must be
218 * held before calling this helper function.
219 */
220 static struct ust_app *find_app_by_sock(int sock)
221 {
222 struct cds_lfht_node *node;
223 struct ust_app_key *key;
224 struct cds_lfht_iter iter;
225
226 node = hashtable_lookup(ust_app_sock_key_map,
227 (void *)((unsigned long) sock), sizeof(void *), &iter);
228 if (node == NULL) {
229 DBG2("UST app find by sock %d key not found", sock);
230 goto error;
231 }
232
233 key = caa_container_of(node, struct ust_app_key, node);
234
235 node = hashtable_lookup(ust_app_ht,
236 (void *)((unsigned long) key->pid), sizeof(void *), &iter);
237 if (node == NULL) {
238 DBG2("UST app find by sock %d not found", sock);
239 goto error;
240 }
241 return caa_container_of(node, struct ust_app, node);
242
243 error:
244 return NULL;
245 }
246
247 /*
248 * Open metadata onto the UST tracer for a UST session.
249 */
250 static int open_ust_metadata(struct ust_app *app,
251 struct ust_app_session *ua_sess)
252 {
253 int ret;
254 struct lttng_ust_channel_attr uattr;
255
256 uattr.overwrite = ua_sess->metadata->attr.overwrite;
257 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
258 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
259 uattr.switch_timer_interval =
260 ua_sess->metadata->attr.switch_timer_interval;
261 uattr.read_timer_interval =
262 ua_sess->metadata->attr.read_timer_interval;
263 uattr.output = ua_sess->metadata->attr.output;
264
265 /* UST tracer metadata creation */
266 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
267 &ua_sess->metadata->obj);
268 if (ret < 0) {
269 ERR("UST app open metadata failed for app pid:%d",
270 app->key.pid);
271 goto error;
272 }
273
274 error:
275 return ret;
276 }
277
278 /*
279 * Create stream onto the UST tracer for a UST session.
280 */
281 static int create_ust_stream(struct ust_app *app,
282 struct ust_app_session *ua_sess)
283 {
284 int ret;
285
286 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
287 &ua_sess->metadata->stream_obj);
288 if (ret < 0) {
289 ERR("UST create metadata stream failed");
290 goto error;
291 }
292
293 error:
294 return ret;
295 }
296
297 /*
298 * Create the specified channel onto the UST tracer for a UST session.
299 */
300 static int create_ust_channel(struct ust_app *app,
301 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
302 {
303 int ret;
304
305 /* TODO: remove cast and use lttng-ust-abi.h */
306 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
307 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
308 if (ret < 0) {
309 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
310 "and session handle %d with ret %d",
311 ua_chan->name, app->key.pid, app->key.sock,
312 ua_sess->handle, ret);
313 goto error;
314 }
315
316 ua_chan->handle = ua_chan->obj->handle;
317 ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
318 ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
319 ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
320
321 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
322 ua_chan->name, app->key.pid, app->key.sock);
323
324 error:
325 return ret;
326 }
327
328 /*
329 * Create the specified event onto the UST tracer for a UST session.
330 */
331 static int create_ust_event(struct ust_app *app,
332 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
333 struct ust_app_event *ua_event)
334 {
335 int ret = 0;
336
337 /* Create UST event on tracer */
338 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
339 &ua_event->obj);
340 if (ret < 0) {
341 ERR("Error ustctl create event %s for app pid: %d with ret %d",
342 ua_event->attr.name, app->key.pid, ret);
343 goto error;
344 }
345
346 ua_event->handle = ua_event->obj->handle;
347 ua_event->enabled = 1;
348
349 DBG2("UST app event %s created successfully for pid:%d",
350 ua_event->attr.name, app->key.pid);
351
352 error:
353 return ret;
354 }
355
356 /*
357 * Alloc new UST app session.
358 */
359 static struct ust_app_session *alloc_ust_app_session(void)
360 {
361 struct ust_app_session *ua_sess;
362
363 /* Init most of the default value by allocating and zeroing */
364 ua_sess = zmalloc(sizeof(struct ust_app_session));
365 if (ua_sess == NULL) {
366 PERROR("malloc");
367 goto error;
368 }
369
370 ua_sess->handle = -1;
371 ua_sess->channels = hashtable_new_str(0);
372
373 return ua_sess;
374
375 error:
376 return NULL;
377 }
378
379 /*
380 * Alloc new UST app channel.
381 */
382 static struct ust_app_channel *alloc_ust_app_channel(char *name,
383 struct lttng_ust_channel *attr)
384 {
385 struct ust_app_channel *ua_chan;
386
387 /* Init most of the default value by allocating and zeroing */
388 ua_chan = zmalloc(sizeof(struct ust_app_channel));
389 if (ua_chan == NULL) {
390 PERROR("malloc");
391 goto error;
392 }
393
394 /* Setup channel name */
395 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
396 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
397
398 ua_chan->handle = -1;
399 ua_chan->ctx = hashtable_new(0);
400 ua_chan->events = hashtable_new_str(0);
401 hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
402 strlen(ua_chan->name));
403
404 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
405
406 /* Copy attributes */
407 if (attr) {
408 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
409 }
410
411 DBG3("UST app channel %s allocated", ua_chan->name);
412
413 return ua_chan;
414
415 error:
416 return NULL;
417 }
418
419 /*
420 * Alloc new UST app event.
421 */
422 static struct ust_app_event *alloc_ust_app_event(char *name,
423 struct lttng_ust_event *attr)
424 {
425 struct ust_app_event *ua_event;
426
427 /* Init most of the default value by allocating and zeroing */
428 ua_event = zmalloc(sizeof(struct ust_app_event));
429 if (ua_event == NULL) {
430 PERROR("malloc");
431 goto error;
432 }
433
434 strncpy(ua_event->name, name, sizeof(ua_event->name));
435 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
436 ua_event->ctx = hashtable_new(0);
437 hashtable_node_init(&ua_event->node, (void *) ua_event->name,
438 strlen(ua_event->name));
439
440 /* Copy attributes */
441 if (attr) {
442 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
443 }
444
445 DBG3("UST app event %s allocated", ua_event->name);
446
447 return ua_event;
448
449 error:
450 return NULL;
451 }
452
453 /*
454 * Copy data between an UST app event and a LTT event.
455 */
456 static void shadow_copy_event(struct ust_app_event *ua_event,
457 struct ltt_ust_event *uevent)
458 {
459 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
460 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
461
462 /* Copy event attributes */
463 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
464
465 /* TODO: support copy context */
466 }
467
468 /*
469 * Copy data between an UST app channel and a LTT channel.
470 */
471 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
472 struct ltt_ust_channel *uchan)
473 {
474 struct cds_lfht_iter iter;
475 struct cds_lfht_node *ua_event_node;
476 struct ltt_ust_event *uevent;
477 struct ust_app_event *ua_event;
478
479 DBG2("Shadow copy of UST app channel %s", ua_chan->name);
480
481 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
482 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
483 /* Copy event attributes */
484 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
485
486 /* TODO: support copy context */
487
488 /* Copy all events from ltt ust channel to ust app channel */
489 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
490 struct cds_lfht_iter uiter;
491
492 ua_event_node = hashtable_lookup(ua_chan->events,
493 (void *) uevent->attr.name, strlen(uevent->attr.name),
494 &uiter);
495 if (ua_event_node == NULL) {
496 DBG2("UST event %s not found on shadow copy channel",
497 uevent->attr.name);
498 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
499 if (ua_event == NULL) {
500 continue;
501 }
502 shadow_copy_event(ua_event, uevent);
503 hashtable_add_unique(ua_chan->events, &ua_event->node);
504 }
505 }
506
507 DBG3("Shadow copy channel done");
508 }
509
510 /*
511 * Copy data between a UST app session and a regular LTT session.
512 */
513 static void shadow_copy_session(struct ust_app_session *ua_sess,
514 struct ltt_ust_session *usess,
515 struct ust_app *app)
516 {
517 struct cds_lfht_node *ua_chan_node;
518 struct cds_lfht_iter iter;
519 struct ltt_ust_channel *uchan;
520 struct ust_app_channel *ua_chan;
521 time_t rawtime;
522 struct tm *timeinfo;
523 char datetime[16];
524 int ret;
525
526 /* Get date and time for unique app path */
527 time(&rawtime);
528 timeinfo = localtime(&rawtime);
529 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
530
531 DBG2("Shadow copy of session handle %d", ua_sess->handle);
532
533 ua_sess->uid = usess->uid;
534
535 ret = snprintf(ua_sess->path, PATH_MAX,
536 "%s/%s-%d-%s",
537 usess->pathname, app->name, app->key.pid,
538 datetime);
539 if (ret < 0) {
540 PERROR("asprintf UST shadow copy session");
541 /* TODO: We cannot return an error from here.. */
542 assert(0);
543 }
544
545 /* TODO: support all UST domain */
546
547 /* Iterate over all channels in global domain. */
548 cds_lfht_for_each_entry(usess->domain_global.channels, &iter,
549 uchan, node) {
550 struct cds_lfht_iter uiter;
551
552 ua_chan_node = hashtable_lookup(ua_sess->channels,
553 (void *)uchan->name, strlen(uchan->name),
554 &uiter);
555 if (ua_chan_node != NULL) {
556 continue;
557 }
558
559 DBG2("Channel %s not found on shadow session copy, creating it",
560 uchan->name);
561 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
562 if (ua_chan == NULL) {
563 /* malloc failed... continuing */
564 continue;
565 }
566
567 shadow_copy_channel(ua_chan, uchan);
568 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
569 }
570 }
571
572 static
573 void __lookup_session_by_app(struct ltt_ust_session *usess,
574 struct ust_app *app, struct cds_lfht_iter *iter)
575 {
576 /* Get right UST app session from app */
577 (void) hashtable_lookup(app->sessions,
578 (void *) ((unsigned long) usess->uid), sizeof(void *),
579 iter);
580 }
581
582 /*
583 * Return ust app session from the app session hashtable using the UST session
584 * uid.
585 */
586 static struct ust_app_session *lookup_session_by_app(
587 struct ltt_ust_session *usess, struct ust_app *app)
588 {
589 struct cds_lfht_iter iter;
590 struct cds_lfht_node *node;
591
592 __lookup_session_by_app(usess, app, &iter);
593 node = hashtable_iter_get_node(&iter);
594 if (node == NULL) {
595 goto error;
596 }
597
598 return caa_container_of(node, struct ust_app_session, node);
599
600 error:
601 return NULL;
602 }
603
604 /*
605 * Create a UST session onto the tracer of app and add it the session
606 * hashtable.
607 *
608 * Return ust app session or NULL on error.
609 */
610 static struct ust_app_session *create_ust_app_session(
611 struct ltt_ust_session *usess, struct ust_app *app)
612 {
613 int ret;
614 struct ust_app_session *ua_sess;
615
616 ua_sess = lookup_session_by_app(usess, app);
617 if (ua_sess == NULL) {
618 DBG2("UST app pid: %d session uid %d not found, creating it",
619 app->key.pid, usess->uid);
620 ua_sess = alloc_ust_app_session();
621 if (ua_sess == NULL) {
622 /* Only malloc can failed so something is really wrong */
623 goto error;
624 }
625 shadow_copy_session(ua_sess, usess, app);
626 }
627
628 if (ua_sess->handle == -1) {
629 ret = ustctl_create_session(app->key.sock);
630 if (ret < 0) {
631 ERR("Error creating session for app pid %d, sock %d",
632 app->key.pid, app->key.sock);
633 /* TODO: free() ua_sess */
634 goto error;
635 }
636
637 DBG2("UST app ustctl create session handle %d", ret);
638 ua_sess->handle = ret;
639
640 /* Add ust app session to app's HT */
641 hashtable_node_init(&ua_sess->node,
642 (void *)((unsigned long) ua_sess->uid), sizeof(void *));
643 hashtable_add_unique(app->sessions, &ua_sess->node);
644
645 DBG2("UST app session created successfully with handle %d", ret);
646 }
647
648 return ua_sess;
649
650 error:
651 return NULL;
652 }
653
654 /*
655 * Create UST app channel and create it on the tracer.
656 */
657 static struct ust_app_channel *create_ust_app_channel(
658 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
659 struct ust_app *app)
660 {
661 int ret = 0;
662 struct cds_lfht_iter iter;
663 struct cds_lfht_node *ua_chan_node;
664 struct ust_app_channel *ua_chan;
665
666 /* Lookup channel in the ust app session */
667 ua_chan_node = hashtable_lookup(ua_sess->channels,
668 (void *)uchan->name, strlen(uchan->name), &iter);
669 if (ua_chan_node == NULL) {
670 DBG2("Unable to find channel %s in ust session uid %u",
671 uchan->name, ua_sess->uid);
672 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
673 if (ua_chan == NULL) {
674 goto error;
675 }
676 shadow_copy_channel(ua_chan, uchan);
677
678 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
679 } else {
680 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
681 }
682
683 ret = create_ust_channel(app, ua_sess, ua_chan);
684 if (ret < 0) {
685 goto error;
686 }
687
688 return ua_chan;
689
690 error:
691 return NULL;
692 }
693
694 /*
695 * Create UST app event and create it on the tracer side.
696 */
697 static struct ust_app_event *create_ust_app_event(
698 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan,
699 struct ltt_ust_event *uevent, struct ust_app *app)
700 {
701 int ret;
702 struct cds_lfht_iter iter;
703 struct cds_lfht_node *ua_event_node;
704 struct ust_app_event *ua_event;
705
706 /* Get event node */
707 ua_event_node = hashtable_lookup(ua_chan->events,
708 (void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
709 if (ua_event_node == NULL) {
710 DBG2("UST app event %s not found, creating it", uevent->attr.name);
711 /* Does not exist so create one */
712 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
713 if (ua_event == NULL) {
714 /* Only malloc can failed so something is really wrong */
715 goto error;
716 }
717 shadow_copy_event(ua_event, uevent);
718
719 hashtable_add_unique(ua_chan->events, &ua_event->node);
720 } else {
721 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
722 }
723
724 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
725 if (ret < 0) {
726 goto error;
727 }
728
729 return ua_event;
730
731 error:
732 return NULL;
733 }
734
735 /*
736 * Create UST metadata and open it on the tracer side.
737 */
738 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
739 char *pathname, struct ust_app *app)
740 {
741 int ret = 0;
742
743 if (ua_sess->metadata == NULL) {
744 /* Allocate UST metadata */
745 ua_sess->metadata = trace_ust_create_metadata(pathname);
746 if (ua_sess->metadata == NULL) {
747 ERR("UST app session %d creating metadata failed",
748 ua_sess->handle);
749 goto error;
750 }
751
752 ret = open_ust_metadata(app, ua_sess);
753 if (ret < 0) {
754 goto error;
755 }
756
757 DBG2("UST metadata opened for app pid %d", app->key.pid);
758 }
759
760 /* Open UST metadata stream */
761 if (ua_sess->metadata->stream_obj == NULL) {
762 ret = create_ust_stream(app, ua_sess);
763 if (ret < 0) {
764 goto error;
765 }
766
767 ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG);
768 if (ret < 0) {
769 PERROR("mkdir UST metadata");
770 goto error;
771 }
772
773 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
774 "%s/metadata", ua_sess->path);
775 if (ret < 0) {
776 PERROR("asprintf UST create stream");
777 goto error;
778 }
779
780 DBG2("UST metadata stream object created for app pid %d",
781 app->key.pid);
782 } else {
783 ERR("Attempting to create stream without metadata opened");
784 goto error;
785 }
786
787 return 0;
788
789 error:
790 return -1;
791 }
792
793 /*
794 * Return pointer to traceable apps list.
795 */
796 struct cds_lfht *ust_app_get_ht(void)
797 {
798 return ust_app_ht;
799 }
800
801 /*
802 * Return ust app pointer or NULL if not found.
803 */
804 struct ust_app *ust_app_find_by_pid(pid_t pid)
805 {
806 struct cds_lfht_node *node;
807 struct cds_lfht_iter iter;
808
809 rcu_read_lock();
810 node = hashtable_lookup(ust_app_ht,
811 (void *)((unsigned long) pid), sizeof(void *), &iter);
812 if (node == NULL) {
813 DBG2("UST app no found with pid %d", pid);
814 goto error;
815 }
816 rcu_read_unlock();
817
818 DBG2("Found UST app by pid %d", pid);
819
820 return caa_container_of(node, struct ust_app, node);
821
822 error:
823 rcu_read_unlock();
824 return NULL;
825 }
826
827 /*
828 * Using pid and uid (of the app), allocate a new ust_app struct and
829 * add it to the global traceable app list.
830 *
831 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
832 * bitness is not supported.
833 */
834 int ust_app_register(struct ust_register_msg *msg, int sock)
835 {
836 struct ust_app *lta;
837
838 /*
839 * Currently support only tracing of application which share the
840 * same bitness as the consumer. Eventually implement dispatch
841 * to specific compat32 consumer.
842 */
843 if (msg->bits_per_long != CAA_BITS_PER_LONG) {
844 ERR("Registration failed: application \"%s\" (pid: %d) has "
845 "%d-bit long, but only "
846 "%d-bit lttng-consumerd is available.\n",
847 msg->name, msg->pid, msg->bits_per_long,
848 CAA_BITS_PER_LONG);
849 return -EINVAL;
850 }
851
852 lta = zmalloc(sizeof(struct ust_app));
853 if (lta == NULL) {
854 PERROR("malloc");
855 return -ENOMEM;
856 }
857
858 lta->ppid = msg->ppid;
859 lta->uid = msg->uid;
860 lta->gid = msg->gid;
861 lta->v_major = msg->major;
862 lta->v_minor = msg->minor;
863 strncpy(lta->name, msg->name, sizeof(lta->name));
864 lta->name[16] = '\0';
865 lta->sessions = hashtable_new(0);
866
867 /* Set key map */
868 lta->key.pid = msg->pid;
869 hashtable_node_init(&lta->node, (void *)((unsigned long)lta->key.pid),
870 sizeof(void *));
871 lta->key.sock = sock;
872 hashtable_node_init(&lta->key.node, (void *)((unsigned long)lta->key.sock),
873 sizeof(void *));
874
875 rcu_read_lock();
876 hashtable_add_unique(ust_app_sock_key_map, &lta->key.node);
877 hashtable_add_unique(ust_app_ht, &lta->node);
878 rcu_read_unlock();
879
880 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
881 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
882 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
883
884 return 0;
885 }
886
887 /*
888 * Unregister app by removing it from the global traceable app list and freeing
889 * the data struct.
890 *
891 * The socket is already closed at this point so no close to sock.
892 */
893 void ust_app_unregister(int sock)
894 {
895 struct ust_app *lta;
896 struct cds_lfht_node *node;
897 struct cds_lfht_iter iter;
898
899 rcu_read_lock();
900 lta = find_app_by_sock(sock);
901 if (lta == NULL) {
902 ERR("Unregister app sock %d not found!", sock);
903 goto error;
904 }
905
906 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
907
908 /* Get the node reference for a call_rcu */
909 node = hashtable_lookup(ust_app_ht,
910 (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter);
911 if (node == NULL) {
912 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
913 goto error;
914 }
915
916 hashtable_del(ust_app_ht, &iter);
917 call_rcu(&node->head, delete_ust_app_rcu);
918 error:
919 rcu_read_unlock();
920 return;
921 }
922
923 /*
924 * Return traceable_app_count
925 */
926 unsigned long ust_app_list_count(void)
927 {
928 unsigned long count;
929
930 rcu_read_lock();
931 count = hashtable_get_count(ust_app_ht);
932 rcu_read_unlock();
933
934 return count;
935 }
936
937 /*
938 * Fill events array with all events name of all registered apps.
939 */
940 int ust_app_list_events(struct lttng_event **events)
941 {
942 int ret, handle;
943 size_t nbmem, count = 0;
944 struct cds_lfht_iter iter;
945 struct ust_app *app;
946 struct lttng_event *tmp;
947
948 nbmem = UST_APP_EVENT_LIST_SIZE;
949 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
950 if (tmp == NULL) {
951 PERROR("zmalloc ust app events");
952 ret = -ENOMEM;
953 goto error;
954 }
955
956 rcu_read_lock();
957
958 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
959 handle = ustctl_tracepoint_list(app->key.sock);
960 if (handle < 0) {
961 ERR("UST app list events getting handle failed for app pid %d",
962 app->key.pid);
963 continue;
964 }
965
966 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
967 tmp[count].name)) != -ENOENT) {
968 if (count > nbmem) {
969 DBG2("Reallocating event list from %zu to %zu bytes", nbmem,
970 nbmem + UST_APP_EVENT_LIST_SIZE);
971 nbmem += UST_APP_EVENT_LIST_SIZE;
972 tmp = realloc(tmp, nbmem);
973 if (tmp == NULL) {
974 PERROR("realloc ust app events");
975 ret = -ENOMEM;
976 goto rcu_error;
977 }
978 }
979
980 tmp[count].type = LTTNG_UST_TRACEPOINT;
981 tmp[count].pid = app->key.pid;
982 tmp[count].enabled = -1;
983 count++;
984 }
985 }
986
987 ret = count;
988 *events = tmp;
989
990 DBG2("UST app list events done (%zu events)", count);
991
992 rcu_error:
993 rcu_read_unlock();
994 error:
995 return ret;
996 }
997
998 /*
999 * Free and clean all traceable apps of the global list.
1000 */
1001 void ust_app_clean_list(void)
1002 {
1003 int ret;
1004 struct cds_lfht_node *node;
1005 struct cds_lfht_iter iter;
1006 struct ust_app *app;
1007
1008 DBG2("UST app cleaning registered apps hash table");
1009
1010 rcu_read_lock();
1011
1012 cds_lfht_for_each(ust_app_ht, &iter, node) {
1013 app = caa_container_of(node, struct ust_app, node);
1014
1015 ret = hashtable_del(ust_app_ht, &iter);
1016 if (!ret) {
1017 call_rcu(&node->head, delete_ust_app_rcu);
1018 }
1019 }
1020
1021 hashtable_destroy(ust_app_ht);
1022 hashtable_destroy(ust_app_sock_key_map);
1023
1024 rcu_read_unlock();
1025 }
1026
1027 /*
1028 * Init UST app hash table.
1029 */
1030 void ust_app_ht_alloc(void)
1031 {
1032 ust_app_ht = hashtable_new(0);
1033 ust_app_sock_key_map = hashtable_new(0);
1034 }
1035
1036 /*
1037 * For a specific UST session, create the channel for all registered apps.
1038 */
1039 int ust_app_create_channel_all(struct ltt_ust_session *usess,
1040 struct ltt_ust_channel *uchan)
1041 {
1042 int ret = 0;
1043 struct cds_lfht_iter iter;
1044 struct ust_app *app;
1045 struct ust_app_session *ua_sess;
1046 struct ust_app_channel *ua_chan;
1047
1048 if (usess == NULL || uchan == NULL) {
1049 ERR("Adding UST global channel to NULL values");
1050 ret = -1;
1051 goto error;
1052 }
1053
1054 DBG2("UST app adding channel %s to global domain for session uid %d",
1055 uchan->name, usess->uid);
1056
1057 rcu_read_lock();
1058
1059 /* For every registered applications */
1060 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1061 /* Create session on the tracer side and add it to app session HT */
1062 ua_sess = create_ust_app_session(usess, app);
1063 if (ua_sess == NULL) {
1064 continue;
1065 }
1066
1067 /* Create channel onto application */
1068 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1069 if (ua_chan == NULL) {
1070 continue;
1071 }
1072 }
1073
1074 rcu_read_unlock();
1075
1076 error:
1077 return ret;
1078 }
1079
1080 /*
1081 * For a specific UST session and UST channel, create the event for all
1082 * registered apps.
1083 */
1084 int ust_app_create_event_all(struct ltt_ust_session *usess,
1085 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1086 {
1087 int ret = 0;
1088 struct cds_lfht_iter iter;
1089 struct cds_lfht_node *ua_chan_node;
1090 struct ust_app *app;
1091 struct ust_app_session *ua_sess;
1092 struct ust_app_channel *ua_chan;
1093 struct ust_app_event *ua_event;
1094
1095 DBG("UST app creating event %s for all apps for session uid %d",
1096 uevent->attr.name, usess->uid);
1097
1098 rcu_read_lock();
1099
1100 /* For all registered applications */
1101 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1102 struct cds_lfht_iter uiter;
1103
1104 /* Create session on the tracer side and add it to app session HT */
1105 ua_sess = create_ust_app_session(usess, app);
1106 if (ua_sess == NULL) {
1107 continue;
1108 }
1109
1110 /* Lookup channel in the ust app session */
1111 ua_chan_node = hashtable_lookup(ua_sess->channels,
1112 (void *)uchan->name, strlen(uchan->name),
1113 &uiter);
1114 if (ua_chan_node == NULL) {
1115 ERR("Channel %s not found in session uid %d. Skipping",
1116 uchan->name, usess->uid);
1117 continue;
1118 }
1119 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1120
1121 ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1122 if (ua_event == NULL) {
1123 continue;
1124 }
1125 }
1126
1127 rcu_read_unlock();
1128
1129 return ret;
1130 }
1131
1132 /*
1133 * Start tracing for a specific UST session and app.
1134 */
1135 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1136 {
1137 int ret = 0;
1138 struct cds_lfht_iter iter;
1139 struct ust_app_session *ua_sess;
1140 struct ust_app_channel *ua_chan;
1141 struct ltt_ust_stream *ustream;
1142
1143 DBG("Starting tracing for ust app pid %d", app->key.pid);
1144
1145 rcu_read_lock();
1146
1147 ua_sess = lookup_session_by_app(usess, app);
1148 if (ua_sess == NULL) {
1149 /* Only malloc can failed so something is really wrong */
1150 goto error_rcu_unlock;
1151 }
1152
1153 /* upon restart, we skip the setup, already done */
1154 if (ua_sess->started)
1155 goto skip_setup;
1156
1157 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1158 if (ret < 0) {
1159 goto error_rcu_unlock;
1160 }
1161
1162 /* For each channel */
1163 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
1164 /* Create all streams */
1165 while (1) {
1166 /* Create UST stream */
1167 ustream = zmalloc(sizeof(*ustream));
1168 if (ustream == NULL) {
1169 PERROR("zmalloc ust stream");
1170 goto error_rcu_unlock;
1171 }
1172
1173 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1174 &ustream->obj);
1175 if (ret < 0) {
1176 /* Got all streams */
1177 break;
1178 }
1179 ustream->handle = ustream->obj->handle;
1180
1181 /* Order is important */
1182 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1183 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1184 ua_sess->path, ua_chan->name,
1185 ua_chan->streams.count++);
1186 if (ret < 0) {
1187 PERROR("asprintf UST create stream");
1188 continue;
1189 }
1190 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1191 ustream->pathname);
1192 }
1193 }
1194
1195 /* Setup UST consumer socket and send fds to it */
1196 ret = ust_consumer_send_session(ust_consumer_fd, ua_sess);
1197 if (ret < 0) {
1198 goto error_rcu_unlock;
1199 }
1200 ua_sess->started = 1;
1201
1202 skip_setup:
1203 /* This start the UST tracing */
1204 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1205 if (ret < 0) {
1206 ERR("Error starting tracing for app pid: %d", app->key.pid);
1207 goto error_rcu_unlock;
1208 }
1209
1210 rcu_read_unlock();
1211
1212 /* Quiescent wait after starting trace */
1213 ustctl_wait_quiescent(app->key.sock);
1214
1215 return 0;
1216
1217 error_rcu_unlock:
1218 rcu_read_unlock();
1219 return -1;
1220 }
1221
1222 /*
1223 * Stop tracing for a specific UST session and app.
1224 */
1225 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1226 {
1227 int ret = 0;
1228 struct ust_app_session *ua_sess;
1229
1230 DBG("Stopping tracing for ust app pid %d", app->key.pid);
1231
1232 rcu_read_lock();
1233
1234 ua_sess = lookup_session_by_app(usess, app);
1235 if (ua_sess == NULL) {
1236 /* Only malloc can failed so something is really wrong */
1237 goto error_rcu_unlock;
1238 }
1239
1240 #if 0 /* only useful when periodical flush will be supported */
1241 /* need to keep a handle on shm in session for this. */
1242 /* Flush all buffers before stopping */
1243 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
1244 if (ret < 0) {
1245 ERR("UST metadata flush failed");
1246 }
1247
1248 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
1249 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
1250 if (ret < 0) {
1251 ERR("UST flush buffer error");
1252 }
1253 }
1254 #endif
1255
1256 /* This inhibits UST tracing */
1257 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1258 if (ret < 0) {
1259 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1260 goto error_rcu_unlock;
1261 }
1262
1263 rcu_read_unlock();
1264
1265 /* Quiescent wait after stopping trace */
1266 ustctl_wait_quiescent(app->key.sock);
1267
1268 return 0;
1269
1270 error_rcu_unlock:
1271 rcu_read_unlock();
1272 return -1;
1273 }
1274
1275 /*
1276 * Destroy a specific UST session in apps.
1277 */
1278 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
1279 {
1280 struct ust_app_session *ua_sess;
1281 struct lttng_ust_object_data obj;
1282 struct cds_lfht_iter iter;
1283 struct cds_lfht_node *node;
1284
1285 DBG("Destroy tracing for ust app pid %d", app->key.pid);
1286
1287 rcu_read_lock();
1288
1289 __lookup_session_by_app(usess, app, &iter);
1290 node = hashtable_iter_get_node(&iter);
1291 if (node == NULL) {
1292 /* Only malloc can failed so something is really wrong */
1293 goto error_rcu_unlock;
1294 }
1295 ua_sess = caa_container_of(node, struct ust_app_session, node);
1296 hashtable_del(app->sessions, &iter);
1297 delete_ust_app_session(app->key.sock, ua_sess);
1298 obj.handle = ua_sess->handle;
1299 obj.shm_fd = -1;
1300 obj.wait_fd = -1;
1301 obj.memory_map_size = 0;
1302 ustctl_release_object(app->key.sock, &obj);
1303
1304 rcu_read_unlock();
1305
1306 /* Quiescent wait after stopping trace */
1307 ustctl_wait_quiescent(app->key.sock);
1308
1309 return 0;
1310
1311 error_rcu_unlock:
1312 rcu_read_unlock();
1313 return -1;
1314 }
1315
1316 /*
1317 * Start tracing for the UST session.
1318 */
1319 int ust_app_start_trace_all(struct ltt_ust_session *usess)
1320 {
1321 int ret = 0;
1322 struct cds_lfht_iter iter;
1323 struct ust_app *app;
1324
1325 DBG("Starting all UST traces");
1326
1327 rcu_read_lock();
1328
1329 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1330 ret = ust_app_start_trace(usess, app);
1331 if (ret < 0) {
1332 /* Continue to next apps even on error */
1333 continue;
1334 }
1335 }
1336
1337 rcu_read_unlock();
1338
1339 return 0;
1340 }
1341
1342 /*
1343 * Start tracing for the UST session.
1344 */
1345 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
1346 {
1347 int ret = 0;
1348 struct cds_lfht_iter iter;
1349 struct ust_app *app;
1350
1351 DBG("Stopping all UST traces");
1352
1353 rcu_read_lock();
1354
1355 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1356 ret = ust_app_stop_trace(usess, app);
1357 if (ret < 0) {
1358 /* Continue to next apps even on error */
1359 continue;
1360 }
1361 }
1362
1363 rcu_read_unlock();
1364
1365 return 0;
1366 }
1367
1368 /*
1369 * Destroy app UST session.
1370 */
1371 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
1372 {
1373 int ret = 0;
1374 struct cds_lfht_iter iter;
1375 struct ust_app *app;
1376
1377 DBG("Destroy all UST traces");
1378
1379 rcu_read_lock();
1380
1381 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1382 ret = ust_app_destroy_trace(usess, app);
1383 if (ret < 0) {
1384 /* Continue to next apps even on error */
1385 continue;
1386 }
1387 }
1388
1389 rcu_read_unlock();
1390
1391 return 0;
1392 }
1393
1394 /*
1395 * Add channels/events from UST global domain to registered apps at sock.
1396 */
1397 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
1398 {
1399 int ret = 0;
1400 struct cds_lfht_iter iter;
1401 struct ust_app *app;
1402 struct ust_app_session *ua_sess;
1403 struct ust_app_channel *ua_chan;
1404 struct ust_app_event *ua_event;
1405
1406 if (usess == NULL) {
1407 ERR("No UST session on global update. Returning");
1408 goto error;
1409 }
1410
1411 DBG2("UST app global update for app sock %d for session uid %d", sock,
1412 usess->uid);
1413
1414 rcu_read_lock();
1415
1416 app = find_app_by_sock(sock);
1417 if (app == NULL) {
1418 ERR("Failed to update app sock %d", sock);
1419 goto error;
1420 }
1421
1422 ua_sess = create_ust_app_session(usess, app);
1423 if (ua_sess == NULL) {
1424 goto error;
1425 }
1426
1427 /*
1428 * We can iterate safely here over all UST app session sicne the create ust
1429 * app session above made a shadow copy of the UST global domain from the
1430 * ltt ust session.
1431 */
1432 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
1433 ret = create_ust_channel(app, ua_sess, ua_chan);
1434 if (ret < 0) {
1435 /* FIXME: Should we quit here or continue... */
1436 continue;
1437 }
1438
1439 /* For each events */
1440 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
1441 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1442 if (ret < 0) {
1443 /* FIXME: Should we quit here or continue... */
1444 continue;
1445 }
1446 }
1447 }
1448
1449 if (usess->start_trace) {
1450 ret = ust_app_start_trace(usess, app);
1451 if (ret < 0) {
1452 goto error;
1453 }
1454
1455 DBG2("UST trace started for app pid %d", app->key.pid);
1456 }
1457
1458 error:
1459 rcu_read_unlock();
1460 return;
1461 }
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