Add missing rcu read lock
[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 context safely. RCU read lock must be held before calling
40 * this function.
41 */
42 static
43 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
44 {
45 if (ua_ctx->obj) {
46 ustctl_release_object(sock, ua_ctx->obj);
47 free(ua_ctx->obj);
48 }
49 free(ua_ctx);
50 }
51
52 /*
53 * Delete ust app event safely. RCU read lock must be held before calling
54 * this function.
55 */
56 static
57 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
58 {
59 int ret;
60 struct cds_lfht_iter iter;
61 struct ust_app_ctx *ua_ctx;
62
63 cds_lfht_for_each_entry(ua_event->ctx, &iter, ua_ctx, node) {
64 ret = hashtable_del(ua_event->ctx, &iter);
65 assert(!ret);
66 delete_ust_app_ctx(sock, ua_ctx);
67 }
68 ret = hashtable_destroy(ua_event->ctx);
69 assert(!ret);
70
71 if (ua_event->obj != NULL) {
72 ustctl_release_object(sock, ua_event->obj);
73 free(ua_event->obj);
74 }
75 free(ua_event);
76 }
77
78 /*
79 * Delete ust app stream safely. RCU read lock must be held before calling
80 * this function.
81 */
82 static
83 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
84 {
85 if (stream->obj) {
86 ustctl_release_object(sock, stream->obj);
87 free(stream->obj);
88 }
89 free(stream);
90 }
91
92 /*
93 * Delete ust app channel safely. RCU read lock must be held before calling
94 * this function.
95 */
96 static
97 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
98 {
99 int ret;
100 struct cds_lfht_iter iter;
101 struct ust_app_event *ua_event;
102 struct ust_app_ctx *ua_ctx;
103 struct ltt_ust_stream *stream, *stmp;
104
105 /* Wipe stream */
106 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
107 cds_list_del(&stream->list);
108 delete_ust_app_stream(sock, stream);
109 }
110
111 /* Wipe context */
112 cds_lfht_for_each_entry(ua_chan->ctx, &iter, ua_ctx, node) {
113 ret = hashtable_del(ua_chan->ctx, &iter);
114 assert(!ret);
115 delete_ust_app_ctx(sock, ua_ctx);
116 }
117 ret = hashtable_destroy(ua_chan->ctx);
118 assert(!ret);
119
120 /* Wipe events */
121 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
122 ret = hashtable_del(ua_chan->events, &iter);
123 assert(!ret);
124 delete_ust_app_event(sock, ua_event);
125 }
126 ret = hashtable_destroy(ua_chan->events);
127 assert(!ret);
128
129 if (ua_chan->obj != NULL) {
130 ustctl_release_object(sock, ua_chan->obj);
131 free(ua_chan->obj);
132 }
133 free(ua_chan);
134 }
135
136 /*
137 * Delete ust app session safely. RCU read lock must be held before calling
138 * this function.
139 */
140 static
141 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
142 {
143 int ret;
144 struct cds_lfht_iter iter;
145 struct ust_app_channel *ua_chan;
146
147 if (ua_sess->metadata) {
148 if (ua_sess->metadata->stream_obj) {
149 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
150 free(ua_sess->metadata->stream_obj);
151 }
152 if (ua_sess->metadata->obj) {
153 ustctl_release_object(sock, ua_sess->metadata->obj);
154 free(ua_sess->metadata->obj);
155 }
156 }
157
158 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
159 ret = hashtable_del(ua_sess->channels, &iter);
160 assert(!ret);
161 delete_ust_app_channel(sock, ua_chan);
162 }
163 ret = hashtable_destroy(ua_sess->channels);
164 assert(!ret);
165
166 free(ua_sess);
167 }
168
169 /*
170 * Delete a traceable application structure from the global list. Never call
171 * this function outside of a call_rcu call.
172 */
173 static
174 void delete_ust_app(struct ust_app *app)
175 {
176 int ret, sock;
177 struct cds_lfht_node *node;
178 struct cds_lfht_iter iter;
179 struct ust_app_session *ua_sess;
180
181 rcu_read_lock();
182
183 /* Remove from key hash table */
184 node = hashtable_lookup(ust_app_sock_key_map,
185 (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter);
186 if (node == NULL) {
187 /* Not suppose to happen */
188 ERR("UST app key %d not found in key hash table", app->key.sock);
189 goto end;
190 }
191
192 ret = hashtable_del(ust_app_sock_key_map, &iter);
193 if (ret) {
194 ERR("UST app unable to delete app sock %d from key hash table",
195 app->key.sock);
196 } else {
197 DBG2("UST app pair sock %d key %d deleted",
198 app->key.sock, app->key.pid);
199 }
200
201 /* Socket is already closed at this point */
202
203 /* Delete ust app sessions info */
204 sock = app->key.sock;
205 app->key.sock = -1;
206
207 /* Wipe sessions */
208 cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
209 ret = hashtable_del(app->sessions, &iter);
210 assert(!ret);
211 delete_ust_app_session(app->key.sock, ua_sess);
212 }
213 ret = hashtable_destroy(app->sessions);
214 assert(!ret);
215
216 /*
217 * Wait until we have removed the key from the sock hash table
218 * before closing this socket, otherwise an application could
219 * re-use the socket ID and race with the teardown, using the
220 * same hash table entry.
221 */
222 close(sock);
223
224 DBG2("UST app pid %d deleted", app->key.pid);
225 free(app);
226 end:
227 rcu_read_unlock();
228 }
229
230 /*
231 * URCU intermediate call to delete an UST app.
232 */
233 static
234 void delete_ust_app_rcu(struct rcu_head *head)
235 {
236 struct cds_lfht_node *node =
237 caa_container_of(head, struct cds_lfht_node, head);
238 struct ust_app *app =
239 caa_container_of(node, struct ust_app, node);
240
241 delete_ust_app(app);
242 }
243
244 /*
245 * Alloc new UST app session.
246 */
247 static
248 struct ust_app_session *alloc_ust_app_session(void)
249 {
250 struct ust_app_session *ua_sess;
251
252 /* Init most of the default value by allocating and zeroing */
253 ua_sess = zmalloc(sizeof(struct ust_app_session));
254 if (ua_sess == NULL) {
255 PERROR("malloc");
256 goto error;
257 }
258
259 ua_sess->handle = -1;
260 ua_sess->channels = hashtable_new_str(0);
261
262 return ua_sess;
263
264 error:
265 return NULL;
266 }
267
268 /*
269 * Alloc new UST app channel.
270 */
271 static
272 struct ust_app_channel *alloc_ust_app_channel(char *name,
273 struct lttng_ust_channel *attr)
274 {
275 struct ust_app_channel *ua_chan;
276
277 /* Init most of the default value by allocating and zeroing */
278 ua_chan = zmalloc(sizeof(struct ust_app_channel));
279 if (ua_chan == NULL) {
280 PERROR("malloc");
281 goto error;
282 }
283
284 /* Setup channel name */
285 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
286 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
287
288 ua_chan->enabled = 1;
289 ua_chan->handle = -1;
290 ua_chan->ctx = hashtable_new(0);
291 ua_chan->events = hashtable_new_str(0);
292 hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
293 strlen(ua_chan->name));
294
295 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
296
297 /* Copy attributes */
298 if (attr) {
299 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
300 }
301
302 DBG3("UST app channel %s allocated", ua_chan->name);
303
304 return ua_chan;
305
306 error:
307 return NULL;
308 }
309
310 /*
311 * Alloc new UST app event.
312 */
313 static
314 struct ust_app_event *alloc_ust_app_event(char *name,
315 struct lttng_ust_event *attr)
316 {
317 struct ust_app_event *ua_event;
318
319 /* Init most of the default value by allocating and zeroing */
320 ua_event = zmalloc(sizeof(struct ust_app_event));
321 if (ua_event == NULL) {
322 PERROR("malloc");
323 goto error;
324 }
325
326 ua_event->enabled = 1;
327 strncpy(ua_event->name, name, sizeof(ua_event->name));
328 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
329 ua_event->ctx = hashtable_new(0);
330 hashtable_node_init(&ua_event->node, (void *) ua_event->name,
331 strlen(ua_event->name));
332
333 /* Copy attributes */
334 if (attr) {
335 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
336 }
337
338 DBG3("UST app event %s allocated", ua_event->name);
339
340 return ua_event;
341
342 error:
343 return NULL;
344 }
345
346 /*
347 * Alloc new UST app context.
348 */
349 static
350 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
351 {
352 struct ust_app_ctx *ua_ctx;
353
354 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
355 if (ua_ctx == NULL) {
356 goto error;
357 }
358
359 if (uctx) {
360 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
361 }
362
363 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
364
365 error:
366 return ua_ctx;
367 }
368
369 /*
370 * Find an ust_app using the sock and return it. RCU read side lock must be
371 * held before calling this helper function.
372 */
373 static
374 struct ust_app *find_app_by_sock(int sock)
375 {
376 struct cds_lfht_node *node;
377 struct ust_app_key *key;
378 struct cds_lfht_iter iter;
379
380 node = hashtable_lookup(ust_app_sock_key_map,
381 (void *)((unsigned long) sock), sizeof(void *), &iter);
382 if (node == NULL) {
383 DBG2("UST app find by sock %d key not found", sock);
384 goto error;
385 }
386
387 key = caa_container_of(node, struct ust_app_key, node);
388
389 node = hashtable_lookup(ust_app_ht,
390 (void *)((unsigned long) key->pid), sizeof(void *), &iter);
391 if (node == NULL) {
392 DBG2("UST app find by sock %d not found", sock);
393 goto error;
394 }
395 return caa_container_of(node, struct ust_app, node);
396
397 error:
398 return NULL;
399 }
400
401 /*
402 * Create the channel context on the tracer.
403 */
404 static
405 int create_ust_channel_context(struct ust_app_channel *ua_chan,
406 struct ust_app_ctx *ua_ctx, struct ust_app *app)
407 {
408 int ret;
409
410 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
411 ua_chan->obj, &ua_ctx->obj);
412 if (ret < 0) {
413 goto error;
414 }
415
416 ua_ctx->handle = ua_ctx->obj->handle;
417
418 DBG2("UST app context added to channel %s successfully", ua_chan->name);
419
420 error:
421 return ret;
422 }
423
424 /*
425 * Create the event context on the tracer.
426 */
427 static
428 int create_ust_event_context(struct ust_app_event *ua_event,
429 struct ust_app_ctx *ua_ctx, struct ust_app *app)
430 {
431 int ret;
432
433 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
434 ua_event->obj, &ua_ctx->obj);
435 if (ret < 0) {
436 goto error;
437 }
438
439 ua_ctx->handle = ua_ctx->obj->handle;
440
441 DBG2("UST app context added to event %s successfully", ua_event->name);
442
443 error:
444 return ret;
445 }
446
447 /*
448 * Disable the specified event on to UST tracer for the UST session.
449 */
450 static int disable_ust_event(struct ust_app *app,
451 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
452 {
453 int ret;
454
455 ret = ustctl_disable(app->key.sock, ua_event->obj);
456 if (ret < 0) {
457 ERR("UST app event %s disable failed for app (pid: %d) "
458 "and session handle %d with ret %d",
459 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
460 goto error;
461 }
462
463 DBG2("UST app event %s disabled successfully for app (pid: %d)",
464 ua_event->attr.name, app->key.pid);
465
466 error:
467 return ret;
468 }
469
470 /*
471 * Disable the specified channel on to UST tracer for the UST session.
472 */
473 static int disable_ust_channel(struct ust_app *app,
474 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
475 {
476 int ret;
477
478 ret = ustctl_disable(app->key.sock, ua_chan->obj);
479 if (ret < 0) {
480 ERR("UST app channel %s disable failed for app (pid: %d) "
481 "and session handle %d with ret %d",
482 ua_chan->name, app->key.pid, ua_sess->handle, ret);
483 goto error;
484 }
485
486 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
487 ua_chan->name, app->key.pid);
488
489 error:
490 return ret;
491 }
492
493 /*
494 * Enable the specified channel on to UST tracer for the UST session.
495 */
496 static int enable_ust_channel(struct ust_app *app,
497 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
498 {
499 int ret;
500
501 ret = ustctl_enable(app->key.sock, ua_chan->obj);
502 if (ret < 0) {
503 ERR("UST app channel %s enable failed for app (pid: %d) "
504 "and session handle %d with ret %d",
505 ua_chan->name, app->key.pid, ua_sess->handle, ret);
506 goto error;
507 }
508
509 ua_chan->enabled = 1;
510
511 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
512 ua_chan->name, app->key.pid);
513
514 error:
515 return ret;
516 }
517
518 /*
519 * Enable the specified event on to UST tracer for the UST session.
520 */
521 static int enable_ust_event(struct ust_app *app,
522 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
523 {
524 int ret;
525
526 ret = ustctl_enable(app->key.sock, ua_event->obj);
527 if (ret < 0) {
528 ERR("UST app event %s enable failed for app (pid: %d) "
529 "and session handle %d with ret %d",
530 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
531 goto error;
532 }
533
534 DBG2("UST app event %s enabled successfully for app (pid: %d)",
535 ua_event->attr.name, app->key.pid);
536
537 error:
538 return ret;
539 }
540
541 /*
542 * Open metadata onto the UST tracer for a UST session.
543 */
544 static int open_ust_metadata(struct ust_app *app,
545 struct ust_app_session *ua_sess)
546 {
547 int ret;
548 struct lttng_ust_channel_attr uattr;
549
550 uattr.overwrite = ua_sess->metadata->attr.overwrite;
551 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
552 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
553 uattr.switch_timer_interval =
554 ua_sess->metadata->attr.switch_timer_interval;
555 uattr.read_timer_interval =
556 ua_sess->metadata->attr.read_timer_interval;
557 uattr.output = ua_sess->metadata->attr.output;
558
559 /* UST tracer metadata creation */
560 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
561 &ua_sess->metadata->obj);
562 if (ret < 0) {
563 ERR("UST app open metadata failed for app pid:%d",
564 app->key.pid);
565 goto error;
566 }
567
568 error:
569 return ret;
570 }
571
572 /*
573 * Create stream onto the UST tracer for a UST session.
574 */
575 static int create_ust_stream(struct ust_app *app,
576 struct ust_app_session *ua_sess)
577 {
578 int ret;
579
580 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
581 &ua_sess->metadata->stream_obj);
582 if (ret < 0) {
583 ERR("UST create metadata stream failed");
584 goto error;
585 }
586
587 error:
588 return ret;
589 }
590
591 /*
592 * Create the specified channel onto the UST tracer for a UST session.
593 */
594 static int create_ust_channel(struct ust_app *app,
595 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
596 {
597 int ret;
598
599 /* TODO: remove cast and use lttng-ust-abi.h */
600 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
601 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
602 if (ret < 0) {
603 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
604 "and session handle %d with ret %d",
605 ua_chan->name, app->key.pid, app->key.sock,
606 ua_sess->handle, ret);
607 goto error;
608 }
609
610 ua_chan->handle = ua_chan->obj->handle;
611 ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
612 ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
613 ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
614
615 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
616 ua_chan->name, app->key.pid, app->key.sock);
617
618 /* If channel is not enabled, disable it on the tracer */
619 if (!ua_chan->enabled) {
620 ret = disable_ust_channel(app, ua_sess, ua_chan);
621 if (ret < 0) {
622 goto error;
623 }
624 }
625
626 error:
627 return ret;
628 }
629
630 /*
631 * Create the specified event onto the UST tracer for a UST session.
632 */
633 static
634 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
635 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
636 {
637 int ret = 0;
638
639 /* Create UST event on tracer */
640 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
641 &ua_event->obj);
642 if (ret < 0) {
643 ERR("Error ustctl create event %s for app pid: %d with ret %d",
644 ua_event->attr.name, app->key.pid, ret);
645 goto error;
646 }
647
648 ua_event->handle = ua_event->obj->handle;
649
650 DBG2("UST app event %s created successfully for pid:%d",
651 ua_event->attr.name, app->key.pid);
652
653 /* If event not enabled, disable it on the tracer */
654 if (!ua_event->enabled) {
655 ret = disable_ust_event(app, ua_sess, ua_event);
656 if (ret < 0) {
657 goto error;
658 }
659 }
660
661 error:
662 return ret;
663 }
664
665 /*
666 * Copy data between an UST app event and a LTT event.
667 */
668 static void shadow_copy_event(struct ust_app_event *ua_event,
669 struct ltt_ust_event *uevent)
670 {
671 struct cds_lfht_iter iter;
672 struct ltt_ust_context *uctx;
673 struct ust_app_ctx *ua_ctx;
674
675 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
676 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
677
678 /* Copy event attributes */
679 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
680
681 cds_lfht_for_each_entry(uevent->ctx, &iter, uctx, node) {
682 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
683 if (ua_ctx == NULL) {
684 continue;
685 }
686 hashtable_node_init(&ua_ctx->node,
687 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
688 hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
689 }
690 }
691
692 /*
693 * Copy data between an UST app channel and a LTT channel.
694 */
695 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
696 struct ltt_ust_channel *uchan)
697 {
698 struct cds_lfht_iter iter;
699 struct cds_lfht_node *ua_event_node;
700 struct ltt_ust_event *uevent;
701 struct ltt_ust_context *uctx;
702 struct ust_app_event *ua_event;
703 struct ust_app_ctx *ua_ctx;
704
705 DBG2("Shadow copy of UST app channel %s", ua_chan->name);
706
707 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
708 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
709 /* Copy event attributes */
710 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
711
712 cds_lfht_for_each_entry(uchan->ctx, &iter, uctx, node) {
713 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
714 if (ua_ctx == NULL) {
715 continue;
716 }
717 hashtable_node_init(&ua_ctx->node,
718 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
719 hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
720 }
721
722 /* Copy all events from ltt ust channel to ust app channel */
723 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
724 struct cds_lfht_iter uiter;
725
726 ua_event_node = hashtable_lookup(ua_chan->events,
727 (void *) uevent->attr.name, strlen(uevent->attr.name),
728 &uiter);
729 if (ua_event_node == NULL) {
730 DBG2("UST event %s not found on shadow copy channel",
731 uevent->attr.name);
732 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
733 if (ua_event == NULL) {
734 continue;
735 }
736 shadow_copy_event(ua_event, uevent);
737 hashtable_add_unique(ua_chan->events, &ua_event->node);
738 }
739 }
740
741 DBG3("Shadow copy channel done");
742 }
743
744 /*
745 * Copy data between a UST app session and a regular LTT session.
746 */
747 static void shadow_copy_session(struct ust_app_session *ua_sess,
748 struct ltt_ust_session *usess,
749 struct ust_app *app)
750 {
751 struct cds_lfht_node *ua_chan_node;
752 struct cds_lfht_iter iter;
753 struct ltt_ust_channel *uchan;
754 struct ust_app_channel *ua_chan;
755 time_t rawtime;
756 struct tm *timeinfo;
757 char datetime[16];
758 int ret;
759
760 /* Get date and time for unique app path */
761 time(&rawtime);
762 timeinfo = localtime(&rawtime);
763 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
764
765 DBG2("Shadow copy of session handle %d", ua_sess->handle);
766
767 ua_sess->uid = usess->uid;
768
769 ret = snprintf(ua_sess->path, PATH_MAX,
770 "%s/%s-%d-%s",
771 usess->pathname, app->name, app->key.pid,
772 datetime);
773 if (ret < 0) {
774 PERROR("asprintf UST shadow copy session");
775 /* TODO: We cannot return an error from here.. */
776 assert(0);
777 }
778
779 /* TODO: support all UST domain */
780
781 /* Iterate over all channels in global domain. */
782 cds_lfht_for_each_entry(usess->domain_global.channels, &iter,
783 uchan, node) {
784 struct cds_lfht_iter uiter;
785
786 ua_chan_node = hashtable_lookup(ua_sess->channels,
787 (void *)uchan->name, strlen(uchan->name),
788 &uiter);
789 if (ua_chan_node != NULL) {
790 continue;
791 }
792
793 DBG2("Channel %s not found on shadow session copy, creating it",
794 uchan->name);
795 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
796 if (ua_chan == NULL) {
797 /* malloc failed... continuing */
798 continue;
799 }
800
801 shadow_copy_channel(ua_chan, uchan);
802 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
803 }
804 }
805
806 /*
807 * Lookup sesison wrapper.
808 */
809 static
810 void __lookup_session_by_app(struct ltt_ust_session *usess,
811 struct ust_app *app, struct cds_lfht_iter *iter)
812 {
813 /* Get right UST app session from app */
814 (void) hashtable_lookup(app->sessions,
815 (void *) ((unsigned long) usess->uid), sizeof(void *),
816 iter);
817 }
818
819 /*
820 * Return ust app session from the app session hashtable using the UST session
821 * uid.
822 */
823 static struct ust_app_session *lookup_session_by_app(
824 struct ltt_ust_session *usess, struct ust_app *app)
825 {
826 struct cds_lfht_iter iter;
827 struct cds_lfht_node *node;
828
829 __lookup_session_by_app(usess, app, &iter);
830 node = hashtable_iter_get_node(&iter);
831 if (node == NULL) {
832 goto error;
833 }
834
835 return caa_container_of(node, struct ust_app_session, node);
836
837 error:
838 return NULL;
839 }
840
841 /*
842 * Create a UST session onto the tracer of app and add it the session
843 * hashtable.
844 *
845 * Return ust app session or NULL on error.
846 */
847 static struct ust_app_session *create_ust_app_session(
848 struct ltt_ust_session *usess, struct ust_app *app)
849 {
850 int ret;
851 struct ust_app_session *ua_sess;
852
853 ua_sess = lookup_session_by_app(usess, app);
854 if (ua_sess == NULL) {
855 DBG2("UST app pid: %d session uid %d not found, creating it",
856 app->key.pid, usess->uid);
857 ua_sess = alloc_ust_app_session();
858 if (ua_sess == NULL) {
859 /* Only malloc can failed so something is really wrong */
860 goto error;
861 }
862 shadow_copy_session(ua_sess, usess, app);
863 }
864
865 if (ua_sess->handle == -1) {
866 ret = ustctl_create_session(app->key.sock);
867 if (ret < 0) {
868 ERR("Error creating session for app pid %d, sock %d",
869 app->key.pid, app->key.sock);
870 /* TODO: free() ua_sess */
871 goto error;
872 }
873
874 DBG2("UST app ustctl create session handle %d", ret);
875 ua_sess->handle = ret;
876
877 /* Add ust app session to app's HT */
878 hashtable_node_init(&ua_sess->node,
879 (void *)((unsigned long) ua_sess->uid), sizeof(void *));
880 hashtable_add_unique(app->sessions, &ua_sess->node);
881
882 DBG2("UST app session created successfully with handle %d", ret);
883 }
884
885 return ua_sess;
886
887 error:
888 return NULL;
889 }
890
891 /*
892 * Create a context for the channel on the tracer.
893 */
894 static
895 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
896 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
897 struct ust_app *app)
898 {
899 int ret = 0;
900 struct cds_lfht_iter iter;
901 struct cds_lfht_node *node;
902 struct ust_app_ctx *ua_ctx;
903
904 DBG2("UST app adding context to channel %s", ua_chan->name);
905
906 node = hashtable_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx),
907 sizeof(void *), &iter);
908 if (node != NULL) {
909 ret = -EEXIST;
910 goto error;
911 }
912
913 ua_ctx = alloc_ust_app_ctx(uctx);
914 if (ua_ctx == NULL) {
915 /* malloc failed */
916 ret = -1;
917 goto error;
918 }
919
920 hashtable_node_init(&ua_ctx->node,
921 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
922 hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
923
924 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
925 if (ret < 0) {
926 goto error;
927 }
928
929 error:
930 return ret;
931 }
932
933 /*
934 * Create an UST context and enable it for the event on the tracer.
935 */
936 static
937 int create_ust_app_event_context(struct ust_app_session *ua_sess,
938 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
939 struct ust_app *app)
940 {
941 int ret = 0;
942 struct cds_lfht_iter iter;
943 struct cds_lfht_node *node;
944 struct ust_app_ctx *ua_ctx;
945
946 DBG2("UST app adding context to event %s", ua_event->name);
947
948 node = hashtable_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx),
949 sizeof(void *), &iter);
950 if (node != NULL) {
951 ret = -EEXIST;
952 goto error;
953 }
954
955 ua_ctx = alloc_ust_app_ctx(uctx);
956 if (ua_ctx == NULL) {
957 /* malloc failed */
958 ret = -1;
959 goto error;
960 }
961
962 hashtable_node_init(&ua_ctx->node,
963 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
964 hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
965
966 ret = create_ust_event_context(ua_event, ua_ctx, app);
967 if (ret < 0) {
968 goto error;
969 }
970
971 error:
972 return ret;
973 }
974
975 /*
976 * Enable on the tracer side a ust app event for the session and channel.
977 */
978 static
979 int enable_ust_app_event(struct ust_app_session *ua_sess,
980 struct ust_app_event *ua_event, struct ust_app *app)
981 {
982 int ret;
983
984 ret = enable_ust_event(app, ua_sess, ua_event);
985 if (ret < 0) {
986 goto error;
987 }
988
989 ua_event->enabled = 1;
990
991 error:
992 return ret;
993 }
994
995 /*
996 * Disable on the tracer side a ust app event for the session and channel.
997 */
998 static int disable_ust_app_event(struct ust_app_session *ua_sess,
999 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event,
1000 struct ust_app *app)
1001 {
1002 int ret;
1003
1004 ret = disable_ust_event(app, ua_sess, ua_event);
1005 if (ret < 0) {
1006 goto error;
1007 }
1008
1009 ua_event->enabled = 0;
1010
1011 error:
1012 return ret;
1013 }
1014
1015 /*
1016 * Lookup ust app channel for session and disable it on the tracer side.
1017 */
1018 static
1019 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1020 struct ust_app_channel *ua_chan, struct ust_app *app)
1021 {
1022 int ret;
1023
1024 ret = disable_ust_channel(app, ua_sess, ua_chan);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 ua_chan->enabled = 0;
1030
1031 error:
1032 return ret;
1033 }
1034
1035 /*
1036 * Lookup ust app channel for session and enable it on the tracer side.
1037 */
1038 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1039 struct ltt_ust_channel *uchan, struct ust_app *app)
1040 {
1041 int ret = 0;
1042 struct cds_lfht_iter iter;
1043 struct cds_lfht_node *ua_chan_node;
1044 struct ust_app_channel *ua_chan;
1045
1046 ua_chan_node = hashtable_lookup(ua_sess->channels,
1047 (void *)uchan->name, strlen(uchan->name), &iter);
1048 if (ua_chan_node == NULL) {
1049 DBG2("Unable to find channel %s in ust session uid %u",
1050 uchan->name, ua_sess->uid);
1051 goto error;
1052 }
1053
1054 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1055
1056 ret = enable_ust_channel(app, ua_sess, ua_chan);
1057 if (ret < 0) {
1058 goto error;
1059 }
1060
1061 error:
1062 return ret;
1063 }
1064
1065 /*
1066 * Create UST app channel and create it on the tracer.
1067 */
1068 static struct ust_app_channel *create_ust_app_channel(
1069 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1070 struct ust_app *app)
1071 {
1072 int ret = 0;
1073 struct cds_lfht_iter iter;
1074 struct cds_lfht_node *ua_chan_node;
1075 struct ust_app_channel *ua_chan;
1076
1077 /* Lookup channel in the ust app session */
1078 ua_chan_node = hashtable_lookup(ua_sess->channels,
1079 (void *)uchan->name, strlen(uchan->name), &iter);
1080 if (ua_chan_node == NULL) {
1081 DBG2("Unable to find channel %s in ust session uid %u",
1082 uchan->name, ua_sess->uid);
1083 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1084 if (ua_chan == NULL) {
1085 goto error;
1086 }
1087 shadow_copy_channel(ua_chan, uchan);
1088
1089 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
1090 } else {
1091 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1092 }
1093
1094 ret = create_ust_channel(app, ua_sess, ua_chan);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 return ua_chan;
1100
1101 error:
1102 return NULL;
1103 }
1104
1105 /*
1106 * Create UST app event and create it on the tracer side.
1107 */
1108 static
1109 int create_ust_app_event(struct ust_app_session *ua_sess,
1110 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1111 struct ust_app *app)
1112 {
1113 int ret = 0;
1114 struct cds_lfht_iter iter;
1115 struct cds_lfht_node *ua_event_node;
1116 struct ust_app_event *ua_event;
1117
1118 /* Get event node */
1119 ua_event_node = hashtable_lookup(ua_chan->events,
1120 (void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
1121 if (ua_event_node != NULL) {
1122 ERR("UST app event %s already exist. Stopping creation.",
1123 uevent->attr.name);
1124 goto end;
1125 }
1126
1127 /* Does not exist so create one */
1128 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1129 if (ua_event == NULL) {
1130 /* Only malloc can failed so something is really wrong */
1131 ret = -ENOMEM;
1132 goto error;
1133 }
1134 shadow_copy_event(ua_event, uevent);
1135
1136 /* Create it on the tracer side */
1137 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1138 if (ret < 0) {
1139 rcu_read_lock();
1140 delete_ust_app_event(app->key.sock, ua_event);
1141 rcu_read_unlock();
1142 goto error;
1143 }
1144
1145 ua_event->enabled = 1;
1146
1147 hashtable_add_unique(ua_chan->events, &ua_event->node);
1148
1149 end:
1150 error:
1151 return ret;
1152 }
1153
1154 /*
1155 * Create UST metadata and open it on the tracer side.
1156 */
1157 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1158 char *pathname, struct ust_app *app)
1159 {
1160 int ret = 0;
1161
1162 if (ua_sess->metadata == NULL) {
1163 /* Allocate UST metadata */
1164 ua_sess->metadata = trace_ust_create_metadata(pathname);
1165 if (ua_sess->metadata == NULL) {
1166 ERR("UST app session %d creating metadata failed",
1167 ua_sess->handle);
1168 goto error;
1169 }
1170
1171 ret = open_ust_metadata(app, ua_sess);
1172 if (ret < 0) {
1173 goto error;
1174 }
1175
1176 DBG2("UST metadata opened for app pid %d", app->key.pid);
1177 }
1178
1179 /* Open UST metadata stream */
1180 if (ua_sess->metadata->stream_obj == NULL) {
1181 ret = create_ust_stream(app, ua_sess);
1182 if (ret < 0) {
1183 goto error;
1184 }
1185
1186 ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG);
1187 if (ret < 0) {
1188 PERROR("mkdir UST metadata");
1189 goto error;
1190 }
1191
1192 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1193 "%s/metadata", ua_sess->path);
1194 if (ret < 0) {
1195 PERROR("asprintf UST create stream");
1196 goto error;
1197 }
1198
1199 DBG2("UST metadata stream object created for app pid %d",
1200 app->key.pid);
1201 } else {
1202 ERR("Attempting to create stream without metadata opened");
1203 goto error;
1204 }
1205
1206 return 0;
1207
1208 error:
1209 return -1;
1210 }
1211
1212 /*
1213 * Return pointer to traceable apps list.
1214 */
1215 struct cds_lfht *ust_app_get_ht(void)
1216 {
1217 return ust_app_ht;
1218 }
1219
1220 /*
1221 * Return ust app pointer or NULL if not found.
1222 */
1223 struct ust_app *ust_app_find_by_pid(pid_t pid)
1224 {
1225 struct cds_lfht_node *node;
1226 struct cds_lfht_iter iter;
1227
1228 rcu_read_lock();
1229 node = hashtable_lookup(ust_app_ht,
1230 (void *)((unsigned long) pid), sizeof(void *), &iter);
1231 if (node == NULL) {
1232 DBG2("UST app no found with pid %d", pid);
1233 goto error;
1234 }
1235 rcu_read_unlock();
1236
1237 DBG2("Found UST app by pid %d", pid);
1238
1239 return caa_container_of(node, struct ust_app, node);
1240
1241 error:
1242 rcu_read_unlock();
1243 return NULL;
1244 }
1245
1246 /*
1247 * Using pid and uid (of the app), allocate a new ust_app struct and
1248 * add it to the global traceable app list.
1249 *
1250 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1251 * bitness is not supported.
1252 */
1253 int ust_app_register(struct ust_register_msg *msg, int sock)
1254 {
1255 struct ust_app *lta;
1256
1257 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1258 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1259 ERR("Registration failed: application \"%s\" (pid: %d) has "
1260 "%d-bit long, but no consumerd for this long size is available.\n",
1261 msg->name, msg->pid, msg->bits_per_long);
1262 close(sock);
1263 return -EINVAL;
1264 }
1265 lta = zmalloc(sizeof(struct ust_app));
1266 if (lta == NULL) {
1267 PERROR("malloc");
1268 return -ENOMEM;
1269 }
1270
1271 lta->ppid = msg->ppid;
1272 lta->uid = msg->uid;
1273 lta->gid = msg->gid;
1274 lta->bits_per_long = msg->bits_per_long;
1275 lta->v_major = msg->major;
1276 lta->v_minor = msg->minor;
1277 strncpy(lta->name, msg->name, sizeof(lta->name));
1278 lta->name[16] = '\0';
1279 lta->sessions = hashtable_new(0);
1280
1281 /* Set key map */
1282 lta->key.pid = msg->pid;
1283 hashtable_node_init(&lta->node, (void *)((unsigned long)lta->key.pid),
1284 sizeof(void *));
1285 lta->key.sock = sock;
1286 hashtable_node_init(&lta->key.node, (void *)((unsigned long)lta->key.sock),
1287 sizeof(void *));
1288
1289 rcu_read_lock();
1290 hashtable_add_unique(ust_app_sock_key_map, &lta->key.node);
1291 hashtable_add_unique(ust_app_ht, &lta->node);
1292 rcu_read_unlock();
1293
1294 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1295 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1296 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1297
1298 return 0;
1299 }
1300
1301 /*
1302 * Unregister app by removing it from the global traceable app list and freeing
1303 * the data struct.
1304 *
1305 * The socket is already closed at this point so no close to sock.
1306 */
1307 void ust_app_unregister(int sock)
1308 {
1309 struct ust_app *lta;
1310 struct cds_lfht_node *node;
1311 struct cds_lfht_iter iter;
1312 int ret;
1313
1314 rcu_read_lock();
1315 lta = find_app_by_sock(sock);
1316 if (lta == NULL) {
1317 ERR("Unregister app sock %d not found!", sock);
1318 goto error;
1319 }
1320
1321 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1322
1323 /* Get the node reference for a call_rcu */
1324 node = hashtable_lookup(ust_app_ht,
1325 (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter);
1326 if (node == NULL) {
1327 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1328 goto error;
1329 }
1330
1331 ret = hashtable_del(ust_app_ht, &iter);
1332 assert(!ret);
1333 call_rcu(&node->head, delete_ust_app_rcu);
1334 error:
1335 rcu_read_unlock();
1336 return;
1337 }
1338
1339 /*
1340 * Return traceable_app_count
1341 */
1342 unsigned long ust_app_list_count(void)
1343 {
1344 unsigned long count;
1345
1346 rcu_read_lock();
1347 count = hashtable_get_count(ust_app_ht);
1348 rcu_read_unlock();
1349
1350 return count;
1351 }
1352
1353 /*
1354 * Fill events array with all events name of all registered apps.
1355 */
1356 int ust_app_list_events(struct lttng_event **events)
1357 {
1358 int ret, handle;
1359 size_t nbmem, count = 0;
1360 struct cds_lfht_iter iter;
1361 struct ust_app *app;
1362 struct lttng_event *tmp;
1363
1364 nbmem = UST_APP_EVENT_LIST_SIZE;
1365 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1366 if (tmp == NULL) {
1367 PERROR("zmalloc ust app events");
1368 ret = -ENOMEM;
1369 goto error;
1370 }
1371
1372 rcu_read_lock();
1373
1374 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1375 handle = ustctl_tracepoint_list(app->key.sock);
1376 if (handle < 0) {
1377 ERR("UST app list events getting handle failed for app pid %d",
1378 app->key.pid);
1379 continue;
1380 }
1381
1382 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1383 tmp[count].name)) != -ENOENT) {
1384 if (count > nbmem) {
1385 DBG2("Reallocating event list from %zu to %zu bytes", nbmem,
1386 nbmem + UST_APP_EVENT_LIST_SIZE);
1387 nbmem += UST_APP_EVENT_LIST_SIZE;
1388 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1389 if (tmp == NULL) {
1390 PERROR("realloc ust app events");
1391 ret = -ENOMEM;
1392 goto rcu_error;
1393 }
1394 }
1395
1396 tmp[count].type = LTTNG_UST_TRACEPOINT;
1397 tmp[count].pid = app->key.pid;
1398 tmp[count].enabled = -1;
1399 count++;
1400 }
1401 }
1402
1403 ret = count;
1404 *events = tmp;
1405
1406 DBG2("UST app list events done (%zu events)", count);
1407
1408 rcu_error:
1409 rcu_read_unlock();
1410 error:
1411 return ret;
1412 }
1413
1414 /*
1415 * Free and clean all traceable apps of the global list.
1416 */
1417 void ust_app_clean_list(void)
1418 {
1419 int ret;
1420 struct cds_lfht_iter iter;
1421 struct ust_app *app;
1422
1423 DBG2("UST app cleaning registered apps hash table");
1424
1425 rcu_read_lock();
1426
1427 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1428 ret = hashtable_del(ust_app_ht, &iter);
1429 assert(!ret);
1430 call_rcu(&iter.node->head, delete_ust_app_rcu);
1431 }
1432
1433 hashtable_destroy(ust_app_ht);
1434 hashtable_destroy(ust_app_sock_key_map);
1435
1436 rcu_read_unlock();
1437 }
1438
1439 /*
1440 * Init UST app hash table.
1441 */
1442 void ust_app_ht_alloc(void)
1443 {
1444 ust_app_ht = hashtable_new(0);
1445 ust_app_sock_key_map = hashtable_new(0);
1446 }
1447
1448 /*
1449 * For a specific UST session, disable the channel for all registered apps.
1450 */
1451 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1452 struct ltt_ust_channel *uchan)
1453 {
1454 int ret = 0;
1455 struct cds_lfht_iter iter;
1456 struct cds_lfht_node *ua_chan_node;
1457 struct ust_app *app;
1458 struct ust_app_session *ua_sess;
1459 struct ust_app_channel *ua_chan;
1460
1461 if (usess == NULL || uchan == NULL) {
1462 ERR("Disabling UST global channel with NULL values");
1463 ret = -1;
1464 goto error;
1465 }
1466
1467 DBG2("UST app disabling channel %s from global domain for session uid %d",
1468 uchan->name, usess->uid);
1469
1470 rcu_read_lock();
1471
1472 /* For every registered applications */
1473 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1474 ua_sess = lookup_session_by_app(usess, app);
1475 if (ua_sess == NULL) {
1476 continue;
1477 }
1478
1479 /* Get channel */
1480 ua_chan_node = hashtable_lookup(ua_sess->channels,
1481 (void *)uchan->name, strlen(uchan->name), &iter);
1482 /* If the session if found for the app, the channel must be there */
1483 assert(ua_chan_node);
1484
1485 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1486 /* The channel must not be already disabled */
1487 assert(ua_chan->enabled == 1);
1488
1489 /* Disable channel onto application */
1490 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1491 if (ret < 0) {
1492 /* XXX: We might want to report this error at some point... */
1493 continue;
1494 }
1495 }
1496
1497 rcu_read_unlock();
1498
1499 error:
1500 return ret;
1501 }
1502
1503 /*
1504 * For a specific UST session, enable the channel for all registered apps.
1505 */
1506 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1507 struct ltt_ust_channel *uchan)
1508 {
1509 int ret = 0;
1510 struct cds_lfht_iter iter;
1511 struct ust_app *app;
1512 struct ust_app_session *ua_sess;
1513
1514 if (usess == NULL || uchan == NULL) {
1515 ERR("Adding UST global channel to NULL values");
1516 ret = -1;
1517 goto error;
1518 }
1519
1520 DBG2("UST app enabling channel %s to global domain for session uid %d",
1521 uchan->name, usess->uid);
1522
1523 rcu_read_lock();
1524
1525 /* For every registered applications */
1526 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1527 ua_sess = lookup_session_by_app(usess, app);
1528 if (ua_sess == NULL) {
1529 continue;
1530 }
1531
1532 /* Enable channel onto application */
1533 ret = enable_ust_app_channel(ua_sess, uchan, app);
1534 if (ret < 0) {
1535 /* XXX: We might want to report this error at some point... */
1536 continue;
1537 }
1538 }
1539
1540 rcu_read_unlock();
1541
1542 error:
1543 return ret;
1544 }
1545
1546 /*
1547 * Disable an event in a channel and for a specific session.
1548 */
1549 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1550 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1551 {
1552 int ret = 0;
1553 struct cds_lfht_iter iter, uiter;
1554 struct cds_lfht_node *ua_chan_node, *ua_event_node;
1555 struct ust_app *app;
1556 struct ust_app_session *ua_sess;
1557 struct ust_app_channel *ua_chan;
1558 struct ust_app_event *ua_event;
1559
1560 DBG("UST app disabling event %s for all apps in channel "
1561 "%s for session uid %d", uevent->attr.name, uchan->name, usess->uid);
1562
1563 rcu_read_lock();
1564
1565 /* For all registered applications */
1566 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1567 ua_sess = lookup_session_by_app(usess, app);
1568 if (ua_sess == NULL) {
1569 /* Next app */
1570 continue;
1571 }
1572
1573 /* Lookup channel in the ust app session */
1574 ua_chan_node = hashtable_lookup(ua_sess->channels,
1575 (void *)uchan->name, strlen(uchan->name), &uiter);
1576 if (ua_chan_node == NULL) {
1577 DBG2("Channel %s not found in session uid %d for app pid %d."
1578 "Skipping", uchan->name, usess->uid, app->key.pid);
1579 continue;
1580 }
1581 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1582
1583 ua_event_node = hashtable_lookup(ua_chan->events,
1584 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
1585 if (ua_event_node == NULL) {
1586 DBG2("Event %s not found in channel %s for app pid %d."
1587 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1588 continue;
1589 }
1590 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1591
1592 ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app);
1593 if (ret < 0) {
1594 /* XXX: Report error someday... */
1595 continue;
1596 }
1597 }
1598
1599 rcu_read_unlock();
1600
1601 return ret;
1602 }
1603
1604 /*
1605 * For a specific UST session and UST channel, the event for all
1606 * registered apps.
1607 */
1608 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1609 struct ltt_ust_channel *uchan)
1610 {
1611 int ret = 0;
1612 struct cds_lfht_iter iter, uiter;
1613 struct cds_lfht_node *ua_chan_node;
1614 struct ust_app *app;
1615 struct ust_app_session *ua_sess;
1616 struct ust_app_channel *ua_chan;
1617 struct ust_app_event *ua_event;
1618
1619 DBG("UST app disabling all event for all apps in channel "
1620 "%s for session uid %d", uchan->name, usess->uid);
1621
1622 rcu_read_lock();
1623
1624 /* For all registered applications */
1625 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1626 ua_sess = lookup_session_by_app(usess, app);
1627 /* If ua_sess is NULL, there is a code flow error */
1628 assert(ua_sess);
1629
1630 /* Lookup channel in the ust app session */
1631 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1632 strlen(uchan->name), &uiter);
1633 /* If the channel is not found, there is a code flow error */
1634 assert(ua_chan_node);
1635
1636 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1637
1638 /* Disable each events of channel */
1639 cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
1640 ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app);
1641 if (ret < 0) {
1642 /* XXX: Report error someday... */
1643 continue;
1644 }
1645 }
1646 }
1647
1648 rcu_read_unlock();
1649
1650 return ret;
1651 }
1652
1653 /*
1654 * For a specific UST session, create the channel for all registered apps.
1655 */
1656 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1657 struct ltt_ust_channel *uchan)
1658 {
1659 int ret = 0;
1660 struct cds_lfht_iter iter;
1661 struct ust_app *app;
1662 struct ust_app_session *ua_sess;
1663 struct ust_app_channel *ua_chan;
1664
1665 if (usess == NULL || uchan == NULL) {
1666 ERR("Adding UST global channel to NULL values");
1667 ret = -1;
1668 goto error;
1669 }
1670
1671 DBG2("UST app adding channel %s to global domain for session uid %d",
1672 uchan->name, usess->uid);
1673
1674 rcu_read_lock();
1675
1676 /* For every registered applications */
1677 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1678 /*
1679 * Create session on the tracer side and add it to app session HT. Note
1680 * that if session exist, it will simply return a pointer to the ust
1681 * app session.
1682 */
1683 ua_sess = create_ust_app_session(usess, app);
1684 if (ua_sess == NULL) {
1685 continue;
1686 }
1687
1688 /* Create channel onto application */
1689 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1690 if (ua_chan == NULL) {
1691 continue;
1692 }
1693 }
1694
1695 rcu_read_unlock();
1696
1697 error:
1698 return ret;
1699 }
1700
1701 /*
1702 * Enable event for a specific session and channel on the tracer.
1703 */
1704 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1705 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1706 {
1707 int ret = 0;
1708 struct cds_lfht_iter iter, uiter;
1709 struct cds_lfht_node *ua_chan_node, *ua_event_node;
1710 struct ust_app *app;
1711 struct ust_app_session *ua_sess;
1712 struct ust_app_channel *ua_chan;
1713 struct ust_app_event *ua_event;
1714
1715 DBG("UST app enabling event %s for all apps for session uid %d",
1716 uevent->attr.name, usess->uid);
1717
1718 /*
1719 * NOTE: At this point, this function is called only if the session and
1720 * channel passed are already created for all apps. and enabled on the
1721 * tracer also.
1722 */
1723
1724 rcu_read_lock();
1725
1726 /* For all registered applications */
1727 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1728 ua_sess = lookup_session_by_app(usess, app);
1729 /* If ua_sess is NULL, there is a code flow error */
1730 assert(ua_sess);
1731
1732 /* Lookup channel in the ust app session */
1733 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1734 strlen(uchan->name), &uiter);
1735 /* If the channel is not found, there is a code flow error */
1736 assert(ua_chan_node);
1737
1738 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1739
1740 ua_event_node = hashtable_lookup(ua_sess->channels,
1741 (void*)uevent->attr.name, strlen(uevent->attr.name), &uiter);
1742 if (ua_event_node == NULL) {
1743 DBG3("UST app enable event %s not found. Skipping app",
1744 uevent->attr.name);
1745 continue;
1746 }
1747 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1748
1749 ret = enable_ust_app_event(ua_sess, ua_event, app);
1750 if (ret < 0) {
1751 /* XXX: Report error someday... */
1752 continue;
1753 }
1754 }
1755
1756 rcu_read_unlock();
1757
1758 return ret;
1759 }
1760
1761 /*
1762 * For a specific existing UST session and UST channel, creates the event for
1763 * all registered apps.
1764 */
1765 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1766 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1767 {
1768 int ret = 0;
1769 struct cds_lfht_iter iter, uiter;
1770 struct cds_lfht_node *ua_chan_node;
1771 struct ust_app *app;
1772 struct ust_app_session *ua_sess;
1773 struct ust_app_channel *ua_chan;
1774
1775 DBG("UST app creating event %s for all apps for session uid %d",
1776 uevent->attr.name, usess->uid);
1777
1778 /*
1779 * NOTE: At this point, this function is called only if the session and
1780 * channel passed are already created for all apps. and enabled on the
1781 * tracer also.
1782 */
1783
1784 rcu_read_lock();
1785
1786 /* For all registered applications */
1787 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1788 ua_sess = lookup_session_by_app(usess, app);
1789 /* If ua_sess is NULL, there is a code flow error */
1790 assert(ua_sess);
1791
1792 /* Lookup channel in the ust app session */
1793 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1794 strlen(uchan->name), &uiter);
1795 /* If the channel is not found, there is a code flow error */
1796 assert(ua_chan_node);
1797
1798 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1799
1800 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1801 if (ret < 0) {
1802 continue;
1803 }
1804 }
1805
1806 rcu_read_unlock();
1807
1808 return ret;
1809 }
1810
1811 /*
1812 * Start tracing for a specific UST session and app.
1813 */
1814 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1815 {
1816 int ret = 0;
1817 struct cds_lfht_iter iter;
1818 struct ust_app_session *ua_sess;
1819 struct ust_app_channel *ua_chan;
1820 struct ltt_ust_stream *ustream;
1821 int consumerd_fd;
1822
1823 DBG("Starting tracing for ust app pid %d", app->key.pid);
1824
1825 rcu_read_lock();
1826
1827 ua_sess = lookup_session_by_app(usess, app);
1828 if (ua_sess == NULL) {
1829 goto error_rcu_unlock;
1830 }
1831
1832 /* Upon restart, we skip the setup, already done */
1833 if (ua_sess->started) {
1834 goto skip_setup;
1835 }
1836
1837 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1838 if (ret < 0) {
1839 goto error_rcu_unlock;
1840 }
1841
1842 /* For each channel */
1843 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
1844 /* Create all streams */
1845 while (1) {
1846 /* Create UST stream */
1847 ustream = zmalloc(sizeof(*ustream));
1848 if (ustream == NULL) {
1849 PERROR("zmalloc ust stream");
1850 goto error_rcu_unlock;
1851 }
1852
1853 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1854 &ustream->obj);
1855 if (ret < 0) {
1856 /* Got all streams */
1857 break;
1858 }
1859 ustream->handle = ustream->obj->handle;
1860
1861 /* Order is important */
1862 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1863 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1864 ua_sess->path, ua_chan->name,
1865 ua_chan->streams.count++);
1866 if (ret < 0) {
1867 PERROR("asprintf UST create stream");
1868 continue;
1869 }
1870 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1871 ustream->pathname);
1872 }
1873 }
1874
1875 switch (app->bits_per_long) {
1876 case 64:
1877 consumerd_fd = ust_consumerd64_fd;
1878 break;
1879 case 32:
1880 consumerd_fd = ust_consumerd32_fd;
1881 break;
1882 default:
1883 ret = -EINVAL;
1884 goto error_rcu_unlock;
1885 }
1886
1887 /* Setup UST consumer socket and send fds to it */
1888 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1889 if (ret < 0) {
1890 goto error_rcu_unlock;
1891 }
1892 ua_sess->started = 1;
1893
1894 skip_setup:
1895 /* This start the UST tracing */
1896 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1897 if (ret < 0) {
1898 ERR("Error starting tracing for app pid: %d", app->key.pid);
1899 goto error_rcu_unlock;
1900 }
1901
1902 rcu_read_unlock();
1903
1904 /* Quiescent wait after starting trace */
1905 ustctl_wait_quiescent(app->key.sock);
1906
1907 return 0;
1908
1909 error_rcu_unlock:
1910 rcu_read_unlock();
1911 return -1;
1912 }
1913
1914 /*
1915 * Stop tracing for a specific UST session and app.
1916 */
1917 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1918 {
1919 int ret = 0;
1920 struct ust_app_session *ua_sess;
1921
1922 DBG("Stopping tracing for ust app pid %d", app->key.pid);
1923
1924 rcu_read_lock();
1925
1926 ua_sess = lookup_session_by_app(usess, app);
1927 if (ua_sess == NULL) {
1928 /* Only malloc can failed so something is really wrong */
1929 goto error_rcu_unlock;
1930 }
1931
1932 #if 0 /* only useful when periodical flush will be supported */
1933 /* need to keep a handle on shm in session for this. */
1934 /* Flush all buffers before stopping */
1935 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
1936 if (ret < 0) {
1937 ERR("UST metadata flush failed");
1938 }
1939
1940 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
1941 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
1942 if (ret < 0) {
1943 ERR("UST flush buffer error");
1944 }
1945 }
1946 #endif
1947
1948 /* This inhibits UST tracing */
1949 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1950 if (ret < 0) {
1951 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1952 goto error_rcu_unlock;
1953 }
1954
1955 rcu_read_unlock();
1956
1957 /* Quiescent wait after stopping trace */
1958 ustctl_wait_quiescent(app->key.sock);
1959
1960 return 0;
1961
1962 error_rcu_unlock:
1963 rcu_read_unlock();
1964 return -1;
1965 }
1966
1967 /*
1968 * Destroy a specific UST session in apps.
1969 */
1970 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
1971 {
1972 struct ust_app_session *ua_sess;
1973 struct lttng_ust_object_data obj;
1974 struct cds_lfht_iter iter;
1975 struct cds_lfht_node *node;
1976 int ret;
1977
1978 DBG("Destroy tracing for ust app pid %d", app->key.pid);
1979
1980 rcu_read_lock();
1981
1982 __lookup_session_by_app(usess, app, &iter);
1983 node = hashtable_iter_get_node(&iter);
1984 if (node == NULL) {
1985 /* Only malloc can failed so something is really wrong */
1986 goto error_rcu_unlock;
1987 }
1988 ua_sess = caa_container_of(node, struct ust_app_session, node);
1989 ret = hashtable_del(app->sessions, &iter);
1990 assert(!ret);
1991 delete_ust_app_session(app->key.sock, ua_sess);
1992 obj.handle = ua_sess->handle;
1993 obj.shm_fd = -1;
1994 obj.wait_fd = -1;
1995 obj.memory_map_size = 0;
1996 ustctl_release_object(app->key.sock, &obj);
1997
1998 rcu_read_unlock();
1999
2000 /* Quiescent wait after stopping trace */
2001 ustctl_wait_quiescent(app->key.sock);
2002
2003 return 0;
2004
2005 error_rcu_unlock:
2006 rcu_read_unlock();
2007 return -1;
2008 }
2009
2010 /*
2011 * Start tracing for the UST session.
2012 */
2013 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2014 {
2015 int ret = 0;
2016 struct cds_lfht_iter iter;
2017 struct ust_app *app;
2018
2019 DBG("Starting all UST traces");
2020
2021 rcu_read_lock();
2022
2023 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2024 ret = ust_app_start_trace(usess, app);
2025 if (ret < 0) {
2026 /* Continue to next apps even on error */
2027 continue;
2028 }
2029 }
2030
2031 rcu_read_unlock();
2032
2033 return 0;
2034 }
2035
2036 /*
2037 * Start tracing for the UST session.
2038 */
2039 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2040 {
2041 int ret = 0;
2042 struct cds_lfht_iter iter;
2043 struct ust_app *app;
2044
2045 DBG("Stopping all UST traces");
2046
2047 rcu_read_lock();
2048
2049 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2050 ret = ust_app_stop_trace(usess, app);
2051 if (ret < 0) {
2052 /* Continue to next apps even on error */
2053 continue;
2054 }
2055 }
2056
2057 rcu_read_unlock();
2058
2059 return 0;
2060 }
2061
2062 /*
2063 * Destroy app UST session.
2064 */
2065 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2066 {
2067 int ret = 0;
2068 struct cds_lfht_iter iter;
2069 struct ust_app *app;
2070
2071 DBG("Destroy all UST traces");
2072
2073 rcu_read_lock();
2074
2075 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2076 ret = ust_app_destroy_trace(usess, app);
2077 if (ret < 0) {
2078 /* Continue to next apps even on error */
2079 continue;
2080 }
2081 }
2082
2083 rcu_read_unlock();
2084
2085 return 0;
2086 }
2087
2088 /*
2089 * Add channels/events from UST global domain to registered apps at sock.
2090 */
2091 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2092 {
2093 int ret = 0;
2094 struct cds_lfht_iter iter;
2095 struct ust_app *app;
2096 struct ust_app_session *ua_sess;
2097 struct ust_app_channel *ua_chan;
2098 struct ust_app_event *ua_event;
2099
2100 if (usess == NULL) {
2101 ERR("No UST session on global update. Returning");
2102 goto error;
2103 }
2104
2105 DBG2("UST app global update for app sock %d for session uid %d", sock,
2106 usess->uid);
2107
2108 rcu_read_lock();
2109
2110 app = find_app_by_sock(sock);
2111 if (app == NULL) {
2112 ERR("Failed to update app sock %d", sock);
2113 goto error;
2114 }
2115
2116 ua_sess = create_ust_app_session(usess, app);
2117 if (ua_sess == NULL) {
2118 goto error;
2119 }
2120
2121 /*
2122 * We can iterate safely here over all UST app session sicne the create ust
2123 * app session above made a shadow copy of the UST global domain from the
2124 * ltt ust session.
2125 */
2126 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
2127 ret = create_ust_channel(app, ua_sess, ua_chan);
2128 if (ret < 0) {
2129 /* FIXME: Should we quit here or continue... */
2130 continue;
2131 }
2132
2133 /* For each events */
2134 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
2135 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2136 if (ret < 0) {
2137 /* FIXME: Should we quit here or continue... */
2138 continue;
2139 }
2140 }
2141 }
2142
2143 if (usess->start_trace) {
2144 ret = ust_app_start_trace(usess, app);
2145 if (ret < 0) {
2146 goto error;
2147 }
2148
2149 DBG2("UST trace started for app pid %d", app->key.pid);
2150 }
2151
2152 error:
2153 rcu_read_unlock();
2154 return;
2155 }
2156
2157 /*
2158 * Add context to a specific channel for global UST domain.
2159 */
2160 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2161 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2162 {
2163 int ret = 0;
2164 struct cds_lfht_node *ua_chan_node;
2165 struct cds_lfht_iter iter, uiter;
2166 struct ust_app_channel *ua_chan = NULL;
2167 struct ust_app_session *ua_sess;
2168 struct ust_app *app;
2169
2170 rcu_read_lock();
2171
2172 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2173 ua_sess = lookup_session_by_app(usess, app);
2174 if (ua_sess == NULL) {
2175 continue;
2176 }
2177
2178 /* Lookup channel in the ust app session */
2179 ua_chan_node = hashtable_lookup(ua_sess->channels,
2180 (void *)uchan->name, strlen(uchan->name), &uiter);
2181 if (ua_chan_node == NULL) {
2182 continue;
2183 }
2184 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2185 node);
2186
2187 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2188 if (ret < 0) {
2189 continue;
2190 }
2191 }
2192
2193 /* Add ltt UST context node to ltt UST channel */
2194 hashtable_add_unique(uchan->ctx, &uctx->node);
2195
2196 rcu_read_unlock();
2197 return ret;
2198 }
2199
2200 /*
2201 * Add context to a specific event in a channel for global UST domain.
2202 */
2203 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2204 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2205 struct ltt_ust_context *uctx)
2206 {
2207 int ret = 0;
2208 struct cds_lfht_node *ua_chan_node, *ua_event_node;
2209 struct cds_lfht_iter iter, uiter;
2210 struct ust_app_session *ua_sess;
2211 struct ust_app_event *ua_event;
2212 struct ust_app_channel *ua_chan = NULL;
2213 struct ust_app *app;
2214
2215 rcu_read_lock();
2216
2217 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2218 ua_sess = lookup_session_by_app(usess, app);
2219 if (ua_sess == NULL) {
2220 continue;
2221 }
2222
2223 /* Lookup channel in the ust app session */
2224 ua_chan_node = hashtable_lookup(ua_sess->channels,
2225 (void *)uchan->name, strlen(uchan->name), &uiter);
2226 if (ua_chan_node == NULL) {
2227 continue;
2228 }
2229 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2230 node);
2231
2232 ua_event_node = hashtable_lookup(ua_chan->events,
2233 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
2234 if (ua_event_node == NULL) {
2235 continue;
2236 }
2237 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2238 node);
2239
2240 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2241 if (ret < 0) {
2242 continue;
2243 }
2244 }
2245
2246 /* Add ltt UST context node to ltt UST event */
2247 hashtable_add_unique(uevent->ctx, &uctx->node);
2248
2249 rcu_read_unlock();
2250 return ret;
2251 }
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