6f73c6df34a4006353ab1796e35743c51b2dd2a2
[lttng-tools.git] / src / bin / 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 modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <errno.h>
20 #include <pthread.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <urcu/compiler.h>
28
29 #include <common/common.h>
30 #include <common/sessiond-comm/sessiond-comm.h>
31
32 #include "fd-limit.h"
33 #include "health.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 lttng_ht_iter iter;
61 struct ust_app_ctx *ua_ctx;
62
63 /* Destroy each context of event */
64 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
65 node.node) {
66 ret = lttng_ht_del(ua_event->ctx, &iter);
67 assert(!ret);
68 delete_ust_app_ctx(sock, ua_ctx);
69 }
70 free(ua_event->filter);
71 lttng_ht_destroy(ua_event->ctx);
72
73 if (ua_event->obj != NULL) {
74 ustctl_release_object(sock, ua_event->obj);
75 free(ua_event->obj);
76 }
77 free(ua_event);
78 }
79
80 /*
81 * Delete ust app stream safely. RCU read lock must be held before calling
82 * this function.
83 */
84 static
85 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
86 {
87 if (stream->obj) {
88 ustctl_release_object(sock, stream->obj);
89 lttng_fd_put(LTTNG_FD_APPS, 2);
90 free(stream->obj);
91 }
92 free(stream);
93 }
94
95 /*
96 * Delete ust app channel safely. RCU read lock must be held before calling
97 * this function.
98 */
99 static
100 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
101 {
102 int ret;
103 struct lttng_ht_iter iter;
104 struct ust_app_event *ua_event;
105 struct ust_app_ctx *ua_ctx;
106 struct ltt_ust_stream *stream, *stmp;
107
108 /* Wipe stream */
109 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
110 cds_list_del(&stream->list);
111 delete_ust_app_stream(sock, stream);
112 }
113
114 /* Wipe context */
115 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
116 ret = lttng_ht_del(ua_chan->ctx, &iter);
117 assert(!ret);
118 delete_ust_app_ctx(sock, ua_ctx);
119 }
120 lttng_ht_destroy(ua_chan->ctx);
121
122 /* Wipe events */
123 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
124 node.node) {
125 ret = lttng_ht_del(ua_chan->events, &iter);
126 assert(!ret);
127 delete_ust_app_event(sock, ua_event);
128 }
129 lttng_ht_destroy(ua_chan->events);
130
131 if (ua_chan->obj != NULL) {
132 ustctl_release_object(sock, ua_chan->obj);
133 lttng_fd_put(LTTNG_FD_APPS, 2);
134 free(ua_chan->obj);
135 }
136 free(ua_chan);
137 }
138
139 /*
140 * Delete ust app session safely. RCU read lock must be held before calling
141 * this function.
142 */
143 static
144 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
145 {
146 int ret;
147 struct lttng_ht_iter iter;
148 struct ust_app_channel *ua_chan;
149
150 if (ua_sess->metadata) {
151 if (ua_sess->metadata->stream_obj) {
152 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
153 lttng_fd_put(LTTNG_FD_APPS, 2);
154 free(ua_sess->metadata->stream_obj);
155 }
156 if (ua_sess->metadata->obj) {
157 ustctl_release_object(sock, ua_sess->metadata->obj);
158 lttng_fd_put(LTTNG_FD_APPS, 2);
159 free(ua_sess->metadata->obj);
160 }
161 trace_ust_destroy_metadata(ua_sess->metadata);
162 }
163
164 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
165 node.node) {
166 ret = lttng_ht_del(ua_sess->channels, &iter);
167 assert(!ret);
168 delete_ust_app_channel(sock, ua_chan);
169 }
170 lttng_ht_destroy(ua_sess->channels);
171
172 if (ua_sess->handle != -1) {
173 ustctl_release_handle(sock, ua_sess->handle);
174 }
175 free(ua_sess);
176 }
177
178 /*
179 * Delete a traceable application structure from the global list. Never call
180 * this function outside of a call_rcu call.
181 */
182 static
183 void delete_ust_app(struct ust_app *app)
184 {
185 int ret, sock;
186 struct lttng_ht_iter iter;
187 struct ust_app_session *ua_sess;
188
189 rcu_read_lock();
190
191 /* Delete ust app sessions info */
192 sock = app->sock;
193 app->sock = -1;
194
195 /* Wipe sessions */
196 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
197 node.node) {
198 ret = lttng_ht_del(app->sessions, &iter);
199 assert(!ret);
200 delete_ust_app_session(app->sock, ua_sess);
201 }
202 lttng_ht_destroy(app->sessions);
203
204 /*
205 * Wait until we have deleted the application from the sock hash table
206 * before closing this socket, otherwise an application could re-use the
207 * socket ID and race with the teardown, using the same hash table entry.
208 *
209 * It's OK to leave the close in call_rcu. We want it to stay unique for
210 * all RCU readers that could run concurrently with unregister app,
211 * therefore we _need_ to only close that socket after a grace period. So
212 * it should stay in this RCU callback.
213 *
214 * This close() is a very important step of the synchronization model so
215 * every modification to this function must be carefully reviewed.
216 */
217 ret = close(sock);
218 if (ret) {
219 PERROR("close");
220 }
221 lttng_fd_put(LTTNG_FD_APPS, 1);
222
223 DBG2("UST app pid %d deleted", app->pid);
224 free(app);
225
226 rcu_read_unlock();
227 }
228
229 /*
230 * URCU intermediate call to delete an UST app.
231 */
232 static
233 void delete_ust_app_rcu(struct rcu_head *head)
234 {
235 struct lttng_ht_node_ulong *node =
236 caa_container_of(head, struct lttng_ht_node_ulong, head);
237 struct ust_app *app =
238 caa_container_of(node, struct ust_app, pid_n);
239
240 DBG3("Call RCU deleting app PID %d", app->pid);
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 = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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 = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
291 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
292 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
293
294 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
295
296 /* Copy attributes */
297 if (attr) {
298 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
299 }
300
301 DBG3("UST app channel %s allocated", ua_chan->name);
302
303 return ua_chan;
304
305 error:
306 return NULL;
307 }
308
309 /*
310 * Alloc new UST app event.
311 */
312 static
313 struct ust_app_event *alloc_ust_app_event(char *name,
314 struct lttng_ust_event *attr)
315 {
316 struct ust_app_event *ua_event;
317
318 /* Init most of the default value by allocating and zeroing */
319 ua_event = zmalloc(sizeof(struct ust_app_event));
320 if (ua_event == NULL) {
321 PERROR("malloc");
322 goto error;
323 }
324
325 ua_event->enabled = 1;
326 strncpy(ua_event->name, name, sizeof(ua_event->name));
327 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
328 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
329 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
330
331 /* Copy attributes */
332 if (attr) {
333 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
334 }
335
336 DBG3("UST app event %s allocated", ua_event->name);
337
338 return ua_event;
339
340 error:
341 return NULL;
342 }
343
344 /*
345 * Alloc new UST app context.
346 */
347 static
348 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
349 {
350 struct ust_app_ctx *ua_ctx;
351
352 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
353 if (ua_ctx == NULL) {
354 goto error;
355 }
356
357 if (uctx) {
358 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
359 }
360
361 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
362
363 error:
364 return ua_ctx;
365 }
366
367 /*
368 * Find an ust_app using the sock and return it. RCU read side lock must be
369 * held before calling this helper function.
370 */
371 static
372 struct ust_app *find_app_by_sock(int sock)
373 {
374 struct lttng_ht_node_ulong *node;
375 struct lttng_ht_iter iter;
376
377 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
378 node = lttng_ht_iter_get_node_ulong(&iter);
379 if (node == NULL) {
380 DBG2("UST app find by sock %d not found", sock);
381 goto error;
382 }
383
384 return caa_container_of(node, struct ust_app, sock_n);
385
386 error:
387 return NULL;
388 }
389
390 /*
391 * Create the channel context on the tracer.
392 */
393 static
394 int create_ust_channel_context(struct ust_app_channel *ua_chan,
395 struct ust_app_ctx *ua_ctx, struct ust_app *app)
396 {
397 int ret;
398
399 health_code_update(&health_thread_cmd);
400
401 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
402 ua_chan->obj, &ua_ctx->obj);
403 if (ret < 0) {
404 goto error;
405 }
406
407 ua_ctx->handle = ua_ctx->obj->handle;
408
409 DBG2("UST app context created successfully for channel %s", ua_chan->name);
410
411 error:
412 health_code_update(&health_thread_cmd);
413 return ret;
414 }
415
416 /*
417 * Create the event context on the tracer.
418 */
419 static
420 int create_ust_event_context(struct ust_app_event *ua_event,
421 struct ust_app_ctx *ua_ctx, struct ust_app *app)
422 {
423 int ret;
424
425 health_code_update(&health_thread_cmd);
426
427 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
428 ua_event->obj, &ua_ctx->obj);
429 if (ret < 0) {
430 goto error;
431 }
432
433 ua_ctx->handle = ua_ctx->obj->handle;
434
435 DBG2("UST app context created successfully for event %s", ua_event->name);
436
437 error:
438 health_code_update(&health_thread_cmd);
439 return ret;
440 }
441
442 /*
443 * Set the filter on the tracer.
444 */
445 static
446 int set_ust_event_filter(struct ust_app_event *ua_event,
447 struct ust_app *app)
448 {
449 int ret;
450
451 health_code_update(&health_thread_cmd);
452
453 if (!ua_event->filter) {
454 ret = 0;
455 goto error;
456 }
457
458 ret = ustctl_set_filter(app->sock, ua_event->filter,
459 ua_event->obj);
460 if (ret < 0) {
461 goto error;
462 }
463
464 DBG2("UST filter set successfully for event %s", ua_event->name);
465
466 error:
467 health_code_update(&health_thread_cmd);
468 return ret;
469 }
470
471 /*
472 * Disable the specified event on to UST tracer for the UST session.
473 */
474 static int disable_ust_event(struct ust_app *app,
475 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
476 {
477 int ret;
478
479 health_code_update(&health_thread_cmd);
480
481 ret = ustctl_disable(app->sock, ua_event->obj);
482 if (ret < 0) {
483 ERR("UST app event %s disable failed for app (pid: %d) "
484 "and session handle %d with ret %d",
485 ua_event->attr.name, app->pid, ua_sess->handle, ret);
486 goto error;
487 }
488
489 DBG2("UST app event %s disabled successfully for app (pid: %d)",
490 ua_event->attr.name, app->pid);
491
492 error:
493 health_code_update(&health_thread_cmd);
494 return ret;
495 }
496
497 /*
498 * Disable the specified channel on to UST tracer for the UST session.
499 */
500 static int disable_ust_channel(struct ust_app *app,
501 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
502 {
503 int ret;
504
505 health_code_update(&health_thread_cmd);
506
507 ret = ustctl_disable(app->sock, ua_chan->obj);
508 if (ret < 0) {
509 ERR("UST app channel %s disable failed for app (pid: %d) "
510 "and session handle %d with ret %d",
511 ua_chan->name, app->pid, ua_sess->handle, ret);
512 goto error;
513 }
514
515 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
516 ua_chan->name, app->pid);
517
518 error:
519 health_code_update(&health_thread_cmd);
520 return ret;
521 }
522
523 /*
524 * Enable the specified channel on to UST tracer for the UST session.
525 */
526 static int enable_ust_channel(struct ust_app *app,
527 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
528 {
529 int ret;
530
531 health_code_update(&health_thread_cmd);
532
533 ret = ustctl_enable(app->sock, ua_chan->obj);
534 if (ret < 0) {
535 ERR("UST app channel %s enable failed for app (pid: %d) "
536 "and session handle %d with ret %d",
537 ua_chan->name, app->pid, ua_sess->handle, ret);
538 goto error;
539 }
540
541 ua_chan->enabled = 1;
542
543 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
544 ua_chan->name, app->pid);
545
546 error:
547 health_code_update(&health_thread_cmd);
548 return ret;
549 }
550
551 /*
552 * Enable the specified event on to UST tracer for the UST session.
553 */
554 static int enable_ust_event(struct ust_app *app,
555 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
556 {
557 int ret;
558
559 health_code_update(&health_thread_cmd);
560
561 ret = ustctl_enable(app->sock, ua_event->obj);
562 if (ret < 0) {
563 ERR("UST app event %s enable failed for app (pid: %d) "
564 "and session handle %d with ret %d",
565 ua_event->attr.name, app->pid, ua_sess->handle, ret);
566 goto error;
567 }
568
569 DBG2("UST app event %s enabled successfully for app (pid: %d)",
570 ua_event->attr.name, app->pid);
571
572 error:
573 health_code_update(&health_thread_cmd);
574 return ret;
575 }
576
577 /*
578 * Open metadata onto the UST tracer for a UST session.
579 */
580 static int open_ust_metadata(struct ust_app *app,
581 struct ust_app_session *ua_sess)
582 {
583 int ret;
584 struct lttng_ust_channel_attr uattr;
585
586 health_code_update(&health_thread_cmd);
587
588 uattr.overwrite = ua_sess->metadata->attr.overwrite;
589 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
590 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
591 uattr.switch_timer_interval =
592 ua_sess->metadata->attr.switch_timer_interval;
593 uattr.read_timer_interval =
594 ua_sess->metadata->attr.read_timer_interval;
595 uattr.output = ua_sess->metadata->attr.output;
596
597 /* We are going to receive 2 fds, we need to reserve them. */
598 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
599 if (ret < 0) {
600 ERR("Exhausted number of available FD upon metadata open");
601 goto error;
602 }
603 /* UST tracer metadata creation */
604 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
605 &ua_sess->metadata->obj);
606 if (ret < 0) {
607 ERR("UST app open metadata failed for app pid:%d with ret %d",
608 app->pid, ret);
609 goto error;
610 }
611
612 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
613
614 error:
615 health_code_update(&health_thread_cmd);
616 return ret;
617 }
618
619 /*
620 * Create stream onto the UST tracer for a UST session.
621 */
622 static int create_ust_stream(struct ust_app *app,
623 struct ust_app_session *ua_sess)
624 {
625 int ret;
626
627 health_code_update(&health_thread_cmd);
628
629 /* We are going to receive 2 fds, we need to reserve them. */
630 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
631 if (ret < 0) {
632 ERR("Exhausted number of available FD upon metadata stream create");
633 goto error;
634 }
635 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
636 &ua_sess->metadata->stream_obj);
637 if (ret < 0) {
638 ERR("UST create metadata stream failed");
639 goto error;
640 }
641
642 error:
643 health_code_update(&health_thread_cmd);
644 return ret;
645 }
646
647 /*
648 * Create the specified channel onto the UST tracer for a UST session.
649 */
650 static int create_ust_channel(struct ust_app *app,
651 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
652 {
653 int ret;
654
655 health_code_update(&health_thread_cmd);
656
657 /* TODO: remove cast and use lttng-ust-abi.h */
658
659 /* We are going to receive 2 fds, we need to reserve them. */
660 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
661 if (ret < 0) {
662 ERR("Exhausted number of available FD upon create channel");
663 goto error;
664 }
665
666 health_code_update(&health_thread_cmd);
667
668 ret = ustctl_create_channel(app->sock, ua_sess->handle,
669 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
670 if (ret < 0) {
671 ERR("Creating channel %s for app (pid: %d, sock: %d) "
672 "and session handle %d with ret %d",
673 ua_chan->name, app->pid, app->sock,
674 ua_sess->handle, ret);
675 lttng_fd_put(LTTNG_FD_APPS, 2);
676 goto error;
677 }
678
679 ua_chan->handle = ua_chan->obj->handle;
680
681 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
682 ua_chan->name, app->pid, app->sock);
683
684 health_code_update(&health_thread_cmd);
685
686 /* If channel is not enabled, disable it on the tracer */
687 if (!ua_chan->enabled) {
688 ret = disable_ust_channel(app, ua_sess, ua_chan);
689 if (ret < 0) {
690 goto error;
691 }
692 }
693
694 error:
695 health_code_update(&health_thread_cmd);
696 return ret;
697 }
698
699 /*
700 * Create the specified event onto the UST tracer for a UST session.
701 */
702 static
703 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
704 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
705 {
706 int ret = 0;
707
708 health_code_update(&health_thread_cmd);
709
710 /* Create UST event on tracer */
711 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
712 &ua_event->obj);
713 if (ret < 0) {
714 if (ret == -EEXIST || ret == -EPERM) {
715 ret = 0;
716 goto error;
717 }
718 ERR("Error ustctl create event %s for app pid: %d with ret %d",
719 ua_event->attr.name, app->pid, ret);
720 goto error;
721 }
722
723 ua_event->handle = ua_event->obj->handle;
724
725 DBG2("UST app event %s created successfully for pid:%d",
726 ua_event->attr.name, app->pid);
727
728 health_code_update(&health_thread_cmd);
729
730 /* If event not enabled, disable it on the tracer */
731 if (ua_event->enabled == 0) {
732 ret = disable_ust_event(app, ua_sess, ua_event);
733 if (ret < 0) {
734 /*
735 * If we hit an EPERM, something is wrong with our disable call. If
736 * we get an EEXIST, there is a problem on the tracer side since we
737 * just created it.
738 */
739 switch (ret) {
740 case -EPERM:
741 /* Code flow problem */
742 assert(0);
743 case -EEXIST:
744 /* It's OK for our use case. */
745 ret = 0;
746 break;
747 default:
748 break;
749 }
750 goto error;
751 }
752 }
753
754 error:
755 health_code_update(&health_thread_cmd);
756 return ret;
757 }
758
759 /*
760 * Copy data between an UST app event and a LTT event.
761 */
762 static void shadow_copy_event(struct ust_app_event *ua_event,
763 struct ltt_ust_event *uevent)
764 {
765 struct lttng_ht_iter iter;
766 struct ltt_ust_context *uctx;
767 struct ust_app_ctx *ua_ctx;
768
769 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
770 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
771
772 ua_event->enabled = uevent->enabled;
773
774 /* Copy event attributes */
775 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
776
777 /* Copy filter bytecode */
778 if (uevent->filter) {
779 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
780 uevent->filter->len);
781 if (!ua_event->filter) {
782 return;
783 }
784 memcpy(ua_event->filter, uevent->filter,
785 sizeof(*ua_event->filter) + uevent->filter->len);
786 }
787 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
788 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
789 if (ua_ctx == NULL) {
790 /* malloc() failed. We should simply stop */
791 return;
792 }
793
794 lttng_ht_node_init_ulong(&ua_ctx->node,
795 (unsigned long) ua_ctx->ctx.ctx);
796 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
797 }
798 }
799
800 /*
801 * Copy data between an UST app channel and a LTT channel.
802 */
803 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
804 struct ltt_ust_channel *uchan)
805 {
806 struct lttng_ht_iter iter;
807 struct lttng_ht_node_str *ua_event_node;
808 struct ltt_ust_event *uevent;
809 struct ltt_ust_context *uctx;
810 struct ust_app_event *ua_event;
811 struct ust_app_ctx *ua_ctx;
812
813 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
814
815 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
816 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
817 /* Copy event attributes */
818 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
819
820 ua_chan->enabled = uchan->enabled;
821
822 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
823 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
824 if (ua_ctx == NULL) {
825 continue;
826 }
827 lttng_ht_node_init_ulong(&ua_ctx->node,
828 (unsigned long) ua_ctx->ctx.ctx);
829 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
830 }
831
832 /* Copy all events from ltt ust channel to ust app channel */
833 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
834 struct lttng_ht_iter uiter;
835
836 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
837 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
838 if (ua_event_node == NULL) {
839 DBG2("UST event %s not found on shadow copy channel",
840 uevent->attr.name);
841 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
842 if (ua_event == NULL) {
843 continue;
844 }
845 shadow_copy_event(ua_event, uevent);
846 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
847 }
848 }
849
850 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
851 }
852
853 /*
854 * Copy data between a UST app session and a regular LTT session.
855 */
856 static void shadow_copy_session(struct ust_app_session *ua_sess,
857 struct ltt_ust_session *usess, struct ust_app *app)
858 {
859 struct lttng_ht_node_str *ua_chan_node;
860 struct lttng_ht_iter iter;
861 struct ltt_ust_channel *uchan;
862 struct ust_app_channel *ua_chan;
863 time_t rawtime;
864 struct tm *timeinfo;
865 char datetime[16];
866 int ret;
867
868 /* Get date and time for unique app path */
869 time(&rawtime);
870 timeinfo = localtime(&rawtime);
871 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
872
873 DBG2("Shadow copy of session handle %d", ua_sess->handle);
874
875 ua_sess->id = usess->id;
876 ua_sess->uid = usess->uid;
877 ua_sess->gid = usess->gid;
878
879 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
880 datetime);
881 if (ret < 0) {
882 PERROR("asprintf UST shadow copy session");
883 /* TODO: We cannot return an error from here.. */
884 assert(0);
885 }
886
887 /* TODO: support all UST domain */
888
889 /* Iterate over all channels in global domain. */
890 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
891 uchan, node.node) {
892 struct lttng_ht_iter uiter;
893
894 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
895 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
896 if (ua_chan_node != NULL) {
897 /* Session exist. Contiuing. */
898 continue;
899 }
900
901 DBG2("Channel %s not found on shadow session copy, creating it",
902 uchan->name);
903 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
904 if (ua_chan == NULL) {
905 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
906 continue;
907 }
908
909 shadow_copy_channel(ua_chan, uchan);
910 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
911 }
912 }
913
914 /*
915 * Lookup sesison wrapper.
916 */
917 static
918 void __lookup_session_by_app(struct ltt_ust_session *usess,
919 struct ust_app *app, struct lttng_ht_iter *iter)
920 {
921 /* Get right UST app session from app */
922 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
923 }
924
925 /*
926 * Return ust app session from the app session hashtable using the UST session
927 * id.
928 */
929 static struct ust_app_session *lookup_session_by_app(
930 struct ltt_ust_session *usess, struct ust_app *app)
931 {
932 struct lttng_ht_iter iter;
933 struct lttng_ht_node_ulong *node;
934
935 __lookup_session_by_app(usess, app, &iter);
936 node = lttng_ht_iter_get_node_ulong(&iter);
937 if (node == NULL) {
938 goto error;
939 }
940
941 return caa_container_of(node, struct ust_app_session, node);
942
943 error:
944 return NULL;
945 }
946
947 /*
948 * Create a UST session onto the tracer of app and add it the session
949 * hashtable.
950 *
951 * Return ust app session or NULL on error.
952 */
953 static struct ust_app_session *create_ust_app_session(
954 struct ltt_ust_session *usess, struct ust_app *app)
955 {
956 int ret;
957 struct ust_app_session *ua_sess;
958
959 health_code_update(&health_thread_cmd);
960
961 ua_sess = lookup_session_by_app(usess, app);
962 if (ua_sess == NULL) {
963 DBG2("UST app pid: %d session id %d not found, creating it",
964 app->pid, usess->id);
965 ua_sess = alloc_ust_app_session();
966 if (ua_sess == NULL) {
967 /* Only malloc can failed so something is really wrong */
968 goto end;
969 }
970 shadow_copy_session(ua_sess, usess, app);
971 }
972
973 health_code_update(&health_thread_cmd);
974
975 if (ua_sess->handle == -1) {
976 ret = ustctl_create_session(app->sock);
977 if (ret < 0) {
978 ERR("Creating session for app pid %d", app->pid);
979 /* This means that the tracer is gone... */
980 ua_sess = (void*) -1UL;
981 goto error;
982 }
983
984 ua_sess->handle = ret;
985
986 /* Add ust app session to app's HT */
987 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
988 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
989
990 DBG2("UST app session created successfully with handle %d", ret);
991 }
992
993 end:
994 health_code_update(&health_thread_cmd);
995 return ua_sess;
996
997 error:
998 delete_ust_app_session(-1, ua_sess);
999 health_code_update(&health_thread_cmd);
1000 return NULL;
1001 }
1002
1003 /*
1004 * Create a context for the channel on the tracer.
1005 */
1006 static
1007 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1008 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1009 struct ust_app *app)
1010 {
1011 int ret = 0;
1012 struct lttng_ht_iter iter;
1013 struct lttng_ht_node_ulong *node;
1014 struct ust_app_ctx *ua_ctx;
1015
1016 DBG2("UST app adding context to channel %s", ua_chan->name);
1017
1018 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1019 node = lttng_ht_iter_get_node_ulong(&iter);
1020 if (node != NULL) {
1021 ret = -EEXIST;
1022 goto error;
1023 }
1024
1025 ua_ctx = alloc_ust_app_ctx(uctx);
1026 if (ua_ctx == NULL) {
1027 /* malloc failed */
1028 ret = -1;
1029 goto error;
1030 }
1031
1032 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1033 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
1034
1035 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1036 if (ret < 0) {
1037 goto error;
1038 }
1039
1040 error:
1041 return ret;
1042 }
1043
1044 /*
1045 * Create an UST context and enable it for the event on the tracer.
1046 */
1047 static
1048 int create_ust_app_event_context(struct ust_app_session *ua_sess,
1049 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1050 struct ust_app *app)
1051 {
1052 int ret = 0;
1053 struct lttng_ht_iter iter;
1054 struct lttng_ht_node_ulong *node;
1055 struct ust_app_ctx *ua_ctx;
1056
1057 DBG2("UST app adding context to event %s", ua_event->name);
1058
1059 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1060 node = lttng_ht_iter_get_node_ulong(&iter);
1061 if (node != NULL) {
1062 ret = -EEXIST;
1063 goto error;
1064 }
1065
1066 ua_ctx = alloc_ust_app_ctx(uctx);
1067 if (ua_ctx == NULL) {
1068 /* malloc failed */
1069 ret = -1;
1070 goto error;
1071 }
1072
1073 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1074 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
1075
1076 ret = create_ust_event_context(ua_event, ua_ctx, app);
1077 if (ret < 0) {
1078 goto error;
1079 }
1080
1081 error:
1082 return ret;
1083 }
1084
1085 /*
1086 * Set UST filter for the event on the tracer.
1087 */
1088 static
1089 int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1090 struct ust_app_event *ua_event,
1091 struct lttng_filter_bytecode *bytecode,
1092 struct ust_app *app)
1093 {
1094 int ret = 0;
1095
1096 DBG2("UST app adding context to event %s", ua_event->name);
1097
1098 /* Copy filter bytecode */
1099 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1100 if (!ua_event->filter) {
1101 return -ENOMEM;
1102 }
1103 memcpy(ua_event->filter, bytecode,
1104 sizeof(*ua_event->filter) + bytecode->len);
1105 ret = set_ust_event_filter(ua_event, app);
1106 if (ret < 0) {
1107 goto error;
1108 }
1109
1110 error:
1111 return ret;
1112 }
1113
1114 /*
1115 * Enable on the tracer side a ust app event for the session and channel.
1116 */
1117 static
1118 int enable_ust_app_event(struct ust_app_session *ua_sess,
1119 struct ust_app_event *ua_event, struct ust_app *app)
1120 {
1121 int ret;
1122
1123 ret = enable_ust_event(app, ua_sess, ua_event);
1124 if (ret < 0) {
1125 goto error;
1126 }
1127
1128 ua_event->enabled = 1;
1129
1130 error:
1131 return ret;
1132 }
1133
1134 /*
1135 * Disable on the tracer side a ust app event for the session and channel.
1136 */
1137 static int disable_ust_app_event(struct ust_app_session *ua_sess,
1138 struct ust_app_event *ua_event, struct ust_app *app)
1139 {
1140 int ret;
1141
1142 ret = disable_ust_event(app, ua_sess, ua_event);
1143 if (ret < 0) {
1144 goto error;
1145 }
1146
1147 ua_event->enabled = 0;
1148
1149 error:
1150 return ret;
1151 }
1152
1153 /*
1154 * Lookup ust app channel for session and disable it on the tracer side.
1155 */
1156 static
1157 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1158 struct ust_app_channel *ua_chan, struct ust_app *app)
1159 {
1160 int ret;
1161
1162 ret = disable_ust_channel(app, ua_sess, ua_chan);
1163 if (ret < 0) {
1164 goto error;
1165 }
1166
1167 ua_chan->enabled = 0;
1168
1169 error:
1170 return ret;
1171 }
1172
1173 /*
1174 * Lookup ust app channel for session and enable it on the tracer side.
1175 */
1176 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1177 struct ltt_ust_channel *uchan, struct ust_app *app)
1178 {
1179 int ret = 0;
1180 struct lttng_ht_iter iter;
1181 struct lttng_ht_node_str *ua_chan_node;
1182 struct ust_app_channel *ua_chan;
1183
1184 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1185 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1186 if (ua_chan_node == NULL) {
1187 DBG2("Unable to find channel %s in ust session id %u",
1188 uchan->name, ua_sess->id);
1189 goto error;
1190 }
1191
1192 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1193
1194 ret = enable_ust_channel(app, ua_sess, ua_chan);
1195 if (ret < 0) {
1196 goto error;
1197 }
1198
1199 error:
1200 return ret;
1201 }
1202
1203 /*
1204 * Create UST app channel and create it on the tracer.
1205 */
1206 static struct ust_app_channel *create_ust_app_channel(
1207 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1208 struct ust_app *app)
1209 {
1210 int ret = 0;
1211 struct lttng_ht_iter iter;
1212 struct lttng_ht_node_str *ua_chan_node;
1213 struct ust_app_channel *ua_chan;
1214
1215 /* Lookup channel in the ust app session */
1216 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1217 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1218 if (ua_chan_node != NULL) {
1219 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1220 goto end;
1221 }
1222
1223 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1224 if (ua_chan == NULL) {
1225 /* Only malloc can fail here */
1226 goto error;
1227 }
1228 shadow_copy_channel(ua_chan, uchan);
1229
1230 ret = create_ust_channel(app, ua_sess, ua_chan);
1231 if (ret < 0) {
1232 /* Not found previously means that it does not exist on the tracer */
1233 assert(ret != -EEXIST);
1234 goto error;
1235 }
1236
1237 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1238
1239 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1240 app->pid);
1241
1242 end:
1243 return ua_chan;
1244
1245 error:
1246 delete_ust_app_channel(-1, ua_chan);
1247 return NULL;
1248 }
1249
1250 /*
1251 * Create UST app event and create it on the tracer side.
1252 */
1253 static
1254 int create_ust_app_event(struct ust_app_session *ua_sess,
1255 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1256 struct ust_app *app)
1257 {
1258 int ret = 0;
1259 struct lttng_ht_iter iter;
1260 struct lttng_ht_node_str *ua_event_node;
1261 struct ust_app_event *ua_event;
1262
1263 /* Get event node */
1264 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1265 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1266 if (ua_event_node != NULL) {
1267 ret = -EEXIST;
1268 goto end;
1269 }
1270
1271 /* Does not exist so create one */
1272 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1273 if (ua_event == NULL) {
1274 /* Only malloc can failed so something is really wrong */
1275 ret = -ENOMEM;
1276 goto end;
1277 }
1278 shadow_copy_event(ua_event, uevent);
1279
1280 /* Create it on the tracer side */
1281 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1282 if (ret < 0) {
1283 /* Not found previously means that it does not exist on the tracer */
1284 assert(ret != -EEXIST);
1285 goto error;
1286 }
1287
1288 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1289
1290 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1291 app->pid);
1292
1293 end:
1294 return ret;
1295
1296 error:
1297 /* Valid. Calling here is already in a read side lock */
1298 delete_ust_app_event(-1, ua_event);
1299 return ret;
1300 }
1301
1302 /*
1303 * Create UST metadata and open it on the tracer side.
1304 */
1305 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1306 char *pathname, struct ust_app *app)
1307 {
1308 int ret = 0;
1309
1310 if (ua_sess->metadata == NULL) {
1311 /* Allocate UST metadata */
1312 ua_sess->metadata = trace_ust_create_metadata(pathname);
1313 if (ua_sess->metadata == NULL) {
1314 /* malloc() failed */
1315 goto error;
1316 }
1317
1318 ret = open_ust_metadata(app, ua_sess);
1319 if (ret < 0) {
1320 DBG3("Opening metadata failed. Cleaning up memory");
1321
1322 /* Cleanup failed metadata struct */
1323 free(ua_sess->metadata);
1324 /*
1325 * This is very important because delete_ust_app_session check if
1326 * the pointer is null or not in order to delete the metadata.
1327 */
1328 ua_sess->metadata = NULL;
1329 goto error;
1330 }
1331
1332 DBG2("UST metadata opened for app pid %d", app->pid);
1333 }
1334
1335 /* Open UST metadata stream */
1336 if (ua_sess->metadata->stream_obj == NULL) {
1337 ret = create_ust_stream(app, ua_sess);
1338 if (ret < 0) {
1339 goto error;
1340 }
1341
1342 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1343 "%s/metadata", ua_sess->path);
1344 if (ret < 0) {
1345 PERROR("asprintf UST create stream");
1346 goto error;
1347 }
1348
1349 DBG2("UST metadata stream object created for app pid %d",
1350 app->pid);
1351 } else {
1352 ERR("Attempting to create stream without metadata opened");
1353 goto error;
1354 }
1355
1356 return 0;
1357
1358 error:
1359 return -1;
1360 }
1361
1362 /*
1363 * Return pointer to traceable apps list.
1364 */
1365 struct lttng_ht *ust_app_get_ht(void)
1366 {
1367 return ust_app_ht;
1368 }
1369
1370 /*
1371 * Return ust app pointer or NULL if not found.
1372 */
1373 struct ust_app *ust_app_find_by_pid(pid_t pid)
1374 {
1375 struct lttng_ht_node_ulong *node;
1376 struct lttng_ht_iter iter;
1377
1378 rcu_read_lock();
1379 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1380 node = lttng_ht_iter_get_node_ulong(&iter);
1381 if (node == NULL) {
1382 DBG2("UST app no found with pid %d", pid);
1383 goto error;
1384 }
1385 rcu_read_unlock();
1386
1387 DBG2("Found UST app by pid %d", pid);
1388
1389 return caa_container_of(node, struct ust_app, pid_n);
1390
1391 error:
1392 rcu_read_unlock();
1393 return NULL;
1394 }
1395
1396 /*
1397 * Using pid and uid (of the app), allocate a new ust_app struct and
1398 * add it to the global traceable app list.
1399 *
1400 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1401 * bitness is not supported.
1402 */
1403 int ust_app_register(struct ust_register_msg *msg, int sock)
1404 {
1405 struct ust_app *lta;
1406 int ret;
1407
1408 if ((msg->bits_per_long == 64 &&
1409 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1410 || (msg->bits_per_long == 32 &&
1411 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
1412 ERR("Registration failed: application \"%s\" (pid: %d) has "
1413 "%d-bit long, but no consumerd for this long size is available.\n",
1414 msg->name, msg->pid, msg->bits_per_long);
1415 ret = close(sock);
1416 if (ret) {
1417 PERROR("close");
1418 }
1419 lttng_fd_put(LTTNG_FD_APPS, 1);
1420 return -EINVAL;
1421 }
1422 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1423 ERR("Registration failed: application \"%s\" (pid: %d) has "
1424 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1425 msg->name, msg->pid, msg->major, msg->minor);
1426 ret = close(sock);
1427 if (ret) {
1428 PERROR("close");
1429 }
1430 lttng_fd_put(LTTNG_FD_APPS, 1);
1431 return -EINVAL;
1432 }
1433 lta = zmalloc(sizeof(struct ust_app));
1434 if (lta == NULL) {
1435 PERROR("malloc");
1436 return -ENOMEM;
1437 }
1438
1439 lta->ppid = msg->ppid;
1440 lta->uid = msg->uid;
1441 lta->gid = msg->gid;
1442 lta->compatible = 0; /* Not compatible until proven */
1443 lta->bits_per_long = msg->bits_per_long;
1444 lta->v_major = msg->major;
1445 lta->v_minor = msg->minor;
1446 strncpy(lta->name, msg->name, sizeof(lta->name));
1447 lta->name[16] = '\0';
1448 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1449
1450 lta->pid = msg->pid;
1451 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1452 lta->sock = sock;
1453 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
1454
1455 rcu_read_lock();
1456
1457 /*
1458 * On a re-registration, we want to kick out the previous registration of
1459 * that pid
1460 */
1461 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1462
1463 /*
1464 * The socket _should_ be unique until _we_ call close. So, a add_unique
1465 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1466 * already in the table.
1467 */
1468 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1469
1470 rcu_read_unlock();
1471
1472 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1473 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1474 lta->sock, lta->name, lta->v_major, lta->v_minor);
1475
1476 return 0;
1477 }
1478
1479 /*
1480 * Unregister app by removing it from the global traceable app list and freeing
1481 * the data struct.
1482 *
1483 * The socket is already closed at this point so no close to sock.
1484 */
1485 void ust_app_unregister(int sock)
1486 {
1487 struct ust_app *lta;
1488 struct lttng_ht_node_ulong *node;
1489 struct lttng_ht_iter iter;
1490 int ret;
1491
1492 rcu_read_lock();
1493
1494 /* Get the node reference for a call_rcu */
1495 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
1496 node = lttng_ht_iter_get_node_ulong(&iter);
1497 if (node == NULL) {
1498 ERR("Unable to find app by sock %d", sock);
1499 goto error;
1500 }
1501
1502 lta = caa_container_of(node, struct ust_app, sock_n);
1503
1504 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1505
1506 /* Remove application from PID hash table */
1507 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1508 assert(!ret);
1509
1510 /* Assign second node for deletion */
1511 iter.iter.node = &lta->pid_n.node;
1512
1513 ret = lttng_ht_del(ust_app_ht, &iter);
1514 assert(!ret);
1515
1516 /* Free memory */
1517 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1518
1519 error:
1520 rcu_read_unlock();
1521 return;
1522 }
1523
1524 /*
1525 * Return traceable_app_count
1526 */
1527 unsigned long ust_app_list_count(void)
1528 {
1529 unsigned long count;
1530
1531 rcu_read_lock();
1532 count = lttng_ht_get_count(ust_app_ht);
1533 rcu_read_unlock();
1534
1535 return count;
1536 }
1537
1538 /*
1539 * Fill events array with all events name of all registered apps.
1540 */
1541 int ust_app_list_events(struct lttng_event **events)
1542 {
1543 int ret, handle;
1544 size_t nbmem, count = 0;
1545 struct lttng_ht_iter iter;
1546 struct ust_app *app;
1547 struct lttng_event *tmp;
1548
1549 nbmem = UST_APP_EVENT_LIST_SIZE;
1550 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1551 if (tmp == NULL) {
1552 PERROR("zmalloc ust app events");
1553 ret = -ENOMEM;
1554 goto error;
1555 }
1556
1557 rcu_read_lock();
1558
1559 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1560 struct lttng_ust_tracepoint_iter uiter;
1561
1562 health_code_update(&health_thread_cmd);
1563
1564 if (!app->compatible) {
1565 /*
1566 * TODO: In time, we should notice the caller of this error by
1567 * telling him that this is a version error.
1568 */
1569 continue;
1570 }
1571 handle = ustctl_tracepoint_list(app->sock);
1572 if (handle < 0) {
1573 ERR("UST app list events getting handle failed for app pid %d",
1574 app->pid);
1575 continue;
1576 }
1577
1578 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
1579 &uiter)) != -ENOENT) {
1580 health_code_update(&health_thread_cmd);
1581 if (count >= nbmem) {
1582 /* In case the realloc fails, we free the memory */
1583 void *tmp_ptr = (void *) tmp;
1584 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1585 2 * nbmem);
1586 nbmem *= 2;
1587 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1588 if (tmp == NULL) {
1589 PERROR("realloc ust app events");
1590 free(tmp_ptr);
1591 ret = -ENOMEM;
1592 goto rcu_error;
1593 }
1594 }
1595 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1596 tmp[count].loglevel = uiter.loglevel;
1597 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1598 tmp[count].pid = app->pid;
1599 tmp[count].enabled = -1;
1600 count++;
1601 }
1602 }
1603
1604 ret = count;
1605 *events = tmp;
1606
1607 DBG2("UST app list events done (%zu events)", count);
1608
1609 rcu_error:
1610 rcu_read_unlock();
1611 error:
1612 health_code_update(&health_thread_cmd);
1613 return ret;
1614 }
1615
1616 /*
1617 * Fill events array with all events name of all registered apps.
1618 */
1619 int ust_app_list_event_fields(struct lttng_event_field **fields)
1620 {
1621 int ret, handle;
1622 size_t nbmem, count = 0;
1623 struct lttng_ht_iter iter;
1624 struct ust_app *app;
1625 struct lttng_event_field *tmp;
1626
1627 nbmem = UST_APP_EVENT_LIST_SIZE;
1628 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1629 if (tmp == NULL) {
1630 PERROR("zmalloc ust app event fields");
1631 ret = -ENOMEM;
1632 goto error;
1633 }
1634
1635 rcu_read_lock();
1636
1637 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1638 struct lttng_ust_field_iter uiter;
1639
1640 health_code_update(&health_thread_cmd);
1641
1642 if (!app->compatible) {
1643 /*
1644 * TODO: In time, we should notice the caller of this error by
1645 * telling him that this is a version error.
1646 */
1647 continue;
1648 }
1649 handle = ustctl_tracepoint_field_list(app->sock);
1650 if (handle < 0) {
1651 ERR("UST app list event fields getting handle failed for app pid %d",
1652 app->pid);
1653 continue;
1654 }
1655
1656 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1657 &uiter)) != -ENOENT) {
1658 health_code_update(&health_thread_cmd);
1659 if (count >= nbmem) {
1660 /* In case the realloc fails, we free the memory */
1661 void *tmp_ptr = (void *) tmp;
1662 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1663 2 * nbmem);
1664 nbmem *= 2;
1665 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1666 if (tmp == NULL) {
1667 PERROR("realloc ust app event fields");
1668 free(tmp_ptr);
1669 ret = -ENOMEM;
1670 goto rcu_error;
1671 }
1672 }
1673
1674 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1675 tmp[count].type = uiter.type;
1676 tmp[count].nowrite = uiter.nowrite;
1677
1678 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1679 tmp[count].event.loglevel = uiter.loglevel;
1680 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1681 tmp[count].event.pid = app->pid;
1682 tmp[count].event.enabled = -1;
1683 count++;
1684 }
1685 }
1686
1687 ret = count;
1688 *fields = tmp;
1689
1690 DBG2("UST app list event fields done (%zu events)", count);
1691
1692 rcu_error:
1693 rcu_read_unlock();
1694 error:
1695 health_code_update(&health_thread_cmd);
1696 return ret;
1697 }
1698
1699 /*
1700 * Free and clean all traceable apps of the global list.
1701 */
1702 void ust_app_clean_list(void)
1703 {
1704 int ret;
1705 struct ust_app *app;
1706 struct lttng_ht_iter iter;
1707
1708 DBG2("UST app cleaning registered apps hash table");
1709
1710 rcu_read_lock();
1711
1712 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1713 ret = lttng_ht_del(ust_app_ht, &iter);
1714 assert(!ret);
1715 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
1716 }
1717
1718 /* Cleanup socket hash table */
1719 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1720 sock_n.node) {
1721 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1722 assert(!ret);
1723 }
1724
1725 /* Destroy is done only when the ht is empty */
1726 lttng_ht_destroy(ust_app_ht);
1727 lttng_ht_destroy(ust_app_ht_by_sock);
1728
1729 rcu_read_unlock();
1730 }
1731
1732 /*
1733 * Init UST app hash table.
1734 */
1735 void ust_app_ht_alloc(void)
1736 {
1737 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1738 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1739 }
1740
1741 /*
1742 * For a specific UST session, disable the channel for all registered apps.
1743 */
1744 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1745 struct ltt_ust_channel *uchan)
1746 {
1747 int ret = 0;
1748 struct lttng_ht_iter iter;
1749 struct lttng_ht_node_str *ua_chan_node;
1750 struct ust_app *app;
1751 struct ust_app_session *ua_sess;
1752 struct ust_app_channel *ua_chan;
1753
1754 if (usess == NULL || uchan == NULL) {
1755 ERR("Disabling UST global channel with NULL values");
1756 ret = -1;
1757 goto error;
1758 }
1759
1760 DBG2("UST app disabling channel %s from global domain for session id %d",
1761 uchan->name, usess->id);
1762
1763 rcu_read_lock();
1764
1765 /* For every registered applications */
1766 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1767 struct lttng_ht_iter uiter;
1768 if (!app->compatible) {
1769 /*
1770 * TODO: In time, we should notice the caller of this error by
1771 * telling him that this is a version error.
1772 */
1773 continue;
1774 }
1775 ua_sess = lookup_session_by_app(usess, app);
1776 if (ua_sess == NULL) {
1777 continue;
1778 }
1779
1780 /* Get channel */
1781 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1782 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1783 /* If the session if found for the app, the channel must be there */
1784 assert(ua_chan_node);
1785
1786 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1787 /* The channel must not be already disabled */
1788 assert(ua_chan->enabled == 1);
1789
1790 /* Disable channel onto application */
1791 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1792 if (ret < 0) {
1793 /* XXX: We might want to report this error at some point... */
1794 continue;
1795 }
1796 }
1797
1798 rcu_read_unlock();
1799
1800 error:
1801 return ret;
1802 }
1803
1804 /*
1805 * For a specific UST session, enable the channel for all registered apps.
1806 */
1807 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1808 struct ltt_ust_channel *uchan)
1809 {
1810 int ret = 0;
1811 struct lttng_ht_iter iter;
1812 struct ust_app *app;
1813 struct ust_app_session *ua_sess;
1814
1815 if (usess == NULL || uchan == NULL) {
1816 ERR("Adding UST global channel to NULL values");
1817 ret = -1;
1818 goto error;
1819 }
1820
1821 DBG2("UST app enabling channel %s to global domain for session id %d",
1822 uchan->name, usess->id);
1823
1824 rcu_read_lock();
1825
1826 /* For every registered applications */
1827 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1828 if (!app->compatible) {
1829 /*
1830 * TODO: In time, we should notice the caller of this error by
1831 * telling him that this is a version error.
1832 */
1833 continue;
1834 }
1835 ua_sess = lookup_session_by_app(usess, app);
1836 if (ua_sess == NULL) {
1837 continue;
1838 }
1839
1840 /* Enable channel onto application */
1841 ret = enable_ust_app_channel(ua_sess, uchan, app);
1842 if (ret < 0) {
1843 /* XXX: We might want to report this error at some point... */
1844 continue;
1845 }
1846 }
1847
1848 rcu_read_unlock();
1849
1850 error:
1851 return ret;
1852 }
1853
1854 /*
1855 * Disable an event in a channel and for a specific session.
1856 */
1857 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1858 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1859 {
1860 int ret = 0;
1861 struct lttng_ht_iter iter, uiter;
1862 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1863 struct ust_app *app;
1864 struct ust_app_session *ua_sess;
1865 struct ust_app_channel *ua_chan;
1866 struct ust_app_event *ua_event;
1867
1868 DBG("UST app disabling event %s for all apps in channel "
1869 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1870
1871 rcu_read_lock();
1872
1873 /* For all registered applications */
1874 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1875 if (!app->compatible) {
1876 /*
1877 * TODO: In time, we should notice the caller of this error by
1878 * telling him that this is a version error.
1879 */
1880 continue;
1881 }
1882 ua_sess = lookup_session_by_app(usess, app);
1883 if (ua_sess == NULL) {
1884 /* Next app */
1885 continue;
1886 }
1887
1888 /* Lookup channel in the ust app session */
1889 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1890 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1891 if (ua_chan_node == NULL) {
1892 DBG2("Channel %s not found in session id %d for app pid %d."
1893 "Skipping", uchan->name, usess->id, app->pid);
1894 continue;
1895 }
1896 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1897
1898 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1899 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1900 if (ua_event_node == NULL) {
1901 DBG2("Event %s not found in channel %s for app pid %d."
1902 "Skipping", uevent->attr.name, uchan->name, app->pid);
1903 continue;
1904 }
1905 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1906
1907 ret = disable_ust_app_event(ua_sess, ua_event, app);
1908 if (ret < 0) {
1909 /* XXX: Report error someday... */
1910 continue;
1911 }
1912 }
1913
1914 rcu_read_unlock();
1915
1916 return ret;
1917 }
1918
1919 /*
1920 * For a specific UST session and UST channel, the event for all
1921 * registered apps.
1922 */
1923 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1924 struct ltt_ust_channel *uchan)
1925 {
1926 int ret = 0;
1927 struct lttng_ht_iter iter, uiter;
1928 struct lttng_ht_node_str *ua_chan_node;
1929 struct ust_app *app;
1930 struct ust_app_session *ua_sess;
1931 struct ust_app_channel *ua_chan;
1932 struct ust_app_event *ua_event;
1933
1934 DBG("UST app disabling all event for all apps in channel "
1935 "%s for session id %d", uchan->name, usess->id);
1936
1937 rcu_read_lock();
1938
1939 /* For all registered applications */
1940 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1941 if (!app->compatible) {
1942 /*
1943 * TODO: In time, we should notice the caller of this error by
1944 * telling him that this is a version error.
1945 */
1946 continue;
1947 }
1948 ua_sess = lookup_session_by_app(usess, app);
1949 /* If ua_sess is NULL, there is a code flow error */
1950 assert(ua_sess);
1951
1952 /* Lookup channel in the ust app session */
1953 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1954 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1955 /* If the channel is not found, there is a code flow error */
1956 assert(ua_chan_node);
1957
1958 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1959
1960 /* Disable each events of channel */
1961 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1962 node.node) {
1963 ret = disable_ust_app_event(ua_sess, ua_event, app);
1964 if (ret < 0) {
1965 /* XXX: Report error someday... */
1966 continue;
1967 }
1968 }
1969 }
1970
1971 rcu_read_unlock();
1972
1973 return ret;
1974 }
1975
1976 /*
1977 * For a specific UST session, create the channel for all registered apps.
1978 */
1979 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1980 struct ltt_ust_channel *uchan)
1981 {
1982 struct lttng_ht_iter iter;
1983 struct ust_app *app;
1984 struct ust_app_session *ua_sess;
1985 struct ust_app_channel *ua_chan;
1986
1987 /* Very wrong code flow */
1988 assert(usess);
1989 assert(uchan);
1990
1991 DBG2("UST app adding channel %s to global domain for session id %d",
1992 uchan->name, usess->id);
1993
1994 rcu_read_lock();
1995
1996 /* For every registered applications */
1997 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1998 if (!app->compatible) {
1999 /*
2000 * TODO: In time, we should notice the caller of this error by
2001 * telling him that this is a version error.
2002 */
2003 continue;
2004 }
2005 /*
2006 * Create session on the tracer side and add it to app session HT. Note
2007 * that if session exist, it will simply return a pointer to the ust
2008 * app session.
2009 */
2010 ua_sess = create_ust_app_session(usess, app);
2011 if (ua_sess == NULL) {
2012 /* The malloc() failed. */
2013 goto error;
2014 } else if (ua_sess == (void *) -1UL) {
2015 /* The application's socket is not valid. Contiuing */
2016 continue;
2017 }
2018
2019 /* Create channel onto application */
2020 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2021 if (ua_chan == NULL) {
2022 /* Major problem here and it's maybe the tracer or malloc() */
2023 goto error;
2024 }
2025 }
2026
2027 rcu_read_unlock();
2028
2029 return 0;
2030
2031 error:
2032 return -1;
2033 }
2034
2035 /*
2036 * Enable event for a specific session and channel on the tracer.
2037 */
2038 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
2039 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2040 {
2041 int ret = 0;
2042 struct lttng_ht_iter iter, uiter;
2043 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2044 struct ust_app *app;
2045 struct ust_app_session *ua_sess;
2046 struct ust_app_channel *ua_chan;
2047 struct ust_app_event *ua_event;
2048
2049 DBG("UST app enabling event %s for all apps for session id %d",
2050 uevent->attr.name, usess->id);
2051
2052 /*
2053 * NOTE: At this point, this function is called only if the session and
2054 * channel passed are already created for all apps. and enabled on the
2055 * tracer also.
2056 */
2057
2058 rcu_read_lock();
2059
2060 /* For all registered applications */
2061 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2062 if (!app->compatible) {
2063 /*
2064 * TODO: In time, we should notice the caller of this error by
2065 * telling him that this is a version error.
2066 */
2067 continue;
2068 }
2069 ua_sess = lookup_session_by_app(usess, app);
2070 /* If ua_sess is NULL, there is a code flow error */
2071 assert(ua_sess);
2072
2073 /* Lookup channel in the ust app session */
2074 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2075 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2076 /* If the channel is not found, there is a code flow error */
2077 assert(ua_chan_node);
2078
2079 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2080
2081 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2082 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2083 if (ua_event_node == NULL) {
2084 DBG3("UST app enable event %s not found for app PID %d."
2085 "Skipping app", uevent->attr.name, app->pid);
2086 continue;
2087 }
2088 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2089
2090 ret = enable_ust_app_event(ua_sess, ua_event, app);
2091 if (ret < 0) {
2092 goto error;
2093 }
2094 }
2095
2096 error:
2097 rcu_read_unlock();
2098 return ret;
2099 }
2100
2101 /*
2102 * For a specific existing UST session and UST channel, creates the event for
2103 * all registered apps.
2104 */
2105 int ust_app_create_event_glb(struct ltt_ust_session *usess,
2106 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2107 {
2108 int ret = 0;
2109 struct lttng_ht_iter iter, uiter;
2110 struct lttng_ht_node_str *ua_chan_node;
2111 struct ust_app *app;
2112 struct ust_app_session *ua_sess;
2113 struct ust_app_channel *ua_chan;
2114
2115 DBG("UST app creating event %s for all apps for session id %d",
2116 uevent->attr.name, usess->id);
2117
2118 rcu_read_lock();
2119
2120 /* For all registered applications */
2121 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2122 if (!app->compatible) {
2123 /*
2124 * TODO: In time, we should notice the caller of this error by
2125 * telling him that this is a version error.
2126 */
2127 continue;
2128 }
2129 ua_sess = lookup_session_by_app(usess, app);
2130 /* If ua_sess is NULL, there is a code flow error */
2131 assert(ua_sess);
2132
2133 /* Lookup channel in the ust app session */
2134 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2135 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2136 /* If the channel is not found, there is a code flow error */
2137 assert(ua_chan_node);
2138
2139 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2140
2141 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2142 if (ret < 0) {
2143 if (ret != -EEXIST) {
2144 /* Possible value at this point: -ENOMEM. If so, we stop! */
2145 break;
2146 }
2147 DBG2("UST app event %s already exist on app PID %d",
2148 uevent->attr.name, app->pid);
2149 continue;
2150 }
2151 }
2152
2153 rcu_read_unlock();
2154
2155 return ret;
2156 }
2157
2158 /*
2159 * Start tracing for a specific UST session and app.
2160 */
2161 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
2162 {
2163 int ret = 0;
2164 struct lttng_ht_iter iter;
2165 struct ust_app_session *ua_sess;
2166 struct ust_app_channel *ua_chan;
2167 struct ltt_ust_stream *ustream;
2168 struct consumer_socket *socket;
2169
2170 DBG("Starting tracing for ust app pid %d", app->pid);
2171
2172 rcu_read_lock();
2173
2174 if (!app->compatible) {
2175 goto end;
2176 }
2177
2178 ua_sess = lookup_session_by_app(usess, app);
2179 if (ua_sess == NULL) {
2180 goto error_rcu_unlock;
2181 }
2182
2183 /* Upon restart, we skip the setup, already done */
2184 if (ua_sess->started) {
2185 goto skip_setup;
2186 }
2187
2188 /* Create directories if consumer is LOCAL and has a path defined. */
2189 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2190 strlen(usess->consumer->dst.trace_path) > 0) {
2191 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2192 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2193 if (ret < 0) {
2194 if (ret != -EEXIST) {
2195 ERR("Trace directory creation error");
2196 ret = -1;
2197 goto error_rcu_unlock;
2198 }
2199 }
2200 }
2201
2202 /* Indicate that the session has been started once */
2203 ua_sess->started = 1;
2204
2205 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2206 if (ret < 0) {
2207 ret = LTTNG_ERR_UST_META_FAIL;
2208 goto error_rcu_unlock;
2209 }
2210
2211 /* For each channel */
2212 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2213 node.node) {
2214 /* Create all streams */
2215 while (1) {
2216 /* Create UST stream */
2217 ustream = zmalloc(sizeof(*ustream));
2218 if (ustream == NULL) {
2219 PERROR("zmalloc ust stream");
2220 goto error_rcu_unlock;
2221 }
2222
2223 /* We are going to receive 2 fds, we need to reserve them. */
2224 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2225 if (ret < 0) {
2226 ERR("Exhausted number of available FD upon stream create");
2227 free(ustream);
2228 goto error_rcu_unlock;
2229 }
2230
2231 health_code_update(&health_thread_cmd);
2232
2233 ret = ustctl_create_stream(app->sock, ua_chan->obj,
2234 &ustream->obj);
2235 if (ret < 0) {
2236 /* Got all streams */
2237 lttng_fd_put(LTTNG_FD_APPS, 2);
2238 free(ustream);
2239 ret = LTTNG_ERR_UST_STREAM_FAIL;
2240 break;
2241 }
2242 ustream->handle = ustream->obj->handle;
2243
2244 health_code_update(&health_thread_cmd);
2245
2246 /* Order is important */
2247 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
2248 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2249 ua_chan->name, ua_chan->streams.count);
2250 ua_chan->streams.count++;
2251 if (ret < 0) {
2252 PERROR("asprintf UST create stream");
2253 /*
2254 * XXX what should we do here with the
2255 * stream ?
2256 */
2257 continue;
2258 }
2259 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2260 ustream->handle);
2261 }
2262
2263 health_code_update(&health_thread_cmd);
2264 }
2265
2266 switch (app->bits_per_long) {
2267 case 64:
2268 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2269 usess->consumer);
2270 if (socket == NULL) {
2271 goto skip_setup;
2272 }
2273 break;
2274 case 32:
2275 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2276 usess->consumer);
2277 if (socket == NULL) {
2278 goto skip_setup;
2279 }
2280 break;
2281 default:
2282 ret = -EINVAL;
2283 goto error_rcu_unlock;
2284 }
2285
2286 /* Setup UST consumer socket and send fds to it */
2287 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
2288 if (ret < 0) {
2289 goto error_rcu_unlock;
2290 }
2291
2292 health_code_update(&health_thread_cmd);
2293
2294 skip_setup:
2295 /* This start the UST tracing */
2296 ret = ustctl_start_session(app->sock, ua_sess->handle);
2297 if (ret < 0) {
2298 ERR("Error starting tracing for app pid: %d", app->pid);
2299 goto error_rcu_unlock;
2300 }
2301
2302 health_code_update(&health_thread_cmd);
2303
2304 /* Quiescent wait after starting trace */
2305 ustctl_wait_quiescent(app->sock);
2306
2307 end:
2308 rcu_read_unlock();
2309 health_code_update(&health_thread_cmd);
2310 return 0;
2311
2312 error_rcu_unlock:
2313 rcu_read_unlock();
2314 health_code_update(&health_thread_cmd);
2315 return -1;
2316 }
2317
2318 /*
2319 * Stop tracing for a specific UST session and app.
2320 */
2321 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2322 {
2323 int ret = 0;
2324 struct lttng_ht_iter iter;
2325 struct ust_app_session *ua_sess;
2326 struct ust_app_channel *ua_chan;
2327
2328 DBG("Stopping tracing for ust app pid %d", app->pid);
2329
2330 rcu_read_lock();
2331
2332 if (!app->compatible) {
2333 goto end;
2334 }
2335
2336 ua_sess = lookup_session_by_app(usess, app);
2337 if (ua_sess == NULL) {
2338 /* Only malloc can failed so something is really wrong */
2339 goto error_rcu_unlock;
2340 }
2341
2342 /*
2343 * If started = 0, it means that stop trace has been called for a session
2344 * that was never started. This is a code flow error and should never
2345 * happen.
2346 */
2347 assert(ua_sess->started == 1);
2348
2349 health_code_update(&health_thread_cmd);
2350
2351 /* This inhibits UST tracing */
2352 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2353 if (ret < 0) {
2354 ERR("Error stopping tracing for app pid: %d", app->pid);
2355 goto error_rcu_unlock;
2356 }
2357
2358 health_code_update(&health_thread_cmd);
2359
2360 /* Quiescent wait after stopping trace */
2361 ustctl_wait_quiescent(app->sock);
2362
2363 health_code_update(&health_thread_cmd);
2364
2365 /* Flushing buffers */
2366 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2367 node.node) {
2368 health_code_update(&health_thread_cmd);
2369 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2370 if (ret < 0) {
2371 ERR("UST app PID %d channel %s flush failed with ret %d",
2372 app->pid, ua_chan->name, ret);
2373 /* Continuing flushing all buffers */
2374 continue;
2375 }
2376 }
2377
2378 health_code_update(&health_thread_cmd);
2379
2380 /* Flush all buffers before stopping */
2381 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2382 if (ret < 0) {
2383 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2384 ret);
2385 }
2386
2387 end:
2388 rcu_read_unlock();
2389 health_code_update(&health_thread_cmd);
2390 return 0;
2391
2392 error_rcu_unlock:
2393 rcu_read_unlock();
2394 health_code_update(&health_thread_cmd);
2395 return -1;
2396 }
2397
2398 /*
2399 * Destroy a specific UST session in apps.
2400 */
2401 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2402 {
2403 struct ust_app_session *ua_sess;
2404 struct lttng_ust_object_data obj;
2405 struct lttng_ht_iter iter;
2406 struct lttng_ht_node_ulong *node;
2407 int ret;
2408
2409 DBG("Destroy tracing for ust app pid %d", app->pid);
2410
2411 rcu_read_lock();
2412
2413 if (!app->compatible) {
2414 goto end;
2415 }
2416
2417 __lookup_session_by_app(usess, app, &iter);
2418 node = lttng_ht_iter_get_node_ulong(&iter);
2419 if (node == NULL) {
2420 /* Only malloc can failed so something is really wrong */
2421 goto error_rcu_unlock;
2422 }
2423 ua_sess = caa_container_of(node, struct ust_app_session, node);
2424 ret = lttng_ht_del(app->sessions, &iter);
2425 assert(!ret);
2426 obj.handle = ua_sess->handle;
2427 obj.shm_fd = -1;
2428 obj.wait_fd = -1;
2429 obj.memory_map_size = 0;
2430 health_code_update(&health_thread_cmd);
2431 ustctl_release_object(app->sock, &obj);
2432
2433 health_code_update(&health_thread_cmd);
2434 delete_ust_app_session(app->sock, ua_sess);
2435
2436 /* Quiescent wait after stopping trace */
2437 ustctl_wait_quiescent(app->sock);
2438
2439 end:
2440 rcu_read_unlock();
2441 health_code_update(&health_thread_cmd);
2442 return 0;
2443
2444 error_rcu_unlock:
2445 rcu_read_unlock();
2446 health_code_update(&health_thread_cmd);
2447 return -1;
2448 }
2449
2450 /*
2451 * Start tracing for the UST session.
2452 */
2453 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2454 {
2455 int ret = 0;
2456 struct lttng_ht_iter iter;
2457 struct ust_app *app;
2458
2459 DBG("Starting all UST traces");
2460
2461 rcu_read_lock();
2462
2463 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2464 ret = ust_app_start_trace(usess, app);
2465 if (ret < 0) {
2466 /* Continue to next apps even on error */
2467 continue;
2468 }
2469 }
2470
2471 rcu_read_unlock();
2472
2473 return 0;
2474 }
2475
2476 /*
2477 * Start tracing for the UST session.
2478 */
2479 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2480 {
2481 int ret = 0;
2482 struct lttng_ht_iter iter;
2483 struct ust_app *app;
2484
2485 DBG("Stopping all UST traces");
2486
2487 rcu_read_lock();
2488
2489 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2490 ret = ust_app_stop_trace(usess, app);
2491 if (ret < 0) {
2492 /* Continue to next apps even on error */
2493 continue;
2494 }
2495 }
2496
2497 rcu_read_unlock();
2498
2499 return 0;
2500 }
2501
2502 /*
2503 * Destroy app UST session.
2504 */
2505 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2506 {
2507 int ret = 0;
2508 struct lttng_ht_iter iter;
2509 struct ust_app *app;
2510
2511 DBG("Destroy all UST traces");
2512
2513 rcu_read_lock();
2514
2515 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2516 ret = ust_app_destroy_trace(usess, app);
2517 if (ret < 0) {
2518 /* Continue to next apps even on error */
2519 continue;
2520 }
2521 }
2522
2523 rcu_read_unlock();
2524
2525 return 0;
2526 }
2527
2528 /*
2529 * Add channels/events from UST global domain to registered apps at sock.
2530 */
2531 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2532 {
2533 int ret = 0;
2534 struct lttng_ht_iter iter, uiter, iter_ctx;
2535 struct ust_app *app;
2536 struct ust_app_session *ua_sess;
2537 struct ust_app_channel *ua_chan;
2538 struct ust_app_event *ua_event;
2539 struct ust_app_ctx *ua_ctx;
2540
2541 if (usess == NULL) {
2542 ERR("No UST session on global update. Returning");
2543 goto error;
2544 }
2545
2546 DBG2("UST app global update for app sock %d for session id %d", sock,
2547 usess->id);
2548
2549 rcu_read_lock();
2550
2551 app = find_app_by_sock(sock);
2552 if (app == NULL) {
2553 ERR("Failed to update app sock %d", sock);
2554 goto error;
2555 }
2556
2557 if (!app->compatible) {
2558 goto error;
2559 }
2560
2561 ua_sess = create_ust_app_session(usess, app);
2562 if (ua_sess == NULL) {
2563 goto error;
2564 }
2565
2566 /*
2567 * We can iterate safely here over all UST app session sicne the create ust
2568 * app session above made a shadow copy of the UST global domain from the
2569 * ltt ust session.
2570 */
2571 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2572 node.node) {
2573 ret = create_ust_channel(app, ua_sess, ua_chan);
2574 if (ret < 0) {
2575 /* FIXME: Should we quit here or continue... */
2576 continue;
2577 }
2578
2579 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2580 node.node) {
2581 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2582 if (ret < 0) {
2583 /* FIXME: Should we quit here or continue... */
2584 continue;
2585 }
2586 }
2587
2588
2589 /* For each events */
2590 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2591 node.node) {
2592 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2593 if (ret < 0) {
2594 /* FIXME: Should we quit here or continue... */
2595 continue;
2596 }
2597
2598 /* Add context on events. */
2599 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2600 ua_ctx, node.node) {
2601 ret = create_ust_event_context(ua_event, ua_ctx, app);
2602 if (ret < 0) {
2603 /* FIXME: Should we quit here or continue... */
2604 continue;
2605 }
2606 }
2607 ret = set_ust_event_filter(ua_event, app);
2608 if (ret < 0) {
2609 /* FIXME: Should we quit here or continue... */
2610 continue;
2611 }
2612 }
2613 }
2614
2615 if (usess->start_trace) {
2616 ret = ust_app_start_trace(usess, app);
2617 if (ret < 0) {
2618 goto error;
2619 }
2620
2621 DBG2("UST trace started for app pid %d", app->pid);
2622 }
2623
2624 error:
2625 rcu_read_unlock();
2626 return;
2627 }
2628
2629 /*
2630 * Add context to a specific channel for global UST domain.
2631 */
2632 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2633 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2634 {
2635 int ret = 0;
2636 struct lttng_ht_node_str *ua_chan_node;
2637 struct lttng_ht_iter iter, uiter;
2638 struct ust_app_channel *ua_chan = NULL;
2639 struct ust_app_session *ua_sess;
2640 struct ust_app *app;
2641
2642 rcu_read_lock();
2643
2644 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2645 if (!app->compatible) {
2646 /*
2647 * TODO: In time, we should notice the caller of this error by
2648 * telling him that this is a version error.
2649 */
2650 continue;
2651 }
2652 ua_sess = lookup_session_by_app(usess, app);
2653 if (ua_sess == NULL) {
2654 continue;
2655 }
2656
2657 /* Lookup channel in the ust app session */
2658 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2659 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2660 if (ua_chan_node == NULL) {
2661 continue;
2662 }
2663 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2664 node);
2665
2666 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2667 if (ret < 0) {
2668 continue;
2669 }
2670 }
2671
2672 rcu_read_unlock();
2673 return ret;
2674 }
2675
2676 /*
2677 * Add context to a specific event in a channel for global UST domain.
2678 */
2679 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2680 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2681 struct ltt_ust_context *uctx)
2682 {
2683 int ret = 0;
2684 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2685 struct lttng_ht_iter iter, uiter;
2686 struct ust_app_session *ua_sess;
2687 struct ust_app_event *ua_event;
2688 struct ust_app_channel *ua_chan = NULL;
2689 struct ust_app *app;
2690
2691 rcu_read_lock();
2692
2693 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2694 if (!app->compatible) {
2695 /*
2696 * TODO: In time, we should notice the caller of this error by
2697 * telling him that this is a version error.
2698 */
2699 continue;
2700 }
2701 ua_sess = lookup_session_by_app(usess, app);
2702 if (ua_sess == NULL) {
2703 continue;
2704 }
2705
2706 /* Lookup channel in the ust app session */
2707 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2708 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2709 if (ua_chan_node == NULL) {
2710 continue;
2711 }
2712 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2713 node);
2714
2715 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2716 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2717 if (ua_event_node == NULL) {
2718 continue;
2719 }
2720 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2721 node);
2722
2723 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2724 if (ret < 0) {
2725 continue;
2726 }
2727 }
2728
2729 rcu_read_unlock();
2730 return ret;
2731 }
2732
2733 /*
2734 * Add context to a specific event in a channel for global UST domain.
2735 */
2736 int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2737 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2738 struct lttng_filter_bytecode *bytecode)
2739 {
2740 int ret = 0;
2741 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2742 struct lttng_ht_iter iter, uiter;
2743 struct ust_app_session *ua_sess;
2744 struct ust_app_event *ua_event;
2745 struct ust_app_channel *ua_chan = NULL;
2746 struct ust_app *app;
2747
2748 rcu_read_lock();
2749
2750 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2751 if (!app->compatible) {
2752 /*
2753 * TODO: In time, we should notice the caller of this error by
2754 * telling him that this is a version error.
2755 */
2756 continue;
2757 }
2758 ua_sess = lookup_session_by_app(usess, app);
2759 if (ua_sess == NULL) {
2760 continue;
2761 }
2762
2763 /* Lookup channel in the ust app session */
2764 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2765 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2766 if (ua_chan_node == NULL) {
2767 continue;
2768 }
2769 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2770 node);
2771
2772 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2773 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2774 if (ua_event_node == NULL) {
2775 continue;
2776 }
2777 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2778 node);
2779
2780 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2781 if (ret < 0) {
2782 continue;
2783 }
2784 }
2785
2786 rcu_read_unlock();
2787 return ret;
2788 }
2789
2790 /*
2791 * Enable event for a channel from a UST session for a specific PID.
2792 */
2793 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2794 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2795 {
2796 int ret = 0;
2797 struct lttng_ht_iter iter;
2798 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2799 struct ust_app *app;
2800 struct ust_app_session *ua_sess;
2801 struct ust_app_channel *ua_chan;
2802 struct ust_app_event *ua_event;
2803
2804 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2805
2806 rcu_read_lock();
2807
2808 app = ust_app_find_by_pid(pid);
2809 if (app == NULL) {
2810 ERR("UST app enable event per PID %d not found", pid);
2811 ret = -1;
2812 goto error;
2813 }
2814
2815 if (!app->compatible) {
2816 ret = 0;
2817 goto error;
2818 }
2819
2820 ua_sess = lookup_session_by_app(usess, app);
2821 /* If ua_sess is NULL, there is a code flow error */
2822 assert(ua_sess);
2823
2824 /* Lookup channel in the ust app session */
2825 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2826 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2827 /* If the channel is not found, there is a code flow error */
2828 assert(ua_chan_node);
2829
2830 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2831
2832 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2833 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2834 if (ua_event_node == NULL) {
2835 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2836 if (ret < 0) {
2837 goto error;
2838 }
2839 } else {
2840 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2841
2842 ret = enable_ust_app_event(ua_sess, ua_event, app);
2843 if (ret < 0) {
2844 goto error;
2845 }
2846 }
2847
2848 error:
2849 rcu_read_unlock();
2850 return ret;
2851 }
2852
2853 /*
2854 * Disable event for a channel from a UST session for a specific PID.
2855 */
2856 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2857 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2858 {
2859 int ret = 0;
2860 struct lttng_ht_iter iter;
2861 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2862 struct ust_app *app;
2863 struct ust_app_session *ua_sess;
2864 struct ust_app_channel *ua_chan;
2865 struct ust_app_event *ua_event;
2866
2867 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2868
2869 rcu_read_lock();
2870
2871 app = ust_app_find_by_pid(pid);
2872 if (app == NULL) {
2873 ERR("UST app disable event per PID %d not found", pid);
2874 ret = -1;
2875 goto error;
2876 }
2877
2878 if (!app->compatible) {
2879 ret = 0;
2880 goto error;
2881 }
2882
2883 ua_sess = lookup_session_by_app(usess, app);
2884 /* If ua_sess is NULL, there is a code flow error */
2885 assert(ua_sess);
2886
2887 /* Lookup channel in the ust app session */
2888 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2889 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2890 if (ua_chan_node == NULL) {
2891 /* Channel does not exist, skip disabling */
2892 goto error;
2893 }
2894 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2895
2896 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2897 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2898 if (ua_event_node == NULL) {
2899 /* Event does not exist, skip disabling */
2900 goto error;
2901 }
2902 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2903
2904 ret = disable_ust_app_event(ua_sess, ua_event, app);
2905 if (ret < 0) {
2906 goto error;
2907 }
2908
2909 error:
2910 rcu_read_unlock();
2911 return ret;
2912 }
2913
2914 /*
2915 * Validate version of UST apps and set the compatible bit.
2916 */
2917 int ust_app_validate_version(int sock)
2918 {
2919 int ret;
2920 struct ust_app *app;
2921
2922 rcu_read_lock();
2923
2924 app = find_app_by_sock(sock);
2925 assert(app);
2926
2927 health_code_update(&health_thread_cmd);
2928
2929 ret = ustctl_tracer_version(sock, &app->version);
2930 if (ret < 0) {
2931 goto error;
2932 }
2933
2934 /* Validate version */
2935 if (app->version.major != UST_APP_MAJOR_VERSION) {
2936 goto error;
2937 }
2938
2939 DBG2("UST app PID %d is compatible with internal major version %d "
2940 "(supporting == %d)", app->pid, app->version.major,
2941 UST_APP_MAJOR_VERSION);
2942 app->compatible = 1;
2943 rcu_read_unlock();
2944 health_code_update(&health_thread_cmd);
2945 return 0;
2946
2947 error:
2948 DBG2("UST app PID %d is not compatible with internal major version %d "
2949 "(supporting == %d)", app->pid, app->version.major,
2950 UST_APP_MAJOR_VERSION);
2951 app->compatible = 0;
2952 rcu_read_unlock();
2953 health_code_update(&health_thread_cmd);
2954 return -1;
2955 }
2956
2957 /*
2958 * Calibrate registered applications.
2959 */
2960 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2961 {
2962 int ret = 0;
2963 struct lttng_ht_iter iter;
2964 struct ust_app *app;
2965
2966 rcu_read_lock();
2967
2968 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2969 if (!app->compatible) {
2970 /*
2971 * TODO: In time, we should notice the caller of this error by
2972 * telling him that this is a version error.
2973 */
2974 continue;
2975 }
2976
2977 health_code_update(&health_thread_cmd);
2978
2979 ret = ustctl_calibrate(app->sock, calibrate);
2980 if (ret < 0) {
2981 switch (ret) {
2982 case -ENOSYS:
2983 /* Means that it's not implemented on the tracer side. */
2984 ret = 0;
2985 break;
2986 default:
2987 /* TODO: Report error to user */
2988 DBG2("Calibrate app PID %d returned with error %d",
2989 app->pid, ret);
2990 break;
2991 }
2992 }
2993 }
2994
2995 DBG("UST app global domain calibration finished");
2996
2997 rcu_read_unlock();
2998
2999 health_code_update(&health_thread_cmd);
3000
3001 return ret;
3002 }
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