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[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 && ust_consumerd64_fd == -EINVAL)
1409 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1410 ERR("Registration failed: application \"%s\" (pid: %d) has "
1411 "%d-bit long, but no consumerd for this long size is available.\n",
1412 msg->name, msg->pid, msg->bits_per_long);
1413 ret = close(sock);
1414 if (ret) {
1415 PERROR("close");
1416 }
1417 lttng_fd_put(LTTNG_FD_APPS, 1);
1418 return -EINVAL;
1419 }
1420 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1421 ERR("Registration failed: application \"%s\" (pid: %d) has "
1422 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1423 msg->name, msg->pid, msg->major, msg->minor);
1424 ret = close(sock);
1425 if (ret) {
1426 PERROR("close");
1427 }
1428 lttng_fd_put(LTTNG_FD_APPS, 1);
1429 return -EINVAL;
1430 }
1431 lta = zmalloc(sizeof(struct ust_app));
1432 if (lta == NULL) {
1433 PERROR("malloc");
1434 return -ENOMEM;
1435 }
1436
1437 lta->ppid = msg->ppid;
1438 lta->uid = msg->uid;
1439 lta->gid = msg->gid;
1440 lta->compatible = 0; /* Not compatible until proven */
1441 lta->bits_per_long = msg->bits_per_long;
1442 lta->v_major = msg->major;
1443 lta->v_minor = msg->minor;
1444 strncpy(lta->name, msg->name, sizeof(lta->name));
1445 lta->name[16] = '\0';
1446 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1447
1448 lta->pid = msg->pid;
1449 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1450 lta->sock = sock;
1451 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
1452
1453 rcu_read_lock();
1454
1455 /*
1456 * On a re-registration, we want to kick out the previous registration of
1457 * that pid
1458 */
1459 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1460
1461 /*
1462 * The socket _should_ be unique until _we_ call close. So, a add_unique
1463 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1464 * already in the table.
1465 */
1466 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1467
1468 rcu_read_unlock();
1469
1470 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1471 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1472 lta->sock, lta->name, lta->v_major, lta->v_minor);
1473
1474 return 0;
1475 }
1476
1477 /*
1478 * Unregister app by removing it from the global traceable app list and freeing
1479 * the data struct.
1480 *
1481 * The socket is already closed at this point so no close to sock.
1482 */
1483 void ust_app_unregister(int sock)
1484 {
1485 struct ust_app *lta;
1486 struct lttng_ht_node_ulong *node;
1487 struct lttng_ht_iter iter;
1488 int ret;
1489
1490 rcu_read_lock();
1491
1492 /* Get the node reference for a call_rcu */
1493 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
1494 node = lttng_ht_iter_get_node_ulong(&iter);
1495 if (node == NULL) {
1496 ERR("Unable to find app by sock %d", sock);
1497 goto error;
1498 }
1499
1500 lta = caa_container_of(node, struct ust_app, sock_n);
1501
1502 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1503
1504 /* Remove application from PID hash table */
1505 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1506 assert(!ret);
1507
1508 /* Assign second node for deletion */
1509 iter.iter.node = &lta->pid_n.node;
1510
1511 ret = lttng_ht_del(ust_app_ht, &iter);
1512 assert(!ret);
1513
1514 /* Free memory */
1515 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1516
1517 error:
1518 rcu_read_unlock();
1519 return;
1520 }
1521
1522 /*
1523 * Return traceable_app_count
1524 */
1525 unsigned long ust_app_list_count(void)
1526 {
1527 unsigned long count;
1528
1529 rcu_read_lock();
1530 count = lttng_ht_get_count(ust_app_ht);
1531 rcu_read_unlock();
1532
1533 return count;
1534 }
1535
1536 /*
1537 * Fill events array with all events name of all registered apps.
1538 */
1539 int ust_app_list_events(struct lttng_event **events)
1540 {
1541 int ret, handle;
1542 size_t nbmem, count = 0;
1543 struct lttng_ht_iter iter;
1544 struct ust_app *app;
1545 struct lttng_event *tmp;
1546
1547 nbmem = UST_APP_EVENT_LIST_SIZE;
1548 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1549 if (tmp == NULL) {
1550 PERROR("zmalloc ust app events");
1551 ret = -ENOMEM;
1552 goto error;
1553 }
1554
1555 rcu_read_lock();
1556
1557 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1558 struct lttng_ust_tracepoint_iter uiter;
1559
1560 health_code_update(&health_thread_cmd);
1561
1562 if (!app->compatible) {
1563 /*
1564 * TODO: In time, we should notice the caller of this error by
1565 * telling him that this is a version error.
1566 */
1567 continue;
1568 }
1569 handle = ustctl_tracepoint_list(app->sock);
1570 if (handle < 0) {
1571 ERR("UST app list events getting handle failed for app pid %d",
1572 app->pid);
1573 continue;
1574 }
1575
1576 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
1577 &uiter)) != -ENOENT) {
1578 health_code_update(&health_thread_cmd);
1579 if (count >= nbmem) {
1580 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1581 2 * nbmem);
1582 nbmem *= 2;
1583 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1584 if (tmp == NULL) {
1585 PERROR("realloc ust app events");
1586 ret = -ENOMEM;
1587 goto rcu_error;
1588 }
1589 }
1590 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1591 tmp[count].loglevel = uiter.loglevel;
1592 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1593 tmp[count].pid = app->pid;
1594 tmp[count].enabled = -1;
1595 count++;
1596 }
1597 }
1598
1599 ret = count;
1600 *events = tmp;
1601
1602 DBG2("UST app list events done (%zu events)", count);
1603
1604 rcu_error:
1605 rcu_read_unlock();
1606 error:
1607 health_code_update(&health_thread_cmd);
1608 return ret;
1609 }
1610
1611 /*
1612 * Fill events array with all events name of all registered apps.
1613 */
1614 int ust_app_list_event_fields(struct lttng_event_field **fields)
1615 {
1616 int ret, handle;
1617 size_t nbmem, count = 0;
1618 struct lttng_ht_iter iter;
1619 struct ust_app *app;
1620 struct lttng_event_field *tmp;
1621
1622 nbmem = UST_APP_EVENT_LIST_SIZE;
1623 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1624 if (tmp == NULL) {
1625 PERROR("zmalloc ust app event fields");
1626 ret = -ENOMEM;
1627 goto error;
1628 }
1629
1630 rcu_read_lock();
1631
1632 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1633 struct lttng_ust_field_iter uiter;
1634
1635 health_code_update(&health_thread_cmd);
1636
1637 if (!app->compatible) {
1638 /*
1639 * TODO: In time, we should notice the caller of this error by
1640 * telling him that this is a version error.
1641 */
1642 continue;
1643 }
1644 handle = ustctl_tracepoint_field_list(app->sock);
1645 if (handle < 0) {
1646 ERR("UST app list event fields getting handle failed for app pid %d",
1647 app->pid);
1648 continue;
1649 }
1650
1651 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1652 &uiter)) != -ENOENT) {
1653 health_code_update(&health_thread_cmd);
1654 if (count >= nbmem) {
1655 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1656 2 * nbmem);
1657 nbmem *= 2;
1658 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1659 if (tmp == NULL) {
1660 PERROR("realloc ust app event fields");
1661 ret = -ENOMEM;
1662 goto rcu_error;
1663 }
1664 }
1665
1666 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1667 tmp[count].type = uiter.type;
1668
1669 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1670 tmp[count].event.loglevel = uiter.loglevel;
1671 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1672 tmp[count].event.pid = app->pid;
1673 tmp[count].event.enabled = -1;
1674 count++;
1675 }
1676 }
1677
1678 ret = count;
1679 *fields = tmp;
1680
1681 DBG2("UST app list event fields done (%zu events)", count);
1682
1683 rcu_error:
1684 rcu_read_unlock();
1685 error:
1686 health_code_update(&health_thread_cmd);
1687 return ret;
1688 }
1689
1690 /*
1691 * Free and clean all traceable apps of the global list.
1692 */
1693 void ust_app_clean_list(void)
1694 {
1695 int ret;
1696 struct lttng_ht_iter iter;
1697 struct lttng_ht_node_ulong *node;
1698
1699 DBG2("UST app cleaning registered apps hash table");
1700
1701 rcu_read_lock();
1702
1703 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1704 ret = lttng_ht_del(ust_app_ht, &iter);
1705 assert(!ret);
1706 call_rcu(&node->head, delete_ust_app_rcu);
1707 }
1708
1709 /* Cleanup socket hash table */
1710 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1711 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1712 assert(!ret);
1713 }
1714
1715 /* Destroy is done only when the ht is empty */
1716 lttng_ht_destroy(ust_app_ht);
1717 lttng_ht_destroy(ust_app_ht_by_sock);
1718
1719 rcu_read_unlock();
1720 }
1721
1722 /*
1723 * Init UST app hash table.
1724 */
1725 void ust_app_ht_alloc(void)
1726 {
1727 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1728 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1729 }
1730
1731 /*
1732 * For a specific UST session, disable the channel for all registered apps.
1733 */
1734 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1735 struct ltt_ust_channel *uchan)
1736 {
1737 int ret = 0;
1738 struct lttng_ht_iter iter;
1739 struct lttng_ht_node_str *ua_chan_node;
1740 struct ust_app *app;
1741 struct ust_app_session *ua_sess;
1742 struct ust_app_channel *ua_chan;
1743
1744 if (usess == NULL || uchan == NULL) {
1745 ERR("Disabling UST global channel with NULL values");
1746 ret = -1;
1747 goto error;
1748 }
1749
1750 DBG2("UST app disabling channel %s from global domain for session id %d",
1751 uchan->name, usess->id);
1752
1753 rcu_read_lock();
1754
1755 /* For every registered applications */
1756 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1757 struct lttng_ht_iter uiter;
1758 if (!app->compatible) {
1759 /*
1760 * TODO: In time, we should notice the caller of this error by
1761 * telling him that this is a version error.
1762 */
1763 continue;
1764 }
1765 ua_sess = lookup_session_by_app(usess, app);
1766 if (ua_sess == NULL) {
1767 continue;
1768 }
1769
1770 /* Get channel */
1771 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1772 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1773 /* If the session if found for the app, the channel must be there */
1774 assert(ua_chan_node);
1775
1776 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1777 /* The channel must not be already disabled */
1778 assert(ua_chan->enabled == 1);
1779
1780 /* Disable channel onto application */
1781 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1782 if (ret < 0) {
1783 /* XXX: We might want to report this error at some point... */
1784 continue;
1785 }
1786 }
1787
1788 rcu_read_unlock();
1789
1790 error:
1791 return ret;
1792 }
1793
1794 /*
1795 * For a specific UST session, enable the channel for all registered apps.
1796 */
1797 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1798 struct ltt_ust_channel *uchan)
1799 {
1800 int ret = 0;
1801 struct lttng_ht_iter iter;
1802 struct ust_app *app;
1803 struct ust_app_session *ua_sess;
1804
1805 if (usess == NULL || uchan == NULL) {
1806 ERR("Adding UST global channel to NULL values");
1807 ret = -1;
1808 goto error;
1809 }
1810
1811 DBG2("UST app enabling channel %s to global domain for session id %d",
1812 uchan->name, usess->id);
1813
1814 rcu_read_lock();
1815
1816 /* For every registered applications */
1817 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1818 if (!app->compatible) {
1819 /*
1820 * TODO: In time, we should notice the caller of this error by
1821 * telling him that this is a version error.
1822 */
1823 continue;
1824 }
1825 ua_sess = lookup_session_by_app(usess, app);
1826 if (ua_sess == NULL) {
1827 continue;
1828 }
1829
1830 /* Enable channel onto application */
1831 ret = enable_ust_app_channel(ua_sess, uchan, app);
1832 if (ret < 0) {
1833 /* XXX: We might want to report this error at some point... */
1834 continue;
1835 }
1836 }
1837
1838 rcu_read_unlock();
1839
1840 error:
1841 return ret;
1842 }
1843
1844 /*
1845 * Disable an event in a channel and for a specific session.
1846 */
1847 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1848 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1849 {
1850 int ret = 0;
1851 struct lttng_ht_iter iter, uiter;
1852 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1853 struct ust_app *app;
1854 struct ust_app_session *ua_sess;
1855 struct ust_app_channel *ua_chan;
1856 struct ust_app_event *ua_event;
1857
1858 DBG("UST app disabling event %s for all apps in channel "
1859 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1860
1861 rcu_read_lock();
1862
1863 /* For all registered applications */
1864 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1865 if (!app->compatible) {
1866 /*
1867 * TODO: In time, we should notice the caller of this error by
1868 * telling him that this is a version error.
1869 */
1870 continue;
1871 }
1872 ua_sess = lookup_session_by_app(usess, app);
1873 if (ua_sess == NULL) {
1874 /* Next app */
1875 continue;
1876 }
1877
1878 /* Lookup channel in the ust app session */
1879 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1880 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1881 if (ua_chan_node == NULL) {
1882 DBG2("Channel %s not found in session id %d for app pid %d."
1883 "Skipping", uchan->name, usess->id, app->pid);
1884 continue;
1885 }
1886 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1887
1888 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1889 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1890 if (ua_event_node == NULL) {
1891 DBG2("Event %s not found in channel %s for app pid %d."
1892 "Skipping", uevent->attr.name, uchan->name, app->pid);
1893 continue;
1894 }
1895 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1896
1897 ret = disable_ust_app_event(ua_sess, ua_event, app);
1898 if (ret < 0) {
1899 /* XXX: Report error someday... */
1900 continue;
1901 }
1902 }
1903
1904 rcu_read_unlock();
1905
1906 return ret;
1907 }
1908
1909 /*
1910 * For a specific UST session and UST channel, the event for all
1911 * registered apps.
1912 */
1913 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1914 struct ltt_ust_channel *uchan)
1915 {
1916 int ret = 0;
1917 struct lttng_ht_iter iter, uiter;
1918 struct lttng_ht_node_str *ua_chan_node;
1919 struct ust_app *app;
1920 struct ust_app_session *ua_sess;
1921 struct ust_app_channel *ua_chan;
1922 struct ust_app_event *ua_event;
1923
1924 DBG("UST app disabling all event for all apps in channel "
1925 "%s for session id %d", uchan->name, usess->id);
1926
1927 rcu_read_lock();
1928
1929 /* For all registered applications */
1930 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1931 if (!app->compatible) {
1932 /*
1933 * TODO: In time, we should notice the caller of this error by
1934 * telling him that this is a version error.
1935 */
1936 continue;
1937 }
1938 ua_sess = lookup_session_by_app(usess, app);
1939 /* If ua_sess is NULL, there is a code flow error */
1940 assert(ua_sess);
1941
1942 /* Lookup channel in the ust app session */
1943 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1944 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1945 /* If the channel is not found, there is a code flow error */
1946 assert(ua_chan_node);
1947
1948 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1949
1950 /* Disable each events of channel */
1951 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1952 node.node) {
1953 ret = disable_ust_app_event(ua_sess, ua_event, app);
1954 if (ret < 0) {
1955 /* XXX: Report error someday... */
1956 continue;
1957 }
1958 }
1959 }
1960
1961 rcu_read_unlock();
1962
1963 return ret;
1964 }
1965
1966 /*
1967 * For a specific UST session, create the channel for all registered apps.
1968 */
1969 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1970 struct ltt_ust_channel *uchan)
1971 {
1972 struct lttng_ht_iter iter;
1973 struct ust_app *app;
1974 struct ust_app_session *ua_sess;
1975 struct ust_app_channel *ua_chan;
1976
1977 /* Very wrong code flow */
1978 assert(usess);
1979 assert(uchan);
1980
1981 DBG2("UST app adding channel %s to global domain for session id %d",
1982 uchan->name, usess->id);
1983
1984 rcu_read_lock();
1985
1986 /* For every registered applications */
1987 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1988 if (!app->compatible) {
1989 /*
1990 * TODO: In time, we should notice the caller of this error by
1991 * telling him that this is a version error.
1992 */
1993 continue;
1994 }
1995 /*
1996 * Create session on the tracer side and add it to app session HT. Note
1997 * that if session exist, it will simply return a pointer to the ust
1998 * app session.
1999 */
2000 ua_sess = create_ust_app_session(usess, app);
2001 if (ua_sess == NULL) {
2002 /* The malloc() failed. */
2003 goto error;
2004 } else if (ua_sess == (void *) -1UL) {
2005 /* The application's socket is not valid. Contiuing */
2006 continue;
2007 }
2008
2009 /* Create channel onto application */
2010 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2011 if (ua_chan == NULL) {
2012 /* Major problem here and it's maybe the tracer or malloc() */
2013 goto error;
2014 }
2015 }
2016
2017 rcu_read_unlock();
2018
2019 return 0;
2020
2021 error:
2022 return -1;
2023 }
2024
2025 /*
2026 * Enable event for a specific session and channel on the tracer.
2027 */
2028 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
2029 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2030 {
2031 int ret = 0;
2032 struct lttng_ht_iter iter, uiter;
2033 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2034 struct ust_app *app;
2035 struct ust_app_session *ua_sess;
2036 struct ust_app_channel *ua_chan;
2037 struct ust_app_event *ua_event;
2038
2039 DBG("UST app enabling event %s for all apps for session id %d",
2040 uevent->attr.name, usess->id);
2041
2042 /*
2043 * NOTE: At this point, this function is called only if the session and
2044 * channel passed are already created for all apps. and enabled on the
2045 * tracer also.
2046 */
2047
2048 rcu_read_lock();
2049
2050 /* For all registered applications */
2051 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2052 if (!app->compatible) {
2053 /*
2054 * TODO: In time, we should notice the caller of this error by
2055 * telling him that this is a version error.
2056 */
2057 continue;
2058 }
2059 ua_sess = lookup_session_by_app(usess, app);
2060 /* If ua_sess is NULL, there is a code flow error */
2061 assert(ua_sess);
2062
2063 /* Lookup channel in the ust app session */
2064 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2065 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2066 /* If the channel is not found, there is a code flow error */
2067 assert(ua_chan_node);
2068
2069 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2070
2071 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2072 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2073 if (ua_event_node == NULL) {
2074 DBG3("UST app enable event %s not found for app PID %d."
2075 "Skipping app", uevent->attr.name, app->pid);
2076 continue;
2077 }
2078 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2079
2080 ret = enable_ust_app_event(ua_sess, ua_event, app);
2081 if (ret < 0) {
2082 goto error;
2083 }
2084 }
2085
2086 error:
2087 rcu_read_unlock();
2088 return ret;
2089 }
2090
2091 /*
2092 * For a specific existing UST session and UST channel, creates the event for
2093 * all registered apps.
2094 */
2095 int ust_app_create_event_glb(struct ltt_ust_session *usess,
2096 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2097 {
2098 int ret = 0;
2099 struct lttng_ht_iter iter, uiter;
2100 struct lttng_ht_node_str *ua_chan_node;
2101 struct ust_app *app;
2102 struct ust_app_session *ua_sess;
2103 struct ust_app_channel *ua_chan;
2104
2105 DBG("UST app creating event %s for all apps for session id %d",
2106 uevent->attr.name, usess->id);
2107
2108 rcu_read_lock();
2109
2110 /* For all registered applications */
2111 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2112 if (!app->compatible) {
2113 /*
2114 * TODO: In time, we should notice the caller of this error by
2115 * telling him that this is a version error.
2116 */
2117 continue;
2118 }
2119 ua_sess = lookup_session_by_app(usess, app);
2120 /* If ua_sess is NULL, there is a code flow error */
2121 assert(ua_sess);
2122
2123 /* Lookup channel in the ust app session */
2124 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2125 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2126 /* If the channel is not found, there is a code flow error */
2127 assert(ua_chan_node);
2128
2129 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2130
2131 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2132 if (ret < 0) {
2133 if (ret != -EEXIST) {
2134 /* Possible value at this point: -ENOMEM. If so, we stop! */
2135 break;
2136 }
2137 DBG2("UST app event %s already exist on app PID %d",
2138 uevent->attr.name, app->pid);
2139 continue;
2140 }
2141 }
2142
2143 rcu_read_unlock();
2144
2145 return ret;
2146 }
2147
2148 /*
2149 * Start tracing for a specific UST session and app.
2150 */
2151 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
2152 {
2153 int ret = 0;
2154 struct lttng_ht_iter iter;
2155 struct ust_app_session *ua_sess;
2156 struct ust_app_channel *ua_chan;
2157 struct ltt_ust_stream *ustream;
2158 int consumerd_fd;
2159
2160 DBG("Starting tracing for ust app pid %d", app->pid);
2161
2162 rcu_read_lock();
2163
2164 if (!app->compatible) {
2165 goto end;
2166 }
2167
2168 ua_sess = lookup_session_by_app(usess, app);
2169 if (ua_sess == NULL) {
2170 goto error_rcu_unlock;
2171 }
2172
2173 /* Upon restart, we skip the setup, already done */
2174 if (ua_sess->started) {
2175 goto skip_setup;
2176 }
2177
2178 /* Indicate that the session has been started once */
2179 ua_sess->started = 1;
2180
2181 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2182 if (ret < 0) {
2183 goto error_rcu_unlock;
2184 }
2185
2186 /* For each channel */
2187 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2188 node.node) {
2189 /* Create all streams */
2190 while (1) {
2191 /* Create UST stream */
2192 ustream = zmalloc(sizeof(*ustream));
2193 if (ustream == NULL) {
2194 PERROR("zmalloc ust stream");
2195 goto error_rcu_unlock;
2196 }
2197
2198 /* We are going to receive 2 fds, we need to reserve them. */
2199 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2200 if (ret < 0) {
2201 ERR("Exhausted number of available FD upon stream create");
2202 free(ustream);
2203 goto error_rcu_unlock;
2204 }
2205
2206 health_code_update(&health_thread_cmd);
2207
2208 ret = ustctl_create_stream(app->sock, ua_chan->obj,
2209 &ustream->obj);
2210 if (ret < 0) {
2211 /* Got all streams */
2212 lttng_fd_put(LTTNG_FD_APPS, 2);
2213 free(ustream);
2214 break;
2215 }
2216 ustream->handle = ustream->obj->handle;
2217
2218 health_code_update(&health_thread_cmd);
2219
2220 /* Order is important */
2221 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
2222 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2223 ua_chan->name, ua_chan->streams.count++);
2224 if (ret < 0) {
2225 PERROR("asprintf UST create stream");
2226 /*
2227 * XXX what should we do here with the
2228 * stream ?
2229 */
2230 continue;
2231 }
2232 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2233 ustream->handle);
2234 }
2235
2236 health_code_update(&health_thread_cmd);
2237 }
2238
2239 switch (app->bits_per_long) {
2240 case 64:
2241 consumerd_fd = ust_consumerd64_fd;
2242 break;
2243 case 32:
2244 consumerd_fd = ust_consumerd32_fd;
2245 break;
2246 default:
2247 ret = -EINVAL;
2248 goto error_rcu_unlock;
2249 }
2250
2251 /* Setup UST consumer socket and send fds to it */
2252 ret = ust_consumer_send_session(consumerd_fd, ua_sess, usess->consumer);
2253 if (ret < 0) {
2254 goto error_rcu_unlock;
2255 }
2256
2257 health_code_update(&health_thread_cmd);
2258
2259 skip_setup:
2260 /* This start the UST tracing */
2261 ret = ustctl_start_session(app->sock, ua_sess->handle);
2262 if (ret < 0) {
2263 ERR("Error starting tracing for app pid: %d", app->pid);
2264 goto error_rcu_unlock;
2265 }
2266
2267 health_code_update(&health_thread_cmd);
2268
2269 /* Quiescent wait after starting trace */
2270 ustctl_wait_quiescent(app->sock);
2271
2272 end:
2273 rcu_read_unlock();
2274 health_code_update(&health_thread_cmd);
2275 return 0;
2276
2277 error_rcu_unlock:
2278 rcu_read_unlock();
2279 health_code_update(&health_thread_cmd);
2280 return -1;
2281 }
2282
2283 /*
2284 * Stop tracing for a specific UST session and app.
2285 */
2286 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2287 {
2288 int ret = 0;
2289 struct lttng_ht_iter iter;
2290 struct ust_app_session *ua_sess;
2291 struct ust_app_channel *ua_chan;
2292
2293 DBG("Stopping tracing for ust app pid %d", app->pid);
2294
2295 rcu_read_lock();
2296
2297 if (!app->compatible) {
2298 goto end;
2299 }
2300
2301 ua_sess = lookup_session_by_app(usess, app);
2302 if (ua_sess == NULL) {
2303 /* Only malloc can failed so something is really wrong */
2304 goto error_rcu_unlock;
2305 }
2306
2307 /*
2308 * If started = 0, it means that stop trace has been called for a session
2309 * that was never started. This is a code flow error and should never
2310 * happen.
2311 */
2312 assert(ua_sess->started == 1);
2313
2314 health_code_update(&health_thread_cmd);
2315
2316 /* This inhibits UST tracing */
2317 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2318 if (ret < 0) {
2319 ERR("Error stopping tracing for app pid: %d", app->pid);
2320 goto error_rcu_unlock;
2321 }
2322
2323 health_code_update(&health_thread_cmd);
2324
2325 /* Quiescent wait after stopping trace */
2326 ustctl_wait_quiescent(app->sock);
2327
2328 health_code_update(&health_thread_cmd);
2329
2330 /* Flushing buffers */
2331 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2332 node.node) {
2333 health_code_update(&health_thread_cmd);
2334 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2335 if (ret < 0) {
2336 ERR("UST app PID %d channel %s flush failed with ret %d",
2337 app->pid, ua_chan->name, ret);
2338 /* Continuing flushing all buffers */
2339 continue;
2340 }
2341 }
2342
2343 health_code_update(&health_thread_cmd);
2344
2345 /* Flush all buffers before stopping */
2346 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2347 if (ret < 0) {
2348 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2349 ret);
2350 }
2351
2352 end:
2353 rcu_read_unlock();
2354 health_code_update(&health_thread_cmd);
2355 return 0;
2356
2357 error_rcu_unlock:
2358 rcu_read_unlock();
2359 health_code_update(&health_thread_cmd);
2360 return -1;
2361 }
2362
2363 /*
2364 * Destroy a specific UST session in apps.
2365 */
2366 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2367 {
2368 struct ust_app_session *ua_sess;
2369 struct lttng_ust_object_data obj;
2370 struct lttng_ht_iter iter;
2371 struct lttng_ht_node_ulong *node;
2372 int ret;
2373
2374 DBG("Destroy tracing for ust app pid %d", app->pid);
2375
2376 rcu_read_lock();
2377
2378 if (!app->compatible) {
2379 goto end;
2380 }
2381
2382 __lookup_session_by_app(usess, app, &iter);
2383 node = lttng_ht_iter_get_node_ulong(&iter);
2384 if (node == NULL) {
2385 /* Only malloc can failed so something is really wrong */
2386 goto error_rcu_unlock;
2387 }
2388 ua_sess = caa_container_of(node, struct ust_app_session, node);
2389 ret = lttng_ht_del(app->sessions, &iter);
2390 assert(!ret);
2391 obj.handle = ua_sess->handle;
2392 obj.shm_fd = -1;
2393 obj.wait_fd = -1;
2394 obj.memory_map_size = 0;
2395 health_code_update(&health_thread_cmd);
2396 ustctl_release_object(app->sock, &obj);
2397
2398 health_code_update(&health_thread_cmd);
2399 delete_ust_app_session(app->sock, ua_sess);
2400
2401 /* Quiescent wait after stopping trace */
2402 ustctl_wait_quiescent(app->sock);
2403
2404 end:
2405 rcu_read_unlock();
2406 health_code_update(&health_thread_cmd);
2407 return 0;
2408
2409 error_rcu_unlock:
2410 rcu_read_unlock();
2411 health_code_update(&health_thread_cmd);
2412 return -1;
2413 }
2414
2415 /*
2416 * Start tracing for the UST session.
2417 */
2418 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2419 {
2420 int ret = 0;
2421 struct lttng_ht_iter iter;
2422 struct ust_app *app;
2423
2424 DBG("Starting all UST traces");
2425
2426 rcu_read_lock();
2427
2428 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2429 ret = ust_app_start_trace(usess, app);
2430 if (ret < 0) {
2431 /* Continue to next apps even on error */
2432 continue;
2433 }
2434 }
2435
2436 rcu_read_unlock();
2437
2438 return 0;
2439 }
2440
2441 /*
2442 * Start tracing for the UST session.
2443 */
2444 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2445 {
2446 int ret = 0;
2447 struct lttng_ht_iter iter;
2448 struct ust_app *app;
2449
2450 DBG("Stopping all UST traces");
2451
2452 rcu_read_lock();
2453
2454 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2455 ret = ust_app_stop_trace(usess, app);
2456 if (ret < 0) {
2457 /* Continue to next apps even on error */
2458 continue;
2459 }
2460 }
2461
2462 rcu_read_unlock();
2463
2464 return 0;
2465 }
2466
2467 /*
2468 * Destroy app UST session.
2469 */
2470 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2471 {
2472 int ret = 0;
2473 struct lttng_ht_iter iter;
2474 struct ust_app *app;
2475
2476 DBG("Destroy all UST traces");
2477
2478 rcu_read_lock();
2479
2480 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2481 ret = ust_app_destroy_trace(usess, app);
2482 if (ret < 0) {
2483 /* Continue to next apps even on error */
2484 continue;
2485 }
2486 }
2487
2488 rcu_read_unlock();
2489
2490 return 0;
2491 }
2492
2493 /*
2494 * Add channels/events from UST global domain to registered apps at sock.
2495 */
2496 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2497 {
2498 int ret = 0;
2499 struct lttng_ht_iter iter, uiter, iter_ctx;
2500 struct ust_app *app;
2501 struct ust_app_session *ua_sess;
2502 struct ust_app_channel *ua_chan;
2503 struct ust_app_event *ua_event;
2504 struct ust_app_ctx *ua_ctx;
2505
2506 if (usess == NULL) {
2507 ERR("No UST session on global update. Returning");
2508 goto error;
2509 }
2510
2511 DBG2("UST app global update for app sock %d for session id %d", sock,
2512 usess->id);
2513
2514 rcu_read_lock();
2515
2516 app = find_app_by_sock(sock);
2517 if (app == NULL) {
2518 ERR("Failed to update app sock %d", sock);
2519 goto error;
2520 }
2521
2522 if (!app->compatible) {
2523 goto error;
2524 }
2525
2526 ua_sess = create_ust_app_session(usess, app);
2527 if (ua_sess == NULL) {
2528 goto error;
2529 }
2530
2531 /*
2532 * We can iterate safely here over all UST app session sicne the create ust
2533 * app session above made a shadow copy of the UST global domain from the
2534 * ltt ust session.
2535 */
2536 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2537 node.node) {
2538 ret = create_ust_channel(app, ua_sess, ua_chan);
2539 if (ret < 0) {
2540 /* FIXME: Should we quit here or continue... */
2541 continue;
2542 }
2543
2544 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2545 node.node) {
2546 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2547 if (ret < 0) {
2548 /* FIXME: Should we quit here or continue... */
2549 continue;
2550 }
2551 }
2552
2553
2554 /* For each events */
2555 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2556 node.node) {
2557 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2558 if (ret < 0) {
2559 /* FIXME: Should we quit here or continue... */
2560 continue;
2561 }
2562
2563 /* Add context on events. */
2564 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2565 ua_ctx, node.node) {
2566 ret = create_ust_event_context(ua_event, ua_ctx, app);
2567 if (ret < 0) {
2568 /* FIXME: Should we quit here or continue... */
2569 continue;
2570 }
2571 }
2572 ret = set_ust_event_filter(ua_event, app);
2573 if (ret < 0) {
2574 /* FIXME: Should we quit here or continue... */
2575 continue;
2576 }
2577 }
2578 }
2579
2580 if (usess->start_trace) {
2581 ret = ust_app_start_trace(usess, app);
2582 if (ret < 0) {
2583 goto error;
2584 }
2585
2586 DBG2("UST trace started for app pid %d", app->pid);
2587 }
2588
2589 error:
2590 rcu_read_unlock();
2591 return;
2592 }
2593
2594 /*
2595 * Add context to a specific channel for global UST domain.
2596 */
2597 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2598 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2599 {
2600 int ret = 0;
2601 struct lttng_ht_node_str *ua_chan_node;
2602 struct lttng_ht_iter iter, uiter;
2603 struct ust_app_channel *ua_chan = NULL;
2604 struct ust_app_session *ua_sess;
2605 struct ust_app *app;
2606
2607 rcu_read_lock();
2608
2609 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2610 if (!app->compatible) {
2611 /*
2612 * TODO: In time, we should notice the caller of this error by
2613 * telling him that this is a version error.
2614 */
2615 continue;
2616 }
2617 ua_sess = lookup_session_by_app(usess, app);
2618 if (ua_sess == NULL) {
2619 continue;
2620 }
2621
2622 /* Lookup channel in the ust app session */
2623 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2624 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2625 if (ua_chan_node == NULL) {
2626 continue;
2627 }
2628 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2629 node);
2630
2631 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2632 if (ret < 0) {
2633 continue;
2634 }
2635 }
2636
2637 rcu_read_unlock();
2638 return ret;
2639 }
2640
2641 /*
2642 * Add context to a specific event in a channel for global UST domain.
2643 */
2644 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2645 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2646 struct ltt_ust_context *uctx)
2647 {
2648 int ret = 0;
2649 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2650 struct lttng_ht_iter iter, uiter;
2651 struct ust_app_session *ua_sess;
2652 struct ust_app_event *ua_event;
2653 struct ust_app_channel *ua_chan = NULL;
2654 struct ust_app *app;
2655
2656 rcu_read_lock();
2657
2658 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2659 if (!app->compatible) {
2660 /*
2661 * TODO: In time, we should notice the caller of this error by
2662 * telling him that this is a version error.
2663 */
2664 continue;
2665 }
2666 ua_sess = lookup_session_by_app(usess, app);
2667 if (ua_sess == NULL) {
2668 continue;
2669 }
2670
2671 /* Lookup channel in the ust app session */
2672 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2673 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2674 if (ua_chan_node == NULL) {
2675 continue;
2676 }
2677 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2678 node);
2679
2680 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2681 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2682 if (ua_event_node == NULL) {
2683 continue;
2684 }
2685 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2686 node);
2687
2688 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2689 if (ret < 0) {
2690 continue;
2691 }
2692 }
2693
2694 rcu_read_unlock();
2695 return ret;
2696 }
2697
2698 /*
2699 * Add context to a specific event in a channel for global UST domain.
2700 */
2701 int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2702 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2703 struct lttng_filter_bytecode *bytecode)
2704 {
2705 int ret = 0;
2706 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2707 struct lttng_ht_iter iter, uiter;
2708 struct ust_app_session *ua_sess;
2709 struct ust_app_event *ua_event;
2710 struct ust_app_channel *ua_chan = NULL;
2711 struct ust_app *app;
2712
2713 rcu_read_lock();
2714
2715 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2716 if (!app->compatible) {
2717 /*
2718 * TODO: In time, we should notice the caller of this error by
2719 * telling him that this is a version error.
2720 */
2721 continue;
2722 }
2723 ua_sess = lookup_session_by_app(usess, app);
2724 if (ua_sess == NULL) {
2725 continue;
2726 }
2727
2728 /* Lookup channel in the ust app session */
2729 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2730 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2731 if (ua_chan_node == NULL) {
2732 continue;
2733 }
2734 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2735 node);
2736
2737 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2738 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2739 if (ua_event_node == NULL) {
2740 continue;
2741 }
2742 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2743 node);
2744
2745 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2746 if (ret < 0) {
2747 continue;
2748 }
2749 }
2750
2751 rcu_read_unlock();
2752 return ret;
2753 }
2754
2755 /*
2756 * Enable event for a channel from a UST session for a specific PID.
2757 */
2758 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2759 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2760 {
2761 int ret = 0;
2762 struct lttng_ht_iter iter;
2763 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2764 struct ust_app *app;
2765 struct ust_app_session *ua_sess;
2766 struct ust_app_channel *ua_chan;
2767 struct ust_app_event *ua_event;
2768
2769 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2770
2771 rcu_read_lock();
2772
2773 app = ust_app_find_by_pid(pid);
2774 if (app == NULL) {
2775 ERR("UST app enable event per PID %d not found", pid);
2776 ret = -1;
2777 goto error;
2778 }
2779
2780 if (!app->compatible) {
2781 ret = 0;
2782 goto error;
2783 }
2784
2785 ua_sess = lookup_session_by_app(usess, app);
2786 /* If ua_sess is NULL, there is a code flow error */
2787 assert(ua_sess);
2788
2789 /* Lookup channel in the ust app session */
2790 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2791 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2792 /* If the channel is not found, there is a code flow error */
2793 assert(ua_chan_node);
2794
2795 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2796
2797 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2798 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2799 if (ua_event_node == NULL) {
2800 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2801 if (ret < 0) {
2802 goto error;
2803 }
2804 } else {
2805 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2806
2807 ret = enable_ust_app_event(ua_sess, ua_event, app);
2808 if (ret < 0) {
2809 goto error;
2810 }
2811 }
2812
2813 error:
2814 rcu_read_unlock();
2815 return ret;
2816 }
2817
2818 /*
2819 * Disable event for a channel from a UST session for a specific PID.
2820 */
2821 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2822 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2823 {
2824 int ret = 0;
2825 struct lttng_ht_iter iter;
2826 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2827 struct ust_app *app;
2828 struct ust_app_session *ua_sess;
2829 struct ust_app_channel *ua_chan;
2830 struct ust_app_event *ua_event;
2831
2832 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2833
2834 rcu_read_lock();
2835
2836 app = ust_app_find_by_pid(pid);
2837 if (app == NULL) {
2838 ERR("UST app disable event per PID %d not found", pid);
2839 ret = -1;
2840 goto error;
2841 }
2842
2843 if (!app->compatible) {
2844 ret = 0;
2845 goto error;
2846 }
2847
2848 ua_sess = lookup_session_by_app(usess, app);
2849 /* If ua_sess is NULL, there is a code flow error */
2850 assert(ua_sess);
2851
2852 /* Lookup channel in the ust app session */
2853 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2854 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2855 if (ua_chan_node == NULL) {
2856 /* Channel does not exist, skip disabling */
2857 goto error;
2858 }
2859 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2860
2861 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2862 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2863 if (ua_event_node == NULL) {
2864 /* Event does not exist, skip disabling */
2865 goto error;
2866 }
2867 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2868
2869 ret = disable_ust_app_event(ua_sess, ua_event, app);
2870 if (ret < 0) {
2871 goto error;
2872 }
2873
2874 error:
2875 rcu_read_unlock();
2876 return ret;
2877 }
2878
2879 /*
2880 * Validate version of UST apps and set the compatible bit.
2881 */
2882 int ust_app_validate_version(int sock)
2883 {
2884 int ret;
2885 struct ust_app *app;
2886
2887 rcu_read_lock();
2888
2889 app = find_app_by_sock(sock);
2890 assert(app);
2891
2892 health_code_update(&health_thread_cmd);
2893
2894 ret = ustctl_tracer_version(sock, &app->version);
2895 if (ret < 0) {
2896 goto error;
2897 }
2898
2899 /* Validate version */
2900 if (app->version.major > UST_APP_MAJOR_VERSION) {
2901 goto error;
2902 }
2903
2904 DBG2("UST app PID %d is compatible with major version %d "
2905 "(supporting <= %d)", app->pid, app->version.major,
2906 UST_APP_MAJOR_VERSION);
2907 app->compatible = 1;
2908 rcu_read_unlock();
2909 health_code_update(&health_thread_cmd);
2910 return 0;
2911
2912 error:
2913 DBG2("UST app PID %d is not compatible with major version %d "
2914 "(supporting <= %d)", app->pid, app->version.major,
2915 UST_APP_MAJOR_VERSION);
2916 app->compatible = 0;
2917 rcu_read_unlock();
2918 health_code_update(&health_thread_cmd);
2919 return -1;
2920 }
2921
2922 /*
2923 * Calibrate registered applications.
2924 */
2925 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2926 {
2927 int ret = 0;
2928 struct lttng_ht_iter iter;
2929 struct ust_app *app;
2930
2931 rcu_read_lock();
2932
2933 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2934 if (!app->compatible) {
2935 /*
2936 * TODO: In time, we should notice the caller of this error by
2937 * telling him that this is a version error.
2938 */
2939 continue;
2940 }
2941
2942 health_code_update(&health_thread_cmd);
2943
2944 ret = ustctl_calibrate(app->sock, calibrate);
2945 if (ret < 0) {
2946 switch (ret) {
2947 case -ENOSYS:
2948 /* Means that it's not implemented on the tracer side. */
2949 ret = 0;
2950 break;
2951 default:
2952 /* TODO: Report error to user */
2953 DBG2("Calibrate app PID %d returned with error %d",
2954 app->pid, ret);
2955 break;
2956 }
2957 }
2958 }
2959
2960 DBG("UST app global domain calibration finished");
2961
2962 rcu_read_unlock();
2963
2964 health_code_update(&health_thread_cmd);
2965
2966 return ret;
2967 }
LTTng 2.0 tools and control repository
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