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Fix: Bad return error code handling
[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 delete_ust_app_session(-1, ua_sess);
980 /* This means that the tracer is gone... */
981 ua_sess = (void*) -1UL;
982 goto end;
983 }
984
985 ua_sess->handle = ret;
986
987 /* Add ust app session to app's HT */
988 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
989 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
990
991 DBG2("UST app session created successfully with handle %d", ret);
992 }
993
994 end:
995 health_code_update(&health_thread_cmd);
996 return ua_sess;
997 }
998
999 /*
1000 * Create a context for the channel on the tracer.
1001 */
1002 static
1003 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1004 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1005 struct ust_app *app)
1006 {
1007 int ret = 0;
1008 struct lttng_ht_iter iter;
1009 struct lttng_ht_node_ulong *node;
1010 struct ust_app_ctx *ua_ctx;
1011
1012 DBG2("UST app adding context to channel %s", ua_chan->name);
1013
1014 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1015 node = lttng_ht_iter_get_node_ulong(&iter);
1016 if (node != NULL) {
1017 ret = -EEXIST;
1018 goto error;
1019 }
1020
1021 ua_ctx = alloc_ust_app_ctx(uctx);
1022 if (ua_ctx == NULL) {
1023 /* malloc failed */
1024 ret = -1;
1025 goto error;
1026 }
1027
1028 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1029 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
1030
1031 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1032 if (ret < 0) {
1033 goto error;
1034 }
1035
1036 error:
1037 return ret;
1038 }
1039
1040 /*
1041 * Create an UST context and enable it for the event on the tracer.
1042 */
1043 static
1044 int create_ust_app_event_context(struct ust_app_session *ua_sess,
1045 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1046 struct ust_app *app)
1047 {
1048 int ret = 0;
1049 struct lttng_ht_iter iter;
1050 struct lttng_ht_node_ulong *node;
1051 struct ust_app_ctx *ua_ctx;
1052
1053 DBG2("UST app adding context to event %s", ua_event->name);
1054
1055 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1056 node = lttng_ht_iter_get_node_ulong(&iter);
1057 if (node != NULL) {
1058 ret = -EEXIST;
1059 goto error;
1060 }
1061
1062 ua_ctx = alloc_ust_app_ctx(uctx);
1063 if (ua_ctx == NULL) {
1064 /* malloc failed */
1065 ret = -1;
1066 goto error;
1067 }
1068
1069 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1070 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
1071
1072 ret = create_ust_event_context(ua_event, ua_ctx, app);
1073 if (ret < 0) {
1074 goto error;
1075 }
1076
1077 error:
1078 return ret;
1079 }
1080
1081 /*
1082 * Set UST filter for the event on the tracer.
1083 */
1084 static
1085 int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1086 struct ust_app_event *ua_event,
1087 struct lttng_filter_bytecode *bytecode,
1088 struct ust_app *app)
1089 {
1090 int ret = 0;
1091
1092 DBG2("UST app adding context to event %s", ua_event->name);
1093
1094 /* Copy filter bytecode */
1095 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1096 if (!ua_event->filter) {
1097 return -ENOMEM;
1098 }
1099 memcpy(ua_event->filter, bytecode,
1100 sizeof(*ua_event->filter) + bytecode->len);
1101 ret = set_ust_event_filter(ua_event, app);
1102 if (ret < 0) {
1103 goto error;
1104 }
1105
1106 error:
1107 return ret;
1108 }
1109
1110 /*
1111 * Enable on the tracer side a ust app event for the session and channel.
1112 */
1113 static
1114 int enable_ust_app_event(struct ust_app_session *ua_sess,
1115 struct ust_app_event *ua_event, struct ust_app *app)
1116 {
1117 int ret;
1118
1119 ret = enable_ust_event(app, ua_sess, ua_event);
1120 if (ret < 0) {
1121 goto error;
1122 }
1123
1124 ua_event->enabled = 1;
1125
1126 error:
1127 return ret;
1128 }
1129
1130 /*
1131 * Disable on the tracer side a ust app event for the session and channel.
1132 */
1133 static int disable_ust_app_event(struct ust_app_session *ua_sess,
1134 struct ust_app_event *ua_event, struct ust_app *app)
1135 {
1136 int ret;
1137
1138 ret = disable_ust_event(app, ua_sess, ua_event);
1139 if (ret < 0) {
1140 goto error;
1141 }
1142
1143 ua_event->enabled = 0;
1144
1145 error:
1146 return ret;
1147 }
1148
1149 /*
1150 * Lookup ust app channel for session and disable it on the tracer side.
1151 */
1152 static
1153 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1154 struct ust_app_channel *ua_chan, struct ust_app *app)
1155 {
1156 int ret;
1157
1158 ret = disable_ust_channel(app, ua_sess, ua_chan);
1159 if (ret < 0) {
1160 goto error;
1161 }
1162
1163 ua_chan->enabled = 0;
1164
1165 error:
1166 return ret;
1167 }
1168
1169 /*
1170 * Lookup ust app channel for session and enable it on the tracer side.
1171 */
1172 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1173 struct ltt_ust_channel *uchan, struct ust_app *app)
1174 {
1175 int ret = 0;
1176 struct lttng_ht_iter iter;
1177 struct lttng_ht_node_str *ua_chan_node;
1178 struct ust_app_channel *ua_chan;
1179
1180 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1181 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1182 if (ua_chan_node == NULL) {
1183 DBG2("Unable to find channel %s in ust session id %u",
1184 uchan->name, ua_sess->id);
1185 goto error;
1186 }
1187
1188 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1189
1190 ret = enable_ust_channel(app, ua_sess, ua_chan);
1191 if (ret < 0) {
1192 goto error;
1193 }
1194
1195 error:
1196 return ret;
1197 }
1198
1199 /*
1200 * Create UST app channel and create it on the tracer.
1201 */
1202 static struct ust_app_channel *create_ust_app_channel(
1203 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1204 struct ust_app *app)
1205 {
1206 int ret = 0;
1207 struct lttng_ht_iter iter;
1208 struct lttng_ht_node_str *ua_chan_node;
1209 struct ust_app_channel *ua_chan;
1210
1211 /* Lookup channel in the ust app session */
1212 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1213 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1214 if (ua_chan_node != NULL) {
1215 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1216 goto end;
1217 }
1218
1219 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1220 if (ua_chan == NULL) {
1221 /* Only malloc can fail here */
1222 goto error;
1223 }
1224 shadow_copy_channel(ua_chan, uchan);
1225
1226 ret = create_ust_channel(app, ua_sess, ua_chan);
1227 if (ret < 0) {
1228 /* Not found previously means that it does not exist on the tracer */
1229 assert(ret != -EEXIST);
1230 goto error;
1231 }
1232
1233 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1234
1235 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1236 app->pid);
1237
1238 end:
1239 return ua_chan;
1240
1241 error:
1242 delete_ust_app_channel(-1, ua_chan);
1243 return NULL;
1244 }
1245
1246 /*
1247 * Create UST app event and create it on the tracer side.
1248 */
1249 static
1250 int create_ust_app_event(struct ust_app_session *ua_sess,
1251 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1252 struct ust_app *app)
1253 {
1254 int ret = 0;
1255 struct lttng_ht_iter iter;
1256 struct lttng_ht_node_str *ua_event_node;
1257 struct ust_app_event *ua_event;
1258
1259 /* Get event node */
1260 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1261 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1262 if (ua_event_node != NULL) {
1263 ret = -EEXIST;
1264 goto end;
1265 }
1266
1267 /* Does not exist so create one */
1268 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1269 if (ua_event == NULL) {
1270 /* Only malloc can failed so something is really wrong */
1271 ret = -ENOMEM;
1272 goto end;
1273 }
1274 shadow_copy_event(ua_event, uevent);
1275
1276 /* Create it on the tracer side */
1277 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1278 if (ret < 0) {
1279 /* Not found previously means that it does not exist on the tracer */
1280 assert(ret != -EEXIST);
1281 goto error;
1282 }
1283
1284 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1285
1286 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1287 app->pid);
1288
1289 end:
1290 return ret;
1291
1292 error:
1293 /* Valid. Calling here is already in a read side lock */
1294 delete_ust_app_event(-1, ua_event);
1295 return ret;
1296 }
1297
1298 /*
1299 * Create UST metadata and open it on the tracer side.
1300 */
1301 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1302 char *pathname, struct ust_app *app)
1303 {
1304 int ret = 0;
1305
1306 if (ua_sess->metadata == NULL) {
1307 /* Allocate UST metadata */
1308 ua_sess->metadata = trace_ust_create_metadata(pathname);
1309 if (ua_sess->metadata == NULL) {
1310 /* malloc() failed */
1311 goto error;
1312 }
1313
1314 ret = open_ust_metadata(app, ua_sess);
1315 if (ret < 0) {
1316 DBG3("Opening metadata failed. Cleaning up memory");
1317
1318 /* Cleanup failed metadata struct */
1319 free(ua_sess->metadata);
1320 /*
1321 * This is very important because delete_ust_app_session check if
1322 * the pointer is null or not in order to delete the metadata.
1323 */
1324 ua_sess->metadata = NULL;
1325 goto error;
1326 }
1327
1328 DBG2("UST metadata opened for app pid %d", app->pid);
1329 }
1330
1331 /* Open UST metadata stream */
1332 if (ua_sess->metadata->stream_obj == NULL) {
1333 ret = create_ust_stream(app, ua_sess);
1334 if (ret < 0) {
1335 goto error;
1336 }
1337
1338 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1339 "%s/metadata", ua_sess->path);
1340 if (ret < 0) {
1341 PERROR("asprintf UST create stream");
1342 goto error;
1343 }
1344
1345 DBG2("UST metadata stream object created for app pid %d",
1346 app->pid);
1347 } else {
1348 ERR("Attempting to create stream without metadata opened");
1349 goto error;
1350 }
1351
1352 return 0;
1353
1354 error:
1355 return -1;
1356 }
1357
1358 /*
1359 * Return pointer to traceable apps list.
1360 */
1361 struct lttng_ht *ust_app_get_ht(void)
1362 {
1363 return ust_app_ht;
1364 }
1365
1366 /*
1367 * Return ust app pointer or NULL if not found.
1368 */
1369 struct ust_app *ust_app_find_by_pid(pid_t pid)
1370 {
1371 struct lttng_ht_node_ulong *node;
1372 struct lttng_ht_iter iter;
1373
1374 rcu_read_lock();
1375 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1376 node = lttng_ht_iter_get_node_ulong(&iter);
1377 if (node == NULL) {
1378 DBG2("UST app no found with pid %d", pid);
1379 goto error;
1380 }
1381 rcu_read_unlock();
1382
1383 DBG2("Found UST app by pid %d", pid);
1384
1385 return caa_container_of(node, struct ust_app, pid_n);
1386
1387 error:
1388 rcu_read_unlock();
1389 return NULL;
1390 }
1391
1392 /*
1393 * Using pid and uid (of the app), allocate a new ust_app struct and
1394 * add it to the global traceable app list.
1395 *
1396 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1397 * bitness is not supported.
1398 */
1399 int ust_app_register(struct ust_register_msg *msg, int sock)
1400 {
1401 struct ust_app *lta;
1402 int ret;
1403
1404 if ((msg->bits_per_long == 64 &&
1405 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1406 || (msg->bits_per_long == 32 &&
1407 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
1408 ERR("Registration failed: application \"%s\" (pid: %d) has "
1409 "%d-bit long, but no consumerd for this long size is available.\n",
1410 msg->name, msg->pid, msg->bits_per_long);
1411 ret = close(sock);
1412 if (ret) {
1413 PERROR("close");
1414 }
1415 lttng_fd_put(LTTNG_FD_APPS, 1);
1416 return -EINVAL;
1417 }
1418 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1419 ERR("Registration failed: application \"%s\" (pid: %d) has "
1420 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1421 msg->name, msg->pid, msg->major, msg->minor);
1422 ret = close(sock);
1423 if (ret) {
1424 PERROR("close");
1425 }
1426 lttng_fd_put(LTTNG_FD_APPS, 1);
1427 return -EINVAL;
1428 }
1429 lta = zmalloc(sizeof(struct ust_app));
1430 if (lta == NULL) {
1431 PERROR("malloc");
1432 return -ENOMEM;
1433 }
1434
1435 lta->ppid = msg->ppid;
1436 lta->uid = msg->uid;
1437 lta->gid = msg->gid;
1438 lta->compatible = 0; /* Not compatible until proven */
1439 lta->bits_per_long = msg->bits_per_long;
1440 lta->v_major = msg->major;
1441 lta->v_minor = msg->minor;
1442 strncpy(lta->name, msg->name, sizeof(lta->name));
1443 lta->name[16] = '\0';
1444 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1445
1446 lta->pid = msg->pid;
1447 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1448 lta->sock = sock;
1449 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
1450
1451 rcu_read_lock();
1452
1453 /*
1454 * On a re-registration, we want to kick out the previous registration of
1455 * that pid
1456 */
1457 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1458
1459 /*
1460 * The socket _should_ be unique until _we_ call close. So, a add_unique
1461 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1462 * already in the table.
1463 */
1464 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1465
1466 rcu_read_unlock();
1467
1468 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1469 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1470 lta->sock, lta->name, lta->v_major, lta->v_minor);
1471
1472 return 0;
1473 }
1474
1475 /*
1476 * Unregister app by removing it from the global traceable app list and freeing
1477 * the data struct.
1478 *
1479 * The socket is already closed at this point so no close to sock.
1480 */
1481 void ust_app_unregister(int sock)
1482 {
1483 struct ust_app *lta;
1484 struct lttng_ht_node_ulong *node;
1485 struct lttng_ht_iter iter;
1486 int ret;
1487
1488 rcu_read_lock();
1489
1490 /* Get the node reference for a call_rcu */
1491 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
1492 node = lttng_ht_iter_get_node_ulong(&iter);
1493 if (node == NULL) {
1494 ERR("Unable to find app by sock %d", sock);
1495 goto error;
1496 }
1497
1498 lta = caa_container_of(node, struct ust_app, sock_n);
1499
1500 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1501
1502 /* Remove application from PID hash table */
1503 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1504 assert(!ret);
1505
1506 /* Assign second node for deletion */
1507 iter.iter.node = &lta->pid_n.node;
1508
1509 /*
1510 * Ignore return value since the node might have been removed before by an
1511 * add replace during app registration because the PID can be reassigned by
1512 * the OS.
1513 */
1514 ret = lttng_ht_del(ust_app_ht, &iter);
1515 if (ret) {
1516 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1517 lta->pid);
1518 }
1519
1520 /* Free memory */
1521 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1522
1523 error:
1524 rcu_read_unlock();
1525 return;
1526 }
1527
1528 /*
1529 * Return traceable_app_count
1530 */
1531 unsigned long ust_app_list_count(void)
1532 {
1533 unsigned long count;
1534
1535 rcu_read_lock();
1536 count = lttng_ht_get_count(ust_app_ht);
1537 rcu_read_unlock();
1538
1539 return count;
1540 }
1541
1542 /*
1543 * Fill events array with all events name of all registered apps.
1544 */
1545 int ust_app_list_events(struct lttng_event **events)
1546 {
1547 int ret, handle;
1548 size_t nbmem, count = 0;
1549 struct lttng_ht_iter iter;
1550 struct ust_app *app;
1551 struct lttng_event *tmp;
1552
1553 nbmem = UST_APP_EVENT_LIST_SIZE;
1554 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1555 if (tmp == NULL) {
1556 PERROR("zmalloc ust app events");
1557 ret = -ENOMEM;
1558 goto error;
1559 }
1560
1561 rcu_read_lock();
1562
1563 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1564 struct lttng_ust_tracepoint_iter uiter;
1565
1566 health_code_update(&health_thread_cmd);
1567
1568 if (!app->compatible) {
1569 /*
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1572 */
1573 continue;
1574 }
1575 handle = ustctl_tracepoint_list(app->sock);
1576 if (handle < 0) {
1577 ERR("UST app list events getting handle failed for app pid %d",
1578 app->pid);
1579 continue;
1580 }
1581
1582 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
1583 &uiter)) != -ENOENT) {
1584 health_code_update(&health_thread_cmd);
1585 if (count >= nbmem) {
1586 /* In case the realloc fails, we free the memory */
1587 void *tmp_ptr = (void *) tmp;
1588 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1589 2 * nbmem);
1590 nbmem *= 2;
1591 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1592 if (tmp == NULL) {
1593 PERROR("realloc ust app events");
1594 free(tmp_ptr);
1595 ret = -ENOMEM;
1596 goto rcu_error;
1597 }
1598 }
1599 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1600 tmp[count].loglevel = uiter.loglevel;
1601 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1602 tmp[count].pid = app->pid;
1603 tmp[count].enabled = -1;
1604 count++;
1605 }
1606 }
1607
1608 ret = count;
1609 *events = tmp;
1610
1611 DBG2("UST app list events done (%zu events)", count);
1612
1613 rcu_error:
1614 rcu_read_unlock();
1615 error:
1616 health_code_update(&health_thread_cmd);
1617 return ret;
1618 }
1619
1620 /*
1621 * Fill events array with all events name of all registered apps.
1622 */
1623 int ust_app_list_event_fields(struct lttng_event_field **fields)
1624 {
1625 int ret, handle;
1626 size_t nbmem, count = 0;
1627 struct lttng_ht_iter iter;
1628 struct ust_app *app;
1629 struct lttng_event_field *tmp;
1630
1631 nbmem = UST_APP_EVENT_LIST_SIZE;
1632 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1633 if (tmp == NULL) {
1634 PERROR("zmalloc ust app event fields");
1635 ret = -ENOMEM;
1636 goto error;
1637 }
1638
1639 rcu_read_lock();
1640
1641 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1642 struct lttng_ust_field_iter uiter;
1643
1644 health_code_update(&health_thread_cmd);
1645
1646 if (!app->compatible) {
1647 /*
1648 * TODO: In time, we should notice the caller of this error by
1649 * telling him that this is a version error.
1650 */
1651 continue;
1652 }
1653 handle = ustctl_tracepoint_field_list(app->sock);
1654 if (handle < 0) {
1655 ERR("UST app list event fields getting handle failed for app pid %d",
1656 app->pid);
1657 continue;
1658 }
1659
1660 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1661 &uiter)) != -ENOENT) {
1662 health_code_update(&health_thread_cmd);
1663 if (count >= nbmem) {
1664 /* In case the realloc fails, we free the memory */
1665 void *tmp_ptr = (void *) tmp;
1666 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1667 2 * nbmem);
1668 nbmem *= 2;
1669 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1670 if (tmp == NULL) {
1671 PERROR("realloc ust app event fields");
1672 free(tmp_ptr);
1673 ret = -ENOMEM;
1674 goto rcu_error;
1675 }
1676 }
1677
1678 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1679 tmp[count].type = uiter.type;
1680 tmp[count].nowrite = uiter.nowrite;
1681
1682 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1683 tmp[count].event.loglevel = uiter.loglevel;
1684 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1685 tmp[count].event.pid = app->pid;
1686 tmp[count].event.enabled = -1;
1687 count++;
1688 }
1689 }
1690
1691 ret = count;
1692 *fields = tmp;
1693
1694 DBG2("UST app list event fields done (%zu events)", count);
1695
1696 rcu_error:
1697 rcu_read_unlock();
1698 error:
1699 health_code_update(&health_thread_cmd);
1700 return ret;
1701 }
1702
1703 /*
1704 * Free and clean all traceable apps of the global list.
1705 */
1706 void ust_app_clean_list(void)
1707 {
1708 int ret;
1709 struct ust_app *app;
1710 struct lttng_ht_iter iter;
1711
1712 DBG2("UST app cleaning registered apps hash table");
1713
1714 rcu_read_lock();
1715
1716 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1717 ret = lttng_ht_del(ust_app_ht, &iter);
1718 assert(!ret);
1719 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
1720 }
1721
1722 /* Cleanup socket hash table */
1723 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1724 sock_n.node) {
1725 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1726 assert(!ret);
1727 }
1728
1729 /* Destroy is done only when the ht is empty */
1730 lttng_ht_destroy(ust_app_ht);
1731 lttng_ht_destroy(ust_app_ht_by_sock);
1732
1733 rcu_read_unlock();
1734 }
1735
1736 /*
1737 * Init UST app hash table.
1738 */
1739 void ust_app_ht_alloc(void)
1740 {
1741 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1742 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1743 }
1744
1745 /*
1746 * For a specific UST session, disable the channel for all registered apps.
1747 */
1748 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1749 struct ltt_ust_channel *uchan)
1750 {
1751 int ret = 0;
1752 struct lttng_ht_iter iter;
1753 struct lttng_ht_node_str *ua_chan_node;
1754 struct ust_app *app;
1755 struct ust_app_session *ua_sess;
1756 struct ust_app_channel *ua_chan;
1757
1758 if (usess == NULL || uchan == NULL) {
1759 ERR("Disabling UST global channel with NULL values");
1760 ret = -1;
1761 goto error;
1762 }
1763
1764 DBG2("UST app disabling channel %s from global domain for session id %d",
1765 uchan->name, usess->id);
1766
1767 rcu_read_lock();
1768
1769 /* For every registered applications */
1770 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1771 struct lttng_ht_iter uiter;
1772 if (!app->compatible) {
1773 /*
1774 * TODO: In time, we should notice the caller of this error by
1775 * telling him that this is a version error.
1776 */
1777 continue;
1778 }
1779 ua_sess = lookup_session_by_app(usess, app);
1780 if (ua_sess == NULL) {
1781 continue;
1782 }
1783
1784 /* Get channel */
1785 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1786 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1787 /* If the session if found for the app, the channel must be there */
1788 assert(ua_chan_node);
1789
1790 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1791 /* The channel must not be already disabled */
1792 assert(ua_chan->enabled == 1);
1793
1794 /* Disable channel onto application */
1795 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1796 if (ret < 0) {
1797 /* XXX: We might want to report this error at some point... */
1798 continue;
1799 }
1800 }
1801
1802 rcu_read_unlock();
1803
1804 error:
1805 return ret;
1806 }
1807
1808 /*
1809 * For a specific UST session, enable the channel for all registered apps.
1810 */
1811 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1812 struct ltt_ust_channel *uchan)
1813 {
1814 int ret = 0;
1815 struct lttng_ht_iter iter;
1816 struct ust_app *app;
1817 struct ust_app_session *ua_sess;
1818
1819 if (usess == NULL || uchan == NULL) {
1820 ERR("Adding UST global channel to NULL values");
1821 ret = -1;
1822 goto error;
1823 }
1824
1825 DBG2("UST app enabling channel %s to global domain for session id %d",
1826 uchan->name, usess->id);
1827
1828 rcu_read_lock();
1829
1830 /* For every registered applications */
1831 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1832 if (!app->compatible) {
1833 /*
1834 * TODO: In time, we should notice the caller of this error by
1835 * telling him that this is a version error.
1836 */
1837 continue;
1838 }
1839 ua_sess = lookup_session_by_app(usess, app);
1840 if (ua_sess == NULL) {
1841 continue;
1842 }
1843
1844 /* Enable channel onto application */
1845 ret = enable_ust_app_channel(ua_sess, uchan, app);
1846 if (ret < 0) {
1847 /* XXX: We might want to report this error at some point... */
1848 continue;
1849 }
1850 }
1851
1852 rcu_read_unlock();
1853
1854 error:
1855 return ret;
1856 }
1857
1858 /*
1859 * Disable an event in a channel and for a specific session.
1860 */
1861 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1862 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1863 {
1864 int ret = 0;
1865 struct lttng_ht_iter iter, uiter;
1866 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1867 struct ust_app *app;
1868 struct ust_app_session *ua_sess;
1869 struct ust_app_channel *ua_chan;
1870 struct ust_app_event *ua_event;
1871
1872 DBG("UST app disabling event %s for all apps in channel "
1873 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1874
1875 rcu_read_lock();
1876
1877 /* For all registered applications */
1878 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1879 if (!app->compatible) {
1880 /*
1881 * TODO: In time, we should notice the caller of this error by
1882 * telling him that this is a version error.
1883 */
1884 continue;
1885 }
1886 ua_sess = lookup_session_by_app(usess, app);
1887 if (ua_sess == NULL) {
1888 /* Next app */
1889 continue;
1890 }
1891
1892 /* Lookup channel in the ust app session */
1893 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1894 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1895 if (ua_chan_node == NULL) {
1896 DBG2("Channel %s not found in session id %d for app pid %d."
1897 "Skipping", uchan->name, usess->id, app->pid);
1898 continue;
1899 }
1900 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1901
1902 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1903 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1904 if (ua_event_node == NULL) {
1905 DBG2("Event %s not found in channel %s for app pid %d."
1906 "Skipping", uevent->attr.name, uchan->name, app->pid);
1907 continue;
1908 }
1909 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1910
1911 ret = disable_ust_app_event(ua_sess, ua_event, app);
1912 if (ret < 0) {
1913 /* XXX: Report error someday... */
1914 continue;
1915 }
1916 }
1917
1918 rcu_read_unlock();
1919
1920 return ret;
1921 }
1922
1923 /*
1924 * For a specific UST session and UST channel, the event for all
1925 * registered apps.
1926 */
1927 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1928 struct ltt_ust_channel *uchan)
1929 {
1930 int ret = 0;
1931 struct lttng_ht_iter iter, uiter;
1932 struct lttng_ht_node_str *ua_chan_node;
1933 struct ust_app *app;
1934 struct ust_app_session *ua_sess;
1935 struct ust_app_channel *ua_chan;
1936 struct ust_app_event *ua_event;
1937
1938 DBG("UST app disabling all event for all apps in channel "
1939 "%s for session id %d", uchan->name, usess->id);
1940
1941 rcu_read_lock();
1942
1943 /* For all registered applications */
1944 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1945 if (!app->compatible) {
1946 /*
1947 * TODO: In time, we should notice the caller of this error by
1948 * telling him that this is a version error.
1949 */
1950 continue;
1951 }
1952 ua_sess = lookup_session_by_app(usess, app);
1953 /* If ua_sess is NULL, there is a code flow error */
1954 assert(ua_sess);
1955
1956 /* Lookup channel in the ust app session */
1957 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1958 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1959 /* If the channel is not found, there is a code flow error */
1960 assert(ua_chan_node);
1961
1962 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1963
1964 /* Disable each events of channel */
1965 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1966 node.node) {
1967 ret = disable_ust_app_event(ua_sess, ua_event, app);
1968 if (ret < 0) {
1969 /* XXX: Report error someday... */
1970 continue;
1971 }
1972 }
1973 }
1974
1975 rcu_read_unlock();
1976
1977 return ret;
1978 }
1979
1980 /*
1981 * For a specific UST session, create the channel for all registered apps.
1982 */
1983 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1984 struct ltt_ust_channel *uchan)
1985 {
1986 struct lttng_ht_iter iter;
1987 struct ust_app *app;
1988 struct ust_app_session *ua_sess;
1989 struct ust_app_channel *ua_chan;
1990
1991 /* Very wrong code flow */
1992 assert(usess);
1993 assert(uchan);
1994
1995 DBG2("UST app adding channel %s to global domain for session id %d",
1996 uchan->name, usess->id);
1997
1998 rcu_read_lock();
1999
2000 /* For every registered applications */
2001 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2002 if (!app->compatible) {
2003 /*
2004 * TODO: In time, we should notice the caller of this error by
2005 * telling him that this is a version error.
2006 */
2007 continue;
2008 }
2009 /*
2010 * Create session on the tracer side and add it to app session HT. Note
2011 * that if session exist, it will simply return a pointer to the ust
2012 * app session.
2013 */
2014 ua_sess = create_ust_app_session(usess, app);
2015 if (ua_sess == NULL) {
2016 /* The malloc() failed. */
2017 goto error;
2018 } else if (ua_sess == (void *) -1UL) {
2019 /* The application's socket is not valid. Contiuing */
2020 continue;
2021 }
2022
2023 /* Create channel onto application */
2024 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2025 if (ua_chan == NULL) {
2026 /* Major problem here and it's maybe the tracer or malloc() */
2027 goto error;
2028 }
2029 }
2030
2031 rcu_read_unlock();
2032
2033 return 0;
2034
2035 error:
2036 return -1;
2037 }
2038
2039 /*
2040 * Enable event for a specific session and channel on the tracer.
2041 */
2042 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
2043 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2044 {
2045 int ret = 0;
2046 struct lttng_ht_iter iter, uiter;
2047 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2048 struct ust_app *app;
2049 struct ust_app_session *ua_sess;
2050 struct ust_app_channel *ua_chan;
2051 struct ust_app_event *ua_event;
2052
2053 DBG("UST app enabling event %s for all apps for session id %d",
2054 uevent->attr.name, usess->id);
2055
2056 /*
2057 * NOTE: At this point, this function is called only if the session and
2058 * channel passed are already created for all apps. and enabled on the
2059 * tracer also.
2060 */
2061
2062 rcu_read_lock();
2063
2064 /* For all registered applications */
2065 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2066 if (!app->compatible) {
2067 /*
2068 * TODO: In time, we should notice the caller of this error by
2069 * telling him that this is a version error.
2070 */
2071 continue;
2072 }
2073 ua_sess = lookup_session_by_app(usess, app);
2074 /* If ua_sess is NULL, there is a code flow error */
2075 assert(ua_sess);
2076
2077 /* Lookup channel in the ust app session */
2078 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2079 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2080 /* If the channel is not found, there is a code flow error */
2081 assert(ua_chan_node);
2082
2083 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2084
2085 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2086 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2087 if (ua_event_node == NULL) {
2088 DBG3("UST app enable event %s not found for app PID %d."
2089 "Skipping app", uevent->attr.name, app->pid);
2090 continue;
2091 }
2092 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2093
2094 ret = enable_ust_app_event(ua_sess, ua_event, app);
2095 if (ret < 0) {
2096 goto error;
2097 }
2098 }
2099
2100 error:
2101 rcu_read_unlock();
2102 return ret;
2103 }
2104
2105 /*
2106 * For a specific existing UST session and UST channel, creates the event for
2107 * all registered apps.
2108 */
2109 int ust_app_create_event_glb(struct ltt_ust_session *usess,
2110 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2111 {
2112 int ret = 0;
2113 struct lttng_ht_iter iter, uiter;
2114 struct lttng_ht_node_str *ua_chan_node;
2115 struct ust_app *app;
2116 struct ust_app_session *ua_sess;
2117 struct ust_app_channel *ua_chan;
2118
2119 DBG("UST app creating event %s for all apps for session id %d",
2120 uevent->attr.name, usess->id);
2121
2122 rcu_read_lock();
2123
2124 /* For all registered applications */
2125 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2126 if (!app->compatible) {
2127 /*
2128 * TODO: In time, we should notice the caller of this error by
2129 * telling him that this is a version error.
2130 */
2131 continue;
2132 }
2133 ua_sess = lookup_session_by_app(usess, app);
2134 /* If ua_sess is NULL, there is a code flow error */
2135 assert(ua_sess);
2136
2137 /* Lookup channel in the ust app session */
2138 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2139 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2140 /* If the channel is not found, there is a code flow error */
2141 assert(ua_chan_node);
2142
2143 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2144
2145 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2146 if (ret < 0) {
2147 if (ret != -EEXIST) {
2148 /* Possible value at this point: -ENOMEM. If so, we stop! */
2149 break;
2150 }
2151 DBG2("UST app event %s already exist on app PID %d",
2152 uevent->attr.name, app->pid);
2153 continue;
2154 }
2155 }
2156
2157 rcu_read_unlock();
2158
2159 return ret;
2160 }
2161
2162 /*
2163 * Start tracing for a specific UST session and app.
2164 */
2165 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
2166 {
2167 int ret = 0;
2168 struct lttng_ht_iter iter;
2169 struct ust_app_session *ua_sess;
2170 struct ust_app_channel *ua_chan;
2171 struct ltt_ust_stream *ustream;
2172 struct consumer_socket *socket;
2173
2174 DBG("Starting tracing for ust app pid %d", app->pid);
2175
2176 rcu_read_lock();
2177
2178 if (!app->compatible) {
2179 goto end;
2180 }
2181
2182 ua_sess = lookup_session_by_app(usess, app);
2183 if (ua_sess == NULL) {
2184 goto error_rcu_unlock;
2185 }
2186
2187 /* Upon restart, we skip the setup, already done */
2188 if (ua_sess->started) {
2189 goto skip_setup;
2190 }
2191
2192 /* Create directories if consumer is LOCAL and has a path defined. */
2193 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2194 strlen(usess->consumer->dst.trace_path) > 0) {
2195 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2196 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2197 if (ret < 0) {
2198 if (ret != -EEXIST) {
2199 ERR("Trace directory creation error");
2200 ret = -1;
2201 goto error_rcu_unlock;
2202 }
2203 }
2204 }
2205
2206 /* Indicate that the session has been started once */
2207 ua_sess->started = 1;
2208
2209 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2210 if (ret < 0) {
2211 ret = LTTNG_ERR_UST_META_FAIL;
2212 goto error_rcu_unlock;
2213 }
2214
2215 /* For each channel */
2216 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2217 node.node) {
2218 /* Create all streams */
2219 while (1) {
2220 /* Create UST stream */
2221 ustream = zmalloc(sizeof(*ustream));
2222 if (ustream == NULL) {
2223 PERROR("zmalloc ust stream");
2224 goto error_rcu_unlock;
2225 }
2226
2227 /* We are going to receive 2 fds, we need to reserve them. */
2228 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2229 if (ret < 0) {
2230 ERR("Exhausted number of available FD upon stream create");
2231 free(ustream);
2232 goto error_rcu_unlock;
2233 }
2234
2235 health_code_update(&health_thread_cmd);
2236
2237 ret = ustctl_create_stream(app->sock, ua_chan->obj,
2238 &ustream->obj);
2239 if (ret < 0) {
2240 /* Got all streams */
2241 lttng_fd_put(LTTNG_FD_APPS, 2);
2242 free(ustream);
2243 ret = LTTNG_ERR_UST_STREAM_FAIL;
2244 break;
2245 }
2246 ustream->handle = ustream->obj->handle;
2247
2248 health_code_update(&health_thread_cmd);
2249
2250 /* Order is important */
2251 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
2252 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2253 ua_chan->name, ua_chan->streams.count);
2254 ua_chan->streams.count++;
2255 if (ret < 0) {
2256 PERROR("asprintf UST create stream");
2257 /*
2258 * XXX what should we do here with the
2259 * stream ?
2260 */
2261 continue;
2262 }
2263 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2264 ustream->handle);
2265 }
2266
2267 health_code_update(&health_thread_cmd);
2268 }
2269
2270 switch (app->bits_per_long) {
2271 case 64:
2272 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2273 usess->consumer);
2274 if (socket == NULL) {
2275 goto skip_setup;
2276 }
2277 break;
2278 case 32:
2279 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2280 usess->consumer);
2281 if (socket == NULL) {
2282 goto skip_setup;
2283 }
2284 break;
2285 default:
2286 ret = -EINVAL;
2287 goto error_rcu_unlock;
2288 }
2289
2290 /* Setup UST consumer socket and send fds to it */
2291 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
2292 if (ret < 0) {
2293 goto error_rcu_unlock;
2294 }
2295
2296 health_code_update(&health_thread_cmd);
2297
2298 skip_setup:
2299 /* This start the UST tracing */
2300 ret = ustctl_start_session(app->sock, ua_sess->handle);
2301 if (ret < 0) {
2302 ERR("Error starting tracing for app pid: %d", app->pid);
2303 goto error_rcu_unlock;
2304 }
2305
2306 health_code_update(&health_thread_cmd);
2307
2308 /* Quiescent wait after starting trace */
2309 ustctl_wait_quiescent(app->sock);
2310
2311 end:
2312 rcu_read_unlock();
2313 health_code_update(&health_thread_cmd);
2314 return 0;
2315
2316 error_rcu_unlock:
2317 rcu_read_unlock();
2318 health_code_update(&health_thread_cmd);
2319 return -1;
2320 }
2321
2322 /*
2323 * Stop tracing for a specific UST session and app.
2324 */
2325 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2326 {
2327 int ret = 0;
2328 struct lttng_ht_iter iter;
2329 struct ust_app_session *ua_sess;
2330 struct ust_app_channel *ua_chan;
2331
2332 DBG("Stopping tracing for ust app pid %d", app->pid);
2333
2334 rcu_read_lock();
2335
2336 if (!app->compatible) {
2337 goto end;
2338 }
2339
2340 ua_sess = lookup_session_by_app(usess, app);
2341 if (ua_sess == NULL) {
2342 /* Only malloc can failed so something is really wrong */
2343 goto error_rcu_unlock;
2344 }
2345
2346 /*
2347 * If started = 0, it means that stop trace has been called for a session
2348 * that was never started. This is a code flow error and should never
2349 * happen.
2350 */
2351 assert(ua_sess->started == 1);
2352
2353 health_code_update(&health_thread_cmd);
2354
2355 /* This inhibits UST tracing */
2356 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2357 if (ret < 0) {
2358 ERR("Error stopping tracing for app pid: %d", app->pid);
2359 goto error_rcu_unlock;
2360 }
2361
2362 health_code_update(&health_thread_cmd);
2363
2364 /* Quiescent wait after stopping trace */
2365 ustctl_wait_quiescent(app->sock);
2366
2367 health_code_update(&health_thread_cmd);
2368
2369 /* Flushing buffers */
2370 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2371 node.node) {
2372 health_code_update(&health_thread_cmd);
2373 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2374 if (ret < 0) {
2375 ERR("UST app PID %d channel %s flush failed with ret %d",
2376 app->pid, ua_chan->name, ret);
2377 /* Continuing flushing all buffers */
2378 continue;
2379 }
2380 }
2381
2382 health_code_update(&health_thread_cmd);
2383
2384 /* Flush all buffers before stopping */
2385 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2386 if (ret < 0) {
2387 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2388 ret);
2389 }
2390
2391 end:
2392 rcu_read_unlock();
2393 health_code_update(&health_thread_cmd);
2394 return 0;
2395
2396 error_rcu_unlock:
2397 rcu_read_unlock();
2398 health_code_update(&health_thread_cmd);
2399 return -1;
2400 }
2401
2402 /*
2403 * Destroy a specific UST session in apps.
2404 */
2405 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2406 {
2407 struct ust_app_session *ua_sess;
2408 struct lttng_ust_object_data obj;
2409 struct lttng_ht_iter iter;
2410 struct lttng_ht_node_ulong *node;
2411 int ret;
2412
2413 DBG("Destroy tracing for ust app pid %d", app->pid);
2414
2415 rcu_read_lock();
2416
2417 if (!app->compatible) {
2418 goto end;
2419 }
2420
2421 __lookup_session_by_app(usess, app, &iter);
2422 node = lttng_ht_iter_get_node_ulong(&iter);
2423 if (node == NULL) {
2424 /* Only malloc can failed so something is really wrong */
2425 goto error_rcu_unlock;
2426 }
2427 ua_sess = caa_container_of(node, struct ust_app_session, node);
2428 ret = lttng_ht_del(app->sessions, &iter);
2429 assert(!ret);
2430 obj.handle = ua_sess->handle;
2431 obj.shm_fd = -1;
2432 obj.wait_fd = -1;
2433 obj.memory_map_size = 0;
2434 health_code_update(&health_thread_cmd);
2435 ustctl_release_object(app->sock, &obj);
2436
2437 health_code_update(&health_thread_cmd);
2438 delete_ust_app_session(app->sock, ua_sess);
2439
2440 /* Quiescent wait after stopping trace */
2441 ustctl_wait_quiescent(app->sock);
2442
2443 end:
2444 rcu_read_unlock();
2445 health_code_update(&health_thread_cmd);
2446 return 0;
2447
2448 error_rcu_unlock:
2449 rcu_read_unlock();
2450 health_code_update(&health_thread_cmd);
2451 return -1;
2452 }
2453
2454 /*
2455 * Start tracing for the UST session.
2456 */
2457 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2458 {
2459 int ret = 0;
2460 struct lttng_ht_iter iter;
2461 struct ust_app *app;
2462
2463 DBG("Starting all UST traces");
2464
2465 rcu_read_lock();
2466
2467 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2468 ret = ust_app_start_trace(usess, app);
2469 if (ret < 0) {
2470 /* Continue to next apps even on error */
2471 continue;
2472 }
2473 }
2474
2475 rcu_read_unlock();
2476
2477 return 0;
2478 }
2479
2480 /*
2481 * Start tracing for the UST session.
2482 */
2483 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2484 {
2485 int ret = 0;
2486 struct lttng_ht_iter iter;
2487 struct ust_app *app;
2488
2489 DBG("Stopping all UST traces");
2490
2491 rcu_read_lock();
2492
2493 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2494 ret = ust_app_stop_trace(usess, app);
2495 if (ret < 0) {
2496 /* Continue to next apps even on error */
2497 continue;
2498 }
2499 }
2500
2501 rcu_read_unlock();
2502
2503 return 0;
2504 }
2505
2506 /*
2507 * Destroy app UST session.
2508 */
2509 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2510 {
2511 int ret = 0;
2512 struct lttng_ht_iter iter;
2513 struct ust_app *app;
2514
2515 DBG("Destroy all UST traces");
2516
2517 rcu_read_lock();
2518
2519 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2520 ret = ust_app_destroy_trace(usess, app);
2521 if (ret < 0) {
2522 /* Continue to next apps even on error */
2523 continue;
2524 }
2525 }
2526
2527 rcu_read_unlock();
2528
2529 return 0;
2530 }
2531
2532 /*
2533 * Add channels/events from UST global domain to registered apps at sock.
2534 */
2535 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2536 {
2537 int ret = 0;
2538 struct lttng_ht_iter iter, uiter, iter_ctx;
2539 struct ust_app *app;
2540 struct ust_app_session *ua_sess;
2541 struct ust_app_channel *ua_chan;
2542 struct ust_app_event *ua_event;
2543 struct ust_app_ctx *ua_ctx;
2544
2545 if (usess == NULL) {
2546 ERR("No UST session on global update. Returning");
2547 goto error;
2548 }
2549
2550 DBG2("UST app global update for app sock %d for session id %d", sock,
2551 usess->id);
2552
2553 rcu_read_lock();
2554
2555 app = find_app_by_sock(sock);
2556 if (app == NULL) {
2557 ERR("Failed to update app sock %d", sock);
2558 goto error;
2559 }
2560
2561 if (!app->compatible) {
2562 goto error;
2563 }
2564
2565 ua_sess = create_ust_app_session(usess, app);
2566 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2567 /* Tracer is gone for this session and has been freed */
2568 goto error;
2569 }
2570
2571 /*
2572 * We can iterate safely here over all UST app session sicne the create ust
2573 * app session above made a shadow copy of the UST global domain from the
2574 * ltt ust session.
2575 */
2576 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2577 node.node) {
2578 ret = create_ust_channel(app, ua_sess, ua_chan);
2579 if (ret < 0) {
2580 /* FIXME: Should we quit here or continue... */
2581 continue;
2582 }
2583
2584 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2585 node.node) {
2586 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2587 if (ret < 0) {
2588 /* FIXME: Should we quit here or continue... */
2589 continue;
2590 }
2591 }
2592
2593
2594 /* For each events */
2595 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2596 node.node) {
2597 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2598 if (ret < 0) {
2599 /* FIXME: Should we quit here or continue... */
2600 continue;
2601 }
2602
2603 /* Add context on events. */
2604 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2605 ua_ctx, node.node) {
2606 ret = create_ust_event_context(ua_event, ua_ctx, app);
2607 if (ret < 0) {
2608 /* FIXME: Should we quit here or continue... */
2609 continue;
2610 }
2611 }
2612 ret = set_ust_event_filter(ua_event, app);
2613 if (ret < 0) {
2614 /* FIXME: Should we quit here or continue... */
2615 continue;
2616 }
2617 }
2618 }
2619
2620 if (usess->start_trace) {
2621 ret = ust_app_start_trace(usess, app);
2622 if (ret < 0) {
2623 goto error;
2624 }
2625
2626 DBG2("UST trace started for app pid %d", app->pid);
2627 }
2628
2629 error:
2630 rcu_read_unlock();
2631 return;
2632 }
2633
2634 /*
2635 * Add context to a specific channel for global UST domain.
2636 */
2637 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2638 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2639 {
2640 int ret = 0;
2641 struct lttng_ht_node_str *ua_chan_node;
2642 struct lttng_ht_iter iter, uiter;
2643 struct ust_app_channel *ua_chan = NULL;
2644 struct ust_app_session *ua_sess;
2645 struct ust_app *app;
2646
2647 rcu_read_lock();
2648
2649 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2650 if (!app->compatible) {
2651 /*
2652 * TODO: In time, we should notice the caller of this error by
2653 * telling him that this is a version error.
2654 */
2655 continue;
2656 }
2657 ua_sess = lookup_session_by_app(usess, app);
2658 if (ua_sess == NULL) {
2659 continue;
2660 }
2661
2662 /* Lookup channel in the ust app session */
2663 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2664 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2665 if (ua_chan_node == NULL) {
2666 continue;
2667 }
2668 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2669 node);
2670
2671 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2672 if (ret < 0) {
2673 continue;
2674 }
2675 }
2676
2677 rcu_read_unlock();
2678 return ret;
2679 }
2680
2681 /*
2682 * Add context to a specific event in a channel for global UST domain.
2683 */
2684 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2685 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2686 struct ltt_ust_context *uctx)
2687 {
2688 int ret = 0;
2689 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2690 struct lttng_ht_iter iter, uiter;
2691 struct ust_app_session *ua_sess;
2692 struct ust_app_event *ua_event;
2693 struct ust_app_channel *ua_chan = NULL;
2694 struct ust_app *app;
2695
2696 rcu_read_lock();
2697
2698 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2699 if (!app->compatible) {
2700 /*
2701 * TODO: In time, we should notice the caller of this error by
2702 * telling him that this is a version error.
2703 */
2704 continue;
2705 }
2706 ua_sess = lookup_session_by_app(usess, app);
2707 if (ua_sess == NULL) {
2708 continue;
2709 }
2710
2711 /* Lookup channel in the ust app session */
2712 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2713 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2714 if (ua_chan_node == NULL) {
2715 continue;
2716 }
2717 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2718 node);
2719
2720 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2721 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2722 if (ua_event_node == NULL) {
2723 continue;
2724 }
2725 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2726 node);
2727
2728 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2729 if (ret < 0) {
2730 continue;
2731 }
2732 }
2733
2734 rcu_read_unlock();
2735 return ret;
2736 }
2737
2738 /*
2739 * Add context to a specific event in a channel for global UST domain.
2740 */
2741 int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2742 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2743 struct lttng_filter_bytecode *bytecode)
2744 {
2745 int ret = 0;
2746 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2747 struct lttng_ht_iter iter, uiter;
2748 struct ust_app_session *ua_sess;
2749 struct ust_app_event *ua_event;
2750 struct ust_app_channel *ua_chan = NULL;
2751 struct ust_app *app;
2752
2753 rcu_read_lock();
2754
2755 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2756 if (!app->compatible) {
2757 /*
2758 * TODO: In time, we should notice the caller of this error by
2759 * telling him that this is a version error.
2760 */
2761 continue;
2762 }
2763 ua_sess = lookup_session_by_app(usess, app);
2764 if (ua_sess == NULL) {
2765 continue;
2766 }
2767
2768 /* Lookup channel in the ust app session */
2769 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2770 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2771 if (ua_chan_node == NULL) {
2772 continue;
2773 }
2774 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2775 node);
2776
2777 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2778 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2779 if (ua_event_node == NULL) {
2780 continue;
2781 }
2782 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2783 node);
2784
2785 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2786 if (ret < 0) {
2787 continue;
2788 }
2789 }
2790
2791 rcu_read_unlock();
2792 return ret;
2793 }
2794
2795 /*
2796 * Enable event for a channel from a UST session for a specific PID.
2797 */
2798 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2799 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2800 {
2801 int ret = 0;
2802 struct lttng_ht_iter iter;
2803 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2804 struct ust_app *app;
2805 struct ust_app_session *ua_sess;
2806 struct ust_app_channel *ua_chan;
2807 struct ust_app_event *ua_event;
2808
2809 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2810
2811 rcu_read_lock();
2812
2813 app = ust_app_find_by_pid(pid);
2814 if (app == NULL) {
2815 ERR("UST app enable event per PID %d not found", pid);
2816 ret = -1;
2817 goto error;
2818 }
2819
2820 if (!app->compatible) {
2821 ret = 0;
2822 goto error;
2823 }
2824
2825 ua_sess = lookup_session_by_app(usess, app);
2826 /* If ua_sess is NULL, there is a code flow error */
2827 assert(ua_sess);
2828
2829 /* Lookup channel in the ust app session */
2830 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2831 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2832 /* If the channel is not found, there is a code flow error */
2833 assert(ua_chan_node);
2834
2835 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2836
2837 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2838 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2839 if (ua_event_node == NULL) {
2840 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2841 if (ret < 0) {
2842 goto error;
2843 }
2844 } else {
2845 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2846
2847 ret = enable_ust_app_event(ua_sess, ua_event, app);
2848 if (ret < 0) {
2849 goto error;
2850 }
2851 }
2852
2853 error:
2854 rcu_read_unlock();
2855 return ret;
2856 }
2857
2858 /*
2859 * Disable event for a channel from a UST session for a specific PID.
2860 */
2861 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2862 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2863 {
2864 int ret = 0;
2865 struct lttng_ht_iter iter;
2866 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2867 struct ust_app *app;
2868 struct ust_app_session *ua_sess;
2869 struct ust_app_channel *ua_chan;
2870 struct ust_app_event *ua_event;
2871
2872 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2873
2874 rcu_read_lock();
2875
2876 app = ust_app_find_by_pid(pid);
2877 if (app == NULL) {
2878 ERR("UST app disable event per PID %d not found", pid);
2879 ret = -1;
2880 goto error;
2881 }
2882
2883 if (!app->compatible) {
2884 ret = 0;
2885 goto error;
2886 }
2887
2888 ua_sess = lookup_session_by_app(usess, app);
2889 /* If ua_sess is NULL, there is a code flow error */
2890 assert(ua_sess);
2891
2892 /* Lookup channel in the ust app session */
2893 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2894 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2895 if (ua_chan_node == NULL) {
2896 /* Channel does not exist, skip disabling */
2897 goto error;
2898 }
2899 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2900
2901 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2902 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2903 if (ua_event_node == NULL) {
2904 /* Event does not exist, skip disabling */
2905 goto error;
2906 }
2907 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2908
2909 ret = disable_ust_app_event(ua_sess, ua_event, app);
2910 if (ret < 0) {
2911 goto error;
2912 }
2913
2914 error:
2915 rcu_read_unlock();
2916 return ret;
2917 }
2918
2919 /*
2920 * Validate version of UST apps and set the compatible bit.
2921 */
2922 int ust_app_validate_version(int sock)
2923 {
2924 int ret;
2925 struct ust_app *app;
2926
2927 rcu_read_lock();
2928
2929 app = find_app_by_sock(sock);
2930 assert(app);
2931
2932 health_code_update(&health_thread_cmd);
2933
2934 ret = ustctl_tracer_version(sock, &app->version);
2935 if (ret < 0) {
2936 goto error;
2937 }
2938
2939 /* Validate version */
2940 if (app->version.major != UST_APP_MAJOR_VERSION) {
2941 goto error;
2942 }
2943
2944 DBG2("UST app PID %d is compatible with internal major version %d "
2945 "(supporting == %d)", app->pid, app->version.major,
2946 UST_APP_MAJOR_VERSION);
2947 app->compatible = 1;
2948 rcu_read_unlock();
2949 health_code_update(&health_thread_cmd);
2950 return 0;
2951
2952 error:
2953 DBG2("UST app PID %d is not compatible with internal major version %d "
2954 "(supporting == %d)", app->pid, app->version.major,
2955 UST_APP_MAJOR_VERSION);
2956 app->compatible = 0;
2957 rcu_read_unlock();
2958 health_code_update(&health_thread_cmd);
2959 return -1;
2960 }
2961
2962 /*
2963 * Calibrate registered applications.
2964 */
2965 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2966 {
2967 int ret = 0;
2968 struct lttng_ht_iter iter;
2969 struct ust_app *app;
2970
2971 rcu_read_lock();
2972
2973 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2974 if (!app->compatible) {
2975 /*
2976 * TODO: In time, we should notice the caller of this error by
2977 * telling him that this is a version error.
2978 */
2979 continue;
2980 }
2981
2982 health_code_update(&health_thread_cmd);
2983
2984 ret = ustctl_calibrate(app->sock, calibrate);
2985 if (ret < 0) {
2986 switch (ret) {
2987 case -ENOSYS:
2988 /* Means that it's not implemented on the tracer side. */
2989 ret = 0;
2990 break;
2991 default:
2992 /* TODO: Report error to user */
2993 DBG2("Calibrate app PID %d returned with error %d",
2994 app->pid, ret);
2995 break;
2996 }
2997 }
2998 }
2999
3000 DBG("UST app global domain calibration finished");
3001
3002 rcu_read_unlock();
3003
3004 health_code_update(&health_thread_cmd);
3005
3006 return ret;
3007 }
LTTng 2.0 tools and control repository
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