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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 #include <lttng/ust-error.h>
29
30 #include <common/common.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
32
33 #include "fd-limit.h"
34 #include "health.h"
35 #include "ust-app.h"
36 #include "ust-consumer.h"
37 #include "ust-ctl.h"
38
39 static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
40 {
41 struct ust_app_event *event;
42 const struct ust_app_ht_key *key;
43
44 assert(node);
45 assert(_key);
46
47 event = caa_container_of(node, struct ust_app_event, node.node);
48 key = _key;
49
50 /* Match the 3 elements of the key: name, filter and loglevel. */
51
52 /* Event name */
53 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
54 goto no_match;
55 }
56
57 /* Event loglevel. */
58 if (event->attr.loglevel != key->loglevel) {
59 goto no_match;
60 }
61
62 /* One of the filters is NULL, fail. */
63 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
64 goto no_match;
65 }
66
67 /* Both filters are NULL, success. */
68 if (!key->filter && !event->filter) {
69 goto match;
70 }
71
72 /* Both filters exists, check length followed by the bytecode. */
73 if (event->filter->len == key->filter->len &&
74 memcmp(event->filter->data, key->filter->data,
75 event->filter->len) == 0) {
76 goto match;
77 }
78
79 match:
80 return 1;
81
82 no_match:
83 return 0;
84
85 }
86
87 static void add_unique_ust_app_event(struct lttng_ht *ht,
88 struct ust_app_event *event)
89 {
90 struct cds_lfht_node *node_ptr;
91 struct ust_app_ht_key key;
92
93 assert(ht);
94 assert(ht->ht);
95 assert(event);
96
97 key.name = event->attr.name;
98 key.filter = event->filter;
99 key.loglevel = event->attr.loglevel;
100
101 node_ptr = cds_lfht_add_unique(ht->ht,
102 ht->hash_fct(event->node.key, lttng_ht_seed),
103 ht_match_ust_app_event, &key, &event->node.node);
104 assert(node_ptr == &event->node.node);
105 }
106
107 /*
108 * Delete ust context safely. RCU read lock must be held before calling
109 * this function.
110 */
111 static
112 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
113 {
114 if (ua_ctx->obj) {
115 ustctl_release_object(sock, ua_ctx->obj);
116 free(ua_ctx->obj);
117 }
118 free(ua_ctx);
119 }
120
121 /*
122 * Delete ust app event safely. RCU read lock must be held before calling
123 * this function.
124 */
125 static
126 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
127 {
128 free(ua_event->filter);
129
130 if (ua_event->obj != NULL) {
131 ustctl_release_object(sock, ua_event->obj);
132 free(ua_event->obj);
133 }
134 free(ua_event);
135 }
136
137 /*
138 * Delete ust app stream safely. RCU read lock must be held before calling
139 * this function.
140 */
141 static
142 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
143 {
144 if (stream->obj) {
145 ustctl_release_object(sock, stream->obj);
146 lttng_fd_put(LTTNG_FD_APPS, 2);
147 free(stream->obj);
148 }
149 free(stream);
150 }
151
152 /*
153 * Delete ust app channel safely. RCU read lock must be held before calling
154 * this function.
155 */
156 static
157 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
158 {
159 int ret;
160 struct lttng_ht_iter iter;
161 struct ust_app_event *ua_event;
162 struct ust_app_ctx *ua_ctx;
163 struct ltt_ust_stream *stream, *stmp;
164
165 /* Wipe stream */
166 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
167 cds_list_del(&stream->list);
168 delete_ust_app_stream(sock, stream);
169 }
170
171 /* Wipe context */
172 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
173 ret = lttng_ht_del(ua_chan->ctx, &iter);
174 assert(!ret);
175 delete_ust_app_ctx(sock, ua_ctx);
176 }
177 lttng_ht_destroy(ua_chan->ctx);
178
179 /* Wipe events */
180 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
181 node.node) {
182 ret = lttng_ht_del(ua_chan->events, &iter);
183 assert(!ret);
184 delete_ust_app_event(sock, ua_event);
185 }
186 lttng_ht_destroy(ua_chan->events);
187
188 if (ua_chan->obj != NULL) {
189 ustctl_release_object(sock, ua_chan->obj);
190 lttng_fd_put(LTTNG_FD_APPS, 2);
191 free(ua_chan->obj);
192 }
193 free(ua_chan);
194 }
195
196 /*
197 * Delete ust app session safely. RCU read lock must be held before calling
198 * this function.
199 */
200 static
201 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
202 {
203 int ret;
204 struct lttng_ht_iter iter;
205 struct ust_app_channel *ua_chan;
206
207 if (ua_sess->metadata) {
208 if (ua_sess->metadata->stream_obj) {
209 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
210 lttng_fd_put(LTTNG_FD_APPS, 2);
211 free(ua_sess->metadata->stream_obj);
212 }
213 if (ua_sess->metadata->obj) {
214 ustctl_release_object(sock, ua_sess->metadata->obj);
215 lttng_fd_put(LTTNG_FD_APPS, 2);
216 free(ua_sess->metadata->obj);
217 }
218 trace_ust_destroy_metadata(ua_sess->metadata);
219 }
220
221 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
222 node.node) {
223 ret = lttng_ht_del(ua_sess->channels, &iter);
224 assert(!ret);
225 delete_ust_app_channel(sock, ua_chan);
226 }
227 lttng_ht_destroy(ua_sess->channels);
228
229 if (ua_sess->handle != -1) {
230 ustctl_release_handle(sock, ua_sess->handle);
231 }
232 free(ua_sess);
233 }
234
235 /*
236 * Delete a traceable application structure from the global list. Never call
237 * this function outside of a call_rcu call.
238 */
239 static
240 void delete_ust_app(struct ust_app *app)
241 {
242 int ret, sock;
243 struct lttng_ht_iter iter;
244 struct ust_app_session *ua_sess;
245
246 rcu_read_lock();
247
248 /* Delete ust app sessions info */
249 sock = app->sock;
250 app->sock = -1;
251
252 /* Wipe sessions */
253 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
254 node.node) {
255 ret = lttng_ht_del(app->sessions, &iter);
256 assert(!ret);
257 delete_ust_app_session(app->sock, ua_sess);
258 }
259 lttng_ht_destroy(app->sessions);
260
261 /*
262 * Wait until we have deleted the application from the sock hash table
263 * before closing this socket, otherwise an application could re-use the
264 * socket ID and race with the teardown, using the same hash table entry.
265 *
266 * It's OK to leave the close in call_rcu. We want it to stay unique for
267 * all RCU readers that could run concurrently with unregister app,
268 * therefore we _need_ to only close that socket after a grace period. So
269 * it should stay in this RCU callback.
270 *
271 * This close() is a very important step of the synchronization model so
272 * every modification to this function must be carefully reviewed.
273 */
274 ret = close(sock);
275 if (ret) {
276 PERROR("close");
277 }
278 lttng_fd_put(LTTNG_FD_APPS, 1);
279
280 DBG2("UST app pid %d deleted", app->pid);
281 free(app);
282
283 rcu_read_unlock();
284 }
285
286 /*
287 * URCU intermediate call to delete an UST app.
288 */
289 static
290 void delete_ust_app_rcu(struct rcu_head *head)
291 {
292 struct lttng_ht_node_ulong *node =
293 caa_container_of(head, struct lttng_ht_node_ulong, head);
294 struct ust_app *app =
295 caa_container_of(node, struct ust_app, pid_n);
296
297 DBG3("Call RCU deleting app PID %d", app->pid);
298 delete_ust_app(app);
299 }
300
301 /*
302 * Alloc new UST app session.
303 */
304 static
305 struct ust_app_session *alloc_ust_app_session(void)
306 {
307 struct ust_app_session *ua_sess;
308
309 /* Init most of the default value by allocating and zeroing */
310 ua_sess = zmalloc(sizeof(struct ust_app_session));
311 if (ua_sess == NULL) {
312 PERROR("malloc");
313 goto error;
314 }
315
316 ua_sess->handle = -1;
317 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
318
319 return ua_sess;
320
321 error:
322 return NULL;
323 }
324
325 /*
326 * Alloc new UST app channel.
327 */
328 static
329 struct ust_app_channel *alloc_ust_app_channel(char *name,
330 struct lttng_ust_channel *attr)
331 {
332 struct ust_app_channel *ua_chan;
333
334 /* Init most of the default value by allocating and zeroing */
335 ua_chan = zmalloc(sizeof(struct ust_app_channel));
336 if (ua_chan == NULL) {
337 PERROR("malloc");
338 goto error;
339 }
340
341 /* Setup channel name */
342 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
343 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
344
345 ua_chan->enabled = 1;
346 ua_chan->handle = -1;
347 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
348 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
349 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
350
351 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
352
353 /* Copy attributes */
354 if (attr) {
355 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
356 }
357
358 DBG3("UST app channel %s allocated", ua_chan->name);
359
360 return ua_chan;
361
362 error:
363 return NULL;
364 }
365
366 /*
367 * Alloc new UST app event.
368 */
369 static
370 struct ust_app_event *alloc_ust_app_event(char *name,
371 struct lttng_ust_event *attr)
372 {
373 struct ust_app_event *ua_event;
374
375 /* Init most of the default value by allocating and zeroing */
376 ua_event = zmalloc(sizeof(struct ust_app_event));
377 if (ua_event == NULL) {
378 PERROR("malloc");
379 goto error;
380 }
381
382 ua_event->enabled = 1;
383 strncpy(ua_event->name, name, sizeof(ua_event->name));
384 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
385 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
386
387 /* Copy attributes */
388 if (attr) {
389 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
390 }
391
392 DBG3("UST app event %s allocated", ua_event->name);
393
394 return ua_event;
395
396 error:
397 return NULL;
398 }
399
400 /*
401 * Alloc new UST app context.
402 */
403 static
404 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
405 {
406 struct ust_app_ctx *ua_ctx;
407
408 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
409 if (ua_ctx == NULL) {
410 goto error;
411 }
412
413 if (uctx) {
414 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
415 }
416
417 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
418
419 error:
420 return ua_ctx;
421 }
422
423 /*
424 * Find an ust_app using the sock and return it. RCU read side lock must be
425 * held before calling this helper function.
426 */
427 static
428 struct ust_app *find_app_by_sock(int sock)
429 {
430 struct lttng_ht_node_ulong *node;
431 struct lttng_ht_iter iter;
432
433 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
434 node = lttng_ht_iter_get_node_ulong(&iter);
435 if (node == NULL) {
436 DBG2("UST app find by sock %d not found", sock);
437 goto error;
438 }
439
440 return caa_container_of(node, struct ust_app, sock_n);
441
442 error:
443 return NULL;
444 }
445
446 static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
447 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
448 {
449 struct lttng_ht_iter iter;
450 struct lttng_ht_node_str *node;
451 struct ust_app_event *event = NULL;
452 struct ust_app_ht_key key;
453 void *orig_match_fct;
454
455 assert(name);
456 assert(ht);
457
458 /* Setup key for event lookup. */
459 key.name = name;
460 key.filter = filter;
461 key.loglevel = loglevel;
462
463 /* Save match function so we can use the ust app event match. */
464 orig_match_fct = (void *) ht->match_fct;
465 ht->match_fct = ht_match_ust_app_event;
466
467 lttng_ht_lookup(ht, (void *) &key, &iter);
468 node = lttng_ht_iter_get_node_str(&iter);
469 if (node == NULL) {
470 goto end;
471 }
472
473 event = caa_container_of(node, struct ust_app_event, node);
474
475 end:
476 /* Put back original match function. */
477 ht->match_fct = orig_match_fct;
478 return event;
479 }
480
481 /*
482 * Create the channel context on the tracer.
483 */
484 static
485 int create_ust_channel_context(struct ust_app_channel *ua_chan,
486 struct ust_app_ctx *ua_ctx, struct ust_app *app)
487 {
488 int ret;
489
490 health_code_update(&health_thread_cmd);
491
492 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
493 ua_chan->obj, &ua_ctx->obj);
494 if (ret < 0) {
495 goto error;
496 }
497
498 ua_ctx->handle = ua_ctx->obj->handle;
499
500 DBG2("UST app context created successfully for channel %s", ua_chan->name);
501
502 error:
503 health_code_update(&health_thread_cmd);
504 return ret;
505 }
506
507 /*
508 * Set the filter on the tracer.
509 */
510 static
511 int set_ust_event_filter(struct ust_app_event *ua_event,
512 struct ust_app *app)
513 {
514 int ret;
515
516 health_code_update(&health_thread_cmd);
517
518 if (!ua_event->filter) {
519 ret = 0;
520 goto error;
521 }
522
523 ret = ustctl_set_filter(app->sock, ua_event->filter,
524 ua_event->obj);
525 if (ret < 0) {
526 goto error;
527 }
528
529 DBG2("UST filter set successfully for event %s", ua_event->name);
530
531 error:
532 health_code_update(&health_thread_cmd);
533 return ret;
534 }
535
536 /*
537 * Disable the specified event on to UST tracer for the UST session.
538 */
539 static int disable_ust_event(struct ust_app *app,
540 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
541 {
542 int ret;
543
544 health_code_update(&health_thread_cmd);
545
546 ret = ustctl_disable(app->sock, ua_event->obj);
547 if (ret < 0) {
548 ERR("UST app event %s disable failed for app (pid: %d) "
549 "and session handle %d with ret %d",
550 ua_event->attr.name, app->pid, ua_sess->handle, ret);
551 goto error;
552 }
553
554 DBG2("UST app event %s disabled successfully for app (pid: %d)",
555 ua_event->attr.name, app->pid);
556
557 error:
558 health_code_update(&health_thread_cmd);
559 return ret;
560 }
561
562 /*
563 * Disable the specified channel on to UST tracer for the UST session.
564 */
565 static int disable_ust_channel(struct ust_app *app,
566 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
567 {
568 int ret;
569
570 health_code_update(&health_thread_cmd);
571
572 ret = ustctl_disable(app->sock, ua_chan->obj);
573 if (ret < 0) {
574 ERR("UST app channel %s disable failed for app (pid: %d) "
575 "and session handle %d with ret %d",
576 ua_chan->name, app->pid, ua_sess->handle, ret);
577 goto error;
578 }
579
580 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
581 ua_chan->name, app->pid);
582
583 error:
584 health_code_update(&health_thread_cmd);
585 return ret;
586 }
587
588 /*
589 * Enable the specified channel on to UST tracer for the UST session.
590 */
591 static int enable_ust_channel(struct ust_app *app,
592 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
593 {
594 int ret;
595
596 health_code_update(&health_thread_cmd);
597
598 ret = ustctl_enable(app->sock, ua_chan->obj);
599 if (ret < 0) {
600 ERR("UST app channel %s enable failed for app (pid: %d) "
601 "and session handle %d with ret %d",
602 ua_chan->name, app->pid, ua_sess->handle, ret);
603 goto error;
604 }
605
606 ua_chan->enabled = 1;
607
608 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
609 ua_chan->name, app->pid);
610
611 error:
612 health_code_update(&health_thread_cmd);
613 return ret;
614 }
615
616 /*
617 * Enable the specified event on to UST tracer for the UST session.
618 */
619 static int enable_ust_event(struct ust_app *app,
620 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
621 {
622 int ret;
623
624 health_code_update(&health_thread_cmd);
625
626 ret = ustctl_enable(app->sock, ua_event->obj);
627 if (ret < 0) {
628 ERR("UST app event %s enable failed for app (pid: %d) "
629 "and session handle %d with ret %d",
630 ua_event->attr.name, app->pid, ua_sess->handle, ret);
631 goto error;
632 }
633
634 DBG2("UST app event %s enabled successfully for app (pid: %d)",
635 ua_event->attr.name, app->pid);
636
637 error:
638 health_code_update(&health_thread_cmd);
639 return ret;
640 }
641
642 /*
643 * Open metadata onto the UST tracer for a UST session.
644 */
645 static int open_ust_metadata(struct ust_app *app,
646 struct ust_app_session *ua_sess)
647 {
648 int ret;
649 struct lttng_ust_channel_attr uattr;
650
651 health_code_update(&health_thread_cmd);
652
653 uattr.overwrite = ua_sess->metadata->attr.overwrite;
654 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
655 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
656 uattr.switch_timer_interval =
657 ua_sess->metadata->attr.switch_timer_interval;
658 uattr.read_timer_interval =
659 ua_sess->metadata->attr.read_timer_interval;
660 uattr.output = ua_sess->metadata->attr.output;
661
662 /* We are going to receive 2 fds, we need to reserve them. */
663 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
664 if (ret < 0) {
665 ERR("Exhausted number of available FD upon metadata open");
666 goto error;
667 }
668 /* UST tracer metadata creation */
669 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
670 &ua_sess->metadata->obj);
671 if (ret < 0) {
672 ERR("UST app open metadata failed for app pid:%d with ret %d",
673 app->pid, ret);
674 goto error;
675 }
676
677 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
678
679 error:
680 health_code_update(&health_thread_cmd);
681 return ret;
682 }
683
684 /*
685 * Create stream onto the UST tracer for a UST session.
686 */
687 static int create_ust_stream(struct ust_app *app,
688 struct ust_app_session *ua_sess)
689 {
690 int ret;
691
692 health_code_update(&health_thread_cmd);
693
694 /* We are going to receive 2 fds, we need to reserve them. */
695 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
696 if (ret < 0) {
697 ERR("Exhausted number of available FD upon metadata stream create");
698 goto error;
699 }
700 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
701 &ua_sess->metadata->stream_obj);
702 if (ret < 0) {
703 ERR("UST create metadata stream failed");
704 goto error;
705 }
706
707 error:
708 health_code_update(&health_thread_cmd);
709 return ret;
710 }
711
712 /*
713 * Create the specified channel onto the UST tracer for a UST session.
714 */
715 static int create_ust_channel(struct ust_app *app,
716 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
717 {
718 int ret;
719
720 health_code_update(&health_thread_cmd);
721
722 /* TODO: remove cast and use lttng-ust-abi.h */
723
724 /* We are going to receive 2 fds, we need to reserve them. */
725 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
726 if (ret < 0) {
727 ERR("Exhausted number of available FD upon create channel");
728 goto error;
729 }
730
731 health_code_update(&health_thread_cmd);
732
733 ret = ustctl_create_channel(app->sock, ua_sess->handle,
734 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
735 if (ret < 0) {
736 ERR("Creating channel %s for app (pid: %d, sock: %d) "
737 "and session handle %d with ret %d",
738 ua_chan->name, app->pid, app->sock,
739 ua_sess->handle, ret);
740 lttng_fd_put(LTTNG_FD_APPS, 2);
741 goto error;
742 }
743
744 ua_chan->handle = ua_chan->obj->handle;
745
746 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
747 ua_chan->name, app->pid, app->sock);
748
749 health_code_update(&health_thread_cmd);
750
751 /* If channel is not enabled, disable it on the tracer */
752 if (!ua_chan->enabled) {
753 ret = disable_ust_channel(app, ua_sess, ua_chan);
754 if (ret < 0) {
755 goto error;
756 }
757 }
758
759 error:
760 health_code_update(&health_thread_cmd);
761 return ret;
762 }
763
764 /*
765 * Create the specified event onto the UST tracer for a UST session.
766 */
767 static
768 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
769 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
770 {
771 int ret = 0;
772
773 health_code_update(&health_thread_cmd);
774
775 /* Create UST event on tracer */
776 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
777 &ua_event->obj);
778 if (ret < 0) {
779 ERR("Error ustctl create event %s for app pid: %d with ret %d",
780 ua_event->attr.name, app->pid, ret);
781 goto error;
782 }
783
784 ua_event->handle = ua_event->obj->handle;
785
786 DBG2("UST app event %s created successfully for pid:%d",
787 ua_event->attr.name, app->pid);
788
789 health_code_update(&health_thread_cmd);
790
791 /* If event not enabled, disable it on the tracer */
792 if (ua_event->enabled == 0) {
793 ret = disable_ust_event(app, ua_sess, ua_event);
794 if (ret < 0) {
795 /*
796 * If we hit an EPERM, something is wrong with our disable call. If
797 * we get an EEXIST, there is a problem on the tracer side since we
798 * just created it.
799 */
800 switch (ret) {
801 case -LTTNG_UST_ERR_PERM:
802 /* Code flow problem */
803 assert(0);
804 case -LTTNG_UST_ERR_EXIST:
805 /* It's OK for our use case. */
806 ret = 0;
807 break;
808 default:
809 break;
810 }
811 goto error;
812 }
813 }
814
815 error:
816 health_code_update(&health_thread_cmd);
817 return ret;
818 }
819
820 /*
821 * Copy data between an UST app event and a LTT event.
822 */
823 static void shadow_copy_event(struct ust_app_event *ua_event,
824 struct ltt_ust_event *uevent)
825 {
826 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
827 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
828
829 ua_event->enabled = uevent->enabled;
830
831 /* Copy event attributes */
832 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
833
834 /* Copy filter bytecode */
835 if (uevent->filter) {
836 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
837 uevent->filter->len);
838 if (!ua_event->filter) {
839 return;
840 }
841 memcpy(ua_event->filter, uevent->filter,
842 sizeof(*ua_event->filter) + uevent->filter->len);
843 }
844 }
845
846 /*
847 * Copy data between an UST app channel and a LTT channel.
848 */
849 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
850 struct ltt_ust_channel *uchan)
851 {
852 struct lttng_ht_iter iter;
853 struct ltt_ust_event *uevent;
854 struct ltt_ust_context *uctx;
855 struct ust_app_event *ua_event;
856 struct ust_app_ctx *ua_ctx;
857
858 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
859
860 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
861 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
862 /* Copy event attributes */
863 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
864
865 ua_chan->enabled = uchan->enabled;
866
867 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
868 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
869 if (ua_ctx == NULL) {
870 continue;
871 }
872 lttng_ht_node_init_ulong(&ua_ctx->node,
873 (unsigned long) ua_ctx->ctx.ctx);
874 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
875 }
876
877 /* Copy all events from ltt ust channel to ust app channel */
878 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
879 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
880 uevent->filter, uevent->attr.loglevel);
881 if (ua_event == NULL) {
882 DBG2("UST event %s not found on shadow copy channel",
883 uevent->attr.name);
884 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
885 if (ua_event == NULL) {
886 continue;
887 }
888 shadow_copy_event(ua_event, uevent);
889 add_unique_ust_app_event(ua_chan->events, ua_event);
890 }
891 }
892
893 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
894 }
895
896 /*
897 * Copy data between a UST app session and a regular LTT session.
898 */
899 static void shadow_copy_session(struct ust_app_session *ua_sess,
900 struct ltt_ust_session *usess, struct ust_app *app)
901 {
902 struct lttng_ht_node_str *ua_chan_node;
903 struct lttng_ht_iter iter;
904 struct ltt_ust_channel *uchan;
905 struct ust_app_channel *ua_chan;
906 time_t rawtime;
907 struct tm *timeinfo;
908 char datetime[16];
909 int ret;
910
911 /* Get date and time for unique app path */
912 time(&rawtime);
913 timeinfo = localtime(&rawtime);
914 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
915
916 DBG2("Shadow copy of session handle %d", ua_sess->handle);
917
918 ua_sess->id = usess->id;
919 ua_sess->uid = usess->uid;
920 ua_sess->gid = usess->gid;
921
922 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
923 datetime);
924 if (ret < 0) {
925 PERROR("asprintf UST shadow copy session");
926 /* TODO: We cannot return an error from here.. */
927 assert(0);
928 }
929
930 /* TODO: support all UST domain */
931
932 /* Iterate over all channels in global domain. */
933 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
934 uchan, node.node) {
935 struct lttng_ht_iter uiter;
936
937 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
938 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
939 if (ua_chan_node != NULL) {
940 /* Session exist. Contiuing. */
941 continue;
942 }
943
944 DBG2("Channel %s not found on shadow session copy, creating it",
945 uchan->name);
946 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
947 if (ua_chan == NULL) {
948 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
949 continue;
950 }
951
952 shadow_copy_channel(ua_chan, uchan);
953 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
954 }
955 }
956
957 /*
958 * Lookup sesison wrapper.
959 */
960 static
961 void __lookup_session_by_app(struct ltt_ust_session *usess,
962 struct ust_app *app, struct lttng_ht_iter *iter)
963 {
964 /* Get right UST app session from app */
965 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
966 }
967
968 /*
969 * Return ust app session from the app session hashtable using the UST session
970 * id.
971 */
972 static struct ust_app_session *lookup_session_by_app(
973 struct ltt_ust_session *usess, struct ust_app *app)
974 {
975 struct lttng_ht_iter iter;
976 struct lttng_ht_node_ulong *node;
977
978 __lookup_session_by_app(usess, app, &iter);
979 node = lttng_ht_iter_get_node_ulong(&iter);
980 if (node == NULL) {
981 goto error;
982 }
983
984 return caa_container_of(node, struct ust_app_session, node);
985
986 error:
987 return NULL;
988 }
989
990 /*
991 * Create a UST session onto the tracer of app and add it the session
992 * hashtable.
993 *
994 * Return ust app session or NULL on error.
995 */
996 static struct ust_app_session *create_ust_app_session(
997 struct ltt_ust_session *usess, struct ust_app *app)
998 {
999 int ret;
1000 struct ust_app_session *ua_sess;
1001
1002 health_code_update(&health_thread_cmd);
1003
1004 ua_sess = lookup_session_by_app(usess, app);
1005 if (ua_sess == NULL) {
1006 DBG2("UST app pid: %d session id %d not found, creating it",
1007 app->pid, usess->id);
1008 ua_sess = alloc_ust_app_session();
1009 if (ua_sess == NULL) {
1010 /* Only malloc can failed so something is really wrong */
1011 goto end;
1012 }
1013 shadow_copy_session(ua_sess, usess, app);
1014 }
1015
1016 health_code_update(&health_thread_cmd);
1017
1018 if (ua_sess->handle == -1) {
1019 ret = ustctl_create_session(app->sock);
1020 if (ret < 0) {
1021 ERR("Creating session for app pid %d", app->pid);
1022 delete_ust_app_session(-1, ua_sess);
1023 /* This means that the tracer is gone... */
1024 ua_sess = (void*) -1UL;
1025 goto end;
1026 }
1027
1028 ua_sess->handle = ret;
1029
1030 /* Add ust app session to app's HT */
1031 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
1032 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
1033
1034 DBG2("UST app session created successfully with handle %d", ret);
1035 }
1036
1037 end:
1038 health_code_update(&health_thread_cmd);
1039 return ua_sess;
1040 }
1041
1042 /*
1043 * Create a context for the channel on the tracer.
1044 */
1045 static
1046 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1047 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1048 struct ust_app *app)
1049 {
1050 int ret = 0;
1051 struct lttng_ht_iter iter;
1052 struct lttng_ht_node_ulong *node;
1053 struct ust_app_ctx *ua_ctx;
1054
1055 DBG2("UST app adding context to channel %s", ua_chan->name);
1056
1057 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1058 node = lttng_ht_iter_get_node_ulong(&iter);
1059 if (node != NULL) {
1060 ret = -EEXIST;
1061 goto error;
1062 }
1063
1064 ua_ctx = alloc_ust_app_ctx(uctx);
1065 if (ua_ctx == NULL) {
1066 /* malloc failed */
1067 ret = -1;
1068 goto error;
1069 }
1070
1071 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1072 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
1073
1074 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078
1079 error:
1080 return ret;
1081 }
1082
1083 /*
1084 * Set UST filter for the event on the tracer.
1085 */
1086 static
1087 int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1088 struct ust_app_event *ua_event,
1089 struct lttng_filter_bytecode *bytecode,
1090 struct ust_app *app)
1091 {
1092 int ret = 0;
1093
1094 DBG2("UST app adding context to event %s", ua_event->name);
1095
1096 /* Copy filter bytecode */
1097 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1098 if (!ua_event->filter) {
1099 return -ENOMEM;
1100 }
1101 memcpy(ua_event->filter, bytecode,
1102 sizeof(*ua_event->filter) + bytecode->len);
1103 ret = set_ust_event_filter(ua_event, app);
1104 if (ret < 0) {
1105 goto error;
1106 }
1107
1108 error:
1109 return ret;
1110 }
1111
1112 /*
1113 * Enable on the tracer side a ust app event for the session and channel.
1114 */
1115 static
1116 int enable_ust_app_event(struct ust_app_session *ua_sess,
1117 struct ust_app_event *ua_event, struct ust_app *app)
1118 {
1119 int ret;
1120
1121 ret = enable_ust_event(app, ua_sess, ua_event);
1122 if (ret < 0) {
1123 goto error;
1124 }
1125
1126 ua_event->enabled = 1;
1127
1128 error:
1129 return ret;
1130 }
1131
1132 /*
1133 * Disable on the tracer side a ust app event for the session and channel.
1134 */
1135 static int disable_ust_app_event(struct ust_app_session *ua_sess,
1136 struct ust_app_event *ua_event, struct ust_app *app)
1137 {
1138 int ret;
1139
1140 ret = disable_ust_event(app, ua_sess, ua_event);
1141 if (ret < 0) {
1142 goto error;
1143 }
1144
1145 ua_event->enabled = 0;
1146
1147 error:
1148 return ret;
1149 }
1150
1151 /*
1152 * Lookup ust app channel for session and disable it on the tracer side.
1153 */
1154 static
1155 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1156 struct ust_app_channel *ua_chan, struct ust_app *app)
1157 {
1158 int ret;
1159
1160 ret = disable_ust_channel(app, ua_sess, ua_chan);
1161 if (ret < 0) {
1162 goto error;
1163 }
1164
1165 ua_chan->enabled = 0;
1166
1167 error:
1168 return ret;
1169 }
1170
1171 /*
1172 * Lookup ust app channel for session and enable it on the tracer side.
1173 */
1174 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1175 struct ltt_ust_channel *uchan, struct ust_app *app)
1176 {
1177 int ret = 0;
1178 struct lttng_ht_iter iter;
1179 struct lttng_ht_node_str *ua_chan_node;
1180 struct ust_app_channel *ua_chan;
1181
1182 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1183 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1184 if (ua_chan_node == NULL) {
1185 DBG2("Unable to find channel %s in ust session id %u",
1186 uchan->name, ua_sess->id);
1187 goto error;
1188 }
1189
1190 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1191
1192 ret = enable_ust_channel(app, ua_sess, ua_chan);
1193 if (ret < 0) {
1194 goto error;
1195 }
1196
1197 error:
1198 return ret;
1199 }
1200
1201 /*
1202 * Create UST app channel and create it on the tracer.
1203 */
1204 static struct ust_app_channel *create_ust_app_channel(
1205 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1206 struct ust_app *app)
1207 {
1208 int ret = 0;
1209 struct lttng_ht_iter iter;
1210 struct lttng_ht_node_str *ua_chan_node;
1211 struct ust_app_channel *ua_chan;
1212
1213 /* Lookup channel in the ust app session */
1214 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1215 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1216 if (ua_chan_node != NULL) {
1217 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1218 goto end;
1219 }
1220
1221 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1222 if (ua_chan == NULL) {
1223 /* Only malloc can fail here */
1224 goto error;
1225 }
1226 shadow_copy_channel(ua_chan, uchan);
1227
1228 ret = create_ust_channel(app, ua_sess, ua_chan);
1229 if (ret < 0) {
1230 /* Not found previously means that it does not exist on the tracer */
1231 assert(ret != -LTTNG_UST_ERR_EXIST);
1232 goto error;
1233 }
1234
1235 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1236
1237 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1238 app->pid);
1239
1240 end:
1241 return ua_chan;
1242
1243 error:
1244 delete_ust_app_channel(-1, ua_chan);
1245 return NULL;
1246 }
1247
1248 /*
1249 * Create UST app event and create it on the tracer side.
1250 */
1251 static
1252 int create_ust_app_event(struct ust_app_session *ua_sess,
1253 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1254 struct ust_app *app)
1255 {
1256 int ret = 0;
1257 struct ust_app_event *ua_event;
1258
1259 /* Get event node */
1260 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1261 uevent->filter, uevent->attr.loglevel);
1262 if (ua_event != 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 != -LTTNG_UST_ERR_EXIST);
1281 goto error;
1282 }
1283
1284 add_unique_ust_app_event(ua_chan->events, ua_event);
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)) != -LTTNG_UST_ERR_NOENT) {
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)) != -LTTNG_UST_ERR_NOENT) {
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 int ret = 0;
1987 struct lttng_ht_iter iter;
1988 struct ust_app *app;
1989 struct ust_app_session *ua_sess;
1990 struct ust_app_channel *ua_chan;
1991
1992 /* Very wrong code flow */
1993 assert(usess);
1994 assert(uchan);
1995
1996 DBG2("UST app adding channel %s to global domain for session id %d",
1997 uchan->name, usess->id);
1998
1999 rcu_read_lock();
2000
2001 /* For every registered applications */
2002 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2003 if (!app->compatible) {
2004 /*
2005 * TODO: In time, we should notice the caller of this error by
2006 * telling him that this is a version error.
2007 */
2008 continue;
2009 }
2010 /*
2011 * Create session on the tracer side and add it to app session HT. Note
2012 * that if session exist, it will simply return a pointer to the ust
2013 * app session.
2014 */
2015 ua_sess = create_ust_app_session(usess, app);
2016 if (ua_sess == NULL) {
2017 /* The malloc() failed. */
2018 ret = -1;
2019 goto error;
2020 } else if (ua_sess == (void *) -1UL) {
2021 /* The application's socket is not valid. Contiuing */
2022 ret = -1;
2023 continue;
2024 }
2025
2026 /* Create channel onto application */
2027 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2028 if (ua_chan == NULL) {
2029 /* Major problem here and it's maybe the tracer or malloc() */
2030 ret = -1;
2031 goto error;
2032 }
2033 }
2034
2035 rcu_read_unlock();
2036
2037 error:
2038 return ret;
2039 }
2040
2041 /*
2042 * Enable event for a specific session and channel on the tracer.
2043 */
2044 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
2045 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2046 {
2047 int ret = 0;
2048 struct lttng_ht_iter iter, uiter;
2049 struct lttng_ht_node_str *ua_chan_node;
2050 struct ust_app *app;
2051 struct ust_app_session *ua_sess;
2052 struct ust_app_channel *ua_chan;
2053 struct ust_app_event *ua_event;
2054
2055 DBG("UST app enabling event %s for all apps for session id %d",
2056 uevent->attr.name, usess->id);
2057
2058 /*
2059 * NOTE: At this point, this function is called only if the session and
2060 * channel passed are already created for all apps. and enabled on the
2061 * tracer also.
2062 */
2063
2064 rcu_read_lock();
2065
2066 /* For all registered applications */
2067 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2068 if (!app->compatible) {
2069 /*
2070 * TODO: In time, we should notice the caller of this error by
2071 * telling him that this is a version error.
2072 */
2073 continue;
2074 }
2075 ua_sess = lookup_session_by_app(usess, app);
2076 /* If ua_sess is NULL, there is a code flow error */
2077 assert(ua_sess);
2078
2079 /* Lookup channel in the ust app session */
2080 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2081 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2082 /* If the channel is not found, there is a code flow error */
2083 assert(ua_chan_node);
2084
2085 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2086
2087 /* Get event node */
2088 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2089 uevent->filter, uevent->attr.loglevel);
2090 if (ua_event == NULL) {
2091 DBG3("UST app enable event %s not found for app PID %d."
2092 "Skipping app", uevent->attr.name, app->pid);
2093 continue;
2094 }
2095
2096 ret = enable_ust_app_event(ua_sess, ua_event, app);
2097 if (ret < 0) {
2098 goto error;
2099 }
2100 }
2101
2102 error:
2103 rcu_read_unlock();
2104 return ret;
2105 }
2106
2107 /*
2108 * For a specific existing UST session and UST channel, creates the event for
2109 * all registered apps.
2110 */
2111 int ust_app_create_event_glb(struct ltt_ust_session *usess,
2112 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2113 {
2114 int ret = 0;
2115 struct lttng_ht_iter iter, uiter;
2116 struct lttng_ht_node_str *ua_chan_node;
2117 struct ust_app *app;
2118 struct ust_app_session *ua_sess;
2119 struct ust_app_channel *ua_chan;
2120
2121 DBG("UST app creating event %s for all apps for session id %d",
2122 uevent->attr.name, usess->id);
2123
2124 rcu_read_lock();
2125
2126 /* For all registered applications */
2127 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2128 if (!app->compatible) {
2129 /*
2130 * TODO: In time, we should notice the caller of this error by
2131 * telling him that this is a version error.
2132 */
2133 continue;
2134 }
2135 ua_sess = lookup_session_by_app(usess, app);
2136 /* If ua_sess is NULL, there is a code flow error */
2137 assert(ua_sess);
2138
2139 /* Lookup channel in the ust app session */
2140 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2141 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2142 /* If the channel is not found, there is a code flow error */
2143 assert(ua_chan_node);
2144
2145 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2146
2147 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2148 if (ret < 0) {
2149 if (ret != -LTTNG_UST_ERR_EXIST) {
2150 /* Possible value at this point: -ENOMEM. If so, we stop! */
2151 break;
2152 }
2153 DBG2("UST app event %s already exist on app PID %d",
2154 uevent->attr.name, app->pid);
2155 continue;
2156 }
2157 }
2158
2159 rcu_read_unlock();
2160
2161 return ret;
2162 }
2163
2164 /*
2165 * Start tracing for a specific UST session and app.
2166 */
2167 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
2168 {
2169 int ret = 0;
2170 struct lttng_ht_iter iter;
2171 struct ust_app_session *ua_sess;
2172 struct ust_app_channel *ua_chan;
2173 struct ltt_ust_stream *ustream;
2174 struct consumer_socket *socket;
2175
2176 DBG("Starting tracing for ust app pid %d", app->pid);
2177
2178 rcu_read_lock();
2179
2180 if (!app->compatible) {
2181 goto end;
2182 }
2183
2184 ua_sess = lookup_session_by_app(usess, app);
2185 if (ua_sess == NULL) {
2186 goto error_rcu_unlock;
2187 }
2188
2189 /* Upon restart, we skip the setup, already done */
2190 if (ua_sess->started) {
2191 goto skip_setup;
2192 }
2193
2194 /* Create directories if consumer is LOCAL and has a path defined. */
2195 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2196 strlen(usess->consumer->dst.trace_path) > 0) {
2197 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2198 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2199 if (ret < 0) {
2200 if (ret != -EEXIST) {
2201 ERR("Trace directory creation error");
2202 ret = -1;
2203 goto error_rcu_unlock;
2204 }
2205 }
2206 }
2207
2208 /* Indicate that the session has been started once */
2209 ua_sess->started = 1;
2210
2211 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2212 if (ret < 0) {
2213 ret = LTTNG_ERR_UST_META_FAIL;
2214 goto error_rcu_unlock;
2215 }
2216
2217 /* For each channel */
2218 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2219 node.node) {
2220 /* Create all streams */
2221 while (1) {
2222 /* Create UST stream */
2223 ustream = zmalloc(sizeof(*ustream));
2224 if (ustream == NULL) {
2225 PERROR("zmalloc ust stream");
2226 goto error_rcu_unlock;
2227 }
2228
2229 /* We are going to receive 2 fds, we need to reserve them. */
2230 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2231 if (ret < 0) {
2232 ERR("Exhausted number of available FD upon stream create");
2233 free(ustream);
2234 goto error_rcu_unlock;
2235 }
2236
2237 health_code_update(&health_thread_cmd);
2238
2239 ret = ustctl_create_stream(app->sock, ua_chan->obj,
2240 &ustream->obj);
2241 if (ret < 0) {
2242 /* Got all streams */
2243 lttng_fd_put(LTTNG_FD_APPS, 2);
2244 free(ustream);
2245 ret = LTTNG_ERR_UST_STREAM_FAIL;
2246 break;
2247 }
2248 ustream->handle = ustream->obj->handle;
2249
2250 health_code_update(&health_thread_cmd);
2251
2252 /* Order is important */
2253 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
2254 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2255 ua_chan->name, ua_chan->streams.count);
2256 ua_chan->streams.count++;
2257 if (ret < 0) {
2258 PERROR("asprintf UST create stream");
2259 /*
2260 * XXX what should we do here with the
2261 * stream ?
2262 */
2263 continue;
2264 }
2265 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2266 ustream->handle);
2267 }
2268
2269 health_code_update(&health_thread_cmd);
2270 }
2271
2272 switch (app->bits_per_long) {
2273 case 64:
2274 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2275 usess->consumer);
2276 if (socket == NULL) {
2277 goto skip_setup;
2278 }
2279 break;
2280 case 32:
2281 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2282 usess->consumer);
2283 if (socket == NULL) {
2284 goto skip_setup;
2285 }
2286 break;
2287 default:
2288 ret = -EINVAL;
2289 goto error_rcu_unlock;
2290 }
2291
2292 /* Setup UST consumer socket and send fds to it */
2293 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
2294 if (ret < 0) {
2295 goto error_rcu_unlock;
2296 }
2297
2298 health_code_update(&health_thread_cmd);
2299
2300 skip_setup:
2301 /* This start the UST tracing */
2302 ret = ustctl_start_session(app->sock, ua_sess->handle);
2303 if (ret < 0) {
2304 ERR("Error starting tracing for app pid: %d", app->pid);
2305 goto error_rcu_unlock;
2306 }
2307
2308 health_code_update(&health_thread_cmd);
2309
2310 /* Quiescent wait after starting trace */
2311 ustctl_wait_quiescent(app->sock);
2312
2313 end:
2314 rcu_read_unlock();
2315 health_code_update(&health_thread_cmd);
2316 return 0;
2317
2318 error_rcu_unlock:
2319 rcu_read_unlock();
2320 health_code_update(&health_thread_cmd);
2321 return -1;
2322 }
2323
2324 /*
2325 * Stop tracing for a specific UST session and app.
2326 */
2327 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2328 {
2329 int ret = 0;
2330 struct lttng_ht_iter iter;
2331 struct ust_app_session *ua_sess;
2332 struct ust_app_channel *ua_chan;
2333
2334 DBG("Stopping tracing for ust app pid %d", app->pid);
2335
2336 rcu_read_lock();
2337
2338 if (!app->compatible) {
2339 goto end;
2340 }
2341
2342 ua_sess = lookup_session_by_app(usess, app);
2343 if (ua_sess == NULL) {
2344 /* Only malloc can failed so something is really wrong */
2345 goto error_rcu_unlock;
2346 }
2347
2348 /*
2349 * If started = 0, it means that stop trace has been called for a session
2350 * that was never started. This is a code flow error and should never
2351 * happen.
2352 */
2353 assert(ua_sess->started == 1);
2354
2355 health_code_update(&health_thread_cmd);
2356
2357 /* This inhibits UST tracing */
2358 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2359 if (ret < 0) {
2360 ERR("Error stopping tracing for app pid: %d", app->pid);
2361 goto error_rcu_unlock;
2362 }
2363
2364 health_code_update(&health_thread_cmd);
2365
2366 /* Quiescent wait after stopping trace */
2367 ustctl_wait_quiescent(app->sock);
2368
2369 health_code_update(&health_thread_cmd);
2370
2371 /* Flushing buffers */
2372 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2373 node.node) {
2374 health_code_update(&health_thread_cmd);
2375 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2376 if (ret < 0) {
2377 ERR("UST app PID %d channel %s flush failed with ret %d",
2378 app->pid, ua_chan->name, ret);
2379 /* Continuing flushing all buffers */
2380 continue;
2381 }
2382 }
2383
2384 health_code_update(&health_thread_cmd);
2385
2386 /* Flush all buffers before stopping */
2387 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2388 if (ret < 0) {
2389 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2390 ret);
2391 }
2392
2393 end:
2394 rcu_read_unlock();
2395 health_code_update(&health_thread_cmd);
2396 return 0;
2397
2398 error_rcu_unlock:
2399 rcu_read_unlock();
2400 health_code_update(&health_thread_cmd);
2401 return -1;
2402 }
2403
2404 /*
2405 * Destroy a specific UST session in apps.
2406 */
2407 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2408 {
2409 struct ust_app_session *ua_sess;
2410 struct lttng_ust_object_data obj;
2411 struct lttng_ht_iter iter;
2412 struct lttng_ht_node_ulong *node;
2413 int ret;
2414
2415 DBG("Destroy tracing for ust app pid %d", app->pid);
2416
2417 rcu_read_lock();
2418
2419 if (!app->compatible) {
2420 goto end;
2421 }
2422
2423 __lookup_session_by_app(usess, app, &iter);
2424 node = lttng_ht_iter_get_node_ulong(&iter);
2425 if (node == NULL) {
2426 /* Only malloc can failed so something is really wrong */
2427 goto error_rcu_unlock;
2428 }
2429 ua_sess = caa_container_of(node, struct ust_app_session, node);
2430 ret = lttng_ht_del(app->sessions, &iter);
2431 assert(!ret);
2432 obj.handle = ua_sess->handle;
2433 obj.shm_fd = -1;
2434 obj.wait_fd = -1;
2435 obj.memory_map_size = 0;
2436 health_code_update(&health_thread_cmd);
2437 ustctl_release_object(app->sock, &obj);
2438
2439 health_code_update(&health_thread_cmd);
2440 delete_ust_app_session(app->sock, ua_sess);
2441
2442 /* Quiescent wait after stopping trace */
2443 ustctl_wait_quiescent(app->sock);
2444
2445 end:
2446 rcu_read_unlock();
2447 health_code_update(&health_thread_cmd);
2448 return 0;
2449
2450 error_rcu_unlock:
2451 rcu_read_unlock();
2452 health_code_update(&health_thread_cmd);
2453 return -1;
2454 }
2455
2456 /*
2457 * Start tracing for the UST session.
2458 */
2459 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2460 {
2461 int ret = 0;
2462 struct lttng_ht_iter iter;
2463 struct ust_app *app;
2464
2465 DBG("Starting all UST traces");
2466
2467 rcu_read_lock();
2468
2469 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2470 ret = ust_app_start_trace(usess, app);
2471 if (ret < 0) {
2472 /* Continue to next apps even on error */
2473 continue;
2474 }
2475 }
2476
2477 rcu_read_unlock();
2478
2479 return 0;
2480 }
2481
2482 /*
2483 * Start tracing for the UST session.
2484 */
2485 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2486 {
2487 int ret = 0;
2488 struct lttng_ht_iter iter;
2489 struct ust_app *app;
2490
2491 DBG("Stopping all UST traces");
2492
2493 rcu_read_lock();
2494
2495 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2496 ret = ust_app_stop_trace(usess, app);
2497 if (ret < 0) {
2498 /* Continue to next apps even on error */
2499 continue;
2500 }
2501 }
2502
2503 rcu_read_unlock();
2504
2505 return 0;
2506 }
2507
2508 /*
2509 * Destroy app UST session.
2510 */
2511 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2512 {
2513 int ret = 0;
2514 struct lttng_ht_iter iter;
2515 struct ust_app *app;
2516
2517 DBG("Destroy all UST traces");
2518
2519 rcu_read_lock();
2520
2521 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2522 ret = ust_app_destroy_trace(usess, app);
2523 if (ret < 0) {
2524 /* Continue to next apps even on error */
2525 continue;
2526 }
2527 }
2528
2529 rcu_read_unlock();
2530
2531 return 0;
2532 }
2533
2534 /*
2535 * Add channels/events from UST global domain to registered apps at sock.
2536 */
2537 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2538 {
2539 int ret = 0;
2540 struct lttng_ht_iter iter, uiter, iter_ctx;
2541 struct ust_app *app;
2542 struct ust_app_session *ua_sess;
2543 struct ust_app_channel *ua_chan;
2544 struct ust_app_event *ua_event;
2545 struct ust_app_ctx *ua_ctx;
2546
2547 if (usess == NULL) {
2548 ERR("No UST session on global update. Returning");
2549 goto error;
2550 }
2551
2552 DBG2("UST app global update for app sock %d for session id %d", sock,
2553 usess->id);
2554
2555 rcu_read_lock();
2556
2557 app = find_app_by_sock(sock);
2558 if (app == NULL) {
2559 ERR("Failed to update app sock %d", sock);
2560 goto error;
2561 }
2562
2563 if (!app->compatible) {
2564 goto error;
2565 }
2566
2567 ua_sess = create_ust_app_session(usess, app);
2568 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2569 /* Tracer is gone for this session and has been freed */
2570 goto error;
2571 }
2572
2573 /*
2574 * We can iterate safely here over all UST app session sicne the create ust
2575 * app session above made a shadow copy of the UST global domain from the
2576 * ltt ust session.
2577 */
2578 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2579 node.node) {
2580 ret = create_ust_channel(app, ua_sess, ua_chan);
2581 if (ret < 0) {
2582 /* FIXME: Should we quit here or continue... */
2583 continue;
2584 }
2585
2586 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2587 node.node) {
2588 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2589 if (ret < 0) {
2590 /* FIXME: Should we quit here or continue... */
2591 continue;
2592 }
2593 }
2594
2595
2596 /* For each events */
2597 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2598 node.node) {
2599 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2600 if (ret < 0) {
2601 /* FIXME: Should we quit here or continue... */
2602 continue;
2603 }
2604
2605 ret = set_ust_event_filter(ua_event, app);
2606 if (ret < 0) {
2607 /* FIXME: Should we quit here or continue... */
2608 continue;
2609 }
2610 }
2611 }
2612
2613 if (usess->start_trace) {
2614 ret = ust_app_start_trace(usess, app);
2615 if (ret < 0) {
2616 goto error;
2617 }
2618
2619 DBG2("UST trace started for app pid %d", app->pid);
2620 }
2621
2622 error:
2623 rcu_read_unlock();
2624 return;
2625 }
2626
2627 /*
2628 * Add context to a specific channel for global UST domain.
2629 */
2630 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2631 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2632 {
2633 int ret = 0;
2634 struct lttng_ht_node_str *ua_chan_node;
2635 struct lttng_ht_iter iter, uiter;
2636 struct ust_app_channel *ua_chan = NULL;
2637 struct ust_app_session *ua_sess;
2638 struct ust_app *app;
2639
2640 rcu_read_lock();
2641
2642 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2643 if (!app->compatible) {
2644 /*
2645 * TODO: In time, we should notice the caller of this error by
2646 * telling him that this is a version error.
2647 */
2648 continue;
2649 }
2650 ua_sess = lookup_session_by_app(usess, app);
2651 if (ua_sess == NULL) {
2652 continue;
2653 }
2654
2655 /* Lookup channel in the ust app session */
2656 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2657 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2658 if (ua_chan_node == NULL) {
2659 continue;
2660 }
2661 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2662 node);
2663
2664 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2665 if (ret < 0) {
2666 continue;
2667 }
2668 }
2669
2670 rcu_read_unlock();
2671 return ret;
2672 }
2673
2674 /*
2675 * Add context to a specific event in a channel for global UST domain.
2676 */
2677 int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2678 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2679 struct lttng_filter_bytecode *bytecode)
2680 {
2681 int ret = 0;
2682 struct lttng_ht_node_str *ua_chan_node;
2683 struct lttng_ht_iter iter, uiter;
2684 struct ust_app_session *ua_sess;
2685 struct ust_app_event *ua_event;
2686 struct ust_app_channel *ua_chan = NULL;
2687 struct ust_app *app;
2688
2689 rcu_read_lock();
2690
2691 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2692 if (!app->compatible) {
2693 /*
2694 * TODO: In time, we should notice the caller of this error by
2695 * telling him that this is a version error.
2696 */
2697 continue;
2698 }
2699 ua_sess = lookup_session_by_app(usess, app);
2700 if (ua_sess == NULL) {
2701 continue;
2702 }
2703
2704 /* Lookup channel in the ust app session */
2705 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2706 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2707 if (ua_chan_node == NULL) {
2708 continue;
2709 }
2710 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2711 node);
2712
2713 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2714 (struct lttng_ust_filter_bytecode *) bytecode,
2715 uevent->attr.loglevel);
2716 if (ua_event == NULL) {
2717 continue;
2718 }
2719
2720 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2721 if (ret < 0) {
2722 continue;
2723 }
2724 }
2725
2726 rcu_read_unlock();
2727 return ret;
2728 }
2729
2730 /*
2731 * Enable event for a channel from a UST session for a specific PID.
2732 */
2733 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2734 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2735 {
2736 int ret = 0;
2737 struct lttng_ht_iter iter;
2738 struct lttng_ht_node_str *ua_chan_node;
2739 struct ust_app *app;
2740 struct ust_app_session *ua_sess;
2741 struct ust_app_channel *ua_chan;
2742 struct ust_app_event *ua_event;
2743
2744 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2745
2746 rcu_read_lock();
2747
2748 app = ust_app_find_by_pid(pid);
2749 if (app == NULL) {
2750 ERR("UST app enable event per PID %d not found", pid);
2751 ret = -1;
2752 goto error;
2753 }
2754
2755 if (!app->compatible) {
2756 ret = 0;
2757 goto error;
2758 }
2759
2760 ua_sess = lookup_session_by_app(usess, app);
2761 /* If ua_sess is NULL, there is a code flow error */
2762 assert(ua_sess);
2763
2764 /* Lookup channel in the ust app session */
2765 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2766 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2767 /* If the channel is not found, there is a code flow error */
2768 assert(ua_chan_node);
2769
2770 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2771
2772 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2773 uevent->filter, uevent->attr.loglevel);
2774 if (ua_event == NULL) {
2775 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2776 if (ret < 0) {
2777 goto error;
2778 }
2779 } else {
2780 ret = enable_ust_app_event(ua_sess, ua_event, app);
2781 if (ret < 0) {
2782 goto error;
2783 }
2784 }
2785
2786 error:
2787 rcu_read_unlock();
2788 return ret;
2789 }
2790
2791 /*
2792 * Disable event for a channel from a UST session for a specific PID.
2793 */
2794 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2795 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2796 {
2797 int ret = 0;
2798 struct lttng_ht_iter iter;
2799 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2800 struct ust_app *app;
2801 struct ust_app_session *ua_sess;
2802 struct ust_app_channel *ua_chan;
2803 struct ust_app_event *ua_event;
2804
2805 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2806
2807 rcu_read_lock();
2808
2809 app = ust_app_find_by_pid(pid);
2810 if (app == NULL) {
2811 ERR("UST app disable event per PID %d not found", pid);
2812 ret = -1;
2813 goto error;
2814 }
2815
2816 if (!app->compatible) {
2817 ret = 0;
2818 goto error;
2819 }
2820
2821 ua_sess = lookup_session_by_app(usess, app);
2822 /* If ua_sess is NULL, there is a code flow error */
2823 assert(ua_sess);
2824
2825 /* Lookup channel in the ust app session */
2826 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2827 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2828 if (ua_chan_node == NULL) {
2829 /* Channel does not exist, skip disabling */
2830 goto error;
2831 }
2832 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2833
2834 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2835 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2836 if (ua_event_node == NULL) {
2837 /* Event does not exist, skip disabling */
2838 goto error;
2839 }
2840 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2841
2842 ret = disable_ust_app_event(ua_sess, ua_event, app);
2843 if (ret < 0) {
2844 goto error;
2845 }
2846
2847 error:
2848 rcu_read_unlock();
2849 return ret;
2850 }
2851
2852 /*
2853 * Validate version of UST apps and set the compatible bit.
2854 */
2855 int ust_app_validate_version(int sock)
2856 {
2857 int ret;
2858 struct ust_app *app;
2859
2860 rcu_read_lock();
2861
2862 app = find_app_by_sock(sock);
2863 assert(app);
2864
2865 health_code_update(&health_thread_cmd);
2866
2867 ret = ustctl_tracer_version(sock, &app->version);
2868 if (ret < 0) {
2869 goto error;
2870 }
2871
2872 /* Validate version */
2873 if (app->version.major != UST_APP_MAJOR_VERSION) {
2874 goto error;
2875 }
2876
2877 DBG2("UST app PID %d is compatible with internal major version %d "
2878 "(supporting == %d)", app->pid, app->version.major,
2879 UST_APP_MAJOR_VERSION);
2880 app->compatible = 1;
2881 rcu_read_unlock();
2882 health_code_update(&health_thread_cmd);
2883 return 0;
2884
2885 error:
2886 DBG2("UST app PID %d is not compatible with internal major version %d "
2887 "(supporting == %d)", app->pid, app->version.major,
2888 UST_APP_MAJOR_VERSION);
2889 app->compatible = 0;
2890 rcu_read_unlock();
2891 health_code_update(&health_thread_cmd);
2892 return -1;
2893 }
2894
2895 /*
2896 * Calibrate registered applications.
2897 */
2898 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2899 {
2900 int ret = 0;
2901 struct lttng_ht_iter iter;
2902 struct ust_app *app;
2903
2904 rcu_read_lock();
2905
2906 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2907 if (!app->compatible) {
2908 /*
2909 * TODO: In time, we should notice the caller of this error by
2910 * telling him that this is a version error.
2911 */
2912 continue;
2913 }
2914
2915 health_code_update(&health_thread_cmd);
2916
2917 ret = ustctl_calibrate(app->sock, calibrate);
2918 if (ret < 0) {
2919 switch (ret) {
2920 case -ENOSYS:
2921 /* Means that it's not implemented on the tracer side. */
2922 ret = 0;
2923 break;
2924 default:
2925 /* TODO: Report error to user */
2926 DBG2("Calibrate app PID %d returned with error %d",
2927 app->pid, ret);
2928 break;
2929 }
2930 }
2931 }
2932
2933 DBG("UST app global domain calibration finished");
2934
2935 rcu_read_unlock();
2936
2937 health_code_update(&health_thread_cmd);
2938
2939 return ret;
2940 }
LTTng 2.0 tools and control repository
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