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Fix out of order channel insert in hash table
[lttng-tools.git] / lttng-sessiond / ust-app.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <errno.h>
21 #include <pthread.h>
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <sys/stat.h>
26 #include <sys/types.h>
27 #include <unistd.h>
28 #include <runas.h>
29
30 #include <urcu/compiler.h>
31
32 #include <lttngerr.h>
33 #include <lttng-ht.h>
34 #include <lttng-share.h>
35 #include <runas.h>
36
37 #include "ust-app.h"
38 #include "ust-consumer.h"
39 #include "ust-ctl.h"
40
41 /*
42 * Delete ust context safely. RCU read lock must be held before calling
43 * this function.
44 */
45 static
46 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
47 {
48 if (ua_ctx->obj) {
49 ustctl_release_object(sock, ua_ctx->obj);
50 free(ua_ctx->obj);
51 }
52 free(ua_ctx);
53 }
54
55 /*
56 * Delete ust app event safely. RCU read lock must be held before calling
57 * this function.
58 */
59 static
60 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
61 {
62 int ret;
63 struct lttng_ht_iter iter;
64 struct ust_app_ctx *ua_ctx;
65
66 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
67 node.node) {
68 ret = lttng_ht_del(ua_event->ctx, &iter);
69 assert(!ret);
70 delete_ust_app_ctx(sock, ua_ctx);
71 }
72 lttng_ht_destroy(ua_event->ctx);
73
74 if (ua_event->obj != NULL) {
75 ustctl_release_object(sock, ua_event->obj);
76 free(ua_event->obj);
77 }
78 free(ua_event);
79 }
80
81 /*
82 * Delete ust app stream safely. RCU read lock must be held before calling
83 * this function.
84 */
85 static
86 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
87 {
88 if (stream->obj) {
89 ustctl_release_object(sock, stream->obj);
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 free(ua_chan->obj);
134 }
135 free(ua_chan);
136 }
137
138 /*
139 * Delete ust app session safely. RCU read lock must be held before calling
140 * this function.
141 */
142 static
143 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
144 {
145 int ret;
146 struct lttng_ht_iter iter;
147 struct ust_app_channel *ua_chan;
148
149 if (ua_sess->metadata) {
150 if (ua_sess->metadata->stream_obj) {
151 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
152 free(ua_sess->metadata->stream_obj);
153 }
154 if (ua_sess->metadata->obj) {
155 ustctl_release_object(sock, ua_sess->metadata->obj);
156 free(ua_sess->metadata->obj);
157 }
158 }
159
160 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
161 node.node) {
162 ret = lttng_ht_del(ua_sess->channels, &iter);
163 assert(!ret);
164 delete_ust_app_channel(sock, ua_chan);
165 }
166 lttng_ht_destroy(ua_sess->channels);
167
168 if (ua_sess->handle != -1) {
169 ustctl_release_handle(sock, ua_sess->handle);
170 }
171 free(ua_sess);
172 }
173
174 /*
175 * Delete a traceable application structure from the global list. Never call
176 * this function outside of a call_rcu call.
177 */
178 static
179 void delete_ust_app(struct ust_app *app)
180 {
181 int ret, sock;
182 struct lttng_ht_iter iter;
183 struct ust_app_session *ua_sess;
184
185 rcu_read_lock();
186
187 /* Delete ust app sessions info */
188 sock = app->key.sock;
189 app->key.sock = -1;
190
191 /* Wipe sessions */
192 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
193 node.node) {
194 ret = lttng_ht_del(app->sessions, &iter);
195 assert(!ret);
196 delete_ust_app_session(app->key.sock, ua_sess);
197 }
198 lttng_ht_destroy(app->sessions);
199
200 /*
201 * Wait until we have removed the key from the sock hash table before
202 * closing this socket, otherwise an application could re-use the socket ID
203 * and race with the teardown, using the same hash table entry.
204 */
205 close(sock);
206
207 DBG2("UST app pid %d deleted", app->key.pid);
208 free(app);
209
210 rcu_read_unlock();
211 }
212
213 /*
214 * URCU intermediate call to delete an UST app.
215 */
216 static
217 void delete_ust_app_rcu(struct rcu_head *head)
218 {
219 struct lttng_ht_node_ulong *node =
220 caa_container_of(head, struct lttng_ht_node_ulong, head);
221 struct ust_app *app =
222 caa_container_of(node, struct ust_app, node);
223
224 DBG3("Call RCU deleting app PID %d", app->key.pid);
225 delete_ust_app(app);
226 }
227
228 /*
229 * Alloc new UST app session.
230 */
231 static
232 struct ust_app_session *alloc_ust_app_session(void)
233 {
234 struct ust_app_session *ua_sess;
235
236 /* Init most of the default value by allocating and zeroing */
237 ua_sess = zmalloc(sizeof(struct ust_app_session));
238 if (ua_sess == NULL) {
239 PERROR("malloc");
240 goto error;
241 }
242
243 ua_sess->handle = -1;
244 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
245
246 return ua_sess;
247
248 error:
249 return NULL;
250 }
251
252 /*
253 * Alloc new UST app channel.
254 */
255 static
256 struct ust_app_channel *alloc_ust_app_channel(char *name,
257 struct lttng_ust_channel *attr)
258 {
259 struct ust_app_channel *ua_chan;
260
261 /* Init most of the default value by allocating and zeroing */
262 ua_chan = zmalloc(sizeof(struct ust_app_channel));
263 if (ua_chan == NULL) {
264 PERROR("malloc");
265 goto error;
266 }
267
268 /* Setup channel name */
269 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
270 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
271
272 ua_chan->enabled = 1;
273 ua_chan->handle = -1;
274 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
275 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
276 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
277
278 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
279
280 /* Copy attributes */
281 if (attr) {
282 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
283 }
284
285 DBG3("UST app channel %s allocated", ua_chan->name);
286
287 return ua_chan;
288
289 error:
290 return NULL;
291 }
292
293 /*
294 * Alloc new UST app event.
295 */
296 static
297 struct ust_app_event *alloc_ust_app_event(char *name,
298 struct lttng_ust_event *attr)
299 {
300 struct ust_app_event *ua_event;
301
302 /* Init most of the default value by allocating and zeroing */
303 ua_event = zmalloc(sizeof(struct ust_app_event));
304 if (ua_event == NULL) {
305 PERROR("malloc");
306 goto error;
307 }
308
309 ua_event->enabled = 1;
310 strncpy(ua_event->name, name, sizeof(ua_event->name));
311 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
312 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
313 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
314
315 /* Copy attributes */
316 if (attr) {
317 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
318 }
319
320 DBG3("UST app event %s allocated", ua_event->name);
321
322 return ua_event;
323
324 error:
325 return NULL;
326 }
327
328 /*
329 * Alloc new UST app context.
330 */
331 static
332 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
333 {
334 struct ust_app_ctx *ua_ctx;
335
336 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
337 if (ua_ctx == NULL) {
338 goto error;
339 }
340
341 if (uctx) {
342 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
343 }
344
345 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
346
347 error:
348 return ua_ctx;
349 }
350
351 /*
352 * Find an ust_app using the sock and return it. RCU read side lock must be
353 * held before calling this helper function.
354 */
355 static
356 struct ust_app *find_app_by_sock(int sock)
357 {
358 struct lttng_ht_node_ulong *node;
359 struct ust_app_key *key;
360 struct lttng_ht_iter iter;
361
362 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
363 &iter);
364 node = lttng_ht_iter_get_node_ulong(&iter);
365 if (node == NULL) {
366 DBG2("UST app find by sock %d key not found", sock);
367 goto error;
368 }
369 key = caa_container_of(node, struct ust_app_key, node);
370
371 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
372 node = lttng_ht_iter_get_node_ulong(&iter);
373 if (node == NULL) {
374 DBG2("UST app find by sock %d not found", sock);
375 goto error;
376 }
377 return caa_container_of(node, struct ust_app, node);
378
379 error:
380 return NULL;
381 }
382
383 /*
384 * Create the channel context on the tracer.
385 */
386 static
387 int create_ust_channel_context(struct ust_app_channel *ua_chan,
388 struct ust_app_ctx *ua_ctx, struct ust_app *app)
389 {
390 int ret;
391
392 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
393 ua_chan->obj, &ua_ctx->obj);
394 if (ret < 0) {
395 goto error;
396 }
397
398 ua_ctx->handle = ua_ctx->obj->handle;
399
400 DBG2("UST app context added to channel %s successfully", ua_chan->name);
401
402 error:
403 return ret;
404 }
405
406 /*
407 * Create the event context on the tracer.
408 */
409 static
410 int create_ust_event_context(struct ust_app_event *ua_event,
411 struct ust_app_ctx *ua_ctx, struct ust_app *app)
412 {
413 int ret;
414
415 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
416 ua_event->obj, &ua_ctx->obj);
417 if (ret < 0) {
418 goto error;
419 }
420
421 ua_ctx->handle = ua_ctx->obj->handle;
422
423 DBG2("UST app context added to event %s successfully", ua_event->name);
424
425 error:
426 return ret;
427 }
428
429 /*
430 * Disable the specified event on to UST tracer for the UST session.
431 */
432 static int disable_ust_event(struct ust_app *app,
433 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
434 {
435 int ret;
436
437 ret = ustctl_disable(app->key.sock, ua_event->obj);
438 if (ret < 0) {
439 ERR("UST app event %s disable failed for app (pid: %d) "
440 "and session handle %d with ret %d",
441 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
442 goto error;
443 }
444
445 DBG2("UST app event %s disabled successfully for app (pid: %d)",
446 ua_event->attr.name, app->key.pid);
447
448 error:
449 return ret;
450 }
451
452 /*
453 * Disable the specified channel on to UST tracer for the UST session.
454 */
455 static int disable_ust_channel(struct ust_app *app,
456 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
457 {
458 int ret;
459
460 ret = ustctl_disable(app->key.sock, ua_chan->obj);
461 if (ret < 0) {
462 ERR("UST app channel %s disable failed for app (pid: %d) "
463 "and session handle %d with ret %d",
464 ua_chan->name, app->key.pid, ua_sess->handle, ret);
465 goto error;
466 }
467
468 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
469 ua_chan->name, app->key.pid);
470
471 error:
472 return ret;
473 }
474
475 /*
476 * Enable the specified channel on to UST tracer for the UST session.
477 */
478 static int enable_ust_channel(struct ust_app *app,
479 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
480 {
481 int ret;
482
483 ret = ustctl_enable(app->key.sock, ua_chan->obj);
484 if (ret < 0) {
485 ERR("UST app channel %s enable failed for app (pid: %d) "
486 "and session handle %d with ret %d",
487 ua_chan->name, app->key.pid, ua_sess->handle, ret);
488 goto error;
489 }
490
491 ua_chan->enabled = 1;
492
493 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
494 ua_chan->name, app->key.pid);
495
496 error:
497 return ret;
498 }
499
500 /*
501 * Enable the specified event on to UST tracer for the UST session.
502 */
503 static int enable_ust_event(struct ust_app *app,
504 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
505 {
506 int ret;
507
508 ret = ustctl_enable(app->key.sock, ua_event->obj);
509 if (ret < 0) {
510 ERR("UST app event %s enable failed for app (pid: %d) "
511 "and session handle %d with ret %d",
512 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
513 goto error;
514 }
515
516 DBG2("UST app event %s enabled successfully for app (pid: %d)",
517 ua_event->attr.name, app->key.pid);
518
519 error:
520 return ret;
521 }
522
523 /*
524 * Open metadata onto the UST tracer for a UST session.
525 */
526 static int open_ust_metadata(struct ust_app *app,
527 struct ust_app_session *ua_sess)
528 {
529 int ret;
530 struct lttng_ust_channel_attr uattr;
531
532 uattr.overwrite = ua_sess->metadata->attr.overwrite;
533 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
534 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
535 uattr.switch_timer_interval =
536 ua_sess->metadata->attr.switch_timer_interval;
537 uattr.read_timer_interval =
538 ua_sess->metadata->attr.read_timer_interval;
539 uattr.output = ua_sess->metadata->attr.output;
540
541 /* UST tracer metadata creation */
542 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
543 &ua_sess->metadata->obj);
544 if (ret < 0) {
545 ERR("UST app open metadata failed for app pid:%d",
546 app->key.pid);
547 goto error;
548 }
549
550 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
551
552 error:
553 return ret;
554 }
555
556 /*
557 * Create stream onto the UST tracer for a UST session.
558 */
559 static int create_ust_stream(struct ust_app *app,
560 struct ust_app_session *ua_sess)
561 {
562 int ret;
563
564 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
565 &ua_sess->metadata->stream_obj);
566 if (ret < 0) {
567 ERR("UST create metadata stream failed");
568 goto error;
569 }
570
571 error:
572 return ret;
573 }
574
575 /*
576 * Create the specified channel onto the UST tracer for a UST session.
577 */
578 static int create_ust_channel(struct ust_app *app,
579 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
580 {
581 int ret;
582
583 /* TODO: remove cast and use lttng-ust-abi.h */
584 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
585 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
586 if (ret < 0) {
587 ERR("Creating channel %s for app (pid: %d, sock: %d) "
588 "and session handle %d with ret %d",
589 ua_chan->name, app->key.pid, app->key.sock,
590 ua_sess->handle, ret);
591 goto error;
592 }
593
594 ua_chan->handle = ua_chan->obj->handle;
595 ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
596 ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
597 ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
598
599 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
600 ua_chan->name, app->key.pid, app->key.sock);
601
602 /* If channel is not enabled, disable it on the tracer */
603 if (!ua_chan->enabled) {
604 ret = disable_ust_channel(app, ua_sess, ua_chan);
605 if (ret < 0) {
606 goto error;
607 }
608 }
609
610 error:
611 return ret;
612 }
613
614 /*
615 * Create the specified event onto the UST tracer for a UST session.
616 */
617 static
618 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
619 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
620 {
621 int ret = 0;
622
623 /* Create UST event on tracer */
624 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
625 &ua_event->obj);
626 if (ret < 0) {
627 ERR("Error ustctl create event %s for app pid: %d with ret %d",
628 ua_event->attr.name, app->key.pid, ret);
629 goto error;
630 }
631
632 ua_event->handle = ua_event->obj->handle;
633
634 DBG2("UST app event %s created successfully for pid:%d",
635 ua_event->attr.name, app->key.pid);
636
637 /* If event not enabled, disable it on the tracer */
638 if (!ua_event->enabled) {
639 ret = disable_ust_event(app, ua_sess, ua_event);
640 if (ret < 0) {
641 goto error;
642 }
643 }
644
645 error:
646 return ret;
647 }
648
649 /*
650 * Copy data between an UST app event and a LTT event.
651 */
652 static void shadow_copy_event(struct ust_app_event *ua_event,
653 struct ltt_ust_event *uevent)
654 {
655 struct lttng_ht_iter iter;
656 struct ltt_ust_context *uctx;
657 struct ust_app_ctx *ua_ctx;
658
659 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
660 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
661
662 /* Copy event attributes */
663 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
664
665 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
666 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
667 if (ua_ctx == NULL) {
668 continue;
669 }
670 lttng_ht_node_init_ulong(&ua_ctx->node,
671 (unsigned long) ua_ctx->ctx.ctx);
672 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
673 }
674 }
675
676 /*
677 * Copy data between an UST app channel and a LTT channel.
678 */
679 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
680 struct ltt_ust_channel *uchan)
681 {
682 struct lttng_ht_iter iter;
683 struct lttng_ht_node_str *ua_event_node;
684 struct ltt_ust_event *uevent;
685 struct ltt_ust_context *uctx;
686 struct ust_app_event *ua_event;
687 struct ust_app_ctx *ua_ctx;
688
689 DBG2("Shadow copy of UST app channel %s", ua_chan->name);
690
691 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
692 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
693 /* Copy event attributes */
694 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
695
696 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
697 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
698 if (ua_ctx == NULL) {
699 continue;
700 }
701 lttng_ht_node_init_ulong(&ua_ctx->node,
702 (unsigned long) ua_ctx->ctx.ctx);
703 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
704 }
705
706 /* Copy all events from ltt ust channel to ust app channel */
707 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
708 struct lttng_ht_iter uiter;
709
710 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
711 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
712 if (ua_event_node == NULL) {
713 DBG2("UST event %s not found on shadow copy channel",
714 uevent->attr.name);
715 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
716 if (ua_event == NULL) {
717 continue;
718 }
719 shadow_copy_event(ua_event, uevent);
720 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
721 }
722 }
723
724 DBG3("Shadow copy channel done");
725 }
726
727 /*
728 * Copy data between a UST app session and a regular LTT session.
729 */
730 static void shadow_copy_session(struct ust_app_session *ua_sess,
731 struct ltt_ust_session *usess, struct ust_app *app)
732 {
733 struct lttng_ht_node_str *ua_chan_node;
734 struct lttng_ht_iter iter;
735 struct ltt_ust_channel *uchan;
736 struct ust_app_channel *ua_chan;
737 time_t rawtime;
738 struct tm *timeinfo;
739 char datetime[16];
740 int ret;
741
742 /* Get date and time for unique app path */
743 time(&rawtime);
744 timeinfo = localtime(&rawtime);
745 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
746
747 DBG2("Shadow copy of session handle %d", ua_sess->handle);
748
749 ua_sess->id = usess->id;
750 ua_sess->uid = usess->uid;
751 ua_sess->gid = usess->gid;
752
753 ret = snprintf(ua_sess->path, PATH_MAX,
754 "%s/%s-%d-%s",
755 usess->pathname, app->name, app->key.pid,
756 datetime);
757 if (ret < 0) {
758 PERROR("asprintf UST shadow copy session");
759 /* TODO: We cannot return an error from here.. */
760 assert(0);
761 }
762
763 /* TODO: support all UST domain */
764
765 /* Iterate over all channels in global domain. */
766 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
767 uchan, node.node) {
768 struct lttng_ht_iter uiter;
769
770 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
771 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
772 if (ua_chan_node != NULL) {
773 continue;
774 }
775
776 DBG2("Channel %s not found on shadow session copy, creating it",
777 uchan->name);
778 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
779 if (ua_chan == NULL) {
780 /* malloc failed... continuing */
781 continue;
782 }
783
784 shadow_copy_channel(ua_chan, uchan);
785 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
786 }
787 }
788
789 /*
790 * Lookup sesison wrapper.
791 */
792 static
793 void __lookup_session_by_app(struct ltt_ust_session *usess,
794 struct ust_app *app, struct lttng_ht_iter *iter)
795 {
796 /* Get right UST app session from app */
797 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
798 }
799
800 /*
801 * Return ust app session from the app session hashtable using the UST session
802 * id.
803 */
804 static struct ust_app_session *lookup_session_by_app(
805 struct ltt_ust_session *usess, struct ust_app *app)
806 {
807 struct lttng_ht_iter iter;
808 struct lttng_ht_node_ulong *node;
809
810 __lookup_session_by_app(usess, app, &iter);
811 node = lttng_ht_iter_get_node_ulong(&iter);
812 if (node == NULL) {
813 goto error;
814 }
815
816 return caa_container_of(node, struct ust_app_session, node);
817
818 error:
819 return NULL;
820 }
821
822 /*
823 * Create a UST session onto the tracer of app and add it the session
824 * hashtable.
825 *
826 * Return ust app session or NULL on error.
827 */
828 static struct ust_app_session *create_ust_app_session(
829 struct ltt_ust_session *usess, struct ust_app *app)
830 {
831 int ret;
832 struct ust_app_session *ua_sess;
833
834 ua_sess = lookup_session_by_app(usess, app);
835 if (ua_sess == NULL) {
836 DBG2("UST app pid: %d session id %d not found, creating it",
837 app->key.pid, usess->id);
838 ua_sess = alloc_ust_app_session();
839 if (ua_sess == NULL) {
840 /* Only malloc can failed so something is really wrong */
841 goto error;
842 }
843 shadow_copy_session(ua_sess, usess, app);
844 }
845
846 if (ua_sess->handle == -1) {
847 ret = ustctl_create_session(app->key.sock);
848 if (ret < 0) {
849 ERR("Error creating session for app pid %d, sock %d",
850 app->key.pid, app->key.sock);
851 /* TODO: free() ua_sess */
852 goto error;
853 }
854
855 DBG2("UST app ustctl create session handle %d", ret);
856 ua_sess->handle = ret;
857
858 /* Add ust app session to app's HT */
859 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
860 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
861
862 DBG2("UST app session created successfully with handle %d", ret);
863 }
864
865 return ua_sess;
866
867 error:
868 return NULL;
869 }
870
871 /*
872 * Create a context for the channel on the tracer.
873 */
874 static
875 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
876 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
877 struct ust_app *app)
878 {
879 int ret = 0;
880 struct lttng_ht_iter iter;
881 struct lttng_ht_node_ulong *node;
882 struct ust_app_ctx *ua_ctx;
883
884 DBG2("UST app adding context to channel %s", ua_chan->name);
885
886 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
887 node = lttng_ht_iter_get_node_ulong(&iter);
888 if (node != NULL) {
889 ret = -EEXIST;
890 goto error;
891 }
892
893 ua_ctx = alloc_ust_app_ctx(uctx);
894 if (ua_ctx == NULL) {
895 /* malloc failed */
896 ret = -1;
897 goto error;
898 }
899
900 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
901 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
902
903 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
904 if (ret < 0) {
905 goto error;
906 }
907
908 error:
909 return ret;
910 }
911
912 /*
913 * Create an UST context and enable it for the event on the tracer.
914 */
915 static
916 int create_ust_app_event_context(struct ust_app_session *ua_sess,
917 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
918 struct ust_app *app)
919 {
920 int ret = 0;
921 struct lttng_ht_iter iter;
922 struct lttng_ht_node_ulong *node;
923 struct ust_app_ctx *ua_ctx;
924
925 DBG2("UST app adding context to event %s", ua_event->name);
926
927 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
928 node = lttng_ht_iter_get_node_ulong(&iter);
929 if (node != NULL) {
930 ret = -EEXIST;
931 goto error;
932 }
933
934 ua_ctx = alloc_ust_app_ctx(uctx);
935 if (ua_ctx == NULL) {
936 /* malloc failed */
937 ret = -1;
938 goto error;
939 }
940
941 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
942 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
943
944 ret = create_ust_event_context(ua_event, ua_ctx, app);
945 if (ret < 0) {
946 goto error;
947 }
948
949 error:
950 return ret;
951 }
952
953 /*
954 * Enable on the tracer side a ust app event for the session and channel.
955 */
956 static
957 int enable_ust_app_event(struct ust_app_session *ua_sess,
958 struct ust_app_event *ua_event, struct ust_app *app)
959 {
960 int ret;
961
962 ret = enable_ust_event(app, ua_sess, ua_event);
963 if (ret < 0) {
964 goto error;
965 }
966
967 ua_event->enabled = 1;
968
969 error:
970 return ret;
971 }
972
973 /*
974 * Disable on the tracer side a ust app event for the session and channel.
975 */
976 static int disable_ust_app_event(struct ust_app_session *ua_sess,
977 struct ust_app_event *ua_event, struct ust_app *app)
978 {
979 int ret;
980
981 ret = disable_ust_event(app, ua_sess, ua_event);
982 if (ret < 0) {
983 goto error;
984 }
985
986 ua_event->enabled = 0;
987
988 error:
989 return ret;
990 }
991
992 /*
993 * Lookup ust app channel for session and disable it on the tracer side.
994 */
995 static
996 int disable_ust_app_channel(struct ust_app_session *ua_sess,
997 struct ust_app_channel *ua_chan, struct ust_app *app)
998 {
999 int ret;
1000
1001 ret = disable_ust_channel(app, ua_sess, ua_chan);
1002 if (ret < 0) {
1003 goto error;
1004 }
1005
1006 ua_chan->enabled = 0;
1007
1008 error:
1009 return ret;
1010 }
1011
1012 /*
1013 * Lookup ust app channel for session and enable it on the tracer side.
1014 */
1015 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1016 struct ltt_ust_channel *uchan, struct ust_app *app)
1017 {
1018 int ret = 0;
1019 struct lttng_ht_iter iter;
1020 struct lttng_ht_node_str *ua_chan_node;
1021 struct ust_app_channel *ua_chan;
1022
1023 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1024 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1025 if (ua_chan_node == NULL) {
1026 DBG2("Unable to find channel %s in ust session id %u",
1027 uchan->name, ua_sess->id);
1028 goto error;
1029 }
1030
1031 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1032
1033 ret = enable_ust_channel(app, ua_sess, ua_chan);
1034 if (ret < 0) {
1035 goto error;
1036 }
1037
1038 error:
1039 return ret;
1040 }
1041
1042 /*
1043 * Create UST app channel and create it on the tracer.
1044 */
1045 static struct ust_app_channel *create_ust_app_channel(
1046 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1047 struct ust_app *app)
1048 {
1049 int ret = 0;
1050 struct lttng_ht_iter iter;
1051 struct lttng_ht_node_str *ua_chan_node;
1052 struct ust_app_channel *ua_chan;
1053
1054 /* Lookup channel in the ust app session */
1055 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1056 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1057 if (ua_chan_node == NULL) {
1058 DBG2("Unable to find channel %s in ust session id %u",
1059 uchan->name, ua_sess->id);
1060 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1061 if (ua_chan == NULL) {
1062 goto error;
1063 }
1064 shadow_copy_channel(ua_chan, uchan);
1065 } else {
1066 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1067 }
1068
1069 ret = create_ust_channel(app, ua_sess, ua_chan);
1070 if (ret < 0) {
1071 goto error;
1072 }
1073
1074 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1075
1076 return ua_chan;
1077
1078 error:
1079 return NULL;
1080 }
1081
1082 /*
1083 * Create UST app event and create it on the tracer side.
1084 */
1085 static
1086 int create_ust_app_event(struct ust_app_session *ua_sess,
1087 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1088 struct ust_app *app)
1089 {
1090 int ret = 0;
1091 struct lttng_ht_iter iter;
1092 struct lttng_ht_node_str *ua_event_node;
1093 struct ust_app_event *ua_event;
1094
1095 /* Get event node */
1096 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1097 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1098 if (ua_event_node != NULL) {
1099 ERR("UST app event %s already exist. Stopping creation.",
1100 uevent->attr.name);
1101 goto end;
1102 }
1103
1104 /* Does not exist so create one */
1105 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1106 if (ua_event == NULL) {
1107 /* Only malloc can failed so something is really wrong */
1108 ret = -ENOMEM;
1109 goto error;
1110 }
1111 shadow_copy_event(ua_event, uevent);
1112
1113 /* Create it on the tracer side */
1114 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1115 if (ret < 0) {
1116 rcu_read_lock();
1117 delete_ust_app_event(app->key.sock, ua_event);
1118 rcu_read_unlock();
1119 goto error;
1120 }
1121
1122 ua_event->enabled = 1;
1123
1124 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1125
1126 DBG2("UST app create event %s for PID %d completed",
1127 ua_event->name, app->key.pid);
1128
1129 end:
1130 error:
1131 return ret;
1132 }
1133
1134 /*
1135 * Create UST metadata and open it on the tracer side.
1136 */
1137 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1138 char *pathname, struct ust_app *app)
1139 {
1140 int ret = 0;
1141
1142 if (ua_sess->metadata == NULL) {
1143 /* Allocate UST metadata */
1144 ua_sess->metadata = trace_ust_create_metadata(pathname);
1145 if (ua_sess->metadata == NULL) {
1146 ERR("UST app session %d creating metadata failed",
1147 ua_sess->handle);
1148 goto error;
1149 }
1150
1151 ret = open_ust_metadata(app, ua_sess);
1152 if (ret < 0) {
1153 goto error;
1154 }
1155
1156 DBG2("UST metadata opened for app pid %d", app->key.pid);
1157 }
1158
1159 /* Open UST metadata stream */
1160 if (ua_sess->metadata->stream_obj == NULL) {
1161 ret = create_ust_stream(app, ua_sess);
1162 if (ret < 0) {
1163 goto error;
1164 }
1165
1166 ret = mkdir_run_as(ua_sess->path, S_IRWXU | S_IRWXG,
1167 ua_sess->uid, ua_sess->gid);
1168 if (ret < 0) {
1169 PERROR("mkdir UST metadata");
1170 goto error;
1171 }
1172
1173 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1174 "%s/metadata", ua_sess->path);
1175 if (ret < 0) {
1176 PERROR("asprintf UST create stream");
1177 goto error;
1178 }
1179
1180 DBG2("UST metadata stream object created for app pid %d",
1181 app->key.pid);
1182 } else {
1183 ERR("Attempting to create stream without metadata opened");
1184 goto error;
1185 }
1186
1187 return 0;
1188
1189 error:
1190 return -1;
1191 }
1192
1193 /*
1194 * Return pointer to traceable apps list.
1195 */
1196 struct lttng_ht *ust_app_get_ht(void)
1197 {
1198 return ust_app_ht;
1199 }
1200
1201 /*
1202 * Return ust app pointer or NULL if not found.
1203 */
1204 struct ust_app *ust_app_find_by_pid(pid_t pid)
1205 {
1206 struct lttng_ht_node_ulong *node;
1207 struct lttng_ht_iter iter;
1208
1209 rcu_read_lock();
1210 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1211 node = lttng_ht_iter_get_node_ulong(&iter);
1212 if (node == NULL) {
1213 DBG2("UST app no found with pid %d", pid);
1214 goto error;
1215 }
1216 rcu_read_unlock();
1217
1218 DBG2("Found UST app by pid %d", pid);
1219
1220 return caa_container_of(node, struct ust_app, node);
1221
1222 error:
1223 rcu_read_unlock();
1224 return NULL;
1225 }
1226
1227 /*
1228 * Using pid and uid (of the app), allocate a new ust_app struct and
1229 * add it to the global traceable app list.
1230 *
1231 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1232 * bitness is not supported.
1233 */
1234 int ust_app_register(struct ust_register_msg *msg, int sock)
1235 {
1236 struct ust_app *lta;
1237
1238 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1239 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1240 ERR("Registration failed: application \"%s\" (pid: %d) has "
1241 "%d-bit long, but no consumerd for this long size is available.\n",
1242 msg->name, msg->pid, msg->bits_per_long);
1243 close(sock);
1244 return -EINVAL;
1245 }
1246 lta = zmalloc(sizeof(struct ust_app));
1247 if (lta == NULL) {
1248 PERROR("malloc");
1249 return -ENOMEM;
1250 }
1251
1252 lta->ppid = msg->ppid;
1253 lta->uid = msg->uid;
1254 lta->gid = msg->gid;
1255 lta->bits_per_long = msg->bits_per_long;
1256 lta->v_major = msg->major;
1257 lta->v_minor = msg->minor;
1258 strncpy(lta->name, msg->name, sizeof(lta->name));
1259 lta->name[16] = '\0';
1260 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1261
1262 /* Set key map */
1263 lta->key.pid = msg->pid;
1264 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
1265 lta->key.sock = sock;
1266 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
1267
1268 rcu_read_lock();
1269 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1270 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
1271 rcu_read_unlock();
1272
1273 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1274 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1275 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1276
1277 return 0;
1278 }
1279
1280 /*
1281 * Unregister app by removing it from the global traceable app list and freeing
1282 * the data struct.
1283 *
1284 * The socket is already closed at this point so no close to sock.
1285 */
1286 void ust_app_unregister(int sock)
1287 {
1288 struct ust_app *lta;
1289 struct lttng_ht_node_ulong *node;
1290 struct lttng_ht_iter iter;
1291 int ret;
1292
1293 rcu_read_lock();
1294 lta = find_app_by_sock(sock);
1295 if (lta == NULL) {
1296 ERR("Unregister app sock %d not found!", sock);
1297 goto error;
1298 }
1299
1300 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1301
1302 /* Remove application from socket hash table */
1303 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1304 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1305 assert(!ret);
1306
1307 /* Get the node reference for a call_rcu */
1308 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1309 node = lttng_ht_iter_get_node_ulong(&iter);
1310 if (node == NULL) {
1311 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1312 goto error;
1313 }
1314
1315 /* Remove application from PID hash table */
1316 ret = lttng_ht_del(ust_app_ht, &iter);
1317 assert(!ret);
1318 call_rcu(&node->head, delete_ust_app_rcu);
1319 error:
1320 rcu_read_unlock();
1321 return;
1322 }
1323
1324 /*
1325 * Return traceable_app_count
1326 */
1327 unsigned long ust_app_list_count(void)
1328 {
1329 unsigned long count;
1330
1331 rcu_read_lock();
1332 count = lttng_ht_get_count(ust_app_ht);
1333 rcu_read_unlock();
1334
1335 return count;
1336 }
1337
1338 /*
1339 * Fill events array with all events name of all registered apps.
1340 */
1341 int ust_app_list_events(struct lttng_event **events)
1342 {
1343 int ret, handle;
1344 size_t nbmem, count = 0;
1345 struct lttng_ht_iter iter;
1346 struct ust_app *app;
1347 struct lttng_event *tmp;
1348
1349 nbmem = UST_APP_EVENT_LIST_SIZE;
1350 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1351 if (tmp == NULL) {
1352 PERROR("zmalloc ust app events");
1353 ret = -ENOMEM;
1354 goto error;
1355 }
1356
1357 rcu_read_lock();
1358
1359 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1360 struct lttng_ust_tracepoint_iter uiter;
1361
1362 handle = ustctl_tracepoint_list(app->key.sock);
1363 if (handle < 0) {
1364 ERR("UST app list events getting handle failed for app pid %d",
1365 app->key.pid);
1366 continue;
1367 }
1368
1369 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1370 &uiter)) != -ENOENT) {
1371 if (count >= nbmem) {
1372 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1373 2 * nbmem);
1374 nbmem *= 2;
1375 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1376 if (tmp == NULL) {
1377 PERROR("realloc ust app events");
1378 ret = -ENOMEM;
1379 goto rcu_error;
1380 }
1381 }
1382 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1383 memcpy(tmp[count].loglevel, uiter.loglevel, LTTNG_UST_SYM_NAME_LEN);
1384 tmp[count].loglevel_value = uiter.loglevel_value;
1385 tmp[count].type = LTTNG_UST_TRACEPOINT;
1386 tmp[count].pid = app->key.pid;
1387 tmp[count].enabled = -1;
1388 count++;
1389 }
1390 }
1391
1392 ret = count;
1393 *events = tmp;
1394
1395 DBG2("UST app list events done (%zu events)", count);
1396
1397 rcu_error:
1398 rcu_read_unlock();
1399 error:
1400 return ret;
1401 }
1402
1403 /*
1404 * Free and clean all traceable apps of the global list.
1405 */
1406 void ust_app_clean_list(void)
1407 {
1408 int ret;
1409 struct lttng_ht_iter iter;
1410 struct lttng_ht_node_ulong *node;
1411
1412 DBG2("UST app cleaning registered apps hash table");
1413
1414 rcu_read_lock();
1415
1416 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1417 ret = lttng_ht_del(ust_app_ht, &iter);
1418 assert(!ret);
1419 call_rcu(&node->head, delete_ust_app_rcu);
1420 }
1421 /* Destroy is done only when the ht is empty */
1422 lttng_ht_destroy(ust_app_ht);
1423
1424 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1425 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1426 assert(!ret);
1427 }
1428 /* Destroy is done only when the ht is empty */
1429 lttng_ht_destroy(ust_app_sock_key_map);
1430
1431 rcu_read_unlock();
1432 }
1433
1434 /*
1435 * Init UST app hash table.
1436 */
1437 void ust_app_ht_alloc(void)
1438 {
1439 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1440 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1441 }
1442
1443 /*
1444 * For a specific UST session, disable the channel for all registered apps.
1445 */
1446 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1447 struct ltt_ust_channel *uchan)
1448 {
1449 int ret = 0;
1450 struct lttng_ht_iter iter;
1451 struct lttng_ht_node_str *ua_chan_node;
1452 struct ust_app *app;
1453 struct ust_app_session *ua_sess;
1454 struct ust_app_channel *ua_chan;
1455
1456 if (usess == NULL || uchan == NULL) {
1457 ERR("Disabling UST global channel with NULL values");
1458 ret = -1;
1459 goto error;
1460 }
1461
1462 DBG2("UST app disabling channel %s from global domain for session id %d",
1463 uchan->name, usess->id);
1464
1465 rcu_read_lock();
1466
1467 /* For every registered applications */
1468 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1469 struct lttng_ht_iter uiter;
1470 ua_sess = lookup_session_by_app(usess, app);
1471 if (ua_sess == NULL) {
1472 continue;
1473 }
1474
1475 /* Get channel */
1476 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1477 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1478 /* If the session if found for the app, the channel must be there */
1479 assert(ua_chan_node);
1480
1481 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1482 /* The channel must not be already disabled */
1483 assert(ua_chan->enabled == 1);
1484
1485 /* Disable channel onto application */
1486 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1487 if (ret < 0) {
1488 /* XXX: We might want to report this error at some point... */
1489 continue;
1490 }
1491 }
1492
1493 rcu_read_unlock();
1494
1495 error:
1496 return ret;
1497 }
1498
1499 /*
1500 * For a specific UST session, enable the channel for all registered apps.
1501 */
1502 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1503 struct ltt_ust_channel *uchan)
1504 {
1505 int ret = 0;
1506 struct lttng_ht_iter iter;
1507 struct ust_app *app;
1508 struct ust_app_session *ua_sess;
1509
1510 if (usess == NULL || uchan == NULL) {
1511 ERR("Adding UST global channel to NULL values");
1512 ret = -1;
1513 goto error;
1514 }
1515
1516 DBG2("UST app enabling channel %s to global domain for session id %d",
1517 uchan->name, usess->id);
1518
1519 rcu_read_lock();
1520
1521 /* For every registered applications */
1522 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1523 ua_sess = lookup_session_by_app(usess, app);
1524 if (ua_sess == NULL) {
1525 continue;
1526 }
1527
1528 /* Enable channel onto application */
1529 ret = enable_ust_app_channel(ua_sess, uchan, app);
1530 if (ret < 0) {
1531 /* XXX: We might want to report this error at some point... */
1532 continue;
1533 }
1534 }
1535
1536 rcu_read_unlock();
1537
1538 error:
1539 return ret;
1540 }
1541
1542 /*
1543 * Disable an event in a channel and for a specific session.
1544 */
1545 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1546 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1547 {
1548 int ret = 0;
1549 struct lttng_ht_iter iter, uiter;
1550 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1551 struct ust_app *app;
1552 struct ust_app_session *ua_sess;
1553 struct ust_app_channel *ua_chan;
1554 struct ust_app_event *ua_event;
1555
1556 DBG("UST app disabling event %s for all apps in channel "
1557 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1558
1559 rcu_read_lock();
1560
1561 /* For all registered applications */
1562 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1563 ua_sess = lookup_session_by_app(usess, app);
1564 if (ua_sess == NULL) {
1565 /* Next app */
1566 continue;
1567 }
1568
1569 /* Lookup channel in the ust app session */
1570 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1571 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1572 if (ua_chan_node == NULL) {
1573 DBG2("Channel %s not found in session id %d for app pid %d."
1574 "Skipping", uchan->name, usess->id, app->key.pid);
1575 continue;
1576 }
1577 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1578
1579 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1580 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1581 if (ua_event_node == NULL) {
1582 DBG2("Event %s not found in channel %s for app pid %d."
1583 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1584 continue;
1585 }
1586 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1587
1588 ret = disable_ust_app_event(ua_sess, ua_event, app);
1589 if (ret < 0) {
1590 /* XXX: Report error someday... */
1591 continue;
1592 }
1593 }
1594
1595 rcu_read_unlock();
1596
1597 return ret;
1598 }
1599
1600 /*
1601 * For a specific UST session and UST channel, the event for all
1602 * registered apps.
1603 */
1604 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1605 struct ltt_ust_channel *uchan)
1606 {
1607 int ret = 0;
1608 struct lttng_ht_iter iter, uiter;
1609 struct lttng_ht_node_str *ua_chan_node;
1610 struct ust_app *app;
1611 struct ust_app_session *ua_sess;
1612 struct ust_app_channel *ua_chan;
1613 struct ust_app_event *ua_event;
1614
1615 DBG("UST app disabling all event for all apps in channel "
1616 "%s for session id %d", uchan->name, usess->id);
1617
1618 rcu_read_lock();
1619
1620 /* For all registered applications */
1621 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1622 ua_sess = lookup_session_by_app(usess, app);
1623 /* If ua_sess is NULL, there is a code flow error */
1624 assert(ua_sess);
1625
1626 /* Lookup channel in the ust app session */
1627 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1628 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1629 /* If the channel is not found, there is a code flow error */
1630 assert(ua_chan_node);
1631
1632 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1633
1634 /* Disable each events of channel */
1635 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1636 node.node) {
1637 ret = disable_ust_app_event(ua_sess, ua_event, app);
1638 if (ret < 0) {
1639 /* XXX: Report error someday... */
1640 continue;
1641 }
1642 }
1643 }
1644
1645 rcu_read_unlock();
1646
1647 return ret;
1648 }
1649
1650 /*
1651 * For a specific UST session, create the channel for all registered apps.
1652 */
1653 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1654 struct ltt_ust_channel *uchan)
1655 {
1656 int ret = 0;
1657 struct lttng_ht_iter iter;
1658 struct ust_app *app;
1659 struct ust_app_session *ua_sess;
1660 struct ust_app_channel *ua_chan;
1661
1662 if (usess == NULL || uchan == NULL) {
1663 ERR("Adding UST global channel to NULL values");
1664 ret = -1;
1665 goto error;
1666 }
1667
1668 DBG2("UST app adding channel %s to global domain for session id %d",
1669 uchan->name, usess->id);
1670
1671 rcu_read_lock();
1672
1673 /* For every registered applications */
1674 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1675 /*
1676 * Create session on the tracer side and add it to app session HT. Note
1677 * that if session exist, it will simply return a pointer to the ust
1678 * app session.
1679 */
1680 ua_sess = create_ust_app_session(usess, app);
1681 if (ua_sess == NULL) {
1682 continue;
1683 }
1684
1685 /* Create channel onto application */
1686 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1687 if (ua_chan == NULL) {
1688 continue;
1689 }
1690 }
1691
1692 rcu_read_unlock();
1693
1694 error:
1695 return ret;
1696 }
1697
1698 /*
1699 * Enable event for a specific session and channel on the tracer.
1700 */
1701 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1702 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1703 {
1704 int ret = 0;
1705 struct lttng_ht_iter iter, uiter;
1706 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1707 struct ust_app *app;
1708 struct ust_app_session *ua_sess;
1709 struct ust_app_channel *ua_chan;
1710 struct ust_app_event *ua_event;
1711
1712 DBG("UST app enabling event %s for all apps for session id %d",
1713 uevent->attr.name, usess->id);
1714
1715 /*
1716 * NOTE: At this point, this function is called only if the session and
1717 * channel passed are already created for all apps. and enabled on the
1718 * tracer also.
1719 */
1720
1721 rcu_read_lock();
1722
1723 /* For all registered applications */
1724 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1725 ua_sess = lookup_session_by_app(usess, app);
1726 /* If ua_sess is NULL, there is a code flow error */
1727 assert(ua_sess);
1728
1729 /* Lookup channel in the ust app session */
1730 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1731 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1732 /* If the channel is not found, there is a code flow error */
1733 assert(ua_chan_node);
1734
1735 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1736
1737 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1738 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1739 if (ua_event_node == NULL) {
1740 DBG3("UST app enable event %s not found for app PID %d."
1741 "Skipping app", uevent->attr.name, app->key.pid);
1742 continue;
1743 }
1744 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1745
1746 ret = enable_ust_app_event(ua_sess, ua_event, app);
1747 if (ret < 0) {
1748 goto error;
1749 }
1750 }
1751
1752 error:
1753 rcu_read_unlock();
1754 return ret;
1755 }
1756
1757 /*
1758 * For a specific existing UST session and UST channel, creates the event for
1759 * all registered apps.
1760 */
1761 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1762 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1763 {
1764 int ret = 0;
1765 struct lttng_ht_iter iter, uiter;
1766 struct lttng_ht_node_str *ua_chan_node;
1767 struct ust_app *app;
1768 struct ust_app_session *ua_sess;
1769 struct ust_app_channel *ua_chan;
1770
1771 DBG("UST app creating event %s for all apps for session id %d",
1772 uevent->attr.name, usess->id);
1773
1774 /*
1775 * NOTE: At this point, this function is called only if the session and
1776 * channel passed are already created for all apps. and enabled on the
1777 * tracer also.
1778 */
1779
1780 rcu_read_lock();
1781
1782 /* For all registered applications */
1783 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1784 ua_sess = lookup_session_by_app(usess, app);
1785 /* If ua_sess is NULL, there is a code flow error */
1786 assert(ua_sess);
1787
1788 /* Lookup channel in the ust app session */
1789 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1790 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1791 /* If the channel is not found, there is a code flow error */
1792 assert(ua_chan_node);
1793
1794 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1795
1796 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1797 if (ret < 0) {
1798 continue;
1799 }
1800 }
1801
1802 rcu_read_unlock();
1803
1804 return ret;
1805 }
1806
1807 /*
1808 * Start tracing for a specific UST session and app.
1809 */
1810 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1811 {
1812 int ret = 0;
1813 struct lttng_ht_iter iter;
1814 struct ust_app_session *ua_sess;
1815 struct ust_app_channel *ua_chan;
1816 struct ltt_ust_stream *ustream;
1817 int consumerd_fd;
1818
1819 DBG("Starting tracing for ust app pid %d", app->key.pid);
1820
1821 rcu_read_lock();
1822
1823 ua_sess = lookup_session_by_app(usess, app);
1824 if (ua_sess == NULL) {
1825 goto error_rcu_unlock;
1826 }
1827
1828 /* Upon restart, we skip the setup, already done */
1829 if (ua_sess->started) {
1830 goto skip_setup;
1831 }
1832
1833 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1834 if (ret < 0) {
1835 goto error_rcu_unlock;
1836 }
1837
1838 /* For each channel */
1839 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1840 node.node) {
1841 /* Create all streams */
1842 while (1) {
1843 /* Create UST stream */
1844 ustream = zmalloc(sizeof(*ustream));
1845 if (ustream == NULL) {
1846 PERROR("zmalloc ust stream");
1847 goto error_rcu_unlock;
1848 }
1849
1850 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1851 &ustream->obj);
1852 if (ret < 0) {
1853 /* Got all streams */
1854 break;
1855 }
1856 ustream->handle = ustream->obj->handle;
1857
1858 /* Order is important */
1859 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1860 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1861 ua_sess->path, ua_chan->name,
1862 ua_chan->streams.count++);
1863 if (ret < 0) {
1864 PERROR("asprintf UST create stream");
1865 continue;
1866 }
1867 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1868 ustream->pathname);
1869 }
1870 }
1871
1872 switch (app->bits_per_long) {
1873 case 64:
1874 consumerd_fd = ust_consumerd64_fd;
1875 break;
1876 case 32:
1877 consumerd_fd = ust_consumerd32_fd;
1878 break;
1879 default:
1880 ret = -EINVAL;
1881 goto error_rcu_unlock;
1882 }
1883
1884 /* Setup UST consumer socket and send fds to it */
1885 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1886 if (ret < 0) {
1887 goto error_rcu_unlock;
1888 }
1889 ua_sess->started = 1;
1890
1891 skip_setup:
1892 /* This start the UST tracing */
1893 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1894 if (ret < 0) {
1895 ERR("Error starting tracing for app pid: %d", app->key.pid);
1896 goto error_rcu_unlock;
1897 }
1898
1899 rcu_read_unlock();
1900
1901 /* Quiescent wait after starting trace */
1902 ustctl_wait_quiescent(app->key.sock);
1903
1904 return 0;
1905
1906 error_rcu_unlock:
1907 rcu_read_unlock();
1908 return -1;
1909 }
1910
1911 /*
1912 * Stop tracing for a specific UST session and app.
1913 */
1914 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1915 {
1916 int ret = 0;
1917 struct lttng_ht_iter iter;
1918 struct ust_app_session *ua_sess;
1919 struct ust_app_channel *ua_chan;
1920
1921 DBG("Stopping tracing for ust app pid %d", app->key.pid);
1922
1923 rcu_read_lock();
1924
1925 ua_sess = lookup_session_by_app(usess, app);
1926 if (ua_sess == NULL) {
1927 /* Only malloc can failed so something is really wrong */
1928 goto error_rcu_unlock;
1929 }
1930
1931 /* This inhibits UST tracing */
1932 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1933 if (ret < 0) {
1934 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1935 goto error_rcu_unlock;
1936 }
1937
1938 /* Quiescent wait after stopping trace */
1939 ustctl_wait_quiescent(app->key.sock);
1940
1941 /* Flushing buffers */
1942 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1943 node.node) {
1944 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
1945 if (ret < 0) {
1946 ERR("UST app PID %d channel %s flush failed",
1947 app->key.pid, ua_chan->name);
1948 ERR("Ended with ret %d", ret);
1949 /* Continuing flushing all buffers */
1950 continue;
1951 }
1952 }
1953
1954 /* Flush all buffers before stopping */
1955 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
1956 if (ret < 0) {
1957 ERR("UST app PID %d metadata flush failed", app->key.pid);
1958 ERR("Ended with ret %d", ret);
1959 }
1960
1961 rcu_read_unlock();
1962
1963 return 0;
1964
1965 error_rcu_unlock:
1966 rcu_read_unlock();
1967 return -1;
1968 }
1969
1970 /*
1971 * Destroy a specific UST session in apps.
1972 */
1973 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
1974 {
1975 struct ust_app_session *ua_sess;
1976 struct lttng_ust_object_data obj;
1977 struct lttng_ht_iter iter;
1978 struct lttng_ht_node_ulong *node;
1979 int ret;
1980
1981 DBG("Destroy tracing for ust app pid %d", app->key.pid);
1982
1983 rcu_read_lock();
1984
1985 __lookup_session_by_app(usess, app, &iter);
1986 node = lttng_ht_iter_get_node_ulong(&iter);
1987 if (node == NULL) {
1988 /* Only malloc can failed so something is really wrong */
1989 goto error_rcu_unlock;
1990 }
1991 ua_sess = caa_container_of(node, struct ust_app_session, node);
1992 ret = lttng_ht_del(app->sessions, &iter);
1993 assert(!ret);
1994 delete_ust_app_session(app->key.sock, ua_sess);
1995 obj.handle = ua_sess->handle;
1996 obj.shm_fd = -1;
1997 obj.wait_fd = -1;
1998 obj.memory_map_size = 0;
1999 ustctl_release_object(app->key.sock, &obj);
2000
2001 rcu_read_unlock();
2002
2003 /* Quiescent wait after stopping trace */
2004 ustctl_wait_quiescent(app->key.sock);
2005
2006 return 0;
2007
2008 error_rcu_unlock:
2009 rcu_read_unlock();
2010 return -1;
2011 }
2012
2013 /*
2014 * Start tracing for the UST session.
2015 */
2016 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2017 {
2018 int ret = 0;
2019 struct lttng_ht_iter iter;
2020 struct ust_app *app;
2021
2022 DBG("Starting all UST traces");
2023
2024 rcu_read_lock();
2025
2026 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2027 ret = ust_app_start_trace(usess, app);
2028 if (ret < 0) {
2029 /* Continue to next apps even on error */
2030 continue;
2031 }
2032 }
2033
2034 rcu_read_unlock();
2035
2036 return 0;
2037 }
2038
2039 /*
2040 * Start tracing for the UST session.
2041 */
2042 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2043 {
2044 int ret = 0;
2045 struct lttng_ht_iter iter;
2046 struct ust_app *app;
2047
2048 DBG("Stopping all UST traces");
2049
2050 rcu_read_lock();
2051
2052 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2053 ret = ust_app_stop_trace(usess, app);
2054 if (ret < 0) {
2055 /* Continue to next apps even on error */
2056 continue;
2057 }
2058 }
2059
2060 rcu_read_unlock();
2061
2062 return 0;
2063 }
2064
2065 /*
2066 * Destroy app UST session.
2067 */
2068 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2069 {
2070 int ret = 0;
2071 struct lttng_ht_iter iter;
2072 struct ust_app *app;
2073
2074 DBG("Destroy all UST traces");
2075
2076 rcu_read_lock();
2077
2078 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2079 ret = ust_app_destroy_trace(usess, app);
2080 if (ret < 0) {
2081 /* Continue to next apps even on error */
2082 continue;
2083 }
2084 }
2085
2086 rcu_read_unlock();
2087
2088 return 0;
2089 }
2090
2091 /*
2092 * Add channels/events from UST global domain to registered apps at sock.
2093 */
2094 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2095 {
2096 int ret = 0;
2097 struct lttng_ht_iter iter, uiter;
2098 struct ust_app *app;
2099 struct ust_app_session *ua_sess;
2100 struct ust_app_channel *ua_chan;
2101 struct ust_app_event *ua_event;
2102
2103 if (usess == NULL) {
2104 ERR("No UST session on global update. Returning");
2105 goto error;
2106 }
2107
2108 DBG2("UST app global update for app sock %d for session id %d", sock,
2109 usess->id);
2110
2111 rcu_read_lock();
2112
2113 app = find_app_by_sock(sock);
2114 if (app == NULL) {
2115 ERR("Failed to update app sock %d", sock);
2116 goto error;
2117 }
2118
2119 ua_sess = create_ust_app_session(usess, app);
2120 if (ua_sess == NULL) {
2121 goto error;
2122 }
2123
2124 /*
2125 * We can iterate safely here over all UST app session sicne the create ust
2126 * app session above made a shadow copy of the UST global domain from the
2127 * ltt ust session.
2128 */
2129 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2130 node.node) {
2131 ret = create_ust_channel(app, ua_sess, ua_chan);
2132 if (ret < 0) {
2133 /* FIXME: Should we quit here or continue... */
2134 continue;
2135 }
2136
2137 /* For each events */
2138 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2139 node.node) {
2140 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2141 if (ret < 0) {
2142 /* FIXME: Should we quit here or continue... */
2143 continue;
2144 }
2145 }
2146 }
2147
2148 if (usess->start_trace) {
2149 ret = ust_app_start_trace(usess, app);
2150 if (ret < 0) {
2151 goto error;
2152 }
2153
2154 DBG2("UST trace started for app pid %d", app->key.pid);
2155 }
2156
2157 error:
2158 rcu_read_unlock();
2159 return;
2160 }
2161
2162 /*
2163 * Add context to a specific channel for global UST domain.
2164 */
2165 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2166 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2167 {
2168 int ret = 0;
2169 struct lttng_ht_node_str *ua_chan_node;
2170 struct lttng_ht_iter iter, uiter;
2171 struct ust_app_channel *ua_chan = NULL;
2172 struct ust_app_session *ua_sess;
2173 struct ust_app *app;
2174
2175 rcu_read_lock();
2176
2177 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2178 ua_sess = lookup_session_by_app(usess, app);
2179 if (ua_sess == NULL) {
2180 continue;
2181 }
2182
2183 /* Lookup channel in the ust app session */
2184 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2185 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2186 if (ua_chan_node == NULL) {
2187 continue;
2188 }
2189 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2190 node);
2191
2192 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2193 if (ret < 0) {
2194 continue;
2195 }
2196 }
2197
2198 rcu_read_unlock();
2199 return ret;
2200 }
2201
2202 /*
2203 * Add context to a specific event in a channel for global UST domain.
2204 */
2205 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2206 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2207 struct ltt_ust_context *uctx)
2208 {
2209 int ret = 0;
2210 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2211 struct lttng_ht_iter iter, uiter;
2212 struct ust_app_session *ua_sess;
2213 struct ust_app_event *ua_event;
2214 struct ust_app_channel *ua_chan = NULL;
2215 struct ust_app *app;
2216
2217 rcu_read_lock();
2218
2219 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2220 ua_sess = lookup_session_by_app(usess, app);
2221 if (ua_sess == NULL) {
2222 continue;
2223 }
2224
2225 /* Lookup channel in the ust app session */
2226 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2227 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2228 if (ua_chan_node == NULL) {
2229 continue;
2230 }
2231 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2232 node);
2233
2234 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2235 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2236 if (ua_event_node == NULL) {
2237 continue;
2238 }
2239 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2240 node);
2241
2242 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2243 if (ret < 0) {
2244 continue;
2245 }
2246 }
2247
2248 rcu_read_unlock();
2249 return ret;
2250 }
2251
2252 /*
2253 * Enable event for a channel from a UST session for a specific PID.
2254 */
2255 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2256 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2257 {
2258 int ret = 0;
2259 struct lttng_ht_iter iter;
2260 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2261 struct ust_app *app;
2262 struct ust_app_session *ua_sess;
2263 struct ust_app_channel *ua_chan;
2264 struct ust_app_event *ua_event;
2265
2266 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2267
2268 rcu_read_lock();
2269
2270 app = ust_app_find_by_pid(pid);
2271 if (app == NULL) {
2272 ERR("UST app enable event per PID %d not found", pid);
2273 ret = -1;
2274 goto error;
2275 }
2276
2277 ua_sess = lookup_session_by_app(usess, app);
2278 /* If ua_sess is NULL, there is a code flow error */
2279 assert(ua_sess);
2280
2281 /* Lookup channel in the ust app session */
2282 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2283 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2284 /* If the channel is not found, there is a code flow error */
2285 assert(ua_chan_node);
2286
2287 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2288
2289 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2290 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2291 if (ua_event_node == NULL) {
2292 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2293 if (ret < 0) {
2294 goto error;
2295 }
2296 } else {
2297 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2298
2299 ret = enable_ust_app_event(ua_sess, ua_event, app);
2300 if (ret < 0) {
2301 goto error;
2302 }
2303 }
2304
2305 error:
2306 rcu_read_unlock();
2307 return ret;
2308 }
2309
2310 /*
2311 * Disable event for a channel from a UST session for a specific PID.
2312 */
2313 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2314 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2315 {
2316 int ret = 0;
2317 struct lttng_ht_iter iter;
2318 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2319 struct ust_app *app;
2320 struct ust_app_session *ua_sess;
2321 struct ust_app_channel *ua_chan;
2322 struct ust_app_event *ua_event;
2323
2324 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2325
2326 rcu_read_lock();
2327
2328 app = ust_app_find_by_pid(pid);
2329 if (app == NULL) {
2330 ERR("UST app disable event per PID %d not found", pid);
2331 ret = -1;
2332 goto error;
2333 }
2334
2335 ua_sess = lookup_session_by_app(usess, app);
2336 /* If ua_sess is NULL, there is a code flow error */
2337 assert(ua_sess);
2338
2339 /* Lookup channel in the ust app session */
2340 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2341 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2342 if (ua_chan_node == NULL) {
2343 /* Channel does not exist, skip disabling */
2344 goto error;
2345 }
2346 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2347
2348 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2349 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2350 if (ua_event_node == NULL) {
2351 /* Event does not exist, skip disabling */
2352 goto error;
2353 }
2354 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2355
2356 ret = disable_ust_app_event(ua_sess, ua_event, app);
2357 if (ret < 0) {
2358 goto error;
2359 }
2360
2361 error:
2362 rcu_read_unlock();
2363 return ret;
2364 }
LTTng 2.0 tools and control repository
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