8e6d20e86d8f19dec7d63d1a1a7b2e155ef86153
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <errno.h>
20 #include <pthread.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <urcu/compiler.h>
28
29 #include <common/common.h>
30
31 #include "ust-app.h"
32 #include "ust-consumer.h"
33 #include "ust-ctl.h"
34
35 /*
36 * Delete ust context safely. RCU read lock must be held before calling
37 * this function.
38 */
39 static
40 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
41 {
42 if (ua_ctx->obj) {
43 ustctl_release_object(sock, ua_ctx->obj);
44 free(ua_ctx->obj);
45 }
46 free(ua_ctx);
47 }
48
49 /*
50 * Delete ust app event safely. RCU read lock must be held before calling
51 * this function.
52 */
53 static
54 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
55 {
56 int ret;
57 struct lttng_ht_iter iter;
58 struct ust_app_ctx *ua_ctx;
59
60 /* Destroy each context of event */
61 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
62 node.node) {
63 ret = lttng_ht_del(ua_event->ctx, &iter);
64 assert(!ret);
65 delete_ust_app_ctx(sock, ua_ctx);
66 }
67 lttng_ht_destroy(ua_event->ctx);
68
69 if (ua_event->obj != NULL) {
70 ustctl_release_object(sock, ua_event->obj);
71 free(ua_event->obj);
72 }
73 free(ua_event);
74 }
75
76 /*
77 * Delete ust app stream safely. RCU read lock must be held before calling
78 * this function.
79 */
80 static
81 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
82 {
83 if (stream->obj) {
84 ustctl_release_object(sock, stream->obj);
85 free(stream->obj);
86 }
87 free(stream);
88 }
89
90 /*
91 * Delete ust app channel safely. RCU read lock must be held before calling
92 * this function.
93 */
94 static
95 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
96 {
97 int ret;
98 struct lttng_ht_iter iter;
99 struct ust_app_event *ua_event;
100 struct ust_app_ctx *ua_ctx;
101 struct ltt_ust_stream *stream, *stmp;
102
103 /* Wipe stream */
104 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
105 cds_list_del(&stream->list);
106 delete_ust_app_stream(sock, stream);
107 }
108
109 /* Wipe context */
110 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
111 ret = lttng_ht_del(ua_chan->ctx, &iter);
112 assert(!ret);
113 delete_ust_app_ctx(sock, ua_ctx);
114 }
115 lttng_ht_destroy(ua_chan->ctx);
116
117 /* Wipe events */
118 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
119 node.node) {
120 ret = lttng_ht_del(ua_chan->events, &iter);
121 assert(!ret);
122 delete_ust_app_event(sock, ua_event);
123 }
124 lttng_ht_destroy(ua_chan->events);
125
126 if (ua_chan->obj != NULL) {
127 ustctl_release_object(sock, ua_chan->obj);
128 free(ua_chan->obj);
129 }
130 free(ua_chan);
131 }
132
133 /*
134 * Delete ust app session safely. RCU read lock must be held before calling
135 * this function.
136 */
137 static
138 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
139 {
140 int ret;
141 struct lttng_ht_iter iter;
142 struct ust_app_channel *ua_chan;
143
144 if (ua_sess->metadata) {
145 if (ua_sess->metadata->stream_obj) {
146 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
147 free(ua_sess->metadata->stream_obj);
148 }
149 if (ua_sess->metadata->obj) {
150 ustctl_release_object(sock, ua_sess->metadata->obj);
151 free(ua_sess->metadata->obj);
152 }
153 }
154
155 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
156 node.node) {
157 ret = lttng_ht_del(ua_sess->channels, &iter);
158 assert(!ret);
159 delete_ust_app_channel(sock, ua_chan);
160 }
161 lttng_ht_destroy(ua_sess->channels);
162
163 if (ua_sess->handle != -1) {
164 ustctl_release_handle(sock, ua_sess->handle);
165 }
166 free(ua_sess);
167 }
168
169 /*
170 * Delete a traceable application structure from the global list. Never call
171 * this function outside of a call_rcu call.
172 */
173 static
174 void delete_ust_app(struct ust_app *app)
175 {
176 int ret, sock;
177 struct lttng_ht_iter iter;
178 struct ust_app_session *ua_sess;
179
180 rcu_read_lock();
181
182 /* Delete ust app sessions info */
183 sock = app->key.sock;
184 app->key.sock = -1;
185
186 /* Wipe sessions */
187 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
188 node.node) {
189 ret = lttng_ht_del(app->sessions, &iter);
190 assert(!ret);
191 delete_ust_app_session(app->key.sock, ua_sess);
192 }
193 lttng_ht_destroy(app->sessions);
194
195 /*
196 * Wait until we have removed the key from the sock hash table before
197 * closing this socket, otherwise an application could re-use the socket ID
198 * and race with the teardown, using the same hash table entry.
199 */
200 ret = close(sock);
201 if (ret) {
202 PERROR("close");
203 }
204
205 DBG2("UST app pid %d deleted", app->key.pid);
206 free(app);
207
208 rcu_read_unlock();
209 }
210
211 /*
212 * URCU intermediate call to delete an UST app.
213 */
214 static
215 void delete_ust_app_rcu(struct rcu_head *head)
216 {
217 struct lttng_ht_node_ulong *node =
218 caa_container_of(head, struct lttng_ht_node_ulong, head);
219 struct ust_app *app =
220 caa_container_of(node, struct ust_app, node);
221
222 DBG3("Call RCU deleting app PID %d", app->key.pid);
223 delete_ust_app(app);
224 }
225
226 /*
227 * Alloc new UST app session.
228 */
229 static
230 struct ust_app_session *alloc_ust_app_session(void)
231 {
232 struct ust_app_session *ua_sess;
233
234 /* Init most of the default value by allocating and zeroing */
235 ua_sess = zmalloc(sizeof(struct ust_app_session));
236 if (ua_sess == NULL) {
237 PERROR("malloc");
238 goto error;
239 }
240
241 ua_sess->handle = -1;
242 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
243
244 return ua_sess;
245
246 error:
247 return NULL;
248 }
249
250 /*
251 * Alloc new UST app channel.
252 */
253 static
254 struct ust_app_channel *alloc_ust_app_channel(char *name,
255 struct lttng_ust_channel *attr)
256 {
257 struct ust_app_channel *ua_chan;
258
259 /* Init most of the default value by allocating and zeroing */
260 ua_chan = zmalloc(sizeof(struct ust_app_channel));
261 if (ua_chan == NULL) {
262 PERROR("malloc");
263 goto error;
264 }
265
266 /* Setup channel name */
267 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
268 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
269
270 ua_chan->enabled = 1;
271 ua_chan->handle = -1;
272 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
273 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
274 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
275
276 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
277
278 /* Copy attributes */
279 if (attr) {
280 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
281 }
282
283 DBG3("UST app channel %s allocated", ua_chan->name);
284
285 return ua_chan;
286
287 error:
288 return NULL;
289 }
290
291 /*
292 * Alloc new UST app event.
293 */
294 static
295 struct ust_app_event *alloc_ust_app_event(char *name,
296 struct lttng_ust_event *attr)
297 {
298 struct ust_app_event *ua_event;
299
300 /* Init most of the default value by allocating and zeroing */
301 ua_event = zmalloc(sizeof(struct ust_app_event));
302 if (ua_event == NULL) {
303 PERROR("malloc");
304 goto error;
305 }
306
307 ua_event->enabled = 1;
308 strncpy(ua_event->name, name, sizeof(ua_event->name));
309 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
310 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
311 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
312
313 /* Copy attributes */
314 if (attr) {
315 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
316 }
317
318 DBG3("UST app event %s allocated", ua_event->name);
319
320 return ua_event;
321
322 error:
323 return NULL;
324 }
325
326 /*
327 * Alloc new UST app context.
328 */
329 static
330 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
331 {
332 struct ust_app_ctx *ua_ctx;
333
334 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
335 if (ua_ctx == NULL) {
336 goto error;
337 }
338
339 if (uctx) {
340 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
341 }
342
343 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
344
345 error:
346 return ua_ctx;
347 }
348
349 /*
350 * Find an ust_app using the sock and return it. RCU read side lock must be
351 * held before calling this helper function.
352 */
353 static
354 struct ust_app *find_app_by_sock(int sock)
355 {
356 struct lttng_ht_node_ulong *node;
357 struct ust_app_key *key;
358 struct lttng_ht_iter iter;
359
360 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
361 &iter);
362 node = lttng_ht_iter_get_node_ulong(&iter);
363 if (node == NULL) {
364 DBG2("UST app find by sock %d key not found", sock);
365 goto error;
366 }
367 key = caa_container_of(node, struct ust_app_key, node);
368
369 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
370 node = lttng_ht_iter_get_node_ulong(&iter);
371 if (node == NULL) {
372 DBG2("UST app find by sock %d not found", sock);
373 goto error;
374 }
375 return caa_container_of(node, struct ust_app, node);
376
377 error:
378 return NULL;
379 }
380
381 /*
382 * Create the channel context on the tracer.
383 */
384 static
385 int create_ust_channel_context(struct ust_app_channel *ua_chan,
386 struct ust_app_ctx *ua_ctx, struct ust_app *app)
387 {
388 int ret;
389
390 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
391 ua_chan->obj, &ua_ctx->obj);
392 if (ret < 0) {
393 goto error;
394 }
395
396 ua_ctx->handle = ua_ctx->obj->handle;
397
398 DBG2("UST app context created successfully for channel %s", ua_chan->name);
399
400 error:
401 return ret;
402 }
403
404 /*
405 * Create the event context on the tracer.
406 */
407 static
408 int create_ust_event_context(struct ust_app_event *ua_event,
409 struct ust_app_ctx *ua_ctx, struct ust_app *app)
410 {
411 int ret;
412
413 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
414 ua_event->obj, &ua_ctx->obj);
415 if (ret < 0) {
416 goto error;
417 }
418
419 ua_ctx->handle = ua_ctx->obj->handle;
420
421 DBG2("UST app context created successfully for event %s", ua_event->name);
422
423 error:
424 return ret;
425 }
426
427 /*
428 * Disable the specified event on to UST tracer for the UST session.
429 */
430 static int disable_ust_event(struct ust_app *app,
431 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
432 {
433 int ret;
434
435 ret = ustctl_disable(app->key.sock, ua_event->obj);
436 if (ret < 0) {
437 ERR("UST app event %s disable failed for app (pid: %d) "
438 "and session handle %d with ret %d",
439 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
440 goto error;
441 }
442
443 DBG2("UST app event %s disabled successfully for app (pid: %d)",
444 ua_event->attr.name, app->key.pid);
445
446 error:
447 return ret;
448 }
449
450 /*
451 * Disable the specified channel on to UST tracer for the UST session.
452 */
453 static int disable_ust_channel(struct ust_app *app,
454 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
455 {
456 int ret;
457
458 ret = ustctl_disable(app->key.sock, ua_chan->obj);
459 if (ret < 0) {
460 ERR("UST app channel %s disable failed for app (pid: %d) "
461 "and session handle %d with ret %d",
462 ua_chan->name, app->key.pid, ua_sess->handle, ret);
463 goto error;
464 }
465
466 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
467 ua_chan->name, app->key.pid);
468
469 error:
470 return ret;
471 }
472
473 /*
474 * Enable the specified channel on to UST tracer for the UST session.
475 */
476 static int enable_ust_channel(struct ust_app *app,
477 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
478 {
479 int ret;
480
481 ret = ustctl_enable(app->key.sock, ua_chan->obj);
482 if (ret < 0) {
483 ERR("UST app channel %s enable failed for app (pid: %d) "
484 "and session handle %d with ret %d",
485 ua_chan->name, app->key.pid, ua_sess->handle, ret);
486 goto error;
487 }
488
489 ua_chan->enabled = 1;
490
491 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
492 ua_chan->name, app->key.pid);
493
494 error:
495 return ret;
496 }
497
498 /*
499 * Enable the specified event on to UST tracer for the UST session.
500 */
501 static int enable_ust_event(struct ust_app *app,
502 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
503 {
504 int ret;
505
506 ret = ustctl_enable(app->key.sock, ua_event->obj);
507 if (ret < 0) {
508 ERR("UST app event %s enable failed for app (pid: %d) "
509 "and session handle %d with ret %d",
510 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
511 goto error;
512 }
513
514 DBG2("UST app event %s enabled successfully for app (pid: %d)",
515 ua_event->attr.name, app->key.pid);
516
517 error:
518 return ret;
519 }
520
521 /*
522 * Open metadata onto the UST tracer for a UST session.
523 */
524 static int open_ust_metadata(struct ust_app *app,
525 struct ust_app_session *ua_sess)
526 {
527 int ret;
528 struct lttng_ust_channel_attr uattr;
529
530 uattr.overwrite = ua_sess->metadata->attr.overwrite;
531 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
532 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
533 uattr.switch_timer_interval =
534 ua_sess->metadata->attr.switch_timer_interval;
535 uattr.read_timer_interval =
536 ua_sess->metadata->attr.read_timer_interval;
537 uattr.output = ua_sess->metadata->attr.output;
538
539 /* UST tracer metadata creation */
540 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
541 &ua_sess->metadata->obj);
542 if (ret < 0) {
543 ERR("UST app open metadata failed for app pid:%d with ret %d",
544 app->key.pid, ret);
545 goto error;
546 }
547
548 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
549
550 error:
551 return ret;
552 }
553
554 /*
555 * Create stream onto the UST tracer for a UST session.
556 */
557 static int create_ust_stream(struct ust_app *app,
558 struct ust_app_session *ua_sess)
559 {
560 int ret;
561
562 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
563 &ua_sess->metadata->stream_obj);
564 if (ret < 0) {
565 ERR("UST create metadata stream failed");
566 goto error;
567 }
568
569 error:
570 return ret;
571 }
572
573 /*
574 * Create the specified channel onto the UST tracer for a UST session.
575 */
576 static int create_ust_channel(struct ust_app *app,
577 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
578 {
579 int ret;
580
581 /* TODO: remove cast and use lttng-ust-abi.h */
582 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
583 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
584 if (ret < 0) {
585 ERR("Creating channel %s for app (pid: %d, sock: %d) "
586 "and session handle %d with ret %d",
587 ua_chan->name, app->key.pid, app->key.sock,
588 ua_sess->handle, ret);
589 goto error;
590 }
591
592 ua_chan->handle = ua_chan->obj->handle;
593
594 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
595 ua_chan->name, app->key.pid, app->key.sock);
596
597 /* If channel is not enabled, disable it on the tracer */
598 if (!ua_chan->enabled) {
599 ret = disable_ust_channel(app, ua_sess, ua_chan);
600 if (ret < 0) {
601 goto error;
602 }
603 }
604
605 error:
606 return ret;
607 }
608
609 /*
610 * Create the specified event onto the UST tracer for a UST session.
611 */
612 static
613 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
614 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
615 {
616 int ret = 0;
617
618 /* Create UST event on tracer */
619 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
620 &ua_event->obj);
621 if (ret < 0) {
622 if (ret == -EEXIST) {
623 ret = 0;
624 goto error;
625 }
626 ERR("Error ustctl create event %s for app pid: %d with ret %d",
627 ua_event->attr.name, app->key.pid, ret);
628 goto error;
629 }
630
631 ua_event->handle = ua_event->obj->handle;
632
633 DBG2("UST app event %s created successfully for pid:%d",
634 ua_event->attr.name, app->key.pid);
635
636 /* If event not enabled, disable it on the tracer */
637 if (ua_event->enabled == 0) {
638 ret = disable_ust_event(app, ua_sess, ua_event);
639 if (ret < 0) {
640 /*
641 * If we hit an EPERM, something is wrong with our disable call. If
642 * we get an EEXIST, there is a problem on the tracer side since we
643 * just created it.
644 */
645 switch (ret) {
646 case -EPERM:
647 /* Code flow problem */
648 assert(0);
649 case -EEXIST:
650 /* It's OK for our use case. */
651 ret = 0;
652 break;
653 default:
654 break;
655 }
656 goto error;
657 }
658 }
659
660 error:
661 return ret;
662 }
663
664 /*
665 * Copy data between an UST app event and a LTT event.
666 */
667 static void shadow_copy_event(struct ust_app_event *ua_event,
668 struct ltt_ust_event *uevent)
669 {
670 struct lttng_ht_iter iter;
671 struct ltt_ust_context *uctx;
672 struct ust_app_ctx *ua_ctx;
673
674 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
675 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
676
677 ua_event->enabled = uevent->enabled;
678
679 /* Copy event attributes */
680 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
681
682 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
683 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
684 if (ua_ctx == NULL) {
685 /* malloc() failed. We should simply stop */
686 return;
687 }
688
689 lttng_ht_node_init_ulong(&ua_ctx->node,
690 (unsigned long) ua_ctx->ctx.ctx);
691 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
692 }
693 }
694
695 /*
696 * Copy data between an UST app channel and a LTT channel.
697 */
698 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
699 struct ltt_ust_channel *uchan)
700 {
701 struct lttng_ht_iter iter;
702 struct lttng_ht_node_str *ua_event_node;
703 struct ltt_ust_event *uevent;
704 struct ltt_ust_context *uctx;
705 struct ust_app_event *ua_event;
706 struct ust_app_ctx *ua_ctx;
707
708 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
709
710 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
711 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
712 /* Copy event attributes */
713 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
714
715 ua_chan->enabled = uchan->enabled;
716
717 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
718 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
719 if (ua_ctx == NULL) {
720 continue;
721 }
722 lttng_ht_node_init_ulong(&ua_ctx->node,
723 (unsigned long) ua_ctx->ctx.ctx);
724 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
725 }
726
727 /* Copy all events from ltt ust channel to ust app channel */
728 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
729 struct lttng_ht_iter uiter;
730
731 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
732 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
733 if (ua_event_node == NULL) {
734 DBG2("UST event %s not found on shadow copy channel",
735 uevent->attr.name);
736 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
737 if (ua_event == NULL) {
738 continue;
739 }
740 shadow_copy_event(ua_event, uevent);
741 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
742 }
743 }
744
745 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
746 }
747
748 /*
749 * Copy data between a UST app session and a regular LTT session.
750 */
751 static void shadow_copy_session(struct ust_app_session *ua_sess,
752 struct ltt_ust_session *usess, struct ust_app *app)
753 {
754 struct lttng_ht_node_str *ua_chan_node;
755 struct lttng_ht_iter iter;
756 struct ltt_ust_channel *uchan;
757 struct ust_app_channel *ua_chan;
758 time_t rawtime;
759 struct tm *timeinfo;
760 char datetime[16];
761 int ret;
762
763 /* Get date and time for unique app path */
764 time(&rawtime);
765 timeinfo = localtime(&rawtime);
766 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
767
768 DBG2("Shadow copy of session handle %d", ua_sess->handle);
769
770 ua_sess->id = usess->id;
771 ua_sess->uid = usess->uid;
772 ua_sess->gid = usess->gid;
773
774 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
775 app->name, app->key.pid, datetime);
776 if (ret < 0) {
777 PERROR("asprintf UST shadow copy session");
778 /* TODO: We cannot return an error from here.. */
779 assert(0);
780 }
781
782 /* TODO: support all UST domain */
783
784 /* Iterate over all channels in global domain. */
785 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
786 uchan, node.node) {
787 struct lttng_ht_iter uiter;
788
789 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
790 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
791 if (ua_chan_node != NULL) {
792 /* Session exist. Contiuing. */
793 continue;
794 }
795
796 DBG2("Channel %s not found on shadow session copy, creating it",
797 uchan->name);
798 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
799 if (ua_chan == NULL) {
800 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
801 continue;
802 }
803
804 shadow_copy_channel(ua_chan, uchan);
805 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
806 }
807 }
808
809 /*
810 * Lookup sesison wrapper.
811 */
812 static
813 void __lookup_session_by_app(struct ltt_ust_session *usess,
814 struct ust_app *app, struct lttng_ht_iter *iter)
815 {
816 /* Get right UST app session from app */
817 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
818 }
819
820 /*
821 * Return ust app session from the app session hashtable using the UST session
822 * id.
823 */
824 static struct ust_app_session *lookup_session_by_app(
825 struct ltt_ust_session *usess, struct ust_app *app)
826 {
827 struct lttng_ht_iter iter;
828 struct lttng_ht_node_ulong *node;
829
830 __lookup_session_by_app(usess, app, &iter);
831 node = lttng_ht_iter_get_node_ulong(&iter);
832 if (node == NULL) {
833 goto error;
834 }
835
836 return caa_container_of(node, struct ust_app_session, node);
837
838 error:
839 return NULL;
840 }
841
842 /*
843 * Create a UST session onto the tracer of app and add it the session
844 * hashtable.
845 *
846 * Return ust app session or NULL on error.
847 */
848 static struct ust_app_session *create_ust_app_session(
849 struct ltt_ust_session *usess, struct ust_app *app)
850 {
851 int ret;
852 struct ust_app_session *ua_sess;
853
854 ua_sess = lookup_session_by_app(usess, app);
855 if (ua_sess == NULL) {
856 DBG2("UST app pid: %d session id %d not found, creating it",
857 app->key.pid, usess->id);
858 ua_sess = alloc_ust_app_session();
859 if (ua_sess == NULL) {
860 /* Only malloc can failed so something is really wrong */
861 goto end;
862 }
863 shadow_copy_session(ua_sess, usess, app);
864 }
865
866 if (ua_sess->handle == -1) {
867 ret = ustctl_create_session(app->key.sock);
868 if (ret < 0) {
869 ERR("Creating session for app pid %d", app->key.pid);
870 /* This means that the tracer is gone... */
871 ua_sess = (void*) -1UL;
872 goto error;
873 }
874
875 ua_sess->handle = ret;
876
877 /* Add ust app session to app's HT */
878 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
879 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
880
881 DBG2("UST app session created successfully with handle %d", ret);
882 }
883
884 end:
885 return ua_sess;
886
887 error:
888 delete_ust_app_session(-1, ua_sess);
889 return NULL;
890 }
891
892 /*
893 * Create a context for the channel on the tracer.
894 */
895 static
896 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
897 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
898 struct ust_app *app)
899 {
900 int ret = 0;
901 struct lttng_ht_iter iter;
902 struct lttng_ht_node_ulong *node;
903 struct ust_app_ctx *ua_ctx;
904
905 DBG2("UST app adding context to channel %s", ua_chan->name);
906
907 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
908 node = lttng_ht_iter_get_node_ulong(&iter);
909 if (node != NULL) {
910 ret = -EEXIST;
911 goto error;
912 }
913
914 ua_ctx = alloc_ust_app_ctx(uctx);
915 if (ua_ctx == NULL) {
916 /* malloc failed */
917 ret = -1;
918 goto error;
919 }
920
921 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
922 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
923
924 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
925 if (ret < 0) {
926 goto error;
927 }
928
929 error:
930 return ret;
931 }
932
933 /*
934 * Create an UST context and enable it for the event on the tracer.
935 */
936 static
937 int create_ust_app_event_context(struct ust_app_session *ua_sess,
938 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
939 struct ust_app *app)
940 {
941 int ret = 0;
942 struct lttng_ht_iter iter;
943 struct lttng_ht_node_ulong *node;
944 struct ust_app_ctx *ua_ctx;
945
946 DBG2("UST app adding context to event %s", ua_event->name);
947
948 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
949 node = lttng_ht_iter_get_node_ulong(&iter);
950 if (node != NULL) {
951 ret = -EEXIST;
952 goto error;
953 }
954
955 ua_ctx = alloc_ust_app_ctx(uctx);
956 if (ua_ctx == NULL) {
957 /* malloc failed */
958 ret = -1;
959 goto error;
960 }
961
962 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
963 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
964
965 ret = create_ust_event_context(ua_event, ua_ctx, app);
966 if (ret < 0) {
967 goto error;
968 }
969
970 error:
971 return ret;
972 }
973
974 /*
975 * Enable on the tracer side a ust app event for the session and channel.
976 */
977 static
978 int enable_ust_app_event(struct ust_app_session *ua_sess,
979 struct ust_app_event *ua_event, struct ust_app *app)
980 {
981 int ret;
982
983 ret = enable_ust_event(app, ua_sess, ua_event);
984 if (ret < 0) {
985 goto error;
986 }
987
988 ua_event->enabled = 1;
989
990 error:
991 return ret;
992 }
993
994 /*
995 * Disable on the tracer side a ust app event for the session and channel.
996 */
997 static int disable_ust_app_event(struct ust_app_session *ua_sess,
998 struct ust_app_event *ua_event, struct ust_app *app)
999 {
1000 int ret;
1001
1002 ret = disable_ust_event(app, ua_sess, ua_event);
1003 if (ret < 0) {
1004 goto error;
1005 }
1006
1007 ua_event->enabled = 0;
1008
1009 error:
1010 return ret;
1011 }
1012
1013 /*
1014 * Lookup ust app channel for session and disable it on the tracer side.
1015 */
1016 static
1017 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1018 struct ust_app_channel *ua_chan, struct ust_app *app)
1019 {
1020 int ret;
1021
1022 ret = disable_ust_channel(app, ua_sess, ua_chan);
1023 if (ret < 0) {
1024 goto error;
1025 }
1026
1027 ua_chan->enabled = 0;
1028
1029 error:
1030 return ret;
1031 }
1032
1033 /*
1034 * Lookup ust app channel for session and enable it on the tracer side.
1035 */
1036 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1037 struct ltt_ust_channel *uchan, struct ust_app *app)
1038 {
1039 int ret = 0;
1040 struct lttng_ht_iter iter;
1041 struct lttng_ht_node_str *ua_chan_node;
1042 struct ust_app_channel *ua_chan;
1043
1044 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1045 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1046 if (ua_chan_node == NULL) {
1047 DBG2("Unable to find channel %s in ust session id %u",
1048 uchan->name, ua_sess->id);
1049 goto error;
1050 }
1051
1052 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1053
1054 ret = enable_ust_channel(app, ua_sess, ua_chan);
1055 if (ret < 0) {
1056 goto error;
1057 }
1058
1059 error:
1060 return ret;
1061 }
1062
1063 /*
1064 * Create UST app channel and create it on the tracer.
1065 */
1066 static struct ust_app_channel *create_ust_app_channel(
1067 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1068 struct ust_app *app)
1069 {
1070 int ret = 0;
1071 struct lttng_ht_iter iter;
1072 struct lttng_ht_node_str *ua_chan_node;
1073 struct ust_app_channel *ua_chan;
1074
1075 /* Lookup channel in the ust app session */
1076 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1077 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1078 if (ua_chan_node != NULL) {
1079 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1080 goto end;
1081 }
1082
1083 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1084 if (ua_chan == NULL) {
1085 /* Only malloc can fail here */
1086 goto error;
1087 }
1088 shadow_copy_channel(ua_chan, uchan);
1089
1090 ret = create_ust_channel(app, ua_sess, ua_chan);
1091 if (ret < 0) {
1092 /* Not found previously means that it does not exist on the tracer */
1093 assert(ret != -EEXIST);
1094 goto error;
1095 }
1096
1097 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1098
1099 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1100 app->key.pid);
1101
1102 end:
1103 return ua_chan;
1104
1105 error:
1106 delete_ust_app_channel(-1, ua_chan);
1107 return NULL;
1108 }
1109
1110 /*
1111 * Create UST app event and create it on the tracer side.
1112 */
1113 static
1114 int create_ust_app_event(struct ust_app_session *ua_sess,
1115 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1116 struct ust_app *app)
1117 {
1118 int ret = 0;
1119 struct lttng_ht_iter iter;
1120 struct lttng_ht_node_str *ua_event_node;
1121 struct ust_app_event *ua_event;
1122
1123 /* Get event node */
1124 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1125 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1126 if (ua_event_node != NULL) {
1127 ret = -EEXIST;
1128 goto end;
1129 }
1130
1131 /* Does not exist so create one */
1132 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1133 if (ua_event == NULL) {
1134 /* Only malloc can failed so something is really wrong */
1135 ret = -ENOMEM;
1136 goto end;
1137 }
1138 shadow_copy_event(ua_event, uevent);
1139
1140 /* Create it on the tracer side */
1141 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1142 if (ret < 0) {
1143 /* Not found previously means that it does not exist on the tracer */
1144 assert(ret != -EEXIST);
1145 goto error;
1146 }
1147
1148 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1149
1150 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1151 app->key.pid);
1152
1153 end:
1154 return ret;
1155
1156 error:
1157 /* Valid. Calling here is already in a read side lock */
1158 delete_ust_app_event(-1, ua_event);
1159 return ret;
1160 }
1161
1162 /*
1163 * Create UST metadata and open it on the tracer side.
1164 */
1165 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1166 char *pathname, struct ust_app *app)
1167 {
1168 int ret = 0;
1169
1170 if (ua_sess->metadata == NULL) {
1171 /* Allocate UST metadata */
1172 ua_sess->metadata = trace_ust_create_metadata(pathname);
1173 if (ua_sess->metadata == NULL) {
1174 /* malloc() failed */
1175 goto error;
1176 }
1177
1178 ret = open_ust_metadata(app, ua_sess);
1179 if (ret < 0) {
1180 DBG3("Opening metadata failed. Cleaning up memory");
1181
1182 /* Cleanup failed metadata struct */
1183 free(ua_sess->metadata);
1184 /*
1185 * This is very important because delete_ust_app_session check if
1186 * the pointer is null or not in order to delete the metadata.
1187 */
1188 ua_sess->metadata = NULL;
1189 goto error;
1190 }
1191
1192 DBG2("UST metadata opened for app pid %d", app->key.pid);
1193 }
1194
1195 /* Open UST metadata stream */
1196 if (ua_sess->metadata->stream_obj == NULL) {
1197 ret = create_ust_stream(app, ua_sess);
1198 if (ret < 0) {
1199 goto error;
1200 }
1201
1202 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
1203 ua_sess->uid, ua_sess->gid);
1204 if (ret < 0) {
1205 PERROR("mkdir UST metadata");
1206 goto error;
1207 }
1208
1209 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1210 "%s/metadata", ua_sess->path);
1211 if (ret < 0) {
1212 PERROR("asprintf UST create stream");
1213 goto error;
1214 }
1215
1216 DBG2("UST metadata stream object created for app pid %d",
1217 app->key.pid);
1218 } else {
1219 ERR("Attempting to create stream without metadata opened");
1220 goto error;
1221 }
1222
1223 return 0;
1224
1225 error:
1226 return -1;
1227 }
1228
1229 /*
1230 * Return pointer to traceable apps list.
1231 */
1232 struct lttng_ht *ust_app_get_ht(void)
1233 {
1234 return ust_app_ht;
1235 }
1236
1237 /*
1238 * Return ust app pointer or NULL if not found.
1239 */
1240 struct ust_app *ust_app_find_by_pid(pid_t pid)
1241 {
1242 struct lttng_ht_node_ulong *node;
1243 struct lttng_ht_iter iter;
1244
1245 rcu_read_lock();
1246 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1247 node = lttng_ht_iter_get_node_ulong(&iter);
1248 if (node == NULL) {
1249 DBG2("UST app no found with pid %d", pid);
1250 goto error;
1251 }
1252 rcu_read_unlock();
1253
1254 DBG2("Found UST app by pid %d", pid);
1255
1256 return caa_container_of(node, struct ust_app, node);
1257
1258 error:
1259 rcu_read_unlock();
1260 return NULL;
1261 }
1262
1263 /*
1264 * Using pid and uid (of the app), allocate a new ust_app struct and
1265 * add it to the global traceable app list.
1266 *
1267 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1268 * bitness is not supported.
1269 */
1270 int ust_app_register(struct ust_register_msg *msg, int sock)
1271 {
1272 struct ust_app *lta;
1273 int ret;
1274
1275 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1276 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1277 ERR("Registration failed: application \"%s\" (pid: %d) has "
1278 "%d-bit long, but no consumerd for this long size is available.\n",
1279 msg->name, msg->pid, msg->bits_per_long);
1280 ret = close(sock);
1281 if (ret) {
1282 PERROR("close");
1283 }
1284 return -EINVAL;
1285 }
1286 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1287 ERR("Registration failed: application \"%s\" (pid: %d) has "
1288 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1289 msg->name, msg->pid, msg->major, msg->minor);
1290 ret = close(sock);
1291 if (ret) {
1292 PERROR("close");
1293 }
1294 return -EINVAL;
1295 }
1296 lta = zmalloc(sizeof(struct ust_app));
1297 if (lta == NULL) {
1298 PERROR("malloc");
1299 return -ENOMEM;
1300 }
1301
1302 lta->ppid = msg->ppid;
1303 lta->uid = msg->uid;
1304 lta->gid = msg->gid;
1305 lta->compatible = 0; /* Not compatible until proven */
1306 lta->bits_per_long = msg->bits_per_long;
1307 lta->v_major = msg->major;
1308 lta->v_minor = msg->minor;
1309 strncpy(lta->name, msg->name, sizeof(lta->name));
1310 lta->name[16] = '\0';
1311 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1312
1313 /* Set key map */
1314 lta->key.pid = msg->pid;
1315 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
1316 lta->key.sock = sock;
1317 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
1318
1319 rcu_read_lock();
1320 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1321 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
1322 rcu_read_unlock();
1323
1324 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1325 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1326 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1327
1328 return 0;
1329 }
1330
1331 /*
1332 * Unregister app by removing it from the global traceable app list and freeing
1333 * the data struct.
1334 *
1335 * The socket is already closed at this point so no close to sock.
1336 */
1337 void ust_app_unregister(int sock)
1338 {
1339 struct ust_app *lta;
1340 struct lttng_ht_node_ulong *node;
1341 struct lttng_ht_iter iter;
1342 int ret;
1343
1344 rcu_read_lock();
1345 lta = find_app_by_sock(sock);
1346 if (lta == NULL) {
1347 ERR("Unregister app sock %d not found!", sock);
1348 goto error;
1349 }
1350
1351 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1352
1353 /* Remove application from socket hash table */
1354 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1355 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1356 assert(!ret);
1357
1358 /* Get the node reference for a call_rcu */
1359 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1360 node = lttng_ht_iter_get_node_ulong(&iter);
1361 if (node == NULL) {
1362 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1363 goto error;
1364 }
1365
1366 /* Remove application from PID hash table */
1367 ret = lttng_ht_del(ust_app_ht, &iter);
1368 assert(!ret);
1369 call_rcu(&node->head, delete_ust_app_rcu);
1370 error:
1371 rcu_read_unlock();
1372 return;
1373 }
1374
1375 /*
1376 * Return traceable_app_count
1377 */
1378 unsigned long ust_app_list_count(void)
1379 {
1380 unsigned long count;
1381
1382 rcu_read_lock();
1383 count = lttng_ht_get_count(ust_app_ht);
1384 rcu_read_unlock();
1385
1386 return count;
1387 }
1388
1389 /*
1390 * Fill events array with all events name of all registered apps.
1391 */
1392 int ust_app_list_events(struct lttng_event **events)
1393 {
1394 int ret, handle;
1395 size_t nbmem, count = 0;
1396 struct lttng_ht_iter iter;
1397 struct ust_app *app;
1398 struct lttng_event *tmp;
1399
1400 nbmem = UST_APP_EVENT_LIST_SIZE;
1401 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1402 if (tmp == NULL) {
1403 PERROR("zmalloc ust app events");
1404 ret = -ENOMEM;
1405 goto error;
1406 }
1407
1408 rcu_read_lock();
1409
1410 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1411 struct lttng_ust_tracepoint_iter uiter;
1412
1413 if (!app->compatible) {
1414 /*
1415 * TODO: In time, we should notice the caller of this error by
1416 * telling him that this is a version error.
1417 */
1418 continue;
1419 }
1420 handle = ustctl_tracepoint_list(app->key.sock);
1421 if (handle < 0) {
1422 ERR("UST app list events getting handle failed for app pid %d",
1423 app->key.pid);
1424 continue;
1425 }
1426
1427 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1428 &uiter)) != -ENOENT) {
1429 if (count >= nbmem) {
1430 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1431 2 * nbmem);
1432 nbmem *= 2;
1433 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1434 if (tmp == NULL) {
1435 PERROR("realloc ust app events");
1436 ret = -ENOMEM;
1437 goto rcu_error;
1438 }
1439 }
1440 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1441 tmp[count].loglevel = uiter.loglevel;
1442 tmp[count].type = LTTNG_UST_TRACEPOINT;
1443 tmp[count].pid = app->key.pid;
1444 tmp[count].enabled = -1;
1445 count++;
1446 }
1447 }
1448
1449 ret = count;
1450 *events = tmp;
1451
1452 DBG2("UST app list events done (%zu events)", count);
1453
1454 rcu_error:
1455 rcu_read_unlock();
1456 error:
1457 return ret;
1458 }
1459
1460 /*
1461 * Free and clean all traceable apps of the global list.
1462 */
1463 void ust_app_clean_list(void)
1464 {
1465 int ret;
1466 struct lttng_ht_iter iter;
1467 struct lttng_ht_node_ulong *node;
1468
1469 DBG2("UST app cleaning registered apps hash table");
1470
1471 rcu_read_lock();
1472
1473 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1474 ret = lttng_ht_del(ust_app_ht, &iter);
1475 assert(!ret);
1476 call_rcu(&node->head, delete_ust_app_rcu);
1477 }
1478 /* Destroy is done only when the ht is empty */
1479 lttng_ht_destroy(ust_app_ht);
1480
1481 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1482 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1483 assert(!ret);
1484 }
1485 /* Destroy is done only when the ht is empty */
1486 lttng_ht_destroy(ust_app_sock_key_map);
1487
1488 rcu_read_unlock();
1489 }
1490
1491 /*
1492 * Init UST app hash table.
1493 */
1494 void ust_app_ht_alloc(void)
1495 {
1496 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1497 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1498 }
1499
1500 /*
1501 * For a specific UST session, disable the channel for all registered apps.
1502 */
1503 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1504 struct ltt_ust_channel *uchan)
1505 {
1506 int ret = 0;
1507 struct lttng_ht_iter iter;
1508 struct lttng_ht_node_str *ua_chan_node;
1509 struct ust_app *app;
1510 struct ust_app_session *ua_sess;
1511 struct ust_app_channel *ua_chan;
1512
1513 if (usess == NULL || uchan == NULL) {
1514 ERR("Disabling UST global channel with NULL values");
1515 ret = -1;
1516 goto error;
1517 }
1518
1519 DBG2("UST app disabling channel %s from global domain for session id %d",
1520 uchan->name, usess->id);
1521
1522 rcu_read_lock();
1523
1524 /* For every registered applications */
1525 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1526 struct lttng_ht_iter uiter;
1527 if (!app->compatible) {
1528 /*
1529 * TODO: In time, we should notice the caller of this error by
1530 * telling him that this is a version error.
1531 */
1532 continue;
1533 }
1534 ua_sess = lookup_session_by_app(usess, app);
1535 if (ua_sess == NULL) {
1536 continue;
1537 }
1538
1539 /* Get channel */
1540 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1541 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1542 /* If the session if found for the app, the channel must be there */
1543 assert(ua_chan_node);
1544
1545 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1546 /* The channel must not be already disabled */
1547 assert(ua_chan->enabled == 1);
1548
1549 /* Disable channel onto application */
1550 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1551 if (ret < 0) {
1552 /* XXX: We might want to report this error at some point... */
1553 continue;
1554 }
1555 }
1556
1557 rcu_read_unlock();
1558
1559 error:
1560 return ret;
1561 }
1562
1563 /*
1564 * For a specific UST session, enable the channel for all registered apps.
1565 */
1566 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1567 struct ltt_ust_channel *uchan)
1568 {
1569 int ret = 0;
1570 struct lttng_ht_iter iter;
1571 struct ust_app *app;
1572 struct ust_app_session *ua_sess;
1573
1574 if (usess == NULL || uchan == NULL) {
1575 ERR("Adding UST global channel to NULL values");
1576 ret = -1;
1577 goto error;
1578 }
1579
1580 DBG2("UST app enabling channel %s to global domain for session id %d",
1581 uchan->name, usess->id);
1582
1583 rcu_read_lock();
1584
1585 /* For every registered applications */
1586 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1587 if (!app->compatible) {
1588 /*
1589 * TODO: In time, we should notice the caller of this error by
1590 * telling him that this is a version error.
1591 */
1592 continue;
1593 }
1594 ua_sess = lookup_session_by_app(usess, app);
1595 if (ua_sess == NULL) {
1596 continue;
1597 }
1598
1599 /* Enable channel onto application */
1600 ret = enable_ust_app_channel(ua_sess, uchan, app);
1601 if (ret < 0) {
1602 /* XXX: We might want to report this error at some point... */
1603 continue;
1604 }
1605 }
1606
1607 rcu_read_unlock();
1608
1609 error:
1610 return ret;
1611 }
1612
1613 /*
1614 * Disable an event in a channel and for a specific session.
1615 */
1616 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1617 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1618 {
1619 int ret = 0;
1620 struct lttng_ht_iter iter, uiter;
1621 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1622 struct ust_app *app;
1623 struct ust_app_session *ua_sess;
1624 struct ust_app_channel *ua_chan;
1625 struct ust_app_event *ua_event;
1626
1627 DBG("UST app disabling event %s for all apps in channel "
1628 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1629
1630 rcu_read_lock();
1631
1632 /* For all registered applications */
1633 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1634 if (!app->compatible) {
1635 /*
1636 * TODO: In time, we should notice the caller of this error by
1637 * telling him that this is a version error.
1638 */
1639 continue;
1640 }
1641 ua_sess = lookup_session_by_app(usess, app);
1642 if (ua_sess == NULL) {
1643 /* Next app */
1644 continue;
1645 }
1646
1647 /* Lookup channel in the ust app session */
1648 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1649 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1650 if (ua_chan_node == NULL) {
1651 DBG2("Channel %s not found in session id %d for app pid %d."
1652 "Skipping", uchan->name, usess->id, app->key.pid);
1653 continue;
1654 }
1655 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1656
1657 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1658 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1659 if (ua_event_node == NULL) {
1660 DBG2("Event %s not found in channel %s for app pid %d."
1661 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1662 continue;
1663 }
1664 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1665
1666 ret = disable_ust_app_event(ua_sess, ua_event, app);
1667 if (ret < 0) {
1668 /* XXX: Report error someday... */
1669 continue;
1670 }
1671 }
1672
1673 rcu_read_unlock();
1674
1675 return ret;
1676 }
1677
1678 /*
1679 * For a specific UST session and UST channel, the event for all
1680 * registered apps.
1681 */
1682 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1683 struct ltt_ust_channel *uchan)
1684 {
1685 int ret = 0;
1686 struct lttng_ht_iter iter, uiter;
1687 struct lttng_ht_node_str *ua_chan_node;
1688 struct ust_app *app;
1689 struct ust_app_session *ua_sess;
1690 struct ust_app_channel *ua_chan;
1691 struct ust_app_event *ua_event;
1692
1693 DBG("UST app disabling all event for all apps in channel "
1694 "%s for session id %d", uchan->name, usess->id);
1695
1696 rcu_read_lock();
1697
1698 /* For all registered applications */
1699 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1700 if (!app->compatible) {
1701 /*
1702 * TODO: In time, we should notice the caller of this error by
1703 * telling him that this is a version error.
1704 */
1705 continue;
1706 }
1707 ua_sess = lookup_session_by_app(usess, app);
1708 /* If ua_sess is NULL, there is a code flow error */
1709 assert(ua_sess);
1710
1711 /* Lookup channel in the ust app session */
1712 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1713 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1714 /* If the channel is not found, there is a code flow error */
1715 assert(ua_chan_node);
1716
1717 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1718
1719 /* Disable each events of channel */
1720 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1721 node.node) {
1722 ret = disable_ust_app_event(ua_sess, ua_event, app);
1723 if (ret < 0) {
1724 /* XXX: Report error someday... */
1725 continue;
1726 }
1727 }
1728 }
1729
1730 rcu_read_unlock();
1731
1732 return ret;
1733 }
1734
1735 /*
1736 * For a specific UST session, create the channel for all registered apps.
1737 */
1738 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1739 struct ltt_ust_channel *uchan)
1740 {
1741 struct lttng_ht_iter iter;
1742 struct ust_app *app;
1743 struct ust_app_session *ua_sess;
1744 struct ust_app_channel *ua_chan;
1745
1746 /* Very wrong code flow */
1747 assert(usess);
1748 assert(uchan);
1749
1750 DBG2("UST app adding channel %s to global domain for session id %d",
1751 uchan->name, usess->id);
1752
1753 rcu_read_lock();
1754
1755 /* For every registered applications */
1756 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1757 if (!app->compatible) {
1758 /*
1759 * TODO: In time, we should notice the caller of this error by
1760 * telling him that this is a version error.
1761 */
1762 continue;
1763 }
1764 /*
1765 * Create session on the tracer side and add it to app session HT. Note
1766 * that if session exist, it will simply return a pointer to the ust
1767 * app session.
1768 */
1769 ua_sess = create_ust_app_session(usess, app);
1770 if (ua_sess == NULL) {
1771 /* The malloc() failed. */
1772 goto error;
1773 } else if (ua_sess == (void *) -1UL) {
1774 /* The application's socket is not valid. Contiuing */
1775 continue;
1776 }
1777
1778 /* Create channel onto application */
1779 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1780 if (ua_chan == NULL) {
1781 /* Major problem here and it's maybe the tracer or malloc() */
1782 goto error;
1783 }
1784 }
1785
1786 rcu_read_unlock();
1787
1788 return 0;
1789
1790 error:
1791 return -1;
1792 }
1793
1794 /*
1795 * Enable event for a specific session and channel on the tracer.
1796 */
1797 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1798 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1799 {
1800 int ret = 0;
1801 struct lttng_ht_iter iter, uiter;
1802 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1803 struct ust_app *app;
1804 struct ust_app_session *ua_sess;
1805 struct ust_app_channel *ua_chan;
1806 struct ust_app_event *ua_event;
1807
1808 DBG("UST app enabling event %s for all apps for session id %d",
1809 uevent->attr.name, usess->id);
1810
1811 /*
1812 * NOTE: At this point, this function is called only if the session and
1813 * channel passed are already created for all apps. and enabled on the
1814 * tracer also.
1815 */
1816
1817 rcu_read_lock();
1818
1819 /* For all registered applications */
1820 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1821 if (!app->compatible) {
1822 /*
1823 * TODO: In time, we should notice the caller of this error by
1824 * telling him that this is a version error.
1825 */
1826 continue;
1827 }
1828 ua_sess = lookup_session_by_app(usess, app);
1829 /* If ua_sess is NULL, there is a code flow error */
1830 assert(ua_sess);
1831
1832 /* Lookup channel in the ust app session */
1833 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1834 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1835 /* If the channel is not found, there is a code flow error */
1836 assert(ua_chan_node);
1837
1838 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1839
1840 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1841 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1842 if (ua_event_node == NULL) {
1843 DBG3("UST app enable event %s not found for app PID %d."
1844 "Skipping app", uevent->attr.name, app->key.pid);
1845 continue;
1846 }
1847 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1848
1849 ret = enable_ust_app_event(ua_sess, ua_event, app);
1850 if (ret < 0) {
1851 goto error;
1852 }
1853 }
1854
1855 error:
1856 rcu_read_unlock();
1857 return ret;
1858 }
1859
1860 /*
1861 * For a specific existing UST session and UST channel, creates the event for
1862 * all registered apps.
1863 */
1864 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1865 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1866 {
1867 int ret = 0;
1868 struct lttng_ht_iter iter, uiter;
1869 struct lttng_ht_node_str *ua_chan_node;
1870 struct ust_app *app;
1871 struct ust_app_session *ua_sess;
1872 struct ust_app_channel *ua_chan;
1873
1874 DBG("UST app creating event %s for all apps for session id %d",
1875 uevent->attr.name, usess->id);
1876
1877 rcu_read_lock();
1878
1879 /* For all registered applications */
1880 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1881 if (!app->compatible) {
1882 /*
1883 * TODO: In time, we should notice the caller of this error by
1884 * telling him that this is a version error.
1885 */
1886 continue;
1887 }
1888 ua_sess = lookup_session_by_app(usess, app);
1889 /* If ua_sess is NULL, there is a code flow error */
1890 assert(ua_sess);
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 the channel is not found, there is a code flow error */
1896 assert(ua_chan_node);
1897
1898 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1899
1900 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1901 if (ret < 0) {
1902 if (ret != -EEXIST) {
1903 /* Possible value at this point: -ENOMEM. If so, we stop! */
1904 break;
1905 }
1906 DBG2("UST app event %s already exist on app PID %d",
1907 uevent->attr.name, app->key.pid);
1908 continue;
1909 }
1910 }
1911
1912 rcu_read_unlock();
1913
1914 return ret;
1915 }
1916
1917 /*
1918 * Start tracing for a specific UST session and app.
1919 */
1920 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1921 {
1922 int ret = 0;
1923 struct lttng_ht_iter iter;
1924 struct ust_app_session *ua_sess;
1925 struct ust_app_channel *ua_chan;
1926 struct ltt_ust_stream *ustream;
1927 int consumerd_fd;
1928
1929 DBG("Starting tracing for ust app pid %d", app->key.pid);
1930
1931 rcu_read_lock();
1932
1933 if (!app->compatible) {
1934 goto end;
1935 }
1936
1937 ua_sess = lookup_session_by_app(usess, app);
1938 if (ua_sess == NULL) {
1939 goto error_rcu_unlock;
1940 }
1941
1942 /* Upon restart, we skip the setup, already done */
1943 if (ua_sess->started) {
1944 goto skip_setup;
1945 }
1946
1947 /* Indicate that the session has been started once */
1948 ua_sess->started = 1;
1949
1950 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1951 if (ret < 0) {
1952 goto error_rcu_unlock;
1953 }
1954
1955 /* For each channel */
1956 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1957 node.node) {
1958 /* Create all streams */
1959 while (1) {
1960 /* Create UST stream */
1961 ustream = zmalloc(sizeof(*ustream));
1962 if (ustream == NULL) {
1963 PERROR("zmalloc ust stream");
1964 goto error_rcu_unlock;
1965 }
1966
1967 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1968 &ustream->obj);
1969 if (ret < 0) {
1970 /* Got all streams */
1971 break;
1972 }
1973 ustream->handle = ustream->obj->handle;
1974
1975 /* Order is important */
1976 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1977 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1978 ua_sess->path, ua_chan->name,
1979 ua_chan->streams.count++);
1980 if (ret < 0) {
1981 PERROR("asprintf UST create stream");
1982 continue;
1983 }
1984 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1985 ustream->pathname);
1986 }
1987 }
1988
1989 switch (app->bits_per_long) {
1990 case 64:
1991 consumerd_fd = ust_consumerd64_fd;
1992 break;
1993 case 32:
1994 consumerd_fd = ust_consumerd32_fd;
1995 break;
1996 default:
1997 ret = -EINVAL;
1998 goto error_rcu_unlock;
1999 }
2000
2001 /* Setup UST consumer socket and send fds to it */
2002 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
2003 if (ret < 0) {
2004 goto error_rcu_unlock;
2005 }
2006
2007 skip_setup:
2008 /* This start the UST tracing */
2009 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
2010 if (ret < 0) {
2011 ERR("Error starting tracing for app pid: %d", app->key.pid);
2012 goto error_rcu_unlock;
2013 }
2014
2015 /* Quiescent wait after starting trace */
2016 ustctl_wait_quiescent(app->key.sock);
2017
2018 end:
2019 rcu_read_unlock();
2020 return 0;
2021
2022 error_rcu_unlock:
2023 rcu_read_unlock();
2024 return -1;
2025 }
2026
2027 /*
2028 * Stop tracing for a specific UST session and app.
2029 */
2030 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2031 {
2032 int ret = 0;
2033 struct lttng_ht_iter iter;
2034 struct ust_app_session *ua_sess;
2035 struct ust_app_channel *ua_chan;
2036
2037 DBG("Stopping tracing for ust app pid %d", app->key.pid);
2038
2039 rcu_read_lock();
2040
2041 if (!app->compatible) {
2042 goto end;
2043 }
2044
2045 ua_sess = lookup_session_by_app(usess, app);
2046 if (ua_sess == NULL) {
2047 /* Only malloc can failed so something is really wrong */
2048 goto error_rcu_unlock;
2049 }
2050
2051 /*
2052 * If started = 0, it means that stop trace has been called for a session
2053 * that was never started. This is a code flow error and should never
2054 * happen.
2055 */
2056 assert(ua_sess->started == 1);
2057
2058 /* This inhibits UST tracing */
2059 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
2060 if (ret < 0) {
2061 ERR("Error stopping tracing for app pid: %d", app->key.pid);
2062 goto error_rcu_unlock;
2063 }
2064
2065 /* Quiescent wait after stopping trace */
2066 ustctl_wait_quiescent(app->key.sock);
2067
2068 /* Flushing buffers */
2069 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2070 node.node) {
2071 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
2072 if (ret < 0) {
2073 ERR("UST app PID %d channel %s flush failed with ret %d",
2074 app->key.pid, ua_chan->name, ret);
2075 /* Continuing flushing all buffers */
2076 continue;
2077 }
2078 }
2079
2080 /* Flush all buffers before stopping */
2081 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
2082 if (ret < 0) {
2083 ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
2084 ret);
2085 }
2086
2087 end:
2088 rcu_read_unlock();
2089 return 0;
2090
2091 error_rcu_unlock:
2092 rcu_read_unlock();
2093 return -1;
2094 }
2095
2096 /*
2097 * Destroy a specific UST session in apps.
2098 */
2099 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2100 {
2101 struct ust_app_session *ua_sess;
2102 struct lttng_ust_object_data obj;
2103 struct lttng_ht_iter iter;
2104 struct lttng_ht_node_ulong *node;
2105 int ret;
2106
2107 DBG("Destroy tracing for ust app pid %d", app->key.pid);
2108
2109 rcu_read_lock();
2110
2111 if (!app->compatible) {
2112 goto end;
2113 }
2114
2115 __lookup_session_by_app(usess, app, &iter);
2116 node = lttng_ht_iter_get_node_ulong(&iter);
2117 if (node == NULL) {
2118 /* Only malloc can failed so something is really wrong */
2119 goto error_rcu_unlock;
2120 }
2121 ua_sess = caa_container_of(node, struct ust_app_session, node);
2122 ret = lttng_ht_del(app->sessions, &iter);
2123 assert(!ret);
2124 obj.handle = ua_sess->handle;
2125 obj.shm_fd = -1;
2126 obj.wait_fd = -1;
2127 obj.memory_map_size = 0;
2128 ustctl_release_object(app->key.sock, &obj);
2129
2130 delete_ust_app_session(app->key.sock, ua_sess);
2131
2132 /* Quiescent wait after stopping trace */
2133 ustctl_wait_quiescent(app->key.sock);
2134
2135 end:
2136 rcu_read_unlock();
2137 return 0;
2138
2139 error_rcu_unlock:
2140 rcu_read_unlock();
2141 return -1;
2142 }
2143
2144 /*
2145 * Start tracing for the UST session.
2146 */
2147 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2148 {
2149 int ret = 0;
2150 struct lttng_ht_iter iter;
2151 struct ust_app *app;
2152
2153 DBG("Starting all UST traces");
2154
2155 rcu_read_lock();
2156
2157 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2158 ret = ust_app_start_trace(usess, app);
2159 if (ret < 0) {
2160 /* Continue to next apps even on error */
2161 continue;
2162 }
2163 }
2164
2165 rcu_read_unlock();
2166
2167 return 0;
2168 }
2169
2170 /*
2171 * Start tracing for the UST session.
2172 */
2173 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2174 {
2175 int ret = 0;
2176 struct lttng_ht_iter iter;
2177 struct ust_app *app;
2178
2179 DBG("Stopping all UST traces");
2180
2181 rcu_read_lock();
2182
2183 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2184 ret = ust_app_stop_trace(usess, app);
2185 if (ret < 0) {
2186 /* Continue to next apps even on error */
2187 continue;
2188 }
2189 }
2190
2191 rcu_read_unlock();
2192
2193 return 0;
2194 }
2195
2196 /*
2197 * Destroy app UST session.
2198 */
2199 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2200 {
2201 int ret = 0;
2202 struct lttng_ht_iter iter;
2203 struct ust_app *app;
2204
2205 DBG("Destroy all UST traces");
2206
2207 rcu_read_lock();
2208
2209 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2210 ret = ust_app_destroy_trace(usess, app);
2211 if (ret < 0) {
2212 /* Continue to next apps even on error */
2213 continue;
2214 }
2215 }
2216
2217 rcu_read_unlock();
2218
2219 return 0;
2220 }
2221
2222 /*
2223 * Add channels/events from UST global domain to registered apps at sock.
2224 */
2225 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2226 {
2227 int ret = 0;
2228 struct lttng_ht_iter iter, uiter, iter_ctx;
2229 struct ust_app *app;
2230 struct ust_app_session *ua_sess;
2231 struct ust_app_channel *ua_chan;
2232 struct ust_app_event *ua_event;
2233 struct ust_app_ctx *ua_ctx;
2234
2235 if (usess == NULL) {
2236 ERR("No UST session on global update. Returning");
2237 goto error;
2238 }
2239
2240 DBG2("UST app global update for app sock %d for session id %d", sock,
2241 usess->id);
2242
2243 rcu_read_lock();
2244
2245 app = find_app_by_sock(sock);
2246 if (app == NULL) {
2247 ERR("Failed to update app sock %d", sock);
2248 goto error;
2249 }
2250
2251 if (!app->compatible) {
2252 goto error;
2253 }
2254
2255 ua_sess = create_ust_app_session(usess, app);
2256 if (ua_sess == NULL) {
2257 goto error;
2258 }
2259
2260 /*
2261 * We can iterate safely here over all UST app session sicne the create ust
2262 * app session above made a shadow copy of the UST global domain from the
2263 * ltt ust session.
2264 */
2265 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2266 node.node) {
2267 ret = create_ust_channel(app, ua_sess, ua_chan);
2268 if (ret < 0) {
2269 /* FIXME: Should we quit here or continue... */
2270 continue;
2271 }
2272
2273 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2274 node.node) {
2275 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2276 if (ret < 0) {
2277 /* FIXME: Should we quit here or continue... */
2278 continue;
2279 }
2280 }
2281
2282
2283 /* For each events */
2284 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2285 node.node) {
2286 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2287 if (ret < 0) {
2288 /* FIXME: Should we quit here or continue... */
2289 continue;
2290 }
2291
2292 /* Add context on events. */
2293 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2294 ua_ctx, node.node) {
2295 ret = create_ust_event_context(ua_event, ua_ctx, app);
2296 if (ret < 0) {
2297 /* FIXME: Should we quit here or continue... */
2298 continue;
2299 }
2300 }
2301 }
2302 }
2303
2304 if (usess->start_trace) {
2305 ret = ust_app_start_trace(usess, app);
2306 if (ret < 0) {
2307 goto error;
2308 }
2309
2310 DBG2("UST trace started for app pid %d", app->key.pid);
2311 }
2312
2313 error:
2314 rcu_read_unlock();
2315 return;
2316 }
2317
2318 /*
2319 * Add context to a specific channel for global UST domain.
2320 */
2321 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2322 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2323 {
2324 int ret = 0;
2325 struct lttng_ht_node_str *ua_chan_node;
2326 struct lttng_ht_iter iter, uiter;
2327 struct ust_app_channel *ua_chan = NULL;
2328 struct ust_app_session *ua_sess;
2329 struct ust_app *app;
2330
2331 rcu_read_lock();
2332
2333 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2334 if (!app->compatible) {
2335 /*
2336 * TODO: In time, we should notice the caller of this error by
2337 * telling him that this is a version error.
2338 */
2339 continue;
2340 }
2341 ua_sess = lookup_session_by_app(usess, app);
2342 if (ua_sess == NULL) {
2343 continue;
2344 }
2345
2346 /* Lookup channel in the ust app session */
2347 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2348 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2349 if (ua_chan_node == NULL) {
2350 continue;
2351 }
2352 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2353 node);
2354
2355 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2356 if (ret < 0) {
2357 continue;
2358 }
2359 }
2360
2361 rcu_read_unlock();
2362 return ret;
2363 }
2364
2365 /*
2366 * Add context to a specific event in a channel for global UST domain.
2367 */
2368 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2369 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2370 struct ltt_ust_context *uctx)
2371 {
2372 int ret = 0;
2373 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2374 struct lttng_ht_iter iter, uiter;
2375 struct ust_app_session *ua_sess;
2376 struct ust_app_event *ua_event;
2377 struct ust_app_channel *ua_chan = NULL;
2378 struct ust_app *app;
2379
2380 rcu_read_lock();
2381
2382 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2383 if (!app->compatible) {
2384 /*
2385 * TODO: In time, we should notice the caller of this error by
2386 * telling him that this is a version error.
2387 */
2388 continue;
2389 }
2390 ua_sess = lookup_session_by_app(usess, app);
2391 if (ua_sess == NULL) {
2392 continue;
2393 }
2394
2395 /* Lookup channel in the ust app session */
2396 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2397 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2398 if (ua_chan_node == NULL) {
2399 continue;
2400 }
2401 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2402 node);
2403
2404 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2405 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2406 if (ua_event_node == NULL) {
2407 continue;
2408 }
2409 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2410 node);
2411
2412 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2413 if (ret < 0) {
2414 continue;
2415 }
2416 }
2417
2418 rcu_read_unlock();
2419 return ret;
2420 }
2421
2422 /*
2423 * Enable event for a channel from a UST session for a specific PID.
2424 */
2425 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2426 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2427 {
2428 int ret = 0;
2429 struct lttng_ht_iter iter;
2430 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2431 struct ust_app *app;
2432 struct ust_app_session *ua_sess;
2433 struct ust_app_channel *ua_chan;
2434 struct ust_app_event *ua_event;
2435
2436 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2437
2438 rcu_read_lock();
2439
2440 app = ust_app_find_by_pid(pid);
2441 if (app == NULL) {
2442 ERR("UST app enable event per PID %d not found", pid);
2443 ret = -1;
2444 goto error;
2445 }
2446
2447 if (!app->compatible) {
2448 ret = 0;
2449 goto error;
2450 }
2451
2452 ua_sess = lookup_session_by_app(usess, app);
2453 /* If ua_sess is NULL, there is a code flow error */
2454 assert(ua_sess);
2455
2456 /* Lookup channel in the ust app session */
2457 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2458 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2459 /* If the channel is not found, there is a code flow error */
2460 assert(ua_chan_node);
2461
2462 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2463
2464 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2465 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2466 if (ua_event_node == NULL) {
2467 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2468 if (ret < 0) {
2469 goto error;
2470 }
2471 } else {
2472 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2473
2474 ret = enable_ust_app_event(ua_sess, ua_event, app);
2475 if (ret < 0) {
2476 goto error;
2477 }
2478 }
2479
2480 error:
2481 rcu_read_unlock();
2482 return ret;
2483 }
2484
2485 /*
2486 * Disable event for a channel from a UST session for a specific PID.
2487 */
2488 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2489 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2490 {
2491 int ret = 0;
2492 struct lttng_ht_iter iter;
2493 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2494 struct ust_app *app;
2495 struct ust_app_session *ua_sess;
2496 struct ust_app_channel *ua_chan;
2497 struct ust_app_event *ua_event;
2498
2499 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2500
2501 rcu_read_lock();
2502
2503 app = ust_app_find_by_pid(pid);
2504 if (app == NULL) {
2505 ERR("UST app disable event per PID %d not found", pid);
2506 ret = -1;
2507 goto error;
2508 }
2509
2510 if (!app->compatible) {
2511 ret = 0;
2512 goto error;
2513 }
2514
2515 ua_sess = lookup_session_by_app(usess, app);
2516 /* If ua_sess is NULL, there is a code flow error */
2517 assert(ua_sess);
2518
2519 /* Lookup channel in the ust app session */
2520 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2521 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2522 if (ua_chan_node == NULL) {
2523 /* Channel does not exist, skip disabling */
2524 goto error;
2525 }
2526 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2527
2528 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2529 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2530 if (ua_event_node == NULL) {
2531 /* Event does not exist, skip disabling */
2532 goto error;
2533 }
2534 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2535
2536 ret = disable_ust_app_event(ua_sess, ua_event, app);
2537 if (ret < 0) {
2538 goto error;
2539 }
2540
2541 error:
2542 rcu_read_unlock();
2543 return ret;
2544 }
2545
2546 /*
2547 * Validate version of UST apps and set the compatible bit.
2548 */
2549 int ust_app_validate_version(int sock)
2550 {
2551 int ret;
2552 struct ust_app *app;
2553
2554 rcu_read_lock();
2555
2556 app = find_app_by_sock(sock);
2557 assert(app);
2558
2559 ret = ustctl_tracer_version(sock, &app->version);
2560 if (ret < 0) {
2561 goto error;
2562 }
2563
2564 /* Validate version */
2565 if (app->version.major > UST_APP_MAJOR_VERSION) {
2566 goto error;
2567 }
2568
2569 DBG2("UST app PID %d is compatible with major version %d "
2570 "(supporting <= %d)", app->key.pid, app->version.major,
2571 UST_APP_MAJOR_VERSION);
2572 app->compatible = 1;
2573 rcu_read_unlock();
2574 return 0;
2575
2576 error:
2577 DBG2("UST app PID %d is not compatible with major version %d "
2578 "(supporting <= %d)", app->key.pid, app->version.major,
2579 UST_APP_MAJOR_VERSION);
2580 app->compatible = 0;
2581 rcu_read_unlock();
2582 return -1;
2583 }
2584
2585 /*
2586 * Calibrate registered applications.
2587 */
2588 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2589 {
2590 int ret = 0;
2591 struct lttng_ht_iter iter;
2592 struct ust_app *app;
2593
2594 rcu_read_lock();
2595
2596 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2597 if (!app->compatible) {
2598 /*
2599 * TODO: In time, we should notice the caller of this error by
2600 * telling him that this is a version error.
2601 */
2602 continue;
2603 }
2604
2605 ret = ustctl_calibrate(app->key.sock, calibrate);
2606 if (ret < 0) {
2607 switch (ret) {
2608 case -ENOSYS:
2609 /* Means that it's not implemented on the tracer side. */
2610 ret = 0;
2611 break;
2612 default:
2613 /* TODO: Report error to user */
2614 DBG2("Calibrate app PID %d returned with error %d",
2615 app->key.pid, ret);
2616 break;
2617 }
2618 }
2619 }
2620
2621 DBG("UST app global domain calibration finished");
2622
2623 rcu_read_unlock();
2624
2625 return ret;
2626 }
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