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77888048794c39d2cdd329122eccb3af633da39f
[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
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 <urcu/compiler.h>
29
30 #include <common/common.h>
31
32 #include "ust-app.h"
33 #include "ust-consumer.h"
34 #include "ust-ctl.h"
35
36 /*
37 * Delete ust context safely. RCU read lock must be held before calling
38 * this function.
39 */
40 static
41 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
42 {
43 if (ua_ctx->obj) {
44 ustctl_release_object(sock, ua_ctx->obj);
45 free(ua_ctx->obj);
46 }
47 free(ua_ctx);
48 }
49
50 /*
51 * Delete ust app event safely. RCU read lock must be held before calling
52 * this function.
53 */
54 static
55 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
56 {
57 int ret;
58 struct lttng_ht_iter iter;
59 struct ust_app_ctx *ua_ctx;
60
61 /* Destroy each context of event */
62 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
63 node.node) {
64 ret = lttng_ht_del(ua_event->ctx, &iter);
65 assert(!ret);
66 delete_ust_app_ctx(sock, ua_ctx);
67 }
68 lttng_ht_destroy(ua_event->ctx);
69
70 if (ua_event->obj != NULL) {
71 ustctl_release_object(sock, ua_event->obj);
72 free(ua_event->obj);
73 }
74 free(ua_event);
75 }
76
77 /*
78 * Delete ust app stream safely. RCU read lock must be held before calling
79 * this function.
80 */
81 static
82 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
83 {
84 if (stream->obj) {
85 ustctl_release_object(sock, stream->obj);
86 free(stream->obj);
87 }
88 free(stream);
89 }
90
91 /*
92 * Delete ust app channel safely. RCU read lock must be held before calling
93 * this function.
94 */
95 static
96 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
97 {
98 int ret;
99 struct lttng_ht_iter iter;
100 struct ust_app_event *ua_event;
101 struct ust_app_ctx *ua_ctx;
102 struct ltt_ust_stream *stream, *stmp;
103
104 /* Wipe stream */
105 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
106 cds_list_del(&stream->list);
107 delete_ust_app_stream(sock, stream);
108 }
109
110 /* Wipe context */
111 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
112 ret = lttng_ht_del(ua_chan->ctx, &iter);
113 assert(!ret);
114 delete_ust_app_ctx(sock, ua_ctx);
115 }
116 lttng_ht_destroy(ua_chan->ctx);
117
118 /* Wipe events */
119 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
120 node.node) {
121 ret = lttng_ht_del(ua_chan->events, &iter);
122 assert(!ret);
123 delete_ust_app_event(sock, ua_event);
124 }
125 lttng_ht_destroy(ua_chan->events);
126
127 if (ua_chan->obj != NULL) {
128 ustctl_release_object(sock, ua_chan->obj);
129 free(ua_chan->obj);
130 }
131 free(ua_chan);
132 }
133
134 /*
135 * Delete ust app session safely. RCU read lock must be held before calling
136 * this function.
137 */
138 static
139 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
140 {
141 int ret;
142 struct lttng_ht_iter iter;
143 struct ust_app_channel *ua_chan;
144
145 if (ua_sess->metadata) {
146 if (ua_sess->metadata->stream_obj) {
147 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
148 free(ua_sess->metadata->stream_obj);
149 }
150 if (ua_sess->metadata->obj) {
151 ustctl_release_object(sock, ua_sess->metadata->obj);
152 free(ua_sess->metadata->obj);
153 }
154 }
155
156 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
157 node.node) {
158 ret = lttng_ht_del(ua_sess->channels, &iter);
159 assert(!ret);
160 delete_ust_app_channel(sock, ua_chan);
161 }
162 lttng_ht_destroy(ua_sess->channels);
163
164 if (ua_sess->handle != -1) {
165 ustctl_release_handle(sock, ua_sess->handle);
166 }
167 free(ua_sess);
168 }
169
170 /*
171 * Delete a traceable application structure from the global list. Never call
172 * this function outside of a call_rcu call.
173 */
174 static
175 void delete_ust_app(struct ust_app *app)
176 {
177 int ret, sock;
178 struct lttng_ht_iter iter;
179 struct ust_app_session *ua_sess;
180
181 rcu_read_lock();
182
183 /* Delete ust app sessions info */
184 sock = app->key.sock;
185 app->key.sock = -1;
186
187 /* Wipe sessions */
188 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
189 node.node) {
190 ret = lttng_ht_del(app->sessions, &iter);
191 assert(!ret);
192 delete_ust_app_session(app->key.sock, ua_sess);
193 }
194 lttng_ht_destroy(app->sessions);
195
196 /*
197 * Wait until we have removed the key from the sock hash table before
198 * closing this socket, otherwise an application could re-use the socket ID
199 * and race with the teardown, using the same hash table entry.
200 */
201 close(sock);
202
203 DBG2("UST app pid %d deleted", app->key.pid);
204 free(app);
205
206 rcu_read_unlock();
207 }
208
209 /*
210 * URCU intermediate call to delete an UST app.
211 */
212 static
213 void delete_ust_app_rcu(struct rcu_head *head)
214 {
215 struct lttng_ht_node_ulong *node =
216 caa_container_of(head, struct lttng_ht_node_ulong, head);
217 struct ust_app *app =
218 caa_container_of(node, struct ust_app, node);
219
220 DBG3("Call RCU deleting app PID %d", app->key.pid);
221 delete_ust_app(app);
222 }
223
224 /*
225 * Alloc new UST app session.
226 */
227 static
228 struct ust_app_session *alloc_ust_app_session(void)
229 {
230 struct ust_app_session *ua_sess;
231
232 /* Init most of the default value by allocating and zeroing */
233 ua_sess = zmalloc(sizeof(struct ust_app_session));
234 if (ua_sess == NULL) {
235 PERROR("malloc");
236 goto error;
237 }
238
239 ua_sess->handle = -1;
240 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
241
242 return ua_sess;
243
244 error:
245 return NULL;
246 }
247
248 /*
249 * Alloc new UST app channel.
250 */
251 static
252 struct ust_app_channel *alloc_ust_app_channel(char *name,
253 struct lttng_ust_channel *attr)
254 {
255 struct ust_app_channel *ua_chan;
256
257 /* Init most of the default value by allocating and zeroing */
258 ua_chan = zmalloc(sizeof(struct ust_app_channel));
259 if (ua_chan == NULL) {
260 PERROR("malloc");
261 goto error;
262 }
263
264 /* Setup channel name */
265 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
266 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
267
268 ua_chan->enabled = 1;
269 ua_chan->handle = -1;
270 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
271 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
272 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
273
274 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
275
276 /* Copy attributes */
277 if (attr) {
278 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
279 }
280
281 DBG3("UST app channel %s allocated", ua_chan->name);
282
283 return ua_chan;
284
285 error:
286 return NULL;
287 }
288
289 /*
290 * Alloc new UST app event.
291 */
292 static
293 struct ust_app_event *alloc_ust_app_event(char *name,
294 struct lttng_ust_event *attr)
295 {
296 struct ust_app_event *ua_event;
297
298 /* Init most of the default value by allocating and zeroing */
299 ua_event = zmalloc(sizeof(struct ust_app_event));
300 if (ua_event == NULL) {
301 PERROR("malloc");
302 goto error;
303 }
304
305 ua_event->enabled = 1;
306 strncpy(ua_event->name, name, sizeof(ua_event->name));
307 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
308 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
309 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
310
311 /* Copy attributes */
312 if (attr) {
313 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
314 }
315
316 DBG3("UST app event %s allocated", ua_event->name);
317
318 return ua_event;
319
320 error:
321 return NULL;
322 }
323
324 /*
325 * Alloc new UST app context.
326 */
327 static
328 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
329 {
330 struct ust_app_ctx *ua_ctx;
331
332 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
333 if (ua_ctx == NULL) {
334 goto error;
335 }
336
337 if (uctx) {
338 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
339 }
340
341 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
342
343 error:
344 return ua_ctx;
345 }
346
347 /*
348 * Find an ust_app using the sock and return it. RCU read side lock must be
349 * held before calling this helper function.
350 */
351 static
352 struct ust_app *find_app_by_sock(int sock)
353 {
354 struct lttng_ht_node_ulong *node;
355 struct ust_app_key *key;
356 struct lttng_ht_iter iter;
357
358 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock),
359 &iter);
360 node = lttng_ht_iter_get_node_ulong(&iter);
361 if (node == NULL) {
362 DBG2("UST app find by sock %d key not found", sock);
363 goto error;
364 }
365 key = caa_container_of(node, struct ust_app_key, node);
366
367 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) key->pid), &iter);
368 node = lttng_ht_iter_get_node_ulong(&iter);
369 if (node == NULL) {
370 DBG2("UST app find by sock %d not found", sock);
371 goto error;
372 }
373 return caa_container_of(node, struct ust_app, node);
374
375 error:
376 return NULL;
377 }
378
379 /*
380 * Create the channel context on the tracer.
381 */
382 static
383 int create_ust_channel_context(struct ust_app_channel *ua_chan,
384 struct ust_app_ctx *ua_ctx, struct ust_app *app)
385 {
386 int ret;
387
388 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
389 ua_chan->obj, &ua_ctx->obj);
390 if (ret < 0) {
391 goto error;
392 }
393
394 ua_ctx->handle = ua_ctx->obj->handle;
395
396 DBG2("UST app context created successfully for channel %s", ua_chan->name);
397
398 error:
399 return ret;
400 }
401
402 /*
403 * Create the event context on the tracer.
404 */
405 static
406 int create_ust_event_context(struct ust_app_event *ua_event,
407 struct ust_app_ctx *ua_ctx, struct ust_app *app)
408 {
409 int ret;
410
411 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
412 ua_event->obj, &ua_ctx->obj);
413 if (ret < 0) {
414 goto error;
415 }
416
417 ua_ctx->handle = ua_ctx->obj->handle;
418
419 DBG2("UST app context created successfully for event %s", ua_event->name);
420
421 error:
422 return ret;
423 }
424
425 /*
426 * Disable the specified event on to UST tracer for the UST session.
427 */
428 static int disable_ust_event(struct ust_app *app,
429 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
430 {
431 int ret;
432
433 ret = ustctl_disable(app->key.sock, ua_event->obj);
434 if (ret < 0) {
435 ERR("UST app event %s disable failed for app (pid: %d) "
436 "and session handle %d with ret %d",
437 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
438 goto error;
439 }
440
441 DBG2("UST app event %s disabled successfully for app (pid: %d)",
442 ua_event->attr.name, app->key.pid);
443
444 error:
445 return ret;
446 }
447
448 /*
449 * Disable the specified channel on to UST tracer for the UST session.
450 */
451 static int disable_ust_channel(struct ust_app *app,
452 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
453 {
454 int ret;
455
456 ret = ustctl_disable(app->key.sock, ua_chan->obj);
457 if (ret < 0) {
458 ERR("UST app channel %s disable failed for app (pid: %d) "
459 "and session handle %d with ret %d",
460 ua_chan->name, app->key.pid, ua_sess->handle, ret);
461 goto error;
462 }
463
464 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
465 ua_chan->name, app->key.pid);
466
467 error:
468 return ret;
469 }
470
471 /*
472 * Enable the specified channel on to UST tracer for the UST session.
473 */
474 static int enable_ust_channel(struct ust_app *app,
475 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
476 {
477 int ret;
478
479 ret = ustctl_enable(app->key.sock, ua_chan->obj);
480 if (ret < 0) {
481 ERR("UST app channel %s enable failed for app (pid: %d) "
482 "and session handle %d with ret %d",
483 ua_chan->name, app->key.pid, ua_sess->handle, ret);
484 goto error;
485 }
486
487 ua_chan->enabled = 1;
488
489 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
490 ua_chan->name, app->key.pid);
491
492 error:
493 return ret;
494 }
495
496 /*
497 * Enable the specified event on to UST tracer for the UST session.
498 */
499 static int enable_ust_event(struct ust_app *app,
500 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
501 {
502 int ret;
503
504 ret = ustctl_enable(app->key.sock, ua_event->obj);
505 if (ret < 0) {
506 ERR("UST app event %s enable failed for app (pid: %d) "
507 "and session handle %d with ret %d",
508 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
509 goto error;
510 }
511
512 DBG2("UST app event %s enabled successfully for app (pid: %d)",
513 ua_event->attr.name, app->key.pid);
514
515 error:
516 return ret;
517 }
518
519 /*
520 * Open metadata onto the UST tracer for a UST session.
521 */
522 static int open_ust_metadata(struct ust_app *app,
523 struct ust_app_session *ua_sess)
524 {
525 int ret;
526 struct lttng_ust_channel_attr uattr;
527
528 uattr.overwrite = ua_sess->metadata->attr.overwrite;
529 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
530 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
531 uattr.switch_timer_interval =
532 ua_sess->metadata->attr.switch_timer_interval;
533 uattr.read_timer_interval =
534 ua_sess->metadata->attr.read_timer_interval;
535 uattr.output = ua_sess->metadata->attr.output;
536
537 /* UST tracer metadata creation */
538 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
539 &ua_sess->metadata->obj);
540 if (ret < 0) {
541 ERR("UST app open metadata failed for app pid:%d with ret %d",
542 app->key.pid, ret);
543 goto error;
544 }
545
546 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
547
548 error:
549 return ret;
550 }
551
552 /*
553 * Create stream onto the UST tracer for a UST session.
554 */
555 static int create_ust_stream(struct ust_app *app,
556 struct ust_app_session *ua_sess)
557 {
558 int ret;
559
560 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
561 &ua_sess->metadata->stream_obj);
562 if (ret < 0) {
563 ERR("UST create metadata stream failed");
564 goto error;
565 }
566
567 error:
568 return ret;
569 }
570
571 /*
572 * Create the specified channel onto the UST tracer for a UST session.
573 */
574 static int create_ust_channel(struct ust_app *app,
575 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
576 {
577 int ret;
578
579 /* TODO: remove cast and use lttng-ust-abi.h */
580 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
581 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
582 if (ret < 0) {
583 ERR("Creating channel %s for app (pid: %d, sock: %d) "
584 "and session handle %d with ret %d",
585 ua_chan->name, app->key.pid, app->key.sock,
586 ua_sess->handle, ret);
587 goto error;
588 }
589
590 ua_chan->handle = ua_chan->obj->handle;
591
592 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
593 ua_chan->name, app->key.pid, app->key.sock);
594
595 /* If channel is not enabled, disable it on the tracer */
596 if (!ua_chan->enabled) {
597 ret = disable_ust_channel(app, ua_sess, ua_chan);
598 if (ret < 0) {
599 goto error;
600 }
601 }
602
603 error:
604 return ret;
605 }
606
607 /*
608 * Create the specified event onto the UST tracer for a UST session.
609 */
610 static
611 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
612 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
613 {
614 int ret = 0;
615
616 /* Create UST event on tracer */
617 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
618 &ua_event->obj);
619 if (ret < 0) {
620 if (ret == -EEXIST) {
621 ret = 0;
622 goto error;
623 }
624 ERR("Error ustctl create event %s for app pid: %d with ret %d",
625 ua_event->attr.name, app->key.pid, ret);
626 goto error;
627 }
628
629 ua_event->handle = ua_event->obj->handle;
630
631 DBG2("UST app event %s created successfully for pid:%d",
632 ua_event->attr.name, app->key.pid);
633
634 /* If event not enabled, disable it on the tracer */
635 if (ua_event->enabled == 0) {
636 ret = disable_ust_event(app, ua_sess, ua_event);
637 if (ret < 0) {
638 /*
639 * If we hit an EPERM, something is wrong with our disable call. If
640 * we get an EEXIST, there is a problem on the tracer side since we
641 * just created it.
642 */
643 switch (ret) {
644 case -EPERM:
645 /* Code flow problem */
646 assert(0);
647 case -EEXIST:
648 /* It's OK for our use case. */
649 ret = 0;
650 break;
651 default:
652 break;
653 }
654 goto error;
655 }
656 }
657
658 error:
659 return ret;
660 }
661
662 /*
663 * Copy data between an UST app event and a LTT event.
664 */
665 static void shadow_copy_event(struct ust_app_event *ua_event,
666 struct ltt_ust_event *uevent)
667 {
668 struct lttng_ht_iter iter;
669 struct ltt_ust_context *uctx;
670 struct ust_app_ctx *ua_ctx;
671
672 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
673 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
674
675 ua_event->enabled = uevent->enabled;
676
677 /* Copy event attributes */
678 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
679
680 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
681 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
682 if (ua_ctx == NULL) {
683 /* malloc() failed. We should simply stop */
684 return;
685 }
686
687 lttng_ht_node_init_ulong(&ua_ctx->node,
688 (unsigned long) ua_ctx->ctx.ctx);
689 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
690 }
691 }
692
693 /*
694 * Copy data between an UST app channel and a LTT channel.
695 */
696 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
697 struct ltt_ust_channel *uchan)
698 {
699 struct lttng_ht_iter iter;
700 struct lttng_ht_node_str *ua_event_node;
701 struct ltt_ust_event *uevent;
702 struct ltt_ust_context *uctx;
703 struct ust_app_event *ua_event;
704 struct ust_app_ctx *ua_ctx;
705
706 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
707
708 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
709 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
710 /* Copy event attributes */
711 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
712
713 ua_chan->enabled = uchan->enabled;
714
715 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
716 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
717 if (ua_ctx == NULL) {
718 continue;
719 }
720 lttng_ht_node_init_ulong(&ua_ctx->node,
721 (unsigned long) ua_ctx->ctx.ctx);
722 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
723 }
724
725 /* Copy all events from ltt ust channel to ust app channel */
726 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
727 struct lttng_ht_iter uiter;
728
729 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
730 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
731 if (ua_event_node == NULL) {
732 DBG2("UST event %s not found on shadow copy channel",
733 uevent->attr.name);
734 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
735 if (ua_event == NULL) {
736 continue;
737 }
738 shadow_copy_event(ua_event, uevent);
739 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
740 }
741 }
742
743 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
744 }
745
746 /*
747 * Copy data between a UST app session and a regular LTT session.
748 */
749 static void shadow_copy_session(struct ust_app_session *ua_sess,
750 struct ltt_ust_session *usess, struct ust_app *app)
751 {
752 struct lttng_ht_node_str *ua_chan_node;
753 struct lttng_ht_iter iter;
754 struct ltt_ust_channel *uchan;
755 struct ust_app_channel *ua_chan;
756 time_t rawtime;
757 struct tm *timeinfo;
758 char datetime[16];
759 int ret;
760
761 /* Get date and time for unique app path */
762 time(&rawtime);
763 timeinfo = localtime(&rawtime);
764 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
765
766 DBG2("Shadow copy of session handle %d", ua_sess->handle);
767
768 ua_sess->id = usess->id;
769 ua_sess->uid = usess->uid;
770 ua_sess->gid = usess->gid;
771
772 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
773 app->name, app->key.pid, datetime);
774 if (ret < 0) {
775 PERROR("asprintf UST shadow copy session");
776 /* TODO: We cannot return an error from here.. */
777 assert(0);
778 }
779
780 /* TODO: support all UST domain */
781
782 /* Iterate over all channels in global domain. */
783 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
784 uchan, node.node) {
785 struct lttng_ht_iter uiter;
786
787 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
788 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
789 if (ua_chan_node != NULL) {
790 /* Session exist. Contiuing. */
791 continue;
792 }
793
794 DBG2("Channel %s not found on shadow session copy, creating it",
795 uchan->name);
796 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
797 if (ua_chan == NULL) {
798 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
799 continue;
800 }
801
802 shadow_copy_channel(ua_chan, uchan);
803 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
804 }
805 }
806
807 /*
808 * Lookup sesison wrapper.
809 */
810 static
811 void __lookup_session_by_app(struct ltt_ust_session *usess,
812 struct ust_app *app, struct lttng_ht_iter *iter)
813 {
814 /* Get right UST app session from app */
815 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
816 }
817
818 /*
819 * Return ust app session from the app session hashtable using the UST session
820 * id.
821 */
822 static struct ust_app_session *lookup_session_by_app(
823 struct ltt_ust_session *usess, struct ust_app *app)
824 {
825 struct lttng_ht_iter iter;
826 struct lttng_ht_node_ulong *node;
827
828 __lookup_session_by_app(usess, app, &iter);
829 node = lttng_ht_iter_get_node_ulong(&iter);
830 if (node == NULL) {
831 goto error;
832 }
833
834 return caa_container_of(node, struct ust_app_session, node);
835
836 error:
837 return NULL;
838 }
839
840 /*
841 * Create a UST session onto the tracer of app and add it the session
842 * hashtable.
843 *
844 * Return ust app session or NULL on error.
845 */
846 static struct ust_app_session *create_ust_app_session(
847 struct ltt_ust_session *usess, struct ust_app *app)
848 {
849 int ret;
850 struct ust_app_session *ua_sess;
851
852 ua_sess = lookup_session_by_app(usess, app);
853 if (ua_sess == NULL) {
854 DBG2("UST app pid: %d session id %d not found, creating it",
855 app->key.pid, usess->id);
856 ua_sess = alloc_ust_app_session();
857 if (ua_sess == NULL) {
858 /* Only malloc can failed so something is really wrong */
859 goto end;
860 }
861 shadow_copy_session(ua_sess, usess, app);
862 }
863
864 if (ua_sess->handle == -1) {
865 ret = ustctl_create_session(app->key.sock);
866 if (ret < 0) {
867 ERR("Creating session for app pid %d", app->key.pid);
868 goto error;
869 }
870
871 ua_sess->handle = ret;
872
873 /* Add ust app session to app's HT */
874 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
875 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
876
877 DBG2("UST app session created successfully with handle %d", ret);
878 }
879
880 end:
881 return ua_sess;
882
883 error:
884 delete_ust_app_session(-1, ua_sess);
885 return NULL;
886 }
887
888 /*
889 * Create a context for the channel on the tracer.
890 */
891 static
892 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
893 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
894 struct ust_app *app)
895 {
896 int ret = 0;
897 struct lttng_ht_iter iter;
898 struct lttng_ht_node_ulong *node;
899 struct ust_app_ctx *ua_ctx;
900
901 DBG2("UST app adding context to channel %s", ua_chan->name);
902
903 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
904 node = lttng_ht_iter_get_node_ulong(&iter);
905 if (node != NULL) {
906 ret = -EEXIST;
907 goto error;
908 }
909
910 ua_ctx = alloc_ust_app_ctx(uctx);
911 if (ua_ctx == NULL) {
912 /* malloc failed */
913 ret = -1;
914 goto error;
915 }
916
917 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
918 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
919
920 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
921 if (ret < 0) {
922 goto error;
923 }
924
925 error:
926 return ret;
927 }
928
929 /*
930 * Create an UST context and enable it for the event on the tracer.
931 */
932 static
933 int create_ust_app_event_context(struct ust_app_session *ua_sess,
934 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
935 struct ust_app *app)
936 {
937 int ret = 0;
938 struct lttng_ht_iter iter;
939 struct lttng_ht_node_ulong *node;
940 struct ust_app_ctx *ua_ctx;
941
942 DBG2("UST app adding context to event %s", ua_event->name);
943
944 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
945 node = lttng_ht_iter_get_node_ulong(&iter);
946 if (node != NULL) {
947 ret = -EEXIST;
948 goto error;
949 }
950
951 ua_ctx = alloc_ust_app_ctx(uctx);
952 if (ua_ctx == NULL) {
953 /* malloc failed */
954 ret = -1;
955 goto error;
956 }
957
958 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
959 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
960
961 ret = create_ust_event_context(ua_event, ua_ctx, app);
962 if (ret < 0) {
963 goto error;
964 }
965
966 error:
967 return ret;
968 }
969
970 /*
971 * Enable on the tracer side a ust app event for the session and channel.
972 */
973 static
974 int enable_ust_app_event(struct ust_app_session *ua_sess,
975 struct ust_app_event *ua_event, struct ust_app *app)
976 {
977 int ret;
978
979 ret = enable_ust_event(app, ua_sess, ua_event);
980 if (ret < 0) {
981 goto error;
982 }
983
984 ua_event->enabled = 1;
985
986 error:
987 return ret;
988 }
989
990 /*
991 * Disable on the tracer side a ust app event for the session and channel.
992 */
993 static int disable_ust_app_event(struct ust_app_session *ua_sess,
994 struct ust_app_event *ua_event, struct ust_app *app)
995 {
996 int ret;
997
998 ret = disable_ust_event(app, ua_sess, ua_event);
999 if (ret < 0) {
1000 goto error;
1001 }
1002
1003 ua_event->enabled = 0;
1004
1005 error:
1006 return ret;
1007 }
1008
1009 /*
1010 * Lookup ust app channel for session and disable it on the tracer side.
1011 */
1012 static
1013 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1014 struct ust_app_channel *ua_chan, struct ust_app *app)
1015 {
1016 int ret;
1017
1018 ret = disable_ust_channel(app, ua_sess, ua_chan);
1019 if (ret < 0) {
1020 goto error;
1021 }
1022
1023 ua_chan->enabled = 0;
1024
1025 error:
1026 return ret;
1027 }
1028
1029 /*
1030 * Lookup ust app channel for session and enable it on the tracer side.
1031 */
1032 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1033 struct ltt_ust_channel *uchan, struct ust_app *app)
1034 {
1035 int ret = 0;
1036 struct lttng_ht_iter iter;
1037 struct lttng_ht_node_str *ua_chan_node;
1038 struct ust_app_channel *ua_chan;
1039
1040 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1041 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1042 if (ua_chan_node == NULL) {
1043 DBG2("Unable to find channel %s in ust session id %u",
1044 uchan->name, ua_sess->id);
1045 goto error;
1046 }
1047
1048 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1049
1050 ret = enable_ust_channel(app, ua_sess, ua_chan);
1051 if (ret < 0) {
1052 goto error;
1053 }
1054
1055 error:
1056 return ret;
1057 }
1058
1059 /*
1060 * Create UST app channel and create it on the tracer.
1061 */
1062 static struct ust_app_channel *create_ust_app_channel(
1063 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1064 struct ust_app *app)
1065 {
1066 int ret = 0;
1067 struct lttng_ht_iter iter;
1068 struct lttng_ht_node_str *ua_chan_node;
1069 struct ust_app_channel *ua_chan;
1070
1071 /* Lookup channel in the ust app session */
1072 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1073 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1074 if (ua_chan_node != NULL) {
1075 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1076 goto end;
1077 }
1078
1079 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1080 if (ua_chan == NULL) {
1081 /* Only malloc can fail here */
1082 goto error;
1083 }
1084 shadow_copy_channel(ua_chan, uchan);
1085
1086 ret = create_ust_channel(app, ua_sess, ua_chan);
1087 if (ret < 0) {
1088 /* Not found previously means that it does not exist on the tracer */
1089 assert(ret != -EEXIST);
1090 goto error;
1091 }
1092
1093 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1094
1095 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1096 app->key.pid);
1097
1098 end:
1099 return ua_chan;
1100
1101 error:
1102 delete_ust_app_channel(-1, ua_chan);
1103 return NULL;
1104 }
1105
1106 /*
1107 * Create UST app event and create it on the tracer side.
1108 */
1109 static
1110 int create_ust_app_event(struct ust_app_session *ua_sess,
1111 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1112 struct ust_app *app)
1113 {
1114 int ret = 0;
1115 struct lttng_ht_iter iter;
1116 struct lttng_ht_node_str *ua_event_node;
1117 struct ust_app_event *ua_event;
1118
1119 /* Get event node */
1120 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1121 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1122 if (ua_event_node != NULL) {
1123 ret = -EEXIST;
1124 goto end;
1125 }
1126
1127 /* Does not exist so create one */
1128 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1129 if (ua_event == NULL) {
1130 /* Only malloc can failed so something is really wrong */
1131 ret = -ENOMEM;
1132 goto end;
1133 }
1134 shadow_copy_event(ua_event, uevent);
1135
1136 /* Create it on the tracer side */
1137 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1138 if (ret < 0) {
1139 /* Not found previously means that it does not exist on the tracer */
1140 assert(ret != -EEXIST);
1141 goto error;
1142 }
1143
1144 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1145
1146 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1147 app->key.pid);
1148
1149 end:
1150 return ret;
1151
1152 error:
1153 /* Valid. Calling here is already in a read side lock */
1154 delete_ust_app_event(-1, ua_event);
1155 return ret;
1156 }
1157
1158 /*
1159 * Create UST metadata and open it on the tracer side.
1160 */
1161 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1162 char *pathname, struct ust_app *app)
1163 {
1164 int ret = 0;
1165
1166 if (ua_sess->metadata == NULL) {
1167 /* Allocate UST metadata */
1168 ua_sess->metadata = trace_ust_create_metadata(pathname);
1169 if (ua_sess->metadata == NULL) {
1170 /* malloc() failed */
1171 goto error;
1172 }
1173
1174 ret = open_ust_metadata(app, ua_sess);
1175 if (ret < 0) {
1176 DBG3("Opening metadata failed. Cleaning up memory");
1177
1178 /* Cleanup failed metadata struct */
1179 free(ua_sess->metadata);
1180 /*
1181 * This is very important because delete_ust_app_session check if
1182 * the pointer is null or not in order to delete the metadata.
1183 */
1184 ua_sess->metadata = NULL;
1185 goto error;
1186 }
1187
1188 DBG2("UST metadata opened for app pid %d", app->key.pid);
1189 }
1190
1191 /* Open UST metadata stream */
1192 if (ua_sess->metadata->stream_obj == NULL) {
1193 ret = create_ust_stream(app, ua_sess);
1194 if (ret < 0) {
1195 goto error;
1196 }
1197
1198 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
1199 ua_sess->uid, ua_sess->gid);
1200 if (ret < 0) {
1201 PERROR("mkdir UST metadata");
1202 goto error;
1203 }
1204
1205 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1206 "%s/metadata", ua_sess->path);
1207 if (ret < 0) {
1208 PERROR("asprintf UST create stream");
1209 goto error;
1210 }
1211
1212 DBG2("UST metadata stream object created for app pid %d",
1213 app->key.pid);
1214 } else {
1215 ERR("Attempting to create stream without metadata opened");
1216 goto error;
1217 }
1218
1219 return 0;
1220
1221 error:
1222 return -1;
1223 }
1224
1225 /*
1226 * Return pointer to traceable apps list.
1227 */
1228 struct lttng_ht *ust_app_get_ht(void)
1229 {
1230 return ust_app_ht;
1231 }
1232
1233 /*
1234 * Return ust app pointer or NULL if not found.
1235 */
1236 struct ust_app *ust_app_find_by_pid(pid_t pid)
1237 {
1238 struct lttng_ht_node_ulong *node;
1239 struct lttng_ht_iter iter;
1240
1241 rcu_read_lock();
1242 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1243 node = lttng_ht_iter_get_node_ulong(&iter);
1244 if (node == NULL) {
1245 DBG2("UST app no found with pid %d", pid);
1246 goto error;
1247 }
1248 rcu_read_unlock();
1249
1250 DBG2("Found UST app by pid %d", pid);
1251
1252 return caa_container_of(node, struct ust_app, node);
1253
1254 error:
1255 rcu_read_unlock();
1256 return NULL;
1257 }
1258
1259 /*
1260 * Using pid and uid (of the app), allocate a new ust_app struct and
1261 * add it to the global traceable app list.
1262 *
1263 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1264 * bitness is not supported.
1265 */
1266 int ust_app_register(struct ust_register_msg *msg, int sock)
1267 {
1268 struct ust_app *lta;
1269
1270 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1271 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1272 ERR("Registration failed: application \"%s\" (pid: %d) has "
1273 "%d-bit long, but no consumerd for this long size is available.\n",
1274 msg->name, msg->pid, msg->bits_per_long);
1275 close(sock);
1276 return -EINVAL;
1277 }
1278 lta = zmalloc(sizeof(struct ust_app));
1279 if (lta == NULL) {
1280 PERROR("malloc");
1281 return -ENOMEM;
1282 }
1283
1284 lta->ppid = msg->ppid;
1285 lta->uid = msg->uid;
1286 lta->gid = msg->gid;
1287 lta->compatible = 0; /* Not compatible until proven */
1288 lta->bits_per_long = msg->bits_per_long;
1289 lta->v_major = msg->major;
1290 lta->v_minor = msg->minor;
1291 strncpy(lta->name, msg->name, sizeof(lta->name));
1292 lta->name[16] = '\0';
1293 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1294
1295 /* Set key map */
1296 lta->key.pid = msg->pid;
1297 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
1298 lta->key.sock = sock;
1299 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
1300
1301 rcu_read_lock();
1302 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1303 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
1304 rcu_read_unlock();
1305
1306 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1307 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1308 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1309
1310 return 0;
1311 }
1312
1313 /*
1314 * Unregister app by removing it from the global traceable app list and freeing
1315 * the data struct.
1316 *
1317 * The socket is already closed at this point so no close to sock.
1318 */
1319 void ust_app_unregister(int sock)
1320 {
1321 struct ust_app *lta;
1322 struct lttng_ht_node_ulong *node;
1323 struct lttng_ht_iter iter;
1324 int ret;
1325
1326 rcu_read_lock();
1327 lta = find_app_by_sock(sock);
1328 if (lta == NULL) {
1329 ERR("Unregister app sock %d not found!", sock);
1330 goto error;
1331 }
1332
1333 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1334
1335 /* Remove application from socket hash table */
1336 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1337 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1338 assert(!ret);
1339
1340 /* Get the node reference for a call_rcu */
1341 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1342 node = lttng_ht_iter_get_node_ulong(&iter);
1343 if (node == NULL) {
1344 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1345 goto error;
1346 }
1347
1348 /* Remove application from PID hash table */
1349 ret = lttng_ht_del(ust_app_ht, &iter);
1350 assert(!ret);
1351 call_rcu(&node->head, delete_ust_app_rcu);
1352 error:
1353 rcu_read_unlock();
1354 return;
1355 }
1356
1357 /*
1358 * Return traceable_app_count
1359 */
1360 unsigned long ust_app_list_count(void)
1361 {
1362 unsigned long count;
1363
1364 rcu_read_lock();
1365 count = lttng_ht_get_count(ust_app_ht);
1366 rcu_read_unlock();
1367
1368 return count;
1369 }
1370
1371 /*
1372 * Fill events array with all events name of all registered apps.
1373 */
1374 int ust_app_list_events(struct lttng_event **events)
1375 {
1376 int ret, handle;
1377 size_t nbmem, count = 0;
1378 struct lttng_ht_iter iter;
1379 struct ust_app *app;
1380 struct lttng_event *tmp;
1381
1382 nbmem = UST_APP_EVENT_LIST_SIZE;
1383 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1384 if (tmp == NULL) {
1385 PERROR("zmalloc ust app events");
1386 ret = -ENOMEM;
1387 goto error;
1388 }
1389
1390 rcu_read_lock();
1391
1392 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1393 struct lttng_ust_tracepoint_iter uiter;
1394
1395 if (!app->compatible) {
1396 /*
1397 * TODO: In time, we should notice the caller of this error by
1398 * telling him that this is a version error.
1399 */
1400 continue;
1401 }
1402 handle = ustctl_tracepoint_list(app->key.sock);
1403 if (handle < 0) {
1404 ERR("UST app list events getting handle failed for app pid %d",
1405 app->key.pid);
1406 continue;
1407 }
1408
1409 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1410 &uiter)) != -ENOENT) {
1411 if (count >= nbmem) {
1412 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1413 2 * nbmem);
1414 nbmem *= 2;
1415 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1416 if (tmp == NULL) {
1417 PERROR("realloc ust app events");
1418 ret = -ENOMEM;
1419 goto rcu_error;
1420 }
1421 }
1422 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1423 tmp[count].loglevel = uiter.loglevel;
1424 tmp[count].type = LTTNG_UST_TRACEPOINT;
1425 tmp[count].pid = app->key.pid;
1426 tmp[count].enabled = -1;
1427 count++;
1428 }
1429 }
1430
1431 ret = count;
1432 *events = tmp;
1433
1434 DBG2("UST app list events done (%zu events)", count);
1435
1436 rcu_error:
1437 rcu_read_unlock();
1438 error:
1439 return ret;
1440 }
1441
1442 /*
1443 * Free and clean all traceable apps of the global list.
1444 */
1445 void ust_app_clean_list(void)
1446 {
1447 int ret;
1448 struct lttng_ht_iter iter;
1449 struct lttng_ht_node_ulong *node;
1450
1451 DBG2("UST app cleaning registered apps hash table");
1452
1453 rcu_read_lock();
1454
1455 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1456 ret = lttng_ht_del(ust_app_ht, &iter);
1457 assert(!ret);
1458 call_rcu(&node->head, delete_ust_app_rcu);
1459 }
1460 /* Destroy is done only when the ht is empty */
1461 lttng_ht_destroy(ust_app_ht);
1462
1463 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1464 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1465 assert(!ret);
1466 }
1467 /* Destroy is done only when the ht is empty */
1468 lttng_ht_destroy(ust_app_sock_key_map);
1469
1470 rcu_read_unlock();
1471 }
1472
1473 /*
1474 * Init UST app hash table.
1475 */
1476 void ust_app_ht_alloc(void)
1477 {
1478 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1479 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1480 }
1481
1482 /*
1483 * For a specific UST session, disable the channel for all registered apps.
1484 */
1485 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1486 struct ltt_ust_channel *uchan)
1487 {
1488 int ret = 0;
1489 struct lttng_ht_iter iter;
1490 struct lttng_ht_node_str *ua_chan_node;
1491 struct ust_app *app;
1492 struct ust_app_session *ua_sess;
1493 struct ust_app_channel *ua_chan;
1494
1495 if (usess == NULL || uchan == NULL) {
1496 ERR("Disabling UST global channel with NULL values");
1497 ret = -1;
1498 goto error;
1499 }
1500
1501 DBG2("UST app disabling channel %s from global domain for session id %d",
1502 uchan->name, usess->id);
1503
1504 rcu_read_lock();
1505
1506 /* For every registered applications */
1507 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1508 struct lttng_ht_iter uiter;
1509 if (!app->compatible) {
1510 /*
1511 * TODO: In time, we should notice the caller of this error by
1512 * telling him that this is a version error.
1513 */
1514 continue;
1515 }
1516 ua_sess = lookup_session_by_app(usess, app);
1517 if (ua_sess == NULL) {
1518 continue;
1519 }
1520
1521 /* Get channel */
1522 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1523 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1524 /* If the session if found for the app, the channel must be there */
1525 assert(ua_chan_node);
1526
1527 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1528 /* The channel must not be already disabled */
1529 assert(ua_chan->enabled == 1);
1530
1531 /* Disable channel onto application */
1532 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1533 if (ret < 0) {
1534 /* XXX: We might want to report this error at some point... */
1535 continue;
1536 }
1537 }
1538
1539 rcu_read_unlock();
1540
1541 error:
1542 return ret;
1543 }
1544
1545 /*
1546 * For a specific UST session, enable the channel for all registered apps.
1547 */
1548 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1549 struct ltt_ust_channel *uchan)
1550 {
1551 int ret = 0;
1552 struct lttng_ht_iter iter;
1553 struct ust_app *app;
1554 struct ust_app_session *ua_sess;
1555
1556 if (usess == NULL || uchan == NULL) {
1557 ERR("Adding UST global channel to NULL values");
1558 ret = -1;
1559 goto error;
1560 }
1561
1562 DBG2("UST app enabling channel %s to global domain for session id %d",
1563 uchan->name, usess->id);
1564
1565 rcu_read_lock();
1566
1567 /* For every registered applications */
1568 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1569 if (!app->compatible) {
1570 /*
1571 * TODO: In time, we should notice the caller of this error by
1572 * telling him that this is a version error.
1573 */
1574 continue;
1575 }
1576 ua_sess = lookup_session_by_app(usess, app);
1577 if (ua_sess == NULL) {
1578 continue;
1579 }
1580
1581 /* Enable channel onto application */
1582 ret = enable_ust_app_channel(ua_sess, uchan, app);
1583 if (ret < 0) {
1584 /* XXX: We might want to report this error at some point... */
1585 continue;
1586 }
1587 }
1588
1589 rcu_read_unlock();
1590
1591 error:
1592 return ret;
1593 }
1594
1595 /*
1596 * Disable an event in a channel and for a specific session.
1597 */
1598 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1599 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1600 {
1601 int ret = 0;
1602 struct lttng_ht_iter iter, uiter;
1603 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1604 struct ust_app *app;
1605 struct ust_app_session *ua_sess;
1606 struct ust_app_channel *ua_chan;
1607 struct ust_app_event *ua_event;
1608
1609 DBG("UST app disabling event %s for all apps in channel "
1610 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1611
1612 rcu_read_lock();
1613
1614 /* For all registered applications */
1615 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1616 if (!app->compatible) {
1617 /*
1618 * TODO: In time, we should notice the caller of this error by
1619 * telling him that this is a version error.
1620 */
1621 continue;
1622 }
1623 ua_sess = lookup_session_by_app(usess, app);
1624 if (ua_sess == NULL) {
1625 /* Next app */
1626 continue;
1627 }
1628
1629 /* Lookup channel in the ust app session */
1630 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1631 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1632 if (ua_chan_node == NULL) {
1633 DBG2("Channel %s not found in session id %d for app pid %d."
1634 "Skipping", uchan->name, usess->id, app->key.pid);
1635 continue;
1636 }
1637 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1638
1639 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1640 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1641 if (ua_event_node == NULL) {
1642 DBG2("Event %s not found in channel %s for app pid %d."
1643 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1644 continue;
1645 }
1646 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1647
1648 ret = disable_ust_app_event(ua_sess, ua_event, app);
1649 if (ret < 0) {
1650 /* XXX: Report error someday... */
1651 continue;
1652 }
1653 }
1654
1655 rcu_read_unlock();
1656
1657 return ret;
1658 }
1659
1660 /*
1661 * For a specific UST session and UST channel, the event for all
1662 * registered apps.
1663 */
1664 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1665 struct ltt_ust_channel *uchan)
1666 {
1667 int ret = 0;
1668 struct lttng_ht_iter iter, uiter;
1669 struct lttng_ht_node_str *ua_chan_node;
1670 struct ust_app *app;
1671 struct ust_app_session *ua_sess;
1672 struct ust_app_channel *ua_chan;
1673 struct ust_app_event *ua_event;
1674
1675 DBG("UST app disabling all event for all apps in channel "
1676 "%s for session id %d", uchan->name, usess->id);
1677
1678 rcu_read_lock();
1679
1680 /* For all registered applications */
1681 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1682 if (!app->compatible) {
1683 /*
1684 * TODO: In time, we should notice the caller of this error by
1685 * telling him that this is a version error.
1686 */
1687 continue;
1688 }
1689 ua_sess = lookup_session_by_app(usess, app);
1690 /* If ua_sess is NULL, there is a code flow error */
1691 assert(ua_sess);
1692
1693 /* Lookup channel in the ust app session */
1694 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1695 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1696 /* If the channel is not found, there is a code flow error */
1697 assert(ua_chan_node);
1698
1699 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1700
1701 /* Disable each events of channel */
1702 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1703 node.node) {
1704 ret = disable_ust_app_event(ua_sess, ua_event, app);
1705 if (ret < 0) {
1706 /* XXX: Report error someday... */
1707 continue;
1708 }
1709 }
1710 }
1711
1712 rcu_read_unlock();
1713
1714 return ret;
1715 }
1716
1717 /*
1718 * For a specific UST session, create the channel for all registered apps.
1719 */
1720 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1721 struct ltt_ust_channel *uchan)
1722 {
1723 struct lttng_ht_iter iter;
1724 struct ust_app *app;
1725 struct ust_app_session *ua_sess;
1726 struct ust_app_channel *ua_chan;
1727
1728 /* Very wrong code flow */
1729 assert(usess);
1730 assert(uchan);
1731
1732 DBG2("UST app adding channel %s to global domain for session id %d",
1733 uchan->name, usess->id);
1734
1735 rcu_read_lock();
1736
1737 /* For every registered applications */
1738 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1739 if (!app->compatible) {
1740 /*
1741 * TODO: In time, we should notice the caller of this error by
1742 * telling him that this is a version error.
1743 */
1744 continue;
1745 }
1746 /*
1747 * Create session on the tracer side and add it to app session HT. Note
1748 * that if session exist, it will simply return a pointer to the ust
1749 * app session.
1750 */
1751 ua_sess = create_ust_app_session(usess, app);
1752 if (ua_sess == NULL) {
1753 /* Major problem here and it's maybe the tracer or malloc() */
1754 goto error;
1755 }
1756
1757 /* Create channel onto application */
1758 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1759 if (ua_chan == NULL) {
1760 /* Major problem here and it's maybe the tracer or malloc() */
1761 goto error;
1762 }
1763 }
1764
1765 rcu_read_unlock();
1766
1767 return 0;
1768
1769 error:
1770 return -1;
1771 }
1772
1773 /*
1774 * Enable event for a specific session and channel on the tracer.
1775 */
1776 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1777 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1778 {
1779 int ret = 0;
1780 struct lttng_ht_iter iter, uiter;
1781 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1782 struct ust_app *app;
1783 struct ust_app_session *ua_sess;
1784 struct ust_app_channel *ua_chan;
1785 struct ust_app_event *ua_event;
1786
1787 DBG("UST app enabling event %s for all apps for session id %d",
1788 uevent->attr.name, usess->id);
1789
1790 /*
1791 * NOTE: At this point, this function is called only if the session and
1792 * channel passed are already created for all apps. and enabled on the
1793 * tracer also.
1794 */
1795
1796 rcu_read_lock();
1797
1798 /* For all registered applications */
1799 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1800 if (!app->compatible) {
1801 /*
1802 * TODO: In time, we should notice the caller of this error by
1803 * telling him that this is a version error.
1804 */
1805 continue;
1806 }
1807 ua_sess = lookup_session_by_app(usess, app);
1808 /* If ua_sess is NULL, there is a code flow error */
1809 assert(ua_sess);
1810
1811 /* Lookup channel in the ust app session */
1812 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1813 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1814 /* If the channel is not found, there is a code flow error */
1815 assert(ua_chan_node);
1816
1817 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1818
1819 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1820 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1821 if (ua_event_node == NULL) {
1822 DBG3("UST app enable event %s not found for app PID %d."
1823 "Skipping app", uevent->attr.name, app->key.pid);
1824 continue;
1825 }
1826 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1827
1828 ret = enable_ust_app_event(ua_sess, ua_event, app);
1829 if (ret < 0) {
1830 goto error;
1831 }
1832 }
1833
1834 error:
1835 rcu_read_unlock();
1836 return ret;
1837 }
1838
1839 /*
1840 * For a specific existing UST session and UST channel, creates the event for
1841 * all registered apps.
1842 */
1843 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1844 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1845 {
1846 int ret = 0;
1847 struct lttng_ht_iter iter, uiter;
1848 struct lttng_ht_node_str *ua_chan_node;
1849 struct ust_app *app;
1850 struct ust_app_session *ua_sess;
1851 struct ust_app_channel *ua_chan;
1852
1853 DBG("UST app creating event %s for all apps for session id %d",
1854 uevent->attr.name, usess->id);
1855
1856 rcu_read_lock();
1857
1858 /* For all registered applications */
1859 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1860 if (!app->compatible) {
1861 /*
1862 * TODO: In time, we should notice the caller of this error by
1863 * telling him that this is a version error.
1864 */
1865 continue;
1866 }
1867 ua_sess = lookup_session_by_app(usess, app);
1868 /* If ua_sess is NULL, there is a code flow error */
1869 assert(ua_sess);
1870
1871 /* Lookup channel in the ust app session */
1872 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1873 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1874 /* If the channel is not found, there is a code flow error */
1875 assert(ua_chan_node);
1876
1877 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1878
1879 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1880 if (ret < 0) {
1881 if (ret != -EEXIST) {
1882 /* Possible value at this point: -ENOMEM. If so, we stop! */
1883 break;
1884 }
1885 DBG2("UST app event %s already exist on app PID %d",
1886 uevent->attr.name, app->key.pid);
1887 continue;
1888 }
1889 }
1890
1891 rcu_read_unlock();
1892
1893 return ret;
1894 }
1895
1896 /*
1897 * Start tracing for a specific UST session and app.
1898 */
1899 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1900 {
1901 int ret = 0;
1902 struct lttng_ht_iter iter;
1903 struct ust_app_session *ua_sess;
1904 struct ust_app_channel *ua_chan;
1905 struct ltt_ust_stream *ustream;
1906 int consumerd_fd;
1907
1908 DBG("Starting tracing for ust app pid %d", app->key.pid);
1909
1910 rcu_read_lock();
1911
1912 if (!app->compatible) {
1913 goto end;
1914 }
1915
1916 ua_sess = lookup_session_by_app(usess, app);
1917 if (ua_sess == NULL) {
1918 goto error_rcu_unlock;
1919 }
1920
1921 /* Upon restart, we skip the setup, already done */
1922 if (ua_sess->started) {
1923 goto skip_setup;
1924 }
1925
1926 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1927 if (ret < 0) {
1928 goto error_rcu_unlock;
1929 }
1930
1931 /* For each channel */
1932 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1933 node.node) {
1934 /* Create all streams */
1935 while (1) {
1936 /* Create UST stream */
1937 ustream = zmalloc(sizeof(*ustream));
1938 if (ustream == NULL) {
1939 PERROR("zmalloc ust stream");
1940 goto error_rcu_unlock;
1941 }
1942
1943 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1944 &ustream->obj);
1945 if (ret < 0) {
1946 /* Got all streams */
1947 break;
1948 }
1949 ustream->handle = ustream->obj->handle;
1950
1951 /* Order is important */
1952 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1953 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1954 ua_sess->path, ua_chan->name,
1955 ua_chan->streams.count++);
1956 if (ret < 0) {
1957 PERROR("asprintf UST create stream");
1958 continue;
1959 }
1960 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1961 ustream->pathname);
1962 }
1963 }
1964
1965 switch (app->bits_per_long) {
1966 case 64:
1967 consumerd_fd = ust_consumerd64_fd;
1968 break;
1969 case 32:
1970 consumerd_fd = ust_consumerd32_fd;
1971 break;
1972 default:
1973 ret = -EINVAL;
1974 goto error_rcu_unlock;
1975 }
1976
1977 /* Setup UST consumer socket and send fds to it */
1978 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1979 if (ret < 0) {
1980 goto error_rcu_unlock;
1981 }
1982 ua_sess->started = 1;
1983
1984 skip_setup:
1985 /* This start the UST tracing */
1986 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1987 if (ret < 0) {
1988 ERR("Error starting tracing for app pid: %d", app->key.pid);
1989 goto error_rcu_unlock;
1990 }
1991
1992 /* Quiescent wait after starting trace */
1993 ustctl_wait_quiescent(app->key.sock);
1994
1995 end:
1996 rcu_read_unlock();
1997 return 0;
1998
1999 error_rcu_unlock:
2000 rcu_read_unlock();
2001 return -1;
2002 }
2003
2004 /*
2005 * Stop tracing for a specific UST session and app.
2006 */
2007 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2008 {
2009 int ret = 0;
2010 struct lttng_ht_iter iter;
2011 struct ust_app_session *ua_sess;
2012 struct ust_app_channel *ua_chan;
2013
2014 DBG("Stopping tracing for ust app pid %d", app->key.pid);
2015
2016 rcu_read_lock();
2017
2018 if (!app->compatible) {
2019 goto end;
2020 }
2021
2022 ua_sess = lookup_session_by_app(usess, app);
2023 if (ua_sess == NULL) {
2024 /* Only malloc can failed so something is really wrong */
2025 goto error_rcu_unlock;
2026 }
2027
2028 /* Not started, continuing. */
2029 if (ua_sess->started == 0) {
2030 goto end;
2031 }
2032
2033 /* This inhibits UST tracing */
2034 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
2035 if (ret < 0) {
2036 ERR("Error stopping tracing for app pid: %d", app->key.pid);
2037 goto error_rcu_unlock;
2038 }
2039
2040 /* Quiescent wait after stopping trace */
2041 ustctl_wait_quiescent(app->key.sock);
2042
2043 /* Flushing buffers */
2044 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2045 node.node) {
2046 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
2047 if (ret < 0) {
2048 ERR("UST app PID %d channel %s flush failed with ret %d",
2049 app->key.pid, ua_chan->name, ret);
2050 /* Continuing flushing all buffers */
2051 continue;
2052 }
2053 }
2054
2055 /* Flush all buffers before stopping */
2056 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
2057 if (ret < 0) {
2058 ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
2059 ret);
2060 }
2061
2062 ua_sess->started = 0;
2063
2064 end:
2065 rcu_read_unlock();
2066 return 0;
2067
2068 error_rcu_unlock:
2069 rcu_read_unlock();
2070 return -1;
2071 }
2072
2073 /*
2074 * Destroy a specific UST session in apps.
2075 */
2076 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2077 {
2078 struct ust_app_session *ua_sess;
2079 struct lttng_ust_object_data obj;
2080 struct lttng_ht_iter iter;
2081 struct lttng_ht_node_ulong *node;
2082 int ret;
2083
2084 DBG("Destroy tracing for ust app pid %d", app->key.pid);
2085
2086 rcu_read_lock();
2087
2088 if (!app->compatible) {
2089 goto end;
2090 }
2091
2092 __lookup_session_by_app(usess, app, &iter);
2093 node = lttng_ht_iter_get_node_ulong(&iter);
2094 if (node == NULL) {
2095 /* Only malloc can failed so something is really wrong */
2096 goto error_rcu_unlock;
2097 }
2098 ua_sess = caa_container_of(node, struct ust_app_session, node);
2099 ret = lttng_ht_del(app->sessions, &iter);
2100 assert(!ret);
2101 obj.handle = ua_sess->handle;
2102 obj.shm_fd = -1;
2103 obj.wait_fd = -1;
2104 obj.memory_map_size = 0;
2105 ustctl_release_object(app->key.sock, &obj);
2106
2107 delete_ust_app_session(app->key.sock, ua_sess);
2108
2109 /* Quiescent wait after stopping trace */
2110 ustctl_wait_quiescent(app->key.sock);
2111
2112 end:
2113 rcu_read_unlock();
2114 return 0;
2115
2116 error_rcu_unlock:
2117 rcu_read_unlock();
2118 return -1;
2119 }
2120
2121 /*
2122 * Start tracing for the UST session.
2123 */
2124 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2125 {
2126 int ret = 0;
2127 struct lttng_ht_iter iter;
2128 struct ust_app *app;
2129
2130 DBG("Starting all UST traces");
2131
2132 rcu_read_lock();
2133
2134 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2135 ret = ust_app_start_trace(usess, app);
2136 if (ret < 0) {
2137 /* Continue to next apps even on error */
2138 continue;
2139 }
2140 }
2141
2142 rcu_read_unlock();
2143
2144 return 0;
2145 }
2146
2147 /*
2148 * Start tracing for the UST session.
2149 */
2150 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2151 {
2152 int ret = 0;
2153 struct lttng_ht_iter iter;
2154 struct ust_app *app;
2155
2156 DBG("Stopping all UST traces");
2157
2158 rcu_read_lock();
2159
2160 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2161 ret = ust_app_stop_trace(usess, app);
2162 if (ret < 0) {
2163 /* Continue to next apps even on error */
2164 continue;
2165 }
2166 }
2167
2168 rcu_read_unlock();
2169
2170 return 0;
2171 }
2172
2173 /*
2174 * Destroy app UST session.
2175 */
2176 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2177 {
2178 int ret = 0;
2179 struct lttng_ht_iter iter;
2180 struct ust_app *app;
2181
2182 DBG("Destroy all UST traces");
2183
2184 rcu_read_lock();
2185
2186 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2187 ret = ust_app_destroy_trace(usess, app);
2188 if (ret < 0) {
2189 /* Continue to next apps even on error */
2190 continue;
2191 }
2192 }
2193
2194 rcu_read_unlock();
2195
2196 return 0;
2197 }
2198
2199 /*
2200 * Add channels/events from UST global domain to registered apps at sock.
2201 */
2202 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2203 {
2204 int ret = 0;
2205 struct lttng_ht_iter iter, uiter, iter_ctx;
2206 struct ust_app *app;
2207 struct ust_app_session *ua_sess;
2208 struct ust_app_channel *ua_chan;
2209 struct ust_app_event *ua_event;
2210 struct ust_app_ctx *ua_ctx;
2211
2212 if (usess == NULL) {
2213 ERR("No UST session on global update. Returning");
2214 goto error;
2215 }
2216
2217 DBG2("UST app global update for app sock %d for session id %d", sock,
2218 usess->id);
2219
2220 rcu_read_lock();
2221
2222 app = find_app_by_sock(sock);
2223 if (app == NULL) {
2224 ERR("Failed to update app sock %d", sock);
2225 goto error;
2226 }
2227
2228 if (!app->compatible) {
2229 goto error;
2230 }
2231
2232 ua_sess = create_ust_app_session(usess, app);
2233 if (ua_sess == NULL) {
2234 goto error;
2235 }
2236
2237 /*
2238 * We can iterate safely here over all UST app session sicne the create ust
2239 * app session above made a shadow copy of the UST global domain from the
2240 * ltt ust session.
2241 */
2242 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2243 node.node) {
2244 ret = create_ust_channel(app, ua_sess, ua_chan);
2245 if (ret < 0) {
2246 /* FIXME: Should we quit here or continue... */
2247 continue;
2248 }
2249
2250 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2251 node.node) {
2252 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2253 if (ret < 0) {
2254 /* FIXME: Should we quit here or continue... */
2255 continue;
2256 }
2257 }
2258
2259
2260 /* For each events */
2261 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2262 node.node) {
2263 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2264 if (ret < 0) {
2265 /* FIXME: Should we quit here or continue... */
2266 continue;
2267 }
2268
2269 /* Add context on events. */
2270 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2271 ua_ctx, node.node) {
2272 ret = create_ust_event_context(ua_event, ua_ctx, app);
2273 if (ret < 0) {
2274 /* FIXME: Should we quit here or continue... */
2275 continue;
2276 }
2277 }
2278 }
2279 }
2280
2281 if (usess->start_trace) {
2282 ret = ust_app_start_trace(usess, app);
2283 if (ret < 0) {
2284 goto error;
2285 }
2286
2287 DBG2("UST trace started for app pid %d", app->key.pid);
2288 }
2289
2290 error:
2291 rcu_read_unlock();
2292 return;
2293 }
2294
2295 /*
2296 * Add context to a specific channel for global UST domain.
2297 */
2298 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2299 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2300 {
2301 int ret = 0;
2302 struct lttng_ht_node_str *ua_chan_node;
2303 struct lttng_ht_iter iter, uiter;
2304 struct ust_app_channel *ua_chan = NULL;
2305 struct ust_app_session *ua_sess;
2306 struct ust_app *app;
2307
2308 rcu_read_lock();
2309
2310 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2311 if (!app->compatible) {
2312 /*
2313 * TODO: In time, we should notice the caller of this error by
2314 * telling him that this is a version error.
2315 */
2316 continue;
2317 }
2318 ua_sess = lookup_session_by_app(usess, app);
2319 if (ua_sess == NULL) {
2320 continue;
2321 }
2322
2323 /* Lookup channel in the ust app session */
2324 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2325 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2326 if (ua_chan_node == NULL) {
2327 continue;
2328 }
2329 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2330 node);
2331
2332 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2333 if (ret < 0) {
2334 continue;
2335 }
2336 }
2337
2338 rcu_read_unlock();
2339 return ret;
2340 }
2341
2342 /*
2343 * Add context to a specific event in a channel for global UST domain.
2344 */
2345 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2346 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2347 struct ltt_ust_context *uctx)
2348 {
2349 int ret = 0;
2350 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2351 struct lttng_ht_iter iter, uiter;
2352 struct ust_app_session *ua_sess;
2353 struct ust_app_event *ua_event;
2354 struct ust_app_channel *ua_chan = NULL;
2355 struct ust_app *app;
2356
2357 rcu_read_lock();
2358
2359 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2360 if (!app->compatible) {
2361 /*
2362 * TODO: In time, we should notice the caller of this error by
2363 * telling him that this is a version error.
2364 */
2365 continue;
2366 }
2367 ua_sess = lookup_session_by_app(usess, app);
2368 if (ua_sess == NULL) {
2369 continue;
2370 }
2371
2372 /* Lookup channel in the ust app session */
2373 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2374 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2375 if (ua_chan_node == NULL) {
2376 continue;
2377 }
2378 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2379 node);
2380
2381 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2382 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2383 if (ua_event_node == NULL) {
2384 continue;
2385 }
2386 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2387 node);
2388
2389 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2390 if (ret < 0) {
2391 continue;
2392 }
2393 }
2394
2395 rcu_read_unlock();
2396 return ret;
2397 }
2398
2399 /*
2400 * Enable event for a channel from a UST session for a specific PID.
2401 */
2402 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2403 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2404 {
2405 int ret = 0;
2406 struct lttng_ht_iter iter;
2407 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2408 struct ust_app *app;
2409 struct ust_app_session *ua_sess;
2410 struct ust_app_channel *ua_chan;
2411 struct ust_app_event *ua_event;
2412
2413 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2414
2415 rcu_read_lock();
2416
2417 app = ust_app_find_by_pid(pid);
2418 if (app == NULL) {
2419 ERR("UST app enable event per PID %d not found", pid);
2420 ret = -1;
2421 goto error;
2422 }
2423
2424 if (!app->compatible) {
2425 ret = 0;
2426 goto error;
2427 }
2428
2429 ua_sess = lookup_session_by_app(usess, app);
2430 /* If ua_sess is NULL, there is a code flow error */
2431 assert(ua_sess);
2432
2433 /* Lookup channel in the ust app session */
2434 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2435 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2436 /* If the channel is not found, there is a code flow error */
2437 assert(ua_chan_node);
2438
2439 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2440
2441 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2442 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2443 if (ua_event_node == NULL) {
2444 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2445 if (ret < 0) {
2446 goto error;
2447 }
2448 } else {
2449 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2450
2451 ret = enable_ust_app_event(ua_sess, ua_event, app);
2452 if (ret < 0) {
2453 goto error;
2454 }
2455 }
2456
2457 error:
2458 rcu_read_unlock();
2459 return ret;
2460 }
2461
2462 /*
2463 * Disable event for a channel from a UST session for a specific PID.
2464 */
2465 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2466 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2467 {
2468 int ret = 0;
2469 struct lttng_ht_iter iter;
2470 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2471 struct ust_app *app;
2472 struct ust_app_session *ua_sess;
2473 struct ust_app_channel *ua_chan;
2474 struct ust_app_event *ua_event;
2475
2476 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2477
2478 rcu_read_lock();
2479
2480 app = ust_app_find_by_pid(pid);
2481 if (app == NULL) {
2482 ERR("UST app disable event per PID %d not found", pid);
2483 ret = -1;
2484 goto error;
2485 }
2486
2487 if (!app->compatible) {
2488 ret = 0;
2489 goto error;
2490 }
2491
2492 ua_sess = lookup_session_by_app(usess, app);
2493 /* If ua_sess is NULL, there is a code flow error */
2494 assert(ua_sess);
2495
2496 /* Lookup channel in the ust app session */
2497 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2498 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2499 if (ua_chan_node == NULL) {
2500 /* Channel does not exist, skip disabling */
2501 goto error;
2502 }
2503 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2504
2505 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2506 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2507 if (ua_event_node == NULL) {
2508 /* Event does not exist, skip disabling */
2509 goto error;
2510 }
2511 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2512
2513 ret = disable_ust_app_event(ua_sess, ua_event, app);
2514 if (ret < 0) {
2515 goto error;
2516 }
2517
2518 error:
2519 rcu_read_unlock();
2520 return ret;
2521 }
2522
2523 /*
2524 * Validate version of UST apps and set the compatible bit.
2525 */
2526 int ust_app_validate_version(int sock)
2527 {
2528 int ret;
2529 struct ust_app *app;
2530
2531 rcu_read_lock();
2532
2533 app = find_app_by_sock(sock);
2534 assert(app);
2535
2536 ret = ustctl_tracer_version(sock, &app->version);
2537 if (ret < 0) {
2538 goto error;
2539 }
2540
2541 /* Validate version */
2542 if (app->version.major > UST_APP_MAJOR_VERSION) {
2543 goto error;
2544 }
2545
2546 DBG2("UST app PID %d is compatible with major version %d "
2547 "(supporting <= %d)", app->key.pid, app->version.major,
2548 UST_APP_MAJOR_VERSION);
2549 app->compatible = 1;
2550 rcu_read_unlock();
2551 return 0;
2552
2553 error:
2554 DBG2("UST app PID %d is not compatible with major version %d "
2555 "(supporting <= %d)", app->key.pid, app->version.major,
2556 UST_APP_MAJOR_VERSION);
2557 app->compatible = 0;
2558 rcu_read_unlock();
2559 return -1;
2560 }
2561
2562 /*
2563 * Calibrate registered applications.
2564 */
2565 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2566 {
2567 int ret = 0;
2568 struct lttng_ht_iter iter;
2569 struct ust_app *app;
2570
2571 rcu_read_lock();
2572
2573 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2574 if (!app->compatible) {
2575 /*
2576 * TODO: In time, we should notice the caller of this error by
2577 * telling him that this is a version error.
2578 */
2579 continue;
2580 }
2581
2582 ret = ustctl_calibrate(app->key.sock, calibrate);
2583 if (ret < 0) {
2584 switch (ret) {
2585 case -ENOSYS:
2586 /* Means that it's not implemented on the tracer side. */
2587 ret = 0;
2588 break;
2589 default:
2590 /* TODO: Report error to user */
2591 DBG2("Calibrate app PID %d returned with error %d",
2592 app->key.pid, ret);
2593 break;
2594 }
2595 }
2596 }
2597
2598 DBG("UST app global domain calibration finished");
2599
2600 rcu_read_unlock();
2601
2602 return ret;
2603 }
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