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Verify UST comm proto version
[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 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1279 ERR("Registration failed: application \"%s\" (pid: %d) has "
1280 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1281 msg->name, msg->pid, msg->major, msg->minor);
1282 close(sock);
1283 return -EINVAL;
1284 }
1285 lta = zmalloc(sizeof(struct ust_app));
1286 if (lta == NULL) {
1287 PERROR("malloc");
1288 return -ENOMEM;
1289 }
1290
1291 lta->ppid = msg->ppid;
1292 lta->uid = msg->uid;
1293 lta->gid = msg->gid;
1294 lta->compatible = 0; /* Not compatible until proven */
1295 lta->bits_per_long = msg->bits_per_long;
1296 lta->v_major = msg->major;
1297 lta->v_minor = msg->minor;
1298 strncpy(lta->name, msg->name, sizeof(lta->name));
1299 lta->name[16] = '\0';
1300 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1301
1302 /* Set key map */
1303 lta->key.pid = msg->pid;
1304 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
1305 lta->key.sock = sock;
1306 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
1307
1308 rcu_read_lock();
1309 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1310 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
1311 rcu_read_unlock();
1312
1313 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1314 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1315 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1316
1317 return 0;
1318 }
1319
1320 /*
1321 * Unregister app by removing it from the global traceable app list and freeing
1322 * the data struct.
1323 *
1324 * The socket is already closed at this point so no close to sock.
1325 */
1326 void ust_app_unregister(int sock)
1327 {
1328 struct ust_app *lta;
1329 struct lttng_ht_node_ulong *node;
1330 struct lttng_ht_iter iter;
1331 int ret;
1332
1333 rcu_read_lock();
1334 lta = find_app_by_sock(sock);
1335 if (lta == NULL) {
1336 ERR("Unregister app sock %d not found!", sock);
1337 goto error;
1338 }
1339
1340 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1341
1342 /* Remove application from socket hash table */
1343 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1344 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1345 assert(!ret);
1346
1347 /* Get the node reference for a call_rcu */
1348 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1349 node = lttng_ht_iter_get_node_ulong(&iter);
1350 if (node == NULL) {
1351 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1352 goto error;
1353 }
1354
1355 /* Remove application from PID hash table */
1356 ret = lttng_ht_del(ust_app_ht, &iter);
1357 assert(!ret);
1358 call_rcu(&node->head, delete_ust_app_rcu);
1359 error:
1360 rcu_read_unlock();
1361 return;
1362 }
1363
1364 /*
1365 * Return traceable_app_count
1366 */
1367 unsigned long ust_app_list_count(void)
1368 {
1369 unsigned long count;
1370
1371 rcu_read_lock();
1372 count = lttng_ht_get_count(ust_app_ht);
1373 rcu_read_unlock();
1374
1375 return count;
1376 }
1377
1378 /*
1379 * Fill events array with all events name of all registered apps.
1380 */
1381 int ust_app_list_events(struct lttng_event **events)
1382 {
1383 int ret, handle;
1384 size_t nbmem, count = 0;
1385 struct lttng_ht_iter iter;
1386 struct ust_app *app;
1387 struct lttng_event *tmp;
1388
1389 nbmem = UST_APP_EVENT_LIST_SIZE;
1390 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1391 if (tmp == NULL) {
1392 PERROR("zmalloc ust app events");
1393 ret = -ENOMEM;
1394 goto error;
1395 }
1396
1397 rcu_read_lock();
1398
1399 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1400 struct lttng_ust_tracepoint_iter uiter;
1401
1402 if (!app->compatible) {
1403 /*
1404 * TODO: In time, we should notice the caller of this error by
1405 * telling him that this is a version error.
1406 */
1407 continue;
1408 }
1409 handle = ustctl_tracepoint_list(app->key.sock);
1410 if (handle < 0) {
1411 ERR("UST app list events getting handle failed for app pid %d",
1412 app->key.pid);
1413 continue;
1414 }
1415
1416 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1417 &uiter)) != -ENOENT) {
1418 if (count >= nbmem) {
1419 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1420 2 * nbmem);
1421 nbmem *= 2;
1422 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1423 if (tmp == NULL) {
1424 PERROR("realloc ust app events");
1425 ret = -ENOMEM;
1426 goto rcu_error;
1427 }
1428 }
1429 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1430 tmp[count].loglevel = uiter.loglevel;
1431 tmp[count].type = LTTNG_UST_TRACEPOINT;
1432 tmp[count].pid = app->key.pid;
1433 tmp[count].enabled = -1;
1434 count++;
1435 }
1436 }
1437
1438 ret = count;
1439 *events = tmp;
1440
1441 DBG2("UST app list events done (%zu events)", count);
1442
1443 rcu_error:
1444 rcu_read_unlock();
1445 error:
1446 return ret;
1447 }
1448
1449 /*
1450 * Free and clean all traceable apps of the global list.
1451 */
1452 void ust_app_clean_list(void)
1453 {
1454 int ret;
1455 struct lttng_ht_iter iter;
1456 struct lttng_ht_node_ulong *node;
1457
1458 DBG2("UST app cleaning registered apps hash table");
1459
1460 rcu_read_lock();
1461
1462 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1463 ret = lttng_ht_del(ust_app_ht, &iter);
1464 assert(!ret);
1465 call_rcu(&node->head, delete_ust_app_rcu);
1466 }
1467 /* Destroy is done only when the ht is empty */
1468 lttng_ht_destroy(ust_app_ht);
1469
1470 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1471 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1472 assert(!ret);
1473 }
1474 /* Destroy is done only when the ht is empty */
1475 lttng_ht_destroy(ust_app_sock_key_map);
1476
1477 rcu_read_unlock();
1478 }
1479
1480 /*
1481 * Init UST app hash table.
1482 */
1483 void ust_app_ht_alloc(void)
1484 {
1485 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1486 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1487 }
1488
1489 /*
1490 * For a specific UST session, disable the channel for all registered apps.
1491 */
1492 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1493 struct ltt_ust_channel *uchan)
1494 {
1495 int ret = 0;
1496 struct lttng_ht_iter iter;
1497 struct lttng_ht_node_str *ua_chan_node;
1498 struct ust_app *app;
1499 struct ust_app_session *ua_sess;
1500 struct ust_app_channel *ua_chan;
1501
1502 if (usess == NULL || uchan == NULL) {
1503 ERR("Disabling UST global channel with NULL values");
1504 ret = -1;
1505 goto error;
1506 }
1507
1508 DBG2("UST app disabling channel %s from global domain for session id %d",
1509 uchan->name, usess->id);
1510
1511 rcu_read_lock();
1512
1513 /* For every registered applications */
1514 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1515 struct lttng_ht_iter uiter;
1516 if (!app->compatible) {
1517 /*
1518 * TODO: In time, we should notice the caller of this error by
1519 * telling him that this is a version error.
1520 */
1521 continue;
1522 }
1523 ua_sess = lookup_session_by_app(usess, app);
1524 if (ua_sess == NULL) {
1525 continue;
1526 }
1527
1528 /* Get channel */
1529 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1530 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1531 /* If the session if found for the app, the channel must be there */
1532 assert(ua_chan_node);
1533
1534 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1535 /* The channel must not be already disabled */
1536 assert(ua_chan->enabled == 1);
1537
1538 /* Disable channel onto application */
1539 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1540 if (ret < 0) {
1541 /* XXX: We might want to report this error at some point... */
1542 continue;
1543 }
1544 }
1545
1546 rcu_read_unlock();
1547
1548 error:
1549 return ret;
1550 }
1551
1552 /*
1553 * For a specific UST session, enable the channel for all registered apps.
1554 */
1555 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1556 struct ltt_ust_channel *uchan)
1557 {
1558 int ret = 0;
1559 struct lttng_ht_iter iter;
1560 struct ust_app *app;
1561 struct ust_app_session *ua_sess;
1562
1563 if (usess == NULL || uchan == NULL) {
1564 ERR("Adding UST global channel to NULL values");
1565 ret = -1;
1566 goto error;
1567 }
1568
1569 DBG2("UST app enabling channel %s to global domain for session id %d",
1570 uchan->name, usess->id);
1571
1572 rcu_read_lock();
1573
1574 /* For every registered applications */
1575 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1576 if (!app->compatible) {
1577 /*
1578 * TODO: In time, we should notice the caller of this error by
1579 * telling him that this is a version error.
1580 */
1581 continue;
1582 }
1583 ua_sess = lookup_session_by_app(usess, app);
1584 if (ua_sess == NULL) {
1585 continue;
1586 }
1587
1588 /* Enable channel onto application */
1589 ret = enable_ust_app_channel(ua_sess, uchan, app);
1590 if (ret < 0) {
1591 /* XXX: We might want to report this error at some point... */
1592 continue;
1593 }
1594 }
1595
1596 rcu_read_unlock();
1597
1598 error:
1599 return ret;
1600 }
1601
1602 /*
1603 * Disable an event in a channel and for a specific session.
1604 */
1605 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1606 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1607 {
1608 int ret = 0;
1609 struct lttng_ht_iter iter, uiter;
1610 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1611 struct ust_app *app;
1612 struct ust_app_session *ua_sess;
1613 struct ust_app_channel *ua_chan;
1614 struct ust_app_event *ua_event;
1615
1616 DBG("UST app disabling event %s for all apps in channel "
1617 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1618
1619 rcu_read_lock();
1620
1621 /* For all registered applications */
1622 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1623 if (!app->compatible) {
1624 /*
1625 * TODO: In time, we should notice the caller of this error by
1626 * telling him that this is a version error.
1627 */
1628 continue;
1629 }
1630 ua_sess = lookup_session_by_app(usess, app);
1631 if (ua_sess == NULL) {
1632 /* Next app */
1633 continue;
1634 }
1635
1636 /* Lookup channel in the ust app session */
1637 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1638 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1639 if (ua_chan_node == NULL) {
1640 DBG2("Channel %s not found in session id %d for app pid %d."
1641 "Skipping", uchan->name, usess->id, app->key.pid);
1642 continue;
1643 }
1644 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1645
1646 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1647 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1648 if (ua_event_node == NULL) {
1649 DBG2("Event %s not found in channel %s for app pid %d."
1650 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1651 continue;
1652 }
1653 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1654
1655 ret = disable_ust_app_event(ua_sess, ua_event, app);
1656 if (ret < 0) {
1657 /* XXX: Report error someday... */
1658 continue;
1659 }
1660 }
1661
1662 rcu_read_unlock();
1663
1664 return ret;
1665 }
1666
1667 /*
1668 * For a specific UST session and UST channel, the event for all
1669 * registered apps.
1670 */
1671 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1672 struct ltt_ust_channel *uchan)
1673 {
1674 int ret = 0;
1675 struct lttng_ht_iter iter, uiter;
1676 struct lttng_ht_node_str *ua_chan_node;
1677 struct ust_app *app;
1678 struct ust_app_session *ua_sess;
1679 struct ust_app_channel *ua_chan;
1680 struct ust_app_event *ua_event;
1681
1682 DBG("UST app disabling all event for all apps in channel "
1683 "%s for session id %d", uchan->name, usess->id);
1684
1685 rcu_read_lock();
1686
1687 /* For all registered applications */
1688 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1689 if (!app->compatible) {
1690 /*
1691 * TODO: In time, we should notice the caller of this error by
1692 * telling him that this is a version error.
1693 */
1694 continue;
1695 }
1696 ua_sess = lookup_session_by_app(usess, app);
1697 /* If ua_sess is NULL, there is a code flow error */
1698 assert(ua_sess);
1699
1700 /* Lookup channel in the ust app session */
1701 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1702 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1703 /* If the channel is not found, there is a code flow error */
1704 assert(ua_chan_node);
1705
1706 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1707
1708 /* Disable each events of channel */
1709 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1710 node.node) {
1711 ret = disable_ust_app_event(ua_sess, ua_event, app);
1712 if (ret < 0) {
1713 /* XXX: Report error someday... */
1714 continue;
1715 }
1716 }
1717 }
1718
1719 rcu_read_unlock();
1720
1721 return ret;
1722 }
1723
1724 /*
1725 * For a specific UST session, create the channel for all registered apps.
1726 */
1727 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1728 struct ltt_ust_channel *uchan)
1729 {
1730 struct lttng_ht_iter iter;
1731 struct ust_app *app;
1732 struct ust_app_session *ua_sess;
1733 struct ust_app_channel *ua_chan;
1734
1735 /* Very wrong code flow */
1736 assert(usess);
1737 assert(uchan);
1738
1739 DBG2("UST app adding channel %s to global domain for session id %d",
1740 uchan->name, usess->id);
1741
1742 rcu_read_lock();
1743
1744 /* For every registered applications */
1745 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1746 if (!app->compatible) {
1747 /*
1748 * TODO: In time, we should notice the caller of this error by
1749 * telling him that this is a version error.
1750 */
1751 continue;
1752 }
1753 /*
1754 * Create session on the tracer side and add it to app session HT. Note
1755 * that if session exist, it will simply return a pointer to the ust
1756 * app session.
1757 */
1758 ua_sess = create_ust_app_session(usess, app);
1759 if (ua_sess == NULL) {
1760 /* Major problem here and it's maybe the tracer or malloc() */
1761 goto error;
1762 }
1763
1764 /* Create channel onto application */
1765 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1766 if (ua_chan == NULL) {
1767 /* Major problem here and it's maybe the tracer or malloc() */
1768 goto error;
1769 }
1770 }
1771
1772 rcu_read_unlock();
1773
1774 return 0;
1775
1776 error:
1777 return -1;
1778 }
1779
1780 /*
1781 * Enable event for a specific session and channel on the tracer.
1782 */
1783 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1784 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1785 {
1786 int ret = 0;
1787 struct lttng_ht_iter iter, uiter;
1788 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1789 struct ust_app *app;
1790 struct ust_app_session *ua_sess;
1791 struct ust_app_channel *ua_chan;
1792 struct ust_app_event *ua_event;
1793
1794 DBG("UST app enabling event %s for all apps for session id %d",
1795 uevent->attr.name, usess->id);
1796
1797 /*
1798 * NOTE: At this point, this function is called only if the session and
1799 * channel passed are already created for all apps. and enabled on the
1800 * tracer also.
1801 */
1802
1803 rcu_read_lock();
1804
1805 /* For all registered applications */
1806 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1807 if (!app->compatible) {
1808 /*
1809 * TODO: In time, we should notice the caller of this error by
1810 * telling him that this is a version error.
1811 */
1812 continue;
1813 }
1814 ua_sess = lookup_session_by_app(usess, app);
1815 /* If ua_sess is NULL, there is a code flow error */
1816 assert(ua_sess);
1817
1818 /* Lookup channel in the ust app session */
1819 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1820 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1821 /* If the channel is not found, there is a code flow error */
1822 assert(ua_chan_node);
1823
1824 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1825
1826 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1827 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1828 if (ua_event_node == NULL) {
1829 DBG3("UST app enable event %s not found for app PID %d."
1830 "Skipping app", uevent->attr.name, app->key.pid);
1831 continue;
1832 }
1833 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1834
1835 ret = enable_ust_app_event(ua_sess, ua_event, app);
1836 if (ret < 0) {
1837 goto error;
1838 }
1839 }
1840
1841 error:
1842 rcu_read_unlock();
1843 return ret;
1844 }
1845
1846 /*
1847 * For a specific existing UST session and UST channel, creates the event for
1848 * all registered apps.
1849 */
1850 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1851 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1852 {
1853 int ret = 0;
1854 struct lttng_ht_iter iter, uiter;
1855 struct lttng_ht_node_str *ua_chan_node;
1856 struct ust_app *app;
1857 struct ust_app_session *ua_sess;
1858 struct ust_app_channel *ua_chan;
1859
1860 DBG("UST app creating event %s for all apps for session id %d",
1861 uevent->attr.name, usess->id);
1862
1863 rcu_read_lock();
1864
1865 /* For all registered applications */
1866 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1867 if (!app->compatible) {
1868 /*
1869 * TODO: In time, we should notice the caller of this error by
1870 * telling him that this is a version error.
1871 */
1872 continue;
1873 }
1874 ua_sess = lookup_session_by_app(usess, app);
1875 /* If ua_sess is NULL, there is a code flow error */
1876 assert(ua_sess);
1877
1878 /* Lookup channel in the ust app session */
1879 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1880 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1881 /* If the channel is not found, there is a code flow error */
1882 assert(ua_chan_node);
1883
1884 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1885
1886 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1887 if (ret < 0) {
1888 if (ret != -EEXIST) {
1889 /* Possible value at this point: -ENOMEM. If so, we stop! */
1890 break;
1891 }
1892 DBG2("UST app event %s already exist on app PID %d",
1893 uevent->attr.name, app->key.pid);
1894 continue;
1895 }
1896 }
1897
1898 rcu_read_unlock();
1899
1900 return ret;
1901 }
1902
1903 /*
1904 * Start tracing for a specific UST session and app.
1905 */
1906 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1907 {
1908 int ret = 0;
1909 struct lttng_ht_iter iter;
1910 struct ust_app_session *ua_sess;
1911 struct ust_app_channel *ua_chan;
1912 struct ltt_ust_stream *ustream;
1913 int consumerd_fd;
1914
1915 DBG("Starting tracing for ust app pid %d", app->key.pid);
1916
1917 rcu_read_lock();
1918
1919 if (!app->compatible) {
1920 goto end;
1921 }
1922
1923 ua_sess = lookup_session_by_app(usess, app);
1924 if (ua_sess == NULL) {
1925 goto error_rcu_unlock;
1926 }
1927
1928 /* Upon restart, we skip the setup, already done */
1929 if (ua_sess->started) {
1930 goto skip_setup;
1931 }
1932
1933 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1934 if (ret < 0) {
1935 goto error_rcu_unlock;
1936 }
1937
1938 /* For each channel */
1939 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1940 node.node) {
1941 /* Create all streams */
1942 while (1) {
1943 /* Create UST stream */
1944 ustream = zmalloc(sizeof(*ustream));
1945 if (ustream == NULL) {
1946 PERROR("zmalloc ust stream");
1947 goto error_rcu_unlock;
1948 }
1949
1950 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1951 &ustream->obj);
1952 if (ret < 0) {
1953 /* Got all streams */
1954 break;
1955 }
1956 ustream->handle = ustream->obj->handle;
1957
1958 /* Order is important */
1959 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1960 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1961 ua_sess->path, ua_chan->name,
1962 ua_chan->streams.count++);
1963 if (ret < 0) {
1964 PERROR("asprintf UST create stream");
1965 continue;
1966 }
1967 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1968 ustream->pathname);
1969 }
1970 }
1971
1972 switch (app->bits_per_long) {
1973 case 64:
1974 consumerd_fd = ust_consumerd64_fd;
1975 break;
1976 case 32:
1977 consumerd_fd = ust_consumerd32_fd;
1978 break;
1979 default:
1980 ret = -EINVAL;
1981 goto error_rcu_unlock;
1982 }
1983
1984 /* Setup UST consumer socket and send fds to it */
1985 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1986 if (ret < 0) {
1987 goto error_rcu_unlock;
1988 }
1989 ua_sess->started = 1;
1990
1991 skip_setup:
1992 /* This start the UST tracing */
1993 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1994 if (ret < 0) {
1995 ERR("Error starting tracing for app pid: %d", app->key.pid);
1996 goto error_rcu_unlock;
1997 }
1998
1999 /* Quiescent wait after starting trace */
2000 ustctl_wait_quiescent(app->key.sock);
2001
2002 end:
2003 rcu_read_unlock();
2004 return 0;
2005
2006 error_rcu_unlock:
2007 rcu_read_unlock();
2008 return -1;
2009 }
2010
2011 /*
2012 * Stop tracing for a specific UST session and app.
2013 */
2014 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2015 {
2016 int ret = 0;
2017 struct lttng_ht_iter iter;
2018 struct ust_app_session *ua_sess;
2019 struct ust_app_channel *ua_chan;
2020
2021 DBG("Stopping tracing for ust app pid %d", app->key.pid);
2022
2023 rcu_read_lock();
2024
2025 if (!app->compatible) {
2026 goto end;
2027 }
2028
2029 ua_sess = lookup_session_by_app(usess, app);
2030 if (ua_sess == NULL) {
2031 /* Only malloc can failed so something is really wrong */
2032 goto error_rcu_unlock;
2033 }
2034
2035 /* Not started, continuing. */
2036 if (ua_sess->started == 0) {
2037 goto end;
2038 }
2039
2040 /* This inhibits UST tracing */
2041 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
2042 if (ret < 0) {
2043 ERR("Error stopping tracing for app pid: %d", app->key.pid);
2044 goto error_rcu_unlock;
2045 }
2046
2047 /* Quiescent wait after stopping trace */
2048 ustctl_wait_quiescent(app->key.sock);
2049
2050 /* Flushing buffers */
2051 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2052 node.node) {
2053 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
2054 if (ret < 0) {
2055 ERR("UST app PID %d channel %s flush failed with ret %d",
2056 app->key.pid, ua_chan->name, ret);
2057 /* Continuing flushing all buffers */
2058 continue;
2059 }
2060 }
2061
2062 /* Flush all buffers before stopping */
2063 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
2064 if (ret < 0) {
2065 ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
2066 ret);
2067 }
2068
2069 ua_sess->started = 0;
2070
2071 end:
2072 rcu_read_unlock();
2073 return 0;
2074
2075 error_rcu_unlock:
2076 rcu_read_unlock();
2077 return -1;
2078 }
2079
2080 /*
2081 * Destroy a specific UST session in apps.
2082 */
2083 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2084 {
2085 struct ust_app_session *ua_sess;
2086 struct lttng_ust_object_data obj;
2087 struct lttng_ht_iter iter;
2088 struct lttng_ht_node_ulong *node;
2089 int ret;
2090
2091 DBG("Destroy tracing for ust app pid %d", app->key.pid);
2092
2093 rcu_read_lock();
2094
2095 if (!app->compatible) {
2096 goto end;
2097 }
2098
2099 __lookup_session_by_app(usess, app, &iter);
2100 node = lttng_ht_iter_get_node_ulong(&iter);
2101 if (node == NULL) {
2102 /* Only malloc can failed so something is really wrong */
2103 goto error_rcu_unlock;
2104 }
2105 ua_sess = caa_container_of(node, struct ust_app_session, node);
2106 ret = lttng_ht_del(app->sessions, &iter);
2107 assert(!ret);
2108 obj.handle = ua_sess->handle;
2109 obj.shm_fd = -1;
2110 obj.wait_fd = -1;
2111 obj.memory_map_size = 0;
2112 ustctl_release_object(app->key.sock, &obj);
2113
2114 delete_ust_app_session(app->key.sock, ua_sess);
2115
2116 /* Quiescent wait after stopping trace */
2117 ustctl_wait_quiescent(app->key.sock);
2118
2119 end:
2120 rcu_read_unlock();
2121 return 0;
2122
2123 error_rcu_unlock:
2124 rcu_read_unlock();
2125 return -1;
2126 }
2127
2128 /*
2129 * Start tracing for the UST session.
2130 */
2131 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2132 {
2133 int ret = 0;
2134 struct lttng_ht_iter iter;
2135 struct ust_app *app;
2136
2137 DBG("Starting all UST traces");
2138
2139 rcu_read_lock();
2140
2141 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2142 ret = ust_app_start_trace(usess, app);
2143 if (ret < 0) {
2144 /* Continue to next apps even on error */
2145 continue;
2146 }
2147 }
2148
2149 rcu_read_unlock();
2150
2151 return 0;
2152 }
2153
2154 /*
2155 * Start tracing for the UST session.
2156 */
2157 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2158 {
2159 int ret = 0;
2160 struct lttng_ht_iter iter;
2161 struct ust_app *app;
2162
2163 DBG("Stopping all UST traces");
2164
2165 rcu_read_lock();
2166
2167 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2168 ret = ust_app_stop_trace(usess, app);
2169 if (ret < 0) {
2170 /* Continue to next apps even on error */
2171 continue;
2172 }
2173 }
2174
2175 rcu_read_unlock();
2176
2177 return 0;
2178 }
2179
2180 /*
2181 * Destroy app UST session.
2182 */
2183 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2184 {
2185 int ret = 0;
2186 struct lttng_ht_iter iter;
2187 struct ust_app *app;
2188
2189 DBG("Destroy all UST traces");
2190
2191 rcu_read_lock();
2192
2193 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2194 ret = ust_app_destroy_trace(usess, app);
2195 if (ret < 0) {
2196 /* Continue to next apps even on error */
2197 continue;
2198 }
2199 }
2200
2201 rcu_read_unlock();
2202
2203 return 0;
2204 }
2205
2206 /*
2207 * Add channels/events from UST global domain to registered apps at sock.
2208 */
2209 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2210 {
2211 int ret = 0;
2212 struct lttng_ht_iter iter, uiter, iter_ctx;
2213 struct ust_app *app;
2214 struct ust_app_session *ua_sess;
2215 struct ust_app_channel *ua_chan;
2216 struct ust_app_event *ua_event;
2217 struct ust_app_ctx *ua_ctx;
2218
2219 if (usess == NULL) {
2220 ERR("No UST session on global update. Returning");
2221 goto error;
2222 }
2223
2224 DBG2("UST app global update for app sock %d for session id %d", sock,
2225 usess->id);
2226
2227 rcu_read_lock();
2228
2229 app = find_app_by_sock(sock);
2230 if (app == NULL) {
2231 ERR("Failed to update app sock %d", sock);
2232 goto error;
2233 }
2234
2235 if (!app->compatible) {
2236 goto error;
2237 }
2238
2239 ua_sess = create_ust_app_session(usess, app);
2240 if (ua_sess == NULL) {
2241 goto error;
2242 }
2243
2244 /*
2245 * We can iterate safely here over all UST app session sicne the create ust
2246 * app session above made a shadow copy of the UST global domain from the
2247 * ltt ust session.
2248 */
2249 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2250 node.node) {
2251 ret = create_ust_channel(app, ua_sess, ua_chan);
2252 if (ret < 0) {
2253 /* FIXME: Should we quit here or continue... */
2254 continue;
2255 }
2256
2257 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2258 node.node) {
2259 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2260 if (ret < 0) {
2261 /* FIXME: Should we quit here or continue... */
2262 continue;
2263 }
2264 }
2265
2266
2267 /* For each events */
2268 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2269 node.node) {
2270 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2271 if (ret < 0) {
2272 /* FIXME: Should we quit here or continue... */
2273 continue;
2274 }
2275
2276 /* Add context on events. */
2277 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2278 ua_ctx, node.node) {
2279 ret = create_ust_event_context(ua_event, ua_ctx, app);
2280 if (ret < 0) {
2281 /* FIXME: Should we quit here or continue... */
2282 continue;
2283 }
2284 }
2285 }
2286 }
2287
2288 if (usess->start_trace) {
2289 ret = ust_app_start_trace(usess, app);
2290 if (ret < 0) {
2291 goto error;
2292 }
2293
2294 DBG2("UST trace started for app pid %d", app->key.pid);
2295 }
2296
2297 error:
2298 rcu_read_unlock();
2299 return;
2300 }
2301
2302 /*
2303 * Add context to a specific channel for global UST domain.
2304 */
2305 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2306 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2307 {
2308 int ret = 0;
2309 struct lttng_ht_node_str *ua_chan_node;
2310 struct lttng_ht_iter iter, uiter;
2311 struct ust_app_channel *ua_chan = NULL;
2312 struct ust_app_session *ua_sess;
2313 struct ust_app *app;
2314
2315 rcu_read_lock();
2316
2317 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2318 if (!app->compatible) {
2319 /*
2320 * TODO: In time, we should notice the caller of this error by
2321 * telling him that this is a version error.
2322 */
2323 continue;
2324 }
2325 ua_sess = lookup_session_by_app(usess, app);
2326 if (ua_sess == NULL) {
2327 continue;
2328 }
2329
2330 /* Lookup channel in the ust app session */
2331 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2332 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2333 if (ua_chan_node == NULL) {
2334 continue;
2335 }
2336 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2337 node);
2338
2339 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2340 if (ret < 0) {
2341 continue;
2342 }
2343 }
2344
2345 rcu_read_unlock();
2346 return ret;
2347 }
2348
2349 /*
2350 * Add context to a specific event in a channel for global UST domain.
2351 */
2352 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2353 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2354 struct ltt_ust_context *uctx)
2355 {
2356 int ret = 0;
2357 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2358 struct lttng_ht_iter iter, uiter;
2359 struct ust_app_session *ua_sess;
2360 struct ust_app_event *ua_event;
2361 struct ust_app_channel *ua_chan = NULL;
2362 struct ust_app *app;
2363
2364 rcu_read_lock();
2365
2366 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2367 if (!app->compatible) {
2368 /*
2369 * TODO: In time, we should notice the caller of this error by
2370 * telling him that this is a version error.
2371 */
2372 continue;
2373 }
2374 ua_sess = lookup_session_by_app(usess, app);
2375 if (ua_sess == NULL) {
2376 continue;
2377 }
2378
2379 /* Lookup channel in the ust app session */
2380 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2381 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2382 if (ua_chan_node == NULL) {
2383 continue;
2384 }
2385 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2386 node);
2387
2388 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2389 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2390 if (ua_event_node == NULL) {
2391 continue;
2392 }
2393 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2394 node);
2395
2396 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2397 if (ret < 0) {
2398 continue;
2399 }
2400 }
2401
2402 rcu_read_unlock();
2403 return ret;
2404 }
2405
2406 /*
2407 * Enable event for a channel from a UST session for a specific PID.
2408 */
2409 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2410 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2411 {
2412 int ret = 0;
2413 struct lttng_ht_iter iter;
2414 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2415 struct ust_app *app;
2416 struct ust_app_session *ua_sess;
2417 struct ust_app_channel *ua_chan;
2418 struct ust_app_event *ua_event;
2419
2420 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2421
2422 rcu_read_lock();
2423
2424 app = ust_app_find_by_pid(pid);
2425 if (app == NULL) {
2426 ERR("UST app enable event per PID %d not found", pid);
2427 ret = -1;
2428 goto error;
2429 }
2430
2431 if (!app->compatible) {
2432 ret = 0;
2433 goto error;
2434 }
2435
2436 ua_sess = lookup_session_by_app(usess, app);
2437 /* If ua_sess is NULL, there is a code flow error */
2438 assert(ua_sess);
2439
2440 /* Lookup channel in the ust app session */
2441 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2442 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2443 /* If the channel is not found, there is a code flow error */
2444 assert(ua_chan_node);
2445
2446 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2447
2448 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2449 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2450 if (ua_event_node == NULL) {
2451 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2452 if (ret < 0) {
2453 goto error;
2454 }
2455 } else {
2456 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2457
2458 ret = enable_ust_app_event(ua_sess, ua_event, app);
2459 if (ret < 0) {
2460 goto error;
2461 }
2462 }
2463
2464 error:
2465 rcu_read_unlock();
2466 return ret;
2467 }
2468
2469 /*
2470 * Disable event for a channel from a UST session for a specific PID.
2471 */
2472 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2473 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2474 {
2475 int ret = 0;
2476 struct lttng_ht_iter iter;
2477 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2478 struct ust_app *app;
2479 struct ust_app_session *ua_sess;
2480 struct ust_app_channel *ua_chan;
2481 struct ust_app_event *ua_event;
2482
2483 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2484
2485 rcu_read_lock();
2486
2487 app = ust_app_find_by_pid(pid);
2488 if (app == NULL) {
2489 ERR("UST app disable event per PID %d not found", pid);
2490 ret = -1;
2491 goto error;
2492 }
2493
2494 if (!app->compatible) {
2495 ret = 0;
2496 goto error;
2497 }
2498
2499 ua_sess = lookup_session_by_app(usess, app);
2500 /* If ua_sess is NULL, there is a code flow error */
2501 assert(ua_sess);
2502
2503 /* Lookup channel in the ust app session */
2504 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2505 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2506 if (ua_chan_node == NULL) {
2507 /* Channel does not exist, skip disabling */
2508 goto error;
2509 }
2510 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2511
2512 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2513 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2514 if (ua_event_node == NULL) {
2515 /* Event does not exist, skip disabling */
2516 goto error;
2517 }
2518 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2519
2520 ret = disable_ust_app_event(ua_sess, ua_event, app);
2521 if (ret < 0) {
2522 goto error;
2523 }
2524
2525 error:
2526 rcu_read_unlock();
2527 return ret;
2528 }
2529
2530 /*
2531 * Validate version of UST apps and set the compatible bit.
2532 */
2533 int ust_app_validate_version(int sock)
2534 {
2535 int ret;
2536 struct ust_app *app;
2537
2538 rcu_read_lock();
2539
2540 app = find_app_by_sock(sock);
2541 assert(app);
2542
2543 ret = ustctl_tracer_version(sock, &app->version);
2544 if (ret < 0) {
2545 goto error;
2546 }
2547
2548 /* Validate version */
2549 if (app->version.major > UST_APP_MAJOR_VERSION) {
2550 goto error;
2551 }
2552
2553 DBG2("UST app PID %d is compatible with major version %d "
2554 "(supporting <= %d)", app->key.pid, app->version.major,
2555 UST_APP_MAJOR_VERSION);
2556 app->compatible = 1;
2557 rcu_read_unlock();
2558 return 0;
2559
2560 error:
2561 DBG2("UST app PID %d is not compatible with major version %d "
2562 "(supporting <= %d)", app->key.pid, app->version.major,
2563 UST_APP_MAJOR_VERSION);
2564 app->compatible = 0;
2565 rcu_read_unlock();
2566 return -1;
2567 }
2568
2569 /*
2570 * Calibrate registered applications.
2571 */
2572 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2573 {
2574 int ret = 0;
2575 struct lttng_ht_iter iter;
2576 struct ust_app *app;
2577
2578 rcu_read_lock();
2579
2580 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2581 if (!app->compatible) {
2582 /*
2583 * TODO: In time, we should notice the caller of this error by
2584 * telling him that this is a version error.
2585 */
2586 continue;
2587 }
2588
2589 ret = ustctl_calibrate(app->key.sock, calibrate);
2590 if (ret < 0) {
2591 switch (ret) {
2592 case -ENOSYS:
2593 /* Means that it's not implemented on the tracer side. */
2594 ret = 0;
2595 break;
2596 default:
2597 /* TODO: Report error to user */
2598 DBG2("Calibrate app PID %d returned with error %d",
2599 app->key.pid, ret);
2600 break;
2601 }
2602 }
2603 }
2604
2605 DBG("UST app global domain calibration finished");
2606
2607 rcu_read_unlock();
2608
2609 return ret;
2610 }
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