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