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Fix return value on ust app session create
[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 /* This means that the tracer is gone... */
869 ua_sess = (void*) -1UL;
870 goto error;
871 }
872
873 ua_sess->handle = ret;
874
875 /* Add ust app session to app's HT */
876 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
877 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
878
879 DBG2("UST app session created successfully with handle %d", ret);
880 }
881
882 end:
883 return ua_sess;
884
885 error:
886 delete_ust_app_session(-1, ua_sess);
887 return NULL;
888 }
889
890 /*
891 * Create a context for the channel on the tracer.
892 */
893 static
894 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
895 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
896 struct ust_app *app)
897 {
898 int ret = 0;
899 struct lttng_ht_iter iter;
900 struct lttng_ht_node_ulong *node;
901 struct ust_app_ctx *ua_ctx;
902
903 DBG2("UST app adding context to channel %s", ua_chan->name);
904
905 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
906 node = lttng_ht_iter_get_node_ulong(&iter);
907 if (node != NULL) {
908 ret = -EEXIST;
909 goto error;
910 }
911
912 ua_ctx = alloc_ust_app_ctx(uctx);
913 if (ua_ctx == NULL) {
914 /* malloc failed */
915 ret = -1;
916 goto error;
917 }
918
919 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
920 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
921
922 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
923 if (ret < 0) {
924 goto error;
925 }
926
927 error:
928 return ret;
929 }
930
931 /*
932 * Create an UST context and enable it for the event on the tracer.
933 */
934 static
935 int create_ust_app_event_context(struct ust_app_session *ua_sess,
936 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
937 struct ust_app *app)
938 {
939 int ret = 0;
940 struct lttng_ht_iter iter;
941 struct lttng_ht_node_ulong *node;
942 struct ust_app_ctx *ua_ctx;
943
944 DBG2("UST app adding context to event %s", ua_event->name);
945
946 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
947 node = lttng_ht_iter_get_node_ulong(&iter);
948 if (node != NULL) {
949 ret = -EEXIST;
950 goto error;
951 }
952
953 ua_ctx = alloc_ust_app_ctx(uctx);
954 if (ua_ctx == NULL) {
955 /* malloc failed */
956 ret = -1;
957 goto error;
958 }
959
960 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
961 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
962
963 ret = create_ust_event_context(ua_event, ua_ctx, app);
964 if (ret < 0) {
965 goto error;
966 }
967
968 error:
969 return ret;
970 }
971
972 /*
973 * Enable on the tracer side a ust app event for the session and channel.
974 */
975 static
976 int enable_ust_app_event(struct ust_app_session *ua_sess,
977 struct ust_app_event *ua_event, struct ust_app *app)
978 {
979 int ret;
980
981 ret = enable_ust_event(app, ua_sess, ua_event);
982 if (ret < 0) {
983 goto error;
984 }
985
986 ua_event->enabled = 1;
987
988 error:
989 return ret;
990 }
991
992 /*
993 * Disable on the tracer side a ust app event for the session and channel.
994 */
995 static int disable_ust_app_event(struct ust_app_session *ua_sess,
996 struct ust_app_event *ua_event, struct ust_app *app)
997 {
998 int ret;
999
1000 ret = disable_ust_event(app, ua_sess, ua_event);
1001 if (ret < 0) {
1002 goto error;
1003 }
1004
1005 ua_event->enabled = 0;
1006
1007 error:
1008 return ret;
1009 }
1010
1011 /*
1012 * Lookup ust app channel for session and disable it on the tracer side.
1013 */
1014 static
1015 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1016 struct ust_app_channel *ua_chan, struct ust_app *app)
1017 {
1018 int ret;
1019
1020 ret = disable_ust_channel(app, ua_sess, ua_chan);
1021 if (ret < 0) {
1022 goto error;
1023 }
1024
1025 ua_chan->enabled = 0;
1026
1027 error:
1028 return ret;
1029 }
1030
1031 /*
1032 * Lookup ust app channel for session and enable it on the tracer side.
1033 */
1034 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1035 struct ltt_ust_channel *uchan, struct ust_app *app)
1036 {
1037 int ret = 0;
1038 struct lttng_ht_iter iter;
1039 struct lttng_ht_node_str *ua_chan_node;
1040 struct ust_app_channel *ua_chan;
1041
1042 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1043 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1044 if (ua_chan_node == NULL) {
1045 DBG2("Unable to find channel %s in ust session id %u",
1046 uchan->name, ua_sess->id);
1047 goto error;
1048 }
1049
1050 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1051
1052 ret = enable_ust_channel(app, ua_sess, ua_chan);
1053 if (ret < 0) {
1054 goto error;
1055 }
1056
1057 error:
1058 return ret;
1059 }
1060
1061 /*
1062 * Create UST app channel and create it on the tracer.
1063 */
1064 static struct ust_app_channel *create_ust_app_channel(
1065 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1066 struct ust_app *app)
1067 {
1068 int ret = 0;
1069 struct lttng_ht_iter iter;
1070 struct lttng_ht_node_str *ua_chan_node;
1071 struct ust_app_channel *ua_chan;
1072
1073 /* Lookup channel in the ust app session */
1074 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1075 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1076 if (ua_chan_node != NULL) {
1077 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1078 goto end;
1079 }
1080
1081 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1082 if (ua_chan == NULL) {
1083 /* Only malloc can fail here */
1084 goto error;
1085 }
1086 shadow_copy_channel(ua_chan, uchan);
1087
1088 ret = create_ust_channel(app, ua_sess, ua_chan);
1089 if (ret < 0) {
1090 /* Not found previously means that it does not exist on the tracer */
1091 assert(ret != -EEXIST);
1092 goto error;
1093 }
1094
1095 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1096
1097 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1098 app->key.pid);
1099
1100 end:
1101 return ua_chan;
1102
1103 error:
1104 delete_ust_app_channel(-1, ua_chan);
1105 return NULL;
1106 }
1107
1108 /*
1109 * Create UST app event and create it on the tracer side.
1110 */
1111 static
1112 int create_ust_app_event(struct ust_app_session *ua_sess,
1113 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1114 struct ust_app *app)
1115 {
1116 int ret = 0;
1117 struct lttng_ht_iter iter;
1118 struct lttng_ht_node_str *ua_event_node;
1119 struct ust_app_event *ua_event;
1120
1121 /* Get event node */
1122 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1123 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1124 if (ua_event_node != NULL) {
1125 ret = -EEXIST;
1126 goto end;
1127 }
1128
1129 /* Does not exist so create one */
1130 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1131 if (ua_event == NULL) {
1132 /* Only malloc can failed so something is really wrong */
1133 ret = -ENOMEM;
1134 goto end;
1135 }
1136 shadow_copy_event(ua_event, uevent);
1137
1138 /* Create it on the tracer side */
1139 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1140 if (ret < 0) {
1141 /* Not found previously means that it does not exist on the tracer */
1142 assert(ret != -EEXIST);
1143 goto error;
1144 }
1145
1146 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1147
1148 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1149 app->key.pid);
1150
1151 end:
1152 return ret;
1153
1154 error:
1155 /* Valid. Calling here is already in a read side lock */
1156 delete_ust_app_event(-1, ua_event);
1157 return ret;
1158 }
1159
1160 /*
1161 * Create UST metadata and open it on the tracer side.
1162 */
1163 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1164 char *pathname, struct ust_app *app)
1165 {
1166 int ret = 0;
1167
1168 if (ua_sess->metadata == NULL) {
1169 /* Allocate UST metadata */
1170 ua_sess->metadata = trace_ust_create_metadata(pathname);
1171 if (ua_sess->metadata == NULL) {
1172 /* malloc() failed */
1173 goto error;
1174 }
1175
1176 ret = open_ust_metadata(app, ua_sess);
1177 if (ret < 0) {
1178 DBG3("Opening metadata failed. Cleaning up memory");
1179
1180 /* Cleanup failed metadata struct */
1181 free(ua_sess->metadata);
1182 /*
1183 * This is very important because delete_ust_app_session check if
1184 * the pointer is null or not in order to delete the metadata.
1185 */
1186 ua_sess->metadata = NULL;
1187 goto error;
1188 }
1189
1190 DBG2("UST metadata opened for app pid %d", app->key.pid);
1191 }
1192
1193 /* Open UST metadata stream */
1194 if (ua_sess->metadata->stream_obj == NULL) {
1195 ret = create_ust_stream(app, ua_sess);
1196 if (ret < 0) {
1197 goto error;
1198 }
1199
1200 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
1201 ua_sess->uid, ua_sess->gid);
1202 if (ret < 0) {
1203 PERROR("mkdir UST metadata");
1204 goto error;
1205 }
1206
1207 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1208 "%s/metadata", ua_sess->path);
1209 if (ret < 0) {
1210 PERROR("asprintf UST create stream");
1211 goto error;
1212 }
1213
1214 DBG2("UST metadata stream object created for app pid %d",
1215 app->key.pid);
1216 } else {
1217 ERR("Attempting to create stream without metadata opened");
1218 goto error;
1219 }
1220
1221 return 0;
1222
1223 error:
1224 return -1;
1225 }
1226
1227 /*
1228 * Return pointer to traceable apps list.
1229 */
1230 struct lttng_ht *ust_app_get_ht(void)
1231 {
1232 return ust_app_ht;
1233 }
1234
1235 /*
1236 * Return ust app pointer or NULL if not found.
1237 */
1238 struct ust_app *ust_app_find_by_pid(pid_t pid)
1239 {
1240 struct lttng_ht_node_ulong *node;
1241 struct lttng_ht_iter iter;
1242
1243 rcu_read_lock();
1244 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1245 node = lttng_ht_iter_get_node_ulong(&iter);
1246 if (node == NULL) {
1247 DBG2("UST app no found with pid %d", pid);
1248 goto error;
1249 }
1250 rcu_read_unlock();
1251
1252 DBG2("Found UST app by pid %d", pid);
1253
1254 return caa_container_of(node, struct ust_app, node);
1255
1256 error:
1257 rcu_read_unlock();
1258 return NULL;
1259 }
1260
1261 /*
1262 * Using pid and uid (of the app), allocate a new ust_app struct and
1263 * add it to the global traceable app list.
1264 *
1265 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1266 * bitness is not supported.
1267 */
1268 int ust_app_register(struct ust_register_msg *msg, int sock)
1269 {
1270 struct ust_app *lta;
1271
1272 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1273 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1274 ERR("Registration failed: application \"%s\" (pid: %d) has "
1275 "%d-bit long, but no consumerd for this long size is available.\n",
1276 msg->name, msg->pid, msg->bits_per_long);
1277 close(sock);
1278 return -EINVAL;
1279 }
1280 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1281 ERR("Registration failed: application \"%s\" (pid: %d) has "
1282 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1283 msg->name, msg->pid, msg->major, msg->minor);
1284 close(sock);
1285 return -EINVAL;
1286 }
1287 lta = zmalloc(sizeof(struct ust_app));
1288 if (lta == NULL) {
1289 PERROR("malloc");
1290 return -ENOMEM;
1291 }
1292
1293 lta->ppid = msg->ppid;
1294 lta->uid = msg->uid;
1295 lta->gid = msg->gid;
1296 lta->compatible = 0; /* Not compatible until proven */
1297 lta->bits_per_long = msg->bits_per_long;
1298 lta->v_major = msg->major;
1299 lta->v_minor = msg->minor;
1300 strncpy(lta->name, msg->name, sizeof(lta->name));
1301 lta->name[16] = '\0';
1302 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1303
1304 /* Set key map */
1305 lta->key.pid = msg->pid;
1306 lttng_ht_node_init_ulong(&lta->node, (unsigned long)lta->key.pid);
1307 lta->key.sock = sock;
1308 lttng_ht_node_init_ulong(&lta->key.node, (unsigned long)lta->key.sock);
1309
1310 rcu_read_lock();
1311 lttng_ht_add_unique_ulong(ust_app_sock_key_map, &lta->key.node);
1312 lttng_ht_add_unique_ulong(ust_app_ht, &lta->node);
1313 rcu_read_unlock();
1314
1315 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1316 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1317 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1318
1319 return 0;
1320 }
1321
1322 /*
1323 * Unregister app by removing it from the global traceable app list and freeing
1324 * the data struct.
1325 *
1326 * The socket is already closed at this point so no close to sock.
1327 */
1328 void ust_app_unregister(int sock)
1329 {
1330 struct ust_app *lta;
1331 struct lttng_ht_node_ulong *node;
1332 struct lttng_ht_iter iter;
1333 int ret;
1334
1335 rcu_read_lock();
1336 lta = find_app_by_sock(sock);
1337 if (lta == NULL) {
1338 ERR("Unregister app sock %d not found!", sock);
1339 goto error;
1340 }
1341
1342 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1343
1344 /* Remove application from socket hash table */
1345 lttng_ht_lookup(ust_app_sock_key_map, (void *)((unsigned long) sock), &iter);
1346 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1347 assert(!ret);
1348
1349 /* Get the node reference for a call_rcu */
1350 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) lta->key.pid), &iter);
1351 node = lttng_ht_iter_get_node_ulong(&iter);
1352 if (node == NULL) {
1353 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1354 goto error;
1355 }
1356
1357 /* Remove application from PID hash table */
1358 ret = lttng_ht_del(ust_app_ht, &iter);
1359 assert(!ret);
1360 call_rcu(&node->head, delete_ust_app_rcu);
1361 error:
1362 rcu_read_unlock();
1363 return;
1364 }
1365
1366 /*
1367 * Return traceable_app_count
1368 */
1369 unsigned long ust_app_list_count(void)
1370 {
1371 unsigned long count;
1372
1373 rcu_read_lock();
1374 count = lttng_ht_get_count(ust_app_ht);
1375 rcu_read_unlock();
1376
1377 return count;
1378 }
1379
1380 /*
1381 * Fill events array with all events name of all registered apps.
1382 */
1383 int ust_app_list_events(struct lttng_event **events)
1384 {
1385 int ret, handle;
1386 size_t nbmem, count = 0;
1387 struct lttng_ht_iter iter;
1388 struct ust_app *app;
1389 struct lttng_event *tmp;
1390
1391 nbmem = UST_APP_EVENT_LIST_SIZE;
1392 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1393 if (tmp == NULL) {
1394 PERROR("zmalloc ust app events");
1395 ret = -ENOMEM;
1396 goto error;
1397 }
1398
1399 rcu_read_lock();
1400
1401 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1402 struct lttng_ust_tracepoint_iter uiter;
1403
1404 if (!app->compatible) {
1405 /*
1406 * TODO: In time, we should notice the caller of this error by
1407 * telling him that this is a version error.
1408 */
1409 continue;
1410 }
1411 handle = ustctl_tracepoint_list(app->key.sock);
1412 if (handle < 0) {
1413 ERR("UST app list events getting handle failed for app pid %d",
1414 app->key.pid);
1415 continue;
1416 }
1417
1418 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1419 &uiter)) != -ENOENT) {
1420 if (count >= nbmem) {
1421 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1422 2 * nbmem);
1423 nbmem *= 2;
1424 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1425 if (tmp == NULL) {
1426 PERROR("realloc ust app events");
1427 ret = -ENOMEM;
1428 goto rcu_error;
1429 }
1430 }
1431 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1432 tmp[count].loglevel = uiter.loglevel;
1433 tmp[count].type = LTTNG_UST_TRACEPOINT;
1434 tmp[count].pid = app->key.pid;
1435 tmp[count].enabled = -1;
1436 count++;
1437 }
1438 }
1439
1440 ret = count;
1441 *events = tmp;
1442
1443 DBG2("UST app list events done (%zu events)", count);
1444
1445 rcu_error:
1446 rcu_read_unlock();
1447 error:
1448 return ret;
1449 }
1450
1451 /*
1452 * Free and clean all traceable apps of the global list.
1453 */
1454 void ust_app_clean_list(void)
1455 {
1456 int ret;
1457 struct lttng_ht_iter iter;
1458 struct lttng_ht_node_ulong *node;
1459
1460 DBG2("UST app cleaning registered apps hash table");
1461
1462 rcu_read_lock();
1463
1464 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1465 ret = lttng_ht_del(ust_app_ht, &iter);
1466 assert(!ret);
1467 call_rcu(&node->head, delete_ust_app_rcu);
1468 }
1469 /* Destroy is done only when the ht is empty */
1470 lttng_ht_destroy(ust_app_ht);
1471
1472 cds_lfht_for_each_entry(ust_app_sock_key_map->ht, &iter.iter, node, node) {
1473 ret = lttng_ht_del(ust_app_sock_key_map, &iter);
1474 assert(!ret);
1475 }
1476 /* Destroy is done only when the ht is empty */
1477 lttng_ht_destroy(ust_app_sock_key_map);
1478
1479 rcu_read_unlock();
1480 }
1481
1482 /*
1483 * Init UST app hash table.
1484 */
1485 void ust_app_ht_alloc(void)
1486 {
1487 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1488 ust_app_sock_key_map = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1489 }
1490
1491 /*
1492 * For a specific UST session, disable the channel for all registered apps.
1493 */
1494 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1495 struct ltt_ust_channel *uchan)
1496 {
1497 int ret = 0;
1498 struct lttng_ht_iter iter;
1499 struct lttng_ht_node_str *ua_chan_node;
1500 struct ust_app *app;
1501 struct ust_app_session *ua_sess;
1502 struct ust_app_channel *ua_chan;
1503
1504 if (usess == NULL || uchan == NULL) {
1505 ERR("Disabling UST global channel with NULL values");
1506 ret = -1;
1507 goto error;
1508 }
1509
1510 DBG2("UST app disabling channel %s from global domain for session id %d",
1511 uchan->name, usess->id);
1512
1513 rcu_read_lock();
1514
1515 /* For every registered applications */
1516 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1517 struct lttng_ht_iter uiter;
1518 if (!app->compatible) {
1519 /*
1520 * TODO: In time, we should notice the caller of this error by
1521 * telling him that this is a version error.
1522 */
1523 continue;
1524 }
1525 ua_sess = lookup_session_by_app(usess, app);
1526 if (ua_sess == NULL) {
1527 continue;
1528 }
1529
1530 /* Get channel */
1531 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1532 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1533 /* If the session if found for the app, the channel must be there */
1534 assert(ua_chan_node);
1535
1536 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1537 /* The channel must not be already disabled */
1538 assert(ua_chan->enabled == 1);
1539
1540 /* Disable channel onto application */
1541 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1542 if (ret < 0) {
1543 /* XXX: We might want to report this error at some point... */
1544 continue;
1545 }
1546 }
1547
1548 rcu_read_unlock();
1549
1550 error:
1551 return ret;
1552 }
1553
1554 /*
1555 * For a specific UST session, enable the channel for all registered apps.
1556 */
1557 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1558 struct ltt_ust_channel *uchan)
1559 {
1560 int ret = 0;
1561 struct lttng_ht_iter iter;
1562 struct ust_app *app;
1563 struct ust_app_session *ua_sess;
1564
1565 if (usess == NULL || uchan == NULL) {
1566 ERR("Adding UST global channel to NULL values");
1567 ret = -1;
1568 goto error;
1569 }
1570
1571 DBG2("UST app enabling channel %s to global domain for session id %d",
1572 uchan->name, usess->id);
1573
1574 rcu_read_lock();
1575
1576 /* For every registered applications */
1577 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1578 if (!app->compatible) {
1579 /*
1580 * TODO: In time, we should notice the caller of this error by
1581 * telling him that this is a version error.
1582 */
1583 continue;
1584 }
1585 ua_sess = lookup_session_by_app(usess, app);
1586 if (ua_sess == NULL) {
1587 continue;
1588 }
1589
1590 /* Enable channel onto application */
1591 ret = enable_ust_app_channel(ua_sess, uchan, app);
1592 if (ret < 0) {
1593 /* XXX: We might want to report this error at some point... */
1594 continue;
1595 }
1596 }
1597
1598 rcu_read_unlock();
1599
1600 error:
1601 return ret;
1602 }
1603
1604 /*
1605 * Disable an event in a channel and for a specific session.
1606 */
1607 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1608 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1609 {
1610 int ret = 0;
1611 struct lttng_ht_iter iter, uiter;
1612 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1613 struct ust_app *app;
1614 struct ust_app_session *ua_sess;
1615 struct ust_app_channel *ua_chan;
1616 struct ust_app_event *ua_event;
1617
1618 DBG("UST app disabling event %s for all apps in channel "
1619 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1620
1621 rcu_read_lock();
1622
1623 /* For all registered applications */
1624 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1625 if (!app->compatible) {
1626 /*
1627 * TODO: In time, we should notice the caller of this error by
1628 * telling him that this is a version error.
1629 */
1630 continue;
1631 }
1632 ua_sess = lookup_session_by_app(usess, app);
1633 if (ua_sess == NULL) {
1634 /* Next app */
1635 continue;
1636 }
1637
1638 /* Lookup channel in the ust app session */
1639 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1640 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1641 if (ua_chan_node == NULL) {
1642 DBG2("Channel %s not found in session id %d for app pid %d."
1643 "Skipping", uchan->name, usess->id, app->key.pid);
1644 continue;
1645 }
1646 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1647
1648 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1649 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1650 if (ua_event_node == NULL) {
1651 DBG2("Event %s not found in channel %s for app pid %d."
1652 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1653 continue;
1654 }
1655 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1656
1657 ret = disable_ust_app_event(ua_sess, ua_event, app);
1658 if (ret < 0) {
1659 /* XXX: Report error someday... */
1660 continue;
1661 }
1662 }
1663
1664 rcu_read_unlock();
1665
1666 return ret;
1667 }
1668
1669 /*
1670 * For a specific UST session and UST channel, the event for all
1671 * registered apps.
1672 */
1673 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1674 struct ltt_ust_channel *uchan)
1675 {
1676 int ret = 0;
1677 struct lttng_ht_iter iter, uiter;
1678 struct lttng_ht_node_str *ua_chan_node;
1679 struct ust_app *app;
1680 struct ust_app_session *ua_sess;
1681 struct ust_app_channel *ua_chan;
1682 struct ust_app_event *ua_event;
1683
1684 DBG("UST app disabling all event for all apps in channel "
1685 "%s for session id %d", uchan->name, usess->id);
1686
1687 rcu_read_lock();
1688
1689 /* For all registered applications */
1690 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1691 if (!app->compatible) {
1692 /*
1693 * TODO: In time, we should notice the caller of this error by
1694 * telling him that this is a version error.
1695 */
1696 continue;
1697 }
1698 ua_sess = lookup_session_by_app(usess, app);
1699 /* If ua_sess is NULL, there is a code flow error */
1700 assert(ua_sess);
1701
1702 /* Lookup channel in the ust app session */
1703 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1704 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1705 /* If the channel is not found, there is a code flow error */
1706 assert(ua_chan_node);
1707
1708 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1709
1710 /* Disable each events of channel */
1711 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1712 node.node) {
1713 ret = disable_ust_app_event(ua_sess, ua_event, app);
1714 if (ret < 0) {
1715 /* XXX: Report error someday... */
1716 continue;
1717 }
1718 }
1719 }
1720
1721 rcu_read_unlock();
1722
1723 return ret;
1724 }
1725
1726 /*
1727 * For a specific UST session, create the channel for all registered apps.
1728 */
1729 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1730 struct ltt_ust_channel *uchan)
1731 {
1732 struct lttng_ht_iter iter;
1733 struct ust_app *app;
1734 struct ust_app_session *ua_sess;
1735 struct ust_app_channel *ua_chan;
1736
1737 /* Very wrong code flow */
1738 assert(usess);
1739 assert(uchan);
1740
1741 DBG2("UST app adding channel %s to global domain for session id %d",
1742 uchan->name, usess->id);
1743
1744 rcu_read_lock();
1745
1746 /* For every registered applications */
1747 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1748 if (!app->compatible) {
1749 /*
1750 * TODO: In time, we should notice the caller of this error by
1751 * telling him that this is a version error.
1752 */
1753 continue;
1754 }
1755 /*
1756 * Create session on the tracer side and add it to app session HT. Note
1757 * that if session exist, it will simply return a pointer to the ust
1758 * app session.
1759 */
1760 ua_sess = create_ust_app_session(usess, app);
1761 if (ua_sess == NULL) {
1762 /* The malloc() failed. */
1763 goto error;
1764 } else if (ua_sess == (void *) -1UL) {
1765 /* The application's socket is not valid. Contiuing */
1766 continue;
1767 }
1768
1769 /* Create channel onto application */
1770 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1771 if (ua_chan == NULL) {
1772 /* Major problem here and it's maybe the tracer or malloc() */
1773 goto error;
1774 }
1775 }
1776
1777 rcu_read_unlock();
1778
1779 return 0;
1780
1781 error:
1782 return -1;
1783 }
1784
1785 /*
1786 * Enable event for a specific session and channel on the tracer.
1787 */
1788 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1789 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1790 {
1791 int ret = 0;
1792 struct lttng_ht_iter iter, uiter;
1793 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1794 struct ust_app *app;
1795 struct ust_app_session *ua_sess;
1796 struct ust_app_channel *ua_chan;
1797 struct ust_app_event *ua_event;
1798
1799 DBG("UST app enabling event %s for all apps for session id %d",
1800 uevent->attr.name, usess->id);
1801
1802 /*
1803 * NOTE: At this point, this function is called only if the session and
1804 * channel passed are already created for all apps. and enabled on the
1805 * tracer also.
1806 */
1807
1808 rcu_read_lock();
1809
1810 /* For all registered applications */
1811 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1812 if (!app->compatible) {
1813 /*
1814 * TODO: In time, we should notice the caller of this error by
1815 * telling him that this is a version error.
1816 */
1817 continue;
1818 }
1819 ua_sess = lookup_session_by_app(usess, app);
1820 /* If ua_sess is NULL, there is a code flow error */
1821 assert(ua_sess);
1822
1823 /* Lookup channel in the ust app session */
1824 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1825 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1826 /* If the channel is not found, there is a code flow error */
1827 assert(ua_chan_node);
1828
1829 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1830
1831 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1832 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1833 if (ua_event_node == NULL) {
1834 DBG3("UST app enable event %s not found for app PID %d."
1835 "Skipping app", uevent->attr.name, app->key.pid);
1836 continue;
1837 }
1838 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1839
1840 ret = enable_ust_app_event(ua_sess, ua_event, app);
1841 if (ret < 0) {
1842 goto error;
1843 }
1844 }
1845
1846 error:
1847 rcu_read_unlock();
1848 return ret;
1849 }
1850
1851 /*
1852 * For a specific existing UST session and UST channel, creates the event for
1853 * all registered apps.
1854 */
1855 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1856 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1857 {
1858 int ret = 0;
1859 struct lttng_ht_iter iter, uiter;
1860 struct lttng_ht_node_str *ua_chan_node;
1861 struct ust_app *app;
1862 struct ust_app_session *ua_sess;
1863 struct ust_app_channel *ua_chan;
1864
1865 DBG("UST app creating event %s for all apps for session id %d",
1866 uevent->attr.name, usess->id);
1867
1868 rcu_read_lock();
1869
1870 /* For all registered applications */
1871 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
1872 if (!app->compatible) {
1873 /*
1874 * TODO: In time, we should notice the caller of this error by
1875 * telling him that this is a version error.
1876 */
1877 continue;
1878 }
1879 ua_sess = lookup_session_by_app(usess, app);
1880 /* If ua_sess is NULL, there is a code flow error */
1881 assert(ua_sess);
1882
1883 /* Lookup channel in the ust app session */
1884 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1885 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1886 /* If the channel is not found, there is a code flow error */
1887 assert(ua_chan_node);
1888
1889 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1890
1891 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1892 if (ret < 0) {
1893 if (ret != -EEXIST) {
1894 /* Possible value at this point: -ENOMEM. If so, we stop! */
1895 break;
1896 }
1897 DBG2("UST app event %s already exist on app PID %d",
1898 uevent->attr.name, app->key.pid);
1899 continue;
1900 }
1901 }
1902
1903 rcu_read_unlock();
1904
1905 return ret;
1906 }
1907
1908 /*
1909 * Start tracing for a specific UST session and app.
1910 */
1911 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1912 {
1913 int ret = 0;
1914 struct lttng_ht_iter iter;
1915 struct ust_app_session *ua_sess;
1916 struct ust_app_channel *ua_chan;
1917 struct ltt_ust_stream *ustream;
1918 int consumerd_fd;
1919
1920 DBG("Starting tracing for ust app pid %d", app->key.pid);
1921
1922 rcu_read_lock();
1923
1924 if (!app->compatible) {
1925 goto end;
1926 }
1927
1928 ua_sess = lookup_session_by_app(usess, app);
1929 if (ua_sess == NULL) {
1930 goto error_rcu_unlock;
1931 }
1932
1933 /* Upon restart, we skip the setup, already done */
1934 if (ua_sess->started) {
1935 goto skip_setup;
1936 }
1937
1938 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1939 if (ret < 0) {
1940 goto error_rcu_unlock;
1941 }
1942
1943 /* For each channel */
1944 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1945 node.node) {
1946 /* Create all streams */
1947 while (1) {
1948 /* Create UST stream */
1949 ustream = zmalloc(sizeof(*ustream));
1950 if (ustream == NULL) {
1951 PERROR("zmalloc ust stream");
1952 goto error_rcu_unlock;
1953 }
1954
1955 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1956 &ustream->obj);
1957 if (ret < 0) {
1958 /* Got all streams */
1959 break;
1960 }
1961 ustream->handle = ustream->obj->handle;
1962
1963 /* Order is important */
1964 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1965 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1966 ua_sess->path, ua_chan->name,
1967 ua_chan->streams.count++);
1968 if (ret < 0) {
1969 PERROR("asprintf UST create stream");
1970 continue;
1971 }
1972 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1973 ustream->pathname);
1974 }
1975 }
1976
1977 switch (app->bits_per_long) {
1978 case 64:
1979 consumerd_fd = ust_consumerd64_fd;
1980 break;
1981 case 32:
1982 consumerd_fd = ust_consumerd32_fd;
1983 break;
1984 default:
1985 ret = -EINVAL;
1986 goto error_rcu_unlock;
1987 }
1988
1989 /* Setup UST consumer socket and send fds to it */
1990 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1991 if (ret < 0) {
1992 goto error_rcu_unlock;
1993 }
1994 ua_sess->started = 1;
1995
1996 skip_setup:
1997 /* This start the UST tracing */
1998 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1999 if (ret < 0) {
2000 ERR("Error starting tracing for app pid: %d", app->key.pid);
2001 goto error_rcu_unlock;
2002 }
2003
2004 /* Quiescent wait after starting trace */
2005 ustctl_wait_quiescent(app->key.sock);
2006
2007 end:
2008 rcu_read_unlock();
2009 return 0;
2010
2011 error_rcu_unlock:
2012 rcu_read_unlock();
2013 return -1;
2014 }
2015
2016 /*
2017 * Stop tracing for a specific UST session and app.
2018 */
2019 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2020 {
2021 int ret = 0;
2022 struct lttng_ht_iter iter;
2023 struct ust_app_session *ua_sess;
2024 struct ust_app_channel *ua_chan;
2025
2026 DBG("Stopping tracing for ust app pid %d", app->key.pid);
2027
2028 rcu_read_lock();
2029
2030 if (!app->compatible) {
2031 goto end;
2032 }
2033
2034 ua_sess = lookup_session_by_app(usess, app);
2035 if (ua_sess == NULL) {
2036 /* Only malloc can failed so something is really wrong */
2037 goto error_rcu_unlock;
2038 }
2039
2040 /* Not started, continuing. */
2041 if (ua_sess->started == 0) {
2042 goto end;
2043 }
2044
2045 /* This inhibits UST tracing */
2046 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
2047 if (ret < 0) {
2048 ERR("Error stopping tracing for app pid: %d", app->key.pid);
2049 goto error_rcu_unlock;
2050 }
2051
2052 /* Quiescent wait after stopping trace */
2053 ustctl_wait_quiescent(app->key.sock);
2054
2055 /* Flushing buffers */
2056 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2057 node.node) {
2058 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
2059 if (ret < 0) {
2060 ERR("UST app PID %d channel %s flush failed with ret %d",
2061 app->key.pid, ua_chan->name, ret);
2062 /* Continuing flushing all buffers */
2063 continue;
2064 }
2065 }
2066
2067 /* Flush all buffers before stopping */
2068 ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
2069 if (ret < 0) {
2070 ERR("UST app PID %d metadata flush failed with ret %d", app->key.pid,
2071 ret);
2072 }
2073
2074 ua_sess->started = 0;
2075
2076 end:
2077 rcu_read_unlock();
2078 return 0;
2079
2080 error_rcu_unlock:
2081 rcu_read_unlock();
2082 return -1;
2083 }
2084
2085 /*
2086 * Destroy a specific UST session in apps.
2087 */
2088 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2089 {
2090 struct ust_app_session *ua_sess;
2091 struct lttng_ust_object_data obj;
2092 struct lttng_ht_iter iter;
2093 struct lttng_ht_node_ulong *node;
2094 int ret;
2095
2096 DBG("Destroy tracing for ust app pid %d", app->key.pid);
2097
2098 rcu_read_lock();
2099
2100 if (!app->compatible) {
2101 goto end;
2102 }
2103
2104 __lookup_session_by_app(usess, app, &iter);
2105 node = lttng_ht_iter_get_node_ulong(&iter);
2106 if (node == NULL) {
2107 /* Only malloc can failed so something is really wrong */
2108 goto error_rcu_unlock;
2109 }
2110 ua_sess = caa_container_of(node, struct ust_app_session, node);
2111 ret = lttng_ht_del(app->sessions, &iter);
2112 assert(!ret);
2113 obj.handle = ua_sess->handle;
2114 obj.shm_fd = -1;
2115 obj.wait_fd = -1;
2116 obj.memory_map_size = 0;
2117 ustctl_release_object(app->key.sock, &obj);
2118
2119 delete_ust_app_session(app->key.sock, ua_sess);
2120
2121 /* Quiescent wait after stopping trace */
2122 ustctl_wait_quiescent(app->key.sock);
2123
2124 end:
2125 rcu_read_unlock();
2126 return 0;
2127
2128 error_rcu_unlock:
2129 rcu_read_unlock();
2130 return -1;
2131 }
2132
2133 /*
2134 * Start tracing for the UST session.
2135 */
2136 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2137 {
2138 int ret = 0;
2139 struct lttng_ht_iter iter;
2140 struct ust_app *app;
2141
2142 DBG("Starting all UST traces");
2143
2144 rcu_read_lock();
2145
2146 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2147 ret = ust_app_start_trace(usess, app);
2148 if (ret < 0) {
2149 /* Continue to next apps even on error */
2150 continue;
2151 }
2152 }
2153
2154 rcu_read_unlock();
2155
2156 return 0;
2157 }
2158
2159 /*
2160 * Start tracing for the UST session.
2161 */
2162 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2163 {
2164 int ret = 0;
2165 struct lttng_ht_iter iter;
2166 struct ust_app *app;
2167
2168 DBG("Stopping all UST traces");
2169
2170 rcu_read_lock();
2171
2172 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2173 ret = ust_app_stop_trace(usess, app);
2174 if (ret < 0) {
2175 /* Continue to next apps even on error */
2176 continue;
2177 }
2178 }
2179
2180 rcu_read_unlock();
2181
2182 return 0;
2183 }
2184
2185 /*
2186 * Destroy app UST session.
2187 */
2188 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2189 {
2190 int ret = 0;
2191 struct lttng_ht_iter iter;
2192 struct ust_app *app;
2193
2194 DBG("Destroy all UST traces");
2195
2196 rcu_read_lock();
2197
2198 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2199 ret = ust_app_destroy_trace(usess, app);
2200 if (ret < 0) {
2201 /* Continue to next apps even on error */
2202 continue;
2203 }
2204 }
2205
2206 rcu_read_unlock();
2207
2208 return 0;
2209 }
2210
2211 /*
2212 * Add channels/events from UST global domain to registered apps at sock.
2213 */
2214 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2215 {
2216 int ret = 0;
2217 struct lttng_ht_iter iter, uiter, iter_ctx;
2218 struct ust_app *app;
2219 struct ust_app_session *ua_sess;
2220 struct ust_app_channel *ua_chan;
2221 struct ust_app_event *ua_event;
2222 struct ust_app_ctx *ua_ctx;
2223
2224 if (usess == NULL) {
2225 ERR("No UST session on global update. Returning");
2226 goto error;
2227 }
2228
2229 DBG2("UST app global update for app sock %d for session id %d", sock,
2230 usess->id);
2231
2232 rcu_read_lock();
2233
2234 app = find_app_by_sock(sock);
2235 if (app == NULL) {
2236 ERR("Failed to update app sock %d", sock);
2237 goto error;
2238 }
2239
2240 if (!app->compatible) {
2241 goto error;
2242 }
2243
2244 ua_sess = create_ust_app_session(usess, app);
2245 if (ua_sess == NULL) {
2246 goto error;
2247 }
2248
2249 /*
2250 * We can iterate safely here over all UST app session sicne the create ust
2251 * app session above made a shadow copy of the UST global domain from the
2252 * ltt ust session.
2253 */
2254 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2255 node.node) {
2256 ret = create_ust_channel(app, ua_sess, ua_chan);
2257 if (ret < 0) {
2258 /* FIXME: Should we quit here or continue... */
2259 continue;
2260 }
2261
2262 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2263 node.node) {
2264 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2265 if (ret < 0) {
2266 /* FIXME: Should we quit here or continue... */
2267 continue;
2268 }
2269 }
2270
2271
2272 /* For each events */
2273 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2274 node.node) {
2275 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2276 if (ret < 0) {
2277 /* FIXME: Should we quit here or continue... */
2278 continue;
2279 }
2280
2281 /* Add context on events. */
2282 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2283 ua_ctx, node.node) {
2284 ret = create_ust_event_context(ua_event, ua_ctx, app);
2285 if (ret < 0) {
2286 /* FIXME: Should we quit here or continue... */
2287 continue;
2288 }
2289 }
2290 }
2291 }
2292
2293 if (usess->start_trace) {
2294 ret = ust_app_start_trace(usess, app);
2295 if (ret < 0) {
2296 goto error;
2297 }
2298
2299 DBG2("UST trace started for app pid %d", app->key.pid);
2300 }
2301
2302 error:
2303 rcu_read_unlock();
2304 return;
2305 }
2306
2307 /*
2308 * Add context to a specific channel for global UST domain.
2309 */
2310 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2311 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2312 {
2313 int ret = 0;
2314 struct lttng_ht_node_str *ua_chan_node;
2315 struct lttng_ht_iter iter, uiter;
2316 struct ust_app_channel *ua_chan = NULL;
2317 struct ust_app_session *ua_sess;
2318 struct ust_app *app;
2319
2320 rcu_read_lock();
2321
2322 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2323 if (!app->compatible) {
2324 /*
2325 * TODO: In time, we should notice the caller of this error by
2326 * telling him that this is a version error.
2327 */
2328 continue;
2329 }
2330 ua_sess = lookup_session_by_app(usess, app);
2331 if (ua_sess == NULL) {
2332 continue;
2333 }
2334
2335 /* Lookup channel in the ust app session */
2336 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2337 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2338 if (ua_chan_node == NULL) {
2339 continue;
2340 }
2341 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2342 node);
2343
2344 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2345 if (ret < 0) {
2346 continue;
2347 }
2348 }
2349
2350 rcu_read_unlock();
2351 return ret;
2352 }
2353
2354 /*
2355 * Add context to a specific event in a channel for global UST domain.
2356 */
2357 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2358 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2359 struct ltt_ust_context *uctx)
2360 {
2361 int ret = 0;
2362 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2363 struct lttng_ht_iter iter, uiter;
2364 struct ust_app_session *ua_sess;
2365 struct ust_app_event *ua_event;
2366 struct ust_app_channel *ua_chan = NULL;
2367 struct ust_app *app;
2368
2369 rcu_read_lock();
2370
2371 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2372 if (!app->compatible) {
2373 /*
2374 * TODO: In time, we should notice the caller of this error by
2375 * telling him that this is a version error.
2376 */
2377 continue;
2378 }
2379 ua_sess = lookup_session_by_app(usess, app);
2380 if (ua_sess == NULL) {
2381 continue;
2382 }
2383
2384 /* Lookup channel in the ust app session */
2385 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2386 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2387 if (ua_chan_node == NULL) {
2388 continue;
2389 }
2390 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2391 node);
2392
2393 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2394 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2395 if (ua_event_node == NULL) {
2396 continue;
2397 }
2398 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2399 node);
2400
2401 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2402 if (ret < 0) {
2403 continue;
2404 }
2405 }
2406
2407 rcu_read_unlock();
2408 return ret;
2409 }
2410
2411 /*
2412 * Enable event for a channel from a UST session for a specific PID.
2413 */
2414 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2415 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2416 {
2417 int ret = 0;
2418 struct lttng_ht_iter iter;
2419 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2420 struct ust_app *app;
2421 struct ust_app_session *ua_sess;
2422 struct ust_app_channel *ua_chan;
2423 struct ust_app_event *ua_event;
2424
2425 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2426
2427 rcu_read_lock();
2428
2429 app = ust_app_find_by_pid(pid);
2430 if (app == NULL) {
2431 ERR("UST app enable event per PID %d not found", pid);
2432 ret = -1;
2433 goto error;
2434 }
2435
2436 if (!app->compatible) {
2437 ret = 0;
2438 goto error;
2439 }
2440
2441 ua_sess = lookup_session_by_app(usess, app);
2442 /* If ua_sess is NULL, there is a code flow error */
2443 assert(ua_sess);
2444
2445 /* Lookup channel in the ust app session */
2446 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2447 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2448 /* If the channel is not found, there is a code flow error */
2449 assert(ua_chan_node);
2450
2451 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2452
2453 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2454 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2455 if (ua_event_node == NULL) {
2456 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2457 if (ret < 0) {
2458 goto error;
2459 }
2460 } else {
2461 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2462
2463 ret = enable_ust_app_event(ua_sess, ua_event, app);
2464 if (ret < 0) {
2465 goto error;
2466 }
2467 }
2468
2469 error:
2470 rcu_read_unlock();
2471 return ret;
2472 }
2473
2474 /*
2475 * Disable event for a channel from a UST session for a specific PID.
2476 */
2477 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2478 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2479 {
2480 int ret = 0;
2481 struct lttng_ht_iter iter;
2482 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2483 struct ust_app *app;
2484 struct ust_app_session *ua_sess;
2485 struct ust_app_channel *ua_chan;
2486 struct ust_app_event *ua_event;
2487
2488 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2489
2490 rcu_read_lock();
2491
2492 app = ust_app_find_by_pid(pid);
2493 if (app == NULL) {
2494 ERR("UST app disable event per PID %d not found", pid);
2495 ret = -1;
2496 goto error;
2497 }
2498
2499 if (!app->compatible) {
2500 ret = 0;
2501 goto error;
2502 }
2503
2504 ua_sess = lookup_session_by_app(usess, app);
2505 /* If ua_sess is NULL, there is a code flow error */
2506 assert(ua_sess);
2507
2508 /* Lookup channel in the ust app session */
2509 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2510 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2511 if (ua_chan_node == NULL) {
2512 /* Channel does not exist, skip disabling */
2513 goto error;
2514 }
2515 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2516
2517 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2518 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2519 if (ua_event_node == NULL) {
2520 /* Event does not exist, skip disabling */
2521 goto error;
2522 }
2523 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2524
2525 ret = disable_ust_app_event(ua_sess, ua_event, app);
2526 if (ret < 0) {
2527 goto error;
2528 }
2529
2530 error:
2531 rcu_read_unlock();
2532 return ret;
2533 }
2534
2535 /*
2536 * Validate version of UST apps and set the compatible bit.
2537 */
2538 int ust_app_validate_version(int sock)
2539 {
2540 int ret;
2541 struct ust_app *app;
2542
2543 rcu_read_lock();
2544
2545 app = find_app_by_sock(sock);
2546 assert(app);
2547
2548 ret = ustctl_tracer_version(sock, &app->version);
2549 if (ret < 0) {
2550 goto error;
2551 }
2552
2553 /* Validate version */
2554 if (app->version.major > UST_APP_MAJOR_VERSION) {
2555 goto error;
2556 }
2557
2558 DBG2("UST app PID %d is compatible with major version %d "
2559 "(supporting <= %d)", app->key.pid, app->version.major,
2560 UST_APP_MAJOR_VERSION);
2561 app->compatible = 1;
2562 rcu_read_unlock();
2563 return 0;
2564
2565 error:
2566 DBG2("UST app PID %d is not compatible with major version %d "
2567 "(supporting <= %d)", app->key.pid, app->version.major,
2568 UST_APP_MAJOR_VERSION);
2569 app->compatible = 0;
2570 rcu_read_unlock();
2571 return -1;
2572 }
2573
2574 /*
2575 * Calibrate registered applications.
2576 */
2577 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2578 {
2579 int ret = 0;
2580 struct lttng_ht_iter iter;
2581 struct ust_app *app;
2582
2583 rcu_read_lock();
2584
2585 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
2586 if (!app->compatible) {
2587 /*
2588 * TODO: In time, we should notice the caller of this error by
2589 * telling him that this is a version error.
2590 */
2591 continue;
2592 }
2593
2594 ret = ustctl_calibrate(app->key.sock, calibrate);
2595 if (ret < 0) {
2596 switch (ret) {
2597 case -ENOSYS:
2598 /* Means that it's not implemented on the tracer side. */
2599 ret = 0;
2600 break;
2601 default:
2602 /* TODO: Report error to user */
2603 DBG2("Calibrate app PID %d returned with error %d",
2604 app->key.pid, ret);
2605 break;
2606 }
2607 }
2608 }
2609
2610 DBG("UST app global domain calibration finished");
2611
2612 rcu_read_unlock();
2613
2614 return ret;
2615 }
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