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[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <errno.h>
20 #include <pthread.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/stat.h>
25 #include <sys/types.h>
26 #include <unistd.h>
27 #include <urcu/compiler.h>
28
29 #include <common/common.h>
30
31 #include "ust-app.h"
32 #include "ust-consumer.h"
33 #include "ust-ctl.h"
34
35 /*
36 * Delete ust context safely. RCU read lock must be held before calling
37 * this function.
38 */
39 static
40 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
41 {
42 if (ua_ctx->obj) {
43 ustctl_release_object(sock, ua_ctx->obj);
44 free(ua_ctx->obj);
45 }
46 free(ua_ctx);
47 }
48
49 /*
50 * Delete ust app event safely. RCU read lock must be held before calling
51 * this function.
52 */
53 static
54 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
55 {
56 int ret;
57 struct lttng_ht_iter iter;
58 struct ust_app_ctx *ua_ctx;
59
60 /* Destroy each context of event */
61 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
62 node.node) {
63 ret = lttng_ht_del(ua_event->ctx, &iter);
64 assert(!ret);
65 delete_ust_app_ctx(sock, ua_ctx);
66 }
67 lttng_ht_destroy(ua_event->ctx);
68
69 if (ua_event->obj != NULL) {
70 ustctl_release_object(sock, ua_event->obj);
71 free(ua_event->obj);
72 }
73 free(ua_event);
74 }
75
76 /*
77 * Delete ust app stream safely. RCU read lock must be held before calling
78 * this function.
79 */
80 static
81 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
82 {
83 if (stream->obj) {
84 ustctl_release_object(sock, stream->obj);
85 free(stream->obj);
86 }
87 free(stream);
88 }
89
90 /*
91 * Delete ust app channel safely. RCU read lock must be held before calling
92 * this function.
93 */
94 static
95 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
96 {
97 int ret;
98 struct lttng_ht_iter iter;
99 struct ust_app_event *ua_event;
100 struct ust_app_ctx *ua_ctx;
101 struct ltt_ust_stream *stream, *stmp;
102
103 /* Wipe stream */
104 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
105 cds_list_del(&stream->list);
106 delete_ust_app_stream(sock, stream);
107 }
108
109 /* Wipe context */
110 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
111 ret = lttng_ht_del(ua_chan->ctx, &iter);
112 assert(!ret);
113 delete_ust_app_ctx(sock, ua_ctx);
114 }
115 lttng_ht_destroy(ua_chan->ctx);
116
117 /* Wipe events */
118 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
119 node.node) {
120 ret = lttng_ht_del(ua_chan->events, &iter);
121 assert(!ret);
122 delete_ust_app_event(sock, ua_event);
123 }
124 lttng_ht_destroy(ua_chan->events);
125
126 if (ua_chan->obj != NULL) {
127 ustctl_release_object(sock, ua_chan->obj);
128 free(ua_chan->obj);
129 }
130 free(ua_chan);
131 }
132
133 /*
134 * Delete ust app session safely. RCU read lock must be held before calling
135 * this function.
136 */
137 static
138 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
139 {
140 int ret;
141 struct lttng_ht_iter iter;
142 struct ust_app_channel *ua_chan;
143
144 if (ua_sess->metadata) {
145 if (ua_sess->metadata->stream_obj) {
146 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
147 free(ua_sess->metadata->stream_obj);
148 }
149 if (ua_sess->metadata->obj) {
150 ustctl_release_object(sock, ua_sess->metadata->obj);
151 free(ua_sess->metadata->obj);
152 }
153 trace_ust_destroy_metadata(ua_sess->metadata);
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->sock;
185 app->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->sock, ua_sess);
193 }
194 lttng_ht_destroy(app->sessions);
195
196 /*
197 * Wait until we have deleted the application from the sock hash table
198 * before closing this socket, otherwise an application could re-use the
199 * socket ID and race with the teardown, using the same hash table entry.
200 *
201 * It's OK to leave the close in call_rcu. We want it to stay unique for
202 * all RCU readers that could run concurrently with unregister app,
203 * therefore we _need_ to only close that socket after a grace period. So
204 * it should stay in this RCU callback.
205 *
206 * This close() is a very important step of the synchronization model so
207 * every modification to this function must be carefully reviewed.
208 */
209 ret = close(sock);
210 if (ret) {
211 PERROR("close");
212 }
213
214 DBG2("UST app pid %d deleted", app->pid);
215 free(app);
216
217 rcu_read_unlock();
218 }
219
220 /*
221 * URCU intermediate call to delete an UST app.
222 */
223 static
224 void delete_ust_app_rcu(struct rcu_head *head)
225 {
226 struct lttng_ht_node_ulong *node =
227 caa_container_of(head, struct lttng_ht_node_ulong, head);
228 struct ust_app *app =
229 caa_container_of(node, struct ust_app, pid_n);
230
231 DBG3("Call RCU deleting app PID %d", app->pid);
232 delete_ust_app(app);
233 }
234
235 /*
236 * Alloc new UST app session.
237 */
238 static
239 struct ust_app_session *alloc_ust_app_session(void)
240 {
241 struct ust_app_session *ua_sess;
242
243 /* Init most of the default value by allocating and zeroing */
244 ua_sess = zmalloc(sizeof(struct ust_app_session));
245 if (ua_sess == NULL) {
246 PERROR("malloc");
247 goto error;
248 }
249
250 ua_sess->handle = -1;
251 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
252
253 return ua_sess;
254
255 error:
256 return NULL;
257 }
258
259 /*
260 * Alloc new UST app channel.
261 */
262 static
263 struct ust_app_channel *alloc_ust_app_channel(char *name,
264 struct lttng_ust_channel *attr)
265 {
266 struct ust_app_channel *ua_chan;
267
268 /* Init most of the default value by allocating and zeroing */
269 ua_chan = zmalloc(sizeof(struct ust_app_channel));
270 if (ua_chan == NULL) {
271 PERROR("malloc");
272 goto error;
273 }
274
275 /* Setup channel name */
276 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
277 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
278
279 ua_chan->enabled = 1;
280 ua_chan->handle = -1;
281 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
282 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
283 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
284
285 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
286
287 /* Copy attributes */
288 if (attr) {
289 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
290 }
291
292 DBG3("UST app channel %s allocated", ua_chan->name);
293
294 return ua_chan;
295
296 error:
297 return NULL;
298 }
299
300 /*
301 * Alloc new UST app event.
302 */
303 static
304 struct ust_app_event *alloc_ust_app_event(char *name,
305 struct lttng_ust_event *attr)
306 {
307 struct ust_app_event *ua_event;
308
309 /* Init most of the default value by allocating and zeroing */
310 ua_event = zmalloc(sizeof(struct ust_app_event));
311 if (ua_event == NULL) {
312 PERROR("malloc");
313 goto error;
314 }
315
316 ua_event->enabled = 1;
317 strncpy(ua_event->name, name, sizeof(ua_event->name));
318 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
319 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
320 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
321
322 /* Copy attributes */
323 if (attr) {
324 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
325 }
326
327 DBG3("UST app event %s allocated", ua_event->name);
328
329 return ua_event;
330
331 error:
332 return NULL;
333 }
334
335 /*
336 * Alloc new UST app context.
337 */
338 static
339 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
340 {
341 struct ust_app_ctx *ua_ctx;
342
343 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
344 if (ua_ctx == NULL) {
345 goto error;
346 }
347
348 if (uctx) {
349 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
350 }
351
352 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
353
354 error:
355 return ua_ctx;
356 }
357
358 /*
359 * Find an ust_app using the sock and return it. RCU read side lock must be
360 * held before calling this helper function.
361 */
362 static
363 struct ust_app *find_app_by_sock(int sock)
364 {
365 struct lttng_ht_node_ulong *node;
366 struct lttng_ht_iter iter;
367
368 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
369 node = lttng_ht_iter_get_node_ulong(&iter);
370 if (node == NULL) {
371 DBG2("UST app find by sock %d not found", sock);
372 goto error;
373 }
374
375 return caa_container_of(node, struct ust_app, sock_n);
376
377 error:
378 return NULL;
379 }
380
381 /*
382 * Create the channel context on the tracer.
383 */
384 static
385 int create_ust_channel_context(struct ust_app_channel *ua_chan,
386 struct ust_app_ctx *ua_ctx, struct ust_app *app)
387 {
388 int ret;
389
390 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
391 ua_chan->obj, &ua_ctx->obj);
392 if (ret < 0) {
393 goto error;
394 }
395
396 ua_ctx->handle = ua_ctx->obj->handle;
397
398 DBG2("UST app context created successfully for channel %s", ua_chan->name);
399
400 error:
401 return ret;
402 }
403
404 /*
405 * Create the event context on the tracer.
406 */
407 static
408 int create_ust_event_context(struct ust_app_event *ua_event,
409 struct ust_app_ctx *ua_ctx, struct ust_app *app)
410 {
411 int ret;
412
413 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
414 ua_event->obj, &ua_ctx->obj);
415 if (ret < 0) {
416 goto error;
417 }
418
419 ua_ctx->handle = ua_ctx->obj->handle;
420
421 DBG2("UST app context created successfully for event %s", ua_event->name);
422
423 error:
424 return ret;
425 }
426
427 /*
428 * Disable the specified event on to UST tracer for the UST session.
429 */
430 static int disable_ust_event(struct ust_app *app,
431 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
432 {
433 int ret;
434
435 ret = ustctl_disable(app->sock, ua_event->obj);
436 if (ret < 0) {
437 ERR("UST app event %s disable failed for app (pid: %d) "
438 "and session handle %d with ret %d",
439 ua_event->attr.name, app->pid, ua_sess->handle, ret);
440 goto error;
441 }
442
443 DBG2("UST app event %s disabled successfully for app (pid: %d)",
444 ua_event->attr.name, app->pid);
445
446 error:
447 return ret;
448 }
449
450 /*
451 * Disable the specified channel on to UST tracer for the UST session.
452 */
453 static int disable_ust_channel(struct ust_app *app,
454 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
455 {
456 int ret;
457
458 ret = ustctl_disable(app->sock, ua_chan->obj);
459 if (ret < 0) {
460 ERR("UST app channel %s disable failed for app (pid: %d) "
461 "and session handle %d with ret %d",
462 ua_chan->name, app->pid, ua_sess->handle, ret);
463 goto error;
464 }
465
466 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
467 ua_chan->name, app->pid);
468
469 error:
470 return ret;
471 }
472
473 /*
474 * Enable the specified channel on to UST tracer for the UST session.
475 */
476 static int enable_ust_channel(struct ust_app *app,
477 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
478 {
479 int ret;
480
481 ret = ustctl_enable(app->sock, ua_chan->obj);
482 if (ret < 0) {
483 ERR("UST app channel %s enable failed for app (pid: %d) "
484 "and session handle %d with ret %d",
485 ua_chan->name, app->pid, ua_sess->handle, ret);
486 goto error;
487 }
488
489 ua_chan->enabled = 1;
490
491 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
492 ua_chan->name, app->pid);
493
494 error:
495 return ret;
496 }
497
498 /*
499 * Enable the specified event on to UST tracer for the UST session.
500 */
501 static int enable_ust_event(struct ust_app *app,
502 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
503 {
504 int ret;
505
506 ret = ustctl_enable(app->sock, ua_event->obj);
507 if (ret < 0) {
508 ERR("UST app event %s enable failed for app (pid: %d) "
509 "and session handle %d with ret %d",
510 ua_event->attr.name, app->pid, ua_sess->handle, ret);
511 goto error;
512 }
513
514 DBG2("UST app event %s enabled successfully for app (pid: %d)",
515 ua_event->attr.name, app->pid);
516
517 error:
518 return ret;
519 }
520
521 /*
522 * Open metadata onto the UST tracer for a UST session.
523 */
524 static int open_ust_metadata(struct ust_app *app,
525 struct ust_app_session *ua_sess)
526 {
527 int ret;
528 struct lttng_ust_channel_attr uattr;
529
530 uattr.overwrite = ua_sess->metadata->attr.overwrite;
531 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
532 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
533 uattr.switch_timer_interval =
534 ua_sess->metadata->attr.switch_timer_interval;
535 uattr.read_timer_interval =
536 ua_sess->metadata->attr.read_timer_interval;
537 uattr.output = ua_sess->metadata->attr.output;
538
539 /* UST tracer metadata creation */
540 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
541 &ua_sess->metadata->obj);
542 if (ret < 0) {
543 ERR("UST app open metadata failed for app pid:%d with ret %d",
544 app->pid, ret);
545 goto error;
546 }
547
548 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
549
550 error:
551 return ret;
552 }
553
554 /*
555 * Create stream onto the UST tracer for a UST session.
556 */
557 static int create_ust_stream(struct ust_app *app,
558 struct ust_app_session *ua_sess)
559 {
560 int ret;
561
562 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
563 &ua_sess->metadata->stream_obj);
564 if (ret < 0) {
565 ERR("UST create metadata stream failed");
566 goto error;
567 }
568
569 error:
570 return ret;
571 }
572
573 /*
574 * Create the specified channel onto the UST tracer for a UST session.
575 */
576 static int create_ust_channel(struct ust_app *app,
577 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
578 {
579 int ret;
580
581 /* TODO: remove cast and use lttng-ust-abi.h */
582 ret = ustctl_create_channel(app->sock, ua_sess->handle,
583 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
584 if (ret < 0) {
585 ERR("Creating channel %s for app (pid: %d, sock: %d) "
586 "and session handle %d with ret %d",
587 ua_chan->name, app->pid, app->sock,
588 ua_sess->handle, ret);
589 goto error;
590 }
591
592 ua_chan->handle = ua_chan->obj->handle;
593
594 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
595 ua_chan->name, app->pid, app->sock);
596
597 /* If channel is not enabled, disable it on the tracer */
598 if (!ua_chan->enabled) {
599 ret = disable_ust_channel(app, ua_sess, ua_chan);
600 if (ret < 0) {
601 goto error;
602 }
603 }
604
605 error:
606 return ret;
607 }
608
609 /*
610 * Create the specified event onto the UST tracer for a UST session.
611 */
612 static
613 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
614 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
615 {
616 int ret = 0;
617
618 /* Create UST event on tracer */
619 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
620 &ua_event->obj);
621 if (ret < 0) {
622 if (ret == -EEXIST) {
623 ret = 0;
624 goto error;
625 }
626 ERR("Error ustctl create event %s for app pid: %d with ret %d",
627 ua_event->attr.name, app->pid, ret);
628 goto error;
629 }
630
631 ua_event->handle = ua_event->obj->handle;
632
633 DBG2("UST app event %s created successfully for pid:%d",
634 ua_event->attr.name, app->pid);
635
636 /* If event not enabled, disable it on the tracer */
637 if (ua_event->enabled == 0) {
638 ret = disable_ust_event(app, ua_sess, ua_event);
639 if (ret < 0) {
640 /*
641 * If we hit an EPERM, something is wrong with our disable call. If
642 * we get an EEXIST, there is a problem on the tracer side since we
643 * just created it.
644 */
645 switch (ret) {
646 case -EPERM:
647 /* Code flow problem */
648 assert(0);
649 case -EEXIST:
650 /* It's OK for our use case. */
651 ret = 0;
652 break;
653 default:
654 break;
655 }
656 goto error;
657 }
658 }
659
660 error:
661 return ret;
662 }
663
664 /*
665 * Copy data between an UST app event and a LTT event.
666 */
667 static void shadow_copy_event(struct ust_app_event *ua_event,
668 struct ltt_ust_event *uevent)
669 {
670 struct lttng_ht_iter iter;
671 struct ltt_ust_context *uctx;
672 struct ust_app_ctx *ua_ctx;
673
674 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
675 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
676
677 ua_event->enabled = uevent->enabled;
678
679 /* Copy event attributes */
680 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
681
682 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
683 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
684 if (ua_ctx == NULL) {
685 /* malloc() failed. We should simply stop */
686 return;
687 }
688
689 lttng_ht_node_init_ulong(&ua_ctx->node,
690 (unsigned long) ua_ctx->ctx.ctx);
691 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
692 }
693 }
694
695 /*
696 * Copy data between an UST app channel and a LTT channel.
697 */
698 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
699 struct ltt_ust_channel *uchan)
700 {
701 struct lttng_ht_iter iter;
702 struct lttng_ht_node_str *ua_event_node;
703 struct ltt_ust_event *uevent;
704 struct ltt_ust_context *uctx;
705 struct ust_app_event *ua_event;
706 struct ust_app_ctx *ua_ctx;
707
708 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
709
710 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
711 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
712 /* Copy event attributes */
713 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
714
715 ua_chan->enabled = uchan->enabled;
716
717 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
718 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
719 if (ua_ctx == NULL) {
720 continue;
721 }
722 lttng_ht_node_init_ulong(&ua_ctx->node,
723 (unsigned long) ua_ctx->ctx.ctx);
724 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
725 }
726
727 /* Copy all events from ltt ust channel to ust app channel */
728 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
729 struct lttng_ht_iter uiter;
730
731 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
732 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
733 if (ua_event_node == NULL) {
734 DBG2("UST event %s not found on shadow copy channel",
735 uevent->attr.name);
736 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
737 if (ua_event == NULL) {
738 continue;
739 }
740 shadow_copy_event(ua_event, uevent);
741 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
742 }
743 }
744
745 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
746 }
747
748 /*
749 * Copy data between a UST app session and a regular LTT session.
750 */
751 static void shadow_copy_session(struct ust_app_session *ua_sess,
752 struct ltt_ust_session *usess, struct ust_app *app)
753 {
754 struct lttng_ht_node_str *ua_chan_node;
755 struct lttng_ht_iter iter;
756 struct ltt_ust_channel *uchan;
757 struct ust_app_channel *ua_chan;
758 time_t rawtime;
759 struct tm *timeinfo;
760 char datetime[16];
761 int ret;
762
763 /* Get date and time for unique app path */
764 time(&rawtime);
765 timeinfo = localtime(&rawtime);
766 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
767
768 DBG2("Shadow copy of session handle %d", ua_sess->handle);
769
770 ua_sess->id = usess->id;
771 ua_sess->uid = usess->uid;
772 ua_sess->gid = usess->gid;
773
774 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
775 app->name, app->pid, datetime);
776 if (ret < 0) {
777 PERROR("asprintf UST shadow copy session");
778 /* TODO: We cannot return an error from here.. */
779 assert(0);
780 }
781
782 /* TODO: support all UST domain */
783
784 /* Iterate over all channels in global domain. */
785 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
786 uchan, node.node) {
787 struct lttng_ht_iter uiter;
788
789 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
790 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
791 if (ua_chan_node != NULL) {
792 /* Session exist. Contiuing. */
793 continue;
794 }
795
796 DBG2("Channel %s not found on shadow session copy, creating it",
797 uchan->name);
798 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
799 if (ua_chan == NULL) {
800 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
801 continue;
802 }
803
804 shadow_copy_channel(ua_chan, uchan);
805 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
806 }
807 }
808
809 /*
810 * Lookup sesison wrapper.
811 */
812 static
813 void __lookup_session_by_app(struct ltt_ust_session *usess,
814 struct ust_app *app, struct lttng_ht_iter *iter)
815 {
816 /* Get right UST app session from app */
817 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
818 }
819
820 /*
821 * Return ust app session from the app session hashtable using the UST session
822 * id.
823 */
824 static struct ust_app_session *lookup_session_by_app(
825 struct ltt_ust_session *usess, struct ust_app *app)
826 {
827 struct lttng_ht_iter iter;
828 struct lttng_ht_node_ulong *node;
829
830 __lookup_session_by_app(usess, app, &iter);
831 node = lttng_ht_iter_get_node_ulong(&iter);
832 if (node == NULL) {
833 goto error;
834 }
835
836 return caa_container_of(node, struct ust_app_session, node);
837
838 error:
839 return NULL;
840 }
841
842 /*
843 * Create a UST session onto the tracer of app and add it the session
844 * hashtable.
845 *
846 * Return ust app session or NULL on error.
847 */
848 static struct ust_app_session *create_ust_app_session(
849 struct ltt_ust_session *usess, struct ust_app *app)
850 {
851 int ret;
852 struct ust_app_session *ua_sess;
853
854 ua_sess = lookup_session_by_app(usess, app);
855 if (ua_sess == NULL) {
856 DBG2("UST app pid: %d session id %d not found, creating it",
857 app->pid, usess->id);
858 ua_sess = alloc_ust_app_session();
859 if (ua_sess == NULL) {
860 /* Only malloc can failed so something is really wrong */
861 goto end;
862 }
863 shadow_copy_session(ua_sess, usess, app);
864 }
865
866 if (ua_sess->handle == -1) {
867 ret = ustctl_create_session(app->sock);
868 if (ret < 0) {
869 ERR("Creating session for app pid %d", app->pid);
870 /* This means that the tracer is gone... */
871 ua_sess = (void*) -1UL;
872 goto error;
873 }
874
875 ua_sess->handle = ret;
876
877 /* Add ust app session to app's HT */
878 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
879 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
880
881 DBG2("UST app session created successfully with handle %d", ret);
882 }
883
884 end:
885 return ua_sess;
886
887 error:
888 delete_ust_app_session(-1, ua_sess);
889 return NULL;
890 }
891
892 /*
893 * Create a context for the channel on the tracer.
894 */
895 static
896 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
897 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
898 struct ust_app *app)
899 {
900 int ret = 0;
901 struct lttng_ht_iter iter;
902 struct lttng_ht_node_ulong *node;
903 struct ust_app_ctx *ua_ctx;
904
905 DBG2("UST app adding context to channel %s", ua_chan->name);
906
907 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
908 node = lttng_ht_iter_get_node_ulong(&iter);
909 if (node != NULL) {
910 ret = -EEXIST;
911 goto error;
912 }
913
914 ua_ctx = alloc_ust_app_ctx(uctx);
915 if (ua_ctx == NULL) {
916 /* malloc failed */
917 ret = -1;
918 goto error;
919 }
920
921 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
922 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
923
924 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
925 if (ret < 0) {
926 goto error;
927 }
928
929 error:
930 return ret;
931 }
932
933 /*
934 * Create an UST context and enable it for the event on the tracer.
935 */
936 static
937 int create_ust_app_event_context(struct ust_app_session *ua_sess,
938 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
939 struct ust_app *app)
940 {
941 int ret = 0;
942 struct lttng_ht_iter iter;
943 struct lttng_ht_node_ulong *node;
944 struct ust_app_ctx *ua_ctx;
945
946 DBG2("UST app adding context to event %s", ua_event->name);
947
948 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
949 node = lttng_ht_iter_get_node_ulong(&iter);
950 if (node != NULL) {
951 ret = -EEXIST;
952 goto error;
953 }
954
955 ua_ctx = alloc_ust_app_ctx(uctx);
956 if (ua_ctx == NULL) {
957 /* malloc failed */
958 ret = -1;
959 goto error;
960 }
961
962 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
963 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
964
965 ret = create_ust_event_context(ua_event, ua_ctx, app);
966 if (ret < 0) {
967 goto error;
968 }
969
970 error:
971 return ret;
972 }
973
974 /*
975 * Enable on the tracer side a ust app event for the session and channel.
976 */
977 static
978 int enable_ust_app_event(struct ust_app_session *ua_sess,
979 struct ust_app_event *ua_event, struct ust_app *app)
980 {
981 int ret;
982
983 ret = enable_ust_event(app, ua_sess, ua_event);
984 if (ret < 0) {
985 goto error;
986 }
987
988 ua_event->enabled = 1;
989
990 error:
991 return ret;
992 }
993
994 /*
995 * Disable on the tracer side a ust app event for the session and channel.
996 */
997 static int disable_ust_app_event(struct ust_app_session *ua_sess,
998 struct ust_app_event *ua_event, struct ust_app *app)
999 {
1000 int ret;
1001
1002 ret = disable_ust_event(app, ua_sess, ua_event);
1003 if (ret < 0) {
1004 goto error;
1005 }
1006
1007 ua_event->enabled = 0;
1008
1009 error:
1010 return ret;
1011 }
1012
1013 /*
1014 * Lookup ust app channel for session and disable it on the tracer side.
1015 */
1016 static
1017 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1018 struct ust_app_channel *ua_chan, struct ust_app *app)
1019 {
1020 int ret;
1021
1022 ret = disable_ust_channel(app, ua_sess, ua_chan);
1023 if (ret < 0) {
1024 goto error;
1025 }
1026
1027 ua_chan->enabled = 0;
1028
1029 error:
1030 return ret;
1031 }
1032
1033 /*
1034 * Lookup ust app channel for session and enable it on the tracer side.
1035 */
1036 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1037 struct ltt_ust_channel *uchan, struct ust_app *app)
1038 {
1039 int ret = 0;
1040 struct lttng_ht_iter iter;
1041 struct lttng_ht_node_str *ua_chan_node;
1042 struct ust_app_channel *ua_chan;
1043
1044 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1045 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1046 if (ua_chan_node == NULL) {
1047 DBG2("Unable to find channel %s in ust session id %u",
1048 uchan->name, ua_sess->id);
1049 goto error;
1050 }
1051
1052 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1053
1054 ret = enable_ust_channel(app, ua_sess, ua_chan);
1055 if (ret < 0) {
1056 goto error;
1057 }
1058
1059 error:
1060 return ret;
1061 }
1062
1063 /*
1064 * Create UST app channel and create it on the tracer.
1065 */
1066 static struct ust_app_channel *create_ust_app_channel(
1067 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1068 struct ust_app *app)
1069 {
1070 int ret = 0;
1071 struct lttng_ht_iter iter;
1072 struct lttng_ht_node_str *ua_chan_node;
1073 struct ust_app_channel *ua_chan;
1074
1075 /* Lookup channel in the ust app session */
1076 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1077 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1078 if (ua_chan_node != NULL) {
1079 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1080 goto end;
1081 }
1082
1083 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1084 if (ua_chan == NULL) {
1085 /* Only malloc can fail here */
1086 goto error;
1087 }
1088 shadow_copy_channel(ua_chan, uchan);
1089
1090 ret = create_ust_channel(app, ua_sess, ua_chan);
1091 if (ret < 0) {
1092 /* Not found previously means that it does not exist on the tracer */
1093 assert(ret != -EEXIST);
1094 goto error;
1095 }
1096
1097 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1098
1099 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1100 app->pid);
1101
1102 end:
1103 return ua_chan;
1104
1105 error:
1106 delete_ust_app_channel(-1, ua_chan);
1107 return NULL;
1108 }
1109
1110 /*
1111 * Create UST app event and create it on the tracer side.
1112 */
1113 static
1114 int create_ust_app_event(struct ust_app_session *ua_sess,
1115 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1116 struct ust_app *app)
1117 {
1118 int ret = 0;
1119 struct lttng_ht_iter iter;
1120 struct lttng_ht_node_str *ua_event_node;
1121 struct ust_app_event *ua_event;
1122
1123 /* Get event node */
1124 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1125 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1126 if (ua_event_node != NULL) {
1127 ret = -EEXIST;
1128 goto end;
1129 }
1130
1131 /* Does not exist so create one */
1132 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1133 if (ua_event == NULL) {
1134 /* Only malloc can failed so something is really wrong */
1135 ret = -ENOMEM;
1136 goto end;
1137 }
1138 shadow_copy_event(ua_event, uevent);
1139
1140 /* Create it on the tracer side */
1141 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1142 if (ret < 0) {
1143 /* Not found previously means that it does not exist on the tracer */
1144 assert(ret != -EEXIST);
1145 goto error;
1146 }
1147
1148 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1149
1150 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1151 app->pid);
1152
1153 end:
1154 return ret;
1155
1156 error:
1157 /* Valid. Calling here is already in a read side lock */
1158 delete_ust_app_event(-1, ua_event);
1159 return ret;
1160 }
1161
1162 /*
1163 * Create UST metadata and open it on the tracer side.
1164 */
1165 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1166 char *pathname, struct ust_app *app)
1167 {
1168 int ret = 0;
1169
1170 if (ua_sess->metadata == NULL) {
1171 /* Allocate UST metadata */
1172 ua_sess->metadata = trace_ust_create_metadata(pathname);
1173 if (ua_sess->metadata == NULL) {
1174 /* malloc() failed */
1175 goto error;
1176 }
1177
1178 ret = open_ust_metadata(app, ua_sess);
1179 if (ret < 0) {
1180 DBG3("Opening metadata failed. Cleaning up memory");
1181
1182 /* Cleanup failed metadata struct */
1183 free(ua_sess->metadata);
1184 /*
1185 * This is very important because delete_ust_app_session check if
1186 * the pointer is null or not in order to delete the metadata.
1187 */
1188 ua_sess->metadata = NULL;
1189 goto error;
1190 }
1191
1192 DBG2("UST metadata opened for app pid %d", app->pid);
1193 }
1194
1195 /* Open UST metadata stream */
1196 if (ua_sess->metadata->stream_obj == NULL) {
1197 ret = create_ust_stream(app, ua_sess);
1198 if (ret < 0) {
1199 goto error;
1200 }
1201
1202 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
1203 ua_sess->uid, ua_sess->gid);
1204 if (ret < 0) {
1205 PERROR("mkdir UST metadata");
1206 goto error;
1207 }
1208
1209 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1210 "%s/metadata", ua_sess->path);
1211 if (ret < 0) {
1212 PERROR("asprintf UST create stream");
1213 goto error;
1214 }
1215
1216 DBG2("UST metadata stream object created for app pid %d",
1217 app->pid);
1218 } else {
1219 ERR("Attempting to create stream without metadata opened");
1220 goto error;
1221 }
1222
1223 return 0;
1224
1225 error:
1226 return -1;
1227 }
1228
1229 /*
1230 * Return pointer to traceable apps list.
1231 */
1232 struct lttng_ht *ust_app_get_ht(void)
1233 {
1234 return ust_app_ht;
1235 }
1236
1237 /*
1238 * Return ust app pointer or NULL if not found.
1239 */
1240 struct ust_app *ust_app_find_by_pid(pid_t pid)
1241 {
1242 struct lttng_ht_node_ulong *node;
1243 struct lttng_ht_iter iter;
1244
1245 rcu_read_lock();
1246 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1247 node = lttng_ht_iter_get_node_ulong(&iter);
1248 if (node == NULL) {
1249 DBG2("UST app no found with pid %d", pid);
1250 goto error;
1251 }
1252 rcu_read_unlock();
1253
1254 DBG2("Found UST app by pid %d", pid);
1255
1256 return caa_container_of(node, struct ust_app, pid_n);
1257
1258 error:
1259 rcu_read_unlock();
1260 return NULL;
1261 }
1262
1263 /*
1264 * Using pid and uid (of the app), allocate a new ust_app struct and
1265 * add it to the global traceable app list.
1266 *
1267 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1268 * bitness is not supported.
1269 */
1270 int ust_app_register(struct ust_register_msg *msg, int sock)
1271 {
1272 struct ust_app *lta;
1273 int ret;
1274
1275 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1276 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1277 ERR("Registration failed: application \"%s\" (pid: %d) has "
1278 "%d-bit long, but no consumerd for this long size is available.\n",
1279 msg->name, msg->pid, msg->bits_per_long);
1280 ret = close(sock);
1281 if (ret) {
1282 PERROR("close");
1283 }
1284 return -EINVAL;
1285 }
1286 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1287 ERR("Registration failed: application \"%s\" (pid: %d) has "
1288 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1289 msg->name, msg->pid, msg->major, msg->minor);
1290 ret = close(sock);
1291 if (ret) {
1292 PERROR("close");
1293 }
1294 return -EINVAL;
1295 }
1296 lta = zmalloc(sizeof(struct ust_app));
1297 if (lta == NULL) {
1298 PERROR("malloc");
1299 return -ENOMEM;
1300 }
1301
1302 lta->ppid = msg->ppid;
1303 lta->uid = msg->uid;
1304 lta->gid = msg->gid;
1305 lta->compatible = 0; /* Not compatible until proven */
1306 lta->bits_per_long = msg->bits_per_long;
1307 lta->v_major = msg->major;
1308 lta->v_minor = msg->minor;
1309 strncpy(lta->name, msg->name, sizeof(lta->name));
1310 lta->name[16] = '\0';
1311 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1312
1313 lta->pid = msg->pid;
1314 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1315 lta->sock = sock;
1316 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
1317
1318 rcu_read_lock();
1319
1320 /*
1321 * On a re-registration, we want to kick out the previous registration of
1322 * that pid
1323 */
1324 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1325
1326 /*
1327 * The socket _should_ be unique until _we_ call close. So, a add_unique
1328 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1329 * already in the table.
1330 */
1331 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1332
1333 rcu_read_unlock();
1334
1335 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1336 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1337 lta->sock, lta->name, lta->v_major, lta->v_minor);
1338
1339 return 0;
1340 }
1341
1342 /*
1343 * Unregister app by removing it from the global traceable app list and freeing
1344 * the data struct.
1345 *
1346 * The socket is already closed at this point so no close to sock.
1347 */
1348 void ust_app_unregister(int sock)
1349 {
1350 struct ust_app *lta;
1351 struct lttng_ht_node_ulong *node;
1352 struct lttng_ht_iter iter;
1353 int ret;
1354
1355 rcu_read_lock();
1356
1357 /* Get the node reference for a call_rcu */
1358 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
1359 node = lttng_ht_iter_get_node_ulong(&iter);
1360 if (node == NULL) {
1361 ERR("Unable to find app by sock %d", sock);
1362 goto error;
1363 }
1364
1365 lta = caa_container_of(node, struct ust_app, sock_n);
1366
1367 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1368
1369 /* Remove application from PID hash table */
1370 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1371 assert(!ret);
1372
1373 /* Assign second node for deletion */
1374 iter.iter.node = &lta->pid_n.node;
1375
1376 ret = lttng_ht_del(ust_app_ht, &iter);
1377 assert(!ret);
1378
1379 /* Free memory */
1380 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1381
1382 error:
1383 rcu_read_unlock();
1384 return;
1385 }
1386
1387 /*
1388 * Return traceable_app_count
1389 */
1390 unsigned long ust_app_list_count(void)
1391 {
1392 unsigned long count;
1393
1394 rcu_read_lock();
1395 count = lttng_ht_get_count(ust_app_ht);
1396 rcu_read_unlock();
1397
1398 return count;
1399 }
1400
1401 /*
1402 * Fill events array with all events name of all registered apps.
1403 */
1404 int ust_app_list_events(struct lttng_event **events)
1405 {
1406 int ret, handle;
1407 size_t nbmem, count = 0;
1408 struct lttng_ht_iter iter;
1409 struct ust_app *app;
1410 struct lttng_event *tmp;
1411
1412 nbmem = UST_APP_EVENT_LIST_SIZE;
1413 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1414 if (tmp == NULL) {
1415 PERROR("zmalloc ust app events");
1416 ret = -ENOMEM;
1417 goto error;
1418 }
1419
1420 rcu_read_lock();
1421
1422 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1423 struct lttng_ust_tracepoint_iter uiter;
1424
1425 if (!app->compatible) {
1426 /*
1427 * TODO: In time, we should notice the caller of this error by
1428 * telling him that this is a version error.
1429 */
1430 continue;
1431 }
1432 handle = ustctl_tracepoint_list(app->sock);
1433 if (handle < 0) {
1434 ERR("UST app list events getting handle failed for app pid %d",
1435 app->pid);
1436 continue;
1437 }
1438
1439 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
1440 &uiter)) != -ENOENT) {
1441 if (count >= nbmem) {
1442 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1443 2 * nbmem);
1444 nbmem *= 2;
1445 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1446 if (tmp == NULL) {
1447 PERROR("realloc ust app events");
1448 ret = -ENOMEM;
1449 goto rcu_error;
1450 }
1451 }
1452 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1453 tmp[count].loglevel = uiter.loglevel;
1454 tmp[count].type = LTTNG_UST_TRACEPOINT;
1455 tmp[count].pid = app->pid;
1456 tmp[count].enabled = -1;
1457 count++;
1458 }
1459 }
1460
1461 ret = count;
1462 *events = tmp;
1463
1464 DBG2("UST app list events done (%zu events)", count);
1465
1466 rcu_error:
1467 rcu_read_unlock();
1468 error:
1469 return ret;
1470 }
1471
1472 /*
1473 * Free and clean all traceable apps of the global list.
1474 */
1475 void ust_app_clean_list(void)
1476 {
1477 int ret;
1478 struct lttng_ht_iter iter;
1479 struct lttng_ht_node_ulong *node;
1480
1481 DBG2("UST app cleaning registered apps hash table");
1482
1483 rcu_read_lock();
1484
1485 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1486 ret = lttng_ht_del(ust_app_ht, &iter);
1487 assert(!ret);
1488 call_rcu(&node->head, delete_ust_app_rcu);
1489 }
1490
1491 /* Cleanup socket hash table */
1492 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1493 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1494 assert(!ret);
1495 }
1496
1497 /* Destroy is done only when the ht is empty */
1498 lttng_ht_destroy(ust_app_ht);
1499 lttng_ht_destroy(ust_app_ht_by_sock);
1500
1501 rcu_read_unlock();
1502 }
1503
1504 /*
1505 * Init UST app hash table.
1506 */
1507 void ust_app_ht_alloc(void)
1508 {
1509 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1510 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1511 }
1512
1513 /*
1514 * For a specific UST session, disable the channel for all registered apps.
1515 */
1516 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1517 struct ltt_ust_channel *uchan)
1518 {
1519 int ret = 0;
1520 struct lttng_ht_iter iter;
1521 struct lttng_ht_node_str *ua_chan_node;
1522 struct ust_app *app;
1523 struct ust_app_session *ua_sess;
1524 struct ust_app_channel *ua_chan;
1525
1526 if (usess == NULL || uchan == NULL) {
1527 ERR("Disabling UST global channel with NULL values");
1528 ret = -1;
1529 goto error;
1530 }
1531
1532 DBG2("UST app disabling channel %s from global domain for session id %d",
1533 uchan->name, usess->id);
1534
1535 rcu_read_lock();
1536
1537 /* For every registered applications */
1538 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1539 struct lttng_ht_iter uiter;
1540 if (!app->compatible) {
1541 /*
1542 * TODO: In time, we should notice the caller of this error by
1543 * telling him that this is a version error.
1544 */
1545 continue;
1546 }
1547 ua_sess = lookup_session_by_app(usess, app);
1548 if (ua_sess == NULL) {
1549 continue;
1550 }
1551
1552 /* Get channel */
1553 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1554 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1555 /* If the session if found for the app, the channel must be there */
1556 assert(ua_chan_node);
1557
1558 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1559 /* The channel must not be already disabled */
1560 assert(ua_chan->enabled == 1);
1561
1562 /* Disable channel onto application */
1563 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1564 if (ret < 0) {
1565 /* XXX: We might want to report this error at some point... */
1566 continue;
1567 }
1568 }
1569
1570 rcu_read_unlock();
1571
1572 error:
1573 return ret;
1574 }
1575
1576 /*
1577 * For a specific UST session, enable the channel for all registered apps.
1578 */
1579 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1580 struct ltt_ust_channel *uchan)
1581 {
1582 int ret = 0;
1583 struct lttng_ht_iter iter;
1584 struct ust_app *app;
1585 struct ust_app_session *ua_sess;
1586
1587 if (usess == NULL || uchan == NULL) {
1588 ERR("Adding UST global channel to NULL values");
1589 ret = -1;
1590 goto error;
1591 }
1592
1593 DBG2("UST app enabling channel %s to global domain for session id %d",
1594 uchan->name, usess->id);
1595
1596 rcu_read_lock();
1597
1598 /* For every registered applications */
1599 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1600 if (!app->compatible) {
1601 /*
1602 * TODO: In time, we should notice the caller of this error by
1603 * telling him that this is a version error.
1604 */
1605 continue;
1606 }
1607 ua_sess = lookup_session_by_app(usess, app);
1608 if (ua_sess == NULL) {
1609 continue;
1610 }
1611
1612 /* Enable channel onto application */
1613 ret = enable_ust_app_channel(ua_sess, uchan, app);
1614 if (ret < 0) {
1615 /* XXX: We might want to report this error at some point... */
1616 continue;
1617 }
1618 }
1619
1620 rcu_read_unlock();
1621
1622 error:
1623 return ret;
1624 }
1625
1626 /*
1627 * Disable an event in a channel and for a specific session.
1628 */
1629 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1630 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1631 {
1632 int ret = 0;
1633 struct lttng_ht_iter iter, uiter;
1634 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1635 struct ust_app *app;
1636 struct ust_app_session *ua_sess;
1637 struct ust_app_channel *ua_chan;
1638 struct ust_app_event *ua_event;
1639
1640 DBG("UST app disabling event %s for all apps in channel "
1641 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1642
1643 rcu_read_lock();
1644
1645 /* For all registered applications */
1646 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1647 if (!app->compatible) {
1648 /*
1649 * TODO: In time, we should notice the caller of this error by
1650 * telling him that this is a version error.
1651 */
1652 continue;
1653 }
1654 ua_sess = lookup_session_by_app(usess, app);
1655 if (ua_sess == NULL) {
1656 /* Next app */
1657 continue;
1658 }
1659
1660 /* Lookup channel in the ust app session */
1661 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1662 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1663 if (ua_chan_node == NULL) {
1664 DBG2("Channel %s not found in session id %d for app pid %d."
1665 "Skipping", uchan->name, usess->id, app->pid);
1666 continue;
1667 }
1668 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1669
1670 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1671 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1672 if (ua_event_node == NULL) {
1673 DBG2("Event %s not found in channel %s for app pid %d."
1674 "Skipping", uevent->attr.name, uchan->name, app->pid);
1675 continue;
1676 }
1677 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1678
1679 ret = disable_ust_app_event(ua_sess, ua_event, app);
1680 if (ret < 0) {
1681 /* XXX: Report error someday... */
1682 continue;
1683 }
1684 }
1685
1686 rcu_read_unlock();
1687
1688 return ret;
1689 }
1690
1691 /*
1692 * For a specific UST session and UST channel, the event for all
1693 * registered apps.
1694 */
1695 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1696 struct ltt_ust_channel *uchan)
1697 {
1698 int ret = 0;
1699 struct lttng_ht_iter iter, uiter;
1700 struct lttng_ht_node_str *ua_chan_node;
1701 struct ust_app *app;
1702 struct ust_app_session *ua_sess;
1703 struct ust_app_channel *ua_chan;
1704 struct ust_app_event *ua_event;
1705
1706 DBG("UST app disabling all event for all apps in channel "
1707 "%s for session id %d", uchan->name, usess->id);
1708
1709 rcu_read_lock();
1710
1711 /* For all registered applications */
1712 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1713 if (!app->compatible) {
1714 /*
1715 * TODO: In time, we should notice the caller of this error by
1716 * telling him that this is a version error.
1717 */
1718 continue;
1719 }
1720 ua_sess = lookup_session_by_app(usess, app);
1721 /* If ua_sess is NULL, there is a code flow error */
1722 assert(ua_sess);
1723
1724 /* Lookup channel in the ust app session */
1725 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1726 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1727 /* If the channel is not found, there is a code flow error */
1728 assert(ua_chan_node);
1729
1730 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1731
1732 /* Disable each events of channel */
1733 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1734 node.node) {
1735 ret = disable_ust_app_event(ua_sess, ua_event, app);
1736 if (ret < 0) {
1737 /* XXX: Report error someday... */
1738 continue;
1739 }
1740 }
1741 }
1742
1743 rcu_read_unlock();
1744
1745 return ret;
1746 }
1747
1748 /*
1749 * For a specific UST session, create the channel for all registered apps.
1750 */
1751 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1752 struct ltt_ust_channel *uchan)
1753 {
1754 struct lttng_ht_iter iter;
1755 struct ust_app *app;
1756 struct ust_app_session *ua_sess;
1757 struct ust_app_channel *ua_chan;
1758
1759 /* Very wrong code flow */
1760 assert(usess);
1761 assert(uchan);
1762
1763 DBG2("UST app adding channel %s to global domain for session id %d",
1764 uchan->name, usess->id);
1765
1766 rcu_read_lock();
1767
1768 /* For every registered applications */
1769 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1770 if (!app->compatible) {
1771 /*
1772 * TODO: In time, we should notice the caller of this error by
1773 * telling him that this is a version error.
1774 */
1775 continue;
1776 }
1777 /*
1778 * Create session on the tracer side and add it to app session HT. Note
1779 * that if session exist, it will simply return a pointer to the ust
1780 * app session.
1781 */
1782 ua_sess = create_ust_app_session(usess, app);
1783 if (ua_sess == NULL) {
1784 /* The malloc() failed. */
1785 goto error;
1786 } else if (ua_sess == (void *) -1UL) {
1787 /* The application's socket is not valid. Contiuing */
1788 continue;
1789 }
1790
1791 /* Create channel onto application */
1792 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1793 if (ua_chan == NULL) {
1794 /* Major problem here and it's maybe the tracer or malloc() */
1795 goto error;
1796 }
1797 }
1798
1799 rcu_read_unlock();
1800
1801 return 0;
1802
1803 error:
1804 return -1;
1805 }
1806
1807 /*
1808 * Enable event for a specific session and channel on the tracer.
1809 */
1810 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1811 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1812 {
1813 int ret = 0;
1814 struct lttng_ht_iter iter, uiter;
1815 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1816 struct ust_app *app;
1817 struct ust_app_session *ua_sess;
1818 struct ust_app_channel *ua_chan;
1819 struct ust_app_event *ua_event;
1820
1821 DBG("UST app enabling event %s for all apps for session id %d",
1822 uevent->attr.name, usess->id);
1823
1824 /*
1825 * NOTE: At this point, this function is called only if the session and
1826 * channel passed are already created for all apps. and enabled on the
1827 * tracer also.
1828 */
1829
1830 rcu_read_lock();
1831
1832 /* For all registered applications */
1833 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1834 if (!app->compatible) {
1835 /*
1836 * TODO: In time, we should notice the caller of this error by
1837 * telling him that this is a version error.
1838 */
1839 continue;
1840 }
1841 ua_sess = lookup_session_by_app(usess, app);
1842 /* If ua_sess is NULL, there is a code flow error */
1843 assert(ua_sess);
1844
1845 /* Lookup channel in the ust app session */
1846 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1847 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1848 /* If the channel is not found, there is a code flow error */
1849 assert(ua_chan_node);
1850
1851 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1852
1853 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1854 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1855 if (ua_event_node == NULL) {
1856 DBG3("UST app enable event %s not found for app PID %d."
1857 "Skipping app", uevent->attr.name, app->pid);
1858 continue;
1859 }
1860 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1861
1862 ret = enable_ust_app_event(ua_sess, ua_event, app);
1863 if (ret < 0) {
1864 goto error;
1865 }
1866 }
1867
1868 error:
1869 rcu_read_unlock();
1870 return ret;
1871 }
1872
1873 /*
1874 * For a specific existing UST session and UST channel, creates the event for
1875 * all registered apps.
1876 */
1877 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1878 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1879 {
1880 int ret = 0;
1881 struct lttng_ht_iter iter, uiter;
1882 struct lttng_ht_node_str *ua_chan_node;
1883 struct ust_app *app;
1884 struct ust_app_session *ua_sess;
1885 struct ust_app_channel *ua_chan;
1886
1887 DBG("UST app creating event %s for all apps for session id %d",
1888 uevent->attr.name, usess->id);
1889
1890 rcu_read_lock();
1891
1892 /* For all registered applications */
1893 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1894 if (!app->compatible) {
1895 /*
1896 * TODO: In time, we should notice the caller of this error by
1897 * telling him that this is a version error.
1898 */
1899 continue;
1900 }
1901 ua_sess = lookup_session_by_app(usess, app);
1902 /* If ua_sess is NULL, there is a code flow error */
1903 assert(ua_sess);
1904
1905 /* Lookup channel in the ust app session */
1906 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1907 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1908 /* If the channel is not found, there is a code flow error */
1909 assert(ua_chan_node);
1910
1911 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1912
1913 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1914 if (ret < 0) {
1915 if (ret != -EEXIST) {
1916 /* Possible value at this point: -ENOMEM. If so, we stop! */
1917 break;
1918 }
1919 DBG2("UST app event %s already exist on app PID %d",
1920 uevent->attr.name, app->pid);
1921 continue;
1922 }
1923 }
1924
1925 rcu_read_unlock();
1926
1927 return ret;
1928 }
1929
1930 /*
1931 * Start tracing for a specific UST session and app.
1932 */
1933 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1934 {
1935 int ret = 0;
1936 struct lttng_ht_iter iter;
1937 struct ust_app_session *ua_sess;
1938 struct ust_app_channel *ua_chan;
1939 struct ltt_ust_stream *ustream;
1940 int consumerd_fd;
1941
1942 DBG("Starting tracing for ust app pid %d", app->pid);
1943
1944 rcu_read_lock();
1945
1946 if (!app->compatible) {
1947 goto end;
1948 }
1949
1950 ua_sess = lookup_session_by_app(usess, app);
1951 if (ua_sess == NULL) {
1952 goto error_rcu_unlock;
1953 }
1954
1955 /* Upon restart, we skip the setup, already done */
1956 if (ua_sess->started) {
1957 goto skip_setup;
1958 }
1959
1960 /* Indicate that the session has been started once */
1961 ua_sess->started = 1;
1962
1963 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1964 if (ret < 0) {
1965 goto error_rcu_unlock;
1966 }
1967
1968 /* For each channel */
1969 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1970 node.node) {
1971 /* Create all streams */
1972 while (1) {
1973 /* Create UST stream */
1974 ustream = zmalloc(sizeof(*ustream));
1975 if (ustream == NULL) {
1976 PERROR("zmalloc ust stream");
1977 goto error_rcu_unlock;
1978 }
1979
1980 ret = ustctl_create_stream(app->sock, ua_chan->obj,
1981 &ustream->obj);
1982 if (ret < 0) {
1983 /* Got all streams */
1984 free(ustream);
1985 break;
1986 }
1987 ustream->handle = ustream->obj->handle;
1988
1989 /* Order is important */
1990 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1991 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1992 ua_sess->path, ua_chan->name,
1993 ua_chan->streams.count++);
1994 if (ret < 0) {
1995 PERROR("asprintf UST create stream");
1996 /*
1997 * XXX what should we do here with the
1998 * stream ?
1999 */
2000 continue;
2001 }
2002 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
2003 ustream->pathname);
2004 }
2005 }
2006
2007 switch (app->bits_per_long) {
2008 case 64:
2009 consumerd_fd = ust_consumerd64_fd;
2010 break;
2011 case 32:
2012 consumerd_fd = ust_consumerd32_fd;
2013 break;
2014 default:
2015 ret = -EINVAL;
2016 goto error_rcu_unlock;
2017 }
2018
2019 /* Setup UST consumer socket and send fds to it */
2020 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
2021 if (ret < 0) {
2022 goto error_rcu_unlock;
2023 }
2024
2025 skip_setup:
2026 /* This start the UST tracing */
2027 ret = ustctl_start_session(app->sock, ua_sess->handle);
2028 if (ret < 0) {
2029 ERR("Error starting tracing for app pid: %d", app->pid);
2030 goto error_rcu_unlock;
2031 }
2032
2033 /* Quiescent wait after starting trace */
2034 ustctl_wait_quiescent(app->sock);
2035
2036 end:
2037 rcu_read_unlock();
2038 return 0;
2039
2040 error_rcu_unlock:
2041 rcu_read_unlock();
2042 return -1;
2043 }
2044
2045 /*
2046 * Stop tracing for a specific UST session and app.
2047 */
2048 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2049 {
2050 int ret = 0;
2051 struct lttng_ht_iter iter;
2052 struct ust_app_session *ua_sess;
2053 struct ust_app_channel *ua_chan;
2054
2055 DBG("Stopping tracing for ust app pid %d", app->pid);
2056
2057 rcu_read_lock();
2058
2059 if (!app->compatible) {
2060 goto end;
2061 }
2062
2063 ua_sess = lookup_session_by_app(usess, app);
2064 if (ua_sess == NULL) {
2065 /* Only malloc can failed so something is really wrong */
2066 goto error_rcu_unlock;
2067 }
2068
2069 /*
2070 * If started = 0, it means that stop trace has been called for a session
2071 * that was never started. This is a code flow error and should never
2072 * happen.
2073 */
2074 assert(ua_sess->started == 1);
2075
2076 /* This inhibits UST tracing */
2077 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2078 if (ret < 0) {
2079 ERR("Error stopping tracing for app pid: %d", app->pid);
2080 goto error_rcu_unlock;
2081 }
2082
2083 /* Quiescent wait after stopping trace */
2084 ustctl_wait_quiescent(app->sock);
2085
2086 /* Flushing buffers */
2087 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2088 node.node) {
2089 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2090 if (ret < 0) {
2091 ERR("UST app PID %d channel %s flush failed with ret %d",
2092 app->pid, ua_chan->name, ret);
2093 /* Continuing flushing all buffers */
2094 continue;
2095 }
2096 }
2097
2098 /* Flush all buffers before stopping */
2099 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2100 if (ret < 0) {
2101 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2102 ret);
2103 }
2104
2105 end:
2106 rcu_read_unlock();
2107 return 0;
2108
2109 error_rcu_unlock:
2110 rcu_read_unlock();
2111 return -1;
2112 }
2113
2114 /*
2115 * Destroy a specific UST session in apps.
2116 */
2117 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2118 {
2119 struct ust_app_session *ua_sess;
2120 struct lttng_ust_object_data obj;
2121 struct lttng_ht_iter iter;
2122 struct lttng_ht_node_ulong *node;
2123 int ret;
2124
2125 DBG("Destroy tracing for ust app pid %d", app->pid);
2126
2127 rcu_read_lock();
2128
2129 if (!app->compatible) {
2130 goto end;
2131 }
2132
2133 __lookup_session_by_app(usess, app, &iter);
2134 node = lttng_ht_iter_get_node_ulong(&iter);
2135 if (node == NULL) {
2136 /* Only malloc can failed so something is really wrong */
2137 goto error_rcu_unlock;
2138 }
2139 ua_sess = caa_container_of(node, struct ust_app_session, node);
2140 ret = lttng_ht_del(app->sessions, &iter);
2141 assert(!ret);
2142 obj.handle = ua_sess->handle;
2143 obj.shm_fd = -1;
2144 obj.wait_fd = -1;
2145 obj.memory_map_size = 0;
2146 ustctl_release_object(app->sock, &obj);
2147
2148 delete_ust_app_session(app->sock, ua_sess);
2149
2150 /* Quiescent wait after stopping trace */
2151 ustctl_wait_quiescent(app->sock);
2152
2153 end:
2154 rcu_read_unlock();
2155 return 0;
2156
2157 error_rcu_unlock:
2158 rcu_read_unlock();
2159 return -1;
2160 }
2161
2162 /*
2163 * Start tracing for the UST session.
2164 */
2165 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2166 {
2167 int ret = 0;
2168 struct lttng_ht_iter iter;
2169 struct ust_app *app;
2170
2171 DBG("Starting all UST traces");
2172
2173 rcu_read_lock();
2174
2175 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2176 ret = ust_app_start_trace(usess, app);
2177 if (ret < 0) {
2178 /* Continue to next apps even on error */
2179 continue;
2180 }
2181 }
2182
2183 rcu_read_unlock();
2184
2185 return 0;
2186 }
2187
2188 /*
2189 * Start tracing for the UST session.
2190 */
2191 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2192 {
2193 int ret = 0;
2194 struct lttng_ht_iter iter;
2195 struct ust_app *app;
2196
2197 DBG("Stopping all UST traces");
2198
2199 rcu_read_lock();
2200
2201 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2202 ret = ust_app_stop_trace(usess, app);
2203 if (ret < 0) {
2204 /* Continue to next apps even on error */
2205 continue;
2206 }
2207 }
2208
2209 rcu_read_unlock();
2210
2211 return 0;
2212 }
2213
2214 /*
2215 * Destroy app UST session.
2216 */
2217 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2218 {
2219 int ret = 0;
2220 struct lttng_ht_iter iter;
2221 struct ust_app *app;
2222
2223 DBG("Destroy all UST traces");
2224
2225 rcu_read_lock();
2226
2227 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2228 ret = ust_app_destroy_trace(usess, app);
2229 if (ret < 0) {
2230 /* Continue to next apps even on error */
2231 continue;
2232 }
2233 }
2234
2235 rcu_read_unlock();
2236
2237 return 0;
2238 }
2239
2240 /*
2241 * Add channels/events from UST global domain to registered apps at sock.
2242 */
2243 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2244 {
2245 int ret = 0;
2246 struct lttng_ht_iter iter, uiter, iter_ctx;
2247 struct ust_app *app;
2248 struct ust_app_session *ua_sess;
2249 struct ust_app_channel *ua_chan;
2250 struct ust_app_event *ua_event;
2251 struct ust_app_ctx *ua_ctx;
2252
2253 if (usess == NULL) {
2254 ERR("No UST session on global update. Returning");
2255 goto error;
2256 }
2257
2258 DBG2("UST app global update for app sock %d for session id %d", sock,
2259 usess->id);
2260
2261 rcu_read_lock();
2262
2263 app = find_app_by_sock(sock);
2264 if (app == NULL) {
2265 ERR("Failed to update app sock %d", sock);
2266 goto error;
2267 }
2268
2269 if (!app->compatible) {
2270 goto error;
2271 }
2272
2273 ua_sess = create_ust_app_session(usess, app);
2274 if (ua_sess == NULL) {
2275 goto error;
2276 }
2277
2278 /*
2279 * We can iterate safely here over all UST app session sicne the create ust
2280 * app session above made a shadow copy of the UST global domain from the
2281 * ltt ust session.
2282 */
2283 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2284 node.node) {
2285 ret = create_ust_channel(app, ua_sess, ua_chan);
2286 if (ret < 0) {
2287 /* FIXME: Should we quit here or continue... */
2288 continue;
2289 }
2290
2291 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2292 node.node) {
2293 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2294 if (ret < 0) {
2295 /* FIXME: Should we quit here or continue... */
2296 continue;
2297 }
2298 }
2299
2300
2301 /* For each events */
2302 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2303 node.node) {
2304 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2305 if (ret < 0) {
2306 /* FIXME: Should we quit here or continue... */
2307 continue;
2308 }
2309
2310 /* Add context on events. */
2311 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2312 ua_ctx, node.node) {
2313 ret = create_ust_event_context(ua_event, ua_ctx, app);
2314 if (ret < 0) {
2315 /* FIXME: Should we quit here or continue... */
2316 continue;
2317 }
2318 }
2319 }
2320 }
2321
2322 if (usess->start_trace) {
2323 ret = ust_app_start_trace(usess, app);
2324 if (ret < 0) {
2325 goto error;
2326 }
2327
2328 DBG2("UST trace started for app pid %d", app->pid);
2329 }
2330
2331 error:
2332 rcu_read_unlock();
2333 return;
2334 }
2335
2336 /*
2337 * Add context to a specific channel for global UST domain.
2338 */
2339 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2340 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2341 {
2342 int ret = 0;
2343 struct lttng_ht_node_str *ua_chan_node;
2344 struct lttng_ht_iter iter, uiter;
2345 struct ust_app_channel *ua_chan = NULL;
2346 struct ust_app_session *ua_sess;
2347 struct ust_app *app;
2348
2349 rcu_read_lock();
2350
2351 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2352 if (!app->compatible) {
2353 /*
2354 * TODO: In time, we should notice the caller of this error by
2355 * telling him that this is a version error.
2356 */
2357 continue;
2358 }
2359 ua_sess = lookup_session_by_app(usess, app);
2360 if (ua_sess == NULL) {
2361 continue;
2362 }
2363
2364 /* Lookup channel in the ust app session */
2365 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2366 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2367 if (ua_chan_node == NULL) {
2368 continue;
2369 }
2370 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2371 node);
2372
2373 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2374 if (ret < 0) {
2375 continue;
2376 }
2377 }
2378
2379 rcu_read_unlock();
2380 return ret;
2381 }
2382
2383 /*
2384 * Add context to a specific event in a channel for global UST domain.
2385 */
2386 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2387 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2388 struct ltt_ust_context *uctx)
2389 {
2390 int ret = 0;
2391 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2392 struct lttng_ht_iter iter, uiter;
2393 struct ust_app_session *ua_sess;
2394 struct ust_app_event *ua_event;
2395 struct ust_app_channel *ua_chan = NULL;
2396 struct ust_app *app;
2397
2398 rcu_read_lock();
2399
2400 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2401 if (!app->compatible) {
2402 /*
2403 * TODO: In time, we should notice the caller of this error by
2404 * telling him that this is a version error.
2405 */
2406 continue;
2407 }
2408 ua_sess = lookup_session_by_app(usess, app);
2409 if (ua_sess == NULL) {
2410 continue;
2411 }
2412
2413 /* Lookup channel in the ust app session */
2414 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2415 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2416 if (ua_chan_node == NULL) {
2417 continue;
2418 }
2419 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2420 node);
2421
2422 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2423 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2424 if (ua_event_node == NULL) {
2425 continue;
2426 }
2427 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2428 node);
2429
2430 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2431 if (ret < 0) {
2432 continue;
2433 }
2434 }
2435
2436 rcu_read_unlock();
2437 return ret;
2438 }
2439
2440 /*
2441 * Enable event for a channel from a UST session for a specific PID.
2442 */
2443 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2444 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2445 {
2446 int ret = 0;
2447 struct lttng_ht_iter iter;
2448 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2449 struct ust_app *app;
2450 struct ust_app_session *ua_sess;
2451 struct ust_app_channel *ua_chan;
2452 struct ust_app_event *ua_event;
2453
2454 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2455
2456 rcu_read_lock();
2457
2458 app = ust_app_find_by_pid(pid);
2459 if (app == NULL) {
2460 ERR("UST app enable event per PID %d not found", pid);
2461 ret = -1;
2462 goto error;
2463 }
2464
2465 if (!app->compatible) {
2466 ret = 0;
2467 goto error;
2468 }
2469
2470 ua_sess = lookup_session_by_app(usess, app);
2471 /* If ua_sess is NULL, there is a code flow error */
2472 assert(ua_sess);
2473
2474 /* Lookup channel in the ust app session */
2475 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2476 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2477 /* If the channel is not found, there is a code flow error */
2478 assert(ua_chan_node);
2479
2480 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2481
2482 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2483 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2484 if (ua_event_node == NULL) {
2485 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2486 if (ret < 0) {
2487 goto error;
2488 }
2489 } else {
2490 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2491
2492 ret = enable_ust_app_event(ua_sess, ua_event, app);
2493 if (ret < 0) {
2494 goto error;
2495 }
2496 }
2497
2498 error:
2499 rcu_read_unlock();
2500 return ret;
2501 }
2502
2503 /*
2504 * Disable event for a channel from a UST session for a specific PID.
2505 */
2506 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2507 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2508 {
2509 int ret = 0;
2510 struct lttng_ht_iter iter;
2511 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2512 struct ust_app *app;
2513 struct ust_app_session *ua_sess;
2514 struct ust_app_channel *ua_chan;
2515 struct ust_app_event *ua_event;
2516
2517 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2518
2519 rcu_read_lock();
2520
2521 app = ust_app_find_by_pid(pid);
2522 if (app == NULL) {
2523 ERR("UST app disable event per PID %d not found", pid);
2524 ret = -1;
2525 goto error;
2526 }
2527
2528 if (!app->compatible) {
2529 ret = 0;
2530 goto error;
2531 }
2532
2533 ua_sess = lookup_session_by_app(usess, app);
2534 /* If ua_sess is NULL, there is a code flow error */
2535 assert(ua_sess);
2536
2537 /* Lookup channel in the ust app session */
2538 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2539 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2540 if (ua_chan_node == NULL) {
2541 /* Channel does not exist, skip disabling */
2542 goto error;
2543 }
2544 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2545
2546 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2547 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2548 if (ua_event_node == NULL) {
2549 /* Event does not exist, skip disabling */
2550 goto error;
2551 }
2552 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2553
2554 ret = disable_ust_app_event(ua_sess, ua_event, app);
2555 if (ret < 0) {
2556 goto error;
2557 }
2558
2559 error:
2560 rcu_read_unlock();
2561 return ret;
2562 }
2563
2564 /*
2565 * Validate version of UST apps and set the compatible bit.
2566 */
2567 int ust_app_validate_version(int sock)
2568 {
2569 int ret;
2570 struct ust_app *app;
2571
2572 rcu_read_lock();
2573
2574 app = find_app_by_sock(sock);
2575 assert(app);
2576
2577 ret = ustctl_tracer_version(sock, &app->version);
2578 if (ret < 0) {
2579 goto error;
2580 }
2581
2582 /* Validate version */
2583 if (app->version.major > UST_APP_MAJOR_VERSION) {
2584 goto error;
2585 }
2586
2587 DBG2("UST app PID %d is compatible with major version %d "
2588 "(supporting <= %d)", app->pid, app->version.major,
2589 UST_APP_MAJOR_VERSION);
2590 app->compatible = 1;
2591 rcu_read_unlock();
2592 return 0;
2593
2594 error:
2595 DBG2("UST app PID %d is not compatible with major version %d "
2596 "(supporting <= %d)", app->pid, app->version.major,
2597 UST_APP_MAJOR_VERSION);
2598 app->compatible = 0;
2599 rcu_read_unlock();
2600 return -1;
2601 }
2602
2603 /*
2604 * Calibrate registered applications.
2605 */
2606 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2607 {
2608 int ret = 0;
2609 struct lttng_ht_iter iter;
2610 struct ust_app *app;
2611
2612 rcu_read_lock();
2613
2614 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2615 if (!app->compatible) {
2616 /*
2617 * TODO: In time, we should notice the caller of this error by
2618 * telling him that this is a version error.
2619 */
2620 continue;
2621 }
2622
2623 ret = ustctl_calibrate(app->sock, calibrate);
2624 if (ret < 0) {
2625 switch (ret) {
2626 case -ENOSYS:
2627 /* Means that it's not implemented on the tracer side. */
2628 ret = 0;
2629 break;
2630 default:
2631 /* TODO: Report error to user */
2632 DBG2("Calibrate app PID %d returned with error %d",
2633 app->pid, ret);
2634 break;
2635 }
2636 }
2637 }
2638
2639 DBG("UST app global domain calibration finished");
2640
2641 rcu_read_unlock();
2642
2643 return ret;
2644 }
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