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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 #include "fd-limit.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 lttng_fd_put(LTTNG_FD_APPS, 2);
87 free(stream->obj);
88 }
89 free(stream);
90 }
91
92 /*
93 * Delete ust app channel safely. RCU read lock must be held before calling
94 * this function.
95 */
96 static
97 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
98 {
99 int ret;
100 struct lttng_ht_iter iter;
101 struct ust_app_event *ua_event;
102 struct ust_app_ctx *ua_ctx;
103 struct ltt_ust_stream *stream, *stmp;
104
105 /* Wipe stream */
106 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
107 cds_list_del(&stream->list);
108 delete_ust_app_stream(sock, stream);
109 }
110
111 /* Wipe context */
112 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
113 ret = lttng_ht_del(ua_chan->ctx, &iter);
114 assert(!ret);
115 delete_ust_app_ctx(sock, ua_ctx);
116 }
117 lttng_ht_destroy(ua_chan->ctx);
118
119 /* Wipe events */
120 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
121 node.node) {
122 ret = lttng_ht_del(ua_chan->events, &iter);
123 assert(!ret);
124 delete_ust_app_event(sock, ua_event);
125 }
126 lttng_ht_destroy(ua_chan->events);
127
128 if (ua_chan->obj != NULL) {
129 ustctl_release_object(sock, ua_chan->obj);
130 lttng_fd_put(LTTNG_FD_APPS, 2);
131 free(ua_chan->obj);
132 }
133 free(ua_chan);
134 }
135
136 /*
137 * Delete ust app session safely. RCU read lock must be held before calling
138 * this function.
139 */
140 static
141 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
142 {
143 int ret;
144 struct lttng_ht_iter iter;
145 struct ust_app_channel *ua_chan;
146
147 if (ua_sess->metadata) {
148 if (ua_sess->metadata->stream_obj) {
149 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
150 lttng_fd_put(LTTNG_FD_APPS, 2);
151 free(ua_sess->metadata->stream_obj);
152 }
153 if (ua_sess->metadata->obj) {
154 ustctl_release_object(sock, ua_sess->metadata->obj);
155 lttng_fd_put(LTTNG_FD_APPS, 2);
156 free(ua_sess->metadata->obj);
157 }
158 trace_ust_destroy_metadata(ua_sess->metadata);
159 }
160
161 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
162 node.node) {
163 ret = lttng_ht_del(ua_sess->channels, &iter);
164 assert(!ret);
165 delete_ust_app_channel(sock, ua_chan);
166 }
167 lttng_ht_destroy(ua_sess->channels);
168
169 if (ua_sess->handle != -1) {
170 ustctl_release_handle(sock, ua_sess->handle);
171 }
172 free(ua_sess);
173 }
174
175 /*
176 * Delete a traceable application structure from the global list. Never call
177 * this function outside of a call_rcu call.
178 */
179 static
180 void delete_ust_app(struct ust_app *app)
181 {
182 int ret, sock;
183 struct lttng_ht_iter iter;
184 struct ust_app_session *ua_sess;
185
186 rcu_read_lock();
187
188 /* Delete ust app sessions info */
189 sock = app->sock;
190 app->sock = -1;
191
192 /* Wipe sessions */
193 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
194 node.node) {
195 ret = lttng_ht_del(app->sessions, &iter);
196 assert(!ret);
197 delete_ust_app_session(app->sock, ua_sess);
198 }
199 lttng_ht_destroy(app->sessions);
200
201 /*
202 * Wait until we have deleted the application from the sock hash table
203 * before closing this socket, otherwise an application could re-use the
204 * socket ID and race with the teardown, using the same hash table entry.
205 *
206 * It's OK to leave the close in call_rcu. We want it to stay unique for
207 * all RCU readers that could run concurrently with unregister app,
208 * therefore we _need_ to only close that socket after a grace period. So
209 * it should stay in this RCU callback.
210 *
211 * This close() is a very important step of the synchronization model so
212 * every modification to this function must be carefully reviewed.
213 */
214 ret = close(sock);
215 if (ret) {
216 PERROR("close");
217 }
218 lttng_fd_put(LTTNG_FD_APPS, 1);
219
220 DBG2("UST app pid %d deleted", app->pid);
221 free(app);
222
223 rcu_read_unlock();
224 }
225
226 /*
227 * URCU intermediate call to delete an UST app.
228 */
229 static
230 void delete_ust_app_rcu(struct rcu_head *head)
231 {
232 struct lttng_ht_node_ulong *node =
233 caa_container_of(head, struct lttng_ht_node_ulong, head);
234 struct ust_app *app =
235 caa_container_of(node, struct ust_app, pid_n);
236
237 DBG3("Call RCU deleting app PID %d", app->pid);
238 delete_ust_app(app);
239 }
240
241 /*
242 * Alloc new UST app session.
243 */
244 static
245 struct ust_app_session *alloc_ust_app_session(void)
246 {
247 struct ust_app_session *ua_sess;
248
249 /* Init most of the default value by allocating and zeroing */
250 ua_sess = zmalloc(sizeof(struct ust_app_session));
251 if (ua_sess == NULL) {
252 PERROR("malloc");
253 goto error;
254 }
255
256 ua_sess->handle = -1;
257 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
258
259 return ua_sess;
260
261 error:
262 return NULL;
263 }
264
265 /*
266 * Alloc new UST app channel.
267 */
268 static
269 struct ust_app_channel *alloc_ust_app_channel(char *name,
270 struct lttng_ust_channel *attr)
271 {
272 struct ust_app_channel *ua_chan;
273
274 /* Init most of the default value by allocating and zeroing */
275 ua_chan = zmalloc(sizeof(struct ust_app_channel));
276 if (ua_chan == NULL) {
277 PERROR("malloc");
278 goto error;
279 }
280
281 /* Setup channel name */
282 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
283 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
284
285 ua_chan->enabled = 1;
286 ua_chan->handle = -1;
287 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
288 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
289 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
290
291 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
292
293 /* Copy attributes */
294 if (attr) {
295 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
296 }
297
298 DBG3("UST app channel %s allocated", ua_chan->name);
299
300 return ua_chan;
301
302 error:
303 return NULL;
304 }
305
306 /*
307 * Alloc new UST app event.
308 */
309 static
310 struct ust_app_event *alloc_ust_app_event(char *name,
311 struct lttng_ust_event *attr)
312 {
313 struct ust_app_event *ua_event;
314
315 /* Init most of the default value by allocating and zeroing */
316 ua_event = zmalloc(sizeof(struct ust_app_event));
317 if (ua_event == NULL) {
318 PERROR("malloc");
319 goto error;
320 }
321
322 ua_event->enabled = 1;
323 strncpy(ua_event->name, name, sizeof(ua_event->name));
324 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
325 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
326 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
327
328 /* Copy attributes */
329 if (attr) {
330 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
331 }
332
333 DBG3("UST app event %s allocated", ua_event->name);
334
335 return ua_event;
336
337 error:
338 return NULL;
339 }
340
341 /*
342 * Alloc new UST app context.
343 */
344 static
345 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
346 {
347 struct ust_app_ctx *ua_ctx;
348
349 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
350 if (ua_ctx == NULL) {
351 goto error;
352 }
353
354 if (uctx) {
355 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
356 }
357
358 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
359
360 error:
361 return ua_ctx;
362 }
363
364 /*
365 * Find an ust_app using the sock and return it. RCU read side lock must be
366 * held before calling this helper function.
367 */
368 static
369 struct ust_app *find_app_by_sock(int sock)
370 {
371 struct lttng_ht_node_ulong *node;
372 struct lttng_ht_iter iter;
373
374 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
375 node = lttng_ht_iter_get_node_ulong(&iter);
376 if (node == NULL) {
377 DBG2("UST app find by sock %d not found", sock);
378 goto error;
379 }
380
381 return caa_container_of(node, struct ust_app, sock_n);
382
383 error:
384 return NULL;
385 }
386
387 /*
388 * Create the channel context on the tracer.
389 */
390 static
391 int create_ust_channel_context(struct ust_app_channel *ua_chan,
392 struct ust_app_ctx *ua_ctx, struct ust_app *app)
393 {
394 int ret;
395
396 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
397 ua_chan->obj, &ua_ctx->obj);
398 if (ret < 0) {
399 goto error;
400 }
401
402 ua_ctx->handle = ua_ctx->obj->handle;
403
404 DBG2("UST app context created successfully for channel %s", ua_chan->name);
405
406 error:
407 return ret;
408 }
409
410 /*
411 * Create the event context on the tracer.
412 */
413 static
414 int create_ust_event_context(struct ust_app_event *ua_event,
415 struct ust_app_ctx *ua_ctx, struct ust_app *app)
416 {
417 int ret;
418
419 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
420 ua_event->obj, &ua_ctx->obj);
421 if (ret < 0) {
422 goto error;
423 }
424
425 ua_ctx->handle = ua_ctx->obj->handle;
426
427 DBG2("UST app context created successfully for event %s", ua_event->name);
428
429 error:
430 return ret;
431 }
432
433 /*
434 * Disable the specified event on to UST tracer for the UST session.
435 */
436 static int disable_ust_event(struct ust_app *app,
437 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
438 {
439 int ret;
440
441 ret = ustctl_disable(app->sock, ua_event->obj);
442 if (ret < 0) {
443 ERR("UST app event %s disable failed for app (pid: %d) "
444 "and session handle %d with ret %d",
445 ua_event->attr.name, app->pid, ua_sess->handle, ret);
446 goto error;
447 }
448
449 DBG2("UST app event %s disabled successfully for app (pid: %d)",
450 ua_event->attr.name, app->pid);
451
452 error:
453 return ret;
454 }
455
456 /*
457 * Disable the specified channel on to UST tracer for the UST session.
458 */
459 static int disable_ust_channel(struct ust_app *app,
460 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
461 {
462 int ret;
463
464 ret = ustctl_disable(app->sock, ua_chan->obj);
465 if (ret < 0) {
466 ERR("UST app channel %s disable failed for app (pid: %d) "
467 "and session handle %d with ret %d",
468 ua_chan->name, app->pid, ua_sess->handle, ret);
469 goto error;
470 }
471
472 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
473 ua_chan->name, app->pid);
474
475 error:
476 return ret;
477 }
478
479 /*
480 * Enable the specified channel on to UST tracer for the UST session.
481 */
482 static int enable_ust_channel(struct ust_app *app,
483 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
484 {
485 int ret;
486
487 ret = ustctl_enable(app->sock, ua_chan->obj);
488 if (ret < 0) {
489 ERR("UST app channel %s enable failed for app (pid: %d) "
490 "and session handle %d with ret %d",
491 ua_chan->name, app->pid, ua_sess->handle, ret);
492 goto error;
493 }
494
495 ua_chan->enabled = 1;
496
497 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
498 ua_chan->name, app->pid);
499
500 error:
501 return ret;
502 }
503
504 /*
505 * Enable the specified event on to UST tracer for the UST session.
506 */
507 static int enable_ust_event(struct ust_app *app,
508 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
509 {
510 int ret;
511
512 ret = ustctl_enable(app->sock, ua_event->obj);
513 if (ret < 0) {
514 ERR("UST app event %s enable failed for app (pid: %d) "
515 "and session handle %d with ret %d",
516 ua_event->attr.name, app->pid, ua_sess->handle, ret);
517 goto error;
518 }
519
520 DBG2("UST app event %s enabled successfully for app (pid: %d)",
521 ua_event->attr.name, app->pid);
522
523 error:
524 return ret;
525 }
526
527 /*
528 * Open metadata onto the UST tracer for a UST session.
529 */
530 static int open_ust_metadata(struct ust_app *app,
531 struct ust_app_session *ua_sess)
532 {
533 int ret;
534 struct lttng_ust_channel_attr uattr;
535
536 uattr.overwrite = ua_sess->metadata->attr.overwrite;
537 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
538 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
539 uattr.switch_timer_interval =
540 ua_sess->metadata->attr.switch_timer_interval;
541 uattr.read_timer_interval =
542 ua_sess->metadata->attr.read_timer_interval;
543 uattr.output = ua_sess->metadata->attr.output;
544
545 /* We are going to receive 2 fds, we need to reserve them. */
546 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
547 if (ret < 0) {
548 ERR("Exhausted number of available FD upon metadata open");
549 goto error;
550 }
551 /* UST tracer metadata creation */
552 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
553 &ua_sess->metadata->obj);
554 if (ret < 0) {
555 ERR("UST app open metadata failed for app pid:%d with ret %d",
556 app->pid, ret);
557 goto error;
558 }
559
560 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
561
562 error:
563 return ret;
564 }
565
566 /*
567 * Create stream onto the UST tracer for a UST session.
568 */
569 static int create_ust_stream(struct ust_app *app,
570 struct ust_app_session *ua_sess)
571 {
572 int ret;
573
574 /* We are going to receive 2 fds, we need to reserve them. */
575 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
576 if (ret < 0) {
577 ERR("Exhausted number of available FD upon metadata stream create");
578 goto error;
579 }
580 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
581 &ua_sess->metadata->stream_obj);
582 if (ret < 0) {
583 ERR("UST create metadata stream failed");
584 goto error;
585 }
586
587 error:
588 return ret;
589 }
590
591 /*
592 * Create the specified channel onto the UST tracer for a UST session.
593 */
594 static int create_ust_channel(struct ust_app *app,
595 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
596 {
597 int ret;
598
599 /* TODO: remove cast and use lttng-ust-abi.h */
600
601 /* We are going to receive 2 fds, we need to reserve them. */
602 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
603 if (ret < 0) {
604 ERR("Exhausted number of available FD upon create channel");
605 goto error;
606 }
607 ret = ustctl_create_channel(app->sock, ua_sess->handle,
608 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
609 if (ret < 0) {
610 ERR("Creating channel %s for app (pid: %d, sock: %d) "
611 "and session handle %d with ret %d",
612 ua_chan->name, app->pid, app->sock,
613 ua_sess->handle, ret);
614 lttng_fd_put(LTTNG_FD_APPS, 2);
615 goto error;
616 }
617
618 ua_chan->handle = ua_chan->obj->handle;
619
620 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
621 ua_chan->name, app->pid, app->sock);
622
623 /* If channel is not enabled, disable it on the tracer */
624 if (!ua_chan->enabled) {
625 ret = disable_ust_channel(app, ua_sess, ua_chan);
626 if (ret < 0) {
627 goto error;
628 }
629 }
630
631 error:
632 return ret;
633 }
634
635 /*
636 * Create the specified event onto the UST tracer for a UST session.
637 */
638 static
639 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
640 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
641 {
642 int ret = 0;
643
644 /* Create UST event on tracer */
645 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
646 &ua_event->obj);
647 if (ret < 0) {
648 if (ret == -EEXIST) {
649 ret = 0;
650 goto error;
651 }
652 ERR("Error ustctl create event %s for app pid: %d with ret %d",
653 ua_event->attr.name, app->pid, ret);
654 goto error;
655 }
656
657 ua_event->handle = ua_event->obj->handle;
658
659 DBG2("UST app event %s created successfully for pid:%d",
660 ua_event->attr.name, app->pid);
661
662 /* If event not enabled, disable it on the tracer */
663 if (ua_event->enabled == 0) {
664 ret = disable_ust_event(app, ua_sess, ua_event);
665 if (ret < 0) {
666 /*
667 * If we hit an EPERM, something is wrong with our disable call. If
668 * we get an EEXIST, there is a problem on the tracer side since we
669 * just created it.
670 */
671 switch (ret) {
672 case -EPERM:
673 /* Code flow problem */
674 assert(0);
675 case -EEXIST:
676 /* It's OK for our use case. */
677 ret = 0;
678 break;
679 default:
680 break;
681 }
682 goto error;
683 }
684 }
685
686 error:
687 return ret;
688 }
689
690 /*
691 * Copy data between an UST app event and a LTT event.
692 */
693 static void shadow_copy_event(struct ust_app_event *ua_event,
694 struct ltt_ust_event *uevent)
695 {
696 struct lttng_ht_iter iter;
697 struct ltt_ust_context *uctx;
698 struct ust_app_ctx *ua_ctx;
699
700 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
701 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
702
703 ua_event->enabled = uevent->enabled;
704
705 /* Copy event attributes */
706 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
707
708 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
709 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
710 if (ua_ctx == NULL) {
711 /* malloc() failed. We should simply stop */
712 return;
713 }
714
715 lttng_ht_node_init_ulong(&ua_ctx->node,
716 (unsigned long) ua_ctx->ctx.ctx);
717 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
718 }
719 }
720
721 /*
722 * Copy data between an UST app channel and a LTT channel.
723 */
724 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
725 struct ltt_ust_channel *uchan)
726 {
727 struct lttng_ht_iter iter;
728 struct lttng_ht_node_str *ua_event_node;
729 struct ltt_ust_event *uevent;
730 struct ltt_ust_context *uctx;
731 struct ust_app_event *ua_event;
732 struct ust_app_ctx *ua_ctx;
733
734 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
735
736 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
737 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
738 /* Copy event attributes */
739 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
740
741 ua_chan->enabled = uchan->enabled;
742
743 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
744 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
745 if (ua_ctx == NULL) {
746 continue;
747 }
748 lttng_ht_node_init_ulong(&ua_ctx->node,
749 (unsigned long) ua_ctx->ctx.ctx);
750 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
751 }
752
753 /* Copy all events from ltt ust channel to ust app channel */
754 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
755 struct lttng_ht_iter uiter;
756
757 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
758 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
759 if (ua_event_node == NULL) {
760 DBG2("UST event %s not found on shadow copy channel",
761 uevent->attr.name);
762 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
763 if (ua_event == NULL) {
764 continue;
765 }
766 shadow_copy_event(ua_event, uevent);
767 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
768 }
769 }
770
771 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
772 }
773
774 /*
775 * Copy data between a UST app session and a regular LTT session.
776 */
777 static void shadow_copy_session(struct ust_app_session *ua_sess,
778 struct ltt_ust_session *usess, struct ust_app *app)
779 {
780 struct lttng_ht_node_str *ua_chan_node;
781 struct lttng_ht_iter iter;
782 struct ltt_ust_channel *uchan;
783 struct ust_app_channel *ua_chan;
784 time_t rawtime;
785 struct tm *timeinfo;
786 char datetime[16];
787 int ret;
788
789 /* Get date and time for unique app path */
790 time(&rawtime);
791 timeinfo = localtime(&rawtime);
792 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
793
794 DBG2("Shadow copy of session handle %d", ua_sess->handle);
795
796 ua_sess->id = usess->id;
797 ua_sess->uid = usess->uid;
798 ua_sess->gid = usess->gid;
799
800 ret = snprintf(ua_sess->path, PATH_MAX, "%s/%s-%d-%s", usess->pathname,
801 app->name, app->pid, datetime);
802 if (ret < 0) {
803 PERROR("asprintf UST shadow copy session");
804 /* TODO: We cannot return an error from here.. */
805 assert(0);
806 }
807
808 /* TODO: support all UST domain */
809
810 /* Iterate over all channels in global domain. */
811 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
812 uchan, node.node) {
813 struct lttng_ht_iter uiter;
814
815 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
816 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
817 if (ua_chan_node != NULL) {
818 /* Session exist. Contiuing. */
819 continue;
820 }
821
822 DBG2("Channel %s not found on shadow session copy, creating it",
823 uchan->name);
824 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
825 if (ua_chan == NULL) {
826 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
827 continue;
828 }
829
830 shadow_copy_channel(ua_chan, uchan);
831 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
832 }
833 }
834
835 /*
836 * Lookup sesison wrapper.
837 */
838 static
839 void __lookup_session_by_app(struct ltt_ust_session *usess,
840 struct ust_app *app, struct lttng_ht_iter *iter)
841 {
842 /* Get right UST app session from app */
843 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
844 }
845
846 /*
847 * Return ust app session from the app session hashtable using the UST session
848 * id.
849 */
850 static struct ust_app_session *lookup_session_by_app(
851 struct ltt_ust_session *usess, struct ust_app *app)
852 {
853 struct lttng_ht_iter iter;
854 struct lttng_ht_node_ulong *node;
855
856 __lookup_session_by_app(usess, app, &iter);
857 node = lttng_ht_iter_get_node_ulong(&iter);
858 if (node == NULL) {
859 goto error;
860 }
861
862 return caa_container_of(node, struct ust_app_session, node);
863
864 error:
865 return NULL;
866 }
867
868 /*
869 * Create a UST session onto the tracer of app and add it the session
870 * hashtable.
871 *
872 * Return ust app session or NULL on error.
873 */
874 static struct ust_app_session *create_ust_app_session(
875 struct ltt_ust_session *usess, struct ust_app *app)
876 {
877 int ret;
878 struct ust_app_session *ua_sess;
879
880 ua_sess = lookup_session_by_app(usess, app);
881 if (ua_sess == NULL) {
882 DBG2("UST app pid: %d session id %d not found, creating it",
883 app->pid, usess->id);
884 ua_sess = alloc_ust_app_session();
885 if (ua_sess == NULL) {
886 /* Only malloc can failed so something is really wrong */
887 goto end;
888 }
889 shadow_copy_session(ua_sess, usess, app);
890 }
891
892 if (ua_sess->handle == -1) {
893 ret = ustctl_create_session(app->sock);
894 if (ret < 0) {
895 ERR("Creating session for app pid %d", app->pid);
896 /* This means that the tracer is gone... */
897 ua_sess = (void*) -1UL;
898 goto error;
899 }
900
901 ua_sess->handle = ret;
902
903 /* Add ust app session to app's HT */
904 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
905 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
906
907 DBG2("UST app session created successfully with handle %d", ret);
908 }
909
910 end:
911 return ua_sess;
912
913 error:
914 delete_ust_app_session(-1, ua_sess);
915 return NULL;
916 }
917
918 /*
919 * Create a context for the channel on the tracer.
920 */
921 static
922 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
923 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
924 struct ust_app *app)
925 {
926 int ret = 0;
927 struct lttng_ht_iter iter;
928 struct lttng_ht_node_ulong *node;
929 struct ust_app_ctx *ua_ctx;
930
931 DBG2("UST app adding context to channel %s", ua_chan->name);
932
933 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
934 node = lttng_ht_iter_get_node_ulong(&iter);
935 if (node != NULL) {
936 ret = -EEXIST;
937 goto error;
938 }
939
940 ua_ctx = alloc_ust_app_ctx(uctx);
941 if (ua_ctx == NULL) {
942 /* malloc failed */
943 ret = -1;
944 goto error;
945 }
946
947 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
948 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
949
950 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
951 if (ret < 0) {
952 goto error;
953 }
954
955 error:
956 return ret;
957 }
958
959 /*
960 * Create an UST context and enable it for the event on the tracer.
961 */
962 static
963 int create_ust_app_event_context(struct ust_app_session *ua_sess,
964 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
965 struct ust_app *app)
966 {
967 int ret = 0;
968 struct lttng_ht_iter iter;
969 struct lttng_ht_node_ulong *node;
970 struct ust_app_ctx *ua_ctx;
971
972 DBG2("UST app adding context to event %s", ua_event->name);
973
974 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
975 node = lttng_ht_iter_get_node_ulong(&iter);
976 if (node != NULL) {
977 ret = -EEXIST;
978 goto error;
979 }
980
981 ua_ctx = alloc_ust_app_ctx(uctx);
982 if (ua_ctx == NULL) {
983 /* malloc failed */
984 ret = -1;
985 goto error;
986 }
987
988 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
989 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
990
991 ret = create_ust_event_context(ua_event, ua_ctx, app);
992 if (ret < 0) {
993 goto error;
994 }
995
996 error:
997 return ret;
998 }
999
1000 /*
1001 * Enable on the tracer side a ust app event for the session and channel.
1002 */
1003 static
1004 int enable_ust_app_event(struct ust_app_session *ua_sess,
1005 struct ust_app_event *ua_event, struct ust_app *app)
1006 {
1007 int ret;
1008
1009 ret = enable_ust_event(app, ua_sess, ua_event);
1010 if (ret < 0) {
1011 goto error;
1012 }
1013
1014 ua_event->enabled = 1;
1015
1016 error:
1017 return ret;
1018 }
1019
1020 /*
1021 * Disable on the tracer side a ust app event for the session and channel.
1022 */
1023 static int disable_ust_app_event(struct ust_app_session *ua_sess,
1024 struct ust_app_event *ua_event, struct ust_app *app)
1025 {
1026 int ret;
1027
1028 ret = disable_ust_event(app, ua_sess, ua_event);
1029 if (ret < 0) {
1030 goto error;
1031 }
1032
1033 ua_event->enabled = 0;
1034
1035 error:
1036 return ret;
1037 }
1038
1039 /*
1040 * Lookup ust app channel for session and disable it on the tracer side.
1041 */
1042 static
1043 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1044 struct ust_app_channel *ua_chan, struct ust_app *app)
1045 {
1046 int ret;
1047
1048 ret = disable_ust_channel(app, ua_sess, ua_chan);
1049 if (ret < 0) {
1050 goto error;
1051 }
1052
1053 ua_chan->enabled = 0;
1054
1055 error:
1056 return ret;
1057 }
1058
1059 /*
1060 * Lookup ust app channel for session and enable it on the tracer side.
1061 */
1062 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1063 struct ltt_ust_channel *uchan, struct ust_app *app)
1064 {
1065 int ret = 0;
1066 struct lttng_ht_iter iter;
1067 struct lttng_ht_node_str *ua_chan_node;
1068 struct ust_app_channel *ua_chan;
1069
1070 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1071 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1072 if (ua_chan_node == NULL) {
1073 DBG2("Unable to find channel %s in ust session id %u",
1074 uchan->name, ua_sess->id);
1075 goto error;
1076 }
1077
1078 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1079
1080 ret = enable_ust_channel(app, ua_sess, ua_chan);
1081 if (ret < 0) {
1082 goto error;
1083 }
1084
1085 error:
1086 return ret;
1087 }
1088
1089 /*
1090 * Create UST app channel and create it on the tracer.
1091 */
1092 static struct ust_app_channel *create_ust_app_channel(
1093 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1094 struct ust_app *app)
1095 {
1096 int ret = 0;
1097 struct lttng_ht_iter iter;
1098 struct lttng_ht_node_str *ua_chan_node;
1099 struct ust_app_channel *ua_chan;
1100
1101 /* Lookup channel in the ust app session */
1102 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1103 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
1104 if (ua_chan_node != NULL) {
1105 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1106 goto end;
1107 }
1108
1109 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1110 if (ua_chan == NULL) {
1111 /* Only malloc can fail here */
1112 goto error;
1113 }
1114 shadow_copy_channel(ua_chan, uchan);
1115
1116 ret = create_ust_channel(app, ua_sess, ua_chan);
1117 if (ret < 0) {
1118 /* Not found previously means that it does not exist on the tracer */
1119 assert(ret != -EEXIST);
1120 goto error;
1121 }
1122
1123 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1124
1125 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
1126 app->pid);
1127
1128 end:
1129 return ua_chan;
1130
1131 error:
1132 delete_ust_app_channel(-1, ua_chan);
1133 return NULL;
1134 }
1135
1136 /*
1137 * Create UST app event and create it on the tracer side.
1138 */
1139 static
1140 int create_ust_app_event(struct ust_app_session *ua_sess,
1141 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1142 struct ust_app *app)
1143 {
1144 int ret = 0;
1145 struct lttng_ht_iter iter;
1146 struct lttng_ht_node_str *ua_event_node;
1147 struct ust_app_event *ua_event;
1148
1149 /* Get event node */
1150 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1151 ua_event_node = lttng_ht_iter_get_node_str(&iter);
1152 if (ua_event_node != NULL) {
1153 ret = -EEXIST;
1154 goto end;
1155 }
1156
1157 /* Does not exist so create one */
1158 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1159 if (ua_event == NULL) {
1160 /* Only malloc can failed so something is really wrong */
1161 ret = -ENOMEM;
1162 goto end;
1163 }
1164 shadow_copy_event(ua_event, uevent);
1165
1166 /* Create it on the tracer side */
1167 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1168 if (ret < 0) {
1169 /* Not found previously means that it does not exist on the tracer */
1170 assert(ret != -EEXIST);
1171 goto error;
1172 }
1173
1174 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
1175
1176 DBG2("UST app create event %s for PID %d completed", ua_event->name,
1177 app->pid);
1178
1179 end:
1180 return ret;
1181
1182 error:
1183 /* Valid. Calling here is already in a read side lock */
1184 delete_ust_app_event(-1, ua_event);
1185 return ret;
1186 }
1187
1188 /*
1189 * Create UST metadata and open it on the tracer side.
1190 */
1191 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1192 char *pathname, struct ust_app *app)
1193 {
1194 int ret = 0;
1195
1196 if (ua_sess->metadata == NULL) {
1197 /* Allocate UST metadata */
1198 ua_sess->metadata = trace_ust_create_metadata(pathname);
1199 if (ua_sess->metadata == NULL) {
1200 /* malloc() failed */
1201 goto error;
1202 }
1203
1204 ret = open_ust_metadata(app, ua_sess);
1205 if (ret < 0) {
1206 DBG3("Opening metadata failed. Cleaning up memory");
1207
1208 /* Cleanup failed metadata struct */
1209 free(ua_sess->metadata);
1210 /*
1211 * This is very important because delete_ust_app_session check if
1212 * the pointer is null or not in order to delete the metadata.
1213 */
1214 ua_sess->metadata = NULL;
1215 goto error;
1216 }
1217
1218 DBG2("UST metadata opened for app pid %d", app->pid);
1219 }
1220
1221 /* Open UST metadata stream */
1222 if (ua_sess->metadata->stream_obj == NULL) {
1223 ret = create_ust_stream(app, ua_sess);
1224 if (ret < 0) {
1225 goto error;
1226 }
1227
1228 ret = run_as_mkdir(ua_sess->path, S_IRWXU | S_IRWXG,
1229 ua_sess->uid, ua_sess->gid);
1230 if (ret < 0) {
1231 PERROR("mkdir UST metadata");
1232 goto error;
1233 }
1234
1235 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1236 "%s/metadata", ua_sess->path);
1237 if (ret < 0) {
1238 PERROR("asprintf UST create stream");
1239 goto error;
1240 }
1241
1242 DBG2("UST metadata stream object created for app pid %d",
1243 app->pid);
1244 } else {
1245 ERR("Attempting to create stream without metadata opened");
1246 goto error;
1247 }
1248
1249 return 0;
1250
1251 error:
1252 return -1;
1253 }
1254
1255 /*
1256 * Return pointer to traceable apps list.
1257 */
1258 struct lttng_ht *ust_app_get_ht(void)
1259 {
1260 return ust_app_ht;
1261 }
1262
1263 /*
1264 * Return ust app pointer or NULL if not found.
1265 */
1266 struct ust_app *ust_app_find_by_pid(pid_t pid)
1267 {
1268 struct lttng_ht_node_ulong *node;
1269 struct lttng_ht_iter iter;
1270
1271 rcu_read_lock();
1272 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1273 node = lttng_ht_iter_get_node_ulong(&iter);
1274 if (node == NULL) {
1275 DBG2("UST app no found with pid %d", pid);
1276 goto error;
1277 }
1278 rcu_read_unlock();
1279
1280 DBG2("Found UST app by pid %d", pid);
1281
1282 return caa_container_of(node, struct ust_app, pid_n);
1283
1284 error:
1285 rcu_read_unlock();
1286 return NULL;
1287 }
1288
1289 /*
1290 * Using pid and uid (of the app), allocate a new ust_app struct and
1291 * add it to the global traceable app list.
1292 *
1293 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1294 * bitness is not supported.
1295 */
1296 int ust_app_register(struct ust_register_msg *msg, int sock)
1297 {
1298 struct ust_app *lta;
1299 int ret;
1300
1301 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1302 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1303 ERR("Registration failed: application \"%s\" (pid: %d) has "
1304 "%d-bit long, but no consumerd for this long size is available.\n",
1305 msg->name, msg->pid, msg->bits_per_long);
1306 ret = close(sock);
1307 if (ret) {
1308 PERROR("close");
1309 }
1310 lttng_fd_put(LTTNG_FD_APPS, 1);
1311 return -EINVAL;
1312 }
1313 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1314 ERR("Registration failed: application \"%s\" (pid: %d) has "
1315 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1316 msg->name, msg->pid, msg->major, msg->minor);
1317 ret = close(sock);
1318 if (ret) {
1319 PERROR("close");
1320 }
1321 lttng_fd_put(LTTNG_FD_APPS, 1);
1322 return -EINVAL;
1323 }
1324 lta = zmalloc(sizeof(struct ust_app));
1325 if (lta == NULL) {
1326 PERROR("malloc");
1327 return -ENOMEM;
1328 }
1329
1330 lta->ppid = msg->ppid;
1331 lta->uid = msg->uid;
1332 lta->gid = msg->gid;
1333 lta->compatible = 0; /* Not compatible until proven */
1334 lta->bits_per_long = msg->bits_per_long;
1335 lta->v_major = msg->major;
1336 lta->v_minor = msg->minor;
1337 strncpy(lta->name, msg->name, sizeof(lta->name));
1338 lta->name[16] = '\0';
1339 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1340
1341 lta->pid = msg->pid;
1342 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1343 lta->sock = sock;
1344 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
1345
1346 rcu_read_lock();
1347
1348 /*
1349 * On a re-registration, we want to kick out the previous registration of
1350 * that pid
1351 */
1352 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1353
1354 /*
1355 * The socket _should_ be unique until _we_ call close. So, a add_unique
1356 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1357 * already in the table.
1358 */
1359 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1360
1361 rcu_read_unlock();
1362
1363 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1364 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1365 lta->sock, lta->name, lta->v_major, lta->v_minor);
1366
1367 return 0;
1368 }
1369
1370 /*
1371 * Unregister app by removing it from the global traceable app list and freeing
1372 * the data struct.
1373 *
1374 * The socket is already closed at this point so no close to sock.
1375 */
1376 void ust_app_unregister(int sock)
1377 {
1378 struct ust_app *lta;
1379 struct lttng_ht_node_ulong *node;
1380 struct lttng_ht_iter iter;
1381 int ret;
1382
1383 rcu_read_lock();
1384
1385 /* Get the node reference for a call_rcu */
1386 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
1387 node = lttng_ht_iter_get_node_ulong(&iter);
1388 if (node == NULL) {
1389 ERR("Unable to find app by sock %d", sock);
1390 goto error;
1391 }
1392
1393 lta = caa_container_of(node, struct ust_app, sock_n);
1394
1395 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1396
1397 /* Remove application from PID hash table */
1398 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1399 assert(!ret);
1400
1401 /* Assign second node for deletion */
1402 iter.iter.node = &lta->pid_n.node;
1403
1404 ret = lttng_ht_del(ust_app_ht, &iter);
1405 assert(!ret);
1406
1407 /* Free memory */
1408 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1409
1410 error:
1411 rcu_read_unlock();
1412 return;
1413 }
1414
1415 /*
1416 * Return traceable_app_count
1417 */
1418 unsigned long ust_app_list_count(void)
1419 {
1420 unsigned long count;
1421
1422 rcu_read_lock();
1423 count = lttng_ht_get_count(ust_app_ht);
1424 rcu_read_unlock();
1425
1426 return count;
1427 }
1428
1429 /*
1430 * Fill events array with all events name of all registered apps.
1431 */
1432 int ust_app_list_events(struct lttng_event **events)
1433 {
1434 int ret, handle;
1435 size_t nbmem, count = 0;
1436 struct lttng_ht_iter iter;
1437 struct ust_app *app;
1438 struct lttng_event *tmp;
1439
1440 nbmem = UST_APP_EVENT_LIST_SIZE;
1441 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1442 if (tmp == NULL) {
1443 PERROR("zmalloc ust app events");
1444 ret = -ENOMEM;
1445 goto error;
1446 }
1447
1448 rcu_read_lock();
1449
1450 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1451 struct lttng_ust_tracepoint_iter uiter;
1452
1453 if (!app->compatible) {
1454 /*
1455 * TODO: In time, we should notice the caller of this error by
1456 * telling him that this is a version error.
1457 */
1458 continue;
1459 }
1460 handle = ustctl_tracepoint_list(app->sock);
1461 if (handle < 0) {
1462 ERR("UST app list events getting handle failed for app pid %d",
1463 app->pid);
1464 continue;
1465 }
1466
1467 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
1468 &uiter)) != -ENOENT) {
1469 if (count >= nbmem) {
1470 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1471 2 * nbmem);
1472 nbmem *= 2;
1473 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1474 if (tmp == NULL) {
1475 PERROR("realloc ust app events");
1476 ret = -ENOMEM;
1477 goto rcu_error;
1478 }
1479 }
1480 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1481 tmp[count].loglevel = uiter.loglevel;
1482 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1483 tmp[count].pid = app->pid;
1484 tmp[count].enabled = -1;
1485 count++;
1486 }
1487 }
1488
1489 ret = count;
1490 *events = tmp;
1491
1492 DBG2("UST app list events done (%zu events)", count);
1493
1494 rcu_error:
1495 rcu_read_unlock();
1496 error:
1497 return ret;
1498 }
1499
1500 /*
1501 * Free and clean all traceable apps of the global list.
1502 */
1503 void ust_app_clean_list(void)
1504 {
1505 int ret;
1506 struct lttng_ht_iter iter;
1507 struct lttng_ht_node_ulong *node;
1508
1509 DBG2("UST app cleaning registered apps hash table");
1510
1511 rcu_read_lock();
1512
1513 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1514 ret = lttng_ht_del(ust_app_ht, &iter);
1515 assert(!ret);
1516 call_rcu(&node->head, delete_ust_app_rcu);
1517 }
1518
1519 /* Cleanup socket hash table */
1520 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1521 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1522 assert(!ret);
1523 }
1524
1525 /* Destroy is done only when the ht is empty */
1526 lttng_ht_destroy(ust_app_ht);
1527 lttng_ht_destroy(ust_app_ht_by_sock);
1528
1529 rcu_read_unlock();
1530 }
1531
1532 /*
1533 * Init UST app hash table.
1534 */
1535 void ust_app_ht_alloc(void)
1536 {
1537 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1538 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
1539 }
1540
1541 /*
1542 * For a specific UST session, disable the channel for all registered apps.
1543 */
1544 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1545 struct ltt_ust_channel *uchan)
1546 {
1547 int ret = 0;
1548 struct lttng_ht_iter iter;
1549 struct lttng_ht_node_str *ua_chan_node;
1550 struct ust_app *app;
1551 struct ust_app_session *ua_sess;
1552 struct ust_app_channel *ua_chan;
1553
1554 if (usess == NULL || uchan == NULL) {
1555 ERR("Disabling UST global channel with NULL values");
1556 ret = -1;
1557 goto error;
1558 }
1559
1560 DBG2("UST app disabling channel %s from global domain for session id %d",
1561 uchan->name, usess->id);
1562
1563 rcu_read_lock();
1564
1565 /* For every registered applications */
1566 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1567 struct lttng_ht_iter uiter;
1568 if (!app->compatible) {
1569 /*
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1572 */
1573 continue;
1574 }
1575 ua_sess = lookup_session_by_app(usess, app);
1576 if (ua_sess == NULL) {
1577 continue;
1578 }
1579
1580 /* Get channel */
1581 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1582 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1583 /* If the session if found for the app, the channel must be there */
1584 assert(ua_chan_node);
1585
1586 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1587 /* The channel must not be already disabled */
1588 assert(ua_chan->enabled == 1);
1589
1590 /* Disable channel onto application */
1591 ret = disable_ust_app_channel(ua_sess, ua_chan, 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 * For a specific UST session, enable the channel for all registered apps.
1606 */
1607 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1608 struct ltt_ust_channel *uchan)
1609 {
1610 int ret = 0;
1611 struct lttng_ht_iter iter;
1612 struct ust_app *app;
1613 struct ust_app_session *ua_sess;
1614
1615 if (usess == NULL || uchan == NULL) {
1616 ERR("Adding UST global channel to NULL values");
1617 ret = -1;
1618 goto error;
1619 }
1620
1621 DBG2("UST app enabling channel %s to global domain for session id %d",
1622 uchan->name, usess->id);
1623
1624 rcu_read_lock();
1625
1626 /* For every registered applications */
1627 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1628 if (!app->compatible) {
1629 /*
1630 * TODO: In time, we should notice the caller of this error by
1631 * telling him that this is a version error.
1632 */
1633 continue;
1634 }
1635 ua_sess = lookup_session_by_app(usess, app);
1636 if (ua_sess == NULL) {
1637 continue;
1638 }
1639
1640 /* Enable channel onto application */
1641 ret = enable_ust_app_channel(ua_sess, uchan, app);
1642 if (ret < 0) {
1643 /* XXX: We might want to report this error at some point... */
1644 continue;
1645 }
1646 }
1647
1648 rcu_read_unlock();
1649
1650 error:
1651 return ret;
1652 }
1653
1654 /*
1655 * Disable an event in a channel and for a specific session.
1656 */
1657 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1658 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1659 {
1660 int ret = 0;
1661 struct lttng_ht_iter iter, uiter;
1662 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1663 struct ust_app *app;
1664 struct ust_app_session *ua_sess;
1665 struct ust_app_channel *ua_chan;
1666 struct ust_app_event *ua_event;
1667
1668 DBG("UST app disabling event %s for all apps in channel "
1669 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1670
1671 rcu_read_lock();
1672
1673 /* For all registered applications */
1674 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1675 if (!app->compatible) {
1676 /*
1677 * TODO: In time, we should notice the caller of this error by
1678 * telling him that this is a version error.
1679 */
1680 continue;
1681 }
1682 ua_sess = lookup_session_by_app(usess, app);
1683 if (ua_sess == NULL) {
1684 /* Next app */
1685 continue;
1686 }
1687
1688 /* Lookup channel in the ust app session */
1689 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1690 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1691 if (ua_chan_node == NULL) {
1692 DBG2("Channel %s not found in session id %d for app pid %d."
1693 "Skipping", uchan->name, usess->id, app->pid);
1694 continue;
1695 }
1696 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1697
1698 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1699 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1700 if (ua_event_node == NULL) {
1701 DBG2("Event %s not found in channel %s for app pid %d."
1702 "Skipping", uevent->attr.name, uchan->name, app->pid);
1703 continue;
1704 }
1705 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1706
1707 ret = disable_ust_app_event(ua_sess, ua_event, app);
1708 if (ret < 0) {
1709 /* XXX: Report error someday... */
1710 continue;
1711 }
1712 }
1713
1714 rcu_read_unlock();
1715
1716 return ret;
1717 }
1718
1719 /*
1720 * For a specific UST session and UST channel, the event for all
1721 * registered apps.
1722 */
1723 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1724 struct ltt_ust_channel *uchan)
1725 {
1726 int ret = 0;
1727 struct lttng_ht_iter iter, uiter;
1728 struct lttng_ht_node_str *ua_chan_node;
1729 struct ust_app *app;
1730 struct ust_app_session *ua_sess;
1731 struct ust_app_channel *ua_chan;
1732 struct ust_app_event *ua_event;
1733
1734 DBG("UST app disabling all event for all apps in channel "
1735 "%s for session id %d", uchan->name, usess->id);
1736
1737 rcu_read_lock();
1738
1739 /* For all registered applications */
1740 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1741 if (!app->compatible) {
1742 /*
1743 * TODO: In time, we should notice the caller of this error by
1744 * telling him that this is a version error.
1745 */
1746 continue;
1747 }
1748 ua_sess = lookup_session_by_app(usess, app);
1749 /* If ua_sess is NULL, there is a code flow error */
1750 assert(ua_sess);
1751
1752 /* Lookup channel in the ust app session */
1753 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1754 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1755 /* If the channel is not found, there is a code flow error */
1756 assert(ua_chan_node);
1757
1758 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1759
1760 /* Disable each events of channel */
1761 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1762 node.node) {
1763 ret = disable_ust_app_event(ua_sess, ua_event, app);
1764 if (ret < 0) {
1765 /* XXX: Report error someday... */
1766 continue;
1767 }
1768 }
1769 }
1770
1771 rcu_read_unlock();
1772
1773 return ret;
1774 }
1775
1776 /*
1777 * For a specific UST session, create the channel for all registered apps.
1778 */
1779 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1780 struct ltt_ust_channel *uchan)
1781 {
1782 struct lttng_ht_iter iter;
1783 struct ust_app *app;
1784 struct ust_app_session *ua_sess;
1785 struct ust_app_channel *ua_chan;
1786
1787 /* Very wrong code flow */
1788 assert(usess);
1789 assert(uchan);
1790
1791 DBG2("UST app adding channel %s to global domain for session id %d",
1792 uchan->name, usess->id);
1793
1794 rcu_read_lock();
1795
1796 /* For every registered applications */
1797 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1798 if (!app->compatible) {
1799 /*
1800 * TODO: In time, we should notice the caller of this error by
1801 * telling him that this is a version error.
1802 */
1803 continue;
1804 }
1805 /*
1806 * Create session on the tracer side and add it to app session HT. Note
1807 * that if session exist, it will simply return a pointer to the ust
1808 * app session.
1809 */
1810 ua_sess = create_ust_app_session(usess, app);
1811 if (ua_sess == NULL) {
1812 /* The malloc() failed. */
1813 goto error;
1814 } else if (ua_sess == (void *) -1UL) {
1815 /* The application's socket is not valid. Contiuing */
1816 continue;
1817 }
1818
1819 /* Create channel onto application */
1820 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1821 if (ua_chan == NULL) {
1822 /* Major problem here and it's maybe the tracer or malloc() */
1823 goto error;
1824 }
1825 }
1826
1827 rcu_read_unlock();
1828
1829 return 0;
1830
1831 error:
1832 return -1;
1833 }
1834
1835 /*
1836 * Enable event for a specific session and channel on the tracer.
1837 */
1838 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1839 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1840 {
1841 int ret = 0;
1842 struct lttng_ht_iter iter, uiter;
1843 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
1844 struct ust_app *app;
1845 struct ust_app_session *ua_sess;
1846 struct ust_app_channel *ua_chan;
1847 struct ust_app_event *ua_event;
1848
1849 DBG("UST app enabling event %s for all apps for session id %d",
1850 uevent->attr.name, usess->id);
1851
1852 /*
1853 * NOTE: At this point, this function is called only if the session and
1854 * channel passed are already created for all apps. and enabled on the
1855 * tracer also.
1856 */
1857
1858 rcu_read_lock();
1859
1860 /* For all registered applications */
1861 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1862 if (!app->compatible) {
1863 /*
1864 * TODO: In time, we should notice the caller of this error by
1865 * telling him that this is a version error.
1866 */
1867 continue;
1868 }
1869 ua_sess = lookup_session_by_app(usess, app);
1870 /* If ua_sess is NULL, there is a code flow error */
1871 assert(ua_sess);
1872
1873 /* Lookup channel in the ust app session */
1874 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1875 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1876 /* If the channel is not found, there is a code flow error */
1877 assert(ua_chan_node);
1878
1879 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1880
1881 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
1882 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
1883 if (ua_event_node == NULL) {
1884 DBG3("UST app enable event %s not found for app PID %d."
1885 "Skipping app", uevent->attr.name, app->pid);
1886 continue;
1887 }
1888 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1889
1890 ret = enable_ust_app_event(ua_sess, ua_event, app);
1891 if (ret < 0) {
1892 goto error;
1893 }
1894 }
1895
1896 error:
1897 rcu_read_unlock();
1898 return ret;
1899 }
1900
1901 /*
1902 * For a specific existing UST session and UST channel, creates the event for
1903 * all registered apps.
1904 */
1905 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1906 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1907 {
1908 int ret = 0;
1909 struct lttng_ht_iter iter, uiter;
1910 struct lttng_ht_node_str *ua_chan_node;
1911 struct ust_app *app;
1912 struct ust_app_session *ua_sess;
1913 struct ust_app_channel *ua_chan;
1914
1915 DBG("UST app creating event %s for all apps for session id %d",
1916 uevent->attr.name, usess->id);
1917
1918 rcu_read_lock();
1919
1920 /* For all registered applications */
1921 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1922 if (!app->compatible) {
1923 /*
1924 * TODO: In time, we should notice the caller of this error by
1925 * telling him that this is a version error.
1926 */
1927 continue;
1928 }
1929 ua_sess = lookup_session_by_app(usess, app);
1930 /* If ua_sess is NULL, there is a code flow error */
1931 assert(ua_sess);
1932
1933 /* Lookup channel in the ust app session */
1934 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1935 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
1936 /* If the channel is not found, there is a code flow error */
1937 assert(ua_chan_node);
1938
1939 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1940
1941 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1942 if (ret < 0) {
1943 if (ret != -EEXIST) {
1944 /* Possible value at this point: -ENOMEM. If so, we stop! */
1945 break;
1946 }
1947 DBG2("UST app event %s already exist on app PID %d",
1948 uevent->attr.name, app->pid);
1949 continue;
1950 }
1951 }
1952
1953 rcu_read_unlock();
1954
1955 return ret;
1956 }
1957
1958 /*
1959 * Start tracing for a specific UST session and app.
1960 */
1961 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1962 {
1963 int ret = 0;
1964 struct lttng_ht_iter iter;
1965 struct ust_app_session *ua_sess;
1966 struct ust_app_channel *ua_chan;
1967 struct ltt_ust_stream *ustream;
1968 int consumerd_fd;
1969
1970 DBG("Starting tracing for ust app pid %d", app->pid);
1971
1972 rcu_read_lock();
1973
1974 if (!app->compatible) {
1975 goto end;
1976 }
1977
1978 ua_sess = lookup_session_by_app(usess, app);
1979 if (ua_sess == NULL) {
1980 goto error_rcu_unlock;
1981 }
1982
1983 /* Upon restart, we skip the setup, already done */
1984 if (ua_sess->started) {
1985 goto skip_setup;
1986 }
1987
1988 /* Indicate that the session has been started once */
1989 ua_sess->started = 1;
1990
1991 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1992 if (ret < 0) {
1993 goto error_rcu_unlock;
1994 }
1995
1996 /* For each channel */
1997 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
1998 node.node) {
1999 /* Create all streams */
2000 while (1) {
2001 /* Create UST stream */
2002 ustream = zmalloc(sizeof(*ustream));
2003 if (ustream == NULL) {
2004 PERROR("zmalloc ust stream");
2005 goto error_rcu_unlock;
2006 }
2007
2008 /* We are going to receive 2 fds, we need to reserve them. */
2009 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2010 if (ret < 0) {
2011 ERR("Exhausted number of available FD upon stream create");
2012 free(ustream);
2013 goto error_rcu_unlock;
2014 }
2015 ret = ustctl_create_stream(app->sock, ua_chan->obj,
2016 &ustream->obj);
2017 if (ret < 0) {
2018 /* Got all streams */
2019 lttng_fd_put(LTTNG_FD_APPS, 2);
2020 free(ustream);
2021 break;
2022 }
2023 ustream->handle = ustream->obj->handle;
2024
2025 /* Order is important */
2026 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
2027 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
2028 ua_sess->path, ua_chan->name,
2029 ua_chan->streams.count++);
2030 if (ret < 0) {
2031 PERROR("asprintf UST create stream");
2032 /*
2033 * XXX what should we do here with the
2034 * stream ?
2035 */
2036 continue;
2037 }
2038 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
2039 ustream->pathname);
2040 }
2041 }
2042
2043 switch (app->bits_per_long) {
2044 case 64:
2045 consumerd_fd = ust_consumerd64_fd;
2046 break;
2047 case 32:
2048 consumerd_fd = ust_consumerd32_fd;
2049 break;
2050 default:
2051 ret = -EINVAL;
2052 goto error_rcu_unlock;
2053 }
2054
2055 /* Setup UST consumer socket and send fds to it */
2056 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
2057 if (ret < 0) {
2058 goto error_rcu_unlock;
2059 }
2060
2061 skip_setup:
2062 /* This start the UST tracing */
2063 ret = ustctl_start_session(app->sock, ua_sess->handle);
2064 if (ret < 0) {
2065 ERR("Error starting tracing for app pid: %d", app->pid);
2066 goto error_rcu_unlock;
2067 }
2068
2069 /* Quiescent wait after starting trace */
2070 ustctl_wait_quiescent(app->sock);
2071
2072 end:
2073 rcu_read_unlock();
2074 return 0;
2075
2076 error_rcu_unlock:
2077 rcu_read_unlock();
2078 return -1;
2079 }
2080
2081 /*
2082 * Stop tracing for a specific UST session and app.
2083 */
2084 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2085 {
2086 int ret = 0;
2087 struct lttng_ht_iter iter;
2088 struct ust_app_session *ua_sess;
2089 struct ust_app_channel *ua_chan;
2090
2091 DBG("Stopping tracing for ust app pid %d", app->pid);
2092
2093 rcu_read_lock();
2094
2095 if (!app->compatible) {
2096 goto end;
2097 }
2098
2099 ua_sess = lookup_session_by_app(usess, app);
2100 if (ua_sess == NULL) {
2101 /* Only malloc can failed so something is really wrong */
2102 goto error_rcu_unlock;
2103 }
2104
2105 /*
2106 * If started = 0, it means that stop trace has been called for a session
2107 * that was never started. This is a code flow error and should never
2108 * happen.
2109 */
2110 assert(ua_sess->started == 1);
2111
2112 /* This inhibits UST tracing */
2113 ret = ustctl_stop_session(app->sock, ua_sess->handle);
2114 if (ret < 0) {
2115 ERR("Error stopping tracing for app pid: %d", app->pid);
2116 goto error_rcu_unlock;
2117 }
2118
2119 /* Quiescent wait after stopping trace */
2120 ustctl_wait_quiescent(app->sock);
2121
2122 /* Flushing buffers */
2123 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2124 node.node) {
2125 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
2126 if (ret < 0) {
2127 ERR("UST app PID %d channel %s flush failed with ret %d",
2128 app->pid, ua_chan->name, ret);
2129 /* Continuing flushing all buffers */
2130 continue;
2131 }
2132 }
2133
2134 /* Flush all buffers before stopping */
2135 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
2136 if (ret < 0) {
2137 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
2138 ret);
2139 }
2140
2141 end:
2142 rcu_read_unlock();
2143 return 0;
2144
2145 error_rcu_unlock:
2146 rcu_read_unlock();
2147 return -1;
2148 }
2149
2150 /*
2151 * Destroy a specific UST session in apps.
2152 */
2153 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2154 {
2155 struct ust_app_session *ua_sess;
2156 struct lttng_ust_object_data obj;
2157 struct lttng_ht_iter iter;
2158 struct lttng_ht_node_ulong *node;
2159 int ret;
2160
2161 DBG("Destroy tracing for ust app pid %d", app->pid);
2162
2163 rcu_read_lock();
2164
2165 if (!app->compatible) {
2166 goto end;
2167 }
2168
2169 __lookup_session_by_app(usess, app, &iter);
2170 node = lttng_ht_iter_get_node_ulong(&iter);
2171 if (node == NULL) {
2172 /* Only malloc can failed so something is really wrong */
2173 goto error_rcu_unlock;
2174 }
2175 ua_sess = caa_container_of(node, struct ust_app_session, node);
2176 ret = lttng_ht_del(app->sessions, &iter);
2177 assert(!ret);
2178 obj.handle = ua_sess->handle;
2179 obj.shm_fd = -1;
2180 obj.wait_fd = -1;
2181 obj.memory_map_size = 0;
2182 ustctl_release_object(app->sock, &obj);
2183
2184 delete_ust_app_session(app->sock, ua_sess);
2185
2186 /* Quiescent wait after stopping trace */
2187 ustctl_wait_quiescent(app->sock);
2188
2189 end:
2190 rcu_read_unlock();
2191 return 0;
2192
2193 error_rcu_unlock:
2194 rcu_read_unlock();
2195 return -1;
2196 }
2197
2198 /*
2199 * Start tracing for the UST session.
2200 */
2201 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2202 {
2203 int ret = 0;
2204 struct lttng_ht_iter iter;
2205 struct ust_app *app;
2206
2207 DBG("Starting all UST traces");
2208
2209 rcu_read_lock();
2210
2211 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2212 ret = ust_app_start_trace(usess, app);
2213 if (ret < 0) {
2214 /* Continue to next apps even on error */
2215 continue;
2216 }
2217 }
2218
2219 rcu_read_unlock();
2220
2221 return 0;
2222 }
2223
2224 /*
2225 * Start tracing for the UST session.
2226 */
2227 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2228 {
2229 int ret = 0;
2230 struct lttng_ht_iter iter;
2231 struct ust_app *app;
2232
2233 DBG("Stopping all UST traces");
2234
2235 rcu_read_lock();
2236
2237 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2238 ret = ust_app_stop_trace(usess, app);
2239 if (ret < 0) {
2240 /* Continue to next apps even on error */
2241 continue;
2242 }
2243 }
2244
2245 rcu_read_unlock();
2246
2247 return 0;
2248 }
2249
2250 /*
2251 * Destroy app UST session.
2252 */
2253 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2254 {
2255 int ret = 0;
2256 struct lttng_ht_iter iter;
2257 struct ust_app *app;
2258
2259 DBG("Destroy all UST traces");
2260
2261 rcu_read_lock();
2262
2263 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2264 ret = ust_app_destroy_trace(usess, app);
2265 if (ret < 0) {
2266 /* Continue to next apps even on error */
2267 continue;
2268 }
2269 }
2270
2271 rcu_read_unlock();
2272
2273 return 0;
2274 }
2275
2276 /*
2277 * Add channels/events from UST global domain to registered apps at sock.
2278 */
2279 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2280 {
2281 int ret = 0;
2282 struct lttng_ht_iter iter, uiter, iter_ctx;
2283 struct ust_app *app;
2284 struct ust_app_session *ua_sess;
2285 struct ust_app_channel *ua_chan;
2286 struct ust_app_event *ua_event;
2287 struct ust_app_ctx *ua_ctx;
2288
2289 if (usess == NULL) {
2290 ERR("No UST session on global update. Returning");
2291 goto error;
2292 }
2293
2294 DBG2("UST app global update for app sock %d for session id %d", sock,
2295 usess->id);
2296
2297 rcu_read_lock();
2298
2299 app = find_app_by_sock(sock);
2300 if (app == NULL) {
2301 ERR("Failed to update app sock %d", sock);
2302 goto error;
2303 }
2304
2305 if (!app->compatible) {
2306 goto error;
2307 }
2308
2309 ua_sess = create_ust_app_session(usess, app);
2310 if (ua_sess == NULL) {
2311 goto error;
2312 }
2313
2314 /*
2315 * We can iterate safely here over all UST app session sicne the create ust
2316 * app session above made a shadow copy of the UST global domain from the
2317 * ltt ust session.
2318 */
2319 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2320 node.node) {
2321 ret = create_ust_channel(app, ua_sess, ua_chan);
2322 if (ret < 0) {
2323 /* FIXME: Should we quit here or continue... */
2324 continue;
2325 }
2326
2327 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2328 node.node) {
2329 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2330 if (ret < 0) {
2331 /* FIXME: Should we quit here or continue... */
2332 continue;
2333 }
2334 }
2335
2336
2337 /* For each events */
2338 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2339 node.node) {
2340 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2341 if (ret < 0) {
2342 /* FIXME: Should we quit here or continue... */
2343 continue;
2344 }
2345
2346 /* Add context on events. */
2347 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2348 ua_ctx, node.node) {
2349 ret = create_ust_event_context(ua_event, ua_ctx, app);
2350 if (ret < 0) {
2351 /* FIXME: Should we quit here or continue... */
2352 continue;
2353 }
2354 }
2355 }
2356 }
2357
2358 if (usess->start_trace) {
2359 ret = ust_app_start_trace(usess, app);
2360 if (ret < 0) {
2361 goto error;
2362 }
2363
2364 DBG2("UST trace started for app pid %d", app->pid);
2365 }
2366
2367 error:
2368 rcu_read_unlock();
2369 return;
2370 }
2371
2372 /*
2373 * Add context to a specific channel for global UST domain.
2374 */
2375 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2376 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2377 {
2378 int ret = 0;
2379 struct lttng_ht_node_str *ua_chan_node;
2380 struct lttng_ht_iter iter, uiter;
2381 struct ust_app_channel *ua_chan = NULL;
2382 struct ust_app_session *ua_sess;
2383 struct ust_app *app;
2384
2385 rcu_read_lock();
2386
2387 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2388 if (!app->compatible) {
2389 /*
2390 * TODO: In time, we should notice the caller of this error by
2391 * telling him that this is a version error.
2392 */
2393 continue;
2394 }
2395 ua_sess = lookup_session_by_app(usess, app);
2396 if (ua_sess == NULL) {
2397 continue;
2398 }
2399
2400 /* Lookup channel in the ust app session */
2401 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2402 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2403 if (ua_chan_node == NULL) {
2404 continue;
2405 }
2406 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2407 node);
2408
2409 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2410 if (ret < 0) {
2411 continue;
2412 }
2413 }
2414
2415 rcu_read_unlock();
2416 return ret;
2417 }
2418
2419 /*
2420 * Add context to a specific event in a channel for global UST domain.
2421 */
2422 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2423 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2424 struct ltt_ust_context *uctx)
2425 {
2426 int ret = 0;
2427 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2428 struct lttng_ht_iter iter, uiter;
2429 struct ust_app_session *ua_sess;
2430 struct ust_app_event *ua_event;
2431 struct ust_app_channel *ua_chan = NULL;
2432 struct ust_app *app;
2433
2434 rcu_read_lock();
2435
2436 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2437 if (!app->compatible) {
2438 /*
2439 * TODO: In time, we should notice the caller of this error by
2440 * telling him that this is a version error.
2441 */
2442 continue;
2443 }
2444 ua_sess = lookup_session_by_app(usess, app);
2445 if (ua_sess == NULL) {
2446 continue;
2447 }
2448
2449 /* Lookup channel in the ust app session */
2450 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2451 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2452 if (ua_chan_node == NULL) {
2453 continue;
2454 }
2455 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2456 node);
2457
2458 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2459 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2460 if (ua_event_node == NULL) {
2461 continue;
2462 }
2463 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2464 node);
2465
2466 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2467 if (ret < 0) {
2468 continue;
2469 }
2470 }
2471
2472 rcu_read_unlock();
2473 return ret;
2474 }
2475
2476 /*
2477 * Enable event for a channel from a UST session for a specific PID.
2478 */
2479 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2480 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2481 {
2482 int ret = 0;
2483 struct lttng_ht_iter iter;
2484 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2485 struct ust_app *app;
2486 struct ust_app_session *ua_sess;
2487 struct ust_app_channel *ua_chan;
2488 struct ust_app_event *ua_event;
2489
2490 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2491
2492 rcu_read_lock();
2493
2494 app = ust_app_find_by_pid(pid);
2495 if (app == NULL) {
2496 ERR("UST app enable event per PID %d not found", pid);
2497 ret = -1;
2498 goto error;
2499 }
2500
2501 if (!app->compatible) {
2502 ret = 0;
2503 goto error;
2504 }
2505
2506 ua_sess = lookup_session_by_app(usess, app);
2507 /* If ua_sess is NULL, there is a code flow error */
2508 assert(ua_sess);
2509
2510 /* Lookup channel in the ust app session */
2511 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2512 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2513 /* If the channel is not found, there is a code flow error */
2514 assert(ua_chan_node);
2515
2516 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2517
2518 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2519 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2520 if (ua_event_node == NULL) {
2521 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2522 if (ret < 0) {
2523 goto error;
2524 }
2525 } else {
2526 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2527
2528 ret = enable_ust_app_event(ua_sess, ua_event, app);
2529 if (ret < 0) {
2530 goto error;
2531 }
2532 }
2533
2534 error:
2535 rcu_read_unlock();
2536 return ret;
2537 }
2538
2539 /*
2540 * Disable event for a channel from a UST session for a specific PID.
2541 */
2542 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2543 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2544 {
2545 int ret = 0;
2546 struct lttng_ht_iter iter;
2547 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2548 struct ust_app *app;
2549 struct ust_app_session *ua_sess;
2550 struct ust_app_channel *ua_chan;
2551 struct ust_app_event *ua_event;
2552
2553 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2554
2555 rcu_read_lock();
2556
2557 app = ust_app_find_by_pid(pid);
2558 if (app == NULL) {
2559 ERR("UST app disable event per PID %d not found", pid);
2560 ret = -1;
2561 goto error;
2562 }
2563
2564 if (!app->compatible) {
2565 ret = 0;
2566 goto error;
2567 }
2568
2569 ua_sess = lookup_session_by_app(usess, app);
2570 /* If ua_sess is NULL, there is a code flow error */
2571 assert(ua_sess);
2572
2573 /* Lookup channel in the ust app session */
2574 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2575 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
2576 if (ua_chan_node == NULL) {
2577 /* Channel does not exist, skip disabling */
2578 goto error;
2579 }
2580 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2581
2582 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2583 ua_event_node = lttng_ht_iter_get_node_str(&iter);
2584 if (ua_event_node == NULL) {
2585 /* Event does not exist, skip disabling */
2586 goto error;
2587 }
2588 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2589
2590 ret = disable_ust_app_event(ua_sess, ua_event, app);
2591 if (ret < 0) {
2592 goto error;
2593 }
2594
2595 error:
2596 rcu_read_unlock();
2597 return ret;
2598 }
2599
2600 /*
2601 * Validate version of UST apps and set the compatible bit.
2602 */
2603 int ust_app_validate_version(int sock)
2604 {
2605 int ret;
2606 struct ust_app *app;
2607
2608 rcu_read_lock();
2609
2610 app = find_app_by_sock(sock);
2611 assert(app);
2612
2613 ret = ustctl_tracer_version(sock, &app->version);
2614 if (ret < 0) {
2615 goto error;
2616 }
2617
2618 /* Validate version */
2619 if (app->version.major > UST_APP_MAJOR_VERSION) {
2620 goto error;
2621 }
2622
2623 DBG2("UST app PID %d is compatible with major version %d "
2624 "(supporting <= %d)", app->pid, app->version.major,
2625 UST_APP_MAJOR_VERSION);
2626 app->compatible = 1;
2627 rcu_read_unlock();
2628 return 0;
2629
2630 error:
2631 DBG2("UST app PID %d is not compatible with major version %d "
2632 "(supporting <= %d)", app->pid, app->version.major,
2633 UST_APP_MAJOR_VERSION);
2634 app->compatible = 0;
2635 rcu_read_unlock();
2636 return -1;
2637 }
2638
2639 /*
2640 * Calibrate registered applications.
2641 */
2642 int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2643 {
2644 int ret = 0;
2645 struct lttng_ht_iter iter;
2646 struct ust_app *app;
2647
2648 rcu_read_lock();
2649
2650 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2651 if (!app->compatible) {
2652 /*
2653 * TODO: In time, we should notice the caller of this error by
2654 * telling him that this is a version error.
2655 */
2656 continue;
2657 }
2658
2659 ret = ustctl_calibrate(app->sock, calibrate);
2660 if (ret < 0) {
2661 switch (ret) {
2662 case -ENOSYS:
2663 /* Means that it's not implemented on the tracer side. */
2664 ret = 0;
2665 break;
2666 default:
2667 /* TODO: Report error to user */
2668 DBG2("Calibrate app PID %d returned with error %d",
2669 app->pid, ret);
2670 break;
2671 }
2672 }
2673 }
2674
2675 DBG("UST app global domain calibration finished");
2676
2677 rcu_read_unlock();
2678
2679 return ret;
2680 }
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