Add missing rcu read lock
[lttng-tools.git] / lttng-sessiond / ust-app.c
CommitLineData
91d76f53
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
82a3637f
DG
6 * as published by the Free Software Foundation; only version 2
7 * of the License.
91d76f53
DG
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19#define _GNU_SOURCE
20#include <errno.h>
21#include <pthread.h>
22#include <stdio.h>
23#include <stdlib.h>
099e26bd 24#include <string.h>
aba8e916
DG
25#include <sys/stat.h>
26#include <sys/types.h>
099e26bd 27#include <unistd.h>
91d76f53 28
0df502fd 29#include <urcu/compiler.h>
1e307fab 30#include <lttngerr.h>
48842b30 31#include <lttng-share.h>
1e307fab 32
f6a9efaa 33#include "hashtable.h"
56fff090 34#include "ust-app.h"
48842b30 35#include "ust-consumer.h"
d80a6244
DG
36#include "ust-ctl.h"
37
55cc08a6
DG
38/*
39 * Delete ust context safely. RCU read lock must be held before calling
40 * this function.
41 */
42static
43void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
44{
45 if (ua_ctx->obj) {
46 ustctl_release_object(sock, ua_ctx->obj);
47 free(ua_ctx->obj);
48 }
49 free(ua_ctx);
50}
51
d80a6244
DG
52/*
53 * Delete ust app event safely. RCU read lock must be held before calling
54 * this function.
55 */
8b366481
DG
56static
57void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 58{
55cc08a6
DG
59 int ret;
60 struct cds_lfht_iter iter;
61 struct ust_app_ctx *ua_ctx;
62
63 cds_lfht_for_each_entry(ua_event->ctx, &iter, ua_ctx, node) {
64 ret = hashtable_del(ua_event->ctx, &iter);
65 assert(!ret);
66 delete_ust_app_ctx(sock, ua_ctx);
67 }
68 ret = hashtable_destroy(ua_event->ctx);
69 assert(!ret);
d80a6244 70
edb67388
DG
71 if (ua_event->obj != NULL) {
72 ustctl_release_object(sock, ua_event->obj);
73 free(ua_event->obj);
74 }
d80a6244
DG
75 free(ua_event);
76}
77
78/*
79 * Delete ust app stream safely. RCU read lock must be held before calling
80 * this function.
81 */
8b366481
DG
82static
83void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 84{
8b366481
DG
85 if (stream->obj) {
86 ustctl_release_object(sock, stream->obj);
87 free(stream->obj);
88 }
84cd17c6 89 free(stream);
d80a6244
DG
90}
91
92/*
93 * Delete ust app channel safely. RCU read lock must be held before calling
94 * this function.
95 */
8b366481
DG
96static
97void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
d80a6244
DG
98{
99 int ret;
100 struct cds_lfht_iter iter;
101 struct ust_app_event *ua_event;
55cc08a6 102 struct ust_app_ctx *ua_ctx;
d80a6244
DG
103 struct ltt_ust_stream *stream, *stmp;
104
55cc08a6 105 /* Wipe stream */
d80a6244 106 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 107 cds_list_del(&stream->list);
d80a6244
DG
108 delete_ust_app_stream(sock, stream);
109 }
110
55cc08a6
DG
111 /* Wipe context */
112 cds_lfht_for_each_entry(ua_chan->ctx, &iter, ua_ctx, node) {
113 ret = hashtable_del(ua_chan->ctx, &iter);
114 assert(!ret);
115 delete_ust_app_ctx(sock, ua_ctx);
116 }
117 ret = hashtable_destroy(ua_chan->ctx);
118 assert(!ret);
d80a6244 119
55cc08a6 120 /* Wipe events */
d80a6244 121 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
525b0740
MD
122 ret = hashtable_del(ua_chan->events, &iter);
123 assert(!ret);
d80a6244
DG
124 delete_ust_app_event(sock, ua_event);
125 }
d80a6244 126 ret = hashtable_destroy(ua_chan->events);
55cc08a6 127 assert(!ret);
edb67388
DG
128
129 if (ua_chan->obj != NULL) {
130 ustctl_release_object(sock, ua_chan->obj);
131 free(ua_chan->obj);
132 }
84cd17c6 133 free(ua_chan);
d80a6244
DG
134}
135
136/*
137 * Delete ust app session safely. RCU read lock must be held before calling
138 * this function.
139 */
8b366481
DG
140static
141void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
d80a6244
DG
142{
143 int ret;
144 struct cds_lfht_iter iter;
145 struct ust_app_channel *ua_chan;
146
147 if (ua_sess->metadata) {
8b366481
DG
148 if (ua_sess->metadata->stream_obj) {
149 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
150 free(ua_sess->metadata->stream_obj);
151 }
152 if (ua_sess->metadata->obj) {
153 ustctl_release_object(sock, ua_sess->metadata->obj);
154 free(ua_sess->metadata->obj);
155 }
d80a6244
DG
156 }
157
158 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
525b0740
MD
159 ret = hashtable_del(ua_sess->channels, &iter);
160 assert(!ret);
d80a6244
DG
161 delete_ust_app_channel(sock, ua_chan);
162 }
d80a6244 163 ret = hashtable_destroy(ua_sess->channels);
8b366481 164 assert(!ret);
d80a6244 165
8b366481 166 free(ua_sess);
d80a6244 167}
91d76f53
DG
168
169/*
284d8f55
DG
170 * Delete a traceable application structure from the global list. Never call
171 * this function outside of a call_rcu call.
91d76f53 172 */
8b366481
DG
173static
174void delete_ust_app(struct ust_app *app)
91d76f53 175{
8b366481 176 int ret, sock;
f6a9efaa
DG
177 struct cds_lfht_node *node;
178 struct cds_lfht_iter iter;
284d8f55 179 struct ust_app_session *ua_sess;
44d3bd01 180
f6a9efaa 181 rcu_read_lock();
44d3bd01 182
f6a9efaa
DG
183 /* Remove from key hash table */
184 node = hashtable_lookup(ust_app_sock_key_map,
284d8f55 185 (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter);
f6a9efaa 186 if (node == NULL) {
284d8f55
DG
187 /* Not suppose to happen */
188 ERR("UST app key %d not found in key hash table", app->key.sock);
d80a6244 189 goto end;
284d8f55
DG
190 }
191
192 ret = hashtable_del(ust_app_sock_key_map, &iter);
193 if (ret) {
194 ERR("UST app unable to delete app sock %d from key hash table",
195 app->key.sock);
f6a9efaa 196 } else {
284d8f55
DG
197 DBG2("UST app pair sock %d key %d deleted",
198 app->key.sock, app->key.pid);
f6a9efaa
DG
199 }
200
d80a6244
DG
201 /* Socket is already closed at this point */
202
203 /* Delete ust app sessions info */
6414a713
MD
204 sock = app->key.sock;
205 app->key.sock = -1;
d80a6244 206
8b366481 207 /* Wipe sessions */
284d8f55 208 cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
525b0740
MD
209 ret = hashtable_del(app->sessions, &iter);
210 assert(!ret);
284d8f55 211 delete_ust_app_session(app->key.sock, ua_sess);
d80a6244 212 }
284d8f55 213 ret = hashtable_destroy(app->sessions);
8b366481 214 assert(!ret);
d80a6244 215
6414a713
MD
216 /*
217 * Wait until we have removed the key from the sock hash table
218 * before closing this socket, otherwise an application could
219 * re-use the socket ID and race with the teardown, using the
220 * same hash table entry.
221 */
222 close(sock);
d80a6244 223
284d8f55
DG
224 DBG2("UST app pid %d deleted", app->key.pid);
225 free(app);
d80a6244 226end:
f6a9efaa 227 rcu_read_unlock();
099e26bd
DG
228}
229
230/*
f6a9efaa 231 * URCU intermediate call to delete an UST app.
099e26bd 232 */
8b366481
DG
233static
234void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 235{
f6a9efaa
DG
236 struct cds_lfht_node *node =
237 caa_container_of(head, struct cds_lfht_node, head);
238 struct ust_app *app =
239 caa_container_of(node, struct ust_app, node);
240
241 delete_ust_app(app);
099e26bd
DG
242}
243
8b366481
DG
244/*
245 * Alloc new UST app session.
246 */
247static
248struct ust_app_session *alloc_ust_app_session(void)
249{
250 struct ust_app_session *ua_sess;
251
252 /* Init most of the default value by allocating and zeroing */
253 ua_sess = zmalloc(sizeof(struct ust_app_session));
254 if (ua_sess == NULL) {
255 PERROR("malloc");
256 goto error;
257 }
258
259 ua_sess->handle = -1;
260 ua_sess->channels = hashtable_new_str(0);
261
262 return ua_sess;
263
264error:
265 return NULL;
266}
267
268/*
269 * Alloc new UST app channel.
270 */
271static
272struct ust_app_channel *alloc_ust_app_channel(char *name,
273 struct lttng_ust_channel *attr)
274{
275 struct ust_app_channel *ua_chan;
276
277 /* Init most of the default value by allocating and zeroing */
278 ua_chan = zmalloc(sizeof(struct ust_app_channel));
279 if (ua_chan == NULL) {
280 PERROR("malloc");
281 goto error;
282 }
283
284 /* Setup channel name */
285 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
286 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
287
288 ua_chan->enabled = 1;
289 ua_chan->handle = -1;
290 ua_chan->ctx = hashtable_new(0);
291 ua_chan->events = hashtable_new_str(0);
292 hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
293 strlen(ua_chan->name));
294
295 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
296
297 /* Copy attributes */
298 if (attr) {
299 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
300 }
301
302 DBG3("UST app channel %s allocated", ua_chan->name);
303
304 return ua_chan;
305
306error:
307 return NULL;
308}
309
310/*
311 * Alloc new UST app event.
312 */
313static
314struct ust_app_event *alloc_ust_app_event(char *name,
315 struct lttng_ust_event *attr)
316{
317 struct ust_app_event *ua_event;
318
319 /* Init most of the default value by allocating and zeroing */
320 ua_event = zmalloc(sizeof(struct ust_app_event));
321 if (ua_event == NULL) {
322 PERROR("malloc");
323 goto error;
324 }
325
326 ua_event->enabled = 1;
327 strncpy(ua_event->name, name, sizeof(ua_event->name));
328 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
329 ua_event->ctx = hashtable_new(0);
330 hashtable_node_init(&ua_event->node, (void *) ua_event->name,
331 strlen(ua_event->name));
332
333 /* Copy attributes */
334 if (attr) {
335 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
336 }
337
338 DBG3("UST app event %s allocated", ua_event->name);
339
340 return ua_event;
341
342error:
343 return NULL;
344}
345
346/*
347 * Alloc new UST app context.
348 */
349static
350struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
351{
352 struct ust_app_ctx *ua_ctx;
353
354 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
355 if (ua_ctx == NULL) {
356 goto error;
357 }
358
359 if (uctx) {
360 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
361 }
362
363 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
364
365error:
366 return ua_ctx;
367}
368
099e26bd 369/*
421cb601
DG
370 * Find an ust_app using the sock and return it. RCU read side lock must be
371 * held before calling this helper function.
099e26bd 372 */
8b366481
DG
373static
374struct ust_app *find_app_by_sock(int sock)
099e26bd 375{
f6a9efaa
DG
376 struct cds_lfht_node *node;
377 struct ust_app_key *key;
378 struct cds_lfht_iter iter;
f6a9efaa 379
f6a9efaa
DG
380 node = hashtable_lookup(ust_app_sock_key_map,
381 (void *)((unsigned long) sock), sizeof(void *), &iter);
382 if (node == NULL) {
383 DBG2("UST app find by sock %d key not found", sock);
f6a9efaa
DG
384 goto error;
385 }
386
387 key = caa_container_of(node, struct ust_app_key, node);
388
389 node = hashtable_lookup(ust_app_ht,
390 (void *)((unsigned long) key->pid), sizeof(void *), &iter);
391 if (node == NULL) {
392 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
393 goto error;
394 }
f6a9efaa
DG
395 return caa_container_of(node, struct ust_app, node);
396
397error:
398 return NULL;
099e26bd
DG
399}
400
55cc08a6
DG
401/*
402 * Create the channel context on the tracer.
403 */
404static
405int create_ust_channel_context(struct ust_app_channel *ua_chan,
406 struct ust_app_ctx *ua_ctx, struct ust_app *app)
407{
408 int ret;
409
410 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
411 ua_chan->obj, &ua_ctx->obj);
412 if (ret < 0) {
413 goto error;
414 }
415
416 ua_ctx->handle = ua_ctx->obj->handle;
417
418 DBG2("UST app context added to channel %s successfully", ua_chan->name);
419
420error:
421 return ret;
422}
423
424/*
425 * Create the event context on the tracer.
426 */
427static
428int create_ust_event_context(struct ust_app_event *ua_event,
429 struct ust_app_ctx *ua_ctx, struct ust_app *app)
430{
431 int ret;
432
433 ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
434 ua_event->obj, &ua_ctx->obj);
435 if (ret < 0) {
436 goto error;
437 }
438
439 ua_ctx->handle = ua_ctx->obj->handle;
440
441 DBG2("UST app context added to event %s successfully", ua_event->name);
442
443error:
444 return ret;
445}
446
9730260e
DG
447/*
448 * Disable the specified event on to UST tracer for the UST session.
449 */
450static int disable_ust_event(struct ust_app *app,
451 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
452{
453 int ret;
454
455 ret = ustctl_disable(app->key.sock, ua_event->obj);
456 if (ret < 0) {
457 ERR("UST app event %s disable failed for app (pid: %d) "
458 "and session handle %d with ret %d",
459 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
460 goto error;
461 }
462
463 DBG2("UST app event %s disabled successfully for app (pid: %d)",
464 ua_event->attr.name, app->key.pid);
465
466error:
467 return ret;
468}
469
78f0bacd
DG
470/*
471 * Disable the specified channel on to UST tracer for the UST session.
472 */
473static int disable_ust_channel(struct ust_app *app,
474 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
475{
476 int ret;
477
478 ret = ustctl_disable(app->key.sock, ua_chan->obj);
479 if (ret < 0) {
480 ERR("UST app channel %s disable failed for app (pid: %d) "
481 "and session handle %d with ret %d",
482 ua_chan->name, app->key.pid, ua_sess->handle, ret);
483 goto error;
484 }
485
78f0bacd
DG
486 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
487 ua_chan->name, app->key.pid);
488
489error:
490 return ret;
491}
492
493/*
494 * Enable the specified channel on to UST tracer for the UST session.
495 */
496static int enable_ust_channel(struct ust_app *app,
497 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
498{
499 int ret;
500
501 ret = ustctl_enable(app->key.sock, ua_chan->obj);
502 if (ret < 0) {
503 ERR("UST app channel %s enable failed for app (pid: %d) "
504 "and session handle %d with ret %d",
505 ua_chan->name, app->key.pid, ua_sess->handle, ret);
506 goto error;
507 }
508
509 ua_chan->enabled = 1;
510
511 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
512 ua_chan->name, app->key.pid);
513
514error:
515 return ret;
516}
517
edb67388
DG
518/*
519 * Enable the specified event on to UST tracer for the UST session.
520 */
521static int enable_ust_event(struct ust_app *app,
522 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
523{
524 int ret;
525
526 ret = ustctl_enable(app->key.sock, ua_event->obj);
527 if (ret < 0) {
528 ERR("UST app event %s enable failed for app (pid: %d) "
529 "and session handle %d with ret %d",
530 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
531 goto error;
532 }
533
534 DBG2("UST app event %s enabled successfully for app (pid: %d)",
535 ua_event->attr.name, app->key.pid);
536
537error:
538 return ret;
539}
540
099e26bd 541/*
5b4a0ec0 542 * Open metadata onto the UST tracer for a UST session.
0177d773 543 */
5b4a0ec0
DG
544static int open_ust_metadata(struct ust_app *app,
545 struct ust_app_session *ua_sess)
0177d773 546{
5b4a0ec0
DG
547 int ret;
548 struct lttng_ust_channel_attr uattr;
0177d773 549
5b4a0ec0
DG
550 uattr.overwrite = ua_sess->metadata->attr.overwrite;
551 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
552 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
553 uattr.switch_timer_interval =
554 ua_sess->metadata->attr.switch_timer_interval;
555 uattr.read_timer_interval =
556 ua_sess->metadata->attr.read_timer_interval;
557 uattr.output = ua_sess->metadata->attr.output;
558
559 /* UST tracer metadata creation */
560 ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
561 &ua_sess->metadata->obj);
562 if (ret < 0) {
563 ERR("UST app open metadata failed for app pid:%d",
564 app->key.pid);
f6a9efaa 565 goto error;
0177d773 566 }
f6a9efaa
DG
567
568error:
5b4a0ec0 569 return ret;
91d76f53
DG
570}
571
572/*
5b4a0ec0 573 * Create stream onto the UST tracer for a UST session.
91d76f53 574 */
5b4a0ec0
DG
575static int create_ust_stream(struct ust_app *app,
576 struct ust_app_session *ua_sess)
91d76f53 577{
5b4a0ec0 578 int ret;
421cb601 579
5b4a0ec0
DG
580 ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
581 &ua_sess->metadata->stream_obj);
582 if (ret < 0) {
583 ERR("UST create metadata stream failed");
421cb601 584 goto error;
91d76f53 585 }
421cb601 586
421cb601 587error:
5b4a0ec0 588 return ret;
91d76f53
DG
589}
590
b551a063 591/*
5b4a0ec0 592 * Create the specified channel onto the UST tracer for a UST session.
b551a063 593 */
5b4a0ec0
DG
594static int create_ust_channel(struct ust_app *app,
595 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 596{
5b4a0ec0 597 int ret;
b551a063 598
5b4a0ec0
DG
599 /* TODO: remove cast and use lttng-ust-abi.h */
600 ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
601 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
602 if (ret < 0) {
603 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
604 "and session handle %d with ret %d",
605 ua_chan->name, app->key.pid, app->key.sock,
606 ua_sess->handle, ret);
b551a063
DG
607 goto error;
608 }
609
5b4a0ec0
DG
610 ua_chan->handle = ua_chan->obj->handle;
611 ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
612 ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
613 ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
b551a063 614
5b4a0ec0
DG
615 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
616 ua_chan->name, app->key.pid, app->key.sock);
b551a063 617
8535a6d9
DG
618 /* If channel is not enabled, disable it on the tracer */
619 if (!ua_chan->enabled) {
620 ret = disable_ust_channel(app, ua_sess, ua_chan);
621 if (ret < 0) {
622 goto error;
623 }
624 }
625
b551a063
DG
626error:
627 return ret;
628}
629
91d76f53 630/*
5b4a0ec0 631 * Create the specified event onto the UST tracer for a UST session.
91d76f53 632 */
edb67388
DG
633static
634int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
635 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 636{
5b4a0ec0 637 int ret = 0;
284d8f55 638
5b4a0ec0
DG
639 /* Create UST event on tracer */
640 ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
641 &ua_event->obj);
642 if (ret < 0) {
643 ERR("Error ustctl create event %s for app pid: %d with ret %d",
644 ua_event->attr.name, app->key.pid, ret);
645 goto error;
91d76f53 646 }
f6a9efaa 647
5b4a0ec0 648 ua_event->handle = ua_event->obj->handle;
284d8f55 649
5b4a0ec0
DG
650 DBG2("UST app event %s created successfully for pid:%d",
651 ua_event->attr.name, app->key.pid);
f6a9efaa 652
8535a6d9
DG
653 /* If event not enabled, disable it on the tracer */
654 if (!ua_event->enabled) {
655 ret = disable_ust_event(app, ua_sess, ua_event);
656 if (ret < 0) {
657 goto error;
658 }
659 }
660
5b4a0ec0
DG
661error:
662 return ret;
91d76f53 663}
48842b30 664
5b4a0ec0
DG
665/*
666 * Copy data between an UST app event and a LTT event.
667 */
421cb601 668static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
669 struct ltt_ust_event *uevent)
670{
55cc08a6
DG
671 struct cds_lfht_iter iter;
672 struct ltt_ust_context *uctx;
673 struct ust_app_ctx *ua_ctx;
674
48842b30
DG
675 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
676 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
677
5b4a0ec0
DG
678 /* Copy event attributes */
679 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
680
55cc08a6
DG
681 cds_lfht_for_each_entry(uevent->ctx, &iter, uctx, node) {
682 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
683 if (ua_ctx == NULL) {
684 continue;
685 }
686 hashtable_node_init(&ua_ctx->node,
687 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
688 hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
689 }
48842b30
DG
690}
691
5b4a0ec0
DG
692/*
693 * Copy data between an UST app channel and a LTT channel.
694 */
421cb601 695static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
696 struct ltt_ust_channel *uchan)
697{
698 struct cds_lfht_iter iter;
5b4a0ec0 699 struct cds_lfht_node *ua_event_node;
48842b30 700 struct ltt_ust_event *uevent;
55cc08a6 701 struct ltt_ust_context *uctx;
48842b30 702 struct ust_app_event *ua_event;
55cc08a6 703 struct ust_app_ctx *ua_ctx;
48842b30 704
421cb601 705 DBG2("Shadow copy of UST app channel %s", ua_chan->name);
48842b30
DG
706
707 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
708 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
709 /* Copy event attributes */
710 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 711
55cc08a6
DG
712 cds_lfht_for_each_entry(uchan->ctx, &iter, uctx, node) {
713 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
714 if (ua_ctx == NULL) {
715 continue;
716 }
717 hashtable_node_init(&ua_ctx->node,
718 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
719 hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
720 }
48842b30 721
421cb601 722 /* Copy all events from ltt ust channel to ust app channel */
5b4a0ec0 723 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
ba767faf
MD
724 struct cds_lfht_iter uiter;
725
48842b30 726 ua_event_node = hashtable_lookup(ua_chan->events,
ba767faf
MD
727 (void *) uevent->attr.name, strlen(uevent->attr.name),
728 &uiter);
48842b30 729 if (ua_event_node == NULL) {
421cb601 730 DBG2("UST event %s not found on shadow copy channel",
48842b30 731 uevent->attr.name);
284d8f55 732 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 733 if (ua_event == NULL) {
5b4a0ec0 734 continue;
48842b30 735 }
421cb601 736 shadow_copy_event(ua_event, uevent);
48842b30 737 hashtable_add_unique(ua_chan->events, &ua_event->node);
48842b30 738 }
48842b30
DG
739 }
740
421cb601 741 DBG3("Shadow copy channel done");
48842b30
DG
742}
743
5b4a0ec0
DG
744/*
745 * Copy data between a UST app session and a regular LTT session.
746 */
421cb601 747static void shadow_copy_session(struct ust_app_session *ua_sess,
477d7741
MD
748 struct ltt_ust_session *usess,
749 struct ust_app *app)
48842b30 750{
5b4a0ec0 751 struct cds_lfht_node *ua_chan_node;
48842b30
DG
752 struct cds_lfht_iter iter;
753 struct ltt_ust_channel *uchan;
754 struct ust_app_channel *ua_chan;
477d7741
MD
755 time_t rawtime;
756 struct tm *timeinfo;
757 char datetime[16];
758 int ret;
759
760 /* Get date and time for unique app path */
761 time(&rawtime);
762 timeinfo = localtime(&rawtime);
763 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 764
421cb601 765 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30
DG
766
767 ua_sess->uid = usess->uid;
768
477d7741
MD
769 ret = snprintf(ua_sess->path, PATH_MAX,
770 "%s/%s-%d-%s",
771 usess->pathname, app->name, app->key.pid,
772 datetime);
773 if (ret < 0) {
774 PERROR("asprintf UST shadow copy session");
775 /* TODO: We cannot return an error from here.. */
776 assert(0);
777 }
778
48842b30
DG
779 /* TODO: support all UST domain */
780
781 /* Iterate over all channels in global domain. */
5b4a0ec0
DG
782 cds_lfht_for_each_entry(usess->domain_global.channels, &iter,
783 uchan, node) {
ba767faf
MD
784 struct cds_lfht_iter uiter;
785
48842b30 786 ua_chan_node = hashtable_lookup(ua_sess->channels,
ba767faf
MD
787 (void *)uchan->name, strlen(uchan->name),
788 &uiter);
5b4a0ec0
DG
789 if (ua_chan_node != NULL) {
790 continue;
791 }
421cb601 792
5b4a0ec0
DG
793 DBG2("Channel %s not found on shadow session copy, creating it",
794 uchan->name);
795 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
796 if (ua_chan == NULL) {
797 /* malloc failed... continuing */
798 continue;
48842b30
DG
799 }
800
5b4a0ec0
DG
801 shadow_copy_channel(ua_chan, uchan);
802 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
48842b30
DG
803 }
804}
805
78f0bacd
DG
806/*
807 * Lookup sesison wrapper.
808 */
84cd17c6
MD
809static
810void __lookup_session_by_app(struct ltt_ust_session *usess,
811 struct ust_app *app, struct cds_lfht_iter *iter)
812{
813 /* Get right UST app session from app */
814 (void) hashtable_lookup(app->sessions,
815 (void *) ((unsigned long) usess->uid), sizeof(void *),
816 iter);
817}
818
421cb601
DG
819/*
820 * Return ust app session from the app session hashtable using the UST session
821 * uid.
822 */
48842b30
DG
823static struct ust_app_session *lookup_session_by_app(
824 struct ltt_ust_session *usess, struct ust_app *app)
825{
826 struct cds_lfht_iter iter;
827 struct cds_lfht_node *node;
828
84cd17c6
MD
829 __lookup_session_by_app(usess, app, &iter);
830 node = hashtable_iter_get_node(&iter);
48842b30
DG
831 if (node == NULL) {
832 goto error;
833 }
834
835 return caa_container_of(node, struct ust_app_session, node);
836
837error:
838 return NULL;
839}
840
421cb601
DG
841/*
842 * Create a UST session onto the tracer of app and add it the session
843 * hashtable.
844 *
845 * Return ust app session or NULL on error.
846 */
847static struct ust_app_session *create_ust_app_session(
848 struct ltt_ust_session *usess, struct ust_app *app)
849{
850 int ret;
851 struct ust_app_session *ua_sess;
852
853 ua_sess = lookup_session_by_app(usess, app);
854 if (ua_sess == NULL) {
855 DBG2("UST app pid: %d session uid %d not found, creating it",
856 app->key.pid, usess->uid);
857 ua_sess = alloc_ust_app_session();
858 if (ua_sess == NULL) {
859 /* Only malloc can failed so something is really wrong */
860 goto error;
861 }
477d7741 862 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
863 }
864
865 if (ua_sess->handle == -1) {
866 ret = ustctl_create_session(app->key.sock);
867 if (ret < 0) {
868 ERR("Error creating session for app pid %d, sock %d",
869 app->key.pid, app->key.sock);
870 /* TODO: free() ua_sess */
871 goto error;
872 }
873
874 DBG2("UST app ustctl create session handle %d", ret);
875 ua_sess->handle = ret;
876
877 /* Add ust app session to app's HT */
878 hashtable_node_init(&ua_sess->node,
879 (void *)((unsigned long) ua_sess->uid), sizeof(void *));
880 hashtable_add_unique(app->sessions, &ua_sess->node);
881
882 DBG2("UST app session created successfully with handle %d", ret);
883 }
884
885 return ua_sess;
886
887error:
888 return NULL;
889}
890
55cc08a6
DG
891/*
892 * Create a context for the channel on the tracer.
893 */
894static
895int create_ust_app_channel_context(struct ust_app_session *ua_sess,
896 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
897 struct ust_app *app)
898{
899 int ret = 0;
900 struct cds_lfht_iter iter;
901 struct cds_lfht_node *node;
902 struct ust_app_ctx *ua_ctx;
903
904 DBG2("UST app adding context to channel %s", ua_chan->name);
905
906 node = hashtable_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx),
907 sizeof(void *), &iter);
908 if (node != NULL) {
909 ret = -EEXIST;
910 goto error;
911 }
912
913 ua_ctx = alloc_ust_app_ctx(uctx);
914 if (ua_ctx == NULL) {
915 /* malloc failed */
916 ret = -1;
917 goto error;
918 }
919
920 hashtable_node_init(&ua_ctx->node,
921 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
922 hashtable_add_unique(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
929error:
930 return ret;
931}
932
933/*
934 * Create an UST context and enable it for the event on the tracer.
935 */
936static
937int 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 cds_lfht_iter iter;
943 struct cds_lfht_node *node;
944 struct ust_app_ctx *ua_ctx;
945
946 DBG2("UST app adding context to event %s", ua_event->name);
947
948 node = hashtable_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx),
949 sizeof(void *), &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 hashtable_node_init(&ua_ctx->node,
963 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
964 hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
965
966 ret = create_ust_event_context(ua_event, ua_ctx, app);
967 if (ret < 0) {
968 goto error;
969 }
970
971error:
972 return ret;
973}
974
edb67388
DG
975/*
976 * Enable on the tracer side a ust app event for the session and channel.
977 */
978static
979int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 980 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
981{
982 int ret;
983
984 ret = enable_ust_event(app, ua_sess, ua_event);
985 if (ret < 0) {
986 goto error;
987 }
988
989 ua_event->enabled = 1;
990
991error:
992 return ret;
993}
994
9730260e
DG
995/*
996 * Disable on the tracer side a ust app event for the session and channel.
997 */
998static int disable_ust_app_event(struct ust_app_session *ua_sess,
999 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event,
1000 struct ust_app *app)
1001{
1002 int ret;
1003
1004 ret = disable_ust_event(app, ua_sess, ua_event);
1005 if (ret < 0) {
1006 goto error;
1007 }
1008
1009 ua_event->enabled = 0;
1010
1011error:
1012 return ret;
1013}
1014
78f0bacd
DG
1015/*
1016 * Lookup ust app channel for session and disable it on the tracer side.
1017 */
8535a6d9
DG
1018static
1019int disable_ust_app_channel(struct ust_app_session *ua_sess,
1020 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1021{
8535a6d9 1022 int ret;
78f0bacd
DG
1023
1024 ret = disable_ust_channel(app, ua_sess, ua_chan);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
8535a6d9
DG
1029 ua_chan->enabled = 0;
1030
78f0bacd
DG
1031error:
1032 return ret;
1033}
1034
1035/*
1036 * Lookup ust app channel for session and enable it on the tracer side.
1037 */
1038static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1039 struct ltt_ust_channel *uchan, struct ust_app *app)
1040{
1041 int ret = 0;
1042 struct cds_lfht_iter iter;
1043 struct cds_lfht_node *ua_chan_node;
1044 struct ust_app_channel *ua_chan;
1045
1046 ua_chan_node = hashtable_lookup(ua_sess->channels,
1047 (void *)uchan->name, strlen(uchan->name), &iter);
1048 if (ua_chan_node == NULL) {
1049 DBG2("Unable to find channel %s in ust session uid %u",
1050 uchan->name, ua_sess->uid);
1051 goto error;
1052 }
1053
1054 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1055
1056 ret = enable_ust_channel(app, ua_sess, ua_chan);
1057 if (ret < 0) {
1058 goto error;
1059 }
1060
1061error:
1062 return ret;
1063}
1064
284d8f55 1065/*
5b4a0ec0 1066 * Create UST app channel and create it on the tracer.
284d8f55 1067 */
5b4a0ec0
DG
1068static struct ust_app_channel *create_ust_app_channel(
1069 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1070 struct ust_app *app)
1071{
1072 int ret = 0;
1073 struct cds_lfht_iter iter;
1074 struct cds_lfht_node *ua_chan_node;
1075 struct ust_app_channel *ua_chan;
1076
1077 /* Lookup channel in the ust app session */
1078 ua_chan_node = hashtable_lookup(ua_sess->channels,
1079 (void *)uchan->name, strlen(uchan->name), &iter);
1080 if (ua_chan_node == NULL) {
1081 DBG2("Unable to find channel %s in ust session uid %u",
1082 uchan->name, ua_sess->uid);
1083 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1084 if (ua_chan == NULL) {
1085 goto error;
1086 }
1087 shadow_copy_channel(ua_chan, uchan);
1088
1089 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
1090 } else {
1091 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1092 }
1093
1094 ret = create_ust_channel(app, ua_sess, ua_chan);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 return ua_chan;
1100
1101error:
1102 return NULL;
1103}
1104
1105/*
1106 * Create UST app event and create it on the tracer side.
1107 */
edb67388
DG
1108static
1109int create_ust_app_event(struct ust_app_session *ua_sess,
1110 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1111 struct ust_app *app)
284d8f55 1112{
edb67388 1113 int ret = 0;
5b4a0ec0
DG
1114 struct cds_lfht_iter iter;
1115 struct cds_lfht_node *ua_event_node;
1116 struct ust_app_event *ua_event;
284d8f55 1117
5b4a0ec0
DG
1118 /* Get event node */
1119 ua_event_node = hashtable_lookup(ua_chan->events,
1120 (void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
edb67388
DG
1121 if (ua_event_node != NULL) {
1122 ERR("UST app event %s already exist. Stopping creation.",
1123 uevent->attr.name);
1124 goto end;
1125 }
5b4a0ec0 1126
edb67388
DG
1127 /* Does not exist so create one */
1128 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1129 if (ua_event == NULL) {
1130 /* Only malloc can failed so something is really wrong */
1131 ret = -ENOMEM;
1132 goto error;
5b4a0ec0 1133 }
edb67388 1134 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1135
edb67388 1136 /* Create it on the tracer side */
5b4a0ec0 1137 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1138 if (ret < 0) {
e5abf1bf 1139 rcu_read_lock();
edb67388 1140 delete_ust_app_event(app->key.sock, ua_event);
e5abf1bf 1141 rcu_read_unlock();
284d8f55
DG
1142 goto error;
1143 }
1144
8535a6d9
DG
1145 ua_event->enabled = 1;
1146
edb67388 1147 hashtable_add_unique(ua_chan->events, &ua_event->node);
284d8f55 1148
edb67388 1149end:
5b4a0ec0 1150error:
edb67388 1151 return ret;
5b4a0ec0
DG
1152}
1153
1154/*
1155 * Create UST metadata and open it on the tracer side.
1156 */
1157static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1158 char *pathname, struct ust_app *app)
1159{
1160 int ret = 0;
1161
1162 if (ua_sess->metadata == NULL) {
1163 /* Allocate UST metadata */
1164 ua_sess->metadata = trace_ust_create_metadata(pathname);
1165 if (ua_sess->metadata == NULL) {
1166 ERR("UST app session %d creating metadata failed",
1167 ua_sess->handle);
1168 goto error;
1169 }
1170
1171 ret = open_ust_metadata(app, ua_sess);
1172 if (ret < 0) {
1173 goto error;
1174 }
1175
1176 DBG2("UST metadata opened for app pid %d", app->key.pid);
1177 }
1178
1179 /* Open UST metadata stream */
1180 if (ua_sess->metadata->stream_obj == NULL) {
1181 ret = create_ust_stream(app, ua_sess);
1182 if (ret < 0) {
1183 goto error;
1184 }
1185
477d7741 1186 ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG);
5b4a0ec0
DG
1187 if (ret < 0) {
1188 PERROR("mkdir UST metadata");
1189 goto error;
1190 }
1191
477d7741
MD
1192 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1193 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1194 if (ret < 0) {
1195 PERROR("asprintf UST create stream");
1196 goto error;
1197 }
1198
1199 DBG2("UST metadata stream object created for app pid %d",
1200 app->key.pid);
1201 } else {
1202 ERR("Attempting to create stream without metadata opened");
1203 goto error;
1204 }
1205
1206 return 0;
1207
1208error:
1209 return -1;
1210}
1211
1212/*
1213 * Return pointer to traceable apps list.
1214 */
1215struct cds_lfht *ust_app_get_ht(void)
1216{
1217 return ust_app_ht;
1218}
1219
1220/*
1221 * Return ust app pointer or NULL if not found.
1222 */
1223struct ust_app *ust_app_find_by_pid(pid_t pid)
1224{
1225 struct cds_lfht_node *node;
1226 struct cds_lfht_iter iter;
1227
1228 rcu_read_lock();
1229 node = hashtable_lookup(ust_app_ht,
1230 (void *)((unsigned long) pid), sizeof(void *), &iter);
1231 if (node == NULL) {
1232 DBG2("UST app no found with pid %d", pid);
1233 goto error;
1234 }
1235 rcu_read_unlock();
1236
1237 DBG2("Found UST app by pid %d", pid);
1238
1239 return caa_container_of(node, struct ust_app, node);
1240
1241error:
1242 rcu_read_unlock();
1243 return NULL;
1244}
1245
1246/*
1247 * Using pid and uid (of the app), allocate a new ust_app struct and
1248 * add it to the global traceable app list.
1249 *
0df502fd
MD
1250 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1251 * bitness is not supported.
5b4a0ec0
DG
1252 */
1253int ust_app_register(struct ust_register_msg *msg, int sock)
1254{
1255 struct ust_app *lta;
1256
7753dea8
MD
1257 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1258 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
f943b0fb 1259 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1260 "%d-bit long, but no consumerd for this long size is available.\n",
1261 msg->name, msg->pid, msg->bits_per_long);
88ff5b7f 1262 close(sock);
0df502fd
MD
1263 return -EINVAL;
1264 }
5b4a0ec0
DG
1265 lta = zmalloc(sizeof(struct ust_app));
1266 if (lta == NULL) {
1267 PERROR("malloc");
1268 return -ENOMEM;
1269 }
1270
1271 lta->ppid = msg->ppid;
1272 lta->uid = msg->uid;
1273 lta->gid = msg->gid;
7753dea8 1274 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1275 lta->v_major = msg->major;
1276 lta->v_minor = msg->minor;
1277 strncpy(lta->name, msg->name, sizeof(lta->name));
1278 lta->name[16] = '\0';
1279 lta->sessions = hashtable_new(0);
1280
1281 /* Set key map */
1282 lta->key.pid = msg->pid;
1283 hashtable_node_init(&lta->node, (void *)((unsigned long)lta->key.pid),
1284 sizeof(void *));
1285 lta->key.sock = sock;
1286 hashtable_node_init(&lta->key.node, (void *)((unsigned long)lta->key.sock),
1287 sizeof(void *));
1288
1289 rcu_read_lock();
1290 hashtable_add_unique(ust_app_sock_key_map, &lta->key.node);
1291 hashtable_add_unique(ust_app_ht, &lta->node);
1292 rcu_read_unlock();
1293
1294 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1295 " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1296 lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1297
1298 return 0;
1299}
1300
1301/*
1302 * Unregister app by removing it from the global traceable app list and freeing
1303 * the data struct.
1304 *
1305 * The socket is already closed at this point so no close to sock.
1306 */
1307void ust_app_unregister(int sock)
1308{
1309 struct ust_app *lta;
1310 struct cds_lfht_node *node;
1311 struct cds_lfht_iter iter;
525b0740 1312 int ret;
5b4a0ec0
DG
1313
1314 rcu_read_lock();
1315 lta = find_app_by_sock(sock);
1316 if (lta == NULL) {
1317 ERR("Unregister app sock %d not found!", sock);
1318 goto error;
1319 }
1320
1321 DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1322
1323 /* Get the node reference for a call_rcu */
1324 node = hashtable_lookup(ust_app_ht,
1325 (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter);
1326 if (node == NULL) {
1327 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1328 goto error;
1329 }
284d8f55 1330
525b0740
MD
1331 ret = hashtable_del(ust_app_ht, &iter);
1332 assert(!ret);
5b4a0ec0 1333 call_rcu(&node->head, delete_ust_app_rcu);
284d8f55 1334error:
5b4a0ec0
DG
1335 rcu_read_unlock();
1336 return;
284d8f55
DG
1337}
1338
1339/*
5b4a0ec0 1340 * Return traceable_app_count
284d8f55 1341 */
5b4a0ec0 1342unsigned long ust_app_list_count(void)
284d8f55 1343{
5b4a0ec0 1344 unsigned long count;
284d8f55 1345
5b4a0ec0
DG
1346 rcu_read_lock();
1347 count = hashtable_get_count(ust_app_ht);
1348 rcu_read_unlock();
284d8f55 1349
5b4a0ec0 1350 return count;
284d8f55
DG
1351}
1352
5b4a0ec0
DG
1353/*
1354 * Fill events array with all events name of all registered apps.
1355 */
1356int ust_app_list_events(struct lttng_event **events)
421cb601 1357{
5b4a0ec0
DG
1358 int ret, handle;
1359 size_t nbmem, count = 0;
421cb601 1360 struct cds_lfht_iter iter;
5b4a0ec0
DG
1361 struct ust_app *app;
1362 struct lttng_event *tmp;
421cb601 1363
5b4a0ec0
DG
1364 nbmem = UST_APP_EVENT_LIST_SIZE;
1365 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1366 if (tmp == NULL) {
1367 PERROR("zmalloc ust app events");
1368 ret = -ENOMEM;
421cb601
DG
1369 goto error;
1370 }
1371
5b4a0ec0 1372 rcu_read_lock();
421cb601 1373
5b4a0ec0
DG
1374 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1375 handle = ustctl_tracepoint_list(app->key.sock);
1376 if (handle < 0) {
1377 ERR("UST app list events getting handle failed for app pid %d",
1378 app->key.pid);
1379 continue;
1380 }
421cb601 1381
5b4a0ec0
DG
1382 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1383 tmp[count].name)) != -ENOENT) {
1384 if (count > nbmem) {
1385 DBG2("Reallocating event list from %zu to %zu bytes", nbmem,
1386 nbmem + UST_APP_EVENT_LIST_SIZE);
1387 nbmem += UST_APP_EVENT_LIST_SIZE;
2f221590 1388 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1389 if (tmp == NULL) {
1390 PERROR("realloc ust app events");
1391 ret = -ENOMEM;
1392 goto rcu_error;
1393 }
1394 }
421cb601 1395
5b4a0ec0
DG
1396 tmp[count].type = LTTNG_UST_TRACEPOINT;
1397 tmp[count].pid = app->key.pid;
1398 tmp[count].enabled = -1;
1399 count++;
421cb601 1400 }
421cb601
DG
1401 }
1402
5b4a0ec0
DG
1403 ret = count;
1404 *events = tmp;
421cb601 1405
5b4a0ec0 1406 DBG2("UST app list events done (%zu events)", count);
421cb601 1407
5b4a0ec0
DG
1408rcu_error:
1409 rcu_read_unlock();
421cb601 1410error:
5b4a0ec0 1411 return ret;
421cb601
DG
1412}
1413
5b4a0ec0
DG
1414/*
1415 * Free and clean all traceable apps of the global list.
1416 */
1417void ust_app_clean_list(void)
421cb601 1418{
5b4a0ec0 1419 int ret;
5b4a0ec0
DG
1420 struct cds_lfht_iter iter;
1421 struct ust_app *app;
421cb601 1422
5b4a0ec0 1423 DBG2("UST app cleaning registered apps hash table");
421cb601 1424
5b4a0ec0 1425 rcu_read_lock();
421cb601 1426
778ca3dd 1427 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
5b4a0ec0 1428 ret = hashtable_del(ust_app_ht, &iter);
525b0740 1429 assert(!ret);
0d5d001d 1430 call_rcu(&iter.node->head, delete_ust_app_rcu);
421cb601
DG
1431 }
1432
5b4a0ec0
DG
1433 hashtable_destroy(ust_app_ht);
1434 hashtable_destroy(ust_app_sock_key_map);
421cb601 1435
5b4a0ec0
DG
1436 rcu_read_unlock();
1437}
1438
1439/*
1440 * Init UST app hash table.
1441 */
1442void ust_app_ht_alloc(void)
1443{
1444 ust_app_ht = hashtable_new(0);
1445 ust_app_sock_key_map = hashtable_new(0);
421cb601
DG
1446}
1447
78f0bacd
DG
1448/*
1449 * For a specific UST session, disable the channel for all registered apps.
1450 */
35a9059d 1451int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1452 struct ltt_ust_channel *uchan)
1453{
1454 int ret = 0;
1455 struct cds_lfht_iter iter;
8535a6d9 1456 struct cds_lfht_node *ua_chan_node;
78f0bacd
DG
1457 struct ust_app *app;
1458 struct ust_app_session *ua_sess;
8535a6d9 1459 struct ust_app_channel *ua_chan;
78f0bacd
DG
1460
1461 if (usess == NULL || uchan == NULL) {
1462 ERR("Disabling UST global channel with NULL values");
1463 ret = -1;
1464 goto error;
1465 }
1466
8535a6d9 1467 DBG2("UST app disabling channel %s from global domain for session uid %d",
78f0bacd
DG
1468 uchan->name, usess->uid);
1469
1470 rcu_read_lock();
1471
1472 /* For every registered applications */
1473 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1474 ua_sess = lookup_session_by_app(usess, app);
1475 if (ua_sess == NULL) {
1476 continue;
1477 }
1478
8535a6d9
DG
1479 /* Get channel */
1480 ua_chan_node = hashtable_lookup(ua_sess->channels,
1481 (void *)uchan->name, strlen(uchan->name), &iter);
1482 /* If the session if found for the app, the channel must be there */
1483 assert(ua_chan_node);
1484
1485 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1486 /* The channel must not be already disabled */
1487 assert(ua_chan->enabled == 1);
1488
1489 /* Disable channel onto application */
1490 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1491 if (ret < 0) {
1492 /* XXX: We might want to report this error at some point... */
1493 continue;
1494 }
1495 }
1496
1497 rcu_read_unlock();
1498
1499error:
1500 return ret;
1501}
1502
1503/*
1504 * For a specific UST session, enable the channel for all registered apps.
1505 */
35a9059d 1506int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1507 struct ltt_ust_channel *uchan)
1508{
1509 int ret = 0;
1510 struct cds_lfht_iter iter;
1511 struct ust_app *app;
1512 struct ust_app_session *ua_sess;
1513
1514 if (usess == NULL || uchan == NULL) {
1515 ERR("Adding UST global channel to NULL values");
1516 ret = -1;
1517 goto error;
1518 }
1519
1520 DBG2("UST app enabling channel %s to global domain for session uid %d",
1521 uchan->name, usess->uid);
1522
1523 rcu_read_lock();
1524
1525 /* For every registered applications */
1526 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1527 ua_sess = lookup_session_by_app(usess, app);
1528 if (ua_sess == NULL) {
1529 continue;
1530 }
1531
1532 /* Enable channel onto application */
1533 ret = enable_ust_app_channel(ua_sess, uchan, app);
1534 if (ret < 0) {
1535 /* XXX: We might want to report this error at some point... */
1536 continue;
1537 }
1538 }
1539
1540 rcu_read_unlock();
1541
1542error:
1543 return ret;
1544}
1545
b0a40d28
DG
1546/*
1547 * Disable an event in a channel and for a specific session.
1548 */
35a9059d
DG
1549int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1550 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1551{
1552 int ret = 0;
1553 struct cds_lfht_iter iter, uiter;
1554 struct cds_lfht_node *ua_chan_node, *ua_event_node;
1555 struct ust_app *app;
1556 struct ust_app_session *ua_sess;
1557 struct ust_app_channel *ua_chan;
1558 struct ust_app_event *ua_event;
1559
1560 DBG("UST app disabling event %s for all apps in channel "
35a9059d 1561 "%s for session uid %d", uevent->attr.name, uchan->name, usess->uid);
b0a40d28
DG
1562
1563 rcu_read_lock();
1564
1565 /* For all registered applications */
1566 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1567 ua_sess = lookup_session_by_app(usess, app);
1568 if (ua_sess == NULL) {
1569 /* Next app */
1570 continue;
1571 }
1572
1573 /* Lookup channel in the ust app session */
1574 ua_chan_node = hashtable_lookup(ua_sess->channels,
1575 (void *)uchan->name, strlen(uchan->name), &uiter);
1576 if (ua_chan_node == NULL) {
1577 DBG2("Channel %s not found in session uid %d for app pid %d."
1578 "Skipping", uchan->name, usess->uid, app->key.pid);
1579 continue;
1580 }
1581 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1582
1583 ua_event_node = hashtable_lookup(ua_chan->events,
35a9059d 1584 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
b0a40d28
DG
1585 if (ua_event_node == NULL) {
1586 DBG2("Event %s not found in channel %s for app pid %d."
35a9059d 1587 "Skipping", uevent->attr.name, uchan->name, app->key.pid);
b0a40d28
DG
1588 continue;
1589 }
1590 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1591
1592 ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app);
1593 if (ret < 0) {
1594 /* XXX: Report error someday... */
1595 continue;
1596 }
1597 }
1598
1599 rcu_read_unlock();
1600
1601 return ret;
1602}
1603
9730260e 1604/*
edb67388 1605 * For a specific UST session and UST channel, the event for all
9730260e
DG
1606 * registered apps.
1607 */
35a9059d 1608int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1609 struct ltt_ust_channel *uchan)
1610{
1611 int ret = 0;
1612 struct cds_lfht_iter iter, uiter;
1613 struct cds_lfht_node *ua_chan_node;
1614 struct ust_app *app;
1615 struct ust_app_session *ua_sess;
1616 struct ust_app_channel *ua_chan;
1617 struct ust_app_event *ua_event;
1618
1619 DBG("UST app disabling all event for all apps in channel "
1620 "%s for session uid %d", uchan->name, usess->uid);
1621
1622 rcu_read_lock();
1623
1624 /* For all registered applications */
1625 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1626 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1627 /* If ua_sess is NULL, there is a code flow error */
1628 assert(ua_sess);
9730260e
DG
1629
1630 /* Lookup channel in the ust app session */
edb67388
DG
1631 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1632 strlen(uchan->name), &uiter);
1633 /* If the channel is not found, there is a code flow error */
1634 assert(ua_chan_node);
1635
9730260e
DG
1636 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1637
1638 /* Disable each events of channel */
1639 cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
1640 ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app);
1641 if (ret < 0) {
1642 /* XXX: Report error someday... */
1643 continue;
1644 }
1645 }
1646 }
1647
1648 rcu_read_unlock();
1649
1650 return ret;
1651}
1652
421cb601 1653/*
5b4a0ec0 1654 * For a specific UST session, create the channel for all registered apps.
421cb601 1655 */
35a9059d 1656int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1657 struct ltt_ust_channel *uchan)
1658{
1659 int ret = 0;
1660 struct cds_lfht_iter iter;
48842b30
DG
1661 struct ust_app *app;
1662 struct ust_app_session *ua_sess;
1663 struct ust_app_channel *ua_chan;
1664
421cb601
DG
1665 if (usess == NULL || uchan == NULL) {
1666 ERR("Adding UST global channel to NULL values");
1667 ret = -1;
1668 goto error;
1669 }
1670
48842b30
DG
1671 DBG2("UST app adding channel %s to global domain for session uid %d",
1672 uchan->name, usess->uid);
1673
1674 rcu_read_lock();
421cb601 1675
5b4a0ec0
DG
1676 /* For every registered applications */
1677 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
edb67388
DG
1678 /*
1679 * Create session on the tracer side and add it to app session HT. Note
1680 * that if session exist, it will simply return a pointer to the ust
1681 * app session.
1682 */
421cb601 1683 ua_sess = create_ust_app_session(usess, app);
509cbaf8 1684 if (ua_sess == NULL) {
5b4a0ec0 1685 continue;
48842b30
DG
1686 }
1687
421cb601
DG
1688 /* Create channel onto application */
1689 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1690 if (ua_chan == NULL) {
5b4a0ec0 1691 continue;
48842b30 1692 }
48842b30 1693 }
5b4a0ec0 1694
48842b30
DG
1695 rcu_read_unlock();
1696
421cb601 1697error:
48842b30
DG
1698 return ret;
1699}
1700
5b4a0ec0 1701/*
edb67388 1702 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 1703 */
35a9059d 1704int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
1705 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1706{
1707 int ret = 0;
edb67388 1708 struct cds_lfht_iter iter, uiter;
35a9059d 1709 struct cds_lfht_node *ua_chan_node, *ua_event_node;
48842b30
DG
1710 struct ust_app *app;
1711 struct ust_app_session *ua_sess;
1712 struct ust_app_channel *ua_chan;
1713 struct ust_app_event *ua_event;
48842b30 1714
edb67388 1715 DBG("UST app enabling event %s for all apps for session uid %d",
48842b30
DG
1716 uevent->attr.name, usess->uid);
1717
edb67388
DG
1718 /*
1719 * NOTE: At this point, this function is called only if the session and
1720 * channel passed are already created for all apps. and enabled on the
1721 * tracer also.
1722 */
1723
48842b30 1724 rcu_read_lock();
421cb601
DG
1725
1726 /* For all registered applications */
5b4a0ec0 1727 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
edb67388
DG
1728 ua_sess = lookup_session_by_app(usess, app);
1729 /* If ua_sess is NULL, there is a code flow error */
1730 assert(ua_sess);
ba767faf 1731
edb67388
DG
1732 /* Lookup channel in the ust app session */
1733 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1734 strlen(uchan->name), &uiter);
1735 /* If the channel is not found, there is a code flow error */
1736 assert(ua_chan_node);
1737
1738 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1739
35a9059d
DG
1740 ua_event_node = hashtable_lookup(ua_sess->channels,
1741 (void*)uevent->attr.name, strlen(uevent->attr.name), &uiter);
1742 if (ua_event_node == NULL) {
1743 DBG3("UST app enable event %s not found. Skipping app",
1744 uevent->attr.name);
1745 continue;
1746 }
1747 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1748
1749 ret = enable_ust_app_event(ua_sess, ua_event, app);
1750 if (ret < 0) {
1751 /* XXX: Report error someday... */
1752 continue;
48842b30 1753 }
edb67388
DG
1754 }
1755
1756 rcu_read_unlock();
1757
1758 return ret;
1759}
1760
1761/*
1762 * For a specific existing UST session and UST channel, creates the event for
1763 * all registered apps.
1764 */
35a9059d 1765int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
1766 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1767{
1768 int ret = 0;
1769 struct cds_lfht_iter iter, uiter;
1770 struct cds_lfht_node *ua_chan_node;
1771 struct ust_app *app;
1772 struct ust_app_session *ua_sess;
1773 struct ust_app_channel *ua_chan;
1774
1775 DBG("UST app creating event %s for all apps for session uid %d",
1776 uevent->attr.name, usess->uid);
1777
1778 /*
1779 * NOTE: At this point, this function is called only if the session and
1780 * channel passed are already created for all apps. and enabled on the
1781 * tracer also.
1782 */
1783
1784 rcu_read_lock();
1785
1786 /* For all registered applications */
1787 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1788 ua_sess = lookup_session_by_app(usess, app);
1789 /* If ua_sess is NULL, there is a code flow error */
1790 assert(ua_sess);
48842b30
DG
1791
1792 /* Lookup channel in the ust app session */
edb67388
DG
1793 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1794 strlen(uchan->name), &uiter);
1795 /* If the channel is not found, there is a code flow error */
1796 assert(ua_chan_node);
1797
48842b30
DG
1798 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1799
edb67388
DG
1800 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1801 if (ret < 0) {
5b4a0ec0 1802 continue;
48842b30 1803 }
48842b30 1804 }
5b4a0ec0 1805
48842b30
DG
1806 rcu_read_unlock();
1807
1808 return ret;
1809}
1810
5b4a0ec0
DG
1811/*
1812 * Start tracing for a specific UST session and app.
1813 */
421cb601 1814int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
1815{
1816 int ret = 0;
1817 struct cds_lfht_iter iter;
48842b30
DG
1818 struct ust_app_session *ua_sess;
1819 struct ust_app_channel *ua_chan;
5b4a0ec0 1820 struct ltt_ust_stream *ustream;
7753dea8 1821 int consumerd_fd;
48842b30 1822
421cb601 1823 DBG("Starting tracing for ust app pid %d", app->key.pid);
5cf5d0e7 1824
509cbaf8
MD
1825 rcu_read_lock();
1826
421cb601
DG
1827 ua_sess = lookup_session_by_app(usess, app);
1828 if (ua_sess == NULL) {
509cbaf8 1829 goto error_rcu_unlock;
421cb601 1830 }
48842b30 1831
aea829b3
DG
1832 /* Upon restart, we skip the setup, already done */
1833 if (ua_sess->started) {
8be98f9a 1834 goto skip_setup;
aea829b3 1835 }
8be98f9a 1836
421cb601
DG
1837 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1838 if (ret < 0) {
509cbaf8 1839 goto error_rcu_unlock;
421cb601 1840 }
48842b30 1841
421cb601 1842 /* For each channel */
5b4a0ec0 1843 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
421cb601
DG
1844 /* Create all streams */
1845 while (1) {
5b4a0ec0 1846 /* Create UST stream */
421cb601
DG
1847 ustream = zmalloc(sizeof(*ustream));
1848 if (ustream == NULL) {
1849 PERROR("zmalloc ust stream");
509cbaf8 1850 goto error_rcu_unlock;
421cb601 1851 }
48842b30 1852
421cb601
DG
1853 ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1854 &ustream->obj);
48842b30 1855 if (ret < 0) {
421cb601
DG
1856 /* Got all streams */
1857 break;
48842b30 1858 }
421cb601 1859 ustream->handle = ustream->obj->handle;
48842b30 1860
421cb601
DG
1861 /* Order is important */
1862 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
477d7741
MD
1863 ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1864 ua_sess->path, ua_chan->name,
1865 ua_chan->streams.count++);
aba8e916
DG
1866 if (ret < 0) {
1867 PERROR("asprintf UST create stream");
421cb601 1868 continue;
aba8e916 1869 }
421cb601
DG
1870 DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1871 ustream->pathname);
1872 }
421cb601 1873 }
aba8e916 1874
7753dea8
MD
1875 switch (app->bits_per_long) {
1876 case 64:
1877 consumerd_fd = ust_consumerd64_fd;
1878 break;
1879 case 32:
1880 consumerd_fd = ust_consumerd32_fd;
1881 break;
1882 default:
1883 ret = -EINVAL;
1884 goto error_rcu_unlock;
1885 }
aea829b3 1886
421cb601 1887 /* Setup UST consumer socket and send fds to it */
7753dea8 1888 ret = ust_consumer_send_session(consumerd_fd, ua_sess);
421cb601 1889 if (ret < 0) {
509cbaf8 1890 goto error_rcu_unlock;
421cb601 1891 }
8be98f9a 1892 ua_sess->started = 1;
48842b30 1893
8be98f9a 1894skip_setup:
421cb601
DG
1895 /* This start the UST tracing */
1896 ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1897 if (ret < 0) {
1898 ERR("Error starting tracing for app pid: %d", app->key.pid);
509cbaf8 1899 goto error_rcu_unlock;
421cb601 1900 }
5b4a0ec0 1901
509cbaf8 1902 rcu_read_unlock();
48842b30 1903
421cb601
DG
1904 /* Quiescent wait after starting trace */
1905 ustctl_wait_quiescent(app->key.sock);
48842b30 1906
421cb601 1907 return 0;
48842b30 1908
509cbaf8
MD
1909error_rcu_unlock:
1910 rcu_read_unlock();
421cb601
DG
1911 return -1;
1912}
48842b30 1913
8be98f9a
MD
1914/*
1915 * Stop tracing for a specific UST session and app.
1916 */
1917int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1918{
1919 int ret = 0;
1920 struct ust_app_session *ua_sess;
1921
1922 DBG("Stopping tracing for ust app pid %d", app->key.pid);
1923
1924 rcu_read_lock();
1925
1926 ua_sess = lookup_session_by_app(usess, app);
1927 if (ua_sess == NULL) {
1928 /* Only malloc can failed so something is really wrong */
1929 goto error_rcu_unlock;
1930 }
1931
1932#if 0 /* only useful when periodical flush will be supported */
1933 /* need to keep a handle on shm in session for this. */
1934 /* Flush all buffers before stopping */
1935 ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj);
1936 if (ret < 0) {
1937 ERR("UST metadata flush failed");
1938 }
1939
1940 cds_list_for_each_entry(ustchan, &usess->channels.head, list) {
1941 ret = ustctl_flush_buffer(usess->sock, ustchan->obj);
1942 if (ret < 0) {
1943 ERR("UST flush buffer error");
1944 }
1945 }
1946#endif
1947
1948 /* This inhibits UST tracing */
1949 ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1950 if (ret < 0) {
1951 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1952 goto error_rcu_unlock;
1953 }
1954
1955 rcu_read_unlock();
1956
1957 /* Quiescent wait after stopping trace */
1958 ustctl_wait_quiescent(app->key.sock);
1959
1960 return 0;
1961
1962error_rcu_unlock:
1963 rcu_read_unlock();
1964 return -1;
1965}
1966
84cd17c6
MD
1967/*
1968 * Destroy a specific UST session in apps.
1969 */
1970int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
1971{
1972 struct ust_app_session *ua_sess;
1973 struct lttng_ust_object_data obj;
1974 struct cds_lfht_iter iter;
1975 struct cds_lfht_node *node;
525b0740 1976 int ret;
84cd17c6
MD
1977
1978 DBG("Destroy tracing for ust app pid %d", app->key.pid);
1979
1980 rcu_read_lock();
1981
1982 __lookup_session_by_app(usess, app, &iter);
1983 node = hashtable_iter_get_node(&iter);
1984 if (node == NULL) {
1985 /* Only malloc can failed so something is really wrong */
1986 goto error_rcu_unlock;
1987 }
1988 ua_sess = caa_container_of(node, struct ust_app_session, node);
525b0740
MD
1989 ret = hashtable_del(app->sessions, &iter);
1990 assert(!ret);
84cd17c6
MD
1991 delete_ust_app_session(app->key.sock, ua_sess);
1992 obj.handle = ua_sess->handle;
1993 obj.shm_fd = -1;
1994 obj.wait_fd = -1;
1995 obj.memory_map_size = 0;
1996 ustctl_release_object(app->key.sock, &obj);
1997
1998 rcu_read_unlock();
1999
2000 /* Quiescent wait after stopping trace */
2001 ustctl_wait_quiescent(app->key.sock);
2002
2003 return 0;
2004
2005error_rcu_unlock:
2006 rcu_read_unlock();
2007 return -1;
2008}
2009
5b4a0ec0
DG
2010/*
2011 * Start tracing for the UST session.
2012 */
421cb601
DG
2013int ust_app_start_trace_all(struct ltt_ust_session *usess)
2014{
2015 int ret = 0;
2016 struct cds_lfht_iter iter;
421cb601 2017 struct ust_app *app;
48842b30 2018
421cb601
DG
2019 DBG("Starting all UST traces");
2020
2021 rcu_read_lock();
421cb601 2022
5b4a0ec0 2023 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
421cb601 2024 ret = ust_app_start_trace(usess, app);
48842b30 2025 if (ret < 0) {
5b4a0ec0
DG
2026 /* Continue to next apps even on error */
2027 continue;
48842b30 2028 }
48842b30 2029 }
5b4a0ec0 2030
48842b30
DG
2031 rcu_read_unlock();
2032
2033 return 0;
2034}
487cf67c 2035
8be98f9a
MD
2036/*
2037 * Start tracing for the UST session.
2038 */
2039int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2040{
2041 int ret = 0;
2042 struct cds_lfht_iter iter;
2043 struct ust_app *app;
2044
2045 DBG("Stopping all UST traces");
2046
2047 rcu_read_lock();
2048
2049 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2050 ret = ust_app_stop_trace(usess, app);
2051 if (ret < 0) {
2052 /* Continue to next apps even on error */
2053 continue;
2054 }
2055 }
2056
2057 rcu_read_unlock();
2058
2059 return 0;
2060}
2061
84cd17c6
MD
2062/*
2063 * Destroy app UST session.
2064 */
2065int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2066{
2067 int ret = 0;
2068 struct cds_lfht_iter iter;
2069 struct ust_app *app;
2070
2071 DBG("Destroy all UST traces");
2072
2073 rcu_read_lock();
2074
2075 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2076 ret = ust_app_destroy_trace(usess, app);
2077 if (ret < 0) {
2078 /* Continue to next apps even on error */
2079 continue;
2080 }
2081 }
2082
2083 rcu_read_unlock();
2084
2085 return 0;
2086}
2087
5b4a0ec0
DG
2088/*
2089 * Add channels/events from UST global domain to registered apps at sock.
2090 */
487cf67c
DG
2091void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2092{
2093 int ret = 0;
487cf67c 2094 struct cds_lfht_iter iter;
487cf67c
DG
2095 struct ust_app *app;
2096 struct ust_app_session *ua_sess;
2097 struct ust_app_channel *ua_chan;
2098 struct ust_app_event *ua_event;
1f3580c7
DG
2099
2100 if (usess == NULL) {
5b4a0ec0 2101 ERR("No UST session on global update. Returning");
1f3580c7
DG
2102 goto error;
2103 }
2104
487cf67c
DG
2105 DBG2("UST app global update for app sock %d for session uid %d", sock,
2106 usess->uid);
2107
284d8f55
DG
2108 rcu_read_lock();
2109
487cf67c
DG
2110 app = find_app_by_sock(sock);
2111 if (app == NULL) {
2112 ERR("Failed to update app sock %d", sock);
2113 goto error;
2114 }
2115
421cb601 2116 ua_sess = create_ust_app_session(usess, app);
487cf67c 2117 if (ua_sess == NULL) {
487cf67c
DG
2118 goto error;
2119 }
2120
284d8f55
DG
2121 /*
2122 * We can iterate safely here over all UST app session sicne the create ust
2123 * app session above made a shadow copy of the UST global domain from the
2124 * ltt ust session.
2125 */
2126 cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
2127 ret = create_ust_channel(app, ua_sess, ua_chan);
2128 if (ret < 0) {
2129 /* FIXME: Should we quit here or continue... */
2130 continue;
487cf67c
DG
2131 }
2132
284d8f55
DG
2133 /* For each events */
2134 cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
2135 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2136 if (ret < 0) {
2137 /* FIXME: Should we quit here or continue... */
2138 continue;
487cf67c 2139 }
36dc12cc 2140 }
487cf67c
DG
2141 }
2142
36dc12cc 2143 if (usess->start_trace) {
421cb601 2144 ret = ust_app_start_trace(usess, app);
36dc12cc 2145 if (ret < 0) {
36dc12cc
DG
2146 goto error;
2147 }
2148
36dc12cc
DG
2149 DBG2("UST trace started for app pid %d", app->key.pid);
2150 }
2151
487cf67c
DG
2152error:
2153 rcu_read_unlock();
2154 return;
2155}
55cc08a6
DG
2156
2157/*
2158 * Add context to a specific channel for global UST domain.
2159 */
2160int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2161 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2162{
2163 int ret = 0;
2164 struct cds_lfht_node *ua_chan_node;
2165 struct cds_lfht_iter iter, uiter;
2166 struct ust_app_channel *ua_chan = NULL;
2167 struct ust_app_session *ua_sess;
2168 struct ust_app *app;
2169
2170 rcu_read_lock();
2171
2172 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2173 ua_sess = lookup_session_by_app(usess, app);
2174 if (ua_sess == NULL) {
2175 continue;
2176 }
2177
2178 /* Lookup channel in the ust app session */
2179 ua_chan_node = hashtable_lookup(ua_sess->channels,
2180 (void *)uchan->name, strlen(uchan->name), &uiter);
2181 if (ua_chan_node == NULL) {
2182 continue;
2183 }
2184 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2185 node);
2186
2187 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2188 if (ret < 0) {
2189 continue;
2190 }
2191 }
2192
2193 /* Add ltt UST context node to ltt UST channel */
2194 hashtable_add_unique(uchan->ctx, &uctx->node);
2195
2196 rcu_read_unlock();
2197 return ret;
2198}
2199
2200/*
2201 * Add context to a specific event in a channel for global UST domain.
2202 */
2203int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2204 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2205 struct ltt_ust_context *uctx)
2206{
2207 int ret = 0;
2208 struct cds_lfht_node *ua_chan_node, *ua_event_node;
2209 struct cds_lfht_iter iter, uiter;
2210 struct ust_app_session *ua_sess;
2211 struct ust_app_event *ua_event;
2212 struct ust_app_channel *ua_chan = NULL;
2213 struct ust_app *app;
2214
2215 rcu_read_lock();
2216
2217 cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2218 ua_sess = lookup_session_by_app(usess, app);
2219 if (ua_sess == NULL) {
2220 continue;
2221 }
2222
2223 /* Lookup channel in the ust app session */
2224 ua_chan_node = hashtable_lookup(ua_sess->channels,
2225 (void *)uchan->name, strlen(uchan->name), &uiter);
2226 if (ua_chan_node == NULL) {
2227 continue;
2228 }
2229 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2230 node);
2231
2232 ua_event_node = hashtable_lookup(ua_chan->events,
2233 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
2234 if (ua_event_node == NULL) {
2235 continue;
2236 }
2237 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2238 node);
2239
2240 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2241 if (ret < 0) {
2242 continue;
2243 }
2244 }
2245
2246 /* Add ltt UST context node to ltt UST event */
2247 hashtable_add_unique(uevent->ctx, &uctx->node);
2248
2249 rcu_read_unlock();
2250 return ret;
2251}
This page took 0.128618 seconds and 4 git commands to generate.