Fix: relayd metadata size
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
91d76f53
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM
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.
91d76f53
DG
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 *
d14d33bf
AM
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.
91d76f53
DG
16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
20#include <pthread.h>
21#include <stdio.h>
22#include <stdlib.h>
099e26bd 23#include <string.h>
aba8e916
DG
24#include <sys/stat.h>
25#include <sys/types.h>
099e26bd 26#include <unistd.h>
0df502fd 27#include <urcu/compiler.h>
bec39940 28
990570ed 29#include <common/common.h>
86acf0da 30#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 31
86acf0da
DG
32#include "fd-limit.h"
33#include "health.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 59 int ret;
bec39940 60 struct lttng_ht_iter iter;
55cc08a6
DG
61 struct ust_app_ctx *ua_ctx;
62
fc34caaa 63 /* Destroy each context of event */
bec39940
DG
64 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter.iter, ua_ctx,
65 node.node) {
66 ret = lttng_ht_del(ua_event->ctx, &iter);
55cc08a6
DG
67 assert(!ret);
68 delete_ust_app_ctx(sock, ua_ctx);
69 }
53a80697 70 free(ua_event->filter);
bec39940 71 lttng_ht_destroy(ua_event->ctx);
d80a6244 72
edb67388
DG
73 if (ua_event->obj != NULL) {
74 ustctl_release_object(sock, ua_event->obj);
75 free(ua_event->obj);
76 }
d80a6244
DG
77 free(ua_event);
78}
79
80/*
81 * Delete ust app stream safely. RCU read lock must be held before calling
82 * this function.
83 */
8b366481
DG
84static
85void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 86{
8b366481
DG
87 if (stream->obj) {
88 ustctl_release_object(sock, stream->obj);
4063050c 89 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
90 free(stream->obj);
91 }
84cd17c6 92 free(stream);
d80a6244
DG
93}
94
95/*
96 * Delete ust app channel safely. RCU read lock must be held before calling
97 * this function.
98 */
8b366481
DG
99static
100void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
d80a6244
DG
101{
102 int ret;
bec39940 103 struct lttng_ht_iter iter;
d80a6244 104 struct ust_app_event *ua_event;
55cc08a6 105 struct ust_app_ctx *ua_ctx;
d80a6244
DG
106 struct ltt_ust_stream *stream, *stmp;
107
55cc08a6 108 /* Wipe stream */
d80a6244 109 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 110 cds_list_del(&stream->list);
d80a6244
DG
111 delete_ust_app_stream(sock, stream);
112 }
113
55cc08a6 114 /* Wipe context */
bec39940
DG
115 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
116 ret = lttng_ht_del(ua_chan->ctx, &iter);
55cc08a6
DG
117 assert(!ret);
118 delete_ust_app_ctx(sock, ua_ctx);
119 }
bec39940 120 lttng_ht_destroy(ua_chan->ctx);
d80a6244 121
55cc08a6 122 /* Wipe events */
bec39940
DG
123 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
124 node.node) {
125 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 126 assert(!ret);
d80a6244
DG
127 delete_ust_app_event(sock, ua_event);
128 }
bec39940 129 lttng_ht_destroy(ua_chan->events);
edb67388
DG
130
131 if (ua_chan->obj != NULL) {
132 ustctl_release_object(sock, ua_chan->obj);
4063050c 133 lttng_fd_put(LTTNG_FD_APPS, 2);
edb67388
DG
134 free(ua_chan->obj);
135 }
84cd17c6 136 free(ua_chan);
d80a6244
DG
137}
138
139/*
140 * Delete ust app session safely. RCU read lock must be held before calling
141 * this function.
142 */
8b366481
DG
143static
144void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
d80a6244
DG
145{
146 int ret;
bec39940 147 struct lttng_ht_iter iter;
d80a6244
DG
148 struct ust_app_channel *ua_chan;
149
150 if (ua_sess->metadata) {
8b366481
DG
151 if (ua_sess->metadata->stream_obj) {
152 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
4063050c 153 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
154 free(ua_sess->metadata->stream_obj);
155 }
156 if (ua_sess->metadata->obj) {
157 ustctl_release_object(sock, ua_sess->metadata->obj);
4063050c 158 lttng_fd_put(LTTNG_FD_APPS, 2);
8b366481
DG
159 free(ua_sess->metadata->obj);
160 }
a2c0da86 161 trace_ust_destroy_metadata(ua_sess->metadata);
d80a6244
DG
162 }
163
bec39940
DG
164 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
165 node.node) {
166 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 167 assert(!ret);
d80a6244
DG
168 delete_ust_app_channel(sock, ua_chan);
169 }
bec39940 170 lttng_ht_destroy(ua_sess->channels);
d80a6244 171
aee6bafd
MD
172 if (ua_sess->handle != -1) {
173 ustctl_release_handle(sock, ua_sess->handle);
174 }
8b366481 175 free(ua_sess);
d80a6244 176}
91d76f53
DG
177
178/*
284d8f55
DG
179 * Delete a traceable application structure from the global list. Never call
180 * this function outside of a call_rcu call.
91d76f53 181 */
8b366481
DG
182static
183void delete_ust_app(struct ust_app *app)
91d76f53 184{
8b366481 185 int ret, sock;
bec39940 186 struct lttng_ht_iter iter;
284d8f55 187 struct ust_app_session *ua_sess;
44d3bd01 188
f6a9efaa 189 rcu_read_lock();
44d3bd01 190
d80a6244 191 /* Delete ust app sessions info */
852d0037
DG
192 sock = app->sock;
193 app->sock = -1;
d80a6244 194
8b366481 195 /* Wipe sessions */
bec39940
DG
196 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
197 node.node) {
198 ret = lttng_ht_del(app->sessions, &iter);
525b0740 199 assert(!ret);
852d0037 200 delete_ust_app_session(app->sock, ua_sess);
d80a6244 201 }
bec39940 202 lttng_ht_destroy(app->sessions);
d80a6244 203
6414a713 204 /*
852d0037
DG
205 * Wait until we have deleted the application from the sock hash table
206 * before closing this socket, otherwise an application could re-use the
207 * socket ID and race with the teardown, using the same hash table entry.
208 *
209 * It's OK to leave the close in call_rcu. We want it to stay unique for
210 * all RCU readers that could run concurrently with unregister app,
211 * therefore we _need_ to only close that socket after a grace period. So
212 * it should stay in this RCU callback.
213 *
214 * This close() is a very important step of the synchronization model so
215 * every modification to this function must be carefully reviewed.
6414a713 216 */
799e2c4f
MD
217 ret = close(sock);
218 if (ret) {
219 PERROR("close");
220 }
4063050c 221 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 222
852d0037 223 DBG2("UST app pid %d deleted", app->pid);
284d8f55 224 free(app);
bec39940 225
f6a9efaa 226 rcu_read_unlock();
099e26bd
DG
227}
228
229/*
f6a9efaa 230 * URCU intermediate call to delete an UST app.
099e26bd 231 */
8b366481
DG
232static
233void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 234{
bec39940
DG
235 struct lttng_ht_node_ulong *node =
236 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 237 struct ust_app *app =
852d0037 238 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 239
852d0037 240 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 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;
bec39940 260 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
8b366481
DG
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;
bec39940
DG
290 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
291 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
292 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
DG
293
294 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
295
296 /* Copy attributes */
297 if (attr) {
298 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
299 }
300
301 DBG3("UST app channel %s allocated", ua_chan->name);
302
303 return ua_chan;
304
305error:
306 return NULL;
307}
308
309/*
310 * Alloc new UST app event.
311 */
312static
313struct ust_app_event *alloc_ust_app_event(char *name,
314 struct lttng_ust_event *attr)
315{
316 struct ust_app_event *ua_event;
317
318 /* Init most of the default value by allocating and zeroing */
319 ua_event = zmalloc(sizeof(struct ust_app_event));
320 if (ua_event == NULL) {
321 PERROR("malloc");
322 goto error;
323 }
324
325 ua_event->enabled = 1;
326 strncpy(ua_event->name, name, sizeof(ua_event->name));
327 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940
DG
328 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
329 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
DG
330
331 /* Copy attributes */
332 if (attr) {
333 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
334 }
335
336 DBG3("UST app event %s allocated", ua_event->name);
337
338 return ua_event;
339
340error:
341 return NULL;
342}
343
344/*
345 * Alloc new UST app context.
346 */
347static
348struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
349{
350 struct ust_app_ctx *ua_ctx;
351
352 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
353 if (ua_ctx == NULL) {
354 goto error;
355 }
356
357 if (uctx) {
358 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
359 }
360
361 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
362
363error:
364 return ua_ctx;
365}
366
099e26bd 367/*
421cb601
DG
368 * Find an ust_app using the sock and return it. RCU read side lock must be
369 * held before calling this helper function.
099e26bd 370 */
8b366481
DG
371static
372struct ust_app *find_app_by_sock(int sock)
099e26bd 373{
bec39940 374 struct lttng_ht_node_ulong *node;
bec39940 375 struct lttng_ht_iter iter;
f6a9efaa 376
852d0037 377 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 378 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
379 if (node == NULL) {
380 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
381 goto error;
382 }
852d0037
DG
383
384 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
385
386error:
387 return NULL;
099e26bd
DG
388}
389
55cc08a6
DG
390/*
391 * Create the channel context on the tracer.
392 */
393static
394int create_ust_channel_context(struct ust_app_channel *ua_chan,
395 struct ust_app_ctx *ua_ctx, struct ust_app *app)
396{
397 int ret;
398
86acf0da
DG
399 health_code_update(&health_thread_cmd);
400
852d0037 401 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
402 ua_chan->obj, &ua_ctx->obj);
403 if (ret < 0) {
404 goto error;
405 }
406
407 ua_ctx->handle = ua_ctx->obj->handle;
408
727d5404 409 DBG2("UST app context created successfully for channel %s", ua_chan->name);
55cc08a6
DG
410
411error:
86acf0da 412 health_code_update(&health_thread_cmd);
55cc08a6
DG
413 return ret;
414}
415
416/*
417 * Create the event context on the tracer.
418 */
419static
420int create_ust_event_context(struct ust_app_event *ua_event,
421 struct ust_app_ctx *ua_ctx, struct ust_app *app)
422{
423 int ret;
424
86acf0da
DG
425 health_code_update(&health_thread_cmd);
426
852d0037 427 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
428 ua_event->obj, &ua_ctx->obj);
429 if (ret < 0) {
430 goto error;
431 }
432
433 ua_ctx->handle = ua_ctx->obj->handle;
434
727d5404 435 DBG2("UST app context created successfully for event %s", ua_event->name);
55cc08a6
DG
436
437error:
86acf0da 438 health_code_update(&health_thread_cmd);
55cc08a6
DG
439 return ret;
440}
441
53a80697
MD
442/*
443 * Set the filter on the tracer.
444 */
445static
446int set_ust_event_filter(struct ust_app_event *ua_event,
447 struct ust_app *app)
448{
449 int ret;
450
86acf0da
DG
451 health_code_update(&health_thread_cmd);
452
53a80697 453 if (!ua_event->filter) {
86acf0da
DG
454 ret = 0;
455 goto error;
53a80697
MD
456 }
457
458 ret = ustctl_set_filter(app->sock, ua_event->filter,
459 ua_event->obj);
460 if (ret < 0) {
461 goto error;
462 }
463
464 DBG2("UST filter set successfully for event %s", ua_event->name);
465
466error:
86acf0da 467 health_code_update(&health_thread_cmd);
53a80697
MD
468 return ret;
469}
470
9730260e
DG
471/*
472 * Disable the specified event on to UST tracer for the UST session.
473 */
474static int disable_ust_event(struct ust_app *app,
475 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
476{
477 int ret;
478
86acf0da
DG
479 health_code_update(&health_thread_cmd);
480
852d0037 481 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e
DG
482 if (ret < 0) {
483 ERR("UST app event %s disable failed for app (pid: %d) "
484 "and session handle %d with ret %d",
852d0037 485 ua_event->attr.name, app->pid, ua_sess->handle, ret);
9730260e
DG
486 goto error;
487 }
488
489 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 490 ua_event->attr.name, app->pid);
9730260e
DG
491
492error:
86acf0da 493 health_code_update(&health_thread_cmd);
9730260e
DG
494 return ret;
495}
496
78f0bacd
DG
497/*
498 * Disable the specified channel on to UST tracer for the UST session.
499 */
500static int disable_ust_channel(struct ust_app *app,
501 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
502{
503 int ret;
504
86acf0da
DG
505 health_code_update(&health_thread_cmd);
506
852d0037 507 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
DG
508 if (ret < 0) {
509 ERR("UST app channel %s disable failed for app (pid: %d) "
510 "and session handle %d with ret %d",
852d0037 511 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
512 goto error;
513 }
514
78f0bacd 515 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 516 ua_chan->name, app->pid);
78f0bacd
DG
517
518error:
86acf0da 519 health_code_update(&health_thread_cmd);
78f0bacd
DG
520 return ret;
521}
522
523/*
524 * Enable the specified channel on to UST tracer for the UST session.
525 */
526static int enable_ust_channel(struct ust_app *app,
527 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
528{
529 int ret;
530
86acf0da
DG
531 health_code_update(&health_thread_cmd);
532
852d0037 533 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd
DG
534 if (ret < 0) {
535 ERR("UST app channel %s enable failed for app (pid: %d) "
536 "and session handle %d with ret %d",
852d0037 537 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
538 goto error;
539 }
540
541 ua_chan->enabled = 1;
542
543 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 544 ua_chan->name, app->pid);
78f0bacd
DG
545
546error:
86acf0da 547 health_code_update(&health_thread_cmd);
78f0bacd
DG
548 return ret;
549}
550
edb67388
DG
551/*
552 * Enable the specified event on to UST tracer for the UST session.
553 */
554static int enable_ust_event(struct ust_app *app,
555 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
556{
557 int ret;
558
86acf0da
DG
559 health_code_update(&health_thread_cmd);
560
852d0037 561 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388
DG
562 if (ret < 0) {
563 ERR("UST app event %s enable failed for app (pid: %d) "
564 "and session handle %d with ret %d",
852d0037 565 ua_event->attr.name, app->pid, ua_sess->handle, ret);
edb67388
DG
566 goto error;
567 }
568
569 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 570 ua_event->attr.name, app->pid);
edb67388
DG
571
572error:
86acf0da 573 health_code_update(&health_thread_cmd);
edb67388
DG
574 return ret;
575}
576
099e26bd 577/*
5b4a0ec0 578 * Open metadata onto the UST tracer for a UST session.
0177d773 579 */
5b4a0ec0
DG
580static int open_ust_metadata(struct ust_app *app,
581 struct ust_app_session *ua_sess)
0177d773 582{
5b4a0ec0
DG
583 int ret;
584 struct lttng_ust_channel_attr uattr;
0177d773 585
86acf0da
DG
586 health_code_update(&health_thread_cmd);
587
5b4a0ec0
DG
588 uattr.overwrite = ua_sess->metadata->attr.overwrite;
589 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
590 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
591 uattr.switch_timer_interval =
592 ua_sess->metadata->attr.switch_timer_interval;
593 uattr.read_timer_interval =
594 ua_sess->metadata->attr.read_timer_interval;
595 uattr.output = ua_sess->metadata->attr.output;
596
4063050c
MD
597 /* We are going to receive 2 fds, we need to reserve them. */
598 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
599 if (ret < 0) {
600 ERR("Exhausted number of available FD upon metadata open");
601 goto error;
602 }
5b4a0ec0 603 /* UST tracer metadata creation */
852d0037 604 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
605 &ua_sess->metadata->obj);
606 if (ret < 0) {
fc34caaa 607 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 608 app->pid, ret);
f6a9efaa 609 goto error;
0177d773 610 }
f6a9efaa 611
6d3686da
DG
612 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
613
f6a9efaa 614error:
86acf0da 615 health_code_update(&health_thread_cmd);
5b4a0ec0 616 return ret;
91d76f53
DG
617}
618
619/*
5b4a0ec0 620 * Create stream onto the UST tracer for a UST session.
91d76f53 621 */
5b4a0ec0
DG
622static int create_ust_stream(struct ust_app *app,
623 struct ust_app_session *ua_sess)
91d76f53 624{
5b4a0ec0 625 int ret;
421cb601 626
86acf0da
DG
627 health_code_update(&health_thread_cmd);
628
4063050c
MD
629 /* We are going to receive 2 fds, we need to reserve them. */
630 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
631 if (ret < 0) {
632 ERR("Exhausted number of available FD upon metadata stream create");
633 goto error;
634 }
852d0037 635 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
636 &ua_sess->metadata->stream_obj);
637 if (ret < 0) {
638 ERR("UST create metadata stream failed");
421cb601 639 goto error;
91d76f53 640 }
421cb601 641
421cb601 642error:
86acf0da 643 health_code_update(&health_thread_cmd);
5b4a0ec0 644 return ret;
91d76f53
DG
645}
646
b551a063 647/*
5b4a0ec0 648 * Create the specified channel onto the UST tracer for a UST session.
b551a063 649 */
5b4a0ec0
DG
650static int create_ust_channel(struct ust_app *app,
651 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 652{
5b4a0ec0 653 int ret;
b551a063 654
86acf0da
DG
655 health_code_update(&health_thread_cmd);
656
5b4a0ec0 657 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
658
659 /* We are going to receive 2 fds, we need to reserve them. */
660 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
661 if (ret < 0) {
662 ERR("Exhausted number of available FD upon create channel");
663 goto error;
664 }
86acf0da
DG
665
666 health_code_update(&health_thread_cmd);
667
852d0037 668 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
669 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
670 if (ret < 0) {
58f3ca76 671 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 672 "and session handle %d with ret %d",
852d0037 673 ua_chan->name, app->pid, app->sock,
5b4a0ec0 674 ua_sess->handle, ret);
4063050c 675 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
676 goto error;
677 }
678
5b4a0ec0 679 ua_chan->handle = ua_chan->obj->handle;
b551a063 680
5b4a0ec0 681 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 682 ua_chan->name, app->pid, app->sock);
b551a063 683
86acf0da
DG
684 health_code_update(&health_thread_cmd);
685
8535a6d9
DG
686 /* If channel is not enabled, disable it on the tracer */
687 if (!ua_chan->enabled) {
688 ret = disable_ust_channel(app, ua_sess, ua_chan);
689 if (ret < 0) {
690 goto error;
691 }
692 }
693
b551a063 694error:
86acf0da 695 health_code_update(&health_thread_cmd);
b551a063
DG
696 return ret;
697}
698
91d76f53 699/*
5b4a0ec0 700 * Create the specified event onto the UST tracer for a UST session.
91d76f53 701 */
edb67388
DG
702static
703int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
704 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 705{
5b4a0ec0 706 int ret = 0;
284d8f55 707
86acf0da
DG
708 health_code_update(&health_thread_cmd);
709
5b4a0ec0 710 /* Create UST event on tracer */
852d0037 711 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
712 &ua_event->obj);
713 if (ret < 0) {
a027b2d2 714 if (ret == -EEXIST || ret == -EPERM) {
fc34caaa
DG
715 ret = 0;
716 goto error;
717 }
5b4a0ec0 718 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 719 ua_event->attr.name, app->pid, ret);
5b4a0ec0 720 goto error;
91d76f53 721 }
f6a9efaa 722
5b4a0ec0 723 ua_event->handle = ua_event->obj->handle;
284d8f55 724
5b4a0ec0 725 DBG2("UST app event %s created successfully for pid:%d",
852d0037 726 ua_event->attr.name, app->pid);
f6a9efaa 727
86acf0da
DG
728 health_code_update(&health_thread_cmd);
729
8535a6d9 730 /* If event not enabled, disable it on the tracer */
fc34caaa 731 if (ua_event->enabled == 0) {
8535a6d9
DG
732 ret = disable_ust_event(app, ua_sess, ua_event);
733 if (ret < 0) {
fc34caaa
DG
734 /*
735 * If we hit an EPERM, something is wrong with our disable call. If
736 * we get an EEXIST, there is a problem on the tracer side since we
737 * just created it.
738 */
739 switch (ret) {
740 case -EPERM:
741 /* Code flow problem */
742 assert(0);
743 case -EEXIST:
744 /* It's OK for our use case. */
745 ret = 0;
746 break;
747 default:
748 break;
749 }
8535a6d9
DG
750 goto error;
751 }
752 }
753
5b4a0ec0 754error:
86acf0da 755 health_code_update(&health_thread_cmd);
5b4a0ec0 756 return ret;
91d76f53 757}
48842b30 758
5b4a0ec0
DG
759/*
760 * Copy data between an UST app event and a LTT event.
761 */
421cb601 762static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
763 struct ltt_ust_event *uevent)
764{
bec39940 765 struct lttng_ht_iter iter;
55cc08a6
DG
766 struct ltt_ust_context *uctx;
767 struct ust_app_ctx *ua_ctx;
768
48842b30
DG
769 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
770 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
771
fc34caaa
DG
772 ua_event->enabled = uevent->enabled;
773
5b4a0ec0
DG
774 /* Copy event attributes */
775 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
776
53a80697
MD
777 /* Copy filter bytecode */
778 if (uevent->filter) {
779 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
780 uevent->filter->len);
781 if (!ua_event->filter) {
782 return;
783 }
784 memcpy(ua_event->filter, uevent->filter,
785 sizeof(*ua_event->filter) + uevent->filter->len);
786 }
bec39940 787 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
788 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
789 if (ua_ctx == NULL) {
fc34caaa
DG
790 /* malloc() failed. We should simply stop */
791 return;
55cc08a6 792 }
fc34caaa 793
bec39940
DG
794 lttng_ht_node_init_ulong(&ua_ctx->node,
795 (unsigned long) ua_ctx->ctx.ctx);
796 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 797 }
48842b30
DG
798}
799
5b4a0ec0
DG
800/*
801 * Copy data between an UST app channel and a LTT channel.
802 */
421cb601 803static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
804 struct ltt_ust_channel *uchan)
805{
bec39940
DG
806 struct lttng_ht_iter iter;
807 struct lttng_ht_node_str *ua_event_node;
48842b30 808 struct ltt_ust_event *uevent;
55cc08a6 809 struct ltt_ust_context *uctx;
48842b30 810 struct ust_app_event *ua_event;
55cc08a6 811 struct ust_app_ctx *ua_ctx;
48842b30 812
fc34caaa 813 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
814
815 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
816 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
817 /* Copy event attributes */
818 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 819
fc34caaa
DG
820 ua_chan->enabled = uchan->enabled;
821
bec39940 822 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
823 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
824 if (ua_ctx == NULL) {
825 continue;
826 }
bec39940
DG
827 lttng_ht_node_init_ulong(&ua_ctx->node,
828 (unsigned long) ua_ctx->ctx.ctx);
829 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 830 }
48842b30 831
421cb601 832 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
833 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
834 struct lttng_ht_iter uiter;
ba767faf 835
bec39940
DG
836 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
837 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 838 if (ua_event_node == NULL) {
421cb601 839 DBG2("UST event %s not found on shadow copy channel",
48842b30 840 uevent->attr.name);
284d8f55 841 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 842 if (ua_event == NULL) {
5b4a0ec0 843 continue;
48842b30 844 }
421cb601 845 shadow_copy_event(ua_event, uevent);
bec39940 846 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 847 }
48842b30
DG
848 }
849
fc34caaa 850 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
851}
852
5b4a0ec0
DG
853/*
854 * Copy data between a UST app session and a regular LTT session.
855 */
421cb601 856static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 857 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 858{
bec39940
DG
859 struct lttng_ht_node_str *ua_chan_node;
860 struct lttng_ht_iter iter;
48842b30
DG
861 struct ltt_ust_channel *uchan;
862 struct ust_app_channel *ua_chan;
477d7741
MD
863 time_t rawtime;
864 struct tm *timeinfo;
865 char datetime[16];
866 int ret;
867
868 /* Get date and time for unique app path */
869 time(&rawtime);
870 timeinfo = localtime(&rawtime);
871 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 872
421cb601 873 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 874
a991f516 875 ua_sess->id = usess->id;
6df2e2c9
MD
876 ua_sess->uid = usess->uid;
877 ua_sess->gid = usess->gid;
48842b30 878
00e2e675
DG
879 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
880 datetime);
477d7741
MD
881 if (ret < 0) {
882 PERROR("asprintf UST shadow copy session");
883 /* TODO: We cannot return an error from here.. */
884 assert(0);
885 }
886
48842b30
DG
887 /* TODO: support all UST domain */
888
889 /* Iterate over all channels in global domain. */
bec39940
DG
890 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
891 uchan, node.node) {
892 struct lttng_ht_iter uiter;
ba767faf 893
bec39940
DG
894 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
895 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 896 if (ua_chan_node != NULL) {
fc34caaa 897 /* Session exist. Contiuing. */
5b4a0ec0
DG
898 continue;
899 }
421cb601 900
5b4a0ec0
DG
901 DBG2("Channel %s not found on shadow session copy, creating it",
902 uchan->name);
903 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
904 if (ua_chan == NULL) {
fc34caaa 905 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 906 continue;
48842b30
DG
907 }
908
5b4a0ec0 909 shadow_copy_channel(ua_chan, uchan);
bec39940 910 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
911 }
912}
913
78f0bacd
DG
914/*
915 * Lookup sesison wrapper.
916 */
84cd17c6
MD
917static
918void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 919 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
920{
921 /* Get right UST app session from app */
2c348c10 922 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
923}
924
421cb601
DG
925/*
926 * Return ust app session from the app session hashtable using the UST session
a991f516 927 * id.
421cb601 928 */
48842b30
DG
929static struct ust_app_session *lookup_session_by_app(
930 struct ltt_ust_session *usess, struct ust_app *app)
931{
bec39940
DG
932 struct lttng_ht_iter iter;
933 struct lttng_ht_node_ulong *node;
48842b30 934
84cd17c6 935 __lookup_session_by_app(usess, app, &iter);
bec39940 936 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
937 if (node == NULL) {
938 goto error;
939 }
940
941 return caa_container_of(node, struct ust_app_session, node);
942
943error:
944 return NULL;
945}
946
421cb601
DG
947/*
948 * Create a UST session onto the tracer of app and add it the session
949 * hashtable.
950 *
951 * Return ust app session or NULL on error.
952 */
953static struct ust_app_session *create_ust_app_session(
954 struct ltt_ust_session *usess, struct ust_app *app)
955{
956 int ret;
957 struct ust_app_session *ua_sess;
958
86acf0da
DG
959 health_code_update(&health_thread_cmd);
960
421cb601
DG
961 ua_sess = lookup_session_by_app(usess, app);
962 if (ua_sess == NULL) {
a991f516 963 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 964 app->pid, usess->id);
421cb601
DG
965 ua_sess = alloc_ust_app_session();
966 if (ua_sess == NULL) {
967 /* Only malloc can failed so something is really wrong */
fc34caaa 968 goto end;
421cb601 969 }
477d7741 970 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
971 }
972
86acf0da
DG
973 health_code_update(&health_thread_cmd);
974
421cb601 975 if (ua_sess->handle == -1) {
852d0037 976 ret = ustctl_create_session(app->sock);
421cb601 977 if (ret < 0) {
852d0037 978 ERR("Creating session for app pid %d", app->pid);
915d047c
DG
979 /* This means that the tracer is gone... */
980 ua_sess = (void*) -1UL;
421cb601
DG
981 goto error;
982 }
983
421cb601
DG
984 ua_sess->handle = ret;
985
986 /* Add ust app session to app's HT */
2c348c10 987 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 988 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
989
990 DBG2("UST app session created successfully with handle %d", ret);
991 }
992
fc34caaa 993end:
86acf0da 994 health_code_update(&health_thread_cmd);
421cb601
DG
995 return ua_sess;
996
997error:
fc34caaa 998 delete_ust_app_session(-1, ua_sess);
86acf0da 999 health_code_update(&health_thread_cmd);
421cb601
DG
1000 return NULL;
1001}
1002
55cc08a6
DG
1003/*
1004 * Create a context for the channel on the tracer.
1005 */
1006static
1007int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1008 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1009 struct ust_app *app)
1010{
1011 int ret = 0;
bec39940
DG
1012 struct lttng_ht_iter iter;
1013 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1014 struct ust_app_ctx *ua_ctx;
1015
1016 DBG2("UST app adding context to channel %s", ua_chan->name);
1017
bec39940
DG
1018 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1019 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1020 if (node != NULL) {
1021 ret = -EEXIST;
1022 goto error;
1023 }
1024
1025 ua_ctx = alloc_ust_app_ctx(uctx);
1026 if (ua_ctx == NULL) {
1027 /* malloc failed */
1028 ret = -1;
1029 goto error;
1030 }
1031
bec39940
DG
1032 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1033 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1034
1035 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1036 if (ret < 0) {
1037 goto error;
1038 }
1039
1040error:
1041 return ret;
1042}
1043
1044/*
1045 * Create an UST context and enable it for the event on the tracer.
1046 */
1047static
1048int create_ust_app_event_context(struct ust_app_session *ua_sess,
1049 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1050 struct ust_app *app)
1051{
1052 int ret = 0;
bec39940
DG
1053 struct lttng_ht_iter iter;
1054 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1055 struct ust_app_ctx *ua_ctx;
1056
1057 DBG2("UST app adding context to event %s", ua_event->name);
1058
bec39940
DG
1059 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1060 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1061 if (node != NULL) {
1062 ret = -EEXIST;
1063 goto error;
1064 }
1065
1066 ua_ctx = alloc_ust_app_ctx(uctx);
1067 if (ua_ctx == NULL) {
1068 /* malloc failed */
1069 ret = -1;
1070 goto error;
1071 }
1072
bec39940
DG
1073 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1074 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
1075
1076 ret = create_ust_event_context(ua_event, ua_ctx, app);
1077 if (ret < 0) {
1078 goto error;
1079 }
1080
1081error:
1082 return ret;
1083}
1084
53a80697
MD
1085/*
1086 * Set UST filter for the event on the tracer.
1087 */
1088static
1089int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1090 struct ust_app_event *ua_event,
1091 struct lttng_filter_bytecode *bytecode,
1092 struct ust_app *app)
1093{
1094 int ret = 0;
1095
1096 DBG2("UST app adding context to event %s", ua_event->name);
1097
1098 /* Copy filter bytecode */
1099 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1100 if (!ua_event->filter) {
1101 return -ENOMEM;
1102 }
1103 memcpy(ua_event->filter, bytecode,
1104 sizeof(*ua_event->filter) + bytecode->len);
1105 ret = set_ust_event_filter(ua_event, app);
1106 if (ret < 0) {
1107 goto error;
1108 }
1109
1110error:
1111 return ret;
1112}
1113
edb67388
DG
1114/*
1115 * Enable on the tracer side a ust app event for the session and channel.
1116 */
1117static
1118int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1119 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1120{
1121 int ret;
1122
1123 ret = enable_ust_event(app, ua_sess, ua_event);
1124 if (ret < 0) {
1125 goto error;
1126 }
1127
1128 ua_event->enabled = 1;
1129
1130error:
1131 return ret;
1132}
1133
9730260e
DG
1134/*
1135 * Disable on the tracer side a ust app event for the session and channel.
1136 */
1137static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1138 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1139{
1140 int ret;
1141
1142 ret = disable_ust_event(app, ua_sess, ua_event);
1143 if (ret < 0) {
1144 goto error;
1145 }
1146
1147 ua_event->enabled = 0;
1148
1149error:
1150 return ret;
1151}
1152
78f0bacd
DG
1153/*
1154 * Lookup ust app channel for session and disable it on the tracer side.
1155 */
8535a6d9
DG
1156static
1157int disable_ust_app_channel(struct ust_app_session *ua_sess,
1158 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1159{
8535a6d9 1160 int ret;
78f0bacd
DG
1161
1162 ret = disable_ust_channel(app, ua_sess, ua_chan);
1163 if (ret < 0) {
1164 goto error;
1165 }
1166
8535a6d9
DG
1167 ua_chan->enabled = 0;
1168
78f0bacd
DG
1169error:
1170 return ret;
1171}
1172
1173/*
1174 * Lookup ust app channel for session and enable it on the tracer side.
1175 */
1176static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1177 struct ltt_ust_channel *uchan, struct ust_app *app)
1178{
1179 int ret = 0;
bec39940
DG
1180 struct lttng_ht_iter iter;
1181 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1182 struct ust_app_channel *ua_chan;
1183
bec39940
DG
1184 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1185 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1186 if (ua_chan_node == NULL) {
a991f516
MD
1187 DBG2("Unable to find channel %s in ust session id %u",
1188 uchan->name, ua_sess->id);
78f0bacd
DG
1189 goto error;
1190 }
1191
1192 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1193
1194 ret = enable_ust_channel(app, ua_sess, ua_chan);
1195 if (ret < 0) {
1196 goto error;
1197 }
1198
1199error:
1200 return ret;
1201}
1202
284d8f55 1203/*
5b4a0ec0 1204 * Create UST app channel and create it on the tracer.
284d8f55 1205 */
5b4a0ec0
DG
1206static struct ust_app_channel *create_ust_app_channel(
1207 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1208 struct ust_app *app)
1209{
1210 int ret = 0;
bec39940
DG
1211 struct lttng_ht_iter iter;
1212 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1213 struct ust_app_channel *ua_chan;
1214
1215 /* Lookup channel in the ust app session */
bec39940
DG
1216 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1217 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1218 if (ua_chan_node != NULL) {
5b4a0ec0 1219 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1220 goto end;
5b4a0ec0
DG
1221 }
1222
fc34caaa
DG
1223 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1224 if (ua_chan == NULL) {
1225 /* Only malloc can fail here */
1226 goto error;
1227 }
1228 shadow_copy_channel(ua_chan, uchan);
1229
5b4a0ec0
DG
1230 ret = create_ust_channel(app, ua_sess, ua_chan);
1231 if (ret < 0) {
fc34caaa
DG
1232 /* Not found previously means that it does not exist on the tracer */
1233 assert(ret != -EEXIST);
5b4a0ec0
DG
1234 goto error;
1235 }
1236
58f3ca76
DG
1237 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1238
fc34caaa 1239 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1240 app->pid);
fc34caaa
DG
1241
1242end:
5b4a0ec0
DG
1243 return ua_chan;
1244
1245error:
fc34caaa 1246 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1247 return NULL;
1248}
1249
1250/*
1251 * Create UST app event and create it on the tracer side.
1252 */
edb67388
DG
1253static
1254int create_ust_app_event(struct ust_app_session *ua_sess,
1255 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1256 struct ust_app *app)
284d8f55 1257{
edb67388 1258 int ret = 0;
bec39940
DG
1259 struct lttng_ht_iter iter;
1260 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1261 struct ust_app_event *ua_event;
284d8f55 1262
5b4a0ec0 1263 /* Get event node */
bec39940
DG
1264 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1265 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1266 if (ua_event_node != NULL) {
fc34caaa 1267 ret = -EEXIST;
edb67388
DG
1268 goto end;
1269 }
5b4a0ec0 1270
edb67388
DG
1271 /* Does not exist so create one */
1272 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1273 if (ua_event == NULL) {
1274 /* Only malloc can failed so something is really wrong */
1275 ret = -ENOMEM;
fc34caaa 1276 goto end;
5b4a0ec0 1277 }
edb67388 1278 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1279
edb67388 1280 /* Create it on the tracer side */
5b4a0ec0 1281 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1282 if (ret < 0) {
fc34caaa
DG
1283 /* Not found previously means that it does not exist on the tracer */
1284 assert(ret != -EEXIST);
284d8f55
DG
1285 goto error;
1286 }
1287
bec39940 1288 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1289
fc34caaa 1290 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1291 app->pid);
7f79d3a1 1292
edb67388 1293end:
fc34caaa
DG
1294 return ret;
1295
5b4a0ec0 1296error:
fc34caaa
DG
1297 /* Valid. Calling here is already in a read side lock */
1298 delete_ust_app_event(-1, ua_event);
edb67388 1299 return ret;
5b4a0ec0
DG
1300}
1301
1302/*
1303 * Create UST metadata and open it on the tracer side.
1304 */
1305static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1306 char *pathname, struct ust_app *app)
1307{
1308 int ret = 0;
1309
1310 if (ua_sess->metadata == NULL) {
1311 /* Allocate UST metadata */
1312 ua_sess->metadata = trace_ust_create_metadata(pathname);
1313 if (ua_sess->metadata == NULL) {
fc34caaa 1314 /* malloc() failed */
5b4a0ec0
DG
1315 goto error;
1316 }
1317
1318 ret = open_ust_metadata(app, ua_sess);
1319 if (ret < 0) {
7db205b5
DG
1320 DBG3("Opening metadata failed. Cleaning up memory");
1321
fc34caaa
DG
1322 /* Cleanup failed metadata struct */
1323 free(ua_sess->metadata);
7db205b5
DG
1324 /*
1325 * This is very important because delete_ust_app_session check if
1326 * the pointer is null or not in order to delete the metadata.
1327 */
1328 ua_sess->metadata = NULL;
5b4a0ec0
DG
1329 goto error;
1330 }
1331
852d0037 1332 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1333 }
1334
1335 /* Open UST metadata stream */
1336 if (ua_sess->metadata->stream_obj == NULL) {
1337 ret = create_ust_stream(app, ua_sess);
1338 if (ret < 0) {
1339 goto error;
1340 }
1341
477d7741
MD
1342 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1343 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1344 if (ret < 0) {
1345 PERROR("asprintf UST create stream");
1346 goto error;
1347 }
1348
1349 DBG2("UST metadata stream object created for app pid %d",
852d0037 1350 app->pid);
5b4a0ec0
DG
1351 } else {
1352 ERR("Attempting to create stream without metadata opened");
1353 goto error;
1354 }
1355
1356 return 0;
1357
1358error:
1359 return -1;
1360}
1361
1362/*
1363 * Return pointer to traceable apps list.
1364 */
bec39940 1365struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1366{
1367 return ust_app_ht;
1368}
1369
1370/*
1371 * Return ust app pointer or NULL if not found.
1372 */
1373struct ust_app *ust_app_find_by_pid(pid_t pid)
1374{
bec39940
DG
1375 struct lttng_ht_node_ulong *node;
1376 struct lttng_ht_iter iter;
5b4a0ec0
DG
1377
1378 rcu_read_lock();
bec39940
DG
1379 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1380 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1381 if (node == NULL) {
1382 DBG2("UST app no found with pid %d", pid);
1383 goto error;
1384 }
1385 rcu_read_unlock();
1386
1387 DBG2("Found UST app by pid %d", pid);
1388
852d0037 1389 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1390
1391error:
1392 rcu_read_unlock();
1393 return NULL;
1394}
1395
1396/*
1397 * Using pid and uid (of the app), allocate a new ust_app struct and
1398 * add it to the global traceable app list.
1399 *
0df502fd
MD
1400 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1401 * bitness is not supported.
5b4a0ec0
DG
1402 */
1403int ust_app_register(struct ust_register_msg *msg, int sock)
1404{
1405 struct ust_app *lta;
799e2c4f 1406 int ret;
5b4a0ec0 1407
7753dea8
MD
1408 if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1409 || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
f943b0fb 1410 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1411 "%d-bit long, but no consumerd for this long size is available.\n",
1412 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1413 ret = close(sock);
1414 if (ret) {
1415 PERROR("close");
1416 }
4063050c 1417 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1418 return -EINVAL;
1419 }
3f2c5fcc
MD
1420 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1421 ERR("Registration failed: application \"%s\" (pid: %d) has "
1422 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1423 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1424 ret = close(sock);
1425 if (ret) {
1426 PERROR("close");
1427 }
4063050c 1428 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1429 return -EINVAL;
1430 }
5b4a0ec0
DG
1431 lta = zmalloc(sizeof(struct ust_app));
1432 if (lta == NULL) {
1433 PERROR("malloc");
1434 return -ENOMEM;
1435 }
1436
1437 lta->ppid = msg->ppid;
1438 lta->uid = msg->uid;
1439 lta->gid = msg->gid;
e0c7ec2b 1440 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1441 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1442 lta->v_major = msg->major;
1443 lta->v_minor = msg->minor;
1444 strncpy(lta->name, msg->name, sizeof(lta->name));
1445 lta->name[16] = '\0';
bec39940 1446 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1447
852d0037
DG
1448 lta->pid = msg->pid;
1449 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1450 lta->sock = sock;
1451 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1452
1453 rcu_read_lock();
852d0037
DG
1454
1455 /*
1456 * On a re-registration, we want to kick out the previous registration of
1457 * that pid
1458 */
1459 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1460
1461 /*
1462 * The socket _should_ be unique until _we_ call close. So, a add_unique
1463 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1464 * already in the table.
1465 */
1466 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1467
5b4a0ec0
DG
1468 rcu_read_unlock();
1469
1470 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1471 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1472 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1473
1474 return 0;
1475}
1476
1477/*
1478 * Unregister app by removing it from the global traceable app list and freeing
1479 * the data struct.
1480 *
1481 * The socket is already closed at this point so no close to sock.
1482 */
1483void ust_app_unregister(int sock)
1484{
1485 struct ust_app *lta;
bec39940
DG
1486 struct lttng_ht_node_ulong *node;
1487 struct lttng_ht_iter iter;
525b0740 1488 int ret;
5b4a0ec0
DG
1489
1490 rcu_read_lock();
886459c6 1491
5b4a0ec0 1492 /* Get the node reference for a call_rcu */
852d0037 1493 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1494 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1495 if (node == NULL) {
852d0037 1496 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1497 goto error;
1498 }
284d8f55 1499
852d0037
DG
1500 lta = caa_container_of(node, struct ust_app, sock_n);
1501
1502 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1503
886459c6 1504 /* Remove application from PID hash table */
852d0037
DG
1505 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1506 assert(!ret);
1507
1508 /* Assign second node for deletion */
1509 iter.iter.node = &lta->pid_n.node;
1510
bec39940 1511 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1512 assert(!ret);
852d0037
DG
1513
1514 /* Free memory */
1515 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1516
284d8f55 1517error:
5b4a0ec0
DG
1518 rcu_read_unlock();
1519 return;
284d8f55
DG
1520}
1521
1522/*
5b4a0ec0 1523 * Return traceable_app_count
284d8f55 1524 */
5b4a0ec0 1525unsigned long ust_app_list_count(void)
284d8f55 1526{
5b4a0ec0 1527 unsigned long count;
284d8f55 1528
5b4a0ec0 1529 rcu_read_lock();
bec39940 1530 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1531 rcu_read_unlock();
284d8f55 1532
5b4a0ec0 1533 return count;
284d8f55
DG
1534}
1535
5b4a0ec0
DG
1536/*
1537 * Fill events array with all events name of all registered apps.
1538 */
1539int ust_app_list_events(struct lttng_event **events)
421cb601 1540{
5b4a0ec0
DG
1541 int ret, handle;
1542 size_t nbmem, count = 0;
bec39940 1543 struct lttng_ht_iter iter;
5b4a0ec0
DG
1544 struct ust_app *app;
1545 struct lttng_event *tmp;
421cb601 1546
5b4a0ec0
DG
1547 nbmem = UST_APP_EVENT_LIST_SIZE;
1548 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1549 if (tmp == NULL) {
1550 PERROR("zmalloc ust app events");
1551 ret = -ENOMEM;
421cb601
DG
1552 goto error;
1553 }
1554
5b4a0ec0 1555 rcu_read_lock();
421cb601 1556
852d0037 1557 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1558 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1559
86acf0da
DG
1560 health_code_update(&health_thread_cmd);
1561
e0c7ec2b
DG
1562 if (!app->compatible) {
1563 /*
1564 * TODO: In time, we should notice the caller of this error by
1565 * telling him that this is a version error.
1566 */
1567 continue;
1568 }
852d0037 1569 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1570 if (handle < 0) {
1571 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1572 app->pid);
5b4a0ec0
DG
1573 continue;
1574 }
421cb601 1575
852d0037 1576 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1577 &uiter)) != -ENOENT) {
86acf0da 1578 health_code_update(&health_thread_cmd);
815564d8
MD
1579 if (count >= nbmem) {
1580 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1581 2 * nbmem);
1582 nbmem *= 2;
2f221590 1583 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1584 if (tmp == NULL) {
1585 PERROR("realloc ust app events");
1586 ret = -ENOMEM;
1587 goto rcu_error;
1588 }
1589 }
90eaa0d2 1590 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1591 tmp[count].loglevel = uiter.loglevel;
6775595e 1592 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1593 tmp[count].pid = app->pid;
5b4a0ec0
DG
1594 tmp[count].enabled = -1;
1595 count++;
421cb601 1596 }
421cb601
DG
1597 }
1598
5b4a0ec0
DG
1599 ret = count;
1600 *events = tmp;
421cb601 1601
5b4a0ec0 1602 DBG2("UST app list events done (%zu events)", count);
421cb601 1603
5b4a0ec0
DG
1604rcu_error:
1605 rcu_read_unlock();
421cb601 1606error:
86acf0da 1607 health_code_update(&health_thread_cmd);
5b4a0ec0 1608 return ret;
421cb601
DG
1609}
1610
f37d259d
MD
1611/*
1612 * Fill events array with all events name of all registered apps.
1613 */
1614int ust_app_list_event_fields(struct lttng_event_field **fields)
1615{
1616 int ret, handle;
1617 size_t nbmem, count = 0;
1618 struct lttng_ht_iter iter;
1619 struct ust_app *app;
1620 struct lttng_event_field *tmp;
1621
1622 nbmem = UST_APP_EVENT_LIST_SIZE;
1623 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1624 if (tmp == NULL) {
1625 PERROR("zmalloc ust app event fields");
1626 ret = -ENOMEM;
1627 goto error;
1628 }
1629
1630 rcu_read_lock();
1631
1632 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1633 struct lttng_ust_field_iter uiter;
1634
86acf0da
DG
1635 health_code_update(&health_thread_cmd);
1636
f37d259d
MD
1637 if (!app->compatible) {
1638 /*
1639 * TODO: In time, we should notice the caller of this error by
1640 * telling him that this is a version error.
1641 */
1642 continue;
1643 }
1644 handle = ustctl_tracepoint_field_list(app->sock);
1645 if (handle < 0) {
1646 ERR("UST app list event fields getting handle failed for app pid %d",
1647 app->pid);
1648 continue;
1649 }
1650
1651 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1652 &uiter)) != -ENOENT) {
86acf0da 1653 health_code_update(&health_thread_cmd);
f37d259d
MD
1654 if (count >= nbmem) {
1655 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1656 2 * nbmem);
1657 nbmem *= 2;
1658 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1659 if (tmp == NULL) {
1660 PERROR("realloc ust app event fields");
1661 ret = -ENOMEM;
1662 goto rcu_error;
1663 }
1664 }
f37d259d
MD
1665
1666 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1667 tmp[count].type = uiter.type;
1668
1669 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1670 tmp[count].event.loglevel = uiter.loglevel;
1671 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1672 tmp[count].event.pid = app->pid;
1673 tmp[count].event.enabled = -1;
1674 count++;
1675 }
1676 }
1677
1678 ret = count;
1679 *fields = tmp;
1680
1681 DBG2("UST app list event fields done (%zu events)", count);
1682
1683rcu_error:
1684 rcu_read_unlock();
1685error:
86acf0da 1686 health_code_update(&health_thread_cmd);
f37d259d
MD
1687 return ret;
1688}
1689
5b4a0ec0
DG
1690/*
1691 * Free and clean all traceable apps of the global list.
1692 */
1693void ust_app_clean_list(void)
421cb601 1694{
5b4a0ec0 1695 int ret;
bec39940
DG
1696 struct lttng_ht_iter iter;
1697 struct lttng_ht_node_ulong *node;
421cb601 1698
5b4a0ec0 1699 DBG2("UST app cleaning registered apps hash table");
421cb601 1700
5b4a0ec0 1701 rcu_read_lock();
421cb601 1702
bec39940
DG
1703 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1704 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1705 assert(!ret);
bec39940 1706 call_rcu(&node->head, delete_ust_app_rcu);
421cb601
DG
1707 }
1708
852d0037
DG
1709 /* Cleanup socket hash table */
1710 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1711 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1712 assert(!ret);
1713 }
852d0037 1714
bec39940 1715 /* Destroy is done only when the ht is empty */
852d0037
DG
1716 lttng_ht_destroy(ust_app_ht);
1717 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1718
5b4a0ec0
DG
1719 rcu_read_unlock();
1720}
1721
1722/*
1723 * Init UST app hash table.
1724 */
1725void ust_app_ht_alloc(void)
1726{
bec39940 1727 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1728 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1729}
1730
78f0bacd
DG
1731/*
1732 * For a specific UST session, disable the channel for all registered apps.
1733 */
35a9059d 1734int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1735 struct ltt_ust_channel *uchan)
1736{
1737 int ret = 0;
bec39940
DG
1738 struct lttng_ht_iter iter;
1739 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1740 struct ust_app *app;
1741 struct ust_app_session *ua_sess;
8535a6d9 1742 struct ust_app_channel *ua_chan;
78f0bacd
DG
1743
1744 if (usess == NULL || uchan == NULL) {
1745 ERR("Disabling UST global channel with NULL values");
1746 ret = -1;
1747 goto error;
1748 }
1749
a991f516
MD
1750 DBG2("UST app disabling channel %s from global domain for session id %d",
1751 uchan->name, usess->id);
78f0bacd
DG
1752
1753 rcu_read_lock();
1754
1755 /* For every registered applications */
852d0037 1756 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1757 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1758 if (!app->compatible) {
1759 /*
1760 * TODO: In time, we should notice the caller of this error by
1761 * telling him that this is a version error.
1762 */
1763 continue;
1764 }
78f0bacd
DG
1765 ua_sess = lookup_session_by_app(usess, app);
1766 if (ua_sess == NULL) {
1767 continue;
1768 }
1769
8535a6d9 1770 /* Get channel */
bec39940
DG
1771 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1772 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1773 /* If the session if found for the app, the channel must be there */
1774 assert(ua_chan_node);
1775
1776 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1777 /* The channel must not be already disabled */
1778 assert(ua_chan->enabled == 1);
1779
1780 /* Disable channel onto application */
1781 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1782 if (ret < 0) {
1783 /* XXX: We might want to report this error at some point... */
1784 continue;
1785 }
1786 }
1787
1788 rcu_read_unlock();
1789
1790error:
1791 return ret;
1792}
1793
1794/*
1795 * For a specific UST session, enable the channel for all registered apps.
1796 */
35a9059d 1797int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1798 struct ltt_ust_channel *uchan)
1799{
1800 int ret = 0;
bec39940 1801 struct lttng_ht_iter iter;
78f0bacd
DG
1802 struct ust_app *app;
1803 struct ust_app_session *ua_sess;
1804
1805 if (usess == NULL || uchan == NULL) {
1806 ERR("Adding UST global channel to NULL values");
1807 ret = -1;
1808 goto error;
1809 }
1810
a991f516
MD
1811 DBG2("UST app enabling channel %s to global domain for session id %d",
1812 uchan->name, usess->id);
78f0bacd
DG
1813
1814 rcu_read_lock();
1815
1816 /* For every registered applications */
852d0037 1817 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1818 if (!app->compatible) {
1819 /*
1820 * TODO: In time, we should notice the caller of this error by
1821 * telling him that this is a version error.
1822 */
1823 continue;
1824 }
78f0bacd
DG
1825 ua_sess = lookup_session_by_app(usess, app);
1826 if (ua_sess == NULL) {
1827 continue;
1828 }
1829
1830 /* Enable channel onto application */
1831 ret = enable_ust_app_channel(ua_sess, uchan, app);
1832 if (ret < 0) {
1833 /* XXX: We might want to report this error at some point... */
1834 continue;
1835 }
1836 }
1837
1838 rcu_read_unlock();
1839
1840error:
1841 return ret;
1842}
1843
b0a40d28
DG
1844/*
1845 * Disable an event in a channel and for a specific session.
1846 */
35a9059d
DG
1847int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1848 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1849{
1850 int ret = 0;
bec39940
DG
1851 struct lttng_ht_iter iter, uiter;
1852 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1853 struct ust_app *app;
1854 struct ust_app_session *ua_sess;
1855 struct ust_app_channel *ua_chan;
1856 struct ust_app_event *ua_event;
1857
1858 DBG("UST app disabling event %s for all apps in channel "
a991f516 1859 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1860
1861 rcu_read_lock();
1862
1863 /* For all registered applications */
852d0037 1864 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1865 if (!app->compatible) {
1866 /*
1867 * TODO: In time, we should notice the caller of this error by
1868 * telling him that this is a version error.
1869 */
1870 continue;
1871 }
b0a40d28
DG
1872 ua_sess = lookup_session_by_app(usess, app);
1873 if (ua_sess == NULL) {
1874 /* Next app */
1875 continue;
1876 }
1877
1878 /* Lookup channel in the ust app session */
bec39940
DG
1879 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1880 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1881 if (ua_chan_node == NULL) {
a991f516 1882 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1883 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1884 continue;
1885 }
1886 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1887
bec39940
DG
1888 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1889 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1890 if (ua_event_node == NULL) {
1891 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1892 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1893 continue;
1894 }
1895 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1896
7f79d3a1 1897 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1898 if (ret < 0) {
1899 /* XXX: Report error someday... */
1900 continue;
1901 }
1902 }
1903
1904 rcu_read_unlock();
1905
1906 return ret;
1907}
1908
9730260e 1909/*
edb67388 1910 * For a specific UST session and UST channel, the event for all
9730260e
DG
1911 * registered apps.
1912 */
35a9059d 1913int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1914 struct ltt_ust_channel *uchan)
1915{
1916 int ret = 0;
bec39940
DG
1917 struct lttng_ht_iter iter, uiter;
1918 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1919 struct ust_app *app;
1920 struct ust_app_session *ua_sess;
1921 struct ust_app_channel *ua_chan;
1922 struct ust_app_event *ua_event;
1923
1924 DBG("UST app disabling all event for all apps in channel "
a991f516 1925 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1926
1927 rcu_read_lock();
1928
1929 /* For all registered applications */
852d0037 1930 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1931 if (!app->compatible) {
1932 /*
1933 * TODO: In time, we should notice the caller of this error by
1934 * telling him that this is a version error.
1935 */
1936 continue;
1937 }
9730260e 1938 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1939 /* If ua_sess is NULL, there is a code flow error */
1940 assert(ua_sess);
9730260e
DG
1941
1942 /* Lookup channel in the ust app session */
bec39940
DG
1943 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1944 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1945 /* If the channel is not found, there is a code flow error */
1946 assert(ua_chan_node);
1947
9730260e
DG
1948 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1949
1950 /* Disable each events of channel */
bec39940
DG
1951 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1952 node.node) {
7f79d3a1 1953 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1954 if (ret < 0) {
1955 /* XXX: Report error someday... */
1956 continue;
1957 }
1958 }
1959 }
1960
1961 rcu_read_unlock();
1962
1963 return ret;
1964}
1965
421cb601 1966/*
5b4a0ec0 1967 * For a specific UST session, create the channel for all registered apps.
421cb601 1968 */
35a9059d 1969int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1970 struct ltt_ust_channel *uchan)
1971{
bec39940 1972 struct lttng_ht_iter iter;
48842b30
DG
1973 struct ust_app *app;
1974 struct ust_app_session *ua_sess;
1975 struct ust_app_channel *ua_chan;
1976
fc34caaa
DG
1977 /* Very wrong code flow */
1978 assert(usess);
1979 assert(uchan);
421cb601 1980
a991f516
MD
1981 DBG2("UST app adding channel %s to global domain for session id %d",
1982 uchan->name, usess->id);
48842b30
DG
1983
1984 rcu_read_lock();
421cb601 1985
5b4a0ec0 1986 /* For every registered applications */
852d0037 1987 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1988 if (!app->compatible) {
1989 /*
1990 * TODO: In time, we should notice the caller of this error by
1991 * telling him that this is a version error.
1992 */
1993 continue;
1994 }
edb67388
DG
1995 /*
1996 * Create session on the tracer side and add it to app session HT. Note
1997 * that if session exist, it will simply return a pointer to the ust
1998 * app session.
1999 */
421cb601 2000 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2001 if (ua_sess == NULL) {
915d047c 2002 /* The malloc() failed. */
fc34caaa 2003 goto error;
915d047c
DG
2004 } else if (ua_sess == (void *) -1UL) {
2005 /* The application's socket is not valid. Contiuing */
2006 continue;
48842b30
DG
2007 }
2008
421cb601
DG
2009 /* Create channel onto application */
2010 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2011 if (ua_chan == NULL) {
fc34caaa
DG
2012 /* Major problem here and it's maybe the tracer or malloc() */
2013 goto error;
48842b30 2014 }
48842b30 2015 }
5b4a0ec0 2016
48842b30
DG
2017 rcu_read_unlock();
2018
fc34caaa
DG
2019 return 0;
2020
421cb601 2021error:
fc34caaa 2022 return -1;
48842b30
DG
2023}
2024
5b4a0ec0 2025/*
edb67388 2026 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2027 */
35a9059d 2028int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2029 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2030{
2031 int ret = 0;
bec39940
DG
2032 struct lttng_ht_iter iter, uiter;
2033 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
2034 struct ust_app *app;
2035 struct ust_app_session *ua_sess;
2036 struct ust_app_channel *ua_chan;
2037 struct ust_app_event *ua_event;
48842b30 2038
a991f516
MD
2039 DBG("UST app enabling event %s for all apps for session id %d",
2040 uevent->attr.name, usess->id);
48842b30 2041
edb67388
DG
2042 /*
2043 * NOTE: At this point, this function is called only if the session and
2044 * channel passed are already created for all apps. and enabled on the
2045 * tracer also.
2046 */
2047
48842b30 2048 rcu_read_lock();
421cb601
DG
2049
2050 /* For all registered applications */
852d0037 2051 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2052 if (!app->compatible) {
2053 /*
2054 * TODO: In time, we should notice the caller of this error by
2055 * telling him that this is a version error.
2056 */
2057 continue;
2058 }
edb67388
DG
2059 ua_sess = lookup_session_by_app(usess, app);
2060 /* If ua_sess is NULL, there is a code flow error */
2061 assert(ua_sess);
ba767faf 2062
edb67388 2063 /* Lookup channel in the ust app session */
bec39940
DG
2064 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2065 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2066 /* If the channel is not found, there is a code flow error */
2067 assert(ua_chan_node);
2068
2069 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2070
bec39940
DG
2071 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2072 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 2073 if (ua_event_node == NULL) {
7f79d3a1 2074 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2075 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2076 continue;
2077 }
2078 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2079
2080 ret = enable_ust_app_event(ua_sess, ua_event, app);
2081 if (ret < 0) {
7f79d3a1 2082 goto error;
48842b30 2083 }
edb67388
DG
2084 }
2085
7f79d3a1 2086error:
edb67388 2087 rcu_read_unlock();
edb67388
DG
2088 return ret;
2089}
2090
2091/*
2092 * For a specific existing UST session and UST channel, creates the event for
2093 * all registered apps.
2094 */
35a9059d 2095int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2096 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2097{
2098 int ret = 0;
bec39940
DG
2099 struct lttng_ht_iter iter, uiter;
2100 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2101 struct ust_app *app;
2102 struct ust_app_session *ua_sess;
2103 struct ust_app_channel *ua_chan;
2104
a991f516
MD
2105 DBG("UST app creating event %s for all apps for session id %d",
2106 uevent->attr.name, usess->id);
edb67388 2107
edb67388
DG
2108 rcu_read_lock();
2109
2110 /* For all registered applications */
852d0037 2111 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2112 if (!app->compatible) {
2113 /*
2114 * TODO: In time, we should notice the caller of this error by
2115 * telling him that this is a version error.
2116 */
2117 continue;
2118 }
edb67388
DG
2119 ua_sess = lookup_session_by_app(usess, app);
2120 /* If ua_sess is NULL, there is a code flow error */
2121 assert(ua_sess);
48842b30
DG
2122
2123 /* Lookup channel in the ust app session */
bec39940
DG
2124 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2125 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2126 /* If the channel is not found, there is a code flow error */
2127 assert(ua_chan_node);
2128
48842b30
DG
2129 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2130
edb67388
DG
2131 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2132 if (ret < 0) {
fc34caaa
DG
2133 if (ret != -EEXIST) {
2134 /* Possible value at this point: -ENOMEM. If so, we stop! */
2135 break;
2136 }
2137 DBG2("UST app event %s already exist on app PID %d",
852d0037 2138 uevent->attr.name, app->pid);
5b4a0ec0 2139 continue;
48842b30 2140 }
48842b30 2141 }
5b4a0ec0 2142
48842b30
DG
2143 rcu_read_unlock();
2144
2145 return ret;
2146}
2147
5b4a0ec0
DG
2148/*
2149 * Start tracing for a specific UST session and app.
2150 */
421cb601 2151int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2152{
2153 int ret = 0;
bec39940 2154 struct lttng_ht_iter iter;
48842b30
DG
2155 struct ust_app_session *ua_sess;
2156 struct ust_app_channel *ua_chan;
5b4a0ec0 2157 struct ltt_ust_stream *ustream;
7753dea8 2158 int consumerd_fd;
48842b30 2159
852d0037 2160 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2161
509cbaf8
MD
2162 rcu_read_lock();
2163
e0c7ec2b
DG
2164 if (!app->compatible) {
2165 goto end;
2166 }
2167
421cb601
DG
2168 ua_sess = lookup_session_by_app(usess, app);
2169 if (ua_sess == NULL) {
509cbaf8 2170 goto error_rcu_unlock;
421cb601 2171 }
48842b30 2172
aea829b3
DG
2173 /* Upon restart, we skip the setup, already done */
2174 if (ua_sess->started) {
8be98f9a 2175 goto skip_setup;
aea829b3 2176 }
8be98f9a 2177
f848c3eb
DG
2178 /* Indicate that the session has been started once */
2179 ua_sess->started = 1;
2180
421cb601
DG
2181 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2182 if (ret < 0) {
509cbaf8 2183 goto error_rcu_unlock;
421cb601 2184 }
48842b30 2185
421cb601 2186 /* For each channel */
bec39940
DG
2187 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2188 node.node) {
421cb601
DG
2189 /* Create all streams */
2190 while (1) {
5b4a0ec0 2191 /* Create UST stream */
421cb601
DG
2192 ustream = zmalloc(sizeof(*ustream));
2193 if (ustream == NULL) {
2194 PERROR("zmalloc ust stream");
509cbaf8 2195 goto error_rcu_unlock;
421cb601 2196 }
48842b30 2197
4063050c
MD
2198 /* We are going to receive 2 fds, we need to reserve them. */
2199 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2200 if (ret < 0) {
2201 ERR("Exhausted number of available FD upon stream create");
2202 free(ustream);
2203 goto error_rcu_unlock;
2204 }
86acf0da
DG
2205
2206 health_code_update(&health_thread_cmd);
2207
852d0037 2208 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2209 &ustream->obj);
48842b30 2210 if (ret < 0) {
421cb601 2211 /* Got all streams */
4063050c 2212 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2213 free(ustream);
421cb601 2214 break;
48842b30 2215 }
421cb601 2216 ustream->handle = ustream->obj->handle;
48842b30 2217
86acf0da
DG
2218 health_code_update(&health_thread_cmd);
2219
421cb601
DG
2220 /* Order is important */
2221 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675
DG
2222 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2223 ua_chan->name, ua_chan->streams.count++);
aba8e916
DG
2224 if (ret < 0) {
2225 PERROR("asprintf UST create stream");
a2c0da86
MD
2226 /*
2227 * XXX what should we do here with the
2228 * stream ?
2229 */
421cb601 2230 continue;
aba8e916 2231 }
00e2e675
DG
2232 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2233 ustream->handle);
421cb601 2234 }
86acf0da
DG
2235
2236 health_code_update(&health_thread_cmd);
421cb601 2237 }
aba8e916 2238
7753dea8
MD
2239 switch (app->bits_per_long) {
2240 case 64:
2241 consumerd_fd = ust_consumerd64_fd;
2242 break;
2243 case 32:
2244 consumerd_fd = ust_consumerd32_fd;
2245 break;
2246 default:
2247 ret = -EINVAL;
2248 goto error_rcu_unlock;
2249 }
aea829b3 2250
421cb601 2251 /* Setup UST consumer socket and send fds to it */
00e2e675 2252 ret = ust_consumer_send_session(consumerd_fd, ua_sess, usess->consumer);
421cb601 2253 if (ret < 0) {
509cbaf8 2254 goto error_rcu_unlock;
421cb601 2255 }
48842b30 2256
86acf0da
DG
2257 health_code_update(&health_thread_cmd);
2258
8be98f9a 2259skip_setup:
421cb601 2260 /* This start the UST tracing */
852d0037 2261 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2262 if (ret < 0) {
852d0037 2263 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2264 goto error_rcu_unlock;
421cb601 2265 }
5b4a0ec0 2266
86acf0da
DG
2267 health_code_update(&health_thread_cmd);
2268
421cb601 2269 /* Quiescent wait after starting trace */
852d0037 2270 ustctl_wait_quiescent(app->sock);
48842b30 2271
e0c7ec2b
DG
2272end:
2273 rcu_read_unlock();
86acf0da 2274 health_code_update(&health_thread_cmd);
421cb601 2275 return 0;
48842b30 2276
509cbaf8
MD
2277error_rcu_unlock:
2278 rcu_read_unlock();
86acf0da 2279 health_code_update(&health_thread_cmd);
421cb601
DG
2280 return -1;
2281}
48842b30 2282
8be98f9a
MD
2283/*
2284 * Stop tracing for a specific UST session and app.
2285 */
2286int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2287{
2288 int ret = 0;
bec39940 2289 struct lttng_ht_iter iter;
8be98f9a 2290 struct ust_app_session *ua_sess;
6d3686da 2291 struct ust_app_channel *ua_chan;
8be98f9a 2292
852d0037 2293 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2294
2295 rcu_read_lock();
2296
e0c7ec2b
DG
2297 if (!app->compatible) {
2298 goto end;
2299 }
2300
8be98f9a
MD
2301 ua_sess = lookup_session_by_app(usess, app);
2302 if (ua_sess == NULL) {
2303 /* Only malloc can failed so something is really wrong */
2304 goto error_rcu_unlock;
2305 }
2306
9bc07046
DG
2307 /*
2308 * If started = 0, it means that stop trace has been called for a session
2309 * that was never started. This is a code flow error and should never
2310 * happen.
2311 */
2312 assert(ua_sess->started == 1);
7db205b5 2313
86acf0da
DG
2314 health_code_update(&health_thread_cmd);
2315
9d6c7d3f 2316 /* This inhibits UST tracing */
852d0037 2317 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2318 if (ret < 0) {
852d0037 2319 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2320 goto error_rcu_unlock;
2321 }
2322
86acf0da
DG
2323 health_code_update(&health_thread_cmd);
2324
9d6c7d3f 2325 /* Quiescent wait after stopping trace */
852d0037 2326 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2327
86acf0da
DG
2328 health_code_update(&health_thread_cmd);
2329
9d6c7d3f 2330 /* Flushing buffers */
bec39940
DG
2331 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2332 node.node) {
86acf0da 2333 health_code_update(&health_thread_cmd);
852d0037 2334 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2335 if (ret < 0) {
7db205b5 2336 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2337 app->pid, ua_chan->name, ret);
6d3686da
DG
2338 /* Continuing flushing all buffers */
2339 continue;
8be98f9a
MD
2340 }
2341 }
8be98f9a 2342
86acf0da
DG
2343 health_code_update(&health_thread_cmd);
2344
90d97d10 2345 /* Flush all buffers before stopping */
852d0037 2346 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2347 if (ret < 0) {
852d0037 2348 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2349 ret);
90d97d10
DG
2350 }
2351
7db205b5
DG
2352end:
2353 rcu_read_unlock();
86acf0da 2354 health_code_update(&health_thread_cmd);
8be98f9a
MD
2355 return 0;
2356
2357error_rcu_unlock:
2358 rcu_read_unlock();
86acf0da 2359 health_code_update(&health_thread_cmd);
8be98f9a
MD
2360 return -1;
2361}
2362
84cd17c6
MD
2363/*
2364 * Destroy a specific UST session in apps.
2365 */
2366int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2367{
2368 struct ust_app_session *ua_sess;
2369 struct lttng_ust_object_data obj;
bec39940
DG
2370 struct lttng_ht_iter iter;
2371 struct lttng_ht_node_ulong *node;
525b0740 2372 int ret;
84cd17c6 2373
852d0037 2374 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2375
2376 rcu_read_lock();
2377
e0c7ec2b
DG
2378 if (!app->compatible) {
2379 goto end;
2380 }
2381
84cd17c6 2382 __lookup_session_by_app(usess, app, &iter);
bec39940 2383 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2384 if (node == NULL) {
2385 /* Only malloc can failed so something is really wrong */
2386 goto error_rcu_unlock;
2387 }
2388 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2389 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2390 assert(!ret);
84cd17c6
MD
2391 obj.handle = ua_sess->handle;
2392 obj.shm_fd = -1;
2393 obj.wait_fd = -1;
2394 obj.memory_map_size = 0;
86acf0da 2395 health_code_update(&health_thread_cmd);
852d0037 2396 ustctl_release_object(app->sock, &obj);
84cd17c6 2397
86acf0da 2398 health_code_update(&health_thread_cmd);
852d0037 2399 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2400
84cd17c6 2401 /* Quiescent wait after stopping trace */
852d0037 2402 ustctl_wait_quiescent(app->sock);
84cd17c6 2403
e0c7ec2b
DG
2404end:
2405 rcu_read_unlock();
86acf0da 2406 health_code_update(&health_thread_cmd);
84cd17c6
MD
2407 return 0;
2408
2409error_rcu_unlock:
2410 rcu_read_unlock();
86acf0da 2411 health_code_update(&health_thread_cmd);
84cd17c6
MD
2412 return -1;
2413}
2414
5b4a0ec0
DG
2415/*
2416 * Start tracing for the UST session.
2417 */
421cb601
DG
2418int ust_app_start_trace_all(struct ltt_ust_session *usess)
2419{
2420 int ret = 0;
bec39940 2421 struct lttng_ht_iter iter;
421cb601 2422 struct ust_app *app;
48842b30 2423
421cb601
DG
2424 DBG("Starting all UST traces");
2425
2426 rcu_read_lock();
421cb601 2427
852d0037 2428 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2429 ret = ust_app_start_trace(usess, app);
48842b30 2430 if (ret < 0) {
5b4a0ec0
DG
2431 /* Continue to next apps even on error */
2432 continue;
48842b30 2433 }
48842b30 2434 }
5b4a0ec0 2435
48842b30
DG
2436 rcu_read_unlock();
2437
2438 return 0;
2439}
487cf67c 2440
8be98f9a
MD
2441/*
2442 * Start tracing for the UST session.
2443 */
2444int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2445{
2446 int ret = 0;
bec39940 2447 struct lttng_ht_iter iter;
8be98f9a
MD
2448 struct ust_app *app;
2449
2450 DBG("Stopping all UST traces");
2451
2452 rcu_read_lock();
2453
852d0037 2454 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2455 ret = ust_app_stop_trace(usess, app);
2456 if (ret < 0) {
2457 /* Continue to next apps even on error */
2458 continue;
2459 }
2460 }
2461
2462 rcu_read_unlock();
2463
2464 return 0;
2465}
2466
84cd17c6
MD
2467/*
2468 * Destroy app UST session.
2469 */
2470int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2471{
2472 int ret = 0;
bec39940 2473 struct lttng_ht_iter iter;
84cd17c6
MD
2474 struct ust_app *app;
2475
2476 DBG("Destroy all UST traces");
2477
2478 rcu_read_lock();
2479
852d0037 2480 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2481 ret = ust_app_destroy_trace(usess, app);
2482 if (ret < 0) {
2483 /* Continue to next apps even on error */
2484 continue;
2485 }
2486 }
2487
2488 rcu_read_unlock();
2489
2490 return 0;
2491}
2492
5b4a0ec0
DG
2493/*
2494 * Add channels/events from UST global domain to registered apps at sock.
2495 */
487cf67c
DG
2496void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2497{
55c54cce 2498 int ret = 0;
727d5404 2499 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2500 struct ust_app *app;
2501 struct ust_app_session *ua_sess;
2502 struct ust_app_channel *ua_chan;
2503 struct ust_app_event *ua_event;
727d5404 2504 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2505
2506 if (usess == NULL) {
5b4a0ec0 2507 ERR("No UST session on global update. Returning");
1f3580c7
DG
2508 goto error;
2509 }
2510
a991f516
MD
2511 DBG2("UST app global update for app sock %d for session id %d", sock,
2512 usess->id);
487cf67c 2513
284d8f55
DG
2514 rcu_read_lock();
2515
487cf67c
DG
2516 app = find_app_by_sock(sock);
2517 if (app == NULL) {
2518 ERR("Failed to update app sock %d", sock);
2519 goto error;
2520 }
2521
e0c7ec2b
DG
2522 if (!app->compatible) {
2523 goto error;
2524 }
2525
421cb601 2526 ua_sess = create_ust_app_session(usess, app);
487cf67c 2527 if (ua_sess == NULL) {
487cf67c
DG
2528 goto error;
2529 }
2530
284d8f55
DG
2531 /*
2532 * We can iterate safely here over all UST app session sicne the create ust
2533 * app session above made a shadow copy of the UST global domain from the
2534 * ltt ust session.
2535 */
bec39940
DG
2536 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2537 node.node) {
284d8f55
DG
2538 ret = create_ust_channel(app, ua_sess, ua_chan);
2539 if (ret < 0) {
2540 /* FIXME: Should we quit here or continue... */
2541 continue;
487cf67c
DG
2542 }
2543
727d5404
DG
2544 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2545 node.node) {
2546 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2547 if (ret < 0) {
2548 /* FIXME: Should we quit here or continue... */
2549 continue;
2550 }
2551 }
2552
2553
284d8f55 2554 /* For each events */
bec39940
DG
2555 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2556 node.node) {
284d8f55
DG
2557 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2558 if (ret < 0) {
2559 /* FIXME: Should we quit here or continue... */
2560 continue;
487cf67c 2561 }
727d5404
DG
2562
2563 /* Add context on events. */
2564 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2565 ua_ctx, node.node) {
2566 ret = create_ust_event_context(ua_event, ua_ctx, app);
2567 if (ret < 0) {
2568 /* FIXME: Should we quit here or continue... */
2569 continue;
2570 }
2571 }
53a80697
MD
2572 ret = set_ust_event_filter(ua_event, app);
2573 if (ret < 0) {
2574 /* FIXME: Should we quit here or continue... */
2575 continue;
2576 }
36dc12cc 2577 }
487cf67c
DG
2578 }
2579
36dc12cc 2580 if (usess->start_trace) {
421cb601 2581 ret = ust_app_start_trace(usess, app);
36dc12cc 2582 if (ret < 0) {
36dc12cc
DG
2583 goto error;
2584 }
2585
852d0037 2586 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2587 }
2588
487cf67c
DG
2589error:
2590 rcu_read_unlock();
2591 return;
2592}
55cc08a6
DG
2593
2594/*
2595 * Add context to a specific channel for global UST domain.
2596 */
2597int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2598 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2599{
2600 int ret = 0;
bec39940
DG
2601 struct lttng_ht_node_str *ua_chan_node;
2602 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2603 struct ust_app_channel *ua_chan = NULL;
2604 struct ust_app_session *ua_sess;
2605 struct ust_app *app;
2606
2607 rcu_read_lock();
2608
852d0037 2609 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2610 if (!app->compatible) {
2611 /*
2612 * TODO: In time, we should notice the caller of this error by
2613 * telling him that this is a version error.
2614 */
2615 continue;
2616 }
55cc08a6
DG
2617 ua_sess = lookup_session_by_app(usess, app);
2618 if (ua_sess == NULL) {
2619 continue;
2620 }
2621
2622 /* Lookup channel in the ust app session */
bec39940
DG
2623 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2624 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2625 if (ua_chan_node == NULL) {
2626 continue;
2627 }
2628 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2629 node);
2630
2631 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2632 if (ret < 0) {
2633 continue;
2634 }
2635 }
2636
55cc08a6
DG
2637 rcu_read_unlock();
2638 return ret;
2639}
2640
2641/*
2642 * Add context to a specific event in a channel for global UST domain.
2643 */
2644int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2645 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2646 struct ltt_ust_context *uctx)
2647{
2648 int ret = 0;
bec39940
DG
2649 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2650 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2651 struct ust_app_session *ua_sess;
2652 struct ust_app_event *ua_event;
2653 struct ust_app_channel *ua_chan = NULL;
2654 struct ust_app *app;
2655
2656 rcu_read_lock();
2657
852d0037 2658 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2659 if (!app->compatible) {
2660 /*
2661 * TODO: In time, we should notice the caller of this error by
2662 * telling him that this is a version error.
2663 */
2664 continue;
2665 }
55cc08a6
DG
2666 ua_sess = lookup_session_by_app(usess, app);
2667 if (ua_sess == NULL) {
2668 continue;
2669 }
2670
2671 /* Lookup channel in the ust app session */
bec39940
DG
2672 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2673 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2674 if (ua_chan_node == NULL) {
2675 continue;
2676 }
2677 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2678 node);
2679
bec39940
DG
2680 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2681 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2682 if (ua_event_node == NULL) {
2683 continue;
2684 }
2685 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2686 node);
2687
2688 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2689 if (ret < 0) {
2690 continue;
2691 }
2692 }
2693
55cc08a6
DG
2694 rcu_read_unlock();
2695 return ret;
2696}
76d45b40 2697
53a80697
MD
2698/*
2699 * Add context to a specific event in a channel for global UST domain.
2700 */
2701int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2702 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2703 struct lttng_filter_bytecode *bytecode)
2704{
2705 int ret = 0;
2706 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2707 struct lttng_ht_iter iter, uiter;
2708 struct ust_app_session *ua_sess;
2709 struct ust_app_event *ua_event;
2710 struct ust_app_channel *ua_chan = NULL;
2711 struct ust_app *app;
2712
2713 rcu_read_lock();
2714
2715 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2716 if (!app->compatible) {
2717 /*
2718 * TODO: In time, we should notice the caller of this error by
2719 * telling him that this is a version error.
2720 */
2721 continue;
2722 }
2723 ua_sess = lookup_session_by_app(usess, app);
2724 if (ua_sess == NULL) {
2725 continue;
2726 }
2727
2728 /* Lookup channel in the ust app session */
2729 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2730 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2731 if (ua_chan_node == NULL) {
2732 continue;
2733 }
2734 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2735 node);
2736
2737 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2738 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2739 if (ua_event_node == NULL) {
2740 continue;
2741 }
2742 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2743 node);
2744
2745 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2746 if (ret < 0) {
2747 continue;
2748 }
2749 }
2750
2751 rcu_read_unlock();
2752 return ret;
2753}
2754
76d45b40
DG
2755/*
2756 * Enable event for a channel from a UST session for a specific PID.
2757 */
2758int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2759 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2760{
2761 int ret = 0;
bec39940
DG
2762 struct lttng_ht_iter iter;
2763 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2764 struct ust_app *app;
2765 struct ust_app_session *ua_sess;
2766 struct ust_app_channel *ua_chan;
2767 struct ust_app_event *ua_event;
2768
2769 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2770
2771 rcu_read_lock();
2772
2773 app = ust_app_find_by_pid(pid);
2774 if (app == NULL) {
2775 ERR("UST app enable event per PID %d not found", pid);
2776 ret = -1;
2777 goto error;
2778 }
2779
e0c7ec2b
DG
2780 if (!app->compatible) {
2781 ret = 0;
2782 goto error;
2783 }
2784
76d45b40
DG
2785 ua_sess = lookup_session_by_app(usess, app);
2786 /* If ua_sess is NULL, there is a code flow error */
2787 assert(ua_sess);
2788
2789 /* Lookup channel in the ust app session */
bec39940
DG
2790 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2791 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2792 /* If the channel is not found, there is a code flow error */
2793 assert(ua_chan_node);
2794
2795 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2796
bec39940
DG
2797 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2798 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2799 if (ua_event_node == NULL) {
2800 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2801 if (ret < 0) {
2802 goto error;
2803 }
2804 } else {
2805 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2806
2807 ret = enable_ust_app_event(ua_sess, ua_event, app);
2808 if (ret < 0) {
2809 goto error;
2810 }
2811 }
2812
2813error:
2814 rcu_read_unlock();
2815 return ret;
2816}
7f79d3a1
DG
2817
2818/*
2819 * Disable event for a channel from a UST session for a specific PID.
2820 */
2821int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2822 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2823{
2824 int ret = 0;
bec39940
DG
2825 struct lttng_ht_iter iter;
2826 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2827 struct ust_app *app;
2828 struct ust_app_session *ua_sess;
2829 struct ust_app_channel *ua_chan;
2830 struct ust_app_event *ua_event;
2831
2832 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2833
2834 rcu_read_lock();
2835
2836 app = ust_app_find_by_pid(pid);
2837 if (app == NULL) {
2838 ERR("UST app disable event per PID %d not found", pid);
2839 ret = -1;
2840 goto error;
2841 }
2842
e0c7ec2b
DG
2843 if (!app->compatible) {
2844 ret = 0;
2845 goto error;
2846 }
2847
7f79d3a1
DG
2848 ua_sess = lookup_session_by_app(usess, app);
2849 /* If ua_sess is NULL, there is a code flow error */
2850 assert(ua_sess);
2851
2852 /* Lookup channel in the ust app session */
bec39940
DG
2853 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2854 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2855 if (ua_chan_node == NULL) {
2856 /* Channel does not exist, skip disabling */
2857 goto error;
2858 }
2859 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2860
bec39940
DG
2861 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2862 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2863 if (ua_event_node == NULL) {
2864 /* Event does not exist, skip disabling */
2865 goto error;
2866 }
2867 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2868
2869 ret = disable_ust_app_event(ua_sess, ua_event, app);
2870 if (ret < 0) {
2871 goto error;
2872 }
2873
2874error:
2875 rcu_read_unlock();
2876 return ret;
2877}
e0c7ec2b
DG
2878
2879/*
2880 * Validate version of UST apps and set the compatible bit.
2881 */
2882int ust_app_validate_version(int sock)
2883{
2884 int ret;
2885 struct ust_app *app;
2886
2887 rcu_read_lock();
2888
2889 app = find_app_by_sock(sock);
2890 assert(app);
2891
86acf0da
DG
2892 health_code_update(&health_thread_cmd);
2893
e0c7ec2b
DG
2894 ret = ustctl_tracer_version(sock, &app->version);
2895 if (ret < 0) {
2896 goto error;
2897 }
2898
2899 /* Validate version */
2900 if (app->version.major > UST_APP_MAJOR_VERSION) {
2901 goto error;
2902 }
2903
2904 DBG2("UST app PID %d is compatible with major version %d "
852d0037 2905 "(supporting <= %d)", app->pid, app->version.major,
e0c7ec2b
DG
2906 UST_APP_MAJOR_VERSION);
2907 app->compatible = 1;
2908 rcu_read_unlock();
86acf0da 2909 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2910 return 0;
2911
2912error:
2913 DBG2("UST app PID %d is not compatible with major version %d "
852d0037 2914 "(supporting <= %d)", app->pid, app->version.major,
e0c7ec2b
DG
2915 UST_APP_MAJOR_VERSION);
2916 app->compatible = 0;
2917 rcu_read_unlock();
86acf0da 2918 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2919 return -1;
2920}
4466912f
DG
2921
2922/*
2923 * Calibrate registered applications.
2924 */
2925int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2926{
2927 int ret = 0;
2928 struct lttng_ht_iter iter;
2929 struct ust_app *app;
2930
2931 rcu_read_lock();
2932
852d0037 2933 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2934 if (!app->compatible) {
2935 /*
2936 * TODO: In time, we should notice the caller of this error by
2937 * telling him that this is a version error.
2938 */
2939 continue;
2940 }
2941
86acf0da
DG
2942 health_code_update(&health_thread_cmd);
2943
852d0037 2944 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2945 if (ret < 0) {
2946 switch (ret) {
2947 case -ENOSYS:
2948 /* Means that it's not implemented on the tracer side. */
2949 ret = 0;
2950 break;
2951 default:
2952 /* TODO: Report error to user */
2953 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2954 app->pid, ret);
4466912f
DG
2955 break;
2956 }
2957 }
2958 }
2959
2960 DBG("UST app global domain calibration finished");
2961
2962 rcu_read_unlock();
2963
86acf0da
DG
2964 health_code_update(&health_thread_cmd);
2965
4466912f
DG
2966 return ret;
2967}
This page took 0.182591 seconds and 4 git commands to generate.