Fix: Add EPIPE error handling on buffer splice
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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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
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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 *
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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.
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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>
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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
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32#include "fd-limit.h"
33#include "health.h"
56fff090 34#include "ust-app.h"
48842b30 35#include "ust-consumer.h"
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36#include "ust-ctl.h"
37
55cc08a6
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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
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52/*
53 * Delete ust app event safely. RCU read lock must be held before calling
54 * this function.
55 */
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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;
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61 struct ust_app_ctx *ua_ctx;
62
fc34caaa 63 /* Destroy each context of event */
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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);
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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
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73 if (ua_event->obj != NULL) {
74 ustctl_release_object(sock, ua_event->obj);
75 free(ua_event->obj);
76 }
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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 */
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84static
85void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 86{
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87 if (stream->obj) {
88 ustctl_release_object(sock, stream->obj);
4063050c 89 lttng_fd_put(LTTNG_FD_APPS, 2);
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90 free(stream->obj);
91 }
84cd17c6 92 free(stream);
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93}
94
95/*
96 * Delete ust app channel safely. RCU read lock must be held before calling
97 * this function.
98 */
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99static
100void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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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;
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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);
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111 delete_ust_app_stream(sock, stream);
112 }
113
55cc08a6 114 /* Wipe context */
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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);
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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 */
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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);
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127 delete_ust_app_event(sock, ua_event);
128 }
bec39940 129 lttng_ht_destroy(ua_chan->events);
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130
131 if (ua_chan->obj != NULL) {
132 ustctl_release_object(sock, ua_chan->obj);
4063050c 133 lttng_fd_put(LTTNG_FD_APPS, 2);
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134 free(ua_chan->obj);
135 }
84cd17c6 136 free(ua_chan);
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137}
138
139/*
140 * Delete ust app session safely. RCU read lock must be held before calling
141 * this function.
142 */
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143static
144void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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145{
146 int ret;
bec39940 147 struct lttng_ht_iter iter;
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148 struct ust_app_channel *ua_chan;
149
150 if (ua_sess->metadata) {
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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);
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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);
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159 free(ua_sess->metadata->obj);
160 }
a2c0da86 161 trace_ust_destroy_metadata(ua_sess->metadata);
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162 }
163
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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);
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168 delete_ust_app_channel(sock, ua_chan);
169 }
bec39940 170 lttng_ht_destroy(ua_sess->channels);
d80a6244 171
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172 if (ua_sess->handle != -1) {
173 ustctl_release_handle(sock, ua_sess->handle);
174 }
8b366481 175 free(ua_sess);
d80a6244 176}
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177
178/*
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179 * Delete a traceable application structure from the global list. Never call
180 * this function outside of a call_rcu call.
91d76f53 181 */
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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
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192 sock = app->sock;
193 app->sock = -1;
d80a6244 194
8b366481 195 /* Wipe sessions */
bec39940
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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
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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
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227}
228
229/*
f6a9efaa 230 * URCU intermediate call to delete an UST app.
099e26bd 231 */
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232static
233void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 234{
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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
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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);
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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);
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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
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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
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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
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505 health_code_update(&health_thread_cmd);
506
852d0037 507 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
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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
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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);
0f83395d 979 delete_ust_app_session(-1, ua_sess);
915d047c
DG
980 /* This means that the tracer is gone... */
981 ua_sess = (void*) -1UL;
0f83395d 982 goto end;
421cb601
DG
983 }
984
421cb601
DG
985 ua_sess->handle = ret;
986
987 /* Add ust app session to app's HT */
2c348c10 988 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 989 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
990
991 DBG2("UST app session created successfully with handle %d", ret);
992 }
993
fc34caaa 994end:
86acf0da 995 health_code_update(&health_thread_cmd);
421cb601 996 return ua_sess;
421cb601
DG
997}
998
55cc08a6
DG
999/*
1000 * Create a context for the channel on the tracer.
1001 */
1002static
1003int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1004 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1005 struct ust_app *app)
1006{
1007 int ret = 0;
bec39940
DG
1008 struct lttng_ht_iter iter;
1009 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1010 struct ust_app_ctx *ua_ctx;
1011
1012 DBG2("UST app adding context to channel %s", ua_chan->name);
1013
bec39940
DG
1014 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1015 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1016 if (node != NULL) {
1017 ret = -EEXIST;
1018 goto error;
1019 }
1020
1021 ua_ctx = alloc_ust_app_ctx(uctx);
1022 if (ua_ctx == NULL) {
1023 /* malloc failed */
1024 ret = -1;
1025 goto error;
1026 }
1027
bec39940
DG
1028 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1029 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1030
1031 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1032 if (ret < 0) {
1033 goto error;
1034 }
1035
1036error:
1037 return ret;
1038}
1039
1040/*
1041 * Create an UST context and enable it for the event on the tracer.
1042 */
1043static
1044int create_ust_app_event_context(struct ust_app_session *ua_sess,
1045 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1046 struct ust_app *app)
1047{
1048 int ret = 0;
bec39940
DG
1049 struct lttng_ht_iter iter;
1050 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1051 struct ust_app_ctx *ua_ctx;
1052
1053 DBG2("UST app adding context to event %s", ua_event->name);
1054
bec39940
DG
1055 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1056 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1057 if (node != NULL) {
1058 ret = -EEXIST;
1059 goto error;
1060 }
1061
1062 ua_ctx = alloc_ust_app_ctx(uctx);
1063 if (ua_ctx == NULL) {
1064 /* malloc failed */
1065 ret = -1;
1066 goto error;
1067 }
1068
bec39940
DG
1069 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1070 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
1071
1072 ret = create_ust_event_context(ua_event, ua_ctx, app);
1073 if (ret < 0) {
1074 goto error;
1075 }
1076
1077error:
1078 return ret;
1079}
1080
53a80697
MD
1081/*
1082 * Set UST filter for the event on the tracer.
1083 */
1084static
1085int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1086 struct ust_app_event *ua_event,
1087 struct lttng_filter_bytecode *bytecode,
1088 struct ust_app *app)
1089{
1090 int ret = 0;
1091
1092 DBG2("UST app adding context to event %s", ua_event->name);
1093
1094 /* Copy filter bytecode */
1095 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1096 if (!ua_event->filter) {
1097 return -ENOMEM;
1098 }
1099 memcpy(ua_event->filter, bytecode,
1100 sizeof(*ua_event->filter) + bytecode->len);
1101 ret = set_ust_event_filter(ua_event, app);
1102 if (ret < 0) {
1103 goto error;
1104 }
1105
1106error:
1107 return ret;
1108}
1109
edb67388
DG
1110/*
1111 * Enable on the tracer side a ust app event for the session and channel.
1112 */
1113static
1114int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1115 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1116{
1117 int ret;
1118
1119 ret = enable_ust_event(app, ua_sess, ua_event);
1120 if (ret < 0) {
1121 goto error;
1122 }
1123
1124 ua_event->enabled = 1;
1125
1126error:
1127 return ret;
1128}
1129
9730260e
DG
1130/*
1131 * Disable on the tracer side a ust app event for the session and channel.
1132 */
1133static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1134 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1135{
1136 int ret;
1137
1138 ret = disable_ust_event(app, ua_sess, ua_event);
1139 if (ret < 0) {
1140 goto error;
1141 }
1142
1143 ua_event->enabled = 0;
1144
1145error:
1146 return ret;
1147}
1148
78f0bacd
DG
1149/*
1150 * Lookup ust app channel for session and disable it on the tracer side.
1151 */
8535a6d9
DG
1152static
1153int disable_ust_app_channel(struct ust_app_session *ua_sess,
1154 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1155{
8535a6d9 1156 int ret;
78f0bacd
DG
1157
1158 ret = disable_ust_channel(app, ua_sess, ua_chan);
1159 if (ret < 0) {
1160 goto error;
1161 }
1162
8535a6d9
DG
1163 ua_chan->enabled = 0;
1164
78f0bacd
DG
1165error:
1166 return ret;
1167}
1168
1169/*
1170 * Lookup ust app channel for session and enable it on the tracer side.
1171 */
1172static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1173 struct ltt_ust_channel *uchan, struct ust_app *app)
1174{
1175 int ret = 0;
bec39940
DG
1176 struct lttng_ht_iter iter;
1177 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1178 struct ust_app_channel *ua_chan;
1179
bec39940
DG
1180 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1181 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1182 if (ua_chan_node == NULL) {
a991f516
MD
1183 DBG2("Unable to find channel %s in ust session id %u",
1184 uchan->name, ua_sess->id);
78f0bacd
DG
1185 goto error;
1186 }
1187
1188 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1189
1190 ret = enable_ust_channel(app, ua_sess, ua_chan);
1191 if (ret < 0) {
1192 goto error;
1193 }
1194
1195error:
1196 return ret;
1197}
1198
284d8f55 1199/*
5b4a0ec0 1200 * Create UST app channel and create it on the tracer.
284d8f55 1201 */
5b4a0ec0
DG
1202static struct ust_app_channel *create_ust_app_channel(
1203 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1204 struct ust_app *app)
1205{
1206 int ret = 0;
bec39940
DG
1207 struct lttng_ht_iter iter;
1208 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1209 struct ust_app_channel *ua_chan;
1210
1211 /* Lookup channel in the ust app session */
bec39940
DG
1212 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1213 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1214 if (ua_chan_node != NULL) {
5b4a0ec0 1215 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1216 goto end;
5b4a0ec0
DG
1217 }
1218
fc34caaa
DG
1219 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1220 if (ua_chan == NULL) {
1221 /* Only malloc can fail here */
1222 goto error;
1223 }
1224 shadow_copy_channel(ua_chan, uchan);
1225
5b4a0ec0
DG
1226 ret = create_ust_channel(app, ua_sess, ua_chan);
1227 if (ret < 0) {
fc34caaa
DG
1228 /* Not found previously means that it does not exist on the tracer */
1229 assert(ret != -EEXIST);
5b4a0ec0
DG
1230 goto error;
1231 }
1232
58f3ca76
DG
1233 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1234
fc34caaa 1235 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1236 app->pid);
fc34caaa
DG
1237
1238end:
5b4a0ec0
DG
1239 return ua_chan;
1240
1241error:
fc34caaa 1242 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1243 return NULL;
1244}
1245
1246/*
1247 * Create UST app event and create it on the tracer side.
1248 */
edb67388
DG
1249static
1250int create_ust_app_event(struct ust_app_session *ua_sess,
1251 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1252 struct ust_app *app)
284d8f55 1253{
edb67388 1254 int ret = 0;
bec39940
DG
1255 struct lttng_ht_iter iter;
1256 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1257 struct ust_app_event *ua_event;
284d8f55 1258
5b4a0ec0 1259 /* Get event node */
bec39940
DG
1260 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1261 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1262 if (ua_event_node != NULL) {
fc34caaa 1263 ret = -EEXIST;
edb67388
DG
1264 goto end;
1265 }
5b4a0ec0 1266
edb67388
DG
1267 /* Does not exist so create one */
1268 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1269 if (ua_event == NULL) {
1270 /* Only malloc can failed so something is really wrong */
1271 ret = -ENOMEM;
fc34caaa 1272 goto end;
5b4a0ec0 1273 }
edb67388 1274 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1275
edb67388 1276 /* Create it on the tracer side */
5b4a0ec0 1277 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1278 if (ret < 0) {
fc34caaa
DG
1279 /* Not found previously means that it does not exist on the tracer */
1280 assert(ret != -EEXIST);
284d8f55
DG
1281 goto error;
1282 }
1283
bec39940 1284 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1285
fc34caaa 1286 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1287 app->pid);
7f79d3a1 1288
edb67388 1289end:
fc34caaa
DG
1290 return ret;
1291
5b4a0ec0 1292error:
fc34caaa
DG
1293 /* Valid. Calling here is already in a read side lock */
1294 delete_ust_app_event(-1, ua_event);
edb67388 1295 return ret;
5b4a0ec0
DG
1296}
1297
1298/*
1299 * Create UST metadata and open it on the tracer side.
1300 */
1301static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1302 char *pathname, struct ust_app *app)
1303{
1304 int ret = 0;
1305
1306 if (ua_sess->metadata == NULL) {
1307 /* Allocate UST metadata */
1308 ua_sess->metadata = trace_ust_create_metadata(pathname);
1309 if (ua_sess->metadata == NULL) {
fc34caaa 1310 /* malloc() failed */
5b4a0ec0
DG
1311 goto error;
1312 }
1313
1314 ret = open_ust_metadata(app, ua_sess);
1315 if (ret < 0) {
7db205b5
DG
1316 DBG3("Opening metadata failed. Cleaning up memory");
1317
fc34caaa
DG
1318 /* Cleanup failed metadata struct */
1319 free(ua_sess->metadata);
7db205b5
DG
1320 /*
1321 * This is very important because delete_ust_app_session check if
1322 * the pointer is null or not in order to delete the metadata.
1323 */
1324 ua_sess->metadata = NULL;
5b4a0ec0
DG
1325 goto error;
1326 }
1327
852d0037 1328 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1329 }
1330
1331 /* Open UST metadata stream */
1332 if (ua_sess->metadata->stream_obj == NULL) {
1333 ret = create_ust_stream(app, ua_sess);
1334 if (ret < 0) {
1335 goto error;
1336 }
1337
477d7741
MD
1338 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1339 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1340 if (ret < 0) {
1341 PERROR("asprintf UST create stream");
1342 goto error;
1343 }
1344
1345 DBG2("UST metadata stream object created for app pid %d",
852d0037 1346 app->pid);
5b4a0ec0
DG
1347 } else {
1348 ERR("Attempting to create stream without metadata opened");
1349 goto error;
1350 }
1351
1352 return 0;
1353
1354error:
1355 return -1;
1356}
1357
1358/*
1359 * Return pointer to traceable apps list.
1360 */
bec39940 1361struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1362{
1363 return ust_app_ht;
1364}
1365
1366/*
1367 * Return ust app pointer or NULL if not found.
1368 */
1369struct ust_app *ust_app_find_by_pid(pid_t pid)
1370{
bec39940
DG
1371 struct lttng_ht_node_ulong *node;
1372 struct lttng_ht_iter iter;
5b4a0ec0
DG
1373
1374 rcu_read_lock();
bec39940
DG
1375 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1376 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1377 if (node == NULL) {
1378 DBG2("UST app no found with pid %d", pid);
1379 goto error;
1380 }
1381 rcu_read_unlock();
1382
1383 DBG2("Found UST app by pid %d", pid);
1384
852d0037 1385 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1386
1387error:
1388 rcu_read_unlock();
1389 return NULL;
1390}
1391
1392/*
1393 * Using pid and uid (of the app), allocate a new ust_app struct and
1394 * add it to the global traceable app list.
1395 *
0df502fd
MD
1396 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1397 * bitness is not supported.
5b4a0ec0
DG
1398 */
1399int ust_app_register(struct ust_register_msg *msg, int sock)
1400{
1401 struct ust_app *lta;
799e2c4f 1402 int ret;
5b4a0ec0 1403
173af62f
DG
1404 if ((msg->bits_per_long == 64 &&
1405 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1406 || (msg->bits_per_long == 32 &&
1407 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1408 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1409 "%d-bit long, but no consumerd for this long size is available.\n",
1410 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1411 ret = close(sock);
1412 if (ret) {
1413 PERROR("close");
1414 }
4063050c 1415 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1416 return -EINVAL;
1417 }
3f2c5fcc
MD
1418 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1419 ERR("Registration failed: application \"%s\" (pid: %d) has "
1420 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1421 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1422 ret = close(sock);
1423 if (ret) {
1424 PERROR("close");
1425 }
4063050c 1426 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1427 return -EINVAL;
1428 }
5b4a0ec0
DG
1429 lta = zmalloc(sizeof(struct ust_app));
1430 if (lta == NULL) {
1431 PERROR("malloc");
1432 return -ENOMEM;
1433 }
1434
1435 lta->ppid = msg->ppid;
1436 lta->uid = msg->uid;
1437 lta->gid = msg->gid;
e0c7ec2b 1438 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1439 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1440 lta->v_major = msg->major;
1441 lta->v_minor = msg->minor;
1442 strncpy(lta->name, msg->name, sizeof(lta->name));
1443 lta->name[16] = '\0';
bec39940 1444 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1445
852d0037
DG
1446 lta->pid = msg->pid;
1447 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1448 lta->sock = sock;
1449 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1450
1451 rcu_read_lock();
852d0037
DG
1452
1453 /*
1454 * On a re-registration, we want to kick out the previous registration of
1455 * that pid
1456 */
1457 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1458
1459 /*
1460 * The socket _should_ be unique until _we_ call close. So, a add_unique
1461 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1462 * already in the table.
1463 */
1464 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1465
5b4a0ec0
DG
1466 rcu_read_unlock();
1467
1468 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1469 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1470 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1471
1472 return 0;
1473}
1474
1475/*
1476 * Unregister app by removing it from the global traceable app list and freeing
1477 * the data struct.
1478 *
1479 * The socket is already closed at this point so no close to sock.
1480 */
1481void ust_app_unregister(int sock)
1482{
1483 struct ust_app *lta;
bec39940
DG
1484 struct lttng_ht_node_ulong *node;
1485 struct lttng_ht_iter iter;
525b0740 1486 int ret;
5b4a0ec0
DG
1487
1488 rcu_read_lock();
886459c6 1489
5b4a0ec0 1490 /* Get the node reference for a call_rcu */
852d0037 1491 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1492 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1493 if (node == NULL) {
852d0037 1494 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1495 goto error;
1496 }
284d8f55 1497
852d0037
DG
1498 lta = caa_container_of(node, struct ust_app, sock_n);
1499
1500 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1501
886459c6 1502 /* Remove application from PID hash table */
852d0037
DG
1503 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1504 assert(!ret);
1505
1506 /* Assign second node for deletion */
1507 iter.iter.node = &lta->pid_n.node;
1508
5b98a774
DG
1509 /*
1510 * Ignore return value since the node might have been removed before by an
1511 * add replace during app registration because the PID can be reassigned by
1512 * the OS.
1513 */
bec39940 1514 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
1515 if (ret) {
1516 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1517 lta->pid);
1518 }
852d0037
DG
1519
1520 /* Free memory */
1521 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1522
284d8f55 1523error:
5b4a0ec0
DG
1524 rcu_read_unlock();
1525 return;
284d8f55
DG
1526}
1527
1528/*
5b4a0ec0 1529 * Return traceable_app_count
284d8f55 1530 */
5b4a0ec0 1531unsigned long ust_app_list_count(void)
284d8f55 1532{
5b4a0ec0 1533 unsigned long count;
284d8f55 1534
5b4a0ec0 1535 rcu_read_lock();
bec39940 1536 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1537 rcu_read_unlock();
284d8f55 1538
5b4a0ec0 1539 return count;
284d8f55
DG
1540}
1541
5b4a0ec0
DG
1542/*
1543 * Fill events array with all events name of all registered apps.
1544 */
1545int ust_app_list_events(struct lttng_event **events)
421cb601 1546{
5b4a0ec0
DG
1547 int ret, handle;
1548 size_t nbmem, count = 0;
bec39940 1549 struct lttng_ht_iter iter;
5b4a0ec0
DG
1550 struct ust_app *app;
1551 struct lttng_event *tmp;
421cb601 1552
5b4a0ec0
DG
1553 nbmem = UST_APP_EVENT_LIST_SIZE;
1554 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1555 if (tmp == NULL) {
1556 PERROR("zmalloc ust app events");
1557 ret = -ENOMEM;
421cb601
DG
1558 goto error;
1559 }
1560
5b4a0ec0 1561 rcu_read_lock();
421cb601 1562
852d0037 1563 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1564 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1565
86acf0da
DG
1566 health_code_update(&health_thread_cmd);
1567
e0c7ec2b
DG
1568 if (!app->compatible) {
1569 /*
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1572 */
1573 continue;
1574 }
852d0037 1575 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1576 if (handle < 0) {
1577 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1578 app->pid);
5b4a0ec0
DG
1579 continue;
1580 }
421cb601 1581
852d0037 1582 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1583 &uiter)) != -ENOENT) {
86acf0da 1584 health_code_update(&health_thread_cmd);
815564d8 1585 if (count >= nbmem) {
d7b3776f
DG
1586 /* In case the realloc fails, we free the memory */
1587 void *tmp_ptr = (void *) tmp;
815564d8
MD
1588 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1589 2 * nbmem);
1590 nbmem *= 2;
2f221590 1591 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1592 if (tmp == NULL) {
1593 PERROR("realloc ust app events");
d7b3776f 1594 free(tmp_ptr);
5b4a0ec0
DG
1595 ret = -ENOMEM;
1596 goto rcu_error;
1597 }
1598 }
90eaa0d2 1599 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1600 tmp[count].loglevel = uiter.loglevel;
6775595e 1601 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1602 tmp[count].pid = app->pid;
5b4a0ec0
DG
1603 tmp[count].enabled = -1;
1604 count++;
421cb601 1605 }
421cb601
DG
1606 }
1607
5b4a0ec0
DG
1608 ret = count;
1609 *events = tmp;
421cb601 1610
5b4a0ec0 1611 DBG2("UST app list events done (%zu events)", count);
421cb601 1612
5b4a0ec0
DG
1613rcu_error:
1614 rcu_read_unlock();
421cb601 1615error:
86acf0da 1616 health_code_update(&health_thread_cmd);
5b4a0ec0 1617 return ret;
421cb601
DG
1618}
1619
f37d259d
MD
1620/*
1621 * Fill events array with all events name of all registered apps.
1622 */
1623int ust_app_list_event_fields(struct lttng_event_field **fields)
1624{
1625 int ret, handle;
1626 size_t nbmem, count = 0;
1627 struct lttng_ht_iter iter;
1628 struct ust_app *app;
1629 struct lttng_event_field *tmp;
1630
1631 nbmem = UST_APP_EVENT_LIST_SIZE;
1632 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1633 if (tmp == NULL) {
1634 PERROR("zmalloc ust app event fields");
1635 ret = -ENOMEM;
1636 goto error;
1637 }
1638
1639 rcu_read_lock();
1640
1641 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1642 struct lttng_ust_field_iter uiter;
1643
86acf0da
DG
1644 health_code_update(&health_thread_cmd);
1645
f37d259d
MD
1646 if (!app->compatible) {
1647 /*
1648 * TODO: In time, we should notice the caller of this error by
1649 * telling him that this is a version error.
1650 */
1651 continue;
1652 }
1653 handle = ustctl_tracepoint_field_list(app->sock);
1654 if (handle < 0) {
1655 ERR("UST app list event fields getting handle failed for app pid %d",
1656 app->pid);
1657 continue;
1658 }
1659
1660 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1661 &uiter)) != -ENOENT) {
86acf0da 1662 health_code_update(&health_thread_cmd);
f37d259d 1663 if (count >= nbmem) {
d7b3776f
DG
1664 /* In case the realloc fails, we free the memory */
1665 void *tmp_ptr = (void *) tmp;
f37d259d
MD
1666 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1667 2 * nbmem);
1668 nbmem *= 2;
1669 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1670 if (tmp == NULL) {
1671 PERROR("realloc ust app event fields");
d7b3776f 1672 free(tmp_ptr);
f37d259d
MD
1673 ret = -ENOMEM;
1674 goto rcu_error;
1675 }
1676 }
f37d259d
MD
1677
1678 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1679 tmp[count].type = uiter.type;
590b9e3c 1680 tmp[count].nowrite = uiter.nowrite;
f37d259d
MD
1681
1682 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1683 tmp[count].event.loglevel = uiter.loglevel;
1684 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1685 tmp[count].event.pid = app->pid;
1686 tmp[count].event.enabled = -1;
1687 count++;
1688 }
1689 }
1690
1691 ret = count;
1692 *fields = tmp;
1693
1694 DBG2("UST app list event fields done (%zu events)", count);
1695
1696rcu_error:
1697 rcu_read_unlock();
1698error:
86acf0da 1699 health_code_update(&health_thread_cmd);
f37d259d
MD
1700 return ret;
1701}
1702
5b4a0ec0
DG
1703/*
1704 * Free and clean all traceable apps of the global list.
1705 */
1706void ust_app_clean_list(void)
421cb601 1707{
5b4a0ec0 1708 int ret;
659ed79f 1709 struct ust_app *app;
bec39940 1710 struct lttng_ht_iter iter;
421cb601 1711
5b4a0ec0 1712 DBG2("UST app cleaning registered apps hash table");
421cb601 1713
5b4a0ec0 1714 rcu_read_lock();
421cb601 1715
659ed79f 1716 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1717 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1718 assert(!ret);
659ed79f 1719 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1720 }
1721
852d0037 1722 /* Cleanup socket hash table */
659ed79f
DG
1723 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1724 sock_n.node) {
852d0037 1725 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1726 assert(!ret);
1727 }
852d0037 1728
bec39940 1729 /* Destroy is done only when the ht is empty */
852d0037
DG
1730 lttng_ht_destroy(ust_app_ht);
1731 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1732
5b4a0ec0
DG
1733 rcu_read_unlock();
1734}
1735
1736/*
1737 * Init UST app hash table.
1738 */
1739void ust_app_ht_alloc(void)
1740{
bec39940 1741 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1742 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1743}
1744
78f0bacd
DG
1745/*
1746 * For a specific UST session, disable the channel for all registered apps.
1747 */
35a9059d 1748int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1749 struct ltt_ust_channel *uchan)
1750{
1751 int ret = 0;
bec39940
DG
1752 struct lttng_ht_iter iter;
1753 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1754 struct ust_app *app;
1755 struct ust_app_session *ua_sess;
8535a6d9 1756 struct ust_app_channel *ua_chan;
78f0bacd
DG
1757
1758 if (usess == NULL || uchan == NULL) {
1759 ERR("Disabling UST global channel with NULL values");
1760 ret = -1;
1761 goto error;
1762 }
1763
a991f516
MD
1764 DBG2("UST app disabling channel %s from global domain for session id %d",
1765 uchan->name, usess->id);
78f0bacd
DG
1766
1767 rcu_read_lock();
1768
1769 /* For every registered applications */
852d0037 1770 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1771 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1772 if (!app->compatible) {
1773 /*
1774 * TODO: In time, we should notice the caller of this error by
1775 * telling him that this is a version error.
1776 */
1777 continue;
1778 }
78f0bacd
DG
1779 ua_sess = lookup_session_by_app(usess, app);
1780 if (ua_sess == NULL) {
1781 continue;
1782 }
1783
8535a6d9 1784 /* Get channel */
bec39940
DG
1785 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1786 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1787 /* If the session if found for the app, the channel must be there */
1788 assert(ua_chan_node);
1789
1790 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1791 /* The channel must not be already disabled */
1792 assert(ua_chan->enabled == 1);
1793
1794 /* Disable channel onto application */
1795 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1796 if (ret < 0) {
1797 /* XXX: We might want to report this error at some point... */
1798 continue;
1799 }
1800 }
1801
1802 rcu_read_unlock();
1803
1804error:
1805 return ret;
1806}
1807
1808/*
1809 * For a specific UST session, enable the channel for all registered apps.
1810 */
35a9059d 1811int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1812 struct ltt_ust_channel *uchan)
1813{
1814 int ret = 0;
bec39940 1815 struct lttng_ht_iter iter;
78f0bacd
DG
1816 struct ust_app *app;
1817 struct ust_app_session *ua_sess;
1818
1819 if (usess == NULL || uchan == NULL) {
1820 ERR("Adding UST global channel to NULL values");
1821 ret = -1;
1822 goto error;
1823 }
1824
a991f516
MD
1825 DBG2("UST app enabling channel %s to global domain for session id %d",
1826 uchan->name, usess->id);
78f0bacd
DG
1827
1828 rcu_read_lock();
1829
1830 /* For every registered applications */
852d0037 1831 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1832 if (!app->compatible) {
1833 /*
1834 * TODO: In time, we should notice the caller of this error by
1835 * telling him that this is a version error.
1836 */
1837 continue;
1838 }
78f0bacd
DG
1839 ua_sess = lookup_session_by_app(usess, app);
1840 if (ua_sess == NULL) {
1841 continue;
1842 }
1843
1844 /* Enable channel onto application */
1845 ret = enable_ust_app_channel(ua_sess, uchan, app);
1846 if (ret < 0) {
1847 /* XXX: We might want to report this error at some point... */
1848 continue;
1849 }
1850 }
1851
1852 rcu_read_unlock();
1853
1854error:
1855 return ret;
1856}
1857
b0a40d28
DG
1858/*
1859 * Disable an event in a channel and for a specific session.
1860 */
35a9059d
DG
1861int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1862 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1863{
1864 int ret = 0;
bec39940
DG
1865 struct lttng_ht_iter iter, uiter;
1866 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1867 struct ust_app *app;
1868 struct ust_app_session *ua_sess;
1869 struct ust_app_channel *ua_chan;
1870 struct ust_app_event *ua_event;
1871
1872 DBG("UST app disabling event %s for all apps in channel "
a991f516 1873 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1874
1875 rcu_read_lock();
1876
1877 /* For all registered applications */
852d0037 1878 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1879 if (!app->compatible) {
1880 /*
1881 * TODO: In time, we should notice the caller of this error by
1882 * telling him that this is a version error.
1883 */
1884 continue;
1885 }
b0a40d28
DG
1886 ua_sess = lookup_session_by_app(usess, app);
1887 if (ua_sess == NULL) {
1888 /* Next app */
1889 continue;
1890 }
1891
1892 /* Lookup channel in the ust app session */
bec39940
DG
1893 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1894 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1895 if (ua_chan_node == NULL) {
a991f516 1896 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1897 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1898 continue;
1899 }
1900 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1901
bec39940
DG
1902 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1903 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1904 if (ua_event_node == NULL) {
1905 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1906 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1907 continue;
1908 }
1909 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1910
7f79d3a1 1911 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1912 if (ret < 0) {
1913 /* XXX: Report error someday... */
1914 continue;
1915 }
1916 }
1917
1918 rcu_read_unlock();
1919
1920 return ret;
1921}
1922
9730260e 1923/*
edb67388 1924 * For a specific UST session and UST channel, the event for all
9730260e
DG
1925 * registered apps.
1926 */
35a9059d 1927int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1928 struct ltt_ust_channel *uchan)
1929{
1930 int ret = 0;
bec39940
DG
1931 struct lttng_ht_iter iter, uiter;
1932 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1933 struct ust_app *app;
1934 struct ust_app_session *ua_sess;
1935 struct ust_app_channel *ua_chan;
1936 struct ust_app_event *ua_event;
1937
1938 DBG("UST app disabling all event for all apps in channel "
a991f516 1939 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1940
1941 rcu_read_lock();
1942
1943 /* For all registered applications */
852d0037 1944 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1945 if (!app->compatible) {
1946 /*
1947 * TODO: In time, we should notice the caller of this error by
1948 * telling him that this is a version error.
1949 */
1950 continue;
1951 }
9730260e 1952 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1953 /* If ua_sess is NULL, there is a code flow error */
1954 assert(ua_sess);
9730260e
DG
1955
1956 /* Lookup channel in the ust app session */
bec39940
DG
1957 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1958 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1959 /* If the channel is not found, there is a code flow error */
1960 assert(ua_chan_node);
1961
9730260e
DG
1962 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1963
1964 /* Disable each events of channel */
bec39940
DG
1965 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1966 node.node) {
7f79d3a1 1967 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1968 if (ret < 0) {
1969 /* XXX: Report error someday... */
1970 continue;
1971 }
1972 }
1973 }
1974
1975 rcu_read_unlock();
1976
1977 return ret;
1978}
1979
421cb601 1980/*
5b4a0ec0 1981 * For a specific UST session, create the channel for all registered apps.
421cb601 1982 */
35a9059d 1983int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1984 struct ltt_ust_channel *uchan)
1985{
3c14c33f 1986 int ret = 0;
bec39940 1987 struct lttng_ht_iter iter;
48842b30
DG
1988 struct ust_app *app;
1989 struct ust_app_session *ua_sess;
1990 struct ust_app_channel *ua_chan;
1991
fc34caaa
DG
1992 /* Very wrong code flow */
1993 assert(usess);
1994 assert(uchan);
421cb601 1995
a991f516
MD
1996 DBG2("UST app adding channel %s to global domain for session id %d",
1997 uchan->name, usess->id);
48842b30
DG
1998
1999 rcu_read_lock();
421cb601 2000
5b4a0ec0 2001 /* For every registered applications */
852d0037 2002 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2003 if (!app->compatible) {
2004 /*
2005 * TODO: In time, we should notice the caller of this error by
2006 * telling him that this is a version error.
2007 */
2008 continue;
2009 }
edb67388
DG
2010 /*
2011 * Create session on the tracer side and add it to app session HT. Note
2012 * that if session exist, it will simply return a pointer to the ust
2013 * app session.
2014 */
421cb601 2015 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2016 if (ua_sess == NULL) {
915d047c 2017 /* The malloc() failed. */
3c14c33f 2018 ret = -1;
fc34caaa 2019 goto error;
915d047c
DG
2020 } else if (ua_sess == (void *) -1UL) {
2021 /* The application's socket is not valid. Contiuing */
3c14c33f 2022 ret = -1;
915d047c 2023 continue;
48842b30
DG
2024 }
2025
421cb601
DG
2026 /* Create channel onto application */
2027 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2028 if (ua_chan == NULL) {
fc34caaa 2029 /* Major problem here and it's maybe the tracer or malloc() */
3c14c33f 2030 ret = -1;
fc34caaa 2031 goto error;
48842b30 2032 }
48842b30 2033 }
5b4a0ec0 2034
48842b30
DG
2035 rcu_read_unlock();
2036
421cb601 2037error:
3c14c33f 2038 return ret;
48842b30
DG
2039}
2040
5b4a0ec0 2041/*
edb67388 2042 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2043 */
35a9059d 2044int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2045 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2046{
2047 int ret = 0;
bec39940
DG
2048 struct lttng_ht_iter iter, uiter;
2049 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
2050 struct ust_app *app;
2051 struct ust_app_session *ua_sess;
2052 struct ust_app_channel *ua_chan;
2053 struct ust_app_event *ua_event;
48842b30 2054
a991f516
MD
2055 DBG("UST app enabling event %s for all apps for session id %d",
2056 uevent->attr.name, usess->id);
48842b30 2057
edb67388
DG
2058 /*
2059 * NOTE: At this point, this function is called only if the session and
2060 * channel passed are already created for all apps. and enabled on the
2061 * tracer also.
2062 */
2063
48842b30 2064 rcu_read_lock();
421cb601
DG
2065
2066 /* For all registered applications */
852d0037 2067 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2068 if (!app->compatible) {
2069 /*
2070 * TODO: In time, we should notice the caller of this error by
2071 * telling him that this is a version error.
2072 */
2073 continue;
2074 }
edb67388
DG
2075 ua_sess = lookup_session_by_app(usess, app);
2076 /* If ua_sess is NULL, there is a code flow error */
2077 assert(ua_sess);
ba767faf 2078
edb67388 2079 /* Lookup channel in the ust app session */
bec39940
DG
2080 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2081 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2082 /* If the channel is not found, there is a code flow error */
2083 assert(ua_chan_node);
2084
2085 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2086
bec39940
DG
2087 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2088 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 2089 if (ua_event_node == NULL) {
7f79d3a1 2090 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2091 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2092 continue;
2093 }
2094 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2095
2096 ret = enable_ust_app_event(ua_sess, ua_event, app);
2097 if (ret < 0) {
7f79d3a1 2098 goto error;
48842b30 2099 }
edb67388
DG
2100 }
2101
7f79d3a1 2102error:
edb67388 2103 rcu_read_unlock();
edb67388
DG
2104 return ret;
2105}
2106
2107/*
2108 * For a specific existing UST session and UST channel, creates the event for
2109 * all registered apps.
2110 */
35a9059d 2111int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2112 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2113{
2114 int ret = 0;
bec39940
DG
2115 struct lttng_ht_iter iter, uiter;
2116 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2117 struct ust_app *app;
2118 struct ust_app_session *ua_sess;
2119 struct ust_app_channel *ua_chan;
2120
a991f516
MD
2121 DBG("UST app creating event %s for all apps for session id %d",
2122 uevent->attr.name, usess->id);
edb67388 2123
edb67388
DG
2124 rcu_read_lock();
2125
2126 /* For all registered applications */
852d0037 2127 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2128 if (!app->compatible) {
2129 /*
2130 * TODO: In time, we should notice the caller of this error by
2131 * telling him that this is a version error.
2132 */
2133 continue;
2134 }
edb67388
DG
2135 ua_sess = lookup_session_by_app(usess, app);
2136 /* If ua_sess is NULL, there is a code flow error */
2137 assert(ua_sess);
48842b30
DG
2138
2139 /* Lookup channel in the ust app session */
bec39940
DG
2140 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2141 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2142 /* If the channel is not found, there is a code flow error */
2143 assert(ua_chan_node);
2144
48842b30
DG
2145 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2146
edb67388
DG
2147 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2148 if (ret < 0) {
fc34caaa
DG
2149 if (ret != -EEXIST) {
2150 /* Possible value at this point: -ENOMEM. If so, we stop! */
2151 break;
2152 }
2153 DBG2("UST app event %s already exist on app PID %d",
852d0037 2154 uevent->attr.name, app->pid);
5b4a0ec0 2155 continue;
48842b30 2156 }
48842b30 2157 }
5b4a0ec0 2158
48842b30
DG
2159 rcu_read_unlock();
2160
2161 return ret;
2162}
2163
5b4a0ec0
DG
2164/*
2165 * Start tracing for a specific UST session and app.
2166 */
421cb601 2167int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2168{
2169 int ret = 0;
bec39940 2170 struct lttng_ht_iter iter;
48842b30
DG
2171 struct ust_app_session *ua_sess;
2172 struct ust_app_channel *ua_chan;
5b4a0ec0 2173 struct ltt_ust_stream *ustream;
173af62f 2174 struct consumer_socket *socket;
48842b30 2175
852d0037 2176 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2177
509cbaf8
MD
2178 rcu_read_lock();
2179
e0c7ec2b
DG
2180 if (!app->compatible) {
2181 goto end;
2182 }
2183
421cb601
DG
2184 ua_sess = lookup_session_by_app(usess, app);
2185 if (ua_sess == NULL) {
509cbaf8 2186 goto error_rcu_unlock;
421cb601 2187 }
48842b30 2188
aea829b3
DG
2189 /* Upon restart, we skip the setup, already done */
2190 if (ua_sess->started) {
8be98f9a 2191 goto skip_setup;
aea829b3 2192 }
8be98f9a 2193
a4b92340
DG
2194 /* Create directories if consumer is LOCAL and has a path defined. */
2195 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2196 strlen(usess->consumer->dst.trace_path) > 0) {
2197 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2198 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2199 if (ret < 0) {
2200 if (ret != -EEXIST) {
2201 ERR("Trace directory creation error");
2202 ret = -1;
2203 goto error_rcu_unlock;
2204 }
2205 }
2206 }
2207
f848c3eb
DG
2208 /* Indicate that the session has been started once */
2209 ua_sess->started = 1;
2210
421cb601
DG
2211 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2212 if (ret < 0) {
f73fabfd 2213 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2214 goto error_rcu_unlock;
421cb601 2215 }
48842b30 2216
421cb601 2217 /* For each channel */
bec39940
DG
2218 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2219 node.node) {
421cb601
DG
2220 /* Create all streams */
2221 while (1) {
5b4a0ec0 2222 /* Create UST stream */
421cb601
DG
2223 ustream = zmalloc(sizeof(*ustream));
2224 if (ustream == NULL) {
2225 PERROR("zmalloc ust stream");
509cbaf8 2226 goto error_rcu_unlock;
421cb601 2227 }
48842b30 2228
4063050c
MD
2229 /* We are going to receive 2 fds, we need to reserve them. */
2230 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2231 if (ret < 0) {
2232 ERR("Exhausted number of available FD upon stream create");
2233 free(ustream);
2234 goto error_rcu_unlock;
2235 }
86acf0da
DG
2236
2237 health_code_update(&health_thread_cmd);
2238
852d0037 2239 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2240 &ustream->obj);
48842b30 2241 if (ret < 0) {
421cb601 2242 /* Got all streams */
4063050c 2243 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2244 free(ustream);
f73fabfd 2245 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2246 break;
48842b30 2247 }
421cb601 2248 ustream->handle = ustream->obj->handle;
48842b30 2249
86acf0da
DG
2250 health_code_update(&health_thread_cmd);
2251
421cb601
DG
2252 /* Order is important */
2253 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2254 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2255 ua_chan->name, ua_chan->streams.count);
2256 ua_chan->streams.count++;
aba8e916
DG
2257 if (ret < 0) {
2258 PERROR("asprintf UST create stream");
a2c0da86
MD
2259 /*
2260 * XXX what should we do here with the
2261 * stream ?
2262 */
421cb601 2263 continue;
aba8e916 2264 }
00e2e675
DG
2265 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2266 ustream->handle);
421cb601 2267 }
86acf0da
DG
2268
2269 health_code_update(&health_thread_cmd);
421cb601 2270 }
aba8e916 2271
7753dea8
MD
2272 switch (app->bits_per_long) {
2273 case 64:
173af62f
DG
2274 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2275 usess->consumer);
2276 if (socket == NULL) {
2277 goto skip_setup;
2278 }
7753dea8
MD
2279 break;
2280 case 32:
173af62f
DG
2281 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2282 usess->consumer);
2283 if (socket == NULL) {
2284 goto skip_setup;
2285 }
7753dea8
MD
2286 break;
2287 default:
2288 ret = -EINVAL;
2289 goto error_rcu_unlock;
2290 }
aea829b3 2291
421cb601 2292 /* Setup UST consumer socket and send fds to it */
173af62f 2293 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2294 if (ret < 0) {
509cbaf8 2295 goto error_rcu_unlock;
421cb601 2296 }
48842b30 2297
86acf0da
DG
2298 health_code_update(&health_thread_cmd);
2299
8be98f9a 2300skip_setup:
421cb601 2301 /* This start the UST tracing */
852d0037 2302 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2303 if (ret < 0) {
852d0037 2304 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2305 goto error_rcu_unlock;
421cb601 2306 }
5b4a0ec0 2307
86acf0da
DG
2308 health_code_update(&health_thread_cmd);
2309
421cb601 2310 /* Quiescent wait after starting trace */
852d0037 2311 ustctl_wait_quiescent(app->sock);
48842b30 2312
e0c7ec2b
DG
2313end:
2314 rcu_read_unlock();
86acf0da 2315 health_code_update(&health_thread_cmd);
421cb601 2316 return 0;
48842b30 2317
509cbaf8
MD
2318error_rcu_unlock:
2319 rcu_read_unlock();
86acf0da 2320 health_code_update(&health_thread_cmd);
421cb601
DG
2321 return -1;
2322}
48842b30 2323
8be98f9a
MD
2324/*
2325 * Stop tracing for a specific UST session and app.
2326 */
2327int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2328{
2329 int ret = 0;
bec39940 2330 struct lttng_ht_iter iter;
8be98f9a 2331 struct ust_app_session *ua_sess;
6d3686da 2332 struct ust_app_channel *ua_chan;
8be98f9a 2333
852d0037 2334 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2335
2336 rcu_read_lock();
2337
e0c7ec2b
DG
2338 if (!app->compatible) {
2339 goto end;
2340 }
2341
8be98f9a
MD
2342 ua_sess = lookup_session_by_app(usess, app);
2343 if (ua_sess == NULL) {
2344 /* Only malloc can failed so something is really wrong */
2345 goto error_rcu_unlock;
2346 }
2347
9bc07046
DG
2348 /*
2349 * If started = 0, it means that stop trace has been called for a session
2350 * that was never started. This is a code flow error and should never
2351 * happen.
2352 */
2353 assert(ua_sess->started == 1);
7db205b5 2354
86acf0da
DG
2355 health_code_update(&health_thread_cmd);
2356
9d6c7d3f 2357 /* This inhibits UST tracing */
852d0037 2358 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2359 if (ret < 0) {
852d0037 2360 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2361 goto error_rcu_unlock;
2362 }
2363
86acf0da
DG
2364 health_code_update(&health_thread_cmd);
2365
9d6c7d3f 2366 /* Quiescent wait after stopping trace */
852d0037 2367 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2368
86acf0da
DG
2369 health_code_update(&health_thread_cmd);
2370
9d6c7d3f 2371 /* Flushing buffers */
bec39940
DG
2372 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2373 node.node) {
86acf0da 2374 health_code_update(&health_thread_cmd);
852d0037 2375 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2376 if (ret < 0) {
7db205b5 2377 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2378 app->pid, ua_chan->name, ret);
6d3686da
DG
2379 /* Continuing flushing all buffers */
2380 continue;
8be98f9a
MD
2381 }
2382 }
8be98f9a 2383
86acf0da
DG
2384 health_code_update(&health_thread_cmd);
2385
90d97d10 2386 /* Flush all buffers before stopping */
852d0037 2387 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2388 if (ret < 0) {
852d0037 2389 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2390 ret);
90d97d10
DG
2391 }
2392
7db205b5
DG
2393end:
2394 rcu_read_unlock();
86acf0da 2395 health_code_update(&health_thread_cmd);
8be98f9a
MD
2396 return 0;
2397
2398error_rcu_unlock:
2399 rcu_read_unlock();
86acf0da 2400 health_code_update(&health_thread_cmd);
8be98f9a
MD
2401 return -1;
2402}
2403
84cd17c6
MD
2404/*
2405 * Destroy a specific UST session in apps.
2406 */
2407int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2408{
2409 struct ust_app_session *ua_sess;
2410 struct lttng_ust_object_data obj;
bec39940
DG
2411 struct lttng_ht_iter iter;
2412 struct lttng_ht_node_ulong *node;
525b0740 2413 int ret;
84cd17c6 2414
852d0037 2415 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2416
2417 rcu_read_lock();
2418
e0c7ec2b
DG
2419 if (!app->compatible) {
2420 goto end;
2421 }
2422
84cd17c6 2423 __lookup_session_by_app(usess, app, &iter);
bec39940 2424 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2425 if (node == NULL) {
2426 /* Only malloc can failed so something is really wrong */
2427 goto error_rcu_unlock;
2428 }
2429 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2430 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2431 assert(!ret);
84cd17c6
MD
2432 obj.handle = ua_sess->handle;
2433 obj.shm_fd = -1;
2434 obj.wait_fd = -1;
2435 obj.memory_map_size = 0;
86acf0da 2436 health_code_update(&health_thread_cmd);
852d0037 2437 ustctl_release_object(app->sock, &obj);
84cd17c6 2438
86acf0da 2439 health_code_update(&health_thread_cmd);
852d0037 2440 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2441
84cd17c6 2442 /* Quiescent wait after stopping trace */
852d0037 2443 ustctl_wait_quiescent(app->sock);
84cd17c6 2444
e0c7ec2b
DG
2445end:
2446 rcu_read_unlock();
86acf0da 2447 health_code_update(&health_thread_cmd);
84cd17c6
MD
2448 return 0;
2449
2450error_rcu_unlock:
2451 rcu_read_unlock();
86acf0da 2452 health_code_update(&health_thread_cmd);
84cd17c6
MD
2453 return -1;
2454}
2455
5b4a0ec0
DG
2456/*
2457 * Start tracing for the UST session.
2458 */
421cb601
DG
2459int ust_app_start_trace_all(struct ltt_ust_session *usess)
2460{
2461 int ret = 0;
bec39940 2462 struct lttng_ht_iter iter;
421cb601 2463 struct ust_app *app;
48842b30 2464
421cb601
DG
2465 DBG("Starting all UST traces");
2466
2467 rcu_read_lock();
421cb601 2468
852d0037 2469 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2470 ret = ust_app_start_trace(usess, app);
48842b30 2471 if (ret < 0) {
5b4a0ec0
DG
2472 /* Continue to next apps even on error */
2473 continue;
48842b30 2474 }
48842b30 2475 }
5b4a0ec0 2476
48842b30
DG
2477 rcu_read_unlock();
2478
2479 return 0;
2480}
487cf67c 2481
8be98f9a
MD
2482/*
2483 * Start tracing for the UST session.
2484 */
2485int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2486{
2487 int ret = 0;
bec39940 2488 struct lttng_ht_iter iter;
8be98f9a
MD
2489 struct ust_app *app;
2490
2491 DBG("Stopping all UST traces");
2492
2493 rcu_read_lock();
2494
852d0037 2495 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2496 ret = ust_app_stop_trace(usess, app);
2497 if (ret < 0) {
2498 /* Continue to next apps even on error */
2499 continue;
2500 }
2501 }
2502
2503 rcu_read_unlock();
2504
2505 return 0;
2506}
2507
84cd17c6
MD
2508/*
2509 * Destroy app UST session.
2510 */
2511int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2512{
2513 int ret = 0;
bec39940 2514 struct lttng_ht_iter iter;
84cd17c6
MD
2515 struct ust_app *app;
2516
2517 DBG("Destroy all UST traces");
2518
2519 rcu_read_lock();
2520
852d0037 2521 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2522 ret = ust_app_destroy_trace(usess, app);
2523 if (ret < 0) {
2524 /* Continue to next apps even on error */
2525 continue;
2526 }
2527 }
2528
2529 rcu_read_unlock();
2530
2531 return 0;
2532}
2533
5b4a0ec0
DG
2534/*
2535 * Add channels/events from UST global domain to registered apps at sock.
2536 */
487cf67c
DG
2537void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2538{
55c54cce 2539 int ret = 0;
727d5404 2540 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2541 struct ust_app *app;
2542 struct ust_app_session *ua_sess;
2543 struct ust_app_channel *ua_chan;
2544 struct ust_app_event *ua_event;
727d5404 2545 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2546
2547 if (usess == NULL) {
5b4a0ec0 2548 ERR("No UST session on global update. Returning");
1f3580c7
DG
2549 goto error;
2550 }
2551
a991f516
MD
2552 DBG2("UST app global update for app sock %d for session id %d", sock,
2553 usess->id);
487cf67c 2554
284d8f55
DG
2555 rcu_read_lock();
2556
487cf67c
DG
2557 app = find_app_by_sock(sock);
2558 if (app == NULL) {
2559 ERR("Failed to update app sock %d", sock);
2560 goto error;
2561 }
2562
e0c7ec2b
DG
2563 if (!app->compatible) {
2564 goto error;
2565 }
2566
421cb601 2567 ua_sess = create_ust_app_session(usess, app);
5b98a774
DG
2568 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2569 /* Tracer is gone for this session and has been freed */
487cf67c
DG
2570 goto error;
2571 }
2572
284d8f55
DG
2573 /*
2574 * We can iterate safely here over all UST app session sicne the create ust
2575 * app session above made a shadow copy of the UST global domain from the
2576 * ltt ust session.
2577 */
bec39940
DG
2578 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2579 node.node) {
284d8f55
DG
2580 ret = create_ust_channel(app, ua_sess, ua_chan);
2581 if (ret < 0) {
2582 /* FIXME: Should we quit here or continue... */
2583 continue;
487cf67c
DG
2584 }
2585
727d5404
DG
2586 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2587 node.node) {
2588 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2589 if (ret < 0) {
2590 /* FIXME: Should we quit here or continue... */
2591 continue;
2592 }
2593 }
2594
2595
284d8f55 2596 /* For each events */
bec39940
DG
2597 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2598 node.node) {
284d8f55
DG
2599 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2600 if (ret < 0) {
2601 /* FIXME: Should we quit here or continue... */
2602 continue;
487cf67c 2603 }
727d5404
DG
2604
2605 /* Add context on events. */
2606 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2607 ua_ctx, node.node) {
2608 ret = create_ust_event_context(ua_event, ua_ctx, app);
2609 if (ret < 0) {
2610 /* FIXME: Should we quit here or continue... */
2611 continue;
2612 }
2613 }
53a80697
MD
2614 ret = set_ust_event_filter(ua_event, app);
2615 if (ret < 0) {
2616 /* FIXME: Should we quit here or continue... */
2617 continue;
2618 }
36dc12cc 2619 }
487cf67c
DG
2620 }
2621
36dc12cc 2622 if (usess->start_trace) {
421cb601 2623 ret = ust_app_start_trace(usess, app);
36dc12cc 2624 if (ret < 0) {
36dc12cc
DG
2625 goto error;
2626 }
2627
852d0037 2628 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2629 }
2630
487cf67c
DG
2631error:
2632 rcu_read_unlock();
2633 return;
2634}
55cc08a6
DG
2635
2636/*
2637 * Add context to a specific channel for global UST domain.
2638 */
2639int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2640 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2641{
2642 int ret = 0;
bec39940
DG
2643 struct lttng_ht_node_str *ua_chan_node;
2644 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2645 struct ust_app_channel *ua_chan = NULL;
2646 struct ust_app_session *ua_sess;
2647 struct ust_app *app;
2648
2649 rcu_read_lock();
2650
852d0037 2651 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2652 if (!app->compatible) {
2653 /*
2654 * TODO: In time, we should notice the caller of this error by
2655 * telling him that this is a version error.
2656 */
2657 continue;
2658 }
55cc08a6
DG
2659 ua_sess = lookup_session_by_app(usess, app);
2660 if (ua_sess == NULL) {
2661 continue;
2662 }
2663
2664 /* Lookup channel in the ust app session */
bec39940
DG
2665 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2666 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2667 if (ua_chan_node == NULL) {
2668 continue;
2669 }
2670 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2671 node);
2672
2673 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2674 if (ret < 0) {
2675 continue;
2676 }
2677 }
2678
55cc08a6
DG
2679 rcu_read_unlock();
2680 return ret;
2681}
2682
2683/*
2684 * Add context to a specific event in a channel for global UST domain.
2685 */
2686int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2687 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2688 struct ltt_ust_context *uctx)
2689{
2690 int ret = 0;
bec39940
DG
2691 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2692 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2693 struct ust_app_session *ua_sess;
2694 struct ust_app_event *ua_event;
2695 struct ust_app_channel *ua_chan = NULL;
2696 struct ust_app *app;
2697
2698 rcu_read_lock();
2699
852d0037 2700 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2701 if (!app->compatible) {
2702 /*
2703 * TODO: In time, we should notice the caller of this error by
2704 * telling him that this is a version error.
2705 */
2706 continue;
2707 }
55cc08a6
DG
2708 ua_sess = lookup_session_by_app(usess, app);
2709 if (ua_sess == NULL) {
2710 continue;
2711 }
2712
2713 /* Lookup channel in the ust app session */
bec39940
DG
2714 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2715 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2716 if (ua_chan_node == NULL) {
2717 continue;
2718 }
2719 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2720 node);
2721
bec39940
DG
2722 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2723 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2724 if (ua_event_node == NULL) {
2725 continue;
2726 }
2727 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2728 node);
2729
2730 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2731 if (ret < 0) {
2732 continue;
2733 }
2734 }
2735
55cc08a6
DG
2736 rcu_read_unlock();
2737 return ret;
2738}
76d45b40 2739
53a80697
MD
2740/*
2741 * Add context to a specific event in a channel for global UST domain.
2742 */
2743int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2744 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2745 struct lttng_filter_bytecode *bytecode)
2746{
2747 int ret = 0;
2748 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2749 struct lttng_ht_iter iter, uiter;
2750 struct ust_app_session *ua_sess;
2751 struct ust_app_event *ua_event;
2752 struct ust_app_channel *ua_chan = NULL;
2753 struct ust_app *app;
2754
2755 rcu_read_lock();
2756
2757 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2758 if (!app->compatible) {
2759 /*
2760 * TODO: In time, we should notice the caller of this error by
2761 * telling him that this is a version error.
2762 */
2763 continue;
2764 }
2765 ua_sess = lookup_session_by_app(usess, app);
2766 if (ua_sess == NULL) {
2767 continue;
2768 }
2769
2770 /* Lookup channel in the ust app session */
2771 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2772 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2773 if (ua_chan_node == NULL) {
2774 continue;
2775 }
2776 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2777 node);
2778
2779 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2780 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2781 if (ua_event_node == NULL) {
2782 continue;
2783 }
2784 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2785 node);
2786
2787 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2788 if (ret < 0) {
2789 continue;
2790 }
2791 }
2792
2793 rcu_read_unlock();
2794 return ret;
2795}
2796
76d45b40
DG
2797/*
2798 * Enable event for a channel from a UST session for a specific PID.
2799 */
2800int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2801 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2802{
2803 int ret = 0;
bec39940
DG
2804 struct lttng_ht_iter iter;
2805 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2806 struct ust_app *app;
2807 struct ust_app_session *ua_sess;
2808 struct ust_app_channel *ua_chan;
2809 struct ust_app_event *ua_event;
2810
2811 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2812
2813 rcu_read_lock();
2814
2815 app = ust_app_find_by_pid(pid);
2816 if (app == NULL) {
2817 ERR("UST app enable event per PID %d not found", pid);
2818 ret = -1;
2819 goto error;
2820 }
2821
e0c7ec2b
DG
2822 if (!app->compatible) {
2823 ret = 0;
2824 goto error;
2825 }
2826
76d45b40
DG
2827 ua_sess = lookup_session_by_app(usess, app);
2828 /* If ua_sess is NULL, there is a code flow error */
2829 assert(ua_sess);
2830
2831 /* Lookup channel in the ust app session */
bec39940
DG
2832 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2833 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2834 /* If the channel is not found, there is a code flow error */
2835 assert(ua_chan_node);
2836
2837 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2838
bec39940
DG
2839 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2840 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2841 if (ua_event_node == NULL) {
2842 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2843 if (ret < 0) {
2844 goto error;
2845 }
2846 } else {
2847 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2848
2849 ret = enable_ust_app_event(ua_sess, ua_event, app);
2850 if (ret < 0) {
2851 goto error;
2852 }
2853 }
2854
2855error:
2856 rcu_read_unlock();
2857 return ret;
2858}
7f79d3a1
DG
2859
2860/*
2861 * Disable event for a channel from a UST session for a specific PID.
2862 */
2863int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2864 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2865{
2866 int ret = 0;
bec39940
DG
2867 struct lttng_ht_iter iter;
2868 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2869 struct ust_app *app;
2870 struct ust_app_session *ua_sess;
2871 struct ust_app_channel *ua_chan;
2872 struct ust_app_event *ua_event;
2873
2874 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2875
2876 rcu_read_lock();
2877
2878 app = ust_app_find_by_pid(pid);
2879 if (app == NULL) {
2880 ERR("UST app disable event per PID %d not found", pid);
2881 ret = -1;
2882 goto error;
2883 }
2884
e0c7ec2b
DG
2885 if (!app->compatible) {
2886 ret = 0;
2887 goto error;
2888 }
2889
7f79d3a1
DG
2890 ua_sess = lookup_session_by_app(usess, app);
2891 /* If ua_sess is NULL, there is a code flow error */
2892 assert(ua_sess);
2893
2894 /* Lookup channel in the ust app session */
bec39940
DG
2895 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2896 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2897 if (ua_chan_node == NULL) {
2898 /* Channel does not exist, skip disabling */
2899 goto error;
2900 }
2901 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2902
bec39940
DG
2903 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2904 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2905 if (ua_event_node == NULL) {
2906 /* Event does not exist, skip disabling */
2907 goto error;
2908 }
2909 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2910
2911 ret = disable_ust_app_event(ua_sess, ua_event, app);
2912 if (ret < 0) {
2913 goto error;
2914 }
2915
2916error:
2917 rcu_read_unlock();
2918 return ret;
2919}
e0c7ec2b
DG
2920
2921/*
2922 * Validate version of UST apps and set the compatible bit.
2923 */
2924int ust_app_validate_version(int sock)
2925{
2926 int ret;
2927 struct ust_app *app;
2928
2929 rcu_read_lock();
2930
2931 app = find_app_by_sock(sock);
2932 assert(app);
2933
86acf0da
DG
2934 health_code_update(&health_thread_cmd);
2935
e0c7ec2b
DG
2936 ret = ustctl_tracer_version(sock, &app->version);
2937 if (ret < 0) {
2938 goto error;
2939 }
2940
2941 /* Validate version */
aee0cea0 2942 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2943 goto error;
2944 }
2945
68264071 2946 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2947 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2948 UST_APP_MAJOR_VERSION);
2949 app->compatible = 1;
2950 rcu_read_unlock();
86acf0da 2951 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2952 return 0;
2953
2954error:
68264071 2955 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2956 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2957 UST_APP_MAJOR_VERSION);
2958 app->compatible = 0;
2959 rcu_read_unlock();
86acf0da 2960 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2961 return -1;
2962}
4466912f
DG
2963
2964/*
2965 * Calibrate registered applications.
2966 */
2967int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2968{
2969 int ret = 0;
2970 struct lttng_ht_iter iter;
2971 struct ust_app *app;
2972
2973 rcu_read_lock();
2974
852d0037 2975 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2976 if (!app->compatible) {
2977 /*
2978 * TODO: In time, we should notice the caller of this error by
2979 * telling him that this is a version error.
2980 */
2981 continue;
2982 }
2983
86acf0da
DG
2984 health_code_update(&health_thread_cmd);
2985
852d0037 2986 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2987 if (ret < 0) {
2988 switch (ret) {
2989 case -ENOSYS:
2990 /* Means that it's not implemented on the tracer side. */
2991 ret = 0;
2992 break;
2993 default:
2994 /* TODO: Report error to user */
2995 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2996 app->pid, ret);
4466912f
DG
2997 break;
2998 }
2999 }
3000 }
3001
3002 DBG("UST app global domain calibration finished");
3003
3004 rcu_read_unlock();
3005
86acf0da
DG
3006 health_code_update(&health_thread_cmd);
3007
4466912f
DG
3008 return ret;
3009}
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