Fix: Mismatch of field name between ust and tools
[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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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.
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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
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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 */
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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 */
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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
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242}
243
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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
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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
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328 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
329 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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559 health_code_update(&health_thread_cmd);
560
852d0037 561 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388
DG
562 if (ret < 0) {
563 ERR("UST app event %s enable failed for app (pid: %d) "
564 "and session handle %d with ret %d",
852d0037 565 ua_event->attr.name, app->pid, ua_sess->handle, ret);
edb67388
DG
566 goto error;
567 }
568
569 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 570 ua_event->attr.name, app->pid);
edb67388
DG
571
572error:
86acf0da 573 health_code_update(&health_thread_cmd);
edb67388
DG
574 return ret;
575}
576
099e26bd 577/*
5b4a0ec0 578 * Open metadata onto the UST tracer for a UST session.
0177d773 579 */
5b4a0ec0
DG
580static int open_ust_metadata(struct ust_app *app,
581 struct ust_app_session *ua_sess)
0177d773 582{
5b4a0ec0
DG
583 int ret;
584 struct lttng_ust_channel_attr uattr;
0177d773 585
86acf0da
DG
586 health_code_update(&health_thread_cmd);
587
5b4a0ec0
DG
588 uattr.overwrite = ua_sess->metadata->attr.overwrite;
589 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
590 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
591 uattr.switch_timer_interval =
592 ua_sess->metadata->attr.switch_timer_interval;
593 uattr.read_timer_interval =
594 ua_sess->metadata->attr.read_timer_interval;
595 uattr.output = ua_sess->metadata->attr.output;
596
4063050c
MD
597 /* We are going to receive 2 fds, we need to reserve them. */
598 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
599 if (ret < 0) {
600 ERR("Exhausted number of available FD upon metadata open");
601 goto error;
602 }
5b4a0ec0 603 /* UST tracer metadata creation */
852d0037 604 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
605 &ua_sess->metadata->obj);
606 if (ret < 0) {
fc34caaa 607 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 608 app->pid, ret);
f6a9efaa 609 goto error;
0177d773 610 }
f6a9efaa 611
6d3686da
DG
612 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
613
f6a9efaa 614error:
86acf0da 615 health_code_update(&health_thread_cmd);
5b4a0ec0 616 return ret;
91d76f53
DG
617}
618
619/*
5b4a0ec0 620 * Create stream onto the UST tracer for a UST session.
91d76f53 621 */
5b4a0ec0
DG
622static int create_ust_stream(struct ust_app *app,
623 struct ust_app_session *ua_sess)
91d76f53 624{
5b4a0ec0 625 int ret;
421cb601 626
86acf0da
DG
627 health_code_update(&health_thread_cmd);
628
4063050c
MD
629 /* We are going to receive 2 fds, we need to reserve them. */
630 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
631 if (ret < 0) {
632 ERR("Exhausted number of available FD upon metadata stream create");
633 goto error;
634 }
852d0037 635 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
636 &ua_sess->metadata->stream_obj);
637 if (ret < 0) {
638 ERR("UST create metadata stream failed");
421cb601 639 goto error;
91d76f53 640 }
421cb601 641
421cb601 642error:
86acf0da 643 health_code_update(&health_thread_cmd);
5b4a0ec0 644 return ret;
91d76f53
DG
645}
646
b551a063 647/*
5b4a0ec0 648 * Create the specified channel onto the UST tracer for a UST session.
b551a063 649 */
5b4a0ec0
DG
650static int create_ust_channel(struct ust_app *app,
651 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 652{
5b4a0ec0 653 int ret;
b551a063 654
86acf0da
DG
655 health_code_update(&health_thread_cmd);
656
5b4a0ec0 657 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
658
659 /* We are going to receive 2 fds, we need to reserve them. */
660 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
661 if (ret < 0) {
662 ERR("Exhausted number of available FD upon create channel");
663 goto error;
664 }
86acf0da
DG
665
666 health_code_update(&health_thread_cmd);
667
852d0037 668 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
669 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
670 if (ret < 0) {
58f3ca76 671 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 672 "and session handle %d with ret %d",
852d0037 673 ua_chan->name, app->pid, app->sock,
5b4a0ec0 674 ua_sess->handle, ret);
4063050c 675 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
676 goto error;
677 }
678
5b4a0ec0 679 ua_chan->handle = ua_chan->obj->handle;
b551a063 680
5b4a0ec0 681 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 682 ua_chan->name, app->pid, app->sock);
b551a063 683
86acf0da
DG
684 health_code_update(&health_thread_cmd);
685
8535a6d9
DG
686 /* If channel is not enabled, disable it on the tracer */
687 if (!ua_chan->enabled) {
688 ret = disable_ust_channel(app, ua_sess, ua_chan);
689 if (ret < 0) {
690 goto error;
691 }
692 }
693
b551a063 694error:
86acf0da 695 health_code_update(&health_thread_cmd);
b551a063
DG
696 return ret;
697}
698
91d76f53 699/*
5b4a0ec0 700 * Create the specified event onto the UST tracer for a UST session.
91d76f53 701 */
edb67388
DG
702static
703int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
704 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 705{
5b4a0ec0 706 int ret = 0;
284d8f55 707
86acf0da
DG
708 health_code_update(&health_thread_cmd);
709
5b4a0ec0 710 /* Create UST event on tracer */
852d0037 711 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
712 &ua_event->obj);
713 if (ret < 0) {
a027b2d2 714 if (ret == -EEXIST || ret == -EPERM) {
fc34caaa
DG
715 ret = 0;
716 goto error;
717 }
5b4a0ec0 718 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 719 ua_event->attr.name, app->pid, ret);
5b4a0ec0 720 goto error;
91d76f53 721 }
f6a9efaa 722
5b4a0ec0 723 ua_event->handle = ua_event->obj->handle;
284d8f55 724
5b4a0ec0 725 DBG2("UST app event %s created successfully for pid:%d",
852d0037 726 ua_event->attr.name, app->pid);
f6a9efaa 727
86acf0da
DG
728 health_code_update(&health_thread_cmd);
729
8535a6d9 730 /* If event not enabled, disable it on the tracer */
fc34caaa 731 if (ua_event->enabled == 0) {
8535a6d9
DG
732 ret = disable_ust_event(app, ua_sess, ua_event);
733 if (ret < 0) {
fc34caaa
DG
734 /*
735 * If we hit an EPERM, something is wrong with our disable call. If
736 * we get an EEXIST, there is a problem on the tracer side since we
737 * just created it.
738 */
739 switch (ret) {
740 case -EPERM:
741 /* Code flow problem */
742 assert(0);
743 case -EEXIST:
744 /* It's OK for our use case. */
745 ret = 0;
746 break;
747 default:
748 break;
749 }
8535a6d9
DG
750 goto error;
751 }
752 }
753
5b4a0ec0 754error:
86acf0da 755 health_code_update(&health_thread_cmd);
5b4a0ec0 756 return ret;
91d76f53 757}
48842b30 758
5b4a0ec0
DG
759/*
760 * Copy data between an UST app event and a LTT event.
761 */
421cb601 762static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
763 struct ltt_ust_event *uevent)
764{
bec39940 765 struct lttng_ht_iter iter;
55cc08a6
DG
766 struct ltt_ust_context *uctx;
767 struct ust_app_ctx *ua_ctx;
768
48842b30
DG
769 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
770 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
771
fc34caaa
DG
772 ua_event->enabled = uevent->enabled;
773
5b4a0ec0
DG
774 /* Copy event attributes */
775 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
776
53a80697
MD
777 /* Copy filter bytecode */
778 if (uevent->filter) {
779 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
780 uevent->filter->len);
781 if (!ua_event->filter) {
782 return;
783 }
784 memcpy(ua_event->filter, uevent->filter,
785 sizeof(*ua_event->filter) + uevent->filter->len);
786 }
bec39940 787 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
788 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
789 if (ua_ctx == NULL) {
fc34caaa
DG
790 /* malloc() failed. We should simply stop */
791 return;
55cc08a6 792 }
fc34caaa 793
bec39940
DG
794 lttng_ht_node_init_ulong(&ua_ctx->node,
795 (unsigned long) ua_ctx->ctx.ctx);
796 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 797 }
48842b30
DG
798}
799
5b4a0ec0
DG
800/*
801 * Copy data between an UST app channel and a LTT channel.
802 */
421cb601 803static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
804 struct ltt_ust_channel *uchan)
805{
bec39940
DG
806 struct lttng_ht_iter iter;
807 struct lttng_ht_node_str *ua_event_node;
48842b30 808 struct ltt_ust_event *uevent;
55cc08a6 809 struct ltt_ust_context *uctx;
48842b30 810 struct ust_app_event *ua_event;
55cc08a6 811 struct ust_app_ctx *ua_ctx;
48842b30 812
fc34caaa 813 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
814
815 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
816 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
817 /* Copy event attributes */
818 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 819
fc34caaa
DG
820 ua_chan->enabled = uchan->enabled;
821
bec39940 822 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
823 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
824 if (ua_ctx == NULL) {
825 continue;
826 }
bec39940
DG
827 lttng_ht_node_init_ulong(&ua_ctx->node,
828 (unsigned long) ua_ctx->ctx.ctx);
829 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 830 }
48842b30 831
421cb601 832 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
833 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
834 struct lttng_ht_iter uiter;
ba767faf 835
bec39940
DG
836 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
837 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 838 if (ua_event_node == NULL) {
421cb601 839 DBG2("UST event %s not found on shadow copy channel",
48842b30 840 uevent->attr.name);
284d8f55 841 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 842 if (ua_event == NULL) {
5b4a0ec0 843 continue;
48842b30 844 }
421cb601 845 shadow_copy_event(ua_event, uevent);
bec39940 846 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 847 }
48842b30
DG
848 }
849
fc34caaa 850 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
851}
852
5b4a0ec0
DG
853/*
854 * Copy data between a UST app session and a regular LTT session.
855 */
421cb601 856static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 857 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 858{
bec39940
DG
859 struct lttng_ht_node_str *ua_chan_node;
860 struct lttng_ht_iter iter;
48842b30
DG
861 struct ltt_ust_channel *uchan;
862 struct ust_app_channel *ua_chan;
477d7741
MD
863 time_t rawtime;
864 struct tm *timeinfo;
865 char datetime[16];
866 int ret;
867
868 /* Get date and time for unique app path */
869 time(&rawtime);
870 timeinfo = localtime(&rawtime);
871 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 872
421cb601 873 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 874
a991f516 875 ua_sess->id = usess->id;
6df2e2c9
MD
876 ua_sess->uid = usess->uid;
877 ua_sess->gid = usess->gid;
48842b30 878
00e2e675
DG
879 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
880 datetime);
477d7741
MD
881 if (ret < 0) {
882 PERROR("asprintf UST shadow copy session");
883 /* TODO: We cannot return an error from here.. */
884 assert(0);
885 }
886
48842b30
DG
887 /* TODO: support all UST domain */
888
889 /* Iterate over all channels in global domain. */
bec39940
DG
890 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
891 uchan, node.node) {
892 struct lttng_ht_iter uiter;
ba767faf 893
bec39940
DG
894 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
895 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 896 if (ua_chan_node != NULL) {
fc34caaa 897 /* Session exist. Contiuing. */
5b4a0ec0
DG
898 continue;
899 }
421cb601 900
5b4a0ec0
DG
901 DBG2("Channel %s not found on shadow session copy, creating it",
902 uchan->name);
903 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
904 if (ua_chan == NULL) {
fc34caaa 905 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 906 continue;
48842b30
DG
907 }
908
5b4a0ec0 909 shadow_copy_channel(ua_chan, uchan);
bec39940 910 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
911 }
912}
913
78f0bacd
DG
914/*
915 * Lookup sesison wrapper.
916 */
84cd17c6
MD
917static
918void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 919 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
920{
921 /* Get right UST app session from app */
2c348c10 922 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
923}
924
421cb601
DG
925/*
926 * Return ust app session from the app session hashtable using the UST session
a991f516 927 * id.
421cb601 928 */
48842b30
DG
929static struct ust_app_session *lookup_session_by_app(
930 struct ltt_ust_session *usess, struct ust_app *app)
931{
bec39940
DG
932 struct lttng_ht_iter iter;
933 struct lttng_ht_node_ulong *node;
48842b30 934
84cd17c6 935 __lookup_session_by_app(usess, app, &iter);
bec39940 936 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
937 if (node == NULL) {
938 goto error;
939 }
940
941 return caa_container_of(node, struct ust_app_session, node);
942
943error:
944 return NULL;
945}
946
421cb601
DG
947/*
948 * Create a UST session onto the tracer of app and add it the session
949 * hashtable.
950 *
951 * Return ust app session or NULL on error.
952 */
953static struct ust_app_session *create_ust_app_session(
954 struct ltt_ust_session *usess, struct ust_app *app)
955{
956 int ret;
957 struct ust_app_session *ua_sess;
958
86acf0da
DG
959 health_code_update(&health_thread_cmd);
960
421cb601
DG
961 ua_sess = lookup_session_by_app(usess, app);
962 if (ua_sess == NULL) {
a991f516 963 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 964 app->pid, usess->id);
421cb601
DG
965 ua_sess = alloc_ust_app_session();
966 if (ua_sess == NULL) {
967 /* Only malloc can failed so something is really wrong */
fc34caaa 968 goto end;
421cb601 969 }
477d7741 970 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
971 }
972
86acf0da
DG
973 health_code_update(&health_thread_cmd);
974
421cb601 975 if (ua_sess->handle == -1) {
852d0037 976 ret = ustctl_create_session(app->sock);
421cb601 977 if (ret < 0) {
852d0037 978 ERR("Creating session for app pid %d", app->pid);
915d047c
DG
979 /* This means that the tracer is gone... */
980 ua_sess = (void*) -1UL;
421cb601
DG
981 goto error;
982 }
983
421cb601
DG
984 ua_sess->handle = ret;
985
986 /* Add ust app session to app's HT */
2c348c10 987 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 988 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
989
990 DBG2("UST app session created successfully with handle %d", ret);
991 }
992
fc34caaa 993end:
86acf0da 994 health_code_update(&health_thread_cmd);
421cb601
DG
995 return ua_sess;
996
997error:
fc34caaa 998 delete_ust_app_session(-1, ua_sess);
86acf0da 999 health_code_update(&health_thread_cmd);
421cb601
DG
1000 return NULL;
1001}
1002
55cc08a6
DG
1003/*
1004 * Create a context for the channel on the tracer.
1005 */
1006static
1007int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1008 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1009 struct ust_app *app)
1010{
1011 int ret = 0;
bec39940
DG
1012 struct lttng_ht_iter iter;
1013 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1014 struct ust_app_ctx *ua_ctx;
1015
1016 DBG2("UST app adding context to channel %s", ua_chan->name);
1017
bec39940
DG
1018 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1019 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1020 if (node != NULL) {
1021 ret = -EEXIST;
1022 goto error;
1023 }
1024
1025 ua_ctx = alloc_ust_app_ctx(uctx);
1026 if (ua_ctx == NULL) {
1027 /* malloc failed */
1028 ret = -1;
1029 goto error;
1030 }
1031
bec39940
DG
1032 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1033 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1034
1035 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1036 if (ret < 0) {
1037 goto error;
1038 }
1039
1040error:
1041 return ret;
1042}
1043
1044/*
1045 * Create an UST context and enable it for the event on the tracer.
1046 */
1047static
1048int create_ust_app_event_context(struct ust_app_session *ua_sess,
1049 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1050 struct ust_app *app)
1051{
1052 int ret = 0;
bec39940
DG
1053 struct lttng_ht_iter iter;
1054 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1055 struct ust_app_ctx *ua_ctx;
1056
1057 DBG2("UST app adding context to event %s", ua_event->name);
1058
bec39940
DG
1059 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1060 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1061 if (node != NULL) {
1062 ret = -EEXIST;
1063 goto error;
1064 }
1065
1066 ua_ctx = alloc_ust_app_ctx(uctx);
1067 if (ua_ctx == NULL) {
1068 /* malloc failed */
1069 ret = -1;
1070 goto error;
1071 }
1072
bec39940
DG
1073 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1074 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
1075
1076 ret = create_ust_event_context(ua_event, ua_ctx, app);
1077 if (ret < 0) {
1078 goto error;
1079 }
1080
1081error:
1082 return ret;
1083}
1084
53a80697
MD
1085/*
1086 * Set UST filter for the event on the tracer.
1087 */
1088static
1089int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1090 struct ust_app_event *ua_event,
1091 struct lttng_filter_bytecode *bytecode,
1092 struct ust_app *app)
1093{
1094 int ret = 0;
1095
1096 DBG2("UST app adding context to event %s", ua_event->name);
1097
1098 /* Copy filter bytecode */
1099 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1100 if (!ua_event->filter) {
1101 return -ENOMEM;
1102 }
1103 memcpy(ua_event->filter, bytecode,
1104 sizeof(*ua_event->filter) + bytecode->len);
1105 ret = set_ust_event_filter(ua_event, app);
1106 if (ret < 0) {
1107 goto error;
1108 }
1109
1110error:
1111 return ret;
1112}
1113
edb67388
DG
1114/*
1115 * Enable on the tracer side a ust app event for the session and channel.
1116 */
1117static
1118int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1119 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1120{
1121 int ret;
1122
1123 ret = enable_ust_event(app, ua_sess, ua_event);
1124 if (ret < 0) {
1125 goto error;
1126 }
1127
1128 ua_event->enabled = 1;
1129
1130error:
1131 return ret;
1132}
1133
9730260e
DG
1134/*
1135 * Disable on the tracer side a ust app event for the session and channel.
1136 */
1137static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1138 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1139{
1140 int ret;
1141
1142 ret = disable_ust_event(app, ua_sess, ua_event);
1143 if (ret < 0) {
1144 goto error;
1145 }
1146
1147 ua_event->enabled = 0;
1148
1149error:
1150 return ret;
1151}
1152
78f0bacd
DG
1153/*
1154 * Lookup ust app channel for session and disable it on the tracer side.
1155 */
8535a6d9
DG
1156static
1157int disable_ust_app_channel(struct ust_app_session *ua_sess,
1158 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1159{
8535a6d9 1160 int ret;
78f0bacd
DG
1161
1162 ret = disable_ust_channel(app, ua_sess, ua_chan);
1163 if (ret < 0) {
1164 goto error;
1165 }
1166
8535a6d9
DG
1167 ua_chan->enabled = 0;
1168
78f0bacd
DG
1169error:
1170 return ret;
1171}
1172
1173/*
1174 * Lookup ust app channel for session and enable it on the tracer side.
1175 */
1176static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1177 struct ltt_ust_channel *uchan, struct ust_app *app)
1178{
1179 int ret = 0;
bec39940
DG
1180 struct lttng_ht_iter iter;
1181 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1182 struct ust_app_channel *ua_chan;
1183
bec39940
DG
1184 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1185 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1186 if (ua_chan_node == NULL) {
a991f516
MD
1187 DBG2("Unable to find channel %s in ust session id %u",
1188 uchan->name, ua_sess->id);
78f0bacd
DG
1189 goto error;
1190 }
1191
1192 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1193
1194 ret = enable_ust_channel(app, ua_sess, ua_chan);
1195 if (ret < 0) {
1196 goto error;
1197 }
1198
1199error:
1200 return ret;
1201}
1202
284d8f55 1203/*
5b4a0ec0 1204 * Create UST app channel and create it on the tracer.
284d8f55 1205 */
5b4a0ec0
DG
1206static struct ust_app_channel *create_ust_app_channel(
1207 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1208 struct ust_app *app)
1209{
1210 int ret = 0;
bec39940
DG
1211 struct lttng_ht_iter iter;
1212 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1213 struct ust_app_channel *ua_chan;
1214
1215 /* Lookup channel in the ust app session */
bec39940
DG
1216 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1217 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1218 if (ua_chan_node != NULL) {
5b4a0ec0 1219 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1220 goto end;
5b4a0ec0
DG
1221 }
1222
fc34caaa
DG
1223 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1224 if (ua_chan == NULL) {
1225 /* Only malloc can fail here */
1226 goto error;
1227 }
1228 shadow_copy_channel(ua_chan, uchan);
1229
5b4a0ec0
DG
1230 ret = create_ust_channel(app, ua_sess, ua_chan);
1231 if (ret < 0) {
fc34caaa
DG
1232 /* Not found previously means that it does not exist on the tracer */
1233 assert(ret != -EEXIST);
5b4a0ec0
DG
1234 goto error;
1235 }
1236
58f3ca76
DG
1237 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1238
fc34caaa 1239 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1240 app->pid);
fc34caaa
DG
1241
1242end:
5b4a0ec0
DG
1243 return ua_chan;
1244
1245error:
fc34caaa 1246 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1247 return NULL;
1248}
1249
1250/*
1251 * Create UST app event and create it on the tracer side.
1252 */
edb67388
DG
1253static
1254int create_ust_app_event(struct ust_app_session *ua_sess,
1255 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1256 struct ust_app *app)
284d8f55 1257{
edb67388 1258 int ret = 0;
bec39940
DG
1259 struct lttng_ht_iter iter;
1260 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1261 struct ust_app_event *ua_event;
284d8f55 1262
5b4a0ec0 1263 /* Get event node */
bec39940
DG
1264 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1265 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1266 if (ua_event_node != NULL) {
fc34caaa 1267 ret = -EEXIST;
edb67388
DG
1268 goto end;
1269 }
5b4a0ec0 1270
edb67388
DG
1271 /* Does not exist so create one */
1272 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1273 if (ua_event == NULL) {
1274 /* Only malloc can failed so something is really wrong */
1275 ret = -ENOMEM;
fc34caaa 1276 goto end;
5b4a0ec0 1277 }
edb67388 1278 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1279
edb67388 1280 /* Create it on the tracer side */
5b4a0ec0 1281 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1282 if (ret < 0) {
fc34caaa
DG
1283 /* Not found previously means that it does not exist on the tracer */
1284 assert(ret != -EEXIST);
284d8f55
DG
1285 goto error;
1286 }
1287
bec39940 1288 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1289
fc34caaa 1290 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1291 app->pid);
7f79d3a1 1292
edb67388 1293end:
fc34caaa
DG
1294 return ret;
1295
5b4a0ec0 1296error:
fc34caaa
DG
1297 /* Valid. Calling here is already in a read side lock */
1298 delete_ust_app_event(-1, ua_event);
edb67388 1299 return ret;
5b4a0ec0
DG
1300}
1301
1302/*
1303 * Create UST metadata and open it on the tracer side.
1304 */
1305static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1306 char *pathname, struct ust_app *app)
1307{
1308 int ret = 0;
1309
1310 if (ua_sess->metadata == NULL) {
1311 /* Allocate UST metadata */
1312 ua_sess->metadata = trace_ust_create_metadata(pathname);
1313 if (ua_sess->metadata == NULL) {
fc34caaa 1314 /* malloc() failed */
5b4a0ec0
DG
1315 goto error;
1316 }
1317
1318 ret = open_ust_metadata(app, ua_sess);
1319 if (ret < 0) {
7db205b5
DG
1320 DBG3("Opening metadata failed. Cleaning up memory");
1321
fc34caaa
DG
1322 /* Cleanup failed metadata struct */
1323 free(ua_sess->metadata);
7db205b5
DG
1324 /*
1325 * This is very important because delete_ust_app_session check if
1326 * the pointer is null or not in order to delete the metadata.
1327 */
1328 ua_sess->metadata = NULL;
5b4a0ec0
DG
1329 goto error;
1330 }
1331
852d0037 1332 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1333 }
1334
1335 /* Open UST metadata stream */
1336 if (ua_sess->metadata->stream_obj == NULL) {
1337 ret = create_ust_stream(app, ua_sess);
1338 if (ret < 0) {
1339 goto error;
1340 }
1341
477d7741
MD
1342 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1343 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1344 if (ret < 0) {
1345 PERROR("asprintf UST create stream");
1346 goto error;
1347 }
1348
1349 DBG2("UST metadata stream object created for app pid %d",
852d0037 1350 app->pid);
5b4a0ec0
DG
1351 } else {
1352 ERR("Attempting to create stream without metadata opened");
1353 goto error;
1354 }
1355
1356 return 0;
1357
1358error:
1359 return -1;
1360}
1361
1362/*
1363 * Return pointer to traceable apps list.
1364 */
bec39940 1365struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1366{
1367 return ust_app_ht;
1368}
1369
1370/*
1371 * Return ust app pointer or NULL if not found.
1372 */
1373struct ust_app *ust_app_find_by_pid(pid_t pid)
1374{
bec39940
DG
1375 struct lttng_ht_node_ulong *node;
1376 struct lttng_ht_iter iter;
5b4a0ec0
DG
1377
1378 rcu_read_lock();
bec39940
DG
1379 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1380 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1381 if (node == NULL) {
1382 DBG2("UST app no found with pid %d", pid);
1383 goto error;
1384 }
1385 rcu_read_unlock();
1386
1387 DBG2("Found UST app by pid %d", pid);
1388
852d0037 1389 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1390
1391error:
1392 rcu_read_unlock();
1393 return NULL;
1394}
1395
1396/*
1397 * Using pid and uid (of the app), allocate a new ust_app struct and
1398 * add it to the global traceable app list.
1399 *
0df502fd
MD
1400 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1401 * bitness is not supported.
5b4a0ec0
DG
1402 */
1403int ust_app_register(struct ust_register_msg *msg, int sock)
1404{
1405 struct ust_app *lta;
799e2c4f 1406 int ret;
5b4a0ec0 1407
173af62f
DG
1408 if ((msg->bits_per_long == 64 &&
1409 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1410 || (msg->bits_per_long == 32 &&
1411 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1412 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1413 "%d-bit long, but no consumerd for this long size is available.\n",
1414 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1415 ret = close(sock);
1416 if (ret) {
1417 PERROR("close");
1418 }
4063050c 1419 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1420 return -EINVAL;
1421 }
3f2c5fcc
MD
1422 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1423 ERR("Registration failed: application \"%s\" (pid: %d) has "
1424 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1425 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1426 ret = close(sock);
1427 if (ret) {
1428 PERROR("close");
1429 }
4063050c 1430 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1431 return -EINVAL;
1432 }
5b4a0ec0
DG
1433 lta = zmalloc(sizeof(struct ust_app));
1434 if (lta == NULL) {
1435 PERROR("malloc");
1436 return -ENOMEM;
1437 }
1438
1439 lta->ppid = msg->ppid;
1440 lta->uid = msg->uid;
1441 lta->gid = msg->gid;
e0c7ec2b 1442 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1443 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1444 lta->v_major = msg->major;
1445 lta->v_minor = msg->minor;
1446 strncpy(lta->name, msg->name, sizeof(lta->name));
1447 lta->name[16] = '\0';
bec39940 1448 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1449
852d0037
DG
1450 lta->pid = msg->pid;
1451 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1452 lta->sock = sock;
1453 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1454
1455 rcu_read_lock();
852d0037
DG
1456
1457 /*
1458 * On a re-registration, we want to kick out the previous registration of
1459 * that pid
1460 */
1461 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1462
1463 /*
1464 * The socket _should_ be unique until _we_ call close. So, a add_unique
1465 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1466 * already in the table.
1467 */
1468 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1469
5b4a0ec0
DG
1470 rcu_read_unlock();
1471
1472 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1473 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1474 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1475
1476 return 0;
1477}
1478
1479/*
1480 * Unregister app by removing it from the global traceable app list and freeing
1481 * the data struct.
1482 *
1483 * The socket is already closed at this point so no close to sock.
1484 */
1485void ust_app_unregister(int sock)
1486{
1487 struct ust_app *lta;
bec39940
DG
1488 struct lttng_ht_node_ulong *node;
1489 struct lttng_ht_iter iter;
525b0740 1490 int ret;
5b4a0ec0
DG
1491
1492 rcu_read_lock();
886459c6 1493
5b4a0ec0 1494 /* Get the node reference for a call_rcu */
852d0037 1495 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1496 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1497 if (node == NULL) {
852d0037 1498 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1499 goto error;
1500 }
284d8f55 1501
852d0037
DG
1502 lta = caa_container_of(node, struct ust_app, sock_n);
1503
1504 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1505
886459c6 1506 /* Remove application from PID hash table */
852d0037
DG
1507 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1508 assert(!ret);
1509
1510 /* Assign second node for deletion */
1511 iter.iter.node = &lta->pid_n.node;
1512
bec39940 1513 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1514 assert(!ret);
852d0037
DG
1515
1516 /* Free memory */
1517 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1518
284d8f55 1519error:
5b4a0ec0
DG
1520 rcu_read_unlock();
1521 return;
284d8f55
DG
1522}
1523
1524/*
5b4a0ec0 1525 * Return traceable_app_count
284d8f55 1526 */
5b4a0ec0 1527unsigned long ust_app_list_count(void)
284d8f55 1528{
5b4a0ec0 1529 unsigned long count;
284d8f55 1530
5b4a0ec0 1531 rcu_read_lock();
bec39940 1532 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1533 rcu_read_unlock();
284d8f55 1534
5b4a0ec0 1535 return count;
284d8f55
DG
1536}
1537
5b4a0ec0
DG
1538/*
1539 * Fill events array with all events name of all registered apps.
1540 */
1541int ust_app_list_events(struct lttng_event **events)
421cb601 1542{
5b4a0ec0
DG
1543 int ret, handle;
1544 size_t nbmem, count = 0;
bec39940 1545 struct lttng_ht_iter iter;
5b4a0ec0
DG
1546 struct ust_app *app;
1547 struct lttng_event *tmp;
421cb601 1548
5b4a0ec0
DG
1549 nbmem = UST_APP_EVENT_LIST_SIZE;
1550 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1551 if (tmp == NULL) {
1552 PERROR("zmalloc ust app events");
1553 ret = -ENOMEM;
421cb601
DG
1554 goto error;
1555 }
1556
5b4a0ec0 1557 rcu_read_lock();
421cb601 1558
852d0037 1559 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1560 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1561
86acf0da
DG
1562 health_code_update(&health_thread_cmd);
1563
e0c7ec2b
DG
1564 if (!app->compatible) {
1565 /*
1566 * TODO: In time, we should notice the caller of this error by
1567 * telling him that this is a version error.
1568 */
1569 continue;
1570 }
852d0037 1571 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1572 if (handle < 0) {
1573 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1574 app->pid);
5b4a0ec0
DG
1575 continue;
1576 }
421cb601 1577
852d0037 1578 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1579 &uiter)) != -ENOENT) {
86acf0da 1580 health_code_update(&health_thread_cmd);
815564d8
MD
1581 if (count >= nbmem) {
1582 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1583 2 * nbmem);
1584 nbmem *= 2;
2f221590 1585 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1586 if (tmp == NULL) {
1587 PERROR("realloc ust app events");
1588 ret = -ENOMEM;
1589 goto rcu_error;
1590 }
1591 }
90eaa0d2 1592 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1593 tmp[count].loglevel = uiter.loglevel;
6775595e 1594 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1595 tmp[count].pid = app->pid;
5b4a0ec0
DG
1596 tmp[count].enabled = -1;
1597 count++;
421cb601 1598 }
421cb601
DG
1599 }
1600
5b4a0ec0
DG
1601 ret = count;
1602 *events = tmp;
421cb601 1603
5b4a0ec0 1604 DBG2("UST app list events done (%zu events)", count);
421cb601 1605
5b4a0ec0
DG
1606rcu_error:
1607 rcu_read_unlock();
421cb601 1608error:
86acf0da 1609 health_code_update(&health_thread_cmd);
5b4a0ec0 1610 return ret;
421cb601
DG
1611}
1612
f37d259d
MD
1613/*
1614 * Fill events array with all events name of all registered apps.
1615 */
1616int ust_app_list_event_fields(struct lttng_event_field **fields)
1617{
1618 int ret, handle;
1619 size_t nbmem, count = 0;
1620 struct lttng_ht_iter iter;
1621 struct ust_app *app;
1622 struct lttng_event_field *tmp;
1623
1624 nbmem = UST_APP_EVENT_LIST_SIZE;
1625 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1626 if (tmp == NULL) {
1627 PERROR("zmalloc ust app event fields");
1628 ret = -ENOMEM;
1629 goto error;
1630 }
1631
1632 rcu_read_lock();
1633
1634 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1635 struct lttng_ust_field_iter uiter;
1636
86acf0da
DG
1637 health_code_update(&health_thread_cmd);
1638
f37d259d
MD
1639 if (!app->compatible) {
1640 /*
1641 * TODO: In time, we should notice the caller of this error by
1642 * telling him that this is a version error.
1643 */
1644 continue;
1645 }
1646 handle = ustctl_tracepoint_field_list(app->sock);
1647 if (handle < 0) {
1648 ERR("UST app list event fields getting handle failed for app pid %d",
1649 app->pid);
1650 continue;
1651 }
1652
1653 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1654 &uiter)) != -ENOENT) {
86acf0da 1655 health_code_update(&health_thread_cmd);
f37d259d
MD
1656 if (count >= nbmem) {
1657 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1658 2 * nbmem);
1659 nbmem *= 2;
1660 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1661 if (tmp == NULL) {
1662 PERROR("realloc ust app event fields");
1663 ret = -ENOMEM;
1664 goto rcu_error;
1665 }
1666 }
f37d259d
MD
1667
1668 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1669 tmp[count].type = uiter.type;
590b9e3c 1670 tmp[count].nowrite = uiter.nowrite;
f37d259d
MD
1671
1672 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1673 tmp[count].event.loglevel = uiter.loglevel;
1674 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1675 tmp[count].event.pid = app->pid;
1676 tmp[count].event.enabled = -1;
1677 count++;
1678 }
1679 }
1680
1681 ret = count;
1682 *fields = tmp;
1683
1684 DBG2("UST app list event fields done (%zu events)", count);
1685
1686rcu_error:
1687 rcu_read_unlock();
1688error:
86acf0da 1689 health_code_update(&health_thread_cmd);
f37d259d
MD
1690 return ret;
1691}
1692
5b4a0ec0
DG
1693/*
1694 * Free and clean all traceable apps of the global list.
1695 */
1696void ust_app_clean_list(void)
421cb601 1697{
5b4a0ec0 1698 int ret;
bec39940
DG
1699 struct lttng_ht_iter iter;
1700 struct lttng_ht_node_ulong *node;
421cb601 1701
5b4a0ec0 1702 DBG2("UST app cleaning registered apps hash table");
421cb601 1703
5b4a0ec0 1704 rcu_read_lock();
421cb601 1705
bec39940
DG
1706 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1707 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1708 assert(!ret);
bec39940 1709 call_rcu(&node->head, delete_ust_app_rcu);
421cb601
DG
1710 }
1711
852d0037
DG
1712 /* Cleanup socket hash table */
1713 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1714 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1715 assert(!ret);
1716 }
852d0037 1717
bec39940 1718 /* Destroy is done only when the ht is empty */
852d0037
DG
1719 lttng_ht_destroy(ust_app_ht);
1720 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1721
5b4a0ec0
DG
1722 rcu_read_unlock();
1723}
1724
1725/*
1726 * Init UST app hash table.
1727 */
1728void ust_app_ht_alloc(void)
1729{
bec39940 1730 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1731 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1732}
1733
78f0bacd
DG
1734/*
1735 * For a specific UST session, disable the channel for all registered apps.
1736 */
35a9059d 1737int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1738 struct ltt_ust_channel *uchan)
1739{
1740 int ret = 0;
bec39940
DG
1741 struct lttng_ht_iter iter;
1742 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1743 struct ust_app *app;
1744 struct ust_app_session *ua_sess;
8535a6d9 1745 struct ust_app_channel *ua_chan;
78f0bacd
DG
1746
1747 if (usess == NULL || uchan == NULL) {
1748 ERR("Disabling UST global channel with NULL values");
1749 ret = -1;
1750 goto error;
1751 }
1752
a991f516
MD
1753 DBG2("UST app disabling channel %s from global domain for session id %d",
1754 uchan->name, usess->id);
78f0bacd
DG
1755
1756 rcu_read_lock();
1757
1758 /* For every registered applications */
852d0037 1759 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1760 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1761 if (!app->compatible) {
1762 /*
1763 * TODO: In time, we should notice the caller of this error by
1764 * telling him that this is a version error.
1765 */
1766 continue;
1767 }
78f0bacd
DG
1768 ua_sess = lookup_session_by_app(usess, app);
1769 if (ua_sess == NULL) {
1770 continue;
1771 }
1772
8535a6d9 1773 /* Get channel */
bec39940
DG
1774 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1775 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1776 /* If the session if found for the app, the channel must be there */
1777 assert(ua_chan_node);
1778
1779 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1780 /* The channel must not be already disabled */
1781 assert(ua_chan->enabled == 1);
1782
1783 /* Disable channel onto application */
1784 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1785 if (ret < 0) {
1786 /* XXX: We might want to report this error at some point... */
1787 continue;
1788 }
1789 }
1790
1791 rcu_read_unlock();
1792
1793error:
1794 return ret;
1795}
1796
1797/*
1798 * For a specific UST session, enable the channel for all registered apps.
1799 */
35a9059d 1800int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1801 struct ltt_ust_channel *uchan)
1802{
1803 int ret = 0;
bec39940 1804 struct lttng_ht_iter iter;
78f0bacd
DG
1805 struct ust_app *app;
1806 struct ust_app_session *ua_sess;
1807
1808 if (usess == NULL || uchan == NULL) {
1809 ERR("Adding UST global channel to NULL values");
1810 ret = -1;
1811 goto error;
1812 }
1813
a991f516
MD
1814 DBG2("UST app enabling channel %s to global domain for session id %d",
1815 uchan->name, usess->id);
78f0bacd
DG
1816
1817 rcu_read_lock();
1818
1819 /* For every registered applications */
852d0037 1820 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1821 if (!app->compatible) {
1822 /*
1823 * TODO: In time, we should notice the caller of this error by
1824 * telling him that this is a version error.
1825 */
1826 continue;
1827 }
78f0bacd
DG
1828 ua_sess = lookup_session_by_app(usess, app);
1829 if (ua_sess == NULL) {
1830 continue;
1831 }
1832
1833 /* Enable channel onto application */
1834 ret = enable_ust_app_channel(ua_sess, uchan, app);
1835 if (ret < 0) {
1836 /* XXX: We might want to report this error at some point... */
1837 continue;
1838 }
1839 }
1840
1841 rcu_read_unlock();
1842
1843error:
1844 return ret;
1845}
1846
b0a40d28
DG
1847/*
1848 * Disable an event in a channel and for a specific session.
1849 */
35a9059d
DG
1850int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1851 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1852{
1853 int ret = 0;
bec39940
DG
1854 struct lttng_ht_iter iter, uiter;
1855 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1856 struct ust_app *app;
1857 struct ust_app_session *ua_sess;
1858 struct ust_app_channel *ua_chan;
1859 struct ust_app_event *ua_event;
1860
1861 DBG("UST app disabling event %s for all apps in channel "
a991f516 1862 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1863
1864 rcu_read_lock();
1865
1866 /* For all registered applications */
852d0037 1867 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1868 if (!app->compatible) {
1869 /*
1870 * TODO: In time, we should notice the caller of this error by
1871 * telling him that this is a version error.
1872 */
1873 continue;
1874 }
b0a40d28
DG
1875 ua_sess = lookup_session_by_app(usess, app);
1876 if (ua_sess == NULL) {
1877 /* Next app */
1878 continue;
1879 }
1880
1881 /* Lookup channel in the ust app session */
bec39940
DG
1882 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1883 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1884 if (ua_chan_node == NULL) {
a991f516 1885 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1886 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1887 continue;
1888 }
1889 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1890
bec39940
DG
1891 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1892 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1893 if (ua_event_node == NULL) {
1894 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1895 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1896 continue;
1897 }
1898 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1899
7f79d3a1 1900 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1901 if (ret < 0) {
1902 /* XXX: Report error someday... */
1903 continue;
1904 }
1905 }
1906
1907 rcu_read_unlock();
1908
1909 return ret;
1910}
1911
9730260e 1912/*
edb67388 1913 * For a specific UST session and UST channel, the event for all
9730260e
DG
1914 * registered apps.
1915 */
35a9059d 1916int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1917 struct ltt_ust_channel *uchan)
1918{
1919 int ret = 0;
bec39940
DG
1920 struct lttng_ht_iter iter, uiter;
1921 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1922 struct ust_app *app;
1923 struct ust_app_session *ua_sess;
1924 struct ust_app_channel *ua_chan;
1925 struct ust_app_event *ua_event;
1926
1927 DBG("UST app disabling all event for all apps in channel "
a991f516 1928 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1929
1930 rcu_read_lock();
1931
1932 /* For all registered applications */
852d0037 1933 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1934 if (!app->compatible) {
1935 /*
1936 * TODO: In time, we should notice the caller of this error by
1937 * telling him that this is a version error.
1938 */
1939 continue;
1940 }
9730260e 1941 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1942 /* If ua_sess is NULL, there is a code flow error */
1943 assert(ua_sess);
9730260e
DG
1944
1945 /* Lookup channel in the ust app session */
bec39940
DG
1946 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1947 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1948 /* If the channel is not found, there is a code flow error */
1949 assert(ua_chan_node);
1950
9730260e
DG
1951 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1952
1953 /* Disable each events of channel */
bec39940
DG
1954 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1955 node.node) {
7f79d3a1 1956 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1957 if (ret < 0) {
1958 /* XXX: Report error someday... */
1959 continue;
1960 }
1961 }
1962 }
1963
1964 rcu_read_unlock();
1965
1966 return ret;
1967}
1968
421cb601 1969/*
5b4a0ec0 1970 * For a specific UST session, create the channel for all registered apps.
421cb601 1971 */
35a9059d 1972int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1973 struct ltt_ust_channel *uchan)
1974{
bec39940 1975 struct lttng_ht_iter iter;
48842b30
DG
1976 struct ust_app *app;
1977 struct ust_app_session *ua_sess;
1978 struct ust_app_channel *ua_chan;
1979
fc34caaa
DG
1980 /* Very wrong code flow */
1981 assert(usess);
1982 assert(uchan);
421cb601 1983
a991f516
MD
1984 DBG2("UST app adding channel %s to global domain for session id %d",
1985 uchan->name, usess->id);
48842b30
DG
1986
1987 rcu_read_lock();
421cb601 1988
5b4a0ec0 1989 /* For every registered applications */
852d0037 1990 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1991 if (!app->compatible) {
1992 /*
1993 * TODO: In time, we should notice the caller of this error by
1994 * telling him that this is a version error.
1995 */
1996 continue;
1997 }
edb67388
DG
1998 /*
1999 * Create session on the tracer side and add it to app session HT. Note
2000 * that if session exist, it will simply return a pointer to the ust
2001 * app session.
2002 */
421cb601 2003 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2004 if (ua_sess == NULL) {
915d047c 2005 /* The malloc() failed. */
fc34caaa 2006 goto error;
915d047c
DG
2007 } else if (ua_sess == (void *) -1UL) {
2008 /* The application's socket is not valid. Contiuing */
2009 continue;
48842b30
DG
2010 }
2011
421cb601
DG
2012 /* Create channel onto application */
2013 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2014 if (ua_chan == NULL) {
fc34caaa
DG
2015 /* Major problem here and it's maybe the tracer or malloc() */
2016 goto error;
48842b30 2017 }
48842b30 2018 }
5b4a0ec0 2019
48842b30
DG
2020 rcu_read_unlock();
2021
fc34caaa
DG
2022 return 0;
2023
421cb601 2024error:
fc34caaa 2025 return -1;
48842b30
DG
2026}
2027
5b4a0ec0 2028/*
edb67388 2029 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2030 */
35a9059d 2031int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2032 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2033{
2034 int ret = 0;
bec39940
DG
2035 struct lttng_ht_iter iter, uiter;
2036 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
2037 struct ust_app *app;
2038 struct ust_app_session *ua_sess;
2039 struct ust_app_channel *ua_chan;
2040 struct ust_app_event *ua_event;
48842b30 2041
a991f516
MD
2042 DBG("UST app enabling event %s for all apps for session id %d",
2043 uevent->attr.name, usess->id);
48842b30 2044
edb67388
DG
2045 /*
2046 * NOTE: At this point, this function is called only if the session and
2047 * channel passed are already created for all apps. and enabled on the
2048 * tracer also.
2049 */
2050
48842b30 2051 rcu_read_lock();
421cb601
DG
2052
2053 /* For all registered applications */
852d0037 2054 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2055 if (!app->compatible) {
2056 /*
2057 * TODO: In time, we should notice the caller of this error by
2058 * telling him that this is a version error.
2059 */
2060 continue;
2061 }
edb67388
DG
2062 ua_sess = lookup_session_by_app(usess, app);
2063 /* If ua_sess is NULL, there is a code flow error */
2064 assert(ua_sess);
ba767faf 2065
edb67388 2066 /* Lookup channel in the ust app session */
bec39940
DG
2067 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2068 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2069 /* If the channel is not found, there is a code flow error */
2070 assert(ua_chan_node);
2071
2072 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2073
bec39940
DG
2074 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2075 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 2076 if (ua_event_node == NULL) {
7f79d3a1 2077 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2078 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2079 continue;
2080 }
2081 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2082
2083 ret = enable_ust_app_event(ua_sess, ua_event, app);
2084 if (ret < 0) {
7f79d3a1 2085 goto error;
48842b30 2086 }
edb67388
DG
2087 }
2088
7f79d3a1 2089error:
edb67388 2090 rcu_read_unlock();
edb67388
DG
2091 return ret;
2092}
2093
2094/*
2095 * For a specific existing UST session and UST channel, creates the event for
2096 * all registered apps.
2097 */
35a9059d 2098int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2099 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2100{
2101 int ret = 0;
bec39940
DG
2102 struct lttng_ht_iter iter, uiter;
2103 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2104 struct ust_app *app;
2105 struct ust_app_session *ua_sess;
2106 struct ust_app_channel *ua_chan;
2107
a991f516
MD
2108 DBG("UST app creating event %s for all apps for session id %d",
2109 uevent->attr.name, usess->id);
edb67388 2110
edb67388
DG
2111 rcu_read_lock();
2112
2113 /* For all registered applications */
852d0037 2114 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2115 if (!app->compatible) {
2116 /*
2117 * TODO: In time, we should notice the caller of this error by
2118 * telling him that this is a version error.
2119 */
2120 continue;
2121 }
edb67388
DG
2122 ua_sess = lookup_session_by_app(usess, app);
2123 /* If ua_sess is NULL, there is a code flow error */
2124 assert(ua_sess);
48842b30
DG
2125
2126 /* Lookup channel in the ust app session */
bec39940
DG
2127 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2128 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2129 /* If the channel is not found, there is a code flow error */
2130 assert(ua_chan_node);
2131
48842b30
DG
2132 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2133
edb67388
DG
2134 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2135 if (ret < 0) {
fc34caaa
DG
2136 if (ret != -EEXIST) {
2137 /* Possible value at this point: -ENOMEM. If so, we stop! */
2138 break;
2139 }
2140 DBG2("UST app event %s already exist on app PID %d",
852d0037 2141 uevent->attr.name, app->pid);
5b4a0ec0 2142 continue;
48842b30 2143 }
48842b30 2144 }
5b4a0ec0 2145
48842b30
DG
2146 rcu_read_unlock();
2147
2148 return ret;
2149}
2150
5b4a0ec0
DG
2151/*
2152 * Start tracing for a specific UST session and app.
2153 */
421cb601 2154int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2155{
2156 int ret = 0;
bec39940 2157 struct lttng_ht_iter iter;
48842b30
DG
2158 struct ust_app_session *ua_sess;
2159 struct ust_app_channel *ua_chan;
5b4a0ec0 2160 struct ltt_ust_stream *ustream;
173af62f 2161 struct consumer_socket *socket;
48842b30 2162
852d0037 2163 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2164
509cbaf8
MD
2165 rcu_read_lock();
2166
e0c7ec2b
DG
2167 if (!app->compatible) {
2168 goto end;
2169 }
2170
421cb601
DG
2171 ua_sess = lookup_session_by_app(usess, app);
2172 if (ua_sess == NULL) {
509cbaf8 2173 goto error_rcu_unlock;
421cb601 2174 }
48842b30 2175
aea829b3
DG
2176 /* Upon restart, we skip the setup, already done */
2177 if (ua_sess->started) {
8be98f9a 2178 goto skip_setup;
aea829b3 2179 }
8be98f9a 2180
a4b92340
DG
2181 /* Create directories if consumer is LOCAL and has a path defined. */
2182 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2183 strlen(usess->consumer->dst.trace_path) > 0) {
2184 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2185 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2186 if (ret < 0) {
2187 if (ret != -EEXIST) {
2188 ERR("Trace directory creation error");
2189 ret = -1;
2190 goto error_rcu_unlock;
2191 }
2192 }
2193 }
2194
f848c3eb
DG
2195 /* Indicate that the session has been started once */
2196 ua_sess->started = 1;
2197
421cb601
DG
2198 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2199 if (ret < 0) {
f73fabfd 2200 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2201 goto error_rcu_unlock;
421cb601 2202 }
48842b30 2203
421cb601 2204 /* For each channel */
bec39940
DG
2205 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2206 node.node) {
421cb601
DG
2207 /* Create all streams */
2208 while (1) {
5b4a0ec0 2209 /* Create UST stream */
421cb601
DG
2210 ustream = zmalloc(sizeof(*ustream));
2211 if (ustream == NULL) {
2212 PERROR("zmalloc ust stream");
509cbaf8 2213 goto error_rcu_unlock;
421cb601 2214 }
48842b30 2215
4063050c
MD
2216 /* We are going to receive 2 fds, we need to reserve them. */
2217 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2218 if (ret < 0) {
2219 ERR("Exhausted number of available FD upon stream create");
2220 free(ustream);
2221 goto error_rcu_unlock;
2222 }
86acf0da
DG
2223
2224 health_code_update(&health_thread_cmd);
2225
852d0037 2226 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2227 &ustream->obj);
48842b30 2228 if (ret < 0) {
421cb601 2229 /* Got all streams */
4063050c 2230 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2231 free(ustream);
f73fabfd 2232 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2233 break;
48842b30 2234 }
421cb601 2235 ustream->handle = ustream->obj->handle;
48842b30 2236
86acf0da
DG
2237 health_code_update(&health_thread_cmd);
2238
421cb601
DG
2239 /* Order is important */
2240 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675
DG
2241 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2242 ua_chan->name, ua_chan->streams.count++);
aba8e916
DG
2243 if (ret < 0) {
2244 PERROR("asprintf UST create stream");
a2c0da86
MD
2245 /*
2246 * XXX what should we do here with the
2247 * stream ?
2248 */
421cb601 2249 continue;
aba8e916 2250 }
00e2e675
DG
2251 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2252 ustream->handle);
421cb601 2253 }
86acf0da
DG
2254
2255 health_code_update(&health_thread_cmd);
421cb601 2256 }
aba8e916 2257
7753dea8
MD
2258 switch (app->bits_per_long) {
2259 case 64:
173af62f
DG
2260 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2261 usess->consumer);
2262 if (socket == NULL) {
2263 goto skip_setup;
2264 }
7753dea8
MD
2265 break;
2266 case 32:
173af62f
DG
2267 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2268 usess->consumer);
2269 if (socket == NULL) {
2270 goto skip_setup;
2271 }
7753dea8
MD
2272 break;
2273 default:
2274 ret = -EINVAL;
2275 goto error_rcu_unlock;
2276 }
aea829b3 2277
421cb601 2278 /* Setup UST consumer socket and send fds to it */
173af62f 2279 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2280 if (ret < 0) {
509cbaf8 2281 goto error_rcu_unlock;
421cb601 2282 }
48842b30 2283
86acf0da
DG
2284 health_code_update(&health_thread_cmd);
2285
8be98f9a 2286skip_setup:
421cb601 2287 /* This start the UST tracing */
852d0037 2288 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2289 if (ret < 0) {
852d0037 2290 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2291 goto error_rcu_unlock;
421cb601 2292 }
5b4a0ec0 2293
86acf0da
DG
2294 health_code_update(&health_thread_cmd);
2295
421cb601 2296 /* Quiescent wait after starting trace */
852d0037 2297 ustctl_wait_quiescent(app->sock);
48842b30 2298
e0c7ec2b
DG
2299end:
2300 rcu_read_unlock();
86acf0da 2301 health_code_update(&health_thread_cmd);
421cb601 2302 return 0;
48842b30 2303
509cbaf8
MD
2304error_rcu_unlock:
2305 rcu_read_unlock();
86acf0da 2306 health_code_update(&health_thread_cmd);
421cb601
DG
2307 return -1;
2308}
48842b30 2309
8be98f9a
MD
2310/*
2311 * Stop tracing for a specific UST session and app.
2312 */
2313int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2314{
2315 int ret = 0;
bec39940 2316 struct lttng_ht_iter iter;
8be98f9a 2317 struct ust_app_session *ua_sess;
6d3686da 2318 struct ust_app_channel *ua_chan;
8be98f9a 2319
852d0037 2320 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2321
2322 rcu_read_lock();
2323
e0c7ec2b
DG
2324 if (!app->compatible) {
2325 goto end;
2326 }
2327
8be98f9a
MD
2328 ua_sess = lookup_session_by_app(usess, app);
2329 if (ua_sess == NULL) {
2330 /* Only malloc can failed so something is really wrong */
2331 goto error_rcu_unlock;
2332 }
2333
9bc07046
DG
2334 /*
2335 * If started = 0, it means that stop trace has been called for a session
2336 * that was never started. This is a code flow error and should never
2337 * happen.
2338 */
2339 assert(ua_sess->started == 1);
7db205b5 2340
86acf0da
DG
2341 health_code_update(&health_thread_cmd);
2342
9d6c7d3f 2343 /* This inhibits UST tracing */
852d0037 2344 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2345 if (ret < 0) {
852d0037 2346 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2347 goto error_rcu_unlock;
2348 }
2349
86acf0da
DG
2350 health_code_update(&health_thread_cmd);
2351
9d6c7d3f 2352 /* Quiescent wait after stopping trace */
852d0037 2353 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2354
86acf0da
DG
2355 health_code_update(&health_thread_cmd);
2356
9d6c7d3f 2357 /* Flushing buffers */
bec39940
DG
2358 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2359 node.node) {
86acf0da 2360 health_code_update(&health_thread_cmd);
852d0037 2361 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2362 if (ret < 0) {
7db205b5 2363 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2364 app->pid, ua_chan->name, ret);
6d3686da
DG
2365 /* Continuing flushing all buffers */
2366 continue;
8be98f9a
MD
2367 }
2368 }
8be98f9a 2369
86acf0da
DG
2370 health_code_update(&health_thread_cmd);
2371
90d97d10 2372 /* Flush all buffers before stopping */
852d0037 2373 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2374 if (ret < 0) {
852d0037 2375 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2376 ret);
90d97d10
DG
2377 }
2378
7db205b5
DG
2379end:
2380 rcu_read_unlock();
86acf0da 2381 health_code_update(&health_thread_cmd);
8be98f9a
MD
2382 return 0;
2383
2384error_rcu_unlock:
2385 rcu_read_unlock();
86acf0da 2386 health_code_update(&health_thread_cmd);
8be98f9a
MD
2387 return -1;
2388}
2389
84cd17c6
MD
2390/*
2391 * Destroy a specific UST session in apps.
2392 */
2393int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2394{
2395 struct ust_app_session *ua_sess;
2396 struct lttng_ust_object_data obj;
bec39940
DG
2397 struct lttng_ht_iter iter;
2398 struct lttng_ht_node_ulong *node;
525b0740 2399 int ret;
84cd17c6 2400
852d0037 2401 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2402
2403 rcu_read_lock();
2404
e0c7ec2b
DG
2405 if (!app->compatible) {
2406 goto end;
2407 }
2408
84cd17c6 2409 __lookup_session_by_app(usess, app, &iter);
bec39940 2410 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2411 if (node == NULL) {
2412 /* Only malloc can failed so something is really wrong */
2413 goto error_rcu_unlock;
2414 }
2415 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2416 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2417 assert(!ret);
84cd17c6
MD
2418 obj.handle = ua_sess->handle;
2419 obj.shm_fd = -1;
2420 obj.wait_fd = -1;
2421 obj.memory_map_size = 0;
86acf0da 2422 health_code_update(&health_thread_cmd);
852d0037 2423 ustctl_release_object(app->sock, &obj);
84cd17c6 2424
86acf0da 2425 health_code_update(&health_thread_cmd);
852d0037 2426 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2427
84cd17c6 2428 /* Quiescent wait after stopping trace */
852d0037 2429 ustctl_wait_quiescent(app->sock);
84cd17c6 2430
e0c7ec2b
DG
2431end:
2432 rcu_read_unlock();
86acf0da 2433 health_code_update(&health_thread_cmd);
84cd17c6
MD
2434 return 0;
2435
2436error_rcu_unlock:
2437 rcu_read_unlock();
86acf0da 2438 health_code_update(&health_thread_cmd);
84cd17c6
MD
2439 return -1;
2440}
2441
5b4a0ec0
DG
2442/*
2443 * Start tracing for the UST session.
2444 */
421cb601
DG
2445int ust_app_start_trace_all(struct ltt_ust_session *usess)
2446{
2447 int ret = 0;
bec39940 2448 struct lttng_ht_iter iter;
421cb601 2449 struct ust_app *app;
48842b30 2450
421cb601
DG
2451 DBG("Starting all UST traces");
2452
2453 rcu_read_lock();
421cb601 2454
852d0037 2455 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2456 ret = ust_app_start_trace(usess, app);
48842b30 2457 if (ret < 0) {
5b4a0ec0
DG
2458 /* Continue to next apps even on error */
2459 continue;
48842b30 2460 }
48842b30 2461 }
5b4a0ec0 2462
48842b30
DG
2463 rcu_read_unlock();
2464
2465 return 0;
2466}
487cf67c 2467
8be98f9a
MD
2468/*
2469 * Start tracing for the UST session.
2470 */
2471int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2472{
2473 int ret = 0;
bec39940 2474 struct lttng_ht_iter iter;
8be98f9a
MD
2475 struct ust_app *app;
2476
2477 DBG("Stopping all UST traces");
2478
2479 rcu_read_lock();
2480
852d0037 2481 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2482 ret = ust_app_stop_trace(usess, app);
2483 if (ret < 0) {
2484 /* Continue to next apps even on error */
2485 continue;
2486 }
2487 }
2488
2489 rcu_read_unlock();
2490
2491 return 0;
2492}
2493
84cd17c6
MD
2494/*
2495 * Destroy app UST session.
2496 */
2497int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2498{
2499 int ret = 0;
bec39940 2500 struct lttng_ht_iter iter;
84cd17c6
MD
2501 struct ust_app *app;
2502
2503 DBG("Destroy all UST traces");
2504
2505 rcu_read_lock();
2506
852d0037 2507 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2508 ret = ust_app_destroy_trace(usess, app);
2509 if (ret < 0) {
2510 /* Continue to next apps even on error */
2511 continue;
2512 }
2513 }
2514
2515 rcu_read_unlock();
2516
2517 return 0;
2518}
2519
5b4a0ec0
DG
2520/*
2521 * Add channels/events from UST global domain to registered apps at sock.
2522 */
487cf67c
DG
2523void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2524{
55c54cce 2525 int ret = 0;
727d5404 2526 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2527 struct ust_app *app;
2528 struct ust_app_session *ua_sess;
2529 struct ust_app_channel *ua_chan;
2530 struct ust_app_event *ua_event;
727d5404 2531 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2532
2533 if (usess == NULL) {
5b4a0ec0 2534 ERR("No UST session on global update. Returning");
1f3580c7
DG
2535 goto error;
2536 }
2537
a991f516
MD
2538 DBG2("UST app global update for app sock %d for session id %d", sock,
2539 usess->id);
487cf67c 2540
284d8f55
DG
2541 rcu_read_lock();
2542
487cf67c
DG
2543 app = find_app_by_sock(sock);
2544 if (app == NULL) {
2545 ERR("Failed to update app sock %d", sock);
2546 goto error;
2547 }
2548
e0c7ec2b
DG
2549 if (!app->compatible) {
2550 goto error;
2551 }
2552
421cb601 2553 ua_sess = create_ust_app_session(usess, app);
487cf67c 2554 if (ua_sess == NULL) {
487cf67c
DG
2555 goto error;
2556 }
2557
284d8f55
DG
2558 /*
2559 * We can iterate safely here over all UST app session sicne the create ust
2560 * app session above made a shadow copy of the UST global domain from the
2561 * ltt ust session.
2562 */
bec39940
DG
2563 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2564 node.node) {
284d8f55
DG
2565 ret = create_ust_channel(app, ua_sess, ua_chan);
2566 if (ret < 0) {
2567 /* FIXME: Should we quit here or continue... */
2568 continue;
487cf67c
DG
2569 }
2570
727d5404
DG
2571 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2572 node.node) {
2573 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2574 if (ret < 0) {
2575 /* FIXME: Should we quit here or continue... */
2576 continue;
2577 }
2578 }
2579
2580
284d8f55 2581 /* For each events */
bec39940
DG
2582 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2583 node.node) {
284d8f55
DG
2584 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2585 if (ret < 0) {
2586 /* FIXME: Should we quit here or continue... */
2587 continue;
487cf67c 2588 }
727d5404
DG
2589
2590 /* Add context on events. */
2591 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2592 ua_ctx, node.node) {
2593 ret = create_ust_event_context(ua_event, ua_ctx, app);
2594 if (ret < 0) {
2595 /* FIXME: Should we quit here or continue... */
2596 continue;
2597 }
2598 }
53a80697
MD
2599 ret = set_ust_event_filter(ua_event, app);
2600 if (ret < 0) {
2601 /* FIXME: Should we quit here or continue... */
2602 continue;
2603 }
36dc12cc 2604 }
487cf67c
DG
2605 }
2606
36dc12cc 2607 if (usess->start_trace) {
421cb601 2608 ret = ust_app_start_trace(usess, app);
36dc12cc 2609 if (ret < 0) {
36dc12cc
DG
2610 goto error;
2611 }
2612
852d0037 2613 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2614 }
2615
487cf67c
DG
2616error:
2617 rcu_read_unlock();
2618 return;
2619}
55cc08a6
DG
2620
2621/*
2622 * Add context to a specific channel for global UST domain.
2623 */
2624int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2625 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2626{
2627 int ret = 0;
bec39940
DG
2628 struct lttng_ht_node_str *ua_chan_node;
2629 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2630 struct ust_app_channel *ua_chan = NULL;
2631 struct ust_app_session *ua_sess;
2632 struct ust_app *app;
2633
2634 rcu_read_lock();
2635
852d0037 2636 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2637 if (!app->compatible) {
2638 /*
2639 * TODO: In time, we should notice the caller of this error by
2640 * telling him that this is a version error.
2641 */
2642 continue;
2643 }
55cc08a6
DG
2644 ua_sess = lookup_session_by_app(usess, app);
2645 if (ua_sess == NULL) {
2646 continue;
2647 }
2648
2649 /* Lookup channel in the ust app session */
bec39940
DG
2650 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2651 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2652 if (ua_chan_node == NULL) {
2653 continue;
2654 }
2655 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2656 node);
2657
2658 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2659 if (ret < 0) {
2660 continue;
2661 }
2662 }
2663
55cc08a6
DG
2664 rcu_read_unlock();
2665 return ret;
2666}
2667
2668/*
2669 * Add context to a specific event in a channel for global UST domain.
2670 */
2671int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2672 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2673 struct ltt_ust_context *uctx)
2674{
2675 int ret = 0;
bec39940
DG
2676 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2677 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2678 struct ust_app_session *ua_sess;
2679 struct ust_app_event *ua_event;
2680 struct ust_app_channel *ua_chan = NULL;
2681 struct ust_app *app;
2682
2683 rcu_read_lock();
2684
852d0037 2685 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2686 if (!app->compatible) {
2687 /*
2688 * TODO: In time, we should notice the caller of this error by
2689 * telling him that this is a version error.
2690 */
2691 continue;
2692 }
55cc08a6
DG
2693 ua_sess = lookup_session_by_app(usess, app);
2694 if (ua_sess == NULL) {
2695 continue;
2696 }
2697
2698 /* Lookup channel in the ust app session */
bec39940
DG
2699 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2700 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2701 if (ua_chan_node == NULL) {
2702 continue;
2703 }
2704 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2705 node);
2706
bec39940
DG
2707 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2708 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2709 if (ua_event_node == NULL) {
2710 continue;
2711 }
2712 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2713 node);
2714
2715 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2716 if (ret < 0) {
2717 continue;
2718 }
2719 }
2720
55cc08a6
DG
2721 rcu_read_unlock();
2722 return ret;
2723}
76d45b40 2724
53a80697
MD
2725/*
2726 * Add context to a specific event in a channel for global UST domain.
2727 */
2728int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2729 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2730 struct lttng_filter_bytecode *bytecode)
2731{
2732 int ret = 0;
2733 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2734 struct lttng_ht_iter iter, uiter;
2735 struct ust_app_session *ua_sess;
2736 struct ust_app_event *ua_event;
2737 struct ust_app_channel *ua_chan = NULL;
2738 struct ust_app *app;
2739
2740 rcu_read_lock();
2741
2742 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2743 if (!app->compatible) {
2744 /*
2745 * TODO: In time, we should notice the caller of this error by
2746 * telling him that this is a version error.
2747 */
2748 continue;
2749 }
2750 ua_sess = lookup_session_by_app(usess, app);
2751 if (ua_sess == NULL) {
2752 continue;
2753 }
2754
2755 /* Lookup channel in the ust app session */
2756 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2757 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2758 if (ua_chan_node == NULL) {
2759 continue;
2760 }
2761 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2762 node);
2763
2764 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2765 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2766 if (ua_event_node == NULL) {
2767 continue;
2768 }
2769 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2770 node);
2771
2772 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2773 if (ret < 0) {
2774 continue;
2775 }
2776 }
2777
2778 rcu_read_unlock();
2779 return ret;
2780}
2781
76d45b40
DG
2782/*
2783 * Enable event for a channel from a UST session for a specific PID.
2784 */
2785int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2786 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2787{
2788 int ret = 0;
bec39940
DG
2789 struct lttng_ht_iter iter;
2790 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2791 struct ust_app *app;
2792 struct ust_app_session *ua_sess;
2793 struct ust_app_channel *ua_chan;
2794 struct ust_app_event *ua_event;
2795
2796 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2797
2798 rcu_read_lock();
2799
2800 app = ust_app_find_by_pid(pid);
2801 if (app == NULL) {
2802 ERR("UST app enable event per PID %d not found", pid);
2803 ret = -1;
2804 goto error;
2805 }
2806
e0c7ec2b
DG
2807 if (!app->compatible) {
2808 ret = 0;
2809 goto error;
2810 }
2811
76d45b40
DG
2812 ua_sess = lookup_session_by_app(usess, app);
2813 /* If ua_sess is NULL, there is a code flow error */
2814 assert(ua_sess);
2815
2816 /* Lookup channel in the ust app session */
bec39940
DG
2817 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2818 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2819 /* If the channel is not found, there is a code flow error */
2820 assert(ua_chan_node);
2821
2822 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2823
bec39940
DG
2824 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2825 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2826 if (ua_event_node == NULL) {
2827 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2828 if (ret < 0) {
2829 goto error;
2830 }
2831 } else {
2832 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2833
2834 ret = enable_ust_app_event(ua_sess, ua_event, app);
2835 if (ret < 0) {
2836 goto error;
2837 }
2838 }
2839
2840error:
2841 rcu_read_unlock();
2842 return ret;
2843}
7f79d3a1
DG
2844
2845/*
2846 * Disable event for a channel from a UST session for a specific PID.
2847 */
2848int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2849 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2850{
2851 int ret = 0;
bec39940
DG
2852 struct lttng_ht_iter iter;
2853 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2854 struct ust_app *app;
2855 struct ust_app_session *ua_sess;
2856 struct ust_app_channel *ua_chan;
2857 struct ust_app_event *ua_event;
2858
2859 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2860
2861 rcu_read_lock();
2862
2863 app = ust_app_find_by_pid(pid);
2864 if (app == NULL) {
2865 ERR("UST app disable event per PID %d not found", pid);
2866 ret = -1;
2867 goto error;
2868 }
2869
e0c7ec2b
DG
2870 if (!app->compatible) {
2871 ret = 0;
2872 goto error;
2873 }
2874
7f79d3a1
DG
2875 ua_sess = lookup_session_by_app(usess, app);
2876 /* If ua_sess is NULL, there is a code flow error */
2877 assert(ua_sess);
2878
2879 /* Lookup channel in the ust app session */
bec39940
DG
2880 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2881 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2882 if (ua_chan_node == NULL) {
2883 /* Channel does not exist, skip disabling */
2884 goto error;
2885 }
2886 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2887
bec39940
DG
2888 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2889 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2890 if (ua_event_node == NULL) {
2891 /* Event does not exist, skip disabling */
2892 goto error;
2893 }
2894 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2895
2896 ret = disable_ust_app_event(ua_sess, ua_event, app);
2897 if (ret < 0) {
2898 goto error;
2899 }
2900
2901error:
2902 rcu_read_unlock();
2903 return ret;
2904}
e0c7ec2b
DG
2905
2906/*
2907 * Validate version of UST apps and set the compatible bit.
2908 */
2909int ust_app_validate_version(int sock)
2910{
2911 int ret;
2912 struct ust_app *app;
2913
2914 rcu_read_lock();
2915
2916 app = find_app_by_sock(sock);
2917 assert(app);
2918
86acf0da
DG
2919 health_code_update(&health_thread_cmd);
2920
e0c7ec2b
DG
2921 ret = ustctl_tracer_version(sock, &app->version);
2922 if (ret < 0) {
2923 goto error;
2924 }
2925
2926 /* Validate version */
aee0cea0 2927 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2928 goto error;
2929 }
2930
68264071 2931 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2932 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2933 UST_APP_MAJOR_VERSION);
2934 app->compatible = 1;
2935 rcu_read_unlock();
86acf0da 2936 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2937 return 0;
2938
2939error:
68264071 2940 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2941 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2942 UST_APP_MAJOR_VERSION);
2943 app->compatible = 0;
2944 rcu_read_unlock();
86acf0da 2945 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2946 return -1;
2947}
4466912f
DG
2948
2949/*
2950 * Calibrate registered applications.
2951 */
2952int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2953{
2954 int ret = 0;
2955 struct lttng_ht_iter iter;
2956 struct ust_app *app;
2957
2958 rcu_read_lock();
2959
852d0037 2960 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2961 if (!app->compatible) {
2962 /*
2963 * TODO: In time, we should notice the caller of this error by
2964 * telling him that this is a version error.
2965 */
2966 continue;
2967 }
2968
86acf0da
DG
2969 health_code_update(&health_thread_cmd);
2970
852d0037 2971 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2972 if (ret < 0) {
2973 switch (ret) {
2974 case -ENOSYS:
2975 /* Means that it's not implemented on the tracer side. */
2976 ret = 0;
2977 break;
2978 default:
2979 /* TODO: Report error to user */
2980 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2981 app->pid, ret);
4466912f
DG
2982 break;
2983 }
2984 }
2985 }
2986
2987 DBG("UST app global domain calibration finished");
2988
2989 rcu_read_unlock();
2990
86acf0da
DG
2991 health_code_update(&health_thread_cmd);
2992
4466912f
DG
2993 return ret;
2994}
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