Fix: Cleanup UST app session on ustctl create session error
[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 */
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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 /*
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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();
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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;
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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';
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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 */
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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566 goto error;
567 }
568
569 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 570 ua_event->attr.name, app->pid);
edb67388
DG
571
572error:
86acf0da 573 health_code_update(&health_thread_cmd);
edb67388
DG
574 return ret;
575}
576
099e26bd 577/*
5b4a0ec0 578 * Open metadata onto the UST tracer for a UST session.
0177d773 579 */
5b4a0ec0
DG
580static int open_ust_metadata(struct ust_app *app,
581 struct ust_app_session *ua_sess)
0177d773 582{
5b4a0ec0
DG
583 int ret;
584 struct lttng_ust_channel_attr uattr;
0177d773 585
86acf0da
DG
586 health_code_update(&health_thread_cmd);
587
5b4a0ec0
DG
588 uattr.overwrite = ua_sess->metadata->attr.overwrite;
589 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
590 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
591 uattr.switch_timer_interval =
592 ua_sess->metadata->attr.switch_timer_interval;
593 uattr.read_timer_interval =
594 ua_sess->metadata->attr.read_timer_interval;
595 uattr.output = ua_sess->metadata->attr.output;
596
4063050c
MD
597 /* We are going to receive 2 fds, we need to reserve them. */
598 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
599 if (ret < 0) {
600 ERR("Exhausted number of available FD upon metadata open");
601 goto error;
602 }
5b4a0ec0 603 /* UST tracer metadata creation */
852d0037 604 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
605 &ua_sess->metadata->obj);
606 if (ret < 0) {
fc34caaa 607 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 608 app->pid, ret);
f6a9efaa 609 goto error;
0177d773 610 }
f6a9efaa 611
6d3686da
DG
612 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
613
f6a9efaa 614error:
86acf0da 615 health_code_update(&health_thread_cmd);
5b4a0ec0 616 return ret;
91d76f53
DG
617}
618
619/*
5b4a0ec0 620 * Create stream onto the UST tracer for a UST session.
91d76f53 621 */
5b4a0ec0
DG
622static int create_ust_stream(struct ust_app *app,
623 struct ust_app_session *ua_sess)
91d76f53 624{
5b4a0ec0 625 int ret;
421cb601 626
86acf0da
DG
627 health_code_update(&health_thread_cmd);
628
4063050c
MD
629 /* We are going to receive 2 fds, we need to reserve them. */
630 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
631 if (ret < 0) {
632 ERR("Exhausted number of available FD upon metadata stream create");
633 goto error;
634 }
852d0037 635 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
636 &ua_sess->metadata->stream_obj);
637 if (ret < 0) {
638 ERR("UST create metadata stream failed");
421cb601 639 goto error;
91d76f53 640 }
421cb601 641
421cb601 642error:
86acf0da 643 health_code_update(&health_thread_cmd);
5b4a0ec0 644 return ret;
91d76f53
DG
645}
646
b551a063 647/*
5b4a0ec0 648 * Create the specified channel onto the UST tracer for a UST session.
b551a063 649 */
5b4a0ec0
DG
650static int create_ust_channel(struct ust_app *app,
651 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 652{
5b4a0ec0 653 int ret;
b551a063 654
86acf0da
DG
655 health_code_update(&health_thread_cmd);
656
5b4a0ec0 657 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
658
659 /* We are going to receive 2 fds, we need to reserve them. */
660 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
661 if (ret < 0) {
662 ERR("Exhausted number of available FD upon create channel");
663 goto error;
664 }
86acf0da
DG
665
666 health_code_update(&health_thread_cmd);
667
852d0037 668 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
669 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
670 if (ret < 0) {
58f3ca76 671 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 672 "and session handle %d with ret %d",
852d0037 673 ua_chan->name, app->pid, app->sock,
5b4a0ec0 674 ua_sess->handle, ret);
4063050c 675 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
676 goto error;
677 }
678
5b4a0ec0 679 ua_chan->handle = ua_chan->obj->handle;
b551a063 680
5b4a0ec0 681 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 682 ua_chan->name, app->pid, app->sock);
b551a063 683
86acf0da
DG
684 health_code_update(&health_thread_cmd);
685
8535a6d9
DG
686 /* If channel is not enabled, disable it on the tracer */
687 if (!ua_chan->enabled) {
688 ret = disable_ust_channel(app, ua_sess, ua_chan);
689 if (ret < 0) {
690 goto error;
691 }
692 }
693
b551a063 694error:
86acf0da 695 health_code_update(&health_thread_cmd);
b551a063
DG
696 return ret;
697}
698
91d76f53 699/*
5b4a0ec0 700 * Create the specified event onto the UST tracer for a UST session.
91d76f53 701 */
edb67388
DG
702static
703int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
704 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 705{
5b4a0ec0 706 int ret = 0;
284d8f55 707
86acf0da
DG
708 health_code_update(&health_thread_cmd);
709
5b4a0ec0 710 /* Create UST event on tracer */
852d0037 711 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
712 &ua_event->obj);
713 if (ret < 0) {
a027b2d2 714 if (ret == -EEXIST || ret == -EPERM) {
fc34caaa
DG
715 ret = 0;
716 goto error;
717 }
5b4a0ec0 718 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 719 ua_event->attr.name, app->pid, ret);
5b4a0ec0 720 goto error;
91d76f53 721 }
f6a9efaa 722
5b4a0ec0 723 ua_event->handle = ua_event->obj->handle;
284d8f55 724
5b4a0ec0 725 DBG2("UST app event %s created successfully for pid:%d",
852d0037 726 ua_event->attr.name, app->pid);
f6a9efaa 727
86acf0da
DG
728 health_code_update(&health_thread_cmd);
729
8535a6d9 730 /* If event not enabled, disable it on the tracer */
fc34caaa 731 if (ua_event->enabled == 0) {
8535a6d9
DG
732 ret = disable_ust_event(app, ua_sess, ua_event);
733 if (ret < 0) {
fc34caaa
DG
734 /*
735 * If we hit an EPERM, something is wrong with our disable call. If
736 * we get an EEXIST, there is a problem on the tracer side since we
737 * just created it.
738 */
739 switch (ret) {
740 case -EPERM:
741 /* Code flow problem */
742 assert(0);
743 case -EEXIST:
744 /* It's OK for our use case. */
745 ret = 0;
746 break;
747 default:
748 break;
749 }
8535a6d9
DG
750 goto error;
751 }
752 }
753
5b4a0ec0 754error:
86acf0da 755 health_code_update(&health_thread_cmd);
5b4a0ec0 756 return ret;
91d76f53 757}
48842b30 758
5b4a0ec0
DG
759/*
760 * Copy data between an UST app event and a LTT event.
761 */
421cb601 762static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
763 struct ltt_ust_event *uevent)
764{
bec39940 765 struct lttng_ht_iter iter;
55cc08a6
DG
766 struct ltt_ust_context *uctx;
767 struct ust_app_ctx *ua_ctx;
768
48842b30
DG
769 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
770 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
771
fc34caaa
DG
772 ua_event->enabled = uevent->enabled;
773
5b4a0ec0
DG
774 /* Copy event attributes */
775 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
776
53a80697
MD
777 /* Copy filter bytecode */
778 if (uevent->filter) {
779 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
780 uevent->filter->len);
781 if (!ua_event->filter) {
782 return;
783 }
784 memcpy(ua_event->filter, uevent->filter,
785 sizeof(*ua_event->filter) + uevent->filter->len);
786 }
bec39940 787 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
788 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
789 if (ua_ctx == NULL) {
fc34caaa
DG
790 /* malloc() failed. We should simply stop */
791 return;
55cc08a6 792 }
fc34caaa 793
bec39940
DG
794 lttng_ht_node_init_ulong(&ua_ctx->node,
795 (unsigned long) ua_ctx->ctx.ctx);
796 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 797 }
48842b30
DG
798}
799
5b4a0ec0
DG
800/*
801 * Copy data between an UST app channel and a LTT channel.
802 */
421cb601 803static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
804 struct ltt_ust_channel *uchan)
805{
bec39940
DG
806 struct lttng_ht_iter iter;
807 struct lttng_ht_node_str *ua_event_node;
48842b30 808 struct ltt_ust_event *uevent;
55cc08a6 809 struct ltt_ust_context *uctx;
48842b30 810 struct ust_app_event *ua_event;
55cc08a6 811 struct ust_app_ctx *ua_ctx;
48842b30 812
fc34caaa 813 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
814
815 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
816 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
817 /* Copy event attributes */
818 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 819
fc34caaa
DG
820 ua_chan->enabled = uchan->enabled;
821
bec39940 822 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
823 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
824 if (ua_ctx == NULL) {
825 continue;
826 }
bec39940
DG
827 lttng_ht_node_init_ulong(&ua_ctx->node,
828 (unsigned long) ua_ctx->ctx.ctx);
829 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 830 }
48842b30 831
421cb601 832 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
833 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
834 struct lttng_ht_iter uiter;
ba767faf 835
bec39940
DG
836 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
837 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 838 if (ua_event_node == NULL) {
421cb601 839 DBG2("UST event %s not found on shadow copy channel",
48842b30 840 uevent->attr.name);
284d8f55 841 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 842 if (ua_event == NULL) {
5b4a0ec0 843 continue;
48842b30 844 }
421cb601 845 shadow_copy_event(ua_event, uevent);
bec39940 846 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 847 }
48842b30
DG
848 }
849
fc34caaa 850 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
851}
852
5b4a0ec0
DG
853/*
854 * Copy data between a UST app session and a regular LTT session.
855 */
421cb601 856static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 857 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 858{
bec39940
DG
859 struct lttng_ht_node_str *ua_chan_node;
860 struct lttng_ht_iter iter;
48842b30
DG
861 struct ltt_ust_channel *uchan;
862 struct ust_app_channel *ua_chan;
477d7741
MD
863 time_t rawtime;
864 struct tm *timeinfo;
865 char datetime[16];
866 int ret;
867
868 /* Get date and time for unique app path */
869 time(&rawtime);
870 timeinfo = localtime(&rawtime);
871 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 872
421cb601 873 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 874
a991f516 875 ua_sess->id = usess->id;
6df2e2c9
MD
876 ua_sess->uid = usess->uid;
877 ua_sess->gid = usess->gid;
48842b30 878
00e2e675
DG
879 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
880 datetime);
477d7741
MD
881 if (ret < 0) {
882 PERROR("asprintf UST shadow copy session");
883 /* TODO: We cannot return an error from here.. */
884 assert(0);
885 }
886
48842b30
DG
887 /* TODO: support all UST domain */
888
889 /* Iterate over all channels in global domain. */
bec39940
DG
890 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
891 uchan, node.node) {
892 struct lttng_ht_iter uiter;
ba767faf 893
bec39940
DG
894 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
895 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 896 if (ua_chan_node != NULL) {
fc34caaa 897 /* Session exist. Contiuing. */
5b4a0ec0
DG
898 continue;
899 }
421cb601 900
5b4a0ec0
DG
901 DBG2("Channel %s not found on shadow session copy, creating it",
902 uchan->name);
903 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
904 if (ua_chan == NULL) {
fc34caaa 905 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 906 continue;
48842b30
DG
907 }
908
5b4a0ec0 909 shadow_copy_channel(ua_chan, uchan);
bec39940 910 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
911 }
912}
913
78f0bacd
DG
914/*
915 * Lookup sesison wrapper.
916 */
84cd17c6
MD
917static
918void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 919 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
920{
921 /* Get right UST app session from app */
2c348c10 922 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
923}
924
421cb601
DG
925/*
926 * Return ust app session from the app session hashtable using the UST session
a991f516 927 * id.
421cb601 928 */
48842b30
DG
929static struct ust_app_session *lookup_session_by_app(
930 struct ltt_ust_session *usess, struct ust_app *app)
931{
bec39940
DG
932 struct lttng_ht_iter iter;
933 struct lttng_ht_node_ulong *node;
48842b30 934
84cd17c6 935 __lookup_session_by_app(usess, app, &iter);
bec39940 936 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
937 if (node == NULL) {
938 goto error;
939 }
940
941 return caa_container_of(node, struct ust_app_session, node);
942
943error:
944 return NULL;
945}
946
421cb601
DG
947/*
948 * Create a UST session onto the tracer of app and add it the session
949 * hashtable.
950 *
951 * Return ust app session or NULL on error.
952 */
953static struct ust_app_session *create_ust_app_session(
954 struct ltt_ust_session *usess, struct ust_app *app)
955{
956 int ret;
957 struct ust_app_session *ua_sess;
958
86acf0da
DG
959 health_code_update(&health_thread_cmd);
960
421cb601
DG
961 ua_sess = lookup_session_by_app(usess, app);
962 if (ua_sess == NULL) {
a991f516 963 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 964 app->pid, usess->id);
421cb601
DG
965 ua_sess = alloc_ust_app_session();
966 if (ua_sess == NULL) {
967 /* Only malloc can failed so something is really wrong */
fc34caaa 968 goto end;
421cb601 969 }
477d7741 970 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
971 }
972
86acf0da
DG
973 health_code_update(&health_thread_cmd);
974
421cb601 975 if (ua_sess->handle == -1) {
852d0037 976 ret = ustctl_create_session(app->sock);
421cb601 977 if (ret < 0) {
852d0037 978 ERR("Creating session for app pid %d", app->pid);
0f83395d 979 delete_ust_app_session(-1, ua_sess);
915d047c
DG
980 /* This means that the tracer is gone... */
981 ua_sess = (void*) -1UL;
0f83395d 982 goto end;
421cb601
DG
983 }
984
421cb601
DG
985 ua_sess->handle = ret;
986
987 /* Add ust app session to app's HT */
2c348c10 988 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 989 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
990
991 DBG2("UST app session created successfully with handle %d", ret);
992 }
993
fc34caaa 994end:
86acf0da 995 health_code_update(&health_thread_cmd);
421cb601 996 return ua_sess;
421cb601
DG
997}
998
55cc08a6
DG
999/*
1000 * Create a context for the channel on the tracer.
1001 */
1002static
1003int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1004 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1005 struct ust_app *app)
1006{
1007 int ret = 0;
bec39940
DG
1008 struct lttng_ht_iter iter;
1009 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1010 struct ust_app_ctx *ua_ctx;
1011
1012 DBG2("UST app adding context to channel %s", ua_chan->name);
1013
bec39940
DG
1014 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1015 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1016 if (node != NULL) {
1017 ret = -EEXIST;
1018 goto error;
1019 }
1020
1021 ua_ctx = alloc_ust_app_ctx(uctx);
1022 if (ua_ctx == NULL) {
1023 /* malloc failed */
1024 ret = -1;
1025 goto error;
1026 }
1027
bec39940
DG
1028 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1029 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1030
1031 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1032 if (ret < 0) {
1033 goto error;
1034 }
1035
1036error:
1037 return ret;
1038}
1039
1040/*
1041 * Create an UST context and enable it for the event on the tracer.
1042 */
1043static
1044int create_ust_app_event_context(struct ust_app_session *ua_sess,
1045 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1046 struct ust_app *app)
1047{
1048 int ret = 0;
bec39940
DG
1049 struct lttng_ht_iter iter;
1050 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1051 struct ust_app_ctx *ua_ctx;
1052
1053 DBG2("UST app adding context to event %s", ua_event->name);
1054
bec39940
DG
1055 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1056 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1057 if (node != NULL) {
1058 ret = -EEXIST;
1059 goto error;
1060 }
1061
1062 ua_ctx = alloc_ust_app_ctx(uctx);
1063 if (ua_ctx == NULL) {
1064 /* malloc failed */
1065 ret = -1;
1066 goto error;
1067 }
1068
bec39940
DG
1069 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1070 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
1071
1072 ret = create_ust_event_context(ua_event, ua_ctx, app);
1073 if (ret < 0) {
1074 goto error;
1075 }
1076
1077error:
1078 return ret;
1079}
1080
53a80697
MD
1081/*
1082 * Set UST filter for the event on the tracer.
1083 */
1084static
1085int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1086 struct ust_app_event *ua_event,
1087 struct lttng_filter_bytecode *bytecode,
1088 struct ust_app *app)
1089{
1090 int ret = 0;
1091
1092 DBG2("UST app adding context to event %s", ua_event->name);
1093
1094 /* Copy filter bytecode */
1095 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1096 if (!ua_event->filter) {
1097 return -ENOMEM;
1098 }
1099 memcpy(ua_event->filter, bytecode,
1100 sizeof(*ua_event->filter) + bytecode->len);
1101 ret = set_ust_event_filter(ua_event, app);
1102 if (ret < 0) {
1103 goto error;
1104 }
1105
1106error:
1107 return ret;
1108}
1109
edb67388
DG
1110/*
1111 * Enable on the tracer side a ust app event for the session and channel.
1112 */
1113static
1114int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1115 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1116{
1117 int ret;
1118
1119 ret = enable_ust_event(app, ua_sess, ua_event);
1120 if (ret < 0) {
1121 goto error;
1122 }
1123
1124 ua_event->enabled = 1;
1125
1126error:
1127 return ret;
1128}
1129
9730260e
DG
1130/*
1131 * Disable on the tracer side a ust app event for the session and channel.
1132 */
1133static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1134 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1135{
1136 int ret;
1137
1138 ret = disable_ust_event(app, ua_sess, ua_event);
1139 if (ret < 0) {
1140 goto error;
1141 }
1142
1143 ua_event->enabled = 0;
1144
1145error:
1146 return ret;
1147}
1148
78f0bacd
DG
1149/*
1150 * Lookup ust app channel for session and disable it on the tracer side.
1151 */
8535a6d9
DG
1152static
1153int disable_ust_app_channel(struct ust_app_session *ua_sess,
1154 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1155{
8535a6d9 1156 int ret;
78f0bacd
DG
1157
1158 ret = disable_ust_channel(app, ua_sess, ua_chan);
1159 if (ret < 0) {
1160 goto error;
1161 }
1162
8535a6d9
DG
1163 ua_chan->enabled = 0;
1164
78f0bacd
DG
1165error:
1166 return ret;
1167}
1168
1169/*
1170 * Lookup ust app channel for session and enable it on the tracer side.
1171 */
1172static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1173 struct ltt_ust_channel *uchan, struct ust_app *app)
1174{
1175 int ret = 0;
bec39940
DG
1176 struct lttng_ht_iter iter;
1177 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1178 struct ust_app_channel *ua_chan;
1179
bec39940
DG
1180 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1181 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1182 if (ua_chan_node == NULL) {
a991f516
MD
1183 DBG2("Unable to find channel %s in ust session id %u",
1184 uchan->name, ua_sess->id);
78f0bacd
DG
1185 goto error;
1186 }
1187
1188 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1189
1190 ret = enable_ust_channel(app, ua_sess, ua_chan);
1191 if (ret < 0) {
1192 goto error;
1193 }
1194
1195error:
1196 return ret;
1197}
1198
284d8f55 1199/*
5b4a0ec0 1200 * Create UST app channel and create it on the tracer.
284d8f55 1201 */
5b4a0ec0
DG
1202static struct ust_app_channel *create_ust_app_channel(
1203 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1204 struct ust_app *app)
1205{
1206 int ret = 0;
bec39940
DG
1207 struct lttng_ht_iter iter;
1208 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1209 struct ust_app_channel *ua_chan;
1210
1211 /* Lookup channel in the ust app session */
bec39940
DG
1212 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1213 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1214 if (ua_chan_node != NULL) {
5b4a0ec0 1215 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1216 goto end;
5b4a0ec0
DG
1217 }
1218
fc34caaa
DG
1219 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1220 if (ua_chan == NULL) {
1221 /* Only malloc can fail here */
1222 goto error;
1223 }
1224 shadow_copy_channel(ua_chan, uchan);
1225
5b4a0ec0
DG
1226 ret = create_ust_channel(app, ua_sess, ua_chan);
1227 if (ret < 0) {
fc34caaa
DG
1228 /* Not found previously means that it does not exist on the tracer */
1229 assert(ret != -EEXIST);
5b4a0ec0
DG
1230 goto error;
1231 }
1232
58f3ca76
DG
1233 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1234
fc34caaa 1235 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1236 app->pid);
fc34caaa
DG
1237
1238end:
5b4a0ec0
DG
1239 return ua_chan;
1240
1241error:
fc34caaa 1242 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1243 return NULL;
1244}
1245
1246/*
1247 * Create UST app event and create it on the tracer side.
1248 */
edb67388
DG
1249static
1250int create_ust_app_event(struct ust_app_session *ua_sess,
1251 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1252 struct ust_app *app)
284d8f55 1253{
edb67388 1254 int ret = 0;
bec39940
DG
1255 struct lttng_ht_iter iter;
1256 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1257 struct ust_app_event *ua_event;
284d8f55 1258
5b4a0ec0 1259 /* Get event node */
bec39940
DG
1260 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1261 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1262 if (ua_event_node != NULL) {
fc34caaa 1263 ret = -EEXIST;
edb67388
DG
1264 goto end;
1265 }
5b4a0ec0 1266
edb67388
DG
1267 /* Does not exist so create one */
1268 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1269 if (ua_event == NULL) {
1270 /* Only malloc can failed so something is really wrong */
1271 ret = -ENOMEM;
fc34caaa 1272 goto end;
5b4a0ec0 1273 }
edb67388 1274 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1275
edb67388 1276 /* Create it on the tracer side */
5b4a0ec0 1277 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1278 if (ret < 0) {
fc34caaa
DG
1279 /* Not found previously means that it does not exist on the tracer */
1280 assert(ret != -EEXIST);
284d8f55
DG
1281 goto error;
1282 }
1283
bec39940 1284 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1285
fc34caaa 1286 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1287 app->pid);
7f79d3a1 1288
edb67388 1289end:
fc34caaa
DG
1290 return ret;
1291
5b4a0ec0 1292error:
fc34caaa
DG
1293 /* Valid. Calling here is already in a read side lock */
1294 delete_ust_app_event(-1, ua_event);
edb67388 1295 return ret;
5b4a0ec0
DG
1296}
1297
1298/*
1299 * Create UST metadata and open it on the tracer side.
1300 */
1301static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1302 char *pathname, struct ust_app *app)
1303{
1304 int ret = 0;
1305
1306 if (ua_sess->metadata == NULL) {
1307 /* Allocate UST metadata */
1308 ua_sess->metadata = trace_ust_create_metadata(pathname);
1309 if (ua_sess->metadata == NULL) {
fc34caaa 1310 /* malloc() failed */
5b4a0ec0
DG
1311 goto error;
1312 }
1313
1314 ret = open_ust_metadata(app, ua_sess);
1315 if (ret < 0) {
7db205b5
DG
1316 DBG3("Opening metadata failed. Cleaning up memory");
1317
fc34caaa
DG
1318 /* Cleanup failed metadata struct */
1319 free(ua_sess->metadata);
7db205b5
DG
1320 /*
1321 * This is very important because delete_ust_app_session check if
1322 * the pointer is null or not in order to delete the metadata.
1323 */
1324 ua_sess->metadata = NULL;
5b4a0ec0
DG
1325 goto error;
1326 }
1327
852d0037 1328 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1329 }
1330
1331 /* Open UST metadata stream */
1332 if (ua_sess->metadata->stream_obj == NULL) {
1333 ret = create_ust_stream(app, ua_sess);
1334 if (ret < 0) {
1335 goto error;
1336 }
1337
477d7741
MD
1338 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1339 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1340 if (ret < 0) {
1341 PERROR("asprintf UST create stream");
1342 goto error;
1343 }
1344
1345 DBG2("UST metadata stream object created for app pid %d",
852d0037 1346 app->pid);
5b4a0ec0
DG
1347 } else {
1348 ERR("Attempting to create stream without metadata opened");
1349 goto error;
1350 }
1351
1352 return 0;
1353
1354error:
1355 return -1;
1356}
1357
1358/*
1359 * Return pointer to traceable apps list.
1360 */
bec39940 1361struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1362{
1363 return ust_app_ht;
1364}
1365
1366/*
1367 * Return ust app pointer or NULL if not found.
1368 */
1369struct ust_app *ust_app_find_by_pid(pid_t pid)
1370{
bec39940
DG
1371 struct lttng_ht_node_ulong *node;
1372 struct lttng_ht_iter iter;
5b4a0ec0
DG
1373
1374 rcu_read_lock();
bec39940
DG
1375 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1376 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1377 if (node == NULL) {
1378 DBG2("UST app no found with pid %d", pid);
1379 goto error;
1380 }
1381 rcu_read_unlock();
1382
1383 DBG2("Found UST app by pid %d", pid);
1384
852d0037 1385 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1386
1387error:
1388 rcu_read_unlock();
1389 return NULL;
1390}
1391
1392/*
1393 * Using pid and uid (of the app), allocate a new ust_app struct and
1394 * add it to the global traceable app list.
1395 *
0df502fd
MD
1396 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1397 * bitness is not supported.
5b4a0ec0
DG
1398 */
1399int ust_app_register(struct ust_register_msg *msg, int sock)
1400{
1401 struct ust_app *lta;
799e2c4f 1402 int ret;
5b4a0ec0 1403
173af62f
DG
1404 if ((msg->bits_per_long == 64 &&
1405 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1406 || (msg->bits_per_long == 32 &&
1407 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1408 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1409 "%d-bit long, but no consumerd for this long size is available.\n",
1410 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1411 ret = close(sock);
1412 if (ret) {
1413 PERROR("close");
1414 }
4063050c 1415 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1416 return -EINVAL;
1417 }
3f2c5fcc
MD
1418 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1419 ERR("Registration failed: application \"%s\" (pid: %d) has "
1420 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1421 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1422 ret = close(sock);
1423 if (ret) {
1424 PERROR("close");
1425 }
4063050c 1426 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1427 return -EINVAL;
1428 }
5b4a0ec0
DG
1429 lta = zmalloc(sizeof(struct ust_app));
1430 if (lta == NULL) {
1431 PERROR("malloc");
1432 return -ENOMEM;
1433 }
1434
1435 lta->ppid = msg->ppid;
1436 lta->uid = msg->uid;
1437 lta->gid = msg->gid;
e0c7ec2b 1438 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1439 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1440 lta->v_major = msg->major;
1441 lta->v_minor = msg->minor;
1442 strncpy(lta->name, msg->name, sizeof(lta->name));
1443 lta->name[16] = '\0';
bec39940 1444 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1445
852d0037
DG
1446 lta->pid = msg->pid;
1447 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1448 lta->sock = sock;
1449 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1450
1451 rcu_read_lock();
852d0037
DG
1452
1453 /*
1454 * On a re-registration, we want to kick out the previous registration of
1455 * that pid
1456 */
1457 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1458
1459 /*
1460 * The socket _should_ be unique until _we_ call close. So, a add_unique
1461 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1462 * already in the table.
1463 */
1464 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1465
5b4a0ec0
DG
1466 rcu_read_unlock();
1467
1468 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1469 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1470 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1471
1472 return 0;
1473}
1474
1475/*
1476 * Unregister app by removing it from the global traceable app list and freeing
1477 * the data struct.
1478 *
1479 * The socket is already closed at this point so no close to sock.
1480 */
1481void ust_app_unregister(int sock)
1482{
1483 struct ust_app *lta;
bec39940
DG
1484 struct lttng_ht_node_ulong *node;
1485 struct lttng_ht_iter iter;
525b0740 1486 int ret;
5b4a0ec0
DG
1487
1488 rcu_read_lock();
886459c6 1489
5b4a0ec0 1490 /* Get the node reference for a call_rcu */
852d0037 1491 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1492 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1493 if (node == NULL) {
852d0037 1494 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1495 goto error;
1496 }
284d8f55 1497
852d0037
DG
1498 lta = caa_container_of(node, struct ust_app, sock_n);
1499
1500 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1501
886459c6 1502 /* Remove application from PID hash table */
852d0037
DG
1503 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1504 assert(!ret);
1505
1506 /* Assign second node for deletion */
1507 iter.iter.node = &lta->pid_n.node;
1508
bec39940 1509 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1510 assert(!ret);
852d0037
DG
1511
1512 /* Free memory */
1513 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1514
284d8f55 1515error:
5b4a0ec0
DG
1516 rcu_read_unlock();
1517 return;
284d8f55
DG
1518}
1519
1520/*
5b4a0ec0 1521 * Return traceable_app_count
284d8f55 1522 */
5b4a0ec0 1523unsigned long ust_app_list_count(void)
284d8f55 1524{
5b4a0ec0 1525 unsigned long count;
284d8f55 1526
5b4a0ec0 1527 rcu_read_lock();
bec39940 1528 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1529 rcu_read_unlock();
284d8f55 1530
5b4a0ec0 1531 return count;
284d8f55
DG
1532}
1533
5b4a0ec0
DG
1534/*
1535 * Fill events array with all events name of all registered apps.
1536 */
1537int ust_app_list_events(struct lttng_event **events)
421cb601 1538{
5b4a0ec0
DG
1539 int ret, handle;
1540 size_t nbmem, count = 0;
bec39940 1541 struct lttng_ht_iter iter;
5b4a0ec0
DG
1542 struct ust_app *app;
1543 struct lttng_event *tmp;
421cb601 1544
5b4a0ec0
DG
1545 nbmem = UST_APP_EVENT_LIST_SIZE;
1546 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1547 if (tmp == NULL) {
1548 PERROR("zmalloc ust app events");
1549 ret = -ENOMEM;
421cb601
DG
1550 goto error;
1551 }
1552
5b4a0ec0 1553 rcu_read_lock();
421cb601 1554
852d0037 1555 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1556 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1557
86acf0da
DG
1558 health_code_update(&health_thread_cmd);
1559
e0c7ec2b
DG
1560 if (!app->compatible) {
1561 /*
1562 * TODO: In time, we should notice the caller of this error by
1563 * telling him that this is a version error.
1564 */
1565 continue;
1566 }
852d0037 1567 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1568 if (handle < 0) {
1569 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1570 app->pid);
5b4a0ec0
DG
1571 continue;
1572 }
421cb601 1573
852d0037 1574 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1575 &uiter)) != -ENOENT) {
86acf0da 1576 health_code_update(&health_thread_cmd);
815564d8 1577 if (count >= nbmem) {
d7b3776f
DG
1578 /* In case the realloc fails, we free the memory */
1579 void *tmp_ptr = (void *) tmp;
815564d8
MD
1580 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1581 2 * nbmem);
1582 nbmem *= 2;
2f221590 1583 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1584 if (tmp == NULL) {
1585 PERROR("realloc ust app events");
d7b3776f 1586 free(tmp_ptr);
5b4a0ec0
DG
1587 ret = -ENOMEM;
1588 goto rcu_error;
1589 }
1590 }
90eaa0d2 1591 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1592 tmp[count].loglevel = uiter.loglevel;
6775595e 1593 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1594 tmp[count].pid = app->pid;
5b4a0ec0
DG
1595 tmp[count].enabled = -1;
1596 count++;
421cb601 1597 }
421cb601
DG
1598 }
1599
5b4a0ec0
DG
1600 ret = count;
1601 *events = tmp;
421cb601 1602
5b4a0ec0 1603 DBG2("UST app list events done (%zu events)", count);
421cb601 1604
5b4a0ec0
DG
1605rcu_error:
1606 rcu_read_unlock();
421cb601 1607error:
86acf0da 1608 health_code_update(&health_thread_cmd);
5b4a0ec0 1609 return ret;
421cb601
DG
1610}
1611
f37d259d
MD
1612/*
1613 * Fill events array with all events name of all registered apps.
1614 */
1615int ust_app_list_event_fields(struct lttng_event_field **fields)
1616{
1617 int ret, handle;
1618 size_t nbmem, count = 0;
1619 struct lttng_ht_iter iter;
1620 struct ust_app *app;
1621 struct lttng_event_field *tmp;
1622
1623 nbmem = UST_APP_EVENT_LIST_SIZE;
1624 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1625 if (tmp == NULL) {
1626 PERROR("zmalloc ust app event fields");
1627 ret = -ENOMEM;
1628 goto error;
1629 }
1630
1631 rcu_read_lock();
1632
1633 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1634 struct lttng_ust_field_iter uiter;
1635
86acf0da
DG
1636 health_code_update(&health_thread_cmd);
1637
f37d259d
MD
1638 if (!app->compatible) {
1639 /*
1640 * TODO: In time, we should notice the caller of this error by
1641 * telling him that this is a version error.
1642 */
1643 continue;
1644 }
1645 handle = ustctl_tracepoint_field_list(app->sock);
1646 if (handle < 0) {
1647 ERR("UST app list event fields getting handle failed for app pid %d",
1648 app->pid);
1649 continue;
1650 }
1651
1652 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1653 &uiter)) != -ENOENT) {
86acf0da 1654 health_code_update(&health_thread_cmd);
f37d259d 1655 if (count >= nbmem) {
d7b3776f
DG
1656 /* In case the realloc fails, we free the memory */
1657 void *tmp_ptr = (void *) tmp;
f37d259d
MD
1658 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1659 2 * nbmem);
1660 nbmem *= 2;
1661 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1662 if (tmp == NULL) {
1663 PERROR("realloc ust app event fields");
d7b3776f 1664 free(tmp_ptr);
f37d259d
MD
1665 ret = -ENOMEM;
1666 goto rcu_error;
1667 }
1668 }
f37d259d
MD
1669
1670 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1671 tmp[count].type = uiter.type;
590b9e3c 1672 tmp[count].nowrite = uiter.nowrite;
f37d259d
MD
1673
1674 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1675 tmp[count].event.loglevel = uiter.loglevel;
1676 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1677 tmp[count].event.pid = app->pid;
1678 tmp[count].event.enabled = -1;
1679 count++;
1680 }
1681 }
1682
1683 ret = count;
1684 *fields = tmp;
1685
1686 DBG2("UST app list event fields done (%zu events)", count);
1687
1688rcu_error:
1689 rcu_read_unlock();
1690error:
86acf0da 1691 health_code_update(&health_thread_cmd);
f37d259d
MD
1692 return ret;
1693}
1694
5b4a0ec0
DG
1695/*
1696 * Free and clean all traceable apps of the global list.
1697 */
1698void ust_app_clean_list(void)
421cb601 1699{
5b4a0ec0 1700 int ret;
659ed79f 1701 struct ust_app *app;
bec39940 1702 struct lttng_ht_iter iter;
421cb601 1703
5b4a0ec0 1704 DBG2("UST app cleaning registered apps hash table");
421cb601 1705
5b4a0ec0 1706 rcu_read_lock();
421cb601 1707
659ed79f 1708 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1709 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1710 assert(!ret);
659ed79f 1711 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1712 }
1713
852d0037 1714 /* Cleanup socket hash table */
659ed79f
DG
1715 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1716 sock_n.node) {
852d0037 1717 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1718 assert(!ret);
1719 }
852d0037 1720
bec39940 1721 /* Destroy is done only when the ht is empty */
852d0037
DG
1722 lttng_ht_destroy(ust_app_ht);
1723 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1724
5b4a0ec0
DG
1725 rcu_read_unlock();
1726}
1727
1728/*
1729 * Init UST app hash table.
1730 */
1731void ust_app_ht_alloc(void)
1732{
bec39940 1733 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1734 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1735}
1736
78f0bacd
DG
1737/*
1738 * For a specific UST session, disable the channel for all registered apps.
1739 */
35a9059d 1740int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1741 struct ltt_ust_channel *uchan)
1742{
1743 int ret = 0;
bec39940
DG
1744 struct lttng_ht_iter iter;
1745 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1746 struct ust_app *app;
1747 struct ust_app_session *ua_sess;
8535a6d9 1748 struct ust_app_channel *ua_chan;
78f0bacd
DG
1749
1750 if (usess == NULL || uchan == NULL) {
1751 ERR("Disabling UST global channel with NULL values");
1752 ret = -1;
1753 goto error;
1754 }
1755
a991f516
MD
1756 DBG2("UST app disabling channel %s from global domain for session id %d",
1757 uchan->name, usess->id);
78f0bacd
DG
1758
1759 rcu_read_lock();
1760
1761 /* For every registered applications */
852d0037 1762 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1763 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1764 if (!app->compatible) {
1765 /*
1766 * TODO: In time, we should notice the caller of this error by
1767 * telling him that this is a version error.
1768 */
1769 continue;
1770 }
78f0bacd
DG
1771 ua_sess = lookup_session_by_app(usess, app);
1772 if (ua_sess == NULL) {
1773 continue;
1774 }
1775
8535a6d9 1776 /* Get channel */
bec39940
DG
1777 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1778 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1779 /* If the session if found for the app, the channel must be there */
1780 assert(ua_chan_node);
1781
1782 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1783 /* The channel must not be already disabled */
1784 assert(ua_chan->enabled == 1);
1785
1786 /* Disable channel onto application */
1787 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1788 if (ret < 0) {
1789 /* XXX: We might want to report this error at some point... */
1790 continue;
1791 }
1792 }
1793
1794 rcu_read_unlock();
1795
1796error:
1797 return ret;
1798}
1799
1800/*
1801 * For a specific UST session, enable the channel for all registered apps.
1802 */
35a9059d 1803int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1804 struct ltt_ust_channel *uchan)
1805{
1806 int ret = 0;
bec39940 1807 struct lttng_ht_iter iter;
78f0bacd
DG
1808 struct ust_app *app;
1809 struct ust_app_session *ua_sess;
1810
1811 if (usess == NULL || uchan == NULL) {
1812 ERR("Adding UST global channel to NULL values");
1813 ret = -1;
1814 goto error;
1815 }
1816
a991f516
MD
1817 DBG2("UST app enabling channel %s to global domain for session id %d",
1818 uchan->name, usess->id);
78f0bacd
DG
1819
1820 rcu_read_lock();
1821
1822 /* For every registered applications */
852d0037 1823 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1824 if (!app->compatible) {
1825 /*
1826 * TODO: In time, we should notice the caller of this error by
1827 * telling him that this is a version error.
1828 */
1829 continue;
1830 }
78f0bacd
DG
1831 ua_sess = lookup_session_by_app(usess, app);
1832 if (ua_sess == NULL) {
1833 continue;
1834 }
1835
1836 /* Enable channel onto application */
1837 ret = enable_ust_app_channel(ua_sess, uchan, app);
1838 if (ret < 0) {
1839 /* XXX: We might want to report this error at some point... */
1840 continue;
1841 }
1842 }
1843
1844 rcu_read_unlock();
1845
1846error:
1847 return ret;
1848}
1849
b0a40d28
DG
1850/*
1851 * Disable an event in a channel and for a specific session.
1852 */
35a9059d
DG
1853int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1854 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1855{
1856 int ret = 0;
bec39940
DG
1857 struct lttng_ht_iter iter, uiter;
1858 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1859 struct ust_app *app;
1860 struct ust_app_session *ua_sess;
1861 struct ust_app_channel *ua_chan;
1862 struct ust_app_event *ua_event;
1863
1864 DBG("UST app disabling event %s for all apps in channel "
a991f516 1865 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1866
1867 rcu_read_lock();
1868
1869 /* For all registered applications */
852d0037 1870 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1871 if (!app->compatible) {
1872 /*
1873 * TODO: In time, we should notice the caller of this error by
1874 * telling him that this is a version error.
1875 */
1876 continue;
1877 }
b0a40d28
DG
1878 ua_sess = lookup_session_by_app(usess, app);
1879 if (ua_sess == NULL) {
1880 /* Next app */
1881 continue;
1882 }
1883
1884 /* Lookup channel in the ust app session */
bec39940
DG
1885 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1886 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1887 if (ua_chan_node == NULL) {
a991f516 1888 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1889 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1890 continue;
1891 }
1892 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1893
bec39940
DG
1894 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1895 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1896 if (ua_event_node == NULL) {
1897 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1898 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1899 continue;
1900 }
1901 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1902
7f79d3a1 1903 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1904 if (ret < 0) {
1905 /* XXX: Report error someday... */
1906 continue;
1907 }
1908 }
1909
1910 rcu_read_unlock();
1911
1912 return ret;
1913}
1914
9730260e 1915/*
edb67388 1916 * For a specific UST session and UST channel, the event for all
9730260e
DG
1917 * registered apps.
1918 */
35a9059d 1919int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1920 struct ltt_ust_channel *uchan)
1921{
1922 int ret = 0;
bec39940
DG
1923 struct lttng_ht_iter iter, uiter;
1924 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1925 struct ust_app *app;
1926 struct ust_app_session *ua_sess;
1927 struct ust_app_channel *ua_chan;
1928 struct ust_app_event *ua_event;
1929
1930 DBG("UST app disabling all event for all apps in channel "
a991f516 1931 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1932
1933 rcu_read_lock();
1934
1935 /* For all registered applications */
852d0037 1936 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1937 if (!app->compatible) {
1938 /*
1939 * TODO: In time, we should notice the caller of this error by
1940 * telling him that this is a version error.
1941 */
1942 continue;
1943 }
9730260e 1944 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1945 /* If ua_sess is NULL, there is a code flow error */
1946 assert(ua_sess);
9730260e
DG
1947
1948 /* Lookup channel in the ust app session */
bec39940
DG
1949 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1950 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1951 /* If the channel is not found, there is a code flow error */
1952 assert(ua_chan_node);
1953
9730260e
DG
1954 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1955
1956 /* Disable each events of channel */
bec39940
DG
1957 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1958 node.node) {
7f79d3a1 1959 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1960 if (ret < 0) {
1961 /* XXX: Report error someday... */
1962 continue;
1963 }
1964 }
1965 }
1966
1967 rcu_read_unlock();
1968
1969 return ret;
1970}
1971
421cb601 1972/*
5b4a0ec0 1973 * For a specific UST session, create the channel for all registered apps.
421cb601 1974 */
35a9059d 1975int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1976 struct ltt_ust_channel *uchan)
1977{
bec39940 1978 struct lttng_ht_iter iter;
48842b30
DG
1979 struct ust_app *app;
1980 struct ust_app_session *ua_sess;
1981 struct ust_app_channel *ua_chan;
1982
fc34caaa
DG
1983 /* Very wrong code flow */
1984 assert(usess);
1985 assert(uchan);
421cb601 1986
a991f516
MD
1987 DBG2("UST app adding channel %s to global domain for session id %d",
1988 uchan->name, usess->id);
48842b30
DG
1989
1990 rcu_read_lock();
421cb601 1991
5b4a0ec0 1992 /* For every registered applications */
852d0037 1993 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1994 if (!app->compatible) {
1995 /*
1996 * TODO: In time, we should notice the caller of this error by
1997 * telling him that this is a version error.
1998 */
1999 continue;
2000 }
edb67388
DG
2001 /*
2002 * Create session on the tracer side and add it to app session HT. Note
2003 * that if session exist, it will simply return a pointer to the ust
2004 * app session.
2005 */
421cb601 2006 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2007 if (ua_sess == NULL) {
915d047c 2008 /* The malloc() failed. */
fc34caaa 2009 goto error;
915d047c
DG
2010 } else if (ua_sess == (void *) -1UL) {
2011 /* The application's socket is not valid. Contiuing */
2012 continue;
48842b30
DG
2013 }
2014
421cb601
DG
2015 /* Create channel onto application */
2016 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2017 if (ua_chan == NULL) {
fc34caaa
DG
2018 /* Major problem here and it's maybe the tracer or malloc() */
2019 goto error;
48842b30 2020 }
48842b30 2021 }
5b4a0ec0 2022
48842b30
DG
2023 rcu_read_unlock();
2024
fc34caaa
DG
2025 return 0;
2026
421cb601 2027error:
fc34caaa 2028 return -1;
48842b30
DG
2029}
2030
5b4a0ec0 2031/*
edb67388 2032 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2033 */
35a9059d 2034int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2035 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2036{
2037 int ret = 0;
bec39940
DG
2038 struct lttng_ht_iter iter, uiter;
2039 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
2040 struct ust_app *app;
2041 struct ust_app_session *ua_sess;
2042 struct ust_app_channel *ua_chan;
2043 struct ust_app_event *ua_event;
48842b30 2044
a991f516
MD
2045 DBG("UST app enabling event %s for all apps for session id %d",
2046 uevent->attr.name, usess->id);
48842b30 2047
edb67388
DG
2048 /*
2049 * NOTE: At this point, this function is called only if the session and
2050 * channel passed are already created for all apps. and enabled on the
2051 * tracer also.
2052 */
2053
48842b30 2054 rcu_read_lock();
421cb601
DG
2055
2056 /* For all registered applications */
852d0037 2057 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2058 if (!app->compatible) {
2059 /*
2060 * TODO: In time, we should notice the caller of this error by
2061 * telling him that this is a version error.
2062 */
2063 continue;
2064 }
edb67388
DG
2065 ua_sess = lookup_session_by_app(usess, app);
2066 /* If ua_sess is NULL, there is a code flow error */
2067 assert(ua_sess);
ba767faf 2068
edb67388 2069 /* Lookup channel in the ust app session */
bec39940
DG
2070 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2071 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2072 /* If the channel is not found, there is a code flow error */
2073 assert(ua_chan_node);
2074
2075 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2076
bec39940
DG
2077 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2078 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 2079 if (ua_event_node == NULL) {
7f79d3a1 2080 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2081 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2082 continue;
2083 }
2084 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2085
2086 ret = enable_ust_app_event(ua_sess, ua_event, app);
2087 if (ret < 0) {
7f79d3a1 2088 goto error;
48842b30 2089 }
edb67388
DG
2090 }
2091
7f79d3a1 2092error:
edb67388 2093 rcu_read_unlock();
edb67388
DG
2094 return ret;
2095}
2096
2097/*
2098 * For a specific existing UST session and UST channel, creates the event for
2099 * all registered apps.
2100 */
35a9059d 2101int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2102 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2103{
2104 int ret = 0;
bec39940
DG
2105 struct lttng_ht_iter iter, uiter;
2106 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2107 struct ust_app *app;
2108 struct ust_app_session *ua_sess;
2109 struct ust_app_channel *ua_chan;
2110
a991f516
MD
2111 DBG("UST app creating event %s for all apps for session id %d",
2112 uevent->attr.name, usess->id);
edb67388 2113
edb67388
DG
2114 rcu_read_lock();
2115
2116 /* For all registered applications */
852d0037 2117 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2118 if (!app->compatible) {
2119 /*
2120 * TODO: In time, we should notice the caller of this error by
2121 * telling him that this is a version error.
2122 */
2123 continue;
2124 }
edb67388
DG
2125 ua_sess = lookup_session_by_app(usess, app);
2126 /* If ua_sess is NULL, there is a code flow error */
2127 assert(ua_sess);
48842b30
DG
2128
2129 /* Lookup channel in the ust app session */
bec39940
DG
2130 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2131 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2132 /* If the channel is not found, there is a code flow error */
2133 assert(ua_chan_node);
2134
48842b30
DG
2135 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2136
edb67388
DG
2137 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2138 if (ret < 0) {
fc34caaa
DG
2139 if (ret != -EEXIST) {
2140 /* Possible value at this point: -ENOMEM. If so, we stop! */
2141 break;
2142 }
2143 DBG2("UST app event %s already exist on app PID %d",
852d0037 2144 uevent->attr.name, app->pid);
5b4a0ec0 2145 continue;
48842b30 2146 }
48842b30 2147 }
5b4a0ec0 2148
48842b30
DG
2149 rcu_read_unlock();
2150
2151 return ret;
2152}
2153
5b4a0ec0
DG
2154/*
2155 * Start tracing for a specific UST session and app.
2156 */
421cb601 2157int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2158{
2159 int ret = 0;
bec39940 2160 struct lttng_ht_iter iter;
48842b30
DG
2161 struct ust_app_session *ua_sess;
2162 struct ust_app_channel *ua_chan;
5b4a0ec0 2163 struct ltt_ust_stream *ustream;
173af62f 2164 struct consumer_socket *socket;
48842b30 2165
852d0037 2166 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2167
509cbaf8
MD
2168 rcu_read_lock();
2169
e0c7ec2b
DG
2170 if (!app->compatible) {
2171 goto end;
2172 }
2173
421cb601
DG
2174 ua_sess = lookup_session_by_app(usess, app);
2175 if (ua_sess == NULL) {
509cbaf8 2176 goto error_rcu_unlock;
421cb601 2177 }
48842b30 2178
aea829b3
DG
2179 /* Upon restart, we skip the setup, already done */
2180 if (ua_sess->started) {
8be98f9a 2181 goto skip_setup;
aea829b3 2182 }
8be98f9a 2183
a4b92340
DG
2184 /* Create directories if consumer is LOCAL and has a path defined. */
2185 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2186 strlen(usess->consumer->dst.trace_path) > 0) {
2187 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2188 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2189 if (ret < 0) {
2190 if (ret != -EEXIST) {
2191 ERR("Trace directory creation error");
2192 ret = -1;
2193 goto error_rcu_unlock;
2194 }
2195 }
2196 }
2197
f848c3eb
DG
2198 /* Indicate that the session has been started once */
2199 ua_sess->started = 1;
2200
421cb601
DG
2201 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2202 if (ret < 0) {
f73fabfd 2203 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2204 goto error_rcu_unlock;
421cb601 2205 }
48842b30 2206
421cb601 2207 /* For each channel */
bec39940
DG
2208 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2209 node.node) {
421cb601
DG
2210 /* Create all streams */
2211 while (1) {
5b4a0ec0 2212 /* Create UST stream */
421cb601
DG
2213 ustream = zmalloc(sizeof(*ustream));
2214 if (ustream == NULL) {
2215 PERROR("zmalloc ust stream");
509cbaf8 2216 goto error_rcu_unlock;
421cb601 2217 }
48842b30 2218
4063050c
MD
2219 /* We are going to receive 2 fds, we need to reserve them. */
2220 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2221 if (ret < 0) {
2222 ERR("Exhausted number of available FD upon stream create");
2223 free(ustream);
2224 goto error_rcu_unlock;
2225 }
86acf0da
DG
2226
2227 health_code_update(&health_thread_cmd);
2228
852d0037 2229 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2230 &ustream->obj);
48842b30 2231 if (ret < 0) {
421cb601 2232 /* Got all streams */
4063050c 2233 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2234 free(ustream);
f73fabfd 2235 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2236 break;
48842b30 2237 }
421cb601 2238 ustream->handle = ustream->obj->handle;
48842b30 2239
86acf0da
DG
2240 health_code_update(&health_thread_cmd);
2241
421cb601
DG
2242 /* Order is important */
2243 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2244 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2245 ua_chan->name, ua_chan->streams.count);
2246 ua_chan->streams.count++;
aba8e916
DG
2247 if (ret < 0) {
2248 PERROR("asprintf UST create stream");
a2c0da86
MD
2249 /*
2250 * XXX what should we do here with the
2251 * stream ?
2252 */
421cb601 2253 continue;
aba8e916 2254 }
00e2e675
DG
2255 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2256 ustream->handle);
421cb601 2257 }
86acf0da
DG
2258
2259 health_code_update(&health_thread_cmd);
421cb601 2260 }
aba8e916 2261
7753dea8
MD
2262 switch (app->bits_per_long) {
2263 case 64:
173af62f
DG
2264 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2265 usess->consumer);
2266 if (socket == NULL) {
2267 goto skip_setup;
2268 }
7753dea8
MD
2269 break;
2270 case 32:
173af62f
DG
2271 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2272 usess->consumer);
2273 if (socket == NULL) {
2274 goto skip_setup;
2275 }
7753dea8
MD
2276 break;
2277 default:
2278 ret = -EINVAL;
2279 goto error_rcu_unlock;
2280 }
aea829b3 2281
421cb601 2282 /* Setup UST consumer socket and send fds to it */
173af62f 2283 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2284 if (ret < 0) {
509cbaf8 2285 goto error_rcu_unlock;
421cb601 2286 }
48842b30 2287
86acf0da
DG
2288 health_code_update(&health_thread_cmd);
2289
8be98f9a 2290skip_setup:
421cb601 2291 /* This start the UST tracing */
852d0037 2292 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2293 if (ret < 0) {
852d0037 2294 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2295 goto error_rcu_unlock;
421cb601 2296 }
5b4a0ec0 2297
86acf0da
DG
2298 health_code_update(&health_thread_cmd);
2299
421cb601 2300 /* Quiescent wait after starting trace */
852d0037 2301 ustctl_wait_quiescent(app->sock);
48842b30 2302
e0c7ec2b
DG
2303end:
2304 rcu_read_unlock();
86acf0da 2305 health_code_update(&health_thread_cmd);
421cb601 2306 return 0;
48842b30 2307
509cbaf8
MD
2308error_rcu_unlock:
2309 rcu_read_unlock();
86acf0da 2310 health_code_update(&health_thread_cmd);
421cb601
DG
2311 return -1;
2312}
48842b30 2313
8be98f9a
MD
2314/*
2315 * Stop tracing for a specific UST session and app.
2316 */
2317int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2318{
2319 int ret = 0;
bec39940 2320 struct lttng_ht_iter iter;
8be98f9a 2321 struct ust_app_session *ua_sess;
6d3686da 2322 struct ust_app_channel *ua_chan;
8be98f9a 2323
852d0037 2324 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2325
2326 rcu_read_lock();
2327
e0c7ec2b
DG
2328 if (!app->compatible) {
2329 goto end;
2330 }
2331
8be98f9a
MD
2332 ua_sess = lookup_session_by_app(usess, app);
2333 if (ua_sess == NULL) {
2334 /* Only malloc can failed so something is really wrong */
2335 goto error_rcu_unlock;
2336 }
2337
9bc07046
DG
2338 /*
2339 * If started = 0, it means that stop trace has been called for a session
2340 * that was never started. This is a code flow error and should never
2341 * happen.
2342 */
2343 assert(ua_sess->started == 1);
7db205b5 2344
86acf0da
DG
2345 health_code_update(&health_thread_cmd);
2346
9d6c7d3f 2347 /* This inhibits UST tracing */
852d0037 2348 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2349 if (ret < 0) {
852d0037 2350 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2351 goto error_rcu_unlock;
2352 }
2353
86acf0da
DG
2354 health_code_update(&health_thread_cmd);
2355
9d6c7d3f 2356 /* Quiescent wait after stopping trace */
852d0037 2357 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2358
86acf0da
DG
2359 health_code_update(&health_thread_cmd);
2360
9d6c7d3f 2361 /* Flushing buffers */
bec39940
DG
2362 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2363 node.node) {
86acf0da 2364 health_code_update(&health_thread_cmd);
852d0037 2365 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2366 if (ret < 0) {
7db205b5 2367 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2368 app->pid, ua_chan->name, ret);
6d3686da
DG
2369 /* Continuing flushing all buffers */
2370 continue;
8be98f9a
MD
2371 }
2372 }
8be98f9a 2373
86acf0da
DG
2374 health_code_update(&health_thread_cmd);
2375
90d97d10 2376 /* Flush all buffers before stopping */
852d0037 2377 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2378 if (ret < 0) {
852d0037 2379 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2380 ret);
90d97d10
DG
2381 }
2382
7db205b5
DG
2383end:
2384 rcu_read_unlock();
86acf0da 2385 health_code_update(&health_thread_cmd);
8be98f9a
MD
2386 return 0;
2387
2388error_rcu_unlock:
2389 rcu_read_unlock();
86acf0da 2390 health_code_update(&health_thread_cmd);
8be98f9a
MD
2391 return -1;
2392}
2393
84cd17c6
MD
2394/*
2395 * Destroy a specific UST session in apps.
2396 */
2397int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2398{
2399 struct ust_app_session *ua_sess;
2400 struct lttng_ust_object_data obj;
bec39940
DG
2401 struct lttng_ht_iter iter;
2402 struct lttng_ht_node_ulong *node;
525b0740 2403 int ret;
84cd17c6 2404
852d0037 2405 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2406
2407 rcu_read_lock();
2408
e0c7ec2b
DG
2409 if (!app->compatible) {
2410 goto end;
2411 }
2412
84cd17c6 2413 __lookup_session_by_app(usess, app, &iter);
bec39940 2414 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2415 if (node == NULL) {
2416 /* Only malloc can failed so something is really wrong */
2417 goto error_rcu_unlock;
2418 }
2419 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2420 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2421 assert(!ret);
84cd17c6
MD
2422 obj.handle = ua_sess->handle;
2423 obj.shm_fd = -1;
2424 obj.wait_fd = -1;
2425 obj.memory_map_size = 0;
86acf0da 2426 health_code_update(&health_thread_cmd);
852d0037 2427 ustctl_release_object(app->sock, &obj);
84cd17c6 2428
86acf0da 2429 health_code_update(&health_thread_cmd);
852d0037 2430 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2431
84cd17c6 2432 /* Quiescent wait after stopping trace */
852d0037 2433 ustctl_wait_quiescent(app->sock);
84cd17c6 2434
e0c7ec2b
DG
2435end:
2436 rcu_read_unlock();
86acf0da 2437 health_code_update(&health_thread_cmd);
84cd17c6
MD
2438 return 0;
2439
2440error_rcu_unlock:
2441 rcu_read_unlock();
86acf0da 2442 health_code_update(&health_thread_cmd);
84cd17c6
MD
2443 return -1;
2444}
2445
5b4a0ec0
DG
2446/*
2447 * Start tracing for the UST session.
2448 */
421cb601
DG
2449int ust_app_start_trace_all(struct ltt_ust_session *usess)
2450{
2451 int ret = 0;
bec39940 2452 struct lttng_ht_iter iter;
421cb601 2453 struct ust_app *app;
48842b30 2454
421cb601
DG
2455 DBG("Starting all UST traces");
2456
2457 rcu_read_lock();
421cb601 2458
852d0037 2459 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2460 ret = ust_app_start_trace(usess, app);
48842b30 2461 if (ret < 0) {
5b4a0ec0
DG
2462 /* Continue to next apps even on error */
2463 continue;
48842b30 2464 }
48842b30 2465 }
5b4a0ec0 2466
48842b30
DG
2467 rcu_read_unlock();
2468
2469 return 0;
2470}
487cf67c 2471
8be98f9a
MD
2472/*
2473 * Start tracing for the UST session.
2474 */
2475int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2476{
2477 int ret = 0;
bec39940 2478 struct lttng_ht_iter iter;
8be98f9a
MD
2479 struct ust_app *app;
2480
2481 DBG("Stopping all UST traces");
2482
2483 rcu_read_lock();
2484
852d0037 2485 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2486 ret = ust_app_stop_trace(usess, app);
2487 if (ret < 0) {
2488 /* Continue to next apps even on error */
2489 continue;
2490 }
2491 }
2492
2493 rcu_read_unlock();
2494
2495 return 0;
2496}
2497
84cd17c6
MD
2498/*
2499 * Destroy app UST session.
2500 */
2501int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2502{
2503 int ret = 0;
bec39940 2504 struct lttng_ht_iter iter;
84cd17c6
MD
2505 struct ust_app *app;
2506
2507 DBG("Destroy all UST traces");
2508
2509 rcu_read_lock();
2510
852d0037 2511 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2512 ret = ust_app_destroy_trace(usess, app);
2513 if (ret < 0) {
2514 /* Continue to next apps even on error */
2515 continue;
2516 }
2517 }
2518
2519 rcu_read_unlock();
2520
2521 return 0;
2522}
2523
5b4a0ec0
DG
2524/*
2525 * Add channels/events from UST global domain to registered apps at sock.
2526 */
487cf67c
DG
2527void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2528{
55c54cce 2529 int ret = 0;
727d5404 2530 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2531 struct ust_app *app;
2532 struct ust_app_session *ua_sess;
2533 struct ust_app_channel *ua_chan;
2534 struct ust_app_event *ua_event;
727d5404 2535 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2536
2537 if (usess == NULL) {
5b4a0ec0 2538 ERR("No UST session on global update. Returning");
1f3580c7
DG
2539 goto error;
2540 }
2541
a991f516
MD
2542 DBG2("UST app global update for app sock %d for session id %d", sock,
2543 usess->id);
487cf67c 2544
284d8f55
DG
2545 rcu_read_lock();
2546
487cf67c
DG
2547 app = find_app_by_sock(sock);
2548 if (app == NULL) {
2549 ERR("Failed to update app sock %d", sock);
2550 goto error;
2551 }
2552
e0c7ec2b
DG
2553 if (!app->compatible) {
2554 goto error;
2555 }
2556
421cb601 2557 ua_sess = create_ust_app_session(usess, app);
487cf67c 2558 if (ua_sess == NULL) {
487cf67c
DG
2559 goto error;
2560 }
2561
284d8f55
DG
2562 /*
2563 * We can iterate safely here over all UST app session sicne the create ust
2564 * app session above made a shadow copy of the UST global domain from the
2565 * ltt ust session.
2566 */
bec39940
DG
2567 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2568 node.node) {
284d8f55
DG
2569 ret = create_ust_channel(app, ua_sess, ua_chan);
2570 if (ret < 0) {
2571 /* FIXME: Should we quit here or continue... */
2572 continue;
487cf67c
DG
2573 }
2574
727d5404
DG
2575 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2576 node.node) {
2577 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2578 if (ret < 0) {
2579 /* FIXME: Should we quit here or continue... */
2580 continue;
2581 }
2582 }
2583
2584
284d8f55 2585 /* For each events */
bec39940
DG
2586 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2587 node.node) {
284d8f55
DG
2588 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2589 if (ret < 0) {
2590 /* FIXME: Should we quit here or continue... */
2591 continue;
487cf67c 2592 }
727d5404
DG
2593
2594 /* Add context on events. */
2595 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2596 ua_ctx, node.node) {
2597 ret = create_ust_event_context(ua_event, ua_ctx, app);
2598 if (ret < 0) {
2599 /* FIXME: Should we quit here or continue... */
2600 continue;
2601 }
2602 }
53a80697
MD
2603 ret = set_ust_event_filter(ua_event, app);
2604 if (ret < 0) {
2605 /* FIXME: Should we quit here or continue... */
2606 continue;
2607 }
36dc12cc 2608 }
487cf67c
DG
2609 }
2610
36dc12cc 2611 if (usess->start_trace) {
421cb601 2612 ret = ust_app_start_trace(usess, app);
36dc12cc 2613 if (ret < 0) {
36dc12cc
DG
2614 goto error;
2615 }
2616
852d0037 2617 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2618 }
2619
487cf67c
DG
2620error:
2621 rcu_read_unlock();
2622 return;
2623}
55cc08a6
DG
2624
2625/*
2626 * Add context to a specific channel for global UST domain.
2627 */
2628int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2629 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2630{
2631 int ret = 0;
bec39940
DG
2632 struct lttng_ht_node_str *ua_chan_node;
2633 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2634 struct ust_app_channel *ua_chan = NULL;
2635 struct ust_app_session *ua_sess;
2636 struct ust_app *app;
2637
2638 rcu_read_lock();
2639
852d0037 2640 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2641 if (!app->compatible) {
2642 /*
2643 * TODO: In time, we should notice the caller of this error by
2644 * telling him that this is a version error.
2645 */
2646 continue;
2647 }
55cc08a6
DG
2648 ua_sess = lookup_session_by_app(usess, app);
2649 if (ua_sess == NULL) {
2650 continue;
2651 }
2652
2653 /* Lookup channel in the ust app session */
bec39940
DG
2654 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2655 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2656 if (ua_chan_node == NULL) {
2657 continue;
2658 }
2659 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2660 node);
2661
2662 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2663 if (ret < 0) {
2664 continue;
2665 }
2666 }
2667
55cc08a6
DG
2668 rcu_read_unlock();
2669 return ret;
2670}
2671
2672/*
2673 * Add context to a specific event in a channel for global UST domain.
2674 */
2675int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2676 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2677 struct ltt_ust_context *uctx)
2678{
2679 int ret = 0;
bec39940
DG
2680 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2681 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2682 struct ust_app_session *ua_sess;
2683 struct ust_app_event *ua_event;
2684 struct ust_app_channel *ua_chan = NULL;
2685 struct ust_app *app;
2686
2687 rcu_read_lock();
2688
852d0037 2689 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2690 if (!app->compatible) {
2691 /*
2692 * TODO: In time, we should notice the caller of this error by
2693 * telling him that this is a version error.
2694 */
2695 continue;
2696 }
55cc08a6
DG
2697 ua_sess = lookup_session_by_app(usess, app);
2698 if (ua_sess == NULL) {
2699 continue;
2700 }
2701
2702 /* Lookup channel in the ust app session */
bec39940
DG
2703 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2704 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2705 if (ua_chan_node == NULL) {
2706 continue;
2707 }
2708 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2709 node);
2710
bec39940
DG
2711 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2712 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2713 if (ua_event_node == NULL) {
2714 continue;
2715 }
2716 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2717 node);
2718
2719 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2720 if (ret < 0) {
2721 continue;
2722 }
2723 }
2724
55cc08a6
DG
2725 rcu_read_unlock();
2726 return ret;
2727}
76d45b40 2728
53a80697
MD
2729/*
2730 * Add context to a specific event in a channel for global UST domain.
2731 */
2732int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2733 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2734 struct lttng_filter_bytecode *bytecode)
2735{
2736 int ret = 0;
2737 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2738 struct lttng_ht_iter iter, uiter;
2739 struct ust_app_session *ua_sess;
2740 struct ust_app_event *ua_event;
2741 struct ust_app_channel *ua_chan = NULL;
2742 struct ust_app *app;
2743
2744 rcu_read_lock();
2745
2746 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2747 if (!app->compatible) {
2748 /*
2749 * TODO: In time, we should notice the caller of this error by
2750 * telling him that this is a version error.
2751 */
2752 continue;
2753 }
2754 ua_sess = lookup_session_by_app(usess, app);
2755 if (ua_sess == NULL) {
2756 continue;
2757 }
2758
2759 /* Lookup channel in the ust app session */
2760 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2761 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2762 if (ua_chan_node == NULL) {
2763 continue;
2764 }
2765 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2766 node);
2767
2768 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2769 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2770 if (ua_event_node == NULL) {
2771 continue;
2772 }
2773 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2774 node);
2775
2776 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2777 if (ret < 0) {
2778 continue;
2779 }
2780 }
2781
2782 rcu_read_unlock();
2783 return ret;
2784}
2785
76d45b40
DG
2786/*
2787 * Enable event for a channel from a UST session for a specific PID.
2788 */
2789int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2790 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2791{
2792 int ret = 0;
bec39940
DG
2793 struct lttng_ht_iter iter;
2794 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2795 struct ust_app *app;
2796 struct ust_app_session *ua_sess;
2797 struct ust_app_channel *ua_chan;
2798 struct ust_app_event *ua_event;
2799
2800 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2801
2802 rcu_read_lock();
2803
2804 app = ust_app_find_by_pid(pid);
2805 if (app == NULL) {
2806 ERR("UST app enable event per PID %d not found", pid);
2807 ret = -1;
2808 goto error;
2809 }
2810
e0c7ec2b
DG
2811 if (!app->compatible) {
2812 ret = 0;
2813 goto error;
2814 }
2815
76d45b40
DG
2816 ua_sess = lookup_session_by_app(usess, app);
2817 /* If ua_sess is NULL, there is a code flow error */
2818 assert(ua_sess);
2819
2820 /* Lookup channel in the ust app session */
bec39940
DG
2821 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2822 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2823 /* If the channel is not found, there is a code flow error */
2824 assert(ua_chan_node);
2825
2826 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2827
bec39940
DG
2828 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2829 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2830 if (ua_event_node == NULL) {
2831 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2832 if (ret < 0) {
2833 goto error;
2834 }
2835 } else {
2836 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2837
2838 ret = enable_ust_app_event(ua_sess, ua_event, app);
2839 if (ret < 0) {
2840 goto error;
2841 }
2842 }
2843
2844error:
2845 rcu_read_unlock();
2846 return ret;
2847}
7f79d3a1
DG
2848
2849/*
2850 * Disable event for a channel from a UST session for a specific PID.
2851 */
2852int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2853 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2854{
2855 int ret = 0;
bec39940
DG
2856 struct lttng_ht_iter iter;
2857 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2858 struct ust_app *app;
2859 struct ust_app_session *ua_sess;
2860 struct ust_app_channel *ua_chan;
2861 struct ust_app_event *ua_event;
2862
2863 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2864
2865 rcu_read_lock();
2866
2867 app = ust_app_find_by_pid(pid);
2868 if (app == NULL) {
2869 ERR("UST app disable event per PID %d not found", pid);
2870 ret = -1;
2871 goto error;
2872 }
2873
e0c7ec2b
DG
2874 if (!app->compatible) {
2875 ret = 0;
2876 goto error;
2877 }
2878
7f79d3a1
DG
2879 ua_sess = lookup_session_by_app(usess, app);
2880 /* If ua_sess is NULL, there is a code flow error */
2881 assert(ua_sess);
2882
2883 /* Lookup channel in the ust app session */
bec39940
DG
2884 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2885 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2886 if (ua_chan_node == NULL) {
2887 /* Channel does not exist, skip disabling */
2888 goto error;
2889 }
2890 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2891
bec39940
DG
2892 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2893 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2894 if (ua_event_node == NULL) {
2895 /* Event does not exist, skip disabling */
2896 goto error;
2897 }
2898 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2899
2900 ret = disable_ust_app_event(ua_sess, ua_event, app);
2901 if (ret < 0) {
2902 goto error;
2903 }
2904
2905error:
2906 rcu_read_unlock();
2907 return ret;
2908}
e0c7ec2b
DG
2909
2910/*
2911 * Validate version of UST apps and set the compatible bit.
2912 */
2913int ust_app_validate_version(int sock)
2914{
2915 int ret;
2916 struct ust_app *app;
2917
2918 rcu_read_lock();
2919
2920 app = find_app_by_sock(sock);
2921 assert(app);
2922
86acf0da
DG
2923 health_code_update(&health_thread_cmd);
2924
e0c7ec2b
DG
2925 ret = ustctl_tracer_version(sock, &app->version);
2926 if (ret < 0) {
2927 goto error;
2928 }
2929
2930 /* Validate version */
aee0cea0 2931 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2932 goto error;
2933 }
2934
68264071 2935 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2936 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2937 UST_APP_MAJOR_VERSION);
2938 app->compatible = 1;
2939 rcu_read_unlock();
86acf0da 2940 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2941 return 0;
2942
2943error:
68264071 2944 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2945 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2946 UST_APP_MAJOR_VERSION);
2947 app->compatible = 0;
2948 rcu_read_unlock();
86acf0da 2949 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2950 return -1;
2951}
4466912f
DG
2952
2953/*
2954 * Calibrate registered applications.
2955 */
2956int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2957{
2958 int ret = 0;
2959 struct lttng_ht_iter iter;
2960 struct ust_app *app;
2961
2962 rcu_read_lock();
2963
852d0037 2964 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2965 if (!app->compatible) {
2966 /*
2967 * TODO: In time, we should notice the caller of this error by
2968 * telling him that this is a version error.
2969 */
2970 continue;
2971 }
2972
86acf0da
DG
2973 health_code_update(&health_thread_cmd);
2974
852d0037 2975 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2976 if (ret < 0) {
2977 switch (ret) {
2978 case -ENOSYS:
2979 /* Means that it's not implemented on the tracer side. */
2980 ret = 0;
2981 break;
2982 default:
2983 /* TODO: Report error to user */
2984 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2985 app->pid, ret);
4466912f
DG
2986 break;
2987 }
2988 }
2989 }
2990
2991 DBG("UST app global domain calibration finished");
2992
2993 rcu_read_unlock();
2994
86acf0da
DG
2995 health_code_update(&health_thread_cmd);
2996
4466912f
DG
2997 return ret;
2998}
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