Add lttng-error.h containing every API err. code
[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 /*
852d0037
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205 * Wait until we have deleted the application from the sock hash table
206 * before closing this socket, otherwise an application could re-use the
207 * socket ID and race with the teardown, using the same hash table entry.
208 *
209 * It's OK to leave the close in call_rcu. We want it to stay unique for
210 * all RCU readers that could run concurrently with unregister app,
211 * therefore we _need_ to only close that socket after a grace period. So
212 * it should stay in this RCU callback.
213 *
214 * This close() is a very important step of the synchronization model so
215 * every modification to this function must be carefully reviewed.
6414a713 216 */
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217 ret = close(sock);
218 if (ret) {
219 PERROR("close");
220 }
4063050c 221 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 222
852d0037 223 DBG2("UST app pid %d deleted", app->pid);
284d8f55 224 free(app);
bec39940 225
f6a9efaa 226 rcu_read_unlock();
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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';
bec39940
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328 ua_event->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
329 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
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330
331 /* Copy attributes */
332 if (attr) {
333 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
334 }
335
336 DBG3("UST app event %s allocated", ua_event->name);
337
338 return ua_event;
339
340error:
341 return NULL;
342}
343
344/*
345 * Alloc new UST app context.
346 */
347static
348struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
349{
350 struct ust_app_ctx *ua_ctx;
351
352 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
353 if (ua_ctx == NULL) {
354 goto error;
355 }
356
357 if (uctx) {
358 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
359 }
360
361 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
362
363error:
364 return ua_ctx;
365}
366
099e26bd 367/*
421cb601
DG
368 * Find an ust_app using the sock and return it. RCU read side lock must be
369 * held before calling this helper function.
099e26bd 370 */
8b366481
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371static
372struct ust_app *find_app_by_sock(int sock)
099e26bd 373{
bec39940 374 struct lttng_ht_node_ulong *node;
bec39940 375 struct lttng_ht_iter iter;
f6a9efaa 376
852d0037 377 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 378 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
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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
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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
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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
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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
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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
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545
546error:
86acf0da 547 health_code_update(&health_thread_cmd);
78f0bacd
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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
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571
572error:
86acf0da 573 health_code_update(&health_thread_cmd);
edb67388
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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
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586 health_code_update(&health_thread_cmd);
587
5b4a0ec0
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588 uattr.overwrite = ua_sess->metadata->attr.overwrite;
589 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
590 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
591 uattr.switch_timer_interval =
592 ua_sess->metadata->attr.switch_timer_interval;
593 uattr.read_timer_interval =
594 ua_sess->metadata->attr.read_timer_interval;
595 uattr.output = ua_sess->metadata->attr.output;
596
4063050c
MD
597 /* We are going to receive 2 fds, we need to reserve them. */
598 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
599 if (ret < 0) {
600 ERR("Exhausted number of available FD upon metadata open");
601 goto error;
602 }
5b4a0ec0 603 /* UST tracer metadata creation */
852d0037 604 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
605 &ua_sess->metadata->obj);
606 if (ret < 0) {
fc34caaa 607 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 608 app->pid, ret);
f6a9efaa 609 goto error;
0177d773 610 }
f6a9efaa 611
6d3686da
DG
612 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
613
f6a9efaa 614error:
86acf0da 615 health_code_update(&health_thread_cmd);
5b4a0ec0 616 return ret;
91d76f53
DG
617}
618
619/*
5b4a0ec0 620 * Create stream onto the UST tracer for a UST session.
91d76f53 621 */
5b4a0ec0
DG
622static int create_ust_stream(struct ust_app *app,
623 struct ust_app_session *ua_sess)
91d76f53 624{
5b4a0ec0 625 int ret;
421cb601 626
86acf0da
DG
627 health_code_update(&health_thread_cmd);
628
4063050c
MD
629 /* We are going to receive 2 fds, we need to reserve them. */
630 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
631 if (ret < 0) {
632 ERR("Exhausted number of available FD upon metadata stream create");
633 goto error;
634 }
852d0037 635 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
636 &ua_sess->metadata->stream_obj);
637 if (ret < 0) {
638 ERR("UST create metadata stream failed");
421cb601 639 goto error;
91d76f53 640 }
421cb601 641
421cb601 642error:
86acf0da 643 health_code_update(&health_thread_cmd);
5b4a0ec0 644 return ret;
91d76f53
DG
645}
646
b551a063 647/*
5b4a0ec0 648 * Create the specified channel onto the UST tracer for a UST session.
b551a063 649 */
5b4a0ec0
DG
650static int create_ust_channel(struct ust_app *app,
651 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 652{
5b4a0ec0 653 int ret;
b551a063 654
86acf0da
DG
655 health_code_update(&health_thread_cmd);
656
5b4a0ec0 657 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
658
659 /* We are going to receive 2 fds, we need to reserve them. */
660 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
661 if (ret < 0) {
662 ERR("Exhausted number of available FD upon create channel");
663 goto error;
664 }
86acf0da
DG
665
666 health_code_update(&health_thread_cmd);
667
852d0037 668 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
669 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
670 if (ret < 0) {
58f3ca76 671 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 672 "and session handle %d with ret %d",
852d0037 673 ua_chan->name, app->pid, app->sock,
5b4a0ec0 674 ua_sess->handle, ret);
4063050c 675 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
676 goto error;
677 }
678
5b4a0ec0 679 ua_chan->handle = ua_chan->obj->handle;
b551a063 680
5b4a0ec0 681 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 682 ua_chan->name, app->pid, app->sock);
b551a063 683
86acf0da
DG
684 health_code_update(&health_thread_cmd);
685
8535a6d9
DG
686 /* If channel is not enabled, disable it on the tracer */
687 if (!ua_chan->enabled) {
688 ret = disable_ust_channel(app, ua_sess, ua_chan);
689 if (ret < 0) {
690 goto error;
691 }
692 }
693
b551a063 694error:
86acf0da 695 health_code_update(&health_thread_cmd);
b551a063
DG
696 return ret;
697}
698
91d76f53 699/*
5b4a0ec0 700 * Create the specified event onto the UST tracer for a UST session.
91d76f53 701 */
edb67388
DG
702static
703int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
704 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 705{
5b4a0ec0 706 int ret = 0;
284d8f55 707
86acf0da
DG
708 health_code_update(&health_thread_cmd);
709
5b4a0ec0 710 /* Create UST event on tracer */
852d0037 711 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
712 &ua_event->obj);
713 if (ret < 0) {
a027b2d2 714 if (ret == -EEXIST || ret == -EPERM) {
fc34caaa
DG
715 ret = 0;
716 goto error;
717 }
5b4a0ec0 718 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 719 ua_event->attr.name, app->pid, ret);
5b4a0ec0 720 goto error;
91d76f53 721 }
f6a9efaa 722
5b4a0ec0 723 ua_event->handle = ua_event->obj->handle;
284d8f55 724
5b4a0ec0 725 DBG2("UST app event %s created successfully for pid:%d",
852d0037 726 ua_event->attr.name, app->pid);
f6a9efaa 727
86acf0da
DG
728 health_code_update(&health_thread_cmd);
729
8535a6d9 730 /* If event not enabled, disable it on the tracer */
fc34caaa 731 if (ua_event->enabled == 0) {
8535a6d9
DG
732 ret = disable_ust_event(app, ua_sess, ua_event);
733 if (ret < 0) {
fc34caaa
DG
734 /*
735 * If we hit an EPERM, something is wrong with our disable call. If
736 * we get an EEXIST, there is a problem on the tracer side since we
737 * just created it.
738 */
739 switch (ret) {
740 case -EPERM:
741 /* Code flow problem */
742 assert(0);
743 case -EEXIST:
744 /* It's OK for our use case. */
745 ret = 0;
746 break;
747 default:
748 break;
749 }
8535a6d9
DG
750 goto error;
751 }
752 }
753
5b4a0ec0 754error:
86acf0da 755 health_code_update(&health_thread_cmd);
5b4a0ec0 756 return ret;
91d76f53 757}
48842b30 758
5b4a0ec0
DG
759/*
760 * Copy data between an UST app event and a LTT event.
761 */
421cb601 762static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
763 struct ltt_ust_event *uevent)
764{
bec39940 765 struct lttng_ht_iter iter;
55cc08a6
DG
766 struct ltt_ust_context *uctx;
767 struct ust_app_ctx *ua_ctx;
768
48842b30
DG
769 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
770 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
771
fc34caaa
DG
772 ua_event->enabled = uevent->enabled;
773
5b4a0ec0
DG
774 /* Copy event attributes */
775 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
776
53a80697
MD
777 /* Copy filter bytecode */
778 if (uevent->filter) {
779 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
780 uevent->filter->len);
781 if (!ua_event->filter) {
782 return;
783 }
784 memcpy(ua_event->filter, uevent->filter,
785 sizeof(*ua_event->filter) + uevent->filter->len);
786 }
bec39940 787 cds_lfht_for_each_entry(uevent->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
788 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
789 if (ua_ctx == NULL) {
fc34caaa
DG
790 /* malloc() failed. We should simply stop */
791 return;
55cc08a6 792 }
fc34caaa 793
bec39940
DG
794 lttng_ht_node_init_ulong(&ua_ctx->node,
795 (unsigned long) ua_ctx->ctx.ctx);
796 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6 797 }
48842b30
DG
798}
799
5b4a0ec0
DG
800/*
801 * Copy data between an UST app channel and a LTT channel.
802 */
421cb601 803static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
804 struct ltt_ust_channel *uchan)
805{
bec39940
DG
806 struct lttng_ht_iter iter;
807 struct lttng_ht_node_str *ua_event_node;
48842b30 808 struct ltt_ust_event *uevent;
55cc08a6 809 struct ltt_ust_context *uctx;
48842b30 810 struct ust_app_event *ua_event;
55cc08a6 811 struct ust_app_ctx *ua_ctx;
48842b30 812
fc34caaa 813 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
814
815 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
816 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
817 /* Copy event attributes */
818 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 819
fc34caaa
DG
820 ua_chan->enabled = uchan->enabled;
821
bec39940 822 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
823 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
824 if (ua_ctx == NULL) {
825 continue;
826 }
bec39940
DG
827 lttng_ht_node_init_ulong(&ua_ctx->node,
828 (unsigned long) ua_ctx->ctx.ctx);
829 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 830 }
48842b30 831
421cb601 832 /* Copy all events from ltt ust channel to ust app channel */
bec39940
DG
833 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
834 struct lttng_ht_iter uiter;
ba767faf 835
bec39940
DG
836 lttng_ht_lookup(ua_chan->events, (void *) uevent->attr.name, &uiter);
837 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
48842b30 838 if (ua_event_node == NULL) {
421cb601 839 DBG2("UST event %s not found on shadow copy channel",
48842b30 840 uevent->attr.name);
284d8f55 841 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 842 if (ua_event == NULL) {
5b4a0ec0 843 continue;
48842b30 844 }
421cb601 845 shadow_copy_event(ua_event, uevent);
bec39940 846 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
48842b30 847 }
48842b30
DG
848 }
849
fc34caaa 850 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
851}
852
5b4a0ec0
DG
853/*
854 * Copy data between a UST app session and a regular LTT session.
855 */
421cb601 856static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 857 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 858{
bec39940
DG
859 struct lttng_ht_node_str *ua_chan_node;
860 struct lttng_ht_iter iter;
48842b30
DG
861 struct ltt_ust_channel *uchan;
862 struct ust_app_channel *ua_chan;
477d7741
MD
863 time_t rawtime;
864 struct tm *timeinfo;
865 char datetime[16];
866 int ret;
867
868 /* Get date and time for unique app path */
869 time(&rawtime);
870 timeinfo = localtime(&rawtime);
871 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 872
421cb601 873 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 874
a991f516 875 ua_sess->id = usess->id;
6df2e2c9
MD
876 ua_sess->uid = usess->uid;
877 ua_sess->gid = usess->gid;
48842b30 878
00e2e675
DG
879 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
880 datetime);
477d7741
MD
881 if (ret < 0) {
882 PERROR("asprintf UST shadow copy session");
883 /* TODO: We cannot return an error from here.. */
884 assert(0);
885 }
886
48842b30
DG
887 /* TODO: support all UST domain */
888
889 /* Iterate over all channels in global domain. */
bec39940
DG
890 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
891 uchan, node.node) {
892 struct lttng_ht_iter uiter;
ba767faf 893
bec39940
DG
894 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
895 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 896 if (ua_chan_node != NULL) {
fc34caaa 897 /* Session exist. Contiuing. */
5b4a0ec0
DG
898 continue;
899 }
421cb601 900
5b4a0ec0
DG
901 DBG2("Channel %s not found on shadow session copy, creating it",
902 uchan->name);
903 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
904 if (ua_chan == NULL) {
fc34caaa 905 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 906 continue;
48842b30
DG
907 }
908
5b4a0ec0 909 shadow_copy_channel(ua_chan, uchan);
bec39940 910 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
911 }
912}
913
78f0bacd
DG
914/*
915 * Lookup sesison wrapper.
916 */
84cd17c6
MD
917static
918void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 919 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
920{
921 /* Get right UST app session from app */
2c348c10 922 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
923}
924
421cb601
DG
925/*
926 * Return ust app session from the app session hashtable using the UST session
a991f516 927 * id.
421cb601 928 */
48842b30
DG
929static struct ust_app_session *lookup_session_by_app(
930 struct ltt_ust_session *usess, struct ust_app *app)
931{
bec39940
DG
932 struct lttng_ht_iter iter;
933 struct lttng_ht_node_ulong *node;
48842b30 934
84cd17c6 935 __lookup_session_by_app(usess, app, &iter);
bec39940 936 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
937 if (node == NULL) {
938 goto error;
939 }
940
941 return caa_container_of(node, struct ust_app_session, node);
942
943error:
944 return NULL;
945}
946
421cb601
DG
947/*
948 * Create a UST session onto the tracer of app and add it the session
949 * hashtable.
950 *
951 * Return ust app session or NULL on error.
952 */
953static struct ust_app_session *create_ust_app_session(
954 struct ltt_ust_session *usess, struct ust_app *app)
955{
956 int ret;
957 struct ust_app_session *ua_sess;
958
86acf0da
DG
959 health_code_update(&health_thread_cmd);
960
421cb601
DG
961 ua_sess = lookup_session_by_app(usess, app);
962 if (ua_sess == NULL) {
a991f516 963 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 964 app->pid, usess->id);
421cb601
DG
965 ua_sess = alloc_ust_app_session();
966 if (ua_sess == NULL) {
967 /* Only malloc can failed so something is really wrong */
fc34caaa 968 goto end;
421cb601 969 }
477d7741 970 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
971 }
972
86acf0da
DG
973 health_code_update(&health_thread_cmd);
974
421cb601 975 if (ua_sess->handle == -1) {
852d0037 976 ret = ustctl_create_session(app->sock);
421cb601 977 if (ret < 0) {
852d0037 978 ERR("Creating session for app pid %d", app->pid);
915d047c
DG
979 /* This means that the tracer is gone... */
980 ua_sess = (void*) -1UL;
421cb601
DG
981 goto error;
982 }
983
421cb601
DG
984 ua_sess->handle = ret;
985
986 /* Add ust app session to app's HT */
2c348c10 987 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 988 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
989
990 DBG2("UST app session created successfully with handle %d", ret);
991 }
992
fc34caaa 993end:
86acf0da 994 health_code_update(&health_thread_cmd);
421cb601
DG
995 return ua_sess;
996
997error:
fc34caaa 998 delete_ust_app_session(-1, ua_sess);
86acf0da 999 health_code_update(&health_thread_cmd);
421cb601
DG
1000 return NULL;
1001}
1002
55cc08a6
DG
1003/*
1004 * Create a context for the channel on the tracer.
1005 */
1006static
1007int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1008 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1009 struct ust_app *app)
1010{
1011 int ret = 0;
bec39940
DG
1012 struct lttng_ht_iter iter;
1013 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1014 struct ust_app_ctx *ua_ctx;
1015
1016 DBG2("UST app adding context to channel %s", ua_chan->name);
1017
bec39940
DG
1018 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1019 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1020 if (node != NULL) {
1021 ret = -EEXIST;
1022 goto error;
1023 }
1024
1025 ua_ctx = alloc_ust_app_ctx(uctx);
1026 if (ua_ctx == NULL) {
1027 /* malloc failed */
1028 ret = -1;
1029 goto error;
1030 }
1031
bec39940
DG
1032 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1033 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1034
1035 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1036 if (ret < 0) {
1037 goto error;
1038 }
1039
1040error:
1041 return ret;
1042}
1043
1044/*
1045 * Create an UST context and enable it for the event on the tracer.
1046 */
1047static
1048int create_ust_app_event_context(struct ust_app_session *ua_sess,
1049 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
1050 struct ust_app *app)
1051{
1052 int ret = 0;
bec39940
DG
1053 struct lttng_ht_iter iter;
1054 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1055 struct ust_app_ctx *ua_ctx;
1056
1057 DBG2("UST app adding context to event %s", ua_event->name);
1058
bec39940
DG
1059 lttng_ht_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1060 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1061 if (node != NULL) {
1062 ret = -EEXIST;
1063 goto error;
1064 }
1065
1066 ua_ctx = alloc_ust_app_ctx(uctx);
1067 if (ua_ctx == NULL) {
1068 /* malloc failed */
1069 ret = -1;
1070 goto error;
1071 }
1072
bec39940
DG
1073 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1074 lttng_ht_add_unique_ulong(ua_event->ctx, &ua_ctx->node);
55cc08a6
DG
1075
1076 ret = create_ust_event_context(ua_event, ua_ctx, app);
1077 if (ret < 0) {
1078 goto error;
1079 }
1080
1081error:
1082 return ret;
1083}
1084
53a80697
MD
1085/*
1086 * Set UST filter for the event on the tracer.
1087 */
1088static
1089int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1090 struct ust_app_event *ua_event,
1091 struct lttng_filter_bytecode *bytecode,
1092 struct ust_app *app)
1093{
1094 int ret = 0;
1095
1096 DBG2("UST app adding context to event %s", ua_event->name);
1097
1098 /* Copy filter bytecode */
1099 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1100 if (!ua_event->filter) {
1101 return -ENOMEM;
1102 }
1103 memcpy(ua_event->filter, bytecode,
1104 sizeof(*ua_event->filter) + bytecode->len);
1105 ret = set_ust_event_filter(ua_event, app);
1106 if (ret < 0) {
1107 goto error;
1108 }
1109
1110error:
1111 return ret;
1112}
1113
edb67388
DG
1114/*
1115 * Enable on the tracer side a ust app event for the session and channel.
1116 */
1117static
1118int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1119 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1120{
1121 int ret;
1122
1123 ret = enable_ust_event(app, ua_sess, ua_event);
1124 if (ret < 0) {
1125 goto error;
1126 }
1127
1128 ua_event->enabled = 1;
1129
1130error:
1131 return ret;
1132}
1133
9730260e
DG
1134/*
1135 * Disable on the tracer side a ust app event for the session and channel.
1136 */
1137static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1138 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1139{
1140 int ret;
1141
1142 ret = disable_ust_event(app, ua_sess, ua_event);
1143 if (ret < 0) {
1144 goto error;
1145 }
1146
1147 ua_event->enabled = 0;
1148
1149error:
1150 return ret;
1151}
1152
78f0bacd
DG
1153/*
1154 * Lookup ust app channel for session and disable it on the tracer side.
1155 */
8535a6d9
DG
1156static
1157int disable_ust_app_channel(struct ust_app_session *ua_sess,
1158 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1159{
8535a6d9 1160 int ret;
78f0bacd
DG
1161
1162 ret = disable_ust_channel(app, ua_sess, ua_chan);
1163 if (ret < 0) {
1164 goto error;
1165 }
1166
8535a6d9
DG
1167 ua_chan->enabled = 0;
1168
78f0bacd
DG
1169error:
1170 return ret;
1171}
1172
1173/*
1174 * Lookup ust app channel for session and enable it on the tracer side.
1175 */
1176static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1177 struct ltt_ust_channel *uchan, struct ust_app *app)
1178{
1179 int ret = 0;
bec39940
DG
1180 struct lttng_ht_iter iter;
1181 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1182 struct ust_app_channel *ua_chan;
1183
bec39940
DG
1184 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1185 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1186 if (ua_chan_node == NULL) {
a991f516
MD
1187 DBG2("Unable to find channel %s in ust session id %u",
1188 uchan->name, ua_sess->id);
78f0bacd
DG
1189 goto error;
1190 }
1191
1192 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1193
1194 ret = enable_ust_channel(app, ua_sess, ua_chan);
1195 if (ret < 0) {
1196 goto error;
1197 }
1198
1199error:
1200 return ret;
1201}
1202
284d8f55 1203/*
5b4a0ec0 1204 * Create UST app channel and create it on the tracer.
284d8f55 1205 */
5b4a0ec0
DG
1206static struct ust_app_channel *create_ust_app_channel(
1207 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1208 struct ust_app *app)
1209{
1210 int ret = 0;
bec39940
DG
1211 struct lttng_ht_iter iter;
1212 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1213 struct ust_app_channel *ua_chan;
1214
1215 /* Lookup channel in the ust app session */
bec39940
DG
1216 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1217 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1218 if (ua_chan_node != NULL) {
5b4a0ec0 1219 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1220 goto end;
5b4a0ec0
DG
1221 }
1222
fc34caaa
DG
1223 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1224 if (ua_chan == NULL) {
1225 /* Only malloc can fail here */
1226 goto error;
1227 }
1228 shadow_copy_channel(ua_chan, uchan);
1229
5b4a0ec0
DG
1230 ret = create_ust_channel(app, ua_sess, ua_chan);
1231 if (ret < 0) {
fc34caaa
DG
1232 /* Not found previously means that it does not exist on the tracer */
1233 assert(ret != -EEXIST);
5b4a0ec0
DG
1234 goto error;
1235 }
1236
58f3ca76
DG
1237 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1238
fc34caaa 1239 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1240 app->pid);
fc34caaa
DG
1241
1242end:
5b4a0ec0
DG
1243 return ua_chan;
1244
1245error:
fc34caaa 1246 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1247 return NULL;
1248}
1249
1250/*
1251 * Create UST app event and create it on the tracer side.
1252 */
edb67388
DG
1253static
1254int create_ust_app_event(struct ust_app_session *ua_sess,
1255 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1256 struct ust_app *app)
284d8f55 1257{
edb67388 1258 int ret = 0;
bec39940
DG
1259 struct lttng_ht_iter iter;
1260 struct lttng_ht_node_str *ua_event_node;
5b4a0ec0 1261 struct ust_app_event *ua_event;
284d8f55 1262
5b4a0ec0 1263 /* Get event node */
bec39940
DG
1264 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
1265 ua_event_node = lttng_ht_iter_get_node_str(&iter);
edb67388 1266 if (ua_event_node != NULL) {
fc34caaa 1267 ret = -EEXIST;
edb67388
DG
1268 goto end;
1269 }
5b4a0ec0 1270
edb67388
DG
1271 /* Does not exist so create one */
1272 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1273 if (ua_event == NULL) {
1274 /* Only malloc can failed so something is really wrong */
1275 ret = -ENOMEM;
fc34caaa 1276 goto end;
5b4a0ec0 1277 }
edb67388 1278 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1279
edb67388 1280 /* Create it on the tracer side */
5b4a0ec0 1281 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1282 if (ret < 0) {
fc34caaa
DG
1283 /* Not found previously means that it does not exist on the tracer */
1284 assert(ret != -EEXIST);
284d8f55
DG
1285 goto error;
1286 }
1287
bec39940 1288 lttng_ht_add_unique_str(ua_chan->events, &ua_event->node);
284d8f55 1289
fc34caaa 1290 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1291 app->pid);
7f79d3a1 1292
edb67388 1293end:
fc34caaa
DG
1294 return ret;
1295
5b4a0ec0 1296error:
fc34caaa
DG
1297 /* Valid. Calling here is already in a read side lock */
1298 delete_ust_app_event(-1, ua_event);
edb67388 1299 return ret;
5b4a0ec0
DG
1300}
1301
1302/*
1303 * Create UST metadata and open it on the tracer side.
1304 */
1305static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1306 char *pathname, struct ust_app *app)
1307{
1308 int ret = 0;
1309
1310 if (ua_sess->metadata == NULL) {
1311 /* Allocate UST metadata */
1312 ua_sess->metadata = trace_ust_create_metadata(pathname);
1313 if (ua_sess->metadata == NULL) {
fc34caaa 1314 /* malloc() failed */
5b4a0ec0
DG
1315 goto error;
1316 }
1317
1318 ret = open_ust_metadata(app, ua_sess);
1319 if (ret < 0) {
7db205b5
DG
1320 DBG3("Opening metadata failed. Cleaning up memory");
1321
fc34caaa
DG
1322 /* Cleanup failed metadata struct */
1323 free(ua_sess->metadata);
7db205b5
DG
1324 /*
1325 * This is very important because delete_ust_app_session check if
1326 * the pointer is null or not in order to delete the metadata.
1327 */
1328 ua_sess->metadata = NULL;
5b4a0ec0
DG
1329 goto error;
1330 }
1331
852d0037 1332 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1333 }
1334
1335 /* Open UST metadata stream */
1336 if (ua_sess->metadata->stream_obj == NULL) {
1337 ret = create_ust_stream(app, ua_sess);
1338 if (ret < 0) {
1339 goto error;
1340 }
1341
477d7741
MD
1342 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1343 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1344 if (ret < 0) {
1345 PERROR("asprintf UST create stream");
1346 goto error;
1347 }
1348
1349 DBG2("UST metadata stream object created for app pid %d",
852d0037 1350 app->pid);
5b4a0ec0
DG
1351 } else {
1352 ERR("Attempting to create stream without metadata opened");
1353 goto error;
1354 }
1355
1356 return 0;
1357
1358error:
1359 return -1;
1360}
1361
1362/*
1363 * Return pointer to traceable apps list.
1364 */
bec39940 1365struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1366{
1367 return ust_app_ht;
1368}
1369
1370/*
1371 * Return ust app pointer or NULL if not found.
1372 */
1373struct ust_app *ust_app_find_by_pid(pid_t pid)
1374{
bec39940
DG
1375 struct lttng_ht_node_ulong *node;
1376 struct lttng_ht_iter iter;
5b4a0ec0
DG
1377
1378 rcu_read_lock();
bec39940
DG
1379 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1380 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1381 if (node == NULL) {
1382 DBG2("UST app no found with pid %d", pid);
1383 goto error;
1384 }
1385 rcu_read_unlock();
1386
1387 DBG2("Found UST app by pid %d", pid);
1388
852d0037 1389 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1390
1391error:
1392 rcu_read_unlock();
1393 return NULL;
1394}
1395
1396/*
1397 * Using pid and uid (of the app), allocate a new ust_app struct and
1398 * add it to the global traceable app list.
1399 *
0df502fd
MD
1400 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1401 * bitness is not supported.
5b4a0ec0
DG
1402 */
1403int ust_app_register(struct ust_register_msg *msg, int sock)
1404{
1405 struct ust_app *lta;
799e2c4f 1406 int ret;
5b4a0ec0 1407
173af62f
DG
1408 if ((msg->bits_per_long == 64 &&
1409 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1410 || (msg->bits_per_long == 32 &&
1411 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1412 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1413 "%d-bit long, but no consumerd for this long size is available.\n",
1414 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1415 ret = close(sock);
1416 if (ret) {
1417 PERROR("close");
1418 }
4063050c 1419 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1420 return -EINVAL;
1421 }
3f2c5fcc
MD
1422 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1423 ERR("Registration failed: application \"%s\" (pid: %d) has "
1424 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1425 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1426 ret = close(sock);
1427 if (ret) {
1428 PERROR("close");
1429 }
4063050c 1430 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1431 return -EINVAL;
1432 }
5b4a0ec0
DG
1433 lta = zmalloc(sizeof(struct ust_app));
1434 if (lta == NULL) {
1435 PERROR("malloc");
1436 return -ENOMEM;
1437 }
1438
1439 lta->ppid = msg->ppid;
1440 lta->uid = msg->uid;
1441 lta->gid = msg->gid;
e0c7ec2b 1442 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1443 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1444 lta->v_major = msg->major;
1445 lta->v_minor = msg->minor;
1446 strncpy(lta->name, msg->name, sizeof(lta->name));
1447 lta->name[16] = '\0';
bec39940 1448 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1449
852d0037
DG
1450 lta->pid = msg->pid;
1451 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1452 lta->sock = sock;
1453 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1454
1455 rcu_read_lock();
852d0037
DG
1456
1457 /*
1458 * On a re-registration, we want to kick out the previous registration of
1459 * that pid
1460 */
1461 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1462
1463 /*
1464 * The socket _should_ be unique until _we_ call close. So, a add_unique
1465 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1466 * already in the table.
1467 */
1468 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1469
5b4a0ec0
DG
1470 rcu_read_unlock();
1471
1472 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1473 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1474 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1475
1476 return 0;
1477}
1478
1479/*
1480 * Unregister app by removing it from the global traceable app list and freeing
1481 * the data struct.
1482 *
1483 * The socket is already closed at this point so no close to sock.
1484 */
1485void ust_app_unregister(int sock)
1486{
1487 struct ust_app *lta;
bec39940
DG
1488 struct lttng_ht_node_ulong *node;
1489 struct lttng_ht_iter iter;
525b0740 1490 int ret;
5b4a0ec0
DG
1491
1492 rcu_read_lock();
886459c6 1493
5b4a0ec0 1494 /* Get the node reference for a call_rcu */
852d0037 1495 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1496 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1497 if (node == NULL) {
852d0037 1498 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1499 goto error;
1500 }
284d8f55 1501
852d0037
DG
1502 lta = caa_container_of(node, struct ust_app, sock_n);
1503
1504 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1505
886459c6 1506 /* Remove application from PID hash table */
852d0037
DG
1507 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1508 assert(!ret);
1509
1510 /* Assign second node for deletion */
1511 iter.iter.node = &lta->pid_n.node;
1512
bec39940 1513 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1514 assert(!ret);
852d0037
DG
1515
1516 /* Free memory */
1517 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1518
284d8f55 1519error:
5b4a0ec0
DG
1520 rcu_read_unlock();
1521 return;
284d8f55
DG
1522}
1523
1524/*
5b4a0ec0 1525 * Return traceable_app_count
284d8f55 1526 */
5b4a0ec0 1527unsigned long ust_app_list_count(void)
284d8f55 1528{
5b4a0ec0 1529 unsigned long count;
284d8f55 1530
5b4a0ec0 1531 rcu_read_lock();
bec39940 1532 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1533 rcu_read_unlock();
284d8f55 1534
5b4a0ec0 1535 return count;
284d8f55
DG
1536}
1537
5b4a0ec0
DG
1538/*
1539 * Fill events array with all events name of all registered apps.
1540 */
1541int ust_app_list_events(struct lttng_event **events)
421cb601 1542{
5b4a0ec0
DG
1543 int ret, handle;
1544 size_t nbmem, count = 0;
bec39940 1545 struct lttng_ht_iter iter;
5b4a0ec0
DG
1546 struct ust_app *app;
1547 struct lttng_event *tmp;
421cb601 1548
5b4a0ec0
DG
1549 nbmem = UST_APP_EVENT_LIST_SIZE;
1550 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1551 if (tmp == NULL) {
1552 PERROR("zmalloc ust app events");
1553 ret = -ENOMEM;
421cb601
DG
1554 goto error;
1555 }
1556
5b4a0ec0 1557 rcu_read_lock();
421cb601 1558
852d0037 1559 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1560 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1561
86acf0da
DG
1562 health_code_update(&health_thread_cmd);
1563
e0c7ec2b
DG
1564 if (!app->compatible) {
1565 /*
1566 * TODO: In time, we should notice the caller of this error by
1567 * telling him that this is a version error.
1568 */
1569 continue;
1570 }
852d0037 1571 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1572 if (handle < 0) {
1573 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1574 app->pid);
5b4a0ec0
DG
1575 continue;
1576 }
421cb601 1577
852d0037 1578 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
90eaa0d2 1579 &uiter)) != -ENOENT) {
86acf0da 1580 health_code_update(&health_thread_cmd);
815564d8
MD
1581 if (count >= nbmem) {
1582 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1583 2 * nbmem);
1584 nbmem *= 2;
2f221590 1585 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1586 if (tmp == NULL) {
1587 PERROR("realloc ust app events");
1588 ret = -ENOMEM;
1589 goto rcu_error;
1590 }
1591 }
90eaa0d2 1592 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1593 tmp[count].loglevel = uiter.loglevel;
6775595e 1594 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1595 tmp[count].pid = app->pid;
5b4a0ec0
DG
1596 tmp[count].enabled = -1;
1597 count++;
421cb601 1598 }
421cb601
DG
1599 }
1600
5b4a0ec0
DG
1601 ret = count;
1602 *events = tmp;
421cb601 1603
5b4a0ec0 1604 DBG2("UST app list events done (%zu events)", count);
421cb601 1605
5b4a0ec0
DG
1606rcu_error:
1607 rcu_read_unlock();
421cb601 1608error:
86acf0da 1609 health_code_update(&health_thread_cmd);
5b4a0ec0 1610 return ret;
421cb601
DG
1611}
1612
f37d259d
MD
1613/*
1614 * Fill events array with all events name of all registered apps.
1615 */
1616int ust_app_list_event_fields(struct lttng_event_field **fields)
1617{
1618 int ret, handle;
1619 size_t nbmem, count = 0;
1620 struct lttng_ht_iter iter;
1621 struct ust_app *app;
1622 struct lttng_event_field *tmp;
1623
1624 nbmem = UST_APP_EVENT_LIST_SIZE;
1625 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1626 if (tmp == NULL) {
1627 PERROR("zmalloc ust app event fields");
1628 ret = -ENOMEM;
1629 goto error;
1630 }
1631
1632 rcu_read_lock();
1633
1634 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1635 struct lttng_ust_field_iter uiter;
1636
86acf0da
DG
1637 health_code_update(&health_thread_cmd);
1638
f37d259d
MD
1639 if (!app->compatible) {
1640 /*
1641 * TODO: In time, we should notice the caller of this error by
1642 * telling him that this is a version error.
1643 */
1644 continue;
1645 }
1646 handle = ustctl_tracepoint_field_list(app->sock);
1647 if (handle < 0) {
1648 ERR("UST app list event fields getting handle failed for app pid %d",
1649 app->pid);
1650 continue;
1651 }
1652
1653 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
1654 &uiter)) != -ENOENT) {
86acf0da 1655 health_code_update(&health_thread_cmd);
f37d259d
MD
1656 if (count >= nbmem) {
1657 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1658 2 * nbmem);
1659 nbmem *= 2;
1660 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1661 if (tmp == NULL) {
1662 PERROR("realloc ust app event fields");
1663 ret = -ENOMEM;
1664 goto rcu_error;
1665 }
1666 }
f37d259d
MD
1667
1668 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1669 tmp[count].type = uiter.type;
1670
1671 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1672 tmp[count].event.loglevel = uiter.loglevel;
1673 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1674 tmp[count].event.pid = app->pid;
1675 tmp[count].event.enabled = -1;
1676 count++;
1677 }
1678 }
1679
1680 ret = count;
1681 *fields = tmp;
1682
1683 DBG2("UST app list event fields done (%zu events)", count);
1684
1685rcu_error:
1686 rcu_read_unlock();
1687error:
86acf0da 1688 health_code_update(&health_thread_cmd);
f37d259d
MD
1689 return ret;
1690}
1691
5b4a0ec0
DG
1692/*
1693 * Free and clean all traceable apps of the global list.
1694 */
1695void ust_app_clean_list(void)
421cb601 1696{
5b4a0ec0 1697 int ret;
bec39940
DG
1698 struct lttng_ht_iter iter;
1699 struct lttng_ht_node_ulong *node;
421cb601 1700
5b4a0ec0 1701 DBG2("UST app cleaning registered apps hash table");
421cb601 1702
5b4a0ec0 1703 rcu_read_lock();
421cb601 1704
bec39940
DG
1705 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, node, node) {
1706 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1707 assert(!ret);
bec39940 1708 call_rcu(&node->head, delete_ust_app_rcu);
421cb601
DG
1709 }
1710
852d0037
DG
1711 /* Cleanup socket hash table */
1712 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, node, node) {
1713 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1714 assert(!ret);
1715 }
852d0037 1716
bec39940 1717 /* Destroy is done only when the ht is empty */
852d0037
DG
1718 lttng_ht_destroy(ust_app_ht);
1719 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1720
5b4a0ec0
DG
1721 rcu_read_unlock();
1722}
1723
1724/*
1725 * Init UST app hash table.
1726 */
1727void ust_app_ht_alloc(void)
1728{
bec39940 1729 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1730 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1731}
1732
78f0bacd
DG
1733/*
1734 * For a specific UST session, disable the channel for all registered apps.
1735 */
35a9059d 1736int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1737 struct ltt_ust_channel *uchan)
1738{
1739 int ret = 0;
bec39940
DG
1740 struct lttng_ht_iter iter;
1741 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1742 struct ust_app *app;
1743 struct ust_app_session *ua_sess;
8535a6d9 1744 struct ust_app_channel *ua_chan;
78f0bacd
DG
1745
1746 if (usess == NULL || uchan == NULL) {
1747 ERR("Disabling UST global channel with NULL values");
1748 ret = -1;
1749 goto error;
1750 }
1751
a991f516
MD
1752 DBG2("UST app disabling channel %s from global domain for session id %d",
1753 uchan->name, usess->id);
78f0bacd
DG
1754
1755 rcu_read_lock();
1756
1757 /* For every registered applications */
852d0037 1758 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1759 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1760 if (!app->compatible) {
1761 /*
1762 * TODO: In time, we should notice the caller of this error by
1763 * telling him that this is a version error.
1764 */
1765 continue;
1766 }
78f0bacd
DG
1767 ua_sess = lookup_session_by_app(usess, app);
1768 if (ua_sess == NULL) {
1769 continue;
1770 }
1771
8535a6d9 1772 /* Get channel */
bec39940
DG
1773 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1774 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1775 /* If the session if found for the app, the channel must be there */
1776 assert(ua_chan_node);
1777
1778 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1779 /* The channel must not be already disabled */
1780 assert(ua_chan->enabled == 1);
1781
1782 /* Disable channel onto application */
1783 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1784 if (ret < 0) {
1785 /* XXX: We might want to report this error at some point... */
1786 continue;
1787 }
1788 }
1789
1790 rcu_read_unlock();
1791
1792error:
1793 return ret;
1794}
1795
1796/*
1797 * For a specific UST session, enable the channel for all registered apps.
1798 */
35a9059d 1799int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1800 struct ltt_ust_channel *uchan)
1801{
1802 int ret = 0;
bec39940 1803 struct lttng_ht_iter iter;
78f0bacd
DG
1804 struct ust_app *app;
1805 struct ust_app_session *ua_sess;
1806
1807 if (usess == NULL || uchan == NULL) {
1808 ERR("Adding UST global channel to NULL values");
1809 ret = -1;
1810 goto error;
1811 }
1812
a991f516
MD
1813 DBG2("UST app enabling channel %s to global domain for session id %d",
1814 uchan->name, usess->id);
78f0bacd
DG
1815
1816 rcu_read_lock();
1817
1818 /* For every registered applications */
852d0037 1819 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1820 if (!app->compatible) {
1821 /*
1822 * TODO: In time, we should notice the caller of this error by
1823 * telling him that this is a version error.
1824 */
1825 continue;
1826 }
78f0bacd
DG
1827 ua_sess = lookup_session_by_app(usess, app);
1828 if (ua_sess == NULL) {
1829 continue;
1830 }
1831
1832 /* Enable channel onto application */
1833 ret = enable_ust_app_channel(ua_sess, uchan, app);
1834 if (ret < 0) {
1835 /* XXX: We might want to report this error at some point... */
1836 continue;
1837 }
1838 }
1839
1840 rcu_read_unlock();
1841
1842error:
1843 return ret;
1844}
1845
b0a40d28
DG
1846/*
1847 * Disable an event in a channel and for a specific session.
1848 */
35a9059d
DG
1849int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1850 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1851{
1852 int ret = 0;
bec39940
DG
1853 struct lttng_ht_iter iter, uiter;
1854 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1855 struct ust_app *app;
1856 struct ust_app_session *ua_sess;
1857 struct ust_app_channel *ua_chan;
1858 struct ust_app_event *ua_event;
1859
1860 DBG("UST app disabling event %s for all apps in channel "
a991f516 1861 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1862
1863 rcu_read_lock();
1864
1865 /* For all registered applications */
852d0037 1866 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1867 if (!app->compatible) {
1868 /*
1869 * TODO: In time, we should notice the caller of this error by
1870 * telling him that this is a version error.
1871 */
1872 continue;
1873 }
b0a40d28
DG
1874 ua_sess = lookup_session_by_app(usess, app);
1875 if (ua_sess == NULL) {
1876 /* Next app */
1877 continue;
1878 }
1879
1880 /* Lookup channel in the ust app session */
bec39940
DG
1881 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1882 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1883 if (ua_chan_node == NULL) {
a991f516 1884 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1885 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1886 continue;
1887 }
1888 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1889
bec39940
DG
1890 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1891 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1892 if (ua_event_node == NULL) {
1893 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1894 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1895 continue;
1896 }
1897 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1898
7f79d3a1 1899 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1900 if (ret < 0) {
1901 /* XXX: Report error someday... */
1902 continue;
1903 }
1904 }
1905
1906 rcu_read_unlock();
1907
1908 return ret;
1909}
1910
9730260e 1911/*
edb67388 1912 * For a specific UST session and UST channel, the event for all
9730260e
DG
1913 * registered apps.
1914 */
35a9059d 1915int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1916 struct ltt_ust_channel *uchan)
1917{
1918 int ret = 0;
bec39940
DG
1919 struct lttng_ht_iter iter, uiter;
1920 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1921 struct ust_app *app;
1922 struct ust_app_session *ua_sess;
1923 struct ust_app_channel *ua_chan;
1924 struct ust_app_event *ua_event;
1925
1926 DBG("UST app disabling all event for all apps in channel "
a991f516 1927 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1928
1929 rcu_read_lock();
1930
1931 /* For all registered applications */
852d0037 1932 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1933 if (!app->compatible) {
1934 /*
1935 * TODO: In time, we should notice the caller of this error by
1936 * telling him that this is a version error.
1937 */
1938 continue;
1939 }
9730260e 1940 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1941 /* If ua_sess is NULL, there is a code flow error */
1942 assert(ua_sess);
9730260e
DG
1943
1944 /* Lookup channel in the ust app session */
bec39940
DG
1945 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1946 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1947 /* If the channel is not found, there is a code flow error */
1948 assert(ua_chan_node);
1949
9730260e
DG
1950 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1951
1952 /* Disable each events of channel */
bec39940
DG
1953 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1954 node.node) {
7f79d3a1 1955 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1956 if (ret < 0) {
1957 /* XXX: Report error someday... */
1958 continue;
1959 }
1960 }
1961 }
1962
1963 rcu_read_unlock();
1964
1965 return ret;
1966}
1967
421cb601 1968/*
5b4a0ec0 1969 * For a specific UST session, create the channel for all registered apps.
421cb601 1970 */
35a9059d 1971int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1972 struct ltt_ust_channel *uchan)
1973{
bec39940 1974 struct lttng_ht_iter iter;
48842b30
DG
1975 struct ust_app *app;
1976 struct ust_app_session *ua_sess;
1977 struct ust_app_channel *ua_chan;
1978
fc34caaa
DG
1979 /* Very wrong code flow */
1980 assert(usess);
1981 assert(uchan);
421cb601 1982
a991f516
MD
1983 DBG2("UST app adding channel %s to global domain for session id %d",
1984 uchan->name, usess->id);
48842b30
DG
1985
1986 rcu_read_lock();
421cb601 1987
5b4a0ec0 1988 /* For every registered applications */
852d0037 1989 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1990 if (!app->compatible) {
1991 /*
1992 * TODO: In time, we should notice the caller of this error by
1993 * telling him that this is a version error.
1994 */
1995 continue;
1996 }
edb67388
DG
1997 /*
1998 * Create session on the tracer side and add it to app session HT. Note
1999 * that if session exist, it will simply return a pointer to the ust
2000 * app session.
2001 */
421cb601 2002 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2003 if (ua_sess == NULL) {
915d047c 2004 /* The malloc() failed. */
fc34caaa 2005 goto error;
915d047c
DG
2006 } else if (ua_sess == (void *) -1UL) {
2007 /* The application's socket is not valid. Contiuing */
2008 continue;
48842b30
DG
2009 }
2010
421cb601
DG
2011 /* Create channel onto application */
2012 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2013 if (ua_chan == NULL) {
fc34caaa
DG
2014 /* Major problem here and it's maybe the tracer or malloc() */
2015 goto error;
48842b30 2016 }
48842b30 2017 }
5b4a0ec0 2018
48842b30
DG
2019 rcu_read_unlock();
2020
fc34caaa
DG
2021 return 0;
2022
421cb601 2023error:
fc34caaa 2024 return -1;
48842b30
DG
2025}
2026
5b4a0ec0 2027/*
edb67388 2028 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2029 */
35a9059d 2030int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2031 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2032{
2033 int ret = 0;
bec39940
DG
2034 struct lttng_ht_iter iter, uiter;
2035 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
48842b30
DG
2036 struct ust_app *app;
2037 struct ust_app_session *ua_sess;
2038 struct ust_app_channel *ua_chan;
2039 struct ust_app_event *ua_event;
48842b30 2040
a991f516
MD
2041 DBG("UST app enabling event %s for all apps for session id %d",
2042 uevent->attr.name, usess->id);
48842b30 2043
edb67388
DG
2044 /*
2045 * NOTE: At this point, this function is called only if the session and
2046 * channel passed are already created for all apps. and enabled on the
2047 * tracer also.
2048 */
2049
48842b30 2050 rcu_read_lock();
421cb601
DG
2051
2052 /* For all registered applications */
852d0037 2053 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2054 if (!app->compatible) {
2055 /*
2056 * TODO: In time, we should notice the caller of this error by
2057 * telling him that this is a version error.
2058 */
2059 continue;
2060 }
edb67388
DG
2061 ua_sess = lookup_session_by_app(usess, app);
2062 /* If ua_sess is NULL, there is a code flow error */
2063 assert(ua_sess);
ba767faf 2064
edb67388 2065 /* Lookup channel in the ust app session */
bec39940
DG
2066 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2067 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2068 /* If the channel is not found, there is a code flow error */
2069 assert(ua_chan_node);
2070
2071 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2072
bec39940
DG
2073 lttng_ht_lookup(ua_chan->events, (void*)uevent->attr.name, &uiter);
2074 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
35a9059d 2075 if (ua_event_node == NULL) {
7f79d3a1 2076 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2077 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2078 continue;
2079 }
2080 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2081
2082 ret = enable_ust_app_event(ua_sess, ua_event, app);
2083 if (ret < 0) {
7f79d3a1 2084 goto error;
48842b30 2085 }
edb67388
DG
2086 }
2087
7f79d3a1 2088error:
edb67388 2089 rcu_read_unlock();
edb67388
DG
2090 return ret;
2091}
2092
2093/*
2094 * For a specific existing UST session and UST channel, creates the event for
2095 * all registered apps.
2096 */
35a9059d 2097int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2098 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2099{
2100 int ret = 0;
bec39940
DG
2101 struct lttng_ht_iter iter, uiter;
2102 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2103 struct ust_app *app;
2104 struct ust_app_session *ua_sess;
2105 struct ust_app_channel *ua_chan;
2106
a991f516
MD
2107 DBG("UST app creating event %s for all apps for session id %d",
2108 uevent->attr.name, usess->id);
edb67388 2109
edb67388
DG
2110 rcu_read_lock();
2111
2112 /* For all registered applications */
852d0037 2113 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2114 if (!app->compatible) {
2115 /*
2116 * TODO: In time, we should notice the caller of this error by
2117 * telling him that this is a version error.
2118 */
2119 continue;
2120 }
edb67388
DG
2121 ua_sess = lookup_session_by_app(usess, app);
2122 /* If ua_sess is NULL, there is a code flow error */
2123 assert(ua_sess);
48842b30
DG
2124
2125 /* Lookup channel in the ust app session */
bec39940
DG
2126 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2127 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2128 /* If the channel is not found, there is a code flow error */
2129 assert(ua_chan_node);
2130
48842b30
DG
2131 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2132
edb67388
DG
2133 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2134 if (ret < 0) {
fc34caaa
DG
2135 if (ret != -EEXIST) {
2136 /* Possible value at this point: -ENOMEM. If so, we stop! */
2137 break;
2138 }
2139 DBG2("UST app event %s already exist on app PID %d",
852d0037 2140 uevent->attr.name, app->pid);
5b4a0ec0 2141 continue;
48842b30 2142 }
48842b30 2143 }
5b4a0ec0 2144
48842b30
DG
2145 rcu_read_unlock();
2146
2147 return ret;
2148}
2149
5b4a0ec0
DG
2150/*
2151 * Start tracing for a specific UST session and app.
2152 */
421cb601 2153int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2154{
2155 int ret = 0;
bec39940 2156 struct lttng_ht_iter iter;
48842b30
DG
2157 struct ust_app_session *ua_sess;
2158 struct ust_app_channel *ua_chan;
5b4a0ec0 2159 struct ltt_ust_stream *ustream;
173af62f 2160 struct consumer_socket *socket;
48842b30 2161
852d0037 2162 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2163
509cbaf8
MD
2164 rcu_read_lock();
2165
e0c7ec2b
DG
2166 if (!app->compatible) {
2167 goto end;
2168 }
2169
421cb601
DG
2170 ua_sess = lookup_session_by_app(usess, app);
2171 if (ua_sess == NULL) {
509cbaf8 2172 goto error_rcu_unlock;
421cb601 2173 }
48842b30 2174
aea829b3
DG
2175 /* Upon restart, we skip the setup, already done */
2176 if (ua_sess->started) {
8be98f9a 2177 goto skip_setup;
aea829b3 2178 }
8be98f9a 2179
a4b92340
DG
2180 /* Create directories if consumer is LOCAL and has a path defined. */
2181 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2182 strlen(usess->consumer->dst.trace_path) > 0) {
2183 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2184 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2185 if (ret < 0) {
2186 if (ret != -EEXIST) {
2187 ERR("Trace directory creation error");
2188 ret = -1;
2189 goto error_rcu_unlock;
2190 }
2191 }
2192 }
2193
f848c3eb
DG
2194 /* Indicate that the session has been started once */
2195 ua_sess->started = 1;
2196
421cb601
DG
2197 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2198 if (ret < 0) {
f73fabfd 2199 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2200 goto error_rcu_unlock;
421cb601 2201 }
48842b30 2202
421cb601 2203 /* For each channel */
bec39940
DG
2204 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2205 node.node) {
421cb601
DG
2206 /* Create all streams */
2207 while (1) {
5b4a0ec0 2208 /* Create UST stream */
421cb601
DG
2209 ustream = zmalloc(sizeof(*ustream));
2210 if (ustream == NULL) {
2211 PERROR("zmalloc ust stream");
509cbaf8 2212 goto error_rcu_unlock;
421cb601 2213 }
48842b30 2214
4063050c
MD
2215 /* We are going to receive 2 fds, we need to reserve them. */
2216 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2217 if (ret < 0) {
2218 ERR("Exhausted number of available FD upon stream create");
2219 free(ustream);
2220 goto error_rcu_unlock;
2221 }
86acf0da
DG
2222
2223 health_code_update(&health_thread_cmd);
2224
852d0037 2225 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2226 &ustream->obj);
48842b30 2227 if (ret < 0) {
421cb601 2228 /* Got all streams */
4063050c 2229 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2230 free(ustream);
f73fabfd 2231 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2232 break;
48842b30 2233 }
421cb601 2234 ustream->handle = ustream->obj->handle;
48842b30 2235
86acf0da
DG
2236 health_code_update(&health_thread_cmd);
2237
421cb601
DG
2238 /* Order is important */
2239 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675
DG
2240 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
2241 ua_chan->name, ua_chan->streams.count++);
aba8e916
DG
2242 if (ret < 0) {
2243 PERROR("asprintf UST create stream");
a2c0da86
MD
2244 /*
2245 * XXX what should we do here with the
2246 * stream ?
2247 */
421cb601 2248 continue;
aba8e916 2249 }
00e2e675
DG
2250 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2251 ustream->handle);
421cb601 2252 }
86acf0da
DG
2253
2254 health_code_update(&health_thread_cmd);
421cb601 2255 }
aba8e916 2256
7753dea8
MD
2257 switch (app->bits_per_long) {
2258 case 64:
173af62f
DG
2259 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2260 usess->consumer);
2261 if (socket == NULL) {
2262 goto skip_setup;
2263 }
7753dea8
MD
2264 break;
2265 case 32:
173af62f
DG
2266 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2267 usess->consumer);
2268 if (socket == NULL) {
2269 goto skip_setup;
2270 }
7753dea8
MD
2271 break;
2272 default:
2273 ret = -EINVAL;
2274 goto error_rcu_unlock;
2275 }
aea829b3 2276
421cb601 2277 /* Setup UST consumer socket and send fds to it */
173af62f 2278 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2279 if (ret < 0) {
509cbaf8 2280 goto error_rcu_unlock;
421cb601 2281 }
48842b30 2282
86acf0da
DG
2283 health_code_update(&health_thread_cmd);
2284
8be98f9a 2285skip_setup:
421cb601 2286 /* This start the UST tracing */
852d0037 2287 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2288 if (ret < 0) {
852d0037 2289 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2290 goto error_rcu_unlock;
421cb601 2291 }
5b4a0ec0 2292
86acf0da
DG
2293 health_code_update(&health_thread_cmd);
2294
421cb601 2295 /* Quiescent wait after starting trace */
852d0037 2296 ustctl_wait_quiescent(app->sock);
48842b30 2297
e0c7ec2b
DG
2298end:
2299 rcu_read_unlock();
86acf0da 2300 health_code_update(&health_thread_cmd);
421cb601 2301 return 0;
48842b30 2302
509cbaf8
MD
2303error_rcu_unlock:
2304 rcu_read_unlock();
86acf0da 2305 health_code_update(&health_thread_cmd);
421cb601
DG
2306 return -1;
2307}
48842b30 2308
8be98f9a
MD
2309/*
2310 * Stop tracing for a specific UST session and app.
2311 */
2312int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2313{
2314 int ret = 0;
bec39940 2315 struct lttng_ht_iter iter;
8be98f9a 2316 struct ust_app_session *ua_sess;
6d3686da 2317 struct ust_app_channel *ua_chan;
8be98f9a 2318
852d0037 2319 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2320
2321 rcu_read_lock();
2322
e0c7ec2b
DG
2323 if (!app->compatible) {
2324 goto end;
2325 }
2326
8be98f9a
MD
2327 ua_sess = lookup_session_by_app(usess, app);
2328 if (ua_sess == NULL) {
2329 /* Only malloc can failed so something is really wrong */
2330 goto error_rcu_unlock;
2331 }
2332
9bc07046
DG
2333 /*
2334 * If started = 0, it means that stop trace has been called for a session
2335 * that was never started. This is a code flow error and should never
2336 * happen.
2337 */
2338 assert(ua_sess->started == 1);
7db205b5 2339
86acf0da
DG
2340 health_code_update(&health_thread_cmd);
2341
9d6c7d3f 2342 /* This inhibits UST tracing */
852d0037 2343 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2344 if (ret < 0) {
852d0037 2345 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2346 goto error_rcu_unlock;
2347 }
2348
86acf0da
DG
2349 health_code_update(&health_thread_cmd);
2350
9d6c7d3f 2351 /* Quiescent wait after stopping trace */
852d0037 2352 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2353
86acf0da
DG
2354 health_code_update(&health_thread_cmd);
2355
9d6c7d3f 2356 /* Flushing buffers */
bec39940
DG
2357 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2358 node.node) {
86acf0da 2359 health_code_update(&health_thread_cmd);
852d0037 2360 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2361 if (ret < 0) {
7db205b5 2362 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2363 app->pid, ua_chan->name, ret);
6d3686da
DG
2364 /* Continuing flushing all buffers */
2365 continue;
8be98f9a
MD
2366 }
2367 }
8be98f9a 2368
86acf0da
DG
2369 health_code_update(&health_thread_cmd);
2370
90d97d10 2371 /* Flush all buffers before stopping */
852d0037 2372 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2373 if (ret < 0) {
852d0037 2374 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2375 ret);
90d97d10
DG
2376 }
2377
7db205b5
DG
2378end:
2379 rcu_read_unlock();
86acf0da 2380 health_code_update(&health_thread_cmd);
8be98f9a
MD
2381 return 0;
2382
2383error_rcu_unlock:
2384 rcu_read_unlock();
86acf0da 2385 health_code_update(&health_thread_cmd);
8be98f9a
MD
2386 return -1;
2387}
2388
84cd17c6
MD
2389/*
2390 * Destroy a specific UST session in apps.
2391 */
2392int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2393{
2394 struct ust_app_session *ua_sess;
2395 struct lttng_ust_object_data obj;
bec39940
DG
2396 struct lttng_ht_iter iter;
2397 struct lttng_ht_node_ulong *node;
525b0740 2398 int ret;
84cd17c6 2399
852d0037 2400 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2401
2402 rcu_read_lock();
2403
e0c7ec2b
DG
2404 if (!app->compatible) {
2405 goto end;
2406 }
2407
84cd17c6 2408 __lookup_session_by_app(usess, app, &iter);
bec39940 2409 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2410 if (node == NULL) {
2411 /* Only malloc can failed so something is really wrong */
2412 goto error_rcu_unlock;
2413 }
2414 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2415 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2416 assert(!ret);
84cd17c6
MD
2417 obj.handle = ua_sess->handle;
2418 obj.shm_fd = -1;
2419 obj.wait_fd = -1;
2420 obj.memory_map_size = 0;
86acf0da 2421 health_code_update(&health_thread_cmd);
852d0037 2422 ustctl_release_object(app->sock, &obj);
84cd17c6 2423
86acf0da 2424 health_code_update(&health_thread_cmd);
852d0037 2425 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2426
84cd17c6 2427 /* Quiescent wait after stopping trace */
852d0037 2428 ustctl_wait_quiescent(app->sock);
84cd17c6 2429
e0c7ec2b
DG
2430end:
2431 rcu_read_unlock();
86acf0da 2432 health_code_update(&health_thread_cmd);
84cd17c6
MD
2433 return 0;
2434
2435error_rcu_unlock:
2436 rcu_read_unlock();
86acf0da 2437 health_code_update(&health_thread_cmd);
84cd17c6
MD
2438 return -1;
2439}
2440
5b4a0ec0
DG
2441/*
2442 * Start tracing for the UST session.
2443 */
421cb601
DG
2444int ust_app_start_trace_all(struct ltt_ust_session *usess)
2445{
2446 int ret = 0;
bec39940 2447 struct lttng_ht_iter iter;
421cb601 2448 struct ust_app *app;
48842b30 2449
421cb601
DG
2450 DBG("Starting all UST traces");
2451
2452 rcu_read_lock();
421cb601 2453
852d0037 2454 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2455 ret = ust_app_start_trace(usess, app);
48842b30 2456 if (ret < 0) {
5b4a0ec0
DG
2457 /* Continue to next apps even on error */
2458 continue;
48842b30 2459 }
48842b30 2460 }
5b4a0ec0 2461
48842b30
DG
2462 rcu_read_unlock();
2463
2464 return 0;
2465}
487cf67c 2466
8be98f9a
MD
2467/*
2468 * Start tracing for the UST session.
2469 */
2470int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2471{
2472 int ret = 0;
bec39940 2473 struct lttng_ht_iter iter;
8be98f9a
MD
2474 struct ust_app *app;
2475
2476 DBG("Stopping all UST traces");
2477
2478 rcu_read_lock();
2479
852d0037 2480 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2481 ret = ust_app_stop_trace(usess, app);
2482 if (ret < 0) {
2483 /* Continue to next apps even on error */
2484 continue;
2485 }
2486 }
2487
2488 rcu_read_unlock();
2489
2490 return 0;
2491}
2492
84cd17c6
MD
2493/*
2494 * Destroy app UST session.
2495 */
2496int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2497{
2498 int ret = 0;
bec39940 2499 struct lttng_ht_iter iter;
84cd17c6
MD
2500 struct ust_app *app;
2501
2502 DBG("Destroy all UST traces");
2503
2504 rcu_read_lock();
2505
852d0037 2506 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2507 ret = ust_app_destroy_trace(usess, app);
2508 if (ret < 0) {
2509 /* Continue to next apps even on error */
2510 continue;
2511 }
2512 }
2513
2514 rcu_read_unlock();
2515
2516 return 0;
2517}
2518
5b4a0ec0
DG
2519/*
2520 * Add channels/events from UST global domain to registered apps at sock.
2521 */
487cf67c
DG
2522void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2523{
55c54cce 2524 int ret = 0;
727d5404 2525 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2526 struct ust_app *app;
2527 struct ust_app_session *ua_sess;
2528 struct ust_app_channel *ua_chan;
2529 struct ust_app_event *ua_event;
727d5404 2530 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2531
2532 if (usess == NULL) {
5b4a0ec0 2533 ERR("No UST session on global update. Returning");
1f3580c7
DG
2534 goto error;
2535 }
2536
a991f516
MD
2537 DBG2("UST app global update for app sock %d for session id %d", sock,
2538 usess->id);
487cf67c 2539
284d8f55
DG
2540 rcu_read_lock();
2541
487cf67c
DG
2542 app = find_app_by_sock(sock);
2543 if (app == NULL) {
2544 ERR("Failed to update app sock %d", sock);
2545 goto error;
2546 }
2547
e0c7ec2b
DG
2548 if (!app->compatible) {
2549 goto error;
2550 }
2551
421cb601 2552 ua_sess = create_ust_app_session(usess, app);
487cf67c 2553 if (ua_sess == NULL) {
487cf67c
DG
2554 goto error;
2555 }
2556
284d8f55
DG
2557 /*
2558 * We can iterate safely here over all UST app session sicne the create ust
2559 * app session above made a shadow copy of the UST global domain from the
2560 * ltt ust session.
2561 */
bec39940
DG
2562 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2563 node.node) {
284d8f55
DG
2564 ret = create_ust_channel(app, ua_sess, ua_chan);
2565 if (ret < 0) {
2566 /* FIXME: Should we quit here or continue... */
2567 continue;
487cf67c
DG
2568 }
2569
727d5404
DG
2570 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2571 node.node) {
2572 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2573 if (ret < 0) {
2574 /* FIXME: Should we quit here or continue... */
2575 continue;
2576 }
2577 }
2578
2579
284d8f55 2580 /* For each events */
bec39940
DG
2581 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2582 node.node) {
284d8f55
DG
2583 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2584 if (ret < 0) {
2585 /* FIXME: Should we quit here or continue... */
2586 continue;
487cf67c 2587 }
727d5404
DG
2588
2589 /* Add context on events. */
2590 cds_lfht_for_each_entry(ua_event->ctx->ht, &iter_ctx.iter,
2591 ua_ctx, node.node) {
2592 ret = create_ust_event_context(ua_event, ua_ctx, app);
2593 if (ret < 0) {
2594 /* FIXME: Should we quit here or continue... */
2595 continue;
2596 }
2597 }
53a80697
MD
2598 ret = set_ust_event_filter(ua_event, app);
2599 if (ret < 0) {
2600 /* FIXME: Should we quit here or continue... */
2601 continue;
2602 }
36dc12cc 2603 }
487cf67c
DG
2604 }
2605
36dc12cc 2606 if (usess->start_trace) {
421cb601 2607 ret = ust_app_start_trace(usess, app);
36dc12cc 2608 if (ret < 0) {
36dc12cc
DG
2609 goto error;
2610 }
2611
852d0037 2612 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2613 }
2614
487cf67c
DG
2615error:
2616 rcu_read_unlock();
2617 return;
2618}
55cc08a6
DG
2619
2620/*
2621 * Add context to a specific channel for global UST domain.
2622 */
2623int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2624 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2625{
2626 int ret = 0;
bec39940
DG
2627 struct lttng_ht_node_str *ua_chan_node;
2628 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2629 struct ust_app_channel *ua_chan = NULL;
2630 struct ust_app_session *ua_sess;
2631 struct ust_app *app;
2632
2633 rcu_read_lock();
2634
852d0037 2635 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2636 if (!app->compatible) {
2637 /*
2638 * TODO: In time, we should notice the caller of this error by
2639 * telling him that this is a version error.
2640 */
2641 continue;
2642 }
55cc08a6
DG
2643 ua_sess = lookup_session_by_app(usess, app);
2644 if (ua_sess == NULL) {
2645 continue;
2646 }
2647
2648 /* Lookup channel in the ust app session */
bec39940
DG
2649 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2650 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2651 if (ua_chan_node == NULL) {
2652 continue;
2653 }
2654 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2655 node);
2656
2657 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2658 if (ret < 0) {
2659 continue;
2660 }
2661 }
2662
55cc08a6
DG
2663 rcu_read_unlock();
2664 return ret;
2665}
2666
2667/*
2668 * Add context to a specific event in a channel for global UST domain.
2669 */
2670int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2671 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2672 struct ltt_ust_context *uctx)
2673{
2674 int ret = 0;
bec39940
DG
2675 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2676 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2677 struct ust_app_session *ua_sess;
2678 struct ust_app_event *ua_event;
2679 struct ust_app_channel *ua_chan = NULL;
2680 struct ust_app *app;
2681
2682 rcu_read_lock();
2683
852d0037 2684 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2685 if (!app->compatible) {
2686 /*
2687 * TODO: In time, we should notice the caller of this error by
2688 * telling him that this is a version error.
2689 */
2690 continue;
2691 }
55cc08a6
DG
2692 ua_sess = lookup_session_by_app(usess, app);
2693 if (ua_sess == NULL) {
2694 continue;
2695 }
2696
2697 /* Lookup channel in the ust app session */
bec39940
DG
2698 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2699 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2700 if (ua_chan_node == NULL) {
2701 continue;
2702 }
2703 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2704 node);
2705
bec39940
DG
2706 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2707 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2708 if (ua_event_node == NULL) {
2709 continue;
2710 }
2711 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2712 node);
2713
2714 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2715 if (ret < 0) {
2716 continue;
2717 }
2718 }
2719
55cc08a6
DG
2720 rcu_read_unlock();
2721 return ret;
2722}
76d45b40 2723
53a80697
MD
2724/*
2725 * Add context to a specific event in a channel for global UST domain.
2726 */
2727int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2728 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2729 struct lttng_filter_bytecode *bytecode)
2730{
2731 int ret = 0;
2732 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
2733 struct lttng_ht_iter iter, uiter;
2734 struct ust_app_session *ua_sess;
2735 struct ust_app_event *ua_event;
2736 struct ust_app_channel *ua_chan = NULL;
2737 struct ust_app *app;
2738
2739 rcu_read_lock();
2740
2741 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2742 if (!app->compatible) {
2743 /*
2744 * TODO: In time, we should notice the caller of this error by
2745 * telling him that this is a version error.
2746 */
2747 continue;
2748 }
2749 ua_sess = lookup_session_by_app(usess, app);
2750 if (ua_sess == NULL) {
2751 continue;
2752 }
2753
2754 /* Lookup channel in the ust app session */
2755 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2756 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2757 if (ua_chan_node == NULL) {
2758 continue;
2759 }
2760 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2761 node);
2762
2763 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
2764 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
2765 if (ua_event_node == NULL) {
2766 continue;
2767 }
2768 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2769 node);
2770
2771 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2772 if (ret < 0) {
2773 continue;
2774 }
2775 }
2776
2777 rcu_read_unlock();
2778 return ret;
2779}
2780
76d45b40
DG
2781/*
2782 * Enable event for a channel from a UST session for a specific PID.
2783 */
2784int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2785 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2786{
2787 int ret = 0;
bec39940
DG
2788 struct lttng_ht_iter iter;
2789 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
76d45b40
DG
2790 struct ust_app *app;
2791 struct ust_app_session *ua_sess;
2792 struct ust_app_channel *ua_chan;
2793 struct ust_app_event *ua_event;
2794
2795 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2796
2797 rcu_read_lock();
2798
2799 app = ust_app_find_by_pid(pid);
2800 if (app == NULL) {
2801 ERR("UST app enable event per PID %d not found", pid);
2802 ret = -1;
2803 goto error;
2804 }
2805
e0c7ec2b
DG
2806 if (!app->compatible) {
2807 ret = 0;
2808 goto error;
2809 }
2810
76d45b40
DG
2811 ua_sess = lookup_session_by_app(usess, app);
2812 /* If ua_sess is NULL, there is a code flow error */
2813 assert(ua_sess);
2814
2815 /* Lookup channel in the ust app session */
bec39940
DG
2816 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2817 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2818 /* If the channel is not found, there is a code flow error */
2819 assert(ua_chan_node);
2820
2821 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2822
bec39940
DG
2823 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2824 ua_event_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2825 if (ua_event_node == NULL) {
2826 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2827 if (ret < 0) {
2828 goto error;
2829 }
2830 } else {
2831 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2832
2833 ret = enable_ust_app_event(ua_sess, ua_event, app);
2834 if (ret < 0) {
2835 goto error;
2836 }
2837 }
2838
2839error:
2840 rcu_read_unlock();
2841 return ret;
2842}
7f79d3a1
DG
2843
2844/*
2845 * Disable event for a channel from a UST session for a specific PID.
2846 */
2847int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2848 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2849{
2850 int ret = 0;
bec39940
DG
2851 struct lttng_ht_iter iter;
2852 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2853 struct ust_app *app;
2854 struct ust_app_session *ua_sess;
2855 struct ust_app_channel *ua_chan;
2856 struct ust_app_event *ua_event;
2857
2858 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2859
2860 rcu_read_lock();
2861
2862 app = ust_app_find_by_pid(pid);
2863 if (app == NULL) {
2864 ERR("UST app disable event per PID %d not found", pid);
2865 ret = -1;
2866 goto error;
2867 }
2868
e0c7ec2b
DG
2869 if (!app->compatible) {
2870 ret = 0;
2871 goto error;
2872 }
2873
7f79d3a1
DG
2874 ua_sess = lookup_session_by_app(usess, app);
2875 /* If ua_sess is NULL, there is a code flow error */
2876 assert(ua_sess);
2877
2878 /* Lookup channel in the ust app session */
bec39940
DG
2879 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2880 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2881 if (ua_chan_node == NULL) {
2882 /* Channel does not exist, skip disabling */
2883 goto error;
2884 }
2885 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2886
bec39940
DG
2887 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2888 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2889 if (ua_event_node == NULL) {
2890 /* Event does not exist, skip disabling */
2891 goto error;
2892 }
2893 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2894
2895 ret = disable_ust_app_event(ua_sess, ua_event, app);
2896 if (ret < 0) {
2897 goto error;
2898 }
2899
2900error:
2901 rcu_read_unlock();
2902 return ret;
2903}
e0c7ec2b
DG
2904
2905/*
2906 * Validate version of UST apps and set the compatible bit.
2907 */
2908int ust_app_validate_version(int sock)
2909{
2910 int ret;
2911 struct ust_app *app;
2912
2913 rcu_read_lock();
2914
2915 app = find_app_by_sock(sock);
2916 assert(app);
2917
86acf0da
DG
2918 health_code_update(&health_thread_cmd);
2919
e0c7ec2b
DG
2920 ret = ustctl_tracer_version(sock, &app->version);
2921 if (ret < 0) {
2922 goto error;
2923 }
2924
2925 /* Validate version */
aee0cea0 2926 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2927 goto error;
2928 }
2929
68264071 2930 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2931 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2932 UST_APP_MAJOR_VERSION);
2933 app->compatible = 1;
2934 rcu_read_unlock();
86acf0da 2935 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2936 return 0;
2937
2938error:
68264071 2939 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2940 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2941 UST_APP_MAJOR_VERSION);
2942 app->compatible = 0;
2943 rcu_read_unlock();
86acf0da 2944 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2945 return -1;
2946}
4466912f
DG
2947
2948/*
2949 * Calibrate registered applications.
2950 */
2951int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2952{
2953 int ret = 0;
2954 struct lttng_ht_iter iter;
2955 struct ust_app *app;
2956
2957 rcu_read_lock();
2958
852d0037 2959 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2960 if (!app->compatible) {
2961 /*
2962 * TODO: In time, we should notice the caller of this error by
2963 * telling him that this is a version error.
2964 */
2965 continue;
2966 }
2967
86acf0da
DG
2968 health_code_update(&health_thread_cmd);
2969
852d0037 2970 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2971 if (ret < 0) {
2972 switch (ret) {
2973 case -ENOSYS:
2974 /* Means that it's not implemented on the tracer side. */
2975 ret = 0;
2976 break;
2977 default:
2978 /* TODO: Report error to user */
2979 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2980 app->pid, ret);
4466912f
DG
2981 break;
2982 }
2983 }
2984 }
2985
2986 DBG("UST app global domain calibration finished");
2987
2988 rcu_read_unlock();
2989
86acf0da
DG
2990 health_code_update(&health_thread_cmd);
2991
4466912f
DG
2992 return ret;
2993}
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