Change the UST event hash table match function
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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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>
fb54cdbf 28#include <lttng/ust-error.h>
bec39940 29
990570ed 30#include <common/common.h>
86acf0da 31#include <common/sessiond-comm/sessiond-comm.h>
1e307fab 32
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33#include "fd-limit.h"
34#include "health.h"
56fff090 35#include "ust-app.h"
48842b30 36#include "ust-consumer.h"
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37#include "ust-ctl.h"
38
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39static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
40{
41 struct ust_app_event *event;
42 const struct ust_app_ht_key *key;
43
44 assert(node);
45 assert(_key);
46
47 event = caa_container_of(node, struct ust_app_event, node.node);
48 key = _key;
49
50 /* Match the 3 elements of the key: name, filter and loglevel. */
51
52 /* Event name */
53 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
54 goto no_match;
55 }
56
57 /* Event loglevel. */
58 if (event->attr.loglevel != key->loglevel) {
59 goto no_match;
60 }
61
62 /* One of the filters is NULL, fail. */
63 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
64 goto no_match;
65 }
66
67 /* Both filters are NULL, success. */
68 if (!key->filter && !event->filter) {
69 goto match;
70 }
71
72 /* Both filters exists, check length followed by the bytecode. */
73 if (event->filter->len == key->filter->len &&
74 memcmp(event->filter->data, key->filter->data,
75 event->filter->len) == 0) {
76 goto match;
77 }
78
79match:
80 return 1;
81
82no_match:
83 return 0;
84
85}
86
87static void add_unique_ust_app_event(struct lttng_ht *ht,
88 struct ust_app_event *event)
89{
90 struct cds_lfht_node *node_ptr;
91 struct ust_app_ht_key key;
92
93 assert(ht);
94 assert(ht->ht);
95 assert(event);
96
97 key.name = event->attr.name;
98 key.filter = event->filter;
99 key.loglevel = event->attr.loglevel;
100
101 node_ptr = cds_lfht_add_unique(ht->ht,
102 ht->hash_fct(event->node.key, lttng_ht_seed),
103 ht_match_ust_app_event, &key, &event->node.node);
104 assert(node_ptr == &event->node.node);
105}
106
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107/*
108 * Delete ust context safely. RCU read lock must be held before calling
109 * this function.
110 */
111static
112void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
113{
114 if (ua_ctx->obj) {
115 ustctl_release_object(sock, ua_ctx->obj);
116 free(ua_ctx->obj);
117 }
118 free(ua_ctx);
119}
120
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121/*
122 * Delete ust app event safely. RCU read lock must be held before calling
123 * this function.
124 */
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125static
126void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 127{
53a80697 128 free(ua_event->filter);
d80a6244 129
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130 if (ua_event->obj != NULL) {
131 ustctl_release_object(sock, ua_event->obj);
132 free(ua_event->obj);
133 }
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134 free(ua_event);
135}
136
137/*
138 * Delete ust app stream safely. RCU read lock must be held before calling
139 * this function.
140 */
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141static
142void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 143{
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144 if (stream->obj) {
145 ustctl_release_object(sock, stream->obj);
4063050c 146 lttng_fd_put(LTTNG_FD_APPS, 2);
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147 free(stream->obj);
148 }
84cd17c6 149 free(stream);
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150}
151
152/*
153 * Delete ust app channel safely. RCU read lock must be held before calling
154 * this function.
155 */
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156static
157void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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158{
159 int ret;
bec39940 160 struct lttng_ht_iter iter;
d80a6244 161 struct ust_app_event *ua_event;
55cc08a6 162 struct ust_app_ctx *ua_ctx;
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163 struct ltt_ust_stream *stream, *stmp;
164
55cc08a6 165 /* Wipe stream */
d80a6244 166 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 167 cds_list_del(&stream->list);
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168 delete_ust_app_stream(sock, stream);
169 }
170
55cc08a6 171 /* Wipe context */
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172 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
173 ret = lttng_ht_del(ua_chan->ctx, &iter);
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174 assert(!ret);
175 delete_ust_app_ctx(sock, ua_ctx);
176 }
bec39940 177 lttng_ht_destroy(ua_chan->ctx);
d80a6244 178
55cc08a6 179 /* Wipe events */
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180 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
181 node.node) {
182 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 183 assert(!ret);
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184 delete_ust_app_event(sock, ua_event);
185 }
bec39940 186 lttng_ht_destroy(ua_chan->events);
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187
188 if (ua_chan->obj != NULL) {
189 ustctl_release_object(sock, ua_chan->obj);
4063050c 190 lttng_fd_put(LTTNG_FD_APPS, 2);
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191 free(ua_chan->obj);
192 }
84cd17c6 193 free(ua_chan);
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194}
195
196/*
197 * Delete ust app session safely. RCU read lock must be held before calling
198 * this function.
199 */
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200static
201void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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202{
203 int ret;
bec39940 204 struct lttng_ht_iter iter;
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205 struct ust_app_channel *ua_chan;
206
207 if (ua_sess->metadata) {
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208 if (ua_sess->metadata->stream_obj) {
209 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
4063050c 210 lttng_fd_put(LTTNG_FD_APPS, 2);
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211 free(ua_sess->metadata->stream_obj);
212 }
213 if (ua_sess->metadata->obj) {
214 ustctl_release_object(sock, ua_sess->metadata->obj);
4063050c 215 lttng_fd_put(LTTNG_FD_APPS, 2);
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216 free(ua_sess->metadata->obj);
217 }
a2c0da86 218 trace_ust_destroy_metadata(ua_sess->metadata);
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219 }
220
bec39940
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221 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
222 node.node) {
223 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 224 assert(!ret);
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225 delete_ust_app_channel(sock, ua_chan);
226 }
bec39940 227 lttng_ht_destroy(ua_sess->channels);
d80a6244 228
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MD
229 if (ua_sess->handle != -1) {
230 ustctl_release_handle(sock, ua_sess->handle);
231 }
8b366481 232 free(ua_sess);
d80a6244 233}
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234
235/*
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236 * Delete a traceable application structure from the global list. Never call
237 * this function outside of a call_rcu call.
91d76f53 238 */
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239static
240void delete_ust_app(struct ust_app *app)
91d76f53 241{
8b366481 242 int ret, sock;
bec39940 243 struct lttng_ht_iter iter;
284d8f55 244 struct ust_app_session *ua_sess;
44d3bd01 245
f6a9efaa 246 rcu_read_lock();
44d3bd01 247
d80a6244 248 /* Delete ust app sessions info */
852d0037
DG
249 sock = app->sock;
250 app->sock = -1;
d80a6244 251
8b366481 252 /* Wipe sessions */
bec39940
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253 cds_lfht_for_each_entry(app->sessions->ht, &iter.iter, ua_sess,
254 node.node) {
255 ret = lttng_ht_del(app->sessions, &iter);
525b0740 256 assert(!ret);
852d0037 257 delete_ust_app_session(app->sock, ua_sess);
d80a6244 258 }
bec39940 259 lttng_ht_destroy(app->sessions);
d80a6244 260
6414a713 261 /*
852d0037
DG
262 * Wait until we have deleted the application from the sock hash table
263 * before closing this socket, otherwise an application could re-use the
264 * socket ID and race with the teardown, using the same hash table entry.
265 *
266 * It's OK to leave the close in call_rcu. We want it to stay unique for
267 * all RCU readers that could run concurrently with unregister app,
268 * therefore we _need_ to only close that socket after a grace period. So
269 * it should stay in this RCU callback.
270 *
271 * This close() is a very important step of the synchronization model so
272 * every modification to this function must be carefully reviewed.
6414a713 273 */
799e2c4f
MD
274 ret = close(sock);
275 if (ret) {
276 PERROR("close");
277 }
4063050c 278 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 279
852d0037 280 DBG2("UST app pid %d deleted", app->pid);
284d8f55 281 free(app);
bec39940 282
f6a9efaa 283 rcu_read_unlock();
099e26bd
DG
284}
285
286/*
f6a9efaa 287 * URCU intermediate call to delete an UST app.
099e26bd 288 */
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289static
290void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 291{
bec39940
DG
292 struct lttng_ht_node_ulong *node =
293 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 294 struct ust_app *app =
852d0037 295 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 296
852d0037 297 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 298 delete_ust_app(app);
099e26bd
DG
299}
300
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301/*
302 * Alloc new UST app session.
303 */
304static
305struct ust_app_session *alloc_ust_app_session(void)
306{
307 struct ust_app_session *ua_sess;
308
309 /* Init most of the default value by allocating and zeroing */
310 ua_sess = zmalloc(sizeof(struct ust_app_session));
311 if (ua_sess == NULL) {
312 PERROR("malloc");
313 goto error;
314 }
315
316 ua_sess->handle = -1;
bec39940 317 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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318
319 return ua_sess;
320
321error:
322 return NULL;
323}
324
325/*
326 * Alloc new UST app channel.
327 */
328static
329struct ust_app_channel *alloc_ust_app_channel(char *name,
330 struct lttng_ust_channel *attr)
331{
332 struct ust_app_channel *ua_chan;
333
334 /* Init most of the default value by allocating and zeroing */
335 ua_chan = zmalloc(sizeof(struct ust_app_channel));
336 if (ua_chan == NULL) {
337 PERROR("malloc");
338 goto error;
339 }
340
341 /* Setup channel name */
342 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
343 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
344
345 ua_chan->enabled = 1;
346 ua_chan->handle = -1;
bec39940
DG
347 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
348 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
349 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
8b366481
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350
351 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
352
353 /* Copy attributes */
354 if (attr) {
355 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
356 }
357
358 DBG3("UST app channel %s allocated", ua_chan->name);
359
360 return ua_chan;
361
362error:
363 return NULL;
364}
365
366/*
367 * Alloc new UST app event.
368 */
369static
370struct ust_app_event *alloc_ust_app_event(char *name,
371 struct lttng_ust_event *attr)
372{
373 struct ust_app_event *ua_event;
374
375 /* Init most of the default value by allocating and zeroing */
376 ua_event = zmalloc(sizeof(struct ust_app_event));
377 if (ua_event == NULL) {
378 PERROR("malloc");
379 goto error;
380 }
381
382 ua_event->enabled = 1;
383 strncpy(ua_event->name, name, sizeof(ua_event->name));
384 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 385 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
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386
387 /* Copy attributes */
388 if (attr) {
389 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
390 }
391
392 DBG3("UST app event %s allocated", ua_event->name);
393
394 return ua_event;
395
396error:
397 return NULL;
398}
399
400/*
401 * Alloc new UST app context.
402 */
403static
404struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
405{
406 struct ust_app_ctx *ua_ctx;
407
408 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
409 if (ua_ctx == NULL) {
410 goto error;
411 }
412
413 if (uctx) {
414 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
415 }
416
417 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
418
419error:
420 return ua_ctx;
421}
422
099e26bd 423/*
421cb601
DG
424 * Find an ust_app using the sock and return it. RCU read side lock must be
425 * held before calling this helper function.
099e26bd 426 */
8b366481
DG
427static
428struct ust_app *find_app_by_sock(int sock)
099e26bd 429{
bec39940 430 struct lttng_ht_node_ulong *node;
bec39940 431 struct lttng_ht_iter iter;
f6a9efaa 432
852d0037 433 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 434 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
435 if (node == NULL) {
436 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
437 goto error;
438 }
852d0037
DG
439
440 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
441
442error:
443 return NULL;
099e26bd
DG
444}
445
18eace3b
DG
446static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
447 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
448{
449 struct lttng_ht_iter iter;
450 struct lttng_ht_node_str *node;
451 struct ust_app_event *event = NULL;
452 struct ust_app_ht_key key;
453 void *orig_match_fct;
454
455 assert(name);
456 assert(ht);
457
458 /* Setup key for event lookup. */
459 key.name = name;
460 key.filter = filter;
461 key.loglevel = loglevel;
462
463 /* Save match function so we can use the ust app event match. */
464 orig_match_fct = (void *) ht->match_fct;
465 ht->match_fct = ht_match_ust_app_event;
466
467 lttng_ht_lookup(ht, (void *) &key, &iter);
468 node = lttng_ht_iter_get_node_str(&iter);
469 if (node == NULL) {
470 goto end;
471 }
472
473 event = caa_container_of(node, struct ust_app_event, node);
474
475end:
476 /* Put back original match function. */
477 ht->match_fct = orig_match_fct;
478 return event;
479}
480
55cc08a6
DG
481/*
482 * Create the channel context on the tracer.
483 */
484static
485int create_ust_channel_context(struct ust_app_channel *ua_chan,
486 struct ust_app_ctx *ua_ctx, struct ust_app *app)
487{
488 int ret;
489
86acf0da
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490 health_code_update(&health_thread_cmd);
491
852d0037 492 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
493 ua_chan->obj, &ua_ctx->obj);
494 if (ret < 0) {
495 goto error;
496 }
497
498 ua_ctx->handle = ua_ctx->obj->handle;
499
727d5404 500 DBG2("UST app context created successfully for channel %s", ua_chan->name);
55cc08a6
DG
501
502error:
86acf0da 503 health_code_update(&health_thread_cmd);
55cc08a6
DG
504 return ret;
505}
506
53a80697
MD
507/*
508 * Set the filter on the tracer.
509 */
510static
511int set_ust_event_filter(struct ust_app_event *ua_event,
512 struct ust_app *app)
513{
514 int ret;
515
86acf0da
DG
516 health_code_update(&health_thread_cmd);
517
53a80697 518 if (!ua_event->filter) {
86acf0da
DG
519 ret = 0;
520 goto error;
53a80697
MD
521 }
522
523 ret = ustctl_set_filter(app->sock, ua_event->filter,
524 ua_event->obj);
525 if (ret < 0) {
526 goto error;
527 }
528
529 DBG2("UST filter set successfully for event %s", ua_event->name);
530
531error:
86acf0da 532 health_code_update(&health_thread_cmd);
53a80697
MD
533 return ret;
534}
535
9730260e
DG
536/*
537 * Disable the specified event on to UST tracer for the UST session.
538 */
539static int disable_ust_event(struct ust_app *app,
540 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
541{
542 int ret;
543
86acf0da
DG
544 health_code_update(&health_thread_cmd);
545
852d0037 546 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e
DG
547 if (ret < 0) {
548 ERR("UST app event %s disable failed for app (pid: %d) "
549 "and session handle %d with ret %d",
852d0037 550 ua_event->attr.name, app->pid, ua_sess->handle, ret);
9730260e
DG
551 goto error;
552 }
553
554 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 555 ua_event->attr.name, app->pid);
9730260e
DG
556
557error:
86acf0da 558 health_code_update(&health_thread_cmd);
9730260e
DG
559 return ret;
560}
561
78f0bacd
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562/*
563 * Disable the specified channel on to UST tracer for the UST session.
564 */
565static int disable_ust_channel(struct ust_app *app,
566 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
567{
568 int ret;
569
86acf0da
DG
570 health_code_update(&health_thread_cmd);
571
852d0037 572 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
DG
573 if (ret < 0) {
574 ERR("UST app channel %s disable failed for app (pid: %d) "
575 "and session handle %d with ret %d",
852d0037 576 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
577 goto error;
578 }
579
78f0bacd 580 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 581 ua_chan->name, app->pid);
78f0bacd
DG
582
583error:
86acf0da 584 health_code_update(&health_thread_cmd);
78f0bacd
DG
585 return ret;
586}
587
588/*
589 * Enable the specified channel on to UST tracer for the UST session.
590 */
591static int enable_ust_channel(struct ust_app *app,
592 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
593{
594 int ret;
595
86acf0da
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596 health_code_update(&health_thread_cmd);
597
852d0037 598 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd
DG
599 if (ret < 0) {
600 ERR("UST app channel %s enable failed for app (pid: %d) "
601 "and session handle %d with ret %d",
852d0037 602 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
603 goto error;
604 }
605
606 ua_chan->enabled = 1;
607
608 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 609 ua_chan->name, app->pid);
78f0bacd
DG
610
611error:
86acf0da 612 health_code_update(&health_thread_cmd);
78f0bacd
DG
613 return ret;
614}
615
edb67388
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616/*
617 * Enable the specified event on to UST tracer for the UST session.
618 */
619static int enable_ust_event(struct ust_app *app,
620 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
621{
622 int ret;
623
86acf0da
DG
624 health_code_update(&health_thread_cmd);
625
852d0037 626 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388
DG
627 if (ret < 0) {
628 ERR("UST app event %s enable failed for app (pid: %d) "
629 "and session handle %d with ret %d",
852d0037 630 ua_event->attr.name, app->pid, ua_sess->handle, ret);
edb67388
DG
631 goto error;
632 }
633
634 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 635 ua_event->attr.name, app->pid);
edb67388
DG
636
637error:
86acf0da 638 health_code_update(&health_thread_cmd);
edb67388
DG
639 return ret;
640}
641
099e26bd 642/*
5b4a0ec0 643 * Open metadata onto the UST tracer for a UST session.
0177d773 644 */
5b4a0ec0
DG
645static int open_ust_metadata(struct ust_app *app,
646 struct ust_app_session *ua_sess)
0177d773 647{
5b4a0ec0
DG
648 int ret;
649 struct lttng_ust_channel_attr uattr;
0177d773 650
86acf0da
DG
651 health_code_update(&health_thread_cmd);
652
5b4a0ec0
DG
653 uattr.overwrite = ua_sess->metadata->attr.overwrite;
654 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
655 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
656 uattr.switch_timer_interval =
657 ua_sess->metadata->attr.switch_timer_interval;
658 uattr.read_timer_interval =
659 ua_sess->metadata->attr.read_timer_interval;
660 uattr.output = ua_sess->metadata->attr.output;
661
4063050c
MD
662 /* We are going to receive 2 fds, we need to reserve them. */
663 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
664 if (ret < 0) {
665 ERR("Exhausted number of available FD upon metadata open");
666 goto error;
667 }
5b4a0ec0 668 /* UST tracer metadata creation */
852d0037 669 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
670 &ua_sess->metadata->obj);
671 if (ret < 0) {
fc34caaa 672 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 673 app->pid, ret);
f6a9efaa 674 goto error;
0177d773 675 }
f6a9efaa 676
6d3686da
DG
677 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
678
f6a9efaa 679error:
86acf0da 680 health_code_update(&health_thread_cmd);
5b4a0ec0 681 return ret;
91d76f53
DG
682}
683
684/*
5b4a0ec0 685 * Create stream onto the UST tracer for a UST session.
91d76f53 686 */
5b4a0ec0
DG
687static int create_ust_stream(struct ust_app *app,
688 struct ust_app_session *ua_sess)
91d76f53 689{
5b4a0ec0 690 int ret;
421cb601 691
86acf0da
DG
692 health_code_update(&health_thread_cmd);
693
4063050c
MD
694 /* We are going to receive 2 fds, we need to reserve them. */
695 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
696 if (ret < 0) {
697 ERR("Exhausted number of available FD upon metadata stream create");
698 goto error;
699 }
852d0037 700 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
701 &ua_sess->metadata->stream_obj);
702 if (ret < 0) {
703 ERR("UST create metadata stream failed");
421cb601 704 goto error;
91d76f53 705 }
421cb601 706
421cb601 707error:
86acf0da 708 health_code_update(&health_thread_cmd);
5b4a0ec0 709 return ret;
91d76f53
DG
710}
711
b551a063 712/*
5b4a0ec0 713 * Create the specified channel onto the UST tracer for a UST session.
b551a063 714 */
5b4a0ec0
DG
715static int create_ust_channel(struct ust_app *app,
716 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 717{
5b4a0ec0 718 int ret;
b551a063 719
86acf0da
DG
720 health_code_update(&health_thread_cmd);
721
5b4a0ec0 722 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
723
724 /* We are going to receive 2 fds, we need to reserve them. */
725 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
726 if (ret < 0) {
727 ERR("Exhausted number of available FD upon create channel");
728 goto error;
729 }
86acf0da
DG
730
731 health_code_update(&health_thread_cmd);
732
852d0037 733 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
734 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
735 if (ret < 0) {
58f3ca76 736 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 737 "and session handle %d with ret %d",
852d0037 738 ua_chan->name, app->pid, app->sock,
5b4a0ec0 739 ua_sess->handle, ret);
4063050c 740 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
741 goto error;
742 }
743
5b4a0ec0 744 ua_chan->handle = ua_chan->obj->handle;
b551a063 745
5b4a0ec0 746 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 747 ua_chan->name, app->pid, app->sock);
b551a063 748
86acf0da
DG
749 health_code_update(&health_thread_cmd);
750
8535a6d9
DG
751 /* If channel is not enabled, disable it on the tracer */
752 if (!ua_chan->enabled) {
753 ret = disable_ust_channel(app, ua_sess, ua_chan);
754 if (ret < 0) {
755 goto error;
756 }
757 }
758
b551a063 759error:
86acf0da 760 health_code_update(&health_thread_cmd);
b551a063
DG
761 return ret;
762}
763
91d76f53 764/*
5b4a0ec0 765 * Create the specified event onto the UST tracer for a UST session.
91d76f53 766 */
edb67388
DG
767static
768int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
769 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 770{
5b4a0ec0 771 int ret = 0;
284d8f55 772
86acf0da
DG
773 health_code_update(&health_thread_cmd);
774
5b4a0ec0 775 /* Create UST event on tracer */
852d0037 776 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
777 &ua_event->obj);
778 if (ret < 0) {
779 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 780 ua_event->attr.name, app->pid, ret);
5b4a0ec0 781 goto error;
91d76f53 782 }
f6a9efaa 783
5b4a0ec0 784 ua_event->handle = ua_event->obj->handle;
284d8f55 785
5b4a0ec0 786 DBG2("UST app event %s created successfully for pid:%d",
852d0037 787 ua_event->attr.name, app->pid);
f6a9efaa 788
86acf0da
DG
789 health_code_update(&health_thread_cmd);
790
8535a6d9 791 /* If event not enabled, disable it on the tracer */
fc34caaa 792 if (ua_event->enabled == 0) {
8535a6d9
DG
793 ret = disable_ust_event(app, ua_sess, ua_event);
794 if (ret < 0) {
fc34caaa
DG
795 /*
796 * If we hit an EPERM, something is wrong with our disable call. If
797 * we get an EEXIST, there is a problem on the tracer side since we
798 * just created it.
799 */
800 switch (ret) {
49c336c1 801 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
802 /* Code flow problem */
803 assert(0);
49c336c1 804 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
805 /* It's OK for our use case. */
806 ret = 0;
807 break;
808 default:
809 break;
810 }
8535a6d9
DG
811 goto error;
812 }
813 }
814
5b4a0ec0 815error:
86acf0da 816 health_code_update(&health_thread_cmd);
5b4a0ec0 817 return ret;
91d76f53 818}
48842b30 819
5b4a0ec0
DG
820/*
821 * Copy data between an UST app event and a LTT event.
822 */
421cb601 823static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
824 struct ltt_ust_event *uevent)
825{
826 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
827 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
828
fc34caaa
DG
829 ua_event->enabled = uevent->enabled;
830
5b4a0ec0
DG
831 /* Copy event attributes */
832 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
833
53a80697
MD
834 /* Copy filter bytecode */
835 if (uevent->filter) {
836 ua_event->filter = zmalloc(sizeof(*ua_event->filter) +
837 uevent->filter->len);
838 if (!ua_event->filter) {
839 return;
840 }
841 memcpy(ua_event->filter, uevent->filter,
842 sizeof(*ua_event->filter) + uevent->filter->len);
843 }
48842b30
DG
844}
845
5b4a0ec0
DG
846/*
847 * Copy data between an UST app channel and a LTT channel.
848 */
421cb601 849static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
850 struct ltt_ust_channel *uchan)
851{
bec39940 852 struct lttng_ht_iter iter;
48842b30 853 struct ltt_ust_event *uevent;
55cc08a6 854 struct ltt_ust_context *uctx;
48842b30 855 struct ust_app_event *ua_event;
55cc08a6 856 struct ust_app_ctx *ua_ctx;
48842b30 857
fc34caaa 858 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
859
860 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
861 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
862 /* Copy event attributes */
863 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 864
fc34caaa
DG
865 ua_chan->enabled = uchan->enabled;
866
bec39940 867 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
868 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
869 if (ua_ctx == NULL) {
870 continue;
871 }
bec39940
DG
872 lttng_ht_node_init_ulong(&ua_ctx->node,
873 (unsigned long) ua_ctx->ctx.ctx);
874 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 875 }
48842b30 876
421cb601 877 /* Copy all events from ltt ust channel to ust app channel */
bec39940 878 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b
DG
879 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
880 uevent->filter, uevent->attr.loglevel);
881 if (ua_event == NULL) {
421cb601 882 DBG2("UST event %s not found on shadow copy channel",
48842b30 883 uevent->attr.name);
284d8f55 884 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 885 if (ua_event == NULL) {
5b4a0ec0 886 continue;
48842b30 887 }
421cb601 888 shadow_copy_event(ua_event, uevent);
18eace3b 889 add_unique_ust_app_event(ua_chan->events, ua_event);
48842b30 890 }
48842b30
DG
891 }
892
fc34caaa 893 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
894}
895
5b4a0ec0
DG
896/*
897 * Copy data between a UST app session and a regular LTT session.
898 */
421cb601 899static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 900 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 901{
bec39940
DG
902 struct lttng_ht_node_str *ua_chan_node;
903 struct lttng_ht_iter iter;
48842b30
DG
904 struct ltt_ust_channel *uchan;
905 struct ust_app_channel *ua_chan;
477d7741
MD
906 time_t rawtime;
907 struct tm *timeinfo;
908 char datetime[16];
909 int ret;
910
911 /* Get date and time for unique app path */
912 time(&rawtime);
913 timeinfo = localtime(&rawtime);
914 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 915
421cb601 916 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 917
a991f516 918 ua_sess->id = usess->id;
6df2e2c9
MD
919 ua_sess->uid = usess->uid;
920 ua_sess->gid = usess->gid;
48842b30 921
00e2e675
DG
922 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
923 datetime);
477d7741
MD
924 if (ret < 0) {
925 PERROR("asprintf UST shadow copy session");
926 /* TODO: We cannot return an error from here.. */
927 assert(0);
928 }
929
48842b30
DG
930 /* TODO: support all UST domain */
931
932 /* Iterate over all channels in global domain. */
bec39940
DG
933 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
934 uchan, node.node) {
935 struct lttng_ht_iter uiter;
ba767faf 936
bec39940
DG
937 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
938 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 939 if (ua_chan_node != NULL) {
fc34caaa 940 /* Session exist. Contiuing. */
5b4a0ec0
DG
941 continue;
942 }
421cb601 943
5b4a0ec0
DG
944 DBG2("Channel %s not found on shadow session copy, creating it",
945 uchan->name);
946 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
947 if (ua_chan == NULL) {
fc34caaa 948 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 949 continue;
48842b30
DG
950 }
951
5b4a0ec0 952 shadow_copy_channel(ua_chan, uchan);
bec39940 953 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
954 }
955}
956
78f0bacd
DG
957/*
958 * Lookup sesison wrapper.
959 */
84cd17c6
MD
960static
961void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 962 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
963{
964 /* Get right UST app session from app */
2c348c10 965 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
966}
967
421cb601
DG
968/*
969 * Return ust app session from the app session hashtable using the UST session
a991f516 970 * id.
421cb601 971 */
48842b30
DG
972static struct ust_app_session *lookup_session_by_app(
973 struct ltt_ust_session *usess, struct ust_app *app)
974{
bec39940
DG
975 struct lttng_ht_iter iter;
976 struct lttng_ht_node_ulong *node;
48842b30 977
84cd17c6 978 __lookup_session_by_app(usess, app, &iter);
bec39940 979 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
980 if (node == NULL) {
981 goto error;
982 }
983
984 return caa_container_of(node, struct ust_app_session, node);
985
986error:
987 return NULL;
988}
989
421cb601
DG
990/*
991 * Create a UST session onto the tracer of app and add it the session
992 * hashtable.
993 *
994 * Return ust app session or NULL on error.
995 */
996static struct ust_app_session *create_ust_app_session(
997 struct ltt_ust_session *usess, struct ust_app *app)
998{
999 int ret;
1000 struct ust_app_session *ua_sess;
1001
86acf0da
DG
1002 health_code_update(&health_thread_cmd);
1003
421cb601
DG
1004 ua_sess = lookup_session_by_app(usess, app);
1005 if (ua_sess == NULL) {
a991f516 1006 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 1007 app->pid, usess->id);
421cb601
DG
1008 ua_sess = alloc_ust_app_session();
1009 if (ua_sess == NULL) {
1010 /* Only malloc can failed so something is really wrong */
fc34caaa 1011 goto end;
421cb601 1012 }
477d7741 1013 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
1014 }
1015
86acf0da
DG
1016 health_code_update(&health_thread_cmd);
1017
421cb601 1018 if (ua_sess->handle == -1) {
852d0037 1019 ret = ustctl_create_session(app->sock);
421cb601 1020 if (ret < 0) {
852d0037 1021 ERR("Creating session for app pid %d", app->pid);
0f83395d 1022 delete_ust_app_session(-1, ua_sess);
915d047c
DG
1023 /* This means that the tracer is gone... */
1024 ua_sess = (void*) -1UL;
0f83395d 1025 goto end;
421cb601
DG
1026 }
1027
421cb601
DG
1028 ua_sess->handle = ret;
1029
1030 /* Add ust app session to app's HT */
2c348c10 1031 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 1032 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
1033
1034 DBG2("UST app session created successfully with handle %d", ret);
1035 }
1036
fc34caaa 1037end:
86acf0da 1038 health_code_update(&health_thread_cmd);
421cb601 1039 return ua_sess;
421cb601
DG
1040}
1041
55cc08a6
DG
1042/*
1043 * Create a context for the channel on the tracer.
1044 */
1045static
1046int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1047 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1048 struct ust_app *app)
1049{
1050 int ret = 0;
bec39940
DG
1051 struct lttng_ht_iter iter;
1052 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1053 struct ust_app_ctx *ua_ctx;
1054
1055 DBG2("UST app adding context to channel %s", ua_chan->name);
1056
bec39940
DG
1057 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1058 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1059 if (node != NULL) {
1060 ret = -EEXIST;
1061 goto error;
1062 }
1063
1064 ua_ctx = alloc_ust_app_ctx(uctx);
1065 if (ua_ctx == NULL) {
1066 /* malloc failed */
1067 ret = -1;
1068 goto error;
1069 }
1070
bec39940
DG
1071 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1072 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1073
1074 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078
1079error:
1080 return ret;
1081}
1082
53a80697
MD
1083/*
1084 * Set UST filter for the event on the tracer.
1085 */
1086static
1087int set_ust_app_event_filter(struct ust_app_session *ua_sess,
1088 struct ust_app_event *ua_event,
1089 struct lttng_filter_bytecode *bytecode,
1090 struct ust_app *app)
1091{
1092 int ret = 0;
1093
1094 DBG2("UST app adding context to event %s", ua_event->name);
1095
1096 /* Copy filter bytecode */
1097 ua_event->filter = zmalloc(sizeof(*ua_event->filter) + bytecode->len);
1098 if (!ua_event->filter) {
1099 return -ENOMEM;
1100 }
1101 memcpy(ua_event->filter, bytecode,
1102 sizeof(*ua_event->filter) + bytecode->len);
1103 ret = set_ust_event_filter(ua_event, app);
1104 if (ret < 0) {
1105 goto error;
1106 }
1107
1108error:
1109 return ret;
1110}
1111
edb67388
DG
1112/*
1113 * Enable on the tracer side a ust app event for the session and channel.
1114 */
1115static
1116int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1117 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1118{
1119 int ret;
1120
1121 ret = enable_ust_event(app, ua_sess, ua_event);
1122 if (ret < 0) {
1123 goto error;
1124 }
1125
1126 ua_event->enabled = 1;
1127
1128error:
1129 return ret;
1130}
1131
9730260e
DG
1132/*
1133 * Disable on the tracer side a ust app event for the session and channel.
1134 */
1135static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1136 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1137{
1138 int ret;
1139
1140 ret = disable_ust_event(app, ua_sess, ua_event);
1141 if (ret < 0) {
1142 goto error;
1143 }
1144
1145 ua_event->enabled = 0;
1146
1147error:
1148 return ret;
1149}
1150
78f0bacd
DG
1151/*
1152 * Lookup ust app channel for session and disable it on the tracer side.
1153 */
8535a6d9
DG
1154static
1155int disable_ust_app_channel(struct ust_app_session *ua_sess,
1156 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1157{
8535a6d9 1158 int ret;
78f0bacd
DG
1159
1160 ret = disable_ust_channel(app, ua_sess, ua_chan);
1161 if (ret < 0) {
1162 goto error;
1163 }
1164
8535a6d9
DG
1165 ua_chan->enabled = 0;
1166
78f0bacd
DG
1167error:
1168 return ret;
1169}
1170
1171/*
1172 * Lookup ust app channel for session and enable it on the tracer side.
1173 */
1174static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1175 struct ltt_ust_channel *uchan, struct ust_app *app)
1176{
1177 int ret = 0;
bec39940
DG
1178 struct lttng_ht_iter iter;
1179 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1180 struct ust_app_channel *ua_chan;
1181
bec39940
DG
1182 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1183 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1184 if (ua_chan_node == NULL) {
a991f516
MD
1185 DBG2("Unable to find channel %s in ust session id %u",
1186 uchan->name, ua_sess->id);
78f0bacd
DG
1187 goto error;
1188 }
1189
1190 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1191
1192 ret = enable_ust_channel(app, ua_sess, ua_chan);
1193 if (ret < 0) {
1194 goto error;
1195 }
1196
1197error:
1198 return ret;
1199}
1200
284d8f55 1201/*
5b4a0ec0 1202 * Create UST app channel and create it on the tracer.
284d8f55 1203 */
5b4a0ec0
DG
1204static struct ust_app_channel *create_ust_app_channel(
1205 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1206 struct ust_app *app)
1207{
1208 int ret = 0;
bec39940
DG
1209 struct lttng_ht_iter iter;
1210 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1211 struct ust_app_channel *ua_chan;
1212
1213 /* Lookup channel in the ust app session */
bec39940
DG
1214 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1215 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1216 if (ua_chan_node != NULL) {
5b4a0ec0 1217 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1218 goto end;
5b4a0ec0
DG
1219 }
1220
fc34caaa
DG
1221 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1222 if (ua_chan == NULL) {
1223 /* Only malloc can fail here */
1224 goto error;
1225 }
1226 shadow_copy_channel(ua_chan, uchan);
1227
5b4a0ec0
DG
1228 ret = create_ust_channel(app, ua_sess, ua_chan);
1229 if (ret < 0) {
fc34caaa 1230 /* Not found previously means that it does not exist on the tracer */
49c336c1 1231 assert(ret != -LTTNG_UST_ERR_EXIST);
5b4a0ec0
DG
1232 goto error;
1233 }
1234
58f3ca76
DG
1235 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1236
fc34caaa 1237 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1238 app->pid);
fc34caaa
DG
1239
1240end:
5b4a0ec0
DG
1241 return ua_chan;
1242
1243error:
fc34caaa 1244 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1245 return NULL;
1246}
1247
1248/*
1249 * Create UST app event and create it on the tracer side.
1250 */
edb67388
DG
1251static
1252int create_ust_app_event(struct ust_app_session *ua_sess,
1253 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1254 struct ust_app *app)
284d8f55 1255{
edb67388 1256 int ret = 0;
5b4a0ec0 1257 struct ust_app_event *ua_event;
284d8f55 1258
5b4a0ec0 1259 /* Get event node */
18eace3b
DG
1260 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1261 uevent->filter, uevent->attr.loglevel);
1262 if (ua_event != NULL) {
fc34caaa 1263 ret = -EEXIST;
edb67388
DG
1264 goto end;
1265 }
5b4a0ec0 1266
edb67388
DG
1267 /* Does not exist so create one */
1268 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1269 if (ua_event == NULL) {
1270 /* Only malloc can failed so something is really wrong */
1271 ret = -ENOMEM;
fc34caaa 1272 goto end;
5b4a0ec0 1273 }
edb67388 1274 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1275
edb67388 1276 /* Create it on the tracer side */
5b4a0ec0 1277 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1278 if (ret < 0) {
fc34caaa 1279 /* Not found previously means that it does not exist on the tracer */
76f66f63 1280 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
1281 goto error;
1282 }
1283
18eace3b 1284 add_unique_ust_app_event(ua_chan->events, ua_event);
284d8f55 1285
fc34caaa 1286 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1287 app->pid);
7f79d3a1 1288
edb67388 1289end:
fc34caaa
DG
1290 return ret;
1291
5b4a0ec0 1292error:
fc34caaa
DG
1293 /* Valid. Calling here is already in a read side lock */
1294 delete_ust_app_event(-1, ua_event);
edb67388 1295 return ret;
5b4a0ec0
DG
1296}
1297
1298/*
1299 * Create UST metadata and open it on the tracer side.
1300 */
1301static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1302 char *pathname, struct ust_app *app)
1303{
1304 int ret = 0;
1305
1306 if (ua_sess->metadata == NULL) {
1307 /* Allocate UST metadata */
1308 ua_sess->metadata = trace_ust_create_metadata(pathname);
1309 if (ua_sess->metadata == NULL) {
fc34caaa 1310 /* malloc() failed */
5b4a0ec0
DG
1311 goto error;
1312 }
1313
1314 ret = open_ust_metadata(app, ua_sess);
1315 if (ret < 0) {
7db205b5
DG
1316 DBG3("Opening metadata failed. Cleaning up memory");
1317
fc34caaa
DG
1318 /* Cleanup failed metadata struct */
1319 free(ua_sess->metadata);
7db205b5
DG
1320 /*
1321 * This is very important because delete_ust_app_session check if
1322 * the pointer is null or not in order to delete the metadata.
1323 */
1324 ua_sess->metadata = NULL;
5b4a0ec0
DG
1325 goto error;
1326 }
1327
852d0037 1328 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1329 }
1330
1331 /* Open UST metadata stream */
1332 if (ua_sess->metadata->stream_obj == NULL) {
1333 ret = create_ust_stream(app, ua_sess);
1334 if (ret < 0) {
1335 goto error;
1336 }
1337
477d7741
MD
1338 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1339 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1340 if (ret < 0) {
1341 PERROR("asprintf UST create stream");
1342 goto error;
1343 }
1344
1345 DBG2("UST metadata stream object created for app pid %d",
852d0037 1346 app->pid);
5b4a0ec0
DG
1347 } else {
1348 ERR("Attempting to create stream without metadata opened");
1349 goto error;
1350 }
1351
1352 return 0;
1353
1354error:
1355 return -1;
1356}
1357
1358/*
1359 * Return pointer to traceable apps list.
1360 */
bec39940 1361struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1362{
1363 return ust_app_ht;
1364}
1365
1366/*
1367 * Return ust app pointer or NULL if not found.
1368 */
1369struct ust_app *ust_app_find_by_pid(pid_t pid)
1370{
bec39940
DG
1371 struct lttng_ht_node_ulong *node;
1372 struct lttng_ht_iter iter;
5b4a0ec0
DG
1373
1374 rcu_read_lock();
bec39940
DG
1375 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1376 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1377 if (node == NULL) {
1378 DBG2("UST app no found with pid %d", pid);
1379 goto error;
1380 }
1381 rcu_read_unlock();
1382
1383 DBG2("Found UST app by pid %d", pid);
1384
852d0037 1385 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1386
1387error:
1388 rcu_read_unlock();
1389 return NULL;
1390}
1391
1392/*
1393 * Using pid and uid (of the app), allocate a new ust_app struct and
1394 * add it to the global traceable app list.
1395 *
0df502fd
MD
1396 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1397 * bitness is not supported.
5b4a0ec0
DG
1398 */
1399int ust_app_register(struct ust_register_msg *msg, int sock)
1400{
1401 struct ust_app *lta;
799e2c4f 1402 int ret;
5b4a0ec0 1403
173af62f
DG
1404 if ((msg->bits_per_long == 64 &&
1405 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1406 || (msg->bits_per_long == 32 &&
1407 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1408 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1409 "%d-bit long, but no consumerd for this long size is available.\n",
1410 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1411 ret = close(sock);
1412 if (ret) {
1413 PERROR("close");
1414 }
4063050c 1415 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1416 return -EINVAL;
1417 }
3f2c5fcc
MD
1418 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1419 ERR("Registration failed: application \"%s\" (pid: %d) has "
1420 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1421 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1422 ret = close(sock);
1423 if (ret) {
1424 PERROR("close");
1425 }
4063050c 1426 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1427 return -EINVAL;
1428 }
5b4a0ec0
DG
1429 lta = zmalloc(sizeof(struct ust_app));
1430 if (lta == NULL) {
1431 PERROR("malloc");
1432 return -ENOMEM;
1433 }
1434
1435 lta->ppid = msg->ppid;
1436 lta->uid = msg->uid;
1437 lta->gid = msg->gid;
e0c7ec2b 1438 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1439 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1440 lta->v_major = msg->major;
1441 lta->v_minor = msg->minor;
1442 strncpy(lta->name, msg->name, sizeof(lta->name));
1443 lta->name[16] = '\0';
bec39940 1444 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1445
852d0037
DG
1446 lta->pid = msg->pid;
1447 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1448 lta->sock = sock;
1449 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0
DG
1450
1451 rcu_read_lock();
852d0037
DG
1452
1453 /*
1454 * On a re-registration, we want to kick out the previous registration of
1455 * that pid
1456 */
1457 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1458
1459 /*
1460 * The socket _should_ be unique until _we_ call close. So, a add_unique
1461 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1462 * already in the table.
1463 */
1464 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1465
5b4a0ec0
DG
1466 rcu_read_unlock();
1467
1468 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1469 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1470 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1471
1472 return 0;
1473}
1474
1475/*
1476 * Unregister app by removing it from the global traceable app list and freeing
1477 * the data struct.
1478 *
1479 * The socket is already closed at this point so no close to sock.
1480 */
1481void ust_app_unregister(int sock)
1482{
1483 struct ust_app *lta;
bec39940
DG
1484 struct lttng_ht_node_ulong *node;
1485 struct lttng_ht_iter iter;
525b0740 1486 int ret;
5b4a0ec0
DG
1487
1488 rcu_read_lock();
886459c6 1489
5b4a0ec0 1490 /* Get the node reference for a call_rcu */
852d0037 1491 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1492 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1493 if (node == NULL) {
852d0037 1494 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1495 goto error;
1496 }
284d8f55 1497
852d0037
DG
1498 lta = caa_container_of(node, struct ust_app, sock_n);
1499
1500 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1501
886459c6 1502 /* Remove application from PID hash table */
852d0037
DG
1503 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1504 assert(!ret);
1505
1506 /* Assign second node for deletion */
1507 iter.iter.node = &lta->pid_n.node;
1508
5b98a774
DG
1509 /*
1510 * Ignore return value since the node might have been removed before by an
1511 * add replace during app registration because the PID can be reassigned by
1512 * the OS.
1513 */
bec39940 1514 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
1515 if (ret) {
1516 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1517 lta->pid);
1518 }
852d0037
DG
1519
1520 /* Free memory */
1521 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1522
284d8f55 1523error:
5b4a0ec0
DG
1524 rcu_read_unlock();
1525 return;
284d8f55
DG
1526}
1527
1528/*
5b4a0ec0 1529 * Return traceable_app_count
284d8f55 1530 */
5b4a0ec0 1531unsigned long ust_app_list_count(void)
284d8f55 1532{
5b4a0ec0 1533 unsigned long count;
284d8f55 1534
5b4a0ec0 1535 rcu_read_lock();
bec39940 1536 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1537 rcu_read_unlock();
284d8f55 1538
5b4a0ec0 1539 return count;
284d8f55
DG
1540}
1541
5b4a0ec0
DG
1542/*
1543 * Fill events array with all events name of all registered apps.
1544 */
1545int ust_app_list_events(struct lttng_event **events)
421cb601 1546{
5b4a0ec0
DG
1547 int ret, handle;
1548 size_t nbmem, count = 0;
bec39940 1549 struct lttng_ht_iter iter;
5b4a0ec0
DG
1550 struct ust_app *app;
1551 struct lttng_event *tmp;
421cb601 1552
5b4a0ec0
DG
1553 nbmem = UST_APP_EVENT_LIST_SIZE;
1554 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1555 if (tmp == NULL) {
1556 PERROR("zmalloc ust app events");
1557 ret = -ENOMEM;
421cb601
DG
1558 goto error;
1559 }
1560
5b4a0ec0 1561 rcu_read_lock();
421cb601 1562
852d0037 1563 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1564 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1565
86acf0da
DG
1566 health_code_update(&health_thread_cmd);
1567
e0c7ec2b
DG
1568 if (!app->compatible) {
1569 /*
1570 * TODO: In time, we should notice the caller of this error by
1571 * telling him that this is a version error.
1572 */
1573 continue;
1574 }
852d0037 1575 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1576 if (handle < 0) {
1577 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1578 app->pid);
5b4a0ec0
DG
1579 continue;
1580 }
421cb601 1581
852d0037 1582 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 1583 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1584 health_code_update(&health_thread_cmd);
815564d8 1585 if (count >= nbmem) {
d7b3776f
DG
1586 /* In case the realloc fails, we free the memory */
1587 void *tmp_ptr = (void *) tmp;
815564d8
MD
1588 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1589 2 * nbmem);
1590 nbmem *= 2;
2f221590 1591 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1592 if (tmp == NULL) {
1593 PERROR("realloc ust app events");
d7b3776f 1594 free(tmp_ptr);
5b4a0ec0
DG
1595 ret = -ENOMEM;
1596 goto rcu_error;
1597 }
1598 }
90eaa0d2 1599 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1600 tmp[count].loglevel = uiter.loglevel;
6775595e 1601 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1602 tmp[count].pid = app->pid;
5b4a0ec0
DG
1603 tmp[count].enabled = -1;
1604 count++;
421cb601 1605 }
421cb601
DG
1606 }
1607
5b4a0ec0
DG
1608 ret = count;
1609 *events = tmp;
421cb601 1610
5b4a0ec0 1611 DBG2("UST app list events done (%zu events)", count);
421cb601 1612
5b4a0ec0
DG
1613rcu_error:
1614 rcu_read_unlock();
421cb601 1615error:
86acf0da 1616 health_code_update(&health_thread_cmd);
5b4a0ec0 1617 return ret;
421cb601
DG
1618}
1619
f37d259d
MD
1620/*
1621 * Fill events array with all events name of all registered apps.
1622 */
1623int ust_app_list_event_fields(struct lttng_event_field **fields)
1624{
1625 int ret, handle;
1626 size_t nbmem, count = 0;
1627 struct lttng_ht_iter iter;
1628 struct ust_app *app;
1629 struct lttng_event_field *tmp;
1630
1631 nbmem = UST_APP_EVENT_LIST_SIZE;
1632 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1633 if (tmp == NULL) {
1634 PERROR("zmalloc ust app event fields");
1635 ret = -ENOMEM;
1636 goto error;
1637 }
1638
1639 rcu_read_lock();
1640
1641 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1642 struct lttng_ust_field_iter uiter;
1643
86acf0da
DG
1644 health_code_update(&health_thread_cmd);
1645
f37d259d
MD
1646 if (!app->compatible) {
1647 /*
1648 * TODO: In time, we should notice the caller of this error by
1649 * telling him that this is a version error.
1650 */
1651 continue;
1652 }
1653 handle = ustctl_tracepoint_field_list(app->sock);
1654 if (handle < 0) {
1655 ERR("UST app list event fields getting handle failed for app pid %d",
1656 app->pid);
1657 continue;
1658 }
1659
1660 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 1661 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1662 health_code_update(&health_thread_cmd);
f37d259d 1663 if (count >= nbmem) {
d7b3776f
DG
1664 /* In case the realloc fails, we free the memory */
1665 void *tmp_ptr = (void *) tmp;
f37d259d
MD
1666 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1667 2 * nbmem);
1668 nbmem *= 2;
1669 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1670 if (tmp == NULL) {
1671 PERROR("realloc ust app event fields");
d7b3776f 1672 free(tmp_ptr);
f37d259d
MD
1673 ret = -ENOMEM;
1674 goto rcu_error;
1675 }
1676 }
f37d259d
MD
1677
1678 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1679 tmp[count].type = uiter.type;
590b9e3c 1680 tmp[count].nowrite = uiter.nowrite;
f37d259d
MD
1681
1682 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1683 tmp[count].event.loglevel = uiter.loglevel;
1684 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1685 tmp[count].event.pid = app->pid;
1686 tmp[count].event.enabled = -1;
1687 count++;
1688 }
1689 }
1690
1691 ret = count;
1692 *fields = tmp;
1693
1694 DBG2("UST app list event fields done (%zu events)", count);
1695
1696rcu_error:
1697 rcu_read_unlock();
1698error:
86acf0da 1699 health_code_update(&health_thread_cmd);
f37d259d
MD
1700 return ret;
1701}
1702
5b4a0ec0
DG
1703/*
1704 * Free and clean all traceable apps of the global list.
1705 */
1706void ust_app_clean_list(void)
421cb601 1707{
5b4a0ec0 1708 int ret;
659ed79f 1709 struct ust_app *app;
bec39940 1710 struct lttng_ht_iter iter;
421cb601 1711
5b4a0ec0 1712 DBG2("UST app cleaning registered apps hash table");
421cb601 1713
5b4a0ec0 1714 rcu_read_lock();
421cb601 1715
659ed79f 1716 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1717 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1718 assert(!ret);
659ed79f 1719 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1720 }
1721
852d0037 1722 /* Cleanup socket hash table */
659ed79f
DG
1723 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1724 sock_n.node) {
852d0037 1725 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1726 assert(!ret);
1727 }
852d0037 1728
bec39940 1729 /* Destroy is done only when the ht is empty */
852d0037
DG
1730 lttng_ht_destroy(ust_app_ht);
1731 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1732
5b4a0ec0
DG
1733 rcu_read_unlock();
1734}
1735
1736/*
1737 * Init UST app hash table.
1738 */
1739void ust_app_ht_alloc(void)
1740{
bec39940 1741 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1742 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1743}
1744
78f0bacd
DG
1745/*
1746 * For a specific UST session, disable the channel for all registered apps.
1747 */
35a9059d 1748int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1749 struct ltt_ust_channel *uchan)
1750{
1751 int ret = 0;
bec39940
DG
1752 struct lttng_ht_iter iter;
1753 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1754 struct ust_app *app;
1755 struct ust_app_session *ua_sess;
8535a6d9 1756 struct ust_app_channel *ua_chan;
78f0bacd
DG
1757
1758 if (usess == NULL || uchan == NULL) {
1759 ERR("Disabling UST global channel with NULL values");
1760 ret = -1;
1761 goto error;
1762 }
1763
a991f516
MD
1764 DBG2("UST app disabling channel %s from global domain for session id %d",
1765 uchan->name, usess->id);
78f0bacd
DG
1766
1767 rcu_read_lock();
1768
1769 /* For every registered applications */
852d0037 1770 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1771 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1772 if (!app->compatible) {
1773 /*
1774 * TODO: In time, we should notice the caller of this error by
1775 * telling him that this is a version error.
1776 */
1777 continue;
1778 }
78f0bacd
DG
1779 ua_sess = lookup_session_by_app(usess, app);
1780 if (ua_sess == NULL) {
1781 continue;
1782 }
1783
8535a6d9 1784 /* Get channel */
bec39940
DG
1785 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1786 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1787 /* If the session if found for the app, the channel must be there */
1788 assert(ua_chan_node);
1789
1790 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1791 /* The channel must not be already disabled */
1792 assert(ua_chan->enabled == 1);
1793
1794 /* Disable channel onto application */
1795 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1796 if (ret < 0) {
1797 /* XXX: We might want to report this error at some point... */
1798 continue;
1799 }
1800 }
1801
1802 rcu_read_unlock();
1803
1804error:
1805 return ret;
1806}
1807
1808/*
1809 * For a specific UST session, enable the channel for all registered apps.
1810 */
35a9059d 1811int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1812 struct ltt_ust_channel *uchan)
1813{
1814 int ret = 0;
bec39940 1815 struct lttng_ht_iter iter;
78f0bacd
DG
1816 struct ust_app *app;
1817 struct ust_app_session *ua_sess;
1818
1819 if (usess == NULL || uchan == NULL) {
1820 ERR("Adding UST global channel to NULL values");
1821 ret = -1;
1822 goto error;
1823 }
1824
a991f516
MD
1825 DBG2("UST app enabling channel %s to global domain for session id %d",
1826 uchan->name, usess->id);
78f0bacd
DG
1827
1828 rcu_read_lock();
1829
1830 /* For every registered applications */
852d0037 1831 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1832 if (!app->compatible) {
1833 /*
1834 * TODO: In time, we should notice the caller of this error by
1835 * telling him that this is a version error.
1836 */
1837 continue;
1838 }
78f0bacd
DG
1839 ua_sess = lookup_session_by_app(usess, app);
1840 if (ua_sess == NULL) {
1841 continue;
1842 }
1843
1844 /* Enable channel onto application */
1845 ret = enable_ust_app_channel(ua_sess, uchan, app);
1846 if (ret < 0) {
1847 /* XXX: We might want to report this error at some point... */
1848 continue;
1849 }
1850 }
1851
1852 rcu_read_unlock();
1853
1854error:
1855 return ret;
1856}
1857
b0a40d28
DG
1858/*
1859 * Disable an event in a channel and for a specific session.
1860 */
35a9059d
DG
1861int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1862 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1863{
1864 int ret = 0;
bec39940
DG
1865 struct lttng_ht_iter iter, uiter;
1866 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1867 struct ust_app *app;
1868 struct ust_app_session *ua_sess;
1869 struct ust_app_channel *ua_chan;
1870 struct ust_app_event *ua_event;
1871
1872 DBG("UST app disabling event %s for all apps in channel "
a991f516 1873 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1874
1875 rcu_read_lock();
1876
1877 /* For all registered applications */
852d0037 1878 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1879 if (!app->compatible) {
1880 /*
1881 * TODO: In time, we should notice the caller of this error by
1882 * telling him that this is a version error.
1883 */
1884 continue;
1885 }
b0a40d28
DG
1886 ua_sess = lookup_session_by_app(usess, app);
1887 if (ua_sess == NULL) {
1888 /* Next app */
1889 continue;
1890 }
1891
1892 /* Lookup channel in the ust app session */
bec39940
DG
1893 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1894 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1895 if (ua_chan_node == NULL) {
a991f516 1896 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1897 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1898 continue;
1899 }
1900 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1901
bec39940
DG
1902 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1903 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1904 if (ua_event_node == NULL) {
1905 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1906 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1907 continue;
1908 }
1909 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1910
7f79d3a1 1911 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1912 if (ret < 0) {
1913 /* XXX: Report error someday... */
1914 continue;
1915 }
1916 }
1917
1918 rcu_read_unlock();
1919
1920 return ret;
1921}
1922
9730260e 1923/*
edb67388 1924 * For a specific UST session and UST channel, the event for all
9730260e
DG
1925 * registered apps.
1926 */
35a9059d 1927int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1928 struct ltt_ust_channel *uchan)
1929{
1930 int ret = 0;
bec39940
DG
1931 struct lttng_ht_iter iter, uiter;
1932 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1933 struct ust_app *app;
1934 struct ust_app_session *ua_sess;
1935 struct ust_app_channel *ua_chan;
1936 struct ust_app_event *ua_event;
1937
1938 DBG("UST app disabling all event for all apps in channel "
a991f516 1939 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1940
1941 rcu_read_lock();
1942
1943 /* For all registered applications */
852d0037 1944 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1945 if (!app->compatible) {
1946 /*
1947 * TODO: In time, we should notice the caller of this error by
1948 * telling him that this is a version error.
1949 */
1950 continue;
1951 }
9730260e 1952 ua_sess = lookup_session_by_app(usess, app);
edb67388
DG
1953 /* If ua_sess is NULL, there is a code flow error */
1954 assert(ua_sess);
9730260e
DG
1955
1956 /* Lookup channel in the ust app session */
bec39940
DG
1957 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1958 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1959 /* If the channel is not found, there is a code flow error */
1960 assert(ua_chan_node);
1961
9730260e
DG
1962 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1963
1964 /* Disable each events of channel */
bec39940
DG
1965 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
1966 node.node) {
7f79d3a1 1967 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
1968 if (ret < 0) {
1969 /* XXX: Report error someday... */
1970 continue;
1971 }
1972 }
1973 }
1974
1975 rcu_read_unlock();
1976
1977 return ret;
1978}
1979
421cb601 1980/*
5b4a0ec0 1981 * For a specific UST session, create the channel for all registered apps.
421cb601 1982 */
35a9059d 1983int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
1984 struct ltt_ust_channel *uchan)
1985{
3c14c33f 1986 int ret = 0;
bec39940 1987 struct lttng_ht_iter iter;
48842b30
DG
1988 struct ust_app *app;
1989 struct ust_app_session *ua_sess;
1990 struct ust_app_channel *ua_chan;
1991
fc34caaa
DG
1992 /* Very wrong code flow */
1993 assert(usess);
1994 assert(uchan);
421cb601 1995
a991f516
MD
1996 DBG2("UST app adding channel %s to global domain for session id %d",
1997 uchan->name, usess->id);
48842b30
DG
1998
1999 rcu_read_lock();
421cb601 2000
5b4a0ec0 2001 /* For every registered applications */
852d0037 2002 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2003 if (!app->compatible) {
2004 /*
2005 * TODO: In time, we should notice the caller of this error by
2006 * telling him that this is a version error.
2007 */
2008 continue;
2009 }
edb67388
DG
2010 /*
2011 * Create session on the tracer side and add it to app session HT. Note
2012 * that if session exist, it will simply return a pointer to the ust
2013 * app session.
2014 */
421cb601 2015 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2016 if (ua_sess == NULL) {
915d047c 2017 /* The malloc() failed. */
3c14c33f 2018 ret = -1;
fc34caaa 2019 goto error;
915d047c
DG
2020 } else if (ua_sess == (void *) -1UL) {
2021 /* The application's socket is not valid. Contiuing */
3c14c33f 2022 ret = -1;
915d047c 2023 continue;
48842b30
DG
2024 }
2025
421cb601
DG
2026 /* Create channel onto application */
2027 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2028 if (ua_chan == NULL) {
fc34caaa 2029 /* Major problem here and it's maybe the tracer or malloc() */
3c14c33f 2030 ret = -1;
fc34caaa 2031 goto error;
48842b30 2032 }
48842b30 2033 }
5b4a0ec0 2034
48842b30
DG
2035 rcu_read_unlock();
2036
421cb601 2037error:
3c14c33f 2038 return ret;
48842b30
DG
2039}
2040
5b4a0ec0 2041/*
edb67388 2042 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2043 */
35a9059d 2044int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2045 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2046{
2047 int ret = 0;
bec39940 2048 struct lttng_ht_iter iter, uiter;
18eace3b 2049 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
2050 struct ust_app *app;
2051 struct ust_app_session *ua_sess;
2052 struct ust_app_channel *ua_chan;
2053 struct ust_app_event *ua_event;
48842b30 2054
a991f516
MD
2055 DBG("UST app enabling event %s for all apps for session id %d",
2056 uevent->attr.name, usess->id);
48842b30 2057
edb67388
DG
2058 /*
2059 * NOTE: At this point, this function is called only if the session and
2060 * channel passed are already created for all apps. and enabled on the
2061 * tracer also.
2062 */
2063
48842b30 2064 rcu_read_lock();
421cb601
DG
2065
2066 /* For all registered applications */
852d0037 2067 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2068 if (!app->compatible) {
2069 /*
2070 * TODO: In time, we should notice the caller of this error by
2071 * telling him that this is a version error.
2072 */
2073 continue;
2074 }
edb67388
DG
2075 ua_sess = lookup_session_by_app(usess, app);
2076 /* If ua_sess is NULL, there is a code flow error */
2077 assert(ua_sess);
ba767faf 2078
edb67388 2079 /* Lookup channel in the ust app session */
bec39940
DG
2080 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2081 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2082 /* If the channel is not found, there is a code flow error */
2083 assert(ua_chan_node);
2084
2085 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2086
18eace3b
DG
2087 /* Get event node */
2088 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2089 uevent->filter, uevent->attr.loglevel);
2090 if (ua_event == NULL) {
7f79d3a1 2091 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2092 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2093 continue;
2094 }
35a9059d
DG
2095
2096 ret = enable_ust_app_event(ua_sess, ua_event, app);
2097 if (ret < 0) {
7f79d3a1 2098 goto error;
48842b30 2099 }
edb67388
DG
2100 }
2101
7f79d3a1 2102error:
edb67388 2103 rcu_read_unlock();
edb67388
DG
2104 return ret;
2105}
2106
2107/*
2108 * For a specific existing UST session and UST channel, creates the event for
2109 * all registered apps.
2110 */
35a9059d 2111int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2112 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2113{
2114 int ret = 0;
bec39940
DG
2115 struct lttng_ht_iter iter, uiter;
2116 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2117 struct ust_app *app;
2118 struct ust_app_session *ua_sess;
2119 struct ust_app_channel *ua_chan;
2120
a991f516
MD
2121 DBG("UST app creating event %s for all apps for session id %d",
2122 uevent->attr.name, usess->id);
edb67388 2123
edb67388
DG
2124 rcu_read_lock();
2125
2126 /* For all registered applications */
852d0037 2127 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2128 if (!app->compatible) {
2129 /*
2130 * TODO: In time, we should notice the caller of this error by
2131 * telling him that this is a version error.
2132 */
2133 continue;
2134 }
edb67388
DG
2135 ua_sess = lookup_session_by_app(usess, app);
2136 /* If ua_sess is NULL, there is a code flow error */
2137 assert(ua_sess);
48842b30
DG
2138
2139 /* Lookup channel in the ust app session */
bec39940
DG
2140 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2141 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2142 /* If the channel is not found, there is a code flow error */
2143 assert(ua_chan_node);
2144
48842b30
DG
2145 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2146
edb67388
DG
2147 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2148 if (ret < 0) {
49c336c1 2149 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
2150 /* Possible value at this point: -ENOMEM. If so, we stop! */
2151 break;
2152 }
2153 DBG2("UST app event %s already exist on app PID %d",
852d0037 2154 uevent->attr.name, app->pid);
5b4a0ec0 2155 continue;
48842b30 2156 }
48842b30 2157 }
5b4a0ec0 2158
48842b30
DG
2159 rcu_read_unlock();
2160
2161 return ret;
2162}
2163
5b4a0ec0
DG
2164/*
2165 * Start tracing for a specific UST session and app.
2166 */
421cb601 2167int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2168{
2169 int ret = 0;
bec39940 2170 struct lttng_ht_iter iter;
48842b30
DG
2171 struct ust_app_session *ua_sess;
2172 struct ust_app_channel *ua_chan;
5b4a0ec0 2173 struct ltt_ust_stream *ustream;
173af62f 2174 struct consumer_socket *socket;
48842b30 2175
852d0037 2176 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2177
509cbaf8
MD
2178 rcu_read_lock();
2179
e0c7ec2b
DG
2180 if (!app->compatible) {
2181 goto end;
2182 }
2183
421cb601
DG
2184 ua_sess = lookup_session_by_app(usess, app);
2185 if (ua_sess == NULL) {
509cbaf8 2186 goto error_rcu_unlock;
421cb601 2187 }
48842b30 2188
aea829b3
DG
2189 /* Upon restart, we skip the setup, already done */
2190 if (ua_sess->started) {
8be98f9a 2191 goto skip_setup;
aea829b3 2192 }
8be98f9a 2193
a4b92340
DG
2194 /* Create directories if consumer is LOCAL and has a path defined. */
2195 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2196 strlen(usess->consumer->dst.trace_path) > 0) {
2197 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2198 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2199 if (ret < 0) {
2200 if (ret != -EEXIST) {
2201 ERR("Trace directory creation error");
2202 ret = -1;
2203 goto error_rcu_unlock;
2204 }
2205 }
2206 }
2207
f848c3eb
DG
2208 /* Indicate that the session has been started once */
2209 ua_sess->started = 1;
2210
421cb601
DG
2211 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2212 if (ret < 0) {
f73fabfd 2213 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2214 goto error_rcu_unlock;
421cb601 2215 }
48842b30 2216
421cb601 2217 /* For each channel */
bec39940
DG
2218 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2219 node.node) {
421cb601
DG
2220 /* Create all streams */
2221 while (1) {
5b4a0ec0 2222 /* Create UST stream */
421cb601
DG
2223 ustream = zmalloc(sizeof(*ustream));
2224 if (ustream == NULL) {
2225 PERROR("zmalloc ust stream");
509cbaf8 2226 goto error_rcu_unlock;
421cb601 2227 }
48842b30 2228
4063050c
MD
2229 /* We are going to receive 2 fds, we need to reserve them. */
2230 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2231 if (ret < 0) {
2232 ERR("Exhausted number of available FD upon stream create");
2233 free(ustream);
2234 goto error_rcu_unlock;
2235 }
86acf0da
DG
2236
2237 health_code_update(&health_thread_cmd);
2238
852d0037 2239 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2240 &ustream->obj);
48842b30 2241 if (ret < 0) {
421cb601 2242 /* Got all streams */
4063050c 2243 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2244 free(ustream);
f73fabfd 2245 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2246 break;
48842b30 2247 }
421cb601 2248 ustream->handle = ustream->obj->handle;
48842b30 2249
86acf0da
DG
2250 health_code_update(&health_thread_cmd);
2251
421cb601
DG
2252 /* Order is important */
2253 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2254 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2255 ua_chan->name, ua_chan->streams.count);
2256 ua_chan->streams.count++;
aba8e916
DG
2257 if (ret < 0) {
2258 PERROR("asprintf UST create stream");
a2c0da86
MD
2259 /*
2260 * XXX what should we do here with the
2261 * stream ?
2262 */
421cb601 2263 continue;
aba8e916 2264 }
00e2e675
DG
2265 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2266 ustream->handle);
421cb601 2267 }
86acf0da
DG
2268
2269 health_code_update(&health_thread_cmd);
421cb601 2270 }
aba8e916 2271
7753dea8
MD
2272 switch (app->bits_per_long) {
2273 case 64:
173af62f
DG
2274 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2275 usess->consumer);
2276 if (socket == NULL) {
2277 goto skip_setup;
2278 }
7753dea8
MD
2279 break;
2280 case 32:
173af62f
DG
2281 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2282 usess->consumer);
2283 if (socket == NULL) {
2284 goto skip_setup;
2285 }
7753dea8
MD
2286 break;
2287 default:
2288 ret = -EINVAL;
2289 goto error_rcu_unlock;
2290 }
aea829b3 2291
421cb601 2292 /* Setup UST consumer socket and send fds to it */
173af62f 2293 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2294 if (ret < 0) {
509cbaf8 2295 goto error_rcu_unlock;
421cb601 2296 }
48842b30 2297
86acf0da
DG
2298 health_code_update(&health_thread_cmd);
2299
8be98f9a 2300skip_setup:
421cb601 2301 /* This start the UST tracing */
852d0037 2302 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2303 if (ret < 0) {
852d0037 2304 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2305 goto error_rcu_unlock;
421cb601 2306 }
5b4a0ec0 2307
86acf0da
DG
2308 health_code_update(&health_thread_cmd);
2309
421cb601 2310 /* Quiescent wait after starting trace */
852d0037 2311 ustctl_wait_quiescent(app->sock);
48842b30 2312
e0c7ec2b
DG
2313end:
2314 rcu_read_unlock();
86acf0da 2315 health_code_update(&health_thread_cmd);
421cb601 2316 return 0;
48842b30 2317
509cbaf8
MD
2318error_rcu_unlock:
2319 rcu_read_unlock();
86acf0da 2320 health_code_update(&health_thread_cmd);
421cb601
DG
2321 return -1;
2322}
48842b30 2323
8be98f9a
MD
2324/*
2325 * Stop tracing for a specific UST session and app.
2326 */
2327int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2328{
2329 int ret = 0;
bec39940 2330 struct lttng_ht_iter iter;
8be98f9a 2331 struct ust_app_session *ua_sess;
6d3686da 2332 struct ust_app_channel *ua_chan;
8be98f9a 2333
852d0037 2334 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2335
2336 rcu_read_lock();
2337
e0c7ec2b
DG
2338 if (!app->compatible) {
2339 goto end;
2340 }
2341
8be98f9a
MD
2342 ua_sess = lookup_session_by_app(usess, app);
2343 if (ua_sess == NULL) {
2344 /* Only malloc can failed so something is really wrong */
2345 goto error_rcu_unlock;
2346 }
2347
9bc07046
DG
2348 /*
2349 * If started = 0, it means that stop trace has been called for a session
2350 * that was never started. This is a code flow error and should never
2351 * happen.
2352 */
2353 assert(ua_sess->started == 1);
7db205b5 2354
86acf0da
DG
2355 health_code_update(&health_thread_cmd);
2356
9d6c7d3f 2357 /* This inhibits UST tracing */
852d0037 2358 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2359 if (ret < 0) {
852d0037 2360 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2361 goto error_rcu_unlock;
2362 }
2363
86acf0da
DG
2364 health_code_update(&health_thread_cmd);
2365
9d6c7d3f 2366 /* Quiescent wait after stopping trace */
852d0037 2367 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2368
86acf0da
DG
2369 health_code_update(&health_thread_cmd);
2370
9d6c7d3f 2371 /* Flushing buffers */
bec39940
DG
2372 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2373 node.node) {
86acf0da 2374 health_code_update(&health_thread_cmd);
852d0037 2375 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2376 if (ret < 0) {
7db205b5 2377 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2378 app->pid, ua_chan->name, ret);
6d3686da
DG
2379 /* Continuing flushing all buffers */
2380 continue;
8be98f9a
MD
2381 }
2382 }
8be98f9a 2383
86acf0da
DG
2384 health_code_update(&health_thread_cmd);
2385
90d97d10 2386 /* Flush all buffers before stopping */
852d0037 2387 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2388 if (ret < 0) {
852d0037 2389 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2390 ret);
90d97d10
DG
2391 }
2392
7db205b5
DG
2393end:
2394 rcu_read_unlock();
86acf0da 2395 health_code_update(&health_thread_cmd);
8be98f9a
MD
2396 return 0;
2397
2398error_rcu_unlock:
2399 rcu_read_unlock();
86acf0da 2400 health_code_update(&health_thread_cmd);
8be98f9a
MD
2401 return -1;
2402}
2403
84cd17c6
MD
2404/*
2405 * Destroy a specific UST session in apps.
2406 */
2407int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2408{
2409 struct ust_app_session *ua_sess;
2410 struct lttng_ust_object_data obj;
bec39940
DG
2411 struct lttng_ht_iter iter;
2412 struct lttng_ht_node_ulong *node;
525b0740 2413 int ret;
84cd17c6 2414
852d0037 2415 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2416
2417 rcu_read_lock();
2418
e0c7ec2b
DG
2419 if (!app->compatible) {
2420 goto end;
2421 }
2422
84cd17c6 2423 __lookup_session_by_app(usess, app, &iter);
bec39940 2424 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6
MD
2425 if (node == NULL) {
2426 /* Only malloc can failed so something is really wrong */
2427 goto error_rcu_unlock;
2428 }
2429 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2430 ret = lttng_ht_del(app->sessions, &iter);
525b0740 2431 assert(!ret);
84cd17c6
MD
2432 obj.handle = ua_sess->handle;
2433 obj.shm_fd = -1;
2434 obj.wait_fd = -1;
2435 obj.memory_map_size = 0;
86acf0da 2436 health_code_update(&health_thread_cmd);
852d0037 2437 ustctl_release_object(app->sock, &obj);
84cd17c6 2438
86acf0da 2439 health_code_update(&health_thread_cmd);
852d0037 2440 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2441
84cd17c6 2442 /* Quiescent wait after stopping trace */
852d0037 2443 ustctl_wait_quiescent(app->sock);
84cd17c6 2444
e0c7ec2b
DG
2445end:
2446 rcu_read_unlock();
86acf0da 2447 health_code_update(&health_thread_cmd);
84cd17c6
MD
2448 return 0;
2449
2450error_rcu_unlock:
2451 rcu_read_unlock();
86acf0da 2452 health_code_update(&health_thread_cmd);
84cd17c6
MD
2453 return -1;
2454}
2455
5b4a0ec0
DG
2456/*
2457 * Start tracing for the UST session.
2458 */
421cb601
DG
2459int ust_app_start_trace_all(struct ltt_ust_session *usess)
2460{
2461 int ret = 0;
bec39940 2462 struct lttng_ht_iter iter;
421cb601 2463 struct ust_app *app;
48842b30 2464
421cb601
DG
2465 DBG("Starting all UST traces");
2466
2467 rcu_read_lock();
421cb601 2468
852d0037 2469 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2470 ret = ust_app_start_trace(usess, app);
48842b30 2471 if (ret < 0) {
5b4a0ec0
DG
2472 /* Continue to next apps even on error */
2473 continue;
48842b30 2474 }
48842b30 2475 }
5b4a0ec0 2476
48842b30
DG
2477 rcu_read_unlock();
2478
2479 return 0;
2480}
487cf67c 2481
8be98f9a
MD
2482/*
2483 * Start tracing for the UST session.
2484 */
2485int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2486{
2487 int ret = 0;
bec39940 2488 struct lttng_ht_iter iter;
8be98f9a
MD
2489 struct ust_app *app;
2490
2491 DBG("Stopping all UST traces");
2492
2493 rcu_read_lock();
2494
852d0037 2495 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2496 ret = ust_app_stop_trace(usess, app);
2497 if (ret < 0) {
2498 /* Continue to next apps even on error */
2499 continue;
2500 }
2501 }
2502
2503 rcu_read_unlock();
2504
2505 return 0;
2506}
2507
84cd17c6
MD
2508/*
2509 * Destroy app UST session.
2510 */
2511int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2512{
2513 int ret = 0;
bec39940 2514 struct lttng_ht_iter iter;
84cd17c6
MD
2515 struct ust_app *app;
2516
2517 DBG("Destroy all UST traces");
2518
2519 rcu_read_lock();
2520
852d0037 2521 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
84cd17c6
MD
2522 ret = ust_app_destroy_trace(usess, app);
2523 if (ret < 0) {
2524 /* Continue to next apps even on error */
2525 continue;
2526 }
2527 }
2528
2529 rcu_read_unlock();
2530
2531 return 0;
2532}
2533
5b4a0ec0
DG
2534/*
2535 * Add channels/events from UST global domain to registered apps at sock.
2536 */
487cf67c
DG
2537void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2538{
55c54cce 2539 int ret = 0;
727d5404 2540 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2541 struct ust_app *app;
2542 struct ust_app_session *ua_sess;
2543 struct ust_app_channel *ua_chan;
2544 struct ust_app_event *ua_event;
727d5404 2545 struct ust_app_ctx *ua_ctx;
1f3580c7
DG
2546
2547 if (usess == NULL) {
5b4a0ec0 2548 ERR("No UST session on global update. Returning");
1f3580c7
DG
2549 goto error;
2550 }
2551
a991f516
MD
2552 DBG2("UST app global update for app sock %d for session id %d", sock,
2553 usess->id);
487cf67c 2554
284d8f55
DG
2555 rcu_read_lock();
2556
487cf67c
DG
2557 app = find_app_by_sock(sock);
2558 if (app == NULL) {
2559 ERR("Failed to update app sock %d", sock);
2560 goto error;
2561 }
2562
e0c7ec2b
DG
2563 if (!app->compatible) {
2564 goto error;
2565 }
2566
421cb601 2567 ua_sess = create_ust_app_session(usess, app);
5b98a774
DG
2568 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2569 /* Tracer is gone for this session and has been freed */
487cf67c
DG
2570 goto error;
2571 }
2572
284d8f55
DG
2573 /*
2574 * We can iterate safely here over all UST app session sicne the create ust
2575 * app session above made a shadow copy of the UST global domain from the
2576 * ltt ust session.
2577 */
bec39940
DG
2578 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2579 node.node) {
284d8f55
DG
2580 ret = create_ust_channel(app, ua_sess, ua_chan);
2581 if (ret < 0) {
2582 /* FIXME: Should we quit here or continue... */
2583 continue;
487cf67c
DG
2584 }
2585
727d5404
DG
2586 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2587 node.node) {
2588 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2589 if (ret < 0) {
2590 /* FIXME: Should we quit here or continue... */
2591 continue;
2592 }
2593 }
2594
2595
284d8f55 2596 /* For each events */
bec39940
DG
2597 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2598 node.node) {
284d8f55
DG
2599 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2600 if (ret < 0) {
2601 /* FIXME: Should we quit here or continue... */
2602 continue;
487cf67c 2603 }
727d5404 2604
53a80697
MD
2605 ret = set_ust_event_filter(ua_event, app);
2606 if (ret < 0) {
2607 /* FIXME: Should we quit here or continue... */
2608 continue;
2609 }
36dc12cc 2610 }
487cf67c
DG
2611 }
2612
36dc12cc 2613 if (usess->start_trace) {
421cb601 2614 ret = ust_app_start_trace(usess, app);
36dc12cc 2615 if (ret < 0) {
36dc12cc
DG
2616 goto error;
2617 }
2618
852d0037 2619 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2620 }
2621
487cf67c
DG
2622error:
2623 rcu_read_unlock();
2624 return;
2625}
55cc08a6
DG
2626
2627/*
2628 * Add context to a specific channel for global UST domain.
2629 */
2630int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2631 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2632{
2633 int ret = 0;
bec39940
DG
2634 struct lttng_ht_node_str *ua_chan_node;
2635 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2636 struct ust_app_channel *ua_chan = NULL;
2637 struct ust_app_session *ua_sess;
2638 struct ust_app *app;
2639
2640 rcu_read_lock();
2641
852d0037 2642 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2643 if (!app->compatible) {
2644 /*
2645 * TODO: In time, we should notice the caller of this error by
2646 * telling him that this is a version error.
2647 */
2648 continue;
2649 }
55cc08a6
DG
2650 ua_sess = lookup_session_by_app(usess, app);
2651 if (ua_sess == NULL) {
2652 continue;
2653 }
2654
2655 /* Lookup channel in the ust app session */
bec39940
DG
2656 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2657 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2658 if (ua_chan_node == NULL) {
2659 continue;
2660 }
2661 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2662 node);
2663
2664 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2665 if (ret < 0) {
2666 continue;
2667 }
2668 }
2669
55cc08a6
DG
2670 rcu_read_unlock();
2671 return ret;
2672}
2673
53a80697
MD
2674/*
2675 * Add context to a specific event in a channel for global UST domain.
2676 */
2677int ust_app_set_filter_event_glb(struct ltt_ust_session *usess,
2678 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2679 struct lttng_filter_bytecode *bytecode)
2680{
2681 int ret = 0;
18eace3b 2682 struct lttng_ht_node_str *ua_chan_node;
53a80697
MD
2683 struct lttng_ht_iter iter, uiter;
2684 struct ust_app_session *ua_sess;
2685 struct ust_app_event *ua_event;
2686 struct ust_app_channel *ua_chan = NULL;
2687 struct ust_app *app;
2688
2689 rcu_read_lock();
2690
2691 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
2692 if (!app->compatible) {
2693 /*
2694 * TODO: In time, we should notice the caller of this error by
2695 * telling him that this is a version error.
2696 */
2697 continue;
2698 }
2699 ua_sess = lookup_session_by_app(usess, app);
2700 if (ua_sess == NULL) {
2701 continue;
2702 }
2703
2704 /* Lookup channel in the ust app session */
2705 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2706 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
2707 if (ua_chan_node == NULL) {
2708 continue;
2709 }
2710 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2711 node);
2712
18eace3b
DG
2713 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2714 (struct lttng_ust_filter_bytecode *) bytecode,
2715 uevent->attr.loglevel);
2716 if (ua_event == NULL) {
53a80697
MD
2717 continue;
2718 }
53a80697
MD
2719
2720 ret = set_ust_app_event_filter(ua_sess, ua_event, bytecode, app);
2721 if (ret < 0) {
2722 continue;
2723 }
2724 }
2725
2726 rcu_read_unlock();
2727 return ret;
2728}
2729
76d45b40
DG
2730/*
2731 * Enable event for a channel from a UST session for a specific PID.
2732 */
2733int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2734 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2735{
2736 int ret = 0;
bec39940 2737 struct lttng_ht_iter iter;
18eace3b 2738 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
2739 struct ust_app *app;
2740 struct ust_app_session *ua_sess;
2741 struct ust_app_channel *ua_chan;
2742 struct ust_app_event *ua_event;
2743
2744 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2745
2746 rcu_read_lock();
2747
2748 app = ust_app_find_by_pid(pid);
2749 if (app == NULL) {
2750 ERR("UST app enable event per PID %d not found", pid);
2751 ret = -1;
2752 goto error;
2753 }
2754
e0c7ec2b
DG
2755 if (!app->compatible) {
2756 ret = 0;
2757 goto error;
2758 }
2759
76d45b40
DG
2760 ua_sess = lookup_session_by_app(usess, app);
2761 /* If ua_sess is NULL, there is a code flow error */
2762 assert(ua_sess);
2763
2764 /* Lookup channel in the ust app session */
bec39940
DG
2765 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2766 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2767 /* If the channel is not found, there is a code flow error */
2768 assert(ua_chan_node);
2769
2770 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2771
18eace3b
DG
2772 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2773 uevent->filter, uevent->attr.loglevel);
2774 if (ua_event == NULL) {
76d45b40
DG
2775 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2776 if (ret < 0) {
2777 goto error;
2778 }
2779 } else {
76d45b40
DG
2780 ret = enable_ust_app_event(ua_sess, ua_event, app);
2781 if (ret < 0) {
2782 goto error;
2783 }
2784 }
2785
2786error:
2787 rcu_read_unlock();
2788 return ret;
2789}
7f79d3a1
DG
2790
2791/*
2792 * Disable event for a channel from a UST session for a specific PID.
2793 */
2794int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2795 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2796{
2797 int ret = 0;
bec39940
DG
2798 struct lttng_ht_iter iter;
2799 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2800 struct ust_app *app;
2801 struct ust_app_session *ua_sess;
2802 struct ust_app_channel *ua_chan;
2803 struct ust_app_event *ua_event;
2804
2805 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2806
2807 rcu_read_lock();
2808
2809 app = ust_app_find_by_pid(pid);
2810 if (app == NULL) {
2811 ERR("UST app disable event per PID %d not found", pid);
2812 ret = -1;
2813 goto error;
2814 }
2815
e0c7ec2b
DG
2816 if (!app->compatible) {
2817 ret = 0;
2818 goto error;
2819 }
2820
7f79d3a1
DG
2821 ua_sess = lookup_session_by_app(usess, app);
2822 /* If ua_sess is NULL, there is a code flow error */
2823 assert(ua_sess);
2824
2825 /* Lookup channel in the ust app session */
bec39940
DG
2826 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2827 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2828 if (ua_chan_node == NULL) {
2829 /* Channel does not exist, skip disabling */
2830 goto error;
2831 }
2832 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2833
bec39940
DG
2834 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2835 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2836 if (ua_event_node == NULL) {
2837 /* Event does not exist, skip disabling */
2838 goto error;
2839 }
2840 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2841
2842 ret = disable_ust_app_event(ua_sess, ua_event, app);
2843 if (ret < 0) {
2844 goto error;
2845 }
2846
2847error:
2848 rcu_read_unlock();
2849 return ret;
2850}
e0c7ec2b
DG
2851
2852/*
2853 * Validate version of UST apps and set the compatible bit.
2854 */
2855int ust_app_validate_version(int sock)
2856{
2857 int ret;
2858 struct ust_app *app;
2859
2860 rcu_read_lock();
2861
2862 app = find_app_by_sock(sock);
2863 assert(app);
2864
86acf0da
DG
2865 health_code_update(&health_thread_cmd);
2866
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DG
2867 ret = ustctl_tracer_version(sock, &app->version);
2868 if (ret < 0) {
2869 goto error;
2870 }
2871
2872 /* Validate version */
aee0cea0 2873 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2874 goto error;
2875 }
2876
68264071 2877 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2878 "(supporting == %d)", app->pid, app->version.major,
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DG
2879 UST_APP_MAJOR_VERSION);
2880 app->compatible = 1;
2881 rcu_read_unlock();
86acf0da 2882 health_code_update(&health_thread_cmd);
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DG
2883 return 0;
2884
2885error:
68264071 2886 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2887 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2888 UST_APP_MAJOR_VERSION);
2889 app->compatible = 0;
2890 rcu_read_unlock();
86acf0da 2891 health_code_update(&health_thread_cmd);
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DG
2892 return -1;
2893}
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2894
2895/*
2896 * Calibrate registered applications.
2897 */
2898int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2899{
2900 int ret = 0;
2901 struct lttng_ht_iter iter;
2902 struct ust_app *app;
2903
2904 rcu_read_lock();
2905
852d0037 2906 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2907 if (!app->compatible) {
2908 /*
2909 * TODO: In time, we should notice the caller of this error by
2910 * telling him that this is a version error.
2911 */
2912 continue;
2913 }
2914
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DG
2915 health_code_update(&health_thread_cmd);
2916
852d0037 2917 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2918 if (ret < 0) {
2919 switch (ret) {
2920 case -ENOSYS:
2921 /* Means that it's not implemented on the tracer side. */
2922 ret = 0;
2923 break;
2924 default:
2925 /* TODO: Report error to user */
2926 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2927 app->pid, ret);
4466912f
DG
2928 break;
2929 }
2930 }
2931 }
2932
2933 DBG("UST app global domain calibration finished");
2934
2935 rcu_read_unlock();
2936
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DG
2937 health_code_update(&health_thread_cmd);
2938
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DG
2939 return ret;
2940}
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