Tests: Fix sleep interruption in health stall test
[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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39/*
40 * Match function for the hash table lookup.
41 *
42 * It matches an ust app event based on three attributes which are the event
43 * name, the filter bytecode and the loglevel.
44 */
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45static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key)
46{
47 struct ust_app_event *event;
48 const struct ust_app_ht_key *key;
49
50 assert(node);
51 assert(_key);
52
53 event = caa_container_of(node, struct ust_app_event, node.node);
54 key = _key;
55
56 /* Match the 3 elements of the key: name, filter and loglevel. */
57
58 /* Event name */
59 if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
60 goto no_match;
61 }
62
63 /* Event loglevel. */
64 if (event->attr.loglevel != key->loglevel) {
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65 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
66 && key->loglevel == 0 && event->attr.loglevel == -1) {
67 /*
68 * Match is accepted. This is because on event creation, the
69 * loglevel is set to -1 if the event loglevel type is ALL so 0 and
70 * -1 are accepted for this loglevel type since 0 is the one set by
71 * the API when receiving an enable event.
72 */
73 } else {
74 goto no_match;
75 }
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76 }
77
78 /* One of the filters is NULL, fail. */
79 if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
80 goto no_match;
81 }
82
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83 if (key->filter && event->filter) {
84 /* Both filters exists, check length followed by the bytecode. */
85 if (event->filter->len != key->filter->len ||
86 memcmp(event->filter->data, key->filter->data,
87 event->filter->len) != 0) {
88 goto no_match;
89 }
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90 }
91
025faf73 92 /* Match. */
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93 return 1;
94
95no_match:
96 return 0;
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97}
98
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99/*
100 * Unique add of an ust app event in the given ht. This uses the custom
101 * ht_match_ust_app_event match function and the event name as hash.
102 */
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103static void add_unique_ust_app_event(struct lttng_ht *ht,
104 struct ust_app_event *event)
105{
106 struct cds_lfht_node *node_ptr;
107 struct ust_app_ht_key key;
108
109 assert(ht);
110 assert(ht->ht);
111 assert(event);
112
113 key.name = event->attr.name;
114 key.filter = event->filter;
115 key.loglevel = event->attr.loglevel;
116
117 node_ptr = cds_lfht_add_unique(ht->ht,
118 ht->hash_fct(event->node.key, lttng_ht_seed),
119 ht_match_ust_app_event, &key, &event->node.node);
120 assert(node_ptr == &event->node.node);
121}
122
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123/*
124 * Delete ust context safely. RCU read lock must be held before calling
125 * this function.
126 */
127static
128void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
129{
130 if (ua_ctx->obj) {
131 ustctl_release_object(sock, ua_ctx->obj);
132 free(ua_ctx->obj);
133 }
134 free(ua_ctx);
135}
136
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137/*
138 * Delete ust app event safely. RCU read lock must be held before calling
139 * this function.
140 */
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141static
142void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 143{
53a80697 144 free(ua_event->filter);
d80a6244 145
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146 if (ua_event->obj != NULL) {
147 ustctl_release_object(sock, ua_event->obj);
148 free(ua_event->obj);
149 }
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150 free(ua_event);
151}
152
153/*
154 * Delete ust app stream safely. RCU read lock must be held before calling
155 * this function.
156 */
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157static
158void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 159{
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160 if (stream->obj) {
161 ustctl_release_object(sock, stream->obj);
4063050c 162 lttng_fd_put(LTTNG_FD_APPS, 2);
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163 free(stream->obj);
164 }
84cd17c6 165 free(stream);
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166}
167
168/*
169 * Delete ust app channel safely. RCU read lock must be held before calling
170 * this function.
171 */
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172static
173void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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174{
175 int ret;
bec39940 176 struct lttng_ht_iter iter;
d80a6244 177 struct ust_app_event *ua_event;
55cc08a6 178 struct ust_app_ctx *ua_ctx;
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179 struct ltt_ust_stream *stream, *stmp;
180
55cc08a6 181 /* Wipe stream */
d80a6244 182 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 183 cds_list_del(&stream->list);
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184 delete_ust_app_stream(sock, stream);
185 }
186
55cc08a6 187 /* Wipe context */
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188 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
189 ret = lttng_ht_del(ua_chan->ctx, &iter);
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190 assert(!ret);
191 delete_ust_app_ctx(sock, ua_ctx);
192 }
bec39940 193 lttng_ht_destroy(ua_chan->ctx);
d80a6244 194
55cc08a6 195 /* Wipe events */
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196 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
197 node.node) {
198 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 199 assert(!ret);
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200 delete_ust_app_event(sock, ua_event);
201 }
bec39940 202 lttng_ht_destroy(ua_chan->events);
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203
204 if (ua_chan->obj != NULL) {
205 ustctl_release_object(sock, ua_chan->obj);
4063050c 206 lttng_fd_put(LTTNG_FD_APPS, 2);
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207 free(ua_chan->obj);
208 }
84cd17c6 209 free(ua_chan);
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210}
211
212/*
213 * Delete ust app session safely. RCU read lock must be held before calling
214 * this function.
215 */
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216static
217void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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218{
219 int ret;
bec39940 220 struct lttng_ht_iter iter;
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221 struct ust_app_channel *ua_chan;
222
223 if (ua_sess->metadata) {
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224 if (ua_sess->metadata->stream_obj) {
225 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
4063050c 226 lttng_fd_put(LTTNG_FD_APPS, 2);
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227 free(ua_sess->metadata->stream_obj);
228 }
229 if (ua_sess->metadata->obj) {
230 ustctl_release_object(sock, ua_sess->metadata->obj);
4063050c 231 lttng_fd_put(LTTNG_FD_APPS, 2);
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232 free(ua_sess->metadata->obj);
233 }
a2c0da86 234 trace_ust_destroy_metadata(ua_sess->metadata);
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235 }
236
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237 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
238 node.node) {
239 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 240 assert(!ret);
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241 delete_ust_app_channel(sock, ua_chan);
242 }
bec39940 243 lttng_ht_destroy(ua_sess->channels);
d80a6244 244
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MD
245 if (ua_sess->handle != -1) {
246 ustctl_release_handle(sock, ua_sess->handle);
247 }
8b366481 248 free(ua_sess);
d80a6244 249}
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250
251/*
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252 * Delete a traceable application structure from the global list. Never call
253 * this function outside of a call_rcu call.
91d76f53 254 */
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255static
256void delete_ust_app(struct ust_app *app)
91d76f53 257{
8b366481 258 int ret, sock;
d42f20df 259 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 260
f6a9efaa 261 rcu_read_lock();
44d3bd01 262
d80a6244 263 /* Delete ust app sessions info */
852d0037
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264 sock = app->sock;
265 app->sock = -1;
d80a6244 266
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267 lttng_ht_destroy(app->sessions);
268
8b366481 269 /* Wipe sessions */
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270 cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head,
271 teardown_node) {
272 /* Free every object in the session and the session. */
273 delete_ust_app_session(sock, ua_sess);
d80a6244 274 }
d80a6244 275
6414a713 276 /*
852d0037
DG
277 * Wait until we have deleted the application from the sock hash table
278 * before closing this socket, otherwise an application could re-use the
279 * socket ID and race with the teardown, using the same hash table entry.
280 *
281 * It's OK to leave the close in call_rcu. We want it to stay unique for
282 * all RCU readers that could run concurrently with unregister app,
283 * therefore we _need_ to only close that socket after a grace period. So
284 * it should stay in this RCU callback.
285 *
286 * This close() is a very important step of the synchronization model so
287 * every modification to this function must be carefully reviewed.
6414a713 288 */
799e2c4f
MD
289 ret = close(sock);
290 if (ret) {
291 PERROR("close");
292 }
4063050c 293 lttng_fd_put(LTTNG_FD_APPS, 1);
d80a6244 294
852d0037 295 DBG2("UST app pid %d deleted", app->pid);
284d8f55 296 free(app);
bec39940 297
f6a9efaa 298 rcu_read_unlock();
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299}
300
301/*
f6a9efaa 302 * URCU intermediate call to delete an UST app.
099e26bd 303 */
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304static
305void delete_ust_app_rcu(struct rcu_head *head)
099e26bd 306{
bec39940
DG
307 struct lttng_ht_node_ulong *node =
308 caa_container_of(head, struct lttng_ht_node_ulong, head);
f6a9efaa 309 struct ust_app *app =
852d0037 310 caa_container_of(node, struct ust_app, pid_n);
f6a9efaa 311
852d0037 312 DBG3("Call RCU deleting app PID %d", app->pid);
f6a9efaa 313 delete_ust_app(app);
099e26bd
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314}
315
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316/*
317 * Alloc new UST app session.
318 */
319static
320struct ust_app_session *alloc_ust_app_session(void)
321{
322 struct ust_app_session *ua_sess;
323
324 /* Init most of the default value by allocating and zeroing */
325 ua_sess = zmalloc(sizeof(struct ust_app_session));
326 if (ua_sess == NULL) {
327 PERROR("malloc");
328 goto error;
329 }
330
331 ua_sess->handle = -1;
bec39940 332 ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
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333
334 return ua_sess;
335
336error:
337 return NULL;
338}
339
340/*
341 * Alloc new UST app channel.
342 */
343static
344struct ust_app_channel *alloc_ust_app_channel(char *name,
345 struct lttng_ust_channel *attr)
346{
347 struct ust_app_channel *ua_chan;
348
349 /* Init most of the default value by allocating and zeroing */
350 ua_chan = zmalloc(sizeof(struct ust_app_channel));
351 if (ua_chan == NULL) {
352 PERROR("malloc");
353 goto error;
354 }
355
356 /* Setup channel name */
357 strncpy(ua_chan->name, name, sizeof(ua_chan->name));
358 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
359
360 ua_chan->enabled = 1;
361 ua_chan->handle = -1;
bec39940
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362 ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
363 ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
364 lttng_ht_node_init_str(&ua_chan->node, ua_chan->name);
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365
366 CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
367
368 /* Copy attributes */
369 if (attr) {
370 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
371 }
372
373 DBG3("UST app channel %s allocated", ua_chan->name);
374
375 return ua_chan;
376
377error:
378 return NULL;
379}
380
381/*
382 * Alloc new UST app event.
383 */
384static
385struct ust_app_event *alloc_ust_app_event(char *name,
386 struct lttng_ust_event *attr)
387{
388 struct ust_app_event *ua_event;
389
390 /* Init most of the default value by allocating and zeroing */
391 ua_event = zmalloc(sizeof(struct ust_app_event));
392 if (ua_event == NULL) {
393 PERROR("malloc");
394 goto error;
395 }
396
397 ua_event->enabled = 1;
398 strncpy(ua_event->name, name, sizeof(ua_event->name));
399 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
bec39940 400 lttng_ht_node_init_str(&ua_event->node, ua_event->name);
8b366481
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401
402 /* Copy attributes */
403 if (attr) {
404 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
405 }
406
407 DBG3("UST app event %s allocated", ua_event->name);
408
409 return ua_event;
410
411error:
412 return NULL;
413}
414
415/*
416 * Alloc new UST app context.
417 */
418static
419struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
420{
421 struct ust_app_ctx *ua_ctx;
422
423 ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
424 if (ua_ctx == NULL) {
425 goto error;
426 }
427
428 if (uctx) {
429 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
430 }
431
432 DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
433
434error:
435 return ua_ctx;
436}
437
025faf73
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438/*
439 * Allocate a filter and copy the given original filter.
440 *
441 * Return allocated filter or NULL on error.
442 */
443static struct lttng_ust_filter_bytecode *alloc_copy_ust_app_filter(
444 struct lttng_ust_filter_bytecode *orig_f)
445{
446 struct lttng_ust_filter_bytecode *filter = NULL;
447
448 /* Copy filter bytecode */
449 filter = zmalloc(sizeof(*filter) + orig_f->len);
450 if (!filter) {
451 PERROR("zmalloc alloc ust app filter");
452 goto error;
453 }
454
455 memcpy(filter, orig_f, sizeof(*filter) + orig_f->len);
456
457error:
458 return filter;
459}
460
099e26bd 461/*
421cb601
DG
462 * Find an ust_app using the sock and return it. RCU read side lock must be
463 * held before calling this helper function.
099e26bd 464 */
8b366481
DG
465static
466struct ust_app *find_app_by_sock(int sock)
099e26bd 467{
bec39940 468 struct lttng_ht_node_ulong *node;
bec39940 469 struct lttng_ht_iter iter;
f6a9efaa 470
852d0037 471 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 472 node = lttng_ht_iter_get_node_ulong(&iter);
f6a9efaa
DG
473 if (node == NULL) {
474 DBG2("UST app find by sock %d not found", sock);
f6a9efaa
DG
475 goto error;
476 }
852d0037
DG
477
478 return caa_container_of(node, struct ust_app, sock_n);
f6a9efaa
DG
479
480error:
481 return NULL;
099e26bd
DG
482}
483
025faf73
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484/*
485 * Lookup for an ust app event based on event name, filter bytecode and the
486 * event loglevel.
487 *
488 * Return an ust_app_event object or NULL on error.
489 */
18eace3b
DG
490static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht,
491 char *name, struct lttng_ust_filter_bytecode *filter, int loglevel)
492{
493 struct lttng_ht_iter iter;
494 struct lttng_ht_node_str *node;
495 struct ust_app_event *event = NULL;
496 struct ust_app_ht_key key;
18eace3b
DG
497
498 assert(name);
499 assert(ht);
500
501 /* Setup key for event lookup. */
502 key.name = name;
503 key.filter = filter;
504 key.loglevel = loglevel;
505
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506 /* Lookup using the event name as hash and a custom match fct. */
507 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
508 ht_match_ust_app_event, &key, &iter.iter);
18eace3b
DG
509 node = lttng_ht_iter_get_node_str(&iter);
510 if (node == NULL) {
511 goto end;
512 }
513
514 event = caa_container_of(node, struct ust_app_event, node);
515
516end:
18eace3b
DG
517 return event;
518}
519
55cc08a6
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520/*
521 * Create the channel context on the tracer.
522 */
523static
524int create_ust_channel_context(struct ust_app_channel *ua_chan,
525 struct ust_app_ctx *ua_ctx, struct ust_app *app)
526{
527 int ret;
528
86acf0da
DG
529 health_code_update(&health_thread_cmd);
530
852d0037 531 ret = ustctl_add_context(app->sock, &ua_ctx->ctx,
55cc08a6
DG
532 ua_chan->obj, &ua_ctx->obj);
533 if (ret < 0) {
534 goto error;
535 }
536
537 ua_ctx->handle = ua_ctx->obj->handle;
538
727d5404 539 DBG2("UST app context created successfully for channel %s", ua_chan->name);
55cc08a6
DG
540
541error:
86acf0da 542 health_code_update(&health_thread_cmd);
55cc08a6
DG
543 return ret;
544}
545
53a80697
MD
546/*
547 * Set the filter on the tracer.
548 */
549static
550int set_ust_event_filter(struct ust_app_event *ua_event,
551 struct ust_app *app)
552{
553 int ret;
554
86acf0da
DG
555 health_code_update(&health_thread_cmd);
556
53a80697 557 if (!ua_event->filter) {
86acf0da
DG
558 ret = 0;
559 goto error;
53a80697
MD
560 }
561
562 ret = ustctl_set_filter(app->sock, ua_event->filter,
563 ua_event->obj);
564 if (ret < 0) {
565 goto error;
566 }
567
568 DBG2("UST filter set successfully for event %s", ua_event->name);
569
570error:
86acf0da 571 health_code_update(&health_thread_cmd);
53a80697
MD
572 return ret;
573}
574
9730260e
DG
575/*
576 * Disable the specified event on to UST tracer for the UST session.
577 */
578static int disable_ust_event(struct ust_app *app,
579 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
580{
581 int ret;
582
86acf0da
DG
583 health_code_update(&health_thread_cmd);
584
852d0037 585 ret = ustctl_disable(app->sock, ua_event->obj);
9730260e
DG
586 if (ret < 0) {
587 ERR("UST app event %s disable failed for app (pid: %d) "
588 "and session handle %d with ret %d",
852d0037 589 ua_event->attr.name, app->pid, ua_sess->handle, ret);
9730260e
DG
590 goto error;
591 }
592
593 DBG2("UST app event %s disabled successfully for app (pid: %d)",
852d0037 594 ua_event->attr.name, app->pid);
9730260e
DG
595
596error:
86acf0da 597 health_code_update(&health_thread_cmd);
9730260e
DG
598 return ret;
599}
600
78f0bacd
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601/*
602 * Disable the specified channel on to UST tracer for the UST session.
603 */
604static int disable_ust_channel(struct ust_app *app,
605 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
606{
607 int ret;
608
86acf0da
DG
609 health_code_update(&health_thread_cmd);
610
852d0037 611 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
DG
612 if (ret < 0) {
613 ERR("UST app channel %s disable failed for app (pid: %d) "
614 "and session handle %d with ret %d",
852d0037 615 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
616 goto error;
617 }
618
78f0bacd 619 DBG2("UST app channel %s disabled successfully for app (pid: %d)",
852d0037 620 ua_chan->name, app->pid);
78f0bacd
DG
621
622error:
86acf0da 623 health_code_update(&health_thread_cmd);
78f0bacd
DG
624 return ret;
625}
626
627/*
628 * Enable the specified channel on to UST tracer for the UST session.
629 */
630static int enable_ust_channel(struct ust_app *app,
631 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
632{
633 int ret;
634
86acf0da
DG
635 health_code_update(&health_thread_cmd);
636
852d0037 637 ret = ustctl_enable(app->sock, ua_chan->obj);
78f0bacd
DG
638 if (ret < 0) {
639 ERR("UST app channel %s enable failed for app (pid: %d) "
640 "and session handle %d with ret %d",
852d0037 641 ua_chan->name, app->pid, ua_sess->handle, ret);
78f0bacd
DG
642 goto error;
643 }
644
645 ua_chan->enabled = 1;
646
647 DBG2("UST app channel %s enabled successfully for app (pid: %d)",
852d0037 648 ua_chan->name, app->pid);
78f0bacd
DG
649
650error:
86acf0da 651 health_code_update(&health_thread_cmd);
78f0bacd
DG
652 return ret;
653}
654
edb67388
DG
655/*
656 * Enable the specified event on to UST tracer for the UST session.
657 */
658static int enable_ust_event(struct ust_app *app,
659 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
660{
661 int ret;
662
86acf0da
DG
663 health_code_update(&health_thread_cmd);
664
852d0037 665 ret = ustctl_enable(app->sock, ua_event->obj);
edb67388
DG
666 if (ret < 0) {
667 ERR("UST app event %s enable failed for app (pid: %d) "
668 "and session handle %d with ret %d",
852d0037 669 ua_event->attr.name, app->pid, ua_sess->handle, ret);
edb67388
DG
670 goto error;
671 }
672
673 DBG2("UST app event %s enabled successfully for app (pid: %d)",
852d0037 674 ua_event->attr.name, app->pid);
edb67388
DG
675
676error:
86acf0da 677 health_code_update(&health_thread_cmd);
edb67388
DG
678 return ret;
679}
680
099e26bd 681/*
5b4a0ec0 682 * Open metadata onto the UST tracer for a UST session.
0177d773 683 */
5b4a0ec0
DG
684static int open_ust_metadata(struct ust_app *app,
685 struct ust_app_session *ua_sess)
0177d773 686{
5b4a0ec0
DG
687 int ret;
688 struct lttng_ust_channel_attr uattr;
0177d773 689
86acf0da
DG
690 health_code_update(&health_thread_cmd);
691
5b4a0ec0
DG
692 uattr.overwrite = ua_sess->metadata->attr.overwrite;
693 uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
694 uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
695 uattr.switch_timer_interval =
696 ua_sess->metadata->attr.switch_timer_interval;
697 uattr.read_timer_interval =
698 ua_sess->metadata->attr.read_timer_interval;
699 uattr.output = ua_sess->metadata->attr.output;
700
4063050c
MD
701 /* We are going to receive 2 fds, we need to reserve them. */
702 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
703 if (ret < 0) {
704 ERR("Exhausted number of available FD upon metadata open");
705 goto error;
706 }
5b4a0ec0 707 /* UST tracer metadata creation */
852d0037 708 ret = ustctl_open_metadata(app->sock, ua_sess->handle, &uattr,
5b4a0ec0
DG
709 &ua_sess->metadata->obj);
710 if (ret < 0) {
fc34caaa 711 ERR("UST app open metadata failed for app pid:%d with ret %d",
852d0037 712 app->pid, ret);
f6a9efaa 713 goto error;
0177d773 714 }
f6a9efaa 715
6d3686da
DG
716 ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
717
f6a9efaa 718error:
86acf0da 719 health_code_update(&health_thread_cmd);
5b4a0ec0 720 return ret;
91d76f53
DG
721}
722
723/*
5b4a0ec0 724 * Create stream onto the UST tracer for a UST session.
91d76f53 725 */
5b4a0ec0
DG
726static int create_ust_stream(struct ust_app *app,
727 struct ust_app_session *ua_sess)
91d76f53 728{
5b4a0ec0 729 int ret;
421cb601 730
86acf0da
DG
731 health_code_update(&health_thread_cmd);
732
4063050c
MD
733 /* We are going to receive 2 fds, we need to reserve them. */
734 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
735 if (ret < 0) {
736 ERR("Exhausted number of available FD upon metadata stream create");
737 goto error;
738 }
852d0037 739 ret = ustctl_create_stream(app->sock, ua_sess->metadata->obj,
5b4a0ec0
DG
740 &ua_sess->metadata->stream_obj);
741 if (ret < 0) {
742 ERR("UST create metadata stream failed");
421cb601 743 goto error;
91d76f53 744 }
421cb601 745
421cb601 746error:
86acf0da 747 health_code_update(&health_thread_cmd);
5b4a0ec0 748 return ret;
91d76f53
DG
749}
750
b551a063 751/*
5b4a0ec0 752 * Create the specified channel onto the UST tracer for a UST session.
b551a063 753 */
5b4a0ec0
DG
754static int create_ust_channel(struct ust_app *app,
755 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
b551a063 756{
5b4a0ec0 757 int ret;
b551a063 758
86acf0da
DG
759 health_code_update(&health_thread_cmd);
760
5b4a0ec0 761 /* TODO: remove cast and use lttng-ust-abi.h */
4063050c
MD
762
763 /* We are going to receive 2 fds, we need to reserve them. */
764 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
765 if (ret < 0) {
766 ERR("Exhausted number of available FD upon create channel");
767 goto error;
768 }
86acf0da
DG
769
770 health_code_update(&health_thread_cmd);
771
852d0037 772 ret = ustctl_create_channel(app->sock, ua_sess->handle,
5b4a0ec0
DG
773 (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
774 if (ret < 0) {
58f3ca76 775 ERR("Creating channel %s for app (pid: %d, sock: %d) "
5b4a0ec0 776 "and session handle %d with ret %d",
852d0037 777 ua_chan->name, app->pid, app->sock,
5b4a0ec0 778 ua_sess->handle, ret);
4063050c 779 lttng_fd_put(LTTNG_FD_APPS, 2);
b551a063
DG
780 goto error;
781 }
782
5b4a0ec0 783 ua_chan->handle = ua_chan->obj->handle;
b551a063 784
5b4a0ec0 785 DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
852d0037 786 ua_chan->name, app->pid, app->sock);
b551a063 787
86acf0da
DG
788 health_code_update(&health_thread_cmd);
789
8535a6d9
DG
790 /* If channel is not enabled, disable it on the tracer */
791 if (!ua_chan->enabled) {
792 ret = disable_ust_channel(app, ua_sess, ua_chan);
793 if (ret < 0) {
794 goto error;
795 }
796 }
797
b551a063 798error:
86acf0da 799 health_code_update(&health_thread_cmd);
b551a063
DG
800 return ret;
801}
802
91d76f53 803/*
5b4a0ec0 804 * Create the specified event onto the UST tracer for a UST session.
91d76f53 805 */
edb67388
DG
806static
807int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
808 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
91d76f53 809{
5b4a0ec0 810 int ret = 0;
284d8f55 811
86acf0da
DG
812 health_code_update(&health_thread_cmd);
813
5b4a0ec0 814 /* Create UST event on tracer */
852d0037 815 ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj,
5b4a0ec0
DG
816 &ua_event->obj);
817 if (ret < 0) {
818 ERR("Error ustctl create event %s for app pid: %d with ret %d",
852d0037 819 ua_event->attr.name, app->pid, ret);
5b4a0ec0 820 goto error;
91d76f53 821 }
f6a9efaa 822
5b4a0ec0 823 ua_event->handle = ua_event->obj->handle;
284d8f55 824
5b4a0ec0 825 DBG2("UST app event %s created successfully for pid:%d",
852d0037 826 ua_event->attr.name, app->pid);
f6a9efaa 827
86acf0da
DG
828 health_code_update(&health_thread_cmd);
829
025faf73
DG
830 /* Set filter if one is present. */
831 if (ua_event->filter) {
832 ret = set_ust_event_filter(ua_event, app);
833 if (ret < 0) {
834 goto error;
835 }
836 }
837
8535a6d9 838 /* If event not enabled, disable it on the tracer */
fc34caaa 839 if (ua_event->enabled == 0) {
8535a6d9
DG
840 ret = disable_ust_event(app, ua_sess, ua_event);
841 if (ret < 0) {
fc34caaa
DG
842 /*
843 * If we hit an EPERM, something is wrong with our disable call. If
844 * we get an EEXIST, there is a problem on the tracer side since we
845 * just created it.
846 */
847 switch (ret) {
49c336c1 848 case -LTTNG_UST_ERR_PERM:
fc34caaa
DG
849 /* Code flow problem */
850 assert(0);
49c336c1 851 case -LTTNG_UST_ERR_EXIST:
fc34caaa
DG
852 /* It's OK for our use case. */
853 ret = 0;
854 break;
855 default:
856 break;
857 }
8535a6d9
DG
858 goto error;
859 }
860 }
861
5b4a0ec0 862error:
86acf0da 863 health_code_update(&health_thread_cmd);
5b4a0ec0 864 return ret;
91d76f53 865}
48842b30 866
5b4a0ec0
DG
867/*
868 * Copy data between an UST app event and a LTT event.
869 */
421cb601 870static void shadow_copy_event(struct ust_app_event *ua_event,
48842b30
DG
871 struct ltt_ust_event *uevent)
872{
873 strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
874 ua_event->name[sizeof(ua_event->name) - 1] = '\0';
875
fc34caaa
DG
876 ua_event->enabled = uevent->enabled;
877
5b4a0ec0
DG
878 /* Copy event attributes */
879 memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
880
53a80697
MD
881 /* Copy filter bytecode */
882 if (uevent->filter) {
025faf73
DG
883 ua_event->filter = alloc_copy_ust_app_filter(uevent->filter);
884 /* Filter might be NULL here in case of ENONEM. */
53a80697 885 }
48842b30
DG
886}
887
5b4a0ec0
DG
888/*
889 * Copy data between an UST app channel and a LTT channel.
890 */
421cb601 891static void shadow_copy_channel(struct ust_app_channel *ua_chan,
48842b30
DG
892 struct ltt_ust_channel *uchan)
893{
bec39940 894 struct lttng_ht_iter iter;
48842b30 895 struct ltt_ust_event *uevent;
55cc08a6 896 struct ltt_ust_context *uctx;
48842b30 897 struct ust_app_event *ua_event;
55cc08a6 898 struct ust_app_ctx *ua_ctx;
48842b30 899
fc34caaa 900 DBG2("UST app shadow copy of channel %s started", ua_chan->name);
48842b30
DG
901
902 strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
903 ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
5b4a0ec0
DG
904 /* Copy event attributes */
905 memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
48842b30 906
fc34caaa
DG
907 ua_chan->enabled = uchan->enabled;
908
bec39940 909 cds_lfht_for_each_entry(uchan->ctx->ht, &iter.iter, uctx, node.node) {
55cc08a6
DG
910 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
911 if (ua_ctx == NULL) {
912 continue;
913 }
bec39940
DG
914 lttng_ht_node_init_ulong(&ua_ctx->node,
915 (unsigned long) ua_ctx->ctx.ctx);
916 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6 917 }
48842b30 918
421cb601 919 /* Copy all events from ltt ust channel to ust app channel */
bec39940 920 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
18eace3b
DG
921 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
922 uevent->filter, uevent->attr.loglevel);
923 if (ua_event == NULL) {
421cb601 924 DBG2("UST event %s not found on shadow copy channel",
48842b30 925 uevent->attr.name);
284d8f55 926 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
48842b30 927 if (ua_event == NULL) {
5b4a0ec0 928 continue;
48842b30 929 }
421cb601 930 shadow_copy_event(ua_event, uevent);
18eace3b 931 add_unique_ust_app_event(ua_chan->events, ua_event);
48842b30 932 }
48842b30
DG
933 }
934
fc34caaa 935 DBG3("UST app shadow copy of channel %s done", ua_chan->name);
48842b30
DG
936}
937
5b4a0ec0
DG
938/*
939 * Copy data between a UST app session and a regular LTT session.
940 */
421cb601 941static void shadow_copy_session(struct ust_app_session *ua_sess,
bec39940 942 struct ltt_ust_session *usess, struct ust_app *app)
48842b30 943{
bec39940
DG
944 struct lttng_ht_node_str *ua_chan_node;
945 struct lttng_ht_iter iter;
48842b30
DG
946 struct ltt_ust_channel *uchan;
947 struct ust_app_channel *ua_chan;
477d7741
MD
948 time_t rawtime;
949 struct tm *timeinfo;
950 char datetime[16];
951 int ret;
952
953 /* Get date and time for unique app path */
954 time(&rawtime);
955 timeinfo = localtime(&rawtime);
956 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
48842b30 957
421cb601 958 DBG2("Shadow copy of session handle %d", ua_sess->handle);
48842b30 959
a991f516 960 ua_sess->id = usess->id;
6df2e2c9
MD
961 ua_sess->uid = usess->uid;
962 ua_sess->gid = usess->gid;
48842b30 963
00e2e675
DG
964 ret = snprintf(ua_sess->path, PATH_MAX, "%s-%d-%s/", app->name, app->pid,
965 datetime);
477d7741
MD
966 if (ret < 0) {
967 PERROR("asprintf UST shadow copy session");
968 /* TODO: We cannot return an error from here.. */
969 assert(0);
970 }
971
48842b30
DG
972 /* TODO: support all UST domain */
973
974 /* Iterate over all channels in global domain. */
bec39940
DG
975 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
976 uchan, node.node) {
977 struct lttng_ht_iter uiter;
ba767faf 978
bec39940
DG
979 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
980 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
5b4a0ec0 981 if (ua_chan_node != NULL) {
fc34caaa 982 /* Session exist. Contiuing. */
5b4a0ec0
DG
983 continue;
984 }
421cb601 985
5b4a0ec0
DG
986 DBG2("Channel %s not found on shadow session copy, creating it",
987 uchan->name);
988 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
989 if (ua_chan == NULL) {
fc34caaa 990 /* malloc failed FIXME: Might want to do handle ENOMEM .. */
5b4a0ec0 991 continue;
48842b30
DG
992 }
993
5b4a0ec0 994 shadow_copy_channel(ua_chan, uchan);
bec39940 995 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
48842b30
DG
996 }
997}
998
78f0bacd
DG
999/*
1000 * Lookup sesison wrapper.
1001 */
84cd17c6
MD
1002static
1003void __lookup_session_by_app(struct ltt_ust_session *usess,
bec39940 1004 struct ust_app *app, struct lttng_ht_iter *iter)
84cd17c6
MD
1005{
1006 /* Get right UST app session from app */
2c348c10 1007 lttng_ht_lookup(app->sessions, (void *)((unsigned long) usess->id), iter);
84cd17c6
MD
1008}
1009
421cb601
DG
1010/*
1011 * Return ust app session from the app session hashtable using the UST session
a991f516 1012 * id.
421cb601 1013 */
48842b30
DG
1014static struct ust_app_session *lookup_session_by_app(
1015 struct ltt_ust_session *usess, struct ust_app *app)
1016{
bec39940
DG
1017 struct lttng_ht_iter iter;
1018 struct lttng_ht_node_ulong *node;
48842b30 1019
84cd17c6 1020 __lookup_session_by_app(usess, app, &iter);
bec39940 1021 node = lttng_ht_iter_get_node_ulong(&iter);
48842b30
DG
1022 if (node == NULL) {
1023 goto error;
1024 }
1025
1026 return caa_container_of(node, struct ust_app_session, node);
1027
1028error:
1029 return NULL;
1030}
1031
421cb601
DG
1032/*
1033 * Create a UST session onto the tracer of app and add it the session
1034 * hashtable.
1035 *
1036 * Return ust app session or NULL on error.
1037 */
1038static struct ust_app_session *create_ust_app_session(
1039 struct ltt_ust_session *usess, struct ust_app *app)
1040{
1041 int ret;
1042 struct ust_app_session *ua_sess;
1043
86acf0da
DG
1044 health_code_update(&health_thread_cmd);
1045
421cb601
DG
1046 ua_sess = lookup_session_by_app(usess, app);
1047 if (ua_sess == NULL) {
a991f516 1048 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 1049 app->pid, usess->id);
421cb601
DG
1050 ua_sess = alloc_ust_app_session();
1051 if (ua_sess == NULL) {
1052 /* Only malloc can failed so something is really wrong */
fc34caaa 1053 goto end;
421cb601 1054 }
477d7741 1055 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
1056 }
1057
86acf0da
DG
1058 health_code_update(&health_thread_cmd);
1059
421cb601 1060 if (ua_sess->handle == -1) {
852d0037 1061 ret = ustctl_create_session(app->sock);
421cb601 1062 if (ret < 0) {
852d0037 1063 ERR("Creating session for app pid %d", app->pid);
0f83395d 1064 delete_ust_app_session(-1, ua_sess);
915d047c
DG
1065 /* This means that the tracer is gone... */
1066 ua_sess = (void*) -1UL;
0f83395d 1067 goto end;
421cb601
DG
1068 }
1069
421cb601
DG
1070 ua_sess->handle = ret;
1071
1072 /* Add ust app session to app's HT */
2c348c10 1073 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 1074 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
1075
1076 DBG2("UST app session created successfully with handle %d", ret);
1077 }
1078
fc34caaa 1079end:
86acf0da 1080 health_code_update(&health_thread_cmd);
421cb601 1081 return ua_sess;
421cb601
DG
1082}
1083
55cc08a6
DG
1084/*
1085 * Create a context for the channel on the tracer.
1086 */
1087static
1088int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1089 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1090 struct ust_app *app)
1091{
1092 int ret = 0;
bec39940
DG
1093 struct lttng_ht_iter iter;
1094 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1095 struct ust_app_ctx *ua_ctx;
1096
1097 DBG2("UST app adding context to channel %s", ua_chan->name);
1098
bec39940
DG
1099 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1100 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1101 if (node != NULL) {
1102 ret = -EEXIST;
1103 goto error;
1104 }
1105
1106 ua_ctx = alloc_ust_app_ctx(uctx);
1107 if (ua_ctx == NULL) {
1108 /* malloc failed */
1109 ret = -1;
1110 goto error;
1111 }
1112
bec39940
DG
1113 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1114 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1115
1116 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1117 if (ret < 0) {
1118 goto error;
1119 }
1120
1121error:
1122 return ret;
1123}
1124
edb67388
DG
1125/*
1126 * Enable on the tracer side a ust app event for the session and channel.
1127 */
1128static
1129int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1130 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1131{
1132 int ret;
1133
1134 ret = enable_ust_event(app, ua_sess, ua_event);
1135 if (ret < 0) {
1136 goto error;
1137 }
1138
1139 ua_event->enabled = 1;
1140
1141error:
1142 return ret;
1143}
1144
9730260e
DG
1145/*
1146 * Disable on the tracer side a ust app event for the session and channel.
1147 */
1148static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1149 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1150{
1151 int ret;
1152
1153 ret = disable_ust_event(app, ua_sess, ua_event);
1154 if (ret < 0) {
1155 goto error;
1156 }
1157
1158 ua_event->enabled = 0;
1159
1160error:
1161 return ret;
1162}
1163
78f0bacd
DG
1164/*
1165 * Lookup ust app channel for session and disable it on the tracer side.
1166 */
8535a6d9
DG
1167static
1168int disable_ust_app_channel(struct ust_app_session *ua_sess,
1169 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1170{
8535a6d9 1171 int ret;
78f0bacd
DG
1172
1173 ret = disable_ust_channel(app, ua_sess, ua_chan);
1174 if (ret < 0) {
1175 goto error;
1176 }
1177
8535a6d9
DG
1178 ua_chan->enabled = 0;
1179
78f0bacd
DG
1180error:
1181 return ret;
1182}
1183
1184/*
1185 * Lookup ust app channel for session and enable it on the tracer side.
1186 */
1187static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1188 struct ltt_ust_channel *uchan, struct ust_app *app)
1189{
1190 int ret = 0;
bec39940
DG
1191 struct lttng_ht_iter iter;
1192 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1193 struct ust_app_channel *ua_chan;
1194
bec39940
DG
1195 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1196 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1197 if (ua_chan_node == NULL) {
a991f516
MD
1198 DBG2("Unable to find channel %s in ust session id %u",
1199 uchan->name, ua_sess->id);
78f0bacd
DG
1200 goto error;
1201 }
1202
1203 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1204
1205 ret = enable_ust_channel(app, ua_sess, ua_chan);
1206 if (ret < 0) {
1207 goto error;
1208 }
1209
1210error:
1211 return ret;
1212}
1213
284d8f55 1214/*
5b4a0ec0 1215 * Create UST app channel and create it on the tracer.
284d8f55 1216 */
5b4a0ec0
DG
1217static struct ust_app_channel *create_ust_app_channel(
1218 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1219 struct ust_app *app)
1220{
1221 int ret = 0;
bec39940
DG
1222 struct lttng_ht_iter iter;
1223 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1224 struct ust_app_channel *ua_chan;
1225
1226 /* Lookup channel in the ust app session */
bec39940
DG
1227 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1228 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1229 if (ua_chan_node != NULL) {
5b4a0ec0 1230 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1231 goto end;
5b4a0ec0
DG
1232 }
1233
fc34caaa
DG
1234 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1235 if (ua_chan == NULL) {
1236 /* Only malloc can fail here */
1237 goto error;
1238 }
1239 shadow_copy_channel(ua_chan, uchan);
1240
5b4a0ec0
DG
1241 ret = create_ust_channel(app, ua_sess, ua_chan);
1242 if (ret < 0) {
fc34caaa 1243 /* Not found previously means that it does not exist on the tracer */
49c336c1 1244 assert(ret != -LTTNG_UST_ERR_EXIST);
5b4a0ec0
DG
1245 goto error;
1246 }
1247
58f3ca76
DG
1248 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1249
fc34caaa 1250 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1251 app->pid);
fc34caaa
DG
1252
1253end:
5b4a0ec0
DG
1254 return ua_chan;
1255
1256error:
fc34caaa 1257 delete_ust_app_channel(-1, ua_chan);
5b4a0ec0
DG
1258 return NULL;
1259}
1260
1261/*
1262 * Create UST app event and create it on the tracer side.
1263 */
edb67388
DG
1264static
1265int create_ust_app_event(struct ust_app_session *ua_sess,
1266 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1267 struct ust_app *app)
284d8f55 1268{
edb67388 1269 int ret = 0;
5b4a0ec0 1270 struct ust_app_event *ua_event;
284d8f55 1271
5b4a0ec0 1272 /* Get event node */
18eace3b
DG
1273 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1274 uevent->filter, uevent->attr.loglevel);
1275 if (ua_event != NULL) {
fc34caaa 1276 ret = -EEXIST;
edb67388
DG
1277 goto end;
1278 }
5b4a0ec0 1279
edb67388
DG
1280 /* Does not exist so create one */
1281 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1282 if (ua_event == NULL) {
1283 /* Only malloc can failed so something is really wrong */
1284 ret = -ENOMEM;
fc34caaa 1285 goto end;
5b4a0ec0 1286 }
edb67388 1287 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1288
edb67388 1289 /* Create it on the tracer side */
5b4a0ec0 1290 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1291 if (ret < 0) {
fc34caaa 1292 /* Not found previously means that it does not exist on the tracer */
76f66f63 1293 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
1294 goto error;
1295 }
1296
18eace3b 1297 add_unique_ust_app_event(ua_chan->events, ua_event);
284d8f55 1298
fc34caaa 1299 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1300 app->pid);
7f79d3a1 1301
edb67388 1302end:
fc34caaa
DG
1303 return ret;
1304
5b4a0ec0 1305error:
fc34caaa
DG
1306 /* Valid. Calling here is already in a read side lock */
1307 delete_ust_app_event(-1, ua_event);
edb67388 1308 return ret;
5b4a0ec0
DG
1309}
1310
1311/*
1312 * Create UST metadata and open it on the tracer side.
1313 */
1314static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1315 char *pathname, struct ust_app *app)
1316{
1317 int ret = 0;
1318
1319 if (ua_sess->metadata == NULL) {
1320 /* Allocate UST metadata */
1321 ua_sess->metadata = trace_ust_create_metadata(pathname);
1322 if (ua_sess->metadata == NULL) {
fc34caaa 1323 /* malloc() failed */
5b4a0ec0
DG
1324 goto error;
1325 }
1326
1327 ret = open_ust_metadata(app, ua_sess);
1328 if (ret < 0) {
7db205b5
DG
1329 DBG3("Opening metadata failed. Cleaning up memory");
1330
fc34caaa
DG
1331 /* Cleanup failed metadata struct */
1332 free(ua_sess->metadata);
7db205b5
DG
1333 /*
1334 * This is very important because delete_ust_app_session check if
1335 * the pointer is null or not in order to delete the metadata.
1336 */
1337 ua_sess->metadata = NULL;
5b4a0ec0
DG
1338 goto error;
1339 }
1340
852d0037 1341 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1342 }
1343
1344 /* Open UST metadata stream */
1345 if (ua_sess->metadata->stream_obj == NULL) {
1346 ret = create_ust_stream(app, ua_sess);
1347 if (ret < 0) {
1348 goto error;
1349 }
1350
477d7741
MD
1351 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1352 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1353 if (ret < 0) {
1354 PERROR("asprintf UST create stream");
1355 goto error;
1356 }
1357
1358 DBG2("UST metadata stream object created for app pid %d",
852d0037 1359 app->pid);
5b4a0ec0
DG
1360 } else {
1361 ERR("Attempting to create stream without metadata opened");
1362 goto error;
1363 }
1364
1365 return 0;
1366
1367error:
1368 return -1;
1369}
1370
1371/*
1372 * Return pointer to traceable apps list.
1373 */
bec39940 1374struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1375{
1376 return ust_app_ht;
1377}
1378
1379/*
1380 * Return ust app pointer or NULL if not found.
1381 */
1382struct ust_app *ust_app_find_by_pid(pid_t pid)
1383{
bec39940
DG
1384 struct lttng_ht_node_ulong *node;
1385 struct lttng_ht_iter iter;
5b4a0ec0
DG
1386
1387 rcu_read_lock();
bec39940
DG
1388 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1389 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1390 if (node == NULL) {
1391 DBG2("UST app no found with pid %d", pid);
1392 goto error;
1393 }
1394 rcu_read_unlock();
1395
1396 DBG2("Found UST app by pid %d", pid);
1397
852d0037 1398 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1399
1400error:
1401 rcu_read_unlock();
1402 return NULL;
1403}
1404
1405/*
1406 * Using pid and uid (of the app), allocate a new ust_app struct and
1407 * add it to the global traceable app list.
1408 *
0df502fd
MD
1409 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1410 * bitness is not supported.
5b4a0ec0
DG
1411 */
1412int ust_app_register(struct ust_register_msg *msg, int sock)
1413{
1414 struct ust_app *lta;
799e2c4f 1415 int ret;
5b4a0ec0 1416
173af62f
DG
1417 if ((msg->bits_per_long == 64 &&
1418 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1419 || (msg->bits_per_long == 32 &&
1420 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1421 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1422 "%d-bit long, but no consumerd for this long size is available.\n",
1423 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1424 ret = close(sock);
1425 if (ret) {
1426 PERROR("close");
1427 }
4063050c 1428 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1429 return -EINVAL;
1430 }
3f2c5fcc
MD
1431 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1432 ERR("Registration failed: application \"%s\" (pid: %d) has "
1433 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1434 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1435 ret = close(sock);
1436 if (ret) {
1437 PERROR("close");
1438 }
4063050c 1439 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1440 return -EINVAL;
1441 }
5b4a0ec0
DG
1442 lta = zmalloc(sizeof(struct ust_app));
1443 if (lta == NULL) {
1444 PERROR("malloc");
1445 return -ENOMEM;
1446 }
1447
1448 lta->ppid = msg->ppid;
1449 lta->uid = msg->uid;
1450 lta->gid = msg->gid;
e0c7ec2b 1451 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1452 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1453 lta->v_major = msg->major;
1454 lta->v_minor = msg->minor;
1455 strncpy(lta->name, msg->name, sizeof(lta->name));
1456 lta->name[16] = '\0';
bec39940 1457 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1458
852d0037
DG
1459 lta->pid = msg->pid;
1460 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1461 lta->sock = sock;
1462 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0 1463
d42f20df
DG
1464 CDS_INIT_LIST_HEAD(&lta->teardown_head);
1465
5b4a0ec0 1466 rcu_read_lock();
852d0037
DG
1467
1468 /*
1469 * On a re-registration, we want to kick out the previous registration of
1470 * that pid
1471 */
1472 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1473
1474 /*
1475 * The socket _should_ be unique until _we_ call close. So, a add_unique
1476 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1477 * already in the table.
1478 */
1479 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1480
5b4a0ec0
DG
1481 rcu_read_unlock();
1482
1483 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1484 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1485 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1486
1487 return 0;
1488}
1489
1490/*
1491 * Unregister app by removing it from the global traceable app list and freeing
1492 * the data struct.
1493 *
1494 * The socket is already closed at this point so no close to sock.
1495 */
1496void ust_app_unregister(int sock)
1497{
1498 struct ust_app *lta;
bec39940
DG
1499 struct lttng_ht_node_ulong *node;
1500 struct lttng_ht_iter iter;
d42f20df 1501 struct ust_app_session *ua_sess;
525b0740 1502 int ret;
5b4a0ec0
DG
1503
1504 rcu_read_lock();
886459c6 1505
5b4a0ec0 1506 /* Get the node reference for a call_rcu */
852d0037 1507 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1508 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1509 if (node == NULL) {
852d0037 1510 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1511 goto error;
1512 }
284d8f55 1513
852d0037
DG
1514 lta = caa_container_of(node, struct ust_app, sock_n);
1515
1516 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1517
886459c6 1518 /* Remove application from PID hash table */
852d0037
DG
1519 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1520 assert(!ret);
1521
1522 /* Assign second node for deletion */
1523 iter.iter.node = &lta->pid_n.node;
1524
5b98a774
DG
1525 /*
1526 * Ignore return value since the node might have been removed before by an
1527 * add replace during app registration because the PID can be reassigned by
1528 * the OS.
1529 */
bec39940 1530 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
1531 if (ret) {
1532 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1533 lta->pid);
1534 }
852d0037 1535
d42f20df
DG
1536 /* Remove sessions so they are not visible during deletion.*/
1537 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
1538 node.node) {
1539 ret = lttng_ht_del(lta->sessions, &iter);
1540 if (ret) {
1541 /* The session was already removed so scheduled for teardown. */
1542 continue;
1543 }
1544
1545 /*
1546 * Add session to list for teardown. This is safe since at this point we
1547 * are the only one using this list.
1548 */
1549 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
1550 }
1551
852d0037
DG
1552 /* Free memory */
1553 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1554
284d8f55 1555error:
5b4a0ec0
DG
1556 rcu_read_unlock();
1557 return;
284d8f55
DG
1558}
1559
1560/*
5b4a0ec0 1561 * Return traceable_app_count
284d8f55 1562 */
5b4a0ec0 1563unsigned long ust_app_list_count(void)
284d8f55 1564{
5b4a0ec0 1565 unsigned long count;
284d8f55 1566
5b4a0ec0 1567 rcu_read_lock();
bec39940 1568 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1569 rcu_read_unlock();
284d8f55 1570
5b4a0ec0 1571 return count;
284d8f55
DG
1572}
1573
5b4a0ec0
DG
1574/*
1575 * Fill events array with all events name of all registered apps.
1576 */
1577int ust_app_list_events(struct lttng_event **events)
421cb601 1578{
5b4a0ec0
DG
1579 int ret, handle;
1580 size_t nbmem, count = 0;
bec39940 1581 struct lttng_ht_iter iter;
5b4a0ec0
DG
1582 struct ust_app *app;
1583 struct lttng_event *tmp;
421cb601 1584
5b4a0ec0
DG
1585 nbmem = UST_APP_EVENT_LIST_SIZE;
1586 tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1587 if (tmp == NULL) {
1588 PERROR("zmalloc ust app events");
1589 ret = -ENOMEM;
421cb601
DG
1590 goto error;
1591 }
1592
5b4a0ec0 1593 rcu_read_lock();
421cb601 1594
852d0037 1595 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1596 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1597
86acf0da
DG
1598 health_code_update(&health_thread_cmd);
1599
e0c7ec2b
DG
1600 if (!app->compatible) {
1601 /*
1602 * TODO: In time, we should notice the caller of this error by
1603 * telling him that this is a version error.
1604 */
1605 continue;
1606 }
852d0037 1607 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1608 if (handle < 0) {
1609 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1610 app->pid);
5b4a0ec0
DG
1611 continue;
1612 }
421cb601 1613
852d0037 1614 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 1615 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1616 health_code_update(&health_thread_cmd);
815564d8 1617 if (count >= nbmem) {
d7b3776f
DG
1618 /* In case the realloc fails, we free the memory */
1619 void *tmp_ptr = (void *) tmp;
815564d8
MD
1620 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1621 2 * nbmem);
1622 nbmem *= 2;
2f221590 1623 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
5b4a0ec0
DG
1624 if (tmp == NULL) {
1625 PERROR("realloc ust app events");
d7b3776f 1626 free(tmp_ptr);
5b4a0ec0
DG
1627 ret = -ENOMEM;
1628 goto rcu_error;
1629 }
1630 }
90eaa0d2 1631 memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
8005f29a 1632 tmp[count].loglevel = uiter.loglevel;
6775595e 1633 tmp[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
852d0037 1634 tmp[count].pid = app->pid;
5b4a0ec0
DG
1635 tmp[count].enabled = -1;
1636 count++;
421cb601 1637 }
421cb601
DG
1638 }
1639
5b4a0ec0
DG
1640 ret = count;
1641 *events = tmp;
421cb601 1642
5b4a0ec0 1643 DBG2("UST app list events done (%zu events)", count);
421cb601 1644
5b4a0ec0
DG
1645rcu_error:
1646 rcu_read_unlock();
421cb601 1647error:
86acf0da 1648 health_code_update(&health_thread_cmd);
5b4a0ec0 1649 return ret;
421cb601
DG
1650}
1651
f37d259d
MD
1652/*
1653 * Fill events array with all events name of all registered apps.
1654 */
1655int ust_app_list_event_fields(struct lttng_event_field **fields)
1656{
1657 int ret, handle;
1658 size_t nbmem, count = 0;
1659 struct lttng_ht_iter iter;
1660 struct ust_app *app;
1661 struct lttng_event_field *tmp;
1662
1663 nbmem = UST_APP_EVENT_LIST_SIZE;
1664 tmp = zmalloc(nbmem * sizeof(struct lttng_event_field));
1665 if (tmp == NULL) {
1666 PERROR("zmalloc ust app event fields");
1667 ret = -ENOMEM;
1668 goto error;
1669 }
1670
1671 rcu_read_lock();
1672
1673 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1674 struct lttng_ust_field_iter uiter;
1675
86acf0da
DG
1676 health_code_update(&health_thread_cmd);
1677
f37d259d
MD
1678 if (!app->compatible) {
1679 /*
1680 * TODO: In time, we should notice the caller of this error by
1681 * telling him that this is a version error.
1682 */
1683 continue;
1684 }
1685 handle = ustctl_tracepoint_field_list(app->sock);
1686 if (handle < 0) {
1687 ERR("UST app list event fields getting handle failed for app pid %d",
1688 app->pid);
1689 continue;
1690 }
1691
1692 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 1693 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1694 health_code_update(&health_thread_cmd);
f37d259d 1695 if (count >= nbmem) {
d7b3776f
DG
1696 /* In case the realloc fails, we free the memory */
1697 void *tmp_ptr = (void *) tmp;
f37d259d
MD
1698 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1699 2 * nbmem);
1700 nbmem *= 2;
1701 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event_field));
1702 if (tmp == NULL) {
1703 PERROR("realloc ust app event fields");
d7b3776f 1704 free(tmp_ptr);
f37d259d
MD
1705 ret = -ENOMEM;
1706 goto rcu_error;
1707 }
1708 }
f37d259d
MD
1709
1710 memcpy(tmp[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1711 tmp[count].type = uiter.type;
590b9e3c 1712 tmp[count].nowrite = uiter.nowrite;
f37d259d
MD
1713
1714 memcpy(tmp[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1715 tmp[count].event.loglevel = uiter.loglevel;
1716 tmp[count].event.type = LTTNG_UST_TRACEPOINT;
1717 tmp[count].event.pid = app->pid;
1718 tmp[count].event.enabled = -1;
1719 count++;
1720 }
1721 }
1722
1723 ret = count;
1724 *fields = tmp;
1725
1726 DBG2("UST app list event fields done (%zu events)", count);
1727
1728rcu_error:
1729 rcu_read_unlock();
1730error:
86acf0da 1731 health_code_update(&health_thread_cmd);
f37d259d
MD
1732 return ret;
1733}
1734
5b4a0ec0
DG
1735/*
1736 * Free and clean all traceable apps of the global list.
1737 */
1738void ust_app_clean_list(void)
421cb601 1739{
5b4a0ec0 1740 int ret;
659ed79f 1741 struct ust_app *app;
bec39940 1742 struct lttng_ht_iter iter;
421cb601 1743
5b4a0ec0 1744 DBG2("UST app cleaning registered apps hash table");
421cb601 1745
5b4a0ec0 1746 rcu_read_lock();
421cb601 1747
659ed79f 1748 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1749 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1750 assert(!ret);
659ed79f 1751 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1752 }
1753
852d0037 1754 /* Cleanup socket hash table */
659ed79f
DG
1755 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1756 sock_n.node) {
852d0037 1757 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1758 assert(!ret);
1759 }
852d0037 1760
bec39940 1761 /* Destroy is done only when the ht is empty */
852d0037
DG
1762 lttng_ht_destroy(ust_app_ht);
1763 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1764
5b4a0ec0
DG
1765 rcu_read_unlock();
1766}
1767
1768/*
1769 * Init UST app hash table.
1770 */
1771void ust_app_ht_alloc(void)
1772{
bec39940 1773 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1774 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1775}
1776
78f0bacd
DG
1777/*
1778 * For a specific UST session, disable the channel for all registered apps.
1779 */
35a9059d 1780int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1781 struct ltt_ust_channel *uchan)
1782{
1783 int ret = 0;
bec39940
DG
1784 struct lttng_ht_iter iter;
1785 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1786 struct ust_app *app;
1787 struct ust_app_session *ua_sess;
8535a6d9 1788 struct ust_app_channel *ua_chan;
78f0bacd
DG
1789
1790 if (usess == NULL || uchan == NULL) {
1791 ERR("Disabling UST global channel with NULL values");
1792 ret = -1;
1793 goto error;
1794 }
1795
a991f516
MD
1796 DBG2("UST app disabling channel %s from global domain for session id %d",
1797 uchan->name, usess->id);
78f0bacd
DG
1798
1799 rcu_read_lock();
1800
1801 /* For every registered applications */
852d0037 1802 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1803 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1804 if (!app->compatible) {
1805 /*
1806 * TODO: In time, we should notice the caller of this error by
1807 * telling him that this is a version error.
1808 */
1809 continue;
1810 }
78f0bacd
DG
1811 ua_sess = lookup_session_by_app(usess, app);
1812 if (ua_sess == NULL) {
1813 continue;
1814 }
1815
8535a6d9 1816 /* Get channel */
bec39940
DG
1817 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1818 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1819 /* If the session if found for the app, the channel must be there */
1820 assert(ua_chan_node);
1821
1822 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1823 /* The channel must not be already disabled */
1824 assert(ua_chan->enabled == 1);
1825
1826 /* Disable channel onto application */
1827 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1828 if (ret < 0) {
1829 /* XXX: We might want to report this error at some point... */
1830 continue;
1831 }
1832 }
1833
1834 rcu_read_unlock();
1835
1836error:
1837 return ret;
1838}
1839
1840/*
1841 * For a specific UST session, enable the channel for all registered apps.
1842 */
35a9059d 1843int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1844 struct ltt_ust_channel *uchan)
1845{
1846 int ret = 0;
bec39940 1847 struct lttng_ht_iter iter;
78f0bacd
DG
1848 struct ust_app *app;
1849 struct ust_app_session *ua_sess;
1850
1851 if (usess == NULL || uchan == NULL) {
1852 ERR("Adding UST global channel to NULL values");
1853 ret = -1;
1854 goto error;
1855 }
1856
a991f516
MD
1857 DBG2("UST app enabling channel %s to global domain for session id %d",
1858 uchan->name, usess->id);
78f0bacd
DG
1859
1860 rcu_read_lock();
1861
1862 /* For every registered applications */
852d0037 1863 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1864 if (!app->compatible) {
1865 /*
1866 * TODO: In time, we should notice the caller of this error by
1867 * telling him that this is a version error.
1868 */
1869 continue;
1870 }
78f0bacd
DG
1871 ua_sess = lookup_session_by_app(usess, app);
1872 if (ua_sess == NULL) {
1873 continue;
1874 }
1875
1876 /* Enable channel onto application */
1877 ret = enable_ust_app_channel(ua_sess, uchan, app);
1878 if (ret < 0) {
1879 /* XXX: We might want to report this error at some point... */
1880 continue;
1881 }
1882 }
1883
1884 rcu_read_unlock();
1885
1886error:
1887 return ret;
1888}
1889
b0a40d28
DG
1890/*
1891 * Disable an event in a channel and for a specific session.
1892 */
35a9059d
DG
1893int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1894 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1895{
1896 int ret = 0;
bec39940
DG
1897 struct lttng_ht_iter iter, uiter;
1898 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1899 struct ust_app *app;
1900 struct ust_app_session *ua_sess;
1901 struct ust_app_channel *ua_chan;
1902 struct ust_app_event *ua_event;
1903
1904 DBG("UST app disabling event %s for all apps in channel "
a991f516 1905 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1906
1907 rcu_read_lock();
1908
1909 /* For all registered applications */
852d0037 1910 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1911 if (!app->compatible) {
1912 /*
1913 * TODO: In time, we should notice the caller of this error by
1914 * telling him that this is a version error.
1915 */
1916 continue;
1917 }
b0a40d28
DG
1918 ua_sess = lookup_session_by_app(usess, app);
1919 if (ua_sess == NULL) {
1920 /* Next app */
1921 continue;
1922 }
1923
1924 /* Lookup channel in the ust app session */
bec39940
DG
1925 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1926 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1927 if (ua_chan_node == NULL) {
a991f516 1928 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1929 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1930 continue;
1931 }
1932 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1933
bec39940
DG
1934 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1935 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1936 if (ua_event_node == NULL) {
1937 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1938 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1939 continue;
1940 }
1941 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1942
7f79d3a1 1943 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1944 if (ret < 0) {
1945 /* XXX: Report error someday... */
1946 continue;
1947 }
1948 }
1949
1950 rcu_read_unlock();
1951
1952 return ret;
1953}
1954
9730260e 1955/*
edb67388 1956 * For a specific UST session and UST channel, the event for all
9730260e
DG
1957 * registered apps.
1958 */
35a9059d 1959int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1960 struct ltt_ust_channel *uchan)
1961{
1962 int ret = 0;
bec39940
DG
1963 struct lttng_ht_iter iter, uiter;
1964 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1965 struct ust_app *app;
1966 struct ust_app_session *ua_sess;
1967 struct ust_app_channel *ua_chan;
1968 struct ust_app_event *ua_event;
1969
1970 DBG("UST app disabling all event for all apps in channel "
a991f516 1971 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1972
1973 rcu_read_lock();
1974
1975 /* For all registered applications */
852d0037 1976 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1977 if (!app->compatible) {
1978 /*
1979 * TODO: In time, we should notice the caller of this error by
1980 * telling him that this is a version error.
1981 */
1982 continue;
1983 }
9730260e 1984 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
1985 if (!ua_sess) {
1986 /* The application has problem or is probably dead. */
1987 continue;
1988 }
9730260e
DG
1989
1990 /* Lookup channel in the ust app session */
bec39940
DG
1991 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1992 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
1993 /* If the channel is not found, there is a code flow error */
1994 assert(ua_chan_node);
1995
9730260e
DG
1996 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1997
1998 /* Disable each events of channel */
bec39940
DG
1999 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2000 node.node) {
7f79d3a1 2001 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
2002 if (ret < 0) {
2003 /* XXX: Report error someday... */
2004 continue;
2005 }
2006 }
2007 }
2008
2009 rcu_read_unlock();
2010
2011 return ret;
2012}
2013
421cb601 2014/*
5b4a0ec0 2015 * For a specific UST session, create the channel for all registered apps.
421cb601 2016 */
35a9059d 2017int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
2018 struct ltt_ust_channel *uchan)
2019{
3c14c33f 2020 int ret = 0;
bec39940 2021 struct lttng_ht_iter iter;
48842b30
DG
2022 struct ust_app *app;
2023 struct ust_app_session *ua_sess;
2024 struct ust_app_channel *ua_chan;
2025
fc34caaa
DG
2026 /* Very wrong code flow */
2027 assert(usess);
2028 assert(uchan);
421cb601 2029
a991f516
MD
2030 DBG2("UST app adding channel %s to global domain for session id %d",
2031 uchan->name, usess->id);
48842b30
DG
2032
2033 rcu_read_lock();
421cb601 2034
5b4a0ec0 2035 /* For every registered applications */
852d0037 2036 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2037 if (!app->compatible) {
2038 /*
2039 * TODO: In time, we should notice the caller of this error by
2040 * telling him that this is a version error.
2041 */
2042 continue;
2043 }
edb67388
DG
2044 /*
2045 * Create session on the tracer side and add it to app session HT. Note
2046 * that if session exist, it will simply return a pointer to the ust
2047 * app session.
2048 */
421cb601 2049 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2050 if (ua_sess == NULL) {
915d047c 2051 /* The malloc() failed. */
3c14c33f 2052 ret = -1;
95e047ff 2053 goto error_rcu_unlock;
915d047c
DG
2054 } else if (ua_sess == (void *) -1UL) {
2055 /* The application's socket is not valid. Contiuing */
3c14c33f 2056 ret = -1;
915d047c 2057 continue;
48842b30
DG
2058 }
2059
421cb601
DG
2060 /* Create channel onto application */
2061 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
2062 if (ua_chan == NULL) {
fc34caaa 2063 /* Major problem here and it's maybe the tracer or malloc() */
3c14c33f 2064 ret = -1;
95e047ff 2065 goto error_rcu_unlock;
48842b30 2066 }
48842b30 2067 }
5b4a0ec0 2068
95e047ff 2069error_rcu_unlock:
48842b30 2070 rcu_read_unlock();
3c14c33f 2071 return ret;
48842b30
DG
2072}
2073
5b4a0ec0 2074/*
edb67388 2075 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2076 */
35a9059d 2077int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2078 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2079{
2080 int ret = 0;
bec39940 2081 struct lttng_ht_iter iter, uiter;
18eace3b 2082 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
2083 struct ust_app *app;
2084 struct ust_app_session *ua_sess;
2085 struct ust_app_channel *ua_chan;
2086 struct ust_app_event *ua_event;
48842b30 2087
a991f516
MD
2088 DBG("UST app enabling event %s for all apps for session id %d",
2089 uevent->attr.name, usess->id);
48842b30 2090
edb67388
DG
2091 /*
2092 * NOTE: At this point, this function is called only if the session and
2093 * channel passed are already created for all apps. and enabled on the
2094 * tracer also.
2095 */
2096
48842b30 2097 rcu_read_lock();
421cb601
DG
2098
2099 /* For all registered applications */
852d0037 2100 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2101 if (!app->compatible) {
2102 /*
2103 * TODO: In time, we should notice the caller of this error by
2104 * telling him that this is a version error.
2105 */
2106 continue;
2107 }
edb67388 2108 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2109 if (!ua_sess) {
2110 /* The application has problem or is probably dead. */
2111 continue;
2112 }
ba767faf 2113
edb67388 2114 /* Lookup channel in the ust app session */
bec39940
DG
2115 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2116 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2117 /* If the channel is not found, there is a code flow error */
2118 assert(ua_chan_node);
2119
2120 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2121
18eace3b
DG
2122 /* Get event node */
2123 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2124 uevent->filter, uevent->attr.loglevel);
2125 if (ua_event == NULL) {
7f79d3a1 2126 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2127 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2128 continue;
2129 }
35a9059d
DG
2130
2131 ret = enable_ust_app_event(ua_sess, ua_event, app);
2132 if (ret < 0) {
7f79d3a1 2133 goto error;
48842b30 2134 }
edb67388
DG
2135 }
2136
7f79d3a1 2137error:
edb67388 2138 rcu_read_unlock();
edb67388
DG
2139 return ret;
2140}
2141
2142/*
2143 * For a specific existing UST session and UST channel, creates the event for
2144 * all registered apps.
2145 */
35a9059d 2146int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2147 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2148{
2149 int ret = 0;
bec39940
DG
2150 struct lttng_ht_iter iter, uiter;
2151 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2152 struct ust_app *app;
2153 struct ust_app_session *ua_sess;
2154 struct ust_app_channel *ua_chan;
2155
a991f516
MD
2156 DBG("UST app creating event %s for all apps for session id %d",
2157 uevent->attr.name, usess->id);
edb67388 2158
edb67388
DG
2159 rcu_read_lock();
2160
2161 /* For all registered applications */
852d0037 2162 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2163 if (!app->compatible) {
2164 /*
2165 * TODO: In time, we should notice the caller of this error by
2166 * telling him that this is a version error.
2167 */
2168 continue;
2169 }
edb67388 2170 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2171 if (!ua_sess) {
2172 /* The application has problem or is probably dead. */
2173 continue;
2174 }
48842b30
DG
2175
2176 /* Lookup channel in the ust app session */
bec39940
DG
2177 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2178 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2179 /* If the channel is not found, there is a code flow error */
2180 assert(ua_chan_node);
2181
48842b30
DG
2182 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2183
edb67388
DG
2184 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2185 if (ret < 0) {
49c336c1 2186 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
2187 /* Possible value at this point: -ENOMEM. If so, we stop! */
2188 break;
2189 }
2190 DBG2("UST app event %s already exist on app PID %d",
852d0037 2191 uevent->attr.name, app->pid);
5b4a0ec0 2192 continue;
48842b30 2193 }
48842b30 2194 }
5b4a0ec0 2195
48842b30
DG
2196 rcu_read_unlock();
2197
2198 return ret;
2199}
2200
5b4a0ec0
DG
2201/*
2202 * Start tracing for a specific UST session and app.
2203 */
421cb601 2204int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2205{
2206 int ret = 0;
bec39940 2207 struct lttng_ht_iter iter;
48842b30
DG
2208 struct ust_app_session *ua_sess;
2209 struct ust_app_channel *ua_chan;
5b4a0ec0 2210 struct ltt_ust_stream *ustream;
173af62f 2211 struct consumer_socket *socket;
48842b30 2212
852d0037 2213 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2214
509cbaf8
MD
2215 rcu_read_lock();
2216
e0c7ec2b
DG
2217 if (!app->compatible) {
2218 goto end;
2219 }
2220
421cb601
DG
2221 ua_sess = lookup_session_by_app(usess, app);
2222 if (ua_sess == NULL) {
d42f20df
DG
2223 /* The session is in teardown process. Ignore and continue. */
2224 goto end;
421cb601 2225 }
48842b30 2226
aea829b3
DG
2227 /* Upon restart, we skip the setup, already done */
2228 if (ua_sess->started) {
8be98f9a 2229 goto skip_setup;
aea829b3 2230 }
8be98f9a 2231
a4b92340
DG
2232 /* Create directories if consumer is LOCAL and has a path defined. */
2233 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2234 strlen(usess->consumer->dst.trace_path) > 0) {
2235 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2236 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2237 if (ret < 0) {
2238 if (ret != -EEXIST) {
2239 ERR("Trace directory creation error");
2240 ret = -1;
2241 goto error_rcu_unlock;
2242 }
2243 }
2244 }
2245
f848c3eb
DG
2246 /* Indicate that the session has been started once */
2247 ua_sess->started = 1;
2248
421cb601
DG
2249 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2250 if (ret < 0) {
f73fabfd 2251 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2252 goto error_rcu_unlock;
421cb601 2253 }
48842b30 2254
421cb601 2255 /* For each channel */
bec39940
DG
2256 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2257 node.node) {
421cb601
DG
2258 /* Create all streams */
2259 while (1) {
5b4a0ec0 2260 /* Create UST stream */
421cb601
DG
2261 ustream = zmalloc(sizeof(*ustream));
2262 if (ustream == NULL) {
2263 PERROR("zmalloc ust stream");
509cbaf8 2264 goto error_rcu_unlock;
421cb601 2265 }
48842b30 2266
4063050c
MD
2267 /* We are going to receive 2 fds, we need to reserve them. */
2268 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2269 if (ret < 0) {
2270 ERR("Exhausted number of available FD upon stream create");
2271 free(ustream);
2272 goto error_rcu_unlock;
2273 }
86acf0da
DG
2274
2275 health_code_update(&health_thread_cmd);
2276
852d0037 2277 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2278 &ustream->obj);
48842b30 2279 if (ret < 0) {
421cb601 2280 /* Got all streams */
4063050c 2281 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2282 free(ustream);
f73fabfd 2283 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2284 break;
48842b30 2285 }
421cb601 2286 ustream->handle = ustream->obj->handle;
48842b30 2287
86acf0da
DG
2288 health_code_update(&health_thread_cmd);
2289
421cb601
DG
2290 /* Order is important */
2291 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2292 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2293 ua_chan->name, ua_chan->streams.count);
2294 ua_chan->streams.count++;
aba8e916
DG
2295 if (ret < 0) {
2296 PERROR("asprintf UST create stream");
a2c0da86
MD
2297 /*
2298 * XXX what should we do here with the
2299 * stream ?
2300 */
421cb601 2301 continue;
aba8e916 2302 }
00e2e675
DG
2303 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2304 ustream->handle);
421cb601 2305 }
86acf0da
DG
2306
2307 health_code_update(&health_thread_cmd);
421cb601 2308 }
aba8e916 2309
7753dea8
MD
2310 switch (app->bits_per_long) {
2311 case 64:
173af62f
DG
2312 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2313 usess->consumer);
2314 if (socket == NULL) {
2315 goto skip_setup;
2316 }
7753dea8
MD
2317 break;
2318 case 32:
173af62f
DG
2319 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2320 usess->consumer);
2321 if (socket == NULL) {
2322 goto skip_setup;
2323 }
7753dea8
MD
2324 break;
2325 default:
2326 ret = -EINVAL;
2327 goto error_rcu_unlock;
2328 }
aea829b3 2329
421cb601 2330 /* Setup UST consumer socket and send fds to it */
173af62f 2331 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2332 if (ret < 0) {
509cbaf8 2333 goto error_rcu_unlock;
421cb601 2334 }
48842b30 2335
86acf0da
DG
2336 health_code_update(&health_thread_cmd);
2337
8be98f9a 2338skip_setup:
421cb601 2339 /* This start the UST tracing */
852d0037 2340 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2341 if (ret < 0) {
852d0037 2342 ERR("Error starting tracing for app pid: %d", app->pid);
509cbaf8 2343 goto error_rcu_unlock;
421cb601 2344 }
5b4a0ec0 2345
86acf0da
DG
2346 health_code_update(&health_thread_cmd);
2347
421cb601 2348 /* Quiescent wait after starting trace */
852d0037 2349 ustctl_wait_quiescent(app->sock);
48842b30 2350
e0c7ec2b
DG
2351end:
2352 rcu_read_unlock();
86acf0da 2353 health_code_update(&health_thread_cmd);
421cb601 2354 return 0;
48842b30 2355
509cbaf8
MD
2356error_rcu_unlock:
2357 rcu_read_unlock();
86acf0da 2358 health_code_update(&health_thread_cmd);
421cb601
DG
2359 return -1;
2360}
48842b30 2361
8be98f9a
MD
2362/*
2363 * Stop tracing for a specific UST session and app.
2364 */
2365int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2366{
2367 int ret = 0;
bec39940 2368 struct lttng_ht_iter iter;
8be98f9a 2369 struct ust_app_session *ua_sess;
6d3686da 2370 struct ust_app_channel *ua_chan;
8be98f9a 2371
852d0037 2372 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2373
2374 rcu_read_lock();
2375
e0c7ec2b
DG
2376 if (!app->compatible) {
2377 goto end;
2378 }
2379
8be98f9a
MD
2380 ua_sess = lookup_session_by_app(usess, app);
2381 if (ua_sess == NULL) {
d42f20df 2382 goto end;
8be98f9a
MD
2383 }
2384
9bc07046
DG
2385 /*
2386 * If started = 0, it means that stop trace has been called for a session
2387 * that was never started. This is a code flow error and should never
2388 * happen.
2389 */
2390 assert(ua_sess->started == 1);
7db205b5 2391
86acf0da
DG
2392 health_code_update(&health_thread_cmd);
2393
9d6c7d3f 2394 /* This inhibits UST tracing */
852d0037 2395 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2396 if (ret < 0) {
852d0037 2397 ERR("Error stopping tracing for app pid: %d", app->pid);
9d6c7d3f
DG
2398 goto error_rcu_unlock;
2399 }
2400
86acf0da
DG
2401 health_code_update(&health_thread_cmd);
2402
9d6c7d3f 2403 /* Quiescent wait after stopping trace */
852d0037 2404 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2405
86acf0da
DG
2406 health_code_update(&health_thread_cmd);
2407
9d6c7d3f 2408 /* Flushing buffers */
bec39940
DG
2409 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2410 node.node) {
86acf0da 2411 health_code_update(&health_thread_cmd);
852d0037 2412 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2413 if (ret < 0) {
7db205b5 2414 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2415 app->pid, ua_chan->name, ret);
6d3686da
DG
2416 /* Continuing flushing all buffers */
2417 continue;
8be98f9a
MD
2418 }
2419 }
8be98f9a 2420
86acf0da
DG
2421 health_code_update(&health_thread_cmd);
2422
90d97d10 2423 /* Flush all buffers before stopping */
852d0037 2424 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2425 if (ret < 0) {
852d0037 2426 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2427 ret);
90d97d10
DG
2428 }
2429
7db205b5
DG
2430end:
2431 rcu_read_unlock();
86acf0da 2432 health_code_update(&health_thread_cmd);
8be98f9a
MD
2433 return 0;
2434
2435error_rcu_unlock:
2436 rcu_read_unlock();
86acf0da 2437 health_code_update(&health_thread_cmd);
8be98f9a
MD
2438 return -1;
2439}
2440
84cd17c6
MD
2441/*
2442 * Destroy a specific UST session in apps.
2443 */
3353de95 2444static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6
MD
2445{
2446 struct ust_app_session *ua_sess;
2447 struct lttng_ust_object_data obj;
bec39940
DG
2448 struct lttng_ht_iter iter;
2449 struct lttng_ht_node_ulong *node;
525b0740 2450 int ret;
84cd17c6 2451
852d0037 2452 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2453
2454 rcu_read_lock();
2455
e0c7ec2b
DG
2456 if (!app->compatible) {
2457 goto end;
2458 }
2459
84cd17c6 2460 __lookup_session_by_app(usess, app, &iter);
bec39940 2461 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6 2462 if (node == NULL) {
d42f20df
DG
2463 /* Session is being or is deleted. */
2464 goto end;
84cd17c6
MD
2465 }
2466 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2467 ret = lttng_ht_del(app->sessions, &iter);
c4a1715b
DG
2468 if (ret) {
2469 /* Already scheduled for teardown. */
2470 goto end;
2471 }
2472
84cd17c6
MD
2473 obj.handle = ua_sess->handle;
2474 obj.shm_fd = -1;
2475 obj.wait_fd = -1;
2476 obj.memory_map_size = 0;
86acf0da 2477 health_code_update(&health_thread_cmd);
852d0037 2478 ustctl_release_object(app->sock, &obj);
84cd17c6 2479
86acf0da 2480 health_code_update(&health_thread_cmd);
852d0037 2481 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2482
84cd17c6 2483 /* Quiescent wait after stopping trace */
852d0037 2484 ustctl_wait_quiescent(app->sock);
84cd17c6 2485
e0c7ec2b
DG
2486end:
2487 rcu_read_unlock();
86acf0da 2488 health_code_update(&health_thread_cmd);
84cd17c6 2489 return 0;
84cd17c6
MD
2490}
2491
5b4a0ec0
DG
2492/*
2493 * Start tracing for the UST session.
2494 */
421cb601
DG
2495int ust_app_start_trace_all(struct ltt_ust_session *usess)
2496{
2497 int ret = 0;
bec39940 2498 struct lttng_ht_iter iter;
421cb601 2499 struct ust_app *app;
48842b30 2500
421cb601
DG
2501 DBG("Starting all UST traces");
2502
2503 rcu_read_lock();
421cb601 2504
852d0037 2505 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2506 ret = ust_app_start_trace(usess, app);
48842b30 2507 if (ret < 0) {
5b4a0ec0
DG
2508 /* Continue to next apps even on error */
2509 continue;
48842b30 2510 }
48842b30 2511 }
5b4a0ec0 2512
48842b30
DG
2513 rcu_read_unlock();
2514
2515 return 0;
2516}
487cf67c 2517
8be98f9a
MD
2518/*
2519 * Start tracing for the UST session.
2520 */
2521int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2522{
2523 int ret = 0;
bec39940 2524 struct lttng_ht_iter iter;
8be98f9a
MD
2525 struct ust_app *app;
2526
2527 DBG("Stopping all UST traces");
2528
2529 rcu_read_lock();
2530
852d0037 2531 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2532 ret = ust_app_stop_trace(usess, app);
2533 if (ret < 0) {
2534 /* Continue to next apps even on error */
2535 continue;
2536 }
2537 }
2538
2539 rcu_read_unlock();
2540
2541 return 0;
2542}
2543
84cd17c6
MD
2544/*
2545 * Destroy app UST session.
2546 */
2547int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2548{
2549 int ret = 0;
bec39940 2550 struct lttng_ht_iter iter;
84cd17c6
MD
2551 struct ust_app *app;
2552
2553 DBG("Destroy all UST traces");
2554
2555 rcu_read_lock();
2556
852d0037 2557 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 2558 ret = destroy_trace(usess, app);
84cd17c6
MD
2559 if (ret < 0) {
2560 /* Continue to next apps even on error */
2561 continue;
2562 }
2563 }
2564
2565 rcu_read_unlock();
2566
2567 return 0;
2568}
2569
5b4a0ec0
DG
2570/*
2571 * Add channels/events from UST global domain to registered apps at sock.
2572 */
487cf67c
DG
2573void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2574{
55c54cce 2575 int ret = 0;
727d5404 2576 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2577 struct ust_app *app;
2578 struct ust_app_session *ua_sess;
2579 struct ust_app_channel *ua_chan;
2580 struct ust_app_event *ua_event;
727d5404 2581 struct ust_app_ctx *ua_ctx;
1f3580c7 2582
95e047ff 2583 assert(usess);
1f3580c7 2584
a991f516
MD
2585 DBG2("UST app global update for app sock %d for session id %d", sock,
2586 usess->id);
487cf67c 2587
284d8f55
DG
2588 rcu_read_lock();
2589
487cf67c
DG
2590 app = find_app_by_sock(sock);
2591 if (app == NULL) {
2592 ERR("Failed to update app sock %d", sock);
2593 goto error;
2594 }
2595
e0c7ec2b
DG
2596 if (!app->compatible) {
2597 goto error;
2598 }
2599
421cb601 2600 ua_sess = create_ust_app_session(usess, app);
5b98a774
DG
2601 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2602 /* Tracer is gone for this session and has been freed */
487cf67c
DG
2603 goto error;
2604 }
2605
284d8f55
DG
2606 /*
2607 * We can iterate safely here over all UST app session sicne the create ust
2608 * app session above made a shadow copy of the UST global domain from the
2609 * ltt ust session.
2610 */
bec39940
DG
2611 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2612 node.node) {
284d8f55
DG
2613 ret = create_ust_channel(app, ua_sess, ua_chan);
2614 if (ret < 0) {
2615 /* FIXME: Should we quit here or continue... */
2616 continue;
487cf67c
DG
2617 }
2618
727d5404
DG
2619 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2620 node.node) {
2621 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2622 if (ret < 0) {
2623 /* FIXME: Should we quit here or continue... */
2624 continue;
2625 }
2626 }
2627
2628
284d8f55 2629 /* For each events */
bec39940
DG
2630 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2631 node.node) {
284d8f55
DG
2632 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2633 if (ret < 0) {
2634 /* FIXME: Should we quit here or continue... */
2635 continue;
487cf67c 2636 }
727d5404 2637
53a80697
MD
2638 ret = set_ust_event_filter(ua_event, app);
2639 if (ret < 0) {
2640 /* FIXME: Should we quit here or continue... */
2641 continue;
2642 }
36dc12cc 2643 }
487cf67c
DG
2644 }
2645
36dc12cc 2646 if (usess->start_trace) {
421cb601 2647 ret = ust_app_start_trace(usess, app);
36dc12cc 2648 if (ret < 0) {
36dc12cc
DG
2649 goto error;
2650 }
2651
852d0037 2652 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2653 }
2654
487cf67c
DG
2655error:
2656 rcu_read_unlock();
2657 return;
2658}
55cc08a6
DG
2659
2660/*
2661 * Add context to a specific channel for global UST domain.
2662 */
2663int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2664 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2665{
2666 int ret = 0;
bec39940
DG
2667 struct lttng_ht_node_str *ua_chan_node;
2668 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2669 struct ust_app_channel *ua_chan = NULL;
2670 struct ust_app_session *ua_sess;
2671 struct ust_app *app;
2672
2673 rcu_read_lock();
2674
852d0037 2675 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2676 if (!app->compatible) {
2677 /*
2678 * TODO: In time, we should notice the caller of this error by
2679 * telling him that this is a version error.
2680 */
2681 continue;
2682 }
55cc08a6
DG
2683 ua_sess = lookup_session_by_app(usess, app);
2684 if (ua_sess == NULL) {
2685 continue;
2686 }
2687
2688 /* Lookup channel in the ust app session */
bec39940
DG
2689 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2690 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2691 if (ua_chan_node == NULL) {
2692 continue;
2693 }
2694 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2695 node);
2696
2697 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2698 if (ret < 0) {
2699 continue;
2700 }
2701 }
2702
55cc08a6
DG
2703 rcu_read_unlock();
2704 return ret;
2705}
2706
76d45b40
DG
2707/*
2708 * Enable event for a channel from a UST session for a specific PID.
2709 */
2710int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2711 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2712{
2713 int ret = 0;
bec39940 2714 struct lttng_ht_iter iter;
18eace3b 2715 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
2716 struct ust_app *app;
2717 struct ust_app_session *ua_sess;
2718 struct ust_app_channel *ua_chan;
2719 struct ust_app_event *ua_event;
2720
2721 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2722
2723 rcu_read_lock();
2724
2725 app = ust_app_find_by_pid(pid);
2726 if (app == NULL) {
2727 ERR("UST app enable event per PID %d not found", pid);
2728 ret = -1;
2729 goto error;
2730 }
2731
e0c7ec2b
DG
2732 if (!app->compatible) {
2733 ret = 0;
2734 goto error;
2735 }
2736
76d45b40 2737 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2738 if (!ua_sess) {
2739 /* The application has problem or is probably dead. */
2740 goto error;
2741 }
76d45b40
DG
2742
2743 /* Lookup channel in the ust app session */
bec39940
DG
2744 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2745 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2746 /* If the channel is not found, there is a code flow error */
2747 assert(ua_chan_node);
2748
2749 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2750
18eace3b
DG
2751 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2752 uevent->filter, uevent->attr.loglevel);
2753 if (ua_event == NULL) {
76d45b40
DG
2754 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2755 if (ret < 0) {
2756 goto error;
2757 }
2758 } else {
76d45b40
DG
2759 ret = enable_ust_app_event(ua_sess, ua_event, app);
2760 if (ret < 0) {
2761 goto error;
2762 }
2763 }
2764
2765error:
2766 rcu_read_unlock();
2767 return ret;
2768}
7f79d3a1
DG
2769
2770/*
2771 * Disable event for a channel from a UST session for a specific PID.
2772 */
2773int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2774 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2775{
2776 int ret = 0;
bec39940
DG
2777 struct lttng_ht_iter iter;
2778 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2779 struct ust_app *app;
2780 struct ust_app_session *ua_sess;
2781 struct ust_app_channel *ua_chan;
2782 struct ust_app_event *ua_event;
2783
2784 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2785
2786 rcu_read_lock();
2787
2788 app = ust_app_find_by_pid(pid);
2789 if (app == NULL) {
2790 ERR("UST app disable event per PID %d not found", pid);
2791 ret = -1;
2792 goto error;
2793 }
2794
e0c7ec2b
DG
2795 if (!app->compatible) {
2796 ret = 0;
2797 goto error;
2798 }
2799
7f79d3a1 2800 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2801 if (!ua_sess) {
2802 /* The application has problem or is probably dead. */
2803 goto error;
2804 }
7f79d3a1
DG
2805
2806 /* Lookup channel in the ust app session */
bec39940
DG
2807 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2808 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2809 if (ua_chan_node == NULL) {
2810 /* Channel does not exist, skip disabling */
2811 goto error;
2812 }
2813 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2814
bec39940
DG
2815 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2816 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2817 if (ua_event_node == NULL) {
2818 /* Event does not exist, skip disabling */
2819 goto error;
2820 }
2821 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2822
2823 ret = disable_ust_app_event(ua_sess, ua_event, app);
2824 if (ret < 0) {
2825 goto error;
2826 }
2827
2828error:
2829 rcu_read_unlock();
2830 return ret;
2831}
e0c7ec2b
DG
2832
2833/*
2834 * Validate version of UST apps and set the compatible bit.
2835 */
2836int ust_app_validate_version(int sock)
2837{
2838 int ret;
2839 struct ust_app *app;
2840
2841 rcu_read_lock();
2842
2843 app = find_app_by_sock(sock);
2844 assert(app);
2845
86acf0da
DG
2846 health_code_update(&health_thread_cmd);
2847
e0c7ec2b
DG
2848 ret = ustctl_tracer_version(sock, &app->version);
2849 if (ret < 0) {
2850 goto error;
2851 }
2852
2853 /* Validate version */
aee0cea0 2854 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2855 goto error;
2856 }
2857
68264071 2858 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2859 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2860 UST_APP_MAJOR_VERSION);
2861 app->compatible = 1;
2862 rcu_read_unlock();
86acf0da 2863 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2864 return 0;
2865
2866error:
68264071 2867 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2868 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2869 UST_APP_MAJOR_VERSION);
2870 app->compatible = 0;
2871 rcu_read_unlock();
86acf0da 2872 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2873 return -1;
2874}
4466912f
DG
2875
2876/*
2877 * Calibrate registered applications.
2878 */
2879int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2880{
2881 int ret = 0;
2882 struct lttng_ht_iter iter;
2883 struct ust_app *app;
2884
2885 rcu_read_lock();
2886
852d0037 2887 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2888 if (!app->compatible) {
2889 /*
2890 * TODO: In time, we should notice the caller of this error by
2891 * telling him that this is a version error.
2892 */
2893 continue;
2894 }
2895
86acf0da
DG
2896 health_code_update(&health_thread_cmd);
2897
852d0037 2898 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2899 if (ret < 0) {
2900 switch (ret) {
2901 case -ENOSYS:
2902 /* Means that it's not implemented on the tracer side. */
2903 ret = 0;
2904 break;
2905 default:
2906 /* TODO: Report error to user */
2907 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2908 app->pid, ret);
4466912f
DG
2909 break;
2910 }
2911 }
2912 }
2913
2914 DBG("UST app global domain calibration finished");
2915
2916 rcu_read_unlock();
2917
86acf0da
DG
2918 health_code_update(&health_thread_cmd);
2919
4466912f
DG
2920 return ret;
2921}
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