Fix: remove duplicate set ust event filter
[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c
CommitLineData
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <errno.h>
20#include <pthread.h>
21#include <stdio.h>
22#include <stdlib.h>
099e26bd 23#include <string.h>
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24#include <sys/stat.h>
25#include <sys/types.h>
099e26bd 26#include <unistd.h>
0df502fd 27#include <urcu/compiler.h>
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;
18eace3b
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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/*
284d8f55
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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
DG
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
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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
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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
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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
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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
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609 health_code_update(&health_thread_cmd);
610
852d0037 611 ret = ustctl_disable(app->sock, ua_chan->obj);
78f0bacd
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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{
421cb601
DG
1041 struct ust_app_session *ua_sess;
1042
86acf0da
DG
1043 health_code_update(&health_thread_cmd);
1044
421cb601
DG
1045 ua_sess = lookup_session_by_app(usess, app);
1046 if (ua_sess == NULL) {
a991f516 1047 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 1048 app->pid, usess->id);
421cb601
DG
1049 ua_sess = alloc_ust_app_session();
1050 if (ua_sess == NULL) {
1051 /* Only malloc can failed so something is really wrong */
fc34caaa 1052 goto end;
421cb601 1053 }
477d7741 1054 shadow_copy_session(ua_sess, usess, app);
421cb601
DG
1055 }
1056
86acf0da
DG
1057 health_code_update(&health_thread_cmd);
1058
421cb601 1059 if (ua_sess->handle == -1) {
c617c0c6
MD
1060 int ret;
1061
852d0037 1062 ret = ustctl_create_session(app->sock);
421cb601 1063 if (ret < 0) {
852d0037 1064 ERR("Creating session for app pid %d", app->pid);
0f83395d 1065 delete_ust_app_session(-1, ua_sess);
915d047c
DG
1066 /* This means that the tracer is gone... */
1067 ua_sess = (void*) -1UL;
0f83395d 1068 goto end;
421cb601
DG
1069 }
1070
421cb601
DG
1071 ua_sess->handle = ret;
1072
1073 /* Add ust app session to app's HT */
2c348c10 1074 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 1075 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
1076
1077 DBG2("UST app session created successfully with handle %d", ret);
1078 }
1079
fc34caaa 1080end:
86acf0da 1081 health_code_update(&health_thread_cmd);
421cb601 1082 return ua_sess;
421cb601
DG
1083}
1084
55cc08a6
DG
1085/*
1086 * Create a context for the channel on the tracer.
1087 */
1088static
1089int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1090 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1091 struct ust_app *app)
1092{
1093 int ret = 0;
bec39940
DG
1094 struct lttng_ht_iter iter;
1095 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1096 struct ust_app_ctx *ua_ctx;
1097
1098 DBG2("UST app adding context to channel %s", ua_chan->name);
1099
bec39940
DG
1100 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1101 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1102 if (node != NULL) {
1103 ret = -EEXIST;
1104 goto error;
1105 }
1106
1107 ua_ctx = alloc_ust_app_ctx(uctx);
1108 if (ua_ctx == NULL) {
1109 /* malloc failed */
1110 ret = -1;
1111 goto error;
1112 }
1113
bec39940
DG
1114 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1115 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1116
1117 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1118 if (ret < 0) {
1119 goto error;
1120 }
1121
1122error:
1123 return ret;
1124}
1125
edb67388
DG
1126/*
1127 * Enable on the tracer side a ust app event for the session and channel.
1128 */
1129static
1130int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1131 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1132{
1133 int ret;
1134
1135 ret = enable_ust_event(app, ua_sess, ua_event);
1136 if (ret < 0) {
1137 goto error;
1138 }
1139
1140 ua_event->enabled = 1;
1141
1142error:
1143 return ret;
1144}
1145
9730260e
DG
1146/*
1147 * Disable on the tracer side a ust app event for the session and channel.
1148 */
1149static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1150 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1151{
1152 int ret;
1153
1154 ret = disable_ust_event(app, ua_sess, ua_event);
1155 if (ret < 0) {
1156 goto error;
1157 }
1158
1159 ua_event->enabled = 0;
1160
1161error:
1162 return ret;
1163}
1164
78f0bacd
DG
1165/*
1166 * Lookup ust app channel for session and disable it on the tracer side.
1167 */
8535a6d9
DG
1168static
1169int disable_ust_app_channel(struct ust_app_session *ua_sess,
1170 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1171{
8535a6d9 1172 int ret;
78f0bacd
DG
1173
1174 ret = disable_ust_channel(app, ua_sess, ua_chan);
1175 if (ret < 0) {
1176 goto error;
1177 }
1178
8535a6d9
DG
1179 ua_chan->enabled = 0;
1180
78f0bacd
DG
1181error:
1182 return ret;
1183}
1184
1185/*
1186 * Lookup ust app channel for session and enable it on the tracer side.
1187 */
1188static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1189 struct ltt_ust_channel *uchan, struct ust_app *app)
1190{
1191 int ret = 0;
bec39940
DG
1192 struct lttng_ht_iter iter;
1193 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1194 struct ust_app_channel *ua_chan;
1195
bec39940
DG
1196 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1197 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1198 if (ua_chan_node == NULL) {
a991f516
MD
1199 DBG2("Unable to find channel %s in ust session id %u",
1200 uchan->name, ua_sess->id);
78f0bacd
DG
1201 goto error;
1202 }
1203
1204 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1205
1206 ret = enable_ust_channel(app, ua_sess, ua_chan);
1207 if (ret < 0) {
1208 goto error;
1209 }
1210
1211error:
1212 return ret;
1213}
1214
284d8f55 1215/*
4d710ac2
DG
1216 * Create UST app channel and create it on the tracer. Set ua_chanp of the
1217 * newly created channel if not NULL.
284d8f55 1218 */
4d710ac2
DG
1219static int create_ust_app_channel(struct ust_app_session *ua_sess,
1220 struct ltt_ust_channel *uchan, struct ust_app *app,
1221 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
1222{
1223 int ret = 0;
bec39940
DG
1224 struct lttng_ht_iter iter;
1225 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1226 struct ust_app_channel *ua_chan;
1227
1228 /* Lookup channel in the ust app session */
bec39940
DG
1229 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1230 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1231 if (ua_chan_node != NULL) {
5b4a0ec0 1232 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1233 goto end;
5b4a0ec0
DG
1234 }
1235
fc34caaa
DG
1236 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1237 if (ua_chan == NULL) {
1238 /* Only malloc can fail here */
4d710ac2 1239 ret = -ENOMEM;
fc34caaa
DG
1240 goto error;
1241 }
1242 shadow_copy_channel(ua_chan, uchan);
1243
5b4a0ec0
DG
1244 ret = create_ust_channel(app, ua_sess, ua_chan);
1245 if (ret < 0) {
fc34caaa 1246 /* Not found previously means that it does not exist on the tracer */
49c336c1 1247 assert(ret != -LTTNG_UST_ERR_EXIST);
5b4a0ec0
DG
1248 goto error;
1249 }
1250
4d710ac2 1251 /* Only add the channel if successful on the tracer side. */
58f3ca76
DG
1252 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1253
fc34caaa 1254 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1255 app->pid);
fc34caaa
DG
1256
1257end:
4d710ac2
DG
1258 if (ua_chanp) {
1259 *ua_chanp = ua_chan;
1260 }
1261
1262 /* Everything went well. */
1263 return 0;
5b4a0ec0
DG
1264
1265error:
fc34caaa 1266 delete_ust_app_channel(-1, ua_chan);
4d710ac2 1267 return ret;
5b4a0ec0
DG
1268}
1269
1270/*
1271 * Create UST app event and create it on the tracer side.
1272 */
edb67388
DG
1273static
1274int create_ust_app_event(struct ust_app_session *ua_sess,
1275 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1276 struct ust_app *app)
284d8f55 1277{
edb67388 1278 int ret = 0;
5b4a0ec0 1279 struct ust_app_event *ua_event;
284d8f55 1280
5b4a0ec0 1281 /* Get event node */
18eace3b
DG
1282 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1283 uevent->filter, uevent->attr.loglevel);
1284 if (ua_event != NULL) {
fc34caaa 1285 ret = -EEXIST;
edb67388
DG
1286 goto end;
1287 }
5b4a0ec0 1288
edb67388
DG
1289 /* Does not exist so create one */
1290 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1291 if (ua_event == NULL) {
1292 /* Only malloc can failed so something is really wrong */
1293 ret = -ENOMEM;
fc34caaa 1294 goto end;
5b4a0ec0 1295 }
edb67388 1296 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1297
edb67388 1298 /* Create it on the tracer side */
5b4a0ec0 1299 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1300 if (ret < 0) {
fc34caaa 1301 /* Not found previously means that it does not exist on the tracer */
76f66f63 1302 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
1303 goto error;
1304 }
1305
18eace3b 1306 add_unique_ust_app_event(ua_chan->events, ua_event);
284d8f55 1307
fc34caaa 1308 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1309 app->pid);
7f79d3a1 1310
edb67388 1311end:
fc34caaa
DG
1312 return ret;
1313
5b4a0ec0 1314error:
fc34caaa
DG
1315 /* Valid. Calling here is already in a read side lock */
1316 delete_ust_app_event(-1, ua_event);
edb67388 1317 return ret;
5b4a0ec0
DG
1318}
1319
1320/*
1321 * Create UST metadata and open it on the tracer side.
1322 */
1323static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1324 char *pathname, struct ust_app *app)
1325{
1326 int ret = 0;
1327
1328 if (ua_sess->metadata == NULL) {
1329 /* Allocate UST metadata */
1330 ua_sess->metadata = trace_ust_create_metadata(pathname);
1331 if (ua_sess->metadata == NULL) {
fc34caaa 1332 /* malloc() failed */
5b4a0ec0
DG
1333 goto error;
1334 }
1335
1336 ret = open_ust_metadata(app, ua_sess);
1337 if (ret < 0) {
7db205b5
DG
1338 DBG3("Opening metadata failed. Cleaning up memory");
1339
fc34caaa
DG
1340 /* Cleanup failed metadata struct */
1341 free(ua_sess->metadata);
7db205b5
DG
1342 /*
1343 * This is very important because delete_ust_app_session check if
1344 * the pointer is null or not in order to delete the metadata.
1345 */
1346 ua_sess->metadata = NULL;
5b4a0ec0
DG
1347 goto error;
1348 }
1349
852d0037 1350 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1351 }
1352
1353 /* Open UST metadata stream */
1354 if (ua_sess->metadata->stream_obj == NULL) {
1355 ret = create_ust_stream(app, ua_sess);
1356 if (ret < 0) {
1357 goto error;
1358 }
1359
477d7741
MD
1360 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1361 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1362 if (ret < 0) {
1363 PERROR("asprintf UST create stream");
1364 goto error;
1365 }
1366
1367 DBG2("UST metadata stream object created for app pid %d",
852d0037 1368 app->pid);
5b4a0ec0
DG
1369 } else {
1370 ERR("Attempting to create stream without metadata opened");
1371 goto error;
1372 }
1373
1374 return 0;
1375
1376error:
1377 return -1;
1378}
1379
1380/*
1381 * Return pointer to traceable apps list.
1382 */
bec39940 1383struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1384{
1385 return ust_app_ht;
1386}
1387
1388/*
1389 * Return ust app pointer or NULL if not found.
1390 */
1391struct ust_app *ust_app_find_by_pid(pid_t pid)
1392{
bec39940
DG
1393 struct lttng_ht_node_ulong *node;
1394 struct lttng_ht_iter iter;
5b4a0ec0
DG
1395
1396 rcu_read_lock();
bec39940
DG
1397 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1398 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1399 if (node == NULL) {
1400 DBG2("UST app no found with pid %d", pid);
1401 goto error;
1402 }
1403 rcu_read_unlock();
1404
1405 DBG2("Found UST app by pid %d", pid);
1406
852d0037 1407 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1408
1409error:
1410 rcu_read_unlock();
1411 return NULL;
1412}
1413
1414/*
1415 * Using pid and uid (of the app), allocate a new ust_app struct and
1416 * add it to the global traceable app list.
1417 *
0df502fd
MD
1418 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1419 * bitness is not supported.
5b4a0ec0
DG
1420 */
1421int ust_app_register(struct ust_register_msg *msg, int sock)
1422{
1423 struct ust_app *lta;
799e2c4f 1424 int ret;
5b4a0ec0 1425
173af62f
DG
1426 if ((msg->bits_per_long == 64 &&
1427 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1428 || (msg->bits_per_long == 32 &&
1429 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1430 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1431 "%d-bit long, but no consumerd for this long size is available.\n",
1432 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1433 ret = close(sock);
1434 if (ret) {
1435 PERROR("close");
1436 }
4063050c 1437 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1438 return -EINVAL;
1439 }
3f2c5fcc
MD
1440 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1441 ERR("Registration failed: application \"%s\" (pid: %d) has "
1442 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1443 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1444 ret = close(sock);
1445 if (ret) {
1446 PERROR("close");
1447 }
4063050c 1448 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1449 return -EINVAL;
1450 }
5b4a0ec0
DG
1451 lta = zmalloc(sizeof(struct ust_app));
1452 if (lta == NULL) {
1453 PERROR("malloc");
1454 return -ENOMEM;
1455 }
1456
1457 lta->ppid = msg->ppid;
1458 lta->uid = msg->uid;
1459 lta->gid = msg->gid;
e0c7ec2b 1460 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1461 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1462 lta->v_major = msg->major;
1463 lta->v_minor = msg->minor;
1464 strncpy(lta->name, msg->name, sizeof(lta->name));
1465 lta->name[16] = '\0';
bec39940 1466 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1467
852d0037
DG
1468 lta->pid = msg->pid;
1469 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1470 lta->sock = sock;
1471 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0 1472
d42f20df
DG
1473 CDS_INIT_LIST_HEAD(&lta->teardown_head);
1474
5b4a0ec0 1475 rcu_read_lock();
852d0037
DG
1476
1477 /*
1478 * On a re-registration, we want to kick out the previous registration of
1479 * that pid
1480 */
1481 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1482
1483 /*
1484 * The socket _should_ be unique until _we_ call close. So, a add_unique
1485 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1486 * already in the table.
1487 */
1488 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1489
5b4a0ec0
DG
1490 rcu_read_unlock();
1491
1492 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1493 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1494 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1495
1496 return 0;
1497}
1498
1499/*
1500 * Unregister app by removing it from the global traceable app list and freeing
1501 * the data struct.
1502 *
1503 * The socket is already closed at this point so no close to sock.
1504 */
1505void ust_app_unregister(int sock)
1506{
1507 struct ust_app *lta;
bec39940
DG
1508 struct lttng_ht_node_ulong *node;
1509 struct lttng_ht_iter iter;
d42f20df 1510 struct ust_app_session *ua_sess;
525b0740 1511 int ret;
5b4a0ec0
DG
1512
1513 rcu_read_lock();
886459c6 1514
5b4a0ec0 1515 /* Get the node reference for a call_rcu */
852d0037 1516 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1517 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1518 if (node == NULL) {
852d0037 1519 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1520 goto error;
1521 }
284d8f55 1522
852d0037
DG
1523 lta = caa_container_of(node, struct ust_app, sock_n);
1524
1525 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1526
886459c6 1527 /* Remove application from PID hash table */
852d0037
DG
1528 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1529 assert(!ret);
1530
1531 /* Assign second node for deletion */
1532 iter.iter.node = &lta->pid_n.node;
1533
5b98a774
DG
1534 /*
1535 * Ignore return value since the node might have been removed before by an
1536 * add replace during app registration because the PID can be reassigned by
1537 * the OS.
1538 */
bec39940 1539 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
1540 if (ret) {
1541 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1542 lta->pid);
1543 }
852d0037 1544
d42f20df
DG
1545 /* Remove sessions so they are not visible during deletion.*/
1546 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
1547 node.node) {
1548 ret = lttng_ht_del(lta->sessions, &iter);
1549 if (ret) {
1550 /* The session was already removed so scheduled for teardown. */
1551 continue;
1552 }
1553
1554 /*
1555 * Add session to list for teardown. This is safe since at this point we
1556 * are the only one using this list.
1557 */
1558 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
1559 }
1560
852d0037
DG
1561 /* Free memory */
1562 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1563
284d8f55 1564error:
5b4a0ec0
DG
1565 rcu_read_unlock();
1566 return;
284d8f55
DG
1567}
1568
1569/*
5b4a0ec0 1570 * Return traceable_app_count
284d8f55 1571 */
5b4a0ec0 1572unsigned long ust_app_list_count(void)
284d8f55 1573{
5b4a0ec0 1574 unsigned long count;
284d8f55 1575
5b4a0ec0 1576 rcu_read_lock();
bec39940 1577 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1578 rcu_read_unlock();
284d8f55 1579
5b4a0ec0 1580 return count;
284d8f55
DG
1581}
1582
5b4a0ec0
DG
1583/*
1584 * Fill events array with all events name of all registered apps.
1585 */
1586int ust_app_list_events(struct lttng_event **events)
421cb601 1587{
5b4a0ec0
DG
1588 int ret, handle;
1589 size_t nbmem, count = 0;
bec39940 1590 struct lttng_ht_iter iter;
5b4a0ec0 1591 struct ust_app *app;
c617c0c6 1592 struct lttng_event *tmp_event;
421cb601 1593
5b4a0ec0 1594 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
1595 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
1596 if (tmp_event == NULL) {
5b4a0ec0
DG
1597 PERROR("zmalloc ust app events");
1598 ret = -ENOMEM;
421cb601
DG
1599 goto error;
1600 }
1601
5b4a0ec0 1602 rcu_read_lock();
421cb601 1603
852d0037 1604 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1605 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1606
86acf0da
DG
1607 health_code_update(&health_thread_cmd);
1608
e0c7ec2b
DG
1609 if (!app->compatible) {
1610 /*
1611 * TODO: In time, we should notice the caller of this error by
1612 * telling him that this is a version error.
1613 */
1614 continue;
1615 }
852d0037 1616 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1617 if (handle < 0) {
1618 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1619 app->pid);
5b4a0ec0
DG
1620 continue;
1621 }
421cb601 1622
852d0037 1623 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 1624 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1625 health_code_update(&health_thread_cmd);
815564d8 1626 if (count >= nbmem) {
d7b3776f 1627 /* In case the realloc fails, we free the memory */
c617c0c6
MD
1628 void *ptr;
1629
815564d8
MD
1630 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1631 2 * nbmem);
1632 nbmem *= 2;
c617c0c6
MD
1633 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
1634 if (ptr == NULL) {
5b4a0ec0 1635 PERROR("realloc ust app events");
c617c0c6 1636 free(tmp_event);
5b4a0ec0
DG
1637 ret = -ENOMEM;
1638 goto rcu_error;
1639 }
c617c0c6 1640 tmp_event = ptr;
5b4a0ec0 1641 }
c617c0c6
MD
1642 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1643 tmp_event[count].loglevel = uiter.loglevel;
1644 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1645 tmp_event[count].pid = app->pid;
1646 tmp_event[count].enabled = -1;
5b4a0ec0 1647 count++;
421cb601 1648 }
421cb601
DG
1649 }
1650
5b4a0ec0 1651 ret = count;
c617c0c6 1652 *events = tmp_event;
421cb601 1653
5b4a0ec0 1654 DBG2("UST app list events done (%zu events)", count);
421cb601 1655
5b4a0ec0
DG
1656rcu_error:
1657 rcu_read_unlock();
421cb601 1658error:
86acf0da 1659 health_code_update(&health_thread_cmd);
5b4a0ec0 1660 return ret;
421cb601
DG
1661}
1662
f37d259d
MD
1663/*
1664 * Fill events array with all events name of all registered apps.
1665 */
1666int ust_app_list_event_fields(struct lttng_event_field **fields)
1667{
1668 int ret, handle;
1669 size_t nbmem, count = 0;
1670 struct lttng_ht_iter iter;
1671 struct ust_app *app;
c617c0c6 1672 struct lttng_event_field *tmp_event;
f37d259d
MD
1673
1674 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
1675 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
1676 if (tmp_event == NULL) {
f37d259d
MD
1677 PERROR("zmalloc ust app event fields");
1678 ret = -ENOMEM;
1679 goto error;
1680 }
1681
1682 rcu_read_lock();
1683
1684 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1685 struct lttng_ust_field_iter uiter;
1686
86acf0da
DG
1687 health_code_update(&health_thread_cmd);
1688
f37d259d
MD
1689 if (!app->compatible) {
1690 /*
1691 * TODO: In time, we should notice the caller of this error by
1692 * telling him that this is a version error.
1693 */
1694 continue;
1695 }
1696 handle = ustctl_tracepoint_field_list(app->sock);
1697 if (handle < 0) {
1698 ERR("UST app list event fields getting handle failed for app pid %d",
1699 app->pid);
1700 continue;
1701 }
1702
1703 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 1704 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1705 health_code_update(&health_thread_cmd);
f37d259d 1706 if (count >= nbmem) {
d7b3776f 1707 /* In case the realloc fails, we free the memory */
c617c0c6
MD
1708 void *ptr;
1709
f37d259d
MD
1710 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1711 2 * nbmem);
1712 nbmem *= 2;
c617c0c6
MD
1713 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
1714 if (ptr == NULL) {
f37d259d 1715 PERROR("realloc ust app event fields");
c617c0c6 1716 free(tmp_event);
f37d259d
MD
1717 ret = -ENOMEM;
1718 goto rcu_error;
1719 }
c617c0c6 1720 tmp_event = ptr;
f37d259d 1721 }
f37d259d 1722
c617c0c6
MD
1723 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1724 tmp_event[count].type = uiter.type;
1725 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 1726
c617c0c6
MD
1727 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1728 tmp_event[count].event.loglevel = uiter.loglevel;
1729 tmp_event[count].event.type = LTTNG_UST_TRACEPOINT;
1730 tmp_event[count].event.pid = app->pid;
1731 tmp_event[count].event.enabled = -1;
f37d259d
MD
1732 count++;
1733 }
1734 }
1735
1736 ret = count;
c617c0c6 1737 *fields = tmp_event;
f37d259d
MD
1738
1739 DBG2("UST app list event fields done (%zu events)", count);
1740
1741rcu_error:
1742 rcu_read_unlock();
1743error:
86acf0da 1744 health_code_update(&health_thread_cmd);
f37d259d
MD
1745 return ret;
1746}
1747
5b4a0ec0
DG
1748/*
1749 * Free and clean all traceable apps of the global list.
1750 */
1751void ust_app_clean_list(void)
421cb601 1752{
5b4a0ec0 1753 int ret;
659ed79f 1754 struct ust_app *app;
bec39940 1755 struct lttng_ht_iter iter;
421cb601 1756
5b4a0ec0 1757 DBG2("UST app cleaning registered apps hash table");
421cb601 1758
5b4a0ec0 1759 rcu_read_lock();
421cb601 1760
659ed79f 1761 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1762 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1763 assert(!ret);
659ed79f 1764 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1765 }
1766
852d0037 1767 /* Cleanup socket hash table */
659ed79f
DG
1768 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1769 sock_n.node) {
852d0037 1770 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1771 assert(!ret);
1772 }
852d0037 1773
bec39940 1774 /* Destroy is done only when the ht is empty */
852d0037
DG
1775 lttng_ht_destroy(ust_app_ht);
1776 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1777
5b4a0ec0
DG
1778 rcu_read_unlock();
1779}
1780
1781/*
1782 * Init UST app hash table.
1783 */
1784void ust_app_ht_alloc(void)
1785{
bec39940 1786 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1787 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1788}
1789
78f0bacd
DG
1790/*
1791 * For a specific UST session, disable the channel for all registered apps.
1792 */
35a9059d 1793int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1794 struct ltt_ust_channel *uchan)
1795{
1796 int ret = 0;
bec39940
DG
1797 struct lttng_ht_iter iter;
1798 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1799 struct ust_app *app;
1800 struct ust_app_session *ua_sess;
8535a6d9 1801 struct ust_app_channel *ua_chan;
78f0bacd
DG
1802
1803 if (usess == NULL || uchan == NULL) {
1804 ERR("Disabling UST global channel with NULL values");
1805 ret = -1;
1806 goto error;
1807 }
1808
a991f516
MD
1809 DBG2("UST app disabling channel %s from global domain for session id %d",
1810 uchan->name, usess->id);
78f0bacd
DG
1811
1812 rcu_read_lock();
1813
1814 /* For every registered applications */
852d0037 1815 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1816 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1817 if (!app->compatible) {
1818 /*
1819 * TODO: In time, we should notice the caller of this error by
1820 * telling him that this is a version error.
1821 */
1822 continue;
1823 }
78f0bacd
DG
1824 ua_sess = lookup_session_by_app(usess, app);
1825 if (ua_sess == NULL) {
1826 continue;
1827 }
1828
8535a6d9 1829 /* Get channel */
bec39940
DG
1830 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1831 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1832 /* If the session if found for the app, the channel must be there */
1833 assert(ua_chan_node);
1834
1835 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1836 /* The channel must not be already disabled */
1837 assert(ua_chan->enabled == 1);
1838
1839 /* Disable channel onto application */
1840 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1841 if (ret < 0) {
1842 /* XXX: We might want to report this error at some point... */
1843 continue;
1844 }
1845 }
1846
1847 rcu_read_unlock();
1848
1849error:
1850 return ret;
1851}
1852
1853/*
1854 * For a specific UST session, enable the channel for all registered apps.
1855 */
35a9059d 1856int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1857 struct ltt_ust_channel *uchan)
1858{
1859 int ret = 0;
bec39940 1860 struct lttng_ht_iter iter;
78f0bacd
DG
1861 struct ust_app *app;
1862 struct ust_app_session *ua_sess;
1863
1864 if (usess == NULL || uchan == NULL) {
1865 ERR("Adding UST global channel to NULL values");
1866 ret = -1;
1867 goto error;
1868 }
1869
a991f516
MD
1870 DBG2("UST app enabling channel %s to global domain for session id %d",
1871 uchan->name, usess->id);
78f0bacd
DG
1872
1873 rcu_read_lock();
1874
1875 /* For every registered applications */
852d0037 1876 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1877 if (!app->compatible) {
1878 /*
1879 * TODO: In time, we should notice the caller of this error by
1880 * telling him that this is a version error.
1881 */
1882 continue;
1883 }
78f0bacd
DG
1884 ua_sess = lookup_session_by_app(usess, app);
1885 if (ua_sess == NULL) {
1886 continue;
1887 }
1888
1889 /* Enable channel onto application */
1890 ret = enable_ust_app_channel(ua_sess, uchan, app);
1891 if (ret < 0) {
1892 /* XXX: We might want to report this error at some point... */
1893 continue;
1894 }
1895 }
1896
1897 rcu_read_unlock();
1898
1899error:
1900 return ret;
1901}
1902
b0a40d28
DG
1903/*
1904 * Disable an event in a channel and for a specific session.
1905 */
35a9059d
DG
1906int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1907 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1908{
1909 int ret = 0;
bec39940
DG
1910 struct lttng_ht_iter iter, uiter;
1911 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1912 struct ust_app *app;
1913 struct ust_app_session *ua_sess;
1914 struct ust_app_channel *ua_chan;
1915 struct ust_app_event *ua_event;
1916
1917 DBG("UST app disabling event %s for all apps in channel "
a991f516 1918 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1919
1920 rcu_read_lock();
1921
1922 /* For all registered applications */
852d0037 1923 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1924 if (!app->compatible) {
1925 /*
1926 * TODO: In time, we should notice the caller of this error by
1927 * telling him that this is a version error.
1928 */
1929 continue;
1930 }
b0a40d28
DG
1931 ua_sess = lookup_session_by_app(usess, app);
1932 if (ua_sess == NULL) {
1933 /* Next app */
1934 continue;
1935 }
1936
1937 /* Lookup channel in the ust app session */
bec39940
DG
1938 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1939 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1940 if (ua_chan_node == NULL) {
a991f516 1941 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1942 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1943 continue;
1944 }
1945 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1946
bec39940
DG
1947 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1948 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1949 if (ua_event_node == NULL) {
1950 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1951 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1952 continue;
1953 }
1954 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1955
7f79d3a1 1956 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1957 if (ret < 0) {
1958 /* XXX: Report error someday... */
1959 continue;
1960 }
1961 }
1962
1963 rcu_read_unlock();
1964
1965 return ret;
1966}
1967
9730260e 1968/*
edb67388 1969 * For a specific UST session and UST channel, the event for all
9730260e
DG
1970 * registered apps.
1971 */
35a9059d 1972int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1973 struct ltt_ust_channel *uchan)
1974{
1975 int ret = 0;
bec39940
DG
1976 struct lttng_ht_iter iter, uiter;
1977 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
1978 struct ust_app *app;
1979 struct ust_app_session *ua_sess;
1980 struct ust_app_channel *ua_chan;
1981 struct ust_app_event *ua_event;
1982
1983 DBG("UST app disabling all event for all apps in channel "
a991f516 1984 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
1985
1986 rcu_read_lock();
1987
1988 /* For all registered applications */
852d0037 1989 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1990 if (!app->compatible) {
1991 /*
1992 * TODO: In time, we should notice the caller of this error by
1993 * telling him that this is a version error.
1994 */
1995 continue;
1996 }
9730260e 1997 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
1998 if (!ua_sess) {
1999 /* The application has problem or is probably dead. */
2000 continue;
2001 }
9730260e
DG
2002
2003 /* Lookup channel in the ust app session */
bec39940
DG
2004 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2005 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2006 /* If the channel is not found, there is a code flow error */
2007 assert(ua_chan_node);
2008
9730260e
DG
2009 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2010
2011 /* Disable each events of channel */
bec39940
DG
2012 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2013 node.node) {
7f79d3a1 2014 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
2015 if (ret < 0) {
2016 /* XXX: Report error someday... */
2017 continue;
2018 }
2019 }
2020 }
2021
2022 rcu_read_unlock();
2023
2024 return ret;
2025}
2026
421cb601 2027/*
5b4a0ec0 2028 * For a specific UST session, create the channel for all registered apps.
421cb601 2029 */
35a9059d 2030int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
2031 struct ltt_ust_channel *uchan)
2032{
3c14c33f 2033 int ret = 0;
bec39940 2034 struct lttng_ht_iter iter;
48842b30
DG
2035 struct ust_app *app;
2036 struct ust_app_session *ua_sess;
48842b30 2037
fc34caaa
DG
2038 /* Very wrong code flow */
2039 assert(usess);
2040 assert(uchan);
421cb601 2041
a991f516
MD
2042 DBG2("UST app adding channel %s to global domain for session id %d",
2043 uchan->name, usess->id);
48842b30
DG
2044
2045 rcu_read_lock();
421cb601 2046
5b4a0ec0 2047 /* For every registered applications */
852d0037 2048 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2049 if (!app->compatible) {
2050 /*
2051 * TODO: In time, we should notice the caller of this error by
2052 * telling him that this is a version error.
2053 */
2054 continue;
2055 }
edb67388
DG
2056 /*
2057 * Create session on the tracer side and add it to app session HT. Note
2058 * that if session exist, it will simply return a pointer to the ust
2059 * app session.
2060 */
421cb601 2061 ua_sess = create_ust_app_session(usess, app);
509cbaf8 2062 if (ua_sess == NULL) {
915d047c 2063 /* The malloc() failed. */
4d710ac2 2064 ret = -ENOMEM;
95e047ff 2065 goto error_rcu_unlock;
915d047c 2066 } else if (ua_sess == (void *) -1UL) {
4d710ac2
DG
2067 /*
2068 * The application's socket is not valid. Either a bad socket or a
2069 * timeout on it. We can't inform yet the caller that for a
2070 * specific app, the session failed so we continue here.
2071 */
915d047c 2072 continue;
48842b30
DG
2073 }
2074
4d710ac2
DG
2075 /* Create channel onto application. We don't need the chan ref. */
2076 ret = create_ust_app_channel(ua_sess, uchan, app, NULL);
2077 if (ret < 0 && ret == -ENOMEM) {
2078 /* No more memory is a fatal error. Stop right now. */
95e047ff 2079 goto error_rcu_unlock;
48842b30 2080 }
48842b30 2081 }
5b4a0ec0 2082
95e047ff 2083error_rcu_unlock:
48842b30 2084 rcu_read_unlock();
3c14c33f 2085 return ret;
48842b30
DG
2086}
2087
5b4a0ec0 2088/*
edb67388 2089 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2090 */
35a9059d 2091int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2092 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2093{
2094 int ret = 0;
bec39940 2095 struct lttng_ht_iter iter, uiter;
18eace3b 2096 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
2097 struct ust_app *app;
2098 struct ust_app_session *ua_sess;
2099 struct ust_app_channel *ua_chan;
2100 struct ust_app_event *ua_event;
48842b30 2101
a991f516
MD
2102 DBG("UST app enabling event %s for all apps for session id %d",
2103 uevent->attr.name, usess->id);
48842b30 2104
edb67388
DG
2105 /*
2106 * NOTE: At this point, this function is called only if the session and
2107 * channel passed are already created for all apps. and enabled on the
2108 * tracer also.
2109 */
2110
48842b30 2111 rcu_read_lock();
421cb601
DG
2112
2113 /* For all registered applications */
852d0037 2114 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2115 if (!app->compatible) {
2116 /*
2117 * TODO: In time, we should notice the caller of this error by
2118 * telling him that this is a version error.
2119 */
2120 continue;
2121 }
edb67388 2122 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2123 if (!ua_sess) {
2124 /* The application has problem or is probably dead. */
2125 continue;
2126 }
ba767faf 2127
edb67388 2128 /* Lookup channel in the ust app session */
bec39940
DG
2129 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2130 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2131 /* If the channel is not found, there is a code flow error */
2132 assert(ua_chan_node);
2133
2134 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2135
18eace3b
DG
2136 /* Get event node */
2137 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2138 uevent->filter, uevent->attr.loglevel);
2139 if (ua_event == NULL) {
7f79d3a1 2140 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2141 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2142 continue;
2143 }
35a9059d
DG
2144
2145 ret = enable_ust_app_event(ua_sess, ua_event, app);
2146 if (ret < 0) {
7f79d3a1 2147 goto error;
48842b30 2148 }
edb67388
DG
2149 }
2150
7f79d3a1 2151error:
edb67388 2152 rcu_read_unlock();
edb67388
DG
2153 return ret;
2154}
2155
2156/*
2157 * For a specific existing UST session and UST channel, creates the event for
2158 * all registered apps.
2159 */
35a9059d 2160int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2161 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2162{
2163 int ret = 0;
bec39940
DG
2164 struct lttng_ht_iter iter, uiter;
2165 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2166 struct ust_app *app;
2167 struct ust_app_session *ua_sess;
2168 struct ust_app_channel *ua_chan;
2169
a991f516
MD
2170 DBG("UST app creating event %s for all apps for session id %d",
2171 uevent->attr.name, usess->id);
edb67388 2172
edb67388
DG
2173 rcu_read_lock();
2174
2175 /* For all registered applications */
852d0037 2176 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2177 if (!app->compatible) {
2178 /*
2179 * TODO: In time, we should notice the caller of this error by
2180 * telling him that this is a version error.
2181 */
2182 continue;
2183 }
edb67388 2184 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2185 if (!ua_sess) {
2186 /* The application has problem or is probably dead. */
2187 continue;
2188 }
48842b30
DG
2189
2190 /* Lookup channel in the ust app session */
bec39940
DG
2191 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2192 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2193 /* If the channel is not found, there is a code flow error */
2194 assert(ua_chan_node);
2195
48842b30
DG
2196 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2197
edb67388
DG
2198 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2199 if (ret < 0) {
49c336c1 2200 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
2201 /* Possible value at this point: -ENOMEM. If so, we stop! */
2202 break;
2203 }
2204 DBG2("UST app event %s already exist on app PID %d",
852d0037 2205 uevent->attr.name, app->pid);
5b4a0ec0 2206 continue;
48842b30 2207 }
48842b30 2208 }
5b4a0ec0 2209
48842b30
DG
2210 rcu_read_unlock();
2211
2212 return ret;
2213}
2214
5b4a0ec0
DG
2215/*
2216 * Start tracing for a specific UST session and app.
2217 */
421cb601 2218int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2219{
2220 int ret = 0;
bec39940 2221 struct lttng_ht_iter iter;
48842b30
DG
2222 struct ust_app_session *ua_sess;
2223 struct ust_app_channel *ua_chan;
5b4a0ec0 2224 struct ltt_ust_stream *ustream;
173af62f 2225 struct consumer_socket *socket;
48842b30 2226
852d0037 2227 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2228
509cbaf8
MD
2229 rcu_read_lock();
2230
e0c7ec2b
DG
2231 if (!app->compatible) {
2232 goto end;
2233 }
2234
421cb601
DG
2235 ua_sess = lookup_session_by_app(usess, app);
2236 if (ua_sess == NULL) {
d42f20df
DG
2237 /* The session is in teardown process. Ignore and continue. */
2238 goto end;
421cb601 2239 }
48842b30 2240
aea829b3
DG
2241 /* Upon restart, we skip the setup, already done */
2242 if (ua_sess->started) {
8be98f9a 2243 goto skip_setup;
aea829b3 2244 }
8be98f9a 2245
a4b92340
DG
2246 /* Create directories if consumer is LOCAL and has a path defined. */
2247 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2248 strlen(usess->consumer->dst.trace_path) > 0) {
2249 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2250 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2251 if (ret < 0) {
2252 if (ret != -EEXIST) {
2253 ERR("Trace directory creation error");
2254 ret = -1;
2255 goto error_rcu_unlock;
2256 }
2257 }
2258 }
2259
421cb601
DG
2260 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2261 if (ret < 0) {
f73fabfd 2262 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2263 goto error_rcu_unlock;
421cb601 2264 }
48842b30 2265
421cb601 2266 /* For each channel */
bec39940
DG
2267 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2268 node.node) {
421cb601
DG
2269 /* Create all streams */
2270 while (1) {
5b4a0ec0 2271 /* Create UST stream */
421cb601
DG
2272 ustream = zmalloc(sizeof(*ustream));
2273 if (ustream == NULL) {
2274 PERROR("zmalloc ust stream");
509cbaf8 2275 goto error_rcu_unlock;
421cb601 2276 }
48842b30 2277
4063050c
MD
2278 /* We are going to receive 2 fds, we need to reserve them. */
2279 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2280 if (ret < 0) {
2281 ERR("Exhausted number of available FD upon stream create");
2282 free(ustream);
2283 goto error_rcu_unlock;
2284 }
86acf0da
DG
2285
2286 health_code_update(&health_thread_cmd);
2287
852d0037 2288 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2289 &ustream->obj);
48842b30 2290 if (ret < 0) {
421cb601 2291 /* Got all streams */
4063050c 2292 lttng_fd_put(LTTNG_FD_APPS, 2);
a2c0da86 2293 free(ustream);
f73fabfd 2294 ret = LTTNG_ERR_UST_STREAM_FAIL;
421cb601 2295 break;
48842b30 2296 }
421cb601 2297 ustream->handle = ustream->obj->handle;
48842b30 2298
86acf0da
DG
2299 health_code_update(&health_thread_cmd);
2300
421cb601
DG
2301 /* Order is important */
2302 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2303 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2304 ua_chan->name, ua_chan->streams.count);
2305 ua_chan->streams.count++;
aba8e916
DG
2306 if (ret < 0) {
2307 PERROR("asprintf UST create stream");
a2c0da86
MD
2308 /*
2309 * XXX what should we do here with the
2310 * stream ?
2311 */
421cb601 2312 continue;
aba8e916 2313 }
00e2e675
DG
2314 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2315 ustream->handle);
421cb601 2316 }
86acf0da
DG
2317
2318 health_code_update(&health_thread_cmd);
421cb601 2319 }
aba8e916 2320
7753dea8
MD
2321 switch (app->bits_per_long) {
2322 case 64:
173af62f
DG
2323 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2324 usess->consumer);
2325 if (socket == NULL) {
2326 goto skip_setup;
2327 }
7753dea8
MD
2328 break;
2329 case 32:
173af62f
DG
2330 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2331 usess->consumer);
2332 if (socket == NULL) {
2333 goto skip_setup;
2334 }
7753dea8
MD
2335 break;
2336 default:
2337 ret = -EINVAL;
2338 goto error_rcu_unlock;
2339 }
aea829b3 2340
421cb601 2341 /* Setup UST consumer socket and send fds to it */
173af62f 2342 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2343 if (ret < 0) {
509cbaf8 2344 goto error_rcu_unlock;
421cb601 2345 }
48842b30 2346
86acf0da
DG
2347 health_code_update(&health_thread_cmd);
2348
8be98f9a 2349skip_setup:
421cb601 2350 /* This start the UST tracing */
852d0037 2351 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2352 if (ret < 0) {
5c3c99d7 2353 ERR("Error starting tracing for app pid: %d (ret: %d)", app->pid, ret);
509cbaf8 2354 goto error_rcu_unlock;
421cb601 2355 }
5b4a0ec0 2356
55c3953d
DG
2357 /* Indicate that the session has been started once */
2358 ua_sess->started = 1;
2359
86acf0da
DG
2360 health_code_update(&health_thread_cmd);
2361
421cb601 2362 /* Quiescent wait after starting trace */
852d0037 2363 ustctl_wait_quiescent(app->sock);
48842b30 2364
e0c7ec2b
DG
2365end:
2366 rcu_read_unlock();
86acf0da 2367 health_code_update(&health_thread_cmd);
421cb601 2368 return 0;
48842b30 2369
509cbaf8
MD
2370error_rcu_unlock:
2371 rcu_read_unlock();
86acf0da 2372 health_code_update(&health_thread_cmd);
421cb601
DG
2373 return -1;
2374}
48842b30 2375
8be98f9a
MD
2376/*
2377 * Stop tracing for a specific UST session and app.
2378 */
2379int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2380{
2381 int ret = 0;
bec39940 2382 struct lttng_ht_iter iter;
8be98f9a 2383 struct ust_app_session *ua_sess;
6d3686da 2384 struct ust_app_channel *ua_chan;
8be98f9a 2385
852d0037 2386 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2387
2388 rcu_read_lock();
2389
e0c7ec2b
DG
2390 if (!app->compatible) {
2391 goto end;
2392 }
2393
8be98f9a
MD
2394 ua_sess = lookup_session_by_app(usess, app);
2395 if (ua_sess == NULL) {
d42f20df 2396 goto end;
8be98f9a
MD
2397 }
2398
9bc07046
DG
2399 /*
2400 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
2401 * that was never started. It's possible since we can have a fail start
2402 * from either the application manager thread or the command thread. Simply
2403 * indicate that this is a stop error.
9bc07046 2404 */
f9dfc3d9 2405 if (!ua_sess->started) {
c45536e1
DG
2406 goto error_rcu_unlock;
2407 }
7db205b5 2408
86acf0da
DG
2409 health_code_update(&health_thread_cmd);
2410
9d6c7d3f 2411 /* This inhibits UST tracing */
852d0037 2412 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2413 if (ret < 0) {
5c3c99d7 2414 ERR("Error stopping tracing for app pid: %d (ret: %d)", app->pid, ret);
9d6c7d3f
DG
2415 goto error_rcu_unlock;
2416 }
2417
86acf0da
DG
2418 health_code_update(&health_thread_cmd);
2419
9d6c7d3f 2420 /* Quiescent wait after stopping trace */
852d0037 2421 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2422
86acf0da
DG
2423 health_code_update(&health_thread_cmd);
2424
9d6c7d3f 2425 /* Flushing buffers */
bec39940
DG
2426 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2427 node.node) {
86acf0da 2428 health_code_update(&health_thread_cmd);
852d0037 2429 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2430 if (ret < 0) {
7db205b5 2431 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2432 app->pid, ua_chan->name, ret);
6d3686da
DG
2433 /* Continuing flushing all buffers */
2434 continue;
8be98f9a
MD
2435 }
2436 }
8be98f9a 2437
86acf0da
DG
2438 health_code_update(&health_thread_cmd);
2439
90d97d10 2440 /* Flush all buffers before stopping */
852d0037 2441 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2442 if (ret < 0) {
852d0037 2443 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2444 ret);
90d97d10
DG
2445 }
2446
7db205b5
DG
2447end:
2448 rcu_read_unlock();
86acf0da 2449 health_code_update(&health_thread_cmd);
8be98f9a
MD
2450 return 0;
2451
2452error_rcu_unlock:
2453 rcu_read_unlock();
86acf0da 2454 health_code_update(&health_thread_cmd);
8be98f9a
MD
2455 return -1;
2456}
2457
84cd17c6
MD
2458/*
2459 * Destroy a specific UST session in apps.
2460 */
3353de95 2461static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6
MD
2462{
2463 struct ust_app_session *ua_sess;
2464 struct lttng_ust_object_data obj;
bec39940
DG
2465 struct lttng_ht_iter iter;
2466 struct lttng_ht_node_ulong *node;
525b0740 2467 int ret;
84cd17c6 2468
852d0037 2469 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2470
2471 rcu_read_lock();
2472
e0c7ec2b
DG
2473 if (!app->compatible) {
2474 goto end;
2475 }
2476
84cd17c6 2477 __lookup_session_by_app(usess, app, &iter);
bec39940 2478 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6 2479 if (node == NULL) {
d42f20df
DG
2480 /* Session is being or is deleted. */
2481 goto end;
84cd17c6
MD
2482 }
2483 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2484 ret = lttng_ht_del(app->sessions, &iter);
c4a1715b
DG
2485 if (ret) {
2486 /* Already scheduled for teardown. */
2487 goto end;
2488 }
2489
84cd17c6
MD
2490 obj.handle = ua_sess->handle;
2491 obj.shm_fd = -1;
2492 obj.wait_fd = -1;
2493 obj.memory_map_size = 0;
86acf0da 2494 health_code_update(&health_thread_cmd);
852d0037 2495 ustctl_release_object(app->sock, &obj);
84cd17c6 2496
86acf0da 2497 health_code_update(&health_thread_cmd);
852d0037 2498 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2499
84cd17c6 2500 /* Quiescent wait after stopping trace */
852d0037 2501 ustctl_wait_quiescent(app->sock);
84cd17c6 2502
e0c7ec2b
DG
2503end:
2504 rcu_read_unlock();
86acf0da 2505 health_code_update(&health_thread_cmd);
84cd17c6 2506 return 0;
84cd17c6
MD
2507}
2508
5b4a0ec0
DG
2509/*
2510 * Start tracing for the UST session.
2511 */
421cb601
DG
2512int ust_app_start_trace_all(struct ltt_ust_session *usess)
2513{
2514 int ret = 0;
bec39940 2515 struct lttng_ht_iter iter;
421cb601 2516 struct ust_app *app;
48842b30 2517
421cb601
DG
2518 DBG("Starting all UST traces");
2519
2520 rcu_read_lock();
421cb601 2521
852d0037 2522 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2523 ret = ust_app_start_trace(usess, app);
48842b30 2524 if (ret < 0) {
5b4a0ec0
DG
2525 /* Continue to next apps even on error */
2526 continue;
48842b30 2527 }
48842b30 2528 }
5b4a0ec0 2529
48842b30
DG
2530 rcu_read_unlock();
2531
2532 return 0;
2533}
487cf67c 2534
8be98f9a
MD
2535/*
2536 * Start tracing for the UST session.
2537 */
2538int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2539{
2540 int ret = 0;
bec39940 2541 struct lttng_ht_iter iter;
8be98f9a
MD
2542 struct ust_app *app;
2543
2544 DBG("Stopping all UST traces");
2545
2546 rcu_read_lock();
2547
852d0037 2548 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2549 ret = ust_app_stop_trace(usess, app);
2550 if (ret < 0) {
2551 /* Continue to next apps even on error */
2552 continue;
2553 }
2554 }
2555
2556 rcu_read_unlock();
2557
2558 return 0;
2559}
2560
84cd17c6
MD
2561/*
2562 * Destroy app UST session.
2563 */
2564int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2565{
2566 int ret = 0;
bec39940 2567 struct lttng_ht_iter iter;
84cd17c6
MD
2568 struct ust_app *app;
2569
2570 DBG("Destroy all UST traces");
2571
2572 rcu_read_lock();
2573
852d0037 2574 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 2575 ret = destroy_trace(usess, app);
84cd17c6
MD
2576 if (ret < 0) {
2577 /* Continue to next apps even on error */
2578 continue;
2579 }
2580 }
2581
2582 rcu_read_unlock();
2583
2584 return 0;
2585}
2586
5b4a0ec0
DG
2587/*
2588 * Add channels/events from UST global domain to registered apps at sock.
2589 */
487cf67c
DG
2590void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2591{
55c54cce 2592 int ret = 0;
727d5404 2593 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c
DG
2594 struct ust_app *app;
2595 struct ust_app_session *ua_sess;
2596 struct ust_app_channel *ua_chan;
2597 struct ust_app_event *ua_event;
727d5404 2598 struct ust_app_ctx *ua_ctx;
1f3580c7 2599
95e047ff 2600 assert(usess);
1f3580c7 2601
a991f516
MD
2602 DBG2("UST app global update for app sock %d for session id %d", sock,
2603 usess->id);
487cf67c 2604
284d8f55
DG
2605 rcu_read_lock();
2606
487cf67c
DG
2607 app = find_app_by_sock(sock);
2608 if (app == NULL) {
2609 ERR("Failed to update app sock %d", sock);
2610 goto error;
2611 }
2612
e0c7ec2b
DG
2613 if (!app->compatible) {
2614 goto error;
2615 }
2616
421cb601 2617 ua_sess = create_ust_app_session(usess, app);
5b98a774
DG
2618 if (ua_sess == NULL || ua_sess == (void *) -1UL) {
2619 /* Tracer is gone for this session and has been freed */
487cf67c
DG
2620 goto error;
2621 }
2622
284d8f55
DG
2623 /*
2624 * We can iterate safely here over all UST app session sicne the create ust
2625 * app session above made a shadow copy of the UST global domain from the
2626 * ltt ust session.
2627 */
bec39940
DG
2628 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2629 node.node) {
284d8f55
DG
2630 ret = create_ust_channel(app, ua_sess, ua_chan);
2631 if (ret < 0) {
2632 /* FIXME: Should we quit here or continue... */
2633 continue;
487cf67c
DG
2634 }
2635
727d5404
DG
2636 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2637 node.node) {
2638 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2639 if (ret < 0) {
2640 /* FIXME: Should we quit here or continue... */
2641 continue;
2642 }
2643 }
2644
2645
284d8f55 2646 /* For each events */
bec39940
DG
2647 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2648 node.node) {
284d8f55
DG
2649 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2650 if (ret < 0) {
2651 /* FIXME: Should we quit here or continue... */
2652 continue;
487cf67c 2653 }
36dc12cc 2654 }
487cf67c
DG
2655 }
2656
36dc12cc 2657 if (usess->start_trace) {
421cb601 2658 ret = ust_app_start_trace(usess, app);
36dc12cc 2659 if (ret < 0) {
36dc12cc
DG
2660 goto error;
2661 }
2662
852d0037 2663 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2664 }
2665
487cf67c
DG
2666error:
2667 rcu_read_unlock();
2668 return;
2669}
55cc08a6
DG
2670
2671/*
2672 * Add context to a specific channel for global UST domain.
2673 */
2674int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2675 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2676{
2677 int ret = 0;
bec39940
DG
2678 struct lttng_ht_node_str *ua_chan_node;
2679 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2680 struct ust_app_channel *ua_chan = NULL;
2681 struct ust_app_session *ua_sess;
2682 struct ust_app *app;
2683
2684 rcu_read_lock();
2685
852d0037 2686 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2687 if (!app->compatible) {
2688 /*
2689 * TODO: In time, we should notice the caller of this error by
2690 * telling him that this is a version error.
2691 */
2692 continue;
2693 }
55cc08a6
DG
2694 ua_sess = lookup_session_by_app(usess, app);
2695 if (ua_sess == NULL) {
2696 continue;
2697 }
2698
2699 /* Lookup channel in the ust app session */
bec39940
DG
2700 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2701 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2702 if (ua_chan_node == NULL) {
2703 continue;
2704 }
2705 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2706 node);
2707
2708 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2709 if (ret < 0) {
2710 continue;
2711 }
2712 }
2713
55cc08a6
DG
2714 rcu_read_unlock();
2715 return ret;
2716}
2717
76d45b40
DG
2718/*
2719 * Enable event for a channel from a UST session for a specific PID.
2720 */
2721int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2722 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2723{
2724 int ret = 0;
bec39940 2725 struct lttng_ht_iter iter;
18eace3b 2726 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
2727 struct ust_app *app;
2728 struct ust_app_session *ua_sess;
2729 struct ust_app_channel *ua_chan;
2730 struct ust_app_event *ua_event;
2731
2732 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2733
2734 rcu_read_lock();
2735
2736 app = ust_app_find_by_pid(pid);
2737 if (app == NULL) {
2738 ERR("UST app enable event per PID %d not found", pid);
2739 ret = -1;
2740 goto error;
2741 }
2742
e0c7ec2b
DG
2743 if (!app->compatible) {
2744 ret = 0;
2745 goto error;
2746 }
2747
76d45b40 2748 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2749 if (!ua_sess) {
2750 /* The application has problem or is probably dead. */
2751 goto error;
2752 }
76d45b40
DG
2753
2754 /* Lookup channel in the ust app session */
bec39940
DG
2755 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2756 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2757 /* If the channel is not found, there is a code flow error */
2758 assert(ua_chan_node);
2759
2760 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2761
18eace3b
DG
2762 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2763 uevent->filter, uevent->attr.loglevel);
2764 if (ua_event == NULL) {
76d45b40
DG
2765 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2766 if (ret < 0) {
2767 goto error;
2768 }
2769 } else {
76d45b40
DG
2770 ret = enable_ust_app_event(ua_sess, ua_event, app);
2771 if (ret < 0) {
2772 goto error;
2773 }
2774 }
2775
2776error:
2777 rcu_read_unlock();
2778 return ret;
2779}
7f79d3a1
DG
2780
2781/*
2782 * Disable event for a channel from a UST session for a specific PID.
2783 */
2784int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2785 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2786{
2787 int ret = 0;
bec39940
DG
2788 struct lttng_ht_iter iter;
2789 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2790 struct ust_app *app;
2791 struct ust_app_session *ua_sess;
2792 struct ust_app_channel *ua_chan;
2793 struct ust_app_event *ua_event;
2794
2795 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2796
2797 rcu_read_lock();
2798
2799 app = ust_app_find_by_pid(pid);
2800 if (app == NULL) {
2801 ERR("UST app disable event per PID %d not found", pid);
2802 ret = -1;
2803 goto error;
2804 }
2805
e0c7ec2b
DG
2806 if (!app->compatible) {
2807 ret = 0;
2808 goto error;
2809 }
2810
7f79d3a1 2811 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2812 if (!ua_sess) {
2813 /* The application has problem or is probably dead. */
2814 goto error;
2815 }
7f79d3a1
DG
2816
2817 /* Lookup channel in the ust app session */
bec39940
DG
2818 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2819 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2820 if (ua_chan_node == NULL) {
2821 /* Channel does not exist, skip disabling */
2822 goto error;
2823 }
2824 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2825
bec39940
DG
2826 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2827 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2828 if (ua_event_node == NULL) {
2829 /* Event does not exist, skip disabling */
2830 goto error;
2831 }
2832 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2833
2834 ret = disable_ust_app_event(ua_sess, ua_event, app);
2835 if (ret < 0) {
2836 goto error;
2837 }
2838
2839error:
2840 rcu_read_unlock();
2841 return ret;
2842}
e0c7ec2b
DG
2843
2844/*
2845 * Validate version of UST apps and set the compatible bit.
2846 */
2847int ust_app_validate_version(int sock)
2848{
2849 int ret;
2850 struct ust_app *app;
2851
2852 rcu_read_lock();
2853
2854 app = find_app_by_sock(sock);
2855 assert(app);
2856
86acf0da
DG
2857 health_code_update(&health_thread_cmd);
2858
e0c7ec2b
DG
2859 ret = ustctl_tracer_version(sock, &app->version);
2860 if (ret < 0) {
2861 goto error;
2862 }
2863
2864 /* Validate version */
aee0cea0 2865 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2866 goto error;
2867 }
2868
68264071 2869 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2870 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2871 UST_APP_MAJOR_VERSION);
2872 app->compatible = 1;
2873 rcu_read_unlock();
86acf0da 2874 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2875 return 0;
2876
2877error:
68264071 2878 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2879 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2880 UST_APP_MAJOR_VERSION);
2881 app->compatible = 0;
2882 rcu_read_unlock();
86acf0da 2883 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2884 return -1;
2885}
4466912f
DG
2886
2887/*
2888 * Calibrate registered applications.
2889 */
2890int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2891{
2892 int ret = 0;
2893 struct lttng_ht_iter iter;
2894 struct ust_app *app;
2895
2896 rcu_read_lock();
2897
852d0037 2898 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2899 if (!app->compatible) {
2900 /*
2901 * TODO: In time, we should notice the caller of this error by
2902 * telling him that this is a version error.
2903 */
2904 continue;
2905 }
2906
86acf0da
DG
2907 health_code_update(&health_thread_cmd);
2908
852d0037 2909 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2910 if (ret < 0) {
2911 switch (ret) {
2912 case -ENOSYS:
2913 /* Means that it's not implemented on the tracer side. */
2914 ret = 0;
2915 break;
2916 default:
2917 /* TODO: Report error to user */
2918 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2919 app->pid, ret);
4466912f
DG
2920 break;
2921 }
2922 }
2923 }
2924
2925 DBG("UST app global domain calibration finished");
2926
2927 rcu_read_unlock();
2928
86acf0da
DG
2929 health_code_update(&health_thread_cmd);
2930
4466912f
DG
2931 return ret;
2932}
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