Fix: change function name for better meaning
[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;
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97}
98
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99/*
100 * Unique add of an ust app event in the given ht. This uses the custom
101 * ht_match_ust_app_event match function and the event name as hash.
102 */
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103static void add_unique_ust_app_event(struct lttng_ht *ht,
104 struct ust_app_event *event)
105{
106 struct cds_lfht_node *node_ptr;
107 struct ust_app_ht_key key;
108
109 assert(ht);
110 assert(ht->ht);
111 assert(event);
112
113 key.name = event->attr.name;
114 key.filter = event->filter;
115 key.loglevel = event->attr.loglevel;
116
117 node_ptr = cds_lfht_add_unique(ht->ht,
118 ht->hash_fct(event->node.key, lttng_ht_seed),
119 ht_match_ust_app_event, &key, &event->node.node);
120 assert(node_ptr == &event->node.node);
121}
122
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123/*
124 * Delete ust context safely. RCU read lock must be held before calling
125 * this function.
126 */
127static
128void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
129{
130 if (ua_ctx->obj) {
131 ustctl_release_object(sock, ua_ctx->obj);
132 free(ua_ctx->obj);
133 }
134 free(ua_ctx);
135}
136
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137/*
138 * Delete ust app event safely. RCU read lock must be held before calling
139 * this function.
140 */
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141static
142void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
d80a6244 143{
53a80697 144 free(ua_event->filter);
d80a6244 145
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146 if (ua_event->obj != NULL) {
147 ustctl_release_object(sock, ua_event->obj);
148 free(ua_event->obj);
149 }
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150 free(ua_event);
151}
152
153/*
154 * Delete ust app stream safely. RCU read lock must be held before calling
155 * this function.
156 */
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157static
158void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
d80a6244 159{
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160 if (stream->obj) {
161 ustctl_release_object(sock, stream->obj);
4063050c 162 lttng_fd_put(LTTNG_FD_APPS, 2);
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163 free(stream->obj);
164 }
84cd17c6 165 free(stream);
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166}
167
168/*
169 * Delete ust app channel safely. RCU read lock must be held before calling
170 * this function.
171 */
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172static
173void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
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174{
175 int ret;
bec39940 176 struct lttng_ht_iter iter;
d80a6244 177 struct ust_app_event *ua_event;
55cc08a6 178 struct ust_app_ctx *ua_ctx;
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179 struct ltt_ust_stream *stream, *stmp;
180
55cc08a6 181 /* Wipe stream */
d80a6244 182 cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
84cd17c6 183 cds_list_del(&stream->list);
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184 delete_ust_app_stream(sock, stream);
185 }
186
55cc08a6 187 /* Wipe context */
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188 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) {
189 ret = lttng_ht_del(ua_chan->ctx, &iter);
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190 assert(!ret);
191 delete_ust_app_ctx(sock, ua_ctx);
192 }
bec39940 193 lttng_ht_destroy(ua_chan->ctx);
d80a6244 194
55cc08a6 195 /* Wipe events */
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196 cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event,
197 node.node) {
198 ret = lttng_ht_del(ua_chan->events, &iter);
525b0740 199 assert(!ret);
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200 delete_ust_app_event(sock, ua_event);
201 }
bec39940 202 lttng_ht_destroy(ua_chan->events);
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203
204 if (ua_chan->obj != NULL) {
205 ustctl_release_object(sock, ua_chan->obj);
4063050c 206 lttng_fd_put(LTTNG_FD_APPS, 2);
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207 free(ua_chan->obj);
208 }
84cd17c6 209 free(ua_chan);
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210}
211
212/*
213 * Delete ust app session safely. RCU read lock must be held before calling
214 * this function.
215 */
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216static
217void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
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218{
219 int ret;
bec39940 220 struct lttng_ht_iter iter;
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221 struct ust_app_channel *ua_chan;
222
223 if (ua_sess->metadata) {
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224 if (ua_sess->metadata->stream_obj) {
225 ustctl_release_object(sock, ua_sess->metadata->stream_obj);
4063050c 226 lttng_fd_put(LTTNG_FD_APPS, 2);
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227 free(ua_sess->metadata->stream_obj);
228 }
229 if (ua_sess->metadata->obj) {
230 ustctl_release_object(sock, ua_sess->metadata->obj);
4063050c 231 lttng_fd_put(LTTNG_FD_APPS, 2);
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232 free(ua_sess->metadata->obj);
233 }
a2c0da86 234 trace_ust_destroy_metadata(ua_sess->metadata);
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235 }
236
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237 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
238 node.node) {
239 ret = lttng_ht_del(ua_sess->channels, &iter);
525b0740 240 assert(!ret);
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241 delete_ust_app_channel(sock, ua_chan);
242 }
bec39940 243 lttng_ht_destroy(ua_sess->channels);
d80a6244 244
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MD
245 if (ua_sess->handle != -1) {
246 ustctl_release_handle(sock, ua_sess->handle);
247 }
8b366481 248 free(ua_sess);
d80a6244 249}
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250
251/*
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252 * Delete a traceable application structure from the global list. Never call
253 * this function outside of a call_rcu call.
91d76f53 254 */
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255static
256void delete_ust_app(struct ust_app *app)
91d76f53 257{
8b366481 258 int ret, sock;
d42f20df 259 struct ust_app_session *ua_sess, *tmp_ua_sess;
44d3bd01 260
f6a9efaa 261 rcu_read_lock();
44d3bd01 262
d80a6244 263 /* Delete ust app sessions info */
852d0037
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;
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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
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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
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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
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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
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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
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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
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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
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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/*
5922e6c2 724 * Create metadata stream onto the UST tracer for a given session.
91d76f53 725 */
5922e6c2 726static int create_ust_metadata_stream(struct ust_app *app,
5b4a0ec0 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 1032/*
3d8ca23b 1033 * Create a session on the tracer side for the given app.
421cb601 1034 *
3d8ca23b
DG
1035 * On success, ua_sess_ptr is populated with the session pointer or else left
1036 * untouched. If the session was created, is_created is set to 1. On error,
1037 * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can
1038 * be NULL.
1039 *
1040 * Returns 0 on success or else a negative code which is either -ENOMEM or
1041 * -ENOTCONN which is the default code if the ustctl_create_session fails.
421cb601 1042 */
3d8ca23b
DG
1043static int create_ust_app_session(struct ltt_ust_session *usess,
1044 struct ust_app *app, struct ust_app_session **ua_sess_ptr,
1045 int *is_created)
421cb601 1046{
3d8ca23b 1047 int ret, created = 0;
421cb601
DG
1048 struct ust_app_session *ua_sess;
1049
3d8ca23b
DG
1050 assert(usess);
1051 assert(app);
1052 assert(ua_sess_ptr);
1053
86acf0da
DG
1054 health_code_update(&health_thread_cmd);
1055
421cb601
DG
1056 ua_sess = lookup_session_by_app(usess, app);
1057 if (ua_sess == NULL) {
a991f516 1058 DBG2("UST app pid: %d session id %d not found, creating it",
852d0037 1059 app->pid, usess->id);
421cb601
DG
1060 ua_sess = alloc_ust_app_session();
1061 if (ua_sess == NULL) {
1062 /* Only malloc can failed so something is really wrong */
3d8ca23b
DG
1063 ret = -ENOMEM;
1064 goto error;
421cb601 1065 }
477d7741 1066 shadow_copy_session(ua_sess, usess, app);
3d8ca23b 1067 created = 1;
421cb601
DG
1068 }
1069
86acf0da
DG
1070 health_code_update(&health_thread_cmd);
1071
421cb601 1072 if (ua_sess->handle == -1) {
852d0037 1073 ret = ustctl_create_session(app->sock);
421cb601 1074 if (ret < 0) {
852d0037 1075 ERR("Creating session for app pid %d", app->pid);
0f83395d 1076 delete_ust_app_session(-1, ua_sess);
3d8ca23b
DG
1077 if (ret != -ENOMEM) {
1078 /*
1079 * Tracer is probably gone or got an internal error so let's
1080 * behave like it will soon unregister or not usable.
1081 */
1082 ret = -ENOTCONN;
1083 }
1084 goto error;
421cb601
DG
1085 }
1086
421cb601
DG
1087 ua_sess->handle = ret;
1088
1089 /* Add ust app session to app's HT */
2c348c10 1090 lttng_ht_node_init_ulong(&ua_sess->node, (unsigned long) ua_sess->id);
bec39940 1091 lttng_ht_add_unique_ulong(app->sessions, &ua_sess->node);
421cb601
DG
1092
1093 DBG2("UST app session created successfully with handle %d", ret);
1094 }
1095
3d8ca23b
DG
1096 *ua_sess_ptr = ua_sess;
1097 if (is_created) {
1098 *is_created = created;
1099 }
1100 /* Everything went well. */
1101 ret = 0;
1102
1103error:
86acf0da 1104 health_code_update(&health_thread_cmd);
3d8ca23b 1105 return ret;
421cb601
DG
1106}
1107
55cc08a6
DG
1108/*
1109 * Create a context for the channel on the tracer.
1110 */
1111static
1112int create_ust_app_channel_context(struct ust_app_session *ua_sess,
1113 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
1114 struct ust_app *app)
1115{
1116 int ret = 0;
bec39940
DG
1117 struct lttng_ht_iter iter;
1118 struct lttng_ht_node_ulong *node;
55cc08a6
DG
1119 struct ust_app_ctx *ua_ctx;
1120
1121 DBG2("UST app adding context to channel %s", ua_chan->name);
1122
bec39940
DG
1123 lttng_ht_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx), &iter);
1124 node = lttng_ht_iter_get_node_ulong(&iter);
55cc08a6
DG
1125 if (node != NULL) {
1126 ret = -EEXIST;
1127 goto error;
1128 }
1129
1130 ua_ctx = alloc_ust_app_ctx(uctx);
1131 if (ua_ctx == NULL) {
1132 /* malloc failed */
1133 ret = -1;
1134 goto error;
1135 }
1136
bec39940
DG
1137 lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx);
1138 lttng_ht_add_unique_ulong(ua_chan->ctx, &ua_ctx->node);
55cc08a6
DG
1139
1140 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
1141 if (ret < 0) {
1142 goto error;
1143 }
1144
1145error:
1146 return ret;
1147}
1148
edb67388
DG
1149/*
1150 * Enable on the tracer side a ust app event for the session and channel.
1151 */
1152static
1153int enable_ust_app_event(struct ust_app_session *ua_sess,
35a9059d 1154 struct ust_app_event *ua_event, struct ust_app *app)
edb67388
DG
1155{
1156 int ret;
1157
1158 ret = enable_ust_event(app, ua_sess, ua_event);
1159 if (ret < 0) {
1160 goto error;
1161 }
1162
1163 ua_event->enabled = 1;
1164
1165error:
1166 return ret;
1167}
1168
9730260e
DG
1169/*
1170 * Disable on the tracer side a ust app event for the session and channel.
1171 */
1172static int disable_ust_app_event(struct ust_app_session *ua_sess,
7f79d3a1 1173 struct ust_app_event *ua_event, struct ust_app *app)
9730260e
DG
1174{
1175 int ret;
1176
1177 ret = disable_ust_event(app, ua_sess, ua_event);
1178 if (ret < 0) {
1179 goto error;
1180 }
1181
1182 ua_event->enabled = 0;
1183
1184error:
1185 return ret;
1186}
1187
78f0bacd
DG
1188/*
1189 * Lookup ust app channel for session and disable it on the tracer side.
1190 */
8535a6d9
DG
1191static
1192int disable_ust_app_channel(struct ust_app_session *ua_sess,
1193 struct ust_app_channel *ua_chan, struct ust_app *app)
78f0bacd 1194{
8535a6d9 1195 int ret;
78f0bacd
DG
1196
1197 ret = disable_ust_channel(app, ua_sess, ua_chan);
1198 if (ret < 0) {
1199 goto error;
1200 }
1201
8535a6d9
DG
1202 ua_chan->enabled = 0;
1203
78f0bacd
DG
1204error:
1205 return ret;
1206}
1207
1208/*
1209 * Lookup ust app channel for session and enable it on the tracer side.
1210 */
1211static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1212 struct ltt_ust_channel *uchan, struct ust_app *app)
1213{
1214 int ret = 0;
bec39940
DG
1215 struct lttng_ht_iter iter;
1216 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1217 struct ust_app_channel *ua_chan;
1218
bec39940
DG
1219 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1220 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
78f0bacd 1221 if (ua_chan_node == NULL) {
a991f516
MD
1222 DBG2("Unable to find channel %s in ust session id %u",
1223 uchan->name, ua_sess->id);
78f0bacd
DG
1224 goto error;
1225 }
1226
1227 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1228
1229 ret = enable_ust_channel(app, ua_sess, ua_chan);
1230 if (ret < 0) {
1231 goto error;
1232 }
1233
1234error:
1235 return ret;
1236}
1237
284d8f55 1238/*
4d710ac2
DG
1239 * Create UST app channel and create it on the tracer. Set ua_chanp of the
1240 * newly created channel if not NULL.
284d8f55 1241 */
4d710ac2
DG
1242static int create_ust_app_channel(struct ust_app_session *ua_sess,
1243 struct ltt_ust_channel *uchan, struct ust_app *app,
1244 struct ust_app_channel **ua_chanp)
5b4a0ec0
DG
1245{
1246 int ret = 0;
bec39940
DG
1247 struct lttng_ht_iter iter;
1248 struct lttng_ht_node_str *ua_chan_node;
5b4a0ec0
DG
1249 struct ust_app_channel *ua_chan;
1250
1251 /* Lookup channel in the ust app session */
bec39940
DG
1252 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
1253 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
fc34caaa 1254 if (ua_chan_node != NULL) {
5b4a0ec0 1255 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
fc34caaa 1256 goto end;
5b4a0ec0
DG
1257 }
1258
fc34caaa
DG
1259 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1260 if (ua_chan == NULL) {
1261 /* Only malloc can fail here */
4d710ac2 1262 ret = -ENOMEM;
fc34caaa
DG
1263 goto error;
1264 }
1265 shadow_copy_channel(ua_chan, uchan);
1266
5b4a0ec0
DG
1267 ret = create_ust_channel(app, ua_sess, ua_chan);
1268 if (ret < 0) {
fc34caaa 1269 /* Not found previously means that it does not exist on the tracer */
49c336c1 1270 assert(ret != -LTTNG_UST_ERR_EXIST);
5b4a0ec0
DG
1271 goto error;
1272 }
1273
4d710ac2 1274 /* Only add the channel if successful on the tracer side. */
58f3ca76
DG
1275 lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node);
1276
fc34caaa 1277 DBG2("UST app create channel %s for PID %d completed", ua_chan->name,
852d0037 1278 app->pid);
fc34caaa
DG
1279
1280end:
4d710ac2
DG
1281 if (ua_chanp) {
1282 *ua_chanp = ua_chan;
1283 }
1284
1285 /* Everything went well. */
1286 return 0;
5b4a0ec0
DG
1287
1288error:
fc34caaa 1289 delete_ust_app_channel(-1, ua_chan);
4d710ac2 1290 return ret;
5b4a0ec0
DG
1291}
1292
1293/*
1294 * Create UST app event and create it on the tracer side.
1295 */
edb67388
DG
1296static
1297int create_ust_app_event(struct ust_app_session *ua_sess,
1298 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1299 struct ust_app *app)
284d8f55 1300{
edb67388 1301 int ret = 0;
5b4a0ec0 1302 struct ust_app_event *ua_event;
284d8f55 1303
5b4a0ec0 1304 /* Get event node */
18eace3b
DG
1305 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
1306 uevent->filter, uevent->attr.loglevel);
1307 if (ua_event != NULL) {
fc34caaa 1308 ret = -EEXIST;
edb67388
DG
1309 goto end;
1310 }
5b4a0ec0 1311
edb67388
DG
1312 /* Does not exist so create one */
1313 ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1314 if (ua_event == NULL) {
1315 /* Only malloc can failed so something is really wrong */
1316 ret = -ENOMEM;
fc34caaa 1317 goto end;
5b4a0ec0 1318 }
edb67388 1319 shadow_copy_event(ua_event, uevent);
5b4a0ec0 1320
edb67388 1321 /* Create it on the tracer side */
5b4a0ec0 1322 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
284d8f55 1323 if (ret < 0) {
fc34caaa 1324 /* Not found previously means that it does not exist on the tracer */
76f66f63 1325 assert(ret != -LTTNG_UST_ERR_EXIST);
284d8f55
DG
1326 goto error;
1327 }
1328
18eace3b 1329 add_unique_ust_app_event(ua_chan->events, ua_event);
284d8f55 1330
fc34caaa 1331 DBG2("UST app create event %s for PID %d completed", ua_event->name,
852d0037 1332 app->pid);
7f79d3a1 1333
edb67388 1334end:
fc34caaa
DG
1335 return ret;
1336
5b4a0ec0 1337error:
fc34caaa
DG
1338 /* Valid. Calling here is already in a read side lock */
1339 delete_ust_app_event(-1, ua_event);
edb67388 1340 return ret;
5b4a0ec0
DG
1341}
1342
1343/*
1344 * Create UST metadata and open it on the tracer side.
1345 */
1346static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1347 char *pathname, struct ust_app *app)
1348{
1349 int ret = 0;
1350
1351 if (ua_sess->metadata == NULL) {
1352 /* Allocate UST metadata */
1353 ua_sess->metadata = trace_ust_create_metadata(pathname);
1354 if (ua_sess->metadata == NULL) {
fc34caaa 1355 /* malloc() failed */
5b4a0ec0
DG
1356 goto error;
1357 }
1358
1359 ret = open_ust_metadata(app, ua_sess);
1360 if (ret < 0) {
7db205b5
DG
1361 DBG3("Opening metadata failed. Cleaning up memory");
1362
fc34caaa
DG
1363 /* Cleanup failed metadata struct */
1364 free(ua_sess->metadata);
7db205b5
DG
1365 /*
1366 * This is very important because delete_ust_app_session check if
1367 * the pointer is null or not in order to delete the metadata.
1368 */
1369 ua_sess->metadata = NULL;
5b4a0ec0
DG
1370 goto error;
1371 }
1372
852d0037 1373 DBG2("UST metadata opened for app pid %d", app->pid);
5b4a0ec0
DG
1374 }
1375
1376 /* Open UST metadata stream */
1377 if (ua_sess->metadata->stream_obj == NULL) {
5922e6c2 1378 ret = create_ust_metadata_stream(app, ua_sess);
5b4a0ec0
DG
1379 if (ret < 0) {
1380 goto error;
1381 }
1382
477d7741
MD
1383 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1384 "%s/metadata", ua_sess->path);
5b4a0ec0
DG
1385 if (ret < 0) {
1386 PERROR("asprintf UST create stream");
1387 goto error;
1388 }
1389
1390 DBG2("UST metadata stream object created for app pid %d",
852d0037 1391 app->pid);
5b4a0ec0
DG
1392 } else {
1393 ERR("Attempting to create stream without metadata opened");
1394 goto error;
1395 }
1396
1397 return 0;
1398
1399error:
1400 return -1;
1401}
1402
1403/*
1404 * Return pointer to traceable apps list.
1405 */
bec39940 1406struct lttng_ht *ust_app_get_ht(void)
5b4a0ec0
DG
1407{
1408 return ust_app_ht;
1409}
1410
1411/*
1412 * Return ust app pointer or NULL if not found.
1413 */
1414struct ust_app *ust_app_find_by_pid(pid_t pid)
1415{
bec39940
DG
1416 struct lttng_ht_node_ulong *node;
1417 struct lttng_ht_iter iter;
5b4a0ec0
DG
1418
1419 rcu_read_lock();
bec39940
DG
1420 lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter);
1421 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0
DG
1422 if (node == NULL) {
1423 DBG2("UST app no found with pid %d", pid);
1424 goto error;
1425 }
1426 rcu_read_unlock();
1427
1428 DBG2("Found UST app by pid %d", pid);
1429
852d0037 1430 return caa_container_of(node, struct ust_app, pid_n);
5b4a0ec0
DG
1431
1432error:
1433 rcu_read_unlock();
1434 return NULL;
1435}
1436
1437/*
1438 * Using pid and uid (of the app), allocate a new ust_app struct and
1439 * add it to the global traceable app list.
1440 *
0df502fd
MD
1441 * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1442 * bitness is not supported.
5b4a0ec0
DG
1443 */
1444int ust_app_register(struct ust_register_msg *msg, int sock)
1445{
1446 struct ust_app *lta;
799e2c4f 1447 int ret;
5b4a0ec0 1448
173af62f
DG
1449 if ((msg->bits_per_long == 64 &&
1450 (uatomic_read(&ust_consumerd64_fd) == -EINVAL))
1451 || (msg->bits_per_long == 32 &&
1452 (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) {
f943b0fb 1453 ERR("Registration failed: application \"%s\" (pid: %d) has "
7753dea8
MD
1454 "%d-bit long, but no consumerd for this long size is available.\n",
1455 msg->name, msg->pid, msg->bits_per_long);
799e2c4f
MD
1456 ret = close(sock);
1457 if (ret) {
1458 PERROR("close");
1459 }
4063050c 1460 lttng_fd_put(LTTNG_FD_APPS, 1);
0df502fd
MD
1461 return -EINVAL;
1462 }
3f2c5fcc
MD
1463 if (msg->major != LTTNG_UST_COMM_MAJOR) {
1464 ERR("Registration failed: application \"%s\" (pid: %d) has "
1465 "communication protocol version %u.%u, but sessiond supports 2.x.\n",
1466 msg->name, msg->pid, msg->major, msg->minor);
799e2c4f
MD
1467 ret = close(sock);
1468 if (ret) {
1469 PERROR("close");
1470 }
4063050c 1471 lttng_fd_put(LTTNG_FD_APPS, 1);
3f2c5fcc
MD
1472 return -EINVAL;
1473 }
5b4a0ec0
DG
1474 lta = zmalloc(sizeof(struct ust_app));
1475 if (lta == NULL) {
1476 PERROR("malloc");
1477 return -ENOMEM;
1478 }
1479
1480 lta->ppid = msg->ppid;
1481 lta->uid = msg->uid;
1482 lta->gid = msg->gid;
e0c7ec2b 1483 lta->compatible = 0; /* Not compatible until proven */
7753dea8 1484 lta->bits_per_long = msg->bits_per_long;
5b4a0ec0
DG
1485 lta->v_major = msg->major;
1486 lta->v_minor = msg->minor;
1487 strncpy(lta->name, msg->name, sizeof(lta->name));
1488 lta->name[16] = '\0';
bec39940 1489 lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
5b4a0ec0 1490
852d0037
DG
1491 lta->pid = msg->pid;
1492 lttng_ht_node_init_ulong(&lta->pid_n, (unsigned long)lta->pid);
1493 lta->sock = sock;
1494 lttng_ht_node_init_ulong(&lta->sock_n, (unsigned long)lta->sock);
5b4a0ec0 1495
d42f20df
DG
1496 CDS_INIT_LIST_HEAD(&lta->teardown_head);
1497
5b4a0ec0 1498 rcu_read_lock();
852d0037
DG
1499
1500 /*
1501 * On a re-registration, we want to kick out the previous registration of
1502 * that pid
1503 */
1504 lttng_ht_add_replace_ulong(ust_app_ht, &lta->pid_n);
1505
1506 /*
1507 * The socket _should_ be unique until _we_ call close. So, a add_unique
1508 * for the ust_app_ht_by_sock is used which asserts fail if the entry was
1509 * already in the table.
1510 */
1511 lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &lta->sock_n);
1512
5b4a0ec0
DG
1513 rcu_read_unlock();
1514
1515 DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
852d0037
DG
1516 " (version %d.%d)", lta->pid, lta->ppid, lta->uid, lta->gid,
1517 lta->sock, lta->name, lta->v_major, lta->v_minor);
5b4a0ec0
DG
1518
1519 return 0;
1520}
1521
1522/*
1523 * Unregister app by removing it from the global traceable app list and freeing
1524 * the data struct.
1525 *
1526 * The socket is already closed at this point so no close to sock.
1527 */
1528void ust_app_unregister(int sock)
1529{
1530 struct ust_app *lta;
bec39940
DG
1531 struct lttng_ht_node_ulong *node;
1532 struct lttng_ht_iter iter;
d42f20df 1533 struct ust_app_session *ua_sess;
525b0740 1534 int ret;
5b4a0ec0
DG
1535
1536 rcu_read_lock();
886459c6 1537
5b4a0ec0 1538 /* Get the node reference for a call_rcu */
852d0037 1539 lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter);
bec39940 1540 node = lttng_ht_iter_get_node_ulong(&iter);
5b4a0ec0 1541 if (node == NULL) {
852d0037 1542 ERR("Unable to find app by sock %d", sock);
5b4a0ec0
DG
1543 goto error;
1544 }
284d8f55 1545
852d0037
DG
1546 lta = caa_container_of(node, struct ust_app, sock_n);
1547
1548 DBG("PID %d unregistering with sock %d", lta->pid, sock);
1549
886459c6 1550 /* Remove application from PID hash table */
852d0037
DG
1551 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
1552 assert(!ret);
1553
1554 /* Assign second node for deletion */
1555 iter.iter.node = &lta->pid_n.node;
1556
5b98a774
DG
1557 /*
1558 * Ignore return value since the node might have been removed before by an
1559 * add replace during app registration because the PID can be reassigned by
1560 * the OS.
1561 */
bec39940 1562 ret = lttng_ht_del(ust_app_ht, &iter);
5b98a774
DG
1563 if (ret) {
1564 DBG3("Unregister app by PID %d failed. This can happen on pid reuse",
1565 lta->pid);
1566 }
852d0037 1567
d42f20df
DG
1568 /* Remove sessions so they are not visible during deletion.*/
1569 cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess,
1570 node.node) {
1571 ret = lttng_ht_del(lta->sessions, &iter);
1572 if (ret) {
1573 /* The session was already removed so scheduled for teardown. */
1574 continue;
1575 }
1576
1577 /*
1578 * Add session to list for teardown. This is safe since at this point we
1579 * are the only one using this list.
1580 */
1581 cds_list_add(&ua_sess->teardown_node, &lta->teardown_head);
1582 }
1583
852d0037
DG
1584 /* Free memory */
1585 call_rcu(&lta->pid_n.head, delete_ust_app_rcu);
1586
284d8f55 1587error:
5b4a0ec0
DG
1588 rcu_read_unlock();
1589 return;
284d8f55
DG
1590}
1591
1592/*
5b4a0ec0 1593 * Return traceable_app_count
284d8f55 1594 */
5b4a0ec0 1595unsigned long ust_app_list_count(void)
284d8f55 1596{
5b4a0ec0 1597 unsigned long count;
284d8f55 1598
5b4a0ec0 1599 rcu_read_lock();
bec39940 1600 count = lttng_ht_get_count(ust_app_ht);
5b4a0ec0 1601 rcu_read_unlock();
284d8f55 1602
5b4a0ec0 1603 return count;
284d8f55
DG
1604}
1605
5b4a0ec0
DG
1606/*
1607 * Fill events array with all events name of all registered apps.
1608 */
1609int ust_app_list_events(struct lttng_event **events)
421cb601 1610{
5b4a0ec0
DG
1611 int ret, handle;
1612 size_t nbmem, count = 0;
bec39940 1613 struct lttng_ht_iter iter;
5b4a0ec0 1614 struct ust_app *app;
c617c0c6 1615 struct lttng_event *tmp_event;
421cb601 1616
5b4a0ec0 1617 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
1618 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event));
1619 if (tmp_event == NULL) {
5b4a0ec0
DG
1620 PERROR("zmalloc ust app events");
1621 ret = -ENOMEM;
421cb601
DG
1622 goto error;
1623 }
1624
5b4a0ec0 1625 rcu_read_lock();
421cb601 1626
852d0037 1627 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
90eaa0d2 1628 struct lttng_ust_tracepoint_iter uiter;
ac3bd9c0 1629
86acf0da
DG
1630 health_code_update(&health_thread_cmd);
1631
e0c7ec2b
DG
1632 if (!app->compatible) {
1633 /*
1634 * TODO: In time, we should notice the caller of this error by
1635 * telling him that this is a version error.
1636 */
1637 continue;
1638 }
852d0037 1639 handle = ustctl_tracepoint_list(app->sock);
5b4a0ec0
DG
1640 if (handle < 0) {
1641 ERR("UST app list events getting handle failed for app pid %d",
852d0037 1642 app->pid);
5b4a0ec0
DG
1643 continue;
1644 }
421cb601 1645
852d0037 1646 while ((ret = ustctl_tracepoint_list_get(app->sock, handle,
fb54cdbf 1647 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1648 health_code_update(&health_thread_cmd);
815564d8 1649 if (count >= nbmem) {
d7b3776f 1650 /* In case the realloc fails, we free the memory */
c617c0c6
MD
1651 void *ptr;
1652
815564d8
MD
1653 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1654 2 * nbmem);
1655 nbmem *= 2;
c617c0c6
MD
1656 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event));
1657 if (ptr == NULL) {
5b4a0ec0 1658 PERROR("realloc ust app events");
c617c0c6 1659 free(tmp_event);
5b4a0ec0
DG
1660 ret = -ENOMEM;
1661 goto rcu_error;
1662 }
c617c0c6 1663 tmp_event = ptr;
5b4a0ec0 1664 }
c617c0c6
MD
1665 memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1666 tmp_event[count].loglevel = uiter.loglevel;
1667 tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT;
1668 tmp_event[count].pid = app->pid;
1669 tmp_event[count].enabled = -1;
5b4a0ec0 1670 count++;
421cb601 1671 }
421cb601
DG
1672 }
1673
5b4a0ec0 1674 ret = count;
c617c0c6 1675 *events = tmp_event;
421cb601 1676
5b4a0ec0 1677 DBG2("UST app list events done (%zu events)", count);
421cb601 1678
5b4a0ec0
DG
1679rcu_error:
1680 rcu_read_unlock();
421cb601 1681error:
86acf0da 1682 health_code_update(&health_thread_cmd);
5b4a0ec0 1683 return ret;
421cb601
DG
1684}
1685
f37d259d
MD
1686/*
1687 * Fill events array with all events name of all registered apps.
1688 */
1689int ust_app_list_event_fields(struct lttng_event_field **fields)
1690{
1691 int ret, handle;
1692 size_t nbmem, count = 0;
1693 struct lttng_ht_iter iter;
1694 struct ust_app *app;
c617c0c6 1695 struct lttng_event_field *tmp_event;
f37d259d
MD
1696
1697 nbmem = UST_APP_EVENT_LIST_SIZE;
c617c0c6
MD
1698 tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field));
1699 if (tmp_event == NULL) {
f37d259d
MD
1700 PERROR("zmalloc ust app event fields");
1701 ret = -ENOMEM;
1702 goto error;
1703 }
1704
1705 rcu_read_lock();
1706
1707 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
1708 struct lttng_ust_field_iter uiter;
1709
86acf0da
DG
1710 health_code_update(&health_thread_cmd);
1711
f37d259d
MD
1712 if (!app->compatible) {
1713 /*
1714 * TODO: In time, we should notice the caller of this error by
1715 * telling him that this is a version error.
1716 */
1717 continue;
1718 }
1719 handle = ustctl_tracepoint_field_list(app->sock);
1720 if (handle < 0) {
1721 ERR("UST app list event fields getting handle failed for app pid %d",
1722 app->pid);
1723 continue;
1724 }
1725
1726 while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle,
fb54cdbf 1727 &uiter)) != -LTTNG_UST_ERR_NOENT) {
86acf0da 1728 health_code_update(&health_thread_cmd);
f37d259d 1729 if (count >= nbmem) {
d7b3776f 1730 /* In case the realloc fails, we free the memory */
c617c0c6
MD
1731 void *ptr;
1732
f37d259d
MD
1733 DBG2("Reallocating event field list from %zu to %zu entries", nbmem,
1734 2 * nbmem);
1735 nbmem *= 2;
c617c0c6
MD
1736 ptr = realloc(tmp_event, nbmem * sizeof(struct lttng_event_field));
1737 if (ptr == NULL) {
f37d259d 1738 PERROR("realloc ust app event fields");
c617c0c6 1739 free(tmp_event);
f37d259d
MD
1740 ret = -ENOMEM;
1741 goto rcu_error;
1742 }
c617c0c6 1743 tmp_event = ptr;
f37d259d 1744 }
f37d259d 1745
c617c0c6
MD
1746 memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN);
1747 tmp_event[count].type = uiter.type;
1748 tmp_event[count].nowrite = uiter.nowrite;
f37d259d 1749
c617c0c6
MD
1750 memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN);
1751 tmp_event[count].event.loglevel = uiter.loglevel;
1752 tmp_event[count].event.type = LTTNG_UST_TRACEPOINT;
1753 tmp_event[count].event.pid = app->pid;
1754 tmp_event[count].event.enabled = -1;
f37d259d
MD
1755 count++;
1756 }
1757 }
1758
1759 ret = count;
c617c0c6 1760 *fields = tmp_event;
f37d259d
MD
1761
1762 DBG2("UST app list event fields done (%zu events)", count);
1763
1764rcu_error:
1765 rcu_read_unlock();
1766error:
86acf0da 1767 health_code_update(&health_thread_cmd);
f37d259d
MD
1768 return ret;
1769}
1770
5b4a0ec0
DG
1771/*
1772 * Free and clean all traceable apps of the global list.
1773 */
1774void ust_app_clean_list(void)
421cb601 1775{
5b4a0ec0 1776 int ret;
659ed79f 1777 struct ust_app *app;
bec39940 1778 struct lttng_ht_iter iter;
421cb601 1779
5b4a0ec0 1780 DBG2("UST app cleaning registered apps hash table");
421cb601 1781
5b4a0ec0 1782 rcu_read_lock();
421cb601 1783
659ed79f 1784 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1785 ret = lttng_ht_del(ust_app_ht, &iter);
525b0740 1786 assert(!ret);
659ed79f 1787 call_rcu(&app->pid_n.head, delete_ust_app_rcu);
421cb601
DG
1788 }
1789
852d0037 1790 /* Cleanup socket hash table */
659ed79f
DG
1791 cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app,
1792 sock_n.node) {
852d0037 1793 ret = lttng_ht_del(ust_app_ht_by_sock, &iter);
bec39940
DG
1794 assert(!ret);
1795 }
852d0037 1796
bec39940 1797 /* Destroy is done only when the ht is empty */
852d0037
DG
1798 lttng_ht_destroy(ust_app_ht);
1799 lttng_ht_destroy(ust_app_ht_by_sock);
421cb601 1800
5b4a0ec0
DG
1801 rcu_read_unlock();
1802}
1803
1804/*
1805 * Init UST app hash table.
1806 */
1807void ust_app_ht_alloc(void)
1808{
bec39940 1809 ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
852d0037 1810 ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
421cb601
DG
1811}
1812
78f0bacd
DG
1813/*
1814 * For a specific UST session, disable the channel for all registered apps.
1815 */
35a9059d 1816int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1817 struct ltt_ust_channel *uchan)
1818{
1819 int ret = 0;
bec39940
DG
1820 struct lttng_ht_iter iter;
1821 struct lttng_ht_node_str *ua_chan_node;
78f0bacd
DG
1822 struct ust_app *app;
1823 struct ust_app_session *ua_sess;
8535a6d9 1824 struct ust_app_channel *ua_chan;
78f0bacd
DG
1825
1826 if (usess == NULL || uchan == NULL) {
1827 ERR("Disabling UST global channel with NULL values");
1828 ret = -1;
1829 goto error;
1830 }
1831
a991f516
MD
1832 DBG2("UST app disabling channel %s from global domain for session id %d",
1833 uchan->name, usess->id);
78f0bacd
DG
1834
1835 rcu_read_lock();
1836
1837 /* For every registered applications */
852d0037 1838 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
bec39940 1839 struct lttng_ht_iter uiter;
e0c7ec2b
DG
1840 if (!app->compatible) {
1841 /*
1842 * TODO: In time, we should notice the caller of this error by
1843 * telling him that this is a version error.
1844 */
1845 continue;
1846 }
78f0bacd
DG
1847 ua_sess = lookup_session_by_app(usess, app);
1848 if (ua_sess == NULL) {
1849 continue;
1850 }
1851
8535a6d9 1852 /* Get channel */
bec39940
DG
1853 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1854 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
8535a6d9
DG
1855 /* If the session if found for the app, the channel must be there */
1856 assert(ua_chan_node);
1857
1858 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1859 /* The channel must not be already disabled */
1860 assert(ua_chan->enabled == 1);
1861
1862 /* Disable channel onto application */
1863 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
78f0bacd
DG
1864 if (ret < 0) {
1865 /* XXX: We might want to report this error at some point... */
1866 continue;
1867 }
1868 }
1869
1870 rcu_read_unlock();
1871
1872error:
1873 return ret;
1874}
1875
1876/*
1877 * For a specific UST session, enable the channel for all registered apps.
1878 */
35a9059d 1879int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
78f0bacd
DG
1880 struct ltt_ust_channel *uchan)
1881{
1882 int ret = 0;
bec39940 1883 struct lttng_ht_iter iter;
78f0bacd
DG
1884 struct ust_app *app;
1885 struct ust_app_session *ua_sess;
1886
1887 if (usess == NULL || uchan == NULL) {
1888 ERR("Adding UST global channel to NULL values");
1889 ret = -1;
1890 goto error;
1891 }
1892
a991f516
MD
1893 DBG2("UST app enabling channel %s to global domain for session id %d",
1894 uchan->name, usess->id);
78f0bacd
DG
1895
1896 rcu_read_lock();
1897
1898 /* For every registered applications */
852d0037 1899 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1900 if (!app->compatible) {
1901 /*
1902 * TODO: In time, we should notice the caller of this error by
1903 * telling him that this is a version error.
1904 */
1905 continue;
1906 }
78f0bacd
DG
1907 ua_sess = lookup_session_by_app(usess, app);
1908 if (ua_sess == NULL) {
1909 continue;
1910 }
1911
1912 /* Enable channel onto application */
1913 ret = enable_ust_app_channel(ua_sess, uchan, app);
1914 if (ret < 0) {
1915 /* XXX: We might want to report this error at some point... */
1916 continue;
1917 }
1918 }
1919
1920 rcu_read_unlock();
1921
1922error:
1923 return ret;
1924}
1925
b0a40d28
DG
1926/*
1927 * Disable an event in a channel and for a specific session.
1928 */
35a9059d
DG
1929int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1930 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
b0a40d28
DG
1931{
1932 int ret = 0;
bec39940
DG
1933 struct lttng_ht_iter iter, uiter;
1934 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
b0a40d28
DG
1935 struct ust_app *app;
1936 struct ust_app_session *ua_sess;
1937 struct ust_app_channel *ua_chan;
1938 struct ust_app_event *ua_event;
1939
1940 DBG("UST app disabling event %s for all apps in channel "
a991f516 1941 "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
b0a40d28
DG
1942
1943 rcu_read_lock();
1944
1945 /* For all registered applications */
852d0037 1946 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
1947 if (!app->compatible) {
1948 /*
1949 * TODO: In time, we should notice the caller of this error by
1950 * telling him that this is a version error.
1951 */
1952 continue;
1953 }
b0a40d28
DG
1954 ua_sess = lookup_session_by_app(usess, app);
1955 if (ua_sess == NULL) {
1956 /* Next app */
1957 continue;
1958 }
1959
1960 /* Lookup channel in the ust app session */
bec39940
DG
1961 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
1962 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28 1963 if (ua_chan_node == NULL) {
a991f516 1964 DBG2("Channel %s not found in session id %d for app pid %d."
852d0037 1965 "Skipping", uchan->name, usess->id, app->pid);
b0a40d28
DG
1966 continue;
1967 }
1968 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1969
bec39940
DG
1970 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &uiter);
1971 ua_event_node = lttng_ht_iter_get_node_str(&uiter);
b0a40d28
DG
1972 if (ua_event_node == NULL) {
1973 DBG2("Event %s not found in channel %s for app pid %d."
852d0037 1974 "Skipping", uevent->attr.name, uchan->name, app->pid);
b0a40d28
DG
1975 continue;
1976 }
1977 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1978
7f79d3a1 1979 ret = disable_ust_app_event(ua_sess, ua_event, app);
b0a40d28
DG
1980 if (ret < 0) {
1981 /* XXX: Report error someday... */
1982 continue;
1983 }
1984 }
1985
1986 rcu_read_unlock();
1987
1988 return ret;
1989}
1990
9730260e 1991/*
edb67388 1992 * For a specific UST session and UST channel, the event for all
9730260e
DG
1993 * registered apps.
1994 */
35a9059d 1995int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
9730260e
DG
1996 struct ltt_ust_channel *uchan)
1997{
1998 int ret = 0;
bec39940
DG
1999 struct lttng_ht_iter iter, uiter;
2000 struct lttng_ht_node_str *ua_chan_node;
9730260e
DG
2001 struct ust_app *app;
2002 struct ust_app_session *ua_sess;
2003 struct ust_app_channel *ua_chan;
2004 struct ust_app_event *ua_event;
2005
2006 DBG("UST app disabling all event for all apps in channel "
a991f516 2007 "%s for session id %d", uchan->name, usess->id);
9730260e
DG
2008
2009 rcu_read_lock();
2010
2011 /* For all registered applications */
852d0037 2012 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2013 if (!app->compatible) {
2014 /*
2015 * TODO: In time, we should notice the caller of this error by
2016 * telling him that this is a version error.
2017 */
2018 continue;
2019 }
9730260e 2020 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2021 if (!ua_sess) {
2022 /* The application has problem or is probably dead. */
2023 continue;
2024 }
9730260e
DG
2025
2026 /* Lookup channel in the ust app session */
bec39940
DG
2027 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2028 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2029 /* If the channel is not found, there is a code flow error */
2030 assert(ua_chan_node);
2031
9730260e
DG
2032 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2033
2034 /* Disable each events of channel */
bec39940
DG
2035 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2036 node.node) {
7f79d3a1 2037 ret = disable_ust_app_event(ua_sess, ua_event, app);
9730260e
DG
2038 if (ret < 0) {
2039 /* XXX: Report error someday... */
2040 continue;
2041 }
2042 }
2043 }
2044
2045 rcu_read_unlock();
2046
2047 return ret;
2048}
2049
421cb601 2050/*
5b4a0ec0 2051 * For a specific UST session, create the channel for all registered apps.
421cb601 2052 */
35a9059d 2053int ust_app_create_channel_glb(struct ltt_ust_session *usess,
48842b30
DG
2054 struct ltt_ust_channel *uchan)
2055{
3d8ca23b 2056 int ret = 0, created;
bec39940 2057 struct lttng_ht_iter iter;
48842b30 2058 struct ust_app *app;
3d8ca23b 2059 struct ust_app_session *ua_sess = NULL;
48842b30 2060
fc34caaa
DG
2061 /* Very wrong code flow */
2062 assert(usess);
2063 assert(uchan);
421cb601 2064
a991f516
MD
2065 DBG2("UST app adding channel %s to global domain for session id %d",
2066 uchan->name, usess->id);
48842b30
DG
2067
2068 rcu_read_lock();
421cb601 2069
5b4a0ec0 2070 /* For every registered applications */
852d0037 2071 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2072 if (!app->compatible) {
2073 /*
2074 * TODO: In time, we should notice the caller of this error by
2075 * telling him that this is a version error.
2076 */
2077 continue;
2078 }
edb67388
DG
2079 /*
2080 * Create session on the tracer side and add it to app session HT. Note
2081 * that if session exist, it will simply return a pointer to the ust
2082 * app session.
2083 */
3d8ca23b
DG
2084 ret = create_ust_app_session(usess, app, &ua_sess, &created);
2085 if (ret < 0) {
2086 switch (ret) {
2087 case -ENOTCONN:
2088 /*
2089 * The application's socket is not valid. Either a bad socket
2090 * or a timeout on it. We can't inform the caller that for a
2091 * specific app, the session failed so lets continue here.
2092 */
2093 continue;
2094 case -ENOMEM:
2095 default:
2096 goto error_rcu_unlock;
2097 }
48842b30 2098 }
3d8ca23b 2099 assert(ua_sess);
48842b30 2100
4d710ac2
DG
2101 /* Create channel onto application. We don't need the chan ref. */
2102 ret = create_ust_app_channel(ua_sess, uchan, app, NULL);
3d8ca23b
DG
2103 if (ret < 0) {
2104 if (ret == -ENOMEM) {
2105 /* No more memory is a fatal error. Stop right now. */
2106 goto error_rcu_unlock;
2107 }
2108 /* Cleanup the created session if it's the case. */
2109 if (created) {
2110 delete_ust_app_session(app->sock, ua_sess);
2111 }
48842b30 2112 }
48842b30 2113 }
5b4a0ec0 2114
95e047ff 2115error_rcu_unlock:
48842b30 2116 rcu_read_unlock();
3c14c33f 2117 return ret;
48842b30
DG
2118}
2119
5b4a0ec0 2120/*
edb67388 2121 * Enable event for a specific session and channel on the tracer.
5b4a0ec0 2122 */
35a9059d 2123int ust_app_enable_event_glb(struct ltt_ust_session *usess,
48842b30
DG
2124 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2125{
2126 int ret = 0;
bec39940 2127 struct lttng_ht_iter iter, uiter;
18eace3b 2128 struct lttng_ht_node_str *ua_chan_node;
48842b30
DG
2129 struct ust_app *app;
2130 struct ust_app_session *ua_sess;
2131 struct ust_app_channel *ua_chan;
2132 struct ust_app_event *ua_event;
48842b30 2133
a991f516
MD
2134 DBG("UST app enabling event %s for all apps for session id %d",
2135 uevent->attr.name, usess->id);
48842b30 2136
edb67388
DG
2137 /*
2138 * NOTE: At this point, this function is called only if the session and
2139 * channel passed are already created for all apps. and enabled on the
2140 * tracer also.
2141 */
2142
48842b30 2143 rcu_read_lock();
421cb601
DG
2144
2145 /* For all registered applications */
852d0037 2146 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2147 if (!app->compatible) {
2148 /*
2149 * TODO: In time, we should notice the caller of this error by
2150 * telling him that this is a version error.
2151 */
2152 continue;
2153 }
edb67388 2154 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2155 if (!ua_sess) {
2156 /* The application has problem or is probably dead. */
2157 continue;
2158 }
ba767faf 2159
edb67388 2160 /* Lookup channel in the ust app session */
bec39940
DG
2161 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2162 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2163 /* If the channel is not found, there is a code flow error */
2164 assert(ua_chan_node);
2165
2166 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2167
18eace3b
DG
2168 /* Get event node */
2169 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2170 uevent->filter, uevent->attr.loglevel);
2171 if (ua_event == NULL) {
7f79d3a1 2172 DBG3("UST app enable event %s not found for app PID %d."
852d0037 2173 "Skipping app", uevent->attr.name, app->pid);
35a9059d
DG
2174 continue;
2175 }
35a9059d
DG
2176
2177 ret = enable_ust_app_event(ua_sess, ua_event, app);
2178 if (ret < 0) {
7f79d3a1 2179 goto error;
48842b30 2180 }
edb67388
DG
2181 }
2182
7f79d3a1 2183error:
edb67388 2184 rcu_read_unlock();
edb67388
DG
2185 return ret;
2186}
2187
2188/*
2189 * For a specific existing UST session and UST channel, creates the event for
2190 * all registered apps.
2191 */
35a9059d 2192int ust_app_create_event_glb(struct ltt_ust_session *usess,
edb67388
DG
2193 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
2194{
2195 int ret = 0;
bec39940
DG
2196 struct lttng_ht_iter iter, uiter;
2197 struct lttng_ht_node_str *ua_chan_node;
edb67388
DG
2198 struct ust_app *app;
2199 struct ust_app_session *ua_sess;
2200 struct ust_app_channel *ua_chan;
2201
a991f516
MD
2202 DBG("UST app creating event %s for all apps for session id %d",
2203 uevent->attr.name, usess->id);
edb67388 2204
edb67388
DG
2205 rcu_read_lock();
2206
2207 /* For all registered applications */
852d0037 2208 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2209 if (!app->compatible) {
2210 /*
2211 * TODO: In time, we should notice the caller of this error by
2212 * telling him that this is a version error.
2213 */
2214 continue;
2215 }
edb67388 2216 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2217 if (!ua_sess) {
2218 /* The application has problem or is probably dead. */
2219 continue;
2220 }
48842b30
DG
2221
2222 /* Lookup channel in the ust app session */
bec39940
DG
2223 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2224 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
edb67388
DG
2225 /* If the channel is not found, there is a code flow error */
2226 assert(ua_chan_node);
2227
48842b30
DG
2228 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2229
edb67388
DG
2230 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2231 if (ret < 0) {
49c336c1 2232 if (ret != -LTTNG_UST_ERR_EXIST) {
fc34caaa
DG
2233 /* Possible value at this point: -ENOMEM. If so, we stop! */
2234 break;
2235 }
2236 DBG2("UST app event %s already exist on app PID %d",
852d0037 2237 uevent->attr.name, app->pid);
5b4a0ec0 2238 continue;
48842b30 2239 }
48842b30 2240 }
5b4a0ec0 2241
48842b30
DG
2242 rcu_read_unlock();
2243
2244 return ret;
2245}
2246
5b4a0ec0
DG
2247/*
2248 * Start tracing for a specific UST session and app.
2249 */
421cb601 2250int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
48842b30
DG
2251{
2252 int ret = 0;
bec39940 2253 struct lttng_ht_iter iter;
48842b30
DG
2254 struct ust_app_session *ua_sess;
2255 struct ust_app_channel *ua_chan;
5b4a0ec0 2256 struct ltt_ust_stream *ustream;
173af62f 2257 struct consumer_socket *socket;
48842b30 2258
852d0037 2259 DBG("Starting tracing for ust app pid %d", app->pid);
5cf5d0e7 2260
509cbaf8
MD
2261 rcu_read_lock();
2262
e0c7ec2b
DG
2263 if (!app->compatible) {
2264 goto end;
2265 }
2266
421cb601
DG
2267 ua_sess = lookup_session_by_app(usess, app);
2268 if (ua_sess == NULL) {
d42f20df
DG
2269 /* The session is in teardown process. Ignore and continue. */
2270 goto end;
421cb601 2271 }
48842b30 2272
aea829b3
DG
2273 /* Upon restart, we skip the setup, already done */
2274 if (ua_sess->started) {
8be98f9a 2275 goto skip_setup;
aea829b3 2276 }
8be98f9a 2277
a4b92340
DG
2278 /* Create directories if consumer is LOCAL and has a path defined. */
2279 if (usess->consumer->type == CONSUMER_DST_LOCAL &&
2280 strlen(usess->consumer->dst.trace_path) > 0) {
2281 ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path,
2282 S_IRWXU | S_IRWXG, usess->uid, usess->gid);
2283 if (ret < 0) {
2284 if (ret != -EEXIST) {
2285 ERR("Trace directory creation error");
2286 ret = -1;
2287 goto error_rcu_unlock;
2288 }
2289 }
2290 }
2291
421cb601
DG
2292 ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
2293 if (ret < 0) {
f73fabfd 2294 ret = LTTNG_ERR_UST_META_FAIL;
509cbaf8 2295 goto error_rcu_unlock;
421cb601 2296 }
48842b30 2297
421cb601 2298 /* For each channel */
bec39940
DG
2299 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2300 node.node) {
421cb601
DG
2301 /* Create all streams */
2302 while (1) {
5b4a0ec0 2303 /* Create UST stream */
421cb601
DG
2304 ustream = zmalloc(sizeof(*ustream));
2305 if (ustream == NULL) {
2306 PERROR("zmalloc ust stream");
509cbaf8 2307 goto error_rcu_unlock;
421cb601 2308 }
48842b30 2309
4063050c
MD
2310 /* We are going to receive 2 fds, we need to reserve them. */
2311 ret = lttng_fd_get(LTTNG_FD_APPS, 2);
2312 if (ret < 0) {
2313 ERR("Exhausted number of available FD upon stream create");
2314 free(ustream);
2315 goto error_rcu_unlock;
2316 }
86acf0da
DG
2317
2318 health_code_update(&health_thread_cmd);
2319
852d0037 2320 ret = ustctl_create_stream(app->sock, ua_chan->obj,
421cb601 2321 &ustream->obj);
48842b30 2322 if (ret < 0) {
5548a381 2323 /* Free unused memory and reset FD states. */
a2c0da86 2324 free(ustream);
5548a381
DG
2325 lttng_fd_put(LTTNG_FD_APPS, 2);
2326 if (ret == -ENOENT) {
2327 /* Got all streams. Continue normal execution. */
2328 break;
2329 }
2330 /* Error at this point. Stop everything. */
f73fabfd 2331 ret = LTTNG_ERR_UST_STREAM_FAIL;
5548a381 2332 goto error_rcu_unlock;
48842b30 2333 }
421cb601 2334 ustream->handle = ustream->obj->handle;
48842b30 2335
86acf0da
DG
2336 health_code_update(&health_thread_cmd);
2337
421cb601
DG
2338 /* Order is important */
2339 cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
00e2e675 2340 ret = snprintf(ustream->name, sizeof(ustream->name), "%s_%u",
c30aaa51
MD
2341 ua_chan->name, ua_chan->streams.count);
2342 ua_chan->streams.count++;
aba8e916
DG
2343 if (ret < 0) {
2344 PERROR("asprintf UST create stream");
a2c0da86
MD
2345 /*
2346 * XXX what should we do here with the
2347 * stream ?
2348 */
421cb601 2349 continue;
aba8e916 2350 }
00e2e675
DG
2351 DBG2("UST stream %d ready (handle: %d)", ua_chan->streams.count,
2352 ustream->handle);
421cb601 2353 }
86acf0da
DG
2354
2355 health_code_update(&health_thread_cmd);
421cb601 2356 }
aba8e916 2357
7753dea8
MD
2358 switch (app->bits_per_long) {
2359 case 64:
173af62f
DG
2360 socket = consumer_find_socket(uatomic_read(&ust_consumerd64_fd),
2361 usess->consumer);
2362 if (socket == NULL) {
2363 goto skip_setup;
2364 }
7753dea8
MD
2365 break;
2366 case 32:
173af62f
DG
2367 socket = consumer_find_socket(uatomic_read(&ust_consumerd32_fd),
2368 usess->consumer);
2369 if (socket == NULL) {
2370 goto skip_setup;
2371 }
7753dea8
MD
2372 break;
2373 default:
2374 ret = -EINVAL;
2375 goto error_rcu_unlock;
2376 }
aea829b3 2377
421cb601 2378 /* Setup UST consumer socket and send fds to it */
173af62f 2379 ret = ust_consumer_send_session(ua_sess, usess->consumer, socket);
421cb601 2380 if (ret < 0) {
509cbaf8 2381 goto error_rcu_unlock;
421cb601 2382 }
48842b30 2383
86acf0da
DG
2384 health_code_update(&health_thread_cmd);
2385
8be98f9a 2386skip_setup:
421cb601 2387 /* This start the UST tracing */
852d0037 2388 ret = ustctl_start_session(app->sock, ua_sess->handle);
421cb601 2389 if (ret < 0) {
5c3c99d7 2390 ERR("Error starting tracing for app pid: %d (ret: %d)", app->pid, ret);
509cbaf8 2391 goto error_rcu_unlock;
421cb601 2392 }
5b4a0ec0 2393
55c3953d
DG
2394 /* Indicate that the session has been started once */
2395 ua_sess->started = 1;
2396
86acf0da
DG
2397 health_code_update(&health_thread_cmd);
2398
421cb601 2399 /* Quiescent wait after starting trace */
852d0037 2400 ustctl_wait_quiescent(app->sock);
48842b30 2401
e0c7ec2b
DG
2402end:
2403 rcu_read_unlock();
86acf0da 2404 health_code_update(&health_thread_cmd);
421cb601 2405 return 0;
48842b30 2406
509cbaf8
MD
2407error_rcu_unlock:
2408 rcu_read_unlock();
86acf0da 2409 health_code_update(&health_thread_cmd);
421cb601
DG
2410 return -1;
2411}
48842b30 2412
8be98f9a
MD
2413/*
2414 * Stop tracing for a specific UST session and app.
2415 */
2416int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
2417{
2418 int ret = 0;
bec39940 2419 struct lttng_ht_iter iter;
8be98f9a 2420 struct ust_app_session *ua_sess;
6d3686da 2421 struct ust_app_channel *ua_chan;
8be98f9a 2422
852d0037 2423 DBG("Stopping tracing for ust app pid %d", app->pid);
8be98f9a
MD
2424
2425 rcu_read_lock();
2426
e0c7ec2b
DG
2427 if (!app->compatible) {
2428 goto end;
2429 }
2430
8be98f9a
MD
2431 ua_sess = lookup_session_by_app(usess, app);
2432 if (ua_sess == NULL) {
d42f20df 2433 goto end;
8be98f9a
MD
2434 }
2435
9bc07046
DG
2436 /*
2437 * If started = 0, it means that stop trace has been called for a session
c45536e1
DG
2438 * that was never started. It's possible since we can have a fail start
2439 * from either the application manager thread or the command thread. Simply
2440 * indicate that this is a stop error.
9bc07046 2441 */
f9dfc3d9 2442 if (!ua_sess->started) {
c45536e1
DG
2443 goto error_rcu_unlock;
2444 }
7db205b5 2445
86acf0da
DG
2446 health_code_update(&health_thread_cmd);
2447
9d6c7d3f 2448 /* This inhibits UST tracing */
852d0037 2449 ret = ustctl_stop_session(app->sock, ua_sess->handle);
9d6c7d3f 2450 if (ret < 0) {
5c3c99d7 2451 ERR("Error stopping tracing for app pid: %d (ret: %d)", app->pid, ret);
9d6c7d3f
DG
2452 goto error_rcu_unlock;
2453 }
2454
86acf0da
DG
2455 health_code_update(&health_thread_cmd);
2456
9d6c7d3f 2457 /* Quiescent wait after stopping trace */
852d0037 2458 ustctl_wait_quiescent(app->sock);
9d6c7d3f 2459
86acf0da
DG
2460 health_code_update(&health_thread_cmd);
2461
9d6c7d3f 2462 /* Flushing buffers */
bec39940
DG
2463 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2464 node.node) {
86acf0da 2465 health_code_update(&health_thread_cmd);
852d0037 2466 ret = ustctl_sock_flush_buffer(app->sock, ua_chan->obj);
8be98f9a 2467 if (ret < 0) {
7db205b5 2468 ERR("UST app PID %d channel %s flush failed with ret %d",
852d0037 2469 app->pid, ua_chan->name, ret);
6d3686da
DG
2470 /* Continuing flushing all buffers */
2471 continue;
8be98f9a
MD
2472 }
2473 }
8be98f9a 2474
86acf0da
DG
2475 health_code_update(&health_thread_cmd);
2476
90d97d10 2477 /* Flush all buffers before stopping */
852d0037 2478 ret = ustctl_sock_flush_buffer(app->sock, ua_sess->metadata->obj);
90d97d10 2479 if (ret < 0) {
852d0037 2480 ERR("UST app PID %d metadata flush failed with ret %d", app->pid,
7db205b5 2481 ret);
90d97d10
DG
2482 }
2483
7db205b5
DG
2484end:
2485 rcu_read_unlock();
86acf0da 2486 health_code_update(&health_thread_cmd);
8be98f9a
MD
2487 return 0;
2488
2489error_rcu_unlock:
2490 rcu_read_unlock();
86acf0da 2491 health_code_update(&health_thread_cmd);
8be98f9a
MD
2492 return -1;
2493}
2494
84cd17c6
MD
2495/*
2496 * Destroy a specific UST session in apps.
2497 */
3353de95 2498static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
84cd17c6
MD
2499{
2500 struct ust_app_session *ua_sess;
2501 struct lttng_ust_object_data obj;
bec39940
DG
2502 struct lttng_ht_iter iter;
2503 struct lttng_ht_node_ulong *node;
525b0740 2504 int ret;
84cd17c6 2505
852d0037 2506 DBG("Destroy tracing for ust app pid %d", app->pid);
84cd17c6
MD
2507
2508 rcu_read_lock();
2509
e0c7ec2b
DG
2510 if (!app->compatible) {
2511 goto end;
2512 }
2513
84cd17c6 2514 __lookup_session_by_app(usess, app, &iter);
bec39940 2515 node = lttng_ht_iter_get_node_ulong(&iter);
84cd17c6 2516 if (node == NULL) {
d42f20df
DG
2517 /* Session is being or is deleted. */
2518 goto end;
84cd17c6
MD
2519 }
2520 ua_sess = caa_container_of(node, struct ust_app_session, node);
bec39940 2521 ret = lttng_ht_del(app->sessions, &iter);
c4a1715b
DG
2522 if (ret) {
2523 /* Already scheduled for teardown. */
2524 goto end;
2525 }
2526
84cd17c6
MD
2527 obj.handle = ua_sess->handle;
2528 obj.shm_fd = -1;
2529 obj.wait_fd = -1;
2530 obj.memory_map_size = 0;
86acf0da 2531 health_code_update(&health_thread_cmd);
852d0037 2532 ustctl_release_object(app->sock, &obj);
84cd17c6 2533
86acf0da 2534 health_code_update(&health_thread_cmd);
852d0037 2535 delete_ust_app_session(app->sock, ua_sess);
7db205b5 2536
84cd17c6 2537 /* Quiescent wait after stopping trace */
852d0037 2538 ustctl_wait_quiescent(app->sock);
84cd17c6 2539
e0c7ec2b
DG
2540end:
2541 rcu_read_unlock();
86acf0da 2542 health_code_update(&health_thread_cmd);
84cd17c6 2543 return 0;
84cd17c6
MD
2544}
2545
5b4a0ec0
DG
2546/*
2547 * Start tracing for the UST session.
2548 */
421cb601
DG
2549int ust_app_start_trace_all(struct ltt_ust_session *usess)
2550{
2551 int ret = 0;
bec39940 2552 struct lttng_ht_iter iter;
421cb601 2553 struct ust_app *app;
48842b30 2554
421cb601
DG
2555 DBG("Starting all UST traces");
2556
2557 rcu_read_lock();
421cb601 2558
852d0037 2559 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
421cb601 2560 ret = ust_app_start_trace(usess, app);
48842b30 2561 if (ret < 0) {
5b4a0ec0
DG
2562 /* Continue to next apps even on error */
2563 continue;
48842b30 2564 }
48842b30 2565 }
5b4a0ec0 2566
48842b30
DG
2567 rcu_read_unlock();
2568
2569 return 0;
2570}
487cf67c 2571
8be98f9a
MD
2572/*
2573 * Start tracing for the UST session.
2574 */
2575int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2576{
2577 int ret = 0;
bec39940 2578 struct lttng_ht_iter iter;
8be98f9a
MD
2579 struct ust_app *app;
2580
2581 DBG("Stopping all UST traces");
2582
2583 rcu_read_lock();
2584
852d0037 2585 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
8be98f9a
MD
2586 ret = ust_app_stop_trace(usess, app);
2587 if (ret < 0) {
2588 /* Continue to next apps even on error */
2589 continue;
2590 }
2591 }
2592
2593 rcu_read_unlock();
2594
2595 return 0;
2596}
2597
84cd17c6
MD
2598/*
2599 * Destroy app UST session.
2600 */
2601int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2602{
2603 int ret = 0;
bec39940 2604 struct lttng_ht_iter iter;
84cd17c6
MD
2605 struct ust_app *app;
2606
2607 DBG("Destroy all UST traces");
2608
2609 rcu_read_lock();
2610
852d0037 2611 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
3353de95 2612 ret = destroy_trace(usess, app);
84cd17c6
MD
2613 if (ret < 0) {
2614 /* Continue to next apps even on error */
2615 continue;
2616 }
2617 }
2618
2619 rcu_read_unlock();
2620
2621 return 0;
2622}
2623
5b4a0ec0
DG
2624/*
2625 * Add channels/events from UST global domain to registered apps at sock.
2626 */
487cf67c
DG
2627void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2628{
55c54cce 2629 int ret = 0;
727d5404 2630 struct lttng_ht_iter iter, uiter, iter_ctx;
487cf67c 2631 struct ust_app *app;
3d8ca23b 2632 struct ust_app_session *ua_sess = NULL;
487cf67c
DG
2633 struct ust_app_channel *ua_chan;
2634 struct ust_app_event *ua_event;
727d5404 2635 struct ust_app_ctx *ua_ctx;
1f3580c7 2636
95e047ff 2637 assert(usess);
1f3580c7 2638
a991f516
MD
2639 DBG2("UST app global update for app sock %d for session id %d", sock,
2640 usess->id);
487cf67c 2641
284d8f55
DG
2642 rcu_read_lock();
2643
487cf67c
DG
2644 app = find_app_by_sock(sock);
2645 if (app == NULL) {
2646 ERR("Failed to update app sock %d", sock);
2647 goto error;
2648 }
2649
e0c7ec2b
DG
2650 if (!app->compatible) {
2651 goto error;
2652 }
2653
3d8ca23b
DG
2654 ret = create_ust_app_session(usess, app, &ua_sess, NULL);
2655 if (ret < 0) {
2656 /* Tracer is probably gone or ENOMEM. */
487cf67c
DG
2657 goto error;
2658 }
3d8ca23b 2659 assert(ua_sess);
487cf67c 2660
284d8f55
DG
2661 /*
2662 * We can iterate safely here over all UST app session sicne the create ust
2663 * app session above made a shadow copy of the UST global domain from the
2664 * ltt ust session.
2665 */
bec39940
DG
2666 cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan,
2667 node.node) {
284d8f55
DG
2668 ret = create_ust_channel(app, ua_sess, ua_chan);
2669 if (ret < 0) {
2670 /* FIXME: Should we quit here or continue... */
2671 continue;
487cf67c
DG
2672 }
2673
727d5404
DG
2674 cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter_ctx.iter, ua_ctx,
2675 node.node) {
2676 ret = create_ust_channel_context(ua_chan, ua_ctx, app);
2677 if (ret < 0) {
2678 /* FIXME: Should we quit here or continue... */
2679 continue;
2680 }
2681 }
2682
2683
284d8f55 2684 /* For each events */
bec39940
DG
2685 cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event,
2686 node.node) {
284d8f55
DG
2687 ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2688 if (ret < 0) {
2689 /* FIXME: Should we quit here or continue... */
2690 continue;
487cf67c 2691 }
36dc12cc 2692 }
487cf67c
DG
2693 }
2694
36dc12cc 2695 if (usess->start_trace) {
421cb601 2696 ret = ust_app_start_trace(usess, app);
36dc12cc 2697 if (ret < 0) {
36dc12cc
DG
2698 goto error;
2699 }
2700
852d0037 2701 DBG2("UST trace started for app pid %d", app->pid);
36dc12cc
DG
2702 }
2703
487cf67c
DG
2704error:
2705 rcu_read_unlock();
2706 return;
2707}
55cc08a6
DG
2708
2709/*
2710 * Add context to a specific channel for global UST domain.
2711 */
2712int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2713 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2714{
2715 int ret = 0;
bec39940
DG
2716 struct lttng_ht_node_str *ua_chan_node;
2717 struct lttng_ht_iter iter, uiter;
55cc08a6
DG
2718 struct ust_app_channel *ua_chan = NULL;
2719 struct ust_app_session *ua_sess;
2720 struct ust_app *app;
2721
2722 rcu_read_lock();
2723
852d0037 2724 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
e0c7ec2b
DG
2725 if (!app->compatible) {
2726 /*
2727 * TODO: In time, we should notice the caller of this error by
2728 * telling him that this is a version error.
2729 */
2730 continue;
2731 }
55cc08a6
DG
2732 ua_sess = lookup_session_by_app(usess, app);
2733 if (ua_sess == NULL) {
2734 continue;
2735 }
2736
2737 /* Lookup channel in the ust app session */
bec39940
DG
2738 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter);
2739 ua_chan_node = lttng_ht_iter_get_node_str(&uiter);
55cc08a6
DG
2740 if (ua_chan_node == NULL) {
2741 continue;
2742 }
2743 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2744 node);
2745
2746 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2747 if (ret < 0) {
2748 continue;
2749 }
2750 }
2751
55cc08a6
DG
2752 rcu_read_unlock();
2753 return ret;
2754}
2755
76d45b40
DG
2756/*
2757 * Enable event for a channel from a UST session for a specific PID.
2758 */
2759int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2760 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2761{
2762 int ret = 0;
bec39940 2763 struct lttng_ht_iter iter;
18eace3b 2764 struct lttng_ht_node_str *ua_chan_node;
76d45b40
DG
2765 struct ust_app *app;
2766 struct ust_app_session *ua_sess;
2767 struct ust_app_channel *ua_chan;
2768 struct ust_app_event *ua_event;
2769
2770 DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2771
2772 rcu_read_lock();
2773
2774 app = ust_app_find_by_pid(pid);
2775 if (app == NULL) {
2776 ERR("UST app enable event per PID %d not found", pid);
2777 ret = -1;
2778 goto error;
2779 }
2780
e0c7ec2b
DG
2781 if (!app->compatible) {
2782 ret = 0;
2783 goto error;
2784 }
2785
76d45b40 2786 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2787 if (!ua_sess) {
2788 /* The application has problem or is probably dead. */
2789 goto error;
2790 }
76d45b40
DG
2791
2792 /* Lookup channel in the ust app session */
bec39940
DG
2793 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2794 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
76d45b40
DG
2795 /* If the channel is not found, there is a code flow error */
2796 assert(ua_chan_node);
2797
2798 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2799
18eace3b
DG
2800 ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name,
2801 uevent->filter, uevent->attr.loglevel);
2802 if (ua_event == NULL) {
76d45b40
DG
2803 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2804 if (ret < 0) {
2805 goto error;
2806 }
2807 } else {
76d45b40
DG
2808 ret = enable_ust_app_event(ua_sess, ua_event, app);
2809 if (ret < 0) {
2810 goto error;
2811 }
2812 }
2813
2814error:
2815 rcu_read_unlock();
2816 return ret;
2817}
7f79d3a1
DG
2818
2819/*
2820 * Disable event for a channel from a UST session for a specific PID.
2821 */
2822int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2823 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2824{
2825 int ret = 0;
bec39940
DG
2826 struct lttng_ht_iter iter;
2827 struct lttng_ht_node_str *ua_chan_node, *ua_event_node;
7f79d3a1
DG
2828 struct ust_app *app;
2829 struct ust_app_session *ua_sess;
2830 struct ust_app_channel *ua_chan;
2831 struct ust_app_event *ua_event;
2832
2833 DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2834
2835 rcu_read_lock();
2836
2837 app = ust_app_find_by_pid(pid);
2838 if (app == NULL) {
2839 ERR("UST app disable event per PID %d not found", pid);
2840 ret = -1;
2841 goto error;
2842 }
2843
e0c7ec2b
DG
2844 if (!app->compatible) {
2845 ret = 0;
2846 goto error;
2847 }
2848
7f79d3a1 2849 ua_sess = lookup_session_by_app(usess, app);
c4a1715b
DG
2850 if (!ua_sess) {
2851 /* The application has problem or is probably dead. */
2852 goto error;
2853 }
7f79d3a1
DG
2854
2855 /* Lookup channel in the ust app session */
bec39940
DG
2856 lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter);
2857 ua_chan_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2858 if (ua_chan_node == NULL) {
2859 /* Channel does not exist, skip disabling */
2860 goto error;
2861 }
2862 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2863
bec39940
DG
2864 lttng_ht_lookup(ua_chan->events, (void *)uevent->attr.name, &iter);
2865 ua_event_node = lttng_ht_iter_get_node_str(&iter);
7f79d3a1
DG
2866 if (ua_event_node == NULL) {
2867 /* Event does not exist, skip disabling */
2868 goto error;
2869 }
2870 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2871
2872 ret = disable_ust_app_event(ua_sess, ua_event, app);
2873 if (ret < 0) {
2874 goto error;
2875 }
2876
2877error:
2878 rcu_read_unlock();
2879 return ret;
2880}
e0c7ec2b
DG
2881
2882/*
2883 * Validate version of UST apps and set the compatible bit.
2884 */
2885int ust_app_validate_version(int sock)
2886{
2887 int ret;
2888 struct ust_app *app;
2889
2890 rcu_read_lock();
2891
2892 app = find_app_by_sock(sock);
2893 assert(app);
2894
86acf0da
DG
2895 health_code_update(&health_thread_cmd);
2896
e0c7ec2b
DG
2897 ret = ustctl_tracer_version(sock, &app->version);
2898 if (ret < 0) {
2899 goto error;
2900 }
2901
2902 /* Validate version */
aee0cea0 2903 if (app->version.major != UST_APP_MAJOR_VERSION) {
e0c7ec2b
DG
2904 goto error;
2905 }
2906
68264071 2907 DBG2("UST app PID %d is compatible with internal major version %d "
aee0cea0 2908 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2909 UST_APP_MAJOR_VERSION);
2910 app->compatible = 1;
2911 rcu_read_unlock();
86acf0da 2912 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2913 return 0;
2914
2915error:
68264071 2916 DBG2("UST app PID %d is not compatible with internal major version %d "
aee0cea0 2917 "(supporting == %d)", app->pid, app->version.major,
e0c7ec2b
DG
2918 UST_APP_MAJOR_VERSION);
2919 app->compatible = 0;
2920 rcu_read_unlock();
86acf0da 2921 health_code_update(&health_thread_cmd);
e0c7ec2b
DG
2922 return -1;
2923}
4466912f
DG
2924
2925/*
2926 * Calibrate registered applications.
2927 */
2928int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
2929{
2930 int ret = 0;
2931 struct lttng_ht_iter iter;
2932 struct ust_app *app;
2933
2934 rcu_read_lock();
2935
852d0037 2936 cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) {
4466912f
DG
2937 if (!app->compatible) {
2938 /*
2939 * TODO: In time, we should notice the caller of this error by
2940 * telling him that this is a version error.
2941 */
2942 continue;
2943 }
2944
86acf0da
DG
2945 health_code_update(&health_thread_cmd);
2946
852d0037 2947 ret = ustctl_calibrate(app->sock, calibrate);
4466912f
DG
2948 if (ret < 0) {
2949 switch (ret) {
2950 case -ENOSYS:
2951 /* Means that it's not implemented on the tracer side. */
2952 ret = 0;
2953 break;
2954 default:
2955 /* TODO: Report error to user */
2956 DBG2("Calibrate app PID %d returned with error %d",
852d0037 2957 app->pid, ret);
4466912f
DG
2958 break;
2959 }
2960 }
2961 }
2962
2963 DBG("UST app global domain calibration finished");
2964
2965 rcu_read_unlock();
2966
86acf0da
DG
2967 health_code_update(&health_thread_cmd);
2968
4466912f
DG
2969 return ret;
2970}
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