Commit | Line | Data |
---|---|---|
8020ceb5 MD |
1 | /* |
2 | * ltt-events.c | |
3 | * | |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
1f18504e | 48 | #include "error.h" |
08114193 | 49 | #include "compat.h" |
eda498b8 | 50 | #include "lttng-ust-uuid.h" |
44c72f10 | 51 | |
457a6b58 | 52 | #include "tracepoint-internal.h" |
8020ceb5 | 53 | #include "ltt-tracer.h" |
8165c8da | 54 | #include "ltt-tracer-core.h" |
b728d87e | 55 | #include "wait.h" |
8d8a24c8 | 56 | #include "../libringbuffer/shm.h" |
596c4223 | 57 | #include "jhash.h" |
8165c8da MD |
58 | |
59 | /* | |
60 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
61 | * control and probe registration. All operations within this file are |
62 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 63 | */ |
2b2d6ff7 | 64 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 65 | |
17dfb34b | 66 | void ust_lock(void) |
8165c8da MD |
67 | { |
68 | pthread_mutex_lock(&sessions_mutex); | |
69 | } | |
70 | ||
17dfb34b | 71 | void ust_unlock(void) |
8165c8da MD |
72 | { |
73 | pthread_mutex_unlock(&sessions_mutex); | |
74 | } | |
75 | ||
b5234c06 | 76 | static CDS_LIST_HEAD(sessions); |
8165c8da | 77 | |
457a6b58 MD |
78 | /* |
79 | * Wildcard list, containing the active wildcards. | |
80 | * Protected by ust lock. | |
81 | */ | |
82 | static CDS_LIST_HEAD(wildcard_list); | |
83 | ||
8165c8da MD |
84 | /* |
85 | * Pending probes hash table, containing the registered ltt events for | |
86 | * which tracepoint probes are still missing. Protected by the sessions | |
87 | * mutex. | |
88 | */ | |
89 | #define PENDING_PROBE_HASH_BITS 6 | |
90 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
91 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
92 | ||
93 | struct ust_pending_probe { | |
94 | struct ltt_event *event; | |
95 | struct cds_hlist_node node; | |
457a6b58 MD |
96 | enum lttng_ust_loglevel_type loglevel_type; |
97 | int loglevel; | |
8165c8da MD |
98 | char name[]; |
99 | }; | |
8020ceb5 | 100 | |
4e776b26 MD |
101 | /* |
102 | * Callsite hash table, containing the registered callsites. | |
103 | * Protected by the sessions mutex. | |
104 | */ | |
105 | #define CALLSITE_HASH_BITS 6 | |
106 | #define CALLSITE_HASH_SIZE (1 << CALLSITE_HASH_BITS) | |
107 | static struct cds_hlist_head callsite_table[CALLSITE_HASH_SIZE]; | |
108 | ||
8020ceb5 | 109 | static void _ltt_event_destroy(struct ltt_event *event); |
e6c12e3d | 110 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
111 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
112 | static int _ltt_event_unregister(struct ltt_event *event); | |
113 | static | |
114 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
115 | struct ltt_channel *chan, | |
116 | struct ltt_event *event); | |
117 | static | |
4e776b26 MD |
118 | int _ltt_callsite_metadata_statedump(struct ltt_session *session, |
119 | struct lttng_callsite *callsite); | |
120 | ||
121 | static | |
8020ceb5 MD |
122 | int _ltt_session_metadata_statedump(struct ltt_session *session); |
123 | ||
457a6b58 MD |
124 | int ltt_loglevel_match(const struct lttng_event_desc *desc, |
125 | enum lttng_ust_loglevel_type req_type, | |
126 | int req_loglevel) | |
127 | { | |
128 | int ev_loglevel; | |
129 | ||
130 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) | |
131 | return 1; | |
132 | if (!desc->loglevel) | |
133 | ev_loglevel = TRACE_DEFAULT; | |
134 | else | |
135 | ev_loglevel = *(*desc->loglevel); | |
136 | switch (req_type) { | |
137 | case LTTNG_UST_LOGLEVEL_RANGE: | |
138 | if (ev_loglevel <= req_loglevel || req_loglevel == -1) | |
139 | return 1; | |
140 | else | |
141 | return 0; | |
142 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
143 | if (ev_loglevel == req_loglevel || req_loglevel == -1) | |
144 | return 1; | |
145 | else | |
146 | return 0; | |
147 | case LTTNG_UST_LOGLEVEL_ALL: | |
148 | default: | |
149 | return 1; | |
150 | } | |
151 | } | |
152 | ||
153 | /* | |
154 | * Return wildcard for a given event name if the event name match the | |
155 | * one of the wildcards. | |
156 | * Must be called with ust lock held. | |
157 | * Returns NULL if not present. | |
158 | */ | |
159 | static | |
160 | struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc) | |
161 | { | |
162 | struct wildcard_entry *e; | |
163 | ||
164 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
165 | /* If only contain '*' */ | |
166 | if (strlen(e->name) == 1) | |
167 | goto possible_match; | |
168 | /* Compare excluding final '*' */ | |
169 | if (!strncmp(desc->name, e->name, strlen(e->name) - 1)) | |
170 | goto possible_match; | |
171 | continue; /* goto next, no match */ | |
172 | possible_match: | |
173 | if (ltt_loglevel_match(desc, | |
174 | e->loglevel_type, | |
175 | e->loglevel)) { | |
176 | return e; | |
177 | } | |
178 | /* no match, loop to next */ | |
179 | } | |
180 | return NULL; | |
181 | } | |
182 | ||
8165c8da MD |
183 | /* |
184 | * called at event creation if probe is missing. | |
185 | * called with session mutex held. | |
186 | */ | |
187 | static | |
457a6b58 MD |
188 | int add_pending_probe(struct ltt_event *event, const char *name, |
189 | enum lttng_ust_loglevel_type loglevel_type, | |
190 | int loglevel) | |
8165c8da MD |
191 | { |
192 | struct cds_hlist_head *head; | |
8165c8da | 193 | struct ust_pending_probe *e; |
48bf7c27 | 194 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 195 | uint32_t hash; |
8165c8da | 196 | |
48bf7c27 MD |
197 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
198 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
199 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 200 | } |
48bf7c27 | 201 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
202 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
203 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
204 | if (!e) | |
205 | return -ENOMEM; | |
48bf7c27 MD |
206 | memcpy(&e->name[0], name, name_len); |
207 | e->name[name_len - 1] = '\0'; | |
457a6b58 MD |
208 | e->loglevel_type = loglevel_type; |
209 | e->loglevel = loglevel; | |
8165c8da MD |
210 | cds_hlist_add_head(&e->node, head); |
211 | e->event = event; | |
212 | event->pending_probe = e; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * remove a pending probe. called when at event teardown and when an | |
218 | * event is fixed (probe is loaded). | |
219 | * called with session mutex held. | |
220 | */ | |
221 | static | |
222 | void remove_pending_probe(struct ust_pending_probe *e) | |
223 | { | |
224 | if (!e) | |
225 | return; | |
226 | cds_hlist_del(&e->node); | |
227 | free(e); | |
228 | } | |
229 | ||
230 | /* | |
231 | * Called at library load: connect the probe on the events pending on | |
232 | * probe load. | |
233 | * called with session mutex held. | |
234 | */ | |
235 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
236 | { | |
237 | struct cds_hlist_head *head; | |
238 | struct cds_hlist_node *node, *p; | |
239 | struct ust_pending_probe *e; | |
240 | const char *name = desc->name; | |
8165c8da | 241 | int ret = 0; |
7ee3cc56 | 242 | struct lttng_ust_event event_param; |
48bf7c27 | 243 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 244 | uint32_t hash; |
8165c8da | 245 | |
e6c12e3d MD |
246 | /* Wildcard */ |
247 | { | |
248 | struct wildcard_entry *wildcard; | |
249 | ||
457a6b58 | 250 | wildcard = match_wildcard(desc); |
e6c12e3d MD |
251 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { |
252 | struct session_wildcard *sw; | |
253 | ||
254 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
255 | session_list) { | |
256 | struct ltt_event *ev; | |
257 | int ret; | |
258 | ||
259 | memcpy(&event_param, &sw->event_param, | |
260 | sizeof(event_param)); | |
261 | memcpy(event_param.name, | |
262 | desc->name, | |
263 | sizeof(event_param.name)); | |
264 | /* create event */ | |
265 | ret = ltt_event_create(sw->chan, | |
2d78951a | 266 | &event_param, &ev); |
e6c12e3d MD |
267 | if (ret) { |
268 | DBG("Error creating event"); | |
269 | continue; | |
270 | } | |
271 | cds_list_add(&ev->wildcard_list, | |
272 | &sw->events); | |
2d78951a MD |
273 | lttng_filter_event_link_bytecode(ev, |
274 | sw->filter_bytecode); | |
e6c12e3d MD |
275 | } |
276 | } | |
277 | } | |
278 | ||
48bf7c27 MD |
279 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
280 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
281 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 282 | } |
48bf7c27 | 283 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
284 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
285 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
286 | struct ltt_event *event; | |
287 | struct ltt_channel *chan; | |
288 | ||
fe2d02f4 | 289 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
290 | e->loglevel_type, |
291 | e->loglevel)) { | |
292 | continue; | |
293 | } | |
294 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
295 | continue; | |
296 | } | |
fe2d02f4 | 297 | event = e->event; |
8165c8da MD |
298 | chan = event->chan; |
299 | assert(!event->desc); | |
300 | event->desc = desc; | |
301 | event->pending_probe = NULL; | |
302 | remove_pending_probe(e); | |
303 | ret |= __tracepoint_probe_register(name, | |
304 | event->desc->probe_callback, | |
67e5f391 | 305 | event, event->desc->signature); |
636c5aa4 MD |
306 | if (ret) |
307 | continue; | |
308 | event->id = chan->free_event_id++; | |
8165c8da MD |
309 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
310 | event); | |
cd54f6d9 MD |
311 | lttng_filter_event_link_bytecode(event, |
312 | event->filter_bytecode); | |
8165c8da MD |
313 | } |
314 | return ret; | |
315 | } | |
316 | ||
4e776b26 MD |
317 | /* |
318 | * Called at library load: add callsite information. | |
319 | * Takes the session mutex. | |
320 | * Should _not_ be called with tracepoint mutex held (would cause | |
321 | * deadlock with session mutex). | |
322 | */ | |
323 | int lttng_callsite_add(const struct tracepoint_callsite *tp_cs) | |
324 | { | |
325 | struct cds_hlist_head *head; | |
326 | struct lttng_callsite *cs_node; | |
327 | struct ltt_session *session; | |
328 | uint32_t hash; | |
329 | int ret; | |
330 | ||
331 | ust_lock(); | |
332 | /* hash by pointer value */ | |
333 | hash = jhash(&tp_cs, sizeof(tp_cs), 0); | |
334 | head = &callsite_table[hash & (CALLSITE_HASH_SIZE - 1)]; | |
335 | cs_node = zmalloc(sizeof(struct lttng_callsite)); | |
336 | if (!cs_node) | |
337 | goto error_mem; | |
338 | cds_hlist_add_head(&cs_node->node, head); | |
339 | cs_node->tp_cs = tp_cs; | |
340 | ||
341 | /* print metadata for each session */ | |
342 | cds_list_for_each_entry(session, &sessions, list) { | |
343 | ret = _ltt_callsite_metadata_statedump(session, cs_node); | |
344 | assert(!ret); | |
345 | } | |
346 | ust_unlock(); | |
347 | return 0; | |
348 | ||
349 | error_mem: | |
350 | ust_unlock(); | |
351 | return -ENOMEM; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Called at library unload: remove callsite information. | |
356 | * Takes the session mutex. | |
357 | * Should _not_ be called with tracepoint mutex held (would cause | |
358 | * deadlock with session mutex). | |
359 | */ | |
360 | int lttng_callsite_remove(const struct tracepoint_callsite *tp_cs) | |
361 | { | |
362 | struct cds_hlist_head *head; | |
363 | struct cds_hlist_node *node; | |
364 | struct lttng_callsite *cs_node; | |
365 | uint32_t hash; | |
366 | int found = 0; | |
367 | ||
368 | ust_lock(); | |
369 | /* hash by pointer value */ | |
370 | hash = jhash(&tp_cs, sizeof(tp_cs), 0); | |
371 | head = &callsite_table[hash & (CALLSITE_HASH_SIZE - 1)]; | |
372 | cds_hlist_for_each_entry(cs_node, node, head, node) { | |
373 | if (cs_node->tp_cs == tp_cs) { | |
374 | found = 1; | |
375 | break; | |
376 | } | |
377 | } | |
378 | if (!found) | |
379 | goto error; | |
380 | cds_hlist_del(&cs_node->node); | |
381 | free(cs_node); | |
382 | ust_unlock(); | |
383 | return 0; | |
384 | ||
385 | error: | |
386 | ust_unlock(); | |
387 | return -ENOENT; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Called with ust mutex held. | |
392 | */ | |
393 | static | |
394 | int _callsite_session_metadata_statedump(struct ltt_session *session) | |
395 | { | |
396 | int ret = 0; | |
397 | unsigned int i; | |
398 | ||
399 | for (i = 0; i < CALLSITE_HASH_SIZE; i++) { | |
400 | struct cds_hlist_head *head; | |
401 | struct cds_hlist_node *node; | |
402 | struct lttng_callsite *cs_node; | |
403 | ||
404 | head = &callsite_table[i]; | |
405 | cds_hlist_for_each_entry(cs_node, node, head, node) { | |
406 | ret = _ltt_callsite_metadata_statedump(session, | |
407 | cs_node); | |
408 | if (ret) | |
409 | return ret; | |
410 | } | |
411 | } | |
412 | return ret; | |
413 | } | |
414 | ||
8020ceb5 MD |
415 | void synchronize_trace(void) |
416 | { | |
8020ceb5 | 417 | synchronize_rcu(); |
8020ceb5 MD |
418 | } |
419 | ||
420 | struct ltt_session *ltt_session_create(void) | |
421 | { | |
422 | struct ltt_session *session; | |
19d8b1b3 | 423 | int ret; |
8020ceb5 | 424 | |
b5234c06 | 425 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
426 | if (!session) |
427 | return NULL; | |
b5234c06 MD |
428 | CDS_INIT_LIST_HEAD(&session->chan); |
429 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 430 | CDS_INIT_LIST_HEAD(&session->wildcards); |
19d8b1b3 MD |
431 | ret = lttng_ust_uuid_generate(session->uuid); |
432 | if (ret != 0) { | |
433 | session->uuid[0] = '\0'; | |
434 | } | |
b5234c06 | 435 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
436 | return session; |
437 | } | |
438 | ||
439 | void ltt_session_destroy(struct ltt_session *session) | |
440 | { | |
441 | struct ltt_channel *chan, *tmpchan; | |
442 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 443 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
444 | int ret; |
445 | ||
b5234c06 MD |
446 | CMM_ACCESS_ONCE(session->active) = 0; |
447 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
448 | ret = _ltt_event_unregister(event); |
449 | WARN_ON(ret); | |
450 | } | |
451 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
452 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
453 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 454 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 455 | _ltt_event_destroy(event); |
b5234c06 | 456 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 457 | _ltt_channel_destroy(chan); |
b5234c06 | 458 | cds_list_del(&session->list); |
b5234c06 | 459 | free(session); |
8020ceb5 MD |
460 | } |
461 | ||
976fe9ea | 462 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
463 | { |
464 | int ret = 0; | |
465 | struct ltt_channel *chan; | |
466 | ||
8020ceb5 MD |
467 | if (session->active) { |
468 | ret = -EBUSY; | |
469 | goto end; | |
470 | } | |
471 | ||
472 | /* | |
473 | * Snapshot the number of events per channel to know the type of header | |
474 | * we need to use. | |
475 | */ | |
b5234c06 | 476 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
477 | if (chan->header_type) |
478 | continue; /* don't change it if session stop/restart */ | |
479 | if (chan->free_event_id < 31) | |
480 | chan->header_type = 1; /* compact */ | |
481 | else | |
482 | chan->header_type = 2; /* large */ | |
483 | } | |
484 | ||
b5234c06 MD |
485 | CMM_ACCESS_ONCE(session->active) = 1; |
486 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 487 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 488 | if (ret) |
b5234c06 | 489 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 490 | end: |
8020ceb5 MD |
491 | return ret; |
492 | } | |
493 | ||
976fe9ea | 494 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
495 | { |
496 | int ret = 0; | |
497 | ||
8020ceb5 MD |
498 | if (!session->active) { |
499 | ret = -EBUSY; | |
500 | goto end; | |
501 | } | |
b5234c06 | 502 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 503 | end: |
8020ceb5 MD |
504 | return ret; |
505 | } | |
506 | ||
976fe9ea MD |
507 | int ltt_channel_enable(struct ltt_channel *channel) |
508 | { | |
509 | int old; | |
510 | ||
9beb36ba MD |
511 | if (channel == channel->session->metadata) |
512 | return -EPERM; | |
b5234c06 | 513 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
514 | if (old) |
515 | return -EEXIST; | |
516 | return 0; | |
517 | } | |
518 | ||
519 | int ltt_channel_disable(struct ltt_channel *channel) | |
520 | { | |
521 | int old; | |
522 | ||
9beb36ba MD |
523 | if (channel == channel->session->metadata) |
524 | return -EPERM; | |
b5234c06 | 525 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
526 | if (!old) |
527 | return -EEXIST; | |
528 | return 0; | |
529 | } | |
530 | ||
531 | int ltt_event_enable(struct ltt_event *event) | |
532 | { | |
533 | int old; | |
534 | ||
9beb36ba MD |
535 | if (event->chan == event->chan->session->metadata) |
536 | return -EPERM; | |
b5234c06 | 537 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
538 | if (old) |
539 | return -EEXIST; | |
540 | return 0; | |
541 | } | |
542 | ||
543 | int ltt_event_disable(struct ltt_event *event) | |
544 | { | |
545 | int old; | |
546 | ||
9beb36ba MD |
547 | if (event->chan == event->chan->session->metadata) |
548 | return -EPERM; | |
b5234c06 | 549 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
550 | if (!old) |
551 | return -EEXIST; | |
552 | return 0; | |
553 | } | |
554 | ||
8020ceb5 MD |
555 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
556 | const char *transport_name, | |
557 | void *buf_addr, | |
558 | size_t subbuf_size, size_t num_subbuf, | |
559 | unsigned int switch_timer_interval, | |
193183fb | 560 | unsigned int read_timer_interval, |
ef9ff354 MD |
561 | int **shm_fd, int **wait_fd, |
562 | uint64_t **memory_map_size, | |
d028eddb | 563 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 564 | { |
a3f61e7f | 565 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
566 | struct ltt_transport *transport; |
567 | ||
8020ceb5 MD |
568 | if (session->been_active) |
569 | goto active; /* Refuse to add channel to active session */ | |
570 | transport = ltt_transport_find(transport_name); | |
571 | if (!transport) { | |
b5234c06 | 572 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
573 | transport_name); |
574 | goto notransport; | |
575 | } | |
d028eddb MD |
576 | chan_priv_init->id = session->free_chan_id++; |
577 | chan_priv_init->session = session; | |
8020ceb5 MD |
578 | /* |
579 | * Note: the channel creation op already writes into the packet | |
580 | * headers. Therefore the "chan" information used as input | |
581 | * should be already accessible. | |
582 | */ | |
e7372d13 | 583 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 584 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 585 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 586 | memory_map_size, chan_priv_init); |
a3f61e7f | 587 | if (!chan) |
8020ceb5 | 588 | goto create_error; |
976fe9ea | 589 | chan->enabled = 1; |
8020ceb5 | 590 | chan->ops = &transport->ops; |
b5234c06 | 591 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
592 | return chan; |
593 | ||
594 | create_error: | |
8020ceb5 MD |
595 | notransport: |
596 | active: | |
8020ceb5 MD |
597 | return NULL; |
598 | } | |
599 | ||
600 | /* | |
601 | * Only used internally at session destruction. | |
602 | */ | |
603 | static | |
604 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
605 | { | |
b5234c06 | 606 | cds_list_del(&chan->list); |
8020ceb5 | 607 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 608 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
609 | } |
610 | ||
611 | /* | |
612 | * Supports event creation while tracing session is active. | |
613 | */ | |
576599a0 MD |
614 | int ltt_event_create(struct ltt_channel *chan, |
615 | struct lttng_ust_event *event_param, | |
576599a0 | 616 | struct ltt_event **_event) |
8020ceb5 | 617 | { |
457a6b58 | 618 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 619 | struct ltt_event *event; |
576599a0 | 620 | int ret = 0; |
8020ceb5 | 621 | |
38eb0baa | 622 | if (chan->used_event_id == -1U) { |
576599a0 | 623 | ret = -ENOMEM; |
8020ceb5 | 624 | goto full; |
576599a0 | 625 | } |
8020ceb5 MD |
626 | /* |
627 | * This is O(n^2) (for each event, the loop is called at event | |
628 | * creation). Might require a hash if we have lots of events. | |
629 | */ | |
576599a0 | 630 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
631 | if (event->desc && !strncmp(event->desc->name, |
632 | event_param->name, | |
633 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 634 | ret = -EEXIST; |
8020ceb5 | 635 | goto exist; |
576599a0 MD |
636 | } |
637 | } | |
457a6b58 MD |
638 | |
639 | /* | |
640 | * Check if loglevel match. Refuse to connect event if not. | |
641 | */ | |
642 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
643 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
644 | if (desc) { |
645 | if (!ltt_loglevel_match(desc, | |
646 | event_param->loglevel_type, | |
647 | event_param->loglevel)) { | |
648 | ret = -EPERM; | |
649 | goto no_loglevel_match; | |
650 | } | |
457a6b58 | 651 | } |
fe2d02f4 MD |
652 | /* |
653 | * If descriptor is not there, it will be added to | |
654 | * pending probes. | |
655 | */ | |
457a6b58 | 656 | } |
b5234c06 | 657 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
658 | if (!event) { |
659 | ret = -ENOMEM; | |
8020ceb5 | 660 | goto cache_error; |
576599a0 | 661 | } |
8020ceb5 | 662 | event->chan = chan; |
8165c8da MD |
663 | /* |
664 | * used_event_id counts the maximum number of event IDs that can | |
665 | * register if all probes register. | |
666 | */ | |
667 | chan->used_event_id++; | |
976fe9ea | 668 | event->enabled = 1; |
8020ceb5 MD |
669 | event->instrumentation = event_param->instrumentation; |
670 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 671 | cmm_smp_wmb(); |
8020ceb5 | 672 | switch (event_param->instrumentation) { |
b5234c06 | 673 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 674 | event->desc = desc; |
8165c8da MD |
675 | if (event->desc) { |
676 | ret = __tracepoint_probe_register(event_param->name, | |
677 | event->desc->probe_callback, | |
67e5f391 | 678 | event, event->desc->signature); |
8165c8da MD |
679 | if (ret) |
680 | goto register_error; | |
681 | event->id = chan->free_event_id++; | |
682 | } else { | |
683 | /* | |
684 | * If the probe is not present, event->desc stays NULL, | |
685 | * waiting for the probe to register, and the event->id | |
686 | * stays unallocated. | |
687 | */ | |
457a6b58 MD |
688 | ret = add_pending_probe(event, event_param->name, |
689 | event_param->loglevel_type, | |
690 | event_param->loglevel); | |
8165c8da MD |
691 | if (ret) |
692 | goto add_pending_error; | |
693 | } | |
8020ceb5 | 694 | break; |
8020ceb5 MD |
695 | default: |
696 | WARN_ON_ONCE(1); | |
697 | } | |
8165c8da MD |
698 | if (event->desc) { |
699 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
700 | if (ret) | |
701 | goto statedump_error; | |
702 | } | |
b5234c06 | 703 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
704 | *_event = event; |
705 | return 0; | |
8020ceb5 MD |
706 | |
707 | statedump_error: | |
8165c8da MD |
708 | if (event->desc) { |
709 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
710 | event->desc->probe_callback, | |
711 | event)); | |
712 | ltt_event_put(event->desc); | |
713 | } | |
714 | add_pending_error: | |
8020ceb5 | 715 | register_error: |
b5234c06 | 716 | free(event); |
8020ceb5 | 717 | cache_error: |
457a6b58 | 718 | no_loglevel_match: |
8020ceb5 MD |
719 | exist: |
720 | full: | |
576599a0 | 721 | return ret; |
8020ceb5 MD |
722 | } |
723 | ||
724 | /* | |
725 | * Only used internally at session destruction. | |
726 | */ | |
727 | int _ltt_event_unregister(struct ltt_event *event) | |
728 | { | |
729 | int ret = -EINVAL; | |
730 | ||
731 | switch (event->instrumentation) { | |
b5234c06 | 732 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
733 | if (event->desc) { |
734 | ret = __tracepoint_probe_unregister(event->desc->name, | |
735 | event->desc->probe_callback, | |
736 | event); | |
737 | if (ret) | |
738 | return ret; | |
739 | } else { | |
740 | remove_pending_probe(event->pending_probe); | |
741 | ret = 0; | |
742 | } | |
8020ceb5 | 743 | break; |
8020ceb5 MD |
744 | default: |
745 | WARN_ON_ONCE(1); | |
746 | } | |
747 | return ret; | |
748 | } | |
749 | ||
750 | /* | |
751 | * Only used internally at session destruction. | |
752 | */ | |
753 | static | |
754 | void _ltt_event_destroy(struct ltt_event *event) | |
755 | { | |
756 | switch (event->instrumentation) { | |
b5234c06 | 757 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
758 | if (event->desc) { |
759 | ltt_event_put(event->desc); | |
760 | } | |
8020ceb5 | 761 | break; |
8020ceb5 MD |
762 | default: |
763 | WARN_ON_ONCE(1); | |
764 | } | |
b5234c06 | 765 | cds_list_del(&event->list); |
8020ceb5 | 766 | lttng_destroy_context(event->ctx); |
2d78951a MD |
767 | free(event->filter_bytecode); |
768 | free(event->filter_data); | |
b5234c06 | 769 | free(event); |
8020ceb5 MD |
770 | } |
771 | ||
772 | /* | |
773 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 774 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
775 | * remaining space left in packet and write, since mutual exclusion |
776 | * protects us from concurrent writes. | |
777 | */ | |
778 | int lttng_metadata_printf(struct ltt_session *session, | |
779 | const char *fmt, ...) | |
780 | { | |
4cfec15c | 781 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 782 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 783 | char *str = NULL; |
8020ceb5 MD |
784 | int ret = 0, waitret; |
785 | size_t len, reserve_len, pos; | |
786 | va_list ap; | |
787 | ||
b5234c06 | 788 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
789 | |
790 | va_start(ap, fmt); | |
b5234c06 | 791 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 792 | va_end(ap); |
b5234c06 | 793 | if (ret < 0) |
8020ceb5 MD |
794 | return -ENOMEM; |
795 | ||
796 | len = strlen(str); | |
797 | pos = 0; | |
798 | ||
799 | for (pos = 0; pos < len; pos += reserve_len) { | |
800 | reserve_len = min_t(size_t, | |
1d498196 | 801 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
802 | len - pos); |
803 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 804 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
805 | /* |
806 | * We don't care about metadata buffer's records lost | |
807 | * count, because we always retry here. Report error if | |
808 | * we need to bail out after timeout or being | |
809 | * interrupted. | |
810 | */ | |
b5234c06 | 811 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
812 | ({ |
813 | ret = chan->ops->event_reserve(&ctx, 0); | |
814 | ret != -ENOBUFS || !ret; | |
815 | }), | |
b5234c06 | 816 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 817 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
818 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
819 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 820 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 821 | if (waitret == -EINTR) |
8020ceb5 MD |
822 | ret = waitret; |
823 | goto end; | |
824 | } | |
825 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
826 | chan->ops->event_commit(&ctx); | |
827 | } | |
828 | end: | |
b5234c06 | 829 | free(str); |
8020ceb5 MD |
830 | return ret; |
831 | } | |
832 | ||
833 | static | |
834 | int _ltt_field_statedump(struct ltt_session *session, | |
835 | const struct lttng_event_field *field) | |
836 | { | |
837 | int ret = 0; | |
838 | ||
180901e6 | 839 | if (field->nowrite) |
4774c8f3 MD |
840 | return 0; |
841 | ||
8020ceb5 MD |
842 | switch (field->type.atype) { |
843 | case atype_integer: | |
844 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 845 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
846 | field->type.u.basic.integer.size, |
847 | field->type.u.basic.integer.alignment, | |
848 | field->type.u.basic.integer.signedness, | |
849 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
850 | ? "none" | |
851 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
852 | ? "UTF8" | |
853 | : "ASCII", | |
854 | field->type.u.basic.integer.base, | |
8a98a75d | 855 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
856 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
857 | #else | |
858 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
859 | #endif | |
860 | field->name); | |
861 | break; | |
862 | case atype_float: | |
863 | ret = lttng_metadata_printf(session, | |
8a98a75d | 864 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
865 | field->type.u.basic._float.exp_dig, |
866 | field->type.u.basic._float.mant_dig, | |
867 | field->type.u.basic._float.alignment, | |
8a98a75d | 868 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
869 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
870 | #else | |
871 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
872 | #endif | |
873 | field->name); | |
874 | break; | |
875 | case atype_enum: | |
876 | ret = lttng_metadata_printf(session, | |
877 | " %s %s;\n", | |
878 | field->type.u.basic.enumeration.name, | |
879 | field->name); | |
880 | break; | |
881 | case atype_array: | |
882 | { | |
883 | const struct lttng_basic_type *elem_type; | |
884 | ||
885 | elem_type = &field->type.u.array.elem_type; | |
886 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 887 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
888 | elem_type->u.basic.integer.size, |
889 | elem_type->u.basic.integer.alignment, | |
890 | elem_type->u.basic.integer.signedness, | |
891 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
892 | ? "none" | |
893 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
894 | ? "UTF8" | |
895 | : "ASCII", | |
896 | elem_type->u.basic.integer.base, | |
8a98a75d | 897 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
898 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
899 | #else | |
900 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
901 | #endif | |
902 | field->name, field->type.u.array.length); | |
903 | break; | |
904 | } | |
905 | case atype_sequence: | |
906 | { | |
907 | const struct lttng_basic_type *elem_type; | |
908 | const struct lttng_basic_type *length_type; | |
909 | ||
910 | elem_type = &field->type.u.sequence.elem_type; | |
911 | length_type = &field->type.u.sequence.length_type; | |
912 | ret = lttng_metadata_printf(session, | |
913 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
914 | length_type->u.basic.integer.size, | |
915 | (unsigned int) length_type->u.basic.integer.alignment, | |
916 | length_type->u.basic.integer.signedness, | |
917 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
918 | ? "none" | |
919 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
920 | ? "UTF8" | |
921 | : "ASCII"), | |
922 | length_type->u.basic.integer.base, | |
8a98a75d | 923 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
924 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
925 | #else | |
926 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
927 | #endif | |
928 | field->name); | |
929 | if (ret) | |
930 | return ret; | |
931 | ||
932 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 933 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
934 | elem_type->u.basic.integer.size, |
935 | (unsigned int) elem_type->u.basic.integer.alignment, | |
936 | elem_type->u.basic.integer.signedness, | |
937 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
938 | ? "none" | |
939 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
940 | ? "UTF8" | |
941 | : "ASCII"), | |
942 | elem_type->u.basic.integer.base, | |
8a98a75d | 943 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
944 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
945 | #else | |
946 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
947 | #endif | |
948 | field->name, | |
949 | field->name); | |
950 | break; | |
951 | } | |
952 | ||
953 | case atype_string: | |
954 | /* Default encoding is UTF8 */ | |
955 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 956 | " string%s _%s;\n", |
8020ceb5 MD |
957 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
958 | " { encoding = ASCII; }" : "", | |
959 | field->name); | |
960 | break; | |
961 | default: | |
962 | WARN_ON_ONCE(1); | |
963 | return -EINVAL; | |
964 | } | |
965 | return ret; | |
966 | } | |
967 | ||
968 | static | |
969 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
970 | struct lttng_ctx *ctx) | |
971 | { | |
972 | int ret = 0; | |
973 | int i; | |
974 | ||
975 | if (!ctx) | |
976 | return 0; | |
977 | for (i = 0; i < ctx->nr_fields; i++) { | |
978 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
979 | ||
980 | ret = _ltt_field_statedump(session, &field->event_field); | |
981 | if (ret) | |
982 | return ret; | |
983 | } | |
984 | return ret; | |
985 | } | |
986 | ||
987 | static | |
988 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
989 | struct ltt_event *event) | |
990 | { | |
991 | const struct lttng_event_desc *desc = event->desc; | |
992 | int ret = 0; | |
993 | int i; | |
994 | ||
995 | for (i = 0; i < desc->nr_fields; i++) { | |
996 | const struct lttng_event_field *field = &desc->fields[i]; | |
997 | ||
998 | ret = _ltt_field_statedump(session, field); | |
999 | if (ret) | |
1000 | return ret; | |
1001 | } | |
1002 | return ret; | |
1003 | } | |
1004 | ||
4e776b26 MD |
1005 | static |
1006 | int _ltt_callsite_metadata_statedump(struct ltt_session *session, | |
1007 | struct lttng_callsite *callsite) | |
1008 | { | |
1009 | int ret = 0; | |
1010 | ||
1011 | if (!CMM_ACCESS_ONCE(session->active)) | |
1012 | return 0; | |
1013 | ||
1014 | ret = lttng_metadata_printf(session, | |
1015 | "callsite {\n" | |
1016 | " name = \"%s\";\n" | |
1017 | " func = \"%s\";\n" | |
1018 | " file = \"%s\";\n" | |
1019 | " line = %u;\n" | |
1020 | "};\n\n", | |
1021 | callsite->tp_cs->tp->name, | |
1022 | callsite->tp_cs->func, | |
1023 | callsite->tp_cs->file, | |
1024 | callsite->tp_cs->lineno); | |
1025 | if (ret) | |
1026 | goto end; | |
1027 | end: | |
1028 | return ret; | |
1029 | } | |
1030 | ||
8020ceb5 MD |
1031 | static |
1032 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
1033 | struct ltt_channel *chan, | |
1034 | struct ltt_event *event) | |
1035 | { | |
1036 | int ret = 0; | |
8155c5e8 | 1037 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 1038 | |
b5234c06 | 1039 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1040 | return 0; |
1041 | if (chan == session->metadata) | |
1042 | return 0; | |
8165c8da MD |
1043 | /* |
1044 | * Don't print events for which probe load is pending. | |
1045 | */ | |
1046 | if (!event->desc) | |
1047 | return 0; | |
8020ceb5 MD |
1048 | |
1049 | ret = lttng_metadata_printf(session, | |
1050 | "event {\n" | |
7083f0fe | 1051 | " name = \"%s\";\n" |
8020ceb5 MD |
1052 | " id = %u;\n" |
1053 | " stream_id = %u;\n", | |
1054 | event->desc->name, | |
1055 | event->id, | |
1056 | event->chan->id); | |
1057 | if (ret) | |
1058 | goto end; | |
1059 | ||
8155c5e8 MD |
1060 | if (event->desc->loglevel) |
1061 | loglevel = *(*event->desc->loglevel); | |
1062 | ||
1063 | ret = lttng_metadata_printf(session, | |
1064 | " loglevel = %d;\n", | |
1065 | loglevel); | |
1066 | if (ret) | |
1067 | goto end; | |
e6c12e3d | 1068 | |
6ddc916d MD |
1069 | if (event->desc->u.ext.model_emf_uri) { |
1070 | ret = lttng_metadata_printf(session, | |
1071 | " model.emf.uri = \"%s\";\n", | |
1072 | *(event->desc->u.ext.model_emf_uri)); | |
1073 | if (ret) | |
1074 | goto end; | |
1075 | } | |
1076 | ||
8020ceb5 MD |
1077 | if (event->ctx) { |
1078 | ret = lttng_metadata_printf(session, | |
1079 | " context := struct {\n"); | |
1080 | if (ret) | |
1081 | goto end; | |
1082 | } | |
1083 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
1084 | if (ret) | |
1085 | goto end; | |
1086 | if (event->ctx) { | |
1087 | ret = lttng_metadata_printf(session, | |
1088 | " };\n"); | |
1089 | if (ret) | |
1090 | goto end; | |
1091 | } | |
1092 | ||
1093 | ret = lttng_metadata_printf(session, | |
1094 | " fields := struct {\n" | |
1095 | ); | |
1096 | if (ret) | |
1097 | goto end; | |
1098 | ||
1099 | ret = _ltt_fields_metadata_statedump(session, event); | |
1100 | if (ret) | |
1101 | goto end; | |
1102 | ||
1103 | /* | |
1104 | * LTTng space reservation can only reserve multiples of the | |
1105 | * byte size. | |
1106 | */ | |
1107 | ret = lttng_metadata_printf(session, | |
1108 | " };\n" | |
1109 | "};\n\n"); | |
1110 | if (ret) | |
1111 | goto end; | |
1112 | ||
1113 | event->metadata_dumped = 1; | |
1114 | end: | |
1115 | return ret; | |
1116 | ||
1117 | } | |
1118 | ||
1119 | static | |
1120 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
1121 | struct ltt_channel *chan) | |
1122 | { | |
1123 | int ret = 0; | |
1124 | ||
b5234c06 | 1125 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1126 | return 0; |
1127 | if (chan == session->metadata) | |
1128 | return 0; | |
1129 | ||
1130 | WARN_ON_ONCE(!chan->header_type); | |
1131 | ret = lttng_metadata_printf(session, | |
1132 | "stream {\n" | |
1133 | " id = %u;\n" | |
1134 | " event.header := %s;\n" | |
1135 | " packet.context := struct packet_context;\n", | |
1136 | chan->id, | |
1137 | chan->header_type == 1 ? "struct event_header_compact" : | |
1138 | "struct event_header_large"); | |
1139 | if (ret) | |
1140 | goto end; | |
1141 | ||
1142 | if (chan->ctx) { | |
1143 | ret = lttng_metadata_printf(session, | |
1144 | " event.context := struct {\n"); | |
1145 | if (ret) | |
1146 | goto end; | |
1147 | } | |
1148 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
1149 | if (ret) | |
1150 | goto end; | |
1151 | if (chan->ctx) { | |
1152 | ret = lttng_metadata_printf(session, | |
1153 | " };\n"); | |
1154 | if (ret) | |
1155 | goto end; | |
1156 | } | |
1157 | ||
1158 | ret = lttng_metadata_printf(session, | |
1159 | "};\n\n"); | |
1160 | ||
1161 | chan->metadata_dumped = 1; | |
1162 | end: | |
1163 | return ret; | |
1164 | } | |
1165 | ||
1166 | static | |
1167 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1168 | { | |
1169 | return lttng_metadata_printf(session, | |
1170 | "struct packet_context {\n" | |
28b12049 MD |
1171 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1172 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
1173 | " uint64_t content_size;\n" |
1174 | " uint64_t packet_size;\n" | |
18fc8d71 | 1175 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
1176 | " uint32_t cpu_id;\n" |
1177 | "};\n\n" | |
1178 | ); | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Compact header: | |
1183 | * id: range: 0 - 30. | |
1184 | * id 31 is reserved to indicate an extended header. | |
1185 | * | |
1186 | * Large header: | |
1187 | * id: range: 0 - 65534. | |
1188 | * id 65535 is reserved to indicate an extended header. | |
1189 | */ | |
1190 | static | |
1191 | int _ltt_event_header_declare(struct ltt_session *session) | |
1192 | { | |
1193 | return lttng_metadata_printf(session, | |
1194 | "struct event_header_compact {\n" | |
1195 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1196 | " variant <id> {\n" | |
1197 | " struct {\n" | |
28b12049 | 1198 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1199 | " } compact;\n" |
1200 | " struct {\n" | |
1201 | " uint32_t id;\n" | |
28b12049 | 1202 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1203 | " } extended;\n" |
1204 | " } v;\n" | |
1205 | "} align(%u);\n" | |
1206 | "\n" | |
1207 | "struct event_header_large {\n" | |
1208 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1209 | " variant <id> {\n" | |
1210 | " struct {\n" | |
28b12049 | 1211 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1212 | " } compact;\n" |
1213 | " struct {\n" | |
1214 | " uint32_t id;\n" | |
28b12049 | 1215 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1216 | " } extended;\n" |
1217 | " } v;\n" | |
1218 | "} align(%u);\n\n", | |
1dbfff0c MD |
1219 | lttng_alignof(uint32_t) * CHAR_BIT, |
1220 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1221 | ); |
1222 | } | |
1223 | ||
28b12049 MD |
1224 | /* |
1225 | * Approximation of NTP time of day to clock monotonic correlation, | |
1226 | * taken at start of trace. | |
1227 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1228 | * in future versions. | |
1229 | */ | |
1230 | static | |
1231 | uint64_t measure_clock_offset(void) | |
1232 | { | |
1233 | uint64_t offset, monotonic[2], realtime; | |
1234 | struct timespec rts = { 0, 0 }; | |
1235 | int ret; | |
1236 | ||
1237 | monotonic[0] = trace_clock_read64(); | |
1238 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1239 | if (ret < 0) | |
1240 | return 0; | |
1241 | monotonic[1] = trace_clock_read64(); | |
1242 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1243 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1244 | realtime += rts.tv_nsec; |
1245 | offset = realtime - offset; | |
1246 | return offset; | |
1247 | } | |
1248 | ||
8020ceb5 MD |
1249 | /* |
1250 | * Output metadata into this session's metadata buffers. | |
1251 | */ | |
1252 | static | |
1253 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1254 | { | |
b5234c06 | 1255 | unsigned char *uuid_c = session->uuid; |
19d8b1b3 MD |
1256 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1257 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
8020ceb5 MD |
1258 | struct ltt_channel *chan; |
1259 | struct ltt_event *event; | |
1260 | int ret = 0; | |
08114193 | 1261 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1262 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1263 | |
b5234c06 | 1264 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1265 | return 0; |
1266 | if (session->metadata_dumped) | |
1267 | goto skip_session; | |
1268 | if (!session->metadata) { | |
b5234c06 | 1269 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1270 | return -EPERM; |
1271 | } | |
1272 | ||
1273 | snprintf(uuid_s, sizeof(uuid_s), | |
1274 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1275 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1276 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1277 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1278 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1279 | ||
1280 | ret = lttng_metadata_printf(session, | |
1281 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1282 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1283 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1284 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1285 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1286 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1287 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1288 | "\n" | |
1289 | "trace {\n" | |
1290 | " major = %u;\n" | |
1291 | " minor = %u;\n" | |
1292 | " uuid = \"%s\";\n" | |
1293 | " byte_order = %s;\n" | |
1294 | " packet.header := struct {\n" | |
1295 | " uint32_t magic;\n" | |
1296 | " uint8_t uuid[16];\n" | |
1297 | " uint32_t stream_id;\n" | |
1298 | " };\n" | |
1299 | "};\n\n", | |
1dbfff0c MD |
1300 | lttng_alignof(uint8_t) * CHAR_BIT, |
1301 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1302 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1303 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1304 | sizeof(unsigned long) * CHAR_BIT, |
1305 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1306 | CTF_SPEC_MAJOR, |
1307 | CTF_SPEC_MINOR, | |
8020ceb5 | 1308 | uuid_s, |
8a98a75d | 1309 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1310 | "be" |
1311 | #else | |
1312 | "le" | |
1313 | #endif | |
1314 | ); | |
1315 | if (ret) | |
1316 | goto end; | |
1317 | ||
b020e504 | 1318 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1319 | hostname[0] = '\0'; |
1320 | ret = gethostname(hostname, sizeof(hostname)); | |
1321 | if (ret && errno == ENAMETOOLONG) | |
1322 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1323 | lttng_ust_getprocname(procname); |
1324 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1325 | ret = lttng_metadata_printf(session, |
1326 | "env {\n" | |
9e4d42a0 | 1327 | " hostname = \"%s\";\n" |
b020e504 MD |
1328 | " vpid = %d;\n" |
1329 | " procname = \"%s\";\n" | |
2694975d MD |
1330 | " domain = \"ust\";\n" |
1331 | " tracer_name = \"lttng-ust\";\n" | |
1332 | " tracer_major = %u;\n" | |
1333 | " tracer_minor = %u;\n" | |
1334 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1335 | "};\n\n", |
9e4d42a0 | 1336 | hostname, |
b020e504 MD |
1337 | (int) getpid(), |
1338 | procname, | |
2694975d MD |
1339 | LTTNG_UST_MAJOR_VERSION, |
1340 | LTTNG_UST_MINOR_VERSION, | |
1341 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1342 | ); |
1343 | if (ret) | |
1344 | goto end; | |
1345 | ||
28b12049 MD |
1346 | ret = lttng_metadata_printf(session, |
1347 | "clock {\n" | |
939950af MD |
1348 | " name = %s;\n", |
1349 | "monotonic" | |
1350 | ); | |
1351 | if (ret) | |
1352 | goto end; | |
1353 | ||
1354 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1355 | ret = lttng_metadata_printf(session, | |
1356 | " uuid = \"%s\";\n", | |
1357 | clock_uuid_s | |
1358 | ); | |
1359 | if (ret) | |
1360 | goto end; | |
1361 | } | |
1362 | ||
1363 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1364 | " description = \"Monotonic Clock\";\n" |
1365 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1366 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1367 | " offset = %" PRIu64 ";\n" | |
1368 | "};\n\n", | |
28b12049 MD |
1369 | trace_clock_freq(), |
1370 | measure_clock_offset() | |
1371 | ); | |
1372 | if (ret) | |
1373 | goto end; | |
1374 | ||
1375 | ret = lttng_metadata_printf(session, | |
1376 | "typealias integer {\n" | |
1377 | " size = 27; align = 1; signed = false;\n" | |
1378 | " map = clock.monotonic.value;\n" | |
1379 | "} := uint27_clock_monotonic_t;\n" | |
1380 | "\n" | |
1381 | "typealias integer {\n" | |
1382 | " size = 32; align = %u; signed = false;\n" | |
1383 | " map = clock.monotonic.value;\n" | |
1384 | "} := uint32_clock_monotonic_t;\n" | |
1385 | "\n" | |
1386 | "typealias integer {\n" | |
1387 | " size = 64; align = %u; signed = false;\n" | |
1388 | " map = clock.monotonic.value;\n" | |
1389 | "} := uint64_clock_monotonic_t;\n\n", | |
1390 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1391 | lttng_alignof(uint64_t) * CHAR_BIT | |
1392 | ); | |
1393 | if (ret) | |
1394 | goto end; | |
1395 | ||
8020ceb5 MD |
1396 | ret = _ltt_stream_packet_context_declare(session); |
1397 | if (ret) | |
1398 | goto end; | |
1399 | ||
1400 | ret = _ltt_event_header_declare(session); | |
1401 | if (ret) | |
1402 | goto end; | |
4e776b26 MD |
1403 | ret = _callsite_session_metadata_statedump(session); |
1404 | if (ret) | |
1405 | goto end; | |
8020ceb5 MD |
1406 | |
1407 | skip_session: | |
b5234c06 | 1408 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1409 | ret = _ltt_channel_metadata_statedump(session, chan); |
1410 | if (ret) | |
1411 | goto end; | |
1412 | } | |
1413 | ||
b5234c06 | 1414 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1415 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1416 | if (ret) | |
1417 | goto end; | |
1418 | } | |
1419 | session->metadata_dumped = 1; | |
1420 | end: | |
1421 | return ret; | |
1422 | } | |
1423 | ||
003fedf4 | 1424 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1425 | { |
1426 | struct ltt_session *session, *tmpsession; | |
1427 | ||
b5234c06 | 1428 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1429 | ltt_session_destroy(session); |
8020ceb5 | 1430 | } |
457a6b58 MD |
1431 | |
1432 | /* WILDCARDS */ | |
1433 | ||
1434 | static | |
1435 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1436 | enum lttng_ust_loglevel_type loglevel_type, | |
1437 | int loglevel) | |
1438 | { | |
1439 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1440 | return 1; | |
1441 | else | |
1442 | return 0; | |
1443 | } | |
1444 | ||
1445 | #if 0 | |
1446 | static | |
1447 | int wildcard_is_within(struct wildcard_entry *e, | |
1448 | enum lttng_ust_loglevel_type loglevel_type, | |
1449 | int loglevel) | |
1450 | { | |
1451 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1452 | || e->loglevel == -1) | |
1453 | return 1; | |
1454 | switch (e->loglevel_type) { | |
1455 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1456 | switch (loglevel_type) { | |
1457 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1458 | if (e->loglevel >= loglevel) | |
1459 | return 1; | |
1460 | else | |
1461 | return 0; | |
1462 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1463 | if (e->loglevel <= 0 && loglevel == 0) | |
1464 | return 1; | |
1465 | else | |
1466 | return 0; | |
1467 | } | |
1468 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1469 | switch (loglevel_type) { | |
1470 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1471 | if (loglevel <= 0) | |
1472 | return 1; | |
1473 | else | |
1474 | return 0; | |
1475 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1476 | if (e->loglevel == loglevel) | |
1477 | return 1; | |
1478 | else | |
1479 | return 0; | |
1480 | } | |
1481 | } | |
1482 | } | |
1483 | #endif | |
1484 | ||
1485 | /* | |
1486 | * Add the wildcard to the wildcard list. Must be called with | |
1487 | * ust lock held. | |
1488 | */ | |
1489 | static | |
1490 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1491 | struct lttng_ust_event *event_param) | |
1492 | { | |
1493 | struct wildcard_entry *e; | |
1494 | struct session_wildcard *sw; | |
1495 | size_t name_len = strlen(event_param->name) + 1; | |
1496 | int found = 0; | |
1497 | ||
1498 | /* | |
1499 | * Try to find global wildcard entry. Given that this is shared | |
1500 | * across all sessions, we need to check for exact loglevel | |
1501 | * match, not just whether contained within the existing ones. | |
1502 | */ | |
1503 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1504 | if (!strncmp(event_param->name, e->name, | |
1505 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1506 | if (wildcard_same_loglevel(e, | |
1507 | event_param->loglevel_type, | |
1508 | event_param->loglevel)) { | |
1509 | found = 1; | |
1510 | break; | |
1511 | } | |
1512 | } | |
1513 | } | |
1514 | ||
1515 | if (!found) { | |
1516 | /* | |
1517 | * Create global wildcard entry if not found. Using | |
1518 | * zmalloc here to allocate a variable length element. | |
1519 | * Could cause some memory fragmentation if overused. | |
1520 | */ | |
1521 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1522 | if (!e) | |
1523 | return ERR_PTR(-ENOMEM); | |
1524 | memcpy(&e->name[0], event_param->name, name_len); | |
aa141955 MD |
1525 | e->loglevel_type = event_param->loglevel_type; |
1526 | e->loglevel = event_param->loglevel; | |
457a6b58 MD |
1527 | cds_list_add(&e->list, &wildcard_list); |
1528 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1529 | } | |
1530 | ||
1531 | /* session wildcard */ | |
1532 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1533 | if (chan == sw->chan) { | |
1534 | DBG("wildcard %s busy for this channel", | |
1535 | event_param->name); | |
1536 | return ERR_PTR(-EEXIST); /* Already there */ | |
1537 | } | |
1538 | } | |
1539 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1540 | if (!sw) | |
1541 | return ERR_PTR(-ENOMEM); | |
1542 | sw->chan = chan; | |
1543 | sw->enabled = 1; | |
1544 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1545 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1546 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1547 | sw->event_param.loglevel = event_param->loglevel; | |
1548 | CDS_INIT_LIST_HEAD(&sw->events); | |
1549 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1550 | cds_list_add(&sw->session_list, &e->session_list); | |
1551 | sw->entry = e; | |
1552 | ltt_probes_create_wildcard_events(e, sw); | |
1553 | return sw; | |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Remove the wildcard from the wildcard list. Must be called with | |
1558 | * ust_lock held. Only called at session teardown. | |
1559 | */ | |
1560 | static | |
1561 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1562 | { | |
1563 | struct ltt_event *ev, *tmp; | |
1564 | ||
1565 | /* | |
1566 | * Just remove the events owned (for enable/disable) by this | |
1567 | * wildcard from the list. The session teardown will take care | |
1568 | * of freeing the event memory. | |
1569 | */ | |
1570 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1571 | wildcard_list) { | |
1572 | cds_list_del(&ev->wildcard_list); | |
1573 | } | |
1574 | cds_list_del(&wildcard->session_list); | |
1575 | cds_list_del(&wildcard->list); | |
1576 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1577 | cds_list_del(&wildcard->entry->list); | |
1578 | free(wildcard->entry); | |
1579 | } | |
2d78951a | 1580 | free(wildcard->filter_bytecode); |
457a6b58 MD |
1581 | free(wildcard); |
1582 | } | |
1583 | ||
1584 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1585 | struct lttng_ust_event *event_param, | |
1586 | struct session_wildcard **_sw) | |
1587 | { | |
1588 | struct session_wildcard *sw; | |
1589 | ||
1590 | sw = add_wildcard(chan, event_param); | |
1591 | if (!sw || IS_ERR(sw)) { | |
1592 | return PTR_ERR(sw); | |
1593 | } | |
1594 | *_sw = sw; | |
1595 | return 0; | |
1596 | } | |
1597 | ||
1598 | static | |
1599 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1600 | { | |
1601 | _remove_wildcard(sw); | |
1602 | } | |
1603 | ||
1604 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1605 | { | |
1606 | struct ltt_event *ev; | |
1607 | int ret; | |
1608 | ||
1609 | if (wildcard->enabled) | |
1610 | return -EEXIST; | |
1611 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1612 | ret = ltt_event_enable(ev); | |
1613 | if (ret) { | |
1614 | DBG("Error: enable error.\n"); | |
1615 | return ret; | |
1616 | } | |
1617 | } | |
1618 | wildcard->enabled = 1; | |
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1623 | { | |
1624 | struct ltt_event *ev; | |
1625 | int ret; | |
1626 | ||
1627 | if (!wildcard->enabled) | |
1628 | return -EEXIST; | |
1629 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1630 | ret = ltt_event_disable(ev); | |
1631 | if (ret) { | |
1632 | DBG("Error: disable error.\n"); | |
1633 | return ret; | |
1634 | } | |
1635 | } | |
1636 | wildcard->enabled = 0; | |
1637 | return 0; | |
1638 | } | |
eddd8d5d MD |
1639 | |
1640 | /* | |
1641 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1642 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1643 | * taken in constructors, which are called with dynamic linker mutex | |
1644 | * held. | |
1645 | */ | |
1646 | void lttng_fixup_event_tls(void) | |
1647 | { | |
60c089cf | 1648 | unsigned char uuid[LTTNG_UST_UUID_STR_LEN]; |
eddd8d5d | 1649 | |
60c089cf | 1650 | (void) lttng_ust_uuid_generate(uuid); |
eddd8d5d | 1651 | } |