Commit | Line | Data |
---|---|---|
8020ceb5 | 1 | /* |
7dd08bec | 2 | * lttng-events.c |
8020ceb5 | 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" |
7dd08bec MD |
53 | #include "lttng-tracer.h" |
54 | #include "lttng-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 | |
7dd08bec | 78 | static void _lttng_event_destroy(struct lttng_event *event); |
7dd08bec | 79 | static int _lttng_event_unregister(struct lttng_event *event); |
8020ceb5 | 80 | static |
7dd08bec MD |
81 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
82 | struct lttng_channel *chan, | |
83 | struct lttng_event *event); | |
8020ceb5 | 84 | static |
7dd08bec | 85 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
8020ceb5 | 86 | |
e58095ef MD |
87 | static |
88 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
89 | static | |
90 | void lttng_session_sync_enablers(struct lttng_session *session); | |
91 | static | |
92 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
93 | ||
94 | static | |
95 | int lttng_loglevel_match(int loglevel, | |
96 | unsigned int has_loglevel, | |
457a6b58 MD |
97 | enum lttng_ust_loglevel_type req_type, |
98 | int req_loglevel) | |
99 | { | |
457a6b58 MD |
100 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) |
101 | return 1; | |
e58095ef MD |
102 | if (!has_loglevel) |
103 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
104 | switch (req_type) { |
105 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e58095ef | 106 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
107 | return 1; |
108 | else | |
109 | return 0; | |
110 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 111 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
112 | return 1; |
113 | else | |
114 | return 0; | |
115 | case LTTNG_UST_LOGLEVEL_ALL: | |
116 | default: | |
117 | return 1; | |
118 | } | |
119 | } | |
120 | ||
8020ceb5 MD |
121 | void synchronize_trace(void) |
122 | { | |
8020ceb5 | 123 | synchronize_rcu(); |
8020ceb5 MD |
124 | } |
125 | ||
7dd08bec | 126 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 127 | { |
7dd08bec | 128 | struct lttng_session *session; |
74d81a6c | 129 | int i; |
8020ceb5 | 130 | |
7dd08bec | 131 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
132 | if (!session) |
133 | return NULL; | |
e58095ef MD |
134 | CDS_INIT_LIST_HEAD(&session->chan_head); |
135 | CDS_INIT_LIST_HEAD(&session->events_head); | |
136 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
d56fa719 MD |
137 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
138 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
e58095ef | 139 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
140 | return session; |
141 | } | |
142 | ||
74d81a6c MD |
143 | /* |
144 | * Only used internally at session destruction. | |
145 | */ | |
146 | static | |
147 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
148 | { | |
149 | struct channel *chan; | |
150 | struct lttng_ust_shm_handle *handle; | |
151 | ||
152 | cds_list_del(<tng_chan->node); | |
153 | lttng_destroy_context(lttng_chan->ctx); | |
154 | chan = lttng_chan->chan; | |
155 | handle = lttng_chan->handle; | |
156 | /* | |
157 | * note: lttng_chan is private data contained within handle. It | |
158 | * will be freed along with the handle. | |
159 | */ | |
160 | channel_destroy(chan, handle, 0); | |
161 | } | |
162 | ||
7dd08bec | 163 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 164 | { |
7dd08bec MD |
165 | struct lttng_channel *chan, *tmpchan; |
166 | struct lttng_event *event, *tmpevent; | |
e58095ef | 167 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 MD |
168 | int ret; |
169 | ||
b5234c06 | 170 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 171 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 172 | ret = _lttng_event_unregister(event); |
8020ceb5 MD |
173 | WARN_ON(ret); |
174 | } | |
175 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
176 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
177 | &session->enablers_head, node) | |
178 | lttng_enabler_destroy(enabler); | |
179 | cds_list_for_each_entry_safe(event, tmpevent, | |
180 | &session->events_head, node) | |
7dd08bec | 181 | _lttng_event_destroy(event); |
e58095ef | 182 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 183 | _lttng_channel_unmap(chan); |
e58095ef | 184 | cds_list_del(&session->node); |
b5234c06 | 185 | free(session); |
8020ceb5 MD |
186 | } |
187 | ||
7dd08bec | 188 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
189 | { |
190 | int ret = 0; | |
7dd08bec | 191 | struct lttng_channel *chan; |
8020ceb5 | 192 | |
8020ceb5 MD |
193 | if (session->active) { |
194 | ret = -EBUSY; | |
195 | goto end; | |
196 | } | |
197 | ||
e58095ef MD |
198 | /* We need to sync enablers with session before activation. */ |
199 | lttng_session_sync_enablers(session); | |
200 | ||
8020ceb5 MD |
201 | /* |
202 | * Snapshot the number of events per channel to know the type of header | |
203 | * we need to use. | |
204 | */ | |
e58095ef | 205 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
8020ceb5 MD |
206 | if (chan->header_type) |
207 | continue; /* don't change it if session stop/restart */ | |
208 | if (chan->free_event_id < 31) | |
209 | chan->header_type = 1; /* compact */ | |
210 | else | |
211 | chan->header_type = 2; /* large */ | |
212 | } | |
213 | ||
b5234c06 MD |
214 | CMM_ACCESS_ONCE(session->active) = 1; |
215 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
7dd08bec | 216 | ret = _lttng_session_metadata_statedump(session); |
4b4de73e | 217 | if (ret) |
b5234c06 | 218 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 219 | end: |
8020ceb5 MD |
220 | return ret; |
221 | } | |
222 | ||
7dd08bec | 223 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
224 | { |
225 | int ret = 0; | |
226 | ||
8020ceb5 MD |
227 | if (!session->active) { |
228 | ret = -EBUSY; | |
229 | goto end; | |
230 | } | |
b5234c06 | 231 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 232 | end: |
8020ceb5 MD |
233 | return ret; |
234 | } | |
235 | ||
7dd08bec | 236 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea MD |
237 | { |
238 | int old; | |
239 | ||
9beb36ba MD |
240 | if (channel == channel->session->metadata) |
241 | return -EPERM; | |
b5234c06 | 242 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
243 | if (old) |
244 | return -EEXIST; | |
245 | return 0; | |
246 | } | |
247 | ||
7dd08bec | 248 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea MD |
249 | { |
250 | int old; | |
251 | ||
9beb36ba MD |
252 | if (channel == channel->session->metadata) |
253 | return -EPERM; | |
b5234c06 | 254 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
255 | if (!old) |
256 | return -EEXIST; | |
257 | return 0; | |
258 | } | |
259 | ||
7dd08bec | 260 | int lttng_event_enable(struct lttng_event *event) |
976fe9ea MD |
261 | { |
262 | int old; | |
263 | ||
9beb36ba MD |
264 | if (event->chan == event->chan->session->metadata) |
265 | return -EPERM; | |
b5234c06 | 266 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
267 | if (old) |
268 | return -EEXIST; | |
269 | return 0; | |
270 | } | |
271 | ||
7dd08bec | 272 | int lttng_event_disable(struct lttng_event *event) |
976fe9ea MD |
273 | { |
274 | int old; | |
275 | ||
9beb36ba MD |
276 | if (event->chan == event->chan->session->metadata) |
277 | return -EPERM; | |
b5234c06 | 278 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
279 | if (!old) |
280 | return -EEXIST; | |
281 | return 0; | |
282 | } | |
283 | ||
8020ceb5 MD |
284 | /* |
285 | * Supports event creation while tracing session is active. | |
286 | */ | |
e58095ef MD |
287 | static |
288 | int lttng_event_create(const struct lttng_event_desc *desc, | |
289 | struct lttng_channel *chan) | |
8020ceb5 | 290 | { |
e58095ef | 291 | const char *event_name = desc->name; |
7dd08bec | 292 | struct lttng_event *event; |
d56fa719 MD |
293 | struct cds_hlist_head *head; |
294 | struct cds_hlist_node *node; | |
576599a0 | 295 | int ret = 0; |
d56fa719 MD |
296 | size_t name_len = strlen(event_name); |
297 | uint32_t hash; | |
8020ceb5 | 298 | |
38eb0baa | 299 | if (chan->used_event_id == -1U) { |
576599a0 | 300 | ret = -ENOMEM; |
8020ceb5 | 301 | goto full; |
576599a0 | 302 | } |
d56fa719 MD |
303 | hash = jhash(event_name, name_len, 0); |
304 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
305 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
306 | assert(event->desc); |
307 | if (!strncmp(event->desc->name, | |
308 | desc->name, | |
ff412fb5 | 309 | LTTNG_UST_SYM_NAME_LEN - 1)) { |
576599a0 | 310 | ret = -EEXIST; |
8020ceb5 | 311 | goto exist; |
576599a0 MD |
312 | } |
313 | } | |
457a6b58 MD |
314 | |
315 | /* | |
316 | * Check if loglevel match. Refuse to connect event if not. | |
317 | */ | |
7dd08bec | 318 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
319 | if (!event) { |
320 | ret = -ENOMEM; | |
8020ceb5 | 321 | goto cache_error; |
576599a0 | 322 | } |
8020ceb5 | 323 | event->chan = chan; |
e58095ef | 324 | |
8165c8da MD |
325 | /* |
326 | * used_event_id counts the maximum number of event IDs that can | |
327 | * register if all probes register. | |
328 | */ | |
329 | chan->used_event_id++; | |
976fe9ea | 330 | event->enabled = 1; |
e58095ef MD |
331 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
332 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
333 | event->desc = desc; | |
7dd08bec | 334 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 335 | cmm_smp_wmb(); |
e58095ef MD |
336 | ret = __tracepoint_probe_register(event_name, |
337 | desc->probe_callback, | |
338 | event, desc->signature); | |
339 | if (ret) | |
340 | goto register_error; | |
341 | event->id = chan->free_event_id++; | |
342 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); | |
343 | if (ret) | |
344 | goto statedump_error; | |
345 | cds_list_add(&event->node, &chan->session->events_head); | |
d56fa719 | 346 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 347 | return 0; |
8020ceb5 MD |
348 | |
349 | statedump_error: | |
e58095ef MD |
350 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_name, |
351 | desc->probe_callback, | |
352 | event)); | |
8020ceb5 | 353 | register_error: |
b5234c06 | 354 | free(event); |
8020ceb5 MD |
355 | cache_error: |
356 | exist: | |
357 | full: | |
576599a0 | 358 | return ret; |
8020ceb5 MD |
359 | } |
360 | ||
e58095ef MD |
361 | static |
362 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
363 | struct lttng_enabler *enabler) | |
364 | { | |
365 | int loglevel = 0; | |
366 | unsigned int has_loglevel; | |
367 | ||
368 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
369 | /* Compare excluding final '*' */ | |
370 | if (strncmp(desc->name, enabler->event_param.name, | |
371 | strlen(enabler->event_param.name) - 1)) | |
372 | return 0; | |
373 | if (desc->loglevel) { | |
374 | loglevel = *(*desc->loglevel); | |
375 | has_loglevel = 1; | |
376 | } | |
377 | if (!lttng_loglevel_match(loglevel, | |
378 | has_loglevel, | |
379 | enabler->event_param.loglevel_type, | |
380 | enabler->event_param.loglevel)) | |
381 | return 0; | |
382 | return 1; | |
383 | } | |
384 | ||
385 | static | |
386 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
387 | struct lttng_enabler *enabler) | |
388 | { | |
389 | int loglevel = 0; | |
390 | unsigned int has_loglevel = 0; | |
391 | ||
392 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
393 | if (strcmp(desc->name, enabler->event_param.name)) | |
394 | return 0; | |
395 | if (desc->loglevel) { | |
396 | loglevel = *(*desc->loglevel); | |
397 | has_loglevel = 1; | |
398 | } | |
399 | if (!lttng_loglevel_match(loglevel, | |
400 | has_loglevel, | |
401 | enabler->event_param.loglevel_type, | |
402 | enabler->event_param.loglevel)) | |
403 | return 0; | |
404 | return 1; | |
405 | } | |
406 | ||
407 | static | |
408 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
409 | struct lttng_enabler *enabler) | |
410 | { | |
411 | switch (enabler->type) { | |
412 | case LTTNG_ENABLER_WILDCARD: | |
413 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
414 | case LTTNG_ENABLER_EVENT: | |
415 | return lttng_desc_match_event_enabler(desc, enabler); | |
416 | default: | |
417 | return -EINVAL; | |
418 | } | |
419 | } | |
420 | ||
421 | static | |
422 | int lttng_event_match_enabler(struct lttng_event *event, | |
423 | struct lttng_enabler *enabler) | |
424 | { | |
425 | return lttng_desc_match_enabler(event->desc, enabler); | |
426 | } | |
427 | ||
428 | static | |
429 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
430 | struct lttng_enabler *enabler) | |
431 | { | |
432 | struct lttng_enabler_ref *enabler_ref; | |
433 | ||
434 | cds_list_for_each_entry(enabler_ref, | |
435 | &event->enablers_ref_head, node) { | |
436 | if (enabler_ref->ref == enabler) | |
437 | return enabler_ref; | |
438 | } | |
439 | return NULL; | |
440 | } | |
441 | ||
8020ceb5 | 442 | /* |
e58095ef MD |
443 | * Create struct lttng_event if it is missing and present in the list of |
444 | * tracepoint probes. | |
8020ceb5 | 445 | */ |
e58095ef MD |
446 | static |
447 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 448 | { |
e58095ef MD |
449 | struct lttng_session *session = enabler->chan->session; |
450 | struct lttng_probe_desc *probe_desc; | |
451 | const struct lttng_event_desc *desc; | |
452 | struct lttng_event *event; | |
453 | int i; | |
454 | struct cds_list_head *probe_list; | |
455 | ||
456 | probe_list = lttng_get_probe_list_head(); | |
457 | /* | |
458 | * For each probe event, if we find that a probe event matches | |
459 | * our enabler, create an associated lttng_event if not | |
460 | * already present. | |
461 | */ | |
462 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
463 | for (i = 0; i < probe_desc->nr_events; i++) { | |
464 | int found = 0, ret; | |
d56fa719 MD |
465 | struct cds_hlist_head *head; |
466 | struct cds_hlist_node *node; | |
467 | const char *event_name; | |
468 | size_t name_len; | |
469 | uint32_t hash; | |
e58095ef MD |
470 | |
471 | desc = probe_desc->event_desc[i]; | |
472 | if (!lttng_desc_match_enabler(desc, enabler)) | |
473 | continue; | |
d56fa719 MD |
474 | event_name = desc->name; |
475 | name_len = strlen(event_name); | |
e58095ef MD |
476 | |
477 | /* | |
d56fa719 | 478 | * Check if already created. |
e58095ef | 479 | */ |
d56fa719 MD |
480 | hash = jhash(event_name, name_len, 0); |
481 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
482 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
483 | if (event->desc == desc) |
484 | found = 1; | |
485 | } | |
486 | if (found) | |
487 | continue; | |
488 | ||
489 | /* | |
490 | * We need to create an event for this | |
491 | * event probe. | |
492 | */ | |
493 | ret = lttng_event_create(probe_desc->event_desc[i], | |
494 | enabler->chan); | |
495 | if (ret) { | |
496 | DBG("Unable to create event %s\n", | |
497 | probe_desc->event_desc[i]->name); | |
498 | } | |
8165c8da | 499 | } |
8020ceb5 | 500 | } |
8020ceb5 MD |
501 | } |
502 | ||
503 | /* | |
e58095ef MD |
504 | * Create events associated with an enabler (if not already present), |
505 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
506 | */ |
507 | static | |
e58095ef | 508 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 509 | { |
e58095ef MD |
510 | struct lttng_session *session = enabler->chan->session; |
511 | struct lttng_event *event; | |
512 | ||
513 | /* First ensure that probe events are created for this enabler. */ | |
514 | lttng_create_event_if_missing(enabler); | |
515 | ||
516 | /* For each event matching enabler in session event list. */ | |
517 | cds_list_for_each_entry(event, &session->events_head, node) { | |
518 | struct lttng_enabler_ref *enabler_ref; | |
519 | ||
520 | if (!lttng_event_match_enabler(event, enabler)) | |
521 | continue; | |
522 | ||
523 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
524 | if (!enabler_ref) { | |
525 | /* | |
526 | * If no backward ref, create it. | |
527 | * Add backward ref from event to enabler. | |
528 | */ | |
529 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
530 | if (!enabler_ref) | |
531 | return -ENOMEM; | |
532 | enabler_ref->ref = enabler; | |
533 | cds_list_add(&enabler_ref->node, | |
534 | &event->enablers_ref_head); | |
8165c8da | 535 | } |
e58095ef MD |
536 | |
537 | /* | |
538 | * Link filter bytecodes if not linked yet. | |
539 | */ | |
540 | lttng_enabler_event_link_bytecode(event, enabler); | |
541 | ||
542 | /* TODO: merge event context. */ | |
543 | } | |
544 | return 0; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Called at library load: connect the probe on all enablers matching | |
549 | * this event. | |
550 | * called with session mutex held. | |
551 | * TODO: currently, for each desc added, we iterate on all event desc | |
552 | * (inefficient). We should create specific code that only target the | |
553 | * added desc. | |
554 | */ | |
555 | int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc) | |
556 | { | |
557 | struct lttng_session *session; | |
558 | ||
559 | cds_list_for_each_entry(session, &sessions, node) { | |
560 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 561 | } |
e58095ef MD |
562 | return 0; |
563 | } | |
564 | ||
565 | /* | |
566 | * Only used internally at session destruction. | |
567 | */ | |
568 | int _lttng_event_unregister(struct lttng_event *event) | |
569 | { | |
570 | return __tracepoint_probe_unregister(event->desc->name, | |
571 | event->desc->probe_callback, | |
572 | event); | |
573 | } | |
574 | ||
575 | /* | |
576 | * Only used internally at session destruction. | |
577 | */ | |
578 | static | |
579 | void _lttng_event_destroy(struct lttng_event *event) | |
580 | { | |
581 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
582 | ||
e58095ef | 583 | cds_list_del(&event->node); |
8020ceb5 | 584 | lttng_destroy_context(event->ctx); |
f488575f | 585 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
586 | /* Free event enabler refs */ |
587 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
588 | &event->enablers_ref_head, node) | |
589 | free(enabler_ref); | |
b5234c06 | 590 | free(event); |
8020ceb5 MD |
591 | } |
592 | ||
593 | /* | |
594 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 595 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
596 | * remaining space left in packet and write, since mutual exclusion |
597 | * protects us from concurrent writes. | |
598 | */ | |
7dd08bec | 599 | int lttng_metadata_printf(struct lttng_session *session, |
8020ceb5 MD |
600 | const char *fmt, ...) |
601 | { | |
4cfec15c | 602 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
7dd08bec | 603 | struct lttng_channel *chan = session->metadata; |
b5234c06 | 604 | char *str = NULL; |
8020ceb5 MD |
605 | int ret = 0, waitret; |
606 | size_t len, reserve_len, pos; | |
607 | va_list ap; | |
608 | ||
b5234c06 | 609 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
610 | |
611 | va_start(ap, fmt); | |
b5234c06 | 612 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 613 | va_end(ap); |
b5234c06 | 614 | if (ret < 0) |
8020ceb5 MD |
615 | return -ENOMEM; |
616 | ||
617 | len = strlen(str); | |
618 | pos = 0; | |
619 | ||
620 | for (pos = 0; pos < len; pos += reserve_len) { | |
621 | reserve_len = min_t(size_t, | |
1d498196 | 622 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
623 | len - pos); |
624 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 625 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
626 | /* |
627 | * We don't care about metadata buffer's records lost | |
628 | * count, because we always retry here. Report error if | |
629 | * we need to bail out after timeout or being | |
630 | * interrupted. | |
631 | */ | |
b5234c06 | 632 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
633 | ({ |
634 | ret = chan->ops->event_reserve(&ctx, 0); | |
635 | ret != -ENOBUFS || !ret; | |
636 | }), | |
b5234c06 | 637 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 638 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
639 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
640 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 641 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 642 | if (waitret == -EINTR) |
8020ceb5 MD |
643 | ret = waitret; |
644 | goto end; | |
645 | } | |
646 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
647 | chan->ops->event_commit(&ctx); | |
648 | } | |
649 | end: | |
b5234c06 | 650 | free(str); |
8020ceb5 MD |
651 | return ret; |
652 | } | |
653 | ||
654 | static | |
7dd08bec | 655 | int _lttng_field_statedump(struct lttng_session *session, |
8020ceb5 MD |
656 | const struct lttng_event_field *field) |
657 | { | |
658 | int ret = 0; | |
659 | ||
180901e6 | 660 | if (field->nowrite) |
4774c8f3 MD |
661 | return 0; |
662 | ||
8020ceb5 MD |
663 | switch (field->type.atype) { |
664 | case atype_integer: | |
665 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 666 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
667 | field->type.u.basic.integer.size, |
668 | field->type.u.basic.integer.alignment, | |
669 | field->type.u.basic.integer.signedness, | |
670 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
671 | ? "none" | |
672 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
673 | ? "UTF8" | |
674 | : "ASCII", | |
675 | field->type.u.basic.integer.base, | |
8a98a75d | 676 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
677 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
678 | #else | |
679 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
680 | #endif | |
681 | field->name); | |
682 | break; | |
683 | case atype_float: | |
684 | ret = lttng_metadata_printf(session, | |
8a98a75d | 685 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
686 | field->type.u.basic._float.exp_dig, |
687 | field->type.u.basic._float.mant_dig, | |
688 | field->type.u.basic._float.alignment, | |
8a98a75d | 689 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
690 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
691 | #else | |
692 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
693 | #endif | |
694 | field->name); | |
695 | break; | |
696 | case atype_enum: | |
697 | ret = lttng_metadata_printf(session, | |
698 | " %s %s;\n", | |
699 | field->type.u.basic.enumeration.name, | |
700 | field->name); | |
701 | break; | |
702 | case atype_array: | |
703 | { | |
704 | const struct lttng_basic_type *elem_type; | |
705 | ||
706 | elem_type = &field->type.u.array.elem_type; | |
707 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 708 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
709 | elem_type->u.basic.integer.size, |
710 | elem_type->u.basic.integer.alignment, | |
711 | elem_type->u.basic.integer.signedness, | |
712 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
713 | ? "none" | |
714 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
715 | ? "UTF8" | |
716 | : "ASCII", | |
717 | elem_type->u.basic.integer.base, | |
8a98a75d | 718 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
719 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
720 | #else | |
721 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
722 | #endif | |
723 | field->name, field->type.u.array.length); | |
724 | break; | |
725 | } | |
726 | case atype_sequence: | |
727 | { | |
728 | const struct lttng_basic_type *elem_type; | |
729 | const struct lttng_basic_type *length_type; | |
730 | ||
731 | elem_type = &field->type.u.sequence.elem_type; | |
732 | length_type = &field->type.u.sequence.length_type; | |
733 | ret = lttng_metadata_printf(session, | |
734 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
735 | length_type->u.basic.integer.size, | |
736 | (unsigned int) length_type->u.basic.integer.alignment, | |
737 | length_type->u.basic.integer.signedness, | |
738 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
739 | ? "none" | |
740 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
741 | ? "UTF8" | |
742 | : "ASCII"), | |
743 | length_type->u.basic.integer.base, | |
8a98a75d | 744 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
745 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
746 | #else | |
747 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
748 | #endif | |
749 | field->name); | |
750 | if (ret) | |
751 | return ret; | |
752 | ||
753 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 754 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
755 | elem_type->u.basic.integer.size, |
756 | (unsigned int) elem_type->u.basic.integer.alignment, | |
757 | elem_type->u.basic.integer.signedness, | |
758 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
759 | ? "none" | |
760 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
761 | ? "UTF8" | |
762 | : "ASCII"), | |
763 | elem_type->u.basic.integer.base, | |
8a98a75d | 764 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
765 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
766 | #else | |
767 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
768 | #endif | |
769 | field->name, | |
770 | field->name); | |
771 | break; | |
772 | } | |
773 | ||
774 | case atype_string: | |
775 | /* Default encoding is UTF8 */ | |
776 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 777 | " string%s _%s;\n", |
8020ceb5 MD |
778 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
779 | " { encoding = ASCII; }" : "", | |
780 | field->name); | |
781 | break; | |
782 | default: | |
783 | WARN_ON_ONCE(1); | |
784 | return -EINVAL; | |
785 | } | |
786 | return ret; | |
787 | } | |
788 | ||
789 | static | |
7dd08bec | 790 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8020ceb5 MD |
791 | struct lttng_ctx *ctx) |
792 | { | |
793 | int ret = 0; | |
794 | int i; | |
795 | ||
796 | if (!ctx) | |
797 | return 0; | |
798 | for (i = 0; i < ctx->nr_fields; i++) { | |
799 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
800 | ||
7dd08bec | 801 | ret = _lttng_field_statedump(session, &field->event_field); |
8020ceb5 MD |
802 | if (ret) |
803 | return ret; | |
804 | } | |
805 | return ret; | |
806 | } | |
807 | ||
808 | static | |
7dd08bec MD |
809 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
810 | struct lttng_event *event) | |
8020ceb5 MD |
811 | { |
812 | const struct lttng_event_desc *desc = event->desc; | |
813 | int ret = 0; | |
814 | int i; | |
815 | ||
816 | for (i = 0; i < desc->nr_fields; i++) { | |
817 | const struct lttng_event_field *field = &desc->fields[i]; | |
818 | ||
7dd08bec | 819 | ret = _lttng_field_statedump(session, field); |
8020ceb5 MD |
820 | if (ret) |
821 | return ret; | |
822 | } | |
823 | return ret; | |
824 | } | |
825 | ||
826 | static | |
7dd08bec MD |
827 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
828 | struct lttng_channel *chan, | |
829 | struct lttng_event *event) | |
8020ceb5 MD |
830 | { |
831 | int ret = 0; | |
8155c5e8 | 832 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 833 | |
b5234c06 | 834 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
835 | return 0; |
836 | if (chan == session->metadata) | |
837 | return 0; | |
8165c8da MD |
838 | /* |
839 | * Don't print events for which probe load is pending. | |
840 | */ | |
841 | if (!event->desc) | |
842 | return 0; | |
8020ceb5 MD |
843 | |
844 | ret = lttng_metadata_printf(session, | |
845 | "event {\n" | |
7083f0fe | 846 | " name = \"%s\";\n" |
8020ceb5 MD |
847 | " id = %u;\n" |
848 | " stream_id = %u;\n", | |
849 | event->desc->name, | |
850 | event->id, | |
851 | event->chan->id); | |
852 | if (ret) | |
853 | goto end; | |
854 | ||
8155c5e8 MD |
855 | if (event->desc->loglevel) |
856 | loglevel = *(*event->desc->loglevel); | |
857 | ||
858 | ret = lttng_metadata_printf(session, | |
859 | " loglevel = %d;\n", | |
860 | loglevel); | |
861 | if (ret) | |
862 | goto end; | |
e6c12e3d | 863 | |
6ddc916d MD |
864 | if (event->desc->u.ext.model_emf_uri) { |
865 | ret = lttng_metadata_printf(session, | |
866 | " model.emf.uri = \"%s\";\n", | |
867 | *(event->desc->u.ext.model_emf_uri)); | |
868 | if (ret) | |
869 | goto end; | |
870 | } | |
871 | ||
8020ceb5 MD |
872 | if (event->ctx) { |
873 | ret = lttng_metadata_printf(session, | |
874 | " context := struct {\n"); | |
875 | if (ret) | |
876 | goto end; | |
877 | } | |
7dd08bec | 878 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8020ceb5 MD |
879 | if (ret) |
880 | goto end; | |
881 | if (event->ctx) { | |
882 | ret = lttng_metadata_printf(session, | |
883 | " };\n"); | |
884 | if (ret) | |
885 | goto end; | |
886 | } | |
887 | ||
888 | ret = lttng_metadata_printf(session, | |
889 | " fields := struct {\n" | |
890 | ); | |
891 | if (ret) | |
892 | goto end; | |
893 | ||
7dd08bec | 894 | ret = _lttng_fields_metadata_statedump(session, event); |
8020ceb5 MD |
895 | if (ret) |
896 | goto end; | |
897 | ||
898 | /* | |
899 | * LTTng space reservation can only reserve multiples of the | |
900 | * byte size. | |
901 | */ | |
902 | ret = lttng_metadata_printf(session, | |
903 | " };\n" | |
904 | "};\n\n"); | |
905 | if (ret) | |
906 | goto end; | |
907 | ||
908 | event->metadata_dumped = 1; | |
909 | end: | |
910 | return ret; | |
911 | ||
912 | } | |
913 | ||
914 | static | |
7dd08bec MD |
915 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
916 | struct lttng_channel *chan) | |
8020ceb5 MD |
917 | { |
918 | int ret = 0; | |
919 | ||
b5234c06 | 920 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
921 | return 0; |
922 | if (chan == session->metadata) | |
923 | return 0; | |
924 | ||
925 | WARN_ON_ONCE(!chan->header_type); | |
926 | ret = lttng_metadata_printf(session, | |
927 | "stream {\n" | |
928 | " id = %u;\n" | |
929 | " event.header := %s;\n" | |
930 | " packet.context := struct packet_context;\n", | |
931 | chan->id, | |
932 | chan->header_type == 1 ? "struct event_header_compact" : | |
933 | "struct event_header_large"); | |
934 | if (ret) | |
935 | goto end; | |
936 | ||
937 | if (chan->ctx) { | |
938 | ret = lttng_metadata_printf(session, | |
939 | " event.context := struct {\n"); | |
940 | if (ret) | |
941 | goto end; | |
942 | } | |
7dd08bec | 943 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8020ceb5 MD |
944 | if (ret) |
945 | goto end; | |
946 | if (chan->ctx) { | |
947 | ret = lttng_metadata_printf(session, | |
948 | " };\n"); | |
949 | if (ret) | |
950 | goto end; | |
951 | } | |
952 | ||
953 | ret = lttng_metadata_printf(session, | |
954 | "};\n\n"); | |
955 | ||
956 | chan->metadata_dumped = 1; | |
957 | end: | |
958 | return ret; | |
959 | } | |
960 | ||
961 | static | |
7dd08bec | 962 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
8020ceb5 MD |
963 | { |
964 | return lttng_metadata_printf(session, | |
965 | "struct packet_context {\n" | |
28b12049 MD |
966 | " uint64_clock_monotonic_t timestamp_begin;\n" |
967 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
968 | " uint64_t content_size;\n" |
969 | " uint64_t packet_size;\n" | |
18fc8d71 | 970 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
971 | " uint32_t cpu_id;\n" |
972 | "};\n\n" | |
973 | ); | |
974 | } | |
975 | ||
976 | /* | |
977 | * Compact header: | |
978 | * id: range: 0 - 30. | |
979 | * id 31 is reserved to indicate an extended header. | |
980 | * | |
981 | * Large header: | |
982 | * id: range: 0 - 65534. | |
983 | * id 65535 is reserved to indicate an extended header. | |
984 | */ | |
985 | static | |
7dd08bec | 986 | int _lttng_event_header_declare(struct lttng_session *session) |
8020ceb5 MD |
987 | { |
988 | return lttng_metadata_printf(session, | |
989 | "struct event_header_compact {\n" | |
990 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
991 | " variant <id> {\n" | |
992 | " struct {\n" | |
28b12049 | 993 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
994 | " } compact;\n" |
995 | " struct {\n" | |
996 | " uint32_t id;\n" | |
28b12049 | 997 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
998 | " } extended;\n" |
999 | " } v;\n" | |
1000 | "} align(%u);\n" | |
1001 | "\n" | |
1002 | "struct event_header_large {\n" | |
1003 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1004 | " variant <id> {\n" | |
1005 | " struct {\n" | |
28b12049 | 1006 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1007 | " } compact;\n" |
1008 | " struct {\n" | |
1009 | " uint32_t id;\n" | |
28b12049 | 1010 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1011 | " } extended;\n" |
1012 | " } v;\n" | |
1013 | "} align(%u);\n\n", | |
1dbfff0c MD |
1014 | lttng_alignof(uint32_t) * CHAR_BIT, |
1015 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1016 | ); |
1017 | } | |
1018 | ||
28b12049 MD |
1019 | /* |
1020 | * Approximation of NTP time of day to clock monotonic correlation, | |
1021 | * taken at start of trace. | |
1022 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1023 | * in future versions. | |
1024 | */ | |
1025 | static | |
1026 | uint64_t measure_clock_offset(void) | |
1027 | { | |
1028 | uint64_t offset, monotonic[2], realtime; | |
1029 | struct timespec rts = { 0, 0 }; | |
1030 | int ret; | |
1031 | ||
1032 | monotonic[0] = trace_clock_read64(); | |
1033 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1034 | if (ret < 0) | |
1035 | return 0; | |
1036 | monotonic[1] = trace_clock_read64(); | |
1037 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1038 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1039 | realtime += rts.tv_nsec; |
1040 | offset = realtime - offset; | |
1041 | return offset; | |
1042 | } | |
1043 | ||
8020ceb5 MD |
1044 | /* |
1045 | * Output metadata into this session's metadata buffers. | |
1046 | */ | |
1047 | static | |
7dd08bec | 1048 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
8020ceb5 | 1049 | { |
74d81a6c | 1050 | unsigned char *uuid_c; |
19d8b1b3 MD |
1051 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1052 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
7dd08bec MD |
1053 | struct lttng_channel *chan; |
1054 | struct lttng_event *event; | |
8020ceb5 | 1055 | int ret = 0; |
08114193 | 1056 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1057 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1058 | |
b5234c06 | 1059 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1060 | return 0; |
1061 | if (session->metadata_dumped) | |
1062 | goto skip_session; | |
1063 | if (!session->metadata) { | |
b5234c06 | 1064 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1065 | return -EPERM; |
1066 | } | |
74d81a6c | 1067 | uuid_c = session->metadata->uuid; |
8020ceb5 MD |
1068 | |
1069 | snprintf(uuid_s, sizeof(uuid_s), | |
1070 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1071 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1072 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1073 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1074 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1075 | ||
1076 | ret = lttng_metadata_printf(session, | |
1077 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1078 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1079 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1080 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1081 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1082 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1083 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1084 | "\n" | |
1085 | "trace {\n" | |
1086 | " major = %u;\n" | |
1087 | " minor = %u;\n" | |
1088 | " uuid = \"%s\";\n" | |
1089 | " byte_order = %s;\n" | |
1090 | " packet.header := struct {\n" | |
1091 | " uint32_t magic;\n" | |
1092 | " uint8_t uuid[16];\n" | |
1093 | " uint32_t stream_id;\n" | |
1094 | " };\n" | |
1095 | "};\n\n", | |
1dbfff0c MD |
1096 | lttng_alignof(uint8_t) * CHAR_BIT, |
1097 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1098 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1099 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1100 | sizeof(unsigned long) * CHAR_BIT, |
1101 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1102 | CTF_SPEC_MAJOR, |
1103 | CTF_SPEC_MINOR, | |
8020ceb5 | 1104 | uuid_s, |
8a98a75d | 1105 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1106 | "be" |
1107 | #else | |
1108 | "le" | |
1109 | #endif | |
1110 | ); | |
1111 | if (ret) | |
1112 | goto end; | |
1113 | ||
b020e504 | 1114 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1115 | hostname[0] = '\0'; |
1116 | ret = gethostname(hostname, sizeof(hostname)); | |
1117 | if (ret && errno == ENAMETOOLONG) | |
1118 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1119 | lttng_ust_getprocname(procname); |
1120 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1121 | ret = lttng_metadata_printf(session, |
1122 | "env {\n" | |
9e4d42a0 | 1123 | " hostname = \"%s\";\n" |
b020e504 MD |
1124 | " vpid = %d;\n" |
1125 | " procname = \"%s\";\n" | |
2694975d MD |
1126 | " domain = \"ust\";\n" |
1127 | " tracer_name = \"lttng-ust\";\n" | |
1128 | " tracer_major = %u;\n" | |
1129 | " tracer_minor = %u;\n" | |
1130 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1131 | "};\n\n", |
9e4d42a0 | 1132 | hostname, |
b020e504 MD |
1133 | (int) getpid(), |
1134 | procname, | |
2694975d MD |
1135 | LTTNG_UST_MAJOR_VERSION, |
1136 | LTTNG_UST_MINOR_VERSION, | |
1137 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1138 | ); |
1139 | if (ret) | |
1140 | goto end; | |
1141 | ||
28b12049 MD |
1142 | ret = lttng_metadata_printf(session, |
1143 | "clock {\n" | |
939950af MD |
1144 | " name = %s;\n", |
1145 | "monotonic" | |
1146 | ); | |
1147 | if (ret) | |
1148 | goto end; | |
1149 | ||
1150 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1151 | ret = lttng_metadata_printf(session, | |
1152 | " uuid = \"%s\";\n", | |
1153 | clock_uuid_s | |
1154 | ); | |
1155 | if (ret) | |
1156 | goto end; | |
1157 | } | |
1158 | ||
1159 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1160 | " description = \"Monotonic Clock\";\n" |
1161 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1162 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1163 | " offset = %" PRIu64 ";\n" | |
1164 | "};\n\n", | |
28b12049 MD |
1165 | trace_clock_freq(), |
1166 | measure_clock_offset() | |
1167 | ); | |
1168 | if (ret) | |
1169 | goto end; | |
1170 | ||
1171 | ret = lttng_metadata_printf(session, | |
1172 | "typealias integer {\n" | |
1173 | " size = 27; align = 1; signed = false;\n" | |
1174 | " map = clock.monotonic.value;\n" | |
1175 | "} := uint27_clock_monotonic_t;\n" | |
1176 | "\n" | |
1177 | "typealias integer {\n" | |
1178 | " size = 32; align = %u; signed = false;\n" | |
1179 | " map = clock.monotonic.value;\n" | |
1180 | "} := uint32_clock_monotonic_t;\n" | |
1181 | "\n" | |
1182 | "typealias integer {\n" | |
1183 | " size = 64; align = %u; signed = false;\n" | |
1184 | " map = clock.monotonic.value;\n" | |
1185 | "} := uint64_clock_monotonic_t;\n\n", | |
1186 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1187 | lttng_alignof(uint64_t) * CHAR_BIT | |
1188 | ); | |
1189 | if (ret) | |
1190 | goto end; | |
1191 | ||
7dd08bec | 1192 | ret = _lttng_stream_packet_context_declare(session); |
8020ceb5 MD |
1193 | if (ret) |
1194 | goto end; | |
1195 | ||
7dd08bec | 1196 | ret = _lttng_event_header_declare(session); |
8020ceb5 MD |
1197 | if (ret) |
1198 | goto end; | |
1199 | ||
1200 | skip_session: | |
e58095ef | 1201 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
7dd08bec | 1202 | ret = _lttng_channel_metadata_statedump(session, chan); |
8020ceb5 MD |
1203 | if (ret) |
1204 | goto end; | |
1205 | } | |
1206 | ||
e58095ef | 1207 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 1208 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
8020ceb5 MD |
1209 | if (ret) |
1210 | goto end; | |
1211 | } | |
1212 | session->metadata_dumped = 1; | |
1213 | end: | |
1214 | return ret; | |
1215 | } | |
1216 | ||
003fedf4 | 1217 | void lttng_ust_events_exit(void) |
8020ceb5 | 1218 | { |
7dd08bec | 1219 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1220 | |
e58095ef | 1221 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1222 | lttng_session_destroy(session); |
8020ceb5 | 1223 | } |
457a6b58 | 1224 | |
e58095ef MD |
1225 | /* |
1226 | * Enabler management. | |
1227 | */ | |
1228 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1229 | struct lttng_ust_event *event_param, | |
1230 | struct lttng_channel *chan) | |
457a6b58 | 1231 | { |
e58095ef MD |
1232 | struct lttng_enabler *enabler; |
1233 | ||
1234 | enabler = zmalloc(sizeof(*enabler)); | |
1235 | if (!enabler) | |
1236 | return NULL; | |
1237 | enabler->type = type; | |
1238 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
1239 | memcpy(&enabler->event_param, event_param, | |
1240 | sizeof(enabler->event_param)); | |
1241 | enabler->chan = chan; | |
1242 | /* ctx left NULL */ | |
1243 | enabler->enabled = 1; | |
1244 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1245 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1246 | return enabler; | |
457a6b58 MD |
1247 | } |
1248 | ||
e58095ef | 1249 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1250 | { |
e58095ef MD |
1251 | enabler->enabled = 1; |
1252 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1253 | return 0; | |
457a6b58 | 1254 | } |
457a6b58 | 1255 | |
e58095ef | 1256 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1257 | { |
e58095ef MD |
1258 | if (enabler->chan == enabler->chan->session->metadata) |
1259 | return -EPERM; | |
1260 | enabler->enabled = 0; | |
1261 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1262 | return 0; | |
1263 | } | |
457a6b58 | 1264 | |
e58095ef MD |
1265 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1266 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1267 | { | |
1268 | bytecode->enabler = enabler; | |
1269 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1270 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1271 | return 0; | |
1272 | } | |
f488575f | 1273 | |
e58095ef MD |
1274 | int lttng_attach_context(struct lttng_ust_context *context_param, |
1275 | struct lttng_ctx **ctx, struct lttng_session *session) | |
1276 | { | |
457a6b58 | 1277 | /* |
e58095ef MD |
1278 | * We cannot attach a context after trace has been started for a |
1279 | * session because the metadata does not allow expressing this | |
1280 | * information outside of the original channel scope. | |
457a6b58 | 1281 | */ |
e58095ef MD |
1282 | if (session->been_active) |
1283 | return -EPERM; | |
457a6b58 | 1284 | |
e58095ef MD |
1285 | switch (context_param->ctx) { |
1286 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1287 | return lttng_add_pthread_id_to_ctx(ctx); | |
1288 | case LTTNG_UST_CONTEXT_VTID: | |
1289 | return lttng_add_vtid_to_ctx(ctx); | |
1290 | case LTTNG_UST_CONTEXT_VPID: | |
1291 | return lttng_add_vpid_to_ctx(ctx); | |
1292 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1293 | return lttng_add_procname_to_ctx(ctx); | |
1294 | default: | |
1295 | return -EINVAL; | |
457a6b58 | 1296 | } |
457a6b58 MD |
1297 | } |
1298 | ||
e58095ef MD |
1299 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1300 | struct lttng_ust_context *context_param) | |
457a6b58 | 1301 | { |
e58095ef MD |
1302 | #if 0 // disabled for now. |
1303 | struct lttng_session *session = enabler->chan->session; | |
1304 | int ret; | |
457a6b58 | 1305 | |
e58095ef MD |
1306 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1307 | session); | |
1308 | if (ret) | |
1309 | return ret; | |
1310 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1311 | #endif | |
1312 | return -ENOSYS; | |
457a6b58 MD |
1313 | } |
1314 | ||
e58095ef MD |
1315 | static |
1316 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1317 | { |
e58095ef | 1318 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
457a6b58 | 1319 | |
e58095ef MD |
1320 | /* Destroy filter bytecode */ |
1321 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1322 | &enabler->filter_bytecode_head, node) { | |
1323 | free(filter_node); | |
457a6b58 | 1324 | } |
e58095ef MD |
1325 | |
1326 | /* Destroy contexts */ | |
1327 | lttng_destroy_context(enabler->ctx); | |
1328 | ||
1329 | cds_list_del(&enabler->node); | |
1330 | free(enabler); | |
457a6b58 MD |
1331 | } |
1332 | ||
e58095ef MD |
1333 | /* |
1334 | * lttng_session_sync_enablers should be called just before starting a | |
1335 | * session. | |
1336 | */ | |
457a6b58 | 1337 | static |
e58095ef | 1338 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1339 | { |
e58095ef MD |
1340 | struct lttng_enabler *enabler; |
1341 | struct lttng_event *event; | |
457a6b58 | 1342 | |
e58095ef MD |
1343 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1344 | lttng_enabler_ref_events(enabler); | |
1345 | /* | |
1346 | * For each event, if at least one of its enablers is enabled, | |
1347 | * we enable the event, else we disable it. | |
1348 | */ | |
1349 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1350 | struct lttng_enabler_ref *enabler_ref; | |
1351 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1352 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1353 | |
1354 | /* Enable events */ | |
1355 | cds_list_for_each_entry(enabler_ref, | |
1356 | &event->enablers_ref_head, node) { | |
1357 | if (enabler_ref->ref->enabled) { | |
1358 | enabled = 1; | |
1359 | break; | |
1360 | } | |
1361 | } | |
1362 | event->enabled = enabled; | |
457a6b58 | 1363 | |
1f49fc05 | 1364 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1365 | cds_list_for_each_entry(enabler_ref, |
1366 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1367 | if (enabler_ref->ref->enabled |
1368 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1369 | has_enablers_without_bytecode = 1; |
1370 | break; | |
1371 | } | |
1372 | } | |
1373 | event->has_enablers_without_bytecode = | |
1374 | has_enablers_without_bytecode; | |
1375 | ||
e58095ef MD |
1376 | /* Enable filters */ |
1377 | cds_list_for_each_entry(runtime, | |
1378 | &event->bytecode_runtime_head, node) { | |
1379 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1380 | } |
1381 | } | |
457a6b58 MD |
1382 | } |
1383 | ||
e58095ef MD |
1384 | /* |
1385 | * Apply enablers to session events, adding events to session if need | |
1386 | * be. It is required after each modification applied to an active | |
1387 | * session, and right before session "start". | |
1388 | * "lazy" sync means we only sync if required. | |
1389 | */ | |
1390 | static | |
1391 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1392 | { |
e58095ef MD |
1393 | /* We can skip if session is not active */ |
1394 | if (!session->active) | |
1395 | return; | |
1396 | lttng_session_sync_enablers(session); | |
457a6b58 | 1397 | } |