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 | ||
6715d7d1 MD |
94 | /* |
95 | * Called with ust lock held. | |
96 | */ | |
97 | int lttng_session_active(void) | |
98 | { | |
99 | struct lttng_session *iter; | |
100 | ||
101 | cds_list_for_each_entry(iter, &sessions, node) { | |
102 | if (iter->active) | |
103 | return 1; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
e58095ef MD |
108 | static |
109 | int lttng_loglevel_match(int loglevel, | |
110 | unsigned int has_loglevel, | |
457a6b58 MD |
111 | enum lttng_ust_loglevel_type req_type, |
112 | int req_loglevel) | |
113 | { | |
457a6b58 MD |
114 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) |
115 | return 1; | |
e58095ef MD |
116 | if (!has_loglevel) |
117 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
118 | switch (req_type) { |
119 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e58095ef | 120 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
121 | return 1; |
122 | else | |
123 | return 0; | |
124 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 125 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
129 | case LTTNG_UST_LOGLEVEL_ALL: | |
130 | default: | |
131 | return 1; | |
132 | } | |
133 | } | |
134 | ||
8020ceb5 MD |
135 | void synchronize_trace(void) |
136 | { | |
8020ceb5 | 137 | synchronize_rcu(); |
8020ceb5 MD |
138 | } |
139 | ||
7dd08bec | 140 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 141 | { |
7dd08bec | 142 | struct lttng_session *session; |
74d81a6c | 143 | int i; |
8020ceb5 | 144 | |
7dd08bec | 145 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
146 | if (!session) |
147 | return NULL; | |
e58095ef MD |
148 | CDS_INIT_LIST_HEAD(&session->chan_head); |
149 | CDS_INIT_LIST_HEAD(&session->events_head); | |
150 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
d56fa719 MD |
151 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
152 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
e58095ef | 153 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
154 | return session; |
155 | } | |
156 | ||
74d81a6c MD |
157 | /* |
158 | * Only used internally at session destruction. | |
159 | */ | |
160 | static | |
161 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
162 | { | |
163 | struct channel *chan; | |
164 | struct lttng_ust_shm_handle *handle; | |
165 | ||
166 | cds_list_del(<tng_chan->node); | |
167 | lttng_destroy_context(lttng_chan->ctx); | |
168 | chan = lttng_chan->chan; | |
169 | handle = lttng_chan->handle; | |
170 | /* | |
171 | * note: lttng_chan is private data contained within handle. It | |
172 | * will be freed along with the handle. | |
173 | */ | |
174 | channel_destroy(chan, handle, 0); | |
175 | } | |
176 | ||
7dd08bec | 177 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 178 | { |
7dd08bec MD |
179 | struct lttng_channel *chan, *tmpchan; |
180 | struct lttng_event *event, *tmpevent; | |
e58095ef | 181 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 MD |
182 | int ret; |
183 | ||
b5234c06 | 184 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 185 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 186 | ret = _lttng_event_unregister(event); |
8020ceb5 MD |
187 | WARN_ON(ret); |
188 | } | |
189 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
190 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
191 | &session->enablers_head, node) | |
192 | lttng_enabler_destroy(enabler); | |
193 | cds_list_for_each_entry_safe(event, tmpevent, | |
194 | &session->events_head, node) | |
7dd08bec | 195 | _lttng_event_destroy(event); |
e58095ef | 196 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 197 | _lttng_channel_unmap(chan); |
e58095ef | 198 | cds_list_del(&session->node); |
b5234c06 | 199 | free(session); |
8020ceb5 MD |
200 | } |
201 | ||
7dd08bec | 202 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
203 | { |
204 | int ret = 0; | |
7dd08bec | 205 | struct lttng_channel *chan; |
8020ceb5 | 206 | |
8020ceb5 MD |
207 | if (session->active) { |
208 | ret = -EBUSY; | |
209 | goto end; | |
210 | } | |
211 | ||
e58095ef MD |
212 | /* We need to sync enablers with session before activation. */ |
213 | lttng_session_sync_enablers(session); | |
214 | ||
8020ceb5 MD |
215 | /* |
216 | * Snapshot the number of events per channel to know the type of header | |
217 | * we need to use. | |
218 | */ | |
e58095ef | 219 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
8020ceb5 MD |
220 | if (chan->header_type) |
221 | continue; /* don't change it if session stop/restart */ | |
222 | if (chan->free_event_id < 31) | |
223 | chan->header_type = 1; /* compact */ | |
224 | else | |
225 | chan->header_type = 2; /* large */ | |
226 | } | |
227 | ||
b5234c06 MD |
228 | CMM_ACCESS_ONCE(session->active) = 1; |
229 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
7dd08bec | 230 | ret = _lttng_session_metadata_statedump(session); |
4b4de73e | 231 | if (ret) |
b5234c06 | 232 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 233 | end: |
8020ceb5 MD |
234 | return ret; |
235 | } | |
236 | ||
7dd08bec | 237 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
238 | { |
239 | int ret = 0; | |
240 | ||
8020ceb5 MD |
241 | if (!session->active) { |
242 | ret = -EBUSY; | |
243 | goto end; | |
244 | } | |
b5234c06 | 245 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 246 | end: |
8020ceb5 MD |
247 | return ret; |
248 | } | |
249 | ||
7dd08bec | 250 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea MD |
251 | { |
252 | int old; | |
253 | ||
9beb36ba MD |
254 | if (channel == channel->session->metadata) |
255 | return -EPERM; | |
b5234c06 | 256 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
257 | if (old) |
258 | return -EEXIST; | |
259 | return 0; | |
260 | } | |
261 | ||
7dd08bec | 262 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea MD |
263 | { |
264 | int old; | |
265 | ||
9beb36ba MD |
266 | if (channel == channel->session->metadata) |
267 | return -EPERM; | |
b5234c06 | 268 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
269 | if (!old) |
270 | return -EEXIST; | |
271 | return 0; | |
272 | } | |
273 | ||
7dd08bec | 274 | int lttng_event_enable(struct lttng_event *event) |
976fe9ea MD |
275 | { |
276 | int old; | |
277 | ||
9beb36ba MD |
278 | if (event->chan == event->chan->session->metadata) |
279 | return -EPERM; | |
b5234c06 | 280 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
281 | if (old) |
282 | return -EEXIST; | |
283 | return 0; | |
284 | } | |
285 | ||
7dd08bec | 286 | int lttng_event_disable(struct lttng_event *event) |
976fe9ea MD |
287 | { |
288 | int old; | |
289 | ||
9beb36ba MD |
290 | if (event->chan == event->chan->session->metadata) |
291 | return -EPERM; | |
b5234c06 | 292 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
293 | if (!old) |
294 | return -EEXIST; | |
295 | return 0; | |
296 | } | |
297 | ||
8020ceb5 MD |
298 | /* |
299 | * Supports event creation while tracing session is active. | |
300 | */ | |
e58095ef MD |
301 | static |
302 | int lttng_event_create(const struct lttng_event_desc *desc, | |
303 | struct lttng_channel *chan) | |
8020ceb5 | 304 | { |
e58095ef | 305 | const char *event_name = desc->name; |
7dd08bec | 306 | struct lttng_event *event; |
d56fa719 MD |
307 | struct cds_hlist_head *head; |
308 | struct cds_hlist_node *node; | |
576599a0 | 309 | int ret = 0; |
d56fa719 MD |
310 | size_t name_len = strlen(event_name); |
311 | uint32_t hash; | |
8020ceb5 | 312 | |
38eb0baa | 313 | if (chan->used_event_id == -1U) { |
576599a0 | 314 | ret = -ENOMEM; |
8020ceb5 | 315 | goto full; |
576599a0 | 316 | } |
d56fa719 MD |
317 | hash = jhash(event_name, name_len, 0); |
318 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
319 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
320 | assert(event->desc); |
321 | if (!strncmp(event->desc->name, | |
322 | desc->name, | |
ff412fb5 | 323 | LTTNG_UST_SYM_NAME_LEN - 1)) { |
576599a0 | 324 | ret = -EEXIST; |
8020ceb5 | 325 | goto exist; |
576599a0 MD |
326 | } |
327 | } | |
457a6b58 MD |
328 | |
329 | /* | |
330 | * Check if loglevel match. Refuse to connect event if not. | |
331 | */ | |
7dd08bec | 332 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
333 | if (!event) { |
334 | ret = -ENOMEM; | |
8020ceb5 | 335 | goto cache_error; |
576599a0 | 336 | } |
8020ceb5 | 337 | event->chan = chan; |
e58095ef | 338 | |
8165c8da MD |
339 | /* |
340 | * used_event_id counts the maximum number of event IDs that can | |
341 | * register if all probes register. | |
342 | */ | |
343 | chan->used_event_id++; | |
976fe9ea | 344 | event->enabled = 1; |
e58095ef MD |
345 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
346 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
347 | event->desc = desc; | |
7dd08bec | 348 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 349 | cmm_smp_wmb(); |
e58095ef MD |
350 | ret = __tracepoint_probe_register(event_name, |
351 | desc->probe_callback, | |
352 | event, desc->signature); | |
353 | if (ret) | |
354 | goto register_error; | |
355 | event->id = chan->free_event_id++; | |
356 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); | |
357 | if (ret) | |
358 | goto statedump_error; | |
359 | cds_list_add(&event->node, &chan->session->events_head); | |
d56fa719 | 360 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 361 | return 0; |
8020ceb5 MD |
362 | |
363 | statedump_error: | |
e58095ef MD |
364 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_name, |
365 | desc->probe_callback, | |
366 | event)); | |
8020ceb5 | 367 | register_error: |
b5234c06 | 368 | free(event); |
8020ceb5 MD |
369 | cache_error: |
370 | exist: | |
371 | full: | |
576599a0 | 372 | return ret; |
8020ceb5 MD |
373 | } |
374 | ||
e58095ef MD |
375 | static |
376 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
377 | struct lttng_enabler *enabler) | |
378 | { | |
379 | int loglevel = 0; | |
380 | unsigned int has_loglevel; | |
381 | ||
382 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
383 | /* Compare excluding final '*' */ | |
384 | if (strncmp(desc->name, enabler->event_param.name, | |
385 | strlen(enabler->event_param.name) - 1)) | |
386 | return 0; | |
387 | if (desc->loglevel) { | |
388 | loglevel = *(*desc->loglevel); | |
389 | has_loglevel = 1; | |
390 | } | |
391 | if (!lttng_loglevel_match(loglevel, | |
392 | has_loglevel, | |
393 | enabler->event_param.loglevel_type, | |
394 | enabler->event_param.loglevel)) | |
395 | return 0; | |
396 | return 1; | |
397 | } | |
398 | ||
399 | static | |
400 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
401 | struct lttng_enabler *enabler) | |
402 | { | |
403 | int loglevel = 0; | |
404 | unsigned int has_loglevel = 0; | |
405 | ||
406 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
407 | if (strcmp(desc->name, enabler->event_param.name)) | |
408 | return 0; | |
409 | if (desc->loglevel) { | |
410 | loglevel = *(*desc->loglevel); | |
411 | has_loglevel = 1; | |
412 | } | |
413 | if (!lttng_loglevel_match(loglevel, | |
414 | has_loglevel, | |
415 | enabler->event_param.loglevel_type, | |
416 | enabler->event_param.loglevel)) | |
417 | return 0; | |
418 | return 1; | |
419 | } | |
420 | ||
421 | static | |
422 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
423 | struct lttng_enabler *enabler) | |
424 | { | |
425 | switch (enabler->type) { | |
426 | case LTTNG_ENABLER_WILDCARD: | |
427 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
428 | case LTTNG_ENABLER_EVENT: | |
429 | return lttng_desc_match_event_enabler(desc, enabler); | |
430 | default: | |
431 | return -EINVAL; | |
432 | } | |
433 | } | |
434 | ||
435 | static | |
436 | int lttng_event_match_enabler(struct lttng_event *event, | |
437 | struct lttng_enabler *enabler) | |
438 | { | |
439 | return lttng_desc_match_enabler(event->desc, enabler); | |
440 | } | |
441 | ||
442 | static | |
443 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
444 | struct lttng_enabler *enabler) | |
445 | { | |
446 | struct lttng_enabler_ref *enabler_ref; | |
447 | ||
448 | cds_list_for_each_entry(enabler_ref, | |
449 | &event->enablers_ref_head, node) { | |
450 | if (enabler_ref->ref == enabler) | |
451 | return enabler_ref; | |
452 | } | |
453 | return NULL; | |
454 | } | |
455 | ||
8020ceb5 | 456 | /* |
e58095ef MD |
457 | * Create struct lttng_event if it is missing and present in the list of |
458 | * tracepoint probes. | |
8020ceb5 | 459 | */ |
e58095ef MD |
460 | static |
461 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 462 | { |
e58095ef MD |
463 | struct lttng_session *session = enabler->chan->session; |
464 | struct lttng_probe_desc *probe_desc; | |
465 | const struct lttng_event_desc *desc; | |
466 | struct lttng_event *event; | |
467 | int i; | |
468 | struct cds_list_head *probe_list; | |
469 | ||
470 | probe_list = lttng_get_probe_list_head(); | |
471 | /* | |
472 | * For each probe event, if we find that a probe event matches | |
473 | * our enabler, create an associated lttng_event if not | |
474 | * already present. | |
475 | */ | |
476 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
477 | for (i = 0; i < probe_desc->nr_events; i++) { | |
478 | int found = 0, ret; | |
d56fa719 MD |
479 | struct cds_hlist_head *head; |
480 | struct cds_hlist_node *node; | |
481 | const char *event_name; | |
482 | size_t name_len; | |
483 | uint32_t hash; | |
e58095ef MD |
484 | |
485 | desc = probe_desc->event_desc[i]; | |
486 | if (!lttng_desc_match_enabler(desc, enabler)) | |
487 | continue; | |
d56fa719 MD |
488 | event_name = desc->name; |
489 | name_len = strlen(event_name); | |
e58095ef MD |
490 | |
491 | /* | |
d56fa719 | 492 | * Check if already created. |
e58095ef | 493 | */ |
d56fa719 MD |
494 | hash = jhash(event_name, name_len, 0); |
495 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
496 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
497 | if (event->desc == desc) |
498 | found = 1; | |
499 | } | |
500 | if (found) | |
501 | continue; | |
502 | ||
503 | /* | |
504 | * We need to create an event for this | |
505 | * event probe. | |
506 | */ | |
507 | ret = lttng_event_create(probe_desc->event_desc[i], | |
508 | enabler->chan); | |
509 | if (ret) { | |
510 | DBG("Unable to create event %s\n", | |
511 | probe_desc->event_desc[i]->name); | |
512 | } | |
8165c8da | 513 | } |
8020ceb5 | 514 | } |
8020ceb5 MD |
515 | } |
516 | ||
517 | /* | |
e58095ef MD |
518 | * Create events associated with an enabler (if not already present), |
519 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
520 | */ |
521 | static | |
e58095ef | 522 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 523 | { |
e58095ef MD |
524 | struct lttng_session *session = enabler->chan->session; |
525 | struct lttng_event *event; | |
526 | ||
527 | /* First ensure that probe events are created for this enabler. */ | |
528 | lttng_create_event_if_missing(enabler); | |
529 | ||
530 | /* For each event matching enabler in session event list. */ | |
531 | cds_list_for_each_entry(event, &session->events_head, node) { | |
532 | struct lttng_enabler_ref *enabler_ref; | |
533 | ||
534 | if (!lttng_event_match_enabler(event, enabler)) | |
535 | continue; | |
536 | ||
537 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
538 | if (!enabler_ref) { | |
539 | /* | |
540 | * If no backward ref, create it. | |
541 | * Add backward ref from event to enabler. | |
542 | */ | |
543 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
544 | if (!enabler_ref) | |
545 | return -ENOMEM; | |
546 | enabler_ref->ref = enabler; | |
547 | cds_list_add(&enabler_ref->node, | |
548 | &event->enablers_ref_head); | |
8165c8da | 549 | } |
e58095ef MD |
550 | |
551 | /* | |
552 | * Link filter bytecodes if not linked yet. | |
553 | */ | |
554 | lttng_enabler_event_link_bytecode(event, enabler); | |
555 | ||
556 | /* TODO: merge event context. */ | |
557 | } | |
558 | return 0; | |
559 | } | |
560 | ||
561 | /* | |
562 | * Called at library load: connect the probe on all enablers matching | |
563 | * this event. | |
564 | * called with session mutex held. | |
565 | * TODO: currently, for each desc added, we iterate on all event desc | |
566 | * (inefficient). We should create specific code that only target the | |
567 | * added desc. | |
568 | */ | |
569 | int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc) | |
570 | { | |
571 | struct lttng_session *session; | |
572 | ||
573 | cds_list_for_each_entry(session, &sessions, node) { | |
574 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 575 | } |
e58095ef MD |
576 | return 0; |
577 | } | |
578 | ||
579 | /* | |
580 | * Only used internally at session destruction. | |
581 | */ | |
582 | int _lttng_event_unregister(struct lttng_event *event) | |
583 | { | |
584 | return __tracepoint_probe_unregister(event->desc->name, | |
585 | event->desc->probe_callback, | |
586 | event); | |
587 | } | |
588 | ||
589 | /* | |
590 | * Only used internally at session destruction. | |
591 | */ | |
592 | static | |
593 | void _lttng_event_destroy(struct lttng_event *event) | |
594 | { | |
595 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
596 | ||
e58095ef | 597 | cds_list_del(&event->node); |
8020ceb5 | 598 | lttng_destroy_context(event->ctx); |
f488575f | 599 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
600 | /* Free event enabler refs */ |
601 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
602 | &event->enablers_ref_head, node) | |
603 | free(enabler_ref); | |
b5234c06 | 604 | free(event); |
8020ceb5 MD |
605 | } |
606 | ||
607 | /* | |
608 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 609 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
610 | * remaining space left in packet and write, since mutual exclusion |
611 | * protects us from concurrent writes. | |
612 | */ | |
7dd08bec | 613 | int lttng_metadata_printf(struct lttng_session *session, |
8020ceb5 MD |
614 | const char *fmt, ...) |
615 | { | |
4cfec15c | 616 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
7dd08bec | 617 | struct lttng_channel *chan = session->metadata; |
b5234c06 | 618 | char *str = NULL; |
8020ceb5 MD |
619 | int ret = 0, waitret; |
620 | size_t len, reserve_len, pos; | |
621 | va_list ap; | |
622 | ||
b5234c06 | 623 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
624 | |
625 | va_start(ap, fmt); | |
b5234c06 | 626 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 627 | va_end(ap); |
b5234c06 | 628 | if (ret < 0) |
8020ceb5 MD |
629 | return -ENOMEM; |
630 | ||
631 | len = strlen(str); | |
632 | pos = 0; | |
633 | ||
634 | for (pos = 0; pos < len; pos += reserve_len) { | |
635 | reserve_len = min_t(size_t, | |
1d498196 | 636 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
637 | len - pos); |
638 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 639 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
640 | /* |
641 | * We don't care about metadata buffer's records lost | |
642 | * count, because we always retry here. Report error if | |
643 | * we need to bail out after timeout or being | |
644 | * interrupted. | |
645 | */ | |
b5234c06 | 646 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
647 | ({ |
648 | ret = chan->ops->event_reserve(&ctx, 0); | |
649 | ret != -ENOBUFS || !ret; | |
650 | }), | |
b5234c06 | 651 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 652 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
653 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
654 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 655 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 656 | if (waitret == -EINTR) |
8020ceb5 MD |
657 | ret = waitret; |
658 | goto end; | |
659 | } | |
660 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
661 | chan->ops->event_commit(&ctx); | |
662 | } | |
663 | end: | |
b5234c06 | 664 | free(str); |
8020ceb5 MD |
665 | return ret; |
666 | } | |
667 | ||
668 | static | |
7dd08bec | 669 | int _lttng_field_statedump(struct lttng_session *session, |
8020ceb5 MD |
670 | const struct lttng_event_field *field) |
671 | { | |
672 | int ret = 0; | |
673 | ||
180901e6 | 674 | if (field->nowrite) |
4774c8f3 MD |
675 | return 0; |
676 | ||
8020ceb5 MD |
677 | switch (field->type.atype) { |
678 | case atype_integer: | |
679 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 680 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
681 | field->type.u.basic.integer.size, |
682 | field->type.u.basic.integer.alignment, | |
683 | field->type.u.basic.integer.signedness, | |
684 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
685 | ? "none" | |
686 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
687 | ? "UTF8" | |
688 | : "ASCII", | |
689 | field->type.u.basic.integer.base, | |
8a98a75d | 690 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
691 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
692 | #else | |
693 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
694 | #endif | |
695 | field->name); | |
696 | break; | |
697 | case atype_float: | |
698 | ret = lttng_metadata_printf(session, | |
8a98a75d | 699 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
700 | field->type.u.basic._float.exp_dig, |
701 | field->type.u.basic._float.mant_dig, | |
702 | field->type.u.basic._float.alignment, | |
8a98a75d | 703 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
704 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
705 | #else | |
706 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
707 | #endif | |
708 | field->name); | |
709 | break; | |
710 | case atype_enum: | |
711 | ret = lttng_metadata_printf(session, | |
712 | " %s %s;\n", | |
713 | field->type.u.basic.enumeration.name, | |
714 | field->name); | |
715 | break; | |
716 | case atype_array: | |
717 | { | |
718 | const struct lttng_basic_type *elem_type; | |
719 | ||
720 | elem_type = &field->type.u.array.elem_type; | |
721 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 722 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
723 | elem_type->u.basic.integer.size, |
724 | elem_type->u.basic.integer.alignment, | |
725 | elem_type->u.basic.integer.signedness, | |
726 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
727 | ? "none" | |
728 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
729 | ? "UTF8" | |
730 | : "ASCII", | |
731 | elem_type->u.basic.integer.base, | |
8a98a75d | 732 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
733 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
734 | #else | |
735 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
736 | #endif | |
737 | field->name, field->type.u.array.length); | |
738 | break; | |
739 | } | |
740 | case atype_sequence: | |
741 | { | |
742 | const struct lttng_basic_type *elem_type; | |
743 | const struct lttng_basic_type *length_type; | |
744 | ||
745 | elem_type = &field->type.u.sequence.elem_type; | |
746 | length_type = &field->type.u.sequence.length_type; | |
747 | ret = lttng_metadata_printf(session, | |
748 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
749 | length_type->u.basic.integer.size, | |
750 | (unsigned int) length_type->u.basic.integer.alignment, | |
751 | length_type->u.basic.integer.signedness, | |
752 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
753 | ? "none" | |
754 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
755 | ? "UTF8" | |
756 | : "ASCII"), | |
757 | length_type->u.basic.integer.base, | |
8a98a75d | 758 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
759 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
760 | #else | |
761 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
762 | #endif | |
763 | field->name); | |
764 | if (ret) | |
765 | return ret; | |
766 | ||
767 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 768 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
769 | elem_type->u.basic.integer.size, |
770 | (unsigned int) elem_type->u.basic.integer.alignment, | |
771 | elem_type->u.basic.integer.signedness, | |
772 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
773 | ? "none" | |
774 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
775 | ? "UTF8" | |
776 | : "ASCII"), | |
777 | elem_type->u.basic.integer.base, | |
8a98a75d | 778 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
779 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
780 | #else | |
781 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
782 | #endif | |
783 | field->name, | |
784 | field->name); | |
785 | break; | |
786 | } | |
787 | ||
788 | case atype_string: | |
789 | /* Default encoding is UTF8 */ | |
790 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 791 | " string%s _%s;\n", |
8020ceb5 MD |
792 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
793 | " { encoding = ASCII; }" : "", | |
794 | field->name); | |
795 | break; | |
796 | default: | |
797 | WARN_ON_ONCE(1); | |
798 | return -EINVAL; | |
799 | } | |
800 | return ret; | |
801 | } | |
802 | ||
803 | static | |
7dd08bec | 804 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8020ceb5 MD |
805 | struct lttng_ctx *ctx) |
806 | { | |
807 | int ret = 0; | |
808 | int i; | |
809 | ||
810 | if (!ctx) | |
811 | return 0; | |
812 | for (i = 0; i < ctx->nr_fields; i++) { | |
813 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
814 | ||
7dd08bec | 815 | ret = _lttng_field_statedump(session, &field->event_field); |
8020ceb5 MD |
816 | if (ret) |
817 | return ret; | |
818 | } | |
819 | return ret; | |
820 | } | |
821 | ||
822 | static | |
7dd08bec MD |
823 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
824 | struct lttng_event *event) | |
8020ceb5 MD |
825 | { |
826 | const struct lttng_event_desc *desc = event->desc; | |
827 | int ret = 0; | |
828 | int i; | |
829 | ||
830 | for (i = 0; i < desc->nr_fields; i++) { | |
831 | const struct lttng_event_field *field = &desc->fields[i]; | |
832 | ||
7dd08bec | 833 | ret = _lttng_field_statedump(session, field); |
8020ceb5 MD |
834 | if (ret) |
835 | return ret; | |
836 | } | |
837 | return ret; | |
838 | } | |
839 | ||
840 | static | |
7dd08bec MD |
841 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
842 | struct lttng_channel *chan, | |
843 | struct lttng_event *event) | |
8020ceb5 MD |
844 | { |
845 | int ret = 0; | |
8155c5e8 | 846 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 847 | |
b5234c06 | 848 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
849 | return 0; |
850 | if (chan == session->metadata) | |
851 | return 0; | |
8165c8da MD |
852 | /* |
853 | * Don't print events for which probe load is pending. | |
854 | */ | |
855 | if (!event->desc) | |
856 | return 0; | |
8020ceb5 MD |
857 | |
858 | ret = lttng_metadata_printf(session, | |
859 | "event {\n" | |
7083f0fe | 860 | " name = \"%s\";\n" |
8020ceb5 MD |
861 | " id = %u;\n" |
862 | " stream_id = %u;\n", | |
863 | event->desc->name, | |
864 | event->id, | |
865 | event->chan->id); | |
866 | if (ret) | |
867 | goto end; | |
868 | ||
8155c5e8 MD |
869 | if (event->desc->loglevel) |
870 | loglevel = *(*event->desc->loglevel); | |
871 | ||
872 | ret = lttng_metadata_printf(session, | |
873 | " loglevel = %d;\n", | |
874 | loglevel); | |
875 | if (ret) | |
876 | goto end; | |
e6c12e3d | 877 | |
6ddc916d MD |
878 | if (event->desc->u.ext.model_emf_uri) { |
879 | ret = lttng_metadata_printf(session, | |
880 | " model.emf.uri = \"%s\";\n", | |
881 | *(event->desc->u.ext.model_emf_uri)); | |
882 | if (ret) | |
883 | goto end; | |
884 | } | |
885 | ||
8020ceb5 MD |
886 | if (event->ctx) { |
887 | ret = lttng_metadata_printf(session, | |
888 | " context := struct {\n"); | |
889 | if (ret) | |
890 | goto end; | |
891 | } | |
7dd08bec | 892 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8020ceb5 MD |
893 | if (ret) |
894 | goto end; | |
895 | if (event->ctx) { | |
896 | ret = lttng_metadata_printf(session, | |
897 | " };\n"); | |
898 | if (ret) | |
899 | goto end; | |
900 | } | |
901 | ||
902 | ret = lttng_metadata_printf(session, | |
903 | " fields := struct {\n" | |
904 | ); | |
905 | if (ret) | |
906 | goto end; | |
907 | ||
7dd08bec | 908 | ret = _lttng_fields_metadata_statedump(session, event); |
8020ceb5 MD |
909 | if (ret) |
910 | goto end; | |
911 | ||
912 | /* | |
913 | * LTTng space reservation can only reserve multiples of the | |
914 | * byte size. | |
915 | */ | |
916 | ret = lttng_metadata_printf(session, | |
917 | " };\n" | |
918 | "};\n\n"); | |
919 | if (ret) | |
920 | goto end; | |
921 | ||
922 | event->metadata_dumped = 1; | |
923 | end: | |
924 | return ret; | |
925 | ||
926 | } | |
927 | ||
928 | static | |
7dd08bec MD |
929 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
930 | struct lttng_channel *chan) | |
8020ceb5 MD |
931 | { |
932 | int ret = 0; | |
933 | ||
b5234c06 | 934 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
935 | return 0; |
936 | if (chan == session->metadata) | |
937 | return 0; | |
938 | ||
939 | WARN_ON_ONCE(!chan->header_type); | |
940 | ret = lttng_metadata_printf(session, | |
941 | "stream {\n" | |
942 | " id = %u;\n" | |
943 | " event.header := %s;\n" | |
944 | " packet.context := struct packet_context;\n", | |
945 | chan->id, | |
946 | chan->header_type == 1 ? "struct event_header_compact" : | |
947 | "struct event_header_large"); | |
948 | if (ret) | |
949 | goto end; | |
950 | ||
951 | if (chan->ctx) { | |
952 | ret = lttng_metadata_printf(session, | |
953 | " event.context := struct {\n"); | |
954 | if (ret) | |
955 | goto end; | |
956 | } | |
7dd08bec | 957 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8020ceb5 MD |
958 | if (ret) |
959 | goto end; | |
960 | if (chan->ctx) { | |
961 | ret = lttng_metadata_printf(session, | |
962 | " };\n"); | |
963 | if (ret) | |
964 | goto end; | |
965 | } | |
966 | ||
967 | ret = lttng_metadata_printf(session, | |
968 | "};\n\n"); | |
969 | ||
970 | chan->metadata_dumped = 1; | |
971 | end: | |
972 | return ret; | |
973 | } | |
974 | ||
975 | static | |
7dd08bec | 976 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
8020ceb5 MD |
977 | { |
978 | return lttng_metadata_printf(session, | |
979 | "struct packet_context {\n" | |
28b12049 MD |
980 | " uint64_clock_monotonic_t timestamp_begin;\n" |
981 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
982 | " uint64_t content_size;\n" |
983 | " uint64_t packet_size;\n" | |
18fc8d71 | 984 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
985 | " uint32_t cpu_id;\n" |
986 | "};\n\n" | |
987 | ); | |
988 | } | |
989 | ||
990 | /* | |
991 | * Compact header: | |
992 | * id: range: 0 - 30. | |
993 | * id 31 is reserved to indicate an extended header. | |
994 | * | |
995 | * Large header: | |
996 | * id: range: 0 - 65534. | |
997 | * id 65535 is reserved to indicate an extended header. | |
998 | */ | |
999 | static | |
7dd08bec | 1000 | int _lttng_event_header_declare(struct lttng_session *session) |
8020ceb5 MD |
1001 | { |
1002 | return lttng_metadata_printf(session, | |
1003 | "struct event_header_compact {\n" | |
1004 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1005 | " variant <id> {\n" | |
1006 | " struct {\n" | |
28b12049 | 1007 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1008 | " } compact;\n" |
1009 | " struct {\n" | |
1010 | " uint32_t id;\n" | |
28b12049 | 1011 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1012 | " } extended;\n" |
1013 | " } v;\n" | |
1014 | "} align(%u);\n" | |
1015 | "\n" | |
1016 | "struct event_header_large {\n" | |
1017 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1018 | " variant <id> {\n" | |
1019 | " struct {\n" | |
28b12049 | 1020 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1021 | " } compact;\n" |
1022 | " struct {\n" | |
1023 | " uint32_t id;\n" | |
28b12049 | 1024 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1025 | " } extended;\n" |
1026 | " } v;\n" | |
1027 | "} align(%u);\n\n", | |
1dbfff0c MD |
1028 | lttng_alignof(uint32_t) * CHAR_BIT, |
1029 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1030 | ); |
1031 | } | |
1032 | ||
28b12049 MD |
1033 | /* |
1034 | * Approximation of NTP time of day to clock monotonic correlation, | |
1035 | * taken at start of trace. | |
1036 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1037 | * in future versions. | |
1038 | */ | |
1039 | static | |
1040 | uint64_t measure_clock_offset(void) | |
1041 | { | |
1042 | uint64_t offset, monotonic[2], realtime; | |
1043 | struct timespec rts = { 0, 0 }; | |
1044 | int ret; | |
1045 | ||
1046 | monotonic[0] = trace_clock_read64(); | |
1047 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1048 | if (ret < 0) | |
1049 | return 0; | |
1050 | monotonic[1] = trace_clock_read64(); | |
1051 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1052 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1053 | realtime += rts.tv_nsec; |
1054 | offset = realtime - offset; | |
1055 | return offset; | |
1056 | } | |
1057 | ||
8020ceb5 MD |
1058 | /* |
1059 | * Output metadata into this session's metadata buffers. | |
1060 | */ | |
1061 | static | |
7dd08bec | 1062 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
8020ceb5 | 1063 | { |
74d81a6c | 1064 | unsigned char *uuid_c; |
19d8b1b3 MD |
1065 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1066 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
7dd08bec MD |
1067 | struct lttng_channel *chan; |
1068 | struct lttng_event *event; | |
8020ceb5 | 1069 | int ret = 0; |
08114193 | 1070 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1071 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1072 | |
b5234c06 | 1073 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1074 | return 0; |
1075 | if (session->metadata_dumped) | |
1076 | goto skip_session; | |
1077 | if (!session->metadata) { | |
b5234c06 | 1078 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1079 | return -EPERM; |
1080 | } | |
74d81a6c | 1081 | uuid_c = session->metadata->uuid; |
8020ceb5 MD |
1082 | |
1083 | snprintf(uuid_s, sizeof(uuid_s), | |
1084 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1085 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1086 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1087 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1088 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1089 | ||
1090 | ret = lttng_metadata_printf(session, | |
1091 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1092 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1093 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1094 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1095 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1096 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1097 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1098 | "\n" | |
1099 | "trace {\n" | |
1100 | " major = %u;\n" | |
1101 | " minor = %u;\n" | |
1102 | " uuid = \"%s\";\n" | |
1103 | " byte_order = %s;\n" | |
1104 | " packet.header := struct {\n" | |
1105 | " uint32_t magic;\n" | |
1106 | " uint8_t uuid[16];\n" | |
1107 | " uint32_t stream_id;\n" | |
1108 | " };\n" | |
1109 | "};\n\n", | |
1dbfff0c MD |
1110 | lttng_alignof(uint8_t) * CHAR_BIT, |
1111 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1112 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1113 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1114 | sizeof(unsigned long) * CHAR_BIT, |
1115 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1116 | CTF_SPEC_MAJOR, |
1117 | CTF_SPEC_MINOR, | |
8020ceb5 | 1118 | uuid_s, |
8a98a75d | 1119 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1120 | "be" |
1121 | #else | |
1122 | "le" | |
1123 | #endif | |
1124 | ); | |
1125 | if (ret) | |
1126 | goto end; | |
1127 | ||
b020e504 | 1128 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1129 | hostname[0] = '\0'; |
1130 | ret = gethostname(hostname, sizeof(hostname)); | |
1131 | if (ret && errno == ENAMETOOLONG) | |
1132 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1133 | lttng_ust_getprocname(procname); |
1134 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1135 | ret = lttng_metadata_printf(session, |
1136 | "env {\n" | |
9e4d42a0 | 1137 | " hostname = \"%s\";\n" |
b020e504 MD |
1138 | " vpid = %d;\n" |
1139 | " procname = \"%s\";\n" | |
2694975d MD |
1140 | " domain = \"ust\";\n" |
1141 | " tracer_name = \"lttng-ust\";\n" | |
1142 | " tracer_major = %u;\n" | |
1143 | " tracer_minor = %u;\n" | |
1144 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1145 | "};\n\n", |
9e4d42a0 | 1146 | hostname, |
b020e504 MD |
1147 | (int) getpid(), |
1148 | procname, | |
2694975d MD |
1149 | LTTNG_UST_MAJOR_VERSION, |
1150 | LTTNG_UST_MINOR_VERSION, | |
1151 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1152 | ); |
1153 | if (ret) | |
1154 | goto end; | |
1155 | ||
28b12049 MD |
1156 | ret = lttng_metadata_printf(session, |
1157 | "clock {\n" | |
939950af MD |
1158 | " name = %s;\n", |
1159 | "monotonic" | |
1160 | ); | |
1161 | if (ret) | |
1162 | goto end; | |
1163 | ||
1164 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1165 | ret = lttng_metadata_printf(session, | |
1166 | " uuid = \"%s\";\n", | |
1167 | clock_uuid_s | |
1168 | ); | |
1169 | if (ret) | |
1170 | goto end; | |
1171 | } | |
1172 | ||
1173 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1174 | " description = \"Monotonic Clock\";\n" |
1175 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1176 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1177 | " offset = %" PRIu64 ";\n" | |
1178 | "};\n\n", | |
28b12049 MD |
1179 | trace_clock_freq(), |
1180 | measure_clock_offset() | |
1181 | ); | |
1182 | if (ret) | |
1183 | goto end; | |
1184 | ||
1185 | ret = lttng_metadata_printf(session, | |
1186 | "typealias integer {\n" | |
1187 | " size = 27; align = 1; signed = false;\n" | |
1188 | " map = clock.monotonic.value;\n" | |
1189 | "} := uint27_clock_monotonic_t;\n" | |
1190 | "\n" | |
1191 | "typealias integer {\n" | |
1192 | " size = 32; align = %u; signed = false;\n" | |
1193 | " map = clock.monotonic.value;\n" | |
1194 | "} := uint32_clock_monotonic_t;\n" | |
1195 | "\n" | |
1196 | "typealias integer {\n" | |
1197 | " size = 64; align = %u; signed = false;\n" | |
1198 | " map = clock.monotonic.value;\n" | |
1199 | "} := uint64_clock_monotonic_t;\n\n", | |
1200 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1201 | lttng_alignof(uint64_t) * CHAR_BIT | |
1202 | ); | |
1203 | if (ret) | |
1204 | goto end; | |
1205 | ||
7dd08bec | 1206 | ret = _lttng_stream_packet_context_declare(session); |
8020ceb5 MD |
1207 | if (ret) |
1208 | goto end; | |
1209 | ||
7dd08bec | 1210 | ret = _lttng_event_header_declare(session); |
8020ceb5 MD |
1211 | if (ret) |
1212 | goto end; | |
1213 | ||
1214 | skip_session: | |
e58095ef | 1215 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
7dd08bec | 1216 | ret = _lttng_channel_metadata_statedump(session, chan); |
8020ceb5 MD |
1217 | if (ret) |
1218 | goto end; | |
1219 | } | |
1220 | ||
e58095ef | 1221 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 1222 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
8020ceb5 MD |
1223 | if (ret) |
1224 | goto end; | |
1225 | } | |
1226 | session->metadata_dumped = 1; | |
1227 | end: | |
1228 | return ret; | |
1229 | } | |
1230 | ||
003fedf4 | 1231 | void lttng_ust_events_exit(void) |
8020ceb5 | 1232 | { |
7dd08bec | 1233 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1234 | |
e58095ef | 1235 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1236 | lttng_session_destroy(session); |
8020ceb5 | 1237 | } |
457a6b58 | 1238 | |
e58095ef MD |
1239 | /* |
1240 | * Enabler management. | |
1241 | */ | |
1242 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1243 | struct lttng_ust_event *event_param, | |
1244 | struct lttng_channel *chan) | |
457a6b58 | 1245 | { |
e58095ef MD |
1246 | struct lttng_enabler *enabler; |
1247 | ||
1248 | enabler = zmalloc(sizeof(*enabler)); | |
1249 | if (!enabler) | |
1250 | return NULL; | |
1251 | enabler->type = type; | |
1252 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
1253 | memcpy(&enabler->event_param, event_param, | |
1254 | sizeof(enabler->event_param)); | |
1255 | enabler->chan = chan; | |
1256 | /* ctx left NULL */ | |
1257 | enabler->enabled = 1; | |
1258 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1259 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1260 | return enabler; | |
457a6b58 MD |
1261 | } |
1262 | ||
e58095ef | 1263 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1264 | { |
e58095ef MD |
1265 | enabler->enabled = 1; |
1266 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1267 | return 0; | |
457a6b58 | 1268 | } |
457a6b58 | 1269 | |
e58095ef | 1270 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1271 | { |
e58095ef MD |
1272 | if (enabler->chan == enabler->chan->session->metadata) |
1273 | return -EPERM; | |
1274 | enabler->enabled = 0; | |
1275 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1276 | return 0; | |
1277 | } | |
457a6b58 | 1278 | |
e58095ef MD |
1279 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1280 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1281 | { | |
1282 | bytecode->enabler = enabler; | |
1283 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1284 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1285 | return 0; | |
1286 | } | |
f488575f | 1287 | |
e58095ef MD |
1288 | int lttng_attach_context(struct lttng_ust_context *context_param, |
1289 | struct lttng_ctx **ctx, struct lttng_session *session) | |
1290 | { | |
457a6b58 | 1291 | /* |
e58095ef MD |
1292 | * We cannot attach a context after trace has been started for a |
1293 | * session because the metadata does not allow expressing this | |
1294 | * information outside of the original channel scope. | |
457a6b58 | 1295 | */ |
e58095ef MD |
1296 | if (session->been_active) |
1297 | return -EPERM; | |
457a6b58 | 1298 | |
e58095ef MD |
1299 | switch (context_param->ctx) { |
1300 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1301 | return lttng_add_pthread_id_to_ctx(ctx); | |
1302 | case LTTNG_UST_CONTEXT_VTID: | |
1303 | return lttng_add_vtid_to_ctx(ctx); | |
1304 | case LTTNG_UST_CONTEXT_VPID: | |
1305 | return lttng_add_vpid_to_ctx(ctx); | |
1306 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1307 | return lttng_add_procname_to_ctx(ctx); | |
1308 | default: | |
1309 | return -EINVAL; | |
457a6b58 | 1310 | } |
457a6b58 MD |
1311 | } |
1312 | ||
e58095ef MD |
1313 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1314 | struct lttng_ust_context *context_param) | |
457a6b58 | 1315 | { |
e58095ef MD |
1316 | #if 0 // disabled for now. |
1317 | struct lttng_session *session = enabler->chan->session; | |
1318 | int ret; | |
457a6b58 | 1319 | |
e58095ef MD |
1320 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1321 | session); | |
1322 | if (ret) | |
1323 | return ret; | |
1324 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1325 | #endif | |
1326 | return -ENOSYS; | |
457a6b58 MD |
1327 | } |
1328 | ||
e58095ef MD |
1329 | static |
1330 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1331 | { |
e58095ef | 1332 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
457a6b58 | 1333 | |
e58095ef MD |
1334 | /* Destroy filter bytecode */ |
1335 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1336 | &enabler->filter_bytecode_head, node) { | |
1337 | free(filter_node); | |
457a6b58 | 1338 | } |
e58095ef MD |
1339 | |
1340 | /* Destroy contexts */ | |
1341 | lttng_destroy_context(enabler->ctx); | |
1342 | ||
1343 | cds_list_del(&enabler->node); | |
1344 | free(enabler); | |
457a6b58 MD |
1345 | } |
1346 | ||
e58095ef MD |
1347 | /* |
1348 | * lttng_session_sync_enablers should be called just before starting a | |
1349 | * session. | |
1350 | */ | |
457a6b58 | 1351 | static |
e58095ef | 1352 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1353 | { |
e58095ef MD |
1354 | struct lttng_enabler *enabler; |
1355 | struct lttng_event *event; | |
457a6b58 | 1356 | |
e58095ef MD |
1357 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1358 | lttng_enabler_ref_events(enabler); | |
1359 | /* | |
1360 | * For each event, if at least one of its enablers is enabled, | |
1361 | * we enable the event, else we disable it. | |
1362 | */ | |
1363 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1364 | struct lttng_enabler_ref *enabler_ref; | |
1365 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1366 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1367 | |
1368 | /* Enable events */ | |
1369 | cds_list_for_each_entry(enabler_ref, | |
1370 | &event->enablers_ref_head, node) { | |
1371 | if (enabler_ref->ref->enabled) { | |
1372 | enabled = 1; | |
1373 | break; | |
1374 | } | |
1375 | } | |
1376 | event->enabled = enabled; | |
457a6b58 | 1377 | |
1f49fc05 | 1378 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1379 | cds_list_for_each_entry(enabler_ref, |
1380 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1381 | if (enabler_ref->ref->enabled |
1382 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1383 | has_enablers_without_bytecode = 1; |
1384 | break; | |
1385 | } | |
1386 | } | |
1387 | event->has_enablers_without_bytecode = | |
1388 | has_enablers_without_bytecode; | |
1389 | ||
e58095ef MD |
1390 | /* Enable filters */ |
1391 | cds_list_for_each_entry(runtime, | |
1392 | &event->bytecode_runtime_head, node) { | |
1393 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1394 | } |
1395 | } | |
457a6b58 MD |
1396 | } |
1397 | ||
e58095ef MD |
1398 | /* |
1399 | * Apply enablers to session events, adding events to session if need | |
1400 | * be. It is required after each modification applied to an active | |
1401 | * session, and right before session "start". | |
1402 | * "lazy" sync means we only sync if required. | |
1403 | */ | |
1404 | static | |
1405 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1406 | { |
e58095ef MD |
1407 | /* We can skip if session is not active */ |
1408 | if (!session->active) | |
1409 | return; | |
1410 | lttng_session_sync_enablers(session); | |
457a6b58 | 1411 | } |