Commit | Line | Data |
---|---|---|
8020ceb5 MD |
1 | /* |
2 | * ltt-events.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * Holds LTTng per-session event registry. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
b5234c06 MD |
11 | #define _GNU_SOURCE |
12 | #include <stdio.h> | |
8a98a75d | 13 | #include <endian.h> |
b5234c06 | 14 | #include <urcu/list.h> |
8165c8da | 15 | #include <urcu/hlist.h> |
b5234c06 | 16 | #include <pthread.h> |
b5234c06 | 17 | #include <uuid/uuid.h> |
b5234c06 | 18 | #include <errno.h> |
f4681817 MD |
19 | #include <sys/shm.h> |
20 | #include <sys/ipc.h> | |
44c72f10 MD |
21 | #include <stdint.h> |
22 | #include <stddef.h> | |
28b12049 MD |
23 | #include <inttypes.h> |
24 | #include <time.h> | |
25 | #include "clock.h" | |
44c72f10 MD |
26 | |
27 | #include <urcu-bp.h> | |
28 | #include <urcu/compiler.h> | |
29 | #include <urcu/uatomic.h> | |
30 | #include <urcu/arch.h> | |
31 | ||
32 | #include <lttng/tracepoint.h> | |
4318ae1b | 33 | #include <lttng/ust-events.h> |
44c72f10 MD |
34 | |
35 | #include <usterr-signal-safe.h> | |
36 | #include <helper.h> | |
1f18504e | 37 | #include "error.h" |
44c72f10 | 38 | |
8020ceb5 | 39 | #include "ltt-tracer.h" |
8165c8da | 40 | #include "ltt-tracer-core.h" |
b728d87e | 41 | #include "wait.h" |
8d8a24c8 | 42 | #include "../libringbuffer/shm.h" |
596c4223 | 43 | #include "jhash.h" |
8165c8da MD |
44 | |
45 | /* | |
46 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
47 | * control and probe registration. All operations within this file are |
48 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 49 | */ |
2b2d6ff7 | 50 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 51 | |
17dfb34b | 52 | void ust_lock(void) |
8165c8da MD |
53 | { |
54 | pthread_mutex_lock(&sessions_mutex); | |
55 | } | |
56 | ||
17dfb34b | 57 | void ust_unlock(void) |
8165c8da MD |
58 | { |
59 | pthread_mutex_unlock(&sessions_mutex); | |
60 | } | |
61 | ||
b5234c06 | 62 | static CDS_LIST_HEAD(sessions); |
8165c8da MD |
63 | |
64 | /* | |
65 | * Pending probes hash table, containing the registered ltt events for | |
66 | * which tracepoint probes are still missing. Protected by the sessions | |
67 | * mutex. | |
68 | */ | |
69 | #define PENDING_PROBE_HASH_BITS 6 | |
70 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
71 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
72 | ||
73 | struct ust_pending_probe { | |
74 | struct ltt_event *event; | |
75 | struct cds_hlist_node node; | |
76 | char name[]; | |
77 | }; | |
8020ceb5 MD |
78 | |
79 | static void _ltt_event_destroy(struct ltt_event *event); | |
574a6217 | 80 | static void _ltt_loglevel_destroy(struct session_loglevel *sl); |
e6c12e3d | 81 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
82 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
83 | static int _ltt_event_unregister(struct ltt_event *event); | |
84 | static | |
85 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
86 | struct ltt_channel *chan, | |
87 | struct ltt_event *event); | |
88 | static | |
89 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
90 | ||
8165c8da MD |
91 | /* |
92 | * called at event creation if probe is missing. | |
93 | * called with session mutex held. | |
94 | */ | |
95 | static | |
96 | int add_pending_probe(struct ltt_event *event, const char *name) | |
97 | { | |
98 | struct cds_hlist_head *head; | |
8165c8da | 99 | struct ust_pending_probe *e; |
ff412fb5 MD |
100 | size_t name_len = strlen(name); |
101 | uint32_t hash; | |
8165c8da | 102 | |
ff412fb5 MD |
103 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
104 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
105 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
106 | } | |
107 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
108 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
109 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
110 | if (!e) | |
111 | return -ENOMEM; | |
ff412fb5 MD |
112 | memcpy(&e->name[0], name, name_len + 1); |
113 | e->name[name_len] = '\0'; | |
8165c8da MD |
114 | cds_hlist_add_head(&e->node, head); |
115 | e->event = event; | |
116 | event->pending_probe = e; | |
117 | return 0; | |
118 | } | |
119 | ||
120 | /* | |
121 | * remove a pending probe. called when at event teardown and when an | |
122 | * event is fixed (probe is loaded). | |
123 | * called with session mutex held. | |
124 | */ | |
125 | static | |
126 | void remove_pending_probe(struct ust_pending_probe *e) | |
127 | { | |
128 | if (!e) | |
129 | return; | |
130 | cds_hlist_del(&e->node); | |
131 | free(e); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Called at library load: connect the probe on the events pending on | |
136 | * probe load. | |
137 | * called with session mutex held. | |
138 | */ | |
139 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
140 | { | |
141 | struct cds_hlist_head *head; | |
142 | struct cds_hlist_node *node, *p; | |
143 | struct ust_pending_probe *e; | |
144 | const char *name = desc->name; | |
8165c8da | 145 | int ret = 0; |
7ee3cc56 | 146 | struct lttng_ust_event event_param; |
ff412fb5 MD |
147 | size_t name_len = strlen(name); |
148 | uint32_t hash; | |
8165c8da | 149 | |
574a6217 | 150 | /* |
1f18504e MD |
151 | * For this event, we need to lookup the loglevel. If active (in |
152 | * the active loglevels hash table), we must create the event. | |
153 | */ | |
574a6217 MD |
154 | if (desc->loglevel) { |
155 | const struct tracepoint_loglevel_entry *ev_ll; | |
156 | struct loglevel_entry *loglevel; | |
157 | ||
158 | ev_ll = *desc->loglevel; | |
159 | loglevel = get_loglevel(ev_ll->identifier); | |
48740cab MD |
160 | if (!loglevel) |
161 | loglevel = get_loglevel_value(ev_ll->value); | |
574a6217 MD |
162 | if (loglevel) { |
163 | struct session_loglevel *sl; | |
164 | ||
165 | cds_list_for_each_entry(sl, &loglevel->session_list, | |
166 | session_list) { | |
167 | struct ltt_event *ev; | |
168 | int ret; | |
169 | ||
7ee3cc56 MD |
170 | memcpy(&event_param, &sl->event_param, |
171 | sizeof(event_param)); | |
172 | memcpy(event_param.name, | |
173 | desc->name, | |
174 | sizeof(event_param.name)); | |
574a6217 MD |
175 | /* create event */ |
176 | ret = ltt_event_create(sl->chan, | |
7ee3cc56 | 177 | &event_param, NULL, |
574a6217 | 178 | &ev); |
7ee3cc56 MD |
179 | if (ret) { |
180 | DBG("Error creating event"); | |
574a6217 | 181 | continue; |
7ee3cc56 | 182 | } |
574a6217 MD |
183 | cds_list_add(&ev->loglevel_list, |
184 | &sl->events); | |
185 | } | |
186 | } | |
187 | } | |
1f18504e | 188 | |
e6c12e3d MD |
189 | /* Wildcard */ |
190 | { | |
191 | struct wildcard_entry *wildcard; | |
192 | ||
193 | wildcard = match_wildcard(desc->name); | |
194 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { | |
195 | struct session_wildcard *sw; | |
196 | ||
197 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
198 | session_list) { | |
199 | struct ltt_event *ev; | |
200 | int ret; | |
201 | ||
202 | memcpy(&event_param, &sw->event_param, | |
203 | sizeof(event_param)); | |
204 | memcpy(event_param.name, | |
205 | desc->name, | |
206 | sizeof(event_param.name)); | |
207 | /* create event */ | |
208 | ret = ltt_event_create(sw->chan, | |
209 | &event_param, NULL, | |
210 | &ev); | |
211 | if (ret) { | |
212 | DBG("Error creating event"); | |
213 | continue; | |
214 | } | |
215 | cds_list_add(&ev->wildcard_list, | |
216 | &sw->events); | |
217 | } | |
218 | } | |
219 | } | |
220 | ||
ff412fb5 MD |
221 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
222 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
223 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
224 | } | |
225 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
226 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
227 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
228 | struct ltt_event *event; | |
229 | struct ltt_channel *chan; | |
230 | ||
ff412fb5 | 231 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) |
8165c8da MD |
232 | continue; |
233 | event = e->event; | |
234 | chan = event->chan; | |
235 | assert(!event->desc); | |
236 | event->desc = desc; | |
237 | event->pending_probe = NULL; | |
238 | remove_pending_probe(e); | |
239 | ret |= __tracepoint_probe_register(name, | |
240 | event->desc->probe_callback, | |
241 | event); | |
636c5aa4 MD |
242 | if (ret) |
243 | continue; | |
244 | event->id = chan->free_event_id++; | |
8165c8da MD |
245 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
246 | event); | |
247 | } | |
248 | return ret; | |
249 | } | |
250 | ||
8020ceb5 MD |
251 | void synchronize_trace(void) |
252 | { | |
8020ceb5 | 253 | synchronize_rcu(); |
8020ceb5 MD |
254 | } |
255 | ||
256 | struct ltt_session *ltt_session_create(void) | |
257 | { | |
258 | struct ltt_session *session; | |
259 | ||
b5234c06 | 260 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
261 | if (!session) |
262 | return NULL; | |
b5234c06 MD |
263 | CDS_INIT_LIST_HEAD(&session->chan); |
264 | CDS_INIT_LIST_HEAD(&session->events); | |
1f18504e | 265 | CDS_INIT_LIST_HEAD(&session->loglevels); |
e6c12e3d | 266 | CDS_INIT_LIST_HEAD(&session->wildcards); |
b5234c06 MD |
267 | uuid_generate(session->uuid); |
268 | cds_list_add(&session->list, &sessions); | |
8020ceb5 MD |
269 | return session; |
270 | } | |
271 | ||
272 | void ltt_session_destroy(struct ltt_session *session) | |
273 | { | |
274 | struct ltt_channel *chan, *tmpchan; | |
275 | struct ltt_event *event, *tmpevent; | |
574a6217 | 276 | struct session_loglevel *loglevel, *tmploglevel; |
e6c12e3d | 277 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
278 | int ret; |
279 | ||
b5234c06 MD |
280 | CMM_ACCESS_ONCE(session->active) = 0; |
281 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
282 | ret = _ltt_event_unregister(event); |
283 | WARN_ON(ret); | |
284 | } | |
285 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
1f18504e MD |
286 | cds_list_for_each_entry_safe(loglevel, tmploglevel, &session->loglevels, list) |
287 | _ltt_loglevel_destroy(loglevel); | |
e6c12e3d MD |
288 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
289 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 290 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 291 | _ltt_event_destroy(event); |
b5234c06 | 292 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 293 | _ltt_channel_destroy(chan); |
b5234c06 | 294 | cds_list_del(&session->list); |
b5234c06 | 295 | free(session); |
8020ceb5 MD |
296 | } |
297 | ||
976fe9ea | 298 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
299 | { |
300 | int ret = 0; | |
301 | struct ltt_channel *chan; | |
302 | ||
8020ceb5 MD |
303 | if (session->active) { |
304 | ret = -EBUSY; | |
305 | goto end; | |
306 | } | |
307 | ||
308 | /* | |
309 | * Snapshot the number of events per channel to know the type of header | |
310 | * we need to use. | |
311 | */ | |
b5234c06 | 312 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
313 | if (chan->header_type) |
314 | continue; /* don't change it if session stop/restart */ | |
315 | if (chan->free_event_id < 31) | |
316 | chan->header_type = 1; /* compact */ | |
317 | else | |
318 | chan->header_type = 2; /* large */ | |
319 | } | |
320 | ||
b5234c06 MD |
321 | CMM_ACCESS_ONCE(session->active) = 1; |
322 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 323 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 324 | if (ret) |
b5234c06 | 325 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 326 | end: |
8020ceb5 MD |
327 | return ret; |
328 | } | |
329 | ||
976fe9ea | 330 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
331 | { |
332 | int ret = 0; | |
333 | ||
8020ceb5 MD |
334 | if (!session->active) { |
335 | ret = -EBUSY; | |
336 | goto end; | |
337 | } | |
b5234c06 | 338 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 339 | end: |
8020ceb5 MD |
340 | return ret; |
341 | } | |
342 | ||
976fe9ea MD |
343 | int ltt_channel_enable(struct ltt_channel *channel) |
344 | { | |
345 | int old; | |
346 | ||
9beb36ba MD |
347 | if (channel == channel->session->metadata) |
348 | return -EPERM; | |
b5234c06 | 349 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
350 | if (old) |
351 | return -EEXIST; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | int ltt_channel_disable(struct ltt_channel *channel) | |
356 | { | |
357 | int old; | |
358 | ||
9beb36ba MD |
359 | if (channel == channel->session->metadata) |
360 | return -EPERM; | |
b5234c06 | 361 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
362 | if (!old) |
363 | return -EEXIST; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | int ltt_event_enable(struct ltt_event *event) | |
368 | { | |
369 | int old; | |
370 | ||
9beb36ba MD |
371 | if (event->chan == event->chan->session->metadata) |
372 | return -EPERM; | |
b5234c06 | 373 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
374 | if (old) |
375 | return -EEXIST; | |
376 | return 0; | |
377 | } | |
378 | ||
379 | int ltt_event_disable(struct ltt_event *event) | |
380 | { | |
381 | int old; | |
382 | ||
9beb36ba MD |
383 | if (event->chan == event->chan->session->metadata) |
384 | return -EPERM; | |
b5234c06 | 385 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
386 | if (!old) |
387 | return -EEXIST; | |
388 | return 0; | |
389 | } | |
390 | ||
8020ceb5 MD |
391 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
392 | const char *transport_name, | |
393 | void *buf_addr, | |
394 | size_t subbuf_size, size_t num_subbuf, | |
395 | unsigned int switch_timer_interval, | |
193183fb | 396 | unsigned int read_timer_interval, |
ef9ff354 MD |
397 | int **shm_fd, int **wait_fd, |
398 | uint64_t **memory_map_size, | |
d028eddb | 399 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 400 | { |
a3f61e7f | 401 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
402 | struct ltt_transport *transport; |
403 | ||
8020ceb5 MD |
404 | if (session->been_active) |
405 | goto active; /* Refuse to add channel to active session */ | |
406 | transport = ltt_transport_find(transport_name); | |
407 | if (!transport) { | |
b5234c06 | 408 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
409 | transport_name); |
410 | goto notransport; | |
411 | } | |
d028eddb MD |
412 | chan_priv_init->id = session->free_chan_id++; |
413 | chan_priv_init->session = session; | |
8020ceb5 MD |
414 | /* |
415 | * Note: the channel creation op already writes into the packet | |
416 | * headers. Therefore the "chan" information used as input | |
417 | * should be already accessible. | |
418 | */ | |
a3f61e7f | 419 | chan = transport->ops.channel_create("[lttng]", buf_addr, |
8020ceb5 | 420 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 421 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 422 | memory_map_size, chan_priv_init); |
a3f61e7f | 423 | if (!chan) |
8020ceb5 | 424 | goto create_error; |
976fe9ea | 425 | chan->enabled = 1; |
8020ceb5 | 426 | chan->ops = &transport->ops; |
b5234c06 | 427 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
428 | return chan; |
429 | ||
430 | create_error: | |
8020ceb5 MD |
431 | notransport: |
432 | active: | |
8020ceb5 MD |
433 | return NULL; |
434 | } | |
435 | ||
436 | /* | |
437 | * Only used internally at session destruction. | |
438 | */ | |
439 | static | |
440 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
441 | { | |
b5234c06 | 442 | cds_list_del(&chan->list); |
8020ceb5 | 443 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 444 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
445 | } |
446 | ||
1f18504e MD |
447 | int ltt_loglevel_create(struct ltt_channel *chan, |
448 | struct lttng_ust_event *event_param, | |
574a6217 | 449 | struct session_loglevel **_sl) |
1f18504e | 450 | { |
574a6217 | 451 | struct session_loglevel *sl; |
1f18504e | 452 | |
574a6217 MD |
453 | sl = add_loglevel(event_param->name, chan, event_param); |
454 | if (!sl || IS_ERR(sl)) { | |
455 | return PTR_ERR(sl); | |
1f18504e | 456 | } |
574a6217 | 457 | *_sl = sl; |
1f18504e MD |
458 | return 0; |
459 | } | |
460 | ||
461 | static | |
574a6217 | 462 | void _ltt_loglevel_destroy(struct session_loglevel *sl) |
1f18504e | 463 | { |
574a6217 | 464 | _remove_loglevel(sl); |
1f18504e MD |
465 | } |
466 | ||
e6c12e3d MD |
467 | int ltt_wildcard_create(struct ltt_channel *chan, |
468 | struct lttng_ust_event *event_param, | |
469 | struct session_wildcard **_sw) | |
470 | { | |
471 | struct session_wildcard *sw; | |
472 | ||
473 | sw = add_wildcard(event_param->name, chan, event_param); | |
474 | if (!sw || IS_ERR(sw)) { | |
475 | return PTR_ERR(sw); | |
476 | } | |
477 | *_sw = sw; | |
478 | return 0; | |
479 | } | |
480 | ||
481 | static | |
482 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
483 | { | |
484 | _remove_wildcard(sw); | |
485 | } | |
486 | ||
8020ceb5 MD |
487 | /* |
488 | * Supports event creation while tracing session is active. | |
489 | */ | |
576599a0 MD |
490 | int ltt_event_create(struct ltt_channel *chan, |
491 | struct lttng_ust_event *event_param, | |
492 | void *filter, | |
493 | struct ltt_event **_event) | |
8020ceb5 MD |
494 | { |
495 | struct ltt_event *event; | |
576599a0 | 496 | int ret = 0; |
8020ceb5 | 497 | |
576599a0 MD |
498 | if (chan->used_event_id == -1UL) { |
499 | ret = -ENOMEM; | |
8020ceb5 | 500 | goto full; |
576599a0 | 501 | } |
8020ceb5 MD |
502 | /* |
503 | * This is O(n^2) (for each event, the loop is called at event | |
504 | * creation). Might require a hash if we have lots of events. | |
505 | */ | |
576599a0 | 506 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
507 | if (event->desc && !strncmp(event->desc->name, |
508 | event_param->name, | |
509 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 510 | ret = -EEXIST; |
8020ceb5 | 511 | goto exist; |
576599a0 MD |
512 | } |
513 | } | |
b5234c06 | 514 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
515 | if (!event) { |
516 | ret = -ENOMEM; | |
8020ceb5 | 517 | goto cache_error; |
576599a0 | 518 | } |
8020ceb5 MD |
519 | event->chan = chan; |
520 | event->filter = filter; | |
8165c8da MD |
521 | /* |
522 | * used_event_id counts the maximum number of event IDs that can | |
523 | * register if all probes register. | |
524 | */ | |
525 | chan->used_event_id++; | |
976fe9ea | 526 | event->enabled = 1; |
8020ceb5 MD |
527 | event->instrumentation = event_param->instrumentation; |
528 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 529 | cmm_smp_wmb(); |
8020ceb5 | 530 | switch (event_param->instrumentation) { |
b5234c06 | 531 | case LTTNG_UST_TRACEPOINT: |
8020ceb5 | 532 | event->desc = ltt_event_get(event_param->name); |
8165c8da MD |
533 | if (event->desc) { |
534 | ret = __tracepoint_probe_register(event_param->name, | |
535 | event->desc->probe_callback, | |
536 | event); | |
537 | if (ret) | |
538 | goto register_error; | |
539 | event->id = chan->free_event_id++; | |
540 | } else { | |
541 | /* | |
542 | * If the probe is not present, event->desc stays NULL, | |
543 | * waiting for the probe to register, and the event->id | |
544 | * stays unallocated. | |
545 | */ | |
546 | ret = add_pending_probe(event, event_param->name); | |
547 | if (ret) | |
548 | goto add_pending_error; | |
549 | } | |
8020ceb5 | 550 | break; |
8020ceb5 MD |
551 | default: |
552 | WARN_ON_ONCE(1); | |
553 | } | |
8165c8da MD |
554 | if (event->desc) { |
555 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
556 | if (ret) | |
557 | goto statedump_error; | |
558 | } | |
b5234c06 | 559 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
560 | *_event = event; |
561 | return 0; | |
8020ceb5 MD |
562 | |
563 | statedump_error: | |
8165c8da MD |
564 | if (event->desc) { |
565 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
566 | event->desc->probe_callback, | |
567 | event)); | |
568 | ltt_event_put(event->desc); | |
569 | } | |
570 | add_pending_error: | |
8020ceb5 | 571 | register_error: |
b5234c06 | 572 | free(event); |
8020ceb5 MD |
573 | cache_error: |
574 | exist: | |
575 | full: | |
576599a0 | 576 | return ret; |
8020ceb5 MD |
577 | } |
578 | ||
579 | /* | |
580 | * Only used internally at session destruction. | |
581 | */ | |
582 | int _ltt_event_unregister(struct ltt_event *event) | |
583 | { | |
584 | int ret = -EINVAL; | |
585 | ||
586 | switch (event->instrumentation) { | |
b5234c06 | 587 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
588 | if (event->desc) { |
589 | ret = __tracepoint_probe_unregister(event->desc->name, | |
590 | event->desc->probe_callback, | |
591 | event); | |
592 | if (ret) | |
593 | return ret; | |
594 | } else { | |
595 | remove_pending_probe(event->pending_probe); | |
596 | ret = 0; | |
597 | } | |
8020ceb5 | 598 | break; |
8020ceb5 MD |
599 | default: |
600 | WARN_ON_ONCE(1); | |
601 | } | |
602 | return ret; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Only used internally at session destruction. | |
607 | */ | |
608 | static | |
609 | void _ltt_event_destroy(struct ltt_event *event) | |
610 | { | |
611 | switch (event->instrumentation) { | |
b5234c06 | 612 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
613 | if (event->desc) { |
614 | ltt_event_put(event->desc); | |
615 | } | |
8020ceb5 | 616 | break; |
8020ceb5 MD |
617 | default: |
618 | WARN_ON_ONCE(1); | |
619 | } | |
b5234c06 | 620 | cds_list_del(&event->list); |
8020ceb5 | 621 | lttng_destroy_context(event->ctx); |
b5234c06 | 622 | free(event); |
8020ceb5 MD |
623 | } |
624 | ||
625 | /* | |
626 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 627 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
628 | * remaining space left in packet and write, since mutual exclusion |
629 | * protects us from concurrent writes. | |
630 | */ | |
631 | int lttng_metadata_printf(struct ltt_session *session, | |
632 | const char *fmt, ...) | |
633 | { | |
4cfec15c | 634 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 635 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 636 | char *str = NULL; |
8020ceb5 MD |
637 | int ret = 0, waitret; |
638 | size_t len, reserve_len, pos; | |
639 | va_list ap; | |
640 | ||
b5234c06 | 641 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
642 | |
643 | va_start(ap, fmt); | |
b5234c06 | 644 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 645 | va_end(ap); |
b5234c06 | 646 | if (ret < 0) |
8020ceb5 MD |
647 | return -ENOMEM; |
648 | ||
649 | len = strlen(str); | |
650 | pos = 0; | |
651 | ||
652 | for (pos = 0; pos < len; pos += reserve_len) { | |
653 | reserve_len = min_t(size_t, | |
1d498196 | 654 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
655 | len - pos); |
656 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 657 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
658 | /* |
659 | * We don't care about metadata buffer's records lost | |
660 | * count, because we always retry here. Report error if | |
661 | * we need to bail out after timeout or being | |
662 | * interrupted. | |
663 | */ | |
b5234c06 | 664 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
665 | ({ |
666 | ret = chan->ops->event_reserve(&ctx, 0); | |
667 | ret != -ENOBUFS || !ret; | |
668 | }), | |
b5234c06 | 669 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 670 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
671 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
672 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 673 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 674 | if (waitret == -EINTR) |
8020ceb5 MD |
675 | ret = waitret; |
676 | goto end; | |
677 | } | |
678 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
679 | chan->ops->event_commit(&ctx); | |
680 | } | |
681 | end: | |
b5234c06 | 682 | free(str); |
8020ceb5 MD |
683 | return ret; |
684 | } | |
685 | ||
686 | static | |
687 | int _ltt_field_statedump(struct ltt_session *session, | |
688 | const struct lttng_event_field *field) | |
689 | { | |
690 | int ret = 0; | |
691 | ||
692 | switch (field->type.atype) { | |
693 | case atype_integer: | |
694 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 695 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
696 | field->type.u.basic.integer.size, |
697 | field->type.u.basic.integer.alignment, | |
698 | field->type.u.basic.integer.signedness, | |
699 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
700 | ? "none" | |
701 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
702 | ? "UTF8" | |
703 | : "ASCII", | |
704 | field->type.u.basic.integer.base, | |
8a98a75d | 705 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
706 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
707 | #else | |
708 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
709 | #endif | |
710 | field->name); | |
711 | break; | |
712 | case atype_float: | |
713 | ret = lttng_metadata_printf(session, | |
8a98a75d | 714 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
715 | field->type.u.basic._float.exp_dig, |
716 | field->type.u.basic._float.mant_dig, | |
717 | field->type.u.basic._float.alignment, | |
8a98a75d | 718 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
719 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
720 | #else | |
721 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
722 | #endif | |
723 | field->name); | |
724 | break; | |
725 | case atype_enum: | |
726 | ret = lttng_metadata_printf(session, | |
727 | " %s %s;\n", | |
728 | field->type.u.basic.enumeration.name, | |
729 | field->name); | |
730 | break; | |
731 | case atype_array: | |
732 | { | |
733 | const struct lttng_basic_type *elem_type; | |
734 | ||
735 | elem_type = &field->type.u.array.elem_type; | |
736 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 737 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
738 | elem_type->u.basic.integer.size, |
739 | elem_type->u.basic.integer.alignment, | |
740 | elem_type->u.basic.integer.signedness, | |
741 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
742 | ? "none" | |
743 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
744 | ? "UTF8" | |
745 | : "ASCII", | |
746 | elem_type->u.basic.integer.base, | |
8a98a75d | 747 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
748 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
749 | #else | |
750 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
751 | #endif | |
752 | field->name, field->type.u.array.length); | |
753 | break; | |
754 | } | |
755 | case atype_sequence: | |
756 | { | |
757 | const struct lttng_basic_type *elem_type; | |
758 | const struct lttng_basic_type *length_type; | |
759 | ||
760 | elem_type = &field->type.u.sequence.elem_type; | |
761 | length_type = &field->type.u.sequence.length_type; | |
762 | ret = lttng_metadata_printf(session, | |
763 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
764 | length_type->u.basic.integer.size, | |
765 | (unsigned int) length_type->u.basic.integer.alignment, | |
766 | length_type->u.basic.integer.signedness, | |
767 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
768 | ? "none" | |
769 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
770 | ? "UTF8" | |
771 | : "ASCII"), | |
772 | length_type->u.basic.integer.base, | |
8a98a75d | 773 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
774 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
775 | #else | |
776 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
777 | #endif | |
778 | field->name); | |
779 | if (ret) | |
780 | return ret; | |
781 | ||
782 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 783 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
784 | elem_type->u.basic.integer.size, |
785 | (unsigned int) elem_type->u.basic.integer.alignment, | |
786 | elem_type->u.basic.integer.signedness, | |
787 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
788 | ? "none" | |
789 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
790 | ? "UTF8" | |
791 | : "ASCII"), | |
792 | elem_type->u.basic.integer.base, | |
8a98a75d | 793 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
794 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
795 | #else | |
796 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
797 | #endif | |
798 | field->name, | |
799 | field->name); | |
800 | break; | |
801 | } | |
802 | ||
803 | case atype_string: | |
804 | /* Default encoding is UTF8 */ | |
805 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 806 | " string%s _%s;\n", |
8020ceb5 MD |
807 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
808 | " { encoding = ASCII; }" : "", | |
809 | field->name); | |
810 | break; | |
811 | default: | |
812 | WARN_ON_ONCE(1); | |
813 | return -EINVAL; | |
814 | } | |
815 | return ret; | |
816 | } | |
817 | ||
818 | static | |
819 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
820 | struct lttng_ctx *ctx) | |
821 | { | |
822 | int ret = 0; | |
823 | int i; | |
824 | ||
825 | if (!ctx) | |
826 | return 0; | |
827 | for (i = 0; i < ctx->nr_fields; i++) { | |
828 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
829 | ||
830 | ret = _ltt_field_statedump(session, &field->event_field); | |
831 | if (ret) | |
832 | return ret; | |
833 | } | |
834 | return ret; | |
835 | } | |
836 | ||
837 | static | |
838 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
839 | struct ltt_event *event) | |
840 | { | |
841 | const struct lttng_event_desc *desc = event->desc; | |
842 | int ret = 0; | |
843 | int i; | |
844 | ||
845 | for (i = 0; i < desc->nr_fields; i++) { | |
846 | const struct lttng_event_field *field = &desc->fields[i]; | |
847 | ||
848 | ret = _ltt_field_statedump(session, field); | |
849 | if (ret) | |
850 | return ret; | |
851 | } | |
852 | return ret; | |
853 | } | |
854 | ||
855 | static | |
856 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
857 | struct ltt_channel *chan, | |
858 | struct ltt_event *event) | |
859 | { | |
860 | int ret = 0; | |
861 | ||
b5234c06 | 862 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
863 | return 0; |
864 | if (chan == session->metadata) | |
865 | return 0; | |
8165c8da MD |
866 | /* |
867 | * Don't print events for which probe load is pending. | |
868 | */ | |
869 | if (!event->desc) | |
870 | return 0; | |
8020ceb5 MD |
871 | |
872 | ret = lttng_metadata_printf(session, | |
873 | "event {\n" | |
7083f0fe | 874 | " name = \"%s\";\n" |
8020ceb5 MD |
875 | " id = %u;\n" |
876 | " stream_id = %u;\n", | |
877 | event->desc->name, | |
878 | event->id, | |
879 | event->chan->id); | |
880 | if (ret) | |
881 | goto end; | |
882 | ||
e6c12e3d MD |
883 | if (event->desc->loglevel) { |
884 | const struct tracepoint_loglevel_entry *ll_entry; | |
885 | ||
886 | ll_entry = *event->desc->loglevel; | |
887 | ret = lttng_metadata_printf(session, | |
888 | " loglevel.identifier = \"%s\";\n" | |
889 | " loglevel.value = %lld;\n", | |
890 | ll_entry->identifier, | |
891 | (long long) ll_entry->value); | |
892 | if (ret) | |
893 | goto end; | |
894 | } | |
895 | ||
8020ceb5 MD |
896 | if (event->ctx) { |
897 | ret = lttng_metadata_printf(session, | |
898 | " context := struct {\n"); | |
899 | if (ret) | |
900 | goto end; | |
901 | } | |
902 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
903 | if (ret) | |
904 | goto end; | |
905 | if (event->ctx) { | |
906 | ret = lttng_metadata_printf(session, | |
907 | " };\n"); | |
908 | if (ret) | |
909 | goto end; | |
910 | } | |
911 | ||
912 | ret = lttng_metadata_printf(session, | |
913 | " fields := struct {\n" | |
914 | ); | |
915 | if (ret) | |
916 | goto end; | |
917 | ||
918 | ret = _ltt_fields_metadata_statedump(session, event); | |
919 | if (ret) | |
920 | goto end; | |
921 | ||
922 | /* | |
923 | * LTTng space reservation can only reserve multiples of the | |
924 | * byte size. | |
925 | */ | |
926 | ret = lttng_metadata_printf(session, | |
927 | " };\n" | |
928 | "};\n\n"); | |
929 | if (ret) | |
930 | goto end; | |
931 | ||
932 | event->metadata_dumped = 1; | |
933 | end: | |
934 | return ret; | |
935 | ||
936 | } | |
937 | ||
938 | static | |
939 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
940 | struct ltt_channel *chan) | |
941 | { | |
942 | int ret = 0; | |
943 | ||
b5234c06 | 944 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
945 | return 0; |
946 | if (chan == session->metadata) | |
947 | return 0; | |
948 | ||
949 | WARN_ON_ONCE(!chan->header_type); | |
950 | ret = lttng_metadata_printf(session, | |
951 | "stream {\n" | |
952 | " id = %u;\n" | |
953 | " event.header := %s;\n" | |
954 | " packet.context := struct packet_context;\n", | |
955 | chan->id, | |
956 | chan->header_type == 1 ? "struct event_header_compact" : | |
957 | "struct event_header_large"); | |
958 | if (ret) | |
959 | goto end; | |
960 | ||
961 | if (chan->ctx) { | |
962 | ret = lttng_metadata_printf(session, | |
963 | " event.context := struct {\n"); | |
964 | if (ret) | |
965 | goto end; | |
966 | } | |
967 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
968 | if (ret) | |
969 | goto end; | |
970 | if (chan->ctx) { | |
971 | ret = lttng_metadata_printf(session, | |
972 | " };\n"); | |
973 | if (ret) | |
974 | goto end; | |
975 | } | |
976 | ||
977 | ret = lttng_metadata_printf(session, | |
978 | "};\n\n"); | |
979 | ||
980 | chan->metadata_dumped = 1; | |
981 | end: | |
982 | return ret; | |
983 | } | |
984 | ||
985 | static | |
986 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
987 | { | |
988 | return lttng_metadata_printf(session, | |
989 | "struct packet_context {\n" | |
28b12049 MD |
990 | " uint64_clock_monotonic_t timestamp_begin;\n" |
991 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
992 | " uint32_t events_discarded;\n" |
993 | " uint32_t content_size;\n" | |
994 | " uint32_t packet_size;\n" | |
995 | " uint32_t cpu_id;\n" | |
996 | "};\n\n" | |
997 | ); | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * Compact header: | |
1002 | * id: range: 0 - 30. | |
1003 | * id 31 is reserved to indicate an extended header. | |
1004 | * | |
1005 | * Large header: | |
1006 | * id: range: 0 - 65534. | |
1007 | * id 65535 is reserved to indicate an extended header. | |
1008 | */ | |
1009 | static | |
1010 | int _ltt_event_header_declare(struct ltt_session *session) | |
1011 | { | |
1012 | return lttng_metadata_printf(session, | |
1013 | "struct event_header_compact {\n" | |
1014 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1015 | " variant <id> {\n" | |
1016 | " struct {\n" | |
28b12049 | 1017 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1018 | " } compact;\n" |
1019 | " struct {\n" | |
1020 | " uint32_t id;\n" | |
28b12049 | 1021 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1022 | " } extended;\n" |
1023 | " } v;\n" | |
1024 | "} align(%u);\n" | |
1025 | "\n" | |
1026 | "struct event_header_large {\n" | |
1027 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1028 | " variant <id> {\n" | |
1029 | " struct {\n" | |
28b12049 | 1030 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1031 | " } compact;\n" |
1032 | " struct {\n" | |
1033 | " uint32_t id;\n" | |
28b12049 | 1034 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1035 | " } extended;\n" |
1036 | " } v;\n" | |
1037 | "} align(%u);\n\n", | |
1dbfff0c MD |
1038 | lttng_alignof(uint32_t) * CHAR_BIT, |
1039 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1040 | ); |
1041 | } | |
1042 | ||
28b12049 MD |
1043 | /* |
1044 | * Approximation of NTP time of day to clock monotonic correlation, | |
1045 | * taken at start of trace. | |
1046 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1047 | * in future versions. | |
1048 | */ | |
1049 | static | |
1050 | uint64_t measure_clock_offset(void) | |
1051 | { | |
1052 | uint64_t offset, monotonic[2], realtime; | |
1053 | struct timespec rts = { 0, 0 }; | |
1054 | int ret; | |
1055 | ||
1056 | monotonic[0] = trace_clock_read64(); | |
1057 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1058 | if (ret < 0) | |
1059 | return 0; | |
1060 | monotonic[1] = trace_clock_read64(); | |
1061 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
1062 | realtime = rts.tv_sec * 1000000000ULL; | |
1063 | realtime += rts.tv_nsec; | |
1064 | offset = realtime - offset; | |
1065 | return offset; | |
1066 | } | |
1067 | ||
8020ceb5 MD |
1068 | /* |
1069 | * Output metadata into this session's metadata buffers. | |
1070 | */ | |
1071 | static | |
1072 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1073 | { | |
b5234c06 | 1074 | unsigned char *uuid_c = session->uuid; |
939950af | 1075 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1076 | struct ltt_channel *chan; |
1077 | struct ltt_event *event; | |
1078 | int ret = 0; | |
1079 | ||
b5234c06 | 1080 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1081 | return 0; |
1082 | if (session->metadata_dumped) | |
1083 | goto skip_session; | |
1084 | if (!session->metadata) { | |
b5234c06 | 1085 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1086 | return -EPERM; |
1087 | } | |
1088 | ||
1089 | snprintf(uuid_s, sizeof(uuid_s), | |
1090 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1091 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1092 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1093 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1094 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1095 | ||
1096 | ret = lttng_metadata_printf(session, | |
1097 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1098 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1099 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1100 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1101 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1102 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1103 | "\n" | |
1104 | "trace {\n" | |
1105 | " major = %u;\n" | |
1106 | " minor = %u;\n" | |
1107 | " uuid = \"%s\";\n" | |
1108 | " byte_order = %s;\n" | |
1109 | " packet.header := struct {\n" | |
1110 | " uint32_t magic;\n" | |
1111 | " uint8_t uuid[16];\n" | |
1112 | " uint32_t stream_id;\n" | |
1113 | " };\n" | |
1114 | "};\n\n", | |
1dbfff0c MD |
1115 | lttng_alignof(uint8_t) * CHAR_BIT, |
1116 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1117 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1118 | lttng_alignof(uint64_t) * CHAR_BIT, | |
8020ceb5 MD |
1119 | CTF_VERSION_MAJOR, |
1120 | CTF_VERSION_MINOR, | |
1121 | uuid_s, | |
8a98a75d | 1122 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1123 | "be" |
1124 | #else | |
1125 | "le" | |
1126 | #endif | |
1127 | ); | |
1128 | if (ret) | |
1129 | goto end; | |
1130 | ||
28b12049 MD |
1131 | ret = lttng_metadata_printf(session, |
1132 | "clock {\n" | |
939950af MD |
1133 | " name = %s;\n", |
1134 | "monotonic" | |
1135 | ); | |
1136 | if (ret) | |
1137 | goto end; | |
1138 | ||
1139 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1140 | ret = lttng_metadata_printf(session, | |
1141 | " uuid = \"%s\";\n", | |
1142 | clock_uuid_s | |
1143 | ); | |
1144 | if (ret) | |
1145 | goto end; | |
1146 | } | |
1147 | ||
1148 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1149 | " description = \"Monotonic Clock\";\n" |
1150 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1151 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1152 | " offset = %" PRIu64 ";\n" | |
1153 | "};\n\n", | |
28b12049 MD |
1154 | trace_clock_freq(), |
1155 | measure_clock_offset() | |
1156 | ); | |
1157 | if (ret) | |
1158 | goto end; | |
1159 | ||
1160 | ret = lttng_metadata_printf(session, | |
1161 | "typealias integer {\n" | |
1162 | " size = 27; align = 1; signed = false;\n" | |
1163 | " map = clock.monotonic.value;\n" | |
1164 | "} := uint27_clock_monotonic_t;\n" | |
1165 | "\n" | |
1166 | "typealias integer {\n" | |
1167 | " size = 32; align = %u; signed = false;\n" | |
1168 | " map = clock.monotonic.value;\n" | |
1169 | "} := uint32_clock_monotonic_t;\n" | |
1170 | "\n" | |
1171 | "typealias integer {\n" | |
1172 | " size = 64; align = %u; signed = false;\n" | |
1173 | " map = clock.monotonic.value;\n" | |
1174 | "} := uint64_clock_monotonic_t;\n\n", | |
1175 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1176 | lttng_alignof(uint64_t) * CHAR_BIT | |
1177 | ); | |
1178 | if (ret) | |
1179 | goto end; | |
1180 | ||
8020ceb5 MD |
1181 | ret = _ltt_stream_packet_context_declare(session); |
1182 | if (ret) | |
1183 | goto end; | |
1184 | ||
1185 | ret = _ltt_event_header_declare(session); | |
1186 | if (ret) | |
1187 | goto end; | |
1188 | ||
1189 | skip_session: | |
b5234c06 | 1190 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1191 | ret = _ltt_channel_metadata_statedump(session, chan); |
1192 | if (ret) | |
1193 | goto end; | |
1194 | } | |
1195 | ||
b5234c06 | 1196 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1197 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1198 | if (ret) | |
1199 | goto end; | |
1200 | } | |
1201 | session->metadata_dumped = 1; | |
1202 | end: | |
1203 | return ret; | |
1204 | } | |
1205 | ||
003fedf4 | 1206 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1207 | { |
1208 | struct ltt_session *session, *tmpsession; | |
1209 | ||
b5234c06 | 1210 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1211 | ltt_session_destroy(session); |
8020ceb5 | 1212 | } |