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); | |
e6c12e3d | 80 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
81 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
82 | static int _ltt_event_unregister(struct ltt_event *event); | |
83 | static | |
84 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
85 | struct ltt_channel *chan, | |
86 | struct ltt_event *event); | |
87 | static | |
88 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
89 | ||
8165c8da MD |
90 | /* |
91 | * called at event creation if probe is missing. | |
92 | * called with session mutex held. | |
93 | */ | |
94 | static | |
95 | int add_pending_probe(struct ltt_event *event, const char *name) | |
96 | { | |
97 | struct cds_hlist_head *head; | |
8165c8da | 98 | struct ust_pending_probe *e; |
ff412fb5 MD |
99 | size_t name_len = strlen(name); |
100 | uint32_t hash; | |
8165c8da | 101 | |
ff412fb5 MD |
102 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
103 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
104 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
105 | } | |
106 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
107 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
108 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
109 | if (!e) | |
110 | return -ENOMEM; | |
ff412fb5 MD |
111 | memcpy(&e->name[0], name, name_len + 1); |
112 | e->name[name_len] = '\0'; | |
8165c8da MD |
113 | cds_hlist_add_head(&e->node, head); |
114 | e->event = event; | |
115 | event->pending_probe = e; | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
120 | * remove a pending probe. called when at event teardown and when an | |
121 | * event is fixed (probe is loaded). | |
122 | * called with session mutex held. | |
123 | */ | |
124 | static | |
125 | void remove_pending_probe(struct ust_pending_probe *e) | |
126 | { | |
127 | if (!e) | |
128 | return; | |
129 | cds_hlist_del(&e->node); | |
130 | free(e); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Called at library load: connect the probe on the events pending on | |
135 | * probe load. | |
136 | * called with session mutex held. | |
137 | */ | |
138 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
139 | { | |
140 | struct cds_hlist_head *head; | |
141 | struct cds_hlist_node *node, *p; | |
142 | struct ust_pending_probe *e; | |
143 | const char *name = desc->name; | |
8165c8da | 144 | int ret = 0; |
7ee3cc56 | 145 | struct lttng_ust_event event_param; |
ff412fb5 MD |
146 | size_t name_len = strlen(name); |
147 | uint32_t hash; | |
8165c8da | 148 | |
e6c12e3d MD |
149 | /* Wildcard */ |
150 | { | |
151 | struct wildcard_entry *wildcard; | |
152 | ||
51c5df09 MD |
153 | /* TODO: get value from loglevel. */ |
154 | ||
155 | /* TODO: check if loglevel match */ | |
e6c12e3d MD |
156 | wildcard = match_wildcard(desc->name); |
157 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { | |
158 | struct session_wildcard *sw; | |
159 | ||
160 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
161 | session_list) { | |
162 | struct ltt_event *ev; | |
163 | int ret; | |
164 | ||
165 | memcpy(&event_param, &sw->event_param, | |
166 | sizeof(event_param)); | |
167 | memcpy(event_param.name, | |
168 | desc->name, | |
169 | sizeof(event_param.name)); | |
170 | /* create event */ | |
171 | ret = ltt_event_create(sw->chan, | |
172 | &event_param, NULL, | |
173 | &ev); | |
174 | if (ret) { | |
175 | DBG("Error creating event"); | |
176 | continue; | |
177 | } | |
178 | cds_list_add(&ev->wildcard_list, | |
179 | &sw->events); | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
ff412fb5 MD |
184 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
185 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
186 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
187 | } | |
188 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
189 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
190 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
191 | struct ltt_event *event; | |
192 | struct ltt_channel *chan; | |
193 | ||
51c5df09 MD |
194 | /* TODO: get value from loglevel. */ |
195 | ||
196 | /* TODO: check if loglevel match */ | |
ff412fb5 | 197 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) |
8165c8da MD |
198 | continue; |
199 | event = e->event; | |
200 | chan = event->chan; | |
201 | assert(!event->desc); | |
202 | event->desc = desc; | |
203 | event->pending_probe = NULL; | |
204 | remove_pending_probe(e); | |
205 | ret |= __tracepoint_probe_register(name, | |
206 | event->desc->probe_callback, | |
207 | event); | |
636c5aa4 MD |
208 | if (ret) |
209 | continue; | |
210 | event->id = chan->free_event_id++; | |
8165c8da MD |
211 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
212 | event); | |
213 | } | |
214 | return ret; | |
215 | } | |
216 | ||
8020ceb5 MD |
217 | void synchronize_trace(void) |
218 | { | |
8020ceb5 | 219 | synchronize_rcu(); |
8020ceb5 MD |
220 | } |
221 | ||
222 | struct ltt_session *ltt_session_create(void) | |
223 | { | |
224 | struct ltt_session *session; | |
225 | ||
b5234c06 | 226 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
227 | if (!session) |
228 | return NULL; | |
b5234c06 MD |
229 | CDS_INIT_LIST_HEAD(&session->chan); |
230 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 231 | CDS_INIT_LIST_HEAD(&session->wildcards); |
b5234c06 MD |
232 | uuid_generate(session->uuid); |
233 | cds_list_add(&session->list, &sessions); | |
8020ceb5 MD |
234 | return session; |
235 | } | |
236 | ||
237 | void ltt_session_destroy(struct ltt_session *session) | |
238 | { | |
239 | struct ltt_channel *chan, *tmpchan; | |
240 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 241 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
242 | int ret; |
243 | ||
b5234c06 MD |
244 | CMM_ACCESS_ONCE(session->active) = 0; |
245 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
246 | ret = _ltt_event_unregister(event); |
247 | WARN_ON(ret); | |
248 | } | |
249 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
250 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
251 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 252 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 253 | _ltt_event_destroy(event); |
b5234c06 | 254 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 255 | _ltt_channel_destroy(chan); |
b5234c06 | 256 | cds_list_del(&session->list); |
b5234c06 | 257 | free(session); |
8020ceb5 MD |
258 | } |
259 | ||
976fe9ea | 260 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
261 | { |
262 | int ret = 0; | |
263 | struct ltt_channel *chan; | |
264 | ||
8020ceb5 MD |
265 | if (session->active) { |
266 | ret = -EBUSY; | |
267 | goto end; | |
268 | } | |
269 | ||
270 | /* | |
271 | * Snapshot the number of events per channel to know the type of header | |
272 | * we need to use. | |
273 | */ | |
b5234c06 | 274 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
275 | if (chan->header_type) |
276 | continue; /* don't change it if session stop/restart */ | |
277 | if (chan->free_event_id < 31) | |
278 | chan->header_type = 1; /* compact */ | |
279 | else | |
280 | chan->header_type = 2; /* large */ | |
281 | } | |
282 | ||
b5234c06 MD |
283 | CMM_ACCESS_ONCE(session->active) = 1; |
284 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 285 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 286 | if (ret) |
b5234c06 | 287 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 288 | end: |
8020ceb5 MD |
289 | return ret; |
290 | } | |
291 | ||
976fe9ea | 292 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
293 | { |
294 | int ret = 0; | |
295 | ||
8020ceb5 MD |
296 | if (!session->active) { |
297 | ret = -EBUSY; | |
298 | goto end; | |
299 | } | |
b5234c06 | 300 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 301 | end: |
8020ceb5 MD |
302 | return ret; |
303 | } | |
304 | ||
976fe9ea MD |
305 | int ltt_channel_enable(struct ltt_channel *channel) |
306 | { | |
307 | int old; | |
308 | ||
9beb36ba MD |
309 | if (channel == channel->session->metadata) |
310 | return -EPERM; | |
b5234c06 | 311 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
312 | if (old) |
313 | return -EEXIST; | |
314 | return 0; | |
315 | } | |
316 | ||
317 | int ltt_channel_disable(struct ltt_channel *channel) | |
318 | { | |
319 | int old; | |
320 | ||
9beb36ba MD |
321 | if (channel == channel->session->metadata) |
322 | return -EPERM; | |
b5234c06 | 323 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
324 | if (!old) |
325 | return -EEXIST; | |
326 | return 0; | |
327 | } | |
328 | ||
329 | int ltt_event_enable(struct ltt_event *event) | |
330 | { | |
331 | int old; | |
332 | ||
9beb36ba MD |
333 | if (event->chan == event->chan->session->metadata) |
334 | return -EPERM; | |
b5234c06 | 335 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
336 | if (old) |
337 | return -EEXIST; | |
338 | return 0; | |
339 | } | |
340 | ||
341 | int ltt_event_disable(struct ltt_event *event) | |
342 | { | |
343 | int old; | |
344 | ||
9beb36ba MD |
345 | if (event->chan == event->chan->session->metadata) |
346 | return -EPERM; | |
b5234c06 | 347 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
348 | if (!old) |
349 | return -EEXIST; | |
350 | return 0; | |
351 | } | |
352 | ||
8020ceb5 MD |
353 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
354 | const char *transport_name, | |
355 | void *buf_addr, | |
356 | size_t subbuf_size, size_t num_subbuf, | |
357 | unsigned int switch_timer_interval, | |
193183fb | 358 | unsigned int read_timer_interval, |
ef9ff354 MD |
359 | int **shm_fd, int **wait_fd, |
360 | uint64_t **memory_map_size, | |
d028eddb | 361 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 362 | { |
a3f61e7f | 363 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
364 | struct ltt_transport *transport; |
365 | ||
8020ceb5 MD |
366 | if (session->been_active) |
367 | goto active; /* Refuse to add channel to active session */ | |
368 | transport = ltt_transport_find(transport_name); | |
369 | if (!transport) { | |
b5234c06 | 370 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
371 | transport_name); |
372 | goto notransport; | |
373 | } | |
d028eddb MD |
374 | chan_priv_init->id = session->free_chan_id++; |
375 | chan_priv_init->session = session; | |
8020ceb5 MD |
376 | /* |
377 | * Note: the channel creation op already writes into the packet | |
378 | * headers. Therefore the "chan" information used as input | |
379 | * should be already accessible. | |
380 | */ | |
a3f61e7f | 381 | chan = transport->ops.channel_create("[lttng]", buf_addr, |
8020ceb5 | 382 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 383 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 384 | memory_map_size, chan_priv_init); |
a3f61e7f | 385 | if (!chan) |
8020ceb5 | 386 | goto create_error; |
976fe9ea | 387 | chan->enabled = 1; |
8020ceb5 | 388 | chan->ops = &transport->ops; |
b5234c06 | 389 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
390 | return chan; |
391 | ||
392 | create_error: | |
8020ceb5 MD |
393 | notransport: |
394 | active: | |
8020ceb5 MD |
395 | return NULL; |
396 | } | |
397 | ||
398 | /* | |
399 | * Only used internally at session destruction. | |
400 | */ | |
401 | static | |
402 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
403 | { | |
b5234c06 | 404 | cds_list_del(&chan->list); |
8020ceb5 | 405 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 406 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
407 | } |
408 | ||
e6c12e3d MD |
409 | int ltt_wildcard_create(struct ltt_channel *chan, |
410 | struct lttng_ust_event *event_param, | |
411 | struct session_wildcard **_sw) | |
412 | { | |
413 | struct session_wildcard *sw; | |
414 | ||
415 | sw = add_wildcard(event_param->name, chan, event_param); | |
416 | if (!sw || IS_ERR(sw)) { | |
417 | return PTR_ERR(sw); | |
418 | } | |
419 | *_sw = sw; | |
420 | return 0; | |
421 | } | |
422 | ||
423 | static | |
424 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
425 | { | |
426 | _remove_wildcard(sw); | |
427 | } | |
428 | ||
8020ceb5 MD |
429 | /* |
430 | * Supports event creation while tracing session is active. | |
431 | */ | |
576599a0 MD |
432 | int ltt_event_create(struct ltt_channel *chan, |
433 | struct lttng_ust_event *event_param, | |
434 | void *filter, | |
435 | struct ltt_event **_event) | |
8020ceb5 MD |
436 | { |
437 | struct ltt_event *event; | |
576599a0 | 438 | int ret = 0; |
8020ceb5 | 439 | |
576599a0 MD |
440 | if (chan->used_event_id == -1UL) { |
441 | ret = -ENOMEM; | |
8020ceb5 | 442 | goto full; |
576599a0 | 443 | } |
8020ceb5 MD |
444 | /* |
445 | * This is O(n^2) (for each event, the loop is called at event | |
446 | * creation). Might require a hash if we have lots of events. | |
447 | */ | |
576599a0 | 448 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
449 | if (event->desc && !strncmp(event->desc->name, |
450 | event_param->name, | |
451 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 452 | ret = -EEXIST; |
8020ceb5 | 453 | goto exist; |
576599a0 MD |
454 | } |
455 | } | |
b5234c06 | 456 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
457 | if (!event) { |
458 | ret = -ENOMEM; | |
8020ceb5 | 459 | goto cache_error; |
576599a0 | 460 | } |
8020ceb5 MD |
461 | event->chan = chan; |
462 | event->filter = filter; | |
8165c8da MD |
463 | /* |
464 | * used_event_id counts the maximum number of event IDs that can | |
465 | * register if all probes register. | |
466 | */ | |
467 | chan->used_event_id++; | |
976fe9ea | 468 | event->enabled = 1; |
8020ceb5 MD |
469 | event->instrumentation = event_param->instrumentation; |
470 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 471 | cmm_smp_wmb(); |
8020ceb5 | 472 | switch (event_param->instrumentation) { |
b5234c06 | 473 | case LTTNG_UST_TRACEPOINT: |
8020ceb5 | 474 | event->desc = ltt_event_get(event_param->name); |
51c5df09 MD |
475 | /* TODO: get value from loglevel. */ |
476 | ||
477 | /* TODO: check if loglevel match */ | |
8165c8da MD |
478 | if (event->desc) { |
479 | ret = __tracepoint_probe_register(event_param->name, | |
480 | event->desc->probe_callback, | |
481 | event); | |
482 | if (ret) | |
483 | goto register_error; | |
484 | event->id = chan->free_event_id++; | |
485 | } else { | |
486 | /* | |
487 | * If the probe is not present, event->desc stays NULL, | |
488 | * waiting for the probe to register, and the event->id | |
489 | * stays unallocated. | |
490 | */ | |
491 | ret = add_pending_probe(event, event_param->name); | |
492 | if (ret) | |
493 | goto add_pending_error; | |
494 | } | |
8020ceb5 | 495 | break; |
8020ceb5 MD |
496 | default: |
497 | WARN_ON_ONCE(1); | |
498 | } | |
8165c8da MD |
499 | if (event->desc) { |
500 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
501 | if (ret) | |
502 | goto statedump_error; | |
503 | } | |
b5234c06 | 504 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
505 | *_event = event; |
506 | return 0; | |
8020ceb5 MD |
507 | |
508 | statedump_error: | |
8165c8da MD |
509 | if (event->desc) { |
510 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
511 | event->desc->probe_callback, | |
512 | event)); | |
513 | ltt_event_put(event->desc); | |
514 | } | |
515 | add_pending_error: | |
8020ceb5 | 516 | register_error: |
b5234c06 | 517 | free(event); |
8020ceb5 MD |
518 | cache_error: |
519 | exist: | |
520 | full: | |
576599a0 | 521 | return ret; |
8020ceb5 MD |
522 | } |
523 | ||
524 | /* | |
525 | * Only used internally at session destruction. | |
526 | */ | |
527 | int _ltt_event_unregister(struct ltt_event *event) | |
528 | { | |
529 | int ret = -EINVAL; | |
530 | ||
531 | switch (event->instrumentation) { | |
b5234c06 | 532 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
533 | if (event->desc) { |
534 | ret = __tracepoint_probe_unregister(event->desc->name, | |
535 | event->desc->probe_callback, | |
536 | event); | |
537 | if (ret) | |
538 | return ret; | |
539 | } else { | |
540 | remove_pending_probe(event->pending_probe); | |
541 | ret = 0; | |
542 | } | |
8020ceb5 | 543 | break; |
8020ceb5 MD |
544 | default: |
545 | WARN_ON_ONCE(1); | |
546 | } | |
547 | return ret; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Only used internally at session destruction. | |
552 | */ | |
553 | static | |
554 | void _ltt_event_destroy(struct ltt_event *event) | |
555 | { | |
556 | switch (event->instrumentation) { | |
b5234c06 | 557 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
558 | if (event->desc) { |
559 | ltt_event_put(event->desc); | |
560 | } | |
8020ceb5 | 561 | break; |
8020ceb5 MD |
562 | default: |
563 | WARN_ON_ONCE(1); | |
564 | } | |
b5234c06 | 565 | cds_list_del(&event->list); |
8020ceb5 | 566 | lttng_destroy_context(event->ctx); |
b5234c06 | 567 | free(event); |
8020ceb5 MD |
568 | } |
569 | ||
570 | /* | |
571 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 572 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
573 | * remaining space left in packet and write, since mutual exclusion |
574 | * protects us from concurrent writes. | |
575 | */ | |
576 | int lttng_metadata_printf(struct ltt_session *session, | |
577 | const char *fmt, ...) | |
578 | { | |
4cfec15c | 579 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 580 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 581 | char *str = NULL; |
8020ceb5 MD |
582 | int ret = 0, waitret; |
583 | size_t len, reserve_len, pos; | |
584 | va_list ap; | |
585 | ||
b5234c06 | 586 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
587 | |
588 | va_start(ap, fmt); | |
b5234c06 | 589 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 590 | va_end(ap); |
b5234c06 | 591 | if (ret < 0) |
8020ceb5 MD |
592 | return -ENOMEM; |
593 | ||
594 | len = strlen(str); | |
595 | pos = 0; | |
596 | ||
597 | for (pos = 0; pos < len; pos += reserve_len) { | |
598 | reserve_len = min_t(size_t, | |
1d498196 | 599 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
600 | len - pos); |
601 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 602 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
603 | /* |
604 | * We don't care about metadata buffer's records lost | |
605 | * count, because we always retry here. Report error if | |
606 | * we need to bail out after timeout or being | |
607 | * interrupted. | |
608 | */ | |
b5234c06 | 609 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
610 | ({ |
611 | ret = chan->ops->event_reserve(&ctx, 0); | |
612 | ret != -ENOBUFS || !ret; | |
613 | }), | |
b5234c06 | 614 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 615 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
616 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
617 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 618 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 619 | if (waitret == -EINTR) |
8020ceb5 MD |
620 | ret = waitret; |
621 | goto end; | |
622 | } | |
623 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
624 | chan->ops->event_commit(&ctx); | |
625 | } | |
626 | end: | |
b5234c06 | 627 | free(str); |
8020ceb5 MD |
628 | return ret; |
629 | } | |
630 | ||
631 | static | |
632 | int _ltt_field_statedump(struct ltt_session *session, | |
633 | const struct lttng_event_field *field) | |
634 | { | |
635 | int ret = 0; | |
636 | ||
637 | switch (field->type.atype) { | |
638 | case atype_integer: | |
639 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 640 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
641 | field->type.u.basic.integer.size, |
642 | field->type.u.basic.integer.alignment, | |
643 | field->type.u.basic.integer.signedness, | |
644 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
645 | ? "none" | |
646 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
647 | ? "UTF8" | |
648 | : "ASCII", | |
649 | field->type.u.basic.integer.base, | |
8a98a75d | 650 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
651 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
652 | #else | |
653 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
654 | #endif | |
655 | field->name); | |
656 | break; | |
657 | case atype_float: | |
658 | ret = lttng_metadata_printf(session, | |
8a98a75d | 659 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
660 | field->type.u.basic._float.exp_dig, |
661 | field->type.u.basic._float.mant_dig, | |
662 | field->type.u.basic._float.alignment, | |
8a98a75d | 663 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
664 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
665 | #else | |
666 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
667 | #endif | |
668 | field->name); | |
669 | break; | |
670 | case atype_enum: | |
671 | ret = lttng_metadata_printf(session, | |
672 | " %s %s;\n", | |
673 | field->type.u.basic.enumeration.name, | |
674 | field->name); | |
675 | break; | |
676 | case atype_array: | |
677 | { | |
678 | const struct lttng_basic_type *elem_type; | |
679 | ||
680 | elem_type = &field->type.u.array.elem_type; | |
681 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 682 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
683 | elem_type->u.basic.integer.size, |
684 | elem_type->u.basic.integer.alignment, | |
685 | elem_type->u.basic.integer.signedness, | |
686 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
687 | ? "none" | |
688 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
689 | ? "UTF8" | |
690 | : "ASCII", | |
691 | elem_type->u.basic.integer.base, | |
8a98a75d | 692 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
693 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
694 | #else | |
695 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
696 | #endif | |
697 | field->name, field->type.u.array.length); | |
698 | break; | |
699 | } | |
700 | case atype_sequence: | |
701 | { | |
702 | const struct lttng_basic_type *elem_type; | |
703 | const struct lttng_basic_type *length_type; | |
704 | ||
705 | elem_type = &field->type.u.sequence.elem_type; | |
706 | length_type = &field->type.u.sequence.length_type; | |
707 | ret = lttng_metadata_printf(session, | |
708 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
709 | length_type->u.basic.integer.size, | |
710 | (unsigned int) length_type->u.basic.integer.alignment, | |
711 | length_type->u.basic.integer.signedness, | |
712 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
713 | ? "none" | |
714 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
715 | ? "UTF8" | |
716 | : "ASCII"), | |
717 | length_type->u.basic.integer.base, | |
8a98a75d | 718 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
719 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
720 | #else | |
721 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
722 | #endif | |
723 | field->name); | |
724 | if (ret) | |
725 | return ret; | |
726 | ||
727 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 728 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
729 | elem_type->u.basic.integer.size, |
730 | (unsigned int) elem_type->u.basic.integer.alignment, | |
731 | elem_type->u.basic.integer.signedness, | |
732 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
733 | ? "none" | |
734 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
735 | ? "UTF8" | |
736 | : "ASCII"), | |
737 | elem_type->u.basic.integer.base, | |
8a98a75d | 738 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
739 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
740 | #else | |
741 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
742 | #endif | |
743 | field->name, | |
744 | field->name); | |
745 | break; | |
746 | } | |
747 | ||
748 | case atype_string: | |
749 | /* Default encoding is UTF8 */ | |
750 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 751 | " string%s _%s;\n", |
8020ceb5 MD |
752 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
753 | " { encoding = ASCII; }" : "", | |
754 | field->name); | |
755 | break; | |
756 | default: | |
757 | WARN_ON_ONCE(1); | |
758 | return -EINVAL; | |
759 | } | |
760 | return ret; | |
761 | } | |
762 | ||
763 | static | |
764 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
765 | struct lttng_ctx *ctx) | |
766 | { | |
767 | int ret = 0; | |
768 | int i; | |
769 | ||
770 | if (!ctx) | |
771 | return 0; | |
772 | for (i = 0; i < ctx->nr_fields; i++) { | |
773 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
774 | ||
775 | ret = _ltt_field_statedump(session, &field->event_field); | |
776 | if (ret) | |
777 | return ret; | |
778 | } | |
779 | return ret; | |
780 | } | |
781 | ||
782 | static | |
783 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
784 | struct ltt_event *event) | |
785 | { | |
786 | const struct lttng_event_desc *desc = event->desc; | |
787 | int ret = 0; | |
788 | int i; | |
789 | ||
790 | for (i = 0; i < desc->nr_fields; i++) { | |
791 | const struct lttng_event_field *field = &desc->fields[i]; | |
792 | ||
793 | ret = _ltt_field_statedump(session, field); | |
794 | if (ret) | |
795 | return ret; | |
796 | } | |
797 | return ret; | |
798 | } | |
799 | ||
800 | static | |
801 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
802 | struct ltt_channel *chan, | |
803 | struct ltt_event *event) | |
804 | { | |
805 | int ret = 0; | |
806 | ||
b5234c06 | 807 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
808 | return 0; |
809 | if (chan == session->metadata) | |
810 | return 0; | |
8165c8da MD |
811 | /* |
812 | * Don't print events for which probe load is pending. | |
813 | */ | |
814 | if (!event->desc) | |
815 | return 0; | |
8020ceb5 MD |
816 | |
817 | ret = lttng_metadata_printf(session, | |
818 | "event {\n" | |
7083f0fe | 819 | " name = \"%s\";\n" |
8020ceb5 MD |
820 | " id = %u;\n" |
821 | " stream_id = %u;\n", | |
822 | event->desc->name, | |
823 | event->id, | |
824 | event->chan->id); | |
825 | if (ret) | |
826 | goto end; | |
827 | ||
e6c12e3d MD |
828 | if (event->desc->loglevel) { |
829 | const struct tracepoint_loglevel_entry *ll_entry; | |
830 | ||
831 | ll_entry = *event->desc->loglevel; | |
832 | ret = lttng_metadata_printf(session, | |
833 | " loglevel.identifier = \"%s\";\n" | |
834 | " loglevel.value = %lld;\n", | |
835 | ll_entry->identifier, | |
836 | (long long) ll_entry->value); | |
837 | if (ret) | |
838 | goto end; | |
839 | } | |
840 | ||
8020ceb5 MD |
841 | if (event->ctx) { |
842 | ret = lttng_metadata_printf(session, | |
843 | " context := struct {\n"); | |
844 | if (ret) | |
845 | goto end; | |
846 | } | |
847 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
848 | if (ret) | |
849 | goto end; | |
850 | if (event->ctx) { | |
851 | ret = lttng_metadata_printf(session, | |
852 | " };\n"); | |
853 | if (ret) | |
854 | goto end; | |
855 | } | |
856 | ||
857 | ret = lttng_metadata_printf(session, | |
858 | " fields := struct {\n" | |
859 | ); | |
860 | if (ret) | |
861 | goto end; | |
862 | ||
863 | ret = _ltt_fields_metadata_statedump(session, event); | |
864 | if (ret) | |
865 | goto end; | |
866 | ||
867 | /* | |
868 | * LTTng space reservation can only reserve multiples of the | |
869 | * byte size. | |
870 | */ | |
871 | ret = lttng_metadata_printf(session, | |
872 | " };\n" | |
873 | "};\n\n"); | |
874 | if (ret) | |
875 | goto end; | |
876 | ||
877 | event->metadata_dumped = 1; | |
878 | end: | |
879 | return ret; | |
880 | ||
881 | } | |
882 | ||
883 | static | |
884 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
885 | struct ltt_channel *chan) | |
886 | { | |
887 | int ret = 0; | |
888 | ||
b5234c06 | 889 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
890 | return 0; |
891 | if (chan == session->metadata) | |
892 | return 0; | |
893 | ||
894 | WARN_ON_ONCE(!chan->header_type); | |
895 | ret = lttng_metadata_printf(session, | |
896 | "stream {\n" | |
897 | " id = %u;\n" | |
898 | " event.header := %s;\n" | |
899 | " packet.context := struct packet_context;\n", | |
900 | chan->id, | |
901 | chan->header_type == 1 ? "struct event_header_compact" : | |
902 | "struct event_header_large"); | |
903 | if (ret) | |
904 | goto end; | |
905 | ||
906 | if (chan->ctx) { | |
907 | ret = lttng_metadata_printf(session, | |
908 | " event.context := struct {\n"); | |
909 | if (ret) | |
910 | goto end; | |
911 | } | |
912 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
913 | if (ret) | |
914 | goto end; | |
915 | if (chan->ctx) { | |
916 | ret = lttng_metadata_printf(session, | |
917 | " };\n"); | |
918 | if (ret) | |
919 | goto end; | |
920 | } | |
921 | ||
922 | ret = lttng_metadata_printf(session, | |
923 | "};\n\n"); | |
924 | ||
925 | chan->metadata_dumped = 1; | |
926 | end: | |
927 | return ret; | |
928 | } | |
929 | ||
930 | static | |
931 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
932 | { | |
933 | return lttng_metadata_printf(session, | |
934 | "struct packet_context {\n" | |
28b12049 MD |
935 | " uint64_clock_monotonic_t timestamp_begin;\n" |
936 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
937 | " uint32_t events_discarded;\n" |
938 | " uint32_t content_size;\n" | |
939 | " uint32_t packet_size;\n" | |
940 | " uint32_t cpu_id;\n" | |
941 | "};\n\n" | |
942 | ); | |
943 | } | |
944 | ||
945 | /* | |
946 | * Compact header: | |
947 | * id: range: 0 - 30. | |
948 | * id 31 is reserved to indicate an extended header. | |
949 | * | |
950 | * Large header: | |
951 | * id: range: 0 - 65534. | |
952 | * id 65535 is reserved to indicate an extended header. | |
953 | */ | |
954 | static | |
955 | int _ltt_event_header_declare(struct ltt_session *session) | |
956 | { | |
957 | return lttng_metadata_printf(session, | |
958 | "struct event_header_compact {\n" | |
959 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
960 | " variant <id> {\n" | |
961 | " struct {\n" | |
28b12049 | 962 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
963 | " } compact;\n" |
964 | " struct {\n" | |
965 | " uint32_t id;\n" | |
28b12049 | 966 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
967 | " } extended;\n" |
968 | " } v;\n" | |
969 | "} align(%u);\n" | |
970 | "\n" | |
971 | "struct event_header_large {\n" | |
972 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
973 | " variant <id> {\n" | |
974 | " struct {\n" | |
28b12049 | 975 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
976 | " } compact;\n" |
977 | " struct {\n" | |
978 | " uint32_t id;\n" | |
28b12049 | 979 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
980 | " } extended;\n" |
981 | " } v;\n" | |
982 | "} align(%u);\n\n", | |
1dbfff0c MD |
983 | lttng_alignof(uint32_t) * CHAR_BIT, |
984 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
985 | ); |
986 | } | |
987 | ||
28b12049 MD |
988 | /* |
989 | * Approximation of NTP time of day to clock monotonic correlation, | |
990 | * taken at start of trace. | |
991 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
992 | * in future versions. | |
993 | */ | |
994 | static | |
995 | uint64_t measure_clock_offset(void) | |
996 | { | |
997 | uint64_t offset, monotonic[2], realtime; | |
998 | struct timespec rts = { 0, 0 }; | |
999 | int ret; | |
1000 | ||
1001 | monotonic[0] = trace_clock_read64(); | |
1002 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1003 | if (ret < 0) | |
1004 | return 0; | |
1005 | monotonic[1] = trace_clock_read64(); | |
1006 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
1007 | realtime = rts.tv_sec * 1000000000ULL; | |
1008 | realtime += rts.tv_nsec; | |
1009 | offset = realtime - offset; | |
1010 | return offset; | |
1011 | } | |
1012 | ||
8020ceb5 MD |
1013 | /* |
1014 | * Output metadata into this session's metadata buffers. | |
1015 | */ | |
1016 | static | |
1017 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1018 | { | |
b5234c06 | 1019 | unsigned char *uuid_c = session->uuid; |
939950af | 1020 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1021 | struct ltt_channel *chan; |
1022 | struct ltt_event *event; | |
1023 | int ret = 0; | |
1024 | ||
b5234c06 | 1025 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1026 | return 0; |
1027 | if (session->metadata_dumped) | |
1028 | goto skip_session; | |
1029 | if (!session->metadata) { | |
b5234c06 | 1030 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1031 | return -EPERM; |
1032 | } | |
1033 | ||
1034 | snprintf(uuid_s, sizeof(uuid_s), | |
1035 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1036 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1037 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1038 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1039 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1040 | ||
1041 | ret = lttng_metadata_printf(session, | |
1042 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1043 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1044 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1045 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1046 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1047 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1048 | "\n" | |
1049 | "trace {\n" | |
1050 | " major = %u;\n" | |
1051 | " minor = %u;\n" | |
1052 | " uuid = \"%s\";\n" | |
1053 | " byte_order = %s;\n" | |
1054 | " packet.header := struct {\n" | |
1055 | " uint32_t magic;\n" | |
1056 | " uint8_t uuid[16];\n" | |
1057 | " uint32_t stream_id;\n" | |
1058 | " };\n" | |
1059 | "};\n\n", | |
1dbfff0c MD |
1060 | lttng_alignof(uint8_t) * CHAR_BIT, |
1061 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1062 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1063 | lttng_alignof(uint64_t) * CHAR_BIT, | |
8020ceb5 MD |
1064 | CTF_VERSION_MAJOR, |
1065 | CTF_VERSION_MINOR, | |
1066 | uuid_s, | |
8a98a75d | 1067 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1068 | "be" |
1069 | #else | |
1070 | "le" | |
1071 | #endif | |
1072 | ); | |
1073 | if (ret) | |
1074 | goto end; | |
1075 | ||
28b12049 MD |
1076 | ret = lttng_metadata_printf(session, |
1077 | "clock {\n" | |
939950af MD |
1078 | " name = %s;\n", |
1079 | "monotonic" | |
1080 | ); | |
1081 | if (ret) | |
1082 | goto end; | |
1083 | ||
1084 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1085 | ret = lttng_metadata_printf(session, | |
1086 | " uuid = \"%s\";\n", | |
1087 | clock_uuid_s | |
1088 | ); | |
1089 | if (ret) | |
1090 | goto end; | |
1091 | } | |
1092 | ||
1093 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1094 | " description = \"Monotonic Clock\";\n" |
1095 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1096 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1097 | " offset = %" PRIu64 ";\n" | |
1098 | "};\n\n", | |
28b12049 MD |
1099 | trace_clock_freq(), |
1100 | measure_clock_offset() | |
1101 | ); | |
1102 | if (ret) | |
1103 | goto end; | |
1104 | ||
1105 | ret = lttng_metadata_printf(session, | |
1106 | "typealias integer {\n" | |
1107 | " size = 27; align = 1; signed = false;\n" | |
1108 | " map = clock.monotonic.value;\n" | |
1109 | "} := uint27_clock_monotonic_t;\n" | |
1110 | "\n" | |
1111 | "typealias integer {\n" | |
1112 | " size = 32; align = %u; signed = false;\n" | |
1113 | " map = clock.monotonic.value;\n" | |
1114 | "} := uint32_clock_monotonic_t;\n" | |
1115 | "\n" | |
1116 | "typealias integer {\n" | |
1117 | " size = 64; align = %u; signed = false;\n" | |
1118 | " map = clock.monotonic.value;\n" | |
1119 | "} := uint64_clock_monotonic_t;\n\n", | |
1120 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1121 | lttng_alignof(uint64_t) * CHAR_BIT | |
1122 | ); | |
1123 | if (ret) | |
1124 | goto end; | |
1125 | ||
8020ceb5 MD |
1126 | ret = _ltt_stream_packet_context_declare(session); |
1127 | if (ret) | |
1128 | goto end; | |
1129 | ||
1130 | ret = _ltt_event_header_declare(session); | |
1131 | if (ret) | |
1132 | goto end; | |
1133 | ||
1134 | skip_session: | |
b5234c06 | 1135 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1136 | ret = _ltt_channel_metadata_statedump(session, chan); |
1137 | if (ret) | |
1138 | goto end; | |
1139 | } | |
1140 | ||
b5234c06 | 1141 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1142 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1143 | if (ret) | |
1144 | goto end; | |
1145 | } | |
1146 | session->metadata_dumped = 1; | |
1147 | end: | |
1148 | return ret; | |
1149 | } | |
1150 | ||
003fedf4 | 1151 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1152 | { |
1153 | struct ltt_session *session, *tmpsession; | |
1154 | ||
b5234c06 | 1155 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1156 | ltt_session_destroy(session); |
8020ceb5 | 1157 | } |