Commit | Line | Data |
---|---|---|
826d496d | 1 | /* |
b7384347 DG |
2 | * lttng.h |
3 | * | |
4 | * Linux Trace Toolkit Control Library Header File | |
5 | * | |
826d496d | 6 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
fac6795d | 7 | * |
1e46a50f | 8 | * This library is free software; you can redistribute it and/or modify it |
d14d33bf AM |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
10 | * as published by the Free Software Foundation. | |
82a3637f | 11 | * |
1e46a50f TD |
12 | * This library is distributed in the hope that it will be useful, but WITHOUT |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
15 | * for more details. | |
82a3637f | 16 | * |
1e46a50f TD |
17 | * You should have received a copy of the GNU Lesser General Public License |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
fac6795d DG |
20 | */ |
21 | ||
b7384347 DG |
22 | #ifndef _LTTNG_H |
23 | #define _LTTNG_H | |
fac6795d | 24 | |
57167058 | 25 | #include <limits.h> |
1e307fab DG |
26 | #include <stdint.h> |
27 | #include <sys/types.h> | |
57167058 | 28 | |
b7384347 | 29 | /* |
e6ddca71 | 30 | * Event symbol length. Copied from LTTng kernel ABI. |
1657e9bb | 31 | */ |
8d326ab9 | 32 | #define LTTNG_SYMBOL_NAME_LEN 256 |
f3ed775e | 33 | |
e6ddca71 DG |
34 | /* |
35 | * Every lttng_event_* structure both apply to kernel event and user-space | |
36 | * event. | |
e6ddca71 DG |
37 | */ |
38 | ||
7d29a247 | 39 | /* |
1e46a50f | 40 | * Domain types: the different possible tracers. |
7d29a247 DG |
41 | */ |
42 | enum lttng_domain_type { | |
0d0c377a DG |
43 | LTTNG_DOMAIN_KERNEL = 1, |
44 | LTTNG_DOMAIN_UST = 2, | |
d78d6610 DG |
45 | |
46 | /* | |
47 | * For now, the domains below are not implemented. However, we keep them | |
48 | * here in order to retain their enum values for future development. Note | |
49 | * that it is on the roadmap to implement them. | |
50 | * | |
0d0c377a DG |
51 | LTTNG_DOMAIN_UST_EXEC_NAME = 3, |
52 | LTTNG_DOMAIN_UST_PID = 4, | |
53 | LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5, | |
d78d6610 | 54 | */ |
7d29a247 DG |
55 | }; |
56 | ||
7d29a247 DG |
57 | /* |
58 | * Instrumentation type of tracing event. | |
59 | */ | |
f3ed775e | 60 | enum lttng_event_type { |
7a3d1328 MD |
61 | LTTNG_EVENT_ALL = -1, |
62 | LTTNG_EVENT_TRACEPOINT = 0, | |
63 | LTTNG_EVENT_PROBE = 1, | |
64 | LTTNG_EVENT_FUNCTION = 2, | |
65 | LTTNG_EVENT_FUNCTION_ENTRY = 3, | |
66 | LTTNG_EVENT_NOOP = 4, | |
67 | LTTNG_EVENT_SYSCALL = 5, | |
0cda4f28 MD |
68 | }; |
69 | ||
70 | /* | |
71 | * Loglevel information. | |
72 | */ | |
73 | enum lttng_loglevel_type { | |
8005f29a MD |
74 | LTTNG_EVENT_LOGLEVEL_ALL = 0, |
75 | LTTNG_EVENT_LOGLEVEL_RANGE = 1, | |
76 | LTTNG_EVENT_LOGLEVEL_SINGLE = 2, | |
1657e9bb DG |
77 | }; |
78 | ||
46839cc2 MD |
79 | /* |
80 | * Available loglevels. | |
81 | */ | |
82 | enum lttng_loglevel { | |
83 | LTTNG_LOGLEVEL_EMERG = 0, | |
84 | LTTNG_LOGLEVEL_ALERT = 1, | |
85 | LTTNG_LOGLEVEL_CRIT = 2, | |
86 | LTTNG_LOGLEVEL_ERR = 3, | |
87 | LTTNG_LOGLEVEL_WARNING = 4, | |
88 | LTTNG_LOGLEVEL_NOTICE = 5, | |
89 | LTTNG_LOGLEVEL_INFO = 6, | |
90 | LTTNG_LOGLEVEL_DEBUG_SYSTEM = 7, | |
91 | LTTNG_LOGLEVEL_DEBUG_PROGRAM = 8, | |
92 | LTTNG_LOGLEVEL_DEBUG_PROCESS = 9, | |
93 | LTTNG_LOGLEVEL_DEBUG_MODULE = 10, | |
94 | LTTNG_LOGLEVEL_DEBUG_UNIT = 11, | |
95 | LTTNG_LOGLEVEL_DEBUG_FUNCTION = 12, | |
96 | LTTNG_LOGLEVEL_DEBUG_LINE = 13, | |
97 | LTTNG_LOGLEVEL_DEBUG = 14, | |
98 | }; | |
99 | ||
e6ddca71 DG |
100 | /* |
101 | * LTTng consumer mode | |
102 | */ | |
103 | enum lttng_event_output { | |
d78d6610 DG |
104 | LTTNG_EVENT_SPLICE = 0, |
105 | LTTNG_EVENT_MMAP = 1, | |
e6ddca71 DG |
106 | }; |
107 | ||
7d29a247 DG |
108 | /* Event context possible type */ |
109 | enum lttng_event_context_type { | |
d78d6610 DG |
110 | LTTNG_EVENT_CONTEXT_PID = 0, |
111 | LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1, | |
9197c5c4 | 112 | LTTNG_EVENT_CONTEXT_PROCNAME = 2, |
d78d6610 DG |
113 | LTTNG_EVENT_CONTEXT_PRIO = 3, |
114 | LTTNG_EVENT_CONTEXT_NICE = 4, | |
115 | LTTNG_EVENT_CONTEXT_VPID = 5, | |
116 | LTTNG_EVENT_CONTEXT_TID = 6, | |
117 | LTTNG_EVENT_CONTEXT_VTID = 7, | |
118 | LTTNG_EVENT_CONTEXT_PPID = 8, | |
119 | LTTNG_EVENT_CONTEXT_VPPID = 9, | |
9197c5c4 | 120 | LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10, |
d65106b1 DG |
121 | }; |
122 | ||
d0254c7c | 123 | enum lttng_calibrate_type { |
d78d6610 | 124 | LTTNG_CALIBRATE_FUNCTION = 0, |
d0254c7c MD |
125 | }; |
126 | ||
ece640c8 RB |
127 | /* |
128 | * The structures should be initialized to zero before use. | |
129 | */ | |
8d326ab9 DG |
130 | #define LTTNG_DOMAIN_PADDING1 16 |
131 | #define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
9f19cc17 DG |
132 | struct lttng_domain { |
133 | enum lttng_domain_type type; | |
8d326ab9 DG |
134 | char padding[LTTNG_DOMAIN_PADDING1]; |
135 | ||
9f19cc17 DG |
136 | union { |
137 | pid_t pid; | |
138 | char exec_name[NAME_MAX]; | |
8d326ab9 | 139 | char padding[LTTNG_DOMAIN_PADDING2]; |
9f19cc17 DG |
140 | } attr; |
141 | }; | |
142 | ||
ece640c8 RB |
143 | /* |
144 | * Perf counter attributes | |
145 | * | |
146 | * The structures should be initialized to zero before use. | |
147 | */ | |
8d326ab9 | 148 | #define LTTNG_PERF_EVENT_PADDING1 16 |
7d29a247 | 149 | struct lttng_event_perf_counter_ctx { |
d65106b1 DG |
150 | uint32_t type; |
151 | uint64_t config; | |
152 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
153 | |
154 | char padding[LTTNG_PERF_EVENT_PADDING1]; | |
d65106b1 DG |
155 | }; |
156 | ||
ece640c8 RB |
157 | /* |
158 | * Event/channel context | |
159 | * | |
160 | * The structures should be initialized to zero before use. | |
161 | */ | |
8d326ab9 DG |
162 | #define LTTNG_EVENT_CONTEXT_PADDING1 16 |
163 | #define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
7d29a247 DG |
164 | struct lttng_event_context { |
165 | enum lttng_event_context_type ctx; | |
8d326ab9 DG |
166 | char padding[LTTNG_EVENT_CONTEXT_PADDING1]; |
167 | ||
d65106b1 | 168 | union { |
7d29a247 | 169 | struct lttng_event_perf_counter_ctx perf_counter; |
8d326ab9 | 170 | char padding[LTTNG_EVENT_CONTEXT_PADDING2]; |
d65106b1 DG |
171 | } u; |
172 | }; | |
173 | ||
b7384347 | 174 | /* |
7d29a247 DG |
175 | * Event probe. |
176 | * | |
177 | * Either addr is used or symbol_name and offset. | |
ece640c8 RB |
178 | * |
179 | * The structures should be initialized to zero before use. | |
57167058 | 180 | */ |
8d326ab9 | 181 | #define LTTNG_EVENT_PROBE_PADDING1 16 |
7d29a247 | 182 | struct lttng_event_probe_attr { |
f3ed775e DG |
183 | uint64_t addr; |
184 | ||
185 | uint64_t offset; | |
186 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
187 | |
188 | char padding[LTTNG_EVENT_PROBE_PADDING1]; | |
57167058 DG |
189 | }; |
190 | ||
b7384347 | 191 | /* |
f3ed775e | 192 | * Function tracer |
ece640c8 RB |
193 | * |
194 | * The structures should be initialized to zero before use. | |
f3ed775e | 195 | */ |
8d326ab9 | 196 | #define LTTNG_EVENT_FUNCTION_PADDING1 16 |
f3ed775e DG |
197 | struct lttng_event_function_attr { |
198 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
199 | |
200 | char padding[LTTNG_EVENT_FUNCTION_PADDING1]; | |
f3ed775e DG |
201 | }; |
202 | ||
203 | /* | |
204 | * Generic lttng event | |
ece640c8 RB |
205 | * |
206 | * The structures should be initialized to zero before use. | |
f3ed775e | 207 | */ |
8d326ab9 DG |
208 | #define LTTNG_EVENT_PADDING1 16 |
209 | #define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
f3ed775e | 210 | struct lttng_event { |
0cda4f28 | 211 | enum lttng_event_type type; |
f3ed775e | 212 | char name[LTTNG_SYMBOL_NAME_LEN]; |
0cda4f28 MD |
213 | |
214 | enum lttng_loglevel_type loglevel_type; | |
8005f29a | 215 | int loglevel; |
0cda4f28 | 216 | |
35dc4d62 | 217 | int32_t enabled; /* Does not apply: -1 */ |
b551a063 | 218 | pid_t pid; |
8d326ab9 DG |
219 | |
220 | char padding[LTTNG_EVENT_PADDING1]; | |
221 | ||
f3ed775e DG |
222 | /* Per event type configuration */ |
223 | union { | |
7d29a247 | 224 | struct lttng_event_probe_attr probe; |
f3ed775e | 225 | struct lttng_event_function_attr ftrace; |
8d326ab9 DG |
226 | |
227 | char padding[LTTNG_EVENT_PADDING2]; | |
f3ed775e DG |
228 | } attr; |
229 | }; | |
230 | ||
f37d259d MD |
231 | enum lttng_event_field_type { |
232 | LTTNG_EVENT_FIELD_OTHER = 0, | |
233 | LTTNG_EVENT_FIELD_INTEGER = 1, | |
234 | LTTNG_EVENT_FIELD_ENUM = 2, | |
235 | LTTNG_EVENT_FIELD_FLOAT = 3, | |
236 | LTTNG_EVENT_FIELD_STRING = 4, | |
237 | }; | |
238 | ||
239 | #define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32 | |
240 | struct lttng_event_field { | |
241 | char field_name[LTTNG_SYMBOL_NAME_LEN]; | |
242 | enum lttng_event_field_type type; | |
243 | char padding[LTTNG_EVENT_FIELD_PADDING]; | |
244 | struct lttng_event event; | |
245 | }; | |
246 | ||
e6ddca71 DG |
247 | /* |
248 | * Tracer channel attributes. For both kernel and user-space. | |
ece640c8 RB |
249 | * |
250 | * The structures should be initialized to zero before use. | |
e6ddca71 | 251 | */ |
8d326ab9 | 252 | #define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32 |
f3ed775e | 253 | struct lttng_channel_attr { |
8ce37aa5 DG |
254 | int overwrite; /* 1: overwrite, 0: discard */ |
255 | uint64_t subbuf_size; /* bytes */ | |
256 | uint64_t num_subbuf; /* power of 2 */ | |
257 | unsigned int switch_timer_interval; /* usec */ | |
258 | unsigned int read_timer_interval; /* usec */ | |
f05b5f07 | 259 | enum lttng_event_output output; /* splice, mmap */ |
8d326ab9 DG |
260 | |
261 | char padding[LTTNG_CHANNEL_ATTR_PADDING1]; | |
f3ed775e DG |
262 | }; |
263 | ||
264 | /* | |
e6ddca71 | 265 | * Channel information structure. For both kernel and user-space. |
ece640c8 RB |
266 | * |
267 | * The structures should be initialized to zero before use. | |
1657e9bb | 268 | */ |
8d326ab9 | 269 | #define LTTNG_CHANNEL_PADDING1 16 |
e6ddca71 | 270 | struct lttng_channel { |
045e5491 | 271 | char name[LTTNG_SYMBOL_NAME_LEN]; |
9f19cc17 | 272 | uint32_t enabled; |
e6ddca71 | 273 | struct lttng_channel_attr attr; |
8d326ab9 DG |
274 | |
275 | char padding[LTTNG_CHANNEL_PADDING1]; | |
f3ed775e DG |
276 | }; |
277 | ||
8d326ab9 | 278 | #define LTTNG_CALIBRATE_PADDING1 16 |
d0254c7c MD |
279 | struct lttng_calibrate { |
280 | enum lttng_calibrate_type type; | |
8d326ab9 DG |
281 | |
282 | char padding[LTTNG_CALIBRATE_PADDING1]; | |
d0254c7c MD |
283 | }; |
284 | ||
e6ddca71 DG |
285 | /* |
286 | * Basic session information. | |
287 | * | |
288 | * This is an 'output data' meaning that it only comes *from* the session | |
289 | * daemon *to* the lttng client. It's basically a 'human' representation of | |
290 | * tracing entities (here a session). | |
ece640c8 RB |
291 | * |
292 | * The structures should be initialized to zero before use. | |
e6ddca71 | 293 | */ |
8d326ab9 | 294 | #define LTTNG_SESSION_PADDING1 16 |
e6ddca71 | 295 | struct lttng_session { |
f3ed775e | 296 | char name[NAME_MAX]; |
e6ddca71 DG |
297 | /* The path where traces are written */ |
298 | char path[PATH_MAX]; | |
464dd62d | 299 | uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */ |
8d326ab9 DG |
300 | |
301 | char padding[LTTNG_SESSION_PADDING1]; | |
1657e9bb DG |
302 | }; |
303 | ||
cd80958d DG |
304 | /* |
305 | * Handle used as a context for commands. | |
ece640c8 RB |
306 | * |
307 | * The structures should be initialized to zero before use. | |
cd80958d | 308 | */ |
8d326ab9 | 309 | #define LTTNG_HANDLE_PADDING1 16 |
cd80958d DG |
310 | struct lttng_handle { |
311 | char session_name[NAME_MAX]; | |
312 | struct lttng_domain domain; | |
8d326ab9 DG |
313 | |
314 | char padding[LTTNG_HANDLE_PADDING1]; | |
cd80958d DG |
315 | }; |
316 | ||
7d29a247 DG |
317 | /* |
318 | * Public LTTng control API | |
319 | * | |
1e46a50f | 320 | * For functions having an lttng domain type as parameter, if a bad value is |
7d29a247 DG |
321 | * given, NO default is applied and an error is returned. |
322 | * | |
323 | * On success, all functions of the API return 0 or the size of the allocated | |
1e46a50f | 324 | * array (in bytes). |
7d29a247 DG |
325 | * |
326 | * On error, a negative value is returned being a specific lttng-tools error | |
9a745bc7 | 327 | * code which can be humanly interpreted with lttng_strerror(err). |
1e46a50f TD |
328 | * |
329 | * Exceptions to this are noted below. | |
7d29a247 DG |
330 | */ |
331 | ||
b7384347 | 332 | /* |
1e46a50f | 333 | * Create a handle used as a context for every request made to the library. |
cd80958d DG |
334 | * |
335 | * This handle contains the session name and lttng domain on which the command | |
1e46a50f TD |
336 | * will be executed. |
337 | * The returned pointer will be NULL in case of malloc() error. | |
cd80958d DG |
338 | */ |
339 | extern struct lttng_handle *lttng_create_handle(const char *session_name, | |
340 | struct lttng_domain *domain); | |
341 | ||
342 | /* | |
1e46a50f TD |
343 | * Destroy a handle. This will simply free(3) the data pointer returned by |
344 | * lttng_create_handle(), rendering it unusable. | |
b7384347 | 345 | */ |
cd80958d | 346 | extern void lttng_destroy_handle(struct lttng_handle *handle); |
7d29a247 DG |
347 | |
348 | /* | |
1e46a50f TD |
349 | * Create a tracing session using a name and a path where the trace will be |
350 | * written. | |
7d29a247 | 351 | */ |
38057ed1 | 352 | extern int lttng_create_session(const char *name, const char *path); |
f3ed775e | 353 | |
7d29a247 | 354 | /* |
1e46a50f | 355 | * Destroy a tracing session. |
7d29a247 | 356 | * |
1e46a50f TD |
357 | * The session will not be usable anymore, tracing will be stopped for all |
358 | * registered traces, and the tracing buffers will be flushed. | |
7d29a247 | 359 | */ |
843f5df9 | 360 | extern int lttng_destroy_session(const char *name); |
f3ed775e | 361 | |
e6ddca71 | 362 | /* |
1e46a50f | 363 | * List all the tracing sessions. |
7d29a247 | 364 | * |
1e46a50f TD |
365 | * Return the size (number of entries) of the "lttng_session" array. Caller |
366 | * must free(3). | |
e6ddca71 | 367 | */ |
ca95a216 | 368 | extern int lttng_list_sessions(struct lttng_session **sessions); |
f3ed775e | 369 | |
9f19cc17 | 370 | /* |
1e46a50f | 371 | * List the registered domain(s) of a session. |
9f19cc17 | 372 | * |
1e46a50f TD |
373 | * Return the size (number of entries) of the "lttng_domain" array. Caller |
374 | * must free(3). | |
9f19cc17 | 375 | */ |
330be774 | 376 | extern int lttng_list_domains(const char *session_name, |
9f19cc17 DG |
377 | struct lttng_domain **domains); |
378 | ||
379 | /* | |
1e46a50f | 380 | * List the channel(s) of a session. |
9f19cc17 | 381 | * |
1e46a50f TD |
382 | * Return the size (number of entries) of the "lttng_channel" array. Caller |
383 | * must free(3). | |
9f19cc17 | 384 | */ |
cd80958d DG |
385 | extern int lttng_list_channels(struct lttng_handle *handle, |
386 | struct lttng_channel **channels); | |
9f19cc17 DG |
387 | |
388 | /* | |
1e46a50f | 389 | * List the event(s) of a session channel. |
9f19cc17 | 390 | * |
1e46a50f TD |
391 | * Return the size (number of entries) of the "lttng_event" array. |
392 | * Caller must free(3). | |
9f19cc17 | 393 | */ |
cd80958d DG |
394 | extern int lttng_list_events(struct lttng_handle *handle, |
395 | const char *channel_name, struct lttng_event **events); | |
9f19cc17 DG |
396 | |
397 | /* | |
1e46a50f | 398 | * List the available tracepoints of a specific lttng domain. |
9f19cc17 | 399 | * |
1e46a50f TD |
400 | * Return the size (number of entries) of the "lttng_event" array. |
401 | * Caller must free(3). | |
9f19cc17 | 402 | */ |
cd80958d | 403 | extern int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 404 | struct lttng_event **events); |
9f19cc17 | 405 | |
f37d259d MD |
406 | /* |
407 | * List the available tracepoints fields of a specific lttng domain. | |
408 | * | |
409 | * Return the size (number of entries) of the "lttng_event_field" array. | |
410 | * Caller must free(3). | |
411 | */ | |
412 | extern int lttng_list_tracepoint_fields(struct lttng_handle *handle, | |
413 | struct lttng_event_field **fields); | |
414 | ||
7d29a247 DG |
415 | /* |
416 | * Check if a session daemon is alive. | |
1e46a50f TD |
417 | * |
418 | * Return 1 if alive or 0 if not. On error returns a negative value. | |
7d29a247 | 419 | */ |
947308c4 | 420 | extern int lttng_session_daemon_alive(void); |
f3ed775e | 421 | |
7d29a247 | 422 | /* |
1e46a50f TD |
423 | * Set the tracing group for the *current* flow of execution. |
424 | * | |
425 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
7d29a247 | 426 | */ |
b7384347 | 427 | extern int lttng_set_tracing_group(const char *name); |
f3ed775e | 428 | |
7d29a247 | 429 | /* |
1e46a50f | 430 | * Return a human-readable error message for an lttng-tools error code. |
7d29a247 DG |
431 | * |
432 | * Parameter MUST be a negative value or else you'll get a generic message. | |
433 | */ | |
9a745bc7 | 434 | extern const char *lttng_strerror(int code); |
b7384347 | 435 | |
d9800920 | 436 | /* |
1e46a50f TD |
437 | * This call registers an "outside consumer" for a session and an lttng domain. |
438 | * No consumer will be spawned and all fds/commands will go through the socket | |
439 | * path given (socket_path). | |
d9800920 | 440 | * |
3bd1e081 | 441 | * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the |
d9800920 DG |
442 | * command socket. The error socket is not supported yet for roaming consumers. |
443 | */ | |
444 | extern int lttng_register_consumer(struct lttng_handle *handle, | |
445 | const char *socket_path); | |
446 | ||
7d29a247 | 447 | /* |
1e46a50f | 448 | * Start tracing for *all* registered traces (kernel and user-space). |
7d29a247 | 449 | */ |
6a4f824d | 450 | extern int lttng_start_tracing(const char *session_name); |
f3ed775e | 451 | |
7d29a247 | 452 | /* |
1e46a50f | 453 | * Stop tracing for *all* registered traces (kernel and user-space). |
7d29a247 | 454 | */ |
6a4f824d | 455 | extern int lttng_stop_tracing(const char *session_name); |
f3ed775e | 456 | |
b7384347 | 457 | /* |
1e46a50f | 458 | * Add context to event(s) for a specific channel (or for all). |
7d29a247 | 459 | * |
1e46a50f | 460 | * If event_name is NULL, the context is applied to all events of the channel. |
7d29a247 | 461 | * If channel_name is NULL, a lookup of the event's channel is done. |
1e46a50f | 462 | * If both are NULL, the context is applied to all events of all channels. |
b7384347 | 463 | */ |
cd80958d | 464 | extern int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
465 | struct lttng_event_context *ctx, const char *event_name, |
466 | const char *channel_name); | |
f3ed775e | 467 | |
7d29a247 | 468 | /* |
c8f61fc6 | 469 | * Create or enable an event (or events) for a channel. |
7d29a247 DG |
470 | * |
471 | * If the event you are trying to enable does not exist, it will be created, | |
472 | * else it is enabled. | |
1e46a50f | 473 | * If event_name is NULL, all events are enabled. |
7d29a247 DG |
474 | * If channel_name is NULL, the default channel is used (channel0). |
475 | */ | |
cd80958d DG |
476 | extern int lttng_enable_event(struct lttng_handle *handle, |
477 | struct lttng_event *ev, const char *channel_name); | |
f3ed775e | 478 | |
7d29a247 | 479 | /* |
c8f61fc6 | 480 | * Create or enable a channel. |
1e46a50f | 481 | * The channel name cannot be NULL. |
7d29a247 | 482 | */ |
cd80958d | 483 | extern int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 484 | struct lttng_channel *chan); |
f3ed775e | 485 | |
7d29a247 | 486 | /* |
c8f61fc6 | 487 | * Disable event(s) of a channel and domain. |
7d29a247 | 488 | * |
1e46a50f | 489 | * If event_name is NULL, all events are disabled. |
7d29a247 DG |
490 | * If channel_name is NULL, the default channel is used (channel0). |
491 | */ | |
cd80958d DG |
492 | extern int lttng_disable_event(struct lttng_handle *handle, |
493 | const char *name, const char *channel_name); | |
fac6795d | 494 | |
1df4dedd | 495 | /* |
c8f61fc6 | 496 | * Disable channel. |
7d29a247 | 497 | * |
1e46a50f | 498 | * The channel name cannot be NULL. |
1df4dedd | 499 | */ |
cd80958d | 500 | extern int lttng_disable_channel(struct lttng_handle *handle, |
38057ed1 | 501 | const char *name); |
1df4dedd | 502 | |
d0254c7c MD |
503 | /* |
504 | * Calibrate LTTng overhead. | |
505 | */ | |
cd80958d | 506 | extern int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
507 | struct lttng_calibrate *calibrate); |
508 | ||
5edd7e09 DG |
509 | /* |
510 | * Set the default channel attributes for a specific domain and an allocated | |
511 | * lttng_channel_attr pointer. | |
1e46a50f TD |
512 | * |
513 | * If either or both of the arguments are NULL, nothing happens. | |
5edd7e09 DG |
514 | */ |
515 | extern void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
516 | struct lttng_channel_attr *attr); | |
517 | ||
b7384347 | 518 | #endif /* _LTTNG_H */ |