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 TD |
8 | * This library is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU Lesser General Public License as published by the | |
10 | * Free Software Foundation; only version 2.1 of the License. | |
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 | ||
8d326ab9 DG |
127 | #define LTTNG_DOMAIN_PADDING1 16 |
128 | #define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
9f19cc17 DG |
129 | struct lttng_domain { |
130 | enum lttng_domain_type type; | |
8d326ab9 DG |
131 | char padding[LTTNG_DOMAIN_PADDING1]; |
132 | ||
9f19cc17 DG |
133 | union { |
134 | pid_t pid; | |
135 | char exec_name[NAME_MAX]; | |
8d326ab9 | 136 | char padding[LTTNG_DOMAIN_PADDING2]; |
9f19cc17 DG |
137 | } attr; |
138 | }; | |
139 | ||
d65106b1 | 140 | /* Perf counter attributes */ |
8d326ab9 | 141 | #define LTTNG_PERF_EVENT_PADDING1 16 |
7d29a247 | 142 | struct lttng_event_perf_counter_ctx { |
d65106b1 DG |
143 | uint32_t type; |
144 | uint64_t config; | |
145 | char name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
146 | |
147 | char padding[LTTNG_PERF_EVENT_PADDING1]; | |
d65106b1 DG |
148 | }; |
149 | ||
150 | /* Event/Channel context */ | |
8d326ab9 DG |
151 | #define LTTNG_EVENT_CONTEXT_PADDING1 16 |
152 | #define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
7d29a247 DG |
153 | struct lttng_event_context { |
154 | enum lttng_event_context_type ctx; | |
8d326ab9 DG |
155 | char padding[LTTNG_EVENT_CONTEXT_PADDING1]; |
156 | ||
d65106b1 | 157 | union { |
7d29a247 | 158 | struct lttng_event_perf_counter_ctx perf_counter; |
8d326ab9 | 159 | char padding[LTTNG_EVENT_CONTEXT_PADDING2]; |
d65106b1 DG |
160 | } u; |
161 | }; | |
162 | ||
b7384347 | 163 | /* |
7d29a247 DG |
164 | * Event probe. |
165 | * | |
166 | * Either addr is used or symbol_name and offset. | |
57167058 | 167 | */ |
8d326ab9 | 168 | #define LTTNG_EVENT_PROBE_PADDING1 16 |
7d29a247 | 169 | struct lttng_event_probe_attr { |
f3ed775e DG |
170 | uint64_t addr; |
171 | ||
172 | uint64_t offset; | |
173 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
174 | |
175 | char padding[LTTNG_EVENT_PROBE_PADDING1]; | |
57167058 DG |
176 | }; |
177 | ||
b7384347 | 178 | /* |
f3ed775e DG |
179 | * Function tracer |
180 | */ | |
8d326ab9 | 181 | #define LTTNG_EVENT_FUNCTION_PADDING1 16 |
f3ed775e DG |
182 | struct lttng_event_function_attr { |
183 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; | |
8d326ab9 DG |
184 | |
185 | char padding[LTTNG_EVENT_FUNCTION_PADDING1]; | |
f3ed775e DG |
186 | }; |
187 | ||
188 | /* | |
189 | * Generic lttng event | |
190 | */ | |
8d326ab9 DG |
191 | #define LTTNG_EVENT_PADDING1 16 |
192 | #define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 | |
f3ed775e | 193 | struct lttng_event { |
0cda4f28 | 194 | enum lttng_event_type type; |
f3ed775e | 195 | char name[LTTNG_SYMBOL_NAME_LEN]; |
0cda4f28 MD |
196 | |
197 | enum lttng_loglevel_type loglevel_type; | |
8005f29a | 198 | int loglevel; |
0cda4f28 | 199 | |
9f19cc17 | 200 | uint32_t enabled; |
b551a063 | 201 | pid_t pid; |
8d326ab9 DG |
202 | |
203 | char padding[LTTNG_EVENT_PADDING1]; | |
204 | ||
f3ed775e DG |
205 | /* Per event type configuration */ |
206 | union { | |
7d29a247 | 207 | struct lttng_event_probe_attr probe; |
f3ed775e | 208 | struct lttng_event_function_attr ftrace; |
8d326ab9 DG |
209 | |
210 | char padding[LTTNG_EVENT_PADDING2]; | |
f3ed775e DG |
211 | } attr; |
212 | }; | |
213 | ||
e6ddca71 DG |
214 | /* |
215 | * Tracer channel attributes. For both kernel and user-space. | |
216 | */ | |
8d326ab9 | 217 | #define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32 |
f3ed775e | 218 | struct lttng_channel_attr { |
8ce37aa5 DG |
219 | int overwrite; /* 1: overwrite, 0: discard */ |
220 | uint64_t subbuf_size; /* bytes */ | |
221 | uint64_t num_subbuf; /* power of 2 */ | |
222 | unsigned int switch_timer_interval; /* usec */ | |
223 | unsigned int read_timer_interval; /* usec */ | |
f05b5f07 | 224 | enum lttng_event_output output; /* splice, mmap */ |
8d326ab9 DG |
225 | |
226 | char padding[LTTNG_CHANNEL_ATTR_PADDING1]; | |
f3ed775e DG |
227 | }; |
228 | ||
229 | /* | |
e6ddca71 | 230 | * Channel information structure. For both kernel and user-space. |
1657e9bb | 231 | */ |
8d326ab9 | 232 | #define LTTNG_CHANNEL_PADDING1 16 |
e6ddca71 | 233 | struct lttng_channel { |
045e5491 | 234 | char name[LTTNG_SYMBOL_NAME_LEN]; |
9f19cc17 | 235 | uint32_t enabled; |
e6ddca71 | 236 | struct lttng_channel_attr attr; |
8d326ab9 DG |
237 | |
238 | char padding[LTTNG_CHANNEL_PADDING1]; | |
f3ed775e DG |
239 | }; |
240 | ||
8d326ab9 | 241 | #define LTTNG_CALIBRATE_PADDING1 16 |
d0254c7c MD |
242 | struct lttng_calibrate { |
243 | enum lttng_calibrate_type type; | |
8d326ab9 DG |
244 | |
245 | char padding[LTTNG_CALIBRATE_PADDING1]; | |
d0254c7c MD |
246 | }; |
247 | ||
e6ddca71 DG |
248 | /* |
249 | * Basic session information. | |
250 | * | |
251 | * This is an 'output data' meaning that it only comes *from* the session | |
252 | * daemon *to* the lttng client. It's basically a 'human' representation of | |
253 | * tracing entities (here a session). | |
254 | */ | |
8d326ab9 | 255 | #define LTTNG_SESSION_PADDING1 16 |
e6ddca71 | 256 | struct lttng_session { |
f3ed775e | 257 | char name[NAME_MAX]; |
e6ddca71 DG |
258 | /* The path where traces are written */ |
259 | char path[PATH_MAX]; | |
464dd62d | 260 | uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */ |
8d326ab9 DG |
261 | |
262 | char padding[LTTNG_SESSION_PADDING1]; | |
1657e9bb DG |
263 | }; |
264 | ||
cd80958d DG |
265 | /* |
266 | * Handle used as a context for commands. | |
267 | */ | |
8d326ab9 | 268 | #define LTTNG_HANDLE_PADDING1 16 |
cd80958d DG |
269 | struct lttng_handle { |
270 | char session_name[NAME_MAX]; | |
271 | struct lttng_domain domain; | |
8d326ab9 DG |
272 | |
273 | char padding[LTTNG_HANDLE_PADDING1]; | |
cd80958d DG |
274 | }; |
275 | ||
7d29a247 DG |
276 | /* |
277 | * Public LTTng control API | |
278 | * | |
1e46a50f | 279 | * For functions having an lttng domain type as parameter, if a bad value is |
7d29a247 DG |
280 | * given, NO default is applied and an error is returned. |
281 | * | |
282 | * On success, all functions of the API return 0 or the size of the allocated | |
1e46a50f | 283 | * array (in bytes). |
7d29a247 DG |
284 | * |
285 | * On error, a negative value is returned being a specific lttng-tools error | |
9a745bc7 | 286 | * code which can be humanly interpreted with lttng_strerror(err). |
1e46a50f TD |
287 | * |
288 | * Exceptions to this are noted below. | |
7d29a247 DG |
289 | */ |
290 | ||
b7384347 | 291 | /* |
1e46a50f | 292 | * Create a handle used as a context for every request made to the library. |
cd80958d DG |
293 | * |
294 | * This handle contains the session name and lttng domain on which the command | |
1e46a50f TD |
295 | * will be executed. |
296 | * The returned pointer will be NULL in case of malloc() error. | |
cd80958d DG |
297 | */ |
298 | extern struct lttng_handle *lttng_create_handle(const char *session_name, | |
299 | struct lttng_domain *domain); | |
300 | ||
301 | /* | |
1e46a50f TD |
302 | * Destroy a handle. This will simply free(3) the data pointer returned by |
303 | * lttng_create_handle(), rendering it unusable. | |
b7384347 | 304 | */ |
cd80958d | 305 | extern void lttng_destroy_handle(struct lttng_handle *handle); |
7d29a247 DG |
306 | |
307 | /* | |
1e46a50f TD |
308 | * Create a tracing session using a name and a path where the trace will be |
309 | * written. | |
7d29a247 | 310 | */ |
38057ed1 | 311 | extern int lttng_create_session(const char *name, const char *path); |
f3ed775e | 312 | |
7d29a247 | 313 | /* |
1e46a50f | 314 | * Destroy a tracing session. |
7d29a247 | 315 | * |
1e46a50f TD |
316 | * The session will not be usable anymore, tracing will be stopped for all |
317 | * registered traces, and the tracing buffers will be flushed. | |
7d29a247 | 318 | */ |
843f5df9 | 319 | extern int lttng_destroy_session(const char *name); |
f3ed775e | 320 | |
e6ddca71 | 321 | /* |
1e46a50f | 322 | * List all the tracing sessions. |
7d29a247 | 323 | * |
1e46a50f TD |
324 | * Return the size (number of entries) of the "lttng_session" array. Caller |
325 | * must free(3). | |
e6ddca71 | 326 | */ |
ca95a216 | 327 | extern int lttng_list_sessions(struct lttng_session **sessions); |
f3ed775e | 328 | |
9f19cc17 | 329 | /* |
1e46a50f | 330 | * List the registered domain(s) of a session. |
9f19cc17 | 331 | * |
1e46a50f TD |
332 | * Return the size (number of entries) of the "lttng_domain" array. Caller |
333 | * must free(3). | |
9f19cc17 | 334 | */ |
330be774 | 335 | extern int lttng_list_domains(const char *session_name, |
9f19cc17 DG |
336 | struct lttng_domain **domains); |
337 | ||
338 | /* | |
1e46a50f | 339 | * List the channel(s) of a session. |
9f19cc17 | 340 | * |
1e46a50f TD |
341 | * Return the size (number of entries) of the "lttng_channel" array. Caller |
342 | * must free(3). | |
9f19cc17 | 343 | */ |
cd80958d DG |
344 | extern int lttng_list_channels(struct lttng_handle *handle, |
345 | struct lttng_channel **channels); | |
9f19cc17 DG |
346 | |
347 | /* | |
1e46a50f | 348 | * List the event(s) of a session channel. |
9f19cc17 | 349 | * |
1e46a50f TD |
350 | * Return the size (number of entries) of the "lttng_event" array. |
351 | * Caller must free(3). | |
9f19cc17 | 352 | */ |
cd80958d DG |
353 | extern int lttng_list_events(struct lttng_handle *handle, |
354 | const char *channel_name, struct lttng_event **events); | |
9f19cc17 DG |
355 | |
356 | /* | |
1e46a50f | 357 | * List the available tracepoints of a specific lttng domain. |
9f19cc17 | 358 | * |
1e46a50f TD |
359 | * Return the size (number of entries) of the "lttng_event" array. |
360 | * Caller must free(3). | |
9f19cc17 | 361 | */ |
cd80958d | 362 | extern int lttng_list_tracepoints(struct lttng_handle *handle, |
2a71efd5 | 363 | struct lttng_event **events); |
9f19cc17 | 364 | |
7d29a247 DG |
365 | /* |
366 | * Check if a session daemon is alive. | |
1e46a50f TD |
367 | * |
368 | * Return 1 if alive or 0 if not. On error returns a negative value. | |
7d29a247 | 369 | */ |
947308c4 | 370 | extern int lttng_session_daemon_alive(void); |
f3ed775e | 371 | |
7d29a247 | 372 | /* |
1e46a50f TD |
373 | * Set the tracing group for the *current* flow of execution. |
374 | * | |
375 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. | |
7d29a247 | 376 | */ |
b7384347 | 377 | extern int lttng_set_tracing_group(const char *name); |
f3ed775e | 378 | |
7d29a247 | 379 | /* |
1e46a50f | 380 | * Return a human-readable error message for an lttng-tools error code. |
7d29a247 DG |
381 | * |
382 | * Parameter MUST be a negative value or else you'll get a generic message. | |
383 | */ | |
9a745bc7 | 384 | extern const char *lttng_strerror(int code); |
b7384347 | 385 | |
d9800920 | 386 | /* |
1e46a50f TD |
387 | * This call registers an "outside consumer" for a session and an lttng domain. |
388 | * No consumer will be spawned and all fds/commands will go through the socket | |
389 | * path given (socket_path). | |
d9800920 | 390 | * |
3bd1e081 | 391 | * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the |
d9800920 DG |
392 | * command socket. The error socket is not supported yet for roaming consumers. |
393 | */ | |
394 | extern int lttng_register_consumer(struct lttng_handle *handle, | |
395 | const char *socket_path); | |
396 | ||
7d29a247 | 397 | /* |
1e46a50f | 398 | * Start tracing for *all* registered traces (kernel and user-space). |
7d29a247 | 399 | */ |
6a4f824d | 400 | extern int lttng_start_tracing(const char *session_name); |
f3ed775e | 401 | |
7d29a247 | 402 | /* |
1e46a50f | 403 | * Stop tracing for *all* registered traces (kernel and user-space). |
7d29a247 | 404 | */ |
6a4f824d | 405 | extern int lttng_stop_tracing(const char *session_name); |
f3ed775e | 406 | |
b7384347 | 407 | /* |
1e46a50f | 408 | * Add context to event(s) for a specific channel (or for all). |
7d29a247 | 409 | * |
1e46a50f | 410 | * If event_name is NULL, the context is applied to all events of the channel. |
7d29a247 | 411 | * If channel_name is NULL, a lookup of the event's channel is done. |
1e46a50f | 412 | * If both are NULL, the context is applied to all events of all channels. |
b7384347 | 413 | */ |
cd80958d | 414 | extern int lttng_add_context(struct lttng_handle *handle, |
38057ed1 DG |
415 | struct lttng_event_context *ctx, const char *event_name, |
416 | const char *channel_name); | |
f3ed775e | 417 | |
7d29a247 | 418 | /* |
1e46a50f | 419 | * Create or enable a kernel event (or events) for a channel. |
7d29a247 DG |
420 | * |
421 | * If the event you are trying to enable does not exist, it will be created, | |
422 | * else it is enabled. | |
1e46a50f | 423 | * If event_name is NULL, all events are enabled. |
7d29a247 DG |
424 | * If channel_name is NULL, the default channel is used (channel0). |
425 | */ | |
cd80958d DG |
426 | extern int lttng_enable_event(struct lttng_handle *handle, |
427 | struct lttng_event *ev, const char *channel_name); | |
f3ed775e | 428 | |
7d29a247 DG |
429 | /* |
430 | * Create or enable a kernel channel. | |
1e46a50f | 431 | * The channel name cannot be NULL. |
7d29a247 | 432 | */ |
cd80958d | 433 | extern int lttng_enable_channel(struct lttng_handle *handle, |
38057ed1 | 434 | struct lttng_channel *chan); |
f3ed775e | 435 | |
7d29a247 | 436 | /* |
1e46a50f | 437 | * Disable kernel event(s) of a channel and domain. |
7d29a247 | 438 | * |
1e46a50f | 439 | * If event_name is NULL, all events are disabled. |
7d29a247 DG |
440 | * If channel_name is NULL, the default channel is used (channel0). |
441 | */ | |
cd80958d DG |
442 | extern int lttng_disable_event(struct lttng_handle *handle, |
443 | const char *name, const char *channel_name); | |
fac6795d | 444 | |
1df4dedd | 445 | /* |
7d29a247 DG |
446 | * Disable kernel channel. |
447 | * | |
1e46a50f | 448 | * The channel name cannot be NULL. |
1df4dedd | 449 | */ |
cd80958d | 450 | extern int lttng_disable_channel(struct lttng_handle *handle, |
38057ed1 | 451 | const char *name); |
1df4dedd | 452 | |
d0254c7c MD |
453 | /* |
454 | * Calibrate LTTng overhead. | |
455 | */ | |
cd80958d | 456 | extern int lttng_calibrate(struct lttng_handle *handle, |
d0254c7c MD |
457 | struct lttng_calibrate *calibrate); |
458 | ||
5edd7e09 DG |
459 | /* |
460 | * Set the default channel attributes for a specific domain and an allocated | |
461 | * lttng_channel_attr pointer. | |
1e46a50f TD |
462 | * |
463 | * If either or both of the arguments are NULL, nothing happens. | |
5edd7e09 DG |
464 | */ |
465 | extern void lttng_channel_set_default_attr(struct lttng_domain *domain, | |
466 | struct lttng_channel_attr *attr); | |
467 | ||
b7384347 | 468 | #endif /* _LTTNG_H */ |