[lttng-tools.git] / include / lttng / event.h

/*
 * Copyright (C) 2014 - David Goulet <dgoulet@efficios.com>
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License, version 2.1 only,
 * as published by the Free Software Foundation.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef LTTNG_EVENT_H
#define LTTNG_EVENT_H

#ifdef __cplusplus
extern "C" {
#endif

#include <lttng/handle.h>

/*
 * Instrumentation type of tracing event.
 */
enum lttng_event_type {
	LTTNG_EVENT_ALL                       = -1,
	LTTNG_EVENT_TRACEPOINT                = 0,
	LTTNG_EVENT_PROBE                     = 1,
	LTTNG_EVENT_FUNCTION                  = 2,
	LTTNG_EVENT_FUNCTION_ENTRY            = 3,
	LTTNG_EVENT_NOOP                      = 4,
	LTTNG_EVENT_SYSCALL                   = 5,
};

/*
 * Loglevel information.
 */
enum lttng_loglevel_type {
	LTTNG_EVENT_LOGLEVEL_ALL              = 0,
	LTTNG_EVENT_LOGLEVEL_RANGE            = 1,
	LTTNG_EVENT_LOGLEVEL_SINGLE           = 2,
};

/*
 * Available loglevels.
 */
enum lttng_loglevel {
	LTTNG_LOGLEVEL_EMERG                  = 0,
	LTTNG_LOGLEVEL_ALERT                  = 1,
	LTTNG_LOGLEVEL_CRIT                   = 2,
	LTTNG_LOGLEVEL_ERR                    = 3,
	LTTNG_LOGLEVEL_WARNING                = 4,
	LTTNG_LOGLEVEL_NOTICE                 = 5,
	LTTNG_LOGLEVEL_INFO                   = 6,
	LTTNG_LOGLEVEL_DEBUG_SYSTEM           = 7,
	LTTNG_LOGLEVEL_DEBUG_PROGRAM          = 8,
	LTTNG_LOGLEVEL_DEBUG_PROCESS          = 9,
	LTTNG_LOGLEVEL_DEBUG_MODULE           = 10,
	LTTNG_LOGLEVEL_DEBUG_UNIT             = 11,
	LTTNG_LOGLEVEL_DEBUG_FUNCTION         = 12,
	LTTNG_LOGLEVEL_DEBUG_LINE             = 13,
	LTTNG_LOGLEVEL_DEBUG                  = 14,
};

/*
 * Available loglevels for the JUL domain. Those are an exact map from the
 * class java.util.logging.Level.
 */
enum lttng_loglevel_jul {
	LTTNG_LOGLEVEL_JUL_OFF                = INT32_MAX,
	LTTNG_LOGLEVEL_JUL_SEVERE             = 1000,
	LTTNG_LOGLEVEL_JUL_WARNING            = 900,
	LTTNG_LOGLEVEL_JUL_INFO               = 800,
	LTTNG_LOGLEVEL_JUL_CONFIG             = 700,
	LTTNG_LOGLEVEL_JUL_FINE               = 500,
	LTTNG_LOGLEVEL_JUL_FINER              = 400,
	LTTNG_LOGLEVEL_JUL_FINEST             = 300,
	LTTNG_LOGLEVEL_JUL_ALL                = INT32_MIN,
};

/*
 * LTTng consumer mode
 */
enum lttng_event_output {
	LTTNG_EVENT_SPLICE                    = 0,
	LTTNG_EVENT_MMAP                      = 1,
};

/* Event context possible type */
enum lttng_event_context_type {
	LTTNG_EVENT_CONTEXT_PID               = 0,
	LTTNG_EVENT_CONTEXT_PERF_COUNTER      = 1,	/* Backward compat. */
	LTTNG_EVENT_CONTEXT_PROCNAME          = 2,
	LTTNG_EVENT_CONTEXT_PRIO              = 3,
	LTTNG_EVENT_CONTEXT_NICE              = 4,
	LTTNG_EVENT_CONTEXT_VPID              = 5,
	LTTNG_EVENT_CONTEXT_TID               = 6,
	LTTNG_EVENT_CONTEXT_VTID              = 7,
	LTTNG_EVENT_CONTEXT_PPID              = 8,
	LTTNG_EVENT_CONTEXT_VPPID             = 9,
	LTTNG_EVENT_CONTEXT_PTHREAD_ID        = 10,
	LTTNG_EVENT_CONTEXT_HOSTNAME          = 11,
	LTTNG_EVENT_CONTEXT_IP                = 12,
	LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER  = 13,
	LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER = 14,
};

enum lttng_event_field_type {
	LTTNG_EVENT_FIELD_OTHER               = 0,
	LTTNG_EVENT_FIELD_INTEGER             = 1,
	LTTNG_EVENT_FIELD_ENUM                = 2,
	LTTNG_EVENT_FIELD_FLOAT               = 3,
	LTTNG_EVENT_FIELD_STRING              = 4,
};

/*
 * Perf counter attributes
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_PERF_EVENT_PADDING1          16
struct lttng_event_perf_counter_ctx {
	uint32_t type;
	uint64_t config;
	char name[LTTNG_SYMBOL_NAME_LEN];

	char padding[LTTNG_PERF_EVENT_PADDING1];
};

/*
 * Event/channel context
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_EVENT_CONTEXT_PADDING1       16
#define LTTNG_EVENT_CONTEXT_PADDING2       LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event_context {
	enum lttng_event_context_type ctx;
	char padding[LTTNG_EVENT_CONTEXT_PADDING1];

	union {
		struct lttng_event_perf_counter_ctx perf_counter;
		char padding[LTTNG_EVENT_CONTEXT_PADDING2];
	} u;
};

/*
 * Event probe.
 *
 * Either addr is used or symbol_name and offset.
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_EVENT_PROBE_PADDING1         16
struct lttng_event_probe_attr {
	uint64_t addr;

	uint64_t offset;
	char symbol_name[LTTNG_SYMBOL_NAME_LEN];

	char padding[LTTNG_EVENT_PROBE_PADDING1];
};

/*
 * Function tracer
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_EVENT_FUNCTION_PADDING1      16
struct lttng_event_function_attr {
	char symbol_name[LTTNG_SYMBOL_NAME_LEN];

	char padding[LTTNG_EVENT_FUNCTION_PADDING1];
};

/*
 * Generic lttng event
 *
 * The structures should be initialized to zero before use.
 */
#define LTTNG_EVENT_PADDING1               14
#define LTTNG_EVENT_PADDING2               LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event {
	enum lttng_event_type type;
	char name[LTTNG_SYMBOL_NAME_LEN];

	enum lttng_loglevel_type loglevel_type;
	int loglevel;

	int32_t enabled;	/* Does not apply: -1 */
	pid_t pid;
	unsigned char filter;	/* filter enabled ? */
	unsigned char exclusion; /* exclusions added ? */

	char padding[LTTNG_EVENT_PADDING1];

	/* Per event type configuration */
	union {
		struct lttng_event_probe_attr probe;
		struct lttng_event_function_attr ftrace;

		char padding[LTTNG_EVENT_PADDING2];
	} attr;
};

#define LTTNG_EVENT_FIELD_PADDING	LTTNG_SYMBOL_NAME_LEN + 32
struct lttng_event_field {
	char field_name[LTTNG_SYMBOL_NAME_LEN];
	enum lttng_event_field_type type;
	char padding[LTTNG_EVENT_FIELD_PADDING];
	struct lttng_event event;
	int nowrite;
};

/*
 * List the event(s) of a session channel.
 *
 * Both handle and channel_name CAN NOT be NULL.
 *
 * Return the size (number of entries) of the "lttng_event" array. Caller must
 * free events. On error a negative LTTng error code is returned.
 */
extern int lttng_list_events(struct lttng_handle *handle,
		const char *channel_name, struct lttng_event **events);

/*
 * List the available tracepoints of a specific lttng domain.
 *
 * The handle CAN NOT be NULL.
 *
 * Return the size (number of entries) of the "lttng_event" array.  Caller must
 * free events. On error a negative LTTng error code is returned.
 */
extern int lttng_list_tracepoints(struct lttng_handle *handle,
		struct lttng_event **events);

/*
 * List the available tracepoints fields of a specific lttng domain.
 *
 * The handle CAN NOT be NULL.
 *
 * Return the size (number of entries) of the "lttng_event_field" array.
 * Caller must free fields. On error a negative LTTng error code is
 * returned.
 */
extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
		struct lttng_event_field **fields);

/*
 * Add context to event(s) for a specific channel (or for all).
 *
 * If the channel_name is NULL and they are no channel for the domain, the
 * default channel is created (channel0). The context is then added on ALL
 * channels since no name was specified.
 *
 * The event_name is ignored since adding a context to an event is not possible
 * for now.
 *
 * Return 0 on success else a negative LTTng error code.
 */
extern int lttng_add_context(struct lttng_handle *handle,
		struct lttng_event_context *ctx, const char *event_name,
		const char *channel_name);

/*
 * Create or enable an event (or events) for a channel.
 *
 * If the event you are trying to enable does not exist, it will be created,
 * else it is enabled. If channel_name is NULL, the default channel is used
 * (channel0).
 *
 * The handle and ev params can not be NULL.
 *
 * Return 0 on success else a negative LTTng error code.
 */
extern int lttng_enable_event(struct lttng_handle *handle,
		struct lttng_event *ev, const char *channel_name);

/*
 * Create or enable an event with a specific filter.
 *
 * If the event you are trying to enable does not exist, it will be created,
 * else it is enabled.
 * If ev is NULL, all events are enabled with that filter.
 * If channel_name is NULL, the default channel is used (channel0) and created
 * if not found.
 * If filter_expression is NULL, an event without associated filter is
 * created.
 *
 * Return 0 on success else a negative LTTng error code.
 */
extern int lttng_enable_event_with_filter(struct lttng_handle *handle,
		struct lttng_event *event, const char *channel_name,
		const char *filter_expression);

/*
 * Create or enable an event with a filter and/or exclusions.
 *
 * If the event you are trying to enable does not exist, it will be created,
 * else it is enabled.
 * If ev is NULL, all events are enabled with the filter and exclusion options.
 * If channel_name is NULL, the default channel is used (channel0) and created
 * if not found.
 * If filter_expression is NULL, an event without associated filter is
 * created.
 * If exclusion count is zero, the event will be created without exclusions.
 *
 * Return 0 on success else a negative LTTng error code.
 */
extern int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
		struct lttng_event *event, const char *channel_name,
		const char *filter_expression,
		int exclusion_count, char **exclusion_names);

/*
 * Disable event(s) of a channel and domain.
 *
 * If name is NULL, all events are disabled.
 * If channel_name is NULL, the default channel is used (channel0).
 *
 * Return 0 on success else a negative LTTng error code.
 */
extern int lttng_disable_event(struct lttng_handle *handle,
		const char *name, const char *channel_name);

#ifdef __cplusplus
}
#endif

#endif /* LTTNG_EVENT_H */
Commit	Line	Data
1239a312 DG	1	/*
	2	* Copyright (C) 2014 - David Goulet <dgoulet@efficios.com>
	3	*
	4	* This library is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU Lesser General Public License, version 2.1 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This library is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
	11	* for more details.
	12	*
	13	* You should have received a copy of the GNU Lesser General Public License
	14	* along with this library; if not, write to the Free Software Foundation,
	15	* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	16	*/
	17
	18	#ifndef LTTNG_EVENT_H
	19	#define LTTNG_EVENT_H
	20
	21	#ifdef __cplusplus
	22	extern "C" {
	23	#endif
	24
	25	#include <lttng/handle.h>
	26
	27	/*
	28	* Instrumentation type of tracing event.
	29	*/
	30	enum lttng_event_type {
	31	LTTNG_EVENT_ALL = -1,
	32	LTTNG_EVENT_TRACEPOINT = 0,
	33	LTTNG_EVENT_PROBE = 1,
	34	LTTNG_EVENT_FUNCTION = 2,
	35	LTTNG_EVENT_FUNCTION_ENTRY = 3,
	36	LTTNG_EVENT_NOOP = 4,
	37	LTTNG_EVENT_SYSCALL = 5,
	38	};
	39
	40	/*
	41	* Loglevel information.
	42	*/
	43	enum lttng_loglevel_type {
	44	LTTNG_EVENT_LOGLEVEL_ALL = 0,
	45	LTTNG_EVENT_LOGLEVEL_RANGE = 1,
	46	LTTNG_EVENT_LOGLEVEL_SINGLE = 2,
	47	};
	48
	49	/*
	50	* Available loglevels.
	51	*/
	52	enum lttng_loglevel {
	53	LTTNG_LOGLEVEL_EMERG = 0,
	54	LTTNG_LOGLEVEL_ALERT = 1,
	55	LTTNG_LOGLEVEL_CRIT = 2,
	56	LTTNG_LOGLEVEL_ERR = 3,
	57	LTTNG_LOGLEVEL_WARNING = 4,
	58	LTTNG_LOGLEVEL_NOTICE = 5,
	59	LTTNG_LOGLEVEL_INFO = 6,
	60	LTTNG_LOGLEVEL_DEBUG_SYSTEM = 7,
	61	LTTNG_LOGLEVEL_DEBUG_PROGRAM = 8,
	62	LTTNG_LOGLEVEL_DEBUG_PROCESS = 9,
	63	LTTNG_LOGLEVEL_DEBUG_MODULE = 10,
	64	LTTNG_LOGLEVEL_DEBUG_UNIT = 11,
65	LTTNG_LOGLEVEL_DEBUG_FUNCTION = 12,
66	LTTNG_LOGLEVEL_DEBUG_LINE = 13,
67	LTTNG_LOGLEVEL_DEBUG = 14,
68	};
69
70	/*
71	* Available loglevels for the JUL domain. Those are an exact map from the
72	* class java.util.logging.Level.
73	*/
74	enum lttng_loglevel_jul {
75	LTTNG_LOGLEVEL_JUL_OFF = INT32_MAX,
76	LTTNG_LOGLEVEL_JUL_SEVERE = 1000,
77	LTTNG_LOGLEVEL_JUL_WARNING = 900,
78	LTTNG_LOGLEVEL_JUL_INFO = 800,
79	LTTNG_LOGLEVEL_JUL_CONFIG = 700,
80	LTTNG_LOGLEVEL_JUL_FINE = 500,
81	LTTNG_LOGLEVEL_JUL_FINER = 400,
82	LTTNG_LOGLEVEL_JUL_FINEST = 300,
83	LTTNG_LOGLEVEL_JUL_ALL = INT32_MIN,
84	};
85
86	/*
87	* LTTng consumer mode
88	*/
89	enum lttng_event_output {
90	LTTNG_EVENT_SPLICE = 0,
91	LTTNG_EVENT_MMAP = 1,
92	};
93
94	/* Event context possible type */
95	enum lttng_event_context_type {
96	LTTNG_EVENT_CONTEXT_PID = 0,
97	LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1, /* Backward compat. */
98	LTTNG_EVENT_CONTEXT_PROCNAME = 2,
99	LTTNG_EVENT_CONTEXT_PRIO = 3,
100	LTTNG_EVENT_CONTEXT_NICE = 4,
101	LTTNG_EVENT_CONTEXT_VPID = 5,
102	LTTNG_EVENT_CONTEXT_TID = 6,
103	LTTNG_EVENT_CONTEXT_VTID = 7,
104	LTTNG_EVENT_CONTEXT_PPID = 8,
105	LTTNG_EVENT_CONTEXT_VPPID = 9,
106	LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10,
107	LTTNG_EVENT_CONTEXT_HOSTNAME = 11,
108	LTTNG_EVENT_CONTEXT_IP = 12,
109	LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER = 13,
110	LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER = 14,
111	};
112
113	enum lttng_event_field_type {
114	LTTNG_EVENT_FIELD_OTHER = 0,
115	LTTNG_EVENT_FIELD_INTEGER = 1,
116	LTTNG_EVENT_FIELD_ENUM = 2,
117	LTTNG_EVENT_FIELD_FLOAT = 3,
118	LTTNG_EVENT_FIELD_STRING = 4,
119	};
120
121	/*
122	* Perf counter attributes
123	*
124	* The structures should be initialized to zero before use.
125	*/
126	#define LTTNG_PERF_EVENT_PADDING1 16
127	struct lttng_event_perf_counter_ctx {
128	uint32_t type;
129	uint64_t config;
130	char name[LTTNG_SYMBOL_NAME_LEN];
131
132	char padding[LTTNG_PERF_EVENT_PADDING1];
133	};
134
135	/*
136	* Event/channel context
137	*
138	* The structures should be initialized to zero before use.
139	*/
140	#define LTTNG_EVENT_CONTEXT_PADDING1 16
141	#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
142	struct lttng_event_context {
143	enum lttng_event_context_type ctx;
144	char padding[LTTNG_EVENT_CONTEXT_PADDING1];
145
146	union {
147	struct lttng_event_perf_counter_ctx perf_counter;
148	char padding[LTTNG_EVENT_CONTEXT_PADDING2];
149	} u;
150	};
151
152	/*
153	* Event probe.
154	*
155	* Either addr is used or symbol_name and offset.
156	*
157	* The structures should be initialized to zero before use.
158	*/
159	#define LTTNG_EVENT_PROBE_PADDING1 16
160	struct lttng_event_probe_attr {
161	uint64_t addr;
162
163	uint64_t offset;
164	char symbol_name[LTTNG_SYMBOL_NAME_LEN];
165
166	char padding[LTTNG_EVENT_PROBE_PADDING1];
167	};
168
169	/*
170	* Function tracer
171	*
172	* The structures should be initialized to zero before use.
173	*/
174	#define LTTNG_EVENT_FUNCTION_PADDING1 16
175	struct lttng_event_function_attr {
176	char symbol_name[LTTNG_SYMBOL_NAME_LEN];
177
178	char padding[LTTNG_EVENT_FUNCTION_PADDING1];
179	};
180
181	/*
182	* Generic lttng event
183	*
184	* The structures should be initialized to zero before use.
185	*/
186	#define LTTNG_EVENT_PADDING1 14
187	#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
188	struct lttng_event {
189	enum lttng_event_type type;
190	char name[LTTNG_SYMBOL_NAME_LEN];
191
192	enum lttng_loglevel_type loglevel_type;
193	int loglevel;
194
195	int32_t enabled; /* Does not apply: -1 */
196	pid_t pid;
197	unsigned char filter; /* filter enabled ? */
198	unsigned char exclusion; /* exclusions added ? */
199
200	char padding[LTTNG_EVENT_PADDING1];
201
202	/* Per event type configuration */
203	union {
204	struct lttng_event_probe_attr probe;
205	struct lttng_event_function_attr ftrace;
206
207	char padding[LTTNG_EVENT_PADDING2];
208	} attr;
209	};
210
211	#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
212	struct lttng_event_field {
213	char field_name[LTTNG_SYMBOL_NAME_LEN];
214	enum lttng_event_field_type type;
215	char padding[LTTNG_EVENT_FIELD_PADDING];
216	struct lttng_event event;
217	int nowrite;
218	};
219
220	/*
221	* List the event(s) of a session channel.
222	*
223	* Both handle and channel_name CAN NOT be NULL.
224	*
225	* Return the size (number of entries) of the "lttng_event" array. Caller must
226	* free events. On error a negative LTTng error code is returned.
227	*/
228	extern int lttng_list_events(struct lttng_handle *handle,
229	const char channel_name, struct lttng_event *events);
230
231	/*
232	* List the available tracepoints of a specific lttng domain.
233	*
234	* The handle CAN NOT be NULL.
235	*
236	* Return the size (number of entries) of the "lttng_event" array. Caller must
237	* free events. On error a negative LTTng error code is returned.
238	*/
239	extern int lttng_list_tracepoints(struct lttng_handle *handle,
240	struct lttng_event **events);
241
242	/*
243	* List the available tracepoints fields of a specific lttng domain.
244	*
245	* The handle CAN NOT be NULL.
246	*
247	* Return the size (number of entries) of the "lttng_event_field" array.
248	* Caller must free fields. On error a negative LTTng error code is
249	* returned.
250	*/
251	extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
252	struct lttng_event_field **fields);
253
254	/*
255	* Add context to event(s) for a specific channel (or for all).
256	*
257	* If the channel_name is NULL and they are no channel for the domain, the
258	* default channel is created (channel0). The context is then added on ALL
259	* channels since no name was specified.
260	*
261	* The event_name is ignored since adding a context to an event is not possible
262	* for now.
263	*
264	* Return 0 on success else a negative LTTng error code.
265	*/
266	extern int lttng_add_context(struct lttng_handle *handle,
267	struct lttng_event_context ctx, const char event_name,
268	const char *channel_name);
269
270	/*
271	* Create or enable an event (or events) for a channel.
272	*
273	* If the event you are trying to enable does not exist, it will be created,
274	* else it is enabled. If channel_name is NULL, the default channel is used
275	* (channel0).
276	*
277	* The handle and ev params can not be NULL.
278	*
279	* Return 0 on success else a negative LTTng error code.
280	*/
281	extern int lttng_enable_event(struct lttng_handle *handle,
282	struct lttng_event ev, const char channel_name);
283
284	/*
285	* Create or enable an event with a specific filter.
286	*
287	* If the event you are trying to enable does not exist, it will be created,
288	* else it is enabled.
289	* If ev is NULL, all events are enabled with that filter.
290	* If channel_name is NULL, the default channel is used (channel0) and created
291	* if not found.
292	* If filter_expression is NULL, an event without associated filter is
293	* created.
294	*
295	* Return 0 on success else a negative LTTng error code.
296	*/
297	extern int lttng_enable_event_with_filter(struct lttng_handle *handle,
298	struct lttng_event event, const char channel_name,
299	const char *filter_expression);
300
301	/*
302	* Create or enable an event with a filter and/or exclusions.
303	*
304	* If the event you are trying to enable does not exist, it will be created,
305	* else it is enabled.
306	* If ev is NULL, all events are enabled with the filter and exclusion options.
307	* If channel_name is NULL, the default channel is used (channel0) and created
308	* if not found.
309	* If filter_expression is NULL, an event without associated filter is
310	* created.
311	* If exclusion count is zero, the event will be created without exclusions.
312	*
313	* Return 0 on success else a negative LTTng error code.
314	*/
315	extern int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
316	struct lttng_event event, const char channel_name,
317	const char *filter_expression,
318	int exclusion_count, char **exclusion_names);
319
320	/*
321	* Disable event(s) of a channel and domain.
322	*
323	* If name is NULL, all events are disabled.
324	* If channel_name is NULL, the default channel is used (channel0).
325	*
326	* Return 0 on success else a negative LTTng error code.
327	*/
328	extern int lttng_disable_event(struct lttng_handle *handle,
329	const char name, const char channel_name);
330
331	#ifdef __cplusplus
332	}
333	#endif
334
335	#endif /* LTTNG_EVENT_H */