Rename liblttsessiondcomm to liblttng-sessiond-comm, install it.
[lttng-tools.git] / include / lttng / lttng.h
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826d496d 1/*
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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 *
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8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; only
11 * version 2.1 of the License.
12 *
13 * This library is distributed in the hope that it will be useful,
fac6795d 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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21 */
22
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23#ifndef _LTTNG_H
24#define _LTTNG_H
fac6795d 25
f3ed775e 26#include <asm/types.h>
7d29a247 27#include <sys/types.h>
f3ed775e 28#include <stdint.h>
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29#include <limits.h>
30
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31/* Default unix group name for tracing. */
32#define LTTNG_DEFAULT_TRACING_GROUP "tracing"
fac6795d 33
b7384347 34/* Environment variable to set session daemon binary path. */
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35#define LTTNG_SESSIOND_PATH_ENV "LTTNG_SESSIOND_PATH"
36
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37/* Default trace output directory name */
38#define LTTNG_DEFAULT_TRACE_DIR_NAME "lttng-traces"
39
b7384347 40/*
e6ddca71 41 * Event symbol length. Copied from LTTng kernel ABI.
1657e9bb 42 */
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43#define LTTNG_SYMBOL_NAME_LEN 128
44
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45/*
46 * Every lttng_event_* structure both apply to kernel event and user-space
47 * event.
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48 */
49
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50/*
51 * Domain type are the different possible tracers.
52 */
53enum lttng_domain_type {
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54 LTTNG_DOMAIN_KERNEL = 1,
55 LTTNG_DOMAIN_UST = 2,
56 LTTNG_DOMAIN_UST_EXEC_NAME = 3,
57 LTTNG_DOMAIN_UST_PID = 4,
58 LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
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59};
60
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61/*
62 * Instrumentation type of tracing event.
63 */
f3ed775e 64enum lttng_event_type {
e6ddca71 65 LTTNG_EVENT_TRACEPOINT,
7d29a247 66 LTTNG_EVENT_PROBE,
f3ed775e 67 LTTNG_EVENT_FUNCTION,
8f0d098b 68 LTTNG_EVENT_FUNCTION_ENTRY,
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69};
70
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71/*
72 * LTTng consumer mode
73 */
74enum lttng_event_output {
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75 LTTNG_EVENT_SPLICE = 0,
76 LTTNG_EVENT_MMAP = 1,
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77};
78
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79/* Event context possible type */
80enum lttng_event_context_type {
81 LTTNG_EVENT_CONTEXT_PID = 0,
82 LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
83 LTTNG_EVENT_CONTEXT_COMM = 2,
84 LTTNG_EVENT_CONTEXT_PRIO = 3,
85 LTTNG_EVENT_CONTEXT_NICE = 4,
86 LTTNG_EVENT_CONTEXT_VPID = 5,
87 LTTNG_EVENT_CONTEXT_TID = 6,
88 LTTNG_EVENT_CONTEXT_VTID = 7,
89 LTTNG_EVENT_CONTEXT_PPID = 8,
90 LTTNG_EVENT_CONTEXT_VPPID = 9,
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91};
92
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93enum lttng_calibrate_type {
94 LTTNG_CALIBRATE_FUNCTION = 0,
95};
96
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97struct lttng_domain {
98 enum lttng_domain_type type;
99 union {
100 pid_t pid;
101 char exec_name[NAME_MAX];
102 } attr;
103};
104
d65106b1 105/* Perf counter attributes */
7d29a247 106struct lttng_event_perf_counter_ctx {
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107 uint32_t type;
108 uint64_t config;
109 char name[LTTNG_SYMBOL_NAME_LEN];
110};
111
112/* Event/Channel context */
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113struct lttng_event_context {
114 enum lttng_event_context_type ctx;
d65106b1 115 union {
7d29a247 116 struct lttng_event_perf_counter_ctx perf_counter;
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117 } u;
118};
119
b7384347 120/*
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121 * Event probe.
122 *
123 * Either addr is used or symbol_name and offset.
57167058 124 */
7d29a247 125struct lttng_event_probe_attr {
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126 uint64_t addr;
127
128 uint64_t offset;
129 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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130};
131
b7384347 132/*
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133 * Function tracer
134 */
135struct lttng_event_function_attr {
136 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
137};
138
139/*
140 * Generic lttng event
141 */
142struct lttng_event {
143 char name[LTTNG_SYMBOL_NAME_LEN];
144 enum lttng_event_type type;
9f19cc17 145 uint32_t enabled;
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146 /* Per event type configuration */
147 union {
7d29a247 148 struct lttng_event_probe_attr probe;
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149 struct lttng_event_function_attr ftrace;
150 } attr;
151};
152
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153/*
154 * Tracer channel attributes. For both kernel and user-space.
155 */
f3ed775e 156struct lttng_channel_attr {
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157 int overwrite; /* 1: overwrite, 0: discard */
158 uint64_t subbuf_size; /* bytes */
159 uint64_t num_subbuf; /* power of 2 */
160 unsigned int switch_timer_interval; /* usec */
161 unsigned int read_timer_interval; /* usec */
f05b5f07 162 enum lttng_event_output output; /* splice, mmap */
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163};
164
165/*
e6ddca71 166 * Channel information structure. For both kernel and user-space.
1657e9bb 167 */
e6ddca71 168struct lttng_channel {
1657e9bb 169 char name[NAME_MAX];
9f19cc17 170 uint32_t enabled;
e6ddca71 171 struct lttng_channel_attr attr;
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172};
173
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174struct lttng_calibrate {
175 enum lttng_calibrate_type type;
176};
177
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178/*
179 * Basic session information.
180 *
181 * This is an 'output data' meaning that it only comes *from* the session
182 * daemon *to* the lttng client. It's basically a 'human' representation of
183 * tracing entities (here a session).
184 */
185struct lttng_session {
f3ed775e 186 char name[NAME_MAX];
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187 /* The path where traces are written */
188 char path[PATH_MAX];
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189};
190
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191/*
192 * Public LTTng control API
193 *
194 * For functions having a lttng domain type as parameter, if a bad value is
195 * given, NO default is applied and an error is returned.
196 *
197 * On success, all functions of the API return 0 or the size of the allocated
198 * array.
199 *
200 * On error, a negative value is returned being a specific lttng-tools error
201 * code which can be humanly interpreted with lttng_get_readable_code(err).
202 */
203
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204/*
205 * Session daemon control
206 */
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207
208/*
209 * Create tracing session using a name and a path where trace will be written.
210 */
38057ed1 211extern int lttng_create_session(const char *name, const char *path);
f3ed775e 212
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213/*
214 * Destroy tracing session.
215 *
216 * The session will not be useable anymore, tracing will stopped for all
217 * registered trace and tracing buffers will be flushed.
218 */
38057ed1 219extern int lttng_destroy_session(const char *name);
f3ed775e 220
e6ddca71 221/*
9f19cc17 222 * List all tracing sessions.
7d29a247 223 *
9f19cc17 224 * Return the size of the "lttng_session" array. Caller must free(3).
e6ddca71 225 */
ca95a216 226extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 227
9f19cc17 228/*
2a71efd5 229 * List registered domain(s) of a session.
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230 *
231 * Return the size of the "lttng_domain" array. Caller must free(3).
232 */
233extern int lttng_list_domains(const char *session_name,
234 struct lttng_domain **domains);
235
236/*
237 * List channel(s) of a session.
238 *
239 * Return the size of the "lttng_channel" array. Caller must free(3).
240 */
241extern int lttng_list_channels(struct lttng_domain *domain,
242 const char *session_name, struct lttng_channel **channels);
243
244/*
245 * List event(s) of a session channel.
246 *
247 * Return the size of the "lttng_event" array. Caller must free(3).
248 */
249extern int lttng_list_events(struct lttng_domain *domain,
250 const char *session_name, const char *channel_name,
251 struct lttng_event **events);
252
253/*
2a71efd5 254 * List available tracepoints of domain.
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255 *
256 * Return the size of the "lttng_event" array. Caller must free(3).
257 */
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258extern int lttng_list_tracepoints(struct lttng_domain *domain,
259 struct lttng_event **events);
9f19cc17 260
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261/*
262 * Check if a session daemon is alive.
263 */
947308c4 264extern int lttng_session_daemon_alive(void);
f3ed775e 265
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266/*
267 * Set tracing group for the *current* flow of execution.
268 */
b7384347 269extern int lttng_set_tracing_group(const char *name);
f3ed775e 270
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271/*
272 * Set the session name of the *current* flow of execution.
273 *
274 * This is a VERY important things to do before doing any tracing actions. If
275 * it's not done, you'll get an error saying that the session is not found.
276 * It avoids the use of a session name on every API call.
277 */
38057ed1 278extern void lttng_set_session_name(const char *name);
f3ed775e 279
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280/*
281 * Return a human readable error message of a lttng-tools error code.
282 *
283 * Parameter MUST be a negative value or else you'll get a generic message.
284 */
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285extern const char *lttng_get_readable_code(int code);
286
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287/*
288 * Start tracing for *all* registered trace (kernel and user-space).
289 */
38057ed1 290extern int lttng_start_tracing(const char *session_name);
f3ed775e 291
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292/*
293 * Stop tracing for *all* registered trace (kernel and user-space).
294 */
38057ed1 295extern int lttng_stop_tracing(const char *session_name);
f3ed775e 296
b7384347 297/*
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298 * Add context to event for a specific channel.
299 *
300 * If event_name is NULL, the context is applied to all event of the channel.
301 * If channel_name is NULL, a lookup of the event's channel is done.
302 * If both are NULL, the context is applied on all events of all channels.
b7384347 303 */
f3ed775e 304
7d29a247 305extern int lttng_add_context(struct lttng_domain *domain,
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306 struct lttng_event_context *ctx, const char *event_name,
307 const char *channel_name);
f3ed775e 308
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309/*
310 * Create or enable a kernel event.
311 *
312 * If the event you are trying to enable does not exist, it will be created,
313 * else it is enabled.
314 *
315 * If channel_name is NULL, the default channel is used (channel0).
316 */
317extern int lttng_enable_event(struct lttng_domain *domain, struct lttng_event *ev,
38057ed1 318 const char *channel_name);
f3ed775e 319
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320/*
321 * Create or enable a kernel channel.
322 *
323 * If name is NULL, the default channel is enabled (channel0).
324 */
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325extern int lttng_enable_channel(struct lttng_domain *domain,
326 struct lttng_channel *chan);
f3ed775e 327
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328/*
329 * Disable kernel event.
330 *
331 * If channel_name is NULL, the default channel is used (channel0).
332 */
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333extern int lttng_disable_event(struct lttng_domain *domain, const char *name,
334 const char *channel_name);
fac6795d 335
1df4dedd 336/*
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337 * Disable kernel channel.
338 *
339 * If channel_name is NULL, the default channel is disabled (channel0).
1df4dedd 340 */
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341extern int lttng_disable_channel(struct lttng_domain *domain,
342 const char *name);
1df4dedd 343
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344/*
345 * Calibrate LTTng overhead.
346 */
347extern int lttng_calibrate(struct lttng_domain *domain,
348 struct lttng_calibrate *calibrate);
349
b7384347 350#endif /* _LTTNG_H */
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