Remove underscore from ifndef of lttng.h
[lttng-tools.git] / include / lttng / lttng.h
CommitLineData
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 *
1e46a50f 8 * This library is free software; you can redistribute it and/or modify it
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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 *
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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 *
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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
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20 */
21
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22#ifndef LTTNG_H
23#define LTTNG_H
fac6795d 24
57167058 25#include <limits.h>
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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
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34/*
35 * Every lttng_event_* structure both apply to kernel event and user-space
36 * event.
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37 */
38
7d29a247 39/*
1e46a50f 40 * Domain types: the different possible tracers.
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41 */
42enum lttng_domain_type {
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43 LTTNG_DOMAIN_KERNEL = 1,
44 LTTNG_DOMAIN_UST = 2,
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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 *
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51 LTTNG_DOMAIN_UST_EXEC_NAME = 3,
52 LTTNG_DOMAIN_UST_PID = 4,
53 LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
d78d6610 54 */
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55};
56
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57/*
58 * Instrumentation type of tracing event.
59 */
f3ed775e 60enum lttng_event_type {
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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,
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68};
69
70/*
71 * Loglevel information.
72 */
73enum lttng_loglevel_type {
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74 LTTNG_EVENT_LOGLEVEL_ALL = 0,
75 LTTNG_EVENT_LOGLEVEL_RANGE = 1,
76 LTTNG_EVENT_LOGLEVEL_SINGLE = 2,
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77};
78
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79/*
80 * Available loglevels.
81 */
82enum lttng_loglevel {
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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,
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98};
99
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100/*
101 * LTTng consumer mode
102 */
103enum lttng_event_output {
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104 LTTNG_EVENT_SPLICE = 0,
105 LTTNG_EVENT_MMAP = 1,
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106};
107
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108/* Event context possible type */
109enum lttng_event_context_type {
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110 LTTNG_EVENT_CONTEXT_PID = 0,
111 LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
9197c5c4 112 LTTNG_EVENT_CONTEXT_PROCNAME = 2,
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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,
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121};
122
d0254c7c 123enum lttng_calibrate_type {
d78d6610 124 LTTNG_CALIBRATE_FUNCTION = 0,
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125};
126
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127/* Health component for the health check function. */
128enum lttng_health_component {
129 LTTNG_HEALTH_CMD,
139ac872 130 LTTNG_HEALTH_APP_MANAGE,
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131 LTTNG_HEALTH_APP_REG,
132 LTTNG_HEALTH_KERNEL,
133 LTTNG_HEALTH_CONSUMER,
134 LTTNG_HEALTH_ALL,
135};
136
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137/*
138 * The structures should be initialized to zero before use.
139 */
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140#define LTTNG_DOMAIN_PADDING1 16
141#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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142struct lttng_domain {
143 enum lttng_domain_type type;
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144 char padding[LTTNG_DOMAIN_PADDING1];
145
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146 union {
147 pid_t pid;
148 char exec_name[NAME_MAX];
8d326ab9 149 char padding[LTTNG_DOMAIN_PADDING2];
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150 } attr;
151};
152
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153/*
154 * Perf counter attributes
155 *
156 * The structures should be initialized to zero before use.
157 */
8d326ab9 158#define LTTNG_PERF_EVENT_PADDING1 16
7d29a247 159struct lttng_event_perf_counter_ctx {
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160 uint32_t type;
161 uint64_t config;
162 char name[LTTNG_SYMBOL_NAME_LEN];
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163
164 char padding[LTTNG_PERF_EVENT_PADDING1];
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165};
166
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167/*
168 * Event/channel context
169 *
170 * The structures should be initialized to zero before use.
171 */
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172#define LTTNG_EVENT_CONTEXT_PADDING1 16
173#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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174struct lttng_event_context {
175 enum lttng_event_context_type ctx;
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176 char padding[LTTNG_EVENT_CONTEXT_PADDING1];
177
d65106b1 178 union {
7d29a247 179 struct lttng_event_perf_counter_ctx perf_counter;
8d326ab9 180 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
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181 } u;
182};
183
b7384347 184/*
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185 * Event probe.
186 *
187 * Either addr is used or symbol_name and offset.
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188 *
189 * The structures should be initialized to zero before use.
57167058 190 */
8d326ab9 191#define LTTNG_EVENT_PROBE_PADDING1 16
7d29a247 192struct lttng_event_probe_attr {
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193 uint64_t addr;
194
195 uint64_t offset;
196 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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197
198 char padding[LTTNG_EVENT_PROBE_PADDING1];
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199};
200
b7384347 201/*
f3ed775e 202 * Function tracer
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203 *
204 * The structures should be initialized to zero before use.
f3ed775e 205 */
8d326ab9 206#define LTTNG_EVENT_FUNCTION_PADDING1 16
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207struct lttng_event_function_attr {
208 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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209
210 char padding[LTTNG_EVENT_FUNCTION_PADDING1];
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211};
212
213/*
214 * Generic lttng event
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215 *
216 * The structures should be initialized to zero before use.
f3ed775e 217 */
fceb65df 218#define LTTNG_EVENT_PADDING1 15
8d326ab9 219#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 220struct lttng_event {
0cda4f28 221 enum lttng_event_type type;
f3ed775e 222 char name[LTTNG_SYMBOL_NAME_LEN];
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223
224 enum lttng_loglevel_type loglevel_type;
8005f29a 225 int loglevel;
0cda4f28 226
35dc4d62 227 int32_t enabled; /* Does not apply: -1 */
b551a063 228 pid_t pid;
fceb65df 229 unsigned char filter; /* filter enabled ? */
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230
231 char padding[LTTNG_EVENT_PADDING1];
232
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233 /* Per event type configuration */
234 union {
7d29a247 235 struct lttng_event_probe_attr probe;
f3ed775e 236 struct lttng_event_function_attr ftrace;
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237
238 char padding[LTTNG_EVENT_PADDING2];
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239 } attr;
240};
241
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242enum lttng_event_field_type {
243 LTTNG_EVENT_FIELD_OTHER = 0,
244 LTTNG_EVENT_FIELD_INTEGER = 1,
245 LTTNG_EVENT_FIELD_ENUM = 2,
246 LTTNG_EVENT_FIELD_FLOAT = 3,
247 LTTNG_EVENT_FIELD_STRING = 4,
248};
249
250#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
251struct lttng_event_field {
252 char field_name[LTTNG_SYMBOL_NAME_LEN];
253 enum lttng_event_field_type type;
254 char padding[LTTNG_EVENT_FIELD_PADDING];
255 struct lttng_event event;
256};
257
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258/*
259 * Tracer channel attributes. For both kernel and user-space.
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260 *
261 * The structures should be initialized to zero before use.
e6ddca71 262 */
8d326ab9 263#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 264struct lttng_channel_attr {
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265 int overwrite; /* 1: overwrite, 0: discard */
266 uint64_t subbuf_size; /* bytes */
267 uint64_t num_subbuf; /* power of 2 */
268 unsigned int switch_timer_interval; /* usec */
269 unsigned int read_timer_interval; /* usec */
f05b5f07 270 enum lttng_event_output output; /* splice, mmap */
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271
272 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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273};
274
275/*
e6ddca71 276 * Channel information structure. For both kernel and user-space.
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277 *
278 * The structures should be initialized to zero before use.
1657e9bb 279 */
8d326ab9 280#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 281struct lttng_channel {
045e5491 282 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 283 uint32_t enabled;
e6ddca71 284 struct lttng_channel_attr attr;
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285
286 char padding[LTTNG_CHANNEL_PADDING1];
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287};
288
8d326ab9 289#define LTTNG_CALIBRATE_PADDING1 16
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290struct lttng_calibrate {
291 enum lttng_calibrate_type type;
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292
293 char padding[LTTNG_CALIBRATE_PADDING1];
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294};
295
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296/*
297 * Basic session information.
298 *
299 * This is an 'output data' meaning that it only comes *from* the session
300 * daemon *to* the lttng client. It's basically a 'human' representation of
301 * tracing entities (here a session).
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302 *
303 * The structures should be initialized to zero before use.
e6ddca71 304 */
8d326ab9 305#define LTTNG_SESSION_PADDING1 16
e6ddca71 306struct lttng_session {
f3ed775e 307 char name[NAME_MAX];
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308 /* The path where traces are written */
309 char path[PATH_MAX];
464dd62d 310 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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311
312 char padding[LTTNG_SESSION_PADDING1];
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313};
314
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315/*
316 * Handle used as a context for commands.
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317 *
318 * The structures should be initialized to zero before use.
cd80958d 319 */
8d326ab9 320#define LTTNG_HANDLE_PADDING1 16
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321struct lttng_handle {
322 char session_name[NAME_MAX];
323 struct lttng_domain domain;
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324
325 char padding[LTTNG_HANDLE_PADDING1];
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326};
327
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328/*
329 * Public LTTng control API
330 *
1e46a50f 331 * For functions having an lttng domain type as parameter, if a bad value is
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332 * given, NO default is applied and an error is returned.
333 *
334 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 335 * array (in bytes).
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336 *
337 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 338 * code which can be humanly interpreted with lttng_strerror(err).
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339 *
340 * Exceptions to this are noted below.
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341 */
342
b7384347 343/*
1e46a50f 344 * Create a handle used as a context for every request made to the library.
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345 *
346 * This handle contains the session name and lttng domain on which the command
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347 * will be executed.
348 * The returned pointer will be NULL in case of malloc() error.
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349 */
350extern struct lttng_handle *lttng_create_handle(const char *session_name,
351 struct lttng_domain *domain);
352
353/*
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354 * Destroy a handle. This will simply free(3) the data pointer returned by
355 * lttng_create_handle(), rendering it unusable.
b7384347 356 */
cd80958d 357extern void lttng_destroy_handle(struct lttng_handle *handle);
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358
359/*
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360 * Create a tracing session using a name and an optional URL.
361 *
362 * If _url_ is NULL, no consumer is created for the session.
00e2e675 363 */
a4b92340 364extern int lttng_create_session(const char *name, const char *url);
00e2e675 365
7d29a247 366/*
1e46a50f 367 * Destroy a tracing session.
7d29a247 368 *
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369 * The session will not be usable anymore, tracing will be stopped for all
370 * registered traces, and the tracing buffers will be flushed.
7d29a247 371 */
843f5df9 372extern int lttng_destroy_session(const char *name);
f3ed775e 373
e6ddca71 374/*
1e46a50f 375 * List all the tracing sessions.
7d29a247 376 *
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377 * Return the size (number of entries) of the "lttng_session" array. Caller
378 * must free(3).
e6ddca71 379 */
ca95a216 380extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 381
9f19cc17 382/*
1e46a50f 383 * List the registered domain(s) of a session.
9f19cc17 384 *
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385 * Return the size (number of entries) of the "lttng_domain" array. Caller
386 * must free(3).
9f19cc17 387 */
330be774 388extern int lttng_list_domains(const char *session_name,
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389 struct lttng_domain **domains);
390
391/*
1e46a50f 392 * List the channel(s) of a session.
9f19cc17 393 *
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394 * Return the size (number of entries) of the "lttng_channel" array. Caller
395 * must free(3).
9f19cc17 396 */
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397extern int lttng_list_channels(struct lttng_handle *handle,
398 struct lttng_channel **channels);
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399
400/*
1e46a50f 401 * List the event(s) of a session channel.
9f19cc17 402 *
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403 * Return the size (number of entries) of the "lttng_event" array.
404 * Caller must free(3).
9f19cc17 405 */
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406extern int lttng_list_events(struct lttng_handle *handle,
407 const char *channel_name, struct lttng_event **events);
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408
409/*
1e46a50f 410 * List the available tracepoints of a specific lttng domain.
9f19cc17 411 *
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412 * Return the size (number of entries) of the "lttng_event" array.
413 * Caller must free(3).
9f19cc17 414 */
cd80958d 415extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 416 struct lttng_event **events);
9f19cc17 417
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418/*
419 * List the available tracepoints fields of a specific lttng domain.
420 *
421 * Return the size (number of entries) of the "lttng_event_field" array.
422 * Caller must free(3).
423 */
424extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
425 struct lttng_event_field **fields);
426
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427/*
428 * Check if a session daemon is alive.
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429 *
430 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 431 */
947308c4 432extern int lttng_session_daemon_alive(void);
f3ed775e 433
7d29a247 434/*
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435 * Set the tracing group for the *current* flow of execution.
436 *
437 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 438 */
b7384347 439extern int lttng_set_tracing_group(const char *name);
f3ed775e 440
7d29a247 441/*
1e46a50f 442 * Return a human-readable error message for an lttng-tools error code.
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443 *
444 * Parameter MUST be a negative value or else you'll get a generic message.
445 */
9a745bc7 446extern const char *lttng_strerror(int code);
b7384347 447
d9800920 448/*
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449 * This call registers an "outside consumer" for a session and an lttng domain.
450 * No consumer will be spawned and all fds/commands will go through the socket
451 * path given (socket_path).
d9800920 452 *
3bd1e081 453 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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454 * command socket. The error socket is not supported yet for roaming consumers.
455 */
456extern int lttng_register_consumer(struct lttng_handle *handle,
457 const char *socket_path);
458
7d29a247 459/*
1e46a50f 460 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 461 */
6a4f824d 462extern int lttng_start_tracing(const char *session_name);
f3ed775e 463
7d29a247 464/*
1e46a50f 465 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 466 */
6a4f824d 467extern int lttng_stop_tracing(const char *session_name);
f3ed775e 468
b7384347 469/*
1e46a50f 470 * Add context to event(s) for a specific channel (or for all).
7d29a247 471 *
1e46a50f 472 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 473 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 474 * If both are NULL, the context is applied to all events of all channels.
b7384347 475 */
cd80958d 476extern int lttng_add_context(struct lttng_handle *handle,
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477 struct lttng_event_context *ctx, const char *event_name,
478 const char *channel_name);
f3ed775e 479
7d29a247 480/*
c8f61fc6 481 * Create or enable an event (or events) for a channel.
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482 *
483 * If the event you are trying to enable does not exist, it will be created,
484 * else it is enabled.
1e46a50f 485 * If event_name is NULL, all events are enabled.
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486 * If channel_name is NULL, the default channel is used (channel0).
487 */
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488extern int lttng_enable_event(struct lttng_handle *handle,
489 struct lttng_event *ev, const char *channel_name);
f3ed775e 490
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491/*
492 * Apply a filter expression to an event.
493 *
494 * If event_name is NULL, the filter is applied to all events of the channel.
495 * If channel_name is NULL, a lookup of the event's channel is done.
496 * If both are NULL, the filter is applied to all events of all channels.
497 */
498extern int lttng_set_event_filter(struct lttng_handle *handle,
499 const char *event_name,
500 const char *channel_name,
501 const char *filter_expression);
7d29a247 502/*
c8f61fc6 503 * Create or enable a channel.
1e46a50f 504 * The channel name cannot be NULL.
7d29a247 505 */
cd80958d 506extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 507 struct lttng_channel *chan);
f3ed775e 508
7d29a247 509/*
c8f61fc6 510 * Disable event(s) of a channel and domain.
7d29a247 511 *
1e46a50f 512 * If event_name is NULL, all events are disabled.
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513 * If channel_name is NULL, the default channel is used (channel0).
514 */
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515extern int lttng_disable_event(struct lttng_handle *handle,
516 const char *name, const char *channel_name);
fac6795d 517
1df4dedd 518/*
c8f61fc6 519 * Disable channel.
7d29a247 520 *
1e46a50f 521 * The channel name cannot be NULL.
1df4dedd 522 */
cd80958d 523extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 524 const char *name);
1df4dedd 525
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526/*
527 * Calibrate LTTng overhead.
528 */
cd80958d 529extern int lttng_calibrate(struct lttng_handle *handle,
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530 struct lttng_calibrate *calibrate);
531
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532/*
533 * Set the default channel attributes for a specific domain and an allocated
534 * lttng_channel_attr pointer.
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535 *
536 * If either or both of the arguments are NULL, nothing happens.
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537 */
538extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
539 struct lttng_channel_attr *attr);
540
00e2e675 541/*
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542 * Set URL for a consumer for a session and domain.
543 *
544 * Both data and control URL must be defined. If both URLs are the same, only
545 * the control URL is used even for network streaming.
00e2e675 546 *
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547 * Default port are 5342 and 5343 respectively for control and data which uses
548 * the TCP protocol.
00e2e675 549 */
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550extern int lttng_set_consumer_url(struct lttng_handle *handle,
551 const char *control_url, const char *data_url);
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552
553/*
554 * Enable the consumer for a session and domain.
555 */
556extern int lttng_enable_consumer(struct lttng_handle *handle);
557
558/*
559 * Disable consumer for a session and domain.
560 */
561extern int lttng_disable_consumer(struct lttng_handle *handle);
562
44a5e5eb
DG
563/*
564 * Check session daemon health for a specific component.
565 *
566 * Return 0 if health is OK or 1 if BAD. A returned value of -1 indicate that
567 * the control library was not able to connect to the session daemon health
568 * socket.
569 *
570 * Any other positive value is an lttcomm error which can be translate with
571 * lttng_strerror().
572 */
573extern int lttng_health_check(enum lttng_health_component c);
574
73db5be4 575#endif /* LTTNG_H */
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