Add C++ support to API header files
[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
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29/* Error codes that can be returned by API calls */
30#include <lttng/lttng-error.h>
31
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32#ifdef __cplusplus
33extern "C" {
34#endif
35
b7384347 36/*
e6ddca71 37 * Event symbol length. Copied from LTTng kernel ABI.
1657e9bb 38 */
8d326ab9 39#define LTTNG_SYMBOL_NAME_LEN 256
f3ed775e 40
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41/*
42 * Every lttng_event_* structure both apply to kernel event and user-space
43 * event.
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44 */
45
7d29a247 46/*
1e46a50f 47 * Domain types: the different possible tracers.
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48 */
49enum lttng_domain_type {
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50 LTTNG_DOMAIN_KERNEL = 1,
51 LTTNG_DOMAIN_UST = 2,
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52
53 /*
54 * For now, the domains below are not implemented. However, we keep them
55 * here in order to retain their enum values for future development. Note
56 * that it is on the roadmap to implement them.
57 *
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58 LTTNG_DOMAIN_UST_EXEC_NAME = 3,
59 LTTNG_DOMAIN_UST_PID = 4,
60 LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5,
d78d6610 61 */
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62};
63
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64/*
65 * Instrumentation type of tracing event.
66 */
f3ed775e 67enum lttng_event_type {
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68 LTTNG_EVENT_ALL = -1,
69 LTTNG_EVENT_TRACEPOINT = 0,
70 LTTNG_EVENT_PROBE = 1,
71 LTTNG_EVENT_FUNCTION = 2,
72 LTTNG_EVENT_FUNCTION_ENTRY = 3,
73 LTTNG_EVENT_NOOP = 4,
74 LTTNG_EVENT_SYSCALL = 5,
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75};
76
77/*
78 * Loglevel information.
79 */
80enum lttng_loglevel_type {
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81 LTTNG_EVENT_LOGLEVEL_ALL = 0,
82 LTTNG_EVENT_LOGLEVEL_RANGE = 1,
83 LTTNG_EVENT_LOGLEVEL_SINGLE = 2,
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84};
85
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86/*
87 * Available loglevels.
88 */
89enum lttng_loglevel {
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90 LTTNG_LOGLEVEL_EMERG = 0,
91 LTTNG_LOGLEVEL_ALERT = 1,
92 LTTNG_LOGLEVEL_CRIT = 2,
93 LTTNG_LOGLEVEL_ERR = 3,
94 LTTNG_LOGLEVEL_WARNING = 4,
95 LTTNG_LOGLEVEL_NOTICE = 5,
96 LTTNG_LOGLEVEL_INFO = 6,
97 LTTNG_LOGLEVEL_DEBUG_SYSTEM = 7,
98 LTTNG_LOGLEVEL_DEBUG_PROGRAM = 8,
99 LTTNG_LOGLEVEL_DEBUG_PROCESS = 9,
100 LTTNG_LOGLEVEL_DEBUG_MODULE = 10,
101 LTTNG_LOGLEVEL_DEBUG_UNIT = 11,
102 LTTNG_LOGLEVEL_DEBUG_FUNCTION = 12,
103 LTTNG_LOGLEVEL_DEBUG_LINE = 13,
104 LTTNG_LOGLEVEL_DEBUG = 14,
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105};
106
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107/*
108 * LTTng consumer mode
109 */
110enum lttng_event_output {
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111 LTTNG_EVENT_SPLICE = 0,
112 LTTNG_EVENT_MMAP = 1,
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113};
114
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115/* Event context possible type */
116enum lttng_event_context_type {
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117 LTTNG_EVENT_CONTEXT_PID = 0,
118 LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1,
9197c5c4 119 LTTNG_EVENT_CONTEXT_PROCNAME = 2,
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120 LTTNG_EVENT_CONTEXT_PRIO = 3,
121 LTTNG_EVENT_CONTEXT_NICE = 4,
122 LTTNG_EVENT_CONTEXT_VPID = 5,
123 LTTNG_EVENT_CONTEXT_TID = 6,
124 LTTNG_EVENT_CONTEXT_VTID = 7,
125 LTTNG_EVENT_CONTEXT_PPID = 8,
126 LTTNG_EVENT_CONTEXT_VPPID = 9,
9197c5c4 127 LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10,
54773d68 128 LTTNG_EVENT_CONTEXT_HOSTNAME = 11,
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129};
130
d0254c7c 131enum lttng_calibrate_type {
d78d6610 132 LTTNG_CALIBRATE_FUNCTION = 0,
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133};
134
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135/* Health component for the health check function. */
136enum lttng_health_component {
137 LTTNG_HEALTH_CMD,
139ac872 138 LTTNG_HEALTH_APP_MANAGE,
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139 LTTNG_HEALTH_APP_REG,
140 LTTNG_HEALTH_KERNEL,
141 LTTNG_HEALTH_CONSUMER,
142 LTTNG_HEALTH_ALL,
143};
144
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145/*
146 * The structures should be initialized to zero before use.
147 */
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148#define LTTNG_DOMAIN_PADDING1 16
149#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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150struct lttng_domain {
151 enum lttng_domain_type type;
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152 char padding[LTTNG_DOMAIN_PADDING1];
153
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154 union {
155 pid_t pid;
156 char exec_name[NAME_MAX];
8d326ab9 157 char padding[LTTNG_DOMAIN_PADDING2];
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158 } attr;
159};
160
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161/*
162 * Perf counter attributes
163 *
164 * The structures should be initialized to zero before use.
165 */
8d326ab9 166#define LTTNG_PERF_EVENT_PADDING1 16
7d29a247 167struct lttng_event_perf_counter_ctx {
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168 uint32_t type;
169 uint64_t config;
170 char name[LTTNG_SYMBOL_NAME_LEN];
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171
172 char padding[LTTNG_PERF_EVENT_PADDING1];
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173};
174
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175/*
176 * Event/channel context
177 *
178 * The structures should be initialized to zero before use.
179 */
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180#define LTTNG_EVENT_CONTEXT_PADDING1 16
181#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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182struct lttng_event_context {
183 enum lttng_event_context_type ctx;
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184 char padding[LTTNG_EVENT_CONTEXT_PADDING1];
185
d65106b1 186 union {
7d29a247 187 struct lttng_event_perf_counter_ctx perf_counter;
8d326ab9 188 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
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189 } u;
190};
191
b7384347 192/*
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193 * Event probe.
194 *
195 * Either addr is used or symbol_name and offset.
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196 *
197 * The structures should be initialized to zero before use.
57167058 198 */
8d326ab9 199#define LTTNG_EVENT_PROBE_PADDING1 16
7d29a247 200struct lttng_event_probe_attr {
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201 uint64_t addr;
202
203 uint64_t offset;
204 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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205
206 char padding[LTTNG_EVENT_PROBE_PADDING1];
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207};
208
b7384347 209/*
f3ed775e 210 * Function tracer
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211 *
212 * The structures should be initialized to zero before use.
f3ed775e 213 */
8d326ab9 214#define LTTNG_EVENT_FUNCTION_PADDING1 16
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215struct lttng_event_function_attr {
216 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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217
218 char padding[LTTNG_EVENT_FUNCTION_PADDING1];
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219};
220
221/*
222 * Generic lttng event
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223 *
224 * The structures should be initialized to zero before use.
f3ed775e 225 */
fceb65df 226#define LTTNG_EVENT_PADDING1 15
8d326ab9 227#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 228struct lttng_event {
0cda4f28 229 enum lttng_event_type type;
f3ed775e 230 char name[LTTNG_SYMBOL_NAME_LEN];
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231
232 enum lttng_loglevel_type loglevel_type;
8005f29a 233 int loglevel;
0cda4f28 234
35dc4d62 235 int32_t enabled; /* Does not apply: -1 */
b551a063 236 pid_t pid;
fceb65df 237 unsigned char filter; /* filter enabled ? */
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238
239 char padding[LTTNG_EVENT_PADDING1];
240
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241 /* Per event type configuration */
242 union {
7d29a247 243 struct lttng_event_probe_attr probe;
f3ed775e 244 struct lttng_event_function_attr ftrace;
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245
246 char padding[LTTNG_EVENT_PADDING2];
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247 } attr;
248};
249
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250enum lttng_event_field_type {
251 LTTNG_EVENT_FIELD_OTHER = 0,
252 LTTNG_EVENT_FIELD_INTEGER = 1,
253 LTTNG_EVENT_FIELD_ENUM = 2,
254 LTTNG_EVENT_FIELD_FLOAT = 3,
255 LTTNG_EVENT_FIELD_STRING = 4,
256};
257
258#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
259struct lttng_event_field {
260 char field_name[LTTNG_SYMBOL_NAME_LEN];
261 enum lttng_event_field_type type;
262 char padding[LTTNG_EVENT_FIELD_PADDING];
263 struct lttng_event event;
264};
265
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266/*
267 * Tracer channel attributes. For both kernel and user-space.
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268 *
269 * The structures should be initialized to zero before use.
e6ddca71 270 */
8d326ab9 271#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 272struct lttng_channel_attr {
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273 int overwrite; /* 1: overwrite, 0: discard */
274 uint64_t subbuf_size; /* bytes */
275 uint64_t num_subbuf; /* power of 2 */
276 unsigned int switch_timer_interval; /* usec */
277 unsigned int read_timer_interval; /* usec */
f05b5f07 278 enum lttng_event_output output; /* splice, mmap */
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279
280 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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281};
282
283/*
e6ddca71 284 * Channel information structure. For both kernel and user-space.
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285 *
286 * The structures should be initialized to zero before use.
1657e9bb 287 */
8d326ab9 288#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 289struct lttng_channel {
045e5491 290 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 291 uint32_t enabled;
e6ddca71 292 struct lttng_channel_attr attr;
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293
294 char padding[LTTNG_CHANNEL_PADDING1];
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295};
296
8d326ab9 297#define LTTNG_CALIBRATE_PADDING1 16
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298struct lttng_calibrate {
299 enum lttng_calibrate_type type;
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300
301 char padding[LTTNG_CALIBRATE_PADDING1];
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302};
303
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304/*
305 * Basic session information.
306 *
307 * This is an 'output data' meaning that it only comes *from* the session
308 * daemon *to* the lttng client. It's basically a 'human' representation of
309 * tracing entities (here a session).
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310 *
311 * The structures should be initialized to zero before use.
e6ddca71 312 */
8d326ab9 313#define LTTNG_SESSION_PADDING1 16
e6ddca71 314struct lttng_session {
f3ed775e 315 char name[NAME_MAX];
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316 /* The path where traces are written */
317 char path[PATH_MAX];
464dd62d 318 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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319
320 char padding[LTTNG_SESSION_PADDING1];
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321};
322
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323/*
324 * Handle used as a context for commands.
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325 *
326 * The structures should be initialized to zero before use.
cd80958d 327 */
8d326ab9 328#define LTTNG_HANDLE_PADDING1 16
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329struct lttng_handle {
330 char session_name[NAME_MAX];
331 struct lttng_domain domain;
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332
333 char padding[LTTNG_HANDLE_PADDING1];
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334};
335
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336/*
337 * Public LTTng control API
338 *
1e46a50f 339 * For functions having an lttng domain type as parameter, if a bad value is
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340 * given, NO default is applied and an error is returned.
341 *
342 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 343 * array (in bytes).
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344 *
345 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 346 * code which can be humanly interpreted with lttng_strerror(err).
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347 *
348 * Exceptions to this are noted below.
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349 */
350
b7384347 351/*
1e46a50f 352 * Create a handle used as a context for every request made to the library.
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353 *
354 * This handle contains the session name and lttng domain on which the command
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355 * will be executed.
356 * The returned pointer will be NULL in case of malloc() error.
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357 */
358extern struct lttng_handle *lttng_create_handle(const char *session_name,
359 struct lttng_domain *domain);
360
361/*
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362 * Destroy a handle. This will simply free(3) the data pointer returned by
363 * lttng_create_handle(), rendering it unusable.
b7384347 364 */
cd80958d 365extern void lttng_destroy_handle(struct lttng_handle *handle);
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366
367/*
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368 * Create a tracing session using a name and an optional URL.
369 *
370 * If _url_ is NULL, no consumer is created for the session.
00e2e675 371 */
a4b92340 372extern int lttng_create_session(const char *name, const char *url);
00e2e675 373
7d29a247 374/*
1e46a50f 375 * Destroy a tracing session.
7d29a247 376 *
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377 * The session will not be usable anymore, tracing will be stopped for all
378 * registered traces, and the tracing buffers will be flushed.
7d29a247 379 */
843f5df9 380extern int lttng_destroy_session(const char *name);
f3ed775e 381
e6ddca71 382/*
1e46a50f 383 * List all the tracing sessions.
7d29a247 384 *
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385 * Return the size (number of entries) of the "lttng_session" array. Caller
386 * must free(3).
e6ddca71 387 */
ca95a216 388extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 389
9f19cc17 390/*
1e46a50f 391 * List the registered domain(s) of a session.
9f19cc17 392 *
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393 * Return the size (number of entries) of the "lttng_domain" array. Caller
394 * must free(3).
9f19cc17 395 */
330be774 396extern int lttng_list_domains(const char *session_name,
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397 struct lttng_domain **domains);
398
399/*
1e46a50f 400 * List the channel(s) of a session.
9f19cc17 401 *
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402 * Return the size (number of entries) of the "lttng_channel" array. Caller
403 * must free(3).
9f19cc17 404 */
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405extern int lttng_list_channels(struct lttng_handle *handle,
406 struct lttng_channel **channels);
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407
408/*
1e46a50f 409 * List the event(s) of a session channel.
9f19cc17 410 *
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411 * Return the size (number of entries) of the "lttng_event" array.
412 * Caller must free(3).
9f19cc17 413 */
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414extern int lttng_list_events(struct lttng_handle *handle,
415 const char *channel_name, struct lttng_event **events);
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416
417/*
1e46a50f 418 * List the available tracepoints of a specific lttng domain.
9f19cc17 419 *
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420 * Return the size (number of entries) of the "lttng_event" array.
421 * Caller must free(3).
9f19cc17 422 */
cd80958d 423extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 424 struct lttng_event **events);
9f19cc17 425
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426/*
427 * List the available tracepoints fields of a specific lttng domain.
428 *
429 * Return the size (number of entries) of the "lttng_event_field" array.
430 * Caller must free(3).
431 */
432extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
433 struct lttng_event_field **fields);
434
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435/*
436 * Check if a session daemon is alive.
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437 *
438 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 439 */
947308c4 440extern int lttng_session_daemon_alive(void);
f3ed775e 441
7d29a247 442/*
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443 * Set the tracing group for the *current* flow of execution.
444 *
445 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 446 */
b7384347 447extern int lttng_set_tracing_group(const char *name);
f3ed775e 448
7d29a247 449/*
1e46a50f 450 * Return a human-readable error message for an lttng-tools error code.
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451 *
452 * Parameter MUST be a negative value or else you'll get a generic message.
453 */
9a745bc7 454extern const char *lttng_strerror(int code);
b7384347 455
d9800920 456/*
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457 * This call registers an "outside consumer" for a session and an lttng domain.
458 * No consumer will be spawned and all fds/commands will go through the socket
459 * path given (socket_path).
d9800920 460 *
3bd1e081 461 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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462 * command socket. The error socket is not supported yet for roaming consumers.
463 */
464extern int lttng_register_consumer(struct lttng_handle *handle,
465 const char *socket_path);
466
7d29a247 467/*
1e46a50f 468 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 469 */
6a4f824d 470extern int lttng_start_tracing(const char *session_name);
f3ed775e 471
7d29a247 472/*
1e46a50f 473 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 474 */
6a4f824d 475extern int lttng_stop_tracing(const char *session_name);
f3ed775e 476
b7384347 477/*
1e46a50f 478 * Add context to event(s) for a specific channel (or for all).
7d29a247 479 *
1e46a50f 480 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 481 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 482 * If both are NULL, the context is applied to all events of all channels.
b7384347 483 */
cd80958d 484extern int lttng_add_context(struct lttng_handle *handle,
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485 struct lttng_event_context *ctx, const char *event_name,
486 const char *channel_name);
f3ed775e 487
7d29a247 488/*
c8f61fc6 489 * Create or enable an event (or events) for a channel.
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490 *
491 * If the event you are trying to enable does not exist, it will be created,
492 * else it is enabled.
1e46a50f 493 * If event_name is NULL, all events are enabled.
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494 * If channel_name is NULL, the default channel is used (channel0).
495 */
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496extern int lttng_enable_event(struct lttng_handle *handle,
497 struct lttng_event *ev, const char *channel_name);
f3ed775e 498
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499/*
500 * Apply a filter expression to an event.
501 *
502 * If event_name is NULL, the filter is applied to all events of the channel.
503 * If channel_name is NULL, a lookup of the event's channel is done.
504 * If both are NULL, the filter is applied to all events of all channels.
505 */
506extern int lttng_set_event_filter(struct lttng_handle *handle,
507 const char *event_name,
508 const char *channel_name,
509 const char *filter_expression);
7d29a247 510/*
c8f61fc6 511 * Create or enable a channel.
1e46a50f 512 * The channel name cannot be NULL.
7d29a247 513 */
cd80958d 514extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 515 struct lttng_channel *chan);
f3ed775e 516
7d29a247 517/*
c8f61fc6 518 * Disable event(s) of a channel and domain.
7d29a247 519 *
1e46a50f 520 * If event_name is NULL, all events are disabled.
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521 * If channel_name is NULL, the default channel is used (channel0).
522 */
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523extern int lttng_disable_event(struct lttng_handle *handle,
524 const char *name, const char *channel_name);
fac6795d 525
1df4dedd 526/*
c8f61fc6 527 * Disable channel.
7d29a247 528 *
1e46a50f 529 * The channel name cannot be NULL.
1df4dedd 530 */
cd80958d 531extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 532 const char *name);
1df4dedd 533
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534/*
535 * Calibrate LTTng overhead.
536 */
cd80958d 537extern int lttng_calibrate(struct lttng_handle *handle,
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538 struct lttng_calibrate *calibrate);
539
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540/*
541 * Set the default channel attributes for a specific domain and an allocated
542 * lttng_channel_attr pointer.
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543 *
544 * If either or both of the arguments are NULL, nothing happens.
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545 */
546extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
547 struct lttng_channel_attr *attr);
548
00e2e675 549/*
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550 * Set URL for a consumer for a session and domain.
551 *
552 * Both data and control URL must be defined. If both URLs are the same, only
553 * the control URL is used even for network streaming.
00e2e675 554 *
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555 * Default port are 5342 and 5343 respectively for control and data which uses
556 * the TCP protocol.
00e2e675 557 */
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558extern int lttng_set_consumer_url(struct lttng_handle *handle,
559 const char *control_url, const char *data_url);
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560
561/*
562 * Enable the consumer for a session and domain.
563 */
564extern int lttng_enable_consumer(struct lttng_handle *handle);
565
566/*
567 * Disable consumer for a session and domain.
568 */
569extern int lttng_disable_consumer(struct lttng_handle *handle);
570
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571/*
572 * Check session daemon health for a specific component.
573 *
574 * Return 0 if health is OK or 1 if BAD. A returned value of -1 indicate that
575 * the control library was not able to connect to the session daemon health
576 * socket.
577 *
578 * Any other positive value is an lttcomm error which can be translate with
579 * lttng_strerror().
580 */
581extern int lttng_health_check(enum lttng_health_component c);
582
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583#ifdef __cplusplus
584}
585#endif
586
73db5be4 587#endif /* LTTNG_H */
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