Fix: Change the type of enabled in lttng_event to a signed int
[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 {
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
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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/*
128 * The structures should be initialized to zero before use.
129 */
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130#define LTTNG_DOMAIN_PADDING1 16
131#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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132struct lttng_domain {
133 enum lttng_domain_type type;
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134 char padding[LTTNG_DOMAIN_PADDING1];
135
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136 union {
137 pid_t pid;
138 char exec_name[NAME_MAX];
8d326ab9 139 char padding[LTTNG_DOMAIN_PADDING2];
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140 } attr;
141};
142
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143/*
144 * Perf counter attributes
145 *
146 * The structures should be initialized to zero before use.
147 */
8d326ab9 148#define LTTNG_PERF_EVENT_PADDING1 16
7d29a247 149struct lttng_event_perf_counter_ctx {
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150 uint32_t type;
151 uint64_t config;
152 char name[LTTNG_SYMBOL_NAME_LEN];
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153
154 char padding[LTTNG_PERF_EVENT_PADDING1];
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155};
156
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157/*
158 * Event/channel context
159 *
160 * The structures should be initialized to zero before use.
161 */
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162#define LTTNG_EVENT_CONTEXT_PADDING1 16
163#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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164struct lttng_event_context {
165 enum lttng_event_context_type ctx;
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166 char padding[LTTNG_EVENT_CONTEXT_PADDING1];
167
d65106b1 168 union {
7d29a247 169 struct lttng_event_perf_counter_ctx perf_counter;
8d326ab9 170 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
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171 } u;
172};
173
b7384347 174/*
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175 * Event probe.
176 *
177 * Either addr is used or symbol_name and offset.
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178 *
179 * The structures should be initialized to zero before use.
57167058 180 */
8d326ab9 181#define LTTNG_EVENT_PROBE_PADDING1 16
7d29a247 182struct lttng_event_probe_attr {
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183 uint64_t addr;
184
185 uint64_t offset;
186 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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187
188 char padding[LTTNG_EVENT_PROBE_PADDING1];
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189};
190
b7384347 191/*
f3ed775e 192 * Function tracer
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193 *
194 * The structures should be initialized to zero before use.
f3ed775e 195 */
8d326ab9 196#define LTTNG_EVENT_FUNCTION_PADDING1 16
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197struct lttng_event_function_attr {
198 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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199
200 char padding[LTTNG_EVENT_FUNCTION_PADDING1];
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201};
202
203/*
204 * Generic lttng event
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205 *
206 * The structures should be initialized to zero before use.
f3ed775e 207 */
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208#define LTTNG_EVENT_PADDING1 16
209#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 210struct lttng_event {
0cda4f28 211 enum lttng_event_type type;
f3ed775e 212 char name[LTTNG_SYMBOL_NAME_LEN];
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213
214 enum lttng_loglevel_type loglevel_type;
8005f29a 215 int loglevel;
0cda4f28 216
35dc4d62 217 int32_t enabled; /* Does not apply: -1 */
b551a063 218 pid_t pid;
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219
220 char padding[LTTNG_EVENT_PADDING1];
221
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222 /* Per event type configuration */
223 union {
7d29a247 224 struct lttng_event_probe_attr probe;
f3ed775e 225 struct lttng_event_function_attr ftrace;
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226
227 char padding[LTTNG_EVENT_PADDING2];
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228 } attr;
229};
230
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231enum lttng_event_field_type {
232 LTTNG_EVENT_FIELD_OTHER = 0,
233 LTTNG_EVENT_FIELD_INTEGER = 1,
234 LTTNG_EVENT_FIELD_ENUM = 2,
235 LTTNG_EVENT_FIELD_FLOAT = 3,
236 LTTNG_EVENT_FIELD_STRING = 4,
237};
238
239#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
240struct lttng_event_field {
241 char field_name[LTTNG_SYMBOL_NAME_LEN];
242 enum lttng_event_field_type type;
243 char padding[LTTNG_EVENT_FIELD_PADDING];
244 struct lttng_event event;
245};
246
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247/*
248 * Tracer channel attributes. For both kernel and user-space.
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249 *
250 * The structures should be initialized to zero before use.
e6ddca71 251 */
8d326ab9 252#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 253struct lttng_channel_attr {
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254 int overwrite; /* 1: overwrite, 0: discard */
255 uint64_t subbuf_size; /* bytes */
256 uint64_t num_subbuf; /* power of 2 */
257 unsigned int switch_timer_interval; /* usec */
258 unsigned int read_timer_interval; /* usec */
f05b5f07 259 enum lttng_event_output output; /* splice, mmap */
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260
261 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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262};
263
264/*
e6ddca71 265 * Channel information structure. For both kernel and user-space.
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266 *
267 * The structures should be initialized to zero before use.
1657e9bb 268 */
8d326ab9 269#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 270struct lttng_channel {
045e5491 271 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 272 uint32_t enabled;
e6ddca71 273 struct lttng_channel_attr attr;
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274
275 char padding[LTTNG_CHANNEL_PADDING1];
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276};
277
8d326ab9 278#define LTTNG_CALIBRATE_PADDING1 16
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279struct lttng_calibrate {
280 enum lttng_calibrate_type type;
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281
282 char padding[LTTNG_CALIBRATE_PADDING1];
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283};
284
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285/*
286 * Basic session information.
287 *
288 * This is an 'output data' meaning that it only comes *from* the session
289 * daemon *to* the lttng client. It's basically a 'human' representation of
290 * tracing entities (here a session).
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291 *
292 * The structures should be initialized to zero before use.
e6ddca71 293 */
8d326ab9 294#define LTTNG_SESSION_PADDING1 16
e6ddca71 295struct lttng_session {
f3ed775e 296 char name[NAME_MAX];
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297 /* The path where traces are written */
298 char path[PATH_MAX];
464dd62d 299 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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300
301 char padding[LTTNG_SESSION_PADDING1];
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302};
303
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304/*
305 * Handle used as a context for commands.
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306 *
307 * The structures should be initialized to zero before use.
cd80958d 308 */
8d326ab9 309#define LTTNG_HANDLE_PADDING1 16
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310struct lttng_handle {
311 char session_name[NAME_MAX];
312 struct lttng_domain domain;
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313
314 char padding[LTTNG_HANDLE_PADDING1];
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315};
316
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317/*
318 * Public LTTng control API
319 *
1e46a50f 320 * For functions having an lttng domain type as parameter, if a bad value is
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321 * given, NO default is applied and an error is returned.
322 *
323 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 324 * array (in bytes).
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325 *
326 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 327 * code which can be humanly interpreted with lttng_strerror(err).
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328 *
329 * Exceptions to this are noted below.
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330 */
331
b7384347 332/*
1e46a50f 333 * Create a handle used as a context for every request made to the library.
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334 *
335 * This handle contains the session name and lttng domain on which the command
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336 * will be executed.
337 * The returned pointer will be NULL in case of malloc() error.
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338 */
339extern struct lttng_handle *lttng_create_handle(const char *session_name,
340 struct lttng_domain *domain);
341
342/*
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343 * Destroy a handle. This will simply free(3) the data pointer returned by
344 * lttng_create_handle(), rendering it unusable.
b7384347 345 */
cd80958d 346extern void lttng_destroy_handle(struct lttng_handle *handle);
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347
348/*
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349 * Create a tracing session using a name and a path where the trace will be
350 * written.
7d29a247 351 */
38057ed1 352extern int lttng_create_session(const char *name, const char *path);
f3ed775e 353
7d29a247 354/*
1e46a50f 355 * Destroy a tracing session.
7d29a247 356 *
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357 * The session will not be usable anymore, tracing will be stopped for all
358 * registered traces, and the tracing buffers will be flushed.
7d29a247 359 */
843f5df9 360extern int lttng_destroy_session(const char *name);
f3ed775e 361
e6ddca71 362/*
1e46a50f 363 * List all the tracing sessions.
7d29a247 364 *
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365 * Return the size (number of entries) of the "lttng_session" array. Caller
366 * must free(3).
e6ddca71 367 */
ca95a216 368extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 369
9f19cc17 370/*
1e46a50f 371 * List the registered domain(s) of a session.
9f19cc17 372 *
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373 * Return the size (number of entries) of the "lttng_domain" array. Caller
374 * must free(3).
9f19cc17 375 */
330be774 376extern int lttng_list_domains(const char *session_name,
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377 struct lttng_domain **domains);
378
379/*
1e46a50f 380 * List the channel(s) of a session.
9f19cc17 381 *
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382 * Return the size (number of entries) of the "lttng_channel" array. Caller
383 * must free(3).
9f19cc17 384 */
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385extern int lttng_list_channels(struct lttng_handle *handle,
386 struct lttng_channel **channels);
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387
388/*
1e46a50f 389 * List the event(s) of a session channel.
9f19cc17 390 *
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391 * Return the size (number of entries) of the "lttng_event" array.
392 * Caller must free(3).
9f19cc17 393 */
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394extern int lttng_list_events(struct lttng_handle *handle,
395 const char *channel_name, struct lttng_event **events);
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396
397/*
1e46a50f 398 * List the available tracepoints of a specific lttng domain.
9f19cc17 399 *
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400 * Return the size (number of entries) of the "lttng_event" array.
401 * Caller must free(3).
9f19cc17 402 */
cd80958d 403extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 404 struct lttng_event **events);
9f19cc17 405
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406/*
407 * List the available tracepoints fields of a specific lttng domain.
408 *
409 * Return the size (number of entries) of the "lttng_event_field" array.
410 * Caller must free(3).
411 */
412extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
413 struct lttng_event_field **fields);
414
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415/*
416 * Check if a session daemon is alive.
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417 *
418 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 419 */
947308c4 420extern int lttng_session_daemon_alive(void);
f3ed775e 421
7d29a247 422/*
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423 * Set the tracing group for the *current* flow of execution.
424 *
425 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 426 */
b7384347 427extern int lttng_set_tracing_group(const char *name);
f3ed775e 428
7d29a247 429/*
1e46a50f 430 * Return a human-readable error message for an lttng-tools error code.
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431 *
432 * Parameter MUST be a negative value or else you'll get a generic message.
433 */
9a745bc7 434extern const char *lttng_strerror(int code);
b7384347 435
d9800920 436/*
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437 * This call registers an "outside consumer" for a session and an lttng domain.
438 * No consumer will be spawned and all fds/commands will go through the socket
439 * path given (socket_path).
d9800920 440 *
3bd1e081 441 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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442 * command socket. The error socket is not supported yet for roaming consumers.
443 */
444extern int lttng_register_consumer(struct lttng_handle *handle,
445 const char *socket_path);
446
7d29a247 447/*
1e46a50f 448 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 449 */
6a4f824d 450extern int lttng_start_tracing(const char *session_name);
f3ed775e 451
7d29a247 452/*
1e46a50f 453 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 454 */
6a4f824d 455extern int lttng_stop_tracing(const char *session_name);
f3ed775e 456
b7384347 457/*
1e46a50f 458 * Add context to event(s) for a specific channel (or for all).
7d29a247 459 *
1e46a50f 460 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 461 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 462 * If both are NULL, the context is applied to all events of all channels.
b7384347 463 */
cd80958d 464extern int lttng_add_context(struct lttng_handle *handle,
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465 struct lttng_event_context *ctx, const char *event_name,
466 const char *channel_name);
f3ed775e 467
7d29a247 468/*
c8f61fc6 469 * Create or enable an event (or events) for a channel.
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470 *
471 * If the event you are trying to enable does not exist, it will be created,
472 * else it is enabled.
1e46a50f 473 * If event_name is NULL, all events are enabled.
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474 * If channel_name is NULL, the default channel is used (channel0).
475 */
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476extern int lttng_enable_event(struct lttng_handle *handle,
477 struct lttng_event *ev, const char *channel_name);
f3ed775e 478
7d29a247 479/*
c8f61fc6 480 * Create or enable a channel.
1e46a50f 481 * The channel name cannot be NULL.
7d29a247 482 */
cd80958d 483extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 484 struct lttng_channel *chan);
f3ed775e 485
7d29a247 486/*
c8f61fc6 487 * Disable event(s) of a channel and domain.
7d29a247 488 *
1e46a50f 489 * If event_name is NULL, all events are disabled.
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490 * If channel_name is NULL, the default channel is used (channel0).
491 */
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492extern int lttng_disable_event(struct lttng_handle *handle,
493 const char *name, const char *channel_name);
fac6795d 494
1df4dedd 495/*
c8f61fc6 496 * Disable channel.
7d29a247 497 *
1e46a50f 498 * The channel name cannot be NULL.
1df4dedd 499 */
cd80958d 500extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 501 const char *name);
1df4dedd 502
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503/*
504 * Calibrate LTTng overhead.
505 */
cd80958d 506extern int lttng_calibrate(struct lttng_handle *handle,
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507 struct lttng_calibrate *calibrate);
508
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509/*
510 * Set the default channel attributes for a specific domain and an allocated
511 * lttng_channel_attr pointer.
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512 *
513 * If either or both of the arguments are NULL, nothing happens.
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514 */
515extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
516 struct lttng_channel_attr *attr);
517
b7384347 518#endif /* _LTTNG_H */
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