Implement filter expression to bytecode compiler in liblttng-ctl
[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>
3a5713da 26#include <netinet/in.h>
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27#include <stdint.h>
28#include <sys/types.h>
57167058 29
b7384347 30/*
e6ddca71 31 * Event symbol length. Copied from LTTng kernel ABI.
1657e9bb 32 */
8d326ab9 33#define LTTNG_SYMBOL_NAME_LEN 256
f3ed775e 34
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35/*
36 * Maximum length of a domain name. This is the limit for the total length of a
37 * domain name specified by the RFC 1035 (https://www.ietf.org/rfc/rfc1035.txt)
38 */
39#define LTTNG_MAX_DNNAME 255
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,
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128};
129
d0254c7c 130enum lttng_calibrate_type {
d78d6610 131 LTTNG_CALIBRATE_FUNCTION = 0,
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132};
133
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134/* Destination type of lttng URI */
135enum lttng_dst_type {
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136 LTTNG_DST_IPV4 = 1,
137 LTTNG_DST_IPV6 = 2,
138 LTTNG_DST_PATH = 3,
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139};
140
141/* Type of lttng URI where it is a final destination or a hop */
142enum lttng_uri_type {
143 LTTNG_URI_DST, /* The URI is a final destination */
144 /*
145 * Hop are not supported yet but planned for a future release.
146 *
147 LTTNG_URI_HOP,
148 */
149};
150
151/* Communication stream type of a lttng URI */
152enum lttng_stream_type {
153 LTTNG_STREAM_CONTROL,
154 LTTNG_STREAM_DATA,
155};
156
157/*
158 * Protocol type of a lttng URI. The value 0 indicate that the proto_type field
159 * should be ignored.
160 */
161enum lttng_proto_type {
162 LTTNG_TCP = 1,
163 /*
164 * UDP protocol is not supported for now.
165 *
166 LTTNG_UDP = 2,
167 */
168};
169
170/*
171 * Structure representing an URI supported by lttng.
172 */
173#define LTTNG_URI_PADDING1_LEN 16
174#define LTTNG_URI_PADDING2_LEN LTTNG_SYMBOL_NAME_LEN + 32
175struct lttng_uri {
176 enum lttng_dst_type dtype;
177 enum lttng_uri_type utype;
178 enum lttng_stream_type stype;
179 enum lttng_proto_type proto;
180 in_port_t port;
181 char padding[LTTNG_URI_PADDING1_LEN];
00e2e675 182 char subdir[PATH_MAX];
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183 union {
184 char ipv4[INET_ADDRSTRLEN];
185 char ipv6[INET6_ADDRSTRLEN];
186 char path[PATH_MAX];
187 char padding[LTTNG_URI_PADDING2_LEN];
188 } dst;
189};
190
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191/*
192 * The structures should be initialized to zero before use.
193 */
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194#define LTTNG_DOMAIN_PADDING1 16
195#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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196struct lttng_domain {
197 enum lttng_domain_type type;
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198 char padding[LTTNG_DOMAIN_PADDING1];
199
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200 union {
201 pid_t pid;
202 char exec_name[NAME_MAX];
8d326ab9 203 char padding[LTTNG_DOMAIN_PADDING2];
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204 } attr;
205};
206
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207/*
208 * Perf counter attributes
209 *
210 * The structures should be initialized to zero before use.
211 */
8d326ab9 212#define LTTNG_PERF_EVENT_PADDING1 16
7d29a247 213struct lttng_event_perf_counter_ctx {
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214 uint32_t type;
215 uint64_t config;
216 char name[LTTNG_SYMBOL_NAME_LEN];
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217
218 char padding[LTTNG_PERF_EVENT_PADDING1];
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219};
220
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221/*
222 * Event/channel context
223 *
224 * The structures should be initialized to zero before use.
225 */
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226#define LTTNG_EVENT_CONTEXT_PADDING1 16
227#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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228struct lttng_event_context {
229 enum lttng_event_context_type ctx;
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230 char padding[LTTNG_EVENT_CONTEXT_PADDING1];
231
d65106b1 232 union {
7d29a247 233 struct lttng_event_perf_counter_ctx perf_counter;
8d326ab9 234 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
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235 } u;
236};
237
b7384347 238/*
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239 * Event probe.
240 *
241 * Either addr is used or symbol_name and offset.
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242 *
243 * The structures should be initialized to zero before use.
57167058 244 */
8d326ab9 245#define LTTNG_EVENT_PROBE_PADDING1 16
7d29a247 246struct lttng_event_probe_attr {
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247 uint64_t addr;
248
249 uint64_t offset;
250 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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251
252 char padding[LTTNG_EVENT_PROBE_PADDING1];
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253};
254
b7384347 255/*
f3ed775e 256 * Function tracer
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257 *
258 * The structures should be initialized to zero before use.
f3ed775e 259 */
8d326ab9 260#define LTTNG_EVENT_FUNCTION_PADDING1 16
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261struct lttng_event_function_attr {
262 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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263
264 char padding[LTTNG_EVENT_FUNCTION_PADDING1];
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265};
266
267/*
268 * Generic lttng event
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269 *
270 * The structures should be initialized to zero before use.
f3ed775e 271 */
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272#define LTTNG_EVENT_PADDING1 16
273#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 274struct lttng_event {
0cda4f28 275 enum lttng_event_type type;
f3ed775e 276 char name[LTTNG_SYMBOL_NAME_LEN];
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277
278 enum lttng_loglevel_type loglevel_type;
8005f29a 279 int loglevel;
0cda4f28 280
35dc4d62 281 int32_t enabled; /* Does not apply: -1 */
b551a063 282 pid_t pid;
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283
284 char padding[LTTNG_EVENT_PADDING1];
285
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286 /* Per event type configuration */
287 union {
7d29a247 288 struct lttng_event_probe_attr probe;
f3ed775e 289 struct lttng_event_function_attr ftrace;
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290
291 char padding[LTTNG_EVENT_PADDING2];
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292 } attr;
293};
294
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295enum lttng_event_field_type {
296 LTTNG_EVENT_FIELD_OTHER = 0,
297 LTTNG_EVENT_FIELD_INTEGER = 1,
298 LTTNG_EVENT_FIELD_ENUM = 2,
299 LTTNG_EVENT_FIELD_FLOAT = 3,
300 LTTNG_EVENT_FIELD_STRING = 4,
301};
302
303#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
304struct lttng_event_field {
305 char field_name[LTTNG_SYMBOL_NAME_LEN];
306 enum lttng_event_field_type type;
307 char padding[LTTNG_EVENT_FIELD_PADDING];
308 struct lttng_event event;
309};
310
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311/*
312 * Tracer channel attributes. For both kernel and user-space.
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313 *
314 * The structures should be initialized to zero before use.
e6ddca71 315 */
8d326ab9 316#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 317struct lttng_channel_attr {
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318 int overwrite; /* 1: overwrite, 0: discard */
319 uint64_t subbuf_size; /* bytes */
320 uint64_t num_subbuf; /* power of 2 */
321 unsigned int switch_timer_interval; /* usec */
322 unsigned int read_timer_interval; /* usec */
f05b5f07 323 enum lttng_event_output output; /* splice, mmap */
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324
325 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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326};
327
328/*
e6ddca71 329 * Channel information structure. For both kernel and user-space.
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330 *
331 * The structures should be initialized to zero before use.
1657e9bb 332 */
8d326ab9 333#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 334struct lttng_channel {
045e5491 335 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 336 uint32_t enabled;
e6ddca71 337 struct lttng_channel_attr attr;
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338
339 char padding[LTTNG_CHANNEL_PADDING1];
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340};
341
8d326ab9 342#define LTTNG_CALIBRATE_PADDING1 16
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343struct lttng_calibrate {
344 enum lttng_calibrate_type type;
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345
346 char padding[LTTNG_CALIBRATE_PADDING1];
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347};
348
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349/*
350 * Basic session information.
351 *
352 * This is an 'output data' meaning that it only comes *from* the session
353 * daemon *to* the lttng client. It's basically a 'human' representation of
354 * tracing entities (here a session).
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355 *
356 * The structures should be initialized to zero before use.
e6ddca71 357 */
8d326ab9 358#define LTTNG_SESSION_PADDING1 16
e6ddca71 359struct lttng_session {
f3ed775e 360 char name[NAME_MAX];
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361 /* The path where traces are written */
362 char path[PATH_MAX];
464dd62d 363 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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364
365 char padding[LTTNG_SESSION_PADDING1];
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366};
367
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368/*
369 * Handle used as a context for commands.
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370 *
371 * The structures should be initialized to zero before use.
cd80958d 372 */
8d326ab9 373#define LTTNG_HANDLE_PADDING1 16
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374struct lttng_handle {
375 char session_name[NAME_MAX];
376 struct lttng_domain domain;
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377
378 char padding[LTTNG_HANDLE_PADDING1];
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379};
380
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381/*
382 * Public LTTng control API
383 *
1e46a50f 384 * For functions having an lttng domain type as parameter, if a bad value is
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385 * given, NO default is applied and an error is returned.
386 *
387 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 388 * array (in bytes).
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389 *
390 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 391 * code which can be humanly interpreted with lttng_strerror(err).
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392 *
393 * Exceptions to this are noted below.
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394 */
395
b7384347 396/*
1e46a50f 397 * Create a handle used as a context for every request made to the library.
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398 *
399 * This handle contains the session name and lttng domain on which the command
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400 * will be executed.
401 * The returned pointer will be NULL in case of malloc() error.
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402 */
403extern struct lttng_handle *lttng_create_handle(const char *session_name,
404 struct lttng_domain *domain);
405
406/*
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407 * Destroy a handle. This will simply free(3) the data pointer returned by
408 * lttng_create_handle(), rendering it unusable.
b7384347 409 */
cd80958d 410extern void lttng_destroy_handle(struct lttng_handle *handle);
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411
412/*
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413 * Create a tracing session using a name and a path where the trace will be
414 * written.
7d29a247 415 */
38057ed1 416extern int lttng_create_session(const char *name, const char *path);
f3ed775e 417
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418/*
419 * Create a tracing sessioin using a name, URIs and a consumer enable flag.
420 * The control URI is mandatory for consumer local or network.
421 */
422extern int lttng_create_session_uri(const char *name,
423 struct lttng_uri *ctrl_uri, struct lttng_uri *data_uri,
424 unsigned int enable_consumer);
425
7d29a247 426/*
1e46a50f 427 * Destroy a tracing session.
7d29a247 428 *
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429 * The session will not be usable anymore, tracing will be stopped for all
430 * registered traces, and the tracing buffers will be flushed.
7d29a247 431 */
843f5df9 432extern int lttng_destroy_session(const char *name);
f3ed775e 433
e6ddca71 434/*
1e46a50f 435 * List all the tracing sessions.
7d29a247 436 *
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437 * Return the size (number of entries) of the "lttng_session" array. Caller
438 * must free(3).
e6ddca71 439 */
ca95a216 440extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 441
9f19cc17 442/*
1e46a50f 443 * List the registered domain(s) of a session.
9f19cc17 444 *
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445 * Return the size (number of entries) of the "lttng_domain" array. Caller
446 * must free(3).
9f19cc17 447 */
330be774 448extern int lttng_list_domains(const char *session_name,
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449 struct lttng_domain **domains);
450
451/*
1e46a50f 452 * List the channel(s) of a session.
9f19cc17 453 *
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454 * Return the size (number of entries) of the "lttng_channel" array. Caller
455 * must free(3).
9f19cc17 456 */
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457extern int lttng_list_channels(struct lttng_handle *handle,
458 struct lttng_channel **channels);
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459
460/*
1e46a50f 461 * List the event(s) of a session channel.
9f19cc17 462 *
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463 * Return the size (number of entries) of the "lttng_event" array.
464 * Caller must free(3).
9f19cc17 465 */
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466extern int lttng_list_events(struct lttng_handle *handle,
467 const char *channel_name, struct lttng_event **events);
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468
469/*
1e46a50f 470 * List the available tracepoints of a specific lttng domain.
9f19cc17 471 *
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472 * Return the size (number of entries) of the "lttng_event" array.
473 * Caller must free(3).
9f19cc17 474 */
cd80958d 475extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 476 struct lttng_event **events);
9f19cc17 477
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478/*
479 * List the available tracepoints fields of a specific lttng domain.
480 *
481 * Return the size (number of entries) of the "lttng_event_field" array.
482 * Caller must free(3).
483 */
484extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
485 struct lttng_event_field **fields);
486
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487/*
488 * Check if a session daemon is alive.
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489 *
490 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 491 */
947308c4 492extern int lttng_session_daemon_alive(void);
f3ed775e 493
7d29a247 494/*
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495 * Set the tracing group for the *current* flow of execution.
496 *
497 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 498 */
b7384347 499extern int lttng_set_tracing_group(const char *name);
f3ed775e 500
7d29a247 501/*
1e46a50f 502 * Return a human-readable error message for an lttng-tools error code.
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503 *
504 * Parameter MUST be a negative value or else you'll get a generic message.
505 */
9a745bc7 506extern const char *lttng_strerror(int code);
b7384347 507
d9800920 508/*
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509 * This call registers an "outside consumer" for a session and an lttng domain.
510 * No consumer will be spawned and all fds/commands will go through the socket
511 * path given (socket_path).
d9800920 512 *
3bd1e081 513 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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514 * command socket. The error socket is not supported yet for roaming consumers.
515 */
516extern int lttng_register_consumer(struct lttng_handle *handle,
517 const char *socket_path);
518
7d29a247 519/*
1e46a50f 520 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 521 */
6a4f824d 522extern int lttng_start_tracing(const char *session_name);
f3ed775e 523
7d29a247 524/*
1e46a50f 525 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 526 */
6a4f824d 527extern int lttng_stop_tracing(const char *session_name);
f3ed775e 528
b7384347 529/*
1e46a50f 530 * Add context to event(s) for a specific channel (or for all).
7d29a247 531 *
1e46a50f 532 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 533 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 534 * If both are NULL, the context is applied to all events of all channels.
b7384347 535 */
cd80958d 536extern int lttng_add_context(struct lttng_handle *handle,
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537 struct lttng_event_context *ctx, const char *event_name,
538 const char *channel_name);
f3ed775e 539
7d29a247 540/*
c8f61fc6 541 * Create or enable an event (or events) for a channel.
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542 *
543 * If the event you are trying to enable does not exist, it will be created,
544 * else it is enabled.
1e46a50f 545 * If event_name is NULL, all events are enabled.
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546 * If channel_name is NULL, the default channel is used (channel0).
547 */
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548extern int lttng_enable_event(struct lttng_handle *handle,
549 struct lttng_event *ev, const char *channel_name);
f3ed775e 550
7d29a247 551/*
c8f61fc6 552 * Create or enable a channel.
1e46a50f 553 * The channel name cannot be NULL.
7d29a247 554 */
cd80958d 555extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 556 struct lttng_channel *chan);
f3ed775e 557
7d29a247 558/*
c8f61fc6 559 * Disable event(s) of a channel and domain.
7d29a247 560 *
1e46a50f 561 * If event_name is NULL, all events are disabled.
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562 * If channel_name is NULL, the default channel is used (channel0).
563 */
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564extern int lttng_disable_event(struct lttng_handle *handle,
565 const char *name, const char *channel_name);
fac6795d 566
1df4dedd 567/*
c8f61fc6 568 * Disable channel.
7d29a247 569 *
1e46a50f 570 * The channel name cannot be NULL.
1df4dedd 571 */
cd80958d 572extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 573 const char *name);
1df4dedd 574
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575/*
576 * Calibrate LTTng overhead.
577 */
cd80958d 578extern int lttng_calibrate(struct lttng_handle *handle,
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579 struct lttng_calibrate *calibrate);
580
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581/*
582 * Set the default channel attributes for a specific domain and an allocated
583 * lttng_channel_attr pointer.
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584 *
585 * If either or both of the arguments are NULL, nothing happens.
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586 */
587extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
588 struct lttng_channel_attr *attr);
589
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590/*
591 * Set URI for a consumer for a session and domain.
592 *
593 * For network streaming, both data and control stream type MUST be defined
594 * with a specific URIs. Default port are 5342 and 5343 respectively for
595 * control and data which uses the TCP protocol.
596 */
597extern int lttng_set_consumer_uri(struct lttng_handle *handle,
598 struct lttng_uri *uri);
599
600/*
601 * Enable the consumer for a session and domain.
602 */
603extern int lttng_enable_consumer(struct lttng_handle *handle);
604
605/*
606 * Disable consumer for a session and domain.
607 */
608extern int lttng_disable_consumer(struct lttng_handle *handle);
609
b7384347 610#endif /* _LTTNG_H */
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