Initial import of the new binary lttng-relayd
[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 {
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,
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 {
136 LTTNG_DST_IPV4, /* IPv4 protocol */
137 LTTNG_DST_IPV6, /* IPv6 protocol */
138 LTTNG_DST_PATH, /* Local file system */
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];
182 union {
183 char ipv4[INET_ADDRSTRLEN];
184 char ipv6[INET6_ADDRSTRLEN];
185 char path[PATH_MAX];
186 char padding[LTTNG_URI_PADDING2_LEN];
187 } dst;
188};
189
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190/*
191 * The structures should be initialized to zero before use.
192 */
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193#define LTTNG_DOMAIN_PADDING1 16
194#define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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195struct lttng_domain {
196 enum lttng_domain_type type;
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197 char padding[LTTNG_DOMAIN_PADDING1];
198
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199 union {
200 pid_t pid;
201 char exec_name[NAME_MAX];
8d326ab9 202 char padding[LTTNG_DOMAIN_PADDING2];
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203 } attr;
204};
205
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206/*
207 * Perf counter attributes
208 *
209 * The structures should be initialized to zero before use.
210 */
8d326ab9 211#define LTTNG_PERF_EVENT_PADDING1 16
7d29a247 212struct lttng_event_perf_counter_ctx {
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213 uint32_t type;
214 uint64_t config;
215 char name[LTTNG_SYMBOL_NAME_LEN];
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216
217 char padding[LTTNG_PERF_EVENT_PADDING1];
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218};
219
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220/*
221 * Event/channel context
222 *
223 * The structures should be initialized to zero before use.
224 */
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225#define LTTNG_EVENT_CONTEXT_PADDING1 16
226#define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
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227struct lttng_event_context {
228 enum lttng_event_context_type ctx;
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229 char padding[LTTNG_EVENT_CONTEXT_PADDING1];
230
d65106b1 231 union {
7d29a247 232 struct lttng_event_perf_counter_ctx perf_counter;
8d326ab9 233 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
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234 } u;
235};
236
b7384347 237/*
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238 * Event probe.
239 *
240 * Either addr is used or symbol_name and offset.
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241 *
242 * The structures should be initialized to zero before use.
57167058 243 */
8d326ab9 244#define LTTNG_EVENT_PROBE_PADDING1 16
7d29a247 245struct lttng_event_probe_attr {
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246 uint64_t addr;
247
248 uint64_t offset;
249 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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250
251 char padding[LTTNG_EVENT_PROBE_PADDING1];
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252};
253
b7384347 254/*
f3ed775e 255 * Function tracer
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256 *
257 * The structures should be initialized to zero before use.
f3ed775e 258 */
8d326ab9 259#define LTTNG_EVENT_FUNCTION_PADDING1 16
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260struct lttng_event_function_attr {
261 char symbol_name[LTTNG_SYMBOL_NAME_LEN];
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262
263 char padding[LTTNG_EVENT_FUNCTION_PADDING1];
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264};
265
266/*
267 * Generic lttng event
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268 *
269 * The structures should be initialized to zero before use.
f3ed775e 270 */
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271#define LTTNG_EVENT_PADDING1 16
272#define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 273struct lttng_event {
0cda4f28 274 enum lttng_event_type type;
f3ed775e 275 char name[LTTNG_SYMBOL_NAME_LEN];
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276
277 enum lttng_loglevel_type loglevel_type;
8005f29a 278 int loglevel;
0cda4f28 279
35dc4d62 280 int32_t enabled; /* Does not apply: -1 */
b551a063 281 pid_t pid;
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282
283 char padding[LTTNG_EVENT_PADDING1];
284
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285 /* Per event type configuration */
286 union {
7d29a247 287 struct lttng_event_probe_attr probe;
f3ed775e 288 struct lttng_event_function_attr ftrace;
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289
290 char padding[LTTNG_EVENT_PADDING2];
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291 } attr;
292};
293
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294enum lttng_event_field_type {
295 LTTNG_EVENT_FIELD_OTHER = 0,
296 LTTNG_EVENT_FIELD_INTEGER = 1,
297 LTTNG_EVENT_FIELD_ENUM = 2,
298 LTTNG_EVENT_FIELD_FLOAT = 3,
299 LTTNG_EVENT_FIELD_STRING = 4,
300};
301
302#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
303struct lttng_event_field {
304 char field_name[LTTNG_SYMBOL_NAME_LEN];
305 enum lttng_event_field_type type;
306 char padding[LTTNG_EVENT_FIELD_PADDING];
307 struct lttng_event event;
308};
309
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310/*
311 * Tracer channel attributes. For both kernel and user-space.
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312 *
313 * The structures should be initialized to zero before use.
e6ddca71 314 */
8d326ab9 315#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 316struct lttng_channel_attr {
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317 int overwrite; /* 1: overwrite, 0: discard */
318 uint64_t subbuf_size; /* bytes */
319 uint64_t num_subbuf; /* power of 2 */
320 unsigned int switch_timer_interval; /* usec */
321 unsigned int read_timer_interval; /* usec */
f05b5f07 322 enum lttng_event_output output; /* splice, mmap */
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323
324 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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325};
326
327/*
e6ddca71 328 * Channel information structure. For both kernel and user-space.
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329 *
330 * The structures should be initialized to zero before use.
1657e9bb 331 */
8d326ab9 332#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 333struct lttng_channel {
045e5491 334 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 335 uint32_t enabled;
e6ddca71 336 struct lttng_channel_attr attr;
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337
338 char padding[LTTNG_CHANNEL_PADDING1];
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339};
340
8d326ab9 341#define LTTNG_CALIBRATE_PADDING1 16
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342struct lttng_calibrate {
343 enum lttng_calibrate_type type;
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344
345 char padding[LTTNG_CALIBRATE_PADDING1];
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346};
347
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348/*
349 * Basic session information.
350 *
351 * This is an 'output data' meaning that it only comes *from* the session
352 * daemon *to* the lttng client. It's basically a 'human' representation of
353 * tracing entities (here a session).
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354 *
355 * The structures should be initialized to zero before use.
e6ddca71 356 */
8d326ab9 357#define LTTNG_SESSION_PADDING1 16
e6ddca71 358struct lttng_session {
f3ed775e 359 char name[NAME_MAX];
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360 /* The path where traces are written */
361 char path[PATH_MAX];
464dd62d 362 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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363
364 char padding[LTTNG_SESSION_PADDING1];
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365};
366
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367/*
368 * Handle used as a context for commands.
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369 *
370 * The structures should be initialized to zero before use.
cd80958d 371 */
8d326ab9 372#define LTTNG_HANDLE_PADDING1 16
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373struct lttng_handle {
374 char session_name[NAME_MAX];
375 struct lttng_domain domain;
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376
377 char padding[LTTNG_HANDLE_PADDING1];
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378};
379
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380/*
381 * Public LTTng control API
382 *
1e46a50f 383 * For functions having an lttng domain type as parameter, if a bad value is
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384 * given, NO default is applied and an error is returned.
385 *
386 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 387 * array (in bytes).
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388 *
389 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 390 * code which can be humanly interpreted with lttng_strerror(err).
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391 *
392 * Exceptions to this are noted below.
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393 */
394
b7384347 395/*
1e46a50f 396 * Create a handle used as a context for every request made to the library.
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397 *
398 * This handle contains the session name and lttng domain on which the command
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399 * will be executed.
400 * The returned pointer will be NULL in case of malloc() error.
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401 */
402extern struct lttng_handle *lttng_create_handle(const char *session_name,
403 struct lttng_domain *domain);
404
405/*
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406 * Destroy a handle. This will simply free(3) the data pointer returned by
407 * lttng_create_handle(), rendering it unusable.
b7384347 408 */
cd80958d 409extern void lttng_destroy_handle(struct lttng_handle *handle);
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410
411/*
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412 * Create a tracing session using a name and a path where the trace will be
413 * written.
7d29a247 414 */
38057ed1 415extern int lttng_create_session(const char *name, const char *path);
f3ed775e 416
7d29a247 417/*
1e46a50f 418 * Destroy a tracing session.
7d29a247 419 *
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420 * The session will not be usable anymore, tracing will be stopped for all
421 * registered traces, and the tracing buffers will be flushed.
7d29a247 422 */
843f5df9 423extern int lttng_destroy_session(const char *name);
f3ed775e 424
e6ddca71 425/*
1e46a50f 426 * List all the tracing sessions.
7d29a247 427 *
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428 * Return the size (number of entries) of the "lttng_session" array. Caller
429 * must free(3).
e6ddca71 430 */
ca95a216 431extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 432
9f19cc17 433/*
1e46a50f 434 * List the registered domain(s) of a session.
9f19cc17 435 *
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436 * Return the size (number of entries) of the "lttng_domain" array. Caller
437 * must free(3).
9f19cc17 438 */
330be774 439extern int lttng_list_domains(const char *session_name,
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440 struct lttng_domain **domains);
441
442/*
1e46a50f 443 * List the channel(s) of a session.
9f19cc17 444 *
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445 * Return the size (number of entries) of the "lttng_channel" array. Caller
446 * must free(3).
9f19cc17 447 */
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448extern int lttng_list_channels(struct lttng_handle *handle,
449 struct lttng_channel **channels);
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450
451/*
1e46a50f 452 * List the event(s) of a session channel.
9f19cc17 453 *
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454 * Return the size (number of entries) of the "lttng_event" array.
455 * Caller must free(3).
9f19cc17 456 */
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457extern int lttng_list_events(struct lttng_handle *handle,
458 const char *channel_name, struct lttng_event **events);
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459
460/*
1e46a50f 461 * List the available tracepoints of a specific lttng domain.
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 */
cd80958d 466extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 467 struct lttng_event **events);
9f19cc17 468
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469/*
470 * List the available tracepoints fields of a specific lttng domain.
471 *
472 * Return the size (number of entries) of the "lttng_event_field" array.
473 * Caller must free(3).
474 */
475extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
476 struct lttng_event_field **fields);
477
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478/*
479 * Check if a session daemon is alive.
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480 *
481 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 482 */
947308c4 483extern int lttng_session_daemon_alive(void);
f3ed775e 484
7d29a247 485/*
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486 * Set the tracing group for the *current* flow of execution.
487 *
488 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 489 */
b7384347 490extern int lttng_set_tracing_group(const char *name);
f3ed775e 491
7d29a247 492/*
1e46a50f 493 * Return a human-readable error message for an lttng-tools error code.
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494 *
495 * Parameter MUST be a negative value or else you'll get a generic message.
496 */
9a745bc7 497extern const char *lttng_strerror(int code);
b7384347 498
d9800920 499/*
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500 * This call registers an "outside consumer" for a session and an lttng domain.
501 * No consumer will be spawned and all fds/commands will go through the socket
502 * path given (socket_path).
d9800920 503 *
3bd1e081 504 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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505 * command socket. The error socket is not supported yet for roaming consumers.
506 */
507extern int lttng_register_consumer(struct lttng_handle *handle,
508 const char *socket_path);
509
7d29a247 510/*
1e46a50f 511 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 512 */
6a4f824d 513extern int lttng_start_tracing(const char *session_name);
f3ed775e 514
7d29a247 515/*
1e46a50f 516 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 517 */
6a4f824d 518extern int lttng_stop_tracing(const char *session_name);
f3ed775e 519
b7384347 520/*
1e46a50f 521 * Add context to event(s) for a specific channel (or for all).
7d29a247 522 *
1e46a50f 523 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 524 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 525 * If both are NULL, the context is applied to all events of all channels.
b7384347 526 */
cd80958d 527extern int lttng_add_context(struct lttng_handle *handle,
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528 struct lttng_event_context *ctx, const char *event_name,
529 const char *channel_name);
f3ed775e 530
7d29a247 531/*
c8f61fc6 532 * Create or enable an event (or events) for a channel.
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533 *
534 * If the event you are trying to enable does not exist, it will be created,
535 * else it is enabled.
1e46a50f 536 * If event_name is NULL, all events are enabled.
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537 * If channel_name is NULL, the default channel is used (channel0).
538 */
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539extern int lttng_enable_event(struct lttng_handle *handle,
540 struct lttng_event *ev, const char *channel_name);
f3ed775e 541
7d29a247 542/*
c8f61fc6 543 * Create or enable a channel.
1e46a50f 544 * The channel name cannot be NULL.
7d29a247 545 */
cd80958d 546extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 547 struct lttng_channel *chan);
f3ed775e 548
7d29a247 549/*
c8f61fc6 550 * Disable event(s) of a channel and domain.
7d29a247 551 *
1e46a50f 552 * If event_name is NULL, all events are disabled.
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553 * If channel_name is NULL, the default channel is used (channel0).
554 */
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555extern int lttng_disable_event(struct lttng_handle *handle,
556 const char *name, const char *channel_name);
fac6795d 557
1df4dedd 558/*
c8f61fc6 559 * Disable channel.
7d29a247 560 *
1e46a50f 561 * The channel name cannot be NULL.
1df4dedd 562 */
cd80958d 563extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 564 const char *name);
1df4dedd 565
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566/*
567 * Calibrate LTTng overhead.
568 */
cd80958d 569extern int lttng_calibrate(struct lttng_handle *handle,
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570 struct lttng_calibrate *calibrate);
571
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572/*
573 * Set the default channel attributes for a specific domain and an allocated
574 * lttng_channel_attr pointer.
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575 *
576 * If either or both of the arguments are NULL, nothing happens.
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577 */
578extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
579 struct lttng_channel_attr *attr);
580
b7384347 581#endif /* _LTTNG_H */
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