Cleanup: rename session list count to "next_uuid"
[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 */
fceb65df 272#define LTTNG_EVENT_PADDING1 15
8d326ab9 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;
fceb65df 283 unsigned char filter; /* filter enabled ? */
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284
285 char padding[LTTNG_EVENT_PADDING1];
286
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287 /* Per event type configuration */
288 union {
7d29a247 289 struct lttng_event_probe_attr probe;
f3ed775e 290 struct lttng_event_function_attr ftrace;
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291
292 char padding[LTTNG_EVENT_PADDING2];
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293 } attr;
294};
295
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296enum lttng_event_field_type {
297 LTTNG_EVENT_FIELD_OTHER = 0,
298 LTTNG_EVENT_FIELD_INTEGER = 1,
299 LTTNG_EVENT_FIELD_ENUM = 2,
300 LTTNG_EVENT_FIELD_FLOAT = 3,
301 LTTNG_EVENT_FIELD_STRING = 4,
302};
303
304#define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32
305struct lttng_event_field {
306 char field_name[LTTNG_SYMBOL_NAME_LEN];
307 enum lttng_event_field_type type;
308 char padding[LTTNG_EVENT_FIELD_PADDING];
309 struct lttng_event event;
310};
311
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312/*
313 * Tracer channel attributes. For both kernel and user-space.
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314 *
315 * The structures should be initialized to zero before use.
e6ddca71 316 */
8d326ab9 317#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 32
f3ed775e 318struct lttng_channel_attr {
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319 int overwrite; /* 1: overwrite, 0: discard */
320 uint64_t subbuf_size; /* bytes */
321 uint64_t num_subbuf; /* power of 2 */
322 unsigned int switch_timer_interval; /* usec */
323 unsigned int read_timer_interval; /* usec */
f05b5f07 324 enum lttng_event_output output; /* splice, mmap */
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325
326 char padding[LTTNG_CHANNEL_ATTR_PADDING1];
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327};
328
329/*
e6ddca71 330 * Channel information structure. For both kernel and user-space.
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331 *
332 * The structures should be initialized to zero before use.
1657e9bb 333 */
8d326ab9 334#define LTTNG_CHANNEL_PADDING1 16
e6ddca71 335struct lttng_channel {
045e5491 336 char name[LTTNG_SYMBOL_NAME_LEN];
9f19cc17 337 uint32_t enabled;
e6ddca71 338 struct lttng_channel_attr attr;
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339
340 char padding[LTTNG_CHANNEL_PADDING1];
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341};
342
8d326ab9 343#define LTTNG_CALIBRATE_PADDING1 16
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344struct lttng_calibrate {
345 enum lttng_calibrate_type type;
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346
347 char padding[LTTNG_CALIBRATE_PADDING1];
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348};
349
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350/*
351 * Basic session information.
352 *
353 * This is an 'output data' meaning that it only comes *from* the session
354 * daemon *to* the lttng client. It's basically a 'human' representation of
355 * tracing entities (here a session).
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356 *
357 * The structures should be initialized to zero before use.
e6ddca71 358 */
8d326ab9 359#define LTTNG_SESSION_PADDING1 16
e6ddca71 360struct lttng_session {
f3ed775e 361 char name[NAME_MAX];
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362 /* The path where traces are written */
363 char path[PATH_MAX];
464dd62d 364 uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
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365
366 char padding[LTTNG_SESSION_PADDING1];
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367};
368
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369/*
370 * Handle used as a context for commands.
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371 *
372 * The structures should be initialized to zero before use.
cd80958d 373 */
8d326ab9 374#define LTTNG_HANDLE_PADDING1 16
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375struct lttng_handle {
376 char session_name[NAME_MAX];
377 struct lttng_domain domain;
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378
379 char padding[LTTNG_HANDLE_PADDING1];
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380};
381
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382/*
383 * Public LTTng control API
384 *
1e46a50f 385 * For functions having an lttng domain type as parameter, if a bad value is
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386 * given, NO default is applied and an error is returned.
387 *
388 * On success, all functions of the API return 0 or the size of the allocated
1e46a50f 389 * array (in bytes).
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390 *
391 * On error, a negative value is returned being a specific lttng-tools error
9a745bc7 392 * code which can be humanly interpreted with lttng_strerror(err).
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393 *
394 * Exceptions to this are noted below.
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395 */
396
b7384347 397/*
1e46a50f 398 * Create a handle used as a context for every request made to the library.
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399 *
400 * This handle contains the session name and lttng domain on which the command
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401 * will be executed.
402 * The returned pointer will be NULL in case of malloc() error.
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403 */
404extern struct lttng_handle *lttng_create_handle(const char *session_name,
405 struct lttng_domain *domain);
406
407/*
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408 * Destroy a handle. This will simply free(3) the data pointer returned by
409 * lttng_create_handle(), rendering it unusable.
b7384347 410 */
cd80958d 411extern void lttng_destroy_handle(struct lttng_handle *handle);
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412
413/*
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414 * Create a tracing session using a name and a path where the trace will be
415 * written.
7d29a247 416 */
38057ed1 417extern int lttng_create_session(const char *name, const char *path);
f3ed775e 418
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419/*
420 * Create a tracing sessioin using a name, URIs and a consumer enable flag.
421 * The control URI is mandatory for consumer local or network.
422 */
423extern int lttng_create_session_uri(const char *name,
424 struct lttng_uri *ctrl_uri, struct lttng_uri *data_uri,
425 unsigned int enable_consumer);
426
7d29a247 427/*
1e46a50f 428 * Destroy a tracing session.
7d29a247 429 *
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430 * The session will not be usable anymore, tracing will be stopped for all
431 * registered traces, and the tracing buffers will be flushed.
7d29a247 432 */
843f5df9 433extern int lttng_destroy_session(const char *name);
f3ed775e 434
e6ddca71 435/*
1e46a50f 436 * List all the tracing sessions.
7d29a247 437 *
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438 * Return the size (number of entries) of the "lttng_session" array. Caller
439 * must free(3).
e6ddca71 440 */
ca95a216 441extern int lttng_list_sessions(struct lttng_session **sessions);
f3ed775e 442
9f19cc17 443/*
1e46a50f 444 * List the registered domain(s) of a session.
9f19cc17 445 *
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446 * Return the size (number of entries) of the "lttng_domain" array. Caller
447 * must free(3).
9f19cc17 448 */
330be774 449extern int lttng_list_domains(const char *session_name,
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450 struct lttng_domain **domains);
451
452/*
1e46a50f 453 * List the channel(s) of a session.
9f19cc17 454 *
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455 * Return the size (number of entries) of the "lttng_channel" array. Caller
456 * must free(3).
9f19cc17 457 */
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458extern int lttng_list_channels(struct lttng_handle *handle,
459 struct lttng_channel **channels);
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460
461/*
1e46a50f 462 * List the event(s) of a session channel.
9f19cc17 463 *
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464 * Return the size (number of entries) of the "lttng_event" array.
465 * Caller must free(3).
9f19cc17 466 */
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467extern int lttng_list_events(struct lttng_handle *handle,
468 const char *channel_name, struct lttng_event **events);
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469
470/*
1e46a50f 471 * List the available tracepoints of a specific lttng domain.
9f19cc17 472 *
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473 * Return the size (number of entries) of the "lttng_event" array.
474 * Caller must free(3).
9f19cc17 475 */
cd80958d 476extern int lttng_list_tracepoints(struct lttng_handle *handle,
2a71efd5 477 struct lttng_event **events);
9f19cc17 478
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479/*
480 * List the available tracepoints fields of a specific lttng domain.
481 *
482 * Return the size (number of entries) of the "lttng_event_field" array.
483 * Caller must free(3).
484 */
485extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
486 struct lttng_event_field **fields);
487
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488/*
489 * Check if a session daemon is alive.
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490 *
491 * Return 1 if alive or 0 if not. On error returns a negative value.
7d29a247 492 */
947308c4 493extern int lttng_session_daemon_alive(void);
f3ed775e 494
7d29a247 495/*
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496 * Set the tracing group for the *current* flow of execution.
497 *
498 * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
7d29a247 499 */
b7384347 500extern int lttng_set_tracing_group(const char *name);
f3ed775e 501
7d29a247 502/*
1e46a50f 503 * Return a human-readable error message for an lttng-tools error code.
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504 *
505 * Parameter MUST be a negative value or else you'll get a generic message.
506 */
9a745bc7 507extern const char *lttng_strerror(int code);
b7384347 508
d9800920 509/*
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510 * This call registers an "outside consumer" for a session and an lttng domain.
511 * No consumer will be spawned and all fds/commands will go through the socket
512 * path given (socket_path).
d9800920 513 *
3bd1e081 514 * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the
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515 * command socket. The error socket is not supported yet for roaming consumers.
516 */
517extern int lttng_register_consumer(struct lttng_handle *handle,
518 const char *socket_path);
519
7d29a247 520/*
1e46a50f 521 * Start tracing for *all* registered traces (kernel and user-space).
7d29a247 522 */
6a4f824d 523extern int lttng_start_tracing(const char *session_name);
f3ed775e 524
7d29a247 525/*
1e46a50f 526 * Stop tracing for *all* registered traces (kernel and user-space).
7d29a247 527 */
6a4f824d 528extern int lttng_stop_tracing(const char *session_name);
f3ed775e 529
b7384347 530/*
1e46a50f 531 * Add context to event(s) for a specific channel (or for all).
7d29a247 532 *
1e46a50f 533 * If event_name is NULL, the context is applied to all events of the channel.
7d29a247 534 * If channel_name is NULL, a lookup of the event's channel is done.
1e46a50f 535 * If both are NULL, the context is applied to all events of all channels.
b7384347 536 */
cd80958d 537extern int lttng_add_context(struct lttng_handle *handle,
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538 struct lttng_event_context *ctx, const char *event_name,
539 const char *channel_name);
f3ed775e 540
7d29a247 541/*
c8f61fc6 542 * Create or enable an event (or events) for a channel.
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543 *
544 * If the event you are trying to enable does not exist, it will be created,
545 * else it is enabled.
1e46a50f 546 * If event_name is NULL, all events are enabled.
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547 * If channel_name is NULL, the default channel is used (channel0).
548 */
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549extern int lttng_enable_event(struct lttng_handle *handle,
550 struct lttng_event *ev, const char *channel_name);
f3ed775e 551
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552/*
553 * Apply a filter expression to an event.
554 *
555 * If event_name is NULL, the filter is applied to all events of the channel.
556 * If channel_name is NULL, a lookup of the event's channel is done.
557 * If both are NULL, the filter is applied to all events of all channels.
558 */
559extern int lttng_set_event_filter(struct lttng_handle *handle,
560 const char *event_name,
561 const char *channel_name,
562 const char *filter_expression);
7d29a247 563/*
c8f61fc6 564 * Create or enable a channel.
1e46a50f 565 * The channel name cannot be NULL.
7d29a247 566 */
cd80958d 567extern int lttng_enable_channel(struct lttng_handle *handle,
38057ed1 568 struct lttng_channel *chan);
f3ed775e 569
7d29a247 570/*
c8f61fc6 571 * Disable event(s) of a channel and domain.
7d29a247 572 *
1e46a50f 573 * If event_name is NULL, all events are disabled.
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574 * If channel_name is NULL, the default channel is used (channel0).
575 */
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576extern int lttng_disable_event(struct lttng_handle *handle,
577 const char *name, const char *channel_name);
fac6795d 578
1df4dedd 579/*
c8f61fc6 580 * Disable channel.
7d29a247 581 *
1e46a50f 582 * The channel name cannot be NULL.
1df4dedd 583 */
cd80958d 584extern int lttng_disable_channel(struct lttng_handle *handle,
38057ed1 585 const char *name);
1df4dedd 586
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587/*
588 * Calibrate LTTng overhead.
589 */
cd80958d 590extern int lttng_calibrate(struct lttng_handle *handle,
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591 struct lttng_calibrate *calibrate);
592
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593/*
594 * Set the default channel attributes for a specific domain and an allocated
595 * lttng_channel_attr pointer.
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596 *
597 * If either or both of the arguments are NULL, nothing happens.
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598 */
599extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
600 struct lttng_channel_attr *attr);
601
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602/*
603 * Set URI for a consumer for a session and domain.
604 *
605 * For network streaming, both data and control stream type MUST be defined
606 * with a specific URIs. Default port are 5342 and 5343 respectively for
607 * control and data which uses the TCP protocol.
608 */
609extern int lttng_set_consumer_uri(struct lttng_handle *handle,
610 struct lttng_uri *uri);
611
612/*
613 * Enable the consumer for a session and domain.
614 */
615extern int lttng_enable_consumer(struct lttng_handle *handle);
616
617/*
618 * Disable consumer for a session and domain.
619 */
620extern int lttng_disable_consumer(struct lttng_handle *handle);
621
b7384347 622#endif /* _LTTNG_H */
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