| 1 | /* |
| 2 | * lttng.h |
| 3 | * |
| 4 | * Linux Trace Toolkit Control Library Header File |
| 5 | * |
| 6 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 7 | * |
| 8 | * This library is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 10 | * as published by the Free Software Foundation. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | #ifndef LTTNG_H |
| 23 | #define LTTNG_H |
| 24 | |
| 25 | #include <limits.h> |
| 26 | #include <stdint.h> |
| 27 | #include <sys/types.h> |
| 28 | |
| 29 | /* Error codes that can be returned by API calls */ |
| 30 | #include <lttng/lttng-error.h> |
| 31 | |
| 32 | #ifdef __cplusplus |
| 33 | extern "C" { |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * Event symbol length. Copied from LTTng kernel ABI. |
| 38 | */ |
| 39 | #define LTTNG_SYMBOL_NAME_LEN 256 |
| 40 | |
| 41 | /* |
| 42 | * Every lttng_event_* structure both apply to kernel event and user-space |
| 43 | * event. |
| 44 | */ |
| 45 | |
| 46 | /* |
| 47 | * Domain types: the different possible tracers. |
| 48 | */ |
| 49 | enum lttng_domain_type { |
| 50 | LTTNG_DOMAIN_KERNEL = 1, |
| 51 | LTTNG_DOMAIN_UST = 2, |
| 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 | * |
| 58 | LTTNG_DOMAIN_UST_EXEC_NAME = 3, |
| 59 | LTTNG_DOMAIN_UST_PID = 4, |
| 60 | LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN = 5, |
| 61 | */ |
| 62 | }; |
| 63 | |
| 64 | /* |
| 65 | * Instrumentation type of tracing event. |
| 66 | */ |
| 67 | enum lttng_event_type { |
| 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, |
| 75 | }; |
| 76 | |
| 77 | /* |
| 78 | * Loglevel information. |
| 79 | */ |
| 80 | enum lttng_loglevel_type { |
| 81 | LTTNG_EVENT_LOGLEVEL_ALL = 0, |
| 82 | LTTNG_EVENT_LOGLEVEL_RANGE = 1, |
| 83 | LTTNG_EVENT_LOGLEVEL_SINGLE = 2, |
| 84 | }; |
| 85 | |
| 86 | /* |
| 87 | * Available loglevels. |
| 88 | */ |
| 89 | enum 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 | |
| 107 | /* |
| 108 | * LTTng consumer mode |
| 109 | */ |
| 110 | enum lttng_event_output { |
| 111 | LTTNG_EVENT_SPLICE = 0, |
| 112 | LTTNG_EVENT_MMAP = 1, |
| 113 | }; |
| 114 | |
| 115 | /* Event context possible type */ |
| 116 | enum lttng_event_context_type { |
| 117 | LTTNG_EVENT_CONTEXT_PID = 0, |
| 118 | LTTNG_EVENT_CONTEXT_PERF_COUNTER = 1, |
| 119 | LTTNG_EVENT_CONTEXT_PROCNAME = 2, |
| 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, |
| 127 | LTTNG_EVENT_CONTEXT_PTHREAD_ID = 10, |
| 128 | LTTNG_EVENT_CONTEXT_HOSTNAME = 11, |
| 129 | LTTNG_EVENT_CONTEXT_IP = 12, |
| 130 | }; |
| 131 | |
| 132 | enum lttng_calibrate_type { |
| 133 | LTTNG_CALIBRATE_FUNCTION = 0, |
| 134 | }; |
| 135 | |
| 136 | /* Health component for the health check function. */ |
| 137 | enum lttng_health_component { |
| 138 | LTTNG_HEALTH_CMD, |
| 139 | LTTNG_HEALTH_APP_MANAGE, |
| 140 | LTTNG_HEALTH_APP_REG, |
| 141 | LTTNG_HEALTH_KERNEL, |
| 142 | LTTNG_HEALTH_CONSUMER, |
| 143 | LTTNG_HEALTH_HT_CLEANUP, |
| 144 | LTTNG_HEALTH_APP_MANAGE_NOTIFY, |
| 145 | LTTNG_HEALTH_APP_REG_DISPATCH, |
| 146 | LTTNG_HEALTH_ALL, |
| 147 | }; |
| 148 | |
| 149 | /* Buffer type for a specific domain. */ |
| 150 | enum lttng_buffer_type { |
| 151 | LTTNG_BUFFER_PER_PID, /* Only supported by UST being the default. */ |
| 152 | LTTNG_BUFFER_PER_UID, /* Only supported by UST. */ |
| 153 | LTTNG_BUFFER_GLOBAL, /* Only supported by the Kernel. */ |
| 154 | }; |
| 155 | |
| 156 | /* |
| 157 | * The structures should be initialized to zero before use. |
| 158 | */ |
| 159 | #define LTTNG_DOMAIN_PADDING1 12 |
| 160 | #define LTTNG_DOMAIN_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 |
| 161 | struct lttng_domain { |
| 162 | enum lttng_domain_type type; |
| 163 | enum lttng_buffer_type buf_type; |
| 164 | char padding[LTTNG_DOMAIN_PADDING1]; |
| 165 | |
| 166 | union { |
| 167 | pid_t pid; |
| 168 | char exec_name[NAME_MAX]; |
| 169 | char padding[LTTNG_DOMAIN_PADDING2]; |
| 170 | } attr; |
| 171 | }; |
| 172 | |
| 173 | /* |
| 174 | * Perf counter attributes |
| 175 | * |
| 176 | * The structures should be initialized to zero before use. |
| 177 | */ |
| 178 | #define LTTNG_PERF_EVENT_PADDING1 16 |
| 179 | struct lttng_event_perf_counter_ctx { |
| 180 | uint32_t type; |
| 181 | uint64_t config; |
| 182 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 183 | |
| 184 | char padding[LTTNG_PERF_EVENT_PADDING1]; |
| 185 | }; |
| 186 | |
| 187 | /* |
| 188 | * Event/channel context |
| 189 | * |
| 190 | * The structures should be initialized to zero before use. |
| 191 | */ |
| 192 | #define LTTNG_EVENT_CONTEXT_PADDING1 16 |
| 193 | #define LTTNG_EVENT_CONTEXT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 |
| 194 | struct lttng_event_context { |
| 195 | enum lttng_event_context_type ctx; |
| 196 | char padding[LTTNG_EVENT_CONTEXT_PADDING1]; |
| 197 | |
| 198 | union { |
| 199 | struct lttng_event_perf_counter_ctx perf_counter; |
| 200 | char padding[LTTNG_EVENT_CONTEXT_PADDING2]; |
| 201 | } u; |
| 202 | }; |
| 203 | |
| 204 | /* |
| 205 | * Event probe. |
| 206 | * |
| 207 | * Either addr is used or symbol_name and offset. |
| 208 | * |
| 209 | * The structures should be initialized to zero before use. |
| 210 | */ |
| 211 | #define LTTNG_EVENT_PROBE_PADDING1 16 |
| 212 | struct lttng_event_probe_attr { |
| 213 | uint64_t addr; |
| 214 | |
| 215 | uint64_t offset; |
| 216 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; |
| 217 | |
| 218 | char padding[LTTNG_EVENT_PROBE_PADDING1]; |
| 219 | }; |
| 220 | |
| 221 | /* |
| 222 | * Function tracer |
| 223 | * |
| 224 | * The structures should be initialized to zero before use. |
| 225 | */ |
| 226 | #define LTTNG_EVENT_FUNCTION_PADDING1 16 |
| 227 | struct lttng_event_function_attr { |
| 228 | char symbol_name[LTTNG_SYMBOL_NAME_LEN]; |
| 229 | |
| 230 | char padding[LTTNG_EVENT_FUNCTION_PADDING1]; |
| 231 | }; |
| 232 | |
| 233 | /* |
| 234 | * Generic lttng event |
| 235 | * |
| 236 | * The structures should be initialized to zero before use. |
| 237 | */ |
| 238 | #define LTTNG_EVENT_PADDING1 15 |
| 239 | #define LTTNG_EVENT_PADDING2 LTTNG_SYMBOL_NAME_LEN + 32 |
| 240 | struct lttng_event { |
| 241 | enum lttng_event_type type; |
| 242 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 243 | |
| 244 | enum lttng_loglevel_type loglevel_type; |
| 245 | int loglevel; |
| 246 | |
| 247 | int32_t enabled; /* Does not apply: -1 */ |
| 248 | pid_t pid; |
| 249 | unsigned char filter; /* filter enabled ? */ |
| 250 | |
| 251 | char padding[LTTNG_EVENT_PADDING1]; |
| 252 | |
| 253 | /* Per event type configuration */ |
| 254 | union { |
| 255 | struct lttng_event_probe_attr probe; |
| 256 | struct lttng_event_function_attr ftrace; |
| 257 | |
| 258 | char padding[LTTNG_EVENT_PADDING2]; |
| 259 | } attr; |
| 260 | }; |
| 261 | |
| 262 | enum lttng_event_field_type { |
| 263 | LTTNG_EVENT_FIELD_OTHER = 0, |
| 264 | LTTNG_EVENT_FIELD_INTEGER = 1, |
| 265 | LTTNG_EVENT_FIELD_ENUM = 2, |
| 266 | LTTNG_EVENT_FIELD_FLOAT = 3, |
| 267 | LTTNG_EVENT_FIELD_STRING = 4, |
| 268 | }; |
| 269 | |
| 270 | #define LTTNG_EVENT_FIELD_PADDING LTTNG_SYMBOL_NAME_LEN + 32 |
| 271 | struct lttng_event_field { |
| 272 | char field_name[LTTNG_SYMBOL_NAME_LEN]; |
| 273 | enum lttng_event_field_type type; |
| 274 | char padding[LTTNG_EVENT_FIELD_PADDING]; |
| 275 | struct lttng_event event; |
| 276 | int nowrite; |
| 277 | }; |
| 278 | |
| 279 | /* |
| 280 | * Tracer channel attributes. For both kernel and user-space. |
| 281 | * |
| 282 | * The structures should be initialized to zero before use. |
| 283 | */ |
| 284 | #define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 16 |
| 285 | struct lttng_channel_attr { |
| 286 | int overwrite; /* 1: overwrite, 0: discard */ |
| 287 | uint64_t subbuf_size; /* bytes */ |
| 288 | uint64_t num_subbuf; /* power of 2 */ |
| 289 | unsigned int switch_timer_interval; /* usec */ |
| 290 | unsigned int read_timer_interval; /* usec */ |
| 291 | enum lttng_event_output output; /* splice, mmap */ |
| 292 | /* LTTng 2.1 padding limit */ |
| 293 | uint64_t tracefile_size; /* bytes */ |
| 294 | uint64_t tracefile_count; /* number of tracefiles */ |
| 295 | |
| 296 | char padding[LTTNG_CHANNEL_ATTR_PADDING1]; |
| 297 | }; |
| 298 | |
| 299 | /* |
| 300 | * Channel information structure. For both kernel and user-space. |
| 301 | * |
| 302 | * The structures should be initialized to zero before use. |
| 303 | */ |
| 304 | #define LTTNG_CHANNEL_PADDING1 16 |
| 305 | struct lttng_channel { |
| 306 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 307 | uint32_t enabled; |
| 308 | struct lttng_channel_attr attr; |
| 309 | |
| 310 | char padding[LTTNG_CHANNEL_PADDING1]; |
| 311 | }; |
| 312 | |
| 313 | #define LTTNG_CALIBRATE_PADDING1 16 |
| 314 | struct lttng_calibrate { |
| 315 | enum lttng_calibrate_type type; |
| 316 | |
| 317 | char padding[LTTNG_CALIBRATE_PADDING1]; |
| 318 | }; |
| 319 | |
| 320 | /* |
| 321 | * Basic session information. |
| 322 | * |
| 323 | * This is an 'output data' meaning that it only comes *from* the session |
| 324 | * daemon *to* the lttng client. It's basically a 'human' representation of |
| 325 | * tracing entities (here a session). |
| 326 | * |
| 327 | * The structures should be initialized to zero before use. |
| 328 | */ |
| 329 | #define LTTNG_SESSION_PADDING1 12 |
| 330 | struct lttng_session { |
| 331 | char name[NAME_MAX]; |
| 332 | /* The path where traces are written */ |
| 333 | char path[PATH_MAX]; |
| 334 | uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */ |
| 335 | uint32_t snapshot_mode; |
| 336 | |
| 337 | char padding[LTTNG_SESSION_PADDING1]; |
| 338 | }; |
| 339 | |
| 340 | /* |
| 341 | * Handle used as a context for commands. |
| 342 | * |
| 343 | * The structures should be initialized to zero before use. |
| 344 | */ |
| 345 | #define LTTNG_HANDLE_PADDING1 16 |
| 346 | struct lttng_handle { |
| 347 | char session_name[NAME_MAX]; |
| 348 | struct lttng_domain domain; |
| 349 | |
| 350 | char padding[LTTNG_HANDLE_PADDING1]; |
| 351 | }; |
| 352 | |
| 353 | /* |
| 354 | * Public LTTng control API |
| 355 | * |
| 356 | * For functions having an lttng domain type as parameter, if a bad value is |
| 357 | * given, NO default is applied and an error is returned. |
| 358 | * |
| 359 | * On success, all functions of the API return 0 or the size of the allocated |
| 360 | * array (in bytes). |
| 361 | * |
| 362 | * On error, a negative value is returned being a specific lttng-tools error |
| 363 | * code which can be humanly interpreted with lttng_strerror(err). |
| 364 | * |
| 365 | * Exceptions to this are noted below. |
| 366 | */ |
| 367 | |
| 368 | /* |
| 369 | * Create a handle used as a context for every request made to the library. |
| 370 | * |
| 371 | * This handle contains the session name and lttng domain on which the command |
| 372 | * will be executed. |
| 373 | * The returned pointer will be NULL in case of malloc() error. |
| 374 | */ |
| 375 | extern struct lttng_handle *lttng_create_handle(const char *session_name, |
| 376 | struct lttng_domain *domain); |
| 377 | |
| 378 | /* |
| 379 | * Destroy an handle. |
| 380 | * |
| 381 | * It free(3) the data pointer returned by lttng_create_handle(), rendering it |
| 382 | * unusable. |
| 383 | */ |
| 384 | extern void lttng_destroy_handle(struct lttng_handle *handle); |
| 385 | |
| 386 | /* |
| 387 | * Create a tracing session using a name and an optional URL. |
| 388 | * |
| 389 | * If _url_ is NULL, no consumer is created for the session. The name can't be |
| 390 | * NULL here. |
| 391 | */ |
| 392 | extern int lttng_create_session(const char *name, const char *url); |
| 393 | |
| 394 | /* |
| 395 | * Create a tracing session that will exclusively be used for snapshot meaning |
| 396 | * the session will be in no output mode and every channel enabled for that |
| 397 | * session will be set in overwrite mode and in mmap output since splice is not |
| 398 | * supported. |
| 399 | * |
| 400 | * If an url is given, it will be used to create a default snapshot output |
| 401 | * using it as a destination. If NULL, no output will be defined and an |
| 402 | * add-output call will be needed. |
| 403 | * |
| 404 | * Name can't be NULL. |
| 405 | */ |
| 406 | extern int lttng_create_session_snapshot(const char *name, |
| 407 | const char *snapshot_url); |
| 408 | |
| 409 | /* |
| 410 | * Destroy a tracing session. |
| 411 | * |
| 412 | * The session will not be usable anymore, tracing will be stopped for all |
| 413 | * registered traces, and the tracing buffers will be flushed. |
| 414 | * |
| 415 | * The name can't be NULL here. |
| 416 | */ |
| 417 | extern int lttng_destroy_session(const char *name); |
| 418 | |
| 419 | /* |
| 420 | * List all the tracing sessions. |
| 421 | * |
| 422 | * Return the size (number of entries) of the "lttng_session" array. Caller |
| 423 | * must free(3). |
| 424 | */ |
| 425 | extern int lttng_list_sessions(struct lttng_session **sessions); |
| 426 | |
| 427 | /* |
| 428 | * List the registered domain(s) of a session. |
| 429 | * |
| 430 | * Return the size (number of entries) of the "lttng_domain" array. Caller |
| 431 | * must free(3). |
| 432 | */ |
| 433 | extern int lttng_list_domains(const char *session_name, |
| 434 | struct lttng_domain **domains); |
| 435 | |
| 436 | /* |
| 437 | * List the channel(s) of a session. |
| 438 | * |
| 439 | * Return the size (number of entries) of the "lttng_channel" array. Caller |
| 440 | * must free(3). |
| 441 | */ |
| 442 | extern int lttng_list_channels(struct lttng_handle *handle, |
| 443 | struct lttng_channel **channels); |
| 444 | |
| 445 | /* |
| 446 | * List the event(s) of a session channel. |
| 447 | * |
| 448 | * Return the size (number of entries) of the "lttng_event" array. |
| 449 | * Caller must free(3). |
| 450 | */ |
| 451 | extern int lttng_list_events(struct lttng_handle *handle, |
| 452 | const char *channel_name, struct lttng_event **events); |
| 453 | |
| 454 | /* |
| 455 | * List the available tracepoints of a specific lttng domain. |
| 456 | * |
| 457 | * Return the size (number of entries) of the "lttng_event" array. |
| 458 | * Caller must free(3). |
| 459 | */ |
| 460 | extern int lttng_list_tracepoints(struct lttng_handle *handle, |
| 461 | struct lttng_event **events); |
| 462 | |
| 463 | /* |
| 464 | * List the available tracepoints fields of a specific lttng domain. |
| 465 | * |
| 466 | * Return the size (number of entries) of the "lttng_event_field" array. |
| 467 | * Caller must free(3). |
| 468 | */ |
| 469 | extern int lttng_list_tracepoint_fields(struct lttng_handle *handle, |
| 470 | struct lttng_event_field **fields); |
| 471 | |
| 472 | /* |
| 473 | * Check if a session daemon is alive. |
| 474 | * |
| 475 | * Return 1 if alive or 0 if not. On error returns a negative value. |
| 476 | */ |
| 477 | extern int lttng_session_daemon_alive(void); |
| 478 | |
| 479 | /* |
| 480 | * Set the tracing group for the *current* flow of execution. |
| 481 | * |
| 482 | * On success, returns 0 else a negative value on error being a lttng error |
| 483 | * code found in lttng-error.h |
| 484 | */ |
| 485 | extern int lttng_set_tracing_group(const char *name); |
| 486 | |
| 487 | /* |
| 488 | * Return a human-readable error message for an lttng-tools error code. |
| 489 | * |
| 490 | * Parameter MUST be a negative value or else you'll get a generic message. |
| 491 | */ |
| 492 | extern const char *lttng_strerror(int code); |
| 493 | |
| 494 | /* |
| 495 | * This call registers an "outside consumer" for a session and an lttng domain. |
| 496 | * No consumer will be spawned and all fds/commands will go through the socket |
| 497 | * path given (socket_path). |
| 498 | * |
| 499 | * NOTE: At the moment, if you use the liblttng-kconsumer, you can only use the |
| 500 | * command socket. The error socket is not supported yet for roaming consumers. |
| 501 | */ |
| 502 | extern int lttng_register_consumer(struct lttng_handle *handle, |
| 503 | const char *socket_path); |
| 504 | |
| 505 | /* |
| 506 | * Start tracing for *all* registered traces (kernel and user-space). |
| 507 | */ |
| 508 | extern int lttng_start_tracing(const char *session_name); |
| 509 | |
| 510 | /* |
| 511 | * Stop tracing for *all* registered traces (kernel and user-space). |
| 512 | * |
| 513 | * This call will wait for data availability for each domain of the session so |
| 514 | * this can take an abritrary amount of time. However, when returning you have |
| 515 | * the guarantee that the data is ready to be read and analyse. Use the |
| 516 | * _no_wait call below to avoid this behavior. |
| 517 | * |
| 518 | * The session_name can't be NULL. |
| 519 | */ |
| 520 | extern int lttng_stop_tracing(const char *session_name); |
| 521 | |
| 522 | /* |
| 523 | * Behave exactly like lttng_stop_tracing but does not wait for data |
| 524 | * availability. |
| 525 | */ |
| 526 | extern int lttng_stop_tracing_no_wait(const char *session_name); |
| 527 | |
| 528 | /* |
| 529 | * Add context to event(s) for a specific channel (or for all). |
| 530 | * |
| 531 | * If channel_name is NULL, a lookup of the event's channel is done. If both |
| 532 | * are NULL, the context is applied to all events of all channels. |
| 533 | * |
| 534 | * Note that whatever event_name value is, a context can not be added to an |
| 535 | * event, so we just ignore it for now. |
| 536 | */ |
| 537 | extern int lttng_add_context(struct lttng_handle *handle, |
| 538 | struct lttng_event_context *ctx, const char *event_name, |
| 539 | const char *channel_name); |
| 540 | |
| 541 | /* |
| 542 | * Create or enable an event (or events) for a channel. |
| 543 | * |
| 544 | * If the event you are trying to enable does not exist, it will be created, |
| 545 | * else it is enabled. |
| 546 | * If channel_name is NULL, the default channel is used (channel0). |
| 547 | * |
| 548 | * The handle and ev params can not be NULL. |
| 549 | */ |
| 550 | extern int lttng_enable_event(struct lttng_handle *handle, |
| 551 | struct lttng_event *ev, const char *channel_name); |
| 552 | |
| 553 | /* |
| 554 | * Create or enable an event with a specific filter. |
| 555 | * |
| 556 | * If the event you are trying to enable does not exist, it will be created, |
| 557 | * else it is enabled. |
| 558 | * If ev is NULL, all events are enabled with that filter. |
| 559 | * If channel_name is NULL, the default channel is used (channel0) and created |
| 560 | * if not found. |
| 561 | * If filter_expression is NULL, an event without associated filter is |
| 562 | * created. |
| 563 | */ |
| 564 | extern int lttng_enable_event_with_filter(struct lttng_handle *handle, |
| 565 | struct lttng_event *event, const char *channel_name, |
| 566 | const char *filter_expression); |
| 567 | |
| 568 | /* |
| 569 | * Create or enable a channel. |
| 570 | * |
| 571 | * The chan and handle params can not be NULL. |
| 572 | */ |
| 573 | extern int lttng_enable_channel(struct lttng_handle *handle, |
| 574 | struct lttng_channel *chan); |
| 575 | |
| 576 | /* |
| 577 | * Disable event(s) of a channel and domain. |
| 578 | * |
| 579 | * If name is NULL, all events are disabled. |
| 580 | * If channel_name is NULL, the default channel is used (channel0). |
| 581 | */ |
| 582 | extern int lttng_disable_event(struct lttng_handle *handle, |
| 583 | const char *name, const char *channel_name); |
| 584 | |
| 585 | /* |
| 586 | * Disable channel. |
| 587 | * |
| 588 | */ |
| 589 | extern int lttng_disable_channel(struct lttng_handle *handle, |
| 590 | const char *name); |
| 591 | |
| 592 | /* |
| 593 | * Calibrate LTTng overhead. |
| 594 | * |
| 595 | * The chan and handle params can not be NULL. |
| 596 | */ |
| 597 | extern int lttng_calibrate(struct lttng_handle *handle, |
| 598 | struct lttng_calibrate *calibrate); |
| 599 | |
| 600 | /* |
| 601 | * Set the default channel attributes for a specific domain and an allocated |
| 602 | * lttng_channel_attr pointer. |
| 603 | * |
| 604 | * If one or both arguments are NULL, nothing happens. |
| 605 | */ |
| 606 | extern void lttng_channel_set_default_attr(struct lttng_domain *domain, |
| 607 | struct lttng_channel_attr *attr); |
| 608 | |
| 609 | /* |
| 610 | * Set URL for a consumer for a session and domain. |
| 611 | * |
| 612 | * Both data and control URL must be defined. If both URLs are the same, only |
| 613 | * the control URL is used even for network streaming. |
| 614 | * |
| 615 | * Default port are 5342 and 5343 respectively for control and data which uses |
| 616 | * the TCP protocol. |
| 617 | */ |
| 618 | extern int lttng_set_consumer_url(struct lttng_handle *handle, |
| 619 | const char *control_url, const char *data_url); |
| 620 | |
| 621 | /* |
| 622 | * Enable the consumer for a session and domain. |
| 623 | */ |
| 624 | extern LTTNG_DEPRECATED("This call is now obsolete.") |
| 625 | int lttng_enable_consumer(struct lttng_handle *handle); |
| 626 | |
| 627 | /* |
| 628 | * Disable consumer for a session and domain. |
| 629 | */ |
| 630 | extern LTTNG_DEPRECATED("This call is now obsolete.") |
| 631 | int lttng_disable_consumer(struct lttng_handle *handle); |
| 632 | |
| 633 | /* |
| 634 | * Check session daemon health for a specific component. |
| 635 | * |
| 636 | * Return 0 if health is OK or 1 if BAD. A returned value of -1 indicate that |
| 637 | * the control library was not able to connect to the session daemon health |
| 638 | * socket. |
| 639 | * |
| 640 | * Any other positive value is an lttcomm error which can be translate with |
| 641 | * lttng_strerror(). |
| 642 | * |
| 643 | * Please see lttng-health-check(3) man page for more information. |
| 644 | */ |
| 645 | extern int lttng_health_check(enum lttng_health_component c); |
| 646 | |
| 647 | /* |
| 648 | * For a given session name, this call checks if the data is ready to be read |
| 649 | * or is still being extracted by the consumer(s) (pending) hence not ready to |
| 650 | * be used by any readers. |
| 651 | * |
| 652 | * Return 0 if there is _no_ data pending in the buffers thus having a |
| 653 | * guarantee that the data can be read safely. Else, return 1 if there is still |
| 654 | * traced data is pending. On error, a negative value is returned and readable |
| 655 | * by lttng_strerror(). |
| 656 | */ |
| 657 | extern int lttng_data_pending(const char *session_name); |
| 658 | |
| 659 | #ifdef __cplusplus |
| 660 | } |
| 661 | #endif |
| 662 | |
| 663 | #endif /* LTTNG_H */ |