| 1 | /* |
| 2 | * liblttngctl.c |
| 3 | * |
| 4 | * Linux Trace Toolkit Control Library |
| 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, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License 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 | #define _GNU_SOURCE |
| 23 | #include <grp.h> |
| 24 | #include <errno.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <unistd.h> |
| 29 | |
| 30 | #include <common/common.h> |
| 31 | #include <common/defaults.h> |
| 32 | #include <common/sessiond-comm/sessiond-comm.h> |
| 33 | #include <lttng/lttng.h> |
| 34 | |
| 35 | #include "filter-parser.h" |
| 36 | #include "filter-ast.h" |
| 37 | #include "filter-bytecode.h" |
| 38 | #include "memstream.h" |
| 39 | |
| 40 | #ifdef DEBUG |
| 41 | const int print_xml = 1; |
| 42 | #define dbg_printf(fmt, args...) \ |
| 43 | printf("[debug liblttng-ctl] " fmt, ## args) |
| 44 | #else |
| 45 | const int print_xml = 0; |
| 46 | #define dbg_printf(fmt, args...) \ |
| 47 | do { \ |
| 48 | /* do nothing but check printf format */ \ |
| 49 | if (0) \ |
| 50 | printf("[debug liblttnctl] " fmt, ## args); \ |
| 51 | } while (0) |
| 52 | #endif |
| 53 | |
| 54 | |
| 55 | /* Socket to session daemon for communication */ |
| 56 | static int sessiond_socket; |
| 57 | static char sessiond_sock_path[PATH_MAX]; |
| 58 | |
| 59 | /* Variables */ |
| 60 | static char *tracing_group; |
| 61 | static int connected; |
| 62 | |
| 63 | /* Global */ |
| 64 | |
| 65 | /* |
| 66 | * Those two variables are used by error.h to silent or control the verbosity of |
| 67 | * error message. They are global to the library so application linking with it |
| 68 | * are able to compile correctly and also control verbosity of the library. |
| 69 | * |
| 70 | * Note that it is *not* possible to silent ERR() and PERROR() macros. |
| 71 | */ |
| 72 | int lttng_opt_quiet; |
| 73 | int lttng_opt_verbose; |
| 74 | |
| 75 | /* |
| 76 | * Copy string from src to dst and enforce null terminated byte. |
| 77 | */ |
| 78 | static void copy_string(char *dst, const char *src, size_t len) |
| 79 | { |
| 80 | if (src && dst) { |
| 81 | strncpy(dst, src, len); |
| 82 | /* Enforce the NULL terminated byte */ |
| 83 | dst[len - 1] = '\0'; |
| 84 | } else if (dst) { |
| 85 | dst[0] = '\0'; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Copy domain to lttcomm_session_msg domain. |
| 91 | * |
| 92 | * If domain is unknown, default domain will be the kernel. |
| 93 | */ |
| 94 | static void copy_lttng_domain(struct lttng_domain *dst, struct lttng_domain *src) |
| 95 | { |
| 96 | if (src && dst) { |
| 97 | switch (src->type) { |
| 98 | case LTTNG_DOMAIN_KERNEL: |
| 99 | case LTTNG_DOMAIN_UST: |
| 100 | /* |
| 101 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 102 | case LTTNG_DOMAIN_UST_PID: |
| 103 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 104 | */ |
| 105 | memcpy(dst, src, sizeof(struct lttng_domain)); |
| 106 | break; |
| 107 | default: |
| 108 | memset(dst, 0, sizeof(struct lttng_domain)); |
| 109 | dst->type = LTTNG_DOMAIN_KERNEL; |
| 110 | break; |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | * Send lttcomm_session_msg to the session daemon. |
| 117 | * |
| 118 | * On success, returns the number of bytes sent (>=0) |
| 119 | * On error, returns -1 |
| 120 | */ |
| 121 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
| 122 | { |
| 123 | int ret; |
| 124 | |
| 125 | if (!connected) { |
| 126 | ret = -ENOTCONN; |
| 127 | goto end; |
| 128 | } |
| 129 | |
| 130 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
| 131 | sizeof(struct lttcomm_session_msg)); |
| 132 | |
| 133 | end: |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Send var len data to the session daemon. |
| 139 | * |
| 140 | * On success, returns the number of bytes sent (>=0) |
| 141 | * On error, returns -1 |
| 142 | */ |
| 143 | static int send_session_varlen(void *data, size_t len) |
| 144 | { |
| 145 | int ret; |
| 146 | |
| 147 | if (!connected) { |
| 148 | ret = -ENOTCONN; |
| 149 | goto end; |
| 150 | } |
| 151 | if (!data || !len) { |
| 152 | ret = 0; |
| 153 | goto end; |
| 154 | } |
| 155 | |
| 156 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); |
| 157 | |
| 158 | end: |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Receive data from the sessiond socket. |
| 164 | * |
| 165 | * On success, returns the number of bytes received (>=0) |
| 166 | * On error, returns -1 (recvmsg() error) or -ENOTCONN |
| 167 | */ |
| 168 | static int recv_data_sessiond(void *buf, size_t len) |
| 169 | { |
| 170 | int ret; |
| 171 | |
| 172 | if (!connected) { |
| 173 | ret = -ENOTCONN; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
| 178 | |
| 179 | end: |
| 180 | return ret; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Check if we are in the specified group. |
| 185 | * |
| 186 | * If yes return 1, else return -1. |
| 187 | */ |
| 188 | static int check_tracing_group(const char *grp_name) |
| 189 | { |
| 190 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ |
| 191 | gid_t *grp_list; |
| 192 | int grp_list_size, grp_id, i; |
| 193 | int ret = -1; |
| 194 | |
| 195 | /* Get GID of group 'tracing' */ |
| 196 | grp_tracing = getgrnam(grp_name); |
| 197 | if (!grp_tracing) { |
| 198 | /* If grp_tracing is NULL, the group does not exist. */ |
| 199 | goto end; |
| 200 | } |
| 201 | |
| 202 | /* Get number of supplementary group IDs */ |
| 203 | grp_list_size = getgroups(0, NULL); |
| 204 | if (grp_list_size < 0) { |
| 205 | perror("getgroups"); |
| 206 | goto end; |
| 207 | } |
| 208 | |
| 209 | /* Alloc group list of the right size */ |
| 210 | grp_list = malloc(grp_list_size * sizeof(gid_t)); |
| 211 | if (!grp_list) { |
| 212 | perror("malloc"); |
| 213 | goto end; |
| 214 | } |
| 215 | grp_id = getgroups(grp_list_size, grp_list); |
| 216 | if (grp_id < 0) { |
| 217 | perror("getgroups"); |
| 218 | goto free_list; |
| 219 | } |
| 220 | |
| 221 | for (i = 0; i < grp_list_size; i++) { |
| 222 | if (grp_list[i] == grp_tracing->gr_gid) { |
| 223 | ret = 1; |
| 224 | break; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | free_list: |
| 229 | free(grp_list); |
| 230 | |
| 231 | end: |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Try connect to session daemon with sock_path. |
| 237 | * |
| 238 | * Return 0 on success, else -1 |
| 239 | */ |
| 240 | static int try_connect_sessiond(const char *sock_path) |
| 241 | { |
| 242 | int ret; |
| 243 | |
| 244 | /* If socket exist, we check if the daemon listens for connect. */ |
| 245 | ret = access(sock_path, F_OK); |
| 246 | if (ret < 0) { |
| 247 | /* Not alive */ |
| 248 | return -1; |
| 249 | } |
| 250 | |
| 251 | ret = lttcomm_connect_unix_sock(sock_path); |
| 252 | if (ret < 0) { |
| 253 | /* Not alive */ |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | ret = lttcomm_close_unix_sock(ret); |
| 258 | if (ret < 0) { |
| 259 | perror("lttcomm_close_unix_sock"); |
| 260 | } |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Set sessiond socket path by putting it in the global |
| 267 | * sessiond_sock_path variable. |
| 268 | * Returns 0 on success, |
| 269 | * -ENOMEM on failure (the sessiond socket path is somehow too long) |
| 270 | */ |
| 271 | static int set_session_daemon_path(void) |
| 272 | { |
| 273 | int ret; |
| 274 | int in_tgroup = 0; /* In tracing group */ |
| 275 | uid_t uid; |
| 276 | |
| 277 | uid = getuid(); |
| 278 | |
| 279 | if (uid != 0) { |
| 280 | /* Are we in the tracing group ? */ |
| 281 | in_tgroup = check_tracing_group(tracing_group); |
| 282 | } |
| 283 | |
| 284 | if ((uid == 0) || in_tgroup) { |
| 285 | copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, |
| 286 | sizeof(sessiond_sock_path)); |
| 287 | } |
| 288 | |
| 289 | if (uid != 0) { |
| 290 | if (in_tgroup) { |
| 291 | /* Tracing group */ |
| 292 | ret = try_connect_sessiond(sessiond_sock_path); |
| 293 | if (ret >= 0) { |
| 294 | goto end; |
| 295 | } |
| 296 | /* Global session daemon not available... */ |
| 297 | } |
| 298 | /* ...or not in tracing group (and not root), default */ |
| 299 | |
| 300 | /* |
| 301 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; |
| 302 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) |
| 303 | */ |
| 304 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), |
| 305 | DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME")); |
| 306 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
| 307 | return -ENOMEM; |
| 308 | } |
| 309 | } |
| 310 | end: |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Connect to the LTTng session daemon. |
| 316 | * |
| 317 | * On success, return 0. On error, return -1. |
| 318 | */ |
| 319 | static int connect_sessiond(void) |
| 320 | { |
| 321 | int ret; |
| 322 | |
| 323 | ret = set_session_daemon_path(); |
| 324 | if (ret < 0) { |
| 325 | return -1; /* set_session_daemon_path() returns -ENOMEM */ |
| 326 | } |
| 327 | |
| 328 | /* Connect to the sesssion daemon */ |
| 329 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); |
| 330 | if (ret < 0) { |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | sessiond_socket = ret; |
| 335 | connected = 1; |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Clean disconnect from the session daemon. |
| 342 | * On success, return 0. On error, return -1. |
| 343 | */ |
| 344 | static int disconnect_sessiond(void) |
| 345 | { |
| 346 | int ret = 0; |
| 347 | |
| 348 | if (connected) { |
| 349 | ret = lttcomm_close_unix_sock(sessiond_socket); |
| 350 | sessiond_socket = 0; |
| 351 | connected = 0; |
| 352 | } |
| 353 | |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Ask the session daemon a specific command and put the data into buf. |
| 359 | * Takes extra var. len. data as input to send to the session daemon. |
| 360 | * |
| 361 | * Return size of data (only payload, not header) or a negative error code. |
| 362 | */ |
| 363 | static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm, |
| 364 | void *vardata, |
| 365 | size_t varlen, |
| 366 | void **buf) |
| 367 | { |
| 368 | int ret; |
| 369 | size_t size; |
| 370 | void *data = NULL; |
| 371 | struct lttcomm_lttng_msg llm; |
| 372 | |
| 373 | ret = connect_sessiond(); |
| 374 | if (ret < 0) { |
| 375 | goto end; |
| 376 | } |
| 377 | |
| 378 | /* Send command to session daemon */ |
| 379 | ret = send_session_msg(lsm); |
| 380 | if (ret < 0) { |
| 381 | goto end; |
| 382 | } |
| 383 | /* Send var len data */ |
| 384 | ret = send_session_varlen(vardata, varlen); |
| 385 | if (ret < 0) { |
| 386 | goto end; |
| 387 | } |
| 388 | |
| 389 | /* Get header from data transmission */ |
| 390 | ret = recv_data_sessiond(&llm, sizeof(llm)); |
| 391 | if (ret < 0) { |
| 392 | goto end; |
| 393 | } |
| 394 | |
| 395 | /* Check error code if OK */ |
| 396 | if (llm.ret_code != LTTCOMM_OK) { |
| 397 | ret = -llm.ret_code; |
| 398 | goto end; |
| 399 | } |
| 400 | |
| 401 | size = llm.data_size; |
| 402 | if (size == 0) { |
| 403 | /* If client free with size 0 */ |
| 404 | if (buf != NULL) { |
| 405 | *buf = NULL; |
| 406 | } |
| 407 | ret = 0; |
| 408 | goto end; |
| 409 | } |
| 410 | |
| 411 | data = (void*) malloc(size); |
| 412 | |
| 413 | /* Get payload data */ |
| 414 | ret = recv_data_sessiond(data, size); |
| 415 | if (ret < 0) { |
| 416 | free(data); |
| 417 | goto end; |
| 418 | } |
| 419 | |
| 420 | /* |
| 421 | * Extra protection not to dereference a NULL pointer. If buf is NULL at |
| 422 | * this point, an error is returned and data is freed. |
| 423 | */ |
| 424 | if (buf == NULL) { |
| 425 | ret = -1; |
| 426 | free(data); |
| 427 | goto end; |
| 428 | } |
| 429 | |
| 430 | *buf = data; |
| 431 | ret = size; |
| 432 | |
| 433 | end: |
| 434 | disconnect_sessiond(); |
| 435 | return ret; |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Ask the session daemon a specific command and put the data into buf. |
| 440 | * |
| 441 | * Return size of data (only payload, not header) or a negative error code. |
| 442 | */ |
| 443 | static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf) |
| 444 | { |
| 445 | return ask_sessiond_varlen(lsm, NULL, 0, buf); |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Create lttng handle and return pointer. |
| 450 | * The returned pointer will be NULL in case of malloc() error. |
| 451 | */ |
| 452 | struct lttng_handle *lttng_create_handle(const char *session_name, |
| 453 | struct lttng_domain *domain) |
| 454 | { |
| 455 | struct lttng_handle *handle; |
| 456 | |
| 457 | handle = malloc(sizeof(struct lttng_handle)); |
| 458 | if (handle == NULL) { |
| 459 | perror("malloc handle"); |
| 460 | goto end; |
| 461 | } |
| 462 | |
| 463 | /* Copy session name */ |
| 464 | copy_string(handle->session_name, session_name, |
| 465 | sizeof(handle->session_name)); |
| 466 | |
| 467 | /* Copy lttng domain */ |
| 468 | copy_lttng_domain(&handle->domain, domain); |
| 469 | |
| 470 | end: |
| 471 | return handle; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Destroy handle by free(3) the pointer. |
| 476 | */ |
| 477 | void lttng_destroy_handle(struct lttng_handle *handle) |
| 478 | { |
| 479 | if (handle) { |
| 480 | free(handle); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Register an outside consumer. |
| 486 | * Returns size of returned session payload data or a negative error code. |
| 487 | */ |
| 488 | int lttng_register_consumer(struct lttng_handle *handle, |
| 489 | const char *socket_path) |
| 490 | { |
| 491 | struct lttcomm_session_msg lsm; |
| 492 | |
| 493 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
| 494 | copy_string(lsm.session.name, handle->session_name, |
| 495 | sizeof(lsm.session.name)); |
| 496 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 497 | |
| 498 | copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
| 499 | |
| 500 | return ask_sessiond(&lsm, NULL); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Start tracing for all traces of the session. |
| 505 | * Returns size of returned session payload data or a negative error code. |
| 506 | */ |
| 507 | int lttng_start_tracing(const char *session_name) |
| 508 | { |
| 509 | struct lttcomm_session_msg lsm; |
| 510 | |
| 511 | if (session_name == NULL) { |
| 512 | return -1; |
| 513 | } |
| 514 | |
| 515 | lsm.cmd_type = LTTNG_START_TRACE; |
| 516 | |
| 517 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
| 518 | |
| 519 | return ask_sessiond(&lsm, NULL); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Stop tracing for all traces of the session. |
| 524 | * Returns size of returned session payload data or a negative error code. |
| 525 | */ |
| 526 | int lttng_stop_tracing(const char *session_name) |
| 527 | { |
| 528 | struct lttcomm_session_msg lsm; |
| 529 | |
| 530 | if (session_name == NULL) { |
| 531 | return -1; |
| 532 | } |
| 533 | |
| 534 | lsm.cmd_type = LTTNG_STOP_TRACE; |
| 535 | |
| 536 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
| 537 | |
| 538 | return ask_sessiond(&lsm, NULL); |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Add context to event and/or channel. |
| 543 | * If event_name is NULL, the context is applied to all events of the channel. |
| 544 | * If channel_name is NULL, a lookup of the event's channel is done. |
| 545 | * If both are NULL, the context is applied to all events of all channels. |
| 546 | * |
| 547 | * Returns the size of the returned payload data or a negative error code. |
| 548 | */ |
| 549 | int lttng_add_context(struct lttng_handle *handle, |
| 550 | struct lttng_event_context *ctx, const char *event_name, |
| 551 | const char *channel_name) |
| 552 | { |
| 553 | struct lttcomm_session_msg lsm; |
| 554 | |
| 555 | /* Safety check. Both are mandatory */ |
| 556 | if (handle == NULL || ctx == NULL) { |
| 557 | return -1; |
| 558 | } |
| 559 | |
| 560 | memset(&lsm, 0, sizeof(lsm)); |
| 561 | |
| 562 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
| 563 | |
| 564 | /* Copy channel name */ |
| 565 | copy_string(lsm.u.context.channel_name, channel_name, |
| 566 | sizeof(lsm.u.context.channel_name)); |
| 567 | /* Copy event name */ |
| 568 | copy_string(lsm.u.context.event_name, event_name, |
| 569 | sizeof(lsm.u.context.event_name)); |
| 570 | |
| 571 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 572 | |
| 573 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
| 574 | |
| 575 | copy_string(lsm.session.name, handle->session_name, |
| 576 | sizeof(lsm.session.name)); |
| 577 | |
| 578 | return ask_sessiond(&lsm, NULL); |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Enable event(s) for a channel. |
| 583 | * If no event name is specified, all events are enabled. |
| 584 | * If no channel name is specified, the default 'channel0' is used. |
| 585 | * Returns size of returned session payload data or a negative error code. |
| 586 | */ |
| 587 | int lttng_enable_event(struct lttng_handle *handle, |
| 588 | struct lttng_event *ev, const char *channel_name) |
| 589 | { |
| 590 | struct lttcomm_session_msg lsm; |
| 591 | |
| 592 | if (handle == NULL || ev == NULL) { |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | memset(&lsm, 0, sizeof(lsm)); |
| 597 | |
| 598 | /* If no channel name, we put the default name */ |
| 599 | if (channel_name == NULL) { |
| 600 | copy_string(lsm.u.enable.channel_name, DEFAULT_CHANNEL_NAME, |
| 601 | sizeof(lsm.u.enable.channel_name)); |
| 602 | } else { |
| 603 | copy_string(lsm.u.enable.channel_name, channel_name, |
| 604 | sizeof(lsm.u.enable.channel_name)); |
| 605 | } |
| 606 | |
| 607 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 608 | |
| 609 | if (ev->name[0] != '\0') { |
| 610 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
| 611 | } else { |
| 612 | lsm.cmd_type = LTTNG_ENABLE_ALL_EVENT; |
| 613 | } |
| 614 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
| 615 | |
| 616 | copy_string(lsm.session.name, handle->session_name, |
| 617 | sizeof(lsm.session.name)); |
| 618 | |
| 619 | return ask_sessiond(&lsm, NULL); |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * set filter for an event |
| 624 | * Return negative error value on error. |
| 625 | * Return size of returned session payload data if OK. |
| 626 | */ |
| 627 | |
| 628 | int lttng_set_event_filter(struct lttng_handle *handle, |
| 629 | const char *event_name, const char *channel_name, |
| 630 | const char *filter_expression) |
| 631 | { |
| 632 | struct lttcomm_session_msg lsm; |
| 633 | struct filter_parser_ctx *ctx; |
| 634 | FILE *fmem; |
| 635 | int ret = 0; |
| 636 | |
| 637 | /* Safety check. */ |
| 638 | if (handle == NULL) { |
| 639 | return -1; |
| 640 | } |
| 641 | |
| 642 | if (!filter_expression) { |
| 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * casting const to non-const, as the underlying function will |
| 648 | * use it in read-only mode. |
| 649 | */ |
| 650 | fmem = lttng_fmemopen((void *) filter_expression, |
| 651 | strlen(filter_expression), "r"); |
| 652 | if (!fmem) { |
| 653 | fprintf(stderr, "Error opening memory as stream\n"); |
| 654 | return -ENOMEM; |
| 655 | } |
| 656 | ctx = filter_parser_ctx_alloc(fmem); |
| 657 | if (!ctx) { |
| 658 | fprintf(stderr, "Error allocating parser\n"); |
| 659 | ret = -ENOMEM; |
| 660 | goto alloc_error; |
| 661 | } |
| 662 | ret = filter_parser_ctx_append_ast(ctx); |
| 663 | if (ret) { |
| 664 | fprintf(stderr, "Parse error\n"); |
| 665 | ret = -EINVAL; |
| 666 | goto parse_error; |
| 667 | } |
| 668 | ret = filter_visitor_set_parent(ctx); |
| 669 | if (ret) { |
| 670 | fprintf(stderr, "Set parent error\n"); |
| 671 | ret = -EINVAL; |
| 672 | goto parse_error; |
| 673 | } |
| 674 | if (print_xml) { |
| 675 | ret = filter_visitor_print_xml(ctx, stdout, 0); |
| 676 | if (ret) { |
| 677 | fflush(stdout); |
| 678 | fprintf(stderr, "XML print error\n"); |
| 679 | ret = -EINVAL; |
| 680 | goto parse_error; |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | dbg_printf("Generating IR... "); |
| 685 | fflush(stdout); |
| 686 | ret = filter_visitor_ir_generate(ctx); |
| 687 | if (ret) { |
| 688 | fprintf(stderr, "Generate IR error\n"); |
| 689 | ret = -EINVAL; |
| 690 | goto parse_error; |
| 691 | } |
| 692 | dbg_printf("done\n"); |
| 693 | |
| 694 | dbg_printf("Validating IR... "); |
| 695 | fflush(stdout); |
| 696 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); |
| 697 | if (ret) { |
| 698 | ret = -EINVAL; |
| 699 | goto parse_error; |
| 700 | } |
| 701 | dbg_printf("done\n"); |
| 702 | |
| 703 | dbg_printf("Generating bytecode... "); |
| 704 | fflush(stdout); |
| 705 | ret = filter_visitor_bytecode_generate(ctx); |
| 706 | if (ret) { |
| 707 | fprintf(stderr, "Generate bytecode error\n"); |
| 708 | ret = -EINVAL; |
| 709 | goto parse_error; |
| 710 | } |
| 711 | dbg_printf("done\n"); |
| 712 | dbg_printf("Size of bytecode generated: %u bytes.\n", |
| 713 | bytecode_get_len(&ctx->bytecode->b)); |
| 714 | |
| 715 | memset(&lsm, 0, sizeof(lsm)); |
| 716 | |
| 717 | lsm.cmd_type = LTTNG_SET_FILTER; |
| 718 | |
| 719 | /* Copy channel name */ |
| 720 | copy_string(lsm.u.filter.channel_name, channel_name, |
| 721 | sizeof(lsm.u.filter.channel_name)); |
| 722 | /* Copy event name */ |
| 723 | copy_string(lsm.u.filter.event_name, event_name, |
| 724 | sizeof(lsm.u.filter.event_name)); |
| 725 | lsm.u.filter.bytecode_len = sizeof(ctx->bytecode->b) |
| 726 | + bytecode_get_len(&ctx->bytecode->b); |
| 727 | |
| 728 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 729 | |
| 730 | copy_string(lsm.session.name, handle->session_name, |
| 731 | sizeof(lsm.session.name)); |
| 732 | |
| 733 | ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b, |
| 734 | lsm.u.filter.bytecode_len, NULL); |
| 735 | |
| 736 | filter_bytecode_free(ctx); |
| 737 | filter_ir_free(ctx); |
| 738 | filter_parser_ctx_free(ctx); |
| 739 | if (fclose(fmem) != 0) { |
| 740 | perror("fclose"); |
| 741 | } |
| 742 | return ret; |
| 743 | |
| 744 | parse_error: |
| 745 | filter_bytecode_free(ctx); |
| 746 | filter_ir_free(ctx); |
| 747 | filter_parser_ctx_free(ctx); |
| 748 | alloc_error: |
| 749 | if (fclose(fmem) != 0) { |
| 750 | perror("fclose"); |
| 751 | } |
| 752 | return ret; |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * Disable event(s) of a channel and domain. |
| 757 | * If no event name is specified, all events are disabled. |
| 758 | * If no channel name is specified, the default 'channel0' is used. |
| 759 | * Returns size of returned session payload data or a negative error code. |
| 760 | */ |
| 761 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
| 762 | const char *channel_name) |
| 763 | { |
| 764 | struct lttcomm_session_msg lsm; |
| 765 | |
| 766 | if (handle == NULL) { |
| 767 | return -1; |
| 768 | } |
| 769 | |
| 770 | memset(&lsm, 0, sizeof(lsm)); |
| 771 | |
| 772 | if (channel_name) { |
| 773 | copy_string(lsm.u.disable.channel_name, channel_name, |
| 774 | sizeof(lsm.u.disable.channel_name)); |
| 775 | } else { |
| 776 | copy_string(lsm.u.disable.channel_name, DEFAULT_CHANNEL_NAME, |
| 777 | sizeof(lsm.u.disable.channel_name)); |
| 778 | } |
| 779 | |
| 780 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 781 | |
| 782 | if (name != NULL) { |
| 783 | copy_string(lsm.u.disable.name, name, sizeof(lsm.u.disable.name)); |
| 784 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
| 785 | } else { |
| 786 | lsm.cmd_type = LTTNG_DISABLE_ALL_EVENT; |
| 787 | } |
| 788 | |
| 789 | copy_string(lsm.session.name, handle->session_name, |
| 790 | sizeof(lsm.session.name)); |
| 791 | |
| 792 | return ask_sessiond(&lsm, NULL); |
| 793 | } |
| 794 | |
| 795 | /* |
| 796 | * Enable channel per domain |
| 797 | * Returns size of returned session payload data or a negative error code. |
| 798 | */ |
| 799 | int lttng_enable_channel(struct lttng_handle *handle, |
| 800 | struct lttng_channel *chan) |
| 801 | { |
| 802 | struct lttcomm_session_msg lsm; |
| 803 | |
| 804 | /* |
| 805 | * NULL arguments are forbidden. No default values. |
| 806 | */ |
| 807 | if (handle == NULL || chan == NULL) { |
| 808 | return -1; |
| 809 | } |
| 810 | |
| 811 | memset(&lsm, 0, sizeof(lsm)); |
| 812 | |
| 813 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
| 814 | |
| 815 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
| 816 | |
| 817 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 818 | |
| 819 | copy_string(lsm.session.name, handle->session_name, |
| 820 | sizeof(lsm.session.name)); |
| 821 | |
| 822 | return ask_sessiond(&lsm, NULL); |
| 823 | } |
| 824 | |
| 825 | /* |
| 826 | * All tracing will be stopped for registered events of the channel. |
| 827 | * Returns size of returned session payload data or a negative error code. |
| 828 | */ |
| 829 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
| 830 | { |
| 831 | struct lttcomm_session_msg lsm; |
| 832 | |
| 833 | /* Safety check. Both are mandatory */ |
| 834 | if (handle == NULL || name == NULL) { |
| 835 | return -1; |
| 836 | } |
| 837 | |
| 838 | memset(&lsm, 0, sizeof(lsm)); |
| 839 | |
| 840 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
| 841 | |
| 842 | copy_string(lsm.u.disable.channel_name, name, |
| 843 | sizeof(lsm.u.disable.channel_name)); |
| 844 | |
| 845 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 846 | |
| 847 | copy_string(lsm.session.name, handle->session_name, |
| 848 | sizeof(lsm.session.name)); |
| 849 | |
| 850 | return ask_sessiond(&lsm, NULL); |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Lists all available tracepoints of domain. |
| 855 | * Sets the contents of the events array. |
| 856 | * Returns the number of lttng_event entries in events; |
| 857 | * on error, returns a negative value. |
| 858 | */ |
| 859 | int lttng_list_tracepoints(struct lttng_handle *handle, |
| 860 | struct lttng_event **events) |
| 861 | { |
| 862 | int ret; |
| 863 | struct lttcomm_session_msg lsm; |
| 864 | |
| 865 | if (handle == NULL) { |
| 866 | return -1; |
| 867 | } |
| 868 | |
| 869 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
| 870 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 871 | |
| 872 | ret = ask_sessiond(&lsm, (void **) events); |
| 873 | if (ret < 0) { |
| 874 | return ret; |
| 875 | } |
| 876 | |
| 877 | return ret / sizeof(struct lttng_event); |
| 878 | } |
| 879 | |
| 880 | /* |
| 881 | * Lists all available tracepoint fields of domain. |
| 882 | * Sets the contents of the event field array. |
| 883 | * Returns the number of lttng_event_field entries in events; |
| 884 | * on error, returns a negative value. |
| 885 | */ |
| 886 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, |
| 887 | struct lttng_event_field **fields) |
| 888 | { |
| 889 | int ret; |
| 890 | struct lttcomm_session_msg lsm; |
| 891 | |
| 892 | if (handle == NULL) { |
| 893 | return -1; |
| 894 | } |
| 895 | |
| 896 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
| 897 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 898 | |
| 899 | ret = ask_sessiond(&lsm, (void **) fields); |
| 900 | if (ret < 0) { |
| 901 | return ret; |
| 902 | } |
| 903 | |
| 904 | return ret / sizeof(struct lttng_event_field); |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Returns a human readable string describing |
| 909 | * the error code (a negative value). |
| 910 | */ |
| 911 | const char *lttng_strerror(int code) |
| 912 | { |
| 913 | /* lttcomm error codes range from -LTTCOMM_OK down to -LTTCOMM_NR */ |
| 914 | if (code > -LTTCOMM_OK) { |
| 915 | return "Ended with errors"; |
| 916 | } |
| 917 | |
| 918 | return lttcomm_get_readable_code(code); |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * Create a brand new session using name and path. |
| 923 | * Returns size of returned session payload data or a negative error code. |
| 924 | */ |
| 925 | int lttng_create_session(const char *name, const char *path) |
| 926 | { |
| 927 | struct lttcomm_session_msg lsm; |
| 928 | |
| 929 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
| 930 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 931 | copy_string(lsm.session.path, path, sizeof(lsm.session.path)); |
| 932 | |
| 933 | return ask_sessiond(&lsm, NULL); |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * Create a new tracing session using a name, URIs and a consumer enable flag. |
| 938 | */ |
| 939 | int lttng_create_session_uri(const char *name, struct lttng_uri *ctrl_uri, |
| 940 | struct lttng_uri *data_uri, unsigned int enable_consumer) |
| 941 | { |
| 942 | struct lttcomm_session_msg lsm; |
| 943 | |
| 944 | /* Name and ctrl_uri are mandatory */ |
| 945 | if (name == NULL || ctrl_uri == NULL) { |
| 946 | return -1; |
| 947 | } |
| 948 | |
| 949 | lsm.cmd_type = LTTNG_CREATE_SESSION_URI; |
| 950 | |
| 951 | copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 952 | /* Anything bigger than zero, the consumer(s) will be enabled */ |
| 953 | lsm.u.create_uri.enable_consumer = enable_consumer; |
| 954 | memcpy(&lsm.u.create_uri.ctrl_uri, ctrl_uri, |
| 955 | sizeof(lsm.u.create_uri.ctrl_uri)); |
| 956 | if (data_uri) { |
| 957 | /* |
| 958 | * The only possible scenario where data_uri is NULL is for a local |
| 959 | * consumer where the output is at a specified path name on the |
| 960 | * filesystem. |
| 961 | */ |
| 962 | memcpy(&lsm.u.create_uri.data_uri, data_uri, |
| 963 | sizeof(lsm.u.create_uri.data_uri)); |
| 964 | } |
| 965 | |
| 966 | return ask_sessiond(&lsm, NULL); |
| 967 | } |
| 968 | |
| 969 | /* |
| 970 | * Destroy session using name. |
| 971 | * Returns size of returned session payload data or a negative error code. |
| 972 | */ |
| 973 | int lttng_destroy_session(const char *session_name) |
| 974 | { |
| 975 | struct lttcomm_session_msg lsm; |
| 976 | |
| 977 | if (session_name == NULL) { |
| 978 | return -1; |
| 979 | } |
| 980 | |
| 981 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
| 982 | |
| 983 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
| 984 | |
| 985 | return ask_sessiond(&lsm, NULL); |
| 986 | } |
| 987 | |
| 988 | /* |
| 989 | * Ask the session daemon for all available sessions. |
| 990 | * Sets the contents of the sessions array. |
| 991 | * Returns the number of lttng_session entries in sessions; |
| 992 | * on error, returns a negative value. |
| 993 | */ |
| 994 | int lttng_list_sessions(struct lttng_session **sessions) |
| 995 | { |
| 996 | int ret; |
| 997 | struct lttcomm_session_msg lsm; |
| 998 | |
| 999 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
| 1000 | ret = ask_sessiond(&lsm, (void**) sessions); |
| 1001 | if (ret < 0) { |
| 1002 | return ret; |
| 1003 | } |
| 1004 | |
| 1005 | return ret / sizeof(struct lttng_session); |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Ask the session daemon for all available domains of a session. |
| 1010 | * Sets the contents of the domains array. |
| 1011 | * Returns the number of lttng_domain entries in domains; |
| 1012 | * on error, returns a negative value. |
| 1013 | */ |
| 1014 | int lttng_list_domains(const char *session_name, |
| 1015 | struct lttng_domain **domains) |
| 1016 | { |
| 1017 | int ret; |
| 1018 | struct lttcomm_session_msg lsm; |
| 1019 | |
| 1020 | if (session_name == NULL) { |
| 1021 | return -1; |
| 1022 | } |
| 1023 | |
| 1024 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
| 1025 | |
| 1026 | copy_string(lsm.session.name, session_name, sizeof(lsm.session.name)); |
| 1027 | |
| 1028 | ret = ask_sessiond(&lsm, (void**) domains); |
| 1029 | if (ret < 0) { |
| 1030 | return ret; |
| 1031 | } |
| 1032 | |
| 1033 | return ret / sizeof(struct lttng_domain); |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Ask the session daemon for all available channels of a session. |
| 1038 | * Sets the contents of the channels array. |
| 1039 | * Returns the number of lttng_channel entries in channels; |
| 1040 | * on error, returns a negative value. |
| 1041 | */ |
| 1042 | int lttng_list_channels(struct lttng_handle *handle, |
| 1043 | struct lttng_channel **channels) |
| 1044 | { |
| 1045 | int ret; |
| 1046 | struct lttcomm_session_msg lsm; |
| 1047 | |
| 1048 | if (handle == NULL) { |
| 1049 | return -1; |
| 1050 | } |
| 1051 | |
| 1052 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
| 1053 | copy_string(lsm.session.name, handle->session_name, |
| 1054 | sizeof(lsm.session.name)); |
| 1055 | |
| 1056 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1057 | |
| 1058 | ret = ask_sessiond(&lsm, (void**) channels); |
| 1059 | if (ret < 0) { |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
| 1063 | return ret / sizeof(struct lttng_channel); |
| 1064 | } |
| 1065 | |
| 1066 | /* |
| 1067 | * Ask the session daemon for all available events of a session channel. |
| 1068 | * Sets the contents of the events array. |
| 1069 | * Returns the number of lttng_event entries in events; |
| 1070 | * on error, returns a negative value. |
| 1071 | */ |
| 1072 | int lttng_list_events(struct lttng_handle *handle, |
| 1073 | const char *channel_name, struct lttng_event **events) |
| 1074 | { |
| 1075 | int ret; |
| 1076 | struct lttcomm_session_msg lsm; |
| 1077 | |
| 1078 | /* Safety check. An handle and channel name are mandatory */ |
| 1079 | if (handle == NULL || channel_name == NULL) { |
| 1080 | return -1; |
| 1081 | } |
| 1082 | |
| 1083 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
| 1084 | copy_string(lsm.session.name, handle->session_name, |
| 1085 | sizeof(lsm.session.name)); |
| 1086 | copy_string(lsm.u.list.channel_name, channel_name, |
| 1087 | sizeof(lsm.u.list.channel_name)); |
| 1088 | |
| 1089 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1090 | |
| 1091 | ret = ask_sessiond(&lsm, (void**) events); |
| 1092 | if (ret < 0) { |
| 1093 | return ret; |
| 1094 | } |
| 1095 | |
| 1096 | return ret / sizeof(struct lttng_event); |
| 1097 | } |
| 1098 | |
| 1099 | /* |
| 1100 | * Sets the tracing_group variable with name. |
| 1101 | * This function allocates memory pointed to by tracing_group. |
| 1102 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. |
| 1103 | */ |
| 1104 | int lttng_set_tracing_group(const char *name) |
| 1105 | { |
| 1106 | if (name == NULL) { |
| 1107 | return -1; |
| 1108 | } |
| 1109 | |
| 1110 | if (asprintf(&tracing_group, "%s", name) < 0) { |
| 1111 | return -ENOMEM; |
| 1112 | } |
| 1113 | |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * Returns size of returned session payload data or a negative error code. |
| 1119 | */ |
| 1120 | int lttng_calibrate(struct lttng_handle *handle, |
| 1121 | struct lttng_calibrate *calibrate) |
| 1122 | { |
| 1123 | struct lttcomm_session_msg lsm; |
| 1124 | |
| 1125 | /* Safety check. NULL pointer are forbidden */ |
| 1126 | if (handle == NULL || calibrate == NULL) { |
| 1127 | return -1; |
| 1128 | } |
| 1129 | |
| 1130 | lsm.cmd_type = LTTNG_CALIBRATE; |
| 1131 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1132 | |
| 1133 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
| 1134 | |
| 1135 | return ask_sessiond(&lsm, NULL); |
| 1136 | } |
| 1137 | |
| 1138 | /* |
| 1139 | * Set default channel attributes. |
| 1140 | * If either or both of the arguments are null, attr content is zeroe'd. |
| 1141 | */ |
| 1142 | void lttng_channel_set_default_attr(struct lttng_domain *domain, |
| 1143 | struct lttng_channel_attr *attr) |
| 1144 | { |
| 1145 | /* Safety check */ |
| 1146 | if (attr == NULL || domain == NULL) { |
| 1147 | return; |
| 1148 | } |
| 1149 | |
| 1150 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
| 1151 | |
| 1152 | switch (domain->type) { |
| 1153 | case LTTNG_DOMAIN_KERNEL: |
| 1154 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 1155 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
| 1156 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; |
| 1157 | |
| 1158 | attr->subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; |
| 1159 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
| 1160 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 1161 | break; |
| 1162 | case LTTNG_DOMAIN_UST: |
| 1163 | #if 0 |
| 1164 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 1165 | case LTTNG_DOMAIN_UST_PID: |
| 1166 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 1167 | #endif |
| 1168 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 1169 | attr->switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
| 1170 | attr->read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; |
| 1171 | |
| 1172 | attr->subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE; |
| 1173 | attr->num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM; |
| 1174 | attr->output = DEFAULT_UST_CHANNEL_OUTPUT; |
| 1175 | break; |
| 1176 | default: |
| 1177 | /* Default behavior: leave set to 0. */ |
| 1178 | break; |
| 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | /* |
| 1183 | * Check if session daemon is alive. |
| 1184 | * |
| 1185 | * Return 1 if alive or 0 if not. |
| 1186 | * On error returns a negative value. |
| 1187 | */ |
| 1188 | int lttng_session_daemon_alive(void) |
| 1189 | { |
| 1190 | int ret; |
| 1191 | |
| 1192 | ret = set_session_daemon_path(); |
| 1193 | if (ret < 0) { |
| 1194 | /* Error */ |
| 1195 | return ret; |
| 1196 | } |
| 1197 | |
| 1198 | if (strlen(sessiond_sock_path) == 0) { |
| 1199 | /* No socket path set. Weird error */ |
| 1200 | return -1; |
| 1201 | } |
| 1202 | |
| 1203 | ret = try_connect_sessiond(sessiond_sock_path); |
| 1204 | if (ret < 0) { |
| 1205 | /* Not alive */ |
| 1206 | return 0; |
| 1207 | } |
| 1208 | |
| 1209 | /* Is alive */ |
| 1210 | return 1; |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * Set URI for a consumer for a session and domain. |
| 1215 | * |
| 1216 | * Return 0 on success, else a negative value. |
| 1217 | */ |
| 1218 | int lttng_set_consumer_uri(struct lttng_handle *handle, struct lttng_uri *uri) |
| 1219 | { |
| 1220 | struct lttcomm_session_msg lsm; |
| 1221 | |
| 1222 | if (handle == NULL || uri == NULL) { |
| 1223 | return -1; |
| 1224 | } |
| 1225 | |
| 1226 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
| 1227 | |
| 1228 | copy_string(lsm.session.name, handle->session_name, |
| 1229 | sizeof(lsm.session.name)); |
| 1230 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1231 | |
| 1232 | memcpy(&lsm.u.uri, uri, sizeof(lsm.u.uri)); |
| 1233 | |
| 1234 | return ask_sessiond(&lsm, NULL); |
| 1235 | } |
| 1236 | |
| 1237 | /* |
| 1238 | * Enable consumer for a session and domain. |
| 1239 | * |
| 1240 | * Return 0 on success, else a negative value. |
| 1241 | */ |
| 1242 | int lttng_enable_consumer(struct lttng_handle *handle) |
| 1243 | { |
| 1244 | struct lttcomm_session_msg lsm; |
| 1245 | |
| 1246 | if (handle == NULL) { |
| 1247 | return -1; |
| 1248 | } |
| 1249 | |
| 1250 | lsm.cmd_type = LTTNG_ENABLE_CONSUMER; |
| 1251 | |
| 1252 | copy_string(lsm.session.name, handle->session_name, |
| 1253 | sizeof(lsm.session.name)); |
| 1254 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1255 | |
| 1256 | return ask_sessiond(&lsm, NULL); |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * Disable consumer for a session and domain. |
| 1261 | * |
| 1262 | * Return 0 on success, else a negative value. |
| 1263 | */ |
| 1264 | int lttng_disable_consumer(struct lttng_handle *handle) |
| 1265 | { |
| 1266 | struct lttcomm_session_msg lsm; |
| 1267 | |
| 1268 | if (handle == NULL) { |
| 1269 | return -1; |
| 1270 | } |
| 1271 | |
| 1272 | lsm.cmd_type = LTTNG_DISABLE_CONSUMER; |
| 1273 | |
| 1274 | copy_string(lsm.session.name, handle->session_name, |
| 1275 | sizeof(lsm.session.name)); |
| 1276 | copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1277 | |
| 1278 | return ask_sessiond(&lsm, NULL); |
| 1279 | } |
| 1280 | |
| 1281 | /* |
| 1282 | * lib constructor |
| 1283 | */ |
| 1284 | static void __attribute__((constructor)) init() |
| 1285 | { |
| 1286 | /* Set default session group */ |
| 1287 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
| 1288 | } |