| 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 | #define _LGPL_SOURCE |
| 24 | #include <assert.h> |
| 25 | #include <grp.h> |
| 26 | #include <errno.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <unistd.h> |
| 31 | |
| 32 | #include <common/common.h> |
| 33 | #include <common/defaults.h> |
| 34 | #include <common/sessiond-comm/sessiond-comm.h> |
| 35 | #include <common/uri.h> |
| 36 | #include <common/utils.h> |
| 37 | #include <lttng/lttng.h> |
| 38 | #include <lttng/health-internal.h> |
| 39 | |
| 40 | #include "filter/filter-ast.h" |
| 41 | #include "filter/filter-parser.h" |
| 42 | #include "filter/filter-bytecode.h" |
| 43 | #include "filter/memstream.h" |
| 44 | #include "lttng-ctl-helper.h" |
| 45 | |
| 46 | #ifdef DEBUG |
| 47 | static const int print_xml = 1; |
| 48 | #define dbg_printf(fmt, args...) \ |
| 49 | printf("[debug liblttng-ctl] " fmt, ## args) |
| 50 | #else |
| 51 | static const int print_xml = 0; |
| 52 | #define dbg_printf(fmt, args...) \ |
| 53 | do { \ |
| 54 | /* do nothing but check printf format */ \ |
| 55 | if (0) \ |
| 56 | printf("[debug liblttnctl] " fmt, ## args); \ |
| 57 | } while (0) |
| 58 | #endif |
| 59 | |
| 60 | |
| 61 | /* Socket to session daemon for communication */ |
| 62 | static int sessiond_socket; |
| 63 | static char sessiond_sock_path[PATH_MAX]; |
| 64 | |
| 65 | /* Variables */ |
| 66 | static char *tracing_group; |
| 67 | static int connected; |
| 68 | |
| 69 | /* Global */ |
| 70 | |
| 71 | /* |
| 72 | * Those two variables are used by error.h to silent or control the verbosity of |
| 73 | * error message. They are global to the library so application linking with it |
| 74 | * are able to compile correctly and also control verbosity of the library. |
| 75 | */ |
| 76 | int lttng_opt_quiet; |
| 77 | int lttng_opt_verbose; |
| 78 | int lttng_opt_mi; |
| 79 | |
| 80 | /* |
| 81 | * Copy string from src to dst and enforce null terminated byte. |
| 82 | */ |
| 83 | LTTNG_HIDDEN |
| 84 | void lttng_ctl_copy_string(char *dst, const char *src, size_t len) |
| 85 | { |
| 86 | if (src && dst) { |
| 87 | strncpy(dst, src, len); |
| 88 | /* Enforce the NULL terminated byte */ |
| 89 | dst[len - 1] = '\0'; |
| 90 | } else if (dst) { |
| 91 | dst[0] = '\0'; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Copy domain to lttcomm_session_msg domain. |
| 97 | * |
| 98 | * If domain is unknown, default domain will be the kernel. |
| 99 | */ |
| 100 | LTTNG_HIDDEN |
| 101 | void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst, |
| 102 | struct lttng_domain *src) |
| 103 | { |
| 104 | if (src && dst) { |
| 105 | switch (src->type) { |
| 106 | case LTTNG_DOMAIN_KERNEL: |
| 107 | case LTTNG_DOMAIN_UST: |
| 108 | case LTTNG_DOMAIN_JUL: |
| 109 | case LTTNG_DOMAIN_LOG4J: |
| 110 | case LTTNG_DOMAIN_PYTHON: |
| 111 | memcpy(dst, src, sizeof(struct lttng_domain)); |
| 112 | break; |
| 113 | default: |
| 114 | memset(dst, 0, sizeof(struct lttng_domain)); |
| 115 | break; |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * Send lttcomm_session_msg to the session daemon. |
| 122 | * |
| 123 | * On success, returns the number of bytes sent (>=0) |
| 124 | * On error, returns -1 |
| 125 | */ |
| 126 | static int send_session_msg(struct lttcomm_session_msg *lsm) |
| 127 | { |
| 128 | int ret; |
| 129 | |
| 130 | if (!connected) { |
| 131 | ret = -LTTNG_ERR_NO_SESSIOND; |
| 132 | goto end; |
| 133 | } |
| 134 | |
| 135 | DBG("LSM cmd type : %d", lsm->cmd_type); |
| 136 | |
| 137 | ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm, |
| 138 | sizeof(struct lttcomm_session_msg)); |
| 139 | if (ret < 0) { |
| 140 | ret = -LTTNG_ERR_FATAL; |
| 141 | } |
| 142 | |
| 143 | end: |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Send var len data to the session daemon. |
| 149 | * |
| 150 | * On success, returns the number of bytes sent (>=0) |
| 151 | * On error, returns -1 |
| 152 | */ |
| 153 | static int send_session_varlen(void *data, size_t len) |
| 154 | { |
| 155 | int ret; |
| 156 | |
| 157 | if (!connected) { |
| 158 | ret = -LTTNG_ERR_NO_SESSIOND; |
| 159 | goto end; |
| 160 | } |
| 161 | |
| 162 | if (!data || !len) { |
| 163 | ret = 0; |
| 164 | goto end; |
| 165 | } |
| 166 | |
| 167 | ret = lttcomm_send_unix_sock(sessiond_socket, data, len); |
| 168 | if (ret < 0) { |
| 169 | ret = -LTTNG_ERR_FATAL; |
| 170 | } |
| 171 | |
| 172 | end: |
| 173 | return ret; |
| 174 | } |
| 175 | |
| 176 | /* |
| 177 | * Receive data from the sessiond socket. |
| 178 | * |
| 179 | * On success, returns the number of bytes received (>=0) |
| 180 | * On error, returns -1 (recvmsg() error) or -ENOTCONN |
| 181 | */ |
| 182 | static int recv_data_sessiond(void *buf, size_t len) |
| 183 | { |
| 184 | int ret; |
| 185 | |
| 186 | if (!connected) { |
| 187 | ret = -LTTNG_ERR_NO_SESSIOND; |
| 188 | goto end; |
| 189 | } |
| 190 | |
| 191 | ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len); |
| 192 | if (ret < 0) { |
| 193 | ret = -LTTNG_ERR_FATAL; |
| 194 | } |
| 195 | |
| 196 | end: |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Check if we are in the specified group. |
| 202 | * |
| 203 | * If yes return 1, else return -1. |
| 204 | */ |
| 205 | LTTNG_HIDDEN |
| 206 | int lttng_check_tracing_group(void) |
| 207 | { |
| 208 | struct group *grp_tracing; /* no free(). See getgrnam(3) */ |
| 209 | gid_t *grp_list; |
| 210 | int grp_list_size, grp_id, i; |
| 211 | int ret = -1; |
| 212 | const char *grp_name = tracing_group; |
| 213 | |
| 214 | /* Get GID of group 'tracing' */ |
| 215 | grp_tracing = getgrnam(grp_name); |
| 216 | if (!grp_tracing) { |
| 217 | /* If grp_tracing is NULL, the group does not exist. */ |
| 218 | goto end; |
| 219 | } |
| 220 | |
| 221 | /* Get number of supplementary group IDs */ |
| 222 | grp_list_size = getgroups(0, NULL); |
| 223 | if (grp_list_size < 0) { |
| 224 | PERROR("getgroups"); |
| 225 | goto end; |
| 226 | } |
| 227 | |
| 228 | /* Alloc group list of the right size */ |
| 229 | grp_list = zmalloc(grp_list_size * sizeof(gid_t)); |
| 230 | if (!grp_list) { |
| 231 | PERROR("malloc"); |
| 232 | goto end; |
| 233 | } |
| 234 | grp_id = getgroups(grp_list_size, grp_list); |
| 235 | if (grp_id < 0) { |
| 236 | PERROR("getgroups"); |
| 237 | goto free_list; |
| 238 | } |
| 239 | |
| 240 | for (i = 0; i < grp_list_size; i++) { |
| 241 | if (grp_list[i] == grp_tracing->gr_gid) { |
| 242 | ret = 1; |
| 243 | break; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | free_list: |
| 248 | free(grp_list); |
| 249 | |
| 250 | end: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Try connect to session daemon with sock_path. |
| 256 | * |
| 257 | * Return 0 on success, else -1 |
| 258 | */ |
| 259 | static int try_connect_sessiond(const char *sock_path) |
| 260 | { |
| 261 | int ret; |
| 262 | |
| 263 | /* If socket exist, we check if the daemon listens for connect. */ |
| 264 | ret = access(sock_path, F_OK); |
| 265 | if (ret < 0) { |
| 266 | /* Not alive */ |
| 267 | goto error; |
| 268 | } |
| 269 | |
| 270 | ret = lttcomm_connect_unix_sock(sock_path); |
| 271 | if (ret < 0) { |
| 272 | /* Not alive */ |
| 273 | goto error; |
| 274 | } |
| 275 | |
| 276 | ret = lttcomm_close_unix_sock(ret); |
| 277 | if (ret < 0) { |
| 278 | PERROR("lttcomm_close_unix_sock"); |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | |
| 283 | error: |
| 284 | return -1; |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Set sessiond socket path by putting it in the global sessiond_sock_path |
| 289 | * variable. |
| 290 | * |
| 291 | * Returns 0 on success, negative value on failure (the sessiond socket path |
| 292 | * is somehow too long or ENOMEM). |
| 293 | */ |
| 294 | static int set_session_daemon_path(void) |
| 295 | { |
| 296 | int in_tgroup = 0; /* In tracing group */ |
| 297 | uid_t uid; |
| 298 | |
| 299 | uid = getuid(); |
| 300 | |
| 301 | if (uid != 0) { |
| 302 | /* Are we in the tracing group ? */ |
| 303 | in_tgroup = lttng_check_tracing_group(); |
| 304 | } |
| 305 | |
| 306 | if ((uid == 0) || in_tgroup) { |
| 307 | lttng_ctl_copy_string(sessiond_sock_path, |
| 308 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK, sizeof(sessiond_sock_path)); |
| 309 | } |
| 310 | |
| 311 | if (uid != 0) { |
| 312 | int ret; |
| 313 | |
| 314 | if (in_tgroup) { |
| 315 | /* Tracing group */ |
| 316 | ret = try_connect_sessiond(sessiond_sock_path); |
| 317 | if (ret >= 0) { |
| 318 | goto end; |
| 319 | } |
| 320 | /* Global session daemon not available... */ |
| 321 | } |
| 322 | /* ...or not in tracing group (and not root), default */ |
| 323 | |
| 324 | /* |
| 325 | * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small; |
| 326 | * With GNU C >= 2.1, snprintf returns the required size (excluding closing null) |
| 327 | */ |
| 328 | ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path), |
| 329 | DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir()); |
| 330 | if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) { |
| 331 | goto error; |
| 332 | } |
| 333 | } |
| 334 | end: |
| 335 | return 0; |
| 336 | |
| 337 | error: |
| 338 | return -1; |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Connect to the LTTng session daemon. |
| 343 | * |
| 344 | * On success, return 0. On error, return -1. |
| 345 | */ |
| 346 | static int connect_sessiond(void) |
| 347 | { |
| 348 | int ret; |
| 349 | |
| 350 | /* Don't try to connect if already connected. */ |
| 351 | if (connected) { |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | ret = set_session_daemon_path(); |
| 356 | if (ret < 0) { |
| 357 | goto error; |
| 358 | } |
| 359 | |
| 360 | /* Connect to the sesssion daemon */ |
| 361 | ret = lttcomm_connect_unix_sock(sessiond_sock_path); |
| 362 | if (ret < 0) { |
| 363 | goto error; |
| 364 | } |
| 365 | |
| 366 | sessiond_socket = ret; |
| 367 | connected = 1; |
| 368 | |
| 369 | return 0; |
| 370 | |
| 371 | error: |
| 372 | return -1; |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * Clean disconnect from the session daemon. |
| 377 | * On success, return 0. On error, return -1. |
| 378 | */ |
| 379 | static int disconnect_sessiond(void) |
| 380 | { |
| 381 | int ret = 0; |
| 382 | |
| 383 | if (connected) { |
| 384 | ret = lttcomm_close_unix_sock(sessiond_socket); |
| 385 | sessiond_socket = 0; |
| 386 | connected = 0; |
| 387 | } |
| 388 | |
| 389 | return ret; |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Ask the session daemon a specific command and put the data into buf. |
| 394 | * Takes extra var. len. data as input to send to the session daemon. |
| 395 | * |
| 396 | * Return size of data (only payload, not header) or a negative error code. |
| 397 | */ |
| 398 | LTTNG_HIDDEN |
| 399 | int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm, |
| 400 | void *vardata, size_t varlen, void **buf) |
| 401 | { |
| 402 | int ret; |
| 403 | size_t size; |
| 404 | void *data = NULL; |
| 405 | struct lttcomm_lttng_msg llm; |
| 406 | |
| 407 | ret = connect_sessiond(); |
| 408 | if (ret < 0) { |
| 409 | ret = -LTTNG_ERR_NO_SESSIOND; |
| 410 | goto end; |
| 411 | } |
| 412 | |
| 413 | /* Send command to session daemon */ |
| 414 | ret = send_session_msg(lsm); |
| 415 | if (ret < 0) { |
| 416 | /* Ret value is a valid lttng error code. */ |
| 417 | goto end; |
| 418 | } |
| 419 | /* Send var len data */ |
| 420 | ret = send_session_varlen(vardata, varlen); |
| 421 | if (ret < 0) { |
| 422 | /* Ret value is a valid lttng error code. */ |
| 423 | goto end; |
| 424 | } |
| 425 | |
| 426 | /* Get header from data transmission */ |
| 427 | ret = recv_data_sessiond(&llm, sizeof(llm)); |
| 428 | if (ret < 0) { |
| 429 | /* Ret value is a valid lttng error code. */ |
| 430 | goto end; |
| 431 | } |
| 432 | |
| 433 | /* Check error code if OK */ |
| 434 | if (llm.ret_code != LTTNG_OK) { |
| 435 | ret = -llm.ret_code; |
| 436 | goto end; |
| 437 | } |
| 438 | |
| 439 | size = llm.data_size; |
| 440 | if (size == 0) { |
| 441 | /* If client free with size 0 */ |
| 442 | if (buf != NULL) { |
| 443 | *buf = NULL; |
| 444 | } |
| 445 | ret = 0; |
| 446 | goto end; |
| 447 | } |
| 448 | |
| 449 | data = zmalloc(size); |
| 450 | if (!data) { |
| 451 | ret = -ENOMEM; |
| 452 | goto end; |
| 453 | } |
| 454 | |
| 455 | /* Get payload data */ |
| 456 | ret = recv_data_sessiond(data, size); |
| 457 | if (ret < 0) { |
| 458 | free(data); |
| 459 | goto end; |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Extra protection not to dereference a NULL pointer. If buf is NULL at |
| 464 | * this point, an error is returned and data is freed. |
| 465 | */ |
| 466 | if (buf == NULL) { |
| 467 | ret = -LTTNG_ERR_INVALID; |
| 468 | free(data); |
| 469 | goto end; |
| 470 | } |
| 471 | |
| 472 | *buf = data; |
| 473 | ret = size; |
| 474 | |
| 475 | end: |
| 476 | disconnect_sessiond(); |
| 477 | return ret; |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Create lttng handle and return pointer. |
| 482 | * The returned pointer will be NULL in case of malloc() error. |
| 483 | */ |
| 484 | struct lttng_handle *lttng_create_handle(const char *session_name, |
| 485 | struct lttng_domain *domain) |
| 486 | { |
| 487 | struct lttng_handle *handle = NULL; |
| 488 | |
| 489 | if (domain == NULL) { |
| 490 | goto end; |
| 491 | } |
| 492 | |
| 493 | handle = zmalloc(sizeof(struct lttng_handle)); |
| 494 | if (handle == NULL) { |
| 495 | PERROR("malloc handle"); |
| 496 | goto end; |
| 497 | } |
| 498 | |
| 499 | /* Copy session name */ |
| 500 | lttng_ctl_copy_string(handle->session_name, session_name, |
| 501 | sizeof(handle->session_name)); |
| 502 | |
| 503 | /* Copy lttng domain */ |
| 504 | lttng_ctl_copy_lttng_domain(&handle->domain, domain); |
| 505 | |
| 506 | end: |
| 507 | return handle; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Destroy handle by free(3) the pointer. |
| 512 | */ |
| 513 | void lttng_destroy_handle(struct lttng_handle *handle) |
| 514 | { |
| 515 | free(handle); |
| 516 | } |
| 517 | |
| 518 | /* |
| 519 | * Register an outside consumer. |
| 520 | * Returns size of returned session payload data or a negative error code. |
| 521 | */ |
| 522 | int lttng_register_consumer(struct lttng_handle *handle, |
| 523 | const char *socket_path) |
| 524 | { |
| 525 | struct lttcomm_session_msg lsm; |
| 526 | |
| 527 | if (handle == NULL || socket_path == NULL) { |
| 528 | return -LTTNG_ERR_INVALID; |
| 529 | } |
| 530 | |
| 531 | memset(&lsm, 0, sizeof(lsm)); |
| 532 | lsm.cmd_type = LTTNG_REGISTER_CONSUMER; |
| 533 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 534 | sizeof(lsm.session.name)); |
| 535 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 536 | |
| 537 | lttng_ctl_copy_string(lsm.u.reg.path, socket_path, sizeof(lsm.u.reg.path)); |
| 538 | |
| 539 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * Start tracing for all traces of the session. |
| 544 | * Returns size of returned session payload data or a negative error code. |
| 545 | */ |
| 546 | int lttng_start_tracing(const char *session_name) |
| 547 | { |
| 548 | struct lttcomm_session_msg lsm; |
| 549 | |
| 550 | if (session_name == NULL) { |
| 551 | return -LTTNG_ERR_INVALID; |
| 552 | } |
| 553 | |
| 554 | memset(&lsm, 0, sizeof(lsm)); |
| 555 | lsm.cmd_type = LTTNG_START_TRACE; |
| 556 | |
| 557 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 558 | sizeof(lsm.session.name)); |
| 559 | |
| 560 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * Stop tracing for all traces of the session. |
| 565 | */ |
| 566 | static int _lttng_stop_tracing(const char *session_name, int wait) |
| 567 | { |
| 568 | int ret, data_ret; |
| 569 | struct lttcomm_session_msg lsm; |
| 570 | |
| 571 | if (session_name == NULL) { |
| 572 | return -LTTNG_ERR_INVALID; |
| 573 | } |
| 574 | |
| 575 | memset(&lsm, 0, sizeof(lsm)); |
| 576 | lsm.cmd_type = LTTNG_STOP_TRACE; |
| 577 | |
| 578 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 579 | sizeof(lsm.session.name)); |
| 580 | |
| 581 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
| 582 | if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) { |
| 583 | goto error; |
| 584 | } |
| 585 | |
| 586 | if (!wait) { |
| 587 | goto end; |
| 588 | } |
| 589 | |
| 590 | /* Check for data availability */ |
| 591 | do { |
| 592 | data_ret = lttng_data_pending(session_name); |
| 593 | if (data_ret < 0) { |
| 594 | /* Return the data available call error. */ |
| 595 | ret = data_ret; |
| 596 | goto error; |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Data sleep time before retrying (in usec). Don't sleep if the call |
| 601 | * returned value indicates availability. |
| 602 | */ |
| 603 | if (data_ret) { |
| 604 | usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME); |
| 605 | } |
| 606 | } while (data_ret != 0); |
| 607 | |
| 608 | end: |
| 609 | error: |
| 610 | return ret; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Stop tracing and wait for data availability. |
| 615 | */ |
| 616 | int lttng_stop_tracing(const char *session_name) |
| 617 | { |
| 618 | return _lttng_stop_tracing(session_name, 1); |
| 619 | } |
| 620 | |
| 621 | /* |
| 622 | * Stop tracing but _don't_ wait for data availability. |
| 623 | */ |
| 624 | int lttng_stop_tracing_no_wait(const char *session_name) |
| 625 | { |
| 626 | return _lttng_stop_tracing(session_name, 0); |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Add context to a channel. |
| 631 | * |
| 632 | * If the given channel is NULL, add the contexts to all channels. |
| 633 | * The event_name param is ignored. |
| 634 | * |
| 635 | * Returns the size of the returned payload data or a negative error code. |
| 636 | */ |
| 637 | int lttng_add_context(struct lttng_handle *handle, |
| 638 | struct lttng_event_context *ctx, const char *event_name, |
| 639 | const char *channel_name) |
| 640 | { |
| 641 | struct lttcomm_session_msg lsm; |
| 642 | |
| 643 | /* Safety check. Both are mandatory */ |
| 644 | if (handle == NULL || ctx == NULL) { |
| 645 | return -LTTNG_ERR_INVALID; |
| 646 | } |
| 647 | |
| 648 | memset(&lsm, 0, sizeof(lsm)); |
| 649 | |
| 650 | lsm.cmd_type = LTTNG_ADD_CONTEXT; |
| 651 | |
| 652 | /* If no channel name, send empty string. */ |
| 653 | if (channel_name == NULL) { |
| 654 | lttng_ctl_copy_string(lsm.u.context.channel_name, "", |
| 655 | sizeof(lsm.u.context.channel_name)); |
| 656 | } else { |
| 657 | lttng_ctl_copy_string(lsm.u.context.channel_name, channel_name, |
| 658 | sizeof(lsm.u.context.channel_name)); |
| 659 | } |
| 660 | |
| 661 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 662 | |
| 663 | memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context)); |
| 664 | |
| 665 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 666 | sizeof(lsm.session.name)); |
| 667 | |
| 668 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * Enable event(s) for a channel. |
| 673 | * If no event name is specified, all events are enabled. |
| 674 | * If no channel name is specified, the default 'channel0' is used. |
| 675 | * Returns size of returned session payload data or a negative error code. |
| 676 | */ |
| 677 | int lttng_enable_event(struct lttng_handle *handle, |
| 678 | struct lttng_event *ev, const char *channel_name) |
| 679 | { |
| 680 | return lttng_enable_event_with_exclusions(handle, ev, channel_name, |
| 681 | NULL, 0, NULL); |
| 682 | } |
| 683 | |
| 684 | /* |
| 685 | * Create or enable an event with a filter expression. |
| 686 | * |
| 687 | * Return negative error value on error. |
| 688 | * Return size of returned session payload data if OK. |
| 689 | */ |
| 690 | int lttng_enable_event_with_filter(struct lttng_handle *handle, |
| 691 | struct lttng_event *event, const char *channel_name, |
| 692 | const char *filter_expression) |
| 693 | { |
| 694 | return lttng_enable_event_with_exclusions(handle, event, channel_name, |
| 695 | filter_expression, 0, NULL); |
| 696 | } |
| 697 | |
| 698 | /* |
| 699 | * Depending on the event, return a newly allocated agent filter expression or |
| 700 | * NULL if not applicable. |
| 701 | * |
| 702 | * An event with NO loglevel and the name is * will return NULL. |
| 703 | */ |
| 704 | static char *set_agent_filter(const char *filter, struct lttng_event *ev) |
| 705 | { |
| 706 | int err; |
| 707 | char *agent_filter = NULL; |
| 708 | |
| 709 | assert(ev); |
| 710 | |
| 711 | /* Don't add filter for the '*' event. */ |
| 712 | if (ev->name[0] != '*') { |
| 713 | if (filter) { |
| 714 | err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter, |
| 715 | ev->name); |
| 716 | } else { |
| 717 | err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name); |
| 718 | } |
| 719 | if (err < 0) { |
| 720 | PERROR("asprintf"); |
| 721 | goto error; |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | /* Add loglevel filtering if any for the JUL domain. */ |
| 726 | if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { |
| 727 | char *op; |
| 728 | |
| 729 | if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { |
| 730 | op = ">="; |
| 731 | } else { |
| 732 | op = "=="; |
| 733 | } |
| 734 | |
| 735 | if (filter || agent_filter) { |
| 736 | char *new_filter; |
| 737 | |
| 738 | err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)", |
| 739 | agent_filter ? agent_filter : filter, op, |
| 740 | ev->loglevel); |
| 741 | if (agent_filter) { |
| 742 | free(agent_filter); |
| 743 | } |
| 744 | agent_filter = new_filter; |
| 745 | } else { |
| 746 | err = asprintf(&agent_filter, "int_loglevel %s %d", op, |
| 747 | ev->loglevel); |
| 748 | } |
| 749 | if (err < 0) { |
| 750 | PERROR("asprintf"); |
| 751 | goto error; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | return agent_filter; |
| 756 | error: |
| 757 | free(agent_filter); |
| 758 | return NULL; |
| 759 | } |
| 760 | |
| 761 | /* |
| 762 | * Generate the filter bytecode from a give filter expression string. Put the |
| 763 | * newly allocated parser context in ctxp and populate the lsm object with the |
| 764 | * expression len. |
| 765 | * |
| 766 | * Return 0 on success else a LTTNG_ERR_* code and ctxp is untouched. |
| 767 | */ |
| 768 | static int generate_filter(char *filter_expression, |
| 769 | struct lttcomm_session_msg *lsm, struct filter_parser_ctx **ctxp) |
| 770 | { |
| 771 | int ret; |
| 772 | struct filter_parser_ctx *ctx = NULL; |
| 773 | FILE *fmem = NULL; |
| 774 | |
| 775 | assert(filter_expression); |
| 776 | assert(lsm); |
| 777 | assert(ctxp); |
| 778 | |
| 779 | /* |
| 780 | * Casting const to non-const, as the underlying function will use it in |
| 781 | * read-only mode. |
| 782 | */ |
| 783 | fmem = lttng_fmemopen((void *) filter_expression, |
| 784 | strlen(filter_expression), "r"); |
| 785 | if (!fmem) { |
| 786 | fprintf(stderr, "Error opening memory as stream\n"); |
| 787 | ret = -LTTNG_ERR_FILTER_NOMEM; |
| 788 | goto error; |
| 789 | } |
| 790 | ctx = filter_parser_ctx_alloc(fmem); |
| 791 | if (!ctx) { |
| 792 | fprintf(stderr, "Error allocating parser\n"); |
| 793 | ret = -LTTNG_ERR_FILTER_NOMEM; |
| 794 | goto filter_alloc_error; |
| 795 | } |
| 796 | ret = filter_parser_ctx_append_ast(ctx); |
| 797 | if (ret) { |
| 798 | fprintf(stderr, "Parse error\n"); |
| 799 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 800 | goto parse_error; |
| 801 | } |
| 802 | ret = filter_visitor_set_parent(ctx); |
| 803 | if (ret) { |
| 804 | fprintf(stderr, "Set parent error\n"); |
| 805 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 806 | goto parse_error; |
| 807 | } |
| 808 | if (print_xml) { |
| 809 | ret = filter_visitor_print_xml(ctx, stdout, 0); |
| 810 | if (ret) { |
| 811 | fflush(stdout); |
| 812 | fprintf(stderr, "XML print error\n"); |
| 813 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 814 | goto parse_error; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | dbg_printf("Generating IR... "); |
| 819 | fflush(stdout); |
| 820 | ret = filter_visitor_ir_generate(ctx); |
| 821 | if (ret) { |
| 822 | fprintf(stderr, "Generate IR error\n"); |
| 823 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 824 | goto parse_error; |
| 825 | } |
| 826 | dbg_printf("done\n"); |
| 827 | |
| 828 | dbg_printf("Validating IR... "); |
| 829 | fflush(stdout); |
| 830 | ret = filter_visitor_ir_check_binary_op_nesting(ctx); |
| 831 | if (ret) { |
| 832 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 833 | goto parse_error; |
| 834 | } |
| 835 | /* Validate strings used as literals in the expression */ |
| 836 | ret = filter_visitor_ir_validate_string(ctx); |
| 837 | if (ret) { |
| 838 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 839 | goto parse_error; |
| 840 | } |
| 841 | dbg_printf("done\n"); |
| 842 | |
| 843 | dbg_printf("Generating bytecode... "); |
| 844 | fflush(stdout); |
| 845 | ret = filter_visitor_bytecode_generate(ctx); |
| 846 | if (ret) { |
| 847 | fprintf(stderr, "Generate bytecode error\n"); |
| 848 | ret = -LTTNG_ERR_FILTER_INVAL; |
| 849 | goto parse_error; |
| 850 | } |
| 851 | dbg_printf("done\n"); |
| 852 | dbg_printf("Size of bytecode generated: %u bytes.\n", |
| 853 | bytecode_get_len(&ctx->bytecode->b)); |
| 854 | |
| 855 | lsm->u.enable.bytecode_len = sizeof(ctx->bytecode->b) |
| 856 | + bytecode_get_len(&ctx->bytecode->b); |
| 857 | lsm->u.enable.expression_len = strlen(filter_expression) + 1; |
| 858 | |
| 859 | /* No need to keep the memory stream. */ |
| 860 | if (fclose(fmem) != 0) { |
| 861 | PERROR("fclose"); |
| 862 | } |
| 863 | |
| 864 | *ctxp = ctx; |
| 865 | return 0; |
| 866 | |
| 867 | parse_error: |
| 868 | filter_ir_free(ctx); |
| 869 | filter_parser_ctx_free(ctx); |
| 870 | filter_alloc_error: |
| 871 | if (fclose(fmem) != 0) { |
| 872 | PERROR("fclose"); |
| 873 | } |
| 874 | error: |
| 875 | return ret; |
| 876 | } |
| 877 | |
| 878 | /* |
| 879 | * Enable event(s) for a channel, possibly with exclusions and a filter. |
| 880 | * If no event name is specified, all events are enabled. |
| 881 | * If no channel name is specified, the default name is used. |
| 882 | * If filter expression is not NULL, the filter is set for the event. |
| 883 | * If exclusion count is not zero, the exclusions are set for the event. |
| 884 | * Returns size of returned session payload data or a negative error code. |
| 885 | */ |
| 886 | int lttng_enable_event_with_exclusions(struct lttng_handle *handle, |
| 887 | struct lttng_event *ev, const char *channel_name, |
| 888 | const char *original_filter_expression, |
| 889 | int exclusion_count, char **exclusion_list) |
| 890 | { |
| 891 | struct lttcomm_session_msg lsm; |
| 892 | char *varlen_data; |
| 893 | int ret = 0; |
| 894 | unsigned int free_filter_expression = 0; |
| 895 | struct filter_parser_ctx *ctx = NULL; |
| 896 | /* |
| 897 | * Cast as non-const since we may replace the filter expression |
| 898 | * by a dynamically allocated string. Otherwise, the original |
| 899 | * string is not modified. |
| 900 | */ |
| 901 | char *filter_expression = (char *) original_filter_expression; |
| 902 | |
| 903 | if (handle == NULL || ev == NULL) { |
| 904 | ret = -LTTNG_ERR_INVALID; |
| 905 | goto error; |
| 906 | } |
| 907 | |
| 908 | /* Empty filter string will always be rejected by the parser |
| 909 | * anyway, so treat this corner-case early to eliminate |
| 910 | * lttng_fmemopen error for 0-byte allocation. |
| 911 | */ |
| 912 | if (filter_expression && filter_expression[0] == '\0') { |
| 913 | ret = -LTTNG_ERR_INVALID; |
| 914 | goto error; |
| 915 | } |
| 916 | |
| 917 | memset(&lsm, 0, sizeof(lsm)); |
| 918 | |
| 919 | /* If no channel name, send empty string. */ |
| 920 | if (channel_name == NULL) { |
| 921 | lttng_ctl_copy_string(lsm.u.enable.channel_name, "", |
| 922 | sizeof(lsm.u.enable.channel_name)); |
| 923 | } else { |
| 924 | lttng_ctl_copy_string(lsm.u.enable.channel_name, channel_name, |
| 925 | sizeof(lsm.u.enable.channel_name)); |
| 926 | } |
| 927 | |
| 928 | lsm.cmd_type = LTTNG_ENABLE_EVENT; |
| 929 | if (ev->name[0] == '\0') { |
| 930 | /* Enable all events */ |
| 931 | lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); |
| 932 | } |
| 933 | |
| 934 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 935 | /* FIXME: copying non-packed struct to packed struct. */ |
| 936 | memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event)); |
| 937 | |
| 938 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 939 | sizeof(lsm.session.name)); |
| 940 | lsm.u.enable.exclusion_count = exclusion_count; |
| 941 | lsm.u.enable.bytecode_len = 0; |
| 942 | |
| 943 | /* |
| 944 | * For the JUL domain, a filter is enforced except for the enable all |
| 945 | * event. This is done to avoid having the event in all sessions thus |
| 946 | * filtering by logger name. |
| 947 | */ |
| 948 | if (exclusion_count == 0 && filter_expression == NULL && |
| 949 | (handle->domain.type != LTTNG_DOMAIN_JUL && |
| 950 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
| 951 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { |
| 952 | goto ask_sessiond; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * We have either a filter or some exclusions, so we need to set up |
| 957 | * a variable-length memory block from where to send the data |
| 958 | */ |
| 959 | |
| 960 | /* Parse filter expression */ |
| 961 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL |
| 962 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
| 963 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { |
| 964 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
| 965 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
| 966 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { |
| 967 | char *agent_filter; |
| 968 | |
| 969 | /* Setup JUL filter if needed. */ |
| 970 | agent_filter = set_agent_filter(filter_expression, ev); |
| 971 | if (!agent_filter) { |
| 972 | if (!filter_expression) { |
| 973 | /* No JUL and no filter, just skip everything below. */ |
| 974 | goto ask_sessiond; |
| 975 | } |
| 976 | } else { |
| 977 | /* |
| 978 | * With an agent filter, the original filter has been added to |
| 979 | * it thus replace the filter expression. |
| 980 | */ |
| 981 | filter_expression = agent_filter; |
| 982 | free_filter_expression = 1; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | ret = generate_filter(filter_expression, &lsm, &ctx); |
| 987 | if (ret) { |
| 988 | goto filter_error; |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | varlen_data = zmalloc(lsm.u.enable.bytecode_len |
| 993 | + lsm.u.enable.expression_len |
| 994 | + LTTNG_SYMBOL_NAME_LEN * exclusion_count); |
| 995 | if (!varlen_data) { |
| 996 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; |
| 997 | goto mem_error; |
| 998 | } |
| 999 | |
| 1000 | /* Put exclusion names first in the data */ |
| 1001 | while (exclusion_count--) { |
| 1002 | strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count, |
| 1003 | *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN); |
| 1004 | } |
| 1005 | /* Add filter expression next */ |
| 1006 | if (lsm.u.enable.expression_len != 0) { |
| 1007 | memcpy(varlen_data |
| 1008 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count, |
| 1009 | filter_expression, |
| 1010 | lsm.u.enable.expression_len); |
| 1011 | } |
| 1012 | /* Add filter bytecode next */ |
| 1013 | if (ctx && lsm.u.enable.bytecode_len != 0) { |
| 1014 | memcpy(varlen_data |
| 1015 | + LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count |
| 1016 | + lsm.u.enable.expression_len, |
| 1017 | &ctx->bytecode->b, |
| 1018 | lsm.u.enable.bytecode_len); |
| 1019 | } |
| 1020 | |
| 1021 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, |
| 1022 | (LTTNG_SYMBOL_NAME_LEN * lsm.u.enable.exclusion_count) + |
| 1023 | lsm.u.enable.bytecode_len + lsm.u.enable.expression_len, NULL); |
| 1024 | free(varlen_data); |
| 1025 | |
| 1026 | mem_error: |
| 1027 | if (filter_expression && ctx) { |
| 1028 | filter_bytecode_free(ctx); |
| 1029 | filter_ir_free(ctx); |
| 1030 | filter_parser_ctx_free(ctx); |
| 1031 | } |
| 1032 | filter_error: |
| 1033 | if (free_filter_expression) { |
| 1034 | /* |
| 1035 | * The filter expression has been replaced and must be freed as it is |
| 1036 | * not the original filter expression received as a parameter. |
| 1037 | */ |
| 1038 | free(filter_expression); |
| 1039 | } |
| 1040 | error: |
| 1041 | /* |
| 1042 | * Return directly to the caller and don't ask the sessiond since something |
| 1043 | * went wrong in the parsing of data above. |
| 1044 | */ |
| 1045 | return ret; |
| 1046 | |
| 1047 | ask_sessiond: |
| 1048 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1049 | return ret; |
| 1050 | } |
| 1051 | |
| 1052 | int lttng_disable_event_ext(struct lttng_handle *handle, |
| 1053 | struct lttng_event *ev, const char *channel_name, |
| 1054 | const char *original_filter_expression) |
| 1055 | { |
| 1056 | struct lttcomm_session_msg lsm; |
| 1057 | char *varlen_data; |
| 1058 | int ret = 0; |
| 1059 | unsigned int free_filter_expression = 0; |
| 1060 | struct filter_parser_ctx *ctx = NULL; |
| 1061 | /* |
| 1062 | * Cast as non-const since we may replace the filter expression |
| 1063 | * by a dynamically allocated string. Otherwise, the original |
| 1064 | * string is not modified. |
| 1065 | */ |
| 1066 | char *filter_expression = (char *) original_filter_expression; |
| 1067 | |
| 1068 | if (handle == NULL || ev == NULL) { |
| 1069 | ret = -LTTNG_ERR_INVALID; |
| 1070 | goto error; |
| 1071 | } |
| 1072 | |
| 1073 | /* Empty filter string will always be rejected by the parser |
| 1074 | * anyway, so treat this corner-case early to eliminate |
| 1075 | * lttng_fmemopen error for 0-byte allocation. |
| 1076 | */ |
| 1077 | if (filter_expression && filter_expression[0] == '\0') { |
| 1078 | ret = -LTTNG_ERR_INVALID; |
| 1079 | goto error; |
| 1080 | } |
| 1081 | |
| 1082 | memset(&lsm, 0, sizeof(lsm)); |
| 1083 | |
| 1084 | /* If no channel name, send empty string. */ |
| 1085 | if (channel_name == NULL) { |
| 1086 | lttng_ctl_copy_string(lsm.u.disable.channel_name, "", |
| 1087 | sizeof(lsm.u.disable.channel_name)); |
| 1088 | } else { |
| 1089 | lttng_ctl_copy_string(lsm.u.disable.channel_name, channel_name, |
| 1090 | sizeof(lsm.u.disable.channel_name)); |
| 1091 | } |
| 1092 | |
| 1093 | lsm.cmd_type = LTTNG_DISABLE_EVENT; |
| 1094 | if (ev->name[0] == '\0') { |
| 1095 | /* Disable all events */ |
| 1096 | lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name)); |
| 1097 | } |
| 1098 | |
| 1099 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1100 | /* FIXME: copying non-packed struct to packed struct. */ |
| 1101 | memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event)); |
| 1102 | |
| 1103 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1104 | sizeof(lsm.session.name)); |
| 1105 | lsm.u.disable.bytecode_len = 0; |
| 1106 | |
| 1107 | /* |
| 1108 | * For the JUL domain, a filter is enforced except for the |
| 1109 | * disable all event. This is done to avoid having the event in |
| 1110 | * all sessions thus filtering by logger name. |
| 1111 | */ |
| 1112 | if (filter_expression == NULL && |
| 1113 | (handle->domain.type != LTTNG_DOMAIN_JUL && |
| 1114 | handle->domain.type != LTTNG_DOMAIN_LOG4J && |
| 1115 | handle->domain.type != LTTNG_DOMAIN_PYTHON)) { |
| 1116 | goto ask_sessiond; |
| 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * We have a filter, so we need to set up a variable-length |
| 1121 | * memory block from where to send the data. |
| 1122 | */ |
| 1123 | |
| 1124 | /* Parse filter expression */ |
| 1125 | if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL |
| 1126 | || handle->domain.type == LTTNG_DOMAIN_LOG4J |
| 1127 | || handle->domain.type == LTTNG_DOMAIN_PYTHON) { |
| 1128 | if (handle->domain.type == LTTNG_DOMAIN_JUL || |
| 1129 | handle->domain.type == LTTNG_DOMAIN_LOG4J || |
| 1130 | handle->domain.type == LTTNG_DOMAIN_PYTHON) { |
| 1131 | char *agent_filter; |
| 1132 | |
| 1133 | /* Setup JUL filter if needed. */ |
| 1134 | agent_filter = set_agent_filter(filter_expression, ev); |
| 1135 | if (!agent_filter) { |
| 1136 | if (!filter_expression) { |
| 1137 | /* No JUL and no filter, just skip everything below. */ |
| 1138 | goto ask_sessiond; |
| 1139 | } |
| 1140 | } else { |
| 1141 | /* |
| 1142 | * With a JUL filter, the original filter has been added to it |
| 1143 | * thus replace the filter expression. |
| 1144 | */ |
| 1145 | filter_expression = agent_filter; |
| 1146 | free_filter_expression = 1; |
| 1147 | } |
| 1148 | } |
| 1149 | |
| 1150 | ret = generate_filter(filter_expression, &lsm, &ctx); |
| 1151 | if (ret) { |
| 1152 | goto filter_error; |
| 1153 | } |
| 1154 | } |
| 1155 | |
| 1156 | varlen_data = zmalloc(lsm.u.disable.bytecode_len |
| 1157 | + lsm.u.disable.expression_len); |
| 1158 | if (!varlen_data) { |
| 1159 | ret = -LTTNG_ERR_EXCLUSION_NOMEM; |
| 1160 | goto mem_error; |
| 1161 | } |
| 1162 | |
| 1163 | /* Add filter expression */ |
| 1164 | if (lsm.u.disable.expression_len != 0) { |
| 1165 | memcpy(varlen_data, |
| 1166 | filter_expression, |
| 1167 | lsm.u.disable.expression_len); |
| 1168 | } |
| 1169 | /* Add filter bytecode next */ |
| 1170 | if (ctx && lsm.u.disable.bytecode_len != 0) { |
| 1171 | memcpy(varlen_data |
| 1172 | + lsm.u.disable.expression_len, |
| 1173 | &ctx->bytecode->b, |
| 1174 | lsm.u.disable.bytecode_len); |
| 1175 | } |
| 1176 | |
| 1177 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, varlen_data, |
| 1178 | lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL); |
| 1179 | free(varlen_data); |
| 1180 | |
| 1181 | mem_error: |
| 1182 | if (filter_expression && ctx) { |
| 1183 | filter_bytecode_free(ctx); |
| 1184 | filter_ir_free(ctx); |
| 1185 | filter_parser_ctx_free(ctx); |
| 1186 | } |
| 1187 | filter_error: |
| 1188 | if (free_filter_expression) { |
| 1189 | /* |
| 1190 | * The filter expression has been replaced and must be freed as it is |
| 1191 | * not the original filter expression received as a parameter. |
| 1192 | */ |
| 1193 | free(filter_expression); |
| 1194 | } |
| 1195 | error: |
| 1196 | /* |
| 1197 | * Return directly to the caller and don't ask the sessiond since something |
| 1198 | * went wrong in the parsing of data above. |
| 1199 | */ |
| 1200 | return ret; |
| 1201 | |
| 1202 | ask_sessiond: |
| 1203 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1204 | return ret; |
| 1205 | } |
| 1206 | |
| 1207 | /* |
| 1208 | * Disable event(s) of a channel and domain. |
| 1209 | * If no event name is specified, all events are disabled. |
| 1210 | * If no channel name is specified, the default 'channel0' is used. |
| 1211 | * Returns size of returned session payload data or a negative error code. |
| 1212 | */ |
| 1213 | int lttng_disable_event(struct lttng_handle *handle, const char *name, |
| 1214 | const char *channel_name) |
| 1215 | { |
| 1216 | struct lttng_event ev; |
| 1217 | |
| 1218 | memset(&ev, 0, sizeof(ev)); |
| 1219 | ev.loglevel = -1; |
| 1220 | ev.type = LTTNG_EVENT_ALL; |
| 1221 | lttng_ctl_copy_string(ev.name, name, sizeof(ev.name)); |
| 1222 | return lttng_disable_event_ext(handle, &ev, channel_name, NULL); |
| 1223 | } |
| 1224 | |
| 1225 | /* |
| 1226 | * Enable channel per domain |
| 1227 | * Returns size of returned session payload data or a negative error code. |
| 1228 | */ |
| 1229 | int lttng_enable_channel(struct lttng_handle *handle, |
| 1230 | struct lttng_channel *chan) |
| 1231 | { |
| 1232 | struct lttcomm_session_msg lsm; |
| 1233 | |
| 1234 | /* |
| 1235 | * NULL arguments are forbidden. No default values. |
| 1236 | */ |
| 1237 | if (handle == NULL || chan == NULL) { |
| 1238 | return -LTTNG_ERR_INVALID; |
| 1239 | } |
| 1240 | |
| 1241 | memset(&lsm, 0, sizeof(lsm)); |
| 1242 | |
| 1243 | memcpy(&lsm.u.channel.chan, chan, sizeof(lsm.u.channel.chan)); |
| 1244 | |
| 1245 | lsm.cmd_type = LTTNG_ENABLE_CHANNEL; |
| 1246 | |
| 1247 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1248 | |
| 1249 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1250 | sizeof(lsm.session.name)); |
| 1251 | |
| 1252 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1253 | } |
| 1254 | |
| 1255 | /* |
| 1256 | * All tracing will be stopped for registered events of the channel. |
| 1257 | * Returns size of returned session payload data or a negative error code. |
| 1258 | */ |
| 1259 | int lttng_disable_channel(struct lttng_handle *handle, const char *name) |
| 1260 | { |
| 1261 | struct lttcomm_session_msg lsm; |
| 1262 | |
| 1263 | /* Safety check. Both are mandatory */ |
| 1264 | if (handle == NULL || name == NULL) { |
| 1265 | return -LTTNG_ERR_INVALID; |
| 1266 | } |
| 1267 | |
| 1268 | memset(&lsm, 0, sizeof(lsm)); |
| 1269 | |
| 1270 | lsm.cmd_type = LTTNG_DISABLE_CHANNEL; |
| 1271 | |
| 1272 | lttng_ctl_copy_string(lsm.u.disable.channel_name, name, |
| 1273 | sizeof(lsm.u.disable.channel_name)); |
| 1274 | |
| 1275 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1276 | |
| 1277 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1278 | sizeof(lsm.session.name)); |
| 1279 | |
| 1280 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1281 | } |
| 1282 | |
| 1283 | /* |
| 1284 | * Add PID to session tracker. |
| 1285 | * Return 0 on success else a negative LTTng error code. |
| 1286 | */ |
| 1287 | int lttng_track_pid(struct lttng_handle *handle, int pid) |
| 1288 | { |
| 1289 | struct lttcomm_session_msg lsm; |
| 1290 | |
| 1291 | /* |
| 1292 | * NULL arguments are forbidden. No default values. |
| 1293 | */ |
| 1294 | if (handle == NULL) { |
| 1295 | return -LTTNG_ERR_INVALID; |
| 1296 | } |
| 1297 | |
| 1298 | memset(&lsm, 0, sizeof(lsm)); |
| 1299 | |
| 1300 | lsm.cmd_type = LTTNG_TRACK_PID; |
| 1301 | lsm.u.pid_tracker.pid = pid; |
| 1302 | |
| 1303 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1304 | |
| 1305 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1306 | sizeof(lsm.session.name)); |
| 1307 | |
| 1308 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1309 | } |
| 1310 | |
| 1311 | /* |
| 1312 | * Remove PID from session tracker. |
| 1313 | * Return 0 on success else a negative LTTng error code. |
| 1314 | */ |
| 1315 | int lttng_untrack_pid(struct lttng_handle *handle, int pid) |
| 1316 | { |
| 1317 | struct lttcomm_session_msg lsm; |
| 1318 | |
| 1319 | /* |
| 1320 | * NULL arguments are forbidden. No default values. |
| 1321 | */ |
| 1322 | if (handle == NULL) { |
| 1323 | return -LTTNG_ERR_INVALID; |
| 1324 | } |
| 1325 | |
| 1326 | memset(&lsm, 0, sizeof(lsm)); |
| 1327 | |
| 1328 | lsm.cmd_type = LTTNG_UNTRACK_PID; |
| 1329 | lsm.u.pid_tracker.pid = pid; |
| 1330 | |
| 1331 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1332 | |
| 1333 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1334 | sizeof(lsm.session.name)); |
| 1335 | |
| 1336 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1337 | } |
| 1338 | |
| 1339 | /* |
| 1340 | * Lists all available tracepoints of domain. |
| 1341 | * Sets the contents of the events array. |
| 1342 | * Returns the number of lttng_event entries in events; |
| 1343 | * on error, returns a negative value. |
| 1344 | */ |
| 1345 | int lttng_list_tracepoints(struct lttng_handle *handle, |
| 1346 | struct lttng_event **events) |
| 1347 | { |
| 1348 | int ret; |
| 1349 | struct lttcomm_session_msg lsm; |
| 1350 | |
| 1351 | if (handle == NULL) { |
| 1352 | return -LTTNG_ERR_INVALID; |
| 1353 | } |
| 1354 | |
| 1355 | memset(&lsm, 0, sizeof(lsm)); |
| 1356 | lsm.cmd_type = LTTNG_LIST_TRACEPOINTS; |
| 1357 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1358 | |
| 1359 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
| 1360 | if (ret < 0) { |
| 1361 | return ret; |
| 1362 | } |
| 1363 | |
| 1364 | return ret / sizeof(struct lttng_event); |
| 1365 | } |
| 1366 | |
| 1367 | /* |
| 1368 | * Lists all available tracepoint fields of domain. |
| 1369 | * Sets the contents of the event field array. |
| 1370 | * Returns the number of lttng_event_field entries in events; |
| 1371 | * on error, returns a negative value. |
| 1372 | */ |
| 1373 | int lttng_list_tracepoint_fields(struct lttng_handle *handle, |
| 1374 | struct lttng_event_field **fields) |
| 1375 | { |
| 1376 | int ret; |
| 1377 | struct lttcomm_session_msg lsm; |
| 1378 | |
| 1379 | if (handle == NULL) { |
| 1380 | return -LTTNG_ERR_INVALID; |
| 1381 | } |
| 1382 | |
| 1383 | memset(&lsm, 0, sizeof(lsm)); |
| 1384 | lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS; |
| 1385 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1386 | |
| 1387 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields); |
| 1388 | if (ret < 0) { |
| 1389 | return ret; |
| 1390 | } |
| 1391 | |
| 1392 | return ret / sizeof(struct lttng_event_field); |
| 1393 | } |
| 1394 | |
| 1395 | /* |
| 1396 | * Lists all available kernel system calls. Allocates and sets the contents of |
| 1397 | * the events array. |
| 1398 | * |
| 1399 | * Returns the number of lttng_event entries in events; on error, returns a |
| 1400 | * negative value. |
| 1401 | */ |
| 1402 | int lttng_list_syscalls(struct lttng_event **events) |
| 1403 | { |
| 1404 | int ret; |
| 1405 | struct lttcomm_session_msg lsm; |
| 1406 | |
| 1407 | if (!events) { |
| 1408 | return -LTTNG_ERR_INVALID; |
| 1409 | } |
| 1410 | |
| 1411 | memset(&lsm, 0, sizeof(lsm)); |
| 1412 | lsm.cmd_type = LTTNG_LIST_SYSCALLS; |
| 1413 | /* Force kernel domain for system calls. */ |
| 1414 | lsm.domain.type = LTTNG_DOMAIN_KERNEL; |
| 1415 | |
| 1416 | ret = lttng_ctl_ask_sessiond(&lsm, (void **) events); |
| 1417 | if (ret < 0) { |
| 1418 | return ret; |
| 1419 | } |
| 1420 | |
| 1421 | return ret / sizeof(struct lttng_event); |
| 1422 | } |
| 1423 | |
| 1424 | /* |
| 1425 | * Returns a human readable string describing |
| 1426 | * the error code (a negative value). |
| 1427 | */ |
| 1428 | const char *lttng_strerror(int code) |
| 1429 | { |
| 1430 | return error_get_str(code); |
| 1431 | } |
| 1432 | |
| 1433 | /* |
| 1434 | * Create a brand new session using name and url for destination. |
| 1435 | * |
| 1436 | * Returns LTTNG_OK on success or a negative error code. |
| 1437 | */ |
| 1438 | int lttng_create_session(const char *name, const char *url) |
| 1439 | { |
| 1440 | int ret; |
| 1441 | ssize_t size; |
| 1442 | struct lttcomm_session_msg lsm; |
| 1443 | struct lttng_uri *uris = NULL; |
| 1444 | |
| 1445 | if (name == NULL) { |
| 1446 | return -LTTNG_ERR_INVALID; |
| 1447 | } |
| 1448 | |
| 1449 | memset(&lsm, 0, sizeof(lsm)); |
| 1450 | |
| 1451 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
| 1452 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 1453 | |
| 1454 | /* There should never be a data URL */ |
| 1455 | size = uri_parse_str_urls(url, NULL, &uris); |
| 1456 | if (size < 0) { |
| 1457 | return -LTTNG_ERR_INVALID; |
| 1458 | } |
| 1459 | |
| 1460 | lsm.u.uri.size = size; |
| 1461 | |
| 1462 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
| 1463 | sizeof(struct lttng_uri) * size, NULL); |
| 1464 | |
| 1465 | free(uris); |
| 1466 | return ret; |
| 1467 | } |
| 1468 | |
| 1469 | /* |
| 1470 | * Destroy session using name. |
| 1471 | * Returns size of returned session payload data or a negative error code. |
| 1472 | */ |
| 1473 | int lttng_destroy_session(const char *session_name) |
| 1474 | { |
| 1475 | struct lttcomm_session_msg lsm; |
| 1476 | |
| 1477 | if (session_name == NULL) { |
| 1478 | return -LTTNG_ERR_INVALID; |
| 1479 | } |
| 1480 | |
| 1481 | memset(&lsm, 0, sizeof(lsm)); |
| 1482 | lsm.cmd_type = LTTNG_DESTROY_SESSION; |
| 1483 | |
| 1484 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 1485 | sizeof(lsm.session.name)); |
| 1486 | |
| 1487 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1488 | } |
| 1489 | |
| 1490 | /* |
| 1491 | * Ask the session daemon for all available sessions. |
| 1492 | * Sets the contents of the sessions array. |
| 1493 | * Returns the number of lttng_session entries in sessions; |
| 1494 | * on error, returns a negative value. |
| 1495 | */ |
| 1496 | int lttng_list_sessions(struct lttng_session **sessions) |
| 1497 | { |
| 1498 | int ret; |
| 1499 | struct lttcomm_session_msg lsm; |
| 1500 | |
| 1501 | memset(&lsm, 0, sizeof(lsm)); |
| 1502 | lsm.cmd_type = LTTNG_LIST_SESSIONS; |
| 1503 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) sessions); |
| 1504 | if (ret < 0) { |
| 1505 | return ret; |
| 1506 | } |
| 1507 | |
| 1508 | return ret / sizeof(struct lttng_session); |
| 1509 | } |
| 1510 | |
| 1511 | int lttng_set_session_shm_path(const char *session_name, |
| 1512 | const char *shm_path) |
| 1513 | { |
| 1514 | struct lttcomm_session_msg lsm; |
| 1515 | |
| 1516 | if (session_name == NULL) { |
| 1517 | return -LTTNG_ERR_INVALID; |
| 1518 | } |
| 1519 | |
| 1520 | memset(&lsm, 0, sizeof(lsm)); |
| 1521 | lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH; |
| 1522 | |
| 1523 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 1524 | sizeof(lsm.session.name)); |
| 1525 | lttng_ctl_copy_string(lsm.u.set_shm_path.shm_path, shm_path, |
| 1526 | sizeof(lsm.u.set_shm_path.shm_path)); |
| 1527 | |
| 1528 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * Ask the session daemon for all available domains of a session. |
| 1533 | * Sets the contents of the domains array. |
| 1534 | * Returns the number of lttng_domain entries in domains; |
| 1535 | * on error, returns a negative value. |
| 1536 | */ |
| 1537 | int lttng_list_domains(const char *session_name, |
| 1538 | struct lttng_domain **domains) |
| 1539 | { |
| 1540 | int ret; |
| 1541 | struct lttcomm_session_msg lsm; |
| 1542 | |
| 1543 | if (session_name == NULL) { |
| 1544 | return -LTTNG_ERR_INVALID; |
| 1545 | } |
| 1546 | |
| 1547 | memset(&lsm, 0, sizeof(lsm)); |
| 1548 | lsm.cmd_type = LTTNG_LIST_DOMAINS; |
| 1549 | |
| 1550 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 1551 | sizeof(lsm.session.name)); |
| 1552 | |
| 1553 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains); |
| 1554 | if (ret < 0) { |
| 1555 | return ret; |
| 1556 | } |
| 1557 | |
| 1558 | return ret / sizeof(struct lttng_domain); |
| 1559 | } |
| 1560 | |
| 1561 | /* |
| 1562 | * Ask the session daemon for all available channels of a session. |
| 1563 | * Sets the contents of the channels array. |
| 1564 | * Returns the number of lttng_channel entries in channels; |
| 1565 | * on error, returns a negative value. |
| 1566 | */ |
| 1567 | int lttng_list_channels(struct lttng_handle *handle, |
| 1568 | struct lttng_channel **channels) |
| 1569 | { |
| 1570 | int ret; |
| 1571 | struct lttcomm_session_msg lsm; |
| 1572 | |
| 1573 | if (handle == NULL) { |
| 1574 | return -LTTNG_ERR_INVALID; |
| 1575 | } |
| 1576 | |
| 1577 | memset(&lsm, 0, sizeof(lsm)); |
| 1578 | lsm.cmd_type = LTTNG_LIST_CHANNELS; |
| 1579 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1580 | sizeof(lsm.session.name)); |
| 1581 | |
| 1582 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1583 | |
| 1584 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels); |
| 1585 | if (ret < 0) { |
| 1586 | return ret; |
| 1587 | } |
| 1588 | |
| 1589 | return ret / sizeof(struct lttng_channel); |
| 1590 | } |
| 1591 | |
| 1592 | /* |
| 1593 | * Ask the session daemon for all available events of a session channel. |
| 1594 | * Sets the contents of the events array. |
| 1595 | * Returns the number of lttng_event entries in events; |
| 1596 | * on error, returns a negative value. |
| 1597 | */ |
| 1598 | int lttng_list_events(struct lttng_handle *handle, |
| 1599 | const char *channel_name, struct lttng_event **events) |
| 1600 | { |
| 1601 | int ret; |
| 1602 | struct lttcomm_session_msg lsm; |
| 1603 | |
| 1604 | /* Safety check. An handle and channel name are mandatory */ |
| 1605 | if (handle == NULL || channel_name == NULL) { |
| 1606 | return -LTTNG_ERR_INVALID; |
| 1607 | } |
| 1608 | |
| 1609 | memset(&lsm, 0, sizeof(lsm)); |
| 1610 | lsm.cmd_type = LTTNG_LIST_EVENTS; |
| 1611 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1612 | sizeof(lsm.session.name)); |
| 1613 | lttng_ctl_copy_string(lsm.u.list.channel_name, channel_name, |
| 1614 | sizeof(lsm.u.list.channel_name)); |
| 1615 | |
| 1616 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1617 | |
| 1618 | ret = lttng_ctl_ask_sessiond(&lsm, (void**) events); |
| 1619 | if (ret < 0) { |
| 1620 | return ret; |
| 1621 | } |
| 1622 | |
| 1623 | return ret / sizeof(struct lttng_event); |
| 1624 | } |
| 1625 | |
| 1626 | /* |
| 1627 | * Sets the tracing_group variable with name. |
| 1628 | * This function allocates memory pointed to by tracing_group. |
| 1629 | * On success, returns 0, on error, returns -1 (null name) or -ENOMEM. |
| 1630 | */ |
| 1631 | int lttng_set_tracing_group(const char *name) |
| 1632 | { |
| 1633 | if (name == NULL) { |
| 1634 | return -LTTNG_ERR_INVALID; |
| 1635 | } |
| 1636 | |
| 1637 | if (asprintf(&tracing_group, "%s", name) < 0) { |
| 1638 | return -LTTNG_ERR_FATAL; |
| 1639 | } |
| 1640 | |
| 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | /* |
| 1645 | * Returns size of returned session payload data or a negative error code. |
| 1646 | */ |
| 1647 | int lttng_calibrate(struct lttng_handle *handle, |
| 1648 | struct lttng_calibrate *calibrate) |
| 1649 | { |
| 1650 | struct lttcomm_session_msg lsm; |
| 1651 | |
| 1652 | /* Safety check. NULL pointer are forbidden */ |
| 1653 | if (handle == NULL || calibrate == NULL) { |
| 1654 | return -LTTNG_ERR_INVALID; |
| 1655 | } |
| 1656 | |
| 1657 | memset(&lsm, 0, sizeof(lsm)); |
| 1658 | lsm.cmd_type = LTTNG_CALIBRATE; |
| 1659 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1660 | |
| 1661 | memcpy(&lsm.u.calibrate, calibrate, sizeof(lsm.u.calibrate)); |
| 1662 | |
| 1663 | return lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1664 | } |
| 1665 | |
| 1666 | /* |
| 1667 | * Set default channel attributes. |
| 1668 | * If either or both of the arguments are null, attr content is zeroe'd. |
| 1669 | */ |
| 1670 | void lttng_channel_set_default_attr(struct lttng_domain *domain, |
| 1671 | struct lttng_channel_attr *attr) |
| 1672 | { |
| 1673 | /* Safety check */ |
| 1674 | if (attr == NULL || domain == NULL) { |
| 1675 | return; |
| 1676 | } |
| 1677 | |
| 1678 | memset(attr, 0, sizeof(struct lttng_channel_attr)); |
| 1679 | |
| 1680 | /* Same for all domains. */ |
| 1681 | attr->overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 1682 | attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE; |
| 1683 | attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT; |
| 1684 | |
| 1685 | switch (domain->type) { |
| 1686 | case LTTNG_DOMAIN_KERNEL: |
| 1687 | attr->switch_timer_interval = DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER; |
| 1688 | attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER; |
| 1689 | attr->subbuf_size = default_get_kernel_channel_subbuf_size(); |
| 1690 | attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
| 1691 | attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 1692 | break; |
| 1693 | case LTTNG_DOMAIN_UST: |
| 1694 | switch (domain->buf_type) { |
| 1695 | case LTTNG_BUFFER_PER_UID: |
| 1696 | attr->subbuf_size = default_get_ust_uid_channel_subbuf_size(); |
| 1697 | attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM; |
| 1698 | attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT; |
| 1699 | attr->switch_timer_interval = DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER; |
| 1700 | attr->read_timer_interval = DEFAULT_UST_UID_CHANNEL_READ_TIMER; |
| 1701 | break; |
| 1702 | case LTTNG_BUFFER_PER_PID: |
| 1703 | default: |
| 1704 | attr->subbuf_size = default_get_ust_pid_channel_subbuf_size(); |
| 1705 | attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM; |
| 1706 | attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT; |
| 1707 | attr->switch_timer_interval = DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER; |
| 1708 | attr->read_timer_interval = DEFAULT_UST_PID_CHANNEL_READ_TIMER; |
| 1709 | break; |
| 1710 | } |
| 1711 | default: |
| 1712 | /* Default behavior: leave set to 0. */ |
| 1713 | break; |
| 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | /* |
| 1718 | * Check if session daemon is alive. |
| 1719 | * |
| 1720 | * Return 1 if alive or 0 if not. |
| 1721 | * On error returns a negative value. |
| 1722 | */ |
| 1723 | int lttng_session_daemon_alive(void) |
| 1724 | { |
| 1725 | int ret; |
| 1726 | |
| 1727 | ret = set_session_daemon_path(); |
| 1728 | if (ret < 0) { |
| 1729 | /* Error */ |
| 1730 | return ret; |
| 1731 | } |
| 1732 | |
| 1733 | if (*sessiond_sock_path == '\0') { |
| 1734 | /* |
| 1735 | * No socket path set. Weird error which means the constructor was not |
| 1736 | * called. |
| 1737 | */ |
| 1738 | assert(0); |
| 1739 | } |
| 1740 | |
| 1741 | ret = try_connect_sessiond(sessiond_sock_path); |
| 1742 | if (ret < 0) { |
| 1743 | /* Not alive */ |
| 1744 | return 0; |
| 1745 | } |
| 1746 | |
| 1747 | /* Is alive */ |
| 1748 | return 1; |
| 1749 | } |
| 1750 | |
| 1751 | /* |
| 1752 | * Set URL for a consumer for a session and domain. |
| 1753 | * |
| 1754 | * Return 0 on success, else a negative value. |
| 1755 | */ |
| 1756 | int lttng_set_consumer_url(struct lttng_handle *handle, |
| 1757 | const char *control_url, const char *data_url) |
| 1758 | { |
| 1759 | int ret; |
| 1760 | ssize_t size; |
| 1761 | struct lttcomm_session_msg lsm; |
| 1762 | struct lttng_uri *uris = NULL; |
| 1763 | |
| 1764 | if (handle == NULL || (control_url == NULL && data_url == NULL)) { |
| 1765 | return -LTTNG_ERR_INVALID; |
| 1766 | } |
| 1767 | |
| 1768 | memset(&lsm, 0, sizeof(lsm)); |
| 1769 | |
| 1770 | lsm.cmd_type = LTTNG_SET_CONSUMER_URI; |
| 1771 | |
| 1772 | lttng_ctl_copy_string(lsm.session.name, handle->session_name, |
| 1773 | sizeof(lsm.session.name)); |
| 1774 | lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain); |
| 1775 | |
| 1776 | size = uri_parse_str_urls(control_url, data_url, &uris); |
| 1777 | if (size < 0) { |
| 1778 | return -LTTNG_ERR_INVALID; |
| 1779 | } |
| 1780 | |
| 1781 | lsm.u.uri.size = size; |
| 1782 | |
| 1783 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
| 1784 | sizeof(struct lttng_uri) * size, NULL); |
| 1785 | |
| 1786 | free(uris); |
| 1787 | return ret; |
| 1788 | } |
| 1789 | |
| 1790 | /* |
| 1791 | * [OBSOLETE] |
| 1792 | */ |
| 1793 | int lttng_enable_consumer(struct lttng_handle *handle) |
| 1794 | { |
| 1795 | return -ENOSYS; |
| 1796 | } |
| 1797 | |
| 1798 | /* |
| 1799 | * [OBSOLETE] |
| 1800 | */ |
| 1801 | int lttng_disable_consumer(struct lttng_handle *handle) |
| 1802 | { |
| 1803 | return -ENOSYS; |
| 1804 | } |
| 1805 | |
| 1806 | /* |
| 1807 | * This is an extension of create session that is ONLY and SHOULD only be used |
| 1808 | * by the lttng command line program. It exists to avoid using URI parsing in |
| 1809 | * the lttng client. |
| 1810 | * |
| 1811 | * We need the date and time for the trace path subdirectory for the case where |
| 1812 | * the user does NOT define one using either -o or -U. Using the normal |
| 1813 | * lttng_create_session API call, we have no clue on the session daemon side if |
| 1814 | * the URL was generated automatically by the client or define by the user. |
| 1815 | * |
| 1816 | * So this function "wrapper" is hidden from the public API, takes the datetime |
| 1817 | * string and appends it if necessary to the URI subdirectory before sending it |
| 1818 | * to the session daemon. |
| 1819 | * |
| 1820 | * With this extra function, the lttng_create_session call behavior is not |
| 1821 | * changed and the timestamp is appended to the URI on the session daemon side |
| 1822 | * if necessary. |
| 1823 | */ |
| 1824 | int _lttng_create_session_ext(const char *name, const char *url, |
| 1825 | const char *datetime) |
| 1826 | { |
| 1827 | int ret; |
| 1828 | ssize_t size; |
| 1829 | struct lttcomm_session_msg lsm; |
| 1830 | struct lttng_uri *uris = NULL; |
| 1831 | |
| 1832 | if (name == NULL || datetime == NULL) { |
| 1833 | return -LTTNG_ERR_INVALID; |
| 1834 | } |
| 1835 | |
| 1836 | memset(&lsm, 0, sizeof(lsm)); |
| 1837 | |
| 1838 | lsm.cmd_type = LTTNG_CREATE_SESSION; |
| 1839 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 1840 | |
| 1841 | /* There should never be a data URL */ |
| 1842 | size = uri_parse_str_urls(url, NULL, &uris); |
| 1843 | if (size < 0) { |
| 1844 | ret = -LTTNG_ERR_INVALID; |
| 1845 | goto error; |
| 1846 | } |
| 1847 | |
| 1848 | lsm.u.uri.size = size; |
| 1849 | |
| 1850 | if (size > 0 && uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) { |
| 1851 | /* Don't append datetime if the name was automatically created. */ |
| 1852 | if (strncmp(name, DEFAULT_SESSION_NAME "-", |
| 1853 | strlen(DEFAULT_SESSION_NAME) + 1)) { |
| 1854 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", |
| 1855 | name, datetime); |
| 1856 | } else { |
| 1857 | ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s", name); |
| 1858 | } |
| 1859 | if (ret < 0) { |
| 1860 | PERROR("snprintf uri subdir"); |
| 1861 | ret = -LTTNG_ERR_FATAL; |
| 1862 | goto error; |
| 1863 | } |
| 1864 | } |
| 1865 | |
| 1866 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
| 1867 | sizeof(struct lttng_uri) * size, NULL); |
| 1868 | |
| 1869 | error: |
| 1870 | free(uris); |
| 1871 | return ret; |
| 1872 | } |
| 1873 | |
| 1874 | /* |
| 1875 | * For a given session name, this call checks if the data is ready to be read |
| 1876 | * or is still being extracted by the consumer(s) hence not ready to be used by |
| 1877 | * any readers. |
| 1878 | */ |
| 1879 | int lttng_data_pending(const char *session_name) |
| 1880 | { |
| 1881 | int ret; |
| 1882 | struct lttcomm_session_msg lsm; |
| 1883 | |
| 1884 | if (session_name == NULL) { |
| 1885 | return -LTTNG_ERR_INVALID; |
| 1886 | } |
| 1887 | |
| 1888 | memset(&lsm, 0, sizeof(lsm)); |
| 1889 | lsm.cmd_type = LTTNG_DATA_PENDING; |
| 1890 | |
| 1891 | lttng_ctl_copy_string(lsm.session.name, session_name, |
| 1892 | sizeof(lsm.session.name)); |
| 1893 | |
| 1894 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
| 1895 | |
| 1896 | /* |
| 1897 | * The lttng_ctl_ask_sessiond function negate the return code if it's not |
| 1898 | * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning |
| 1899 | * that the data is available. Yes it is hackish but for now this is the |
| 1900 | * only way. |
| 1901 | */ |
| 1902 | if (ret == -1) { |
| 1903 | ret = 1; |
| 1904 | } |
| 1905 | |
| 1906 | return ret; |
| 1907 | } |
| 1908 | |
| 1909 | /* |
| 1910 | * Create a session exclusively used for snapshot. |
| 1911 | * |
| 1912 | * Returns LTTNG_OK on success or a negative error code. |
| 1913 | */ |
| 1914 | int lttng_create_session_snapshot(const char *name, const char *snapshot_url) |
| 1915 | { |
| 1916 | int ret; |
| 1917 | ssize_t size; |
| 1918 | struct lttcomm_session_msg lsm; |
| 1919 | struct lttng_uri *uris = NULL; |
| 1920 | |
| 1921 | if (name == NULL) { |
| 1922 | return -LTTNG_ERR_INVALID; |
| 1923 | } |
| 1924 | |
| 1925 | memset(&lsm, 0, sizeof(lsm)); |
| 1926 | |
| 1927 | lsm.cmd_type = LTTNG_CREATE_SESSION_SNAPSHOT; |
| 1928 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 1929 | |
| 1930 | size = uri_parse_str_urls(snapshot_url, NULL, &uris); |
| 1931 | if (size < 0) { |
| 1932 | return -LTTNG_ERR_INVALID; |
| 1933 | } |
| 1934 | |
| 1935 | lsm.u.uri.size = size; |
| 1936 | |
| 1937 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
| 1938 | sizeof(struct lttng_uri) * size, NULL); |
| 1939 | |
| 1940 | free(uris); |
| 1941 | return ret; |
| 1942 | } |
| 1943 | |
| 1944 | /* |
| 1945 | * Create a session exclusively used for live. |
| 1946 | * |
| 1947 | * Returns LTTNG_OK on success or a negative error code. |
| 1948 | */ |
| 1949 | int lttng_create_session_live(const char *name, const char *url, |
| 1950 | unsigned int timer_interval) |
| 1951 | { |
| 1952 | int ret; |
| 1953 | ssize_t size; |
| 1954 | struct lttcomm_session_msg lsm; |
| 1955 | struct lttng_uri *uris = NULL; |
| 1956 | |
| 1957 | if (name == NULL) { |
| 1958 | return -LTTNG_ERR_INVALID; |
| 1959 | } |
| 1960 | |
| 1961 | memset(&lsm, 0, sizeof(lsm)); |
| 1962 | |
| 1963 | lsm.cmd_type = LTTNG_CREATE_SESSION_LIVE; |
| 1964 | lttng_ctl_copy_string(lsm.session.name, name, sizeof(lsm.session.name)); |
| 1965 | |
| 1966 | if (url) { |
| 1967 | size = uri_parse_str_urls(url, NULL, &uris); |
| 1968 | if (size <= 0) { |
| 1969 | ret = -LTTNG_ERR_INVALID; |
| 1970 | goto end; |
| 1971 | } |
| 1972 | |
| 1973 | /* file:// is not accepted for live session. */ |
| 1974 | if (uris[0].dtype == LTTNG_DST_PATH) { |
| 1975 | ret = -LTTNG_ERR_INVALID; |
| 1976 | goto end; |
| 1977 | } |
| 1978 | } else { |
| 1979 | size = 0; |
| 1980 | } |
| 1981 | |
| 1982 | lsm.u.session_live.nb_uri = size; |
| 1983 | lsm.u.session_live.timer_interval = timer_interval; |
| 1984 | |
| 1985 | ret = lttng_ctl_ask_sessiond_varlen(&lsm, uris, |
| 1986 | sizeof(struct lttng_uri) * size, NULL); |
| 1987 | |
| 1988 | end: |
| 1989 | free(uris); |
| 1990 | return ret; |
| 1991 | } |
| 1992 | |
| 1993 | /* |
| 1994 | * lib constructor |
| 1995 | */ |
| 1996 | static void __attribute__((constructor)) init() |
| 1997 | { |
| 1998 | /* Set default session group */ |
| 1999 | lttng_set_tracing_group(DEFAULT_TRACING_GROUP); |
| 2000 | } |
| 2001 | |
| 2002 | /* |
| 2003 | * lib destructor |
| 2004 | */ |
| 2005 | static void __attribute__((destructor)) lttng_ctl_exit() |
| 2006 | { |
| 2007 | free(tracing_group); |
| 2008 | } |