| 1 | /* |
| 2 | * Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette |
| 3 | * Copyright (C) 2011 Ericsson AB |
| 4 | * David Goulet <david.goulet@polymtl.ca> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #define _GNU_SOURCE |
| 22 | #include <dirent.h> |
| 23 | #include <fcntl.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <unistd.h> |
| 28 | |
| 29 | #include "libustcomm.h" |
| 30 | #include "libustctl.h" |
| 31 | #include "lttngerr.h" |
| 32 | |
| 33 | /* |
| 34 | * do_cmd |
| 35 | * |
| 36 | * Execute command using ustcomm API. |
| 37 | */ |
| 38 | static int do_cmd(int sock, const struct ustcomm_header *req_header, |
| 39 | const char *req_data, struct ustcomm_header *res_header, char **res_data) |
| 40 | { |
| 41 | int result, saved_errno = 0; |
| 42 | char *recv_buf; |
| 43 | |
| 44 | recv_buf = malloc(USTCOMM_BUFFER_SIZE); |
| 45 | if (!recv_buf) { |
| 46 | saved_errno = ENOMEM; |
| 47 | goto out; |
| 48 | } |
| 49 | |
| 50 | result = ustcomm_req(sock, req_header, req_data, res_header, recv_buf); |
| 51 | if (result > 0) { |
| 52 | saved_errno = -res_header->result; |
| 53 | if (res_header->size == 0 || saved_errno > 0) { |
| 54 | free(recv_buf); |
| 55 | } else { |
| 56 | if (res_data) { |
| 57 | *res_data = recv_buf; |
| 58 | } else { |
| 59 | free(recv_buf); |
| 60 | } |
| 61 | } |
| 62 | } else { |
| 63 | ERR("ustcomm req failed"); |
| 64 | if (result == 0) { |
| 65 | saved_errno = ENOTCONN; |
| 66 | } else { |
| 67 | saved_errno = -result; |
| 68 | } |
| 69 | free(recv_buf); |
| 70 | } |
| 71 | |
| 72 | out: |
| 73 | errno = saved_errno; |
| 74 | if (errno) { |
| 75 | return -1; |
| 76 | } |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * realloc_pid_list |
| 83 | */ |
| 84 | static int realloc_pid_list(pid_t **pid_list, unsigned int *pid_list_size) |
| 85 | { |
| 86 | pid_t *new_pid_list; |
| 87 | unsigned int new_pid_list_size = 2 * (*pid_list_size); |
| 88 | |
| 89 | new_pid_list = realloc(*pid_list, new_pid_list_size * sizeof(pid_t)); |
| 90 | if (!*new_pid_list) { |
| 91 | return -1; |
| 92 | } |
| 93 | |
| 94 | *pid_list = new_pid_list; |
| 95 | *pid_list_size = new_pid_list_size; |
| 96 | |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * get_pids_in_dir |
| 102 | * |
| 103 | * Set pid_list with all pid in the dir. |
| 104 | */ |
| 105 | static int get_pids_in_dir(DIR *dir, pid_t **pid_list, |
| 106 | unsigned int *pid_list_index, unsigned int *pid_list_size) |
| 107 | { |
| 108 | struct dirent *dirent; |
| 109 | pid_t read_pid; |
| 110 | |
| 111 | while ((dirent = readdir(dir))) { |
| 112 | if (!strcmp(dirent->d_name, ".") || |
| 113 | !strcmp(dirent->d_name, "..") || |
| 114 | !strcmp(dirent->d_name, "ust-consumer") || |
| 115 | dirent->d_type == DT_DIR) { |
| 116 | continue; |
| 117 | } |
| 118 | |
| 119 | if (ustcomm_is_socket_live(dirent->d_name, &read_pid)) { |
| 120 | (*pid_list)[(*pid_list_index)++] = (long) read_pid; |
| 121 | if (*pid_list_index == *pid_list_size) { |
| 122 | if (realloc_pid_list(pid_list, pid_list_size)) { |
| 123 | return -1; |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | (*pid_list)[*pid_list_index] = 0; /* Array end */ |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * get_pids_non_root |
| 136 | */ |
| 137 | static pid_t *get_pids_non_root(void) |
| 138 | { |
| 139 | char *dir_name; |
| 140 | DIR *dir; |
| 141 | unsigned int pid_list_index = 0, pid_list_size = 1; |
| 142 | pid_t *pid_list = NULL; |
| 143 | |
| 144 | dir_name = ustcomm_user_sock_dir(); |
| 145 | if (!dir_name) { |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | dir = opendir(dir_name); |
| 150 | if (!dir) { |
| 151 | goto free_dir_name; |
| 152 | } |
| 153 | |
| 154 | pid_list = malloc(pid_list_size * sizeof(pid_t)); |
| 155 | if (!pid_list) { |
| 156 | goto close_dir; |
| 157 | } |
| 158 | |
| 159 | if (get_pids_in_dir(dir, &pid_list, &pid_list_index, &pid_list_size)) { |
| 160 | /* if any errors are encountered, force freeing of the list */ |
| 161 | pid_list[0] = 0; |
| 162 | } |
| 163 | |
| 164 | close_dir: |
| 165 | closedir(dir); |
| 166 | |
| 167 | free_dir_name: |
| 168 | free(dir_name); |
| 169 | |
| 170 | return pid_list; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * get_pids_root |
| 175 | */ |
| 176 | static pid_t *get_pids_root(void) |
| 177 | { |
| 178 | char *dir_name; |
| 179 | DIR *tmp_dir, *dir; |
| 180 | unsigned int pid_list_index = 0, pid_list_size = 1; |
| 181 | pid_t *pid_list = NULL; |
| 182 | struct dirent *dirent; |
| 183 | int result; |
| 184 | |
| 185 | tmp_dir = opendir(USER_TMP_DIR); |
| 186 | if (!tmp_dir) { |
| 187 | return NULL; |
| 188 | } |
| 189 | |
| 190 | pid_list = malloc(pid_list_size * sizeof(pid_t)); |
| 191 | if (!pid_list) { |
| 192 | goto close_tmp_dir; |
| 193 | } |
| 194 | |
| 195 | while ((dirent = readdir(tmp_dir))) { |
| 196 | /* Compare the dir to check for the USER_SOCK_DIR_BASE prefix */ |
| 197 | if (!strncmp(dirent->d_name, USER_SOCK_DIR_BASE, |
| 198 | strlen(USER_SOCK_DIR_BASE))) { |
| 199 | if (asprintf(&dir_name, USER_TMP_DIR "/%s", dirent->d_name) < 0) { |
| 200 | goto close_tmp_dir; |
| 201 | } |
| 202 | |
| 203 | dir = opendir(dir_name); |
| 204 | free(dir_name); |
| 205 | if (!dir) { |
| 206 | continue; |
| 207 | } |
| 208 | |
| 209 | result = get_pids_in_dir(dir, &pid_list, &pid_list_index, &pid_list_size); |
| 210 | closedir(dir); |
| 211 | if (result) { |
| 212 | /* |
| 213 | * if any errors are encountered, |
| 214 | * force freeing of the list |
| 215 | */ |
| 216 | pid_list[0] = 0; |
| 217 | break; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | close_tmp_dir: |
| 223 | closedir(tmp_dir); |
| 224 | return pid_list; |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * ustctl_get_subbuf_num_size |
| 229 | */ |
| 230 | static int ustctl_get_subbuf_num_size(int sock, const char *trace, |
| 231 | const char *channel, int *num, int *size) |
| 232 | { |
| 233 | struct ustcomm_header req_header, res_header; |
| 234 | struct ustcomm_channel_info ch_inf, *ch_inf_res; |
| 235 | int result; |
| 236 | |
| 237 | |
| 238 | result = ustcomm_pack_channel_info(&req_header, |
| 239 | &ch_inf, trace, channel); |
| 240 | if (result < 0) { |
| 241 | errno = -result; |
| 242 | return -1; |
| 243 | } |
| 244 | |
| 245 | req_header.command = GET_SUBBUF_NUM_SIZE; |
| 246 | |
| 247 | result = do_cmd(sock, &req_header, (char *)&ch_inf, |
| 248 | &res_header, (char **)&ch_inf_res); |
| 249 | if (result < 0) { |
| 250 | return -1; |
| 251 | } |
| 252 | |
| 253 | *num = ch_inf_res->subbuf_num; |
| 254 | *size = ch_inf_res->subbuf_size; |
| 255 | |
| 256 | free(ch_inf_res); |
| 257 | |
| 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * do_trace_cmd |
| 263 | * |
| 264 | * Do all trace action command |
| 265 | */ |
| 266 | static int do_trace_cmd(int sock, const char *trace, int command) |
| 267 | { |
| 268 | struct ustcomm_header req_header, res_header; |
| 269 | struct ustcomm_single_field trace_inf; |
| 270 | int result; |
| 271 | |
| 272 | result = ustcomm_pack_single_field(&req_header, &trace_inf, trace); |
| 273 | if (result < 0) { |
| 274 | errno = -result; |
| 275 | return -1; |
| 276 | } |
| 277 | |
| 278 | req_header.command = command; |
| 279 | |
| 280 | return do_cmd(sock, &req_header, (char *)&trace_inf, &res_header, NULL); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * ustctl_connect_pid |
| 285 | * |
| 286 | * Connect to PID |
| 287 | */ |
| 288 | int ustctl_connect_pid(pid_t pid) |
| 289 | { |
| 290 | int sock; |
| 291 | |
| 292 | if (ustcomm_connect_app(pid, &sock)) { |
| 293 | ERR("could not connect to PID %u", (unsigned int) pid); |
| 294 | errno = ENOTCONN; |
| 295 | return -1; |
| 296 | } |
| 297 | |
| 298 | return sock; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * ustctl_get_online_pids |
| 303 | * |
| 304 | * Return list of online pids. |
| 305 | */ |
| 306 | pid_t *ustctl_get_online_pids(void) |
| 307 | { |
| 308 | pid_t *pid_list; |
| 309 | |
| 310 | if (geteuid()) { |
| 311 | pid_list = get_pids_non_root(); |
| 312 | } else { |
| 313 | pid_list = get_pids_root(); |
| 314 | } |
| 315 | |
| 316 | if (pid_list && pid_list[0] == 0) { |
| 317 | /* No PID at all */ |
| 318 | free(pid_list); |
| 319 | pid_list = NULL; |
| 320 | } |
| 321 | |
| 322 | return pid_list; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Sets ust_marker state (USTCTL_MS_ON or USTCTL_MS_OFF). |
| 327 | * |
| 328 | * @param mn Marker name |
| 329 | * @param state Marker's new state |
| 330 | * @param pid Traced process ID |
| 331 | * @return 0 if successful, or errors {USTCTL_ERR_GEN, USTCTL_ERR_ARG} |
| 332 | */ |
| 333 | int ustctl_set_marker_state(int sock, const char *trace, const char *channel, |
| 334 | const char *ust_marker, int state) |
| 335 | { |
| 336 | struct ustcomm_header req_header, res_header; |
| 337 | struct ustcomm_ust_marker_info ust_marker_inf; |
| 338 | int result; |
| 339 | |
| 340 | result = ustcomm_pack_ust_marker_info(&req_header, &ust_marker_inf, |
| 341 | trace, channel, ust_marker); |
| 342 | if (result < 0) { |
| 343 | errno = -result; |
| 344 | return -1; |
| 345 | } |
| 346 | |
| 347 | req_header.command = state ? ENABLE_MARKER : DISABLE_MARKER; |
| 348 | |
| 349 | return do_cmd(sock, &req_header, (char *)&ust_marker_inf, &res_header, NULL); |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Set subbuffer size. |
| 354 | * |
| 355 | * @param channel_size Channel name and size |
| 356 | * @param pid Traced process ID |
| 357 | * @return 0 if successful, or error |
| 358 | */ |
| 359 | int ustctl_set_subbuf_size(int sock, const char *trace, const char *channel, |
| 360 | unsigned int subbuf_size) |
| 361 | { |
| 362 | struct ustcomm_header req_header, res_header; |
| 363 | struct ustcomm_channel_info ch_inf; |
| 364 | int result; |
| 365 | |
| 366 | result = ustcomm_pack_channel_info(&req_header, &ch_inf, |
| 367 | trace, channel); |
| 368 | if (result < 0) { |
| 369 | errno = -result; |
| 370 | return -1; |
| 371 | } |
| 372 | |
| 373 | req_header.command = SET_SUBBUF_SIZE; |
| 374 | ch_inf.subbuf_size = subbuf_size; |
| 375 | |
| 376 | return do_cmd(sock, &req_header, (char *)&ch_inf, &res_header, NULL); |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * Set subbuffer num. |
| 381 | * |
| 382 | * @param channel_num Channel name and num |
| 383 | * @param pid Traced process ID |
| 384 | * @return 0 if successful, or error |
| 385 | */ |
| 386 | int ustctl_set_subbuf_num(int sock, const char *trace, const char *channel, |
| 387 | unsigned int num) |
| 388 | { |
| 389 | struct ustcomm_header req_header, res_header; |
| 390 | struct ustcomm_channel_info ch_inf; |
| 391 | int result; |
| 392 | |
| 393 | result = ustcomm_pack_channel_info(&req_header, |
| 394 | &ch_inf, trace, channel); |
| 395 | if (result < 0) { |
| 396 | errno = -result; |
| 397 | return -1; |
| 398 | } |
| 399 | |
| 400 | req_header.command = SET_SUBBUF_NUM; |
| 401 | ch_inf.subbuf_num = num; |
| 402 | |
| 403 | return do_cmd(sock, &req_header, (char *)&ch_inf, &res_header, NULL); |
| 404 | |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Get subbuffer num. |
| 409 | * |
| 410 | * @param channel Channel name |
| 411 | * @param pid Traced process ID |
| 412 | * @return subbuf cnf if successful, or error |
| 413 | */ |
| 414 | int ustctl_get_subbuf_num(int sock, const char *trace, const char *channel) |
| 415 | { |
| 416 | int num, size, result; |
| 417 | |
| 418 | result = ustctl_get_subbuf_num_size(sock, trace, channel, &num, &size); |
| 419 | if (result < 0) { |
| 420 | errno = -result; |
| 421 | return -1; |
| 422 | } |
| 423 | |
| 424 | return num; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Get subbuffer size. |
| 429 | * |
| 430 | * @param channel Channel name |
| 431 | * @param pid Traced process ID |
| 432 | * @return subbuf size if successful, or error |
| 433 | */ |
| 434 | int ustctl_get_subbuf_size(int sock, const char *trace, const char *channel) |
| 435 | { |
| 436 | int num, size, result; |
| 437 | |
| 438 | result = ustctl_get_subbuf_num_size(sock, trace, channel, &num, &size); |
| 439 | if (result < 0) { |
| 440 | errno = -result; |
| 441 | return -1; |
| 442 | } |
| 443 | |
| 444 | return size; |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Destroys an UST trace according to a PID. |
| 449 | * |
| 450 | * @param pid Traced process ID |
| 451 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 452 | */ |
| 453 | int ustctl_destroy_trace(int sock, const char *trace) |
| 454 | { |
| 455 | return do_trace_cmd(sock, trace, DESTROY_TRACE); |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Starts an UST trace (and setups it) according to a PID. |
| 460 | * |
| 461 | * @param pid Traced process ID |
| 462 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 463 | */ |
| 464 | int ustctl_setup_and_start(int sock, const char *trace) |
| 465 | { |
| 466 | return do_trace_cmd(sock, trace, START); |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | * Creates an UST trace according to a PID. |
| 471 | * |
| 472 | * @param pid Traced process ID |
| 473 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 474 | */ |
| 475 | int ustctl_create_trace(int sock, const char *trace) |
| 476 | { |
| 477 | return do_trace_cmd(sock, trace, CREATE_TRACE); |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Starts an UST trace according to a PID. |
| 482 | * |
| 483 | * @param pid Traced process ID |
| 484 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 485 | */ |
| 486 | int ustctl_start_trace(int sock, const char *trace) |
| 487 | { |
| 488 | return do_trace_cmd(sock, trace, START_TRACE); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Alloc an UST trace according to a PID. |
| 493 | * |
| 494 | * @param pid Traced process ID |
| 495 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 496 | */ |
| 497 | int ustctl_alloc_trace(int sock, const char *trace) |
| 498 | { |
| 499 | return do_trace_cmd(sock, trace, ALLOC_TRACE); |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * ustctl_force_switch |
| 504 | * |
| 505 | * Force switch buffer in libust |
| 506 | */ |
| 507 | int ustctl_force_switch(int sock, const char *trace) |
| 508 | { |
| 509 | return do_trace_cmd(sock, trace, FORCE_SUBBUF_SWITCH); |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Stops an UST trace according to a PID. |
| 514 | * |
| 515 | * @param pid Traced process ID |
| 516 | * @return 0 if successful, or error USTCTL_ERR_GEN |
| 517 | */ |
| 518 | int ustctl_stop_trace(int sock, const char *trace) |
| 519 | { |
| 520 | return do_trace_cmd(sock, trace, STOP_TRACE); |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Counts newlines ('\n') in a string. |
| 525 | * |
| 526 | * @param str String to search in |
| 527 | * @return Total newlines count |
| 528 | */ |
| 529 | unsigned int ustctl_count_nl(const char *str) |
| 530 | { |
| 531 | unsigned int i = 0, tot = 0; |
| 532 | |
| 533 | while (str[i] != '\0') { |
| 534 | if (str[i] == '\n') { |
| 535 | ++tot; |
| 536 | } |
| 537 | ++i; |
| 538 | } |
| 539 | |
| 540 | return tot; |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * Frees a CMSF array. |
| 545 | * |
| 546 | * @param cmsf CMSF array to free |
| 547 | * @return 0 if successful, or error USTCTL_ERR_ARG |
| 548 | */ |
| 549 | int ustctl_free_cmsf(struct ustctl_marker_status *cmsf) |
| 550 | { |
| 551 | if (cmsf == NULL) { |
| 552 | return -1; |
| 553 | } |
| 554 | |
| 555 | unsigned int i = 0; |
| 556 | while (cmsf[i].channel != NULL) { |
| 557 | free(cmsf[i].channel); |
| 558 | free(cmsf[i].ust_marker); |
| 559 | free(cmsf[i].fs); |
| 560 | ++i; |
| 561 | } |
| 562 | free(cmsf); |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Gets channel/ust_marker/state/format string for a given PID. |
| 569 | * |
| 570 | * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller |
| 571 | * frees with `ustctl_free_cmsf') |
| 572 | * @param pid Targeted PID |
| 573 | * @return 0 if successful, or -1 on error |
| 574 | */ |
| 575 | int ustctl_get_cmsf(int sock, struct ustctl_marker_status **cmsf) |
| 576 | { |
| 577 | struct ustcomm_header req_header, res_header; |
| 578 | char *big_str = NULL; |
| 579 | int result; |
| 580 | struct ustctl_marker_status *tmp_cmsf = NULL; |
| 581 | unsigned int i = 0, cmsf_ind = 0; |
| 582 | |
| 583 | if (cmsf == NULL) { |
| 584 | return -1; |
| 585 | } |
| 586 | |
| 587 | req_header.command = LIST_MARKERS; |
| 588 | req_header.size = 0; |
| 589 | |
| 590 | result = ustcomm_send(sock, &req_header, NULL); |
| 591 | if (result <= 0) { |
| 592 | ERR("error while requesting ust_marker list"); |
| 593 | return -1; |
| 594 | } |
| 595 | |
| 596 | result = ustcomm_recv_alloc(sock, &res_header, &big_str); |
| 597 | if (result <= 0) { |
| 598 | ERR("error while receiving ust_marker list"); |
| 599 | return -1; |
| 600 | } |
| 601 | |
| 602 | tmp_cmsf = (struct ustctl_marker_status *) malloc(sizeof(struct ustctl_marker_status) * |
| 603 | (ustctl_count_nl(big_str) + 1)); |
| 604 | if (tmp_cmsf == NULL) { |
| 605 | ERR("Failed to allocate CMSF array"); |
| 606 | return -1; |
| 607 | } |
| 608 | |
| 609 | /* Parse received reply string (format: "[chan]/[mark] [st] [fs]"): */ |
| 610 | while (big_str[i] != '\0') { |
| 611 | char state; |
| 612 | |
| 613 | sscanf(big_str + i, "ust_marker: %a[^/]/%a[^ ] %c %a[^\n]", |
| 614 | &tmp_cmsf[cmsf_ind].channel, |
| 615 | &tmp_cmsf[cmsf_ind].ust_marker, |
| 616 | &state, |
| 617 | &tmp_cmsf[cmsf_ind].fs); |
| 618 | tmp_cmsf[cmsf_ind].state = (state == USTCTL_MS_CHR_ON ? |
| 619 | USTCTL_MS_ON : USTCTL_MS_OFF); /* Marker state */ |
| 620 | |
| 621 | while (big_str[i] != '\n') { |
| 622 | ++i; /* Go to next '\n' */ |
| 623 | } |
| 624 | ++i; /* Skip current pointed '\n' */ |
| 625 | ++cmsf_ind; |
| 626 | } |
| 627 | tmp_cmsf[cmsf_ind].channel = NULL; |
| 628 | tmp_cmsf[cmsf_ind].ust_marker = NULL; |
| 629 | tmp_cmsf[cmsf_ind].fs = NULL; |
| 630 | |
| 631 | *cmsf = tmp_cmsf; |
| 632 | |
| 633 | free(big_str); |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Frees a TES array. |
| 639 | * |
| 640 | * @param tes TES array to free |
| 641 | * @return 0 if successful, or error USTCTL_ERR_ARG |
| 642 | */ |
| 643 | int ustctl_free_tes(struct ustctl_trace_event_status *tes) |
| 644 | { |
| 645 | if (tes == NULL) { |
| 646 | return USTCTL_ERR_ARG; |
| 647 | } |
| 648 | |
| 649 | unsigned int i = 0; |
| 650 | while (tes[i].name != NULL) { |
| 651 | free(tes[i].name); |
| 652 | ++i; |
| 653 | } |
| 654 | free(tes); |
| 655 | |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | /* |
| 660 | * Gets trace_events string for a given PID. |
| 661 | * |
| 662 | * @param tes Pointer to TES array to be filled (callee allocates, caller |
| 663 | * frees with `ustctl_free_tes') |
| 664 | * @param pid Targeted PID |
| 665 | * @return 0 if successful, or -1 on error |
| 666 | */ |
| 667 | int ustctl_get_tes(int sock, struct ustctl_trace_event_status **tes) |
| 668 | { |
| 669 | struct ustcomm_header req_header, res_header; |
| 670 | char *big_str = NULL; |
| 671 | int result; |
| 672 | struct ustctl_trace_event_status *tmp_tes = NULL; |
| 673 | unsigned int i = 0, tes_ind = 0; |
| 674 | |
| 675 | if (tes == NULL) { |
| 676 | return -1; |
| 677 | } |
| 678 | |
| 679 | req_header.command = LIST_TRACE_EVENTS; |
| 680 | req_header.size = 0; |
| 681 | |
| 682 | result = ustcomm_send(sock, &req_header, NULL); |
| 683 | if (result != 1) { |
| 684 | ERR("error while requesting trace_event list"); |
| 685 | return -1; |
| 686 | } |
| 687 | |
| 688 | result = ustcomm_recv_alloc(sock, &res_header, &big_str); |
| 689 | if (result != 1) { |
| 690 | ERR("error while receiving ust_marker list"); |
| 691 | return -1; |
| 692 | } |
| 693 | |
| 694 | tmp_tes = (struct ustctl_trace_event_status *) |
| 695 | malloc(sizeof(struct ustctl_trace_event_status) * |
| 696 | (ustctl_count_nl(big_str) + 1)); |
| 697 | if (tmp_tes == NULL) { |
| 698 | ERR("Failed to allocate TES array"); |
| 699 | return -1; |
| 700 | } |
| 701 | |
| 702 | /* Parse received reply string (format: "[name]"): */ |
| 703 | while (big_str[i] != '\0') { |
| 704 | sscanf(big_str + i, "trace_event: %a[^\n]", &tmp_tes[tes_ind].name); |
| 705 | while (big_str[i] != '\n') { |
| 706 | ++i; /* Go to next '\n' */ |
| 707 | } |
| 708 | ++i; /* Skip current pointed '\n' */ |
| 709 | ++tes_ind; |
| 710 | } |
| 711 | tmp_tes[tes_ind].name = NULL; |
| 712 | |
| 713 | *tes = tmp_tes; |
| 714 | |
| 715 | free(big_str); |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * Set sock path |
| 721 | * |
| 722 | * @param sock_path Sock path |
| 723 | * @param pid Traced process ID |
| 724 | * @return 0 if successful, or error |
| 725 | */ |
| 726 | int ustctl_set_sock_path(int sock, const char *sock_path) |
| 727 | { |
| 728 | int result; |
| 729 | struct ustcomm_header req_header, res_header; |
| 730 | struct ustcomm_single_field sock_path_msg; |
| 731 | |
| 732 | result = ustcomm_pack_single_field(&req_header, &sock_path_msg, sock_path); |
| 733 | if (result < 0) { |
| 734 | errno = -result; |
| 735 | return -1; |
| 736 | } |
| 737 | |
| 738 | req_header.command = SET_SOCK_PATH; |
| 739 | |
| 740 | return do_cmd(sock, &req_header, (char *)&sock_path_msg, &res_header, NULL); |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Get sock path |
| 745 | * |
| 746 | * @param sock_path Pointer to where the sock path will be returned |
| 747 | * @param pid Traced process ID |
| 748 | * @return 0 if successful, or error |
| 749 | */ |
| 750 | int ustctl_get_sock_path(int sock, char **sock_path) |
| 751 | { |
| 752 | int result; |
| 753 | struct ustcomm_header req_header, res_header; |
| 754 | struct ustcomm_single_field *sock_path_msg; |
| 755 | |
| 756 | req_header.command = GET_SOCK_PATH; |
| 757 | req_header.size = 0; |
| 758 | |
| 759 | result = do_cmd(sock, &req_header, NULL, &res_header, |
| 760 | (char **)&sock_path_msg); |
| 761 | if (result < 0) { |
| 762 | return -1; |
| 763 | } |
| 764 | |
| 765 | result = ustcomm_unpack_single_field(sock_path_msg); |
| 766 | if (result < 0) { |
| 767 | return result; |
| 768 | } |
| 769 | |
| 770 | *sock_path = strdup(sock_path_msg->field); |
| 771 | |
| 772 | free(sock_path_msg); |
| 773 | |
| 774 | return 0; |
| 775 | } |