| 1 | /* Copyright (C) 2009 Pierre-Marc Fournier, Philippe Proulx-Barrette |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public |
| 5 | * License as published by the Free Software Foundation; either |
| 6 | * version 2.1 of the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <unistd.h> |
| 21 | #include <getopt.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <fcntl.h> |
| 24 | #include <string.h> |
| 25 | #include <dirent.h> |
| 26 | |
| 27 | #include "ustcomm.h" |
| 28 | #include "ust/ustcmd.h" |
| 29 | #include "usterr.h" |
| 30 | |
| 31 | pid_t *ustcmd_get_online_pids(void) |
| 32 | { |
| 33 | struct dirent *dirent; |
| 34 | DIR *dir; |
| 35 | unsigned int ret_size = 1 * sizeof(pid_t), i = 0; |
| 36 | |
| 37 | dir = opendir(SOCK_DIR); |
| 38 | if (!dir) { |
| 39 | return NULL; |
| 40 | } |
| 41 | |
| 42 | pid_t *ret = (pid_t *) malloc(ret_size); |
| 43 | |
| 44 | while ((dirent = readdir(dir))) { |
| 45 | if (!strcmp(dirent->d_name, ".") || |
| 46 | !strcmp(dirent->d_name, "..")) { |
| 47 | |
| 48 | continue; |
| 49 | } |
| 50 | |
| 51 | if (dirent->d_type != DT_DIR && |
| 52 | !!strcmp(dirent->d_name, "ustd")) { |
| 53 | |
| 54 | sscanf(dirent->d_name, "%u", (unsigned int *) &ret[i]); |
| 55 | /* FIXME: Here we previously called pid_is_online, which |
| 56 | * always returned 1, now I replaced it with just 1. |
| 57 | * We need to figure out an intelligent way of solving |
| 58 | * this, maybe connect-disconnect. |
| 59 | */ |
| 60 | if (1) { |
| 61 | ret_size += sizeof(pid_t); |
| 62 | ret = (pid_t *) realloc(ret, ret_size); |
| 63 | ++i; |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | ret[i] = 0; /* Array end */ |
| 69 | |
| 70 | if (ret[0] == 0) { |
| 71 | /* No PID at all */ |
| 72 | free(ret); |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | closedir(dir); |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Sets marker state (USTCMD_MS_ON or USTCMD_MS_OFF). |
| 82 | * |
| 83 | * @param mn Marker name |
| 84 | * @param state Marker's new state |
| 85 | * @param pid Traced process ID |
| 86 | * @return 0 if successful, or errors {USTCMD_ERR_GEN, USTCMD_ERR_ARG} |
| 87 | */ |
| 88 | int ustcmd_set_marker_state(const char *mn, int state, pid_t pid) |
| 89 | { |
| 90 | char *cmd_str [] = {"disable_marker", "enable_marker"}; |
| 91 | char *cmd; |
| 92 | int result; |
| 93 | |
| 94 | if (mn == NULL) { |
| 95 | return USTCMD_ERR_ARG; |
| 96 | } |
| 97 | |
| 98 | if (asprintf(&cmd, "%s %s", cmd_str[state], mn) < 0) { |
| 99 | ERR("ustcmd_set_marker_state : asprintf failed (%s %s)", |
| 100 | cmd_str[state], mn); |
| 101 | return USTCMD_ERR_GEN; |
| 102 | } |
| 103 | |
| 104 | result = ustcmd_send_cmd(cmd, pid, NULL); |
| 105 | if (result != 1) { |
| 106 | free(cmd); |
| 107 | return USTCMD_ERR_GEN; |
| 108 | } |
| 109 | |
| 110 | free(cmd); |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Set subbuffer size. |
| 116 | * |
| 117 | * @param channel_size Channel name and size |
| 118 | * @param pid Traced process ID |
| 119 | * @return 0 if successful, or error |
| 120 | */ |
| 121 | int ustcmd_set_subbuf_size(const char *channel_size, pid_t pid) |
| 122 | { |
| 123 | char *cmd; |
| 124 | int result; |
| 125 | |
| 126 | if (asprintf(&cmd, "%s %s", "set_subbuf_size", channel_size) < 0) { |
| 127 | ERR("ustcmd_set_subbuf_size : asprintf failed (set_subbuf_size %s)", |
| 128 | channel_size); |
| 129 | return -1; |
| 130 | } |
| 131 | |
| 132 | result = ustcmd_send_cmd(cmd, pid, NULL); |
| 133 | if (result != 1) { |
| 134 | free(cmd); |
| 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | free(cmd); |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Set subbuffer num. |
| 144 | * |
| 145 | * @param channel_num Channel name and num |
| 146 | * @param pid Traced process ID |
| 147 | * @return 0 if successful, or error |
| 148 | */ |
| 149 | int ustcmd_set_subbuf_num(const char *channel_size, pid_t pid) |
| 150 | { |
| 151 | char *cmd; |
| 152 | int result; |
| 153 | |
| 154 | if (asprintf(&cmd, "%s %s", "set_subbuf_num", channel_size) < 0) { |
| 155 | ERR("ustcmd_set_subbuf_num : asprintf failed (set_subbuf_num %s", |
| 156 | channel_size); |
| 157 | return -1; |
| 158 | } |
| 159 | |
| 160 | result = ustcmd_send_cmd(cmd, pid, NULL); |
| 161 | if (result != 1) { |
| 162 | free(cmd); |
| 163 | return 1; |
| 164 | } |
| 165 | |
| 166 | free(cmd); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Get subbuffer size. |
| 172 | * |
| 173 | * @param channel Channel name |
| 174 | * @param pid Traced process ID |
| 175 | * @return subbuf size if successful, or error |
| 176 | */ |
| 177 | int ustcmd_get_subbuf_size(const char *channel, pid_t pid) |
| 178 | { |
| 179 | char *cmd, *reply; |
| 180 | int result; |
| 181 | |
| 182 | /* format: channel_cpu */ |
| 183 | if (asprintf(&cmd, "%s %s_0", "get_subbuf_size", channel) < 0) { |
| 184 | ERR("ustcmd_get_subbuf_size : asprintf failed (get_subbuf_size, %s_0", |
| 185 | channel); |
| 186 | return -1; |
| 187 | } |
| 188 | |
| 189 | result = ustcmd_send_cmd(cmd, pid, &reply); |
| 190 | if (result != 1) { |
| 191 | free(cmd); |
| 192 | return -1; |
| 193 | } |
| 194 | |
| 195 | result = atoi(reply); |
| 196 | free(cmd); |
| 197 | free(reply); |
| 198 | return result; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Get subbuffer num. |
| 203 | * |
| 204 | * @param channel Channel name |
| 205 | * @param pid Traced process ID |
| 206 | * @return subbuf cnf if successful, or error |
| 207 | */ |
| 208 | int ustcmd_get_subbuf_num(const char *channel, pid_t pid) |
| 209 | { |
| 210 | char *cmd, *reply; |
| 211 | int result; |
| 212 | |
| 213 | /* format: channel_cpu */ |
| 214 | if (asprintf(&cmd, "%s %s_0", "get_n_subbufs", channel) < 0) { |
| 215 | ERR("ustcmd_get_subbuf_num : asprintf failed (get_n_subbufs, %s_0", |
| 216 | channel); |
| 217 | return -1; |
| 218 | } |
| 219 | |
| 220 | result = ustcmd_send_cmd(cmd, pid, &reply); |
| 221 | if (result != 1) { |
| 222 | free(cmd); |
| 223 | return -1; |
| 224 | } |
| 225 | |
| 226 | result = atoi(reply); |
| 227 | free(cmd); |
| 228 | free(reply); |
| 229 | return result; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Destroys an UST trace according to a PID. |
| 234 | * |
| 235 | * @param pid Traced process ID |
| 236 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 237 | */ |
| 238 | int ustcmd_destroy_trace(pid_t pid) |
| 239 | { |
| 240 | int result; |
| 241 | |
| 242 | result = ustcmd_send_cmd("trace_destroy", pid, NULL); |
| 243 | if (result != 1) { |
| 244 | return USTCMD_ERR_GEN; |
| 245 | } |
| 246 | |
| 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * Starts an UST trace (and setups it) according to a PID. |
| 252 | * |
| 253 | * @param pid Traced process ID |
| 254 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 255 | */ |
| 256 | int ustcmd_setup_and_start(pid_t pid) |
| 257 | { |
| 258 | int result; |
| 259 | |
| 260 | result = ustcmd_send_cmd("start", pid, NULL); |
| 261 | if (result != 1) { |
| 262 | return USTCMD_ERR_GEN; |
| 263 | } |
| 264 | |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * Creates an UST trace according to a PID. |
| 270 | * |
| 271 | * @param pid Traced process ID |
| 272 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 273 | */ |
| 274 | int ustcmd_create_trace(pid_t pid) |
| 275 | { |
| 276 | int result; |
| 277 | |
| 278 | result = ustcmd_send_cmd("trace_create", pid, NULL); |
| 279 | if (result != 1) { |
| 280 | return USTCMD_ERR_GEN; |
| 281 | } |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Starts an UST trace according to a PID. |
| 288 | * |
| 289 | * @param pid Traced process ID |
| 290 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 291 | */ |
| 292 | int ustcmd_start_trace(pid_t pid) |
| 293 | { |
| 294 | int result; |
| 295 | |
| 296 | result = ustcmd_send_cmd("trace_start", pid, NULL); |
| 297 | if (result != 1) { |
| 298 | return USTCMD_ERR_GEN; |
| 299 | } |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Alloc an UST trace according to a PID. |
| 306 | * |
| 307 | * @param pid Traced process ID |
| 308 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 309 | */ |
| 310 | int ustcmd_alloc_trace(pid_t pid) |
| 311 | { |
| 312 | int result; |
| 313 | |
| 314 | result = ustcmd_send_cmd("trace_alloc", pid, NULL); |
| 315 | if (result != 1) { |
| 316 | return USTCMD_ERR_GEN; |
| 317 | } |
| 318 | |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * Stops an UST trace according to a PID. |
| 324 | * |
| 325 | * @param pid Traced process ID |
| 326 | * @return 0 if successful, or error USTCMD_ERR_GEN |
| 327 | */ |
| 328 | int ustcmd_stop_trace(pid_t pid) |
| 329 | { |
| 330 | int result; |
| 331 | |
| 332 | result = ustcmd_send_cmd("trace_stop", pid, NULL); |
| 333 | if (result != 1) { |
| 334 | return USTCMD_ERR_GEN; |
| 335 | } |
| 336 | |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | /** |
| 341 | * Counts newlines ('\n') in a string. |
| 342 | * |
| 343 | * @param str String to search in |
| 344 | * @return Total newlines count |
| 345 | */ |
| 346 | unsigned int ustcmd_count_nl(const char *str) |
| 347 | { |
| 348 | unsigned int i = 0, tot = 0; |
| 349 | |
| 350 | while (str[i] != '\0') { |
| 351 | if (str[i] == '\n') { |
| 352 | ++tot; |
| 353 | } |
| 354 | ++i; |
| 355 | } |
| 356 | |
| 357 | return tot; |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * Frees a CMSF array. |
| 362 | * |
| 363 | * @param cmsf CMSF array to free |
| 364 | * @return 0 if successful, or error USTCMD_ERR_ARG |
| 365 | */ |
| 366 | int ustcmd_free_cmsf(struct marker_status *cmsf) |
| 367 | { |
| 368 | if (cmsf == NULL) { |
| 369 | return USTCMD_ERR_ARG; |
| 370 | } |
| 371 | |
| 372 | unsigned int i = 0; |
| 373 | while (cmsf[i].channel != NULL) { |
| 374 | free(cmsf[i].channel); |
| 375 | free(cmsf[i].marker); |
| 376 | free(cmsf[i].fs); |
| 377 | ++i; |
| 378 | } |
| 379 | free(cmsf); |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * Gets channel/marker/state/format string for a given PID. |
| 386 | * |
| 387 | * @param cmsf Pointer to CMSF array to be filled (callee allocates, caller |
| 388 | * frees with `ustcmd_free_cmsf') |
| 389 | * @param pid Targeted PID |
| 390 | * @return 0 if successful, or -1 on error |
| 391 | */ |
| 392 | int ustcmd_get_cmsf(struct marker_status **cmsf, const pid_t pid) |
| 393 | { |
| 394 | char *big_str = NULL; |
| 395 | int result; |
| 396 | struct marker_status *tmp_cmsf = NULL; |
| 397 | unsigned int i = 0, cmsf_ind = 0; |
| 398 | |
| 399 | if (cmsf == NULL) { |
| 400 | return -1; |
| 401 | } |
| 402 | result = ustcmd_send_cmd("list_markers", pid, &big_str); |
| 403 | if (result != 1) { |
| 404 | ERR("error while getting markers list"); |
| 405 | return -1; |
| 406 | } |
| 407 | |
| 408 | tmp_cmsf = (struct marker_status *) malloc(sizeof(struct marker_status) * |
| 409 | (ustcmd_count_nl(big_str) + 1)); |
| 410 | if (tmp_cmsf == NULL) { |
| 411 | ERR("Failed to allocate CMSF array"); |
| 412 | return -1; |
| 413 | } |
| 414 | |
| 415 | /* Parse received reply string (format: "[chan]/[mark] [st] [fs]"): */ |
| 416 | while (big_str[i] != '\0') { |
| 417 | char state; |
| 418 | |
| 419 | sscanf(big_str + i, "marker: %a[^/]/%a[^ ] %c %a[^\n]", |
| 420 | &tmp_cmsf[cmsf_ind].channel, |
| 421 | &tmp_cmsf[cmsf_ind].marker, |
| 422 | &state, |
| 423 | &tmp_cmsf[cmsf_ind].fs); |
| 424 | tmp_cmsf[cmsf_ind].state = (state == USTCMD_MS_CHR_ON ? |
| 425 | USTCMD_MS_ON : USTCMD_MS_OFF); /* Marker state */ |
| 426 | |
| 427 | while (big_str[i] != '\n') { |
| 428 | ++i; /* Go to next '\n' */ |
| 429 | } |
| 430 | ++i; /* Skip current pointed '\n' */ |
| 431 | ++cmsf_ind; |
| 432 | } |
| 433 | tmp_cmsf[cmsf_ind].channel = NULL; |
| 434 | tmp_cmsf[cmsf_ind].marker = NULL; |
| 435 | tmp_cmsf[cmsf_ind].fs = NULL; |
| 436 | |
| 437 | *cmsf = tmp_cmsf; |
| 438 | |
| 439 | free(big_str); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | |
| 444 | /** |
| 445 | * Frees a TES array. |
| 446 | * |
| 447 | * @param tes TES array to free |
| 448 | * @return 0 if successful, or error USTCMD_ERR_ARG |
| 449 | */ |
| 450 | int ustcmd_free_tes(struct trace_event_status *tes) |
| 451 | { |
| 452 | if (tes == NULL) { |
| 453 | return USTCMD_ERR_ARG; |
| 454 | } |
| 455 | |
| 456 | unsigned int i = 0; |
| 457 | while (tes[i].name != NULL) { |
| 458 | free(tes[i].name); |
| 459 | ++i; |
| 460 | } |
| 461 | free(tes); |
| 462 | |
| 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * Gets trace_events string for a given PID. |
| 468 | * |
| 469 | * @param tes Pointer to TES array to be filled (callee allocates, caller |
| 470 | * frees with `ustcmd_free_tes') |
| 471 | * @param pid Targeted PID |
| 472 | * @return 0 if successful, or -1 on error |
| 473 | */ |
| 474 | int ustcmd_get_tes(struct trace_event_status **tes, |
| 475 | const pid_t pid) |
| 476 | { |
| 477 | char *big_str = NULL; |
| 478 | int result; |
| 479 | struct trace_event_status *tmp_tes = NULL; |
| 480 | unsigned int i = 0, tes_ind = 0; |
| 481 | |
| 482 | if (tes == NULL) { |
| 483 | return -1; |
| 484 | } |
| 485 | |
| 486 | result = ustcmd_send_cmd("list_trace_events", pid, &big_str); |
| 487 | if (result != 1) { |
| 488 | ERR("error while getting trace_event list"); |
| 489 | return -1; |
| 490 | } |
| 491 | |
| 492 | tmp_tes = (struct trace_event_status *) |
| 493 | zmalloc(sizeof(struct trace_event_status) * |
| 494 | (ustcmd_count_nl(big_str) + 1)); |
| 495 | if (tmp_tes == NULL) { |
| 496 | ERR("Failed to allocate TES array"); |
| 497 | return -1; |
| 498 | } |
| 499 | |
| 500 | /* Parse received reply string (format: "[name]"): */ |
| 501 | while (big_str[i] != '\0') { |
| 502 | char state; |
| 503 | |
| 504 | sscanf(big_str + i, "trace_event: %a[^\n]", |
| 505 | &tmp_tes[tes_ind].name); |
| 506 | while (big_str[i] != '\n') { |
| 507 | ++i; /* Go to next '\n' */ |
| 508 | } |
| 509 | ++i; /* Skip current pointed '\n' */ |
| 510 | ++tes_ind; |
| 511 | } |
| 512 | tmp_tes[tes_ind].name = NULL; |
| 513 | |
| 514 | *tes = tmp_tes; |
| 515 | |
| 516 | free(big_str); |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | /** |
| 521 | * Set socket path |
| 522 | * |
| 523 | * @param sock_path Socket path |
| 524 | * @param pid Traced process ID |
| 525 | * @return 0 if successful, or error |
| 526 | */ |
| 527 | int ustcmd_set_sock_path(const char *sock_path, pid_t pid) |
| 528 | { |
| 529 | char *cmd; |
| 530 | int result; |
| 531 | |
| 532 | if (asprintf(&cmd, "%s %s", "set_sock_path", sock_path) < 0) { |
| 533 | ERR("ustcmd_set_sock_path : asprintf failed (set_sock_path, %s", |
| 534 | sock_path); |
| 535 | return -1; |
| 536 | } |
| 537 | |
| 538 | result = ustcmd_send_cmd(cmd, pid, NULL); |
| 539 | if (result != 1) { |
| 540 | free(cmd); |
| 541 | return USTCMD_ERR_GEN; |
| 542 | } |
| 543 | |
| 544 | free(cmd); |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * Get socket path |
| 550 | * |
| 551 | * @param sock_path Pointer to where the socket path will be returned |
| 552 | * @param pid Traced process ID |
| 553 | * @return 0 if successful, or error |
| 554 | */ |
| 555 | int ustcmd_get_sock_path(char **sock_path, pid_t pid) |
| 556 | { |
| 557 | char *cmd, *reply; |
| 558 | int result; |
| 559 | |
| 560 | if (asprintf(&cmd, "%s", "get_sock_path") < 0) { |
| 561 | ERR("ustcmd_get_sock_path : asprintf failed"); |
| 562 | return USTCMD_ERR_GEN; |
| 563 | } |
| 564 | |
| 565 | result = ustcmd_send_cmd(cmd, pid, &reply); |
| 566 | if (result != 1) { |
| 567 | free(cmd); |
| 568 | return USTCMD_ERR_GEN; |
| 569 | } |
| 570 | |
| 571 | free(cmd); |
| 572 | *sock_path = reply; |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | int ustcmd_force_switch(pid_t pid) |
| 577 | { |
| 578 | int result; |
| 579 | |
| 580 | result = ustcmd_send_cmd("force_switch", pid, NULL); |
| 581 | if (result != 1) { |
| 582 | return USTCMD_ERR_GEN; |
| 583 | } |
| 584 | |
| 585 | return 0; |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * Sends a given command to a traceable process |
| 590 | * |
| 591 | * @param cmd Null-terminated command to send |
| 592 | * @param pid Targeted PID |
| 593 | * @param reply Pointer to string to be filled with a reply string (must |
| 594 | * be NULL if no reply is needed for the given command). |
| 595 | * @return -1 if not successful, 0 on EOT, 1 on success |
| 596 | */ |
| 597 | |
| 598 | int ustcmd_send_cmd(const char *cmd, const pid_t pid, char **reply) |
| 599 | { |
| 600 | int app_fd; |
| 601 | int retval; |
| 602 | |
| 603 | if (ustcomm_connect_app(pid, &app_fd)) { |
| 604 | ERR("could not connect to PID %u", (unsigned int) pid); |
| 605 | return -1; |
| 606 | } |
| 607 | |
| 608 | retval = ustcomm_send_request(app_fd, cmd, reply); |
| 609 | |
| 610 | close(app_fd); |
| 611 | |
| 612 | return retval; |
| 613 | } |