| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #define _LGPL_SOURCE |
| 21 | #include <errno.h> |
| 22 | #include <limits.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <sys/wait.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <unistd.h> |
| 30 | #include <fcntl.h> |
| 31 | #include <sched.h> |
| 32 | #include <sys/signal.h> |
| 33 | #include <assert.h> |
| 34 | |
| 35 | #include <common/common.h> |
| 36 | #include <common/utils.h> |
| 37 | #include <common/compat/getenv.h> |
| 38 | #include <common/sessiond-comm/unix.h> |
| 39 | |
| 40 | #include "runas.h" |
| 41 | |
| 42 | struct run_as_data; |
| 43 | typedef int (*run_as_fct)(struct run_as_data *data); |
| 44 | |
| 45 | struct run_as_mkdir_data { |
| 46 | char path[PATH_MAX]; |
| 47 | mode_t mode; |
| 48 | }; |
| 49 | |
| 50 | struct run_as_open_data { |
| 51 | char path[PATH_MAX]; |
| 52 | int flags; |
| 53 | mode_t mode; |
| 54 | }; |
| 55 | |
| 56 | struct run_as_unlink_data { |
| 57 | char path[PATH_MAX]; |
| 58 | }; |
| 59 | |
| 60 | struct run_as_rmdir_recursive_data { |
| 61 | char path[PATH_MAX]; |
| 62 | }; |
| 63 | |
| 64 | enum run_as_cmd { |
| 65 | RUN_AS_MKDIR, |
| 66 | RUN_AS_OPEN, |
| 67 | RUN_AS_UNLINK, |
| 68 | RUN_AS_RMDIR_RECURSIVE, |
| 69 | RUN_AS_MKDIR_RECURSIVE, |
| 70 | }; |
| 71 | |
| 72 | struct run_as_data { |
| 73 | enum run_as_cmd cmd; |
| 74 | union { |
| 75 | struct run_as_mkdir_data mkdir; |
| 76 | struct run_as_open_data open; |
| 77 | struct run_as_unlink_data unlink; |
| 78 | struct run_as_rmdir_recursive_data rmdir_recursive; |
| 79 | } u; |
| 80 | uid_t uid; |
| 81 | gid_t gid; |
| 82 | }; |
| 83 | |
| 84 | struct run_as_ret { |
| 85 | int ret; |
| 86 | int _errno; |
| 87 | }; |
| 88 | |
| 89 | struct run_as_worker { |
| 90 | pid_t pid; /* Worker PID. */ |
| 91 | int sockpair[2]; |
| 92 | char *procname; |
| 93 | }; |
| 94 | |
| 95 | /* Single global worker per process (for now). */ |
| 96 | static struct run_as_worker *global_worker; |
| 97 | /* Lock protecting the worker. */ |
| 98 | static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER; |
| 99 | |
| 100 | #ifdef VALGRIND |
| 101 | static |
| 102 | int use_clone(void) |
| 103 | { |
| 104 | return 0; |
| 105 | } |
| 106 | #else |
| 107 | static |
| 108 | int use_clone(void) |
| 109 | { |
| 110 | return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE"); |
| 111 | } |
| 112 | #endif |
| 113 | |
| 114 | LTTNG_HIDDEN |
| 115 | int _utils_mkdir_recursive_unsafe(const char *path, mode_t mode); |
| 116 | |
| 117 | /* |
| 118 | * Create recursively directory using the FULL path. |
| 119 | */ |
| 120 | static |
| 121 | int _mkdir_recursive(struct run_as_data *data) |
| 122 | { |
| 123 | const char *path; |
| 124 | mode_t mode; |
| 125 | |
| 126 | path = data->u.mkdir.path; |
| 127 | mode = data->u.mkdir.mode; |
| 128 | |
| 129 | /* Safe to call as we have transitioned to the requested uid/gid. */ |
| 130 | return _utils_mkdir_recursive_unsafe(path, mode); |
| 131 | } |
| 132 | |
| 133 | static |
| 134 | int _mkdir(struct run_as_data *data) |
| 135 | { |
| 136 | return mkdir(data->u.mkdir.path, data->u.mkdir.mode); |
| 137 | } |
| 138 | |
| 139 | static |
| 140 | int _open(struct run_as_data *data) |
| 141 | { |
| 142 | return open(data->u.open.path, data->u.open.flags, data->u.open.mode); |
| 143 | } |
| 144 | |
| 145 | static |
| 146 | int _unlink(struct run_as_data *data) |
| 147 | { |
| 148 | return unlink(data->u.unlink.path); |
| 149 | } |
| 150 | |
| 151 | static |
| 152 | int _rmdir_recursive(struct run_as_data *data) |
| 153 | { |
| 154 | return utils_recursive_rmdir(data->u.rmdir_recursive.path); |
| 155 | } |
| 156 | |
| 157 | static |
| 158 | run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd) |
| 159 | { |
| 160 | switch (cmd) { |
| 161 | case RUN_AS_MKDIR: |
| 162 | return _mkdir; |
| 163 | case RUN_AS_OPEN: |
| 164 | return _open; |
| 165 | case RUN_AS_UNLINK: |
| 166 | return _unlink; |
| 167 | case RUN_AS_RMDIR_RECURSIVE: |
| 168 | return _rmdir_recursive; |
| 169 | case RUN_AS_MKDIR_RECURSIVE: |
| 170 | return _mkdir_recursive; |
| 171 | default: |
| 172 | ERR("Unknown command %d", (int) cmd) |
| 173 | return NULL; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | static |
| 178 | int do_send_fd(struct run_as_worker *worker, |
| 179 | enum run_as_cmd cmd, int fd) |
| 180 | { |
| 181 | ssize_t len; |
| 182 | |
| 183 | switch (cmd) { |
| 184 | case RUN_AS_OPEN: |
| 185 | break; |
| 186 | default: |
| 187 | return 0; |
| 188 | } |
| 189 | if (fd < 0) { |
| 190 | return 0; |
| 191 | } |
| 192 | len = lttcomm_send_fds_unix_sock(worker->sockpair[1], &fd, 1); |
| 193 | if (len < 0) { |
| 194 | PERROR("lttcomm_send_fds_unix_sock"); |
| 195 | return -1; |
| 196 | } |
| 197 | if (close(fd) < 0) { |
| 198 | PERROR("close"); |
| 199 | return -1; |
| 200 | } |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | static |
| 205 | int do_recv_fd(struct run_as_worker *worker, |
| 206 | enum run_as_cmd cmd, int *fd) |
| 207 | { |
| 208 | ssize_t len; |
| 209 | |
| 210 | switch (cmd) { |
| 211 | case RUN_AS_OPEN: |
| 212 | break; |
| 213 | default: |
| 214 | return 0; |
| 215 | } |
| 216 | if (*fd < 0) { |
| 217 | return 0; |
| 218 | } |
| 219 | len = lttcomm_recv_fds_unix_sock(worker->sockpair[0], fd, 1); |
| 220 | if (!len) { |
| 221 | return -1; |
| 222 | } else if (len < 0) { |
| 223 | PERROR("lttcomm_recv_fds_unix_sock"); |
| 224 | return -1; |
| 225 | } |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * Return < 0 on error, 0 if OK, 1 on hangup. |
| 231 | */ |
| 232 | static |
| 233 | int handle_one_cmd(struct run_as_worker *worker) |
| 234 | { |
| 235 | int ret = 0; |
| 236 | struct run_as_data data; |
| 237 | ssize_t readlen, writelen; |
| 238 | struct run_as_ret sendret; |
| 239 | run_as_fct cmd; |
| 240 | uid_t prev_euid; |
| 241 | |
| 242 | /* Read data */ |
| 243 | readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data, |
| 244 | sizeof(data)); |
| 245 | if (readlen == 0) { |
| 246 | /* hang up */ |
| 247 | ret = 1; |
| 248 | goto end; |
| 249 | } |
| 250 | if (readlen < sizeof(data)) { |
| 251 | PERROR("lttcomm_recv_unix_sock error"); |
| 252 | ret = -1; |
| 253 | goto end; |
| 254 | } |
| 255 | |
| 256 | cmd = run_as_enum_to_fct(data.cmd); |
| 257 | if (!cmd) { |
| 258 | ret = -1; |
| 259 | goto end; |
| 260 | } |
| 261 | |
| 262 | prev_euid = getuid(); |
| 263 | if (data.gid != getegid()) { |
| 264 | ret = setegid(data.gid); |
| 265 | if (ret < 0) { |
| 266 | PERROR("setegid"); |
| 267 | goto write_return; |
| 268 | } |
| 269 | } |
| 270 | if (data.uid != prev_euid) { |
| 271 | ret = seteuid(data.uid); |
| 272 | if (ret < 0) { |
| 273 | PERROR("seteuid"); |
| 274 | goto write_return; |
| 275 | } |
| 276 | } |
| 277 | /* |
| 278 | * Also set umask to 0 for mkdir executable bit. |
| 279 | */ |
| 280 | umask(0); |
| 281 | ret = (*cmd)(&data); |
| 282 | |
| 283 | write_return: |
| 284 | sendret.ret = ret; |
| 285 | sendret._errno = errno; |
| 286 | /* send back return value */ |
| 287 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
| 288 | sizeof(sendret)); |
| 289 | if (writelen < sizeof(sendret)) { |
| 290 | PERROR("lttcomm_send_unix_sock error"); |
| 291 | ret = -1; |
| 292 | goto end; |
| 293 | } |
| 294 | ret = do_send_fd(worker, data.cmd, ret); |
| 295 | if (ret) { |
| 296 | PERROR("do_send_fd error"); |
| 297 | ret = -1; |
| 298 | goto end; |
| 299 | } |
| 300 | if (seteuid(prev_euid) < 0) { |
| 301 | PERROR("seteuid"); |
| 302 | ret = -1; |
| 303 | goto end; |
| 304 | } |
| 305 | ret = 0; |
| 306 | end: |
| 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | static |
| 311 | int run_as_worker(struct run_as_worker *worker) |
| 312 | { |
| 313 | int ret; |
| 314 | ssize_t writelen; |
| 315 | struct run_as_ret sendret; |
| 316 | size_t proc_orig_len; |
| 317 | |
| 318 | /* |
| 319 | * Initialize worker. Set a different process cmdline. |
| 320 | */ |
| 321 | proc_orig_len = strlen(worker->procname); |
| 322 | memset(worker->procname, 0, proc_orig_len); |
| 323 | strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len); |
| 324 | |
| 325 | ret = pthread_setname_np(pthread_self(), DEFAULT_RUN_AS_WORKER_NAME); |
| 326 | if (ret) { |
| 327 | errno = ret; |
| 328 | ret = -1; |
| 329 | PERROR("pthread_setname_np"); |
| 330 | return EXIT_FAILURE; |
| 331 | } |
| 332 | |
| 333 | sendret.ret = 0; |
| 334 | sendret._errno = 0; |
| 335 | writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret, |
| 336 | sizeof(sendret)); |
| 337 | if (writelen < sizeof(sendret)) { |
| 338 | PERROR("lttcomm_send_unix_sock error"); |
| 339 | ret = EXIT_FAILURE; |
| 340 | goto end; |
| 341 | } |
| 342 | |
| 343 | for (;;) { |
| 344 | ret = handle_one_cmd(worker); |
| 345 | if (ret < 0) { |
| 346 | ret = EXIT_FAILURE; |
| 347 | goto end; |
| 348 | } else if (ret > 0) { |
| 349 | break; |
| 350 | } else { |
| 351 | continue; /* Next command. */ |
| 352 | } |
| 353 | } |
| 354 | ret = EXIT_SUCCESS; |
| 355 | end: |
| 356 | return ret; |
| 357 | } |
| 358 | |
| 359 | static |
| 360 | int run_as_cmd(struct run_as_worker *worker, |
| 361 | enum run_as_cmd cmd, |
| 362 | struct run_as_data *data, |
| 363 | uid_t uid, gid_t gid) |
| 364 | { |
| 365 | ssize_t readlen, writelen; |
| 366 | struct run_as_ret recvret; |
| 367 | |
| 368 | /* |
| 369 | * If we are non-root, we can only deal with our own uid. |
| 370 | */ |
| 371 | if (geteuid() != 0) { |
| 372 | if (uid != geteuid()) { |
| 373 | recvret.ret = -1; |
| 374 | recvret._errno = EPERM; |
| 375 | ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)", |
| 376 | uid, geteuid()); |
| 377 | goto end; |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | data->cmd = cmd; |
| 382 | data->uid = uid; |
| 383 | data->gid = gid; |
| 384 | |
| 385 | writelen = lttcomm_send_unix_sock(worker->sockpair[0], data, |
| 386 | sizeof(*data)); |
| 387 | if (writelen < sizeof(*data)) { |
| 388 | PERROR("Error writing message to run_as"); |
| 389 | recvret.ret = -1; |
| 390 | recvret._errno = errno; |
| 391 | goto end; |
| 392 | } |
| 393 | |
| 394 | /* receive return value */ |
| 395 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], &recvret, |
| 396 | sizeof(recvret)); |
| 397 | if (!readlen) { |
| 398 | ERR("Run-as worker has hung-up during run_as_cmd"); |
| 399 | recvret.ret = -1; |
| 400 | recvret._errno = EIO; |
| 401 | goto end; |
| 402 | } else if (readlen < sizeof(recvret)) { |
| 403 | PERROR("Error reading response from run_as"); |
| 404 | recvret.ret = -1; |
| 405 | recvret._errno = errno; |
| 406 | } |
| 407 | if (do_recv_fd(worker, cmd, &recvret.ret)) { |
| 408 | recvret.ret = -1; |
| 409 | recvret._errno = EIO; |
| 410 | } |
| 411 | |
| 412 | end: |
| 413 | errno = recvret._errno; |
| 414 | return recvret.ret; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | * This is for debugging ONLY and should not be considered secure. |
| 419 | */ |
| 420 | static |
| 421 | int run_as_noworker(enum run_as_cmd cmd, |
| 422 | struct run_as_data *data, uid_t uid, gid_t gid) |
| 423 | { |
| 424 | int ret, saved_errno; |
| 425 | mode_t old_mask; |
| 426 | run_as_fct fct; |
| 427 | |
| 428 | fct = run_as_enum_to_fct(cmd); |
| 429 | if (!fct) { |
| 430 | errno = -ENOSYS; |
| 431 | ret = -1; |
| 432 | goto end; |
| 433 | } |
| 434 | old_mask = umask(0); |
| 435 | ret = fct(data); |
| 436 | saved_errno = errno; |
| 437 | umask(old_mask); |
| 438 | errno = saved_errno; |
| 439 | end: |
| 440 | return ret; |
| 441 | } |
| 442 | |
| 443 | static |
| 444 | int run_as(enum run_as_cmd cmd, struct run_as_data *data, uid_t uid, gid_t gid) |
| 445 | { |
| 446 | int ret; |
| 447 | |
| 448 | if (use_clone()) { |
| 449 | DBG("Using run_as worker"); |
| 450 | pthread_mutex_lock(&worker_lock); |
| 451 | assert(global_worker); |
| 452 | ret = run_as_cmd(global_worker, cmd, data, uid, gid); |
| 453 | pthread_mutex_unlock(&worker_lock); |
| 454 | |
| 455 | } else { |
| 456 | DBG("Using run_as without worker"); |
| 457 | ret = run_as_noworker(cmd, data, uid, gid); |
| 458 | } |
| 459 | return ret; |
| 460 | } |
| 461 | |
| 462 | LTTNG_HIDDEN |
| 463 | int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 464 | { |
| 465 | struct run_as_data data; |
| 466 | |
| 467 | DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d", |
| 468 | path, mode, uid, gid); |
| 469 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
| 470 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; |
| 471 | data.u.mkdir.mode = mode; |
| 472 | return run_as(RUN_AS_MKDIR_RECURSIVE, &data, uid, gid); |
| 473 | } |
| 474 | |
| 475 | LTTNG_HIDDEN |
| 476 | int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid) |
| 477 | { |
| 478 | struct run_as_data data; |
| 479 | |
| 480 | DBG3("mkdir() %s with mode %d for uid %d and gid %d", |
| 481 | path, mode, uid, gid); |
| 482 | strncpy(data.u.mkdir.path, path, PATH_MAX - 1); |
| 483 | data.u.mkdir.path[PATH_MAX - 1] = '\0'; |
| 484 | data.u.mkdir.mode = mode; |
| 485 | return run_as(RUN_AS_MKDIR, &data, uid, gid); |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Note: open_run_as is currently not working. We'd need to pass the fd |
| 490 | * opened in the child to the parent. |
| 491 | */ |
| 492 | LTTNG_HIDDEN |
| 493 | int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid) |
| 494 | { |
| 495 | struct run_as_data data; |
| 496 | |
| 497 | DBG3("open() %s with flags %X mode %d for uid %d and gid %d", |
| 498 | path, flags, mode, uid, gid); |
| 499 | strncpy(data.u.open.path, path, PATH_MAX - 1); |
| 500 | data.u.open.path[PATH_MAX - 1] = '\0'; |
| 501 | data.u.open.flags = flags; |
| 502 | data.u.open.mode = mode; |
| 503 | return run_as(RUN_AS_OPEN, &data, uid, gid); |
| 504 | } |
| 505 | |
| 506 | LTTNG_HIDDEN |
| 507 | int run_as_unlink(const char *path, uid_t uid, gid_t gid) |
| 508 | { |
| 509 | struct run_as_data data; |
| 510 | |
| 511 | DBG3("unlink() %s with for uid %d and gid %d", |
| 512 | path, uid, gid); |
| 513 | strncpy(data.u.unlink.path, path, PATH_MAX - 1); |
| 514 | data.u.unlink.path[PATH_MAX - 1] = '\0'; |
| 515 | return run_as(RUN_AS_UNLINK, &data, uid, gid); |
| 516 | } |
| 517 | |
| 518 | LTTNG_HIDDEN |
| 519 | int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid) |
| 520 | { |
| 521 | struct run_as_data data; |
| 522 | |
| 523 | DBG3("rmdir_recursive() %s with for uid %d and gid %d", |
| 524 | path, uid, gid); |
| 525 | strncpy(data.u.rmdir_recursive.path, path, PATH_MAX - 1); |
| 526 | data.u.rmdir_recursive.path[PATH_MAX - 1] = '\0'; |
| 527 | return run_as(RUN_AS_RMDIR_RECURSIVE, &data, uid, gid); |
| 528 | } |
| 529 | |
| 530 | LTTNG_HIDDEN |
| 531 | int run_as_create_worker(char *procname) |
| 532 | { |
| 533 | pid_t pid; |
| 534 | int i, ret = 0; |
| 535 | ssize_t readlen; |
| 536 | struct run_as_ret recvret; |
| 537 | struct run_as_worker *worker; |
| 538 | |
| 539 | pthread_mutex_lock(&worker_lock); |
| 540 | assert(!global_worker); |
| 541 | if (!use_clone()) { |
| 542 | /* |
| 543 | * Don't initialize a worker, all run_as tasks will be performed |
| 544 | * in the current process. |
| 545 | */ |
| 546 | ret = 0; |
| 547 | goto end; |
| 548 | } |
| 549 | worker = zmalloc(sizeof(*worker)); |
| 550 | if (!worker) { |
| 551 | ret = -ENOMEM; |
| 552 | goto end; |
| 553 | } |
| 554 | worker->procname = procname; |
| 555 | /* Create unix socket. */ |
| 556 | if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) { |
| 557 | ret = -1; |
| 558 | goto error_sock; |
| 559 | } |
| 560 | /* Fork worker. */ |
| 561 | pid = fork(); |
| 562 | if (pid < 0) { |
| 563 | PERROR("fork"); |
| 564 | ret = -1; |
| 565 | goto error_fork; |
| 566 | } else if (pid == 0) { |
| 567 | /* Child */ |
| 568 | |
| 569 | /* The child has no use for this lock. */ |
| 570 | pthread_mutex_unlock(&worker_lock); |
| 571 | /* Just close, no shutdown. */ |
| 572 | if (close(worker->sockpair[0])) { |
| 573 | PERROR("close"); |
| 574 | exit(EXIT_FAILURE); |
| 575 | } |
| 576 | worker->sockpair[0] = -1; |
| 577 | ret = run_as_worker(worker); |
| 578 | if (lttcomm_close_unix_sock(worker->sockpair[1])) { |
| 579 | PERROR("close"); |
| 580 | ret = -1; |
| 581 | } |
| 582 | worker->sockpair[1] = -1; |
| 583 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); |
| 584 | } else { |
| 585 | /* Parent */ |
| 586 | |
| 587 | /* Just close, no shutdown. */ |
| 588 | if (close(worker->sockpair[1])) { |
| 589 | PERROR("close"); |
| 590 | ret = -1; |
| 591 | goto error_fork; |
| 592 | } |
| 593 | worker->sockpair[1] = -1; |
| 594 | worker->pid = pid; |
| 595 | /* Wait for worker to become ready. */ |
| 596 | readlen = lttcomm_recv_unix_sock(worker->sockpair[0], |
| 597 | &recvret, sizeof(recvret)); |
| 598 | if (readlen < sizeof(recvret)) { |
| 599 | ERR("readlen: %zd", readlen); |
| 600 | PERROR("Error reading response from run_as at creation"); |
| 601 | ret = -1; |
| 602 | goto error_fork; |
| 603 | } |
| 604 | global_worker = worker; |
| 605 | } |
| 606 | end: |
| 607 | pthread_mutex_unlock(&worker_lock); |
| 608 | return ret; |
| 609 | |
| 610 | /* Error handling. */ |
| 611 | error_fork: |
| 612 | for (i = 0; i < 2; i++) { |
| 613 | if (worker->sockpair[i] < 0) { |
| 614 | continue; |
| 615 | } |
| 616 | if (lttcomm_close_unix_sock(worker->sockpair[i])) { |
| 617 | PERROR("close"); |
| 618 | } |
| 619 | worker->sockpair[i] = -1; |
| 620 | } |
| 621 | error_sock: |
| 622 | free(worker); |
| 623 | pthread_mutex_unlock(&worker_lock); |
| 624 | return ret; |
| 625 | } |
| 626 | |
| 627 | LTTNG_HIDDEN |
| 628 | void run_as_destroy_worker(void) |
| 629 | { |
| 630 | struct run_as_worker *worker = global_worker; |
| 631 | int status; |
| 632 | pid_t pid; |
| 633 | |
| 634 | pthread_mutex_lock(&worker_lock); |
| 635 | if (!worker) { |
| 636 | goto end; |
| 637 | } |
| 638 | /* Close unix socket */ |
| 639 | if (lttcomm_close_unix_sock(worker->sockpair[0])) { |
| 640 | PERROR("close"); |
| 641 | } |
| 642 | worker->sockpair[0] = -1; |
| 643 | /* Wait for worker. */ |
| 644 | pid = waitpid(worker->pid, &status, 0); |
| 645 | if (pid < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
| 646 | PERROR("wait"); |
| 647 | } |
| 648 | free(worker); |
| 649 | global_worker = NULL; |
| 650 | end: |
| 651 | pthread_mutex_unlock(&worker_lock); |
| 652 | } |