udev/udevd.c

   1 /*
   2  * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
   4  * Copyright (C) 2009 Canonical Ltd.
   5  * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program 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
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stddef.h>
  22 #include <signal.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <stdbool.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <fcntl.h>
  31 #include <time.h>
  32 #include <getopt.h>
  33 #include <dirent.h>
  34 #include <sys/time.h>
  35 #include <sys/prctl.h>
  36 #include <sys/socket.h>
  37 #include <sys/un.h>
  38 #include <sys/signalfd.h>
  39 #include <sys/select.h>
  40 #include <sys/poll.h>
  41 #include <sys/wait.h>
  42 #include <sys/stat.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/inotify.h>
  45 #include <sys/utsname.h>
  46
  47 #include "udev.h"
  48 #include "sd-daemon.h"
  49
  50 #define UDEVD_PRIORITY                  -4
  51 #define UDEV_PRIORITY                   -2
  52
  53 static bool debug;
  54
  55 static void log_fn(struct udev *udev, int priority,
  56                    const char *file, int line, const char *fn,
  57                    const char *format, va_list args)
  58 {
  59         if (debug) {
  60                 char buf[1024];
  61                 struct timeval tv;
  62                 struct timezone tz;
  63
  64                 vsnprintf(buf, sizeof(buf), format, args);
  65                 gettimeofday(&tv, &tz);
  66                 fprintf(stderr, "%llu.%06u [%u] %s: %s",
  67                         (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
  68                         (int) getpid(), fn, buf);
  69         } else {
  70                 vsyslog(priority, format, args);
  71         }
  72 }
  73
  74 static struct udev_rules *rules;
  75 static struct udev_queue_export *udev_queue_export;
  76 static struct udev_ctrl *udev_ctrl;
  77 static struct udev_monitor *monitor;
  78 static int worker_watch[2];
  79 static pid_t settle_pid;
  80 static bool stop_exec_queue;
  81 static bool reload_config;
  82 static int children;
  83 static int children_max;
  84 static int exec_delay;
  85 static sigset_t orig_sigmask;
  86 static struct udev_list_node event_list;
  87 static struct udev_list_node worker_list;
  88 static bool udev_exit;
  89 static volatile sig_atomic_t worker_exit;
  90
  91 enum poll_fd {
  92         FD_CONTROL,
  93         FD_NETLINK,
  94         FD_INOTIFY,
  95         FD_SIGNAL,
  96         FD_WORKER,
  97 };
  98
  99 static struct pollfd pfd[] = {
 100         [FD_NETLINK] = { .events = POLLIN },
 101         [FD_WORKER] =  { .events = POLLIN },
 102         [FD_SIGNAL] =  { .events = POLLIN },
 103         [FD_INOTIFY] = { .events = POLLIN },
 104         [FD_CONTROL] = { .events = POLLIN },
 105 };
 106
 107 enum event_state {
 108         EVENT_UNDEF,
 109         EVENT_QUEUED,
 110         EVENT_RUNNING,
 111 };
 112
 113 struct event {
 114         struct udev_list_node node;
 115         struct udev *udev;
 116         struct udev_device *dev;
 117         enum event_state state;
 118         int exitcode;
 119         unsigned long long int delaying_seqnum;
 120         unsigned long long int seqnum;
 121         const char *devpath;
 122         size_t devpath_len;
 123         const char *devpath_old;
 124         dev_t devnum;
 125         bool is_block;
 126 };
 127
 128 static struct event *node_to_event(struct udev_list_node *node)
 129 {
 130         char *event;
 131
 132         event = (char *)node;
 133         event -= offsetof(struct event, node);
 134         return (struct event *)event;
 135 }
 136
 137 enum worker_state {
 138         WORKER_UNDEF,
 139         WORKER_RUNNING,
 140         WORKER_IDLE,
 141         WORKER_KILLED,
 142 };
 143
 144 struct worker {
 145         struct udev_list_node node;
 146         struct udev *udev;
 147         int refcount;
 148         pid_t pid;
 149         struct udev_monitor *monitor;
 150         enum worker_state state;
 151         struct event *event;
 152 };
 153
 154 /* passed from worker to main process */
 155 struct worker_message {
 156         pid_t pid;
 157         int exitcode;
 158 };
 159
 160 static struct worker *node_to_worker(struct udev_list_node *node)
 161 {
 162         char *worker;
 163
 164         worker = (char *)node;
 165         worker -= offsetof(struct worker, node);
 166         return (struct worker *)worker;
 167 }
 168
 169 static void event_queue_delete(struct event *event)
 170 {
 171         udev_list_node_remove(&event->node);
 172
 173         /* mark as failed, if "add" event returns non-zero */
 174         if (event->exitcode != 0 && strcmp(udev_device_get_action(event->dev), "remove") != 0)
 175                 udev_queue_export_device_failed(udev_queue_export, event->dev);
 176         else
 177                 udev_queue_export_device_finished(udev_queue_export, event->dev);
 178
 179         info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
 180         udev_device_unref(event->dev);
 181         free(event);
 182 }
 183
 184 static void event_sig_handler(int signum)
 185 {
 186         switch (signum) {
 187         case SIGALRM:
 188                 _exit(1);
 189                 break;
 190         case SIGTERM:
 191                 worker_exit = true;
 192                 break;
 193         }
 194 }
 195
 196 static struct worker *worker_ref(struct worker *worker)
 197 {
 198         worker->refcount++;
 199         return worker;
 200 }
 201
 202 static void worker_unref(struct worker *worker)
 203 {
 204         worker->refcount--;
 205         if (worker->refcount > 0)
 206                 return;
 207
 208         udev_list_node_remove(&worker->node);
 209         udev_monitor_unref(worker->monitor);
 210         children--;
 211         info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
 212         free(worker);
 213 }
 214
 215 static void worker_new(struct event *event)
 216 {
 217         struct worker *worker;
 218         struct udev_monitor *worker_monitor;
 219         pid_t pid;
 220         struct sigaction act;
 221
 222         /* listen for new events */
 223         worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
 224         if (worker_monitor == NULL)
 225                 return;
 226         /* allow the main daemon netlink address to send devices to the worker */
 227         udev_monitor_allow_unicast_sender(worker_monitor, monitor);
 228         udev_monitor_enable_receiving(worker_monitor);
 229
 230         worker = calloc(1, sizeof(struct worker));
 231         if (worker == NULL) {
 232                 udev_monitor_unref(worker_monitor);
 233                 return;
 234         }
 235         /* worker + event reference */
 236         worker->refcount = 2;
 237         worker->udev = event->udev;
 238
 239         pid = fork();
 240         switch (pid) {
 241         case 0: {
 242                 sigset_t sigmask;
 243                 struct udev_device *dev;
 244                 struct pollfd pmon = {
 245                         .fd = udev_monitor_get_fd(worker_monitor),
 246                         .events = POLLIN,
 247                 };
 248
 249                 udev_queue_export_unref(udev_queue_export);
 250                 udev_monitor_unref(monitor);
 251                 udev_ctrl_unref(udev_ctrl);
 252                 close(pfd[FD_SIGNAL].fd);
 253                 close(worker_watch[READ_END]);
 254                 udev_log_close();
 255                 udev_log_init("udevd-work");
 256                 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
 257
 258                 /* set signal handlers */
 259                 memset(&act, 0x00, sizeof(act));
 260                 act.sa_handler = event_sig_handler;
 261                 sigemptyset (&act.sa_mask);
 262                 act.sa_flags = 0;
 263                 sigaction(SIGTERM, &act, NULL);
 264                 sigaction(SIGALRM, &act, NULL);
 265
 266                 /* unblock SIGALRM */
 267                 sigfillset(&sigmask);
 268                 sigdelset(&sigmask, SIGALRM);
 269                 sigprocmask(SIG_SETMASK, &sigmask, NULL);
 270                 /* SIGTERM is unblocked in ppoll() */
 271                 sigdelset(&sigmask, SIGTERM);
 272
 273                 /* request TERM signal if parent exits */
 274                 prctl(PR_SET_PDEATHSIG, SIGTERM);
 275
 276                 /* initial device */
 277                 dev = event->dev;
 278
 279                 do {
 280                         struct udev_event *udev_event;
 281                         struct worker_message msg = {};
 282                         int err;
 283                         int failed = 0;
 284
 285                         info(event->udev, "seq %llu running\n", udev_device_get_seqnum(dev));
 286                         udev_event = udev_event_new(dev);
 287                         if (udev_event == NULL)
 288                                 _exit(3);
 289
 290                         /* set timeout to prevent hanging processes */
 291                         alarm(UDEV_EVENT_TIMEOUT);
 292
 293                         if (exec_delay > 0)
 294                                 udev_event->exec_delay = exec_delay;
 295
 296                         /* apply rules, create node, symlinks */
 297                         err = udev_event_execute_rules(udev_event, rules);
 298
 299                         /* rules may change/disable the timeout */
 300                         if (udev_device_get_event_timeout(dev) >= 0)
 301                                 alarm(udev_device_get_event_timeout(dev));
 302
 303                         if (err == 0)
 304                                 failed = udev_event_execute_run(udev_event, &orig_sigmask);
 305
 306                         alarm(0);
 307
 308                         /* apply/restore inotify watch */
 309                         if (err == 0 && udev_event->inotify_watch) {
 310                                 udev_watch_begin(udev_event->udev, dev);
 311                                 udev_device_update_db(dev);
 312                         }
 313
 314                         /* send processed event back to libudev listeners */
 315                         udev_monitor_send_device(worker_monitor, NULL, dev);
 316
 317                         /* send udevd the result of the event execution */
 318                         if (err != 0)
 319                                 msg.exitcode = err;
 320                         else if (failed != 0)
 321                                 msg.exitcode = failed;
 322                         msg.pid = getpid();
 323                         send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
 324
 325                         info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
 326                         udev_event_unref(udev_event);
 327                         udev_device_unref(dev);
 328                         dev = NULL;
 329
 330                         /* wait for more device messages or signal from udevd */
 331                         while (!worker_exit) {
 332                                 int fdcount;
 333
 334                                 fdcount = ppoll(&pmon, 1, NULL, &sigmask);
 335                                 if (fdcount < 0)
 336                                         continue;
 337
 338                                 if (pmon.revents & POLLIN) {
 339                                         dev = udev_monitor_receive_device(worker_monitor);
 340                                         if (dev != NULL)
 341                                                 break;
 342                                 }
 343                         }
 344                 } while (dev != NULL);
 345
 346                 udev_monitor_unref(worker_monitor);
 347                 udev_log_close();
 348                 exit(0);
 349         }
 350         case -1:
 351                 udev_monitor_unref(worker_monitor);
 352                 event->state = EVENT_QUEUED;
 353                 free(worker);
 354                 err(event->udev, "fork of child failed: %m\n");
 355                 break;
 356         default:
 357                 /* close monitor, but keep address around */
 358                 udev_monitor_disconnect(worker_monitor);
 359                 worker->monitor = worker_monitor;
 360                 worker->pid = pid;
 361                 worker->state = WORKER_RUNNING;
 362                 worker->event = event;
 363                 event->state = EVENT_RUNNING;
 364                 udev_list_node_append(&worker->node, &worker_list);
 365                 children++;
 366                 info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
 367                 break;
 368         }
 369 }
 370
 371 static void event_run(struct event *event, bool force)
 372 {
 373         struct udev_list_node *loop;
 374
 375         udev_list_node_foreach(loop, &worker_list) {
 376                 struct worker *worker = node_to_worker(loop);
 377                 ssize_t count;
 378
 379                 if (worker->state != WORKER_IDLE)
 380                         continue;
 381
 382                 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
 383                 if (count < 0) {
 384                         err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
 385                         kill(worker->pid, SIGKILL);
 386                         worker->state = WORKER_KILLED;
 387                         continue;
 388                 }
 389                 worker_ref(worker);
 390                 worker->event = event;
 391                 worker->state = WORKER_RUNNING;
 392                 event->state = EVENT_RUNNING;
 393                 return;
 394         }
 395
 396         if (!force && children >= children_max) {
 397                 if (children_max > 1)
 398                         info(event->udev, "maximum number (%i) of children reached\n", children);
 399                 return;
 400         }
 401
 402         /* start new worker and pass initial device */
 403         worker_new(event);
 404 }
 405
 406 static int event_queue_insert(struct udev_device *dev)
 407 {
 408         struct event *event;
 409
 410         event = calloc(1, sizeof(struct event));
 411         if (event == NULL)
 412                 return -1;
 413
 414         event->udev = udev_device_get_udev(dev);
 415         event->dev = dev;
 416         event->seqnum = udev_device_get_seqnum(dev);
 417         event->devpath = udev_device_get_devpath(dev);
 418         event->devpath_len = strlen(event->devpath);
 419         event->devpath_old = udev_device_get_devpath_old(dev);
 420         event->devnum = udev_device_get_devnum(dev);
 421         event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
 422
 423         udev_queue_export_device_queued(udev_queue_export, dev);
 424         info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
 425              udev_device_get_action(dev), udev_device_get_subsystem(dev));
 426
 427         event->state = EVENT_QUEUED;
 428         udev_list_node_append(&event->node, &event_list);
 429
 430         /* run all events with a timeout set immediately */
 431         if (udev_device_get_timeout(dev) > 0) {
 432                 event_run(event, true);
 433                 return 0;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void worker_kill(struct udev *udev, int retain)
 440 {
 441         struct udev_list_node *loop;
 442         int max;
 443
 444         if (children <= retain)
 445                 return;
 446
 447         max = children - retain;
 448
 449         udev_list_node_foreach(loop, &worker_list) {
 450                 struct worker *worker = node_to_worker(loop);
 451
 452                 if (max-- <= 0)
 453                         break;
 454
 455                 if (worker->state == WORKER_KILLED)
 456                         continue;
 457
 458                 worker->state = WORKER_KILLED;
 459                 kill(worker->pid, SIGTERM);
 460         }
 461 }
 462
 463 /* lookup event for identical, parent, child device */
 464 static bool is_devpath_busy(struct event *event)
 465 {
 466         struct udev_list_node *loop;
 467         size_t common;
 468
 469         /* check if queue contains events we depend on */
 470         udev_list_node_foreach(loop, &event_list) {
 471                 struct event *loop_event = node_to_event(loop);
 472
 473                 /* we already found a later event, earlier can not block us, no need to check again */
 474                 if (loop_event->seqnum < event->delaying_seqnum)
 475                         continue;
 476
 477                 /* event we checked earlier still exists, no need to check again */
 478                 if (loop_event->seqnum == event->delaying_seqnum)
 479                         return true;
 480
 481                 /* found ourself, no later event can block us */
 482                 if (loop_event->seqnum >= event->seqnum)
 483                         break;
 484
 485                 /* check major/minor */
 486                 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
 487                         return true;
 488
 489                 /* check our old name */
 490                 if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
 491                         event->delaying_seqnum = loop_event->seqnum;
 492                         return true;
 493                 }
 494
 495                 /* compare devpath */
 496                 common = MIN(loop_event->devpath_len, event->devpath_len);
 497
 498                 /* one devpath is contained in the other? */
 499                 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
 500                         continue;
 501
 502                 /* identical device event found */
 503                 if (loop_event->devpath_len == event->devpath_len) {
 504                         event->delaying_seqnum = loop_event->seqnum;
 505                         return true;
 506                 }
 507
 508                 /* parent device event found */
 509                 if (event->devpath[common] == '/') {
 510                         event->delaying_seqnum = loop_event->seqnum;
 511                         return true;
 512                 }
 513
 514                 /* child device event found */
 515                 if (loop_event->devpath[common] == '/') {
 516                         event->delaying_seqnum = loop_event->seqnum;
 517                         return true;
 518                 }
 519
 520                 /* no matching device */
 521                 continue;
 522         }
 523
 524         return false;
 525 }
 526
 527 static void events_start(struct udev *udev)
 528 {
 529         struct udev_list_node *loop;
 530
 531         udev_list_node_foreach(loop, &event_list) {
 532                 struct event *event = node_to_event(loop);
 533
 534                 if (event->state != EVENT_QUEUED)
 535                         continue;
 536
 537                 /* do not start event if parent or child event is still running */
 538                 if (is_devpath_busy(event)) {
 539                         dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
 540                         continue;
 541                 }
 542
 543                 event_run(event, false);
 544         }
 545 }
 546
 547 static void worker_returned(void)
 548 {
 549         for (;;) {
 550                 struct worker_message msg;
 551                 ssize_t size;
 552                 struct udev_list_node *loop;
 553
 554                 size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
 555                 if (size != sizeof(struct worker_message))
 556                         break;
 557
 558                 /* lookup worker who sent the signal */
 559                 udev_list_node_foreach(loop, &worker_list) {
 560                         struct worker *worker = node_to_worker(loop);
 561
 562                         if (worker->pid != msg.pid)
 563                                 continue;
 564
 565                         /* worker returned */
 566                         worker->event->exitcode = msg.exitcode;
 567                         event_queue_delete(worker->event);
 568                         worker->event = NULL;
 569                         if (worker->state != WORKER_KILLED)
 570                                 worker->state = WORKER_IDLE;
 571                         worker_unref(worker);
 572                         break;
 573                 }
 574         }
 575 }
 576
 577 /* receive the udevd message from userspace */
 578 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
 579 {
 580         struct udev *udev = udev_ctrl_get_udev(uctrl);
 581         struct udev_ctrl_msg *ctrl_msg;
 582         const char *str;
 583         int i;
 584
 585         ctrl_msg = udev_ctrl_receive_msg(uctrl);
 586         if (ctrl_msg == NULL)
 587                 return;
 588
 589         i = udev_ctrl_get_set_log_level(ctrl_msg);
 590         if (i >= 0) {
 591                 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
 592                 udev_set_log_priority(udev, i);
 593                 worker_kill(udev, 0);
 594         }
 595
 596         if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
 597                 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
 598                 stop_exec_queue = true;
 599         }
 600
 601         if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
 602                 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
 603                 stop_exec_queue = false;
 604         }
 605
 606         if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
 607                 info(udev, "udevd message (RELOAD_RULES) received\n");
 608                 reload_config = true;
 609         }
 610
 611         str = udev_ctrl_get_set_env(ctrl_msg);
 612         if (str != NULL) {
 613                 char *key;
 614
 615                 key = strdup(str);
 616                 if (key != NULL) {
 617                         char *val;
 618
 619                         val = strchr(key, '=');
 620                         if (val != NULL) {
 621                                 val[0] = '\0';
 622                                 val = &val[1];
 623                                 if (val[0] == '\0') {
 624                                         info(udev, "udevd message (ENV) received, unset '%s'\n", key);
 625                                         udev_add_property(udev, key, NULL);
 626                                 } else {
 627                                         info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
 628                                         udev_add_property(udev, key, val);
 629                                 }
 630                         } else {
 631                                 err(udev, "wrong key format '%s'\n", key);
 632                         }
 633                         free(key);
 634                 }
 635                 worker_kill(udev, 0);
 636         }
 637
 638         i = udev_ctrl_get_set_children_max(ctrl_msg);
 639         if (i >= 0) {
 640                 info(udev, "udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
 641                 children_max = i;
 642         }
 643
 644         settle_pid = udev_ctrl_get_settle(ctrl_msg);
 645         if (settle_pid > 0) {
 646                 info(udev, "udevd message (SETTLE) received\n");
 647                 kill(settle_pid, SIGUSR1);
 648                 settle_pid = 0;
 649         }
 650         udev_ctrl_msg_unref(ctrl_msg);
 651 }
 652
 653 /* read inotify messages */
 654 static int handle_inotify(struct udev *udev)
 655 {
 656         int nbytes, pos;
 657         char *buf;
 658         struct inotify_event *ev;
 659
 660         if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
 661                 return 0;
 662
 663         buf = malloc(nbytes);
 664         if (buf == NULL) {
 665                 err(udev, "error getting buffer for inotify\n");
 666                 return -1;
 667         }
 668
 669         nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
 670
 671         for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
 672                 struct udev_device *dev;
 673
 674                 ev = (struct inotify_event *)(buf + pos);
 675                 if (ev->len) {
 676                         const char *s;
 677
 678                         info(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
 679                         s = strstr(ev->name, ".rules");
 680                         if (s == NULL)
 681                                 continue;
 682                         if (strlen(s) != strlen(".rules"))
 683                                 continue;
 684                         reload_config = true;
 685                         continue;
 686                 }
 687
 688                 dev = udev_watch_lookup(udev, ev->wd);
 689                 if (dev != NULL) {
 690                         info(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
 691                         if (ev->mask & IN_CLOSE_WRITE) {
 692                                 char filename[UTIL_PATH_SIZE];
 693                                 int fd;
 694
 695                                 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
 696                                 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
 697                                 fd = open(filename, O_WRONLY);
 698                                 if (fd < 0 || write(fd, "change", 6) < 0)
 699                                         info(udev, "error writing uevent: %m\n");
 700                                 close(fd);
 701                         }
 702                         if (ev->mask & IN_IGNORED)
 703                                 udev_watch_end(udev, dev);
 704
 705                         udev_device_unref(dev);
 706                 }
 707
 708         }
 709
 710         free(buf);
 711         return 0;
 712 }
 713
 714 static void handle_signal(struct udev *udev, int signo)
 715 {
 716         switch (signo) {
 717         case SIGINT:
 718         case SIGTERM:
 719                 udev_exit = true;
 720                 break;
 721         case SIGCHLD:
 722                 for (;;) {
 723                         pid_t pid;
 724                         int status;
 725                         struct udev_list_node *loop, *tmp;
 726
 727                         pid = waitpid(-1, &status, WNOHANG);
 728                         if (pid <= 0)
 729                                 break;
 730
 731                         udev_list_node_foreach_safe(loop, tmp, &worker_list) {
 732                                 struct worker *worker = node_to_worker(loop);
 733
 734                                 if (worker->pid != pid)
 735                                         continue;
 736
 737                                 info(udev, "worker [%u] exit\n", pid);
 738                                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 739                                         err(udev, "worker [%u] unexpectedly returned with status 0x%04x\n", pid, status);
 740                                         if (worker->event != NULL) {
 741                                                 err(udev, "worker [%u] failed while handling '%s'\n", pid, worker->event->devpath);
 742                                                 worker->event->exitcode = -32;
 743                                                 event_queue_delete(worker->event);
 744                                                 /* drop reference from running event */
 745                                                 worker_unref(worker);
 746                                         }
 747                                 }
 748                                 worker_unref(worker);
 749                                 break;
 750                         }
 751                 }
 752                 break;
 753         case SIGHUP:
 754                 reload_config = true;
 755                 break;
 756         }
 757 }
 758
 759 static void static_dev_create_from_modules(struct udev *udev)
 760 {
 761         struct utsname kernel;
 762         char modules[UTIL_PATH_SIZE];
 763         char buf[4096];
 764         FILE *f;
 765
 766         uname(&kernel);
 767         util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL);
 768         f = fopen(modules, "r");
 769         if (f == NULL)
 770                 return;
 771
 772         while (fgets(buf, sizeof(buf), f) != NULL) {
 773                 char *s;
 774                 const char *modname;
 775                 const char *devname;
 776                 const char *devno;
 777                 int maj, min;
 778                 char type;
 779                 mode_t mode;
 780                 char filename[UTIL_PATH_SIZE];
 781
 782                 if (buf[0] == '#')
 783                         continue;
 784
 785                 modname = buf;
 786                 s = strchr(modname, ' ');
 787                 if (s == NULL)
 788                         continue;
 789                 s[0] = '\0';
 790
 791                 devname = &s[1];
 792                 s = strchr(devname, ' ');
 793                 if (s == NULL)
 794                         continue;
 795                 s[0] = '\0';
 796
 797                 devno = &s[1];
 798                 s = strchr(devno, ' ');
 799                 if (s == NULL)
 800                         s = strchr(devno, '\n');
 801                 if (s != NULL)
 802                         s[0] = '\0';
 803                 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
 804                         continue;
 805
 806                 if (type == 'c')
 807                         mode = 0600 | S_IFCHR;
 808                 else if (type == 'b')
 809                         mode = 0600 | S_IFBLK;
 810                 else
 811                         continue;
 812
 813                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL);
 814                 util_create_path(udev, filename);
 815                 udev_selinux_setfscreatecon(udev, filename, mode);
 816                 info(udev, "mknod '%s' %c%u:%u\n", filename, type, maj, min);
 817                 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
 818                         utimensat(AT_FDCWD, filename, NULL, 0);
 819                 udev_selinux_resetfscreatecon(udev);
 820         }
 821
 822         fclose(f);
 823 }
 824
 825 static int copy_dir(struct udev *udev, DIR *dir_from, DIR *dir_to, int maxdepth)
 826 {
 827         struct dirent *dent;
 828
 829         for (dent = readdir(dir_from); dent != NULL; dent = readdir(dir_from)) {
 830                 struct stat stats;
 831
 832                 if (dent->d_name[0] == '.')
 833                         continue;
 834                 if (fstatat(dirfd(dir_from), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
 835                         continue;
 836
 837                 if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
 838                         udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, stats.st_mode & 0777);
 839                         if (mknodat(dirfd(dir_to), dent->d_name, stats.st_mode, stats.st_rdev) == 0) {
 840                                 fchmodat(dirfd(dir_to), dent->d_name, stats.st_mode & 0777, 0);
 841                                 fchownat(dirfd(dir_to), dent->d_name, stats.st_uid, stats.st_gid, 0);
 842                         } else {
 843                                 utimensat(dirfd(dir_to), dent->d_name, NULL, 0);
 844                         }
 845                         udev_selinux_resetfscreatecon(udev);
 846                 } else if (S_ISLNK(stats.st_mode)) {
 847                         char target[UTIL_PATH_SIZE];
 848                         ssize_t len;
 849
 850                         len = readlinkat(dirfd(dir_from), dent->d_name, target, sizeof(target));
 851                         if (len <= 0 || len == (ssize_t)sizeof(target))
 852                                 continue;
 853                         target[len] = '\0';
 854                         udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFLNK);
 855                         if (symlinkat(target, dirfd(dir_to), dent->d_name) < 0 && errno == EEXIST)
 856                                 utimensat(dirfd(dir_to), dent->d_name, NULL, AT_SYMLINK_NOFOLLOW);
 857                         udev_selinux_resetfscreatecon(udev);
 858                 } else if (S_ISDIR(stats.st_mode)) {
 859                         DIR *dir2_from, *dir2_to;
 860
 861                         if (maxdepth == 0)
 862                                 continue;
 863
 864                         udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFDIR|0755);
 865                         mkdirat(dirfd(dir_to), dent->d_name, 0755);
 866                         udev_selinux_resetfscreatecon(udev);
 867
 868                         dir2_to = fdopendir(openat(dirfd(dir_to), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
 869                         if (dir2_to == NULL)
 870                                 continue;
 871
 872                         dir2_from = fdopendir(openat(dirfd(dir_from), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
 873                         if (dir2_from == NULL) {
 874                                 closedir(dir2_to);
 875                                 continue;
 876                         }
 877
 878                         copy_dir(udev, dir2_from, dir2_to, maxdepth-1);
 879
 880                         closedir(dir2_to);
 881                         closedir(dir2_from);
 882                 }
 883         }
 884
 885         return 0;
 886 }
 887
 888 static void static_dev_create_links(struct udev *udev, DIR *dir)
 889 {
 890         struct stdlinks {
 891                 const char *link;
 892                 const char *target;
 893         };
 894         static const struct stdlinks stdlinks[] = {
 895                 { "core", "/proc/kcore" },
 896                 { "fd", "/proc/self/fd" },
 897                 { "stdin", "/proc/self/fd/0" },
 898                 { "stdout", "/proc/self/fd/1" },
 899                 { "stderr", "/proc/self/fd/2" },
 900         };
 901         unsigned int i;
 902
 903         for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
 904                 struct stat sb;
 905
 906                 if (stat(stdlinks[i].target, &sb) == 0) {
 907                         udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
 908                         if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
 909                                 utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
 910                         udev_selinux_resetfscreatecon(udev);
 911                 }
 912         }
 913 }
 914
 915 static void static_dev_create_from_devices(struct udev *udev, DIR *dir)
 916 {
 917         DIR *dir_from;
 918
 919         dir_from = opendir(LIBEXECDIR "/devices");
 920         if (dir_from == NULL)
 921                 return;
 922         copy_dir(udev, dir_from, dir, 8);
 923         closedir(dir_from);
 924 }
 925
 926 static void static_dev_create(struct udev *udev)
 927 {
 928         DIR *dir;
 929
 930         dir = opendir(udev_get_dev_path(udev));
 931         if (dir == NULL)
 932                 return;
 933
 934         static_dev_create_links(udev, dir);
 935         static_dev_create_from_devices(udev, dir);
 936
 937         closedir(dir);
 938 }
 939
 940 static int mem_size_mb(void)
 941 {
 942         FILE *f;
 943         char buf[4096];
 944         long int memsize = -1;
 945
 946         f = fopen("/proc/meminfo", "r");
 947         if (f == NULL)
 948                 return -1;
 949
 950         while (fgets(buf, sizeof(buf), f) != NULL) {
 951                 long int value;
 952
 953                 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
 954                         memsize = value / 1024;
 955                         break;
 956                 }
 957         }
 958
 959         fclose(f);
 960         return memsize;
 961 }
 962
 963 int main(int argc, char *argv[])
 964 {
 965         struct udev *udev;
 966         int fd;
 967         FILE *f;
 968         sigset_t mask;
 969         int daemonize = false;
 970         int resolve_names = 1;
 971         static const struct option options[] = {
 972                 { "daemon", no_argument, NULL, 'd' },
 973                 { "debug", no_argument, NULL, 'D' },
 974                 { "children-max", required_argument, NULL, 'c' },
 975                 { "exec-delay", required_argument, NULL, 'e' },
 976                 { "resolve-names", required_argument, NULL, 'N' },
 977                 { "help", no_argument, NULL, 'h' },
 978                 { "version", no_argument, NULL, 'V' },
 979                 {}
 980         };
 981         int rc = 1;
 982
 983         udev = udev_new();
 984         if (udev == NULL)
 985                 goto exit;
 986
 987         udev_log_init("udevd");
 988         udev_set_log_fn(udev, log_fn);
 989         info(udev, "version %s\n", VERSION);
 990         udev_selinux_init(udev);
 991
 992         for (;;) {
 993                 int option;
 994
 995                 option = getopt_long(argc, argv, "c:deDthV", options, NULL);
 996                 if (option == -1)
 997                         break;
 998
 999                 switch (option) {
1000                 case 'd':
1001                         daemonize = true;
1002                         break;
1003                 case 'c':
1004                         children_max = strtoul(optarg, NULL, 0);
1005                         break;
1006                 case 'e':
1007                         exec_delay = strtoul(optarg, NULL, 0);
1008                         break;
1009                 case 'D':
1010                         debug = true;
1011                         if (udev_get_log_priority(udev) < LOG_INFO)
1012                                 udev_set_log_priority(udev, LOG_INFO);
1013                         break;
1014                 case 'N':
1015                         if (strcmp (optarg, "early") == 0) {
1016                                 resolve_names = 1;
1017                         } else if (strcmp (optarg, "late") == 0) {
1018                                 resolve_names = 0;
1019                         } else if (strcmp (optarg, "never") == 0) {
1020                                 resolve_names = -1;
1021                         } else {
1022                                 fprintf(stderr, "resolve-names must be early, late or never\n");
1023                                 err(udev, "resolve-names must be early, late or never\n");
1024                                 goto exit;
1025                         }
1026                         break;
1027                 case 'h':
1028                         printf("Usage: udevd OPTIONS\n"
1029                                "  --daemon\n"
1030                                "  --debug\n"
1031                                "  --children-max=<maximum number of workers>\n"
1032                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
1033                                "  --resolve-names=early|late|never\n"
1034                                "  --version\n"
1035                                "  --help\n"
1036                                "\n");
1037                         goto exit;
1038                 case 'V':
1039                         printf("%s\n", VERSION);
1040                         goto exit;
1041                 default:
1042                         goto exit;
1043                 }
1044         }
1045
1046         /*
1047          * read the kernel commandline, in case we need to get into debug mode
1048          *   udev.log-priority=<level>              syslog priority
1049          *   udev.children-max=<number of workers>  events are fully serialized if set to 1
1050          *
1051          */
1052         f = fopen("/proc/cmdline", "r");
1053         if (f != NULL) {
1054                 char cmdline[4096];
1055
1056                 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
1057                         char *pos;
1058
1059                         pos = strstr(cmdline, "udev.log-priority=");
1060                         if (pos != NULL) {
1061                                 pos += strlen("udev.log-priority=");
1062                                 udev_set_log_priority(udev, util_log_priority(pos));
1063                         }
1064
1065                         pos = strstr(cmdline, "udev.children-max=");
1066                         if (pos != NULL) {
1067                                 pos += strlen("udev.children-max=");
1068                                 children_max = strtoul(pos, NULL, 0);
1069                         }
1070
1071                         pos = strstr(cmdline, "udev.exec-delay=");
1072                         if (pos != NULL) {
1073                                 pos += strlen("udev.exec-delay=");
1074                                 exec_delay = strtoul(pos, NULL, 0);
1075                         }
1076                 }
1077                 fclose(f);
1078         }
1079
1080         if (getuid() != 0) {
1081                 fprintf(stderr, "root privileges required\n");
1082                 err(udev, "root privileges required\n");
1083                 goto exit;
1084         }
1085
1086         /* set umask before creating any file/directory */
1087         chdir("/");
1088         umask(022);
1089
1090         /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1091         fd = open("/dev/null", O_RDWR);
1092         if (fd < 0) {
1093                 fprintf(stderr, "cannot open /dev/null\n");
1094                 err(udev, "cannot open /dev/null\n");
1095         }
1096         if (write(STDOUT_FILENO, 0, 0) < 0)
1097                 dup2(fd, STDOUT_FILENO);
1098         if (write(STDERR_FILENO, 0, 0) < 0)
1099                 dup2(fd, STDERR_FILENO);
1100
1101         udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
1102         if (udev_ctrl == NULL) {
1103                 fprintf(stderr, "error initializing control socket");
1104                 err(udev, "error initializing udevd socket");
1105                 rc = 1;
1106                 goto exit;
1107         }
1108         if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1109                 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
1110                 err(udev, "error binding control socket, seems udevd is already running\n");
1111                 rc = 1;
1112                 goto exit;
1113         }
1114         pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
1115
1116         monitor = udev_monitor_new_from_netlink(udev, "kernel");
1117         if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
1118                 fprintf(stderr, "error initializing netlink socket\n");
1119                 err(udev, "error initializing netlink socket\n");
1120                 rc = 3;
1121                 goto exit;
1122         }
1123         udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1124         pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
1125
1126         pfd[FD_INOTIFY].fd = udev_watch_init(udev);
1127         if (pfd[FD_INOTIFY].fd < 0) {
1128                 fprintf(stderr, "error initializing inotify\n");
1129                 err(udev, "error initializing inotify\n");
1130                 rc = 4;
1131                 goto exit;
1132         }
1133
1134         if (udev_get_rules_path(udev) != NULL) {
1135                 inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
1136                                   IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1137         } else {
1138                 char filename[UTIL_PATH_SIZE];
1139                 struct stat statbuf;
1140
1141                 inotify_add_watch(pfd[FD_INOTIFY].fd, LIBEXECDIR "/rules.d",
1142                                   IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1143                 inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
1144                                   IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1145
1146                 /* watch dynamic rules directory */
1147                 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
1148                 if (stat(filename, &statbuf) != 0) {
1149                         util_create_path(udev, filename);
1150                         udev_selinux_setfscreatecon(udev, filename, S_IFDIR|0755);
1151                         mkdir(filename, 0755);
1152                         udev_selinux_resetfscreatecon(udev);
1153                 }
1154                 inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
1155                                   IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1156         }
1157         udev_watch_restore(udev);
1158
1159         /* block and listen to all signals on signalfd */
1160         sigfillset(&mask);
1161         sigprocmask(SIG_SETMASK, &mask, &orig_sigmask);
1162         pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
1163         if (pfd[FD_SIGNAL].fd < 0) {
1164                 fprintf(stderr, "error getting signalfd\n");
1165                 err(udev, "error getting signalfd\n");
1166                 rc = 5;
1167                 goto exit;
1168         }
1169
1170         /* unnamed socket from workers to the main daemon */
1171         if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1172                 fprintf(stderr, "error getting socketpair\n");
1173                 err(udev, "error getting socketpair\n");
1174                 rc = 6;
1175                 goto exit;
1176         }
1177         pfd[FD_WORKER].fd = worker_watch[READ_END];
1178
1179         rules = udev_rules_new(udev, resolve_names);
1180         if (rules == NULL) {
1181                 err(udev, "error reading rules\n");
1182                 goto exit;
1183         }
1184
1185         udev_queue_export = udev_queue_export_new(udev);
1186         if (udev_queue_export == NULL) {
1187                 err(udev, "error creating queue file\n");
1188                 goto exit;
1189         }
1190
1191         if (!debug) {
1192                 dup2(fd, STDIN_FILENO);
1193                 dup2(fd, STDOUT_FILENO);
1194                 dup2(fd, STDERR_FILENO);
1195         }
1196         if (fd > STDERR_FILENO)
1197                 close(fd);
1198
1199         if (daemonize) {
1200                 pid_t pid;
1201
1202                 pid = fork();
1203                 switch (pid) {
1204                 case 0:
1205                         break;
1206                 case -1:
1207                         err(udev, "fork of daemon failed: %m\n");
1208                         rc = 4;
1209                         goto exit;
1210                 default:
1211                         rc = 0;
1212                         goto exit;
1213                 }
1214         } else {
1215                 sd_notify(1, "READY=1");
1216         }
1217
1218         /* set scheduling priority for the main daemon process */
1219         setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
1220
1221         setsid();
1222
1223         f = fopen("/dev/kmsg", "w");
1224         if (f != NULL) {
1225                 fprintf(f, "<6>udev[%u]: starting version " VERSION "\n", getpid());
1226                 fclose(f);
1227         }
1228
1229         fd = open("/proc/self/oom_score_adj", O_RDWR);
1230         if (fd < 0) {
1231                 /* Fallback to old interface */
1232                 fd = open("/proc/self/oom_adj", O_RDWR);
1233                 if (fd < 0) {
1234                         err(udev, "error disabling OOM: %m\n");
1235                 } else {
1236                         /* OOM_DISABLE == -17 */
1237                         write(fd, "-17", 3);
1238                         close(fd);
1239                 }
1240         } else {
1241                 write(fd, "-1000", 5);
1242                 close(fd);
1243         }
1244
1245         if (children_max <= 0) {
1246                 int memsize = mem_size_mb();
1247
1248                 /* set value depending on the amount of RAM */
1249                 if (memsize > 0)
1250                         children_max = 128 + (memsize / 8);
1251                 else
1252                         children_max = 128;
1253         }
1254         info(udev, "set children_max to %u\n", children_max);
1255
1256         static_dev_create(udev);
1257         static_dev_create_from_modules(udev);
1258         udev_rules_apply_static_dev_perms(rules);
1259
1260         udev_list_init(&event_list);
1261         udev_list_init(&worker_list);
1262
1263         while (!udev_exit) {
1264                 int fdcount;
1265                 int timeout;
1266
1267                 /* set timeout to kill idle workers */
1268                 if (udev_list_is_empty(&event_list) && children > 2)
1269                         timeout = 3 * 1000;
1270                 else
1271                         timeout = -1;
1272                 /* wait for events */
1273                 fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
1274                 if (fdcount < 0)
1275                         continue;
1276
1277                 /* timeout - kill idle workers */
1278                 if (fdcount == 0)
1279                         worker_kill(udev, 2);
1280
1281                 /* event has finished */
1282                 if (pfd[FD_WORKER].revents & POLLIN)
1283                         worker_returned();
1284
1285                 /* get kernel uevent */
1286                 if (pfd[FD_NETLINK].revents & POLLIN) {
1287                         struct udev_device *dev;
1288
1289                         dev = udev_monitor_receive_device(monitor);
1290                         if (dev != NULL)
1291                                 if (event_queue_insert(dev) < 0)
1292                                         udev_device_unref(dev);
1293                 }
1294
1295                 /* start new events */
1296                 if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
1297                         events_start(udev);
1298
1299                 /* get signal */
1300                 if (pfd[FD_SIGNAL].revents & POLLIN) {
1301                         struct signalfd_siginfo fdsi;
1302                         ssize_t size;
1303
1304                         size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
1305                         if (size == sizeof(struct signalfd_siginfo))
1306                                 handle_signal(udev, fdsi.ssi_signo);
1307                 }
1308
1309                 /* device node and rules directory inotify watch */
1310                 if (pfd[FD_INOTIFY].revents & POLLIN)
1311                         handle_inotify(udev);
1312
1313                 /*
1314                  * get control message
1315                  *
1316                  * This needs to be after the inotify handling, to make sure,
1317                  * that the settle signal is send back after the possibly generated
1318                  * "change" events by the inotify device node watch.
1319                  */
1320                 if (pfd[FD_CONTROL].revents & POLLIN)
1321                         handle_ctrl_msg(udev_ctrl);
1322
1323                 /* rules changed, set by inotify or a HUP signal */
1324                 if (reload_config) {
1325                         struct udev_rules *rules_new;
1326
1327                         worker_kill(udev, 0);
1328                         rules_new = udev_rules_new(udev, resolve_names);
1329                         if (rules_new != NULL) {
1330                                 udev_rules_unref(rules);
1331                                 rules = rules_new;
1332                         }
1333                         reload_config = 0;
1334                 }
1335         }
1336
1337         udev_queue_export_cleanup(udev_queue_export);
1338         rc = 0;
1339 exit:
1340         udev_queue_export_unref(udev_queue_export);
1341         udev_rules_unref(rules);
1342         udev_ctrl_unref(udev_ctrl);
1343         if (pfd[FD_SIGNAL].fd >= 0)
1344                 close(pfd[FD_SIGNAL].fd);
1345         if (worker_watch[READ_END] >= 0)
1346                 close(worker_watch[READ_END]);
1347         if (worker_watch[WRITE_END] >= 0)
1348                 close(worker_watch[WRITE_END]);
1349         udev_monitor_unref(monitor);
1350         udev_selinux_exit(udev);
1351         udev_unref(udev);
1352         udev_log_close();
1353         return rc;
1354 }