udev/udevd.c

   1 /*
   2  * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
   3  * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
   4  *
   5  *      This program is free software; you can redistribute it and/or modify it
   6  *      under the terms of the GNU General Public License as published by the
   7  *      Free Software Foundation version 2 of the License.
   8  *
   9  *      This program is distributed in the hope that it will be useful, but
  10  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *      General Public License for 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
  20 #include "config.h"
  21
  22 #include <stddef.h>
  23 #include <signal.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <dirent.h>
  31 #include <fcntl.h>
  32 #include <syslog.h>
  33 #include <time.h>
  34 #include <getopt.h>
  35 #include <sys/select.h>
  36 #include <sys/wait.h>
  37 #include <sys/types.h>
  38 #include <sys/socket.h>
  39 #include <sys/un.h>
  40 #include <sys/stat.h>
  41 #include <sys/ioctl.h>
  42 #include <linux/types.h>
  43 #include <linux/netlink.h>
  44 #ifdef HAVE_INOTIFY
  45 #include <sys/inotify.h>
  46 #endif
  47
  48 #include "udev.h"
  49 #include "udev_rules.h"
  50 #include "udevd.h"
  51 #include "udev_selinux.h"
  52
  53 static int 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                 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
  61                 vfprintf(stderr, format, args);
  62         } else {
  63                 vsyslog(priority, format, args);
  64         }
  65 }
  66
  67 struct udevd_uevent_msg {
  68         struct udev *udev;
  69         struct list_head node;
  70         pid_t pid;
  71         int exitstatus;
  72         time_t queue_time;
  73         char *action;
  74         char *devpath;
  75         char *subsystem;
  76         char *driver;
  77         dev_t devt;
  78         unsigned long long seqnum;
  79         char *devpath_old;
  80         char *physdevpath;
  81         unsigned int timeout;
  82         char *envp[UEVENT_NUM_ENVP+1];
  83         char envbuf[];
  84 };
  85
  86 static int debug_trace;
  87 static struct udev_rules rules;
  88 static int udevd_sock = -1;
  89 static int uevent_netlink_sock = -1;
  90 static int inotify_fd = -1;
  91 static pid_t sid;
  92
  93 static int signal_pipe[2] = {-1, -1};
  94 static volatile int sigchilds_waiting;
  95 static volatile int udev_exit;
  96 static volatile int reload_config;
  97 static int run_exec_q;
  98 static int stop_exec_q;
  99 static int max_childs;
 100 static int max_childs_running;
 101 static char udev_log_env[32];
 102
 103 static LIST_HEAD(exec_list);
 104 static LIST_HEAD(running_list);
 105
 106 static void asmlinkage udev_event_sig_handler(int signum)
 107 {
 108         if (signum == SIGALRM)
 109                 exit(1);
 110 }
 111
 112 static int udev_event_process(struct udevd_uevent_msg *msg)
 113 {
 114         struct sigaction act;
 115         struct udevice *udevice;
 116         int i;
 117         int retval;
 118
 119         /* set signal handlers */
 120         memset(&act, 0x00, sizeof(act));
 121         act.sa_handler = (void (*)(int)) udev_event_sig_handler;
 122         sigemptyset (&act.sa_mask);
 123         act.sa_flags = 0;
 124         sigaction(SIGALRM, &act, NULL);
 125
 126         /* reset to default */
 127         act.sa_handler = SIG_DFL;
 128         sigaction(SIGINT, &act, NULL);
 129         sigaction(SIGTERM, &act, NULL);
 130         sigaction(SIGCHLD, &act, NULL);
 131         sigaction(SIGHUP, &act, NULL);
 132
 133         /* trigger timeout to prevent hanging processes */
 134         alarm(UDEV_EVENT_TIMEOUT);
 135
 136         /* reconstruct event environment from message */
 137         for (i = 0; msg->envp[i]; i++)
 138                 putenv(msg->envp[i]);
 139
 140         udevice = udev_device_init(msg->udev);
 141         if (udevice == NULL)
 142                 return -1;
 143         strlcpy(udevice->action, msg->action, sizeof(udevice->action));
 144         sysfs_device_set_values(udevice->udev, udevice->dev, msg->devpath, msg->subsystem, msg->driver);
 145         udevice->devpath_old = msg->devpath_old;
 146         udevice->devt = msg->devt;
 147
 148         retval = udev_device_event(&rules, udevice);
 149
 150         /* rules may change/disable the timeout */
 151         if (udevice->event_timeout >= 0)
 152                 alarm(udevice->event_timeout);
 153
 154         /* run programs collected by RUN-key*/
 155         if (retval == 0 && !udevice->ignore_device && udev_get_run(msg->udev))
 156                 retval = udev_rules_run(udevice);
 157
 158         udev_device_cleanup(udevice);
 159         return retval;
 160 }
 161
 162 enum event_state {
 163         EVENT_QUEUED,
 164         EVENT_FINISHED,
 165         EVENT_FAILED,
 166 };
 167
 168 static void export_event_state(struct udevd_uevent_msg *msg, enum event_state state)
 169 {
 170         char filename[PATH_SIZE];
 171         char filename_failed[PATH_SIZE];
 172         size_t start;
 173
 174         /* location of queue file */
 175         snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu", udev_get_dev_path(msg->udev), msg->seqnum);
 176
 177         /* location of failed file */
 178         strlcpy(filename_failed, udev_get_dev_path(msg->udev), sizeof(filename_failed));
 179         strlcat(filename_failed, "/", sizeof(filename_failed));
 180         start = strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
 181         strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
 182         path_encode(&filename_failed[start], sizeof(filename_failed) - start);
 183
 184         switch (state) {
 185         case EVENT_QUEUED:
 186                 unlink(filename_failed);
 187                 delete_path(msg->udev, filename_failed);
 188                 create_path(msg->udev, filename);
 189                 selinux_setfscreatecon(msg->udev, filename, NULL, S_IFLNK);
 190                 symlink(msg->devpath, filename);
 191                 selinux_resetfscreatecon(msg->udev);
 192                 break;
 193         case EVENT_FINISHED:
 194                 if (msg->devpath_old != NULL) {
 195                         /* "move" event - rename failed file to current name, do not delete failed */
 196                         char filename_failed_old[PATH_SIZE];
 197
 198                         strlcpy(filename_failed_old, udev_get_dev_path(msg->udev), sizeof(filename_failed_old));
 199                         strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
 200                         start = strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
 201                         strlcat(filename_failed_old, msg->devpath_old, sizeof(filename_failed_old));
 202                         path_encode(&filename_failed_old[start], sizeof(filename) - start);
 203
 204                         if (rename(filename_failed_old, filename_failed) == 0)
 205                                 info(msg->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
 206                                      msg->devpath_old, msg->devpath);
 207                 } else {
 208                         unlink(filename_failed);
 209                         delete_path(msg->udev, filename_failed);
 210                 }
 211
 212                 unlink(filename);
 213                 delete_path(msg->udev, filename);
 214                 break;
 215         case EVENT_FAILED:
 216                 /* move failed event to the failed directory */
 217                 create_path(msg->udev, filename_failed);
 218                 rename(filename, filename_failed);
 219
 220                 /* clean up possibly empty queue directory */
 221                 delete_path(msg->udev, filename);
 222                 break;
 223         }
 224
 225         return;
 226 }
 227
 228 static void msg_queue_delete(struct udevd_uevent_msg *msg)
 229 {
 230         list_del(&msg->node);
 231
 232         /* mark as failed, if "add" event returns non-zero */
 233         if (msg->exitstatus && strcmp(msg->action, "add") == 0)
 234                 export_event_state(msg, EVENT_FAILED);
 235         else
 236                 export_event_state(msg, EVENT_FINISHED);
 237
 238         free(msg);
 239 }
 240
 241 static void udev_event_run(struct udevd_uevent_msg *msg)
 242 {
 243         pid_t pid;
 244         int retval;
 245
 246         pid = fork();
 247         switch (pid) {
 248         case 0:
 249                 /* child */
 250                 close(uevent_netlink_sock);
 251                 close(udevd_sock);
 252                 if (inotify_fd >= 0)
 253                         close(inotify_fd);
 254                 close(signal_pipe[READ_END]);
 255                 close(signal_pipe[WRITE_END]);
 256                 logging_close();
 257                 logging_init("udevd-event");
 258                 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
 259
 260                 retval = udev_event_process(msg);
 261                 info(msg->udev, "seq %llu finished with %i\n", msg->seqnum, retval);
 262
 263                 logging_close();
 264                 if (retval)
 265                         exit(1);
 266                 exit(0);
 267         case -1:
 268                 err(msg->udev, "fork of child failed: %s\n", strerror(errno));
 269                 msg_queue_delete(msg);
 270                 break;
 271         default:
 272                 /* get SIGCHLD in main loop */
 273                 info(msg->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
 274                      msg->seqnum, pid,  msg->action, msg->subsystem, time(NULL) - msg->queue_time);
 275                 msg->pid = pid;
 276         }
 277 }
 278
 279 static void msg_queue_insert(struct udevd_uevent_msg *msg)
 280 {
 281         char filename[PATH_SIZE];
 282         int fd;
 283
 284         msg->queue_time = time(NULL);
 285
 286         export_event_state(msg, EVENT_QUEUED);
 287         info(msg->udev, "seq %llu queued, '%s' '%s'\n", msg->seqnum, msg->action, msg->subsystem);
 288
 289         strlcpy(filename, udev_get_dev_path(msg->udev), sizeof(filename));
 290         strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
 291         fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
 292         if (fd >= 0) {
 293                 char str[32];
 294                 int len;
 295
 296                 len = sprintf(str, "%llu\n", msg->seqnum);
 297                 write(fd, str, len);
 298                 close(fd);
 299         }
 300
 301         /* run one event after the other in debug mode */
 302         if (debug_trace) {
 303                 list_add_tail(&msg->node, &running_list);
 304                 udev_event_run(msg);
 305                 waitpid(msg->pid, NULL, 0);
 306                 msg_queue_delete(msg);
 307                 return;
 308         }
 309
 310         /* run all events with a timeout set immediately */
 311         if (msg->timeout != 0) {
 312                 list_add_tail(&msg->node, &running_list);
 313                 udev_event_run(msg);
 314                 return;
 315         }
 316
 317         list_add_tail(&msg->node, &exec_list);
 318         run_exec_q = 1;
 319 }
 320
 321 static int mem_size_mb(void)
 322 {
 323         FILE* f;
 324         char buf[4096];
 325         long int memsize = -1;
 326
 327         f = fopen("/proc/meminfo", "r");
 328         if (f == NULL)
 329                 return -1;
 330
 331         while (fgets(buf, sizeof(buf), f) != NULL) {
 332                 long int value;
 333
 334                 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
 335                         memsize = value / 1024;
 336                         break;
 337                 }
 338         }
 339
 340         fclose(f);
 341         return memsize;
 342 }
 343
 344 static int cpu_count(void)
 345 {
 346         FILE* f;
 347         char buf[4096];
 348         int count = 0;
 349
 350         f = fopen("/proc/stat", "r");
 351         if (f == NULL)
 352                 return -1;
 353
 354         while (fgets(buf, sizeof(buf), f) != NULL) {
 355                 if (strncmp(buf, "cpu", 3) == 0 && isdigit(buf[3]))
 356                         count++;
 357         }
 358
 359         fclose(f);
 360         if (count == 0)
 361                 return -1;
 362         return count;
 363 }
 364
 365 static int running_processes(void)
 366 {
 367         FILE* f;
 368         char buf[4096];
 369         int running = -1;
 370
 371         f = fopen("/proc/stat", "r");
 372         if (f == NULL)
 373                 return -1;
 374
 375         while (fgets(buf, sizeof(buf), f) != NULL) {
 376                 int value;
 377
 378                 if (sscanf(buf, "procs_running %u", &value) == 1) {
 379                         running = value;
 380                         break;
 381                 }
 382         }
 383
 384         fclose(f);
 385         return running;
 386 }
 387
 388 /* return the number of process es in our session, count only until limit */
 389 static int running_processes_in_session(pid_t session, int limit)
 390 {
 391         DIR *dir;
 392         struct dirent *dent;
 393         int running = 0;
 394
 395         dir = opendir("/proc");
 396         if (!dir)
 397                 return -1;
 398
 399         /* read process info from /proc */
 400         for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
 401                 int f;
 402                 char procdir[64];
 403                 char line[256];
 404                 const char *pos;
 405                 char state;
 406                 pid_t ppid, pgrp, sess;
 407                 int len;
 408
 409                 if (!isdigit(dent->d_name[0]))
 410                         continue;
 411
 412                 snprintf(procdir, sizeof(procdir), "/proc/%s/stat", dent->d_name);
 413                 procdir[sizeof(procdir)-1] = '\0';
 414
 415                 f = open(procdir, O_RDONLY);
 416                 if (f == -1)
 417                         continue;
 418
 419                 len = read(f, line, sizeof(line)-1);
 420                 close(f);
 421
 422                 if (len <= 0)
 423                         continue;
 424                 else
 425                         line[len] = '\0';
 426
 427                 /* skip ugly program name */
 428                 pos = strrchr(line, ')') + 2;
 429                 if (pos == NULL)
 430                         continue;
 431
 432                 if (sscanf(pos, "%c %d %d %d ", &state, &ppid, &pgrp, &sess) != 4)
 433                         continue;
 434
 435                 /* count only processes in our session */
 436                 if (sess != session)
 437                         continue;
 438
 439                 /* count only running, no sleeping processes */
 440                 if (state != 'R')
 441                         continue;
 442
 443                 running++;
 444                 if (limit > 0 && running >= limit)
 445                         break;
 446         }
 447         closedir(dir);
 448
 449         return running;
 450 }
 451
 452 static int compare_devpath(const char *running, const char *waiting)
 453 {
 454         int i;
 455
 456         for (i = 0; i < PATH_SIZE; i++) {
 457                 /* identical device event found */
 458                 if (running[i] == '\0' && waiting[i] == '\0')
 459                         return 1;
 460
 461                 /* parent device event found */
 462                 if (running[i] == '\0' && waiting[i] == '/')
 463                         return 2;
 464
 465                 /* child device event found */
 466                 if (running[i] == '/' && waiting[i] == '\0')
 467                         return 3;
 468
 469                 /* no matching event */
 470                 if (running[i] != waiting[i])
 471                         break;
 472         }
 473
 474         return 0;
 475 }
 476
 477 /* lookup event for identical, parent, child, or physical device */
 478 static int devpath_busy(struct udevd_uevent_msg *msg, int limit)
 479 {
 480         struct udevd_uevent_msg *loop_msg;
 481         int childs_count = 0;
 482
 483         /* check exec-queue which may still contain delayed events we depend on */
 484         list_for_each_entry(loop_msg, &exec_list, node) {
 485                 /* skip ourself and all later events */
 486                 if (loop_msg->seqnum >= msg->seqnum)
 487                         break;
 488
 489                 /* check our old name */
 490                 if (msg->devpath_old != NULL)
 491                         if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
 492                                 return 2;
 493
 494                 /* check identical, parent, or child device event */
 495                 if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
 496                         dbg(msg->udev, "%llu, device event still pending %llu (%s)\n",
 497                             msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
 498                         return 3;
 499                 }
 500
 501                 /* check for our major:minor number */
 502                 if (msg->devt && loop_msg->devt == msg->devt &&
 503                     strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
 504                         dbg(msg->udev, "%llu, device event still pending %llu (%d:%d)\n", msg->seqnum,
 505                             loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
 506                         return 4;
 507                 }
 508
 509                 /* check physical device event (special case of parent) */
 510                 if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
 511                         if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
 512                                 dbg(msg->udev, "%llu, physical device event still pending %llu (%s)\n",
 513                                     msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
 514                                 return 5;
 515                         }
 516         }
 517
 518         /* check run queue for still running events */
 519         list_for_each_entry(loop_msg, &running_list, node) {
 520                 if (limit && childs_count++ > limit) {
 521                         dbg(msg->udev, "%llu, maximum number (%i) of childs reached\n", msg->seqnum, childs_count);
 522                         return 1;
 523                 }
 524
 525                 /* check our old name */
 526                 if (msg->devpath_old != NULL)
 527                         if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
 528                                 return 2;
 529
 530                 /* check identical, parent, or child device event */
 531                 if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
 532                         dbg(msg->udev, "%llu, device event still running %llu (%s)\n",
 533                             msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
 534                         return 3;
 535                 }
 536
 537                 /* check for our major:minor number */
 538                 if (msg->devt && loop_msg->devt == msg->devt &&
 539                     strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
 540                         dbg(msg->udev, "%llu, device event still running %llu (%d:%d)\n", msg->seqnum,
 541                             loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
 542                         return 4;
 543                 }
 544
 545                 /* check physical device event (special case of parent) */
 546                 if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
 547                         if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
 548                                 dbg(msg->udev, "%llu, physical device event still running %llu (%s)\n",
 549                                     msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
 550                                 return 5;
 551                         }
 552         }
 553         return 0;
 554 }
 555
 556 /* serializes events for the identical and parent and child devices */
 557 static void msg_queue_manager(struct udev *udev)
 558 {
 559         struct udevd_uevent_msg *loop_msg;
 560         struct udevd_uevent_msg *tmp_msg;
 561         int running;
 562
 563         if (list_empty(&exec_list))
 564                 return;
 565
 566         running = running_processes();
 567         dbg(udev, "%d processes runnning on system\n", running);
 568         if (running < 0)
 569                 running = max_childs_running;
 570
 571         list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
 572                 /* check running processes in our session and possibly throttle */
 573                 if (running >= max_childs_running) {
 574                         running = running_processes_in_session(sid, max_childs_running+10);
 575                         dbg(udev, "at least %d processes running in session\n", running);
 576                         if (running >= max_childs_running) {
 577                                 dbg(udev, "delay seq %llu, too many processes already running\n", loop_msg->seqnum);
 578                                 return;
 579                         }
 580                 }
 581
 582                 /* serialize and wait for parent or child events */
 583                 if (devpath_busy(loop_msg, max_childs) != 0) {
 584                         dbg(udev, "delay seq %llu (%s)\n", loop_msg->seqnum, loop_msg->devpath);
 585                         continue;
 586                 }
 587
 588                 /* move event to run list */
 589                 list_move_tail(&loop_msg->node, &running_list);
 590                 udev_event_run(loop_msg);
 591                 running++;
 592                 dbg(udev, "moved seq %llu to running list\n", loop_msg->seqnum);
 593         }
 594 }
 595
 596 static struct udevd_uevent_msg *get_msg_from_envbuf(struct udev *udev, const char *buf, int buf_size)
 597 {
 598         int bufpos;
 599         int i;
 600         struct udevd_uevent_msg *msg;
 601         char *physdevdriver_key = NULL;
 602         int maj = 0;
 603         int min = 0;
 604
 605         msg = malloc(sizeof(struct udevd_uevent_msg) + buf_size);
 606         if (msg == NULL)
 607                 return NULL;
 608         memset(msg, 0x00, sizeof(struct udevd_uevent_msg) + buf_size);
 609         msg->udev = udev;
 610
 611         /* copy environment buffer and reconstruct envp */
 612         memcpy(msg->envbuf, buf, buf_size);
 613         bufpos = 0;
 614         for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
 615                 int keylen;
 616                 char *key;
 617
 618                 key = &msg->envbuf[bufpos];
 619                 keylen = strlen(key);
 620                 msg->envp[i] = key;
 621                 bufpos += keylen + 1;
 622                 dbg(udev, "add '%s' to msg.envp[%i]\n", msg->envp[i], i);
 623
 624                 /* remember some keys for further processing */
 625                 if (strncmp(key, "ACTION=", 7) == 0)
 626                         msg->action = &key[7];
 627                 else if (strncmp(key, "DEVPATH=", 8) == 0)
 628                         msg->devpath = &key[8];
 629                 else if (strncmp(key, "SUBSYSTEM=", 10) == 0)
 630                         msg->subsystem = &key[10];
 631                 else if (strncmp(key, "DRIVER=", 7) == 0)
 632                         msg->driver = &key[7];
 633                 else if (strncmp(key, "SEQNUM=", 7) == 0)
 634                         msg->seqnum = strtoull(&key[7], NULL, 10);
 635                 else if (strncmp(key, "DEVPATH_OLD=", 12) == 0)
 636                         msg->devpath_old = &key[12];
 637                 else if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
 638                         msg->physdevpath = &key[12];
 639                 else if (strncmp(key, "PHYSDEVDRIVER=", 14) == 0)
 640                         physdevdriver_key = key;
 641                 else if (strncmp(key, "MAJOR=", 6) == 0)
 642                         maj = strtoull(&key[6], NULL, 10);
 643                 else if (strncmp(key, "MINOR=", 6) == 0)
 644                         min = strtoull(&key[6], NULL, 10);
 645                 else if (strncmp(key, "TIMEOUT=", 8) == 0)
 646                         msg->timeout = strtoull(&key[8], NULL, 10);
 647         }
 648         msg->devt = makedev(maj, min);
 649         msg->envp[i++] = "UDEVD_EVENT=1";
 650
 651         if (msg->driver == NULL && msg->physdevpath == NULL && physdevdriver_key != NULL) {
 652                 /* for older kernels DRIVER is empty for a bus device, export PHYSDEVDRIVER as DRIVER */
 653                 msg->envp[i++] = &physdevdriver_key[7];
 654                 msg->driver = &physdevdriver_key[14];
 655         }
 656
 657         msg->envp[i] = NULL;
 658
 659         if (msg->devpath == NULL || msg->action == NULL) {
 660                 info(udev, "DEVPATH or ACTION missing, ignore message\n");
 661                 free(msg);
 662                 return NULL;
 663         }
 664         return msg;
 665 }
 666
 667 /* receive the udevd message from userspace */
 668 static void get_ctrl_msg(struct udev *udev)
 669 {
 670         struct udevd_ctrl_msg ctrl_msg;
 671         ssize_t size;
 672         struct msghdr smsg;
 673         struct cmsghdr *cmsg;
 674         struct iovec iov;
 675         struct ucred *cred;
 676         char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
 677         char *pos;
 678
 679         memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
 680         iov.iov_base = &ctrl_msg;
 681         iov.iov_len = sizeof(struct udevd_ctrl_msg);
 682
 683         memset(&smsg, 0x00, sizeof(struct msghdr));
 684         smsg.msg_iov = &iov;
 685         smsg.msg_iovlen = 1;
 686         smsg.msg_control = cred_msg;
 687         smsg.msg_controllen = sizeof(cred_msg);
 688
 689         size = recvmsg(udevd_sock, &smsg, 0);
 690         if (size <  0) {
 691                 if (errno != EINTR)
 692                         err(udev, "unable to receive user udevd message: %s\n", strerror(errno));
 693                 return;
 694         }
 695         cmsg = CMSG_FIRSTHDR(&smsg);
 696         cred = (struct ucred *) CMSG_DATA(cmsg);
 697
 698         if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
 699                 err(udev, "no sender credentials received, message ignored\n");
 700                 return;
 701         }
 702
 703         if (cred->uid != 0) {
 704                 err(udev, "sender uid=%i, message ignored\n", cred->uid);
 705                 return;
 706         }
 707
 708         if (strncmp(ctrl_msg.magic, UDEVD_CTRL_MAGIC, sizeof(UDEVD_CTRL_MAGIC)) != 0 ) {
 709                 err(udev, "message magic '%s' doesn't match, ignore it\n", ctrl_msg.magic);
 710                 return;
 711         }
 712
 713         switch (ctrl_msg.type) {
 714         case UDEVD_CTRL_ENV:
 715                 pos = strchr(ctrl_msg.buf, '=');
 716                 if (pos == NULL) {
 717                         err(udev, "wrong key format '%s'\n", ctrl_msg.buf);
 718                         break;
 719                 }
 720                 pos[0] = '\0';
 721                 if (pos[1] == '\0') {
 722                         info(udev, "udevd message (ENV) received, unset '%s'\n", ctrl_msg.buf);
 723                         unsetenv(ctrl_msg.buf);
 724                 } else {
 725                         info(udev, "udevd message (ENV) received, set '%s=%s'\n", ctrl_msg.buf, &pos[1]);
 726                         setenv(ctrl_msg.buf, &pos[1], 1);
 727                 }
 728                 break;
 729         case UDEVD_CTRL_STOP_EXEC_QUEUE:
 730                 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
 731                 stop_exec_q = 1;
 732                 break;
 733         case UDEVD_CTRL_START_EXEC_QUEUE:
 734                 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
 735                 stop_exec_q = 0;
 736                 msg_queue_manager(udev);
 737                 break;
 738         case UDEVD_CTRL_SET_LOG_LEVEL:
 739                 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", ctrl_msg.intval);
 740                 udev_set_log_priority(udev, ctrl_msg.intval);
 741                 sprintf(udev_log_env, "UDEV_LOG=%i", udev_get_log_priority(udev));
 742                 putenv(udev_log_env);
 743                 break;
 744         case UDEVD_CTRL_SET_MAX_CHILDS:
 745                 info(udev, "udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i\n", ctrl_msg.intval);
 746                 max_childs = ctrl_msg.intval;
 747                 break;
 748         case UDEVD_CTRL_SET_MAX_CHILDS_RUNNING:
 749                 info(udev, "udevd message (UDEVD_SET_MAX_CHILDS_RUNNING) received, max_childs_running=%i\n", ctrl_msg.intval);
 750                 max_childs_running = ctrl_msg.intval;
 751                 break;
 752         case UDEVD_CTRL_RELOAD_RULES:
 753                 info(udev, "udevd message (RELOAD_RULES) received\n");
 754                 reload_config = 1;
 755                 break;
 756         default:
 757                 err(udev, "unknown control message type\n");
 758         }
 759 }
 760
 761 /* receive the kernel user event message and do some sanity checks */
 762 static struct udevd_uevent_msg *get_netlink_msg(struct udev *udev)
 763 {
 764         struct udevd_uevent_msg *msg;
 765         int bufpos;
 766         ssize_t size;
 767         static char buffer[UEVENT_BUFFER_SIZE+512];
 768         char *pos;
 769
 770         size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
 771         if (size <  0) {
 772                 if (errno != EINTR)
 773                         err(udev, "unable to receive kernel netlink message: %s\n", strerror(errno));
 774                 return NULL;
 775         }
 776
 777         if ((size_t)size > sizeof(buffer)-1)
 778                 size = sizeof(buffer)-1;
 779         buffer[size] = '\0';
 780         dbg(udev, "uevent_size=%zi\n", size);
 781
 782         /* start of event payload */
 783         bufpos = strlen(buffer)+1;
 784         msg = get_msg_from_envbuf(udev, &buffer[bufpos], size-bufpos);
 785         if (msg == NULL)
 786                 return NULL;
 787
 788         /* validate message */
 789         pos = strchr(buffer, '@');
 790         if (pos == NULL) {
 791                 err(udev, "invalid uevent '%s'\n", buffer);
 792                 free(msg);
 793                 return NULL;
 794         }
 795         pos[0] = '\0';
 796
 797         if (msg->action == NULL) {
 798                 info(udev, "no ACTION in payload found, skip event '%s'\n", buffer);
 799                 free(msg);
 800                 return NULL;
 801         }
 802
 803         if (strcmp(msg->action, buffer) != 0) {
 804                 err(udev, "ACTION in payload does not match uevent, skip event '%s'\n", buffer);
 805                 free(msg);
 806                 return NULL;
 807         }
 808
 809         return msg;
 810 }
 811
 812 static void asmlinkage sig_handler(int signum)
 813 {
 814         switch (signum) {
 815                 case SIGINT:
 816                 case SIGTERM:
 817                         udev_exit = 1;
 818                         break;
 819                 case SIGCHLD:
 820                         /* set flag, then write to pipe if needed */
 821                         sigchilds_waiting = 1;
 822                         break;
 823                 case SIGHUP:
 824                         reload_config = 1;
 825                         break;
 826         }
 827
 828         /* write to pipe, which will wakeup select() in our mainloop */
 829         write(signal_pipe[WRITE_END], "", 1);
 830 }
 831
 832 static void udev_done(int pid, int exitstatus)
 833 {
 834         /* find msg associated with pid and delete it */
 835         struct udevd_uevent_msg *msg;
 836
 837         list_for_each_entry(msg, &running_list, node) {
 838                 if (msg->pid == pid) {
 839                         info(msg->udev, "seq %llu, pid [%d] exit with %i, %ld seconds old\n", msg->seqnum, msg->pid,
 840                              exitstatus, time(NULL) - msg->queue_time);
 841                         msg->exitstatus = exitstatus;
 842                         msg_queue_delete(msg);
 843
 844                         /* there may be events waiting with the same devpath */
 845                         run_exec_q = 1;
 846                         return;
 847                 }
 848         }
 849 }
 850
 851 static void reap_sigchilds(void)
 852 {
 853         pid_t pid;
 854         int status;
 855
 856         while (1) {
 857                 pid = waitpid(-1, &status, WNOHANG);
 858                 if (pid <= 0)
 859                         break;
 860                 if (WIFEXITED(status))
 861                         status = WEXITSTATUS(status);
 862                 else if (WIFSIGNALED(status))
 863                         status = WTERMSIG(status) + 128;
 864                 else
 865                         status = 0;
 866                 udev_done(pid, status);
 867         }
 868 }
 869
 870 static int init_udevd_socket(struct udev *udev)
 871 {
 872         struct sockaddr_un saddr;
 873         socklen_t addrlen;
 874         const int feature_on = 1;
 875         int retval;
 876
 877         memset(&saddr, 0x00, sizeof(saddr));
 878         saddr.sun_family = AF_LOCAL;
 879         strcpy(saddr.sun_path, UDEVD_CTRL_SOCK_PATH);
 880         addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path);
 881         /* translate leading '@' to abstract namespace */
 882         if (saddr.sun_path[0] == '@')
 883                 saddr.sun_path[0] = '\0';
 884
 885         udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
 886         if (udevd_sock == -1) {
 887                 err(udev, "error getting socket: %s\n", strerror(errno));
 888                 return -1;
 889         }
 890
 891         /* the bind takes care of ensuring only one copy running */
 892         retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
 893         if (retval < 0) {
 894                 err(udev, "bind failed: %s\n", strerror(errno));
 895                 close(udevd_sock);
 896                 udevd_sock = -1;
 897                 return -1;
 898         }
 899
 900         /* enable receiving of the sender credentials */
 901         setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
 902
 903         return 0;
 904 }
 905
 906 static int init_uevent_netlink_sock(struct udev *udev)
 907 {
 908         struct sockaddr_nl snl;
 909         const int buffersize = 16 * 1024 * 1024;
 910         int retval;
 911
 912         memset(&snl, 0x00, sizeof(struct sockaddr_nl));
 913         snl.nl_family = AF_NETLINK;
 914         snl.nl_pid = getpid();
 915         snl.nl_groups = 1;
 916
 917         uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
 918         if (uevent_netlink_sock == -1) {
 919                 err(udev, "error getting socket: %s\n", strerror(errno));
 920                 return -1;
 921         }
 922
 923         /* set receive buffersize */
 924         setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
 925
 926         retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
 927         if (retval < 0) {
 928                 err(udev, "bind failed: %s\n", strerror(errno));
 929                 close(uevent_netlink_sock);
 930                 uevent_netlink_sock = -1;
 931                 return -1;
 932         }
 933         return 0;
 934 }
 935
 936 static void export_initial_seqnum(struct udev *udev)
 937 {
 938         char filename[PATH_SIZE];
 939         int fd;
 940         char seqnum[32];
 941         ssize_t len = 0;
 942
 943         strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
 944         strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
 945         fd = open(filename, O_RDONLY);
 946         if (fd >= 0) {
 947                 len = read(fd, seqnum, sizeof(seqnum)-1);
 948                 close(fd);
 949         }
 950         if (len <= 0) {
 951                 strcpy(seqnum, "0\n");
 952                 len = 3;
 953         }
 954         strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
 955         strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
 956         create_path(udev, filename);
 957         fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
 958         if (fd >= 0) {
 959                 write(fd, seqnum, len);
 960                 close(fd);
 961         }
 962 }
 963
 964 int main(int argc, char *argv[])
 965 {
 966         struct udev *udev;
 967         int retval;
 968         int fd;
 969         struct sigaction act;
 970         fd_set readfds;
 971         const char *value;
 972         int daemonize = 0;
 973         static const struct option options[] = {
 974                 { "daemon", 0, NULL, 'd' },
 975                 { "debug-trace", 0, NULL, 't' },
 976                 { "debug", 0, NULL, 'D' },
 977                 { "help", 0, NULL, 'h' },
 978                 { "version", 0, NULL, 'V' },
 979                 {}
 980         };
 981         int rc = 1;
 982         int maxfd;
 983
 984         udev = udev_new();
 985         if (udev == NULL)
 986                 goto exit;
 987
 988         logging_init("udevd");
 989         udev_set_log_fn(udev, log_fn);
 990
 991         selinux_init(udev);
 992         dbg(udev, "version %s\n", VERSION);
 993
 994         while (1) {
 995                 int option;
 996
 997                 option = getopt_long(argc, argv, "dDthV", options, NULL);
 998                 if (option == -1)
 999                         break;
1000
1001                 switch (option) {
1002                 case 'd':
1003                         daemonize = 1;
1004                         break;
1005                 case 't':
1006                         debug_trace = 1;
1007                         break;
1008                 case 'D':
1009                         debug = 1;
1010                         if (udev_get_log_priority(udev) < LOG_INFO)
1011                                 udev_set_log_priority(udev, LOG_INFO);
1012                         break;
1013                 case 'h':
1014                         printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
1015                         goto exit;
1016                 case 'V':
1017                         printf("%s\n", VERSION);
1018                         goto exit;
1019                 default:
1020                         goto exit;
1021                 }
1022         }
1023
1024         if (getuid() != 0) {
1025                 fprintf(stderr, "root privileges required\n");
1026                 err(udev, "root privileges required\n");
1027                 goto exit;
1028         }
1029
1030         /* make sure std{in,out,err} fd's are in a sane state */
1031         fd = open("/dev/null", O_RDWR);
1032         if (fd < 0) {
1033                 fprintf(stderr, "cannot open /dev/null\n");
1034                 err(udev, "cannot open /dev/null\n");
1035         }
1036         if (fd > STDIN_FILENO)
1037                 dup2(fd, STDIN_FILENO);
1038         if (write(STDOUT_FILENO, 0, 0) < 0)
1039                 dup2(fd, STDOUT_FILENO);
1040         if (write(STDERR_FILENO, 0, 0) < 0)
1041                 dup2(fd, STDERR_FILENO);
1042
1043         /* init sockets to receive events */
1044         if (init_udevd_socket(udev) < 0) {
1045                 if (errno == EADDRINUSE) {
1046                         fprintf(stderr, "another udev daemon already running\n");
1047                         err(udev, "another udev daemon already running\n");
1048                         rc = 1;
1049                 } else {
1050                         fprintf(stderr, "error initializing udevd socket\n");
1051                         err(udev, "error initializing udevd socket\n");
1052                         rc = 2;
1053                 }
1054                 goto exit;
1055         }
1056
1057         if (init_uevent_netlink_sock(udev) < 0) {
1058                 fprintf(stderr, "error initializing netlink socket\n");
1059                 err(udev, "error initializing netlink socket\n");
1060                 rc = 3;
1061                 goto exit;
1062         }
1063
1064         /* setup signal handler pipe */
1065         retval = pipe(signal_pipe);
1066         if (retval < 0) {
1067                 err(udev, "error getting pipes: %s\n", strerror(errno));
1068                 goto exit;
1069         }
1070
1071         retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
1072         if (retval < 0) {
1073                 err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
1074                 goto exit;
1075         }
1076         retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
1077         if (retval < 0) {
1078                 err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
1079                 goto exit;
1080         }
1081
1082         retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
1083         if (retval < 0) {
1084                 err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
1085                 goto exit;
1086         }
1087         retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
1088         if (retval < 0) {
1089                 err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
1090                 goto exit;
1091         }
1092
1093         /* parse the rules and keep them in memory */
1094         sysfs_init();
1095         udev_rules_init(udev, &rules, 1);
1096
1097         export_initial_seqnum(udev);
1098
1099         if (daemonize) {
1100                 pid_t pid;
1101
1102                 pid = fork();
1103                 switch (pid) {
1104                 case 0:
1105                         dbg(udev, "daemonized fork running\n");
1106                         break;
1107                 case -1:
1108                         err(udev, "fork of daemon failed: %s\n", strerror(errno));
1109                         rc = 4;
1110                         goto exit;
1111                 default:
1112                         dbg(udev, "child [%u] running, parent exits\n", pid);
1113                         rc = 0;
1114                         goto exit;
1115                 }
1116         }
1117
1118         /* redirect std{out,err} fd's */
1119         if (!debug)
1120                 dup2(fd, STDOUT_FILENO);
1121         dup2(fd, STDERR_FILENO);
1122         if (fd > STDERR_FILENO)
1123                 close(fd);
1124
1125         /* set scheduling priority for the daemon */
1126         setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
1127
1128         chdir("/");
1129         umask(022);
1130
1131         /* become session leader */
1132         sid = setsid();
1133         dbg(udev, "our session is %d\n", sid);
1134
1135         /* OOM_DISABLE == -17 */
1136         fd = open("/proc/self/oom_adj", O_RDWR);
1137         if (fd < 0)
1138                 err(udev, "error disabling OOM: %s\n", strerror(errno));
1139         else {
1140                 write(fd, "-17", 3);
1141                 close(fd);
1142         }
1143
1144         fd = open("/dev/kmsg", O_WRONLY);
1145         if (fd > 0) {
1146                 const char *str = "<6>udevd version " VERSION " started\n";
1147
1148                 write(fd, str, strlen(str));
1149                 close(fd);
1150         }
1151
1152         /* set signal handlers */
1153         memset(&act, 0x00, sizeof(struct sigaction));
1154         act.sa_handler = (void (*)(int)) sig_handler;
1155         sigemptyset(&act.sa_mask);
1156         act.sa_flags = SA_RESTART;
1157         sigaction(SIGINT, &act, NULL);
1158         sigaction(SIGTERM, &act, NULL);
1159         sigaction(SIGCHLD, &act, NULL);
1160         sigaction(SIGHUP, &act, NULL);
1161
1162         /* watch rules directory */
1163         inotify_fd = inotify_init();
1164         if (inotify_fd >= 0) {
1165                 if (udev_get_rules_path(udev) != NULL) {
1166                         inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
1167                                           IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1168                 } else {
1169                         char filename[PATH_MAX];
1170
1171                         inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
1172                                           IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1173                         inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
1174                                           IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1175
1176                         /* watch dynamic rules directory */
1177                         strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
1178                         strlcat(filename, "/.udev/rules.d", sizeof(filename));
1179                         inotify_add_watch(inotify_fd, filename,
1180                                           IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1181                 }
1182         } else if (errno == ENOSYS)
1183                 err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
1184         else
1185                 err(udev, "inotify_init failed: %s\n", strerror(errno));
1186
1187         /* maximum limit of forked childs */
1188         value = getenv("UDEVD_MAX_CHILDS");
1189         if (value)
1190                 max_childs = strtoul(value, NULL, 10);
1191         else {
1192                 int memsize = mem_size_mb();
1193                 if (memsize > 0)
1194                         max_childs = 128 + (memsize / 4);
1195                 else
1196                         max_childs = UDEVD_MAX_CHILDS;
1197         }
1198         info(udev, "initialize max_childs to %u\n", max_childs);
1199
1200         /* start to throttle forking if maximum number of _running_ childs is reached */
1201         value = getenv("UDEVD_MAX_CHILDS_RUNNING");
1202         if (value)
1203                 max_childs_running = strtoull(value, NULL, 10);
1204         else {
1205                 int cpus = cpu_count();
1206                 if (cpus > 0)
1207                         max_childs_running = 8 + (8 * cpus);
1208                 else
1209                         max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
1210         }
1211         info(udev, "initialize max_childs_running to %u\n", max_childs_running);
1212
1213         /* clear environment for forked event processes */
1214         clearenv();
1215
1216         /* export log_priority , as called programs may want to follow that setting */
1217         sprintf(udev_log_env, "UDEV_LOG=%i", udev_get_log_priority(udev));
1218         putenv(udev_log_env);
1219         if (debug_trace)
1220                 putenv("DEBUG=1");
1221
1222         maxfd = udevd_sock;
1223         maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
1224         maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
1225         maxfd = UDEV_MAX(maxfd, inotify_fd);
1226
1227         while (!udev_exit) {
1228                 struct udevd_uevent_msg *msg;
1229                 int fdcount;
1230
1231                 FD_ZERO(&readfds);
1232                 FD_SET(signal_pipe[READ_END], &readfds);
1233                 FD_SET(udevd_sock, &readfds);
1234                 FD_SET(uevent_netlink_sock, &readfds);
1235                 if (inotify_fd >= 0)
1236                         FD_SET(inotify_fd, &readfds);
1237
1238                 fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
1239                 if (fdcount < 0) {
1240                         if (errno != EINTR)
1241                                 err(udev, "error in select: %s\n", strerror(errno));
1242                         continue;
1243                 }
1244
1245                 /* get control message */
1246                 if (FD_ISSET(udevd_sock, &readfds))
1247                         get_ctrl_msg(udev);
1248
1249                 /* get netlink message */
1250                 if (FD_ISSET(uevent_netlink_sock, &readfds)) {
1251                         msg = get_netlink_msg(udev);
1252                         if (msg)
1253                                 msg_queue_insert(msg);
1254                 }
1255
1256                 /* received a signal, clear our notification pipe */
1257                 if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
1258                         char buf[256];
1259
1260                         read(signal_pipe[READ_END], &buf, sizeof(buf));
1261                 }
1262
1263                 /* rules directory inotify watch */
1264                 if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
1265                         int nbytes;
1266
1267                         /* discard all possible events, we can just reload the config */
1268                         if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
1269                                 char *buf;
1270
1271                                 reload_config = 1;
1272                                 buf = malloc(nbytes);
1273                                 if (buf == NULL) {
1274                                         err(udev, "error getting buffer for inotify, disable watching\n");
1275                                         close(inotify_fd);
1276                                         inotify_fd = -1;
1277                                 }
1278                                 read(inotify_fd, buf, nbytes);
1279                                 free(buf);
1280                         }
1281                 }
1282
1283                 /* rules changed, set by inotify or a HUP signal */
1284                 if (reload_config) {
1285                         reload_config = 0;
1286                         udev_rules_cleanup(&rules);
1287                         udev_rules_init(udev, &rules, 1);
1288                 }
1289
1290                 /* forked child has returned */
1291                 if (sigchilds_waiting) {
1292                         sigchilds_waiting = 0;
1293                         reap_sigchilds();
1294                 }
1295
1296                 if (run_exec_q) {
1297                         run_exec_q = 0;
1298                         if (!stop_exec_q)
1299                                 msg_queue_manager(udev);
1300                 }
1301         }
1302         rc = 0;
1303
1304 exit:
1305         udev_rules_cleanup(&rules);
1306         sysfs_cleanup();
1307         selinux_exit(udev);
1308
1309         if (signal_pipe[READ_END] >= 0)
1310                 close(signal_pipe[READ_END]);
1311         if (signal_pipe[WRITE_END] >= 0)
1312                 close(signal_pipe[WRITE_END]);
1313
1314         if (udevd_sock >= 0)
1315                 close(udevd_sock);
1316         if (inotify_fd >= 0)
1317                 close(inotify_fd);
1318         if (uevent_netlink_sock >= 0)
1319                 close(uevent_netlink_sock);
1320
1321         logging_close();
1322         return rc;
1323 }