src/udev/udevd.c

   1 /*
   2  * Copyright (C) 2004-2012 Kay Sievers <kay@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/epoll.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 #include "cgroup-util.h"
  50 #include "dev-setup.h"
  51 #include "fileio.h"
  52
  53 static bool debug;
  54
  55 void udev_main_log(struct udev *udev, int priority,
  56                    const char *file, int line, const char *fn,
  57                    const char *format, va_list args)
  58 {
  59         log_metav(priority, file, line, fn, format, args);
  60 }
  61
  62 static struct udev_rules *rules;
  63 static struct udev_queue_export *udev_queue_export;
  64 static struct udev_ctrl *udev_ctrl;
  65 static struct udev_monitor *monitor;
  66 static int worker_watch[2] = { -1, -1 };
  67 static int fd_signal = -1;
  68 static int fd_ep = -1;
  69 static int fd_inotify = -1;
  70 static bool stop_exec_queue;
  71 static bool reload;
  72 static int children;
  73 static int children_max;
  74 static int exec_delay;
  75 static sigset_t sigmask_orig;
  76 static UDEV_LIST(event_list);
  77 static UDEV_LIST(worker_list);
  78 char *udev_cgroup;
  79 static bool udev_exit;
  80
  81 enum event_state {
  82         EVENT_UNDEF,
  83         EVENT_QUEUED,
  84         EVENT_RUNNING,
  85 };
  86
  87 struct event {
  88         struct udev_list_node node;
  89         struct udev *udev;
  90         struct udev_device *dev;
  91         enum event_state state;
  92         int exitcode;
  93         unsigned long long int delaying_seqnum;
  94         unsigned long long int seqnum;
  95         const char *devpath;
  96         size_t devpath_len;
  97         const char *devpath_old;
  98         dev_t devnum;
  99         int ifindex;
 100         bool is_block;
 101 #ifdef HAVE_FIRMWARE
 102         bool nodelay;
 103 #endif
 104 };
 105
 106 static inline struct event *node_to_event(struct udev_list_node *node)
 107 {
 108         return container_of(node, struct event, node);
 109 }
 110
 111 static void event_queue_cleanup(struct udev *udev, enum event_state type);
 112
 113 enum worker_state {
 114         WORKER_UNDEF,
 115         WORKER_RUNNING,
 116         WORKER_IDLE,
 117         WORKER_KILLED,
 118 };
 119
 120 struct worker {
 121         struct udev_list_node node;
 122         struct udev *udev;
 123         int refcount;
 124         pid_t pid;
 125         struct udev_monitor *monitor;
 126         enum worker_state state;
 127         struct event *event;
 128         usec_t event_start_usec;
 129 };
 130
 131 /* passed from worker to main process */
 132 struct worker_message {
 133         pid_t pid;
 134         int exitcode;
 135 };
 136
 137 static inline struct worker *node_to_worker(struct udev_list_node *node)
 138 {
 139         return container_of(node, struct worker, node);
 140 }
 141
 142 static void event_queue_delete(struct event *event, bool export)
 143 {
 144         udev_list_node_remove(&event->node);
 145
 146         if (export) {
 147                 udev_queue_export_device_finished(udev_queue_export, event->dev);
 148                 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
 149         }
 150         udev_device_unref(event->dev);
 151         free(event);
 152 }
 153
 154 static struct worker *worker_ref(struct worker *worker)
 155 {
 156         worker->refcount++;
 157         return worker;
 158 }
 159
 160 static void worker_cleanup(struct worker *worker)
 161 {
 162         udev_list_node_remove(&worker->node);
 163         udev_monitor_unref(worker->monitor);
 164         children--;
 165         free(worker);
 166 }
 167
 168 static void worker_unref(struct worker *worker)
 169 {
 170         worker->refcount--;
 171         if (worker->refcount > 0)
 172                 return;
 173         log_debug("worker [%u] cleaned up\n", worker->pid);
 174         worker_cleanup(worker);
 175 }
 176
 177 static void worker_list_cleanup(struct udev *udev)
 178 {
 179         struct udev_list_node *loop, *tmp;
 180
 181         udev_list_node_foreach_safe(loop, tmp, &worker_list) {
 182                 struct worker *worker = node_to_worker(loop);
 183
 184                 worker_cleanup(worker);
 185         }
 186 }
 187
 188 static void worker_new(struct event *event)
 189 {
 190         struct udev *udev = event->udev;
 191         struct worker *worker;
 192         struct udev_monitor *worker_monitor;
 193         pid_t pid;
 194
 195         /* listen for new events */
 196         worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
 197         if (worker_monitor == NULL)
 198                 return;
 199         /* allow the main daemon netlink address to send devices to the worker */
 200         udev_monitor_allow_unicast_sender(worker_monitor, monitor);
 201         udev_monitor_enable_receiving(worker_monitor);
 202
 203         worker = calloc(1, sizeof(struct worker));
 204         if (worker == NULL) {
 205                 udev_monitor_unref(worker_monitor);
 206                 return;
 207         }
 208         /* worker + event reference */
 209         worker->refcount = 2;
 210         worker->udev = udev;
 211
 212         pid = fork();
 213         switch (pid) {
 214         case 0: {
 215                 struct udev_device *dev = NULL;
 216                 int fd_monitor;
 217                 struct epoll_event ep_signal, ep_monitor;
 218                 sigset_t mask;
 219                 int rc = EXIT_SUCCESS;
 220
 221                 /* take initial device from queue */
 222                 dev = event->dev;
 223                 event->dev = NULL;
 224
 225                 free(worker);
 226                 worker_list_cleanup(udev);
 227                 event_queue_cleanup(udev, EVENT_UNDEF);
 228                 udev_queue_export_unref(udev_queue_export);
 229                 udev_monitor_unref(monitor);
 230                 udev_ctrl_unref(udev_ctrl);
 231                 close(fd_signal);
 232                 close(fd_ep);
 233                 close(worker_watch[READ_END]);
 234
 235                 sigfillset(&mask);
 236                 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
 237                 if (fd_signal < 0) {
 238                         log_error("error creating signalfd %m\n");
 239                         rc = 2;
 240                         goto out;
 241                 }
 242
 243                 fd_ep = epoll_create1(EPOLL_CLOEXEC);
 244                 if (fd_ep < 0) {
 245                         log_error("error creating epoll fd: %m\n");
 246                         rc = 3;
 247                         goto out;
 248                 }
 249
 250                 memset(&ep_signal, 0, sizeof(struct epoll_event));
 251                 ep_signal.events = EPOLLIN;
 252                 ep_signal.data.fd = fd_signal;
 253
 254                 fd_monitor = udev_monitor_get_fd(worker_monitor);
 255                 memset(&ep_monitor, 0, sizeof(struct epoll_event));
 256                 ep_monitor.events = EPOLLIN;
 257                 ep_monitor.data.fd = fd_monitor;
 258
 259                 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
 260                     epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
 261                         log_error("fail to add fds to epoll: %m\n");
 262                         rc = 4;
 263                         goto out;
 264                 }
 265
 266                 /* request TERM signal if parent exits */
 267                 prctl(PR_SET_PDEATHSIG, SIGTERM);
 268
 269                 /* reset OOM score, we only protect the main daemon */
 270                 write_string_file("/proc/self/oom_score_adj", "0");
 271
 272                 for (;;) {
 273                         struct udev_event *udev_event;
 274                         struct worker_message msg;
 275                         int err;
 276
 277                         log_debug("seq %llu running\n", udev_device_get_seqnum(dev));
 278                         udev_event = udev_event_new(dev);
 279                         if (udev_event == NULL) {
 280                                 rc = 5;
 281                                 goto out;
 282                         }
 283
 284                         /* needed for SIGCHLD/SIGTERM in spawn() */
 285                         udev_event->fd_signal = fd_signal;
 286
 287                         if (exec_delay > 0)
 288                                 udev_event->exec_delay = exec_delay;
 289
 290                         /* apply rules, create node, symlinks */
 291                         err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
 292
 293                         if (err == 0)
 294                                 udev_event_execute_run(udev_event, &sigmask_orig);
 295
 296                         /* apply/restore inotify watch */
 297                         if (err == 0 && udev_event->inotify_watch) {
 298                                 udev_watch_begin(udev, dev);
 299                                 udev_device_update_db(dev);
 300                         }
 301
 302                         /* send processed event back to libudev listeners */
 303                         udev_monitor_send_device(worker_monitor, NULL, dev);
 304
 305                         /* send udevd the result of the event execution */
 306                         memset(&msg, 0, sizeof(struct worker_message));
 307                         if (err != 0)
 308                                 msg.exitcode = err;
 309                         msg.pid = getpid();
 310                         send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
 311
 312                         log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
 313
 314                         udev_device_unref(dev);
 315                         dev = NULL;
 316
 317                         if (udev_event->sigterm) {
 318                                 udev_event_unref(udev_event);
 319                                 goto out;
 320                         }
 321
 322                         udev_event_unref(udev_event);
 323
 324                         /* wait for more device messages from main udevd, or term signal */
 325                         while (dev == NULL) {
 326                                 struct epoll_event ev[4];
 327                                 int fdcount;
 328                                 int i;
 329
 330                                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
 331                                 if (fdcount < 0) {
 332                                         if (errno == EINTR)
 333                                                 continue;
 334                                         log_error("failed to poll: %m\n");
 335                                         goto out;
 336                                 }
 337
 338                                 for (i = 0; i < fdcount; i++) {
 339                                         if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
 340                                                 dev = udev_monitor_receive_device(worker_monitor);
 341                                                 break;
 342                                         } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
 343                                                 struct signalfd_siginfo fdsi;
 344                                                 ssize_t size;
 345
 346                                                 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
 347                                                 if (size != sizeof(struct signalfd_siginfo))
 348                                                         continue;
 349                                                 switch (fdsi.ssi_signo) {
 350                                                 case SIGTERM:
 351                                                         goto out;
 352                                                 }
 353                                         }
 354                                 }
 355                         }
 356                 }
 357 out:
 358                 udev_device_unref(dev);
 359                 if (fd_signal >= 0)
 360                         close(fd_signal);
 361                 if (fd_ep >= 0)
 362                         close(fd_ep);
 363                 close(fd_inotify);
 364                 close(worker_watch[WRITE_END]);
 365                 udev_rules_unref(rules);
 366                 udev_builtin_exit(udev);
 367                 udev_monitor_unref(worker_monitor);
 368                 udev_unref(udev);
 369                 log_close();
 370                 exit(rc);
 371         }
 372         case -1:
 373                 udev_monitor_unref(worker_monitor);
 374                 event->state = EVENT_QUEUED;
 375                 free(worker);
 376                 log_error("fork of child failed: %m\n");
 377                 break;
 378         default:
 379                 /* close monitor, but keep address around */
 380                 udev_monitor_disconnect(worker_monitor);
 381                 worker->monitor = worker_monitor;
 382                 worker->pid = pid;
 383                 worker->state = WORKER_RUNNING;
 384                 worker->event_start_usec = now(CLOCK_MONOTONIC);
 385                 worker->event = event;
 386                 event->state = EVENT_RUNNING;
 387                 udev_list_node_append(&worker->node, &worker_list);
 388                 children++;
 389                 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
 390                 break;
 391         }
 392 }
 393
 394 static void event_run(struct event *event)
 395 {
 396         struct udev_list_node *loop;
 397
 398         udev_list_node_foreach(loop, &worker_list) {
 399                 struct worker *worker = node_to_worker(loop);
 400                 ssize_t count;
 401
 402                 if (worker->state != WORKER_IDLE)
 403                         continue;
 404
 405                 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
 406                 if (count < 0) {
 407                         log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
 408                         kill(worker->pid, SIGKILL);
 409                         worker->state = WORKER_KILLED;
 410                         continue;
 411                 }
 412                 worker_ref(worker);
 413                 worker->event = event;
 414                 worker->state = WORKER_RUNNING;
 415                 worker->event_start_usec = now(CLOCK_MONOTONIC);
 416                 event->state = EVENT_RUNNING;
 417                 return;
 418         }
 419
 420         if (children >= children_max) {
 421                 if (children_max > 1)
 422                         log_debug("maximum number (%i) of children reached\n", children);
 423                 return;
 424         }
 425
 426         /* start new worker and pass initial device */
 427         worker_new(event);
 428 }
 429
 430 static int event_queue_insert(struct udev_device *dev)
 431 {
 432         struct event *event;
 433
 434         event = calloc(1, sizeof(struct event));
 435         if (event == NULL)
 436                 return -1;
 437
 438         event->udev = udev_device_get_udev(dev);
 439         event->dev = dev;
 440         event->seqnum = udev_device_get_seqnum(dev);
 441         event->devpath = udev_device_get_devpath(dev);
 442         event->devpath_len = strlen(event->devpath);
 443         event->devpath_old = udev_device_get_devpath_old(dev);
 444         event->devnum = udev_device_get_devnum(dev);
 445         event->is_block = streq("block", udev_device_get_subsystem(dev));
 446         event->ifindex = udev_device_get_ifindex(dev);
 447 #ifdef HAVE_FIRMWARE
 448         if (streq(udev_device_get_subsystem(dev), "firmware"))
 449                 event->nodelay = true;
 450 #endif
 451
 452         udev_queue_export_device_queued(udev_queue_export, dev);
 453         log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
 454              udev_device_get_action(dev), udev_device_get_subsystem(dev));
 455
 456         event->state = EVENT_QUEUED;
 457         udev_list_node_append(&event->node, &event_list);
 458         return 0;
 459 }
 460
 461 static void worker_kill(struct udev *udev)
 462 {
 463         struct udev_list_node *loop;
 464
 465         udev_list_node_foreach(loop, &worker_list) {
 466                 struct worker *worker = node_to_worker(loop);
 467
 468                 if (worker->state == WORKER_KILLED)
 469                         continue;
 470
 471                 worker->state = WORKER_KILLED;
 472                 kill(worker->pid, SIGTERM);
 473         }
 474 }
 475
 476 /* lookup event for identical, parent, child device */
 477 static bool is_devpath_busy(struct event *event)
 478 {
 479         struct udev_list_node *loop;
 480         size_t common;
 481
 482         /* check if queue contains events we depend on */
 483         udev_list_node_foreach(loop, &event_list) {
 484                 struct event *loop_event = node_to_event(loop);
 485
 486                 /* we already found a later event, earlier can not block us, no need to check again */
 487                 if (loop_event->seqnum < event->delaying_seqnum)
 488                         continue;
 489
 490                 /* event we checked earlier still exists, no need to check again */
 491                 if (loop_event->seqnum == event->delaying_seqnum)
 492                         return true;
 493
 494                 /* found ourself, no later event can block us */
 495                 if (loop_event->seqnum >= event->seqnum)
 496                         break;
 497
 498                 /* check major/minor */
 499                 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
 500                         return true;
 501
 502                 /* check network device ifindex */
 503                 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
 504                         return true;
 505
 506                 /* check our old name */
 507                 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
 508                         event->delaying_seqnum = loop_event->seqnum;
 509                         return true;
 510                 }
 511
 512                 /* compare devpath */
 513                 common = MIN(loop_event->devpath_len, event->devpath_len);
 514
 515                 /* one devpath is contained in the other? */
 516                 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
 517                         continue;
 518
 519                 /* identical device event found */
 520                 if (loop_event->devpath_len == event->devpath_len) {
 521                         /* devices names might have changed/swapped in the meantime */
 522                         if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
 523                                 continue;
 524                         if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
 525                                 continue;
 526                         event->delaying_seqnum = loop_event->seqnum;
 527                         return true;
 528                 }
 529
 530 #ifdef HAVE_FIRMWARE
 531                 /* allow to bypass the dependency tracking */
 532                 if (event->nodelay)
 533                         continue;
 534 #endif
 535
 536                 /* parent device event found */
 537                 if (event->devpath[common] == '/') {
 538                         event->delaying_seqnum = loop_event->seqnum;
 539                         return true;
 540                 }
 541
 542                 /* child device event found */
 543                 if (loop_event->devpath[common] == '/') {
 544                         event->delaying_seqnum = loop_event->seqnum;
 545                         return true;
 546                 }
 547
 548                 /* no matching device */
 549                 continue;
 550         }
 551
 552         return false;
 553 }
 554
 555 static void event_queue_start(struct udev *udev)
 556 {
 557         struct udev_list_node *loop;
 558
 559         udev_list_node_foreach(loop, &event_list) {
 560                 struct event *event = node_to_event(loop);
 561
 562                 if (event->state != EVENT_QUEUED)
 563                         continue;
 564
 565                 /* do not start event if parent or child event is still running */
 566                 if (is_devpath_busy(event))
 567                         continue;
 568
 569                 event_run(event);
 570         }
 571 }
 572
 573 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
 574 {
 575         struct udev_list_node *loop, *tmp;
 576
 577         udev_list_node_foreach_safe(loop, tmp, &event_list) {
 578                 struct event *event = node_to_event(loop);
 579
 580                 if (match_type != EVENT_UNDEF && match_type != event->state)
 581                         continue;
 582
 583                 event_queue_delete(event, false);
 584         }
 585 }
 586
 587 static void worker_returned(int fd_worker)
 588 {
 589         for (;;) {
 590                 struct worker_message msg;
 591                 ssize_t size;
 592                 struct udev_list_node *loop;
 593
 594                 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
 595                 if (size != sizeof(struct worker_message))
 596                         break;
 597
 598                 /* lookup worker who sent the signal */
 599                 udev_list_node_foreach(loop, &worker_list) {
 600                         struct worker *worker = node_to_worker(loop);
 601
 602                         if (worker->pid != msg.pid)
 603                                 continue;
 604
 605                         /* worker returned */
 606                         if (worker->event) {
 607                                 worker->event->exitcode = msg.exitcode;
 608                                 event_queue_delete(worker->event, true);
 609                                 worker->event = NULL;
 610                         }
 611                         if (worker->state != WORKER_KILLED)
 612                                 worker->state = WORKER_IDLE;
 613                         worker_unref(worker);
 614                         break;
 615                 }
 616         }
 617 }
 618
 619 /* receive the udevd message from userspace */
 620 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
 621 {
 622         struct udev *udev = udev_ctrl_get_udev(uctrl);
 623         struct udev_ctrl_connection *ctrl_conn;
 624         struct udev_ctrl_msg *ctrl_msg = NULL;
 625         const char *str;
 626         int i;
 627
 628         ctrl_conn = udev_ctrl_get_connection(uctrl);
 629         if (ctrl_conn == NULL)
 630                 goto out;
 631
 632         ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
 633         if (ctrl_msg == NULL)
 634                 goto out;
 635
 636         i = udev_ctrl_get_set_log_level(ctrl_msg);
 637         if (i >= 0) {
 638                 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
 639                 log_set_max_level(i);
 640                 udev_set_log_priority(udev, i);
 641                 worker_kill(udev);
 642         }
 643
 644         if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
 645                 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
 646                 stop_exec_queue = true;
 647         }
 648
 649         if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
 650                 log_debug("udevd message (START_EXEC_QUEUE) received\n");
 651                 stop_exec_queue = false;
 652         }
 653
 654         if (udev_ctrl_get_reload(ctrl_msg) > 0) {
 655                 log_debug("udevd message (RELOAD) received\n");
 656                 reload = true;
 657         }
 658
 659         str = udev_ctrl_get_set_env(ctrl_msg);
 660         if (str != NULL) {
 661                 char *key;
 662
 663                 key = strdup(str);
 664                 if (key != NULL) {
 665                         char *val;
 666
 667                         val = strchr(key, '=');
 668                         if (val != NULL) {
 669                                 val[0] = '\0';
 670                                 val = &val[1];
 671                                 if (val[0] == '\0') {
 672                                         log_debug("udevd message (ENV) received, unset '%s'\n", key);
 673                                         udev_add_property(udev, key, NULL);
 674                                 } else {
 675                                         log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val);
 676                                         udev_add_property(udev, key, val);
 677                                 }
 678                         } else {
 679                                 log_error("wrong key format '%s'\n", key);
 680                         }
 681                         free(key);
 682                 }
 683                 worker_kill(udev);
 684         }
 685
 686         i = udev_ctrl_get_set_children_max(ctrl_msg);
 687         if (i >= 0) {
 688                 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
 689                 children_max = i;
 690         }
 691
 692         if (udev_ctrl_get_ping(ctrl_msg) > 0)
 693                 log_debug("udevd message (SYNC) received\n");
 694
 695         if (udev_ctrl_get_exit(ctrl_msg) > 0) {
 696                 log_debug("udevd message (EXIT) received\n");
 697                 udev_exit = true;
 698                 /* keep reference to block the client until we exit */
 699                 udev_ctrl_connection_ref(ctrl_conn);
 700         }
 701 out:
 702         udev_ctrl_msg_unref(ctrl_msg);
 703         return udev_ctrl_connection_unref(ctrl_conn);
 704 }
 705
 706 /* read inotify messages */
 707 static int handle_inotify(struct udev *udev)
 708 {
 709         int nbytes, pos;
 710         char *buf;
 711         struct inotify_event *ev;
 712
 713         if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
 714                 return 0;
 715
 716         buf = malloc(nbytes);
 717         if (buf == NULL) {
 718                 log_error("error getting buffer for inotify\n");
 719                 return -1;
 720         }
 721
 722         nbytes = read(fd_inotify, buf, nbytes);
 723
 724         for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
 725                 struct udev_device *dev;
 726
 727                 ev = (struct inotify_event *)(buf + pos);
 728                 dev = udev_watch_lookup(udev, ev->wd);
 729                 if (dev != NULL) {
 730                         log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
 731                         if (ev->mask & IN_CLOSE_WRITE) {
 732                                 char filename[UTIL_PATH_SIZE];
 733                                 int fd;
 734
 735                                 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
 736                                 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
 737                                 fd = open(filename, O_WRONLY);
 738                                 if (fd >= 0) {
 739                                         if (write(fd, "change", 6) < 0)
 740                                                 log_debug("error writing uevent: %m\n");
 741                                         close(fd);
 742                                 }
 743                         }
 744                         if (ev->mask & IN_IGNORED)
 745                                 udev_watch_end(udev, dev);
 746
 747                         udev_device_unref(dev);
 748                 }
 749
 750         }
 751
 752         free(buf);
 753         return 0;
 754 }
 755
 756 static void handle_signal(struct udev *udev, int signo)
 757 {
 758         switch (signo) {
 759         case SIGINT:
 760         case SIGTERM:
 761                 udev_exit = true;
 762                 break;
 763         case SIGCHLD:
 764                 for (;;) {
 765                         pid_t pid;
 766                         int status;
 767                         struct udev_list_node *loop, *tmp;
 768
 769                         pid = waitpid(-1, &status, WNOHANG);
 770                         if (pid <= 0)
 771                                 break;
 772
 773                         udev_list_node_foreach_safe(loop, tmp, &worker_list) {
 774                                 struct worker *worker = node_to_worker(loop);
 775
 776                                 if (worker->pid != pid)
 777                                         continue;
 778                                 log_debug("worker [%u] exit\n", pid);
 779
 780                                 if (WIFEXITED(status)) {
 781                                         if (WEXITSTATUS(status) != 0)
 782                                                 log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
 783                                 } else if (WIFSIGNALED(status)) {
 784                                         log_error("worker [%u] terminated by signal %i (%s)\n",
 785                                             pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
 786                                 } else if (WIFSTOPPED(status)) {
 787                                         log_error("worker [%u] stopped\n", pid);
 788                                 } else if (WIFCONTINUED(status)) {
 789                                         log_error("worker [%u] continued\n", pid);
 790                                 } else {
 791                                         log_error("worker [%u] exit with status 0x%04x\n", pid, status);
 792                                 }
 793
 794                                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 795                                         if (worker->event) {
 796                                                 log_error("worker [%u] failed while handling '%s'\n",
 797                                                           pid, worker->event->devpath);
 798                                                 worker->event->exitcode = -32;
 799                                                 event_queue_delete(worker->event, true);
 800                                                 /* drop reference taken for state 'running' */
 801                                                 worker_unref(worker);
 802                                         }
 803                                 }
 804                                 worker_unref(worker);
 805                                 break;
 806                         }
 807                 }
 808                 break;
 809         case SIGHUP:
 810                 reload = true;
 811                 break;
 812         }
 813 }
 814
 815 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
 816 {
 817         int ctrl = -1, netlink = -1;
 818         int fd, n;
 819
 820         n = sd_listen_fds(true);
 821         if (n <= 0)
 822                 return -1;
 823
 824         for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
 825                 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
 826                         if (ctrl >= 0)
 827                                 return -1;
 828                         ctrl = fd;
 829                         continue;
 830                 }
 831
 832                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
 833                         if (netlink >= 0)
 834                                 return -1;
 835                         netlink = fd;
 836                         continue;
 837                 }
 838
 839                 return -1;
 840         }
 841
 842         if (ctrl < 0 || netlink < 0)
 843                 return -1;
 844
 845         log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
 846         *rctrl = ctrl;
 847         *rnetlink = netlink;
 848         return 0;
 849 }
 850
 851 /*
 852  * read the kernel commandline, in case we need to get into debug mode
 853  *   udev.log-priority=<level>              syslog priority
 854  *   udev.children-max=<number of workers>  events are fully serialized if set to 1
 855  *   udev.exec-delay=<number of seconds>    delay execution of every executed program
 856  */
 857 static void kernel_cmdline_options(struct udev *udev)
 858 {
 859         char *line, *w, *state;
 860         size_t l;
 861
 862         if (read_one_line_file("/proc/cmdline", &line) < 0)
 863                 return;
 864
 865         FOREACH_WORD_QUOTED(w, l, line, state) {
 866                 char *s, *opt;
 867
 868                 s = strndup(w, l);
 869                 if (!s)
 870                         break;
 871
 872                 /* accept the same options for the initrd, prefixed with "rd." */
 873                 if (in_initrd() && startswith(s, "rd."))
 874                         opt = s + 3;
 875                 else
 876                         opt = s;
 877
 878                 if (startswith(opt, "udev.log-priority=")) {
 879                         int prio;
 880
 881                         prio = util_log_priority(opt + 18);
 882                         log_set_max_level(prio);
 883                         udev_set_log_priority(udev, prio);
 884                 } else if (startswith(opt, "udev.children-max=")) {
 885                         children_max = strtoul(opt + 18, NULL, 0);
 886                 } else if (startswith(opt, "udev.exec-delay=")) {
 887                         exec_delay = strtoul(opt + 16, NULL, 0);
 888                 }
 889
 890                 free(s);
 891         }
 892
 893         free(line);
 894 }
 895
 896 int main(int argc, char *argv[])
 897 {
 898         struct udev *udev;
 899         sigset_t mask;
 900         int daemonize = false;
 901         int resolve_names = 1;
 902         static const struct option options[] = {
 903                 { "daemon", no_argument, NULL, 'd' },
 904                 { "debug", no_argument, NULL, 'D' },
 905                 { "children-max", required_argument, NULL, 'c' },
 906                 { "exec-delay", required_argument, NULL, 'e' },
 907                 { "resolve-names", required_argument, NULL, 'N' },
 908                 { "help", no_argument, NULL, 'h' },
 909                 { "version", no_argument, NULL, 'V' },
 910                 {}
 911         };
 912         int fd_ctrl = -1;
 913         int fd_netlink = -1;
 914         int fd_worker = -1;
 915         struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
 916         struct udev_ctrl_connection *ctrl_conn = NULL;
 917         int rc = 1;
 918
 919         udev = udev_new();
 920         if (udev == NULL)
 921                 goto exit;
 922
 923         log_set_target(LOG_TARGET_AUTO);
 924         log_parse_environment();
 925         log_open();
 926         udev_set_log_fn(udev, udev_main_log);
 927         log_debug("version %s\n", VERSION);
 928         label_init("/dev");
 929
 930         for (;;) {
 931                 int option;
 932
 933                 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
 934                 if (option == -1)
 935                         break;
 936
 937                 switch (option) {
 938                 case 'd':
 939                         daemonize = true;
 940                         break;
 941                 case 'c':
 942                         children_max = strtoul(optarg, NULL, 0);
 943                         break;
 944                 case 'e':
 945                         exec_delay = strtoul(optarg, NULL, 0);
 946                         break;
 947                 case 'D':
 948                         debug = true;
 949                         log_set_max_level(LOG_DEBUG);
 950                         udev_set_log_priority(udev, LOG_DEBUG);
 951                         break;
 952                 case 'N':
 953                         if (streq(optarg, "early")) {
 954                                 resolve_names = 1;
 955                         } else if (streq(optarg, "late")) {
 956                                 resolve_names = 0;
 957                         } else if (streq(optarg, "never")) {
 958                                 resolve_names = -1;
 959                         } else {
 960                                 fprintf(stderr, "resolve-names must be early, late or never\n");
 961                                 log_error("resolve-names must be early, late or never\n");
 962                                 goto exit;
 963                         }
 964                         break;
 965                 case 'h':
 966                         printf("Usage: udevd OPTIONS\n"
 967                                "  --daemon\n"
 968                                "  --debug\n"
 969                                "  --children-max=<maximum number of workers>\n"
 970                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
 971                                "  --resolve-names=early|late|never\n"
 972                                "  --version\n"
 973                                "  --help\n"
 974                                "\n");
 975                         goto exit;
 976                 case 'V':
 977                         printf("%s\n", VERSION);
 978                         goto exit;
 979                 default:
 980                         goto exit;
 981                 }
 982         }
 983
 984         kernel_cmdline_options(udev);
 985
 986         if (getuid() != 0) {
 987                 fprintf(stderr, "root privileges required\n");
 988                 log_error("root privileges required\n");
 989                 goto exit;
 990         }
 991
 992         /* set umask before creating any file/directory */
 993         chdir("/");
 994         umask(022);
 995
 996         mkdir("/run/udev", 0755);
 997
 998         dev_setup(NULL);
 999
1000         /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1001         if (daemonize) {
1002                 int fd;
1003
1004                 fd = open("/dev/null", O_RDWR);
1005                 if (fd >= 0) {
1006                         if (write(STDOUT_FILENO, 0, 0) < 0)
1007                                 dup2(fd, STDOUT_FILENO);
1008                         if (write(STDERR_FILENO, 0, 0) < 0)
1009                                 dup2(fd, STDERR_FILENO);
1010                         if (fd > STDERR_FILENO)
1011                                 close(fd);
1012                 } else {
1013                         fprintf(stderr, "cannot open /dev/null\n");
1014                         log_error("cannot open /dev/null\n");
1015                 }
1016         }
1017
1018         if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1019                 /* get control and netlink socket from systemd */
1020                 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1021                 if (udev_ctrl == NULL) {
1022                         log_error("error taking over udev control socket");
1023                         rc = 1;
1024                         goto exit;
1025                 }
1026
1027                 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1028                 if (monitor == NULL) {
1029                         log_error("error taking over netlink socket\n");
1030                         rc = 3;
1031                         goto exit;
1032                 }
1033
1034                 /* get our own cgroup, we regularly kill everything udev has left behind */
1035                 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1036                         udev_cgroup = NULL;
1037         } else {
1038                 /* open control and netlink socket */
1039                 udev_ctrl = udev_ctrl_new(udev);
1040                 if (udev_ctrl == NULL) {
1041                         fprintf(stderr, "error initializing udev control socket");
1042                         log_error("error initializing udev control socket");
1043                         rc = 1;
1044                         goto exit;
1045                 }
1046                 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1047
1048                 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1049                 if (monitor == NULL) {
1050                         fprintf(stderr, "error initializing netlink socket\n");
1051                         log_error("error initializing netlink socket\n");
1052                         rc = 3;
1053                         goto exit;
1054                 }
1055                 fd_netlink = udev_monitor_get_fd(monitor);
1056         }
1057
1058         if (udev_monitor_enable_receiving(monitor) < 0) {
1059                 fprintf(stderr, "error binding netlink socket\n");
1060                 log_error("error binding netlink socket\n");
1061                 rc = 3;
1062                 goto exit;
1063         }
1064
1065         if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1066                 fprintf(stderr, "error binding udev control socket\n");
1067                 log_error("error binding udev control socket\n");
1068                 rc = 1;
1069                 goto exit;
1070         }
1071
1072         udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1073
1074         /* create queue file before signalling 'ready', to make sure we block 'settle' */
1075         udev_queue_export = udev_queue_export_new(udev);
1076         if (udev_queue_export == NULL) {
1077                 log_error("error creating queue file\n");
1078                 goto exit;
1079         }
1080
1081         if (daemonize) {
1082                 pid_t pid;
1083
1084                 pid = fork();
1085                 switch (pid) {
1086                 case 0:
1087                         break;
1088                 case -1:
1089                         log_error("fork of daemon failed: %m\n");
1090                         rc = 4;
1091                         goto exit;
1092                 default:
1093                         rc = EXIT_SUCCESS;
1094                         goto exit_daemonize;
1095                 }
1096
1097                 setsid();
1098
1099                 write_string_file("/proc/self/oom_score_adj", "-1000");
1100         } else {
1101                 sd_notify(1, "READY=1");
1102         }
1103
1104         print_kmsg("starting version " VERSION "\n");
1105
1106         if (!debug) {
1107                 int fd;
1108
1109                 fd = open("/dev/null", O_RDWR);
1110                 if (fd >= 0) {
1111                         dup2(fd, STDIN_FILENO);
1112                         dup2(fd, STDOUT_FILENO);
1113                         dup2(fd, STDERR_FILENO);
1114                         close(fd);
1115                 }
1116         }
1117
1118         fd_inotify = udev_watch_init(udev);
1119         if (fd_inotify < 0) {
1120                 fprintf(stderr, "error initializing inotify\n");
1121                 log_error("error initializing inotify\n");
1122                 rc = 4;
1123                 goto exit;
1124         }
1125         udev_watch_restore(udev);
1126
1127         /* block and listen to all signals on signalfd */
1128         sigfillset(&mask);
1129         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1130         fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1131         if (fd_signal < 0) {
1132                 fprintf(stderr, "error creating signalfd\n");
1133                 log_error("error creating signalfd\n");
1134                 rc = 5;
1135                 goto exit;
1136         }
1137
1138         /* unnamed socket from workers to the main daemon */
1139         if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1140                 fprintf(stderr, "error creating socketpair\n");
1141                 log_error("error creating socketpair\n");
1142                 rc = 6;
1143                 goto exit;
1144         }
1145         fd_worker = worker_watch[READ_END];
1146
1147         udev_builtin_init(udev);
1148
1149         rules = udev_rules_new(udev, resolve_names);
1150         if (rules == NULL) {
1151                 log_error("error reading rules\n");
1152                 goto exit;
1153         }
1154
1155         memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1156         ep_ctrl.events = EPOLLIN;
1157         ep_ctrl.data.fd = fd_ctrl;
1158
1159         memset(&ep_inotify, 0, sizeof(struct epoll_event));
1160         ep_inotify.events = EPOLLIN;
1161         ep_inotify.data.fd = fd_inotify;
1162
1163         memset(&ep_signal, 0, sizeof(struct epoll_event));
1164         ep_signal.events = EPOLLIN;
1165         ep_signal.data.fd = fd_signal;
1166
1167         memset(&ep_netlink, 0, sizeof(struct epoll_event));
1168         ep_netlink.events = EPOLLIN;
1169         ep_netlink.data.fd = fd_netlink;
1170
1171         memset(&ep_worker, 0, sizeof(struct epoll_event));
1172         ep_worker.events = EPOLLIN;
1173         ep_worker.data.fd = fd_worker;
1174
1175         fd_ep = epoll_create1(EPOLL_CLOEXEC);
1176         if (fd_ep < 0) {
1177                 log_error("error creating epoll fd: %m\n");
1178                 goto exit;
1179         }
1180         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1181             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1182             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1183             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1184             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1185                 log_error("fail to add fds to epoll: %m\n");
1186                 goto exit;
1187         }
1188
1189         if (children_max <= 0) {
1190                 cpu_set_t cpu_set;
1191
1192                 children_max = 8;
1193
1194                 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1195                         children_max +=  CPU_COUNT(&cpu_set) * 2;
1196                 }
1197         }
1198         log_debug("set children_max to %u\n", children_max);
1199
1200         udev_rules_apply_static_dev_perms(rules);
1201
1202         udev_list_node_init(&event_list);
1203         udev_list_node_init(&worker_list);
1204
1205         for (;;) {
1206                 static usec_t last_usec;
1207                 struct epoll_event ev[8];
1208                 int fdcount;
1209                 int timeout;
1210                 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1211                 int i;
1212
1213                 if (udev_exit) {
1214                         /* close sources of new events and discard buffered events */
1215                         if (fd_ctrl >= 0) {
1216                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1217                                 fd_ctrl = -1;
1218                         }
1219                         if (monitor != NULL) {
1220                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1221                                 udev_monitor_unref(monitor);
1222                                 monitor = NULL;
1223                         }
1224                         if (fd_inotify >= 0) {
1225                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1226                                 close(fd_inotify);
1227                                 fd_inotify = -1;
1228                         }
1229
1230                         /* discard queued events and kill workers */
1231                         event_queue_cleanup(udev, EVENT_QUEUED);
1232                         worker_kill(udev);
1233
1234                         /* exit after all has cleaned up */
1235                         if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1236                                 break;
1237
1238                         /* timeout at exit for workers to finish */
1239                         timeout = 30 * 1000;
1240                 } else if (udev_list_node_is_empty(&event_list) && !children) {
1241                         /* we are idle */
1242                         timeout = -1;
1243
1244                         /* cleanup possible left-over processes in our cgroup */
1245                         if (udev_cgroup)
1246                                 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1247                 } else {
1248                         /* kill idle or hanging workers */
1249                         timeout = 3 * 1000;
1250                 }
1251                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1252                 if (fdcount < 0)
1253                         continue;
1254
1255                 if (fdcount == 0) {
1256                         struct udev_list_node *loop;
1257
1258                         /* timeout */
1259                         if (udev_exit) {
1260                                 log_error("timeout, giving up waiting for workers to finish\n");
1261                                 break;
1262                         }
1263
1264                         /* kill idle workers */
1265                         if (udev_list_node_is_empty(&event_list)) {
1266                                 log_debug("cleanup idle workers\n");
1267                                 worker_kill(udev);
1268                         }
1269
1270                         /* check for hanging events */
1271                         udev_list_node_foreach(loop, &worker_list) {
1272                                 struct worker *worker = node_to_worker(loop);
1273
1274                                 if (worker->state != WORKER_RUNNING)
1275                                         continue;
1276
1277                                 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
1278                                         log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1279                                             worker->event ? worker->event->devpath : "<idle>");
1280                                         kill(worker->pid, SIGKILL);
1281                                         worker->state = WORKER_KILLED;
1282                                         /* drop reference taken for state 'running' */
1283                                         worker_unref(worker);
1284                                         if (worker->event) {
1285                                                 log_error("seq %llu '%s' killed\n",
1286                                                           udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1287                                                 worker->event->exitcode = -64;
1288                                                 event_queue_delete(worker->event, true);
1289                                                 worker->event = NULL;
1290                                         }
1291                                 }
1292                         }
1293
1294                 }
1295
1296                 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1297                 for (i = 0; i < fdcount; i++) {
1298                         if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1299                                 is_worker = true;
1300                         else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1301                                 is_netlink = true;
1302                         else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1303                                 is_signal = true;
1304                         else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1305                                 is_inotify = true;
1306                         else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1307                                 is_ctrl = true;
1308                 }
1309
1310                 /* check for changed config, every 3 seconds at most */
1311                 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
1312                         if (udev_rules_check_timestamp(rules))
1313                                 reload = true;
1314                         if (udev_builtin_validate(udev))
1315                                 reload = true;
1316
1317                         last_usec = now(CLOCK_MONOTONIC);
1318                 }
1319
1320                 /* reload requested, HUP signal received, rules changed, builtin changed */
1321                 if (reload) {
1322                         worker_kill(udev);
1323                         rules = udev_rules_unref(rules);
1324                         udev_builtin_exit(udev);
1325                         reload = false;
1326                 }
1327
1328                 /* event has finished */
1329                 if (is_worker)
1330                         worker_returned(fd_worker);
1331
1332                 if (is_netlink) {
1333                         struct udev_device *dev;
1334
1335                         dev = udev_monitor_receive_device(monitor);
1336                         if (dev != NULL) {
1337                                 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1338                                 if (event_queue_insert(dev) < 0)
1339                                         udev_device_unref(dev);
1340                         }
1341                 }
1342
1343                 /* start new events */
1344                 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1345                         udev_builtin_init(udev);
1346                         if (rules == NULL)
1347                                 rules = udev_rules_new(udev, resolve_names);
1348                         if (rules != NULL)
1349                                 event_queue_start(udev);
1350                 }
1351
1352                 if (is_signal) {
1353                         struct signalfd_siginfo fdsi;
1354                         ssize_t size;
1355
1356                         size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1357                         if (size == sizeof(struct signalfd_siginfo))
1358                                 handle_signal(udev, fdsi.ssi_signo);
1359                 }
1360
1361                 /* we are shutting down, the events below are not handled anymore */
1362                 if (udev_exit)
1363                         continue;
1364
1365                 /* device node watch */
1366                 if (is_inotify)
1367                         handle_inotify(udev);
1368
1369                 /*
1370                  * This needs to be after the inotify handling, to make sure,
1371                  * that the ping is send back after the possibly generated
1372                  * "change" events by the inotify device node watch.
1373                  *
1374                  * A single time we may receive a client connection which we need to
1375                  * keep open to block the client. It will be closed right before we
1376                  * exit.
1377                  */
1378                 if (is_ctrl)
1379                         ctrl_conn = handle_ctrl_msg(udev_ctrl);
1380         }
1381
1382         rc = EXIT_SUCCESS;
1383 exit:
1384         udev_queue_export_cleanup(udev_queue_export);
1385         udev_ctrl_cleanup(udev_ctrl);
1386 exit_daemonize:
1387         if (fd_ep >= 0)
1388                 close(fd_ep);
1389         worker_list_cleanup(udev);
1390         event_queue_cleanup(udev, EVENT_UNDEF);
1391         udev_rules_unref(rules);
1392         udev_builtin_exit(udev);
1393         if (fd_signal >= 0)
1394                 close(fd_signal);
1395         if (worker_watch[READ_END] >= 0)
1396                 close(worker_watch[READ_END]);
1397         if (worker_watch[WRITE_END] >= 0)
1398                 close(worker_watch[WRITE_END]);
1399         udev_monitor_unref(monitor);
1400         udev_queue_export_unref(udev_queue_export);
1401         udev_ctrl_connection_unref(ctrl_conn);
1402         udev_ctrl_unref(udev_ctrl);
1403         label_finish();
1404         udev_unref(udev);
1405         log_close();
1406         return rc;
1407 }