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                         udev_event_unref(udev_event);
 318
 319                         if (udev_event->sigterm)
 320                                 goto out;
 321
 322                         /* wait for more device messages from main udevd, or term signal */
 323                         while (dev == NULL) {
 324                                 struct epoll_event ev[4];
 325                                 int fdcount;
 326                                 int i;
 327
 328                                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
 329                                 if (fdcount < 0) {
 330                                         if (errno == EINTR)
 331                                                 continue;
 332                                         log_error("failed to poll: %m\n");
 333                                         goto out;
 334                                 }
 335
 336                                 for (i = 0; i < fdcount; i++) {
 337                                         if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
 338                                                 dev = udev_monitor_receive_device(worker_monitor);
 339                                                 break;
 340                                         } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
 341                                                 struct signalfd_siginfo fdsi;
 342                                                 ssize_t size;
 343
 344                                                 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
 345                                                 if (size != sizeof(struct signalfd_siginfo))
 346                                                         continue;
 347                                                 switch (fdsi.ssi_signo) {
 348                                                 case SIGTERM:
 349                                                         goto out;
 350                                                 }
 351                                         }
 352                                 }
 353                         }
 354                 }
 355 out:
 356                 udev_device_unref(dev);
 357                 if (fd_signal >= 0)
 358                         close(fd_signal);
 359                 if (fd_ep >= 0)
 360                         close(fd_ep);
 361                 close(fd_inotify);
 362                 close(worker_watch[WRITE_END]);
 363                 udev_rules_unref(rules);
 364                 udev_builtin_exit(udev);
 365                 udev_monitor_unref(worker_monitor);
 366                 udev_unref(udev);
 367                 log_close();
 368                 exit(rc);
 369         }
 370         case -1:
 371                 udev_monitor_unref(worker_monitor);
 372                 event->state = EVENT_QUEUED;
 373                 free(worker);
 374                 log_error("fork of child failed: %m\n");
 375                 break;
 376         default:
 377                 /* close monitor, but keep address around */
 378                 udev_monitor_disconnect(worker_monitor);
 379                 worker->monitor = worker_monitor;
 380                 worker->pid = pid;
 381                 worker->state = WORKER_RUNNING;
 382                 worker->event_start_usec = now(CLOCK_MONOTONIC);
 383                 worker->event = event;
 384                 event->state = EVENT_RUNNING;
 385                 udev_list_node_append(&worker->node, &worker_list);
 386                 children++;
 387                 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
 388                 break;
 389         }
 390 }
 391
 392 static void event_run(struct event *event)
 393 {
 394         struct udev_list_node *loop;
 395
 396         udev_list_node_foreach(loop, &worker_list) {
 397                 struct worker *worker = node_to_worker(loop);
 398                 ssize_t count;
 399
 400                 if (worker->state != WORKER_IDLE)
 401                         continue;
 402
 403                 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
 404                 if (count < 0) {
 405                         log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
 406                         kill(worker->pid, SIGKILL);
 407                         worker->state = WORKER_KILLED;
 408                         continue;
 409                 }
 410                 worker_ref(worker);
 411                 worker->event = event;
 412                 worker->state = WORKER_RUNNING;
 413                 worker->event_start_usec = now(CLOCK_MONOTONIC);
 414                 event->state = EVENT_RUNNING;
 415                 return;
 416         }
 417
 418         if (children >= children_max) {
 419                 if (children_max > 1)
 420                         log_debug("maximum number (%i) of children reached\n", children);
 421                 return;
 422         }
 423
 424         /* start new worker and pass initial device */
 425         worker_new(event);
 426 }
 427
 428 static int event_queue_insert(struct udev_device *dev)
 429 {
 430         struct event *event;
 431
 432         event = calloc(1, sizeof(struct event));
 433         if (event == NULL)
 434                 return -1;
 435
 436         event->udev = udev_device_get_udev(dev);
 437         event->dev = dev;
 438         event->seqnum = udev_device_get_seqnum(dev);
 439         event->devpath = udev_device_get_devpath(dev);
 440         event->devpath_len = strlen(event->devpath);
 441         event->devpath_old = udev_device_get_devpath_old(dev);
 442         event->devnum = udev_device_get_devnum(dev);
 443         event->is_block = streq("block", udev_device_get_subsystem(dev));
 444         event->ifindex = udev_device_get_ifindex(dev);
 445 #ifdef HAVE_FIRMWARE
 446         if (streq(udev_device_get_subsystem(dev), "firmware"))
 447                 event->nodelay = true;
 448 #endif
 449
 450         udev_queue_export_device_queued(udev_queue_export, dev);
 451         log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
 452              udev_device_get_action(dev), udev_device_get_subsystem(dev));
 453
 454         event->state = EVENT_QUEUED;
 455         udev_list_node_append(&event->node, &event_list);
 456         return 0;
 457 }
 458
 459 static void worker_kill(struct udev *udev)
 460 {
 461         struct udev_list_node *loop;
 462
 463         udev_list_node_foreach(loop, &worker_list) {
 464                 struct worker *worker = node_to_worker(loop);
 465
 466                 if (worker->state == WORKER_KILLED)
 467                         continue;
 468
 469                 worker->state = WORKER_KILLED;
 470                 kill(worker->pid, SIGTERM);
 471         }
 472 }
 473
 474 /* lookup event for identical, parent, child device */
 475 static bool is_devpath_busy(struct event *event)
 476 {
 477         struct udev_list_node *loop;
 478         size_t common;
 479
 480         /* check if queue contains events we depend on */
 481         udev_list_node_foreach(loop, &event_list) {
 482                 struct event *loop_event = node_to_event(loop);
 483
 484                 /* we already found a later event, earlier can not block us, no need to check again */
 485                 if (loop_event->seqnum < event->delaying_seqnum)
 486                         continue;
 487
 488                 /* event we checked earlier still exists, no need to check again */
 489                 if (loop_event->seqnum == event->delaying_seqnum)
 490                         return true;
 491
 492                 /* found ourself, no later event can block us */
 493                 if (loop_event->seqnum >= event->seqnum)
 494                         break;
 495
 496                 /* check major/minor */
 497                 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
 498                         return true;
 499
 500                 /* check network device ifindex */
 501                 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
 502                         return true;
 503
 504                 /* check our old name */
 505                 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
 506                         event->delaying_seqnum = loop_event->seqnum;
 507                         return true;
 508                 }
 509
 510                 /* compare devpath */
 511                 common = MIN(loop_event->devpath_len, event->devpath_len);
 512
 513                 /* one devpath is contained in the other? */
 514                 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
 515                         continue;
 516
 517                 /* identical device event found */
 518                 if (loop_event->devpath_len == event->devpath_len) {
 519                         /* devices names might have changed/swapped in the meantime */
 520                         if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
 521                                 continue;
 522                         if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
 523                                 continue;
 524                         event->delaying_seqnum = loop_event->seqnum;
 525                         return true;
 526                 }
 527
 528 #ifdef HAVE_FIRMWARE
 529                 /* allow to bypass the dependency tracking */
 530                 if (event->nodelay)
 531                         continue;
 532 #endif
 533
 534                 /* parent device event found */
 535                 if (event->devpath[common] == '/') {
 536                         event->delaying_seqnum = loop_event->seqnum;
 537                         return true;
 538                 }
 539
 540                 /* child device event found */
 541                 if (loop_event->devpath[common] == '/') {
 542                         event->delaying_seqnum = loop_event->seqnum;
 543                         return true;
 544                 }
 545
 546                 /* no matching device */
 547                 continue;
 548         }
 549
 550         return false;
 551 }
 552
 553 static void event_queue_start(struct udev *udev)
 554 {
 555         struct udev_list_node *loop;
 556
 557         udev_list_node_foreach(loop, &event_list) {
 558                 struct event *event = node_to_event(loop);
 559
 560                 if (event->state != EVENT_QUEUED)
 561                         continue;
 562
 563                 /* do not start event if parent or child event is still running */
 564                 if (is_devpath_busy(event))
 565                         continue;
 566
 567                 event_run(event);
 568         }
 569 }
 570
 571 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
 572 {
 573         struct udev_list_node *loop, *tmp;
 574
 575         udev_list_node_foreach_safe(loop, tmp, &event_list) {
 576                 struct event *event = node_to_event(loop);
 577
 578                 if (match_type != EVENT_UNDEF && match_type != event->state)
 579                         continue;
 580
 581                 event_queue_delete(event, false);
 582         }
 583 }
 584
 585 static void worker_returned(int fd_worker)
 586 {
 587         for (;;) {
 588                 struct worker_message msg;
 589                 ssize_t size;
 590                 struct udev_list_node *loop;
 591
 592                 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
 593                 if (size != sizeof(struct worker_message))
 594                         break;
 595
 596                 /* lookup worker who sent the signal */
 597                 udev_list_node_foreach(loop, &worker_list) {
 598                         struct worker *worker = node_to_worker(loop);
 599
 600                         if (worker->pid != msg.pid)
 601                                 continue;
 602
 603                         /* worker returned */
 604                         if (worker->event) {
 605                                 worker->event->exitcode = msg.exitcode;
 606                                 event_queue_delete(worker->event, true);
 607                                 worker->event = NULL;
 608                         }
 609                         if (worker->state != WORKER_KILLED)
 610                                 worker->state = WORKER_IDLE;
 611                         worker_unref(worker);
 612                         break;
 613                 }
 614         }
 615 }
 616
 617 /* receive the udevd message from userspace */
 618 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
 619 {
 620         struct udev *udev = udev_ctrl_get_udev(uctrl);
 621         struct udev_ctrl_connection *ctrl_conn;
 622         struct udev_ctrl_msg *ctrl_msg = NULL;
 623         const char *str;
 624         int i;
 625
 626         ctrl_conn = udev_ctrl_get_connection(uctrl);
 627         if (ctrl_conn == NULL)
 628                 goto out;
 629
 630         ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
 631         if (ctrl_msg == NULL)
 632                 goto out;
 633
 634         i = udev_ctrl_get_set_log_level(ctrl_msg);
 635         if (i >= 0) {
 636                 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
 637                 log_set_max_level(i);
 638                 udev_set_log_priority(udev, i);
 639                 worker_kill(udev);
 640         }
 641
 642         if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
 643                 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
 644                 stop_exec_queue = true;
 645         }
 646
 647         if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
 648                 log_debug("udevd message (START_EXEC_QUEUE) received\n");
 649                 stop_exec_queue = false;
 650         }
 651
 652         if (udev_ctrl_get_reload(ctrl_msg) > 0) {
 653                 log_debug("udevd message (RELOAD) received\n");
 654                 reload = true;
 655         }
 656
 657         str = udev_ctrl_get_set_env(ctrl_msg);
 658         if (str != NULL) {
 659                 char *key;
 660
 661                 key = strdup(str);
 662                 if (key != NULL) {
 663                         char *val;
 664
 665                         val = strchr(key, '=');
 666                         if (val != NULL) {
 667                                 val[0] = '\0';
 668                                 val = &val[1];
 669                                 if (val[0] == '\0') {
 670                                         log_debug("udevd message (ENV) received, unset '%s'\n", key);
 671                                         udev_add_property(udev, key, NULL);
 672                                 } else {
 673                                         log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val);
 674                                         udev_add_property(udev, key, val);
 675                                 }
 676                         } else {
 677                                 log_error("wrong key format '%s'\n", key);
 678                         }
 679                         free(key);
 680                 }
 681                 worker_kill(udev);
 682         }
 683
 684         i = udev_ctrl_get_set_children_max(ctrl_msg);
 685         if (i >= 0) {
 686                 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
 687                 children_max = i;
 688         }
 689
 690         if (udev_ctrl_get_ping(ctrl_msg) > 0)
 691                 log_debug("udevd message (SYNC) received\n");
 692
 693         if (udev_ctrl_get_exit(ctrl_msg) > 0) {
 694                 log_debug("udevd message (EXIT) received\n");
 695                 udev_exit = true;
 696                 /* keep reference to block the client until we exit */
 697                 udev_ctrl_connection_ref(ctrl_conn);
 698         }
 699 out:
 700         udev_ctrl_msg_unref(ctrl_msg);
 701         return udev_ctrl_connection_unref(ctrl_conn);
 702 }
 703
 704 /* read inotify messages */
 705 static int handle_inotify(struct udev *udev)
 706 {
 707         int nbytes, pos;
 708         char *buf;
 709         struct inotify_event *ev;
 710
 711         if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
 712                 return 0;
 713
 714         buf = malloc(nbytes);
 715         if (buf == NULL) {
 716                 log_error("error getting buffer for inotify\n");
 717                 return -1;
 718         }
 719
 720         nbytes = read(fd_inotify, buf, nbytes);
 721
 722         for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
 723                 struct udev_device *dev;
 724
 725                 ev = (struct inotify_event *)(buf + pos);
 726                 dev = udev_watch_lookup(udev, ev->wd);
 727                 if (dev != NULL) {
 728                         log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
 729                         if (ev->mask & IN_CLOSE_WRITE) {
 730                                 char filename[UTIL_PATH_SIZE];
 731                                 int fd;
 732
 733                                 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
 734                                 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
 735                                 fd = open(filename, O_WRONLY);
 736                                 if (fd >= 0) {
 737                                         if (write(fd, "change", 6) < 0)
 738                                                 log_debug("error writing uevent: %m\n");
 739                                         close(fd);
 740                                 }
 741                         }
 742                         if (ev->mask & IN_IGNORED)
 743                                 udev_watch_end(udev, dev);
 744
 745                         udev_device_unref(dev);
 746                 }
 747
 748         }
 749
 750         free(buf);
 751         return 0;
 752 }
 753
 754 static void handle_signal(struct udev *udev, int signo)
 755 {
 756         switch (signo) {
 757         case SIGINT:
 758         case SIGTERM:
 759                 udev_exit = true;
 760                 break;
 761         case SIGCHLD:
 762                 for (;;) {
 763                         pid_t pid;
 764                         int status;
 765                         struct udev_list_node *loop, *tmp;
 766
 767                         pid = waitpid(-1, &status, WNOHANG);
 768                         if (pid <= 0)
 769                                 break;
 770
 771                         udev_list_node_foreach_safe(loop, tmp, &worker_list) {
 772                                 struct worker *worker = node_to_worker(loop);
 773
 774                                 if (worker->pid != pid)
 775                                         continue;
 776                                 log_debug("worker [%u] exit\n", pid);
 777
 778                                 if (WIFEXITED(status)) {
 779                                         if (WEXITSTATUS(status) != 0)
 780                                                 log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
 781                                 } else if (WIFSIGNALED(status)) {
 782                                         log_error("worker [%u] terminated by signal %i (%s)\n",
 783                                             pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
 784                                 } else if (WIFSTOPPED(status)) {
 785                                         log_error("worker [%u] stopped\n", pid);
 786                                 } else if (WIFCONTINUED(status)) {
 787                                         log_error("worker [%u] continued\n", pid);
 788                                 } else {
 789                                         log_error("worker [%u] exit with status 0x%04x\n", pid, status);
 790                                 }
 791
 792                                 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
 793                                         if (worker->event) {
 794                                                 log_error("worker [%u] failed while handling '%s'\n",
 795                                                           pid, worker->event->devpath);
 796                                                 worker->event->exitcode = -32;
 797                                                 event_queue_delete(worker->event, true);
 798                                                 /* drop reference taken for state 'running' */
 799                                                 worker_unref(worker);
 800                                         }
 801                                 }
 802                                 worker_unref(worker);
 803                                 break;
 804                         }
 805                 }
 806                 break;
 807         case SIGHUP:
 808                 reload = true;
 809                 break;
 810         }
 811 }
 812
 813 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
 814 {
 815         int ctrl = -1, netlink = -1;
 816         int fd, n;
 817
 818         n = sd_listen_fds(true);
 819         if (n <= 0)
 820                 return -1;
 821
 822         for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
 823                 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
 824                         if (ctrl >= 0)
 825                                 return -1;
 826                         ctrl = fd;
 827                         continue;
 828                 }
 829
 830                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
 831                         if (netlink >= 0)
 832                                 return -1;
 833                         netlink = fd;
 834                         continue;
 835                 }
 836
 837                 return -1;
 838         }
 839
 840         if (ctrl < 0 || netlink < 0)
 841                 return -1;
 842
 843         log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
 844         *rctrl = ctrl;
 845         *rnetlink = netlink;
 846         return 0;
 847 }
 848
 849 /*
 850  * read the kernel commandline, in case we need to get into debug mode
 851  *   udev.log-priority=<level>              syslog priority
 852  *   udev.children-max=<number of workers>  events are fully serialized if set to 1
 853  *   udev.exec-delay=<number of seconds>    delay execution of every executed program
 854  */
 855 static void kernel_cmdline_options(struct udev *udev)
 856 {
 857         char *line, *w, *state;
 858         size_t l;
 859
 860         if (read_one_line_file("/proc/cmdline", &line) < 0)
 861                 return;
 862
 863         FOREACH_WORD_QUOTED(w, l, line, state) {
 864                 char *s, *opt;
 865
 866                 s = strndup(w, l);
 867                 if (!s)
 868                         break;
 869
 870                 /* accept the same options for the initrd, prefixed with "rd." */
 871                 if (in_initrd() && startswith(s, "rd."))
 872                         opt = s + 3;
 873                 else
 874                         opt = s;
 875
 876                 if (startswith(opt, "udev.log-priority=")) {
 877                         int prio;
 878
 879                         prio = util_log_priority(opt + 18);
 880                         log_set_max_level(prio);
 881                         udev_set_log_priority(udev, prio);
 882                 } else if (startswith(opt, "udev.children-max=")) {
 883                         children_max = strtoul(opt + 18, NULL, 0);
 884                 } else if (startswith(opt, "udev.exec-delay=")) {
 885                         exec_delay = strtoul(opt + 16, NULL, 0);
 886                 }
 887
 888                 free(s);
 889         }
 890
 891         free(line);
 892 }
 893
 894 int main(int argc, char *argv[])
 895 {
 896         struct udev *udev;
 897         sigset_t mask;
 898         int daemonize = false;
 899         int resolve_names = 1;
 900         static const struct option options[] = {
 901                 { "daemon", no_argument, NULL, 'd' },
 902                 { "debug", no_argument, NULL, 'D' },
 903                 { "children-max", required_argument, NULL, 'c' },
 904                 { "exec-delay", required_argument, NULL, 'e' },
 905                 { "resolve-names", required_argument, NULL, 'N' },
 906                 { "help", no_argument, NULL, 'h' },
 907                 { "version", no_argument, NULL, 'V' },
 908                 {}
 909         };
 910         int fd_ctrl = -1;
 911         int fd_netlink = -1;
 912         int fd_worker = -1;
 913         struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
 914         struct udev_ctrl_connection *ctrl_conn = NULL;
 915         int rc = 1;
 916
 917         udev = udev_new();
 918         if (udev == NULL)
 919                 goto exit;
 920
 921         log_set_target(LOG_TARGET_AUTO);
 922         log_parse_environment();
 923         log_open();
 924
 925         udev_set_log_fn(udev, udev_main_log);
 926         log_set_max_level(udev_get_log_priority(udev));
 927
 928         log_debug("version %s\n", VERSION);
 929         label_init("/dev");
 930
 931         for (;;) {
 932                 int option;
 933
 934                 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
 935                 if (option == -1)
 936                         break;
 937
 938                 switch (option) {
 939                 case 'd':
 940                         daemonize = true;
 941                         break;
 942                 case 'c':
 943                         children_max = strtoul(optarg, NULL, 0);
 944                         break;
 945                 case 'e':
 946                         exec_delay = strtoul(optarg, NULL, 0);
 947                         break;
 948                 case 'D':
 949                         debug = true;
 950                         log_set_max_level(LOG_DEBUG);
 951                         udev_set_log_priority(udev, LOG_DEBUG);
 952                         break;
 953                 case 'N':
 954                         if (streq(optarg, "early")) {
 955                                 resolve_names = 1;
 956                         } else if (streq(optarg, "late")) {
 957                                 resolve_names = 0;
 958                         } else if (streq(optarg, "never")) {
 959                                 resolve_names = -1;
 960                         } else {
 961                                 fprintf(stderr, "resolve-names must be early, late or never\n");
 962                                 log_error("resolve-names must be early, late or never\n");
 963                                 goto exit;
 964                         }
 965                         break;
 966                 case 'h':
 967                         printf("Usage: udevd OPTIONS\n"
 968                                "  --daemon\n"
 969                                "  --debug\n"
 970                                "  --children-max=<maximum number of workers>\n"
 971                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
 972                                "  --resolve-names=early|late|never\n"
 973                                "  --version\n"
 974                                "  --help\n"
 975                                "\n");
 976                         goto exit;
 977                 case 'V':
 978                         printf("%s\n", VERSION);
 979                         goto exit;
 980                 default:
 981                         goto exit;
 982                 }
 983         }
 984
 985         kernel_cmdline_options(udev);
 986
 987         if (getuid() != 0) {
 988                 fprintf(stderr, "root privileges required\n");
 989                 log_error("root privileges required\n");
 990                 goto exit;
 991         }
 992
 993         /* set umask before creating any file/directory */
 994         chdir("/");
 995         umask(022);
 996
 997         mkdir("/run/udev", 0755);
 998
 999         dev_setup(NULL);
1000
1001         /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1002         if (daemonize) {
1003                 int fd;
1004
1005                 fd = open("/dev/null", O_RDWR);
1006                 if (fd >= 0) {
1007                         if (write(STDOUT_FILENO, 0, 0) < 0)
1008                                 dup2(fd, STDOUT_FILENO);
1009                         if (write(STDERR_FILENO, 0, 0) < 0)
1010                                 dup2(fd, STDERR_FILENO);
1011                         if (fd > STDERR_FILENO)
1012                                 close(fd);
1013                 } else {
1014                         fprintf(stderr, "cannot open /dev/null\n");
1015                         log_error("cannot open /dev/null\n");
1016                 }
1017         }
1018
1019         if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1020                 /* get control and netlink socket from systemd */
1021                 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1022                 if (udev_ctrl == NULL) {
1023                         log_error("error taking over udev control socket");
1024                         rc = 1;
1025                         goto exit;
1026                 }
1027
1028                 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1029                 if (monitor == NULL) {
1030                         log_error("error taking over netlink socket\n");
1031                         rc = 3;
1032                         goto exit;
1033                 }
1034
1035                 /* get our own cgroup, we regularly kill everything udev has left behind */
1036                 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1037                         udev_cgroup = NULL;
1038         } else {
1039                 /* open control and netlink socket */
1040                 udev_ctrl = udev_ctrl_new(udev);
1041                 if (udev_ctrl == NULL) {
1042                         fprintf(stderr, "error initializing udev control socket");
1043                         log_error("error initializing udev control socket");
1044                         rc = 1;
1045                         goto exit;
1046                 }
1047                 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1048
1049                 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1050                 if (monitor == NULL) {
1051                         fprintf(stderr, "error initializing netlink socket\n");
1052                         log_error("error initializing netlink socket\n");
1053                         rc = 3;
1054                         goto exit;
1055                 }
1056                 fd_netlink = udev_monitor_get_fd(monitor);
1057         }
1058
1059         if (udev_monitor_enable_receiving(monitor) < 0) {
1060                 fprintf(stderr, "error binding netlink socket\n");
1061                 log_error("error binding netlink socket\n");
1062                 rc = 3;
1063                 goto exit;
1064         }
1065
1066         if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1067                 fprintf(stderr, "error binding udev control socket\n");
1068                 log_error("error binding udev control socket\n");
1069                 rc = 1;
1070                 goto exit;
1071         }
1072
1073         udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1074
1075         /* create queue file before signalling 'ready', to make sure we block 'settle' */
1076         udev_queue_export = udev_queue_export_new(udev);
1077         if (udev_queue_export == NULL) {
1078                 log_error("error creating queue file\n");
1079                 goto exit;
1080         }
1081
1082         if (daemonize) {
1083                 pid_t pid;
1084
1085                 pid = fork();
1086                 switch (pid) {
1087                 case 0:
1088                         break;
1089                 case -1:
1090                         log_error("fork of daemon failed: %m\n");
1091                         rc = 4;
1092                         goto exit;
1093                 default:
1094                         rc = EXIT_SUCCESS;
1095                         goto exit_daemonize;
1096                 }
1097
1098                 setsid();
1099
1100                 write_string_file("/proc/self/oom_score_adj", "-1000");
1101         } else {
1102                 sd_notify(1, "READY=1");
1103         }
1104
1105         print_kmsg("starting version " VERSION "\n");
1106
1107         if (!debug) {
1108                 int fd;
1109
1110                 fd = open("/dev/null", O_RDWR);
1111                 if (fd >= 0) {
1112                         dup2(fd, STDIN_FILENO);
1113                         dup2(fd, STDOUT_FILENO);
1114                         dup2(fd, STDERR_FILENO);
1115                         close(fd);
1116                 }
1117         }
1118
1119         fd_inotify = udev_watch_init(udev);
1120         if (fd_inotify < 0) {
1121                 fprintf(stderr, "error initializing inotify\n");
1122                 log_error("error initializing inotify\n");
1123                 rc = 4;
1124                 goto exit;
1125         }
1126         udev_watch_restore(udev);
1127
1128         /* block and listen to all signals on signalfd */
1129         sigfillset(&mask);
1130         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1131         fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1132         if (fd_signal < 0) {
1133                 fprintf(stderr, "error creating signalfd\n");
1134                 log_error("error creating signalfd\n");
1135                 rc = 5;
1136                 goto exit;
1137         }
1138
1139         /* unnamed socket from workers to the main daemon */
1140         if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1141                 fprintf(stderr, "error creating socketpair\n");
1142                 log_error("error creating socketpair\n");
1143                 rc = 6;
1144                 goto exit;
1145         }
1146         fd_worker = worker_watch[READ_END];
1147
1148         udev_builtin_init(udev);
1149
1150         rules = udev_rules_new(udev, resolve_names);
1151         if (rules == NULL) {
1152                 log_error("error reading rules\n");
1153                 goto exit;
1154         }
1155
1156         memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1157         ep_ctrl.events = EPOLLIN;
1158         ep_ctrl.data.fd = fd_ctrl;
1159
1160         memset(&ep_inotify, 0, sizeof(struct epoll_event));
1161         ep_inotify.events = EPOLLIN;
1162         ep_inotify.data.fd = fd_inotify;
1163
1164         memset(&ep_signal, 0, sizeof(struct epoll_event));
1165         ep_signal.events = EPOLLIN;
1166         ep_signal.data.fd = fd_signal;
1167
1168         memset(&ep_netlink, 0, sizeof(struct epoll_event));
1169         ep_netlink.events = EPOLLIN;
1170         ep_netlink.data.fd = fd_netlink;
1171
1172         memset(&ep_worker, 0, sizeof(struct epoll_event));
1173         ep_worker.events = EPOLLIN;
1174         ep_worker.data.fd = fd_worker;
1175
1176         fd_ep = epoll_create1(EPOLL_CLOEXEC);
1177         if (fd_ep < 0) {
1178                 log_error("error creating epoll fd: %m\n");
1179                 goto exit;
1180         }
1181         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1182             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1183             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1184             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1185             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1186                 log_error("fail to add fds to epoll: %m\n");
1187                 goto exit;
1188         }
1189
1190         if (children_max <= 0) {
1191                 cpu_set_t cpu_set;
1192
1193                 children_max = 8;
1194
1195                 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1196                         children_max +=  CPU_COUNT(&cpu_set) * 2;
1197                 }
1198         }
1199         log_debug("set children_max to %u\n", children_max);
1200
1201         rc = udev_rules_apply_static_dev_perms(rules);
1202         if (rc < 0)
1203                 log_error("failed to apply permissions on static device nodes - %s\n", strerror(-rc));
1204
1205         udev_list_node_init(&event_list);
1206         udev_list_node_init(&worker_list);
1207
1208         for (;;) {
1209                 static usec_t last_usec;
1210                 struct epoll_event ev[8];
1211                 int fdcount;
1212                 int timeout;
1213                 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1214                 int i;
1215
1216                 if (udev_exit) {
1217                         /* close sources of new events and discard buffered events */
1218                         if (fd_ctrl >= 0) {
1219                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1220                                 fd_ctrl = -1;
1221                         }
1222                         if (monitor != NULL) {
1223                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1224                                 udev_monitor_unref(monitor);
1225                                 monitor = NULL;
1226                         }
1227                         if (fd_inotify >= 0) {
1228                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1229                                 close(fd_inotify);
1230                                 fd_inotify = -1;
1231                         }
1232
1233                         /* discard queued events and kill workers */
1234                         event_queue_cleanup(udev, EVENT_QUEUED);
1235                         worker_kill(udev);
1236
1237                         /* exit after all has cleaned up */
1238                         if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1239                                 break;
1240
1241                         /* timeout at exit for workers to finish */
1242                         timeout = 30 * 1000;
1243                 } else if (udev_list_node_is_empty(&event_list) && !children) {
1244                         /* we are idle */
1245                         timeout = -1;
1246
1247                         /* cleanup possible left-over processes in our cgroup */
1248                         if (udev_cgroup)
1249                                 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1250                 } else {
1251                         /* kill idle or hanging workers */
1252                         timeout = 3 * 1000;
1253                 }
1254                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1255                 if (fdcount < 0)
1256                         continue;
1257
1258                 if (fdcount == 0) {
1259                         struct udev_list_node *loop;
1260
1261                         /* timeout */
1262                         if (udev_exit) {
1263                                 log_error("timeout, giving up waiting for workers to finish\n");
1264                                 break;
1265                         }
1266
1267                         /* kill idle workers */
1268                         if (udev_list_node_is_empty(&event_list)) {
1269                                 log_debug("cleanup idle workers\n");
1270                                 worker_kill(udev);
1271                         }
1272
1273                         /* check for hanging events */
1274                         udev_list_node_foreach(loop, &worker_list) {
1275                                 struct worker *worker = node_to_worker(loop);
1276
1277                                 if (worker->state != WORKER_RUNNING)
1278                                         continue;
1279
1280                                 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
1281                                         log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1282                                             worker->event ? worker->event->devpath : "<idle>");
1283                                         kill(worker->pid, SIGKILL);
1284                                         worker->state = WORKER_KILLED;
1285                                         /* drop reference taken for state 'running' */
1286                                         worker_unref(worker);
1287                                         if (worker->event) {
1288                                                 log_error("seq %llu '%s' killed\n",
1289                                                           udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1290                                                 worker->event->exitcode = -64;
1291                                                 event_queue_delete(worker->event, true);
1292                                                 worker->event = NULL;
1293                                         }
1294                                 }
1295                         }
1296
1297                 }
1298
1299                 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1300                 for (i = 0; i < fdcount; i++) {
1301                         if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1302                                 is_worker = true;
1303                         else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1304                                 is_netlink = true;
1305                         else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1306                                 is_signal = true;
1307                         else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1308                                 is_inotify = true;
1309                         else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1310                                 is_ctrl = true;
1311                 }
1312
1313                 /* check for changed config, every 3 seconds at most */
1314                 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
1315                         if (udev_rules_check_timestamp(rules))
1316                                 reload = true;
1317                         if (udev_builtin_validate(udev))
1318                                 reload = true;
1319
1320                         last_usec = now(CLOCK_MONOTONIC);
1321                 }
1322
1323                 /* reload requested, HUP signal received, rules changed, builtin changed */
1324                 if (reload) {
1325                         worker_kill(udev);
1326                         rules = udev_rules_unref(rules);
1327                         udev_builtin_exit(udev);
1328                         reload = false;
1329                 }
1330
1331                 /* event has finished */
1332                 if (is_worker)
1333                         worker_returned(fd_worker);
1334
1335                 if (is_netlink) {
1336                         struct udev_device *dev;
1337
1338                         dev = udev_monitor_receive_device(monitor);
1339                         if (dev != NULL) {
1340                                 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1341                                 if (event_queue_insert(dev) < 0)
1342                                         udev_device_unref(dev);
1343                         }
1344                 }
1345
1346                 /* start new events */
1347                 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1348                         udev_builtin_init(udev);
1349                         if (rules == NULL)
1350                                 rules = udev_rules_new(udev, resolve_names);
1351                         if (rules != NULL)
1352                                 event_queue_start(udev);
1353                 }
1354
1355                 if (is_signal) {
1356                         struct signalfd_siginfo fdsi;
1357                         ssize_t size;
1358
1359                         size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1360                         if (size == sizeof(struct signalfd_siginfo))
1361                                 handle_signal(udev, fdsi.ssi_signo);
1362                 }
1363
1364                 /* we are shutting down, the events below are not handled anymore */
1365                 if (udev_exit)
1366                         continue;
1367
1368                 /* device node watch */
1369                 if (is_inotify)
1370                         handle_inotify(udev);
1371
1372                 /*
1373                  * This needs to be after the inotify handling, to make sure,
1374                  * that the ping is send back after the possibly generated
1375                  * "change" events by the inotify device node watch.
1376                  *
1377                  * A single time we may receive a client connection which we need to
1378                  * keep open to block the client. It will be closed right before we
1379                  * exit.
1380                  */
1381                 if (is_ctrl)
1382                         ctrl_conn = handle_ctrl_msg(udev_ctrl);
1383         }
1384
1385         rc = EXIT_SUCCESS;
1386 exit:
1387         udev_queue_export_cleanup(udev_queue_export);
1388         udev_ctrl_cleanup(udev_ctrl);
1389 exit_daemonize:
1390         if (fd_ep >= 0)
1391                 close(fd_ep);
1392         worker_list_cleanup(udev);
1393         event_queue_cleanup(udev, EVENT_UNDEF);
1394         udev_rules_unref(rules);
1395         udev_builtin_exit(udev);
1396         if (fd_signal >= 0)
1397                 close(fd_signal);
1398         if (worker_watch[READ_END] >= 0)
1399                 close(worker_watch[READ_END]);
1400         if (worker_watch[WRITE_END] >= 0)
1401                 close(worker_watch[WRITE_END]);
1402         udev_monitor_unref(monitor);
1403         udev_queue_export_unref(udev_queue_export);
1404         udev_ctrl_connection_unref(ctrl_conn);
1405         udev_ctrl_unref(udev_ctrl);
1406         label_finish();
1407         udev_unref(udev);
1408         log_close();
1409         return rc;
1410 }