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 void static_dev_create_from_modules(struct udev *udev)
 816 {
 817         struct utsname kernel;
 818         char modules[UTIL_PATH_SIZE];
 819         char buf[4096];
 820         FILE *f;
 821
 822         if (uname(&kernel) < 0) {
 823                 log_error("uname failed: %m");
 824                 return;
 825         }
 826
 827         strscpyl(modules, sizeof(modules), ROOTPREFIX "/lib/modules/", kernel.release, "/modules.devname", NULL);
 828         f = fopen(modules, "re");
 829         if (f == NULL)
 830                 return;
 831
 832         while (fgets(buf, sizeof(buf), f) != NULL) {
 833                 char *s;
 834                 const char *modname;
 835                 const char *devname;
 836                 const char *devno;
 837                 int maj, min;
 838                 char type;
 839                 mode_t mode;
 840                 char filename[UTIL_PATH_SIZE];
 841
 842                 if (buf[0] == '#')
 843                         continue;
 844
 845                 modname = buf;
 846                 s = strchr(modname, ' ');
 847                 if (s == NULL)
 848                         continue;
 849                 s[0] = '\0';
 850
 851                 devname = &s[1];
 852                 s = strchr(devname, ' ');
 853                 if (s == NULL)
 854                         continue;
 855                 s[0] = '\0';
 856
 857                 devno = &s[1];
 858                 s = strchr(devno, ' ');
 859                 if (s == NULL)
 860                         s = strchr(devno, '\n');
 861                 if (s != NULL)
 862                         s[0] = '\0';
 863                 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
 864                         continue;
 865
 866                 mode  = 0600;
 867                 if (type == 'c')
 868                         mode |= S_IFCHR;
 869                 else if (type == 'b')
 870                         mode |= S_IFBLK;
 871                 else
 872                         continue;
 873
 874                 strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
 875                 mkdir_parents_label(filename, 0755);
 876                 label_context_set(filename, mode);
 877                 log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
 878                 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
 879                         utimensat(AT_FDCWD, filename, NULL, 0);
 880                 label_context_clear();
 881         }
 882
 883         fclose(f);
 884 }
 885
 886 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
 887 {
 888         int ctrl = -1, netlink = -1;
 889         int fd, n;
 890
 891         n = sd_listen_fds(true);
 892         if (n <= 0)
 893                 return -1;
 894
 895         for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
 896                 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
 897                         if (ctrl >= 0)
 898                                 return -1;
 899                         ctrl = fd;
 900                         continue;
 901                 }
 902
 903                 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
 904                         if (netlink >= 0)
 905                                 return -1;
 906                         netlink = fd;
 907                         continue;
 908                 }
 909
 910                 return -1;
 911         }
 912
 913         if (ctrl < 0 || netlink < 0)
 914                 return -1;
 915
 916         log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
 917         *rctrl = ctrl;
 918         *rnetlink = netlink;
 919         return 0;
 920 }
 921
 922 /*
 923  * read the kernel commandline, in case we need to get into debug mode
 924  *   udev.log-priority=<level>              syslog priority
 925  *   udev.children-max=<number of workers>  events are fully serialized if set to 1
 926  *   udev.exec-delay=<number of seconds>    delay execution of every executed program
 927  */
 928 static void kernel_cmdline_options(struct udev *udev)
 929 {
 930         char *line, *w, *state;
 931         size_t l;
 932
 933         if (read_one_line_file("/proc/cmdline", &line) < 0)
 934                 return;
 935
 936         FOREACH_WORD_QUOTED(w, l, line, state) {
 937                 char *s, *opt;
 938
 939                 s = strndup(w, l);
 940                 if (!s)
 941                         break;
 942
 943                 /* accept the same options for the initrd, prefixed with "rd." */
 944                 if (in_initrd() && startswith(s, "rd."))
 945                         opt = s + 3;
 946                 else
 947                         opt = s;
 948
 949                 if (startswith(opt, "udev.log-priority=")) {
 950                         int prio;
 951
 952                         prio = util_log_priority(opt + 18);
 953                         log_set_max_level(prio);
 954                         udev_set_log_priority(udev, prio);
 955                 } else if (startswith(opt, "udev.children-max=")) {
 956                         children_max = strtoul(opt + 18, NULL, 0);
 957                 } else if (startswith(opt, "udev.exec-delay=")) {
 958                         exec_delay = strtoul(opt + 16, NULL, 0);
 959                 }
 960
 961                 free(s);
 962         }
 963
 964         free(line);
 965 }
 966
 967 int main(int argc, char *argv[])
 968 {
 969         struct udev *udev;
 970         sigset_t mask;
 971         int daemonize = false;
 972         int resolve_names = 1;
 973         static const struct option options[] = {
 974                 { "daemon", no_argument, NULL, 'd' },
 975                 { "debug", no_argument, NULL, 'D' },
 976                 { "children-max", required_argument, NULL, 'c' },
 977                 { "exec-delay", required_argument, NULL, 'e' },
 978                 { "resolve-names", required_argument, NULL, 'N' },
 979                 { "help", no_argument, NULL, 'h' },
 980                 { "version", no_argument, NULL, 'V' },
 981                 {}
 982         };
 983         int fd_ctrl = -1;
 984         int fd_netlink = -1;
 985         int fd_worker = -1;
 986         struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
 987         struct udev_ctrl_connection *ctrl_conn = NULL;
 988         int rc = 1;
 989
 990         udev = udev_new();
 991         if (udev == NULL)
 992                 goto exit;
 993
 994         log_set_target(LOG_TARGET_AUTO);
 995         log_parse_environment();
 996         log_open();
 997         udev_set_log_fn(udev, udev_main_log);
 998         log_debug("version %s\n", VERSION);
 999         label_init("/dev");
1000
1001         for (;;) {
1002                 int option;
1003
1004                 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1005                 if (option == -1)
1006                         break;
1007
1008                 switch (option) {
1009                 case 'd':
1010                         daemonize = true;
1011                         break;
1012                 case 'c':
1013                         children_max = strtoul(optarg, NULL, 0);
1014                         break;
1015                 case 'e':
1016                         exec_delay = strtoul(optarg, NULL, 0);
1017                         break;
1018                 case 'D':
1019                         debug = true;
1020                         log_set_max_level(LOG_DEBUG);
1021                         udev_set_log_priority(udev, LOG_DEBUG);
1022                         break;
1023                 case 'N':
1024                         if (streq(optarg, "early")) {
1025                                 resolve_names = 1;
1026                         } else if (streq(optarg, "late")) {
1027                                 resolve_names = 0;
1028                         } else if (streq(optarg, "never")) {
1029                                 resolve_names = -1;
1030                         } else {
1031                                 fprintf(stderr, "resolve-names must be early, late or never\n");
1032                                 log_error("resolve-names must be early, late or never\n");
1033                                 goto exit;
1034                         }
1035                         break;
1036                 case 'h':
1037                         printf("Usage: udevd OPTIONS\n"
1038                                "  --daemon\n"
1039                                "  --debug\n"
1040                                "  --children-max=<maximum number of workers>\n"
1041                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
1042                                "  --resolve-names=early|late|never\n"
1043                                "  --version\n"
1044                                "  --help\n"
1045                                "\n");
1046                         goto exit;
1047                 case 'V':
1048                         printf("%s\n", VERSION);
1049                         goto exit;
1050                 default:
1051                         goto exit;
1052                 }
1053         }
1054
1055         kernel_cmdline_options(udev);
1056
1057         if (getuid() != 0) {
1058                 fprintf(stderr, "root privileges required\n");
1059                 log_error("root privileges required\n");
1060                 goto exit;
1061         }
1062
1063         /* set umask before creating any file/directory */
1064         chdir("/");
1065         umask(022);
1066
1067         mkdir("/run/udev", 0755);
1068
1069         dev_setup(NULL);
1070         static_dev_create_from_modules(udev);
1071
1072         /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1073         if (daemonize) {
1074                 int fd;
1075
1076                 fd = open("/dev/null", O_RDWR);
1077                 if (fd >= 0) {
1078                         if (write(STDOUT_FILENO, 0, 0) < 0)
1079                                 dup2(fd, STDOUT_FILENO);
1080                         if (write(STDERR_FILENO, 0, 0) < 0)
1081                                 dup2(fd, STDERR_FILENO);
1082                         if (fd > STDERR_FILENO)
1083                                 close(fd);
1084                 } else {
1085                         fprintf(stderr, "cannot open /dev/null\n");
1086                         log_error("cannot open /dev/null\n");
1087                 }
1088         }
1089
1090         if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1091                 /* get control and netlink socket from systemd */
1092                 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1093                 if (udev_ctrl == NULL) {
1094                         log_error("error taking over udev control socket");
1095                         rc = 1;
1096                         goto exit;
1097                 }
1098
1099                 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1100                 if (monitor == NULL) {
1101                         log_error("error taking over netlink socket\n");
1102                         rc = 3;
1103                         goto exit;
1104                 }
1105
1106                 /* get our own cgroup, we regularly kill everything udev has left behind */
1107                 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1108                         udev_cgroup = NULL;
1109         } else {
1110                 /* open control and netlink socket */
1111                 udev_ctrl = udev_ctrl_new(udev);
1112                 if (udev_ctrl == NULL) {
1113                         fprintf(stderr, "error initializing udev control socket");
1114                         log_error("error initializing udev control socket");
1115                         rc = 1;
1116                         goto exit;
1117                 }
1118                 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1119
1120                 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1121                 if (monitor == NULL) {
1122                         fprintf(stderr, "error initializing netlink socket\n");
1123                         log_error("error initializing netlink socket\n");
1124                         rc = 3;
1125                         goto exit;
1126                 }
1127                 fd_netlink = udev_monitor_get_fd(monitor);
1128         }
1129
1130         if (udev_monitor_enable_receiving(monitor) < 0) {
1131                 fprintf(stderr, "error binding netlink socket\n");
1132                 log_error("error binding netlink socket\n");
1133                 rc = 3;
1134                 goto exit;
1135         }
1136
1137         if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1138                 fprintf(stderr, "error binding udev control socket\n");
1139                 log_error("error binding udev control socket\n");
1140                 rc = 1;
1141                 goto exit;
1142         }
1143
1144         udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1145
1146         /* create queue file before signalling 'ready', to make sure we block 'settle' */
1147         udev_queue_export = udev_queue_export_new(udev);
1148         if (udev_queue_export == NULL) {
1149                 log_error("error creating queue file\n");
1150                 goto exit;
1151         }
1152
1153         if (daemonize) {
1154                 pid_t pid;
1155
1156                 pid = fork();
1157                 switch (pid) {
1158                 case 0:
1159                         break;
1160                 case -1:
1161                         log_error("fork of daemon failed: %m\n");
1162                         rc = 4;
1163                         goto exit;
1164                 default:
1165                         rc = EXIT_SUCCESS;
1166                         goto exit_daemonize;
1167                 }
1168
1169                 setsid();
1170
1171                 write_string_file("/proc/self/oom_score_adj", "-1000");
1172         } else {
1173                 sd_notify(1, "READY=1");
1174         }
1175
1176         print_kmsg("starting version " VERSION "\n");
1177
1178         if (!debug) {
1179                 int fd;
1180
1181                 fd = open("/dev/null", O_RDWR);
1182                 if (fd >= 0) {
1183                         dup2(fd, STDIN_FILENO);
1184                         dup2(fd, STDOUT_FILENO);
1185                         dup2(fd, STDERR_FILENO);
1186                         close(fd);
1187                 }
1188         }
1189
1190         fd_inotify = udev_watch_init(udev);
1191         if (fd_inotify < 0) {
1192                 fprintf(stderr, "error initializing inotify\n");
1193                 log_error("error initializing inotify\n");
1194                 rc = 4;
1195                 goto exit;
1196         }
1197         udev_watch_restore(udev);
1198
1199         /* block and listen to all signals on signalfd */
1200         sigfillset(&mask);
1201         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1202         fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1203         if (fd_signal < 0) {
1204                 fprintf(stderr, "error creating signalfd\n");
1205                 log_error("error creating signalfd\n");
1206                 rc = 5;
1207                 goto exit;
1208         }
1209
1210         /* unnamed socket from workers to the main daemon */
1211         if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1212                 fprintf(stderr, "error creating socketpair\n");
1213                 log_error("error creating socketpair\n");
1214                 rc = 6;
1215                 goto exit;
1216         }
1217         fd_worker = worker_watch[READ_END];
1218
1219         udev_builtin_init(udev);
1220
1221         rules = udev_rules_new(udev, resolve_names);
1222         if (rules == NULL) {
1223                 log_error("error reading rules\n");
1224                 goto exit;
1225         }
1226
1227         memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1228         ep_ctrl.events = EPOLLIN;
1229         ep_ctrl.data.fd = fd_ctrl;
1230
1231         memset(&ep_inotify, 0, sizeof(struct epoll_event));
1232         ep_inotify.events = EPOLLIN;
1233         ep_inotify.data.fd = fd_inotify;
1234
1235         memset(&ep_signal, 0, sizeof(struct epoll_event));
1236         ep_signal.events = EPOLLIN;
1237         ep_signal.data.fd = fd_signal;
1238
1239         memset(&ep_netlink, 0, sizeof(struct epoll_event));
1240         ep_netlink.events = EPOLLIN;
1241         ep_netlink.data.fd = fd_netlink;
1242
1243         memset(&ep_worker, 0, sizeof(struct epoll_event));
1244         ep_worker.events = EPOLLIN;
1245         ep_worker.data.fd = fd_worker;
1246
1247         fd_ep = epoll_create1(EPOLL_CLOEXEC);
1248         if (fd_ep < 0) {
1249                 log_error("error creating epoll fd: %m\n");
1250                 goto exit;
1251         }
1252         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1253             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1254             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1255             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1256             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1257                 log_error("fail to add fds to epoll: %m\n");
1258                 goto exit;
1259         }
1260
1261         if (children_max <= 0) {
1262                 cpu_set_t cpu_set;
1263
1264                 children_max = 8;
1265
1266                 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1267                         children_max +=  CPU_COUNT(&cpu_set) * 2;
1268                 }
1269         }
1270         log_debug("set children_max to %u\n", children_max);
1271
1272         udev_rules_apply_static_dev_perms(rules);
1273
1274         udev_list_node_init(&event_list);
1275         udev_list_node_init(&worker_list);
1276
1277         for (;;) {
1278                 static usec_t last_usec;
1279                 struct epoll_event ev[8];
1280                 int fdcount;
1281                 int timeout;
1282                 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1283                 int i;
1284
1285                 if (udev_exit) {
1286                         /* close sources of new events and discard buffered events */
1287                         if (fd_ctrl >= 0) {
1288                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1289                                 fd_ctrl = -1;
1290                         }
1291                         if (monitor != NULL) {
1292                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1293                                 udev_monitor_unref(monitor);
1294                                 monitor = NULL;
1295                         }
1296                         if (fd_inotify >= 0) {
1297                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1298                                 close(fd_inotify);
1299                                 fd_inotify = -1;
1300                         }
1301
1302                         /* discard queued events and kill workers */
1303                         event_queue_cleanup(udev, EVENT_QUEUED);
1304                         worker_kill(udev);
1305
1306                         /* exit after all has cleaned up */
1307                         if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1308                                 break;
1309
1310                         /* timeout at exit for workers to finish */
1311                         timeout = 30 * 1000;
1312                 } else if (udev_list_node_is_empty(&event_list) && !children) {
1313                         /* we are idle */
1314                         timeout = -1;
1315
1316                         /* cleanup possible left-over processes in our cgroup */
1317                         if (udev_cgroup)
1318                                 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1319                 } else {
1320                         /* kill idle or hanging workers */
1321                         timeout = 3 * 1000;
1322                 }
1323                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1324                 if (fdcount < 0)
1325                         continue;
1326
1327                 if (fdcount == 0) {
1328                         struct udev_list_node *loop;
1329
1330                         /* timeout */
1331                         if (udev_exit) {
1332                                 log_error("timeout, giving up waiting for workers to finish\n");
1333                                 break;
1334                         }
1335
1336                         /* kill idle workers */
1337                         if (udev_list_node_is_empty(&event_list)) {
1338                                 log_debug("cleanup idle workers\n");
1339                                 worker_kill(udev);
1340                         }
1341
1342                         /* check for hanging events */
1343                         udev_list_node_foreach(loop, &worker_list) {
1344                                 struct worker *worker = node_to_worker(loop);
1345
1346                                 if (worker->state != WORKER_RUNNING)
1347                                         continue;
1348
1349                                 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
1350                                         log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1351                                             worker->event ? worker->event->devpath : "<idle>");
1352                                         kill(worker->pid, SIGKILL);
1353                                         worker->state = WORKER_KILLED;
1354                                         /* drop reference taken for state 'running' */
1355                                         worker_unref(worker);
1356                                         if (worker->event) {
1357                                                 log_error("seq %llu '%s' killed\n",
1358                                                           udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1359                                                 worker->event->exitcode = -64;
1360                                                 event_queue_delete(worker->event, true);
1361                                                 worker->event = NULL;
1362                                         }
1363                                 }
1364                         }
1365
1366                 }
1367
1368                 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1369                 for (i = 0; i < fdcount; i++) {
1370                         if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1371                                 is_worker = true;
1372                         else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1373                                 is_netlink = true;
1374                         else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1375                                 is_signal = true;
1376                         else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1377                                 is_inotify = true;
1378                         else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1379                                 is_ctrl = true;
1380                 }
1381
1382                 /* check for changed config, every 3 seconds at most */
1383                 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
1384                         if (udev_rules_check_timestamp(rules))
1385                                 reload = true;
1386                         if (udev_builtin_validate(udev))
1387                                 reload = true;
1388
1389                         last_usec = now(CLOCK_MONOTONIC);
1390                 }
1391
1392                 /* reload requested, HUP signal received, rules changed, builtin changed */
1393                 if (reload) {
1394                         worker_kill(udev);
1395                         rules = udev_rules_unref(rules);
1396                         udev_builtin_exit(udev);
1397                         reload = false;
1398                 }
1399
1400                 /* event has finished */
1401                 if (is_worker)
1402                         worker_returned(fd_worker);
1403
1404                 if (is_netlink) {
1405                         struct udev_device *dev;
1406
1407                         dev = udev_monitor_receive_device(monitor);
1408                         if (dev != NULL) {
1409                                 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1410                                 if (event_queue_insert(dev) < 0)
1411                                         udev_device_unref(dev);
1412                         }
1413                 }
1414
1415                 /* start new events */
1416                 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1417                         udev_builtin_init(udev);
1418                         if (rules == NULL)
1419                                 rules = udev_rules_new(udev, resolve_names);
1420                         if (rules != NULL)
1421                                 event_queue_start(udev);
1422                 }
1423
1424                 if (is_signal) {
1425                         struct signalfd_siginfo fdsi;
1426                         ssize_t size;
1427
1428                         size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1429                         if (size == sizeof(struct signalfd_siginfo))
1430                                 handle_signal(udev, fdsi.ssi_signo);
1431                 }
1432
1433                 /* we are shutting down, the events below are not handled anymore */
1434                 if (udev_exit)
1435                         continue;
1436
1437                 /* device node watch */
1438                 if (is_inotify)
1439                         handle_inotify(udev);
1440
1441                 /*
1442                  * This needs to be after the inotify handling, to make sure,
1443                  * that the ping is send back after the possibly generated
1444                  * "change" events by the inotify device node watch.
1445                  *
1446                  * A single time we may receive a client connection which we need to
1447                  * keep open to block the client. It will be closed right before we
1448                  * exit.
1449                  */
1450                 if (is_ctrl)
1451                         ctrl_conn = handle_ctrl_msg(udev_ctrl);
1452         }
1453
1454         rc = EXIT_SUCCESS;
1455 exit:
1456         udev_queue_export_cleanup(udev_queue_export);
1457         udev_ctrl_cleanup(udev_ctrl);
1458 exit_daemonize:
1459         if (fd_ep >= 0)
1460                 close(fd_ep);
1461         worker_list_cleanup(udev);
1462         event_queue_cleanup(udev, EVENT_UNDEF);
1463         udev_rules_unref(rules);
1464         udev_builtin_exit(udev);
1465         if (fd_signal >= 0)
1466                 close(fd_signal);
1467         if (worker_watch[READ_END] >= 0)
1468                 close(worker_watch[READ_END]);
1469         if (worker_watch[WRITE_END] >= 0)
1470                 close(worker_watch[WRITE_END]);
1471         udev_monitor_unref(monitor);
1472         udev_queue_export_unref(udev_queue_export);
1473         udev_ctrl_connection_unref(ctrl_conn);
1474         udev_ctrl_unref(udev_ctrl);
1475         label_finish();
1476         udev_unref(udev);
1477         log_close();
1478         return rc;
1479 }