2 * Copyright (C) 2004-2009 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
4 * Copyright (C) 2009 Canonical Ltd.
5 * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
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.
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.
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/>.
34 #include <sys/prctl.h>
35 #include <sys/socket.h>
36 #include <sys/signalfd.h>
37 #include <sys/select.h>
41 #include <sys/ioctl.h>
42 #include <sys/inotify.h>
46 #define UDEVD_PRIORITY -4
47 #define UDEV_PRIORITY -2
51 static void log_fn(struct udev *udev, int priority,
52 const char *file, int line, const char *fn,
53 const char *format, va_list args)
56 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
57 vfprintf(stderr, format, args);
59 vsyslog(priority, format, args);
63 static bool debug_trace;
64 static struct udev_rules *rules;
65 static struct udev_queue_export *udev_queue_export;
66 static struct udev_ctrl *udev_ctrl;
67 static struct udev_monitor *monitor;
68 static int worker_watch[2];
69 static pid_t settle_pid;
70 static bool stop_exec_queue;
71 static bool reload_config;
72 static int max_childs;
74 static struct udev_list_node event_list;
75 static struct udev_list_node worker_list;
76 static bool udev_exit;
77 static volatile sig_atomic_t worker_exit;
87 static struct pollfd pfd[] = {
88 [FD_NETLINK] = { .events = POLLIN },
89 [FD_WORKER] = { .events = POLLIN },
90 [FD_SIGNAL] = { .events = POLLIN },
91 [FD_INOTIFY] = { .events = POLLIN },
92 [FD_CONTROL] = { .events = POLLIN },
102 struct udev_list_node node;
104 struct udev_device *dev;
105 enum event_state state;
107 unsigned long long int delaying_seqnum;
108 unsigned long long int seqnum;
111 const char *devpath_old;
114 static struct event *node_to_event(struct udev_list_node *node)
118 event = (char *)node;
119 event -= offsetof(struct event, node);
120 return (struct event *)event;
131 struct udev_list_node node;
135 struct udev_monitor *monitor;
136 enum worker_state state;
140 /* passed from worker to main process */
141 struct worker_message {
146 static struct worker *node_to_worker(struct udev_list_node *node)
150 worker = (char *)node;
151 worker -= offsetof(struct worker, node);
152 return (struct worker *)worker;
155 static void event_queue_delete(struct event *event)
157 udev_list_node_remove(&event->node);
159 /* mark as failed, if "add" event returns non-zero */
160 if (event->exitcode && strcmp(udev_device_get_action(event->dev), "add") == 0)
161 udev_queue_export_device_failed(udev_queue_export, event->dev);
163 udev_queue_export_device_finished(udev_queue_export, event->dev);
165 info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
166 udev_device_unref(event->dev);
170 static void event_sig_handler(int signum)
182 static struct worker *worker_ref(struct worker *worker)
188 static void worker_unref(struct worker *worker)
191 if (worker->refcount > 0)
194 udev_list_node_remove(&worker->node);
195 udev_monitor_unref(worker->monitor);
197 info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
201 static void worker_new(struct event *event)
203 struct worker *worker;
204 struct udev_monitor *worker_monitor;
206 struct sigaction act;
208 /* listen for new events */
209 worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
210 if (worker_monitor == NULL)
212 /* allow the main daemon netlink address to send devices to the worker */
213 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
214 udev_monitor_enable_receiving(worker_monitor);
215 util_set_fd_cloexec(udev_monitor_get_fd(worker_monitor));
217 worker = calloc(1, sizeof(struct worker));
220 /* worker + event reference */
221 worker->refcount = 2;
222 worker->udev = event->udev;
228 struct udev_device *dev;
229 struct pollfd pmon = {
230 .fd = udev_monitor_get_fd(worker_monitor),
234 udev_queue_export_unref(udev_queue_export);
235 udev_monitor_unref(monitor);
236 udev_ctrl_unref(udev_ctrl);
237 close(pfd[FD_SIGNAL].fd);
238 close(worker_watch[READ_END]);
240 udev_log_init("udevd-work");
241 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
243 /* set signal handlers */
244 memset(&act, 0x00, sizeof(act));
245 act.sa_handler = event_sig_handler;
246 sigemptyset (&act.sa_mask);
248 sigaction(SIGTERM, &act, NULL);
249 sigaction(SIGALRM, &act, NULL);
251 /* unblock SIGALRM */
252 sigfillset(&sigmask);
253 sigdelset(&sigmask, SIGALRM);
254 sigprocmask(SIG_SETMASK, &sigmask, NULL);
255 /* SIGTERM is unblocked in ppoll() */
256 sigdelset(&sigmask, SIGTERM);
258 /* request TERM signal if parent exits */
259 prctl(PR_SET_PDEATHSIG, SIGTERM);
265 struct udev_event *udev_event;
266 struct worker_message msg;
269 udev_event = udev_event_new(dev);
270 if (udev_event == NULL)
273 /* set timeout to prevent hanging processes */
274 alarm(UDEV_EVENT_TIMEOUT);
276 /* apply rules, create node, symlinks */
277 err = udev_event_execute_rules(udev_event, rules);
279 /* rules may change/disable the timeout */
280 if (udev_device_get_event_timeout(dev) >= 0)
281 alarm(udev_device_get_event_timeout(dev));
284 if (err == 0 && !udev_event->ignore_device && udev_get_run(udev_event->udev))
285 udev_event_execute_run(udev_event);
290 /* apply/restore inotify watch */
291 if (err == 0 && udev_event->inotify_watch) {
292 udev_watch_begin(udev_event->udev, dev);
293 udev_device_update_db(dev);
296 /* send processed event back to libudev listeners */
297 udev_monitor_send_device(worker_monitor, NULL, dev);
299 /* send back the result of the event execution */
302 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
304 info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
305 udev_event_unref(udev_event);
306 udev_device_unref(dev);
309 /* wait for more device messages or signal from udevd */
310 while (!worker_exit) {
313 fdcount = ppoll(&pmon, 1, NULL, &sigmask);
317 if (pmon.revents & POLLIN) {
318 dev = udev_monitor_receive_device(worker_monitor);
323 } while (dev != NULL);
325 udev_monitor_unref(worker_monitor);
330 udev_monitor_unref(worker_monitor);
331 event->state = EVENT_QUEUED;
333 err(event->udev, "fork of child failed: %m\n");
336 /* close monitor, but keep address around */
337 udev_monitor_disconnect(worker_monitor);
338 worker->monitor = worker_monitor;
340 worker->state = WORKER_RUNNING;
341 worker->event = event;
342 event->state = EVENT_RUNNING;
343 udev_list_node_append(&worker->node, &worker_list);
345 info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
350 static void event_run(struct event *event)
352 struct udev_list_node *loop;
354 udev_list_node_foreach(loop, &worker_list) {
355 struct worker *worker = node_to_worker(loop);
358 if (worker->state != WORKER_IDLE)
361 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
363 err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
364 kill(worker->pid, SIGKILL);
365 worker->state = WORKER_KILLED;
369 worker->event = event;
370 worker->state = WORKER_RUNNING;
371 event->state = EVENT_RUNNING;
375 if (childs >= max_childs) {
376 info(event->udev, "maximum number (%i) of childs reached\n", childs);
380 /* start new worker and pass initial device */
384 static void event_queue_insert(struct udev_device *dev)
388 event = calloc(1, sizeof(struct event));
392 event->udev = udev_device_get_udev(dev);
394 event->seqnum = udev_device_get_seqnum(dev);
395 event->devpath = udev_device_get_devpath(dev);
396 event->devpath_len = strlen(event->devpath);
397 event->devpath_old = udev_device_get_devpath_old(dev);
399 udev_queue_export_device_queued(udev_queue_export, dev);
400 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
401 udev_device_get_action(dev), udev_device_get_subsystem(dev));
403 event->state = EVENT_QUEUED;
404 udev_list_node_append(&event->node, &event_list);
406 /* run all events with a timeout set immediately */
407 if (udev_device_get_timeout(dev) > 0) {
413 static void worker_kill(struct udev *udev, int retain)
415 struct udev_list_node *loop;
418 if (childs <= retain)
421 max = childs - retain;
423 udev_list_node_foreach(loop, &worker_list) {
424 struct worker *worker = node_to_worker(loop);
429 if (worker->state == WORKER_KILLED)
432 worker->state = WORKER_KILLED;
433 kill(worker->pid, SIGTERM);
437 static int mem_size_mb(void)
441 long int memsize = -1;
443 f = fopen("/proc/meminfo", "r");
447 while (fgets(buf, sizeof(buf), f) != NULL) {
450 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
451 memsize = value / 1024;
460 /* lookup event for identical, parent, child device */
461 static int devpath_busy(struct event *event)
463 struct udev_list_node *loop;
466 /* check if queue contains events we depend on */
467 udev_list_node_foreach(loop, &event_list) {
468 struct event *loop_event = node_to_event(loop);
470 /* we already found a later event, earlier can not block us, no need to check again */
471 if (loop_event->seqnum < event->delaying_seqnum)
474 /* event we checked earlier still exists, no need to check again */
475 if (loop_event->seqnum == event->delaying_seqnum)
478 /* found ourself, no later event can block us */
479 if (loop_event->seqnum >= event->seqnum)
482 /* check our old name */
483 if (event->devpath_old != NULL)
484 if (strcmp(loop_event->devpath, event->devpath_old) == 0) {
485 event->delaying_seqnum = loop_event->seqnum;
489 /* compare devpath */
490 common = MIN(loop_event->devpath_len, event->devpath_len);
492 /* one devpath is contained in the other? */
493 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
496 /* identical device event found */
497 if (loop_event->devpath_len == event->devpath_len) {
498 event->delaying_seqnum = loop_event->seqnum;
502 /* parent device event found */
503 if (event->devpath[common] == '/') {
504 event->delaying_seqnum = loop_event->seqnum;
508 /* child device event found */
509 if (loop_event->devpath[common] == '/') {
510 event->delaying_seqnum = loop_event->seqnum;
514 /* no matching device */
521 static void events_start(struct udev *udev)
523 struct udev_list_node *loop;
525 udev_list_node_foreach(loop, &event_list) {
526 struct event *event = node_to_event(loop);
528 if (event->state != EVENT_QUEUED)
531 /* do not start event if parent or child event is still running */
532 if (devpath_busy(event) != 0) {
533 dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
541 static void worker_returned(void)
544 struct worker_message msg;
546 struct udev_list_node *loop;
548 size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
549 if (size != sizeof(struct worker_message))
552 /* lookup worker who sent the signal */
553 udev_list_node_foreach(loop, &worker_list) {
554 struct worker *worker = node_to_worker(loop);
556 if (worker->pid != msg.pid)
559 /* worker returned */
560 worker->event->exitcode = msg.exitcode;
561 event_queue_delete(worker->event);
562 worker->event = NULL;
563 if (worker->state != WORKER_KILLED)
564 worker->state = WORKER_IDLE;
565 worker_unref(worker);
571 /* receive the udevd message from userspace */
572 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
574 struct udev *udev = udev_ctrl_get_udev(uctrl);
575 struct udev_ctrl_msg *ctrl_msg;
579 ctrl_msg = udev_ctrl_receive_msg(uctrl);
580 if (ctrl_msg == NULL)
583 i = udev_ctrl_get_set_log_level(ctrl_msg);
585 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
586 udev_set_log_priority(udev, i);
587 worker_kill(udev, 0);
590 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
591 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
592 stop_exec_queue = true;
595 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
596 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
597 stop_exec_queue = false;
600 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
601 info(udev, "udevd message (RELOAD_RULES) received\n");
602 reload_config = true;
605 str = udev_ctrl_get_set_env(ctrl_msg);
613 val = strchr(key, '=');
617 if (val[0] == '\0') {
618 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
619 udev_add_property(udev, key, NULL);
621 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
622 udev_add_property(udev, key, val);
625 err(udev, "wrong key format '%s'\n", key);
629 worker_kill(udev, 0);
632 i = udev_ctrl_get_set_max_childs(ctrl_msg);
634 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
638 settle_pid = udev_ctrl_get_settle(ctrl_msg);
639 if (settle_pid > 0) {
640 info(udev, "udevd message (SETTLE) received\n");
641 kill(settle_pid, SIGUSR1);
644 udev_ctrl_msg_unref(ctrl_msg);
647 /* read inotify messages */
648 static int handle_inotify(struct udev *udev)
652 struct inotify_event *ev;
654 if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
657 buf = malloc(nbytes);
659 err(udev, "error getting buffer for inotify\n");
663 nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
665 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
666 struct udev_device *dev;
668 ev = (struct inotify_event *)(buf + pos);
670 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
671 reload_config = true;
675 dev = udev_watch_lookup(udev, ev->wd);
677 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
678 if (ev->mask & IN_CLOSE_WRITE) {
679 char filename[UTIL_PATH_SIZE];
682 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
683 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
684 fd = open(filename, O_WRONLY);
685 if (fd < 0 || write(fd, "change", 6) < 0)
686 info(udev, "error writing uevent: %m\n");
689 if (ev->mask & IN_IGNORED)
690 udev_watch_end(udev, dev);
692 udev_device_unref(dev);
701 static void handle_signal(struct udev *udev, int signo)
712 struct udev_list_node *loop, *tmp;
714 pid = waitpid(-1, &status, WNOHANG);
718 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
719 struct worker *worker = node_to_worker(loop);
721 if (worker->pid != pid)
724 info(udev, "worker [%u] exit\n", pid);
725 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
726 err(udev, "worker [%u] unexpectedly returned with status 0x%04x\n", pid, status);
727 if (worker->event != NULL) {
728 err(udev, "worker [%u] failed while handling '%s'\n", pid, worker->event->devpath);
729 worker->event->exitcode = -32;
730 event_queue_delete(worker->event);
731 /* drop reference from running event */
732 worker_unref(worker);
735 worker_unref(worker);
741 reload_config = true;
746 static void startup_log(struct udev *udev)
749 char path[UTIL_PATH_SIZE];
752 f = fopen("/dev/kmsg", "w");
754 fprintf(f, "<6>udev: starting version " VERSION "\n");
756 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/class/mem/null", NULL);
757 if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
758 const char *depr_str =
759 "udev: missing sysfs features; please update the kernel "
760 "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
761 "udev may fail to work correctly";
764 fprintf(f, "<3>%s\n", depr_str);
765 err(udev, "%s\n", depr_str);
773 int main(int argc, char *argv[])
779 int daemonize = false;
780 int resolve_names = 1;
781 static const struct option options[] = {
782 { "daemon", no_argument, NULL, 'd' },
783 { "debug-trace", no_argument, NULL, 't' },
784 { "debug", no_argument, NULL, 'D' },
785 { "help", no_argument, NULL, 'h' },
786 { "version", no_argument, NULL, 'V' },
787 { "resolve-names", required_argument, NULL, 'N' },
796 udev_log_init("udevd");
797 udev_set_log_fn(udev, log_fn);
798 info(udev, "version %s\n", VERSION);
799 udev_selinux_init(udev);
804 option = getopt_long(argc, argv, "dDthV", options, NULL);
817 if (udev_get_log_priority(udev) < LOG_INFO)
818 udev_set_log_priority(udev, LOG_INFO);
821 if (strcmp (optarg, "early") == 0) {
823 } else if (strcmp (optarg, "late") == 0) {
825 } else if (strcmp (optarg, "never") == 0) {
828 fprintf(stderr, "resolve-names must be early, late or never\n");
829 err(udev, "resolve-names must be early, late or never\n");
834 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
835 "[--resolve-names=early|late|never] [--version]\n");
838 printf("%s\n", VERSION);
846 fprintf(stderr, "root privileges required\n");
847 err(udev, "root privileges required\n");
851 /* make sure std{in,out,err} fd's are in a sane state */
852 fd = open("/dev/null", O_RDWR);
854 fprintf(stderr, "cannot open /dev/null\n");
855 err(udev, "cannot open /dev/null\n");
857 if (write(STDOUT_FILENO, 0, 0) < 0)
858 dup2(fd, STDOUT_FILENO);
859 if (write(STDERR_FILENO, 0, 0) < 0)
860 dup2(fd, STDERR_FILENO);
862 /* init control socket, bind() ensures, that only one udevd instance is running */
863 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
864 if (udev_ctrl == NULL) {
865 fprintf(stderr, "error initializing control socket");
866 err(udev, "error initializing udevd socket");
870 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
871 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
872 err(udev, "error binding control socket, seems udevd is already running\n");
876 pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
878 monitor = udev_monitor_new_from_netlink(udev, "kernel");
879 if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
880 fprintf(stderr, "error initializing netlink socket\n");
881 err(udev, "error initializing netlink socket\n");
885 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
886 pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
888 pfd[FD_INOTIFY].fd = udev_watch_init(udev);
889 if (pfd[FD_INOTIFY].fd < 0) {
890 fprintf(stderr, "error initializing inotify\n");
891 err(udev, "error initializing inotify\n");
896 if (udev_get_rules_path(udev) != NULL) {
897 inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
898 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
900 char filename[UTIL_PATH_SIZE];
902 inotify_add_watch(pfd[FD_INOTIFY].fd, LIBEXECDIR "/rules.d",
903 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
904 inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
905 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
907 /* watch dynamic rules directory */
908 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
909 inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
910 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
912 udev_watch_restore(udev);
914 /* block and listen to all signals on signalfd */
916 sigprocmask(SIG_SETMASK, &mask, NULL);
917 pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
918 if (pfd[FD_SIGNAL].fd < 0) {
919 fprintf(stderr, "error getting signalfd\n");
920 err(udev, "error getting signalfd\n");
925 /* unnamed socket from workers to the main daemon */
926 if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, worker_watch) < 0) {
927 fprintf(stderr, "error getting socketpair\n");
928 err(udev, "error getting socketpair\n");
932 pfd[FD_WORKER].fd = worker_watch[READ_END];
933 util_set_fd_cloexec(worker_watch[WRITE_END]);
935 rules = udev_rules_new(udev, resolve_names);
937 err(udev, "error reading rules\n");
941 udev_queue_export = udev_queue_export_new(udev);
942 if (udev_queue_export == NULL) {
943 err(udev, "error creating queue file\n");
955 err(udev, "fork of daemon failed: %m\n");
966 /* redirect std{out,err} */
967 if (!debug && !debug_trace) {
968 dup2(fd, STDIN_FILENO);
969 dup2(fd, STDOUT_FILENO);
970 dup2(fd, STDERR_FILENO);
972 if (fd > STDERR_FILENO)
975 /* set scheduling priority for the daemon */
976 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
982 /* OOM_DISABLE == -17 */
983 fd = open("/proc/self/oom_adj", O_RDWR);
985 err(udev, "error disabling OOM: %m\n");
991 /* in trace mode run one event after the other */
995 int memsize = mem_size_mb();
998 max_childs = 128 + (memsize / 8);
1003 /* possibly overwrite maximum limit of executed events */
1004 value = getenv("UDEVD_MAX_CHILDS");
1006 max_childs = strtoul(value, NULL, 10);
1007 info(udev, "initialize max_childs to %u\n", max_childs);
1009 udev_list_init(&event_list);
1010 udev_list_init(&worker_list);
1012 while (!udev_exit) {
1016 /* set timeout to kill idle workers */
1017 if (udev_list_is_empty(&event_list) && childs > 2)
1021 /* wait for events */
1022 fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
1026 /* timeout - kill idle workers */
1028 worker_kill(udev, 2);
1030 /* event has finished */
1031 if (pfd[FD_WORKER].revents & POLLIN)
1034 /* get kernel uevent */
1035 if (pfd[FD_NETLINK].revents & POLLIN) {
1036 struct udev_device *dev;
1038 dev = udev_monitor_receive_device(monitor);
1040 event_queue_insert(dev);
1042 udev_device_unref(dev);
1045 /* start new events */
1046 if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
1050 if (pfd[FD_SIGNAL].revents & POLLIN) {
1051 struct signalfd_siginfo fdsi;
1054 size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
1055 if (size == sizeof(struct signalfd_siginfo))
1056 handle_signal(udev, fdsi.ssi_signo);
1059 /* device node and rules directory inotify watch */
1060 if (pfd[FD_INOTIFY].revents & POLLIN)
1061 handle_inotify(udev);
1064 * get control message
1066 * This needs to be after the inotify handling, to make sure,
1067 * that the settle signal is send back after the possibly generated
1068 * "change" events by the inotify device node watch.
1070 if (pfd[FD_CONTROL].revents & POLLIN)
1071 handle_ctrl_msg(udev_ctrl);
1073 /* rules changed, set by inotify or a HUP signal */
1074 if (reload_config) {
1075 struct udev_rules *rules_new;
1077 worker_kill(udev, 0);
1078 rules_new = udev_rules_new(udev, resolve_names);
1079 if (rules_new != NULL) {
1080 udev_rules_unref(rules);
1087 udev_queue_export_cleanup(udev_queue_export);
1090 udev_queue_export_unref(udev_queue_export);
1091 udev_rules_unref(rules);
1092 udev_ctrl_unref(udev_ctrl);
1093 if (pfd[FD_SIGNAL].fd >= 0)
1094 close(pfd[FD_SIGNAL].fd);
1095 if (worker_watch[READ_END] >= 0)
1096 close(worker_watch[READ_END]);
1097 if (worker_watch[WRITE_END] >= 0)
1098 close(worker_watch[WRITE_END]);
1099 udev_monitor_unref(monitor);
1100 udev_selinux_exit(udev);