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/>.
33 #include <sys/prctl.h>
34 #include <sys/socket.h>
35 #include <sys/signalfd.h>
36 #include <sys/select.h>
40 #include <sys/ioctl.h>
41 #include <sys/inotify.h>
45 #define UDEVD_PRIORITY -4
46 #define UDEV_PRIORITY -2
50 static void log_fn(struct udev *udev, int priority,
51 const char *file, int line, const char *fn,
52 const char *format, va_list args)
55 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
56 vfprintf(stderr, format, args);
58 vsyslog(priority, format, args);
62 static int debug_trace;
63 static struct udev_rules *rules;
64 static struct udev_queue_export *udev_queue_export;
65 static struct udev_ctrl *udev_ctrl;
66 static struct udev_monitor *monitor;
67 static int worker_watch[2];
68 static pid_t settle_pid;
69 static int stop_exec_queue;
70 static int reload_config;
71 static int max_childs;
73 static struct udev_list_node event_list;
74 static struct udev_list_node worker_list;
76 static volatile sig_atomic_t worker_exit;
86 static struct pollfd pfd[] = {
87 [FD_NETLINK] = { .events = POLLIN },
88 [FD_WORKER] = { .events = POLLIN },
89 [FD_SIGNAL] = { .events = POLLIN },
90 [FD_INOTIFY] = { .events = POLLIN },
91 [FD_CONTROL] = { .events = POLLIN },
101 struct udev_list_node node;
103 struct udev_device *dev;
104 enum event_state state;
106 unsigned long long int delaying_seqnum;
107 unsigned long long int seqnum;
110 const char *devpath_old;
113 static struct event *node_to_event(struct udev_list_node *node)
117 event = (char *)node;
118 event -= offsetof(struct event, node);
119 return (struct event *)event;
130 struct udev_list_node node;
132 struct udev_monitor *monitor;
133 enum worker_state state;
137 /* passed from worker to main process */
138 struct worker_message {
143 static struct worker *node_to_worker(struct udev_list_node *node)
147 worker = (char *)node;
148 worker -= offsetof(struct worker, node);
149 return (struct worker *)worker;
152 static void event_queue_delete(struct event *event)
154 udev_list_node_remove(&event->node);
156 /* mark as failed, if "add" event returns non-zero */
157 if (event->exitcode && strcmp(udev_device_get_action(event->dev), "add") == 0)
158 udev_queue_export_device_failed(udev_queue_export, event->dev);
160 udev_queue_export_device_finished(udev_queue_export, event->dev);
162 info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
163 udev_device_unref(event->dev);
167 static void event_sig_handler(int signum)
179 static void worker_unref(struct worker *worker)
181 udev_monitor_unref(worker->monitor);
185 static void worker_new(struct event *event)
187 struct worker *worker;
188 struct udev_monitor *worker_monitor;
190 struct sigaction act;
192 /* listen for new events */
193 worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
194 if (worker_monitor == NULL)
196 /* allow the main daemon netlink address to send devices to the worker */
197 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
198 udev_monitor_enable_receiving(worker_monitor);
199 util_set_fd_cloexec(udev_monitor_get_fd(worker_monitor));
201 worker = calloc(1, sizeof(struct worker));
209 struct udev_device *dev;
211 udev_queue_export_unref(udev_queue_export);
212 udev_monitor_unref(monitor);
213 udev_ctrl_unref(udev_ctrl);
214 close(pfd[FD_SIGNAL].fd);
215 close(worker_watch[READ_END]);
217 udev_log_init("udevd-work");
218 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
220 /* set signal handlers */
221 memset(&act, 0x00, sizeof(act));
222 act.sa_handler = event_sig_handler;
223 sigemptyset (&act.sa_mask);
225 sigaction(SIGTERM, &act, NULL);
226 sigaction(SIGALRM, &act, NULL);
228 /* unblock signals */
230 sigdelset(&mask, SIGTERM);
231 sigdelset(&mask, SIGALRM);
232 sigprocmask(SIG_SETMASK, &mask, NULL);
234 /* request TERM signal if parent exits */
235 prctl(PR_SET_PDEATHSIG, SIGTERM);
240 while (!worker_exit) {
241 struct udev_event *udev_event;
242 struct worker_message msg;
245 udev_event = udev_event_new(dev);
246 if (udev_event == NULL)
249 /* set timeout to prevent hanging processes */
250 alarm(UDEV_EVENT_TIMEOUT);
252 /* apply rules, create node, symlinks */
253 err = udev_event_execute_rules(udev_event, rules);
255 /* rules may change/disable the timeout */
256 if (udev_device_get_event_timeout(dev) >= 0)
257 alarm(udev_device_get_event_timeout(dev));
260 if (err == 0 && !udev_event->ignore_device && udev_get_run(udev_event->udev))
261 udev_event_execute_run(udev_event);
266 /* apply/restore inotify watch */
267 if (err == 0 && udev_event->inotify_watch) {
268 udev_watch_begin(udev_event->udev, dev);
269 udev_device_update_db(dev);
272 /* send processed event back to libudev listeners */
273 udev_monitor_send_device(worker_monitor, NULL, dev);
275 info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
276 udev_device_unref(dev);
277 udev_event_unref(udev_event);
279 /* send back the result of the event execution */
282 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
284 /* wait for more device messages from udevd */
286 dev = udev_monitor_receive_device(worker_monitor);
287 while (!worker_exit && dev == NULL);
290 udev_monitor_unref(worker_monitor);
295 udev_monitor_unref(worker_monitor);
296 event->state = EVENT_QUEUED;
298 err(event->udev, "fork of child failed: %m\n");
301 /* close monitor, but keep address around */
302 udev_monitor_disconnect(worker_monitor);
303 worker->monitor = worker_monitor;
305 worker->state = WORKER_RUNNING;
306 worker->event = event;
307 event->state = EVENT_RUNNING;
308 udev_list_node_append(&worker->node, &worker_list);
310 info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
315 static void event_run(struct event *event)
317 struct udev_list_node *loop;
319 udev_list_node_foreach(loop, &worker_list) {
320 struct worker *worker = node_to_worker(loop);
323 if (worker->state != WORKER_IDLE)
326 worker->event = event;
327 worker->state = WORKER_RUNNING;
328 event->state = EVENT_RUNNING;
329 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
331 err(event->udev, "worker [%u] did not accept message, kill it\n", worker->pid);
332 event->state = EVENT_QUEUED;
333 worker->state = WORKER_KILLED;
334 kill(worker->pid, SIGKILL);
340 if (childs >= max_childs) {
341 info(event->udev, "maximum number (%i) of childs reached\n", childs);
345 /* start new worker and pass initial device */
349 static void event_queue_insert(struct udev_device *dev)
353 event = calloc(1, sizeof(struct event));
357 event->udev = udev_device_get_udev(dev);
359 event->seqnum = udev_device_get_seqnum(dev);
360 event->devpath = udev_device_get_devpath(dev);
361 event->devpath_len = strlen(event->devpath);
362 event->devpath_old = udev_device_get_devpath_old(dev);
364 udev_queue_export_device_queued(udev_queue_export, dev);
365 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
366 udev_device_get_action(dev), udev_device_get_subsystem(dev));
368 event->state = EVENT_QUEUED;
369 udev_list_node_append(&event->node, &event_list);
371 /* run all events with a timeout set immediately */
372 if (udev_device_get_timeout(dev) > 0) {
378 static void worker_kill(int retain)
380 struct udev_list_node *loop;
383 if (childs <= retain)
386 max = childs - retain;
388 udev_list_node_foreach(loop, &worker_list) {
389 struct worker *worker = node_to_worker(loop);
394 if (worker->state == WORKER_KILLED)
397 worker->state = WORKER_KILLED;
398 kill(worker->pid, SIGTERM);
402 static int mem_size_mb(void)
406 long int memsize = -1;
408 f = fopen("/proc/meminfo", "r");
412 while (fgets(buf, sizeof(buf), f) != NULL) {
415 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
416 memsize = value / 1024;
425 /* lookup event for identical, parent, child device */
426 static int devpath_busy(struct event *event)
428 struct udev_list_node *loop;
431 /* check if queue contains events we depend on */
432 udev_list_node_foreach(loop, &event_list) {
433 struct event *loop_event = node_to_event(loop);
435 /* we already found a later event, earlier can not block us, no need to check again */
436 if (loop_event->seqnum < event->delaying_seqnum)
439 /* event we checked earlier still exists, no need to check again */
440 if (loop_event->seqnum == event->delaying_seqnum)
443 /* found ourself, no later event can block us */
444 if (loop_event->seqnum >= event->seqnum)
447 /* check our old name */
448 if (event->devpath_old != NULL)
449 if (strcmp(loop_event->devpath, event->devpath_old) == 0) {
450 event->delaying_seqnum = loop_event->seqnum;
454 /* compare devpath */
455 common = MIN(loop_event->devpath_len, event->devpath_len);
457 /* one devpath is contained in the other? */
458 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
461 /* identical device event found */
462 if (loop_event->devpath_len == event->devpath_len) {
463 event->delaying_seqnum = loop_event->seqnum;
467 /* parent device event found */
468 if (event->devpath[common] == '/') {
469 event->delaying_seqnum = loop_event->seqnum;
473 /* child device event found */
474 if (loop_event->devpath[common] == '/') {
475 event->delaying_seqnum = loop_event->seqnum;
479 /* no matching device */
486 static void events_start(struct udev *udev)
488 struct udev_list_node *loop;
490 udev_list_node_foreach(loop, &event_list) {
491 struct event *event = node_to_event(loop);
493 if (event->state != EVENT_QUEUED)
496 /* do not start event if parent or child event is still running */
497 if (devpath_busy(event) != 0) {
498 dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
506 static void worker_returned(void)
509 struct worker_message msg;
511 struct udev_list_node *loop;
513 size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
514 if (size != sizeof(struct worker_message))
517 /* lookup worker who sent the signal */
518 udev_list_node_foreach(loop, &worker_list) {
519 struct worker *worker = node_to_worker(loop);
521 if (worker->pid != msg.pid)
524 /* worker returned */
525 worker->event->exitcode = msg.exitcode;
526 event_queue_delete(worker->event);
527 worker->event = NULL;
528 worker->state = WORKER_IDLE;
534 /* receive the udevd message from userspace */
535 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
537 struct udev *udev = udev_ctrl_get_udev(uctrl);
538 struct udev_ctrl_msg *ctrl_msg;
542 ctrl_msg = udev_ctrl_receive_msg(uctrl);
543 if (ctrl_msg == NULL)
546 i = udev_ctrl_get_set_log_level(ctrl_msg);
548 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
549 udev_set_log_priority(udev, i);
553 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
554 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
558 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
559 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
563 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
564 info(udev, "udevd message (RELOAD_RULES) received\n");
568 str = udev_ctrl_get_set_env(ctrl_msg);
576 val = strchr(key, '=');
580 if (val[0] == '\0') {
581 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
582 udev_add_property(udev, key, NULL);
584 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
585 udev_add_property(udev, key, val);
588 err(udev, "wrong key format '%s'\n", key);
595 i = udev_ctrl_get_set_max_childs(ctrl_msg);
597 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
601 settle_pid = udev_ctrl_get_settle(ctrl_msg);
602 if (settle_pid > 0) {
603 info(udev, "udevd message (SETTLE) received\n");
604 kill(settle_pid, SIGUSR1);
607 udev_ctrl_msg_unref(ctrl_msg);
610 /* read inotify messages */
611 static int handle_inotify(struct udev *udev)
615 struct inotify_event *ev;
617 if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
620 buf = malloc(nbytes);
622 err(udev, "error getting buffer for inotify\n");
626 nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
628 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
629 struct udev_device *dev;
631 ev = (struct inotify_event *)(buf + pos);
633 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
638 dev = udev_watch_lookup(udev, ev->wd);
640 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
641 if (ev->mask & IN_CLOSE_WRITE) {
642 char filename[UTIL_PATH_SIZE];
645 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
646 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
647 fd = open(filename, O_WRONLY);
648 if (fd < 0 || write(fd, "change", 6) < 0)
649 info(udev, "error writing uevent: %m\n");
652 if (ev->mask & IN_IGNORED)
653 udev_watch_end(udev, dev);
655 udev_device_unref(dev);
664 static void handle_signal(struct udev *udev, int signo)
675 struct udev_list_node *loop, *tmp;
677 pid = waitpid(-1, &status, WNOHANG);
681 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
682 struct worker *worker = node_to_worker(loop);
684 if (worker->pid != pid)
687 /* fail event, if worker died unexpectedly */
688 if (worker->event != NULL) {
691 if (WIFEXITED(status))
692 exitcode = WEXITSTATUS(status);
693 else if (WIFSIGNALED(status))
694 exitcode = WTERMSIG(status) + 128;
697 worker->event->exitcode = exitcode;
698 err(udev, "worker [%u] unexpectedly returned with %i\n", pid, exitcode);
699 event_queue_delete(worker->event);
702 udev_list_node_remove(&worker->node);
703 worker_unref(worker);
705 info(udev, "worker [%u] exit\n", pid);
716 static void startup_log(struct udev *udev)
719 char path[UTIL_PATH_SIZE];
722 f = fopen("/dev/kmsg", "w");
724 fprintf(f, "<6>udev: starting version " VERSION "\n");
726 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/class/mem/null", NULL);
727 if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
728 const char *depr_str =
729 "udev: missing sysfs features; please update the kernel "
730 "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
731 "udev may fail to work correctly";
734 fprintf(f, "<3>%s\n", depr_str);
735 err(udev, "%s\n", depr_str);
743 int main(int argc, char *argv[])
750 int resolve_names = 1;
751 static const struct option options[] = {
752 { "daemon", no_argument, NULL, 'd' },
753 { "debug-trace", no_argument, NULL, 't' },
754 { "debug", no_argument, NULL, 'D' },
755 { "help", no_argument, NULL, 'h' },
756 { "version", no_argument, NULL, 'V' },
757 { "resolve-names", required_argument, NULL, 'N' },
766 udev_log_init("udevd");
767 udev_set_log_fn(udev, log_fn);
768 info(udev, "version %s\n", VERSION);
769 udev_selinux_init(udev);
774 option = getopt_long(argc, argv, "dDthV", options, NULL);
787 if (udev_get_log_priority(udev) < LOG_INFO)
788 udev_set_log_priority(udev, LOG_INFO);
791 if (strcmp (optarg, "early") == 0) {
793 } else if (strcmp (optarg, "late") == 0) {
795 } else if (strcmp (optarg, "never") == 0) {
798 fprintf(stderr, "resolve-names must be early, late or never\n");
799 err(udev, "resolve-names must be early, late or never\n");
804 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
805 "[--resolve-names=early|late|never] [--version]\n");
808 printf("%s\n", VERSION);
816 fprintf(stderr, "root privileges required\n");
817 err(udev, "root privileges required\n");
821 /* make sure std{in,out,err} fd's are in a sane state */
822 fd = open("/dev/null", O_RDWR);
824 fprintf(stderr, "cannot open /dev/null\n");
825 err(udev, "cannot open /dev/null\n");
827 if (write(STDOUT_FILENO, 0, 0) < 0)
828 dup2(fd, STDOUT_FILENO);
829 if (write(STDERR_FILENO, 0, 0) < 0)
830 dup2(fd, STDERR_FILENO);
832 /* init control socket, bind() ensures, that only one udevd instance is running */
833 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
834 if (udev_ctrl == NULL) {
835 fprintf(stderr, "error initializing control socket");
836 err(udev, "error initializing udevd socket");
840 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
841 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
842 err(udev, "error binding control socket, seems udevd is already running\n");
846 pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
848 monitor = udev_monitor_new_from_netlink(udev, "kernel");
849 if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
850 fprintf(stderr, "error initializing netlink socket\n");
851 err(udev, "error initializing netlink socket\n");
855 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
856 pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
858 pfd[FD_INOTIFY].fd = udev_watch_init(udev);
859 if (pfd[FD_INOTIFY].fd < 0) {
860 fprintf(stderr, "error initializing inotify\n");
861 err(udev, "error initializing inotify\n");
866 if (udev_get_rules_path(udev) != NULL) {
867 inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
868 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
870 char filename[UTIL_PATH_SIZE];
872 inotify_add_watch(pfd[FD_INOTIFY].fd, LIBEXECDIR "/rules.d",
873 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
874 inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
875 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
877 /* watch dynamic rules directory */
878 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
879 inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
880 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
882 udev_watch_restore(udev);
884 /* block and listen to all signals on signalfd */
886 sigprocmask(SIG_SETMASK, &mask, NULL);
887 pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
888 if (pfd[FD_SIGNAL].fd < 0) {
889 fprintf(stderr, "error getting signalfd\n");
890 err(udev, "error getting signalfd\n");
895 /* unnamed socket from workers to the main daemon */
896 if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, worker_watch) < 0) {
897 fprintf(stderr, "error getting socketpair\n");
898 err(udev, "error getting socketpair\n");
902 pfd[FD_WORKER].fd = worker_watch[READ_END];
903 util_set_fd_cloexec(worker_watch[WRITE_END]);
905 rules = udev_rules_new(udev, resolve_names);
907 err(udev, "error reading rules\n");
911 udev_queue_export = udev_queue_export_new(udev);
912 if (udev_queue_export == NULL) {
913 err(udev, "error creating queue file\n");
925 err(udev, "fork of daemon failed: %m\n");
936 /* redirect std{out,err} */
937 if (!debug && !debug_trace) {
938 dup2(fd, STDIN_FILENO);
939 dup2(fd, STDOUT_FILENO);
940 dup2(fd, STDERR_FILENO);
942 if (fd > STDERR_FILENO)
945 /* set scheduling priority for the daemon */
946 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
952 /* OOM_DISABLE == -17 */
953 fd = open("/proc/self/oom_adj", O_RDWR);
955 err(udev, "error disabling OOM: %m\n");
961 /* in trace mode run one event after the other */
965 int memsize = mem_size_mb();
968 max_childs = 128 + (memsize / 8);
973 /* possibly overwrite maximum limit of executed events */
974 value = getenv("UDEVD_MAX_CHILDS");
976 max_childs = strtoul(value, NULL, 10);
977 info(udev, "initialize max_childs to %u\n", max_childs);
979 udev_list_init(&event_list);
980 udev_list_init(&worker_list);
986 /* set timeout to kill idle workers */
987 if (udev_list_is_empty(&event_list) && childs > 2)
991 /* wait for events */
992 fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
996 /* timeout - kill idle workers */
1000 /* event has finished */
1001 if (pfd[FD_WORKER].revents & POLLIN)
1004 /* get kernel uevent */
1005 if (pfd[FD_NETLINK].revents & POLLIN) {
1006 struct udev_device *dev;
1008 dev = udev_monitor_receive_device(monitor);
1010 event_queue_insert(dev);
1012 udev_device_unref(dev);
1015 /* start new events */
1016 if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
1020 if (pfd[FD_SIGNAL].revents & POLLIN) {
1021 struct signalfd_siginfo fdsi;
1024 size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
1025 if (size == sizeof(struct signalfd_siginfo))
1026 handle_signal(udev, fdsi.ssi_signo);
1029 /* device node and rules directory inotify watch */
1030 if (pfd[FD_INOTIFY].revents & POLLIN)
1031 handle_inotify(udev);
1034 * get control message
1036 * This needs to be after the inotify handling, to make sure,
1037 * that the settle signal is send back after the possibly generated
1038 * "change" events by the inotify device node watch.
1040 if (pfd[FD_CONTROL].revents & POLLIN)
1041 handle_ctrl_msg(udev_ctrl);
1043 /* rules changed, set by inotify or a HUP signal */
1044 if (reload_config) {
1045 struct udev_rules *rules_new;
1048 rules_new = udev_rules_new(udev, resolve_names);
1049 if (rules_new != NULL) {
1050 udev_rules_unref(rules);
1057 udev_queue_export_cleanup(udev_queue_export);
1060 udev_queue_export_unref(udev_queue_export);
1061 udev_rules_unref(rules);
1062 udev_ctrl_unref(udev_ctrl);
1063 if (pfd[FD_SIGNAL].fd >= 0)
1064 close(pfd[FD_SIGNAL].fd);
1065 if (worker_watch[READ_END] >= 0)
1066 close(worker_watch[READ_END]);
1067 if (worker_watch[WRITE_END] >= 0)
1068 close(worker_watch[WRITE_END]);
1069 udev_monitor_unref(monitor);
1070 udev_selinux_exit(udev);