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/>.
35 #include <sys/prctl.h>
36 #include <sys/socket.h>
37 #include <sys/signalfd.h>
38 #include <sys/select.h>
42 #include <sys/ioctl.h>
43 #include <sys/inotify.h>
47 #define UDEVD_PRIORITY -4
48 #define UDEV_PRIORITY -2
52 static void log_fn(struct udev *udev, int priority,
53 const char *file, int line, const char *fn,
54 const char *format, va_list args)
61 vsnprintf(buf, sizeof(buf), format, args);
62 gettimeofday(&tv, &tz);
63 fprintf(stderr, "%llu.%06u [%u] %s: %s",
64 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
65 (int) getpid(), fn, buf);
67 vsyslog(priority, format, args);
71 static bool debug_trace;
72 static struct udev_rules *rules;
73 static struct udev_queue_export *udev_queue_export;
74 static struct udev_ctrl *udev_ctrl;
75 static struct udev_monitor *monitor;
76 static int worker_watch[2];
77 static pid_t settle_pid;
78 static bool stop_exec_queue;
79 static bool reload_config;
80 static int max_childs;
82 static struct udev_list_node event_list;
83 static struct udev_list_node worker_list;
84 static bool udev_exit;
85 static volatile sig_atomic_t worker_exit;
95 static struct pollfd pfd[] = {
96 [FD_NETLINK] = { .events = POLLIN },
97 [FD_WORKER] = { .events = POLLIN },
98 [FD_SIGNAL] = { .events = POLLIN },
99 [FD_INOTIFY] = { .events = POLLIN },
100 [FD_CONTROL] = { .events = POLLIN },
110 struct udev_list_node node;
112 struct udev_device *dev;
113 enum event_state state;
115 unsigned long long int delaying_seqnum;
116 unsigned long long int seqnum;
119 const char *devpath_old;
122 static struct event *node_to_event(struct udev_list_node *node)
126 event = (char *)node;
127 event -= offsetof(struct event, node);
128 return (struct event *)event;
139 struct udev_list_node node;
143 struct udev_monitor *monitor;
144 enum worker_state state;
148 /* passed from worker to main process */
149 struct worker_message {
154 static struct worker *node_to_worker(struct udev_list_node *node)
158 worker = (char *)node;
159 worker -= offsetof(struct worker, node);
160 return (struct worker *)worker;
163 static void event_queue_delete(struct event *event)
165 udev_list_node_remove(&event->node);
167 /* mark as failed, if "add" event returns non-zero */
168 if (event->exitcode && strcmp(udev_device_get_action(event->dev), "add") == 0)
169 udev_queue_export_device_failed(udev_queue_export, event->dev);
171 udev_queue_export_device_finished(udev_queue_export, event->dev);
173 info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
174 udev_device_unref(event->dev);
178 static void event_sig_handler(int signum)
190 static struct worker *worker_ref(struct worker *worker)
196 static void worker_unref(struct worker *worker)
199 if (worker->refcount > 0)
202 udev_list_node_remove(&worker->node);
203 udev_monitor_unref(worker->monitor);
205 info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
209 static void worker_new(struct event *event)
211 struct worker *worker;
212 struct udev_monitor *worker_monitor;
214 struct sigaction act;
216 /* listen for new events */
217 worker_monitor = udev_monitor_new_from_netlink(event->udev, NULL);
218 if (worker_monitor == NULL)
220 /* allow the main daemon netlink address to send devices to the worker */
221 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
222 udev_monitor_enable_receiving(worker_monitor);
223 util_set_fd_cloexec(udev_monitor_get_fd(worker_monitor));
225 worker = calloc(1, sizeof(struct worker));
228 /* worker + event reference */
229 worker->refcount = 2;
230 worker->udev = event->udev;
236 struct udev_device *dev;
237 struct pollfd pmon = {
238 .fd = udev_monitor_get_fd(worker_monitor),
242 udev_queue_export_unref(udev_queue_export);
243 udev_monitor_unref(monitor);
244 udev_ctrl_unref(udev_ctrl);
245 close(pfd[FD_SIGNAL].fd);
246 close(worker_watch[READ_END]);
248 udev_log_init("udevd-work");
249 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
251 /* set signal handlers */
252 memset(&act, 0x00, sizeof(act));
253 act.sa_handler = event_sig_handler;
254 sigemptyset (&act.sa_mask);
256 sigaction(SIGTERM, &act, NULL);
257 sigaction(SIGALRM, &act, NULL);
259 /* unblock SIGALRM */
260 sigfillset(&sigmask);
261 sigdelset(&sigmask, SIGALRM);
262 sigprocmask(SIG_SETMASK, &sigmask, NULL);
263 /* SIGTERM is unblocked in ppoll() */
264 sigdelset(&sigmask, SIGTERM);
266 /* request TERM signal if parent exits */
267 prctl(PR_SET_PDEATHSIG, SIGTERM);
273 struct udev_event *udev_event;
274 struct worker_message msg;
277 info(event->udev, "seq %llu running\n", udev_device_get_seqnum(dev));
278 udev_event = udev_event_new(dev);
279 if (udev_event == NULL)
282 /* set timeout to prevent hanging processes */
283 alarm(UDEV_EVENT_TIMEOUT);
285 /* apply rules, create node, symlinks */
286 err = udev_event_execute_rules(udev_event, rules);
288 /* rules may change/disable the timeout */
289 if (udev_device_get_event_timeout(dev) >= 0)
290 alarm(udev_device_get_event_timeout(dev));
293 if (err == 0 && !udev_event->ignore_device && udev_get_run(udev_event->udev))
294 udev_event_execute_run(udev_event);
299 /* apply/restore inotify watch */
300 if (err == 0 && udev_event->inotify_watch) {
301 udev_watch_begin(udev_event->udev, dev);
302 udev_device_update_db(dev);
305 /* send processed event back to libudev listeners */
306 udev_monitor_send_device(worker_monitor, NULL, dev);
308 /* send back the result of the event execution */
311 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
313 info(event->udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
314 udev_event_unref(udev_event);
315 udev_device_unref(dev);
318 /* wait for more device messages or signal from udevd */
319 while (!worker_exit) {
322 fdcount = ppoll(&pmon, 1, NULL, &sigmask);
326 if (pmon.revents & POLLIN) {
327 dev = udev_monitor_receive_device(worker_monitor);
332 } while (dev != NULL);
334 udev_monitor_unref(worker_monitor);
339 udev_monitor_unref(worker_monitor);
340 event->state = EVENT_QUEUED;
342 err(event->udev, "fork of child failed: %m\n");
345 /* close monitor, but keep address around */
346 udev_monitor_disconnect(worker_monitor);
347 worker->monitor = worker_monitor;
349 worker->state = WORKER_RUNNING;
350 worker->event = event;
351 event->state = EVENT_RUNNING;
352 udev_list_node_append(&worker->node, &worker_list);
354 info(event->udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
359 static void event_run(struct event *event)
361 struct udev_list_node *loop;
363 udev_list_node_foreach(loop, &worker_list) {
364 struct worker *worker = node_to_worker(loop);
367 if (worker->state != WORKER_IDLE)
370 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
372 err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
373 kill(worker->pid, SIGKILL);
374 worker->state = WORKER_KILLED;
378 worker->event = event;
379 worker->state = WORKER_RUNNING;
380 event->state = EVENT_RUNNING;
384 if (childs >= max_childs) {
385 info(event->udev, "maximum number (%i) of childs reached\n", childs);
389 /* start new worker and pass initial device */
393 static void event_queue_insert(struct udev_device *dev)
397 event = calloc(1, sizeof(struct event));
401 event->udev = udev_device_get_udev(dev);
403 event->seqnum = udev_device_get_seqnum(dev);
404 event->devpath = udev_device_get_devpath(dev);
405 event->devpath_len = strlen(event->devpath);
406 event->devpath_old = udev_device_get_devpath_old(dev);
408 udev_queue_export_device_queued(udev_queue_export, dev);
409 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
410 udev_device_get_action(dev), udev_device_get_subsystem(dev));
412 event->state = EVENT_QUEUED;
413 udev_list_node_append(&event->node, &event_list);
415 /* run all events with a timeout set immediately */
416 if (udev_device_get_timeout(dev) > 0) {
422 static void worker_kill(struct udev *udev, int retain)
424 struct udev_list_node *loop;
427 if (childs <= retain)
430 max = childs - retain;
432 udev_list_node_foreach(loop, &worker_list) {
433 struct worker *worker = node_to_worker(loop);
438 if (worker->state == WORKER_KILLED)
441 worker->state = WORKER_KILLED;
442 kill(worker->pid, SIGTERM);
446 static int mem_size_mb(void)
450 long int memsize = -1;
452 f = fopen("/proc/meminfo", "r");
456 while (fgets(buf, sizeof(buf), f) != NULL) {
459 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
460 memsize = value / 1024;
469 /* lookup event for identical, parent, child device */
470 static int devpath_busy(struct event *event)
472 struct udev_list_node *loop;
475 /* check if queue contains events we depend on */
476 udev_list_node_foreach(loop, &event_list) {
477 struct event *loop_event = node_to_event(loop);
479 /* we already found a later event, earlier can not block us, no need to check again */
480 if (loop_event->seqnum < event->delaying_seqnum)
483 /* event we checked earlier still exists, no need to check again */
484 if (loop_event->seqnum == event->delaying_seqnum)
487 /* found ourself, no later event can block us */
488 if (loop_event->seqnum >= event->seqnum)
491 /* check our old name */
492 if (event->devpath_old != NULL)
493 if (strcmp(loop_event->devpath, event->devpath_old) == 0) {
494 event->delaying_seqnum = loop_event->seqnum;
498 /* compare devpath */
499 common = MIN(loop_event->devpath_len, event->devpath_len);
501 /* one devpath is contained in the other? */
502 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
505 /* identical device event found */
506 if (loop_event->devpath_len == event->devpath_len) {
507 event->delaying_seqnum = loop_event->seqnum;
511 /* parent device event found */
512 if (event->devpath[common] == '/') {
513 event->delaying_seqnum = loop_event->seqnum;
517 /* child device event found */
518 if (loop_event->devpath[common] == '/') {
519 event->delaying_seqnum = loop_event->seqnum;
523 /* no matching device */
530 static void events_start(struct udev *udev)
532 struct udev_list_node *loop;
534 udev_list_node_foreach(loop, &event_list) {
535 struct event *event = node_to_event(loop);
537 if (event->state != EVENT_QUEUED)
540 /* do not start event if parent or child event is still running */
541 if (devpath_busy(event) != 0) {
542 dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
550 static void worker_returned(void)
553 struct worker_message msg;
555 struct udev_list_node *loop;
557 size = recv(pfd[FD_WORKER].fd, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
558 if (size != sizeof(struct worker_message))
561 /* lookup worker who sent the signal */
562 udev_list_node_foreach(loop, &worker_list) {
563 struct worker *worker = node_to_worker(loop);
565 if (worker->pid != msg.pid)
568 /* worker returned */
569 worker->event->exitcode = msg.exitcode;
570 event_queue_delete(worker->event);
571 worker->event = NULL;
572 if (worker->state != WORKER_KILLED)
573 worker->state = WORKER_IDLE;
574 worker_unref(worker);
580 /* receive the udevd message from userspace */
581 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
583 struct udev *udev = udev_ctrl_get_udev(uctrl);
584 struct udev_ctrl_msg *ctrl_msg;
588 ctrl_msg = udev_ctrl_receive_msg(uctrl);
589 if (ctrl_msg == NULL)
592 i = udev_ctrl_get_set_log_level(ctrl_msg);
594 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
595 udev_set_log_priority(udev, i);
596 worker_kill(udev, 0);
599 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
600 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
601 stop_exec_queue = true;
604 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
605 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
606 stop_exec_queue = false;
609 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
610 info(udev, "udevd message (RELOAD_RULES) received\n");
611 reload_config = true;
614 str = udev_ctrl_get_set_env(ctrl_msg);
622 val = strchr(key, '=');
626 if (val[0] == '\0') {
627 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
628 udev_add_property(udev, key, NULL);
630 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
631 udev_add_property(udev, key, val);
634 err(udev, "wrong key format '%s'\n", key);
638 worker_kill(udev, 0);
641 i = udev_ctrl_get_set_max_childs(ctrl_msg);
643 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
647 settle_pid = udev_ctrl_get_settle(ctrl_msg);
648 if (settle_pid > 0) {
649 info(udev, "udevd message (SETTLE) received\n");
650 kill(settle_pid, SIGUSR1);
653 udev_ctrl_msg_unref(ctrl_msg);
656 /* read inotify messages */
657 static int handle_inotify(struct udev *udev)
661 struct inotify_event *ev;
663 if ((ioctl(pfd[FD_INOTIFY].fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
666 buf = malloc(nbytes);
668 err(udev, "error getting buffer for inotify\n");
672 nbytes = read(pfd[FD_INOTIFY].fd, buf, nbytes);
674 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
675 struct udev_device *dev;
677 ev = (struct inotify_event *)(buf + pos);
679 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
680 reload_config = true;
684 dev = udev_watch_lookup(udev, ev->wd);
686 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
687 if (ev->mask & IN_CLOSE_WRITE) {
688 char filename[UTIL_PATH_SIZE];
691 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
692 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
693 fd = open(filename, O_WRONLY);
694 if (fd < 0 || write(fd, "change", 6) < 0)
695 info(udev, "error writing uevent: %m\n");
698 if (ev->mask & IN_IGNORED)
699 udev_watch_end(udev, dev);
701 udev_device_unref(dev);
710 static void handle_signal(struct udev *udev, int signo)
721 struct udev_list_node *loop, *tmp;
723 pid = waitpid(-1, &status, WNOHANG);
727 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
728 struct worker *worker = node_to_worker(loop);
730 if (worker->pid != pid)
733 info(udev, "worker [%u] exit\n", pid);
734 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
735 err(udev, "worker [%u] unexpectedly returned with status 0x%04x\n", pid, status);
736 if (worker->event != NULL) {
737 err(udev, "worker [%u] failed while handling '%s'\n", pid, worker->event->devpath);
738 worker->event->exitcode = -32;
739 event_queue_delete(worker->event);
740 /* drop reference from running event */
741 worker_unref(worker);
744 worker_unref(worker);
750 reload_config = true;
755 static void startup_log(struct udev *udev)
758 char path[UTIL_PATH_SIZE];
761 f = fopen("/dev/kmsg", "w");
763 fprintf(f, "<6>udev: starting version " VERSION "\n");
765 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/class/mem/null", NULL);
766 if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
767 const char *depr_str =
768 "udev: missing sysfs features; please update the kernel "
769 "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
770 "udev may fail to work correctly";
773 fprintf(f, "<3>%s\n", depr_str);
774 err(udev, "%s\n", depr_str);
782 int main(int argc, char *argv[])
788 int daemonize = false;
789 int resolve_names = 1;
790 static const struct option options[] = {
791 { "daemon", no_argument, NULL, 'd' },
792 { "debug-trace", no_argument, NULL, 't' },
793 { "debug", no_argument, NULL, 'D' },
794 { "help", no_argument, NULL, 'h' },
795 { "version", no_argument, NULL, 'V' },
796 { "resolve-names", required_argument, NULL, 'N' },
805 udev_log_init("udevd");
806 udev_set_log_fn(udev, log_fn);
807 info(udev, "version %s\n", VERSION);
808 udev_selinux_init(udev);
813 option = getopt_long(argc, argv, "dDthV", options, NULL);
826 if (udev_get_log_priority(udev) < LOG_INFO)
827 udev_set_log_priority(udev, LOG_INFO);
830 if (strcmp (optarg, "early") == 0) {
832 } else if (strcmp (optarg, "late") == 0) {
834 } else if (strcmp (optarg, "never") == 0) {
837 fprintf(stderr, "resolve-names must be early, late or never\n");
838 err(udev, "resolve-names must be early, late or never\n");
843 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
844 "[--resolve-names=early|late|never] [--version]\n");
847 printf("%s\n", VERSION);
855 fprintf(stderr, "root privileges required\n");
856 err(udev, "root privileges required\n");
860 /* make sure std{in,out,err} fd's are in a sane state */
861 fd = open("/dev/null", O_RDWR);
863 fprintf(stderr, "cannot open /dev/null\n");
864 err(udev, "cannot open /dev/null\n");
866 if (write(STDOUT_FILENO, 0, 0) < 0)
867 dup2(fd, STDOUT_FILENO);
868 if (write(STDERR_FILENO, 0, 0) < 0)
869 dup2(fd, STDERR_FILENO);
871 /* init control socket, bind() ensures, that only one udevd instance is running */
872 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
873 if (udev_ctrl == NULL) {
874 fprintf(stderr, "error initializing control socket");
875 err(udev, "error initializing udevd socket");
879 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
880 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
881 err(udev, "error binding control socket, seems udevd is already running\n");
885 pfd[FD_CONTROL].fd = udev_ctrl_get_fd(udev_ctrl);
887 monitor = udev_monitor_new_from_netlink(udev, "kernel");
888 if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
889 fprintf(stderr, "error initializing netlink socket\n");
890 err(udev, "error initializing netlink socket\n");
894 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
895 pfd[FD_NETLINK].fd = udev_monitor_get_fd(monitor);
897 pfd[FD_INOTIFY].fd = udev_watch_init(udev);
898 if (pfd[FD_INOTIFY].fd < 0) {
899 fprintf(stderr, "error initializing inotify\n");
900 err(udev, "error initializing inotify\n");
905 if (udev_get_rules_path(udev) != NULL) {
906 inotify_add_watch(pfd[FD_INOTIFY].fd, udev_get_rules_path(udev),
907 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
909 char filename[UTIL_PATH_SIZE];
911 inotify_add_watch(pfd[FD_INOTIFY].fd, LIBEXECDIR "/rules.d",
912 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
913 inotify_add_watch(pfd[FD_INOTIFY].fd, SYSCONFDIR "/udev/rules.d",
914 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
916 /* watch dynamic rules directory */
917 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
918 inotify_add_watch(pfd[FD_INOTIFY].fd, filename,
919 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
921 udev_watch_restore(udev);
923 /* block and listen to all signals on signalfd */
925 sigprocmask(SIG_SETMASK, &mask, NULL);
926 pfd[FD_SIGNAL].fd = signalfd(-1, &mask, 0);
927 if (pfd[FD_SIGNAL].fd < 0) {
928 fprintf(stderr, "error getting signalfd\n");
929 err(udev, "error getting signalfd\n");
934 /* unnamed socket from workers to the main daemon */
935 if (socketpair(AF_LOCAL, SOCK_DGRAM, 0, worker_watch) < 0) {
936 fprintf(stderr, "error getting socketpair\n");
937 err(udev, "error getting socketpair\n");
941 pfd[FD_WORKER].fd = worker_watch[READ_END];
942 util_set_fd_cloexec(worker_watch[WRITE_END]);
944 rules = udev_rules_new(udev, resolve_names);
946 err(udev, "error reading rules\n");
950 udev_queue_export = udev_queue_export_new(udev);
951 if (udev_queue_export == NULL) {
952 err(udev, "error creating queue file\n");
964 err(udev, "fork of daemon failed: %m\n");
975 /* redirect std{out,err} */
976 if (!debug && !debug_trace) {
977 dup2(fd, STDIN_FILENO);
978 dup2(fd, STDOUT_FILENO);
979 dup2(fd, STDERR_FILENO);
981 if (fd > STDERR_FILENO)
984 /* set scheduling priority for the daemon */
985 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
991 /* OOM_DISABLE == -17 */
992 fd = open("/proc/self/oom_adj", O_RDWR);
994 err(udev, "error disabling OOM: %m\n");
1000 /* in trace mode run one event after the other */
1004 int memsize = mem_size_mb();
1007 max_childs = 128 + (memsize / 8);
1012 /* possibly overwrite maximum limit of executed events */
1013 value = getenv("UDEVD_MAX_CHILDS");
1015 max_childs = strtoul(value, NULL, 10);
1016 info(udev, "initialize max_childs to %u\n", max_childs);
1018 udev_list_init(&event_list);
1019 udev_list_init(&worker_list);
1021 while (!udev_exit) {
1025 /* set timeout to kill idle workers */
1026 if (udev_list_is_empty(&event_list) && childs > 2)
1030 /* wait for events */
1031 fdcount = poll(pfd, ARRAY_SIZE(pfd), timeout);
1035 /* timeout - kill idle workers */
1037 worker_kill(udev, 2);
1039 /* event has finished */
1040 if (pfd[FD_WORKER].revents & POLLIN)
1043 /* get kernel uevent */
1044 if (pfd[FD_NETLINK].revents & POLLIN) {
1045 struct udev_device *dev;
1047 dev = udev_monitor_receive_device(monitor);
1049 event_queue_insert(dev);
1051 udev_device_unref(dev);
1054 /* start new events */
1055 if (!udev_list_is_empty(&event_list) && !stop_exec_queue)
1059 if (pfd[FD_SIGNAL].revents & POLLIN) {
1060 struct signalfd_siginfo fdsi;
1063 size = read(pfd[FD_SIGNAL].fd, &fdsi, sizeof(struct signalfd_siginfo));
1064 if (size == sizeof(struct signalfd_siginfo))
1065 handle_signal(udev, fdsi.ssi_signo);
1068 /* device node and rules directory inotify watch */
1069 if (pfd[FD_INOTIFY].revents & POLLIN)
1070 handle_inotify(udev);
1073 * get control message
1075 * This needs to be after the inotify handling, to make sure,
1076 * that the settle signal is send back after the possibly generated
1077 * "change" events by the inotify device node watch.
1079 if (pfd[FD_CONTROL].revents & POLLIN)
1080 handle_ctrl_msg(udev_ctrl);
1082 /* rules changed, set by inotify or a HUP signal */
1083 if (reload_config) {
1084 struct udev_rules *rules_new;
1086 worker_kill(udev, 0);
1087 rules_new = udev_rules_new(udev, resolve_names);
1088 if (rules_new != NULL) {
1089 udev_rules_unref(rules);
1096 udev_queue_export_cleanup(udev_queue_export);
1099 udev_queue_export_unref(udev_queue_export);
1100 udev_rules_unref(rules);
1101 udev_ctrl_unref(udev_ctrl);
1102 if (pfd[FD_SIGNAL].fd >= 0)
1103 close(pfd[FD_SIGNAL].fd);
1104 if (worker_watch[READ_END] >= 0)
1105 close(worker_watch[READ_END]);
1106 if (worker_watch[WRITE_END] >= 0)
1107 close(worker_watch[WRITE_END]);
1108 udev_monitor_unref(monitor);
1109 udev_selinux_exit(udev);