2 * Copyright (C) 2004-2008 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/select.h>
37 #include <sys/ioctl.h>
39 #include <sys/inotify.h>
44 #define UDEVD_PRIORITY -4
45 #define UDEV_PRIORITY -2
47 /* maximum limit of forked childs */
48 #define UDEVD_MAX_CHILDS 256
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)
57 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
58 vfprintf(stderr, format, args);
60 vsyslog(priority, format, args);
64 static void reap_sigchilds(void);
66 static int debug_trace;
67 static struct udev_rules *rules;
68 static struct udev_ctrl *udev_ctrl;
69 static struct udev_monitor *kernel_monitor;
70 static volatile sig_atomic_t sigchilds_waiting;
71 static volatile sig_atomic_t udev_exit;
72 static volatile sig_atomic_t reload_config;
73 static volatile sig_atomic_t signal_received;
74 static volatile pid_t settle_pid;
75 static int run_exec_q;
76 static int stop_exec_q;
77 static int max_childs;
79 static struct udev_list_node event_list;
87 static struct udev_event *node_to_event(struct udev_list_node *node)
92 event -= offsetof(struct udev_event, node);
93 return (struct udev_event *)event;
96 static void export_event_state(struct udev_event *event, enum event_state state)
98 char filename[UTIL_PATH_SIZE];
99 char filename_failed[UTIL_PATH_SIZE];
103 /* location of queue file */
104 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
105 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
107 /* location of failed file */
109 l = util_strpcpyl(&s, sizeof(filename_failed), udev_get_dev_path(event->udev), "/.udev/failed/", NULL);
110 util_path_encode(udev_device_get_devpath(event->dev), s, l);
114 if(unlink(filename_failed) == 0)
115 util_delete_path(event->udev, filename_failed);
116 util_create_path(event->udev, filename);
117 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
118 symlink(udev_device_get_devpath(event->dev), filename);
119 udev_selinux_resetfscreatecon(event->udev);
122 if (udev_device_get_devpath_old(event->dev) != NULL) {
123 /* "move" event - rename failed file to current name, do not delete failed */
124 char filename_failed_old[UTIL_PATH_SIZE];
126 s = filename_failed_old;
127 l = util_strpcpyl(&s, sizeof(filename_failed_old), udev_get_dev_path(event->udev), "/.udev/failed/", NULL);
128 util_path_encode(udev_device_get_devpath_old(event->dev), s, l);
129 if (rename(filename_failed_old, filename_failed) == 0)
130 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
131 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
133 if (unlink(filename_failed) == 0)
134 util_delete_path(event->udev, filename_failed);
139 /* clean up possibly empty queue directory */
140 if (udev_list_is_empty(&event_list))
141 util_delete_path(event->udev, filename);
144 /* move failed event to the failed directory */
145 util_create_path(event->udev, filename_failed);
146 rename(filename, filename_failed);
148 /* clean up possibly empty queue directory */
149 if (udev_list_is_empty(&event_list))
150 util_delete_path(event->udev, filename);
157 static void event_queue_delete(struct udev_event *event)
159 udev_list_node_remove(&event->node);
161 /* mark as failed, if "add" event returns non-zero */
162 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
163 export_event_state(event, EVENT_FAILED);
165 export_event_state(event, EVENT_FINISHED);
167 udev_device_unref(event->dev);
168 udev_event_unref(event);
171 static void event_sig_handler(int signum)
173 if (signum == SIGALRM)
177 static void event_fork(struct udev_event *event)
180 struct sigaction act;
184 /* single process, no forking, just for testing/profiling */
185 err = udev_event_execute_rules(event, rules);
186 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
187 udev_event_execute_run(event);
188 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
189 event_queue_delete(event);
195 fprintf(stderr, "fork %s (%llu)\n",
196 udev_device_get_syspath(event->dev),
197 udev_device_get_seqnum(event->dev));
204 udev_ctrl_unref(udev_ctrl);
206 logging_init("udevd-event");
207 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
209 /* set signal handlers */
210 memset(&act, 0x00, sizeof(act));
211 act.sa_handler = event_sig_handler;
212 sigemptyset (&act.sa_mask);
214 sigaction(SIGALRM, &act, NULL);
216 /* reset to default */
217 act.sa_handler = SIG_DFL;
218 sigaction(SIGINT, &act, NULL);
219 sigaction(SIGTERM, &act, NULL);
220 sigaction(SIGCHLD, &act, NULL);
221 sigaction(SIGHUP, &act, NULL);
223 /* set timeout to prevent hanging processes */
224 alarm(UDEV_EVENT_TIMEOUT);
226 /* apply rules, create node, symlinks */
227 err = udev_event_execute_rules(event, rules);
229 /* rules may change/disable the timeout */
230 if (udev_device_get_event_timeout(event->dev) >= 0)
231 alarm(udev_device_get_event_timeout(event->dev));
234 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
235 udev_event_execute_run(event);
237 /* apply/restore inotify watch */
238 if (err == 0 && event->inotify_watch) {
239 udev_watch_begin(event->udev, event->dev);
240 udev_device_update_db(event->dev);
243 /* send processed event back to the kernel netlink socket */
244 udev_monitor_send_device(kernel_monitor, event->dev);
246 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
252 err(event->udev, "fork of child failed: %m\n");
253 event_queue_delete(event);
256 /* get SIGCHLD in main loop */
257 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
258 udev_device_get_seqnum(event->dev),
260 udev_device_get_action(event->dev),
261 udev_device_get_subsystem(event->dev),
262 time(NULL) - event->queue_time);
268 static void event_queue_insert(struct udev_event *event)
270 char filename[UTIL_PATH_SIZE];
273 event->queue_time = time(NULL);
275 export_event_state(event, EVENT_QUEUED);
276 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
277 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
279 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/.udev/uevent_seqnum", NULL);
280 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
285 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
291 udev_list_node_append(&event->node, &event_list);
294 /* run all events with a timeout set immediately */
295 if (udev_device_get_timeout(event->dev) > 0) {
301 static int mem_size_mb(void)
305 long int memsize = -1;
307 f = fopen("/proc/meminfo", "r");
311 while (fgets(buf, sizeof(buf), f) != NULL) {
314 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
315 memsize = value / 1024;
324 static int compare_devpath(const char *running, const char *waiting)
328 while (running[i] != '\0' && running[i] == waiting[i])
331 /* identical device event found */
332 if (running[i] == '\0' && waiting[i] == '\0')
335 /* parent device event found */
336 if (running[i] == '\0' && waiting[i] == '/')
339 /* child device event found */
340 if (running[i] == '/' && waiting[i] == '\0')
343 /* no matching event */
347 /* lookup event for identical, parent, child device */
348 static int devpath_busy(struct udev_event *event)
350 struct udev_list_node *loop;
352 if (event->delaying_seqnum > 0) {
354 /* check if queue contains events we depend on */
355 udev_list_node_foreach(loop, &event_list) {
356 struct udev_event *loop_event = node_to_event(loop);
358 /* we already found a later event, earlier can not block us, no need to check again */
359 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
362 /* event we checked earlier still exists, no need to check again */
363 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
366 /* found ourself, no later event can block us */
367 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
370 /* check our old name */
371 if (udev_device_get_devpath_old(event->dev) != NULL)
372 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
373 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
377 /* check identical, parent, or child device event */
378 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
379 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
380 udev_device_get_seqnum(event->dev),
381 udev_device_get_seqnum(loop_event->dev),
382 udev_device_get_devpath(loop_event->dev));
383 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
387 /* check for our major:minor number */
388 if (major(udev_device_get_devnum(event->dev)) > 0 &&
389 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
390 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
391 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
392 udev_device_get_seqnum(event->dev),
393 udev_device_get_seqnum(loop_event->dev),
394 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
395 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
402 /* serializes events for the identical and parent and child devices */
403 static void event_queue_manager(struct udev *udev)
405 struct udev_list_node *loop;
406 struct udev_list_node *tmp;
409 if (udev_list_is_empty(&event_list)) {
411 err(udev, "event list empty, but childs count is %i", childs);
417 udev_list_node_foreach_safe(loop, tmp, &event_list) {
418 struct udev_event *loop_event = node_to_event(loop);
420 if (childs >= max_childs) {
421 info(udev, "maximum number (%i) of childs reached\n", childs);
425 if (loop_event->pid != 0)
428 /* do not start event if parent or child event is still running */
429 if (devpath_busy(loop_event) != 0) {
430 dbg(udev, "delay seq %llu (%s)\n",
431 udev_device_get_seqnum(loop_event->dev),
432 udev_device_get_devpath(loop_event->dev));
436 event_fork(loop_event);
437 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
439 /* retry if events finished in the meantime */
440 if (sigchilds_waiting) {
441 sigchilds_waiting = 0;
448 /* receive the udevd message from userspace */
449 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
451 struct udev *udev = udev_ctrl_get_udev(uctrl);
452 struct udev_ctrl_msg *ctrl_msg;
456 ctrl_msg = udev_ctrl_receive_msg(uctrl);
457 if (ctrl_msg == NULL)
460 i = udev_ctrl_get_set_log_level(ctrl_msg);
462 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
463 udev_set_log_priority(udev, i);
466 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
467 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
471 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
472 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
474 event_queue_manager(udev);
477 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
478 info(udev, "udevd message (RELOAD_RULES) received\n");
482 str = udev_ctrl_get_set_env(ctrl_msg);
490 val = strchr(key, '=');
494 if (val[0] == '\0') {
495 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
496 udev_add_property(udev, key, NULL);
498 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
499 udev_add_property(udev, key, val);
502 err(udev, "wrong key format '%s'\n", key);
508 i = udev_ctrl_get_set_max_childs(ctrl_msg);
510 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
514 settle_pid = udev_ctrl_get_settle(ctrl_msg);
515 if (settle_pid > 0) {
516 info(udev, "udevd message (SETTLE) received\n");
518 udev_ctrl_msg_unref(ctrl_msg);
521 /* read inotify messages */
522 static int handle_inotify(struct udev *udev)
526 struct inotify_event *ev;
528 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
531 buf = malloc(nbytes);
533 err(udev, "error getting buffer for inotify, disable watching\n");
539 read(inotify_fd, buf, nbytes);
541 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
542 struct udev_device *dev;
544 ev = (struct inotify_event *)(buf + pos);
546 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
551 dev = udev_watch_lookup(udev, ev->wd);
553 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
554 if (ev->mask & IN_CLOSE_WRITE) {
555 char filename[UTIL_PATH_SIZE];
558 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
559 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
560 fd = open(filename, O_WRONLY);
561 if (fd < 0 || write(fd, "change", 6) < 0)
562 info(udev, "error writing uevent: %m\n");
565 if (ev->mask & IN_IGNORED)
566 udev_watch_end(udev, dev);
568 udev_device_unref(dev);
577 static void sig_handler(int signum)
585 /* set flag, then write to pipe if needed */
586 sigchilds_waiting = 1;
596 static void udev_done(int pid, int exitstatus)
598 struct udev_list_node *loop;
600 /* find event associated with pid and delete it */
601 udev_list_node_foreach(loop, &event_list) {
602 struct udev_event *loop_event = node_to_event(loop);
604 if (loop_event->pid == pid) {
605 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
606 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
607 exitstatus, time(NULL) - loop_event->queue_time);
608 loop_event->exitstatus = exitstatus;
610 fprintf(stderr, "exit %s (%llu)\n",
611 udev_device_get_syspath(loop_event->dev),
612 udev_device_get_seqnum(loop_event->dev));
613 event_queue_delete(loop_event);
616 /* there may be dependent events waiting */
623 static void reap_sigchilds(void)
629 pid = waitpid(-1, &status, WNOHANG);
632 if (WIFEXITED(status))
633 status = WEXITSTATUS(status);
634 else if (WIFSIGNALED(status))
635 status = WTERMSIG(status) + 128;
638 udev_done(pid, status);
642 static void cleanup_queue_dir(struct udev *udev)
644 char dirname[UTIL_PATH_SIZE];
645 char filename[UTIL_PATH_SIZE];
648 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/uevent_seqnum", NULL);
651 util_strscpyl(dirname, sizeof(dirname), udev_get_dev_path(udev), "/.udev/queue", NULL);
652 dir = opendir(dirname);
658 if (dent == NULL || dent->d_name[0] == '\0')
660 if (dent->d_name[0] == '.')
662 unlinkat(dirfd(dir), dent->d_name, 0);
669 static void export_initial_seqnum(struct udev *udev)
671 char filename[UTIL_PATH_SIZE];
676 util_strscpyl(filename, sizeof(filename), udev_get_sys_path(udev), "/kernel/uevent_seqnum", NULL);
677 fd = open(filename, O_RDONLY);
679 len = read(fd, seqnum, sizeof(seqnum)-1);
683 strcpy(seqnum, "0\n");
686 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/uevent_seqnum", NULL);
687 util_create_path(udev, filename);
688 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
690 write(fd, seqnum, len);
695 static void startup_log(struct udev *udev)
698 char path[UTIL_PATH_SIZE];
701 f = fopen("/dev/kmsg", "w");
703 fprintf(f, "<6>udev: starting version " VERSION "\n");
705 util_strscpyl(path, sizeof(path), udev_get_sys_path(udev), "/class/mem/null", NULL);
706 if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
707 const char *depr_str =
708 "udev: missing sysfs features; please update the kernel "
709 "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
710 "udev may fail to work correctly";
713 fprintf(f, "<3>%s\n", depr_str);
714 err(udev, "%s\n", depr_str);
722 int main(int argc, char *argv[])
726 struct sigaction act;
729 int resolve_names = 1;
730 static const struct option options[] = {
731 { "daemon", no_argument, NULL, 'd' },
732 { "debug-trace", no_argument, NULL, 't' },
733 { "debug", no_argument, NULL, 'D' },
734 { "help", no_argument, NULL, 'h' },
735 { "version", no_argument, NULL, 'V' },
736 { "resolve-names", required_argument, NULL, 'N' },
745 logging_init("udevd");
746 udev_set_log_fn(udev, log_fn);
747 info(udev, "version %s\n", VERSION);
748 udev_selinux_init(udev);
753 option = getopt_long(argc, argv, "dDthV", options, NULL);
766 if (udev_get_log_priority(udev) < LOG_INFO)
767 udev_set_log_priority(udev, LOG_INFO);
770 if (strcmp (optarg, "early") == 0) {
772 } else if (strcmp (optarg, "late") == 0) {
774 } else if (strcmp (optarg, "never") == 0) {
777 fprintf(stderr, "resolve-names must be early, late or never\n");
778 err(udev, "resolve-names must be early, late or never\n");
783 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
784 "[--resolve-names=early|late|never] [--version]\n");
787 printf("%s\n", VERSION);
795 fprintf(stderr, "root privileges required\n");
796 err(udev, "root privileges required\n");
800 /* make sure std{in,out,err} fd's are in a sane state */
801 fd = open("/dev/null", O_RDWR);
803 fprintf(stderr, "cannot open /dev/null\n");
804 err(udev, "cannot open /dev/null\n");
806 if (write(STDOUT_FILENO, 0, 0) < 0)
807 dup2(fd, STDOUT_FILENO);
808 if (write(STDERR_FILENO, 0, 0) < 0)
809 dup2(fd, STDERR_FILENO);
811 /* init control socket, bind() ensures, that only one udevd instance is running */
812 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
813 if (udev_ctrl == NULL) {
814 fprintf(stderr, "error initializing control socket");
815 err(udev, "error initializing udevd socket");
820 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
821 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
822 err(udev, "error binding control socket, seems udevd is already running\n");
827 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
828 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
829 fprintf(stderr, "error initializing netlink socket\n");
830 err(udev, "error initializing netlink socket\n");
834 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
836 rules = udev_rules_new(udev, resolve_names);
838 err(udev, "error reading rules\n");
841 udev_list_init(&event_list);
842 cleanup_queue_dir(udev);
843 export_initial_seqnum(udev);
851 dbg(udev, "daemonized fork running\n");
854 err(udev, "fork of daemon failed: %m\n");
858 dbg(udev, "child [%u] running, parent exits\n", pid);
864 /* redirect std{out,err} */
865 if (!debug && !debug_trace) {
866 dup2(fd, STDIN_FILENO);
867 dup2(fd, STDOUT_FILENO);
868 dup2(fd, STDERR_FILENO);
870 if (fd > STDERR_FILENO)
873 /* set scheduling priority for the daemon */
874 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
880 /* OOM_DISABLE == -17 */
881 fd = open("/proc/self/oom_adj", O_RDWR);
883 err(udev, "error disabling OOM: %m\n");
891 /* set signal handlers */
892 memset(&act, 0x00, sizeof(struct sigaction));
893 act.sa_handler = sig_handler;
894 sigemptyset(&act.sa_mask);
895 act.sa_flags = SA_RESTART;
896 sigaction(SIGINT, &act, NULL);
897 sigaction(SIGTERM, &act, NULL);
898 sigaction(SIGCHLD, &act, NULL);
899 sigaction(SIGHUP, &act, NULL);
901 /* watch rules directory */
902 udev_watch_init(udev);
903 if (inotify_fd >= 0) {
904 if (udev_get_rules_path(udev) != NULL) {
905 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
906 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
908 char filename[UTIL_PATH_SIZE];
910 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
911 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
912 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
913 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
915 /* watch dynamic rules directory */
916 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/rules.d", NULL);
917 inotify_add_watch(inotify_fd, filename,
918 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
921 udev_watch_restore(udev);
924 /* in trace mode run one event after the other */
928 int memsize = mem_size_mb();
930 max_childs = 128 + (memsize / 4);
932 max_childs = UDEVD_MAX_CHILDS;
934 /* possibly overwrite maximum limit of executed events */
935 value = getenv("UDEVD_MAX_CHILDS");
937 max_childs = strtoul(value, NULL, 10);
938 info(udev, "initialize max_childs to %u\n", max_childs);
941 sigset_t blocked_mask, orig_mask;
942 struct pollfd pfd[4];
943 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
947 sigfillset(&blocked_mask);
948 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
949 if (signal_received) {
950 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
954 ctrl_poll = &pfd[nfds++];
955 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
956 ctrl_poll->events = POLLIN;
958 monitor_poll = &pfd[nfds++];
959 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
960 monitor_poll->events = POLLIN;
962 if (inotify_fd >= 0) {
963 inotify_poll = &pfd[nfds++];
964 inotify_poll->fd = inotify_fd;
965 inotify_poll->events = POLLIN;
968 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
969 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
973 err(udev, "error in select: %m\n");
977 /* get control message */
978 if (ctrl_poll->revents & POLLIN)
979 handle_ctrl_msg(udev_ctrl);
981 /* get kernel uevent */
982 if (monitor_poll->revents & POLLIN) {
983 struct udev_device *dev;
985 dev = udev_monitor_receive_device(kernel_monitor);
987 struct udev_event *event;
989 event = udev_event_new(dev);
991 event_queue_insert(event);
993 udev_device_unref(dev);
997 /* rules directory inotify watch */
998 if (inotify_poll && (inotify_poll->revents & POLLIN))
999 handle_inotify(udev);
1002 signal_received = 0;
1004 /* rules changed, set by inotify or a HUP signal */
1005 if (reload_config) {
1006 struct udev_rules *rules_new;
1009 rules_new = udev_rules_new(udev, resolve_names);
1010 if (rules_new != NULL) {
1011 udev_rules_unref(rules);
1016 if (sigchilds_waiting) {
1017 sigchilds_waiting = 0;
1024 event_queue_manager(udev);
1027 if (settle_pid > 0) {
1028 kill(settle_pid, SIGUSR1);
1032 cleanup_queue_dir(udev);
1035 udev_rules_unref(rules);
1036 udev_ctrl_unref(udev_ctrl);
1037 if (inotify_fd >= 0)
1039 udev_monitor_unref(kernel_monitor);
1040 udev_selinux_exit(udev);