2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include <sys/select.h>
35 #include <sys/ioctl.h>
37 #include <sys/inotify.h>
42 #define UDEVD_PRIORITY -4
43 #define UDEV_PRIORITY -2
45 /* maximum limit of forked childs */
46 #define UDEVD_MAX_CHILDS 256
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 void reap_sigchilds(void);
64 static int debug_trace;
65 static struct udev_rules *rules;
66 static struct udev_ctrl *udev_ctrl;
67 static struct udev_monitor *kernel_monitor;
68 static int inotify_fd = -1;
69 static volatile int sigchilds_waiting;
70 static volatile int udev_exit;
71 static volatile int reload_config;
72 static volatile int signal_received;
73 static int run_exec_q;
74 static int stop_exec_q;
75 static int max_childs;
77 static struct udev_list_node event_list;
85 static struct udev_event *node_to_event(struct udev_list_node *node)
90 event -= offsetof(struct udev_event, node);
91 return (struct udev_event *)event;
94 static void export_event_state(struct udev_event *event, enum event_state state)
96 char filename[UTIL_PATH_SIZE];
97 char filename_failed[UTIL_PATH_SIZE];
100 /* location of queue file */
101 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
102 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
104 /* location of failed file */
105 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
106 util_strlcat(filename_failed, "/", sizeof(filename_failed));
107 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
108 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
109 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
113 if(unlink(filename_failed) == 0)
114 util_delete_path(event->udev, filename_failed);
115 util_create_path(event->udev, filename);
116 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
117 symlink(udev_device_get_devpath(event->dev), filename);
118 udev_selinux_resetfscreatecon(event->udev);
121 if (udev_device_get_devpath_old(event->dev) != NULL) {
122 /* "move" event - rename failed file to current name, do not delete failed */
123 char filename_failed_old[UTIL_PATH_SIZE];
125 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
126 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
127 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
128 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
129 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
131 if (rename(filename_failed_old, filename_failed) == 0)
132 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
133 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
135 if (unlink(filename_failed) == 0)
136 util_delete_path(event->udev, filename_failed);
141 /* clean up possibly empty queue directory */
142 if (udev_list_is_empty(&event_list))
143 util_delete_path(event->udev, filename);
146 /* move failed event to the failed directory */
147 util_create_path(event->udev, filename_failed);
148 rename(filename, filename_failed);
150 /* clean up possibly empty queue directory */
151 if (udev_list_is_empty(&event_list))
152 util_delete_path(event->udev, filename);
159 static void event_queue_delete(struct udev_event *event)
161 udev_list_node_remove(&event->node);
163 /* mark as failed, if "add" event returns non-zero */
164 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
165 export_event_state(event, EVENT_FAILED);
167 export_event_state(event, EVENT_FINISHED);
169 udev_device_unref(event->dev);
170 udev_event_unref(event);
173 static void asmlinkage event_sig_handler(int signum)
175 if (signum == SIGALRM)
179 static void event_fork(struct udev_event *event)
182 struct sigaction act;
187 fprintf(stderr, "fork %s (%llu)\n",
188 udev_device_get_syspath(event->dev),
189 udev_device_get_seqnum(event->dev));
196 udev_monitor_unref(kernel_monitor);
197 udev_ctrl_unref(udev_ctrl);
201 logging_init("udevd-event");
202 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
204 /* set signal handlers */
205 memset(&act, 0x00, sizeof(act));
206 act.sa_handler = (void (*)(int)) event_sig_handler;
207 sigemptyset (&act.sa_mask);
209 sigaction(SIGALRM, &act, NULL);
211 /* reset to default */
212 act.sa_handler = SIG_DFL;
213 sigaction(SIGINT, &act, NULL);
214 sigaction(SIGTERM, &act, NULL);
215 sigaction(SIGCHLD, &act, NULL);
216 sigaction(SIGHUP, &act, NULL);
218 /* set timeout to prevent hanging processes */
219 alarm(UDEV_EVENT_TIMEOUT);
221 /* apply rules, create node, symlinks */
222 err = udev_event_execute_rules(event, rules);
224 /* rules may change/disable the timeout */
225 if (udev_device_get_event_timeout(event->dev) >= 0)
226 alarm(udev_device_get_event_timeout(event->dev));
229 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
230 udev_event_execute_run(event);
232 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
238 err(event->udev, "fork of child failed: %m\n");
239 event_queue_delete(event);
242 /* get SIGCHLD in main loop */
243 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
244 udev_device_get_seqnum(event->dev),
246 udev_device_get_action(event->dev),
247 udev_device_get_subsystem(event->dev),
248 time(NULL) - event->queue_time);
254 static void event_queue_insert(struct udev_event *event)
256 char filename[UTIL_PATH_SIZE];
259 event->queue_time = time(NULL);
261 export_event_state(event, EVENT_QUEUED);
262 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
263 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
265 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
266 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
267 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
272 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
278 udev_list_node_append(&event->node, &event_list);
281 /* run all events with a timeout set immediately */
282 if (udev_device_get_timeout(event->dev) > 0) {
288 static int mem_size_mb(void)
292 long int memsize = -1;
294 f = fopen("/proc/meminfo", "r");
298 while (fgets(buf, sizeof(buf), f) != NULL) {
301 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
302 memsize = value / 1024;
311 static int compare_devpath(const char *running, const char *waiting)
315 while (running[i] != '\0' && running[i] == waiting[i])
318 /* identical device event found */
319 if (running[i] == '\0' && waiting[i] == '\0')
322 /* parent device event found */
323 if (running[i] == '\0' && waiting[i] == '/')
326 /* child device event found */
327 if (running[i] == '/' && waiting[i] == '\0')
330 /* no matching event */
334 /* lookup event for identical, parent, child, or physical device */
335 static int devpath_busy(struct udev_event *event)
337 struct udev_list_node *loop;
339 if (event->delaying_seqnum > 0) {
341 /* check if queue contains events we depend on */
342 udev_list_node_foreach(loop, &event_list) {
343 struct udev_event *loop_event = node_to_event(loop);
345 /* we already found a later event, earlier can not block us, no need to check again */
346 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
349 /* event we checked earlier still exists, no need to check again */
350 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
353 /* found ourself, no later event can block us */
354 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
357 /* check our old name */
358 if (udev_device_get_devpath_old(event->dev) != NULL)
359 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
360 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
364 /* check identical, parent, or child device event */
365 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
366 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
367 udev_device_get_seqnum(event->dev),
368 udev_device_get_seqnum(loop_event->dev),
369 udev_device_get_devpath(loop_event->dev));
370 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
374 /* check for our major:minor number */
375 if (major(udev_device_get_devnum(event->dev)) > 0 &&
376 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
377 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
378 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
379 udev_device_get_seqnum(event->dev),
380 udev_device_get_seqnum(loop_event->dev),
381 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
382 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
386 /* check physical device event (special case of parent) */
387 if (udev_device_get_physdevpath(event->dev) != NULL &&
388 strcmp(udev_device_get_action(event->dev), "add") == 0)
389 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
390 udev_device_get_physdevpath(event->dev)) != 0) {
391 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
392 udev_device_get_seqnum(event->dev),
393 udev_device_get_seqnum(loop_event->dev),
394 udev_device_get_devpath(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);
513 udev_ctrl_msg_unref(ctrl_msg);
516 static void asmlinkage sig_handler(int signum)
524 /* set flag, then write to pipe if needed */
525 sigchilds_waiting = 1;
535 static void udev_done(int pid, int exitstatus)
537 struct udev_list_node *loop;
539 /* find event associated with pid and delete it */
540 udev_list_node_foreach(loop, &event_list) {
541 struct udev_event *loop_event = node_to_event(loop);
543 if (loop_event->pid == pid) {
544 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
545 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
546 exitstatus, time(NULL) - loop_event->queue_time);
547 loop_event->exitstatus = exitstatus;
549 fprintf(stderr, "exit %s (%llu)\n",
550 udev_device_get_syspath(loop_event->dev),
551 udev_device_get_seqnum(loop_event->dev));
552 event_queue_delete(loop_event);
555 /* there may be dependent events waiting */
562 static void reap_sigchilds(void)
568 pid = waitpid(-1, &status, WNOHANG);
571 if (WIFEXITED(status))
572 status = WEXITSTATUS(status);
573 else if (WIFSIGNALED(status))
574 status = WTERMSIG(status) + 128;
577 udev_done(pid, status);
581 static void cleanup_queue_dir(struct udev *udev)
583 char dirname[UTIL_PATH_SIZE];
584 char filename[UTIL_PATH_SIZE];
587 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
588 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
591 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
592 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
593 dir = opendir(dirname);
599 if (dent == NULL || dent->d_name[0] == '\0')
601 if (dent->d_name[0] == '.')
603 util_strlcpy(filename, dirname, sizeof(filename));
604 util_strlcat(filename, "/", sizeof(filename));
605 util_strlcat(filename, dent->d_name, sizeof(filename));
613 static void export_initial_seqnum(struct udev *udev)
615 char filename[UTIL_PATH_SIZE];
620 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
621 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
622 fd = open(filename, O_RDONLY);
624 len = read(fd, seqnum, sizeof(seqnum)-1);
628 strcpy(seqnum, "0\n");
631 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
632 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
633 util_create_path(udev, filename);
634 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
636 write(fd, seqnum, len);
641 int main(int argc, char *argv[])
645 struct sigaction act;
648 int resolve_names = 1;
649 static const struct option options[] = {
650 { "daemon", no_argument, NULL, 'd' },
651 { "debug-trace", no_argument, NULL, 't' },
652 { "debug", no_argument, NULL, 'D' },
653 { "help", no_argument, NULL, 'h' },
654 { "version", no_argument, NULL, 'V' },
655 { "resolve-names", required_argument, NULL, 'N' },
664 logging_init("udevd");
665 udev_set_log_fn(udev, log_fn);
666 info(udev, "version %s\n", VERSION);
667 udev_selinux_init(udev);
672 option = getopt_long(argc, argv, "dDthV", options, NULL);
685 if (udev_get_log_priority(udev) < LOG_INFO)
686 udev_set_log_priority(udev, LOG_INFO);
689 if (strcmp (optarg, "early") == 0) {
691 } else if (strcmp (optarg, "late") == 0) {
693 } else if (strcmp (optarg, "never") == 0) {
696 fprintf(stderr, "resolve-names must be early, late or never\n");
697 err(udev, "resolve-names must be early, late or never\n");
702 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
703 "[--resolve-names=early|late|never] [--version]\n");
706 printf("%s\n", VERSION);
714 fprintf(stderr, "root privileges required\n");
715 err(udev, "root privileges required\n");
719 /* make sure std{in,out,err} fd's are in a sane state */
720 fd = open("/dev/null", O_RDWR);
722 fprintf(stderr, "cannot open /dev/null\n");
723 err(udev, "cannot open /dev/null\n");
725 if (write(STDOUT_FILENO, 0, 0) < 0)
726 dup2(fd, STDOUT_FILENO);
727 if (write(STDERR_FILENO, 0, 0) < 0)
728 dup2(fd, STDERR_FILENO);
730 /* init control socket, bind() ensures, that only one udevd instance is running */
731 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
732 if (udev_ctrl == NULL) {
733 fprintf(stderr, "error initializing control socket");
734 err(udev, "error initializing udevd socket");
739 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
740 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
741 err(udev, "error binding control socket, seems udevd is already running\n");
746 kernel_monitor = udev_monitor_new_from_netlink(udev);
747 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
748 fprintf(stderr, "error initializing netlink socket\n");
749 err(udev, "error initializing netlink socket\n");
753 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
755 rules = udev_rules_new(udev, resolve_names);
757 err(udev, "error reading rules\n");
760 udev_list_init(&event_list);
761 cleanup_queue_dir(udev);
762 export_initial_seqnum(udev);
770 dbg(udev, "daemonized fork running\n");
773 err(udev, "fork of daemon failed: %m\n");
777 dbg(udev, "child [%u] running, parent exits\n", pid);
783 /* redirect std{out,err} */
784 if (!debug && !debug_trace) {
785 dup2(fd, STDIN_FILENO);
786 dup2(fd, STDOUT_FILENO);
787 dup2(fd, STDERR_FILENO);
789 if (fd > STDERR_FILENO)
792 /* set scheduling priority for the daemon */
793 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
799 /* OOM_DISABLE == -17 */
800 fd = open("/proc/self/oom_adj", O_RDWR);
802 err(udev, "error disabling OOM: %m\n");
808 fd = open("/dev/kmsg", O_WRONLY);
810 const char *ver_str = "<6>udev: starting version " VERSION "\n";
811 char path[UTIL_PATH_SIZE];
814 write(fd, ver_str, strlen(ver_str));
815 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
816 util_strlcat(path, "/class/mem/null", sizeof(path));
817 if (lstat(path, &statbuf) == 0) {
818 if (S_ISDIR(statbuf.st_mode)) {
819 const char *depr_str =
820 "<6>udev: deprecated sysfs layout; update the kernel or "
821 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
822 "not work correctly\n";
824 write(fd, depr_str, strlen(depr_str));
830 /* set signal handlers */
831 memset(&act, 0x00, sizeof(struct sigaction));
832 act.sa_handler = (void (*)(int)) sig_handler;
833 sigemptyset(&act.sa_mask);
834 act.sa_flags = SA_RESTART;
835 sigaction(SIGINT, &act, NULL);
836 sigaction(SIGTERM, &act, NULL);
837 sigaction(SIGCHLD, &act, NULL);
838 sigaction(SIGHUP, &act, NULL);
840 /* watch rules directory */
841 inotify_fd = inotify_init();
842 if (inotify_fd >= 0) {
843 if (udev_get_rules_path(udev) != NULL) {
844 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
845 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
847 char filename[UTIL_PATH_SIZE];
849 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
850 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
851 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
852 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
854 /* watch dynamic rules directory */
855 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
856 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
857 inotify_add_watch(inotify_fd, filename,
858 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
860 } else if (errno == ENOSYS)
861 info(udev, "unable to use inotify, udevd will not monitor rule files changes\n");
863 err(udev, "inotify_init failed: %m\n");
865 /* in trace mode run one event after the other */
869 int memsize = mem_size_mb();
871 max_childs = 128 + (memsize / 4);
873 max_childs = UDEVD_MAX_CHILDS;
875 /* possibly overwrite maximum limit of executed events */
876 value = getenv("UDEVD_MAX_CHILDS");
878 max_childs = strtoul(value, NULL, 10);
879 info(udev, "initialize max_childs to %u\n", max_childs);
882 sigset_t blocked_mask, orig_mask;
883 struct pollfd pfd[4];
884 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
888 sigfillset(&blocked_mask);
889 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
890 if (signal_received) {
891 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
895 ctrl_poll = &pfd[nfds++];
896 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
897 ctrl_poll->events = POLLIN;
899 monitor_poll = &pfd[nfds++];
900 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
901 monitor_poll->events = POLLIN;
903 if (inotify_fd >= 0) {
904 inotify_poll = &pfd[nfds++];
905 inotify_poll->fd = inotify_fd;
906 inotify_poll->events = POLLIN;
909 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
910 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
914 err(udev, "error in select: %m\n");
918 /* get control message */
919 if (ctrl_poll->revents & POLLIN)
920 handle_ctrl_msg(udev_ctrl);
922 /* get kernel uevent */
923 if (monitor_poll->revents & POLLIN) {
924 struct udev_device *dev;
926 dev = udev_monitor_receive_device(kernel_monitor);
928 struct udev_event *event;
930 event = udev_event_new(dev);
932 event_queue_insert(event);
934 udev_device_unref(dev);
938 /* rules directory inotify watch */
939 if (inotify_poll && (inotify_poll->revents & POLLIN)) {
942 /* discard all possible events, we can just reload the config */
943 if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
947 buf = malloc(nbytes);
949 err(udev, "error getting buffer for inotify, disable watching\n");
953 read(inotify_fd, buf, nbytes);
961 /* rules changed, set by inotify or a HUP signal */
963 struct udev_rules *rules_new;
966 rules_new = udev_rules_new(udev, resolve_names);
967 if (rules_new != NULL) {
968 udev_rules_unref(rules);
973 if (sigchilds_waiting) {
974 sigchilds_waiting = 0;
981 event_queue_manager(udev);
984 cleanup_queue_dir(udev);
987 udev_rules_unref(rules);
988 udev_ctrl_unref(udev_ctrl);
991 udev_monitor_unref(kernel_monitor);
992 udev_selinux_exit(udev);