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 volatile int sigchilds_waiting;
69 static volatile int udev_exit;
70 static volatile int reload_config;
71 static volatile int signal_received;
72 static int run_exec_q;
73 static int stop_exec_q;
74 static int max_childs;
76 static struct udev_list_node event_list;
84 static struct udev_event *node_to_event(struct udev_list_node *node)
89 event -= offsetof(struct udev_event, node);
90 return (struct udev_event *)event;
93 static void export_event_state(struct udev_event *event, enum event_state state)
95 char filename[UTIL_PATH_SIZE];
96 char filename_failed[UTIL_PATH_SIZE];
99 /* location of queue file */
100 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
101 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
103 /* location of failed file */
104 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
105 util_strlcat(filename_failed, "/", sizeof(filename_failed));
106 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
107 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
108 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
112 if(unlink(filename_failed) == 0)
113 util_delete_path(event->udev, filename_failed);
114 util_create_path(event->udev, filename);
115 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
116 symlink(udev_device_get_devpath(event->dev), filename);
117 udev_selinux_resetfscreatecon(event->udev);
120 if (udev_device_get_devpath_old(event->dev) != NULL) {
121 /* "move" event - rename failed file to current name, do not delete failed */
122 char filename_failed_old[UTIL_PATH_SIZE];
124 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
125 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
126 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
127 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
128 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
130 if (rename(filename_failed_old, filename_failed) == 0)
131 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
132 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
134 if (unlink(filename_failed) == 0)
135 util_delete_path(event->udev, filename_failed);
140 /* clean up possibly empty queue directory */
141 if (udev_list_is_empty(&event_list))
142 util_delete_path(event->udev, filename);
145 /* move failed event to the failed directory */
146 util_create_path(event->udev, filename_failed);
147 rename(filename, filename_failed);
149 /* clean up possibly empty queue directory */
150 if (udev_list_is_empty(&event_list))
151 util_delete_path(event->udev, filename);
158 static void event_queue_delete(struct udev_event *event)
160 udev_list_node_remove(&event->node);
162 /* mark as failed, if "add" event returns non-zero */
163 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
164 export_event_state(event, EVENT_FAILED);
166 export_event_state(event, EVENT_FINISHED);
168 udev_device_unref(event->dev);
169 udev_event_unref(event);
172 static void asmlinkage event_sig_handler(int signum)
174 if (signum == SIGALRM)
178 static void event_fork(struct udev_event *event)
181 struct sigaction act;
186 fprintf(stderr, "fork %s (%llu)\n",
187 udev_device_get_syspath(event->dev),
188 udev_device_get_seqnum(event->dev));
195 udev_monitor_unref(kernel_monitor);
196 udev_ctrl_unref(udev_ctrl);
198 logging_init("udevd-event");
199 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
201 /* set signal handlers */
202 memset(&act, 0x00, sizeof(act));
203 act.sa_handler = (void (*)(int)) event_sig_handler;
204 sigemptyset (&act.sa_mask);
206 sigaction(SIGALRM, &act, NULL);
208 /* reset to default */
209 act.sa_handler = SIG_DFL;
210 sigaction(SIGINT, &act, NULL);
211 sigaction(SIGTERM, &act, NULL);
212 sigaction(SIGCHLD, &act, NULL);
213 sigaction(SIGHUP, &act, NULL);
215 /* set timeout to prevent hanging processes */
216 alarm(UDEV_EVENT_TIMEOUT);
218 /* clear any existing udev watch on the node */
219 if (inotify_fd != -1) {
220 struct udev_device *dev_old;
222 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(event->dev));
223 if (dev_old != NULL) {
224 udev_watch_end(event->udev, dev_old);
225 udev_device_unref(dev_old);
229 /* apply rules, create node, symlinks */
230 err = udev_event_execute_rules(event, rules);
232 /* rules may change/disable the timeout */
233 if (udev_device_get_event_timeout(event->dev) >= 0)
234 alarm(udev_device_get_event_timeout(event->dev));
237 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
238 udev_event_execute_run(event);
240 /* apply/restore inotify watch */
241 if (err == 0 && event->inotify_watch &&
242 strcmp(udev_device_get_action(event->dev), "remove") != 0)
243 udev_watch_begin(event->udev, event->dev);
245 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
251 err(event->udev, "fork of child failed: %m\n");
252 event_queue_delete(event);
255 /* get SIGCHLD in main loop */
256 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
257 udev_device_get_seqnum(event->dev),
259 udev_device_get_action(event->dev),
260 udev_device_get_subsystem(event->dev),
261 time(NULL) - event->queue_time);
267 static void event_queue_insert(struct udev_event *event)
269 char filename[UTIL_PATH_SIZE];
272 event->queue_time = time(NULL);
274 export_event_state(event, EVENT_QUEUED);
275 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
276 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
278 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
279 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
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, or physical 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);
399 /* check physical device event (special case of parent) */
400 if (udev_device_get_physdevpath(event->dev) != NULL &&
401 strcmp(udev_device_get_action(event->dev), "add") == 0)
402 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
403 udev_device_get_physdevpath(event->dev)) != 0) {
404 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
405 udev_device_get_seqnum(event->dev),
406 udev_device_get_seqnum(loop_event->dev),
407 udev_device_get_devpath(loop_event->dev));
408 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
415 /* serializes events for the identical and parent and child devices */
416 static void event_queue_manager(struct udev *udev)
418 struct udev_list_node *loop;
419 struct udev_list_node *tmp;
422 if (udev_list_is_empty(&event_list)) {
424 err(udev, "event list empty, but childs count is %i", childs);
430 udev_list_node_foreach_safe(loop, tmp, &event_list) {
431 struct udev_event *loop_event = node_to_event(loop);
433 if (childs >= max_childs) {
434 info(udev, "maximum number (%i) of childs reached\n", childs);
438 if (loop_event->pid != 0)
441 /* do not start event if parent or child event is still running */
442 if (devpath_busy(loop_event) != 0) {
443 dbg(udev, "delay seq %llu (%s)\n",
444 udev_device_get_seqnum(loop_event->dev),
445 udev_device_get_devpath(loop_event->dev));
449 event_fork(loop_event);
450 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
452 /* retry if events finished in the meantime */
453 if (sigchilds_waiting) {
454 sigchilds_waiting = 0;
461 /* receive the udevd message from userspace */
462 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
464 struct udev *udev = udev_ctrl_get_udev(uctrl);
465 struct udev_ctrl_msg *ctrl_msg;
469 ctrl_msg = udev_ctrl_receive_msg(uctrl);
470 if (ctrl_msg == NULL)
473 i = udev_ctrl_get_set_log_level(ctrl_msg);
475 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
476 udev_set_log_priority(udev, i);
479 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
480 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
484 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
485 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
487 event_queue_manager(udev);
490 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
491 info(udev, "udevd message (RELOAD_RULES) received\n");
495 str = udev_ctrl_get_set_env(ctrl_msg);
503 val = strchr(key, '=');
507 if (val[0] == '\0') {
508 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
509 udev_add_property(udev, key, NULL);
511 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
512 udev_add_property(udev, key, val);
515 err(udev, "wrong key format '%s'\n", key);
521 i = udev_ctrl_get_set_max_childs(ctrl_msg);
523 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
526 udev_ctrl_msg_unref(ctrl_msg);
529 /* read inotify messages */
530 static int handle_inotify(struct udev *udev)
534 struct inotify_event *ev;
536 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
539 buf = malloc(nbytes);
541 err(udev, "error getting buffer for inotify, disable watching\n");
547 read(inotify_fd, buf, nbytes);
549 for (pos = 0, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
550 struct udev_device *dev;
553 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
558 dev = udev_watch_lookup(udev, ev->wd);
560 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
561 if (ev->mask & IN_CLOSE_WRITE) {
562 char filename[UTIL_PATH_SIZE];
565 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
566 util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
567 util_strlcat(filename, "/uevent", sizeof(filename));
568 fd = open(filename, O_WRONLY);
569 if (fd < 0 || write(fd, "change", 6) < 0)
570 info(udev, "error writing uevent: %m\n");
573 if (ev->mask & IN_IGNORED)
574 udev_watch_end(udev, dev);
576 udev_device_unref(dev);
585 static void asmlinkage sig_handler(int signum)
593 /* set flag, then write to pipe if needed */
594 sigchilds_waiting = 1;
604 static void udev_done(int pid, int exitstatus)
606 struct udev_list_node *loop;
608 /* find event associated with pid and delete it */
609 udev_list_node_foreach(loop, &event_list) {
610 struct udev_event *loop_event = node_to_event(loop);
612 if (loop_event->pid == pid) {
613 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
614 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
615 exitstatus, time(NULL) - loop_event->queue_time);
616 loop_event->exitstatus = exitstatus;
618 fprintf(stderr, "exit %s (%llu)\n",
619 udev_device_get_syspath(loop_event->dev),
620 udev_device_get_seqnum(loop_event->dev));
621 event_queue_delete(loop_event);
624 /* there may be dependent events waiting */
631 static void reap_sigchilds(void)
637 pid = waitpid(-1, &status, WNOHANG);
640 if (WIFEXITED(status))
641 status = WEXITSTATUS(status);
642 else if (WIFSIGNALED(status))
643 status = WTERMSIG(status) + 128;
646 udev_done(pid, status);
650 static void cleanup_queue_dir(struct udev *udev)
652 char dirname[UTIL_PATH_SIZE];
653 char filename[UTIL_PATH_SIZE];
656 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
657 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
660 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
661 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
662 dir = opendir(dirname);
668 if (dent == NULL || dent->d_name[0] == '\0')
670 if (dent->d_name[0] == '.')
672 util_strlcpy(filename, dirname, sizeof(filename));
673 util_strlcat(filename, "/", sizeof(filename));
674 util_strlcat(filename, dent->d_name, sizeof(filename));
682 static void export_initial_seqnum(struct udev *udev)
684 char filename[UTIL_PATH_SIZE];
689 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
690 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
691 fd = open(filename, O_RDONLY);
693 len = read(fd, seqnum, sizeof(seqnum)-1);
697 strcpy(seqnum, "0\n");
700 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
701 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
702 util_create_path(udev, filename);
703 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
705 write(fd, seqnum, len);
710 int main(int argc, char *argv[])
714 struct sigaction act;
717 int resolve_names = 1;
718 static const struct option options[] = {
719 { "daemon", no_argument, NULL, 'd' },
720 { "debug-trace", no_argument, NULL, 't' },
721 { "debug", no_argument, NULL, 'D' },
722 { "help", no_argument, NULL, 'h' },
723 { "version", no_argument, NULL, 'V' },
724 { "resolve-names", required_argument, NULL, 'N' },
733 logging_init("udevd");
734 udev_set_log_fn(udev, log_fn);
735 info(udev, "version %s\n", VERSION);
736 udev_selinux_init(udev);
741 option = getopt_long(argc, argv, "dDthV", options, NULL);
754 if (udev_get_log_priority(udev) < LOG_INFO)
755 udev_set_log_priority(udev, LOG_INFO);
758 if (strcmp (optarg, "early") == 0) {
760 } else if (strcmp (optarg, "late") == 0) {
762 } else if (strcmp (optarg, "never") == 0) {
765 fprintf(stderr, "resolve-names must be early, late or never\n");
766 err(udev, "resolve-names must be early, late or never\n");
771 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
772 "[--resolve-names=early|late|never] [--version]\n");
775 printf("%s\n", VERSION);
783 fprintf(stderr, "root privileges required\n");
784 err(udev, "root privileges required\n");
788 /* make sure std{in,out,err} fd's are in a sane state */
789 fd = open("/dev/null", O_RDWR);
791 fprintf(stderr, "cannot open /dev/null\n");
792 err(udev, "cannot open /dev/null\n");
794 if (write(STDOUT_FILENO, 0, 0) < 0)
795 dup2(fd, STDOUT_FILENO);
796 if (write(STDERR_FILENO, 0, 0) < 0)
797 dup2(fd, STDERR_FILENO);
799 /* init control socket, bind() ensures, that only one udevd instance is running */
800 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
801 if (udev_ctrl == NULL) {
802 fprintf(stderr, "error initializing control socket");
803 err(udev, "error initializing udevd socket");
808 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
809 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
810 err(udev, "error binding control socket, seems udevd is already running\n");
815 kernel_monitor = udev_monitor_new_from_netlink(udev);
816 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
817 fprintf(stderr, "error initializing netlink socket\n");
818 err(udev, "error initializing netlink socket\n");
822 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
824 rules = udev_rules_new(udev, resolve_names);
826 err(udev, "error reading rules\n");
829 udev_list_init(&event_list);
830 cleanup_queue_dir(udev);
831 export_initial_seqnum(udev);
839 dbg(udev, "daemonized fork running\n");
842 err(udev, "fork of daemon failed: %m\n");
846 dbg(udev, "child [%u] running, parent exits\n", pid);
852 /* redirect std{out,err} */
853 if (!debug && !debug_trace) {
854 dup2(fd, STDIN_FILENO);
855 dup2(fd, STDOUT_FILENO);
856 dup2(fd, STDERR_FILENO);
858 if (fd > STDERR_FILENO)
861 /* set scheduling priority for the daemon */
862 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
868 /* OOM_DISABLE == -17 */
869 fd = open("/proc/self/oom_adj", O_RDWR);
871 err(udev, "error disabling OOM: %m\n");
877 fd = open("/dev/kmsg", O_WRONLY);
879 const char *ver_str = "<6>udev: starting version " VERSION "\n";
880 char path[UTIL_PATH_SIZE];
883 write(fd, ver_str, strlen(ver_str));
884 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
885 util_strlcat(path, "/class/mem/null", sizeof(path));
886 if (lstat(path, &statbuf) == 0) {
887 if (S_ISDIR(statbuf.st_mode)) {
888 const char *depr_str =
889 "<6>udev: deprecated sysfs layout; update the kernel or "
890 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
891 "not work correctly\n";
893 write(fd, depr_str, strlen(depr_str));
899 /* set signal handlers */
900 memset(&act, 0x00, sizeof(struct sigaction));
901 act.sa_handler = (void (*)(int)) sig_handler;
902 sigemptyset(&act.sa_mask);
903 act.sa_flags = SA_RESTART;
904 sigaction(SIGINT, &act, NULL);
905 sigaction(SIGTERM, &act, NULL);
906 sigaction(SIGCHLD, &act, NULL);
907 sigaction(SIGHUP, &act, NULL);
909 /* watch rules directory */
910 udev_watch_init(udev);
911 if (inotify_fd >= 0) {
912 if (udev_get_rules_path(udev) != NULL) {
913 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
914 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
916 char filename[UTIL_PATH_SIZE];
918 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
919 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
920 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
921 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
923 /* watch dynamic rules directory */
924 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
925 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
926 inotify_add_watch(inotify_fd, filename,
927 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
930 udev_watch_restore(udev);
933 /* in trace mode run one event after the other */
937 int memsize = mem_size_mb();
939 max_childs = 128 + (memsize / 4);
941 max_childs = UDEVD_MAX_CHILDS;
943 /* possibly overwrite maximum limit of executed events */
944 value = getenv("UDEVD_MAX_CHILDS");
946 max_childs = strtoul(value, NULL, 10);
947 info(udev, "initialize max_childs to %u\n", max_childs);
950 sigset_t blocked_mask, orig_mask;
951 struct pollfd pfd[4];
952 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
956 sigfillset(&blocked_mask);
957 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
958 if (signal_received) {
959 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
963 ctrl_poll = &pfd[nfds++];
964 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
965 ctrl_poll->events = POLLIN;
967 monitor_poll = &pfd[nfds++];
968 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
969 monitor_poll->events = POLLIN;
971 if (inotify_fd >= 0) {
972 inotify_poll = &pfd[nfds++];
973 inotify_poll->fd = inotify_fd;
974 inotify_poll->events = POLLIN;
977 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
978 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
982 err(udev, "error in select: %m\n");
986 /* get control message */
987 if (ctrl_poll->revents & POLLIN)
988 handle_ctrl_msg(udev_ctrl);
990 /* get kernel uevent */
991 if (monitor_poll->revents & POLLIN) {
992 struct udev_device *dev;
994 dev = udev_monitor_receive_device(kernel_monitor);
996 struct udev_event *event;
998 event = udev_event_new(dev);
1000 event_queue_insert(event);
1002 udev_device_unref(dev);
1006 /* rules directory inotify watch */
1007 if (inotify_poll && (inotify_poll->revents & POLLIN))
1008 handle_inotify(udev);
1011 signal_received = 0;
1013 /* rules changed, set by inotify or a HUP signal */
1014 if (reload_config) {
1015 struct udev_rules *rules_new;
1018 rules_new = udev_rules_new(udev, resolve_names);
1019 if (rules_new != NULL) {
1020 udev_rules_unref(rules);
1025 if (sigchilds_waiting) {
1026 sigchilds_waiting = 0;
1033 event_queue_manager(udev);
1036 cleanup_queue_dir(udev);
1039 udev_rules_unref(rules);
1040 udev_ctrl_unref(udev_ctrl);
1041 if (inotify_fd >= 0)
1043 udev_monitor_unref(kernel_monitor);
1044 udev_selinux_exit(udev);