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 udev_watch_end(event->udev, event->dev);
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 /* apply/restore inotify watch */
233 if (err == 0 && event->inotify_watch &&
234 strcmp(udev_device_get_action(event->dev), "remove") != 0)
235 udev_watch_begin(event->udev, event->dev);
237 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
243 err(event->udev, "fork of child failed: %m\n");
244 event_queue_delete(event);
247 /* get SIGCHLD in main loop */
248 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
249 udev_device_get_seqnum(event->dev),
251 udev_device_get_action(event->dev),
252 udev_device_get_subsystem(event->dev),
253 time(NULL) - event->queue_time);
259 static void event_queue_insert(struct udev_event *event)
261 char filename[UTIL_PATH_SIZE];
264 event->queue_time = time(NULL);
266 export_event_state(event, EVENT_QUEUED);
267 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
268 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
270 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
271 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
272 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
277 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
283 udev_list_node_append(&event->node, &event_list);
286 /* run all events with a timeout set immediately */
287 if (udev_device_get_timeout(event->dev) > 0) {
293 static int mem_size_mb(void)
297 long int memsize = -1;
299 f = fopen("/proc/meminfo", "r");
303 while (fgets(buf, sizeof(buf), f) != NULL) {
306 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
307 memsize = value / 1024;
316 static int compare_devpath(const char *running, const char *waiting)
320 while (running[i] != '\0' && running[i] == waiting[i])
323 /* identical device event found */
324 if (running[i] == '\0' && waiting[i] == '\0')
327 /* parent device event found */
328 if (running[i] == '\0' && waiting[i] == '/')
331 /* child device event found */
332 if (running[i] == '/' && waiting[i] == '\0')
335 /* no matching event */
339 /* lookup event for identical, parent, child, or physical device */
340 static int devpath_busy(struct udev_event *event)
342 struct udev_list_node *loop;
344 if (event->delaying_seqnum > 0) {
346 /* check if queue contains events we depend on */
347 udev_list_node_foreach(loop, &event_list) {
348 struct udev_event *loop_event = node_to_event(loop);
350 /* we already found a later event, earlier can not block us, no need to check again */
351 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
354 /* event we checked earlier still exists, no need to check again */
355 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
358 /* found ourself, no later event can block us */
359 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
362 /* check our old name */
363 if (udev_device_get_devpath_old(event->dev) != NULL)
364 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
365 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
369 /* check identical, parent, or child device event */
370 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
371 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
372 udev_device_get_seqnum(event->dev),
373 udev_device_get_seqnum(loop_event->dev),
374 udev_device_get_devpath(loop_event->dev));
375 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
379 /* check for our major:minor number */
380 if (major(udev_device_get_devnum(event->dev)) > 0 &&
381 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
382 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
383 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
384 udev_device_get_seqnum(event->dev),
385 udev_device_get_seqnum(loop_event->dev),
386 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
387 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
391 /* check physical device event (special case of parent) */
392 if (udev_device_get_physdevpath(event->dev) != NULL &&
393 strcmp(udev_device_get_action(event->dev), "add") == 0)
394 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
395 udev_device_get_physdevpath(event->dev)) != 0) {
396 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
397 udev_device_get_seqnum(event->dev),
398 udev_device_get_seqnum(loop_event->dev),
399 udev_device_get_devpath(loop_event->dev));
400 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
407 /* serializes events for the identical and parent and child devices */
408 static void event_queue_manager(struct udev *udev)
410 struct udev_list_node *loop;
411 struct udev_list_node *tmp;
414 if (udev_list_is_empty(&event_list)) {
416 err(udev, "event list empty, but childs count is %i", childs);
422 udev_list_node_foreach_safe(loop, tmp, &event_list) {
423 struct udev_event *loop_event = node_to_event(loop);
425 if (childs >= max_childs) {
426 info(udev, "maximum number (%i) of childs reached\n", childs);
430 if (loop_event->pid != 0)
433 /* do not start event if parent or child event is still running */
434 if (devpath_busy(loop_event) != 0) {
435 dbg(udev, "delay seq %llu (%s)\n",
436 udev_device_get_seqnum(loop_event->dev),
437 udev_device_get_devpath(loop_event->dev));
441 event_fork(loop_event);
442 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
444 /* retry if events finished in the meantime */
445 if (sigchilds_waiting) {
446 sigchilds_waiting = 0;
453 /* receive the udevd message from userspace */
454 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
456 struct udev *udev = udev_ctrl_get_udev(uctrl);
457 struct udev_ctrl_msg *ctrl_msg;
461 ctrl_msg = udev_ctrl_receive_msg(uctrl);
462 if (ctrl_msg == NULL)
465 i = udev_ctrl_get_set_log_level(ctrl_msg);
467 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
468 udev_set_log_priority(udev, i);
471 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
472 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
476 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
477 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
479 event_queue_manager(udev);
482 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
483 info(udev, "udevd message (RELOAD_RULES) received\n");
487 str = udev_ctrl_get_set_env(ctrl_msg);
495 val = strchr(key, '=');
499 if (val[0] == '\0') {
500 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
501 udev_add_property(udev, key, NULL);
503 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
504 udev_add_property(udev, key, val);
507 err(udev, "wrong key format '%s'\n", key);
513 i = udev_ctrl_get_set_max_childs(ctrl_msg);
515 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
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, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
542 struct udev_device *dev;
544 dbg(udev, "inotify event: %x for %d (%s)\n", ev->mask, ev->wd, ev->len ? ev->name : "*");
545 dev = udev_watch_lookup(udev, ev->wd);
547 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
548 if (ev->mask & IN_CLOSE_WRITE) {
549 char filename[UTIL_PATH_SIZE];
552 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
553 util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
554 util_strlcat(filename, "/uevent", sizeof(filename));
555 fd = open(filename, O_WRONLY);
556 if (fd < 0 || write(fd, "change", 6) < 0)
557 info(udev, "error writing uevent: %m\n");
560 if (ev->mask & IN_IGNORED)
561 udev_watch_end(udev, dev);
563 udev_device_unref(dev);
573 static void asmlinkage sig_handler(int signum)
581 /* set flag, then write to pipe if needed */
582 sigchilds_waiting = 1;
592 static void udev_done(int pid, int exitstatus)
594 struct udev_list_node *loop;
596 /* find event associated with pid and delete it */
597 udev_list_node_foreach(loop, &event_list) {
598 struct udev_event *loop_event = node_to_event(loop);
600 if (loop_event->pid == pid) {
601 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
602 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
603 exitstatus, time(NULL) - loop_event->queue_time);
604 loop_event->exitstatus = exitstatus;
606 fprintf(stderr, "exit %s (%llu)\n",
607 udev_device_get_syspath(loop_event->dev),
608 udev_device_get_seqnum(loop_event->dev));
609 event_queue_delete(loop_event);
612 /* there may be dependent events waiting */
619 static void reap_sigchilds(void)
625 pid = waitpid(-1, &status, WNOHANG);
628 if (WIFEXITED(status))
629 status = WEXITSTATUS(status);
630 else if (WIFSIGNALED(status))
631 status = WTERMSIG(status) + 128;
634 udev_done(pid, status);
638 static void cleanup_queue_dir(struct udev *udev)
640 char dirname[UTIL_PATH_SIZE];
641 char filename[UTIL_PATH_SIZE];
644 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
645 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
648 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
649 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
650 dir = opendir(dirname);
656 if (dent == NULL || dent->d_name[0] == '\0')
658 if (dent->d_name[0] == '.')
660 util_strlcpy(filename, dirname, sizeof(filename));
661 util_strlcat(filename, "/", sizeof(filename));
662 util_strlcat(filename, dent->d_name, sizeof(filename));
670 static void export_initial_seqnum(struct udev *udev)
672 char filename[UTIL_PATH_SIZE];
677 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
678 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
679 fd = open(filename, O_RDONLY);
681 len = read(fd, seqnum, sizeof(seqnum)-1);
685 strcpy(seqnum, "0\n");
688 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
689 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
690 util_create_path(udev, filename);
691 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
693 write(fd, seqnum, len);
698 int main(int argc, char *argv[])
702 struct sigaction act;
705 int resolve_names = 1;
706 static const struct option options[] = {
707 { "daemon", no_argument, NULL, 'd' },
708 { "debug-trace", no_argument, NULL, 't' },
709 { "debug", no_argument, NULL, 'D' },
710 { "help", no_argument, NULL, 'h' },
711 { "version", no_argument, NULL, 'V' },
712 { "resolve-names", required_argument, NULL, 'N' },
721 logging_init("udevd");
722 udev_set_log_fn(udev, log_fn);
723 info(udev, "version %s\n", VERSION);
724 udev_selinux_init(udev);
729 option = getopt_long(argc, argv, "dDthV", options, NULL);
742 if (udev_get_log_priority(udev) < LOG_INFO)
743 udev_set_log_priority(udev, LOG_INFO);
746 if (strcmp (optarg, "early") == 0) {
748 } else if (strcmp (optarg, "late") == 0) {
750 } else if (strcmp (optarg, "never") == 0) {
753 fprintf(stderr, "resolve-names must be early, late or never\n");
754 err(udev, "resolve-names must be early, late or never\n");
759 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
760 "[--resolve-names=early|late|never] [--version]\n");
763 printf("%s\n", VERSION);
771 fprintf(stderr, "root privileges required\n");
772 err(udev, "root privileges required\n");
776 /* make sure std{in,out,err} fd's are in a sane state */
777 fd = open("/dev/null", O_RDWR);
779 fprintf(stderr, "cannot open /dev/null\n");
780 err(udev, "cannot open /dev/null\n");
782 if (write(STDOUT_FILENO, 0, 0) < 0)
783 dup2(fd, STDOUT_FILENO);
784 if (write(STDERR_FILENO, 0, 0) < 0)
785 dup2(fd, STDERR_FILENO);
787 /* init control socket, bind() ensures, that only one udevd instance is running */
788 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
789 if (udev_ctrl == NULL) {
790 fprintf(stderr, "error initializing control socket");
791 err(udev, "error initializing udevd socket");
796 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
797 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
798 err(udev, "error binding control socket, seems udevd is already running\n");
803 kernel_monitor = udev_monitor_new_from_netlink(udev);
804 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
805 fprintf(stderr, "error initializing netlink socket\n");
806 err(udev, "error initializing netlink socket\n");
810 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
812 rules = udev_rules_new(udev, resolve_names);
814 err(udev, "error reading rules\n");
817 udev_list_init(&event_list);
818 cleanup_queue_dir(udev);
819 export_initial_seqnum(udev);
827 dbg(udev, "daemonized fork running\n");
830 err(udev, "fork of daemon failed: %m\n");
834 dbg(udev, "child [%u] running, parent exits\n", pid);
840 /* redirect std{out,err} */
841 if (!debug && !debug_trace) {
842 dup2(fd, STDIN_FILENO);
843 dup2(fd, STDOUT_FILENO);
844 dup2(fd, STDERR_FILENO);
846 if (fd > STDERR_FILENO)
849 /* set scheduling priority for the daemon */
850 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
856 /* OOM_DISABLE == -17 */
857 fd = open("/proc/self/oom_adj", O_RDWR);
859 err(udev, "error disabling OOM: %m\n");
865 fd = open("/dev/kmsg", O_WRONLY);
867 const char *ver_str = "<6>udev: starting version " VERSION "\n";
868 char path[UTIL_PATH_SIZE];
871 write(fd, ver_str, strlen(ver_str));
872 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
873 util_strlcat(path, "/class/mem/null", sizeof(path));
874 if (lstat(path, &statbuf) == 0) {
875 if (S_ISDIR(statbuf.st_mode)) {
876 const char *depr_str =
877 "<6>udev: deprecated sysfs layout; update the kernel or "
878 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
879 "not work correctly\n";
881 write(fd, depr_str, strlen(depr_str));
887 /* set signal handlers */
888 memset(&act, 0x00, sizeof(struct sigaction));
889 act.sa_handler = (void (*)(int)) sig_handler;
890 sigemptyset(&act.sa_mask);
891 act.sa_flags = SA_RESTART;
892 sigaction(SIGINT, &act, NULL);
893 sigaction(SIGTERM, &act, NULL);
894 sigaction(SIGCHLD, &act, NULL);
895 sigaction(SIGHUP, &act, NULL);
897 /* watch rules directory */
898 udev_watch_init(udev);
899 if (inotify_fd >= 0) {
900 if (udev_get_rules_path(udev) != NULL) {
901 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
902 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
904 char filename[UTIL_PATH_SIZE];
906 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
907 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
908 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
909 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
911 /* watch dynamic rules directory */
912 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
913 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
914 inotify_add_watch(inotify_fd, filename,
915 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
918 udev_watch_restore(udev);
921 /* in trace mode run one event after the other */
925 int memsize = mem_size_mb();
927 max_childs = 128 + (memsize / 4);
929 max_childs = UDEVD_MAX_CHILDS;
931 /* possibly overwrite maximum limit of executed events */
932 value = getenv("UDEVD_MAX_CHILDS");
934 max_childs = strtoul(value, NULL, 10);
935 info(udev, "initialize max_childs to %u\n", max_childs);
938 sigset_t blocked_mask, orig_mask;
939 struct pollfd pfd[4];
940 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
944 sigfillset(&blocked_mask);
945 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
946 if (signal_received) {
947 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
951 ctrl_poll = &pfd[nfds++];
952 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
953 ctrl_poll->events = POLLIN;
955 monitor_poll = &pfd[nfds++];
956 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
957 monitor_poll->events = POLLIN;
959 if (inotify_fd >= 0) {
960 inotify_poll = &pfd[nfds++];
961 inotify_poll->fd = inotify_fd;
962 inotify_poll->events = POLLIN;
965 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
966 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
970 err(udev, "error in select: %m\n");
974 /* get control message */
975 if (ctrl_poll->revents & POLLIN)
976 handle_ctrl_msg(udev_ctrl);
978 /* get kernel uevent */
979 if (monitor_poll->revents & POLLIN) {
980 struct udev_device *dev;
982 dev = udev_monitor_receive_device(kernel_monitor);
984 struct udev_event *event;
986 event = udev_event_new(dev);
988 event_queue_insert(event);
990 udev_device_unref(dev);
994 /* rules directory inotify watch */
995 if (inotify_poll && (inotify_poll->revents & POLLIN))
996 handle_inotify(udev);
1001 /* rules changed, set by inotify or a HUP signal */
1002 if (reload_config) {
1003 struct udev_rules *rules_new;
1006 rules_new = udev_rules_new(udev, resolve_names);
1007 if (rules_new != NULL) {
1008 udev_rules_unref(rules);
1013 if (sigchilds_waiting) {
1014 sigchilds_waiting = 0;
1021 event_queue_manager(udev);
1024 cleanup_queue_dir(udev);
1027 udev_rules_unref(rules);
1028 udev_ctrl_unref(udev_ctrl);
1029 if (inotify_fd >= 0)
1031 udev_monitor_unref(kernel_monitor);
1032 udev_selinux_exit(udev);