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 major(udev_device_get_devnum(event->dev)) != 0)
221 udev_watch_clear(event->udev, event->dev);
223 /* apply rules, create node, symlinks */
224 err = udev_event_execute_rules(event, rules);
226 /* rules may change/disable the timeout */
227 if (udev_device_get_event_timeout(event->dev) >= 0)
228 alarm(udev_device_get_event_timeout(event->dev));
231 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
232 udev_event_execute_run(event);
234 /* apply/restore inotify watch */
235 if (err == 0 && event->inotify_watch && inotify_fd != -1 &&
236 major(udev_device_get_devnum(event->dev)) != 0 &&
237 strcmp(udev_device_get_action(event->dev), "remove") != 0)
238 info(event->udev, "device will be watched for changes\n");
239 udev_watch_begin(event->udev, event->dev);
241 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
247 err(event->udev, "fork of child failed: %m\n");
248 event_queue_delete(event);
251 /* get SIGCHLD in main loop */
252 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
253 udev_device_get_seqnum(event->dev),
255 udev_device_get_action(event->dev),
256 udev_device_get_subsystem(event->dev),
257 time(NULL) - event->queue_time);
263 static void event_queue_insert(struct udev_event *event)
265 char filename[UTIL_PATH_SIZE];
268 event->queue_time = time(NULL);
270 export_event_state(event, EVENT_QUEUED);
271 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
272 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
274 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
275 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
276 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
281 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
287 udev_list_node_append(&event->node, &event_list);
290 /* run all events with a timeout set immediately */
291 if (udev_device_get_timeout(event->dev) > 0) {
297 static int mem_size_mb(void)
301 long int memsize = -1;
303 f = fopen("/proc/meminfo", "r");
307 while (fgets(buf, sizeof(buf), f) != NULL) {
310 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
311 memsize = value / 1024;
320 static int compare_devpath(const char *running, const char *waiting)
324 while (running[i] != '\0' && running[i] == waiting[i])
327 /* identical device event found */
328 if (running[i] == '\0' && waiting[i] == '\0')
331 /* parent device event found */
332 if (running[i] == '\0' && waiting[i] == '/')
335 /* child device event found */
336 if (running[i] == '/' && waiting[i] == '\0')
339 /* no matching event */
343 /* lookup event for identical, parent, child, or physical device */
344 static int devpath_busy(struct udev_event *event)
346 struct udev_list_node *loop;
348 if (event->delaying_seqnum > 0) {
350 /* check if queue contains events we depend on */
351 udev_list_node_foreach(loop, &event_list) {
352 struct udev_event *loop_event = node_to_event(loop);
354 /* we already found a later event, earlier can not block us, no need to check again */
355 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
358 /* event we checked earlier still exists, no need to check again */
359 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
362 /* found ourself, no later event can block us */
363 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
366 /* check our old name */
367 if (udev_device_get_devpath_old(event->dev) != NULL)
368 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
369 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
373 /* check identical, parent, or child device event */
374 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
375 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
376 udev_device_get_seqnum(event->dev),
377 udev_device_get_seqnum(loop_event->dev),
378 udev_device_get_devpath(loop_event->dev));
379 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
383 /* check for our major:minor number */
384 if (major(udev_device_get_devnum(event->dev)) > 0 &&
385 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
386 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
387 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
388 udev_device_get_seqnum(event->dev),
389 udev_device_get_seqnum(loop_event->dev),
390 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
391 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
395 /* check physical device event (special case of parent) */
396 if (udev_device_get_physdevpath(event->dev) != NULL &&
397 strcmp(udev_device_get_action(event->dev), "add") == 0)
398 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
399 udev_device_get_physdevpath(event->dev)) != 0) {
400 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
401 udev_device_get_seqnum(event->dev),
402 udev_device_get_seqnum(loop_event->dev),
403 udev_device_get_devpath(loop_event->dev));
404 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
411 /* serializes events for the identical and parent and child devices */
412 static void event_queue_manager(struct udev *udev)
414 struct udev_list_node *loop;
415 struct udev_list_node *tmp;
418 if (udev_list_is_empty(&event_list)) {
420 err(udev, "event list empty, but childs count is %i", childs);
426 udev_list_node_foreach_safe(loop, tmp, &event_list) {
427 struct udev_event *loop_event = node_to_event(loop);
429 if (childs >= max_childs) {
430 info(udev, "maximum number (%i) of childs reached\n", childs);
434 if (loop_event->pid != 0)
437 /* do not start event if parent or child event is still running */
438 if (devpath_busy(loop_event) != 0) {
439 dbg(udev, "delay seq %llu (%s)\n",
440 udev_device_get_seqnum(loop_event->dev),
441 udev_device_get_devpath(loop_event->dev));
445 event_fork(loop_event);
446 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
448 /* retry if events finished in the meantime */
449 if (sigchilds_waiting) {
450 sigchilds_waiting = 0;
457 /* receive the udevd message from userspace */
458 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
460 struct udev *udev = udev_ctrl_get_udev(uctrl);
461 struct udev_ctrl_msg *ctrl_msg;
465 ctrl_msg = udev_ctrl_receive_msg(uctrl);
466 if (ctrl_msg == NULL)
469 i = udev_ctrl_get_set_log_level(ctrl_msg);
471 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
472 udev_set_log_priority(udev, i);
475 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
476 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
480 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
481 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
483 event_queue_manager(udev);
486 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
487 info(udev, "udevd message (RELOAD_RULES) received\n");
491 str = udev_ctrl_get_set_env(ctrl_msg);
499 val = strchr(key, '=');
503 if (val[0] == '\0') {
504 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
505 udev_add_property(udev, key, NULL);
507 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
508 udev_add_property(udev, key, val);
511 err(udev, "wrong key format '%s'\n", key);
517 i = udev_ctrl_get_set_max_childs(ctrl_msg);
519 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
522 udev_ctrl_msg_unref(ctrl_msg);
525 /* read inotify messages */
526 static int handle_inotify(struct udev *udev)
530 struct inotify_event *ev;
532 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
535 buf = malloc(nbytes);
537 err(udev, "error getting buffer for inotify, disable watching\n");
543 read(inotify_fd, buf, nbytes);
545 for (pos = 0, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
548 dbg(udev, "inotify event: %x for %d (%s)\n", ev->mask, ev->wd, ev->len ? ev->name : "*");
550 syspath = udev_watch_lookup(udev, ev->wd);
551 if (syspath != NULL) {
552 dbg(udev, "inotify event: %x for %s\n", ev->mask, syspath);
553 if (ev->mask & IN_CLOSE_WRITE) {
554 char filename[UTIL_PATH_SIZE];
557 info(udev, "device %s closed, synthesising 'change'\n", syspath);
558 util_strlcpy(filename, syspath, sizeof(filename));
559 util_strlcat(filename, "/uevent", sizeof(filename));
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, ev->wd);
576 static void asmlinkage sig_handler(int signum)
584 /* set flag, then write to pipe if needed */
585 sigchilds_waiting = 1;
595 static void udev_done(int pid, int exitstatus)
597 struct udev_list_node *loop;
599 /* find event associated with pid and delete it */
600 udev_list_node_foreach(loop, &event_list) {
601 struct udev_event *loop_event = node_to_event(loop);
603 if (loop_event->pid == pid) {
604 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
605 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
606 exitstatus, time(NULL) - loop_event->queue_time);
607 loop_event->exitstatus = exitstatus;
609 fprintf(stderr, "exit %s (%llu)\n",
610 udev_device_get_syspath(loop_event->dev),
611 udev_device_get_seqnum(loop_event->dev));
612 event_queue_delete(loop_event);
615 /* there may be dependent events waiting */
622 static void reap_sigchilds(void)
628 pid = waitpid(-1, &status, WNOHANG);
631 if (WIFEXITED(status))
632 status = WEXITSTATUS(status);
633 else if (WIFSIGNALED(status))
634 status = WTERMSIG(status) + 128;
637 udev_done(pid, status);
641 static void cleanup_queue_dir(struct udev *udev)
643 char dirname[UTIL_PATH_SIZE];
644 char filename[UTIL_PATH_SIZE];
647 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
648 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
651 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
652 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
653 dir = opendir(dirname);
659 if (dent == NULL || dent->d_name[0] == '\0')
661 if (dent->d_name[0] == '.')
663 util_strlcpy(filename, dirname, sizeof(filename));
664 util_strlcat(filename, "/", sizeof(filename));
665 util_strlcat(filename, dent->d_name, sizeof(filename));
673 static void export_initial_seqnum(struct udev *udev)
675 char filename[UTIL_PATH_SIZE];
680 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
681 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
682 fd = open(filename, O_RDONLY);
684 len = read(fd, seqnum, sizeof(seqnum)-1);
688 strcpy(seqnum, "0\n");
691 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
692 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
693 util_create_path(udev, filename);
694 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
696 write(fd, seqnum, len);
701 int main(int argc, char *argv[])
705 struct sigaction act;
708 int resolve_names = 1;
709 static const struct option options[] = {
710 { "daemon", no_argument, NULL, 'd' },
711 { "debug-trace", no_argument, NULL, 't' },
712 { "debug", no_argument, NULL, 'D' },
713 { "help", no_argument, NULL, 'h' },
714 { "version", no_argument, NULL, 'V' },
715 { "resolve-names", required_argument, NULL, 'N' },
724 logging_init("udevd");
725 udev_set_log_fn(udev, log_fn);
726 info(udev, "version %s\n", VERSION);
727 udev_selinux_init(udev);
732 option = getopt_long(argc, argv, "dDthV", options, NULL);
745 if (udev_get_log_priority(udev) < LOG_INFO)
746 udev_set_log_priority(udev, LOG_INFO);
749 if (strcmp (optarg, "early") == 0) {
751 } else if (strcmp (optarg, "late") == 0) {
753 } else if (strcmp (optarg, "never") == 0) {
756 fprintf(stderr, "resolve-names must be early, late or never\n");
757 err(udev, "resolve-names must be early, late or never\n");
762 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
763 "[--resolve-names=early|late|never] [--version]\n");
766 printf("%s\n", VERSION);
774 fprintf(stderr, "root privileges required\n");
775 err(udev, "root privileges required\n");
779 /* make sure std{in,out,err} fd's are in a sane state */
780 fd = open("/dev/null", O_RDWR);
782 fprintf(stderr, "cannot open /dev/null\n");
783 err(udev, "cannot open /dev/null\n");
785 if (write(STDOUT_FILENO, 0, 0) < 0)
786 dup2(fd, STDOUT_FILENO);
787 if (write(STDERR_FILENO, 0, 0) < 0)
788 dup2(fd, STDERR_FILENO);
790 /* init control socket, bind() ensures, that only one udevd instance is running */
791 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
792 if (udev_ctrl == NULL) {
793 fprintf(stderr, "error initializing control socket");
794 err(udev, "error initializing udevd socket");
799 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
800 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
801 err(udev, "error binding control socket, seems udevd is already running\n");
806 kernel_monitor = udev_monitor_new_from_netlink(udev);
807 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
808 fprintf(stderr, "error initializing netlink socket\n");
809 err(udev, "error initializing netlink socket\n");
813 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
815 rules = udev_rules_new(udev, resolve_names);
817 err(udev, "error reading rules\n");
820 udev_list_init(&event_list);
821 cleanup_queue_dir(udev);
822 export_initial_seqnum(udev);
830 dbg(udev, "daemonized fork running\n");
833 err(udev, "fork of daemon failed: %m\n");
837 dbg(udev, "child [%u] running, parent exits\n", pid);
843 /* redirect std{out,err} */
844 if (!debug && !debug_trace) {
845 dup2(fd, STDIN_FILENO);
846 dup2(fd, STDOUT_FILENO);
847 dup2(fd, STDERR_FILENO);
849 if (fd > STDERR_FILENO)
852 /* set scheduling priority for the daemon */
853 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
859 /* OOM_DISABLE == -17 */
860 fd = open("/proc/self/oom_adj", O_RDWR);
862 err(udev, "error disabling OOM: %m\n");
868 fd = open("/dev/kmsg", O_WRONLY);
870 const char *ver_str = "<6>udev: starting version " VERSION "\n";
871 char path[UTIL_PATH_SIZE];
874 write(fd, ver_str, strlen(ver_str));
875 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
876 util_strlcat(path, "/class/mem/null", sizeof(path));
877 if (lstat(path, &statbuf) == 0) {
878 if (S_ISDIR(statbuf.st_mode)) {
879 const char *depr_str =
880 "<6>udev: deprecated sysfs layout; update the kernel or "
881 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
882 "not work correctly\n";
884 write(fd, depr_str, strlen(depr_str));
890 /* set signal handlers */
891 memset(&act, 0x00, sizeof(struct sigaction));
892 act.sa_handler = (void (*)(int)) sig_handler;
893 sigemptyset(&act.sa_mask);
894 act.sa_flags = SA_RESTART;
895 sigaction(SIGINT, &act, NULL);
896 sigaction(SIGTERM, &act, NULL);
897 sigaction(SIGCHLD, &act, NULL);
898 sigaction(SIGHUP, &act, NULL);
900 /* watch rules directory */
901 udev_watch_init(udev);
902 if (inotify_fd >= 0) {
903 if (udev_get_rules_path(udev) != NULL) {
904 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
905 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
907 char filename[UTIL_PATH_SIZE];
909 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
910 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
911 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
912 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
914 /* watch dynamic rules directory */
915 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
916 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
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 cleanup_queue_dir(udev);
1030 udev_rules_unref(rules);
1031 udev_ctrl_unref(udev_ctrl);
1032 if (inotify_fd >= 0)
1034 udev_monitor_unref(kernel_monitor);
1035 udev_selinux_exit(udev);