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>
34 #include <sys/ioctl.h>
36 #include <sys/inotify.h>
41 #define UDEVD_PRIORITY -4
42 #define UDEV_PRIORITY -2
44 /* maximum limit of forked childs */
45 #define UDEVD_MAX_CHILDS 256
49 static void log_fn(struct udev *udev, int priority,
50 const char *file, int line, const char *fn,
51 const char *format, va_list args)
54 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
55 vfprintf(stderr, format, args);
57 vsyslog(priority, format, args);
61 static int debug_trace;
62 static struct udev_rules *rules;
63 static struct udev_ctrl *udev_ctrl;
64 static struct udev_monitor *kernel_monitor;
65 static int inotify_fd = -1;
66 static int signal_pipe[2] = {-1, -1};
67 static volatile int sigchilds_waiting;
68 static volatile int udev_exit;
69 static volatile int reload_config;
70 static int run_exec_q;
71 static int stop_exec_q;
72 static int max_childs;
74 static struct udev_list_node event_list;
82 static struct udev_event *node_to_event(struct udev_list_node *node)
87 event -= offsetof(struct udev_event, node);
88 return (struct udev_event *)event;
91 static void export_event_state(struct udev_event *event, enum event_state state)
93 char filename[UTIL_PATH_SIZE];
94 char filename_failed[UTIL_PATH_SIZE];
97 /* location of queue file */
98 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
99 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
101 /* location of failed file */
102 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
103 util_strlcat(filename_failed, "/", sizeof(filename_failed));
104 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
105 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
106 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
110 if(unlink(filename_failed) == 0)
111 util_delete_path(event->udev, filename_failed);
112 util_create_path(event->udev, filename);
113 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
114 symlink(udev_device_get_devpath(event->dev), filename);
115 udev_selinux_resetfscreatecon(event->udev);
118 if (udev_device_get_devpath_old(event->dev) != NULL) {
119 /* "move" event - rename failed file to current name, do not delete failed */
120 char filename_failed_old[UTIL_PATH_SIZE];
122 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
123 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
124 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
125 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
126 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
128 if (rename(filename_failed_old, filename_failed) == 0)
129 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
130 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
132 if (unlink(filename_failed) == 0)
133 util_delete_path(event->udev, filename_failed);
138 /* clean up possibly empty queue directory */
139 if (udev_list_is_empty(&event_list))
140 util_delete_path(event->udev, filename);
143 /* move failed event to the failed directory */
144 util_create_path(event->udev, filename_failed);
145 rename(filename, filename_failed);
147 /* clean up possibly empty queue directory */
148 if (udev_list_is_empty(&event_list))
149 util_delete_path(event->udev, filename);
156 static void event_queue_delete(struct udev_event *event)
158 udev_list_node_remove(&event->node);
160 /* mark as failed, if "add" event returns non-zero */
161 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
162 export_event_state(event, EVENT_FAILED);
164 export_event_state(event, EVENT_FINISHED);
166 udev_device_unref(event->dev);
167 udev_event_unref(event);
170 static void asmlinkage event_sig_handler(int signum)
172 if (signum == SIGALRM)
176 static void event_fork(struct udev_event *event)
179 struct sigaction act;
184 fprintf(stderr, "fork %s (%llu)\n",
185 udev_device_get_syspath(event->dev),
186 udev_device_get_seqnum(event->dev));
193 udev_monitor_unref(kernel_monitor);
194 udev_ctrl_unref(udev_ctrl);
197 close(signal_pipe[READ_END]);
198 close(signal_pipe[WRITE_END]);
200 logging_init("udevd-event");
201 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
203 /* set signal handlers */
204 memset(&act, 0x00, sizeof(act));
205 act.sa_handler = (void (*)(int)) event_sig_handler;
206 sigemptyset (&act.sa_mask);
208 sigaction(SIGALRM, &act, NULL);
210 /* reset to default */
211 act.sa_handler = SIG_DFL;
212 sigaction(SIGINT, &act, NULL);
213 sigaction(SIGTERM, &act, NULL);
214 sigaction(SIGCHLD, &act, NULL);
215 sigaction(SIGHUP, &act, NULL);
217 /* set timeout to prevent hanging processes */
218 alarm(UDEV_EVENT_TIMEOUT);
220 /* apply rules, create node, symlinks */
221 err = udev_event_execute_rules(event, rules);
223 /* rules may change/disable the timeout */
224 if (udev_device_get_event_timeout(event->dev) >= 0)
225 alarm(udev_device_get_event_timeout(event->dev));
228 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
229 udev_event_execute_run(event);
231 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
237 err(event->udev, "fork of child failed: %m\n");
238 event_queue_delete(event);
241 /* get SIGCHLD in main loop */
242 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
243 udev_device_get_seqnum(event->dev),
245 udev_device_get_action(event->dev),
246 udev_device_get_subsystem(event->dev),
247 time(NULL) - event->queue_time);
253 static void event_queue_insert(struct udev_event *event)
255 char filename[UTIL_PATH_SIZE];
258 event->queue_time = time(NULL);
260 export_event_state(event, EVENT_QUEUED);
261 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
262 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
264 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
265 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
266 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
271 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
277 udev_list_node_append(&event->node, &event_list);
280 /* run all events with a timeout set immediately */
281 if (udev_device_get_timeout(event->dev) > 0) {
287 static int mem_size_mb(void)
291 long int memsize = -1;
293 f = fopen("/proc/meminfo", "r");
297 while (fgets(buf, sizeof(buf), f) != NULL) {
300 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
301 memsize = value / 1024;
310 static int compare_devpath(const char *running, const char *waiting)
314 while (running[i] != '\0' && running[i] == waiting[i])
317 /* identical device event found */
318 if (running[i] == '\0' && waiting[i] == '\0')
321 /* parent device event found */
322 if (running[i] == '\0' && waiting[i] == '/')
325 /* child device event found */
326 if (running[i] == '/' && waiting[i] == '\0')
329 /* no matching event */
333 /* lookup event for identical, parent, child, or physical device */
334 static int devpath_busy(struct udev_event *event)
336 struct udev_list_node *loop;
338 if (event->delaying_seqnum > 0) {
340 /* check if queue contains events we depend on */
341 udev_list_node_foreach(loop, &event_list) {
342 struct udev_event *loop_event = node_to_event(loop);
344 /* we already found a later event, earlier can not block us, no need to check again */
345 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
348 /* event we checked earlier still exists, no need to check again */
349 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
352 /* found ourself, no later event can block us */
353 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
356 /* check our old name */
357 if (udev_device_get_devpath_old(event->dev) != NULL)
358 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
359 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
363 /* check identical, parent, or child device event */
364 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
365 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
366 udev_device_get_seqnum(event->dev),
367 udev_device_get_seqnum(loop_event->dev),
368 udev_device_get_devpath(loop_event->dev));
369 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
373 /* check for our major:minor number */
374 if (major(udev_device_get_devnum(event->dev)) > 0 &&
375 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
376 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
377 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
378 udev_device_get_seqnum(event->dev),
379 udev_device_get_seqnum(loop_event->dev),
380 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
381 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
385 /* check physical device event (special case of parent) */
386 if (udev_device_get_physdevpath(event->dev) != NULL &&
387 strcmp(udev_device_get_action(event->dev), "add") == 0)
388 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
389 udev_device_get_physdevpath(event->dev)) != 0) {
390 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
391 udev_device_get_seqnum(event->dev),
392 udev_device_get_seqnum(loop_event->dev),
393 udev_device_get_devpath(loop_event->dev));
394 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
401 /* serializes events for the identical and parent and child devices */
402 static void event_queue_manager(struct udev *udev)
404 struct udev_list_node *loop;
405 struct udev_list_node *tmp;
407 if (udev_list_is_empty(&event_list)) {
409 err(udev, "event list empty, but childs count is %i", childs);
415 udev_list_node_foreach_safe(loop, tmp, &event_list) {
416 struct udev_event *loop_event = node_to_event(loop);
418 if (childs >= max_childs) {
419 info(udev, "maximum number (%i) of childs reached\n", childs);
423 if (loop_event->pid != 0)
426 /* do not start event if parent or child event is still running */
427 if (devpath_busy(loop_event) != 0) {
428 dbg(udev, "delay seq %llu (%s)\n",
429 udev_device_get_seqnum(loop_event->dev),
430 udev_device_get_devpath(loop_event->dev));
434 event_fork(loop_event);
435 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
439 /* receive the udevd message from userspace */
440 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
442 struct udev *udev = udev_ctrl_get_udev(uctrl);
443 struct udev_ctrl_msg *ctrl_msg;
447 ctrl_msg = udev_ctrl_receive_msg(uctrl);
448 if (ctrl_msg == NULL)
451 i = udev_ctrl_get_set_log_level(ctrl_msg);
453 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
454 udev_set_log_priority(udev, i);
457 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
458 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
462 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
463 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
465 event_queue_manager(udev);
468 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
469 info(udev, "udevd message (RELOAD_RULES) received\n");
473 str = udev_ctrl_get_set_env(ctrl_msg);
481 val = strchr(key, '=');
485 if (val[0] == '\0') {
486 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
487 udev_add_property(udev, key, NULL);
489 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
490 udev_add_property(udev, key, val);
493 err(udev, "wrong key format '%s'\n", key);
499 i = udev_ctrl_get_set_max_childs(ctrl_msg);
501 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
504 udev_ctrl_msg_unref(ctrl_msg);
507 static void asmlinkage sig_handler(int signum)
515 /* set flag, then write to pipe if needed */
516 sigchilds_waiting = 1;
523 /* write to pipe, which will wakeup select() in our mainloop */
524 write(signal_pipe[WRITE_END], "", 1);
527 static void udev_done(int pid, int exitstatus)
529 struct udev_list_node *loop;
531 /* find event associated with pid and delete it */
532 udev_list_node_foreach(loop, &event_list) {
533 struct udev_event *loop_event = node_to_event(loop);
535 if (loop_event->pid == pid) {
536 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
537 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
538 exitstatus, time(NULL) - loop_event->queue_time);
539 loop_event->exitstatus = exitstatus;
541 fprintf(stderr, "exit %s (%llu)\n",
542 udev_device_get_syspath(loop_event->dev),
543 udev_device_get_seqnum(loop_event->dev));
544 event_queue_delete(loop_event);
547 /* there may be dependent events waiting */
554 static void reap_sigchilds(void)
560 pid = waitpid(-1, &status, WNOHANG);
563 if (WIFEXITED(status))
564 status = WEXITSTATUS(status);
565 else if (WIFSIGNALED(status))
566 status = WTERMSIG(status) + 128;
569 udev_done(pid, status);
573 static void cleanup_queue_dir(struct udev *udev)
575 char dirname[UTIL_PATH_SIZE];
576 char filename[UTIL_PATH_SIZE];
579 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
580 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
583 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
584 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
585 dir = opendir(dirname);
591 if (dent == NULL || dent->d_name[0] == '\0')
593 if (dent->d_name[0] == '.')
595 util_strlcpy(filename, dirname, sizeof(filename));
596 util_strlcat(filename, "/", sizeof(filename));
597 util_strlcat(filename, dent->d_name, sizeof(filename));
605 static void export_initial_seqnum(struct udev *udev)
607 char filename[UTIL_PATH_SIZE];
612 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
613 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
614 fd = open(filename, O_RDONLY);
616 len = read(fd, seqnum, sizeof(seqnum)-1);
620 strcpy(seqnum, "0\n");
623 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
624 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
625 util_create_path(udev, filename);
626 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
628 write(fd, seqnum, len);
633 int main(int argc, char *argv[])
638 struct sigaction act;
642 int resolve_names = 1;
643 static const struct option options[] = {
644 { "daemon", no_argument, NULL, 'd' },
645 { "debug-trace", no_argument, NULL, 't' },
646 { "debug", no_argument, NULL, 'D' },
647 { "help", no_argument, NULL, 'h' },
648 { "version", no_argument, NULL, 'V' },
649 { "resolve-names", required_argument, NULL, 'N' },
659 logging_init("udevd");
660 udev_set_log_fn(udev, log_fn);
661 info(udev, "version %s\n", VERSION);
662 udev_selinux_init(udev);
667 option = getopt_long(argc, argv, "dDthV", options, NULL);
680 if (udev_get_log_priority(udev) < LOG_INFO)
681 udev_set_log_priority(udev, LOG_INFO);
684 if (strcmp (optarg, "early") == 0) {
686 } else if (strcmp (optarg, "never") == 0) {
689 fprintf(stderr, "resolve-names must be early or never\n");
690 err(udev, "resolve-names must be early or never\n");
695 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--resolve-names=early|never] [--version]\n");
698 printf("%s\n", VERSION);
706 fprintf(stderr, "root privileges required\n");
707 err(udev, "root privileges required\n");
711 /* make sure std{in,out,err} fd's are in a sane state */
712 fd = open("/dev/null", O_RDWR);
714 fprintf(stderr, "cannot open /dev/null\n");
715 err(udev, "cannot open /dev/null\n");
717 if (write(STDOUT_FILENO, 0, 0) < 0)
718 dup2(fd, STDOUT_FILENO);
719 if (write(STDERR_FILENO, 0, 0) < 0)
720 dup2(fd, STDERR_FILENO);
722 /* init control socket, bind() ensures, that only one udevd instance is running */
723 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
724 if (udev_ctrl == NULL) {
725 fprintf(stderr, "error initializing control socket");
726 err(udev, "error initializing udevd socket");
731 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
732 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
733 err(udev, "error binding control socket, seems udevd is already running\n");
738 kernel_monitor = udev_monitor_new_from_netlink(udev);
739 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
740 fprintf(stderr, "error initializing netlink socket\n");
741 err(udev, "error initializing netlink socket\n");
745 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
747 err = pipe(signal_pipe);
749 err(udev, "error getting pipes: %m\n");
753 err = fcntl(signal_pipe[READ_END], F_GETFL, 0);
755 err(udev, "error fcntl on read pipe: %m\n");
758 err = fcntl(signal_pipe[READ_END], F_SETFL, err | O_NONBLOCK);
760 err(udev, "error fcntl on read pipe: %m\n");
764 err = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
766 err(udev, "error fcntl on write pipe: %m\n");
769 err = fcntl(signal_pipe[WRITE_END], F_SETFL, err | O_NONBLOCK);
771 err(udev, "error fcntl on write pipe: %m\n");
775 rules = udev_rules_new(udev, resolve_names);
777 err(udev, "error reading rules\n");
780 udev_list_init(&event_list);
781 cleanup_queue_dir(udev);
782 export_initial_seqnum(udev);
790 dbg(udev, "daemonized fork running\n");
793 err(udev, "fork of daemon failed: %m\n");
797 dbg(udev, "child [%u] running, parent exits\n", pid);
803 /* redirect std{out,err} */
804 if (!debug && !debug_trace) {
805 dup2(fd, STDIN_FILENO);
806 dup2(fd, STDOUT_FILENO);
807 dup2(fd, STDERR_FILENO);
809 if (fd > STDERR_FILENO)
812 /* set scheduling priority for the daemon */
813 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
819 /* OOM_DISABLE == -17 */
820 fd = open("/proc/self/oom_adj", O_RDWR);
822 err(udev, "error disabling OOM: %m\n");
828 fd = open("/dev/kmsg", O_WRONLY);
830 const char *ver_str = "<6>udev: starting version " VERSION "\n";
831 char path[UTIL_PATH_SIZE];
834 write(fd, ver_str, strlen(ver_str));
835 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
836 util_strlcat(path, "/class/mem/null", sizeof(path));
837 if (lstat(path, &statbuf) == 0) {
838 if (S_ISDIR(statbuf.st_mode)) {
839 const char *depr_str =
840 "<6>udev: deprecated sysfs layout; update the kernel or "
841 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
842 "not work correctly\n";
844 write(fd, depr_str, strlen(depr_str));
850 /* set signal handlers */
851 memset(&act, 0x00, sizeof(struct sigaction));
852 act.sa_handler = (void (*)(int)) sig_handler;
853 sigemptyset(&act.sa_mask);
854 act.sa_flags = SA_RESTART;
855 sigaction(SIGINT, &act, NULL);
856 sigaction(SIGTERM, &act, NULL);
857 sigaction(SIGCHLD, &act, NULL);
858 sigaction(SIGHUP, &act, NULL);
860 /* watch rules directory */
861 inotify_fd = inotify_init();
862 if (inotify_fd >= 0) {
863 if (udev_get_rules_path(udev) != NULL) {
864 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
865 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
867 char filename[UTIL_PATH_SIZE];
869 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
870 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
871 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
872 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
874 /* watch dynamic rules directory */
875 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
876 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
877 inotify_add_watch(inotify_fd, filename,
878 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
880 } else if (errno == ENOSYS)
881 info(udev, "unable to use inotify, udevd will not monitor rule files changes\n");
883 err(udev, "inotify_init failed: %m\n");
885 /* in trace mode run one event after the other */
889 int memsize = mem_size_mb();
891 max_childs = 128 + (memsize / 4);
893 max_childs = UDEVD_MAX_CHILDS;
895 /* possibly overwrite maximum limit of executed events */
896 value = getenv("UDEVD_MAX_CHILDS");
898 max_childs = strtoul(value, NULL, 10);
899 info(udev, "initialize max_childs to %u\n", max_childs);
901 maxfd = udev_ctrl_get_fd(udev_ctrl);
902 maxfd = UDEV_MAX(maxfd, udev_monitor_get_fd(kernel_monitor));
903 maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
904 maxfd = UDEV_MAX(maxfd, inotify_fd);
909 FD_SET(signal_pipe[READ_END], &readfds);
910 FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
911 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
913 FD_SET(inotify_fd, &readfds);
914 fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
917 err(udev, "error in select: %m\n");
921 /* get control message */
922 if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
923 handle_ctrl_msg(udev_ctrl);
925 /* get kernel uevent */
926 if (FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
927 struct udev_device *dev;
929 dev = udev_monitor_receive_device(kernel_monitor);
931 struct udev_event *event;
933 event = udev_event_new(dev);
935 event_queue_insert(event);
937 udev_device_unref(dev);
941 /* received a signal, clear our notification pipe */
942 if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
945 read(signal_pipe[READ_END], &buf, sizeof(buf));
948 /* rules directory inotify watch */
949 if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
952 /* discard all possible events, we can just reload the config */
953 if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
957 buf = malloc(nbytes);
959 err(udev, "error getting buffer for inotify, disable watching\n");
963 read(inotify_fd, buf, nbytes);
968 /* rules changed, set by inotify or a HUP signal */
970 struct udev_rules *rules_new;
973 rules_new = udev_rules_new(udev, resolve_names);
974 if (rules_new != NULL) {
975 udev_rules_unref(rules);
980 if (sigchilds_waiting) {
981 sigchilds_waiting = 0;
988 event_queue_manager(udev);
991 cleanup_queue_dir(udev);
994 udev_rules_unref(rules);
995 if (signal_pipe[READ_END] >= 0)
996 close(signal_pipe[READ_END]);
997 if (signal_pipe[WRITE_END] >= 0)
998 close(signal_pipe[WRITE_END]);
999 udev_ctrl_unref(udev_ctrl);
1000 if (inotify_fd >= 0)
1002 udev_monitor_unref(kernel_monitor);
1003 udev_selinux_exit(udev);