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/>.
30 #include <sys/select.h>
33 #include <sys/ioctl.h>
35 #include <sys/inotify.h>
39 #include "udev-rules.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;
67 static int signal_pipe[2] = {-1, -1};
68 static volatile int sigchilds_waiting;
69 static volatile int udev_exit;
70 static volatile int reload_config;
71 static int run_exec_q;
72 static int stop_exec_q;
73 static int max_childs;
75 static LIST_HEAD(exec_list);
76 static LIST_HEAD(running_list);
84 static void export_event_state(struct udev_event *event, enum event_state state)
86 char filename[UTIL_PATH_SIZE];
87 char filename_failed[UTIL_PATH_SIZE];
90 /* location of queue file */
91 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
92 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
94 /* location of failed file */
95 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
96 util_strlcat(filename_failed, "/", sizeof(filename_failed));
97 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
98 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
99 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
103 unlink(filename_failed);
104 delete_path(event->udev, filename_failed);
105 create_path(event->udev, filename);
106 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
107 symlink(udev_device_get_devpath(event->dev), filename);
108 udev_selinux_resetfscreatecon(event->udev);
111 if (udev_device_get_devpath_old(event->dev) != NULL) {
112 /* "move" event - rename failed file to current name, do not delete failed */
113 char filename_failed_old[UTIL_PATH_SIZE];
115 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
116 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
117 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
118 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
119 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
121 if (rename(filename_failed_old, filename_failed) == 0)
122 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
123 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
125 unlink(filename_failed);
126 delete_path(event->udev, filename_failed);
130 delete_path(event->udev, filename);
133 /* move failed event to the failed directory */
134 create_path(event->udev, filename_failed);
135 rename(filename, filename_failed);
137 /* clean up possibly empty queue directory */
138 delete_path(event->udev, filename);
145 static void event_queue_delete(struct udev_event *event)
147 list_del(&event->node);
149 /* mark as failed, if "add" event returns non-zero */
150 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
151 export_event_state(event, EVENT_FAILED);
153 export_event_state(event, EVENT_FINISHED);
155 udev_device_unref(event->dev);
156 udev_event_unref(event);
159 static void asmlinkage event_sig_handler(int signum)
161 if (signum == SIGALRM)
165 static void event_fork(struct udev_event *event)
168 struct sigaction act;
175 udev_monitor_unref(kernel_monitor);
176 udev_ctrl_unref(udev_ctrl);
179 close(signal_pipe[READ_END]);
180 close(signal_pipe[WRITE_END]);
182 logging_init("udevd-event");
183 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
185 /* set signal handlers */
186 memset(&act, 0x00, sizeof(act));
187 act.sa_handler = (void (*)(int)) event_sig_handler;
188 sigemptyset (&act.sa_mask);
190 sigaction(SIGALRM, &act, NULL);
192 /* reset to default */
193 act.sa_handler = SIG_DFL;
194 sigaction(SIGINT, &act, NULL);
195 sigaction(SIGTERM, &act, NULL);
196 sigaction(SIGCHLD, &act, NULL);
197 sigaction(SIGHUP, &act, NULL);
199 /* set timeout to prevent hanging processes */
200 alarm(UDEV_EVENT_TIMEOUT);
202 /* apply rules, create node, symlinks */
203 err = udev_event_run(event, &rules);
205 /* rules may change/disable the timeout */
206 if (udev_device_get_event_timeout(event->dev) >= 0)
207 alarm(udev_device_get_event_timeout(event->dev));
210 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
211 udev_rules_run(event);
212 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
218 err(event->udev, "fork of child failed: %m\n");
219 event_queue_delete(event);
222 /* get SIGCHLD in main loop */
223 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
224 udev_device_get_seqnum(event->dev),
226 udev_device_get_action(event->dev),
227 udev_device_get_subsystem(event->dev),
228 time(NULL) - event->queue_time);
233 static void event_queue_insert(struct udev_event *event)
235 char filename[UTIL_PATH_SIZE];
238 event->queue_time = time(NULL);
240 export_event_state(event, EVENT_QUEUED);
241 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
242 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
244 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
245 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
246 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
251 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
256 /* run one event after the other in debug mode */
258 list_add_tail(&event->node, &running_list);
260 waitpid(event->pid, NULL, 0);
261 event_queue_delete(event);
265 /* run all events with a timeout set immediately */
266 if (udev_device_get_timeout(event->dev) > 0) {
267 list_add_tail(&event->node, &running_list);
272 list_add_tail(&event->node, &exec_list);
276 static int mem_size_mb(void)
280 long int memsize = -1;
282 f = fopen("/proc/meminfo", "r");
286 while (fgets(buf, sizeof(buf), f) != NULL) {
289 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
290 memsize = value / 1024;
299 static int compare_devpath(const char *running, const char *waiting)
303 for (i = 0; i < UTIL_PATH_SIZE; i++) {
304 /* identical device event found */
305 if (running[i] == '\0' && waiting[i] == '\0')
308 /* parent device event found */
309 if (running[i] == '\0' && waiting[i] == '/')
312 /* child device event found */
313 if (running[i] == '/' && waiting[i] == '\0')
316 /* no matching event */
317 if (running[i] != waiting[i])
324 /* lookup event for identical, parent, child, or physical device */
325 static int devpath_busy(struct udev_event *event, int limit)
327 struct udev_event *loop_event;
328 int childs_count = 0;
330 /* check exec-queue which may still contain delayed events we depend on */
331 list_for_each_entry(loop_event, &exec_list, node) {
332 /* skip ourself and all later events */
333 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
336 /* check our old name */
337 if (udev_device_get_devpath_old(event->dev) != NULL)
338 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
341 /* check identical, parent, or child device event */
342 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
343 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
344 udev_device_get_seqnum(event->dev),
345 udev_device_get_seqnum(loop_event->dev),
346 udev_device_get_devpath(loop_event->dev));
350 /* check for our major:minor number */
351 if (major(udev_device_get_devnum(event->dev)) > 0 &&
352 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
353 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
354 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
355 udev_device_get_seqnum(event->dev),
356 udev_device_get_seqnum(loop_event->dev),
357 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
361 /* check physical device event (special case of parent) */
362 if (udev_device_get_physdevpath(event->dev) != NULL &&
363 strcmp(udev_device_get_action(event->dev), "add") == 0)
364 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
365 udev_device_get_physdevpath(event->dev)) != 0) {
366 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
367 udev_device_get_seqnum(event->dev),
368 udev_device_get_seqnum(loop_event->dev),
369 udev_device_get_devpath(loop_event->dev));
374 /* check run queue for still running events */
375 list_for_each_entry(loop_event, &running_list, node) {
378 if (childs_count++ >= limit) {
379 info(event->udev, "%llu, maximum number (%i) of childs reached\n",
380 udev_device_get_seqnum(event->dev), childs_count);
384 /* check our old name */
385 if (udev_device_get_devpath_old(event->dev) != NULL)
386 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
389 /* check identical, parent, or child device event */
390 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
391 dbg(event->udev, "%llu, device event still running %llu (%s)\n",
392 udev_device_get_seqnum(event->dev),
393 udev_device_get_seqnum(loop_event->dev),
394 udev_device_get_devpath(loop_event->dev));
398 /* check for our major:minor number */
399 if (major(udev_device_get_devnum(event->dev)) > 0 &&
400 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
401 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
402 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
403 udev_device_get_seqnum(event->dev),
404 udev_device_get_seqnum(loop_event->dev),
405 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
409 /* check physical device event (special case of parent) */
410 if (udev_device_get_physdevpath(event->dev) != NULL &&
411 strcmp(udev_device_get_action(event->dev), "add") == 0)
412 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
413 udev_device_get_physdevpath(event->dev)) != 0) {
414 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
415 udev_device_get_seqnum(event->dev),
416 udev_device_get_seqnum(loop_event->dev),
417 udev_device_get_devpath(loop_event->dev));
424 /* serializes events for the identical and parent and child devices */
425 static void event_queue_manager(struct udev *udev)
427 struct udev_event *loop_event;
428 struct udev_event *tmp_event;
430 if (list_empty(&exec_list))
433 list_for_each_entry_safe(loop_event, tmp_event, &exec_list, node) {
434 /* serialize and wait for parent or child events */
435 if (devpath_busy(loop_event, max_childs) != 0) {
436 dbg(udev, "delay seq %llu (%s)\n",
437 udev_device_get_seqnum(loop_event->dev),
438 udev_device_get_devpath(loop_event->dev));
442 /* move event to run list */
443 list_move_tail(&loop_event->node, &running_list);
444 event_fork(loop_event);
445 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
449 /* receive the udevd message from userspace */
450 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
452 struct udev *udev = udev_ctrl_get_udev(uctrl);
453 struct udev_ctrl_msg *ctrl_msg;
457 ctrl_msg = udev_ctrl_receive_msg(uctrl);
458 if (ctrl_msg == NULL)
461 i = udev_ctrl_get_set_log_level(ctrl_msg);
463 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
464 udev_set_log_priority(udev, i);
467 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
468 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
472 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
473 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
475 event_queue_manager(udev);
478 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
479 info(udev, "udevd message (RELOAD_RULES) received\n");
483 str = udev_ctrl_get_set_env(ctrl_msg);
491 val = strchr(key, '=');
495 if (val[0] == '\0') {
496 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
497 udev_add_property(udev, key, NULL);
499 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
500 udev_add_property(udev, key, val);
503 err(udev, "wrong key format '%s'\n", key);
509 i = udev_ctrl_get_set_max_childs(ctrl_msg);
511 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
515 udev_ctrl_msg_unref(ctrl_msg);
518 static void asmlinkage sig_handler(int signum)
526 /* set flag, then write to pipe if needed */
527 sigchilds_waiting = 1;
534 /* write to pipe, which will wakeup select() in our mainloop */
535 write(signal_pipe[WRITE_END], "", 1);
538 static void udev_done(int pid, int exitstatus)
540 /* find event associated with pid and delete it */
541 struct udev_event *event;
543 list_for_each_entry(event, &running_list, node) {
544 if (event->pid == pid) {
545 info(event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
546 udev_device_get_seqnum(event->dev), event->pid,
547 exitstatus, time(NULL) - event->queue_time);
548 event->exitstatus = exitstatus;
549 event_queue_delete(event);
551 /* there may be events waiting with the same devpath */
558 static void reap_sigchilds(void)
564 pid = waitpid(-1, &status, WNOHANG);
567 if (WIFEXITED(status))
568 status = WEXITSTATUS(status);
569 else if (WIFSIGNALED(status))
570 status = WTERMSIG(status) + 128;
573 udev_done(pid, status);
577 static void export_initial_seqnum(struct udev *udev)
579 char filename[UTIL_PATH_SIZE];
584 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
585 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
586 fd = open(filename, O_RDONLY);
588 len = read(fd, seqnum, sizeof(seqnum)-1);
592 strcpy(seqnum, "0\n");
595 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
596 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
597 create_path(udev, filename);
598 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
600 write(fd, seqnum, len);
605 int main(int argc, char *argv[])
610 struct sigaction act;
614 static const struct option options[] = {
615 { "daemon", no_argument, NULL, 'd' },
616 { "debug-trace", no_argument, NULL, 't' },
617 { "debug", no_argument, NULL, 'D' },
618 { "help", no_argument, NULL, 'h' },
619 { "version", no_argument, NULL, 'V' },
629 logging_init("udevd");
630 udev_set_log_fn(udev, log_fn);
631 info(udev, "version %s\n", VERSION);
637 option = getopt_long(argc, argv, "dDthV", options, NULL);
650 if (udev_get_log_priority(udev) < LOG_INFO)
651 udev_set_log_priority(udev, LOG_INFO);
654 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
657 printf("%s\n", VERSION);
665 fprintf(stderr, "root privileges required\n");
666 err(udev, "root privileges required\n");
670 /* make sure std{in,out,err} fd's are in a sane state */
671 fd = open("/dev/null", O_RDWR);
673 fprintf(stderr, "cannot open /dev/null\n");
674 err(udev, "cannot open /dev/null\n");
676 if (fd > STDIN_FILENO)
677 dup2(fd, STDIN_FILENO);
678 if (write(STDOUT_FILENO, 0, 0) < 0)
679 dup2(fd, STDOUT_FILENO);
680 if (write(STDERR_FILENO, 0, 0) < 0)
681 dup2(fd, STDERR_FILENO);
683 /* init control socket, bind() ensures, that only one udevd instance is running */
684 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
685 if (udev_ctrl == NULL) {
686 fprintf(stderr, "error initializing control socket");
687 err(udev, "error initializing udevd socket");
692 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
693 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
694 err(udev, "error binding control socket, seems udevd is already running\n");
699 kernel_monitor = udev_monitor_new_from_netlink(udev);
700 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
701 fprintf(stderr, "error initializing netlink socket\n");
702 err(udev, "error initializing netlink socket\n");
706 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
708 err = pipe(signal_pipe);
710 err(udev, "error getting pipes: %m\n");
714 err = fcntl(signal_pipe[READ_END], F_GETFL, 0);
716 err(udev, "error fcntl on read pipe: %m\n");
719 err = fcntl(signal_pipe[READ_END], F_SETFL, err | O_NONBLOCK);
721 err(udev, "error fcntl on read pipe: %m\n");
725 err = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
727 err(udev, "error fcntl on write pipe: %m\n");
730 err = fcntl(signal_pipe[WRITE_END], F_SETFL, err | O_NONBLOCK);
732 err(udev, "error fcntl on write pipe: %m\n");
736 udev_rules_init(udev, &rules, 1);
737 export_initial_seqnum(udev);
745 dbg(udev, "daemonized fork running\n");
748 err(udev, "fork of daemon failed: %m\n");
752 dbg(udev, "child [%u] running, parent exits\n", pid);
758 /* redirect std{out,err} */
760 dup2(fd, STDOUT_FILENO);
761 dup2(fd, STDERR_FILENO);
763 if (fd > STDERR_FILENO)
766 /* set scheduling priority for the daemon */
767 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
773 /* OOM_DISABLE == -17 */
774 fd = open("/proc/self/oom_adj", O_RDWR);
776 err(udev, "error disabling OOM: %m\n");
782 fd = open("/dev/kmsg", O_WRONLY);
784 const char *ver_str = "<6>udev: starting version " VERSION "\n";
785 char path[UTIL_PATH_SIZE];
788 write(fd, ver_str, strlen(ver_str));
789 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
790 util_strlcat(path, "/class/mem/null", sizeof(path));
791 if (lstat(path, &statbuf) == 0) {
792 if (S_ISDIR(statbuf.st_mode)) {
793 const char *depr_str = "<6>udev: deprecated sysfs layout (kernel too old, "
794 "or CONFIG_SYSFS_DEPRECATED) is unsupported, some "
795 "udev features may fail\n";
797 write(fd, depr_str, strlen(depr_str));
803 /* set signal handlers */
804 memset(&act, 0x00, sizeof(struct sigaction));
805 act.sa_handler = (void (*)(int)) sig_handler;
806 sigemptyset(&act.sa_mask);
807 act.sa_flags = SA_RESTART;
808 sigaction(SIGINT, &act, NULL);
809 sigaction(SIGTERM, &act, NULL);
810 sigaction(SIGCHLD, &act, NULL);
811 sigaction(SIGHUP, &act, NULL);
813 /* watch rules directory */
814 inotify_fd = inotify_init();
815 if (inotify_fd >= 0) {
816 if (udev_get_rules_path(udev) != NULL) {
817 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
818 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
820 char filename[PATH_MAX];
822 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
823 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
824 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
825 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
827 /* watch dynamic rules directory */
828 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
829 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
830 inotify_add_watch(inotify_fd, filename,
831 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
833 } else if (errno == ENOSYS)
834 err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
836 err(udev, "inotify_init failed: %m\n");
838 /* maximum limit of forked childs */
839 value = getenv("UDEVD_MAX_CHILDS");
841 max_childs = strtoul(value, NULL, 10);
843 int memsize = mem_size_mb();
845 max_childs = 128 + (memsize / 4);
847 max_childs = UDEVD_MAX_CHILDS;
849 info(udev, "initialize max_childs to %u\n", max_childs);
851 maxfd = udev_ctrl_get_fd(udev_ctrl);
852 maxfd = UDEV_MAX(maxfd, udev_monitor_get_fd(kernel_monitor));
853 maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
854 maxfd = UDEV_MAX(maxfd, inotify_fd);
859 FD_SET(signal_pipe[READ_END], &readfds);
860 FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
861 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
863 FD_SET(inotify_fd, &readfds);
864 fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
867 err(udev, "error in select: %m\n");
871 /* get control message */
872 if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
873 handle_ctrl_msg(udev_ctrl);
875 /* get kernel uevent */
876 if (FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
877 struct udev_device *dev;
879 dev = udev_monitor_receive_device(kernel_monitor);
881 struct udev_event *event;
883 event = udev_event_new(dev);
885 event_queue_insert(event);
887 udev_device_unref(dev);
891 /* received a signal, clear our notification pipe */
892 if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
895 read(signal_pipe[READ_END], &buf, sizeof(buf));
898 /* rules directory inotify watch */
899 if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
902 /* discard all possible events, we can just reload the config */
903 if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
907 buf = malloc(nbytes);
909 err(udev, "error getting buffer for inotify, disable watching\n");
913 read(inotify_fd, buf, nbytes);
918 /* rules changed, set by inotify or a HUP signal */
921 udev_rules_cleanup(&rules);
922 udev_rules_init(udev, &rules, 1);
925 if (sigchilds_waiting) {
926 sigchilds_waiting = 0;
933 event_queue_manager(udev);
939 udev_rules_cleanup(&rules);
941 if (signal_pipe[READ_END] >= 0)
942 close(signal_pipe[READ_END]);
943 if (signal_pipe[WRITE_END] >= 0)
944 close(signal_pipe[WRITE_END]);
946 udev_ctrl_unref(udev_ctrl);
949 udev_monitor_unref(kernel_monitor);