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 struct udev_list_node exec_list;
76 static struct udev_list_node running_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 unlink(filename_failed);
113 delete_path(event->udev, filename_failed);
114 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 unlink(filename_failed);
135 delete_path(event->udev, filename_failed);
139 delete_path(event->udev, filename);
142 /* move failed event to the failed directory */
143 create_path(event->udev, filename_failed);
144 rename(filename, filename_failed);
146 /* clean up possibly empty queue directory */
147 delete_path(event->udev, filename);
154 static void event_queue_delete(struct udev_event *event)
156 udev_list_node_remove(&event->node);
158 /* mark as failed, if "add" event returns non-zero */
159 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
160 export_event_state(event, EVENT_FAILED);
162 export_event_state(event, EVENT_FINISHED);
164 udev_device_unref(event->dev);
165 udev_event_unref(event);
168 static void asmlinkage event_sig_handler(int signum)
170 if (signum == SIGALRM)
174 static void event_fork(struct udev_event *event)
177 struct sigaction act;
184 udev_monitor_unref(kernel_monitor);
185 udev_ctrl_unref(udev_ctrl);
188 close(signal_pipe[READ_END]);
189 close(signal_pipe[WRITE_END]);
191 logging_init("udevd-event");
192 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
194 /* set signal handlers */
195 memset(&act, 0x00, sizeof(act));
196 act.sa_handler = (void (*)(int)) event_sig_handler;
197 sigemptyset (&act.sa_mask);
199 sigaction(SIGALRM, &act, NULL);
201 /* reset to default */
202 act.sa_handler = SIG_DFL;
203 sigaction(SIGINT, &act, NULL);
204 sigaction(SIGTERM, &act, NULL);
205 sigaction(SIGCHLD, &act, NULL);
206 sigaction(SIGHUP, &act, NULL);
208 /* set timeout to prevent hanging processes */
209 alarm(UDEV_EVENT_TIMEOUT);
211 /* apply rules, create node, symlinks */
212 err = udev_event_run(event, &rules);
214 /* rules may change/disable the timeout */
215 if (udev_device_get_event_timeout(event->dev) >= 0)
216 alarm(udev_device_get_event_timeout(event->dev));
219 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
220 udev_rules_run(event);
221 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
227 err(event->udev, "fork of child failed: %m\n");
228 event_queue_delete(event);
231 /* get SIGCHLD in main loop */
232 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
233 udev_device_get_seqnum(event->dev),
235 udev_device_get_action(event->dev),
236 udev_device_get_subsystem(event->dev),
237 time(NULL) - event->queue_time);
242 static void event_queue_insert(struct udev_event *event)
244 char filename[UTIL_PATH_SIZE];
247 event->queue_time = time(NULL);
249 export_event_state(event, EVENT_QUEUED);
250 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
251 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
253 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
254 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
255 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
260 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
265 /* run one event after the other in debug mode */
267 udev_list_node_append(&event->node, &running_list);
269 waitpid(event->pid, NULL, 0);
270 event_queue_delete(event);
274 /* run all events with a timeout set immediately */
275 if (udev_device_get_timeout(event->dev) > 0) {
276 udev_list_node_append(&event->node, &running_list);
281 udev_list_node_append(&event->node, &exec_list);
285 static int mem_size_mb(void)
289 long int memsize = -1;
291 f = fopen("/proc/meminfo", "r");
295 while (fgets(buf, sizeof(buf), f) != NULL) {
298 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
299 memsize = value / 1024;
308 static int compare_devpath(const char *running, const char *waiting)
312 for (i = 0; i < UTIL_PATH_SIZE; i++) {
313 /* identical device event found */
314 if (running[i] == '\0' && waiting[i] == '\0')
317 /* parent device event found */
318 if (running[i] == '\0' && waiting[i] == '/')
321 /* child device event found */
322 if (running[i] == '/' && waiting[i] == '\0')
325 /* no matching event */
326 if (running[i] != waiting[i])
333 /* lookup event for identical, parent, child, or physical device */
334 static int devpath_busy(struct udev_event *event, int limit)
336 struct udev_list_node *loop;
337 int childs_count = 0;
339 /* check exec-queue which may still contain delayed events we depend on */
340 udev_list_node_foreach(loop, &exec_list) {
341 struct udev_event *loop_event = node_to_event(loop);
343 /* skip ourself and all later events */
344 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
347 /* check our old name */
348 if (udev_device_get_devpath_old(event->dev) != NULL)
349 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
352 /* check identical, parent, or child device event */
353 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
354 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
355 udev_device_get_seqnum(event->dev),
356 udev_device_get_seqnum(loop_event->dev),
357 udev_device_get_devpath(loop_event->dev));
361 /* check for our major:minor number */
362 if (major(udev_device_get_devnum(event->dev)) > 0 &&
363 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
364 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
365 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
366 udev_device_get_seqnum(event->dev),
367 udev_device_get_seqnum(loop_event->dev),
368 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
372 /* check physical device event (special case of parent) */
373 if (udev_device_get_physdevpath(event->dev) != NULL &&
374 strcmp(udev_device_get_action(event->dev), "add") == 0)
375 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
376 udev_device_get_physdevpath(event->dev)) != 0) {
377 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
378 udev_device_get_seqnum(event->dev),
379 udev_device_get_seqnum(loop_event->dev),
380 udev_device_get_devpath(loop_event->dev));
385 /* check run queue for still running events */
386 udev_list_node_foreach(loop, &running_list) {
387 struct udev_event *loop_event = node_to_event(loop);
389 if (childs_count++ >= limit) {
390 info(event->udev, "%llu, maximum number (%i) of childs reached\n",
391 udev_device_get_seqnum(event->dev), childs_count);
395 /* check our old name */
396 if (udev_device_get_devpath_old(event->dev) != NULL)
397 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0)
400 /* check identical, parent, or child device event */
401 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
402 dbg(event->udev, "%llu, device event still running %llu (%s)\n",
403 udev_device_get_seqnum(event->dev),
404 udev_device_get_seqnum(loop_event->dev),
405 udev_device_get_devpath(loop_event->dev));
409 /* check for our major:minor number */
410 if (major(udev_device_get_devnum(event->dev)) > 0 &&
411 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
412 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
413 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
414 udev_device_get_seqnum(event->dev),
415 udev_device_get_seqnum(loop_event->dev),
416 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
420 /* check physical device event (special case of parent) */
421 if (udev_device_get_physdevpath(event->dev) != NULL &&
422 strcmp(udev_device_get_action(event->dev), "add") == 0)
423 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
424 udev_device_get_physdevpath(event->dev)) != 0) {
425 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
426 udev_device_get_seqnum(event->dev),
427 udev_device_get_seqnum(loop_event->dev),
428 udev_device_get_devpath(loop_event->dev));
435 /* serializes events for the identical and parent and child devices */
436 static void event_queue_manager(struct udev *udev)
438 struct udev_list_node *loop;
439 struct udev_list_node *tmp;
441 if (udev_list_is_empty(&exec_list))
444 udev_list_node_foreach_safe(loop, tmp, &exec_list) {
445 struct udev_event *loop_event = node_to_event(loop);
447 /* serialize and wait for parent or child events */
448 if (devpath_busy(loop_event, max_childs) != 0) {
449 dbg(udev, "delay seq %llu (%s)\n",
450 udev_device_get_seqnum(loop_event->dev),
451 udev_device_get_devpath(loop_event->dev));
455 /* move event to run list */
456 udev_list_node_remove(&loop_event->node);
457 udev_list_node_append(&loop_event->node, &running_list);
458 event_fork(loop_event);
459 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
463 /* receive the udevd message from userspace */
464 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
466 struct udev *udev = udev_ctrl_get_udev(uctrl);
467 struct udev_ctrl_msg *ctrl_msg;
471 ctrl_msg = udev_ctrl_receive_msg(uctrl);
472 if (ctrl_msg == NULL)
475 i = udev_ctrl_get_set_log_level(ctrl_msg);
477 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
478 udev_set_log_priority(udev, i);
481 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
482 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
486 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
487 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
489 event_queue_manager(udev);
492 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
493 info(udev, "udevd message (RELOAD_RULES) received\n");
497 str = udev_ctrl_get_set_env(ctrl_msg);
505 val = strchr(key, '=');
509 if (val[0] == '\0') {
510 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
511 udev_add_property(udev, key, NULL);
513 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
514 udev_add_property(udev, key, val);
517 err(udev, "wrong key format '%s'\n", key);
523 i = udev_ctrl_get_set_max_childs(ctrl_msg);
525 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
529 udev_ctrl_msg_unref(ctrl_msg);
532 static void asmlinkage sig_handler(int signum)
540 /* set flag, then write to pipe if needed */
541 sigchilds_waiting = 1;
548 /* write to pipe, which will wakeup select() in our mainloop */
549 write(signal_pipe[WRITE_END], "", 1);
552 static void udev_done(int pid, int exitstatus)
554 struct udev_list_node *loop;
556 /* find event associated with pid and delete it */
557 udev_list_node_foreach(loop, &running_list) {
558 struct udev_event *loop_event = node_to_event(loop);
560 if (loop_event->pid == pid) {
561 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
562 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
563 exitstatus, time(NULL) - loop_event->queue_time);
564 loop_event->exitstatus = exitstatus;
565 event_queue_delete(loop_event);
567 /* there may be events waiting with the same devpath */
574 static void reap_sigchilds(void)
580 pid = waitpid(-1, &status, WNOHANG);
583 if (WIFEXITED(status))
584 status = WEXITSTATUS(status);
585 else if (WIFSIGNALED(status))
586 status = WTERMSIG(status) + 128;
589 udev_done(pid, status);
593 static void export_initial_seqnum(struct udev *udev)
595 char filename[UTIL_PATH_SIZE];
600 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
601 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
602 fd = open(filename, O_RDONLY);
604 len = read(fd, seqnum, sizeof(seqnum)-1);
608 strcpy(seqnum, "0\n");
611 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
612 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
613 create_path(udev, filename);
614 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
616 write(fd, seqnum, len);
621 int main(int argc, char *argv[])
626 struct sigaction act;
630 static const struct option options[] = {
631 { "daemon", no_argument, NULL, 'd' },
632 { "debug-trace", no_argument, NULL, 't' },
633 { "debug", no_argument, NULL, 'D' },
634 { "help", no_argument, NULL, 'h' },
635 { "version", no_argument, NULL, 'V' },
645 logging_init("udevd");
646 udev_set_log_fn(udev, log_fn);
647 info(udev, "version %s\n", VERSION);
653 option = getopt_long(argc, argv, "dDthV", options, NULL);
666 if (udev_get_log_priority(udev) < LOG_INFO)
667 udev_set_log_priority(udev, LOG_INFO);
670 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
673 printf("%s\n", VERSION);
681 fprintf(stderr, "root privileges required\n");
682 err(udev, "root privileges required\n");
686 /* make sure std{in,out,err} fd's are in a sane state */
687 fd = open("/dev/null", O_RDWR);
689 fprintf(stderr, "cannot open /dev/null\n");
690 err(udev, "cannot open /dev/null\n");
692 if (fd > STDIN_FILENO)
693 dup2(fd, STDIN_FILENO);
694 if (write(STDOUT_FILENO, 0, 0) < 0)
695 dup2(fd, STDOUT_FILENO);
696 if (write(STDERR_FILENO, 0, 0) < 0)
697 dup2(fd, STDERR_FILENO);
699 /* init control socket, bind() ensures, that only one udevd instance is running */
700 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
701 if (udev_ctrl == NULL) {
702 fprintf(stderr, "error initializing control socket");
703 err(udev, "error initializing udevd socket");
708 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
709 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
710 err(udev, "error binding control socket, seems udevd is already running\n");
715 kernel_monitor = udev_monitor_new_from_netlink(udev);
716 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
717 fprintf(stderr, "error initializing netlink socket\n");
718 err(udev, "error initializing netlink socket\n");
722 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
724 err = pipe(signal_pipe);
726 err(udev, "error getting pipes: %m\n");
730 err = fcntl(signal_pipe[READ_END], F_GETFL, 0);
732 err(udev, "error fcntl on read pipe: %m\n");
735 err = fcntl(signal_pipe[READ_END], F_SETFL, err | O_NONBLOCK);
737 err(udev, "error fcntl on read pipe: %m\n");
741 err = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
743 err(udev, "error fcntl on write pipe: %m\n");
746 err = fcntl(signal_pipe[WRITE_END], F_SETFL, err | O_NONBLOCK);
748 err(udev, "error fcntl on write pipe: %m\n");
752 udev_list_init(&running_list);
753 udev_list_init(&exec_list);
754 udev_rules_init(udev, &rules, 1);
755 export_initial_seqnum(udev);
763 dbg(udev, "daemonized fork running\n");
766 err(udev, "fork of daemon failed: %m\n");
770 dbg(udev, "child [%u] running, parent exits\n", pid);
776 /* redirect std{out,err} */
778 dup2(fd, STDOUT_FILENO);
779 dup2(fd, STDERR_FILENO);
781 if (fd > STDERR_FILENO)
784 /* set scheduling priority for the daemon */
785 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
791 /* OOM_DISABLE == -17 */
792 fd = open("/proc/self/oom_adj", O_RDWR);
794 err(udev, "error disabling OOM: %m\n");
800 fd = open("/dev/kmsg", O_WRONLY);
802 const char *ver_str = "<6>udev: starting version " VERSION "\n";
803 char path[UTIL_PATH_SIZE];
806 write(fd, ver_str, strlen(ver_str));
807 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
808 util_strlcat(path, "/class/mem/null", sizeof(path));
809 if (lstat(path, &statbuf) == 0) {
810 if (S_ISDIR(statbuf.st_mode)) {
811 const char *depr_str = "<6>udev: deprecated sysfs layout (kernel too old, "
812 "or CONFIG_SYSFS_DEPRECATED) is unsupported, some "
813 "udev features may fail\n";
815 write(fd, depr_str, strlen(depr_str));
821 /* set signal handlers */
822 memset(&act, 0x00, sizeof(struct sigaction));
823 act.sa_handler = (void (*)(int)) sig_handler;
824 sigemptyset(&act.sa_mask);
825 act.sa_flags = SA_RESTART;
826 sigaction(SIGINT, &act, NULL);
827 sigaction(SIGTERM, &act, NULL);
828 sigaction(SIGCHLD, &act, NULL);
829 sigaction(SIGHUP, &act, NULL);
831 /* watch rules directory */
832 inotify_fd = inotify_init();
833 if (inotify_fd >= 0) {
834 if (udev_get_rules_path(udev) != NULL) {
835 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
836 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
838 char filename[PATH_MAX];
840 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
841 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
842 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
843 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
845 /* watch dynamic rules directory */
846 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
847 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
848 inotify_add_watch(inotify_fd, filename,
849 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
851 } else if (errno == ENOSYS)
852 err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
854 err(udev, "inotify_init failed: %m\n");
856 /* maximum limit of forked childs */
857 value = getenv("UDEVD_MAX_CHILDS");
859 max_childs = strtoul(value, NULL, 10);
861 int memsize = mem_size_mb();
863 max_childs = 128 + (memsize / 4);
865 max_childs = UDEVD_MAX_CHILDS;
867 info(udev, "initialize max_childs to %u\n", max_childs);
869 maxfd = udev_ctrl_get_fd(udev_ctrl);
870 maxfd = UDEV_MAX(maxfd, udev_monitor_get_fd(kernel_monitor));
871 maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
872 maxfd = UDEV_MAX(maxfd, inotify_fd);
877 FD_SET(signal_pipe[READ_END], &readfds);
878 FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
879 FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
881 FD_SET(inotify_fd, &readfds);
882 fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
885 err(udev, "error in select: %m\n");
889 /* get control message */
890 if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
891 handle_ctrl_msg(udev_ctrl);
893 /* get kernel uevent */
894 if (FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
895 struct udev_device *dev;
897 dev = udev_monitor_receive_device(kernel_monitor);
899 struct udev_event *event;
901 event = udev_event_new(dev);
903 event_queue_insert(event);
905 udev_device_unref(dev);
909 /* received a signal, clear our notification pipe */
910 if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
913 read(signal_pipe[READ_END], &buf, sizeof(buf));
916 /* rules directory inotify watch */
917 if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
920 /* discard all possible events, we can just reload the config */
921 if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
925 buf = malloc(nbytes);
927 err(udev, "error getting buffer for inotify, disable watching\n");
931 read(inotify_fd, buf, nbytes);
936 /* rules changed, set by inotify or a HUP signal */
939 udev_rules_cleanup(&rules);
940 udev_rules_init(udev, &rules, 1);
943 if (sigchilds_waiting) {
944 sigchilds_waiting = 0;
951 event_queue_manager(udev);
957 udev_rules_cleanup(&rules);
959 if (signal_pipe[READ_END] >= 0)
960 close(signal_pipe[READ_END]);
961 if (signal_pipe[WRITE_END] >= 0)
962 close(signal_pipe[WRITE_END]);
964 udev_ctrl_unref(udev_ctrl);
967 udev_monitor_unref(kernel_monitor);