2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
4 * Copyright (C) 2009 Canonical Ltd.
5 * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
33 #include <sys/select.h>
37 #include <sys/ioctl.h>
39 #include <sys/inotify.h>
44 #define UDEVD_PRIORITY -4
45 #define UDEV_PRIORITY -2
47 /* maximum limit of forked childs */
48 #define UDEVD_MAX_CHILDS 256
52 static void log_fn(struct udev *udev, int priority,
53 const char *file, int line, const char *fn,
54 const char *format, va_list args)
57 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
58 vfprintf(stderr, format, args);
60 vsyslog(priority, format, args);
64 static void reap_sigchilds(void);
66 static int debug_trace;
67 static struct udev_rules *rules;
68 static struct udev_ctrl *udev_ctrl;
69 static struct udev_monitor *kernel_monitor;
70 static volatile int sigchilds_waiting;
71 static volatile int udev_exit;
72 static volatile int reload_config;
73 static volatile int signal_received;
74 static volatile pid_t settle_pid;
75 static int run_exec_q;
76 static int stop_exec_q;
77 static int max_childs;
79 static struct udev_list_node event_list;
87 static struct udev_event *node_to_event(struct udev_list_node *node)
92 event -= offsetof(struct udev_event, node);
93 return (struct udev_event *)event;
96 static void export_event_state(struct udev_event *event, enum event_state state)
98 char filename[UTIL_PATH_SIZE];
99 char filename_failed[UTIL_PATH_SIZE];
102 /* location of queue file */
103 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
104 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
106 /* location of failed file */
107 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
108 util_strlcat(filename_failed, "/", sizeof(filename_failed));
109 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
110 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
111 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
115 if(unlink(filename_failed) == 0)
116 util_delete_path(event->udev, filename_failed);
117 util_create_path(event->udev, filename);
118 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
119 symlink(udev_device_get_devpath(event->dev), filename);
120 udev_selinux_resetfscreatecon(event->udev);
123 if (udev_device_get_devpath_old(event->dev) != NULL) {
124 /* "move" event - rename failed file to current name, do not delete failed */
125 char filename_failed_old[UTIL_PATH_SIZE];
127 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
128 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
129 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
130 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
131 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
133 if (rename(filename_failed_old, filename_failed) == 0)
134 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
135 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
137 if (unlink(filename_failed) == 0)
138 util_delete_path(event->udev, filename_failed);
143 /* clean up possibly empty queue directory */
144 if (udev_list_is_empty(&event_list))
145 util_delete_path(event->udev, filename);
148 /* move failed event to the failed directory */
149 util_create_path(event->udev, filename_failed);
150 rename(filename, filename_failed);
152 /* clean up possibly empty queue directory */
153 if (udev_list_is_empty(&event_list))
154 util_delete_path(event->udev, filename);
161 static void event_queue_delete(struct udev_event *event)
163 udev_list_node_remove(&event->node);
165 /* mark as failed, if "add" event returns non-zero */
166 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
167 export_event_state(event, EVENT_FAILED);
169 export_event_state(event, EVENT_FINISHED);
171 udev_device_unref(event->dev);
172 udev_event_unref(event);
175 static void asmlinkage event_sig_handler(int signum)
177 if (signum == SIGALRM)
181 static void event_fork(struct udev_event *event)
184 struct sigaction act;
189 fprintf(stderr, "fork %s (%llu)\n",
190 udev_device_get_syspath(event->dev),
191 udev_device_get_seqnum(event->dev));
198 udev_monitor_unref(kernel_monitor);
199 udev_ctrl_unref(udev_ctrl);
201 logging_init("udevd-event");
202 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
204 /* set signal handlers */
205 memset(&act, 0x00, sizeof(act));
206 act.sa_handler = (void (*)(int)) event_sig_handler;
207 sigemptyset (&act.sa_mask);
209 sigaction(SIGALRM, &act, NULL);
211 /* reset to default */
212 act.sa_handler = SIG_DFL;
213 sigaction(SIGINT, &act, NULL);
214 sigaction(SIGTERM, &act, NULL);
215 sigaction(SIGCHLD, &act, NULL);
216 sigaction(SIGHUP, &act, NULL);
218 /* set timeout to prevent hanging processes */
219 alarm(UDEV_EVENT_TIMEOUT);
221 /* apply rules, create node, symlinks */
222 err = udev_event_execute_rules(event, rules);
224 /* rules may change/disable the timeout */
225 if (udev_device_get_event_timeout(event->dev) >= 0)
226 alarm(udev_device_get_event_timeout(event->dev));
229 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
230 udev_event_execute_run(event);
232 /* apply/restore inotify watch */
233 if (err == 0 && event->inotify_watch) {
234 udev_watch_begin(event->udev, event->dev);
235 udev_device_update_db(event->dev);
238 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
244 err(event->udev, "fork of child failed: %m\n");
245 event_queue_delete(event);
248 /* get SIGCHLD in main loop */
249 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
250 udev_device_get_seqnum(event->dev),
252 udev_device_get_action(event->dev),
253 udev_device_get_subsystem(event->dev),
254 time(NULL) - event->queue_time);
260 static void event_queue_insert(struct udev_event *event)
262 char filename[UTIL_PATH_SIZE];
265 event->queue_time = time(NULL);
267 export_event_state(event, EVENT_QUEUED);
268 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
269 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
271 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
272 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
273 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
278 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
284 udev_list_node_append(&event->node, &event_list);
287 /* run all events with a timeout set immediately */
288 if (udev_device_get_timeout(event->dev) > 0) {
294 static int mem_size_mb(void)
298 long int memsize = -1;
300 f = fopen("/proc/meminfo", "r");
304 while (fgets(buf, sizeof(buf), f) != NULL) {
307 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
308 memsize = value / 1024;
317 static int compare_devpath(const char *running, const char *waiting)
321 while (running[i] != '\0' && running[i] == waiting[i])
324 /* identical device event found */
325 if (running[i] == '\0' && waiting[i] == '\0')
328 /* parent device event found */
329 if (running[i] == '\0' && waiting[i] == '/')
332 /* child device event found */
333 if (running[i] == '/' && waiting[i] == '\0')
336 /* no matching event */
340 /* lookup event for identical, parent, child, or physical device */
341 static int devpath_busy(struct udev_event *event)
343 struct udev_list_node *loop;
345 if (event->delaying_seqnum > 0) {
347 /* check if queue contains events we depend on */
348 udev_list_node_foreach(loop, &event_list) {
349 struct udev_event *loop_event = node_to_event(loop);
351 /* we already found a later event, earlier can not block us, no need to check again */
352 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
355 /* event we checked earlier still exists, no need to check again */
356 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
359 /* found ourself, no later event can block us */
360 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
363 /* check our old name */
364 if (udev_device_get_devpath_old(event->dev) != NULL)
365 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
366 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
370 /* check identical, parent, or child device event */
371 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
372 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
373 udev_device_get_seqnum(event->dev),
374 udev_device_get_seqnum(loop_event->dev),
375 udev_device_get_devpath(loop_event->dev));
376 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
380 /* check for our major:minor number */
381 if (major(udev_device_get_devnum(event->dev)) > 0 &&
382 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
383 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
384 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
385 udev_device_get_seqnum(event->dev),
386 udev_device_get_seqnum(loop_event->dev),
387 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
388 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
392 /* check physical device event (special case of parent) */
393 if (udev_device_get_physdevpath(event->dev) != NULL &&
394 strcmp(udev_device_get_action(event->dev), "add") == 0)
395 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
396 udev_device_get_physdevpath(event->dev)) != 0) {
397 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
398 udev_device_get_seqnum(event->dev),
399 udev_device_get_seqnum(loop_event->dev),
400 udev_device_get_devpath(loop_event->dev));
401 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
408 /* serializes events for the identical and parent and child devices */
409 static void event_queue_manager(struct udev *udev)
411 struct udev_list_node *loop;
412 struct udev_list_node *tmp;
415 if (udev_list_is_empty(&event_list)) {
417 err(udev, "event list empty, but childs count is %i", childs);
423 udev_list_node_foreach_safe(loop, tmp, &event_list) {
424 struct udev_event *loop_event = node_to_event(loop);
426 if (childs >= max_childs) {
427 info(udev, "maximum number (%i) of childs reached\n", childs);
431 if (loop_event->pid != 0)
434 /* do not start event if parent or child event is still running */
435 if (devpath_busy(loop_event) != 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 event_fork(loop_event);
443 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
445 /* retry if events finished in the meantime */
446 if (sigchilds_waiting) {
447 sigchilds_waiting = 0;
454 /* receive the udevd message from userspace */
455 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
457 struct udev *udev = udev_ctrl_get_udev(uctrl);
458 struct udev_ctrl_msg *ctrl_msg;
462 ctrl_msg = udev_ctrl_receive_msg(uctrl);
463 if (ctrl_msg == NULL)
466 i = udev_ctrl_get_set_log_level(ctrl_msg);
468 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
469 udev_set_log_priority(udev, i);
472 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
473 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
477 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
478 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
480 event_queue_manager(udev);
483 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
484 info(udev, "udevd message (RELOAD_RULES) received\n");
488 str = udev_ctrl_get_set_env(ctrl_msg);
496 val = strchr(key, '=');
500 if (val[0] == '\0') {
501 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
502 udev_add_property(udev, key, NULL);
504 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
505 udev_add_property(udev, key, val);
508 err(udev, "wrong key format '%s'\n", key);
514 i = udev_ctrl_get_set_max_childs(ctrl_msg);
516 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
520 settle_pid = udev_ctrl_get_settle(ctrl_msg);
521 if (settle_pid > 0) {
522 info(udev, "udevd message (SETTLE) received\n");
524 udev_ctrl_msg_unref(ctrl_msg);
527 /* read inotify messages */
528 static int handle_inotify(struct udev *udev)
532 struct inotify_event *ev;
534 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
537 buf = malloc(nbytes);
539 err(udev, "error getting buffer for inotify, disable watching\n");
545 read(inotify_fd, buf, nbytes);
547 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
548 struct udev_device *dev;
550 ev = (struct inotify_event *)(buf + pos);
552 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
557 dev = udev_watch_lookup(udev, ev->wd);
559 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
560 if (ev->mask & IN_CLOSE_WRITE) {
561 char filename[UTIL_PATH_SIZE];
564 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
565 util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
566 util_strlcat(filename, "/uevent", sizeof(filename));
567 fd = open(filename, O_WRONLY);
568 if (fd < 0 || write(fd, "change", 6) < 0)
569 info(udev, "error writing uevent: %m\n");
572 if (ev->mask & IN_IGNORED)
573 udev_watch_end(udev, dev);
575 udev_device_unref(dev);
584 static void asmlinkage sig_handler(int signum)
592 /* set flag, then write to pipe if needed */
593 sigchilds_waiting = 1;
603 static void udev_done(int pid, int exitstatus)
605 struct udev_list_node *loop;
607 /* find event associated with pid and delete it */
608 udev_list_node_foreach(loop, &event_list) {
609 struct udev_event *loop_event = node_to_event(loop);
611 if (loop_event->pid == pid) {
612 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
613 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
614 exitstatus, time(NULL) - loop_event->queue_time);
615 loop_event->exitstatus = exitstatus;
617 fprintf(stderr, "exit %s (%llu)\n",
618 udev_device_get_syspath(loop_event->dev),
619 udev_device_get_seqnum(loop_event->dev));
620 event_queue_delete(loop_event);
623 /* there may be dependent events waiting */
630 static void reap_sigchilds(void)
636 pid = waitpid(-1, &status, WNOHANG);
639 if (WIFEXITED(status))
640 status = WEXITSTATUS(status);
641 else if (WIFSIGNALED(status))
642 status = WTERMSIG(status) + 128;
645 udev_done(pid, status);
649 static void cleanup_queue_dir(struct udev *udev)
651 char dirname[UTIL_PATH_SIZE];
652 char filename[UTIL_PATH_SIZE];
655 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
656 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
659 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
660 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
661 dir = opendir(dirname);
667 if (dent == NULL || dent->d_name[0] == '\0')
669 if (dent->d_name[0] == '.')
671 util_strlcpy(filename, dirname, sizeof(filename));
672 util_strlcat(filename, "/", sizeof(filename));
673 util_strlcat(filename, dent->d_name, sizeof(filename));
681 static void export_initial_seqnum(struct udev *udev)
683 char filename[UTIL_PATH_SIZE];
688 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
689 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
690 fd = open(filename, O_RDONLY);
692 len = read(fd, seqnum, sizeof(seqnum)-1);
696 strcpy(seqnum, "0\n");
699 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
700 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
701 util_create_path(udev, filename);
702 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
704 write(fd, seqnum, len);
709 int main(int argc, char *argv[])
713 struct sigaction act;
716 int resolve_names = 1;
717 static const struct option options[] = {
718 { "daemon", no_argument, NULL, 'd' },
719 { "debug-trace", no_argument, NULL, 't' },
720 { "debug", no_argument, NULL, 'D' },
721 { "help", no_argument, NULL, 'h' },
722 { "version", no_argument, NULL, 'V' },
723 { "resolve-names", required_argument, NULL, 'N' },
732 logging_init("udevd");
733 udev_set_log_fn(udev, log_fn);
734 info(udev, "version %s\n", VERSION);
735 udev_selinux_init(udev);
740 option = getopt_long(argc, argv, "dDthV", options, NULL);
753 if (udev_get_log_priority(udev) < LOG_INFO)
754 udev_set_log_priority(udev, LOG_INFO);
757 if (strcmp (optarg, "early") == 0) {
759 } else if (strcmp (optarg, "late") == 0) {
761 } else if (strcmp (optarg, "never") == 0) {
764 fprintf(stderr, "resolve-names must be early, late or never\n");
765 err(udev, "resolve-names must be early, late or never\n");
770 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
771 "[--resolve-names=early|late|never] [--version]\n");
774 printf("%s\n", VERSION);
782 fprintf(stderr, "root privileges required\n");
783 err(udev, "root privileges required\n");
787 /* make sure std{in,out,err} fd's are in a sane state */
788 fd = open("/dev/null", O_RDWR);
790 fprintf(stderr, "cannot open /dev/null\n");
791 err(udev, "cannot open /dev/null\n");
793 if (write(STDOUT_FILENO, 0, 0) < 0)
794 dup2(fd, STDOUT_FILENO);
795 if (write(STDERR_FILENO, 0, 0) < 0)
796 dup2(fd, STDERR_FILENO);
798 /* init control socket, bind() ensures, that only one udevd instance is running */
799 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
800 if (udev_ctrl == NULL) {
801 fprintf(stderr, "error initializing control socket");
802 err(udev, "error initializing udevd socket");
807 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
808 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
809 err(udev, "error binding control socket, seems udevd is already running\n");
814 kernel_monitor = udev_monitor_new_from_netlink(udev);
815 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
816 fprintf(stderr, "error initializing netlink socket\n");
817 err(udev, "error initializing netlink socket\n");
821 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
823 rules = udev_rules_new(udev, resolve_names);
825 err(udev, "error reading rules\n");
828 udev_list_init(&event_list);
829 cleanup_queue_dir(udev);
830 export_initial_seqnum(udev);
838 dbg(udev, "daemonized fork running\n");
841 err(udev, "fork of daemon failed: %m\n");
845 dbg(udev, "child [%u] running, parent exits\n", pid);
851 /* redirect std{out,err} */
852 if (!debug && !debug_trace) {
853 dup2(fd, STDIN_FILENO);
854 dup2(fd, STDOUT_FILENO);
855 dup2(fd, STDERR_FILENO);
857 if (fd > STDERR_FILENO)
860 /* set scheduling priority for the daemon */
861 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
867 /* OOM_DISABLE == -17 */
868 fd = open("/proc/self/oom_adj", O_RDWR);
870 err(udev, "error disabling OOM: %m\n");
876 fd = open("/dev/kmsg", O_WRONLY);
878 const char *ver_str = "<6>udev: starting version " VERSION "\n";
879 char path[UTIL_PATH_SIZE];
882 write(fd, ver_str, strlen(ver_str));
883 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
884 util_strlcat(path, "/class/mem/null", sizeof(path));
885 if (lstat(path, &statbuf) == 0) {
886 if (S_ISDIR(statbuf.st_mode)) {
887 const char *depr_str =
888 "<6>udev: deprecated sysfs layout; update the kernel or "
889 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
890 "not work correctly\n";
892 write(fd, depr_str, strlen(depr_str));
898 /* set signal handlers */
899 memset(&act, 0x00, sizeof(struct sigaction));
900 act.sa_handler = (void (*)(int)) sig_handler;
901 sigemptyset(&act.sa_mask);
902 act.sa_flags = SA_RESTART;
903 sigaction(SIGINT, &act, NULL);
904 sigaction(SIGTERM, &act, NULL);
905 sigaction(SIGCHLD, &act, NULL);
906 sigaction(SIGHUP, &act, NULL);
908 /* watch rules directory */
909 udev_watch_init(udev);
910 if (inotify_fd >= 0) {
911 if (udev_get_rules_path(udev) != NULL) {
912 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
913 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
915 char filename[UTIL_PATH_SIZE];
917 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
918 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
919 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
920 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
922 /* watch dynamic rules directory */
923 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
924 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
925 inotify_add_watch(inotify_fd, filename,
926 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
929 udev_watch_restore(udev);
932 /* in trace mode run one event after the other */
936 int memsize = mem_size_mb();
938 max_childs = 128 + (memsize / 4);
940 max_childs = UDEVD_MAX_CHILDS;
942 /* possibly overwrite maximum limit of executed events */
943 value = getenv("UDEVD_MAX_CHILDS");
945 max_childs = strtoul(value, NULL, 10);
946 info(udev, "initialize max_childs to %u\n", max_childs);
949 sigset_t blocked_mask, orig_mask;
950 struct pollfd pfd[4];
951 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
955 sigfillset(&blocked_mask);
956 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
957 if (signal_received) {
958 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
962 ctrl_poll = &pfd[nfds++];
963 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
964 ctrl_poll->events = POLLIN;
966 monitor_poll = &pfd[nfds++];
967 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
968 monitor_poll->events = POLLIN;
970 if (inotify_fd >= 0) {
971 inotify_poll = &pfd[nfds++];
972 inotify_poll->fd = inotify_fd;
973 inotify_poll->events = POLLIN;
976 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
977 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
981 err(udev, "error in select: %m\n");
985 /* get control message */
986 if (ctrl_poll->revents & POLLIN)
987 handle_ctrl_msg(udev_ctrl);
989 /* get kernel uevent */
990 if (monitor_poll->revents & POLLIN) {
991 struct udev_device *dev;
993 dev = udev_monitor_receive_device(kernel_monitor);
995 struct udev_event *event;
997 event = udev_event_new(dev);
999 event_queue_insert(event);
1001 udev_device_unref(dev);
1005 /* rules directory inotify watch */
1006 if (inotify_poll && (inotify_poll->revents & POLLIN))
1007 handle_inotify(udev);
1010 signal_received = 0;
1012 /* rules changed, set by inotify or a HUP signal */
1013 if (reload_config) {
1014 struct udev_rules *rules_new;
1017 rules_new = udev_rules_new(udev, resolve_names);
1018 if (rules_new != NULL) {
1019 udev_rules_unref(rules);
1024 if (sigchilds_waiting) {
1025 sigchilds_waiting = 0;
1032 event_queue_manager(udev);
1035 if (settle_pid > 0) {
1036 kill(settle_pid, SIGUSR1);
1040 cleanup_queue_dir(udev);
1043 udev_rules_unref(rules);
1044 udev_ctrl_unref(udev_ctrl);
1045 if (inotify_fd >= 0)
1047 udev_monitor_unref(kernel_monitor);
1048 udev_selinux_exit(udev);