2 * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
31 #include <sys/select.h>
35 #include <sys/ioctl.h>
37 #include <sys/inotify.h>
42 #define UDEVD_PRIORITY -4
43 #define UDEV_PRIORITY -2
45 /* maximum limit of forked childs */
46 #define UDEVD_MAX_CHILDS 256
50 static void log_fn(struct udev *udev, int priority,
51 const char *file, int line, const char *fn,
52 const char *format, va_list args)
55 fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
56 vfprintf(stderr, format, args);
58 vsyslog(priority, format, args);
62 static void reap_sigchilds(void);
64 static int debug_trace;
65 static struct udev_rules *rules;
66 static struct udev_ctrl *udev_ctrl;
67 static struct udev_monitor *kernel_monitor;
68 static volatile int sigchilds_waiting;
69 static volatile int udev_exit;
70 static volatile int reload_config;
71 static volatile int signal_received;
72 static int run_exec_q;
73 static int stop_exec_q;
74 static int max_childs;
76 static struct udev_list_node event_list;
84 static struct udev_event *node_to_event(struct udev_list_node *node)
89 event -= offsetof(struct udev_event, node);
90 return (struct udev_event *)event;
93 static void export_event_state(struct udev_event *event, enum event_state state)
95 char filename[UTIL_PATH_SIZE];
96 char filename_failed[UTIL_PATH_SIZE];
99 /* location of queue file */
100 snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu",
101 udev_get_dev_path(event->udev), udev_device_get_seqnum(event->dev));
103 /* location of failed file */
104 util_strlcpy(filename_failed, udev_get_dev_path(event->udev), sizeof(filename_failed));
105 util_strlcat(filename_failed, "/", sizeof(filename_failed));
106 start = util_strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
107 util_strlcat(filename_failed, udev_device_get_devpath(event->dev), sizeof(filename_failed));
108 util_path_encode(&filename_failed[start], sizeof(filename_failed) - start);
112 if(unlink(filename_failed) == 0)
113 util_delete_path(event->udev, filename_failed);
114 util_create_path(event->udev, filename);
115 udev_selinux_setfscreatecon(event->udev, filename, S_IFLNK);
116 symlink(udev_device_get_devpath(event->dev), filename);
117 udev_selinux_resetfscreatecon(event->udev);
120 if (udev_device_get_devpath_old(event->dev) != NULL) {
121 /* "move" event - rename failed file to current name, do not delete failed */
122 char filename_failed_old[UTIL_PATH_SIZE];
124 util_strlcpy(filename_failed_old, udev_get_dev_path(event->udev), sizeof(filename_failed_old));
125 util_strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
126 start = util_strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
127 util_strlcat(filename_failed_old, udev_device_get_devpath_old(event->dev), sizeof(filename_failed_old));
128 util_path_encode(&filename_failed_old[start], sizeof(filename) - start);
130 if (rename(filename_failed_old, filename_failed) == 0)
131 info(event->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
132 udev_device_get_devpath_old(event->dev), udev_device_get_devpath(event->dev));
134 if (unlink(filename_failed) == 0)
135 util_delete_path(event->udev, filename_failed);
140 /* clean up possibly empty queue directory */
141 if (udev_list_is_empty(&event_list))
142 util_delete_path(event->udev, filename);
145 /* move failed event to the failed directory */
146 util_create_path(event->udev, filename_failed);
147 rename(filename, filename_failed);
149 /* clean up possibly empty queue directory */
150 if (udev_list_is_empty(&event_list))
151 util_delete_path(event->udev, filename);
158 static void event_queue_delete(struct udev_event *event)
160 udev_list_node_remove(&event->node);
162 /* mark as failed, if "add" event returns non-zero */
163 if (event->exitstatus && strcmp(udev_device_get_action(event->dev), "add") == 0)
164 export_event_state(event, EVENT_FAILED);
166 export_event_state(event, EVENT_FINISHED);
168 udev_device_unref(event->dev);
169 udev_event_unref(event);
172 static void asmlinkage event_sig_handler(int signum)
174 if (signum == SIGALRM)
178 static void event_fork(struct udev_event *event)
181 struct sigaction act;
186 fprintf(stderr, "fork %s (%llu)\n",
187 udev_device_get_syspath(event->dev),
188 udev_device_get_seqnum(event->dev));
195 udev_monitor_unref(kernel_monitor);
196 udev_ctrl_unref(udev_ctrl);
198 logging_init("udevd-event");
199 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
201 /* set signal handlers */
202 memset(&act, 0x00, sizeof(act));
203 act.sa_handler = (void (*)(int)) event_sig_handler;
204 sigemptyset (&act.sa_mask);
206 sigaction(SIGALRM, &act, NULL);
208 /* reset to default */
209 act.sa_handler = SIG_DFL;
210 sigaction(SIGINT, &act, NULL);
211 sigaction(SIGTERM, &act, NULL);
212 sigaction(SIGCHLD, &act, NULL);
213 sigaction(SIGHUP, &act, NULL);
215 /* set timeout to prevent hanging processes */
216 alarm(UDEV_EVENT_TIMEOUT);
218 /* apply rules, create node, symlinks */
219 err = udev_event_execute_rules(event, rules);
221 /* rules may change/disable the timeout */
222 if (udev_device_get_event_timeout(event->dev) >= 0)
223 alarm(udev_device_get_event_timeout(event->dev));
226 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
227 udev_event_execute_run(event);
229 /* apply/restore inotify watch */
230 if (err == 0 && event->inotify_watch && inotify_fd != -1 &&
231 major(udev_device_get_devnum(event->dev)) != 0 &&
232 strcmp(udev_device_get_action(event->dev), "remove") != 0) {
233 info(event->udev, "device will be watched for changes\n");
234 udev_watch_begin(event->udev, event->dev);
236 udev_watch_clear(event->udev, event->dev);
239 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
245 err(event->udev, "fork of child failed: %m\n");
246 event_queue_delete(event);
249 /* get SIGCHLD in main loop */
250 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
251 udev_device_get_seqnum(event->dev),
253 udev_device_get_action(event->dev),
254 udev_device_get_subsystem(event->dev),
255 time(NULL) - event->queue_time);
261 static void event_queue_insert(struct udev_event *event)
263 char filename[UTIL_PATH_SIZE];
266 event->queue_time = time(NULL);
268 export_event_state(event, EVENT_QUEUED);
269 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
270 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
272 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
273 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
274 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
279 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
285 udev_list_node_append(&event->node, &event_list);
288 /* run all events with a timeout set immediately */
289 if (udev_device_get_timeout(event->dev) > 0) {
295 static int mem_size_mb(void)
299 long int memsize = -1;
301 f = fopen("/proc/meminfo", "r");
305 while (fgets(buf, sizeof(buf), f) != NULL) {
308 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
309 memsize = value / 1024;
318 static int compare_devpath(const char *running, const char *waiting)
322 while (running[i] != '\0' && running[i] == waiting[i])
325 /* identical device event found */
326 if (running[i] == '\0' && waiting[i] == '\0')
329 /* parent device event found */
330 if (running[i] == '\0' && waiting[i] == '/')
333 /* child device event found */
334 if (running[i] == '/' && waiting[i] == '\0')
337 /* no matching event */
341 /* lookup event for identical, parent, child, or physical device */
342 static int devpath_busy(struct udev_event *event)
344 struct udev_list_node *loop;
346 if (event->delaying_seqnum > 0) {
348 /* check if queue contains events we depend on */
349 udev_list_node_foreach(loop, &event_list) {
350 struct udev_event *loop_event = node_to_event(loop);
352 /* we already found a later event, earlier can not block us, no need to check again */
353 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
356 /* event we checked earlier still exists, no need to check again */
357 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
360 /* found ourself, no later event can block us */
361 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
364 /* check our old name */
365 if (udev_device_get_devpath_old(event->dev) != NULL)
366 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
367 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
371 /* check identical, parent, or child device event */
372 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
373 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
374 udev_device_get_seqnum(event->dev),
375 udev_device_get_seqnum(loop_event->dev),
376 udev_device_get_devpath(loop_event->dev));
377 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
381 /* check for our major:minor number */
382 if (major(udev_device_get_devnum(event->dev)) > 0 &&
383 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
384 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
385 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
386 udev_device_get_seqnum(event->dev),
387 udev_device_get_seqnum(loop_event->dev),
388 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
389 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
393 /* check physical device event (special case of parent) */
394 if (udev_device_get_physdevpath(event->dev) != NULL &&
395 strcmp(udev_device_get_action(event->dev), "add") == 0)
396 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
397 udev_device_get_physdevpath(event->dev)) != 0) {
398 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
399 udev_device_get_seqnum(event->dev),
400 udev_device_get_seqnum(loop_event->dev),
401 udev_device_get_devpath(loop_event->dev));
402 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
409 /* serializes events for the identical and parent and child devices */
410 static void event_queue_manager(struct udev *udev)
412 struct udev_list_node *loop;
413 struct udev_list_node *tmp;
416 if (udev_list_is_empty(&event_list)) {
418 err(udev, "event list empty, but childs count is %i", childs);
424 udev_list_node_foreach_safe(loop, tmp, &event_list) {
425 struct udev_event *loop_event = node_to_event(loop);
427 if (childs >= max_childs) {
428 info(udev, "maximum number (%i) of childs reached\n", childs);
432 if (loop_event->pid != 0)
435 /* do not start event if parent or child event is still running */
436 if (devpath_busy(loop_event) != 0) {
437 dbg(udev, "delay seq %llu (%s)\n",
438 udev_device_get_seqnum(loop_event->dev),
439 udev_device_get_devpath(loop_event->dev));
443 event_fork(loop_event);
444 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
446 /* retry if events finished in the meantime */
447 if (sigchilds_waiting) {
448 sigchilds_waiting = 0;
455 /* receive the udevd message from userspace */
456 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
458 struct udev *udev = udev_ctrl_get_udev(uctrl);
459 struct udev_ctrl_msg *ctrl_msg;
463 ctrl_msg = udev_ctrl_receive_msg(uctrl);
464 if (ctrl_msg == NULL)
467 i = udev_ctrl_get_set_log_level(ctrl_msg);
469 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
470 udev_set_log_priority(udev, i);
473 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
474 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
478 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
479 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
481 event_queue_manager(udev);
484 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
485 info(udev, "udevd message (RELOAD_RULES) received\n");
489 str = udev_ctrl_get_set_env(ctrl_msg);
497 val = strchr(key, '=');
501 if (val[0] == '\0') {
502 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
503 udev_add_property(udev, key, NULL);
505 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
506 udev_add_property(udev, key, val);
509 err(udev, "wrong key format '%s'\n", key);
515 i = udev_ctrl_get_set_max_childs(ctrl_msg);
517 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
520 udev_ctrl_msg_unref(ctrl_msg);
523 /* read inotify messages */
524 static int handle_inotify(struct udev *udev)
528 struct inotify_event *ev;
530 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
533 buf = malloc(nbytes);
535 err(udev, "error getting buffer for inotify, disable watching\n");
541 read(inotify_fd, buf, nbytes);
543 for (pos = 0, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
546 dbg(udev, "inotify event: %x for %d (%s)\n", ev->mask, ev->wd, ev->len ? ev->name : "*");
548 syspath = udev_watch_lookup(udev, ev->wd);
549 if (syspath != NULL) {
550 dbg(udev, "inotify event: %x for %s\n", ev->mask, syspath);
551 if (ev->mask & IN_CLOSE_WRITE) {
552 char filename[UTIL_PATH_SIZE];
555 info(udev, "device %s closed, synthesising 'change'\n", syspath);
556 util_strlcpy(filename, syspath, sizeof(filename));
557 util_strlcat(filename, "/uevent", sizeof(filename));
558 fd = open(filename, O_WRONLY);
559 if (fd < 0 || write(fd, "change", 6) < 0)
560 info(udev, "error writing uevent: %m\n");
563 if (ev->mask & IN_IGNORED)
564 udev_watch_end(udev, ev->wd);
574 static void asmlinkage sig_handler(int signum)
582 /* set flag, then write to pipe if needed */
583 sigchilds_waiting = 1;
593 static void udev_done(int pid, int exitstatus)
595 struct udev_list_node *loop;
597 /* find event associated with pid and delete it */
598 udev_list_node_foreach(loop, &event_list) {
599 struct udev_event *loop_event = node_to_event(loop);
601 if (loop_event->pid == pid) {
602 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
603 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
604 exitstatus, time(NULL) - loop_event->queue_time);
605 loop_event->exitstatus = exitstatus;
607 fprintf(stderr, "exit %s (%llu)\n",
608 udev_device_get_syspath(loop_event->dev),
609 udev_device_get_seqnum(loop_event->dev));
610 event_queue_delete(loop_event);
613 /* there may be dependent events waiting */
620 static void reap_sigchilds(void)
626 pid = waitpid(-1, &status, WNOHANG);
629 if (WIFEXITED(status))
630 status = WEXITSTATUS(status);
631 else if (WIFSIGNALED(status))
632 status = WTERMSIG(status) + 128;
635 udev_done(pid, status);
639 static void cleanup_queue_dir(struct udev *udev)
641 char dirname[UTIL_PATH_SIZE];
642 char filename[UTIL_PATH_SIZE];
645 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
646 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
649 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
650 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
651 dir = opendir(dirname);
657 if (dent == NULL || dent->d_name[0] == '\0')
659 if (dent->d_name[0] == '.')
661 util_strlcpy(filename, dirname, sizeof(filename));
662 util_strlcat(filename, "/", sizeof(filename));
663 util_strlcat(filename, dent->d_name, sizeof(filename));
671 static void export_initial_seqnum(struct udev *udev)
673 char filename[UTIL_PATH_SIZE];
678 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
679 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
680 fd = open(filename, O_RDONLY);
682 len = read(fd, seqnum, sizeof(seqnum)-1);
686 strcpy(seqnum, "0\n");
689 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
690 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
691 util_create_path(udev, filename);
692 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
694 write(fd, seqnum, len);
699 int main(int argc, char *argv[])
703 struct sigaction act;
706 int resolve_names = 1;
707 static const struct option options[] = {
708 { "daemon", no_argument, NULL, 'd' },
709 { "debug-trace", no_argument, NULL, 't' },
710 { "debug", no_argument, NULL, 'D' },
711 { "help", no_argument, NULL, 'h' },
712 { "version", no_argument, NULL, 'V' },
713 { "resolve-names", required_argument, NULL, 'N' },
722 logging_init("udevd");
723 udev_set_log_fn(udev, log_fn);
724 info(udev, "version %s\n", VERSION);
725 udev_selinux_init(udev);
730 option = getopt_long(argc, argv, "dDthV", options, NULL);
743 if (udev_get_log_priority(udev) < LOG_INFO)
744 udev_set_log_priority(udev, LOG_INFO);
747 if (strcmp (optarg, "early") == 0) {
749 } else if (strcmp (optarg, "late") == 0) {
751 } else if (strcmp (optarg, "never") == 0) {
754 fprintf(stderr, "resolve-names must be early, late or never\n");
755 err(udev, "resolve-names must be early, late or never\n");
760 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
761 "[--resolve-names=early|late|never] [--version]\n");
764 printf("%s\n", VERSION);
772 fprintf(stderr, "root privileges required\n");
773 err(udev, "root privileges required\n");
777 /* make sure std{in,out,err} fd's are in a sane state */
778 fd = open("/dev/null", O_RDWR);
780 fprintf(stderr, "cannot open /dev/null\n");
781 err(udev, "cannot open /dev/null\n");
783 if (write(STDOUT_FILENO, 0, 0) < 0)
784 dup2(fd, STDOUT_FILENO);
785 if (write(STDERR_FILENO, 0, 0) < 0)
786 dup2(fd, STDERR_FILENO);
788 /* init control socket, bind() ensures, that only one udevd instance is running */
789 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
790 if (udev_ctrl == NULL) {
791 fprintf(stderr, "error initializing control socket");
792 err(udev, "error initializing udevd socket");
797 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
798 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
799 err(udev, "error binding control socket, seems udevd is already running\n");
804 kernel_monitor = udev_monitor_new_from_netlink(udev);
805 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
806 fprintf(stderr, "error initializing netlink socket\n");
807 err(udev, "error initializing netlink socket\n");
811 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
813 rules = udev_rules_new(udev, resolve_names);
815 err(udev, "error reading rules\n");
818 udev_list_init(&event_list);
819 cleanup_queue_dir(udev);
820 export_initial_seqnum(udev);
828 dbg(udev, "daemonized fork running\n");
831 err(udev, "fork of daemon failed: %m\n");
835 dbg(udev, "child [%u] running, parent exits\n", pid);
841 /* redirect std{out,err} */
842 if (!debug && !debug_trace) {
843 dup2(fd, STDIN_FILENO);
844 dup2(fd, STDOUT_FILENO);
845 dup2(fd, STDERR_FILENO);
847 if (fd > STDERR_FILENO)
850 /* set scheduling priority for the daemon */
851 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
857 /* OOM_DISABLE == -17 */
858 fd = open("/proc/self/oom_adj", O_RDWR);
860 err(udev, "error disabling OOM: %m\n");
866 fd = open("/dev/kmsg", O_WRONLY);
868 const char *ver_str = "<6>udev: starting version " VERSION "\n";
869 char path[UTIL_PATH_SIZE];
872 write(fd, ver_str, strlen(ver_str));
873 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
874 util_strlcat(path, "/class/mem/null", sizeof(path));
875 if (lstat(path, &statbuf) == 0) {
876 if (S_ISDIR(statbuf.st_mode)) {
877 const char *depr_str =
878 "<6>udev: deprecated sysfs layout; update the kernel or "
879 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
880 "not work correctly\n";
882 write(fd, depr_str, strlen(depr_str));
888 /* set signal handlers */
889 memset(&act, 0x00, sizeof(struct sigaction));
890 act.sa_handler = (void (*)(int)) sig_handler;
891 sigemptyset(&act.sa_mask);
892 act.sa_flags = SA_RESTART;
893 sigaction(SIGINT, &act, NULL);
894 sigaction(SIGTERM, &act, NULL);
895 sigaction(SIGCHLD, &act, NULL);
896 sigaction(SIGHUP, &act, NULL);
898 /* watch rules directory */
899 udev_watch_init(udev);
900 if (inotify_fd >= 0) {
901 if (udev_get_rules_path(udev) != NULL) {
902 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
903 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
905 char filename[UTIL_PATH_SIZE];
907 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
908 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
909 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
910 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
912 /* watch dynamic rules directory */
913 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
914 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
915 inotify_add_watch(inotify_fd, filename,
916 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
919 udev_watch_restore(udev);
922 /* in trace mode run one event after the other */
926 int memsize = mem_size_mb();
928 max_childs = 128 + (memsize / 4);
930 max_childs = UDEVD_MAX_CHILDS;
932 /* possibly overwrite maximum limit of executed events */
933 value = getenv("UDEVD_MAX_CHILDS");
935 max_childs = strtoul(value, NULL, 10);
936 info(udev, "initialize max_childs to %u\n", max_childs);
939 sigset_t blocked_mask, orig_mask;
940 struct pollfd pfd[4];
941 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
945 sigfillset(&blocked_mask);
946 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
947 if (signal_received) {
948 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
952 ctrl_poll = &pfd[nfds++];
953 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
954 ctrl_poll->events = POLLIN;
956 monitor_poll = &pfd[nfds++];
957 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
958 monitor_poll->events = POLLIN;
960 if (inotify_fd >= 0) {
961 inotify_poll = &pfd[nfds++];
962 inotify_poll->fd = inotify_fd;
963 inotify_poll->events = POLLIN;
966 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
967 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
971 err(udev, "error in select: %m\n");
975 /* get control message */
976 if (ctrl_poll->revents & POLLIN)
977 handle_ctrl_msg(udev_ctrl);
979 /* get kernel uevent */
980 if (monitor_poll->revents & POLLIN) {
981 struct udev_device *dev;
983 dev = udev_monitor_receive_device(kernel_monitor);
985 struct udev_event *event;
987 event = udev_event_new(dev);
989 event_queue_insert(event);
991 udev_device_unref(dev);
995 /* rules directory inotify watch */
996 if (inotify_poll && (inotify_poll->revents & POLLIN))
997 handle_inotify(udev);
1000 signal_received = 0;
1002 /* rules changed, set by inotify or a HUP signal */
1003 if (reload_config) {
1004 struct udev_rules *rules_new;
1007 rules_new = udev_rules_new(udev, resolve_names);
1008 if (rules_new != NULL) {
1009 udev_rules_unref(rules);
1014 if (sigchilds_waiting) {
1015 sigchilds_waiting = 0;
1022 event_queue_manager(udev);
1025 cleanup_queue_dir(udev);
1028 udev_rules_unref(rules);
1029 udev_ctrl_unref(udev_ctrl);
1030 if (inotify_fd >= 0)
1032 udev_monitor_unref(kernel_monitor);
1033 udev_selinux_exit(udev);