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 sig_atomic_t sigchilds_waiting;
71 static volatile sig_atomic_t udev_exit;
72 static volatile sig_atomic_t reload_config;
73 static volatile sig_atomic_t 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 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_ctrl_unref(udev_ctrl);
200 logging_init("udevd-event");
201 setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
203 /* set signal handlers */
204 memset(&act, 0x00, sizeof(act));
205 act.sa_handler = event_sig_handler;
206 sigemptyset (&act.sa_mask);
208 sigaction(SIGALRM, &act, NULL);
210 /* reset to default */
211 act.sa_handler = SIG_DFL;
212 sigaction(SIGINT, &act, NULL);
213 sigaction(SIGTERM, &act, NULL);
214 sigaction(SIGCHLD, &act, NULL);
215 sigaction(SIGHUP, &act, NULL);
217 /* set timeout to prevent hanging processes */
218 alarm(UDEV_EVENT_TIMEOUT);
220 /* apply rules, create node, symlinks */
221 err = udev_event_execute_rules(event, rules);
223 /* rules may change/disable the timeout */
224 if (udev_device_get_event_timeout(event->dev) >= 0)
225 alarm(udev_device_get_event_timeout(event->dev));
228 if (err == 0 && !event->ignore_device && udev_get_run(event->udev))
229 udev_event_execute_run(event);
231 /* apply/restore inotify watch */
232 if (err == 0 && event->inotify_watch) {
233 udev_watch_begin(event->udev, event->dev);
234 udev_device_update_db(event->dev);
237 /* send processed event back to the kernel netlink socket */
238 udev_monitor_send_device(kernel_monitor, event->dev);
240 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
246 err(event->udev, "fork of child failed: %m\n");
247 event_queue_delete(event);
250 /* get SIGCHLD in main loop */
251 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
252 udev_device_get_seqnum(event->dev),
254 udev_device_get_action(event->dev),
255 udev_device_get_subsystem(event->dev),
256 time(NULL) - event->queue_time);
262 static void event_queue_insert(struct udev_event *event)
264 char filename[UTIL_PATH_SIZE];
267 event->queue_time = time(NULL);
269 export_event_state(event, EVENT_QUEUED);
270 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
271 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
273 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
274 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
275 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
280 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
286 udev_list_node_append(&event->node, &event_list);
289 /* run all events with a timeout set immediately */
290 if (udev_device_get_timeout(event->dev) > 0) {
296 static int mem_size_mb(void)
300 long int memsize = -1;
302 f = fopen("/proc/meminfo", "r");
306 while (fgets(buf, sizeof(buf), f) != NULL) {
309 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
310 memsize = value / 1024;
319 static int compare_devpath(const char *running, const char *waiting)
323 while (running[i] != '\0' && running[i] == waiting[i])
326 /* identical device event found */
327 if (running[i] == '\0' && waiting[i] == '\0')
330 /* parent device event found */
331 if (running[i] == '\0' && waiting[i] == '/')
334 /* child device event found */
335 if (running[i] == '/' && waiting[i] == '\0')
338 /* no matching event */
342 /* lookup event for identical, parent, child device */
343 static int devpath_busy(struct udev_event *event)
345 struct udev_list_node *loop;
347 if (event->delaying_seqnum > 0) {
349 /* check if queue contains events we depend on */
350 udev_list_node_foreach(loop, &event_list) {
351 struct udev_event *loop_event = node_to_event(loop);
353 /* we already found a later event, earlier can not block us, no need to check again */
354 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
357 /* event we checked earlier still exists, no need to check again */
358 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
361 /* found ourself, no later event can block us */
362 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
365 /* check our old name */
366 if (udev_device_get_devpath_old(event->dev) != NULL)
367 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
368 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
372 /* check identical, parent, or child device event */
373 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
374 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
375 udev_device_get_seqnum(event->dev),
376 udev_device_get_seqnum(loop_event->dev),
377 udev_device_get_devpath(loop_event->dev));
378 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
382 /* check for our major:minor number */
383 if (major(udev_device_get_devnum(event->dev)) > 0 &&
384 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
385 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
386 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
387 udev_device_get_seqnum(event->dev),
388 udev_device_get_seqnum(loop_event->dev),
389 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
390 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
397 /* serializes events for the identical and parent and child devices */
398 static void event_queue_manager(struct udev *udev)
400 struct udev_list_node *loop;
401 struct udev_list_node *tmp;
404 if (udev_list_is_empty(&event_list)) {
406 err(udev, "event list empty, but childs count is %i", childs);
412 udev_list_node_foreach_safe(loop, tmp, &event_list) {
413 struct udev_event *loop_event = node_to_event(loop);
415 if (childs >= max_childs) {
416 info(udev, "maximum number (%i) of childs reached\n", childs);
420 if (loop_event->pid != 0)
423 /* do not start event if parent or child event is still running */
424 if (devpath_busy(loop_event) != 0) {
425 dbg(udev, "delay seq %llu (%s)\n",
426 udev_device_get_seqnum(loop_event->dev),
427 udev_device_get_devpath(loop_event->dev));
431 event_fork(loop_event);
432 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
434 /* retry if events finished in the meantime */
435 if (sigchilds_waiting) {
436 sigchilds_waiting = 0;
443 /* receive the udevd message from userspace */
444 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
446 struct udev *udev = udev_ctrl_get_udev(uctrl);
447 struct udev_ctrl_msg *ctrl_msg;
451 ctrl_msg = udev_ctrl_receive_msg(uctrl);
452 if (ctrl_msg == NULL)
455 i = udev_ctrl_get_set_log_level(ctrl_msg);
457 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
458 udev_set_log_priority(udev, i);
461 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
462 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
466 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
467 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
469 event_queue_manager(udev);
472 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
473 info(udev, "udevd message (RELOAD_RULES) received\n");
477 str = udev_ctrl_get_set_env(ctrl_msg);
485 val = strchr(key, '=');
489 if (val[0] == '\0') {
490 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
491 udev_add_property(udev, key, NULL);
493 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
494 udev_add_property(udev, key, val);
497 err(udev, "wrong key format '%s'\n", key);
503 i = udev_ctrl_get_set_max_childs(ctrl_msg);
505 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
509 settle_pid = udev_ctrl_get_settle(ctrl_msg);
510 if (settle_pid > 0) {
511 info(udev, "udevd message (SETTLE) received\n");
513 udev_ctrl_msg_unref(ctrl_msg);
516 /* read inotify messages */
517 static int handle_inotify(struct udev *udev)
521 struct inotify_event *ev;
523 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
526 buf = malloc(nbytes);
528 err(udev, "error getting buffer for inotify, disable watching\n");
534 read(inotify_fd, buf, nbytes);
536 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
537 struct udev_device *dev;
539 ev = (struct inotify_event *)(buf + pos);
541 dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
546 dev = udev_watch_lookup(udev, ev->wd);
548 dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
549 if (ev->mask & IN_CLOSE_WRITE) {
550 char filename[UTIL_PATH_SIZE];
553 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
554 util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename));
555 util_strlcat(filename, "/uevent", sizeof(filename));
556 fd = open(filename, O_WRONLY);
557 if (fd < 0 || write(fd, "change", 6) < 0)
558 info(udev, "error writing uevent: %m\n");
561 if (ev->mask & IN_IGNORED)
562 udev_watch_end(udev, dev);
564 udev_device_unref(dev);
573 static void sig_handler(int signum)
581 /* set flag, then write to pipe if needed */
582 sigchilds_waiting = 1;
592 static void udev_done(int pid, int exitstatus)
594 struct udev_list_node *loop;
596 /* find event associated with pid and delete it */
597 udev_list_node_foreach(loop, &event_list) {
598 struct udev_event *loop_event = node_to_event(loop);
600 if (loop_event->pid == pid) {
601 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
602 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
603 exitstatus, time(NULL) - loop_event->queue_time);
604 loop_event->exitstatus = exitstatus;
606 fprintf(stderr, "exit %s (%llu)\n",
607 udev_device_get_syspath(loop_event->dev),
608 udev_device_get_seqnum(loop_event->dev));
609 event_queue_delete(loop_event);
612 /* there may be dependent events waiting */
619 static void reap_sigchilds(void)
625 pid = waitpid(-1, &status, WNOHANG);
628 if (WIFEXITED(status))
629 status = WEXITSTATUS(status);
630 else if (WIFSIGNALED(status))
631 status = WTERMSIG(status) + 128;
634 udev_done(pid, status);
638 static void cleanup_queue_dir(struct udev *udev)
640 char dirname[UTIL_PATH_SIZE];
641 char filename[UTIL_PATH_SIZE];
644 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
645 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
648 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
649 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
650 dir = opendir(dirname);
656 if (dent == NULL || dent->d_name[0] == '\0')
658 if (dent->d_name[0] == '.')
660 util_strlcpy(filename, dirname, sizeof(filename));
661 util_strlcat(filename, "/", sizeof(filename));
662 util_strlcat(filename, dent->d_name, sizeof(filename));
670 static void export_initial_seqnum(struct udev *udev)
672 char filename[UTIL_PATH_SIZE];
677 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
678 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
679 fd = open(filename, O_RDONLY);
681 len = read(fd, seqnum, sizeof(seqnum)-1);
685 strcpy(seqnum, "0\n");
688 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
689 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
690 util_create_path(udev, filename);
691 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
693 write(fd, seqnum, len);
698 static void startup_log(struct udev *udev)
701 char path[UTIL_PATH_SIZE];
704 f = fopen("/dev/kmsg", "w");
706 fprintf(f, "<6>udev: starting version " VERSION "\n");
708 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
709 util_strlcat(path, "/class/mem/null", sizeof(path));
710 if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) {
711 const char *depr_str =
712 "udev: missing sysfs features; please update the kernel "
713 "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; "
714 "udev may fail to work correctly";
717 fprintf(f, "<3>%s\n", depr_str);
718 err(udev, "%s\n", depr_str);
726 int main(int argc, char *argv[])
730 struct sigaction act;
733 int resolve_names = 1;
734 static const struct option options[] = {
735 { "daemon", no_argument, NULL, 'd' },
736 { "debug-trace", no_argument, NULL, 't' },
737 { "debug", no_argument, NULL, 'D' },
738 { "help", no_argument, NULL, 'h' },
739 { "version", no_argument, NULL, 'V' },
740 { "resolve-names", required_argument, NULL, 'N' },
749 logging_init("udevd");
750 udev_set_log_fn(udev, log_fn);
751 info(udev, "version %s\n", VERSION);
752 udev_selinux_init(udev);
757 option = getopt_long(argc, argv, "dDthV", options, NULL);
770 if (udev_get_log_priority(udev) < LOG_INFO)
771 udev_set_log_priority(udev, LOG_INFO);
774 if (strcmp (optarg, "early") == 0) {
776 } else if (strcmp (optarg, "late") == 0) {
778 } else if (strcmp (optarg, "never") == 0) {
781 fprintf(stderr, "resolve-names must be early, late or never\n");
782 err(udev, "resolve-names must be early, late or never\n");
787 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
788 "[--resolve-names=early|late|never] [--version]\n");
791 printf("%s\n", VERSION);
799 fprintf(stderr, "root privileges required\n");
800 err(udev, "root privileges required\n");
804 /* make sure std{in,out,err} fd's are in a sane state */
805 fd = open("/dev/null", O_RDWR);
807 fprintf(stderr, "cannot open /dev/null\n");
808 err(udev, "cannot open /dev/null\n");
810 if (write(STDOUT_FILENO, 0, 0) < 0)
811 dup2(fd, STDOUT_FILENO);
812 if (write(STDERR_FILENO, 0, 0) < 0)
813 dup2(fd, STDERR_FILENO);
815 /* init control socket, bind() ensures, that only one udevd instance is running */
816 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
817 if (udev_ctrl == NULL) {
818 fprintf(stderr, "error initializing control socket");
819 err(udev, "error initializing udevd socket");
824 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
825 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
826 err(udev, "error binding control socket, seems udevd is already running\n");
831 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
832 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
833 fprintf(stderr, "error initializing netlink socket\n");
834 err(udev, "error initializing netlink socket\n");
838 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
840 rules = udev_rules_new(udev, resolve_names);
842 err(udev, "error reading rules\n");
845 udev_list_init(&event_list);
846 cleanup_queue_dir(udev);
847 export_initial_seqnum(udev);
855 dbg(udev, "daemonized fork running\n");
858 err(udev, "fork of daemon failed: %m\n");
862 dbg(udev, "child [%u] running, parent exits\n", pid);
868 /* redirect std{out,err} */
869 if (!debug && !debug_trace) {
870 dup2(fd, STDIN_FILENO);
871 dup2(fd, STDOUT_FILENO);
872 dup2(fd, STDERR_FILENO);
874 if (fd > STDERR_FILENO)
877 /* set scheduling priority for the daemon */
878 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
884 /* OOM_DISABLE == -17 */
885 fd = open("/proc/self/oom_adj", O_RDWR);
887 err(udev, "error disabling OOM: %m\n");
895 /* set signal handlers */
896 memset(&act, 0x00, sizeof(struct sigaction));
897 act.sa_handler = sig_handler;
898 sigemptyset(&act.sa_mask);
899 act.sa_flags = SA_RESTART;
900 sigaction(SIGINT, &act, NULL);
901 sigaction(SIGTERM, &act, NULL);
902 sigaction(SIGCHLD, &act, NULL);
903 sigaction(SIGHUP, &act, NULL);
905 /* watch rules directory */
906 udev_watch_init(udev);
907 if (inotify_fd >= 0) {
908 if (udev_get_rules_path(udev) != NULL) {
909 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
910 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
912 char filename[UTIL_PATH_SIZE];
914 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
915 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
916 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
917 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
919 /* watch dynamic rules directory */
920 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
921 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
922 inotify_add_watch(inotify_fd, filename,
923 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
926 udev_watch_restore(udev);
929 /* in trace mode run one event after the other */
933 int memsize = mem_size_mb();
935 max_childs = 128 + (memsize / 4);
937 max_childs = UDEVD_MAX_CHILDS;
939 /* possibly overwrite maximum limit of executed events */
940 value = getenv("UDEVD_MAX_CHILDS");
942 max_childs = strtoul(value, NULL, 10);
943 info(udev, "initialize max_childs to %u\n", max_childs);
946 sigset_t blocked_mask, orig_mask;
947 struct pollfd pfd[4];
948 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
952 sigfillset(&blocked_mask);
953 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
954 if (signal_received) {
955 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
959 ctrl_poll = &pfd[nfds++];
960 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
961 ctrl_poll->events = POLLIN;
963 monitor_poll = &pfd[nfds++];
964 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
965 monitor_poll->events = POLLIN;
967 if (inotify_fd >= 0) {
968 inotify_poll = &pfd[nfds++];
969 inotify_poll->fd = inotify_fd;
970 inotify_poll->events = POLLIN;
973 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
974 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
978 err(udev, "error in select: %m\n");
982 /* get control message */
983 if (ctrl_poll->revents & POLLIN)
984 handle_ctrl_msg(udev_ctrl);
986 /* get kernel uevent */
987 if (monitor_poll->revents & POLLIN) {
988 struct udev_device *dev;
990 dev = udev_monitor_receive_device(kernel_monitor);
992 struct udev_event *event;
994 event = udev_event_new(dev);
996 event_queue_insert(event);
998 udev_device_unref(dev);
1002 /* rules directory inotify watch */
1003 if (inotify_poll && (inotify_poll->revents & POLLIN))
1004 handle_inotify(udev);
1007 signal_received = 0;
1009 /* rules changed, set by inotify or a HUP signal */
1010 if (reload_config) {
1011 struct udev_rules *rules_new;
1014 rules_new = udev_rules_new(udev, resolve_names);
1015 if (rules_new != NULL) {
1016 udev_rules_unref(rules);
1021 if (sigchilds_waiting) {
1022 sigchilds_waiting = 0;
1029 event_queue_manager(udev);
1032 if (settle_pid > 0) {
1033 kill(settle_pid, SIGUSR1);
1037 cleanup_queue_dir(udev);
1040 udev_rules_unref(rules);
1041 udev_ctrl_unref(udev_ctrl);
1042 if (inotify_fd >= 0)
1044 udev_monitor_unref(kernel_monitor);
1045 udev_selinux_exit(udev);