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 info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err);
235 err(event->udev, "fork of child failed: %m\n");
236 event_queue_delete(event);
239 /* get SIGCHLD in main loop */
240 info(event->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
241 udev_device_get_seqnum(event->dev),
243 udev_device_get_action(event->dev),
244 udev_device_get_subsystem(event->dev),
245 time(NULL) - event->queue_time);
251 static void event_queue_insert(struct udev_event *event)
253 char filename[UTIL_PATH_SIZE];
256 event->queue_time = time(NULL);
258 export_event_state(event, EVENT_QUEUED);
259 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(event->dev),
260 udev_device_get_action(event->dev), udev_device_get_subsystem(event->dev));
262 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
263 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
264 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
269 len = sprintf(str, "%llu\n", udev_device_get_seqnum(event->dev));
275 udev_list_node_append(&event->node, &event_list);
278 /* run all events with a timeout set immediately */
279 if (udev_device_get_timeout(event->dev) > 0) {
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 while (running[i] != '\0' && running[i] == waiting[i])
315 /* identical device event found */
316 if (running[i] == '\0' && waiting[i] == '\0')
319 /* parent device event found */
320 if (running[i] == '\0' && waiting[i] == '/')
323 /* child device event found */
324 if (running[i] == '/' && waiting[i] == '\0')
327 /* no matching event */
331 /* lookup event for identical, parent, child, or physical device */
332 static int devpath_busy(struct udev_event *event)
334 struct udev_list_node *loop;
336 if (event->delaying_seqnum > 0) {
338 /* check if queue contains events we depend on */
339 udev_list_node_foreach(loop, &event_list) {
340 struct udev_event *loop_event = node_to_event(loop);
342 /* we already found a later event, earlier can not block us, no need to check again */
343 if (udev_device_get_seqnum(loop_event->dev) < event->delaying_seqnum)
346 /* event we checked earlier still exists, no need to check again */
347 if (udev_device_get_seqnum(loop_event->dev) == event->delaying_seqnum)
350 /* found ourself, no later event can block us */
351 if (udev_device_get_seqnum(loop_event->dev) >= udev_device_get_seqnum(event->dev))
354 /* check our old name */
355 if (udev_device_get_devpath_old(event->dev) != NULL)
356 if (strcmp(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath_old(event->dev)) == 0) {
357 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
361 /* check identical, parent, or child device event */
362 if (compare_devpath(udev_device_get_devpath(loop_event->dev), udev_device_get_devpath(event->dev)) != 0) {
363 dbg(event->udev, "%llu, device event still pending %llu (%s)\n",
364 udev_device_get_seqnum(event->dev),
365 udev_device_get_seqnum(loop_event->dev),
366 udev_device_get_devpath(loop_event->dev));
367 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
371 /* check for our major:minor number */
372 if (major(udev_device_get_devnum(event->dev)) > 0 &&
373 udev_device_get_devnum(loop_event->dev) == udev_device_get_devnum(event->dev) &&
374 strcmp(udev_device_get_subsystem(event->dev), udev_device_get_subsystem(loop_event->dev)) == 0) {
375 dbg(event->udev, "%llu, device event still pending %llu (%d:%d)\n",
376 udev_device_get_seqnum(event->dev),
377 udev_device_get_seqnum(loop_event->dev),
378 major(udev_device_get_devnum(loop_event->dev)), minor(udev_device_get_devnum(loop_event->dev)));
379 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
383 /* check physical device event (special case of parent) */
384 if (udev_device_get_physdevpath(event->dev) != NULL &&
385 strcmp(udev_device_get_action(event->dev), "add") == 0)
386 if (compare_devpath(udev_device_get_devpath(loop_event->dev),
387 udev_device_get_physdevpath(event->dev)) != 0) {
388 dbg(event->udev, "%llu, physical device event still pending %llu (%s)\n",
389 udev_device_get_seqnum(event->dev),
390 udev_device_get_seqnum(loop_event->dev),
391 udev_device_get_devpath(loop_event->dev));
392 event->delaying_seqnum = udev_device_get_seqnum(loop_event->dev);
399 /* serializes events for the identical and parent and child devices */
400 static void event_queue_manager(struct udev *udev)
402 struct udev_list_node *loop;
403 struct udev_list_node *tmp;
406 if (udev_list_is_empty(&event_list)) {
408 err(udev, "event list empty, but childs count is %i", childs);
414 udev_list_node_foreach_safe(loop, tmp, &event_list) {
415 struct udev_event *loop_event = node_to_event(loop);
417 if (childs >= max_childs) {
418 info(udev, "maximum number (%i) of childs reached\n", childs);
422 if (loop_event->pid != 0)
425 /* do not start event if parent or child event is still running */
426 if (devpath_busy(loop_event) != 0) {
427 dbg(udev, "delay seq %llu (%s)\n",
428 udev_device_get_seqnum(loop_event->dev),
429 udev_device_get_devpath(loop_event->dev));
433 event_fork(loop_event);
434 dbg(udev, "moved seq %llu to running list\n", udev_device_get_seqnum(loop_event->dev));
436 /* retry if events finished in the meantime */
437 if (sigchilds_waiting) {
438 sigchilds_waiting = 0;
445 /* receive the udevd message from userspace */
446 static void handle_ctrl_msg(struct udev_ctrl *uctrl)
448 struct udev *udev = udev_ctrl_get_udev(uctrl);
449 struct udev_ctrl_msg *ctrl_msg;
453 ctrl_msg = udev_ctrl_receive_msg(uctrl);
454 if (ctrl_msg == NULL)
457 i = udev_ctrl_get_set_log_level(ctrl_msg);
459 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
460 udev_set_log_priority(udev, i);
463 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
464 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
468 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
469 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
471 event_queue_manager(udev);
474 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
475 info(udev, "udevd message (RELOAD_RULES) received\n");
479 str = udev_ctrl_get_set_env(ctrl_msg);
487 val = strchr(key, '=');
491 if (val[0] == '\0') {
492 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
493 udev_add_property(udev, key, NULL);
495 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
496 udev_add_property(udev, key, val);
499 err(udev, "wrong key format '%s'\n", key);
505 i = udev_ctrl_get_set_max_childs(ctrl_msg);
507 info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
510 udev_ctrl_msg_unref(ctrl_msg);
513 /* read inotify messages */
514 static int handle_inotify(struct udev *udev)
518 struct inotify_event *ev;
520 if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
523 buf = malloc(nbytes);
525 err(udev, "error getting buffer for inotify, disable watching\n");
531 read(inotify_fd, buf, nbytes);
533 for (pos = 0, ev = (struct inotify_event *)(buf + pos); pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
536 dbg(udev, "inotify event: %x for %d (%s)\n", ev->mask, ev->wd, ev->len ? ev->name : "*");
538 syspath = udev_watch_lookup(udev, ev->wd);
539 if (syspath != NULL) {
540 dbg(udev, "inotify event: %x for %s\n", ev->mask, syspath);
541 if (ev->mask & IN_CLOSE_WRITE) {
542 char filename[UTIL_PATH_SIZE];
545 info(udev, "device %s closed, synthesising 'change'\n", syspath);
546 util_strlcpy(filename, syspath, sizeof(filename));
547 util_strlcat(filename, "/uevent", sizeof(filename));
548 fd = open(filename, O_WRONLY);
549 if (fd < 0 || write(fd, "change", 6) < 0)
550 info(udev, "error writing uevent: %m\n");
553 if (ev->mask & IN_IGNORED)
554 udev_watch_end(udev, ev->wd);
564 static void asmlinkage sig_handler(int signum)
572 /* set flag, then write to pipe if needed */
573 sigchilds_waiting = 1;
583 static void udev_done(int pid, int exitstatus)
585 struct udev_list_node *loop;
587 /* find event associated with pid and delete it */
588 udev_list_node_foreach(loop, &event_list) {
589 struct udev_event *loop_event = node_to_event(loop);
591 if (loop_event->pid == pid) {
592 info(loop_event->udev, "seq %llu cleanup, pid [%d], status %i, %ld seconds old\n",
593 udev_device_get_seqnum(loop_event->dev), loop_event->pid,
594 exitstatus, time(NULL) - loop_event->queue_time);
595 loop_event->exitstatus = exitstatus;
597 fprintf(stderr, "exit %s (%llu)\n",
598 udev_device_get_syspath(loop_event->dev),
599 udev_device_get_seqnum(loop_event->dev));
600 event_queue_delete(loop_event);
603 /* there may be dependent events waiting */
610 static void reap_sigchilds(void)
616 pid = waitpid(-1, &status, WNOHANG);
619 if (WIFEXITED(status))
620 status = WEXITSTATUS(status);
621 else if (WIFSIGNALED(status))
622 status = WTERMSIG(status) + 128;
625 udev_done(pid, status);
629 static void cleanup_queue_dir(struct udev *udev)
631 char dirname[UTIL_PATH_SIZE];
632 char filename[UTIL_PATH_SIZE];
635 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
636 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
639 util_strlcpy(dirname, udev_get_dev_path(udev), sizeof(dirname));
640 util_strlcat(dirname, "/.udev/queue", sizeof(dirname));
641 dir = opendir(dirname);
647 if (dent == NULL || dent->d_name[0] == '\0')
649 if (dent->d_name[0] == '.')
651 util_strlcpy(filename, dirname, sizeof(filename));
652 util_strlcat(filename, "/", sizeof(filename));
653 util_strlcat(filename, dent->d_name, sizeof(filename));
661 static void export_initial_seqnum(struct udev *udev)
663 char filename[UTIL_PATH_SIZE];
668 util_strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
669 util_strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
670 fd = open(filename, O_RDONLY);
672 len = read(fd, seqnum, sizeof(seqnum)-1);
676 strcpy(seqnum, "0\n");
679 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
680 util_strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
681 util_create_path(udev, filename);
682 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
684 write(fd, seqnum, len);
689 int main(int argc, char *argv[])
693 struct sigaction act;
696 int resolve_names = 1;
697 static const struct option options[] = {
698 { "daemon", no_argument, NULL, 'd' },
699 { "debug-trace", no_argument, NULL, 't' },
700 { "debug", no_argument, NULL, 'D' },
701 { "help", no_argument, NULL, 'h' },
702 { "version", no_argument, NULL, 'V' },
703 { "resolve-names", required_argument, NULL, 'N' },
712 logging_init("udevd");
713 udev_set_log_fn(udev, log_fn);
714 info(udev, "version %s\n", VERSION);
715 udev_selinux_init(udev);
720 option = getopt_long(argc, argv, "dDthV", options, NULL);
733 if (udev_get_log_priority(udev) < LOG_INFO)
734 udev_set_log_priority(udev, LOG_INFO);
737 if (strcmp (optarg, "early") == 0) {
739 } else if (strcmp (optarg, "late") == 0) {
741 } else if (strcmp (optarg, "never") == 0) {
744 fprintf(stderr, "resolve-names must be early, late or never\n");
745 err(udev, "resolve-names must be early, late or never\n");
750 printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] "
751 "[--resolve-names=early|late|never] [--version]\n");
754 printf("%s\n", VERSION);
762 fprintf(stderr, "root privileges required\n");
763 err(udev, "root privileges required\n");
767 /* make sure std{in,out,err} fd's are in a sane state */
768 fd = open("/dev/null", O_RDWR);
770 fprintf(stderr, "cannot open /dev/null\n");
771 err(udev, "cannot open /dev/null\n");
773 if (write(STDOUT_FILENO, 0, 0) < 0)
774 dup2(fd, STDOUT_FILENO);
775 if (write(STDERR_FILENO, 0, 0) < 0)
776 dup2(fd, STDERR_FILENO);
778 /* init control socket, bind() ensures, that only one udevd instance is running */
779 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
780 if (udev_ctrl == NULL) {
781 fprintf(stderr, "error initializing control socket");
782 err(udev, "error initializing udevd socket");
787 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
788 fprintf(stderr, "error binding control socket, seems udevd is already running\n");
789 err(udev, "error binding control socket, seems udevd is already running\n");
794 kernel_monitor = udev_monitor_new_from_netlink(udev);
795 if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) {
796 fprintf(stderr, "error initializing netlink socket\n");
797 err(udev, "error initializing netlink socket\n");
801 udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024);
803 rules = udev_rules_new(udev, resolve_names);
805 err(udev, "error reading rules\n");
808 udev_list_init(&event_list);
809 cleanup_queue_dir(udev);
810 export_initial_seqnum(udev);
818 dbg(udev, "daemonized fork running\n");
821 err(udev, "fork of daemon failed: %m\n");
825 dbg(udev, "child [%u] running, parent exits\n", pid);
831 /* redirect std{out,err} */
832 if (!debug && !debug_trace) {
833 dup2(fd, STDIN_FILENO);
834 dup2(fd, STDOUT_FILENO);
835 dup2(fd, STDERR_FILENO);
837 if (fd > STDERR_FILENO)
840 /* set scheduling priority for the daemon */
841 setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
847 /* OOM_DISABLE == -17 */
848 fd = open("/proc/self/oom_adj", O_RDWR);
850 err(udev, "error disabling OOM: %m\n");
856 fd = open("/dev/kmsg", O_WRONLY);
858 const char *ver_str = "<6>udev: starting version " VERSION "\n";
859 char path[UTIL_PATH_SIZE];
862 write(fd, ver_str, strlen(ver_str));
863 util_strlcpy(path, udev_get_sys_path(udev), sizeof(path));
864 util_strlcat(path, "/class/mem/null", sizeof(path));
865 if (lstat(path, &statbuf) == 0) {
866 if (S_ISDIR(statbuf.st_mode)) {
867 const char *depr_str =
868 "<6>udev: deprecated sysfs layout; update the kernel or "
869 "disable CONFIG_SYSFS_DEPRECATED; some udev features will "
870 "not work correctly\n";
872 write(fd, depr_str, strlen(depr_str));
878 /* set signal handlers */
879 memset(&act, 0x00, sizeof(struct sigaction));
880 act.sa_handler = (void (*)(int)) sig_handler;
881 sigemptyset(&act.sa_mask);
882 act.sa_flags = SA_RESTART;
883 sigaction(SIGINT, &act, NULL);
884 sigaction(SIGTERM, &act, NULL);
885 sigaction(SIGCHLD, &act, NULL);
886 sigaction(SIGHUP, &act, NULL);
888 /* watch rules directory */
889 udev_watch_init(udev);
890 if (inotify_fd >= 0) {
891 if (udev_get_rules_path(udev) != NULL) {
892 inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
893 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
895 char filename[UTIL_PATH_SIZE];
897 inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
898 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
899 inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
900 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
902 /* watch dynamic rules directory */
903 util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
904 util_strlcat(filename, "/.udev/rules.d", sizeof(filename));
905 inotify_add_watch(inotify_fd, filename,
906 IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
909 udev_watch_restore(udev);
912 /* in trace mode run one event after the other */
916 int memsize = mem_size_mb();
918 max_childs = 128 + (memsize / 4);
920 max_childs = UDEVD_MAX_CHILDS;
922 /* possibly overwrite maximum limit of executed events */
923 value = getenv("UDEVD_MAX_CHILDS");
925 max_childs = strtoul(value, NULL, 10);
926 info(udev, "initialize max_childs to %u\n", max_childs);
929 sigset_t blocked_mask, orig_mask;
930 struct pollfd pfd[4];
931 struct pollfd *ctrl_poll, *monitor_poll, *inotify_poll = NULL;
935 sigfillset(&blocked_mask);
936 sigprocmask(SIG_SETMASK, &blocked_mask, &orig_mask);
937 if (signal_received) {
938 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
942 ctrl_poll = &pfd[nfds++];
943 ctrl_poll->fd = udev_ctrl_get_fd(udev_ctrl);
944 ctrl_poll->events = POLLIN;
946 monitor_poll = &pfd[nfds++];
947 monitor_poll->fd = udev_monitor_get_fd(kernel_monitor);
948 monitor_poll->events = POLLIN;
950 if (inotify_fd >= 0) {
951 inotify_poll = &pfd[nfds++];
952 inotify_poll->fd = inotify_fd;
953 inotify_poll->events = POLLIN;
956 fdcount = ppoll(pfd, nfds, NULL, &orig_mask);
957 sigprocmask(SIG_SETMASK, &orig_mask, NULL);
961 err(udev, "error in select: %m\n");
965 /* get control message */
966 if (ctrl_poll->revents & POLLIN)
967 handle_ctrl_msg(udev_ctrl);
969 /* get kernel uevent */
970 if (monitor_poll->revents & POLLIN) {
971 struct udev_device *dev;
973 dev = udev_monitor_receive_device(kernel_monitor);
975 struct udev_event *event;
977 event = udev_event_new(dev);
979 event_queue_insert(event);
981 udev_device_unref(dev);
985 /* rules directory inotify watch */
986 if (inotify_poll && (inotify_poll->revents & POLLIN))
987 handle_inotify(udev);
992 /* rules changed, set by inotify or a HUP signal */
994 struct udev_rules *rules_new;
997 rules_new = udev_rules_new(udev, resolve_names);
998 if (rules_new != NULL) {
999 udev_rules_unref(rules);
1004 if (sigchilds_waiting) {
1005 sigchilds_waiting = 0;
1012 event_queue_manager(udev);
1015 cleanup_queue_dir(udev);
1018 udev_rules_unref(rules);
1019 udev_ctrl_unref(udev_ctrl);
1020 if (inotify_fd >= 0)
1022 udev_monitor_unref(kernel_monitor);
1023 udev_selinux_exit(udev);