2 * Copyright (C) 2004-2011 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/>.
35 #include <sys/prctl.h>
36 #include <sys/socket.h>
38 #include <sys/signalfd.h>
39 #include <sys/epoll.h>
43 #include <sys/ioctl.h>
44 #include <sys/inotify.h>
45 #include <sys/utsname.h>
48 #include "sd-daemon.h"
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)
61 vsnprintf(buf, sizeof(buf), format, args);
62 gettimeofday(&tv, &tz);
63 fprintf(stderr, "%llu.%06u [%u] %s: %s",
64 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
65 (int) getpid(), fn, buf);
67 vsyslog(priority, format, args);
71 static struct udev_rules *rules;
72 static struct udev_queue_export *udev_queue_export;
73 static struct udev_ctrl *udev_ctrl;
74 static struct udev_monitor *monitor;
75 static int worker_watch[2] = { -1, -1 };
76 static int fd_signal = -1;
77 static int fd_ep = -1;
78 static int fd_inotify = -1;
79 static bool stop_exec_queue;
80 static bool reload_config;
82 static int children_max;
83 static int exec_delay;
84 static sigset_t orig_sigmask;
85 static UDEV_LIST(event_list);
86 static UDEV_LIST(worker_list);
87 static bool udev_exit;
88 static volatile sig_atomic_t worker_exit;
97 struct udev_list_node node;
99 struct udev_device *dev;
100 enum event_state state;
102 unsigned long long int delaying_seqnum;
103 unsigned long long int seqnum;
106 const char *devpath_old;
112 static struct event *node_to_event(struct udev_list_node *node)
116 event = (char *)node;
117 event -= offsetof(struct event, node);
118 return (struct event *)event;
121 static void event_queue_cleanup(struct udev *udev, enum event_state type);
131 struct udev_list_node node;
135 struct udev_monitor *monitor;
136 enum worker_state state;
140 /* passed from worker to main process */
141 struct worker_message {
146 static struct worker *node_to_worker(struct udev_list_node *node)
150 worker = (char *)node;
151 worker -= offsetof(struct worker, node);
152 return (struct worker *)worker;
155 static void event_queue_delete(struct event *event, bool export)
157 udev_list_node_remove(&event->node);
160 /* mark as failed, if "add" event returns non-zero */
161 if (event->exitcode != 0 && strcmp(udev_device_get_action(event->dev), "remove") != 0)
162 udev_queue_export_device_failed(udev_queue_export, event->dev);
164 udev_queue_export_device_finished(udev_queue_export, event->dev);
165 info(event->udev, "seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
167 udev_device_unref(event->dev);
171 static void event_sig_handler(int signum)
183 static struct worker *worker_ref(struct worker *worker)
189 static void worker_cleanup(struct worker *worker)
191 udev_list_node_remove(&worker->node);
192 udev_monitor_unref(worker->monitor);
197 static void worker_unref(struct worker *worker)
200 if (worker->refcount > 0)
202 info(worker->udev, "worker [%u] cleaned up\n", worker->pid);
203 worker_cleanup(worker);
206 static void worker_list_cleanup(struct udev *udev)
208 struct udev_list_node *loop, *tmp;
210 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
211 struct worker *worker = node_to_worker(loop);
213 worker_cleanup(worker);
217 static void worker_new(struct event *event)
219 struct udev *udev = event->udev;
220 struct worker *worker;
221 struct udev_monitor *worker_monitor;
223 struct sigaction act;
225 /* listen for new events */
226 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
227 if (worker_monitor == NULL)
229 /* allow the main daemon netlink address to send devices to the worker */
230 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
231 udev_monitor_enable_receiving(worker_monitor);
233 worker = calloc(1, sizeof(struct worker));
234 if (worker == NULL) {
235 udev_monitor_unref(worker_monitor);
238 /* worker + event reference */
239 worker->refcount = 2;
246 struct udev_device *dev;
247 struct pollfd pmon = {
248 .fd = udev_monitor_get_fd(worker_monitor),
252 /* move initial device from queue */
257 worker_list_cleanup(udev);
258 event_queue_cleanup(udev, EVENT_UNDEF);
259 udev_queue_export_unref(udev_queue_export);
260 udev_monitor_unref(monitor);
261 udev_ctrl_unref(udev_ctrl);
264 close(worker_watch[READ_END]);
266 udev_log_init("udevd-work");
268 /* set signal handlers */
269 memset(&act, 0x00, sizeof(act));
270 act.sa_handler = event_sig_handler;
271 sigemptyset (&act.sa_mask);
273 sigaction(SIGTERM, &act, NULL);
274 sigaction(SIGALRM, &act, NULL);
276 /* unblock SIGALRM */
277 sigfillset(&sigmask);
278 sigdelset(&sigmask, SIGALRM);
279 sigprocmask(SIG_SETMASK, &sigmask, NULL);
280 /* SIGTERM is unblocked in ppoll() */
281 sigdelset(&sigmask, SIGTERM);
283 /* request TERM signal if parent exits */
284 prctl(PR_SET_PDEATHSIG, SIGTERM);
287 struct udev_event *udev_event;
288 struct worker_message msg = {};
292 info(udev, "seq %llu running\n", udev_device_get_seqnum(dev));
293 udev_event = udev_event_new(dev);
294 if (udev_event == NULL)
297 /* set timeout to prevent hanging processes */
298 alarm(UDEV_EVENT_TIMEOUT);
301 udev_event->exec_delay = exec_delay;
303 /* apply rules, create node, symlinks */
304 err = udev_event_execute_rules(udev_event, rules);
306 /* rules may change/disable the timeout */
307 if (udev_device_get_event_timeout(dev) >= 0)
308 alarm(udev_device_get_event_timeout(dev));
311 failed = udev_event_execute_run(udev_event, &orig_sigmask);
315 /* apply/restore inotify watch */
316 if (err == 0 && udev_event->inotify_watch) {
317 udev_watch_begin(udev, dev);
318 udev_device_update_db(dev);
321 /* send processed event back to libudev listeners */
322 udev_monitor_send_device(worker_monitor, NULL, dev);
324 /* send udevd the result of the event execution */
327 else if (failed != 0)
328 msg.exitcode = failed;
330 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
332 info(udev, "seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
333 udev_event_unref(udev_event);
334 udev_device_unref(dev);
337 /* wait for more device messages or signal from udevd */
338 while (!worker_exit) {
341 fdcount = ppoll(&pmon, 1, NULL, &sigmask);
345 if (pmon.revents & POLLIN) {
346 dev = udev_monitor_receive_device(worker_monitor);
351 } while (dev != NULL);
354 close(worker_watch[WRITE_END]);
355 udev_rules_unref(rules);
356 udev_monitor_unref(worker_monitor);
362 udev_monitor_unref(worker_monitor);
363 event->state = EVENT_QUEUED;
365 err(udev, "fork of child failed: %m\n");
368 /* close monitor, but keep address around */
369 udev_monitor_disconnect(worker_monitor);
370 worker->monitor = worker_monitor;
372 worker->state = WORKER_RUNNING;
373 worker->event = event;
374 event->state = EVENT_RUNNING;
375 udev_list_node_append(&worker->node, &worker_list);
377 info(udev, "seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
382 static void event_run(struct event *event, bool force)
384 struct udev_list_node *loop;
386 udev_list_node_foreach(loop, &worker_list) {
387 struct worker *worker = node_to_worker(loop);
390 if (worker->state != WORKER_IDLE)
393 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
395 err(event->udev, "worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
396 kill(worker->pid, SIGKILL);
397 worker->state = WORKER_KILLED;
401 worker->event = event;
402 worker->state = WORKER_RUNNING;
403 event->state = EVENT_RUNNING;
407 if (!force && children >= children_max) {
408 if (children_max > 1)
409 info(event->udev, "maximum number (%i) of children reached\n", children);
413 /* start new worker and pass initial device */
417 static int event_queue_insert(struct udev_device *dev)
421 event = calloc(1, sizeof(struct event));
425 event->udev = udev_device_get_udev(dev);
427 event->seqnum = udev_device_get_seqnum(dev);
428 event->devpath = udev_device_get_devpath(dev);
429 event->devpath_len = strlen(event->devpath);
430 event->devpath_old = udev_device_get_devpath_old(dev);
431 event->devnum = udev_device_get_devnum(dev);
432 event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
433 event->ifindex = udev_device_get_ifindex(dev);
435 udev_queue_export_device_queued(udev_queue_export, dev);
436 info(event->udev, "seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
437 udev_device_get_action(dev), udev_device_get_subsystem(dev));
439 event->state = EVENT_QUEUED;
440 udev_list_node_append(&event->node, &event_list);
442 /* run all events with a timeout set immediately */
443 if (udev_device_get_timeout(dev) > 0) {
444 event_run(event, true);
451 static void worker_kill(struct udev *udev, int retain)
453 struct udev_list_node *loop;
456 if (children <= retain)
459 max = children - retain;
461 udev_list_node_foreach(loop, &worker_list) {
462 struct worker *worker = node_to_worker(loop);
467 if (worker->state == WORKER_KILLED)
470 worker->state = WORKER_KILLED;
471 kill(worker->pid, SIGTERM);
475 /* lookup event for identical, parent, child device */
476 static bool is_devpath_busy(struct event *event)
478 struct udev_list_node *loop;
481 /* check if queue contains events we depend on */
482 udev_list_node_foreach(loop, &event_list) {
483 struct event *loop_event = node_to_event(loop);
485 /* we already found a later event, earlier can not block us, no need to check again */
486 if (loop_event->seqnum < event->delaying_seqnum)
489 /* event we checked earlier still exists, no need to check again */
490 if (loop_event->seqnum == event->delaying_seqnum)
493 /* found ourself, no later event can block us */
494 if (loop_event->seqnum >= event->seqnum)
497 /* check major/minor */
498 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
501 /* check network device ifindex */
502 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
505 /* check our old name */
506 if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
507 event->delaying_seqnum = loop_event->seqnum;
511 /* compare devpath */
512 common = MIN(loop_event->devpath_len, event->devpath_len);
514 /* one devpath is contained in the other? */
515 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
518 /* identical device event found */
519 if (loop_event->devpath_len == event->devpath_len) {
520 /* devices names might have changed/swapped in the meantime */
521 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
523 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
525 event->delaying_seqnum = loop_event->seqnum;
529 /* parent device event found */
530 if (event->devpath[common] == '/') {
531 event->delaying_seqnum = loop_event->seqnum;
535 /* child device event found */
536 if (loop_event->devpath[common] == '/') {
537 event->delaying_seqnum = loop_event->seqnum;
541 /* no matching device */
548 static void event_queue_start(struct udev *udev)
550 struct udev_list_node *loop;
552 udev_list_node_foreach(loop, &event_list) {
553 struct event *event = node_to_event(loop);
555 if (event->state != EVENT_QUEUED)
558 /* do not start event if parent or child event is still running */
559 if (is_devpath_busy(event)) {
560 dbg(udev, "delay seq %llu (%s)\n", event->seqnum, event->devpath);
564 event_run(event, false);
568 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
570 struct udev_list_node *loop, *tmp;
572 udev_list_node_foreach_safe(loop, tmp, &event_list) {
573 struct event *event = node_to_event(loop);
575 if (match_type != EVENT_UNDEF && match_type != event->state)
578 event_queue_delete(event, false);
582 static void worker_returned(int fd_worker)
585 struct worker_message msg;
587 struct udev_list_node *loop;
589 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
590 if (size != sizeof(struct worker_message))
593 /* lookup worker who sent the signal */
594 udev_list_node_foreach(loop, &worker_list) {
595 struct worker *worker = node_to_worker(loop);
597 if (worker->pid != msg.pid)
600 /* worker returned */
601 worker->event->exitcode = msg.exitcode;
602 event_queue_delete(worker->event, true);
603 worker->event = NULL;
604 if (worker->state != WORKER_KILLED)
605 worker->state = WORKER_IDLE;
606 worker_unref(worker);
612 /* receive the udevd message from userspace */
613 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
615 struct udev *udev = udev_ctrl_get_udev(uctrl);
616 struct udev_ctrl_connection *ctrl_conn;
617 struct udev_ctrl_msg *ctrl_msg = NULL;
621 ctrl_conn = udev_ctrl_get_connection(uctrl);
622 if (ctrl_conn == NULL)
625 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
626 if (ctrl_msg == NULL)
629 i = udev_ctrl_get_set_log_level(ctrl_msg);
631 info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
632 udev_set_log_priority(udev, i);
633 worker_kill(udev, 0);
636 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
637 info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
638 stop_exec_queue = true;
641 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
642 info(udev, "udevd message (START_EXEC_QUEUE) received\n");
643 stop_exec_queue = false;
646 if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
647 info(udev, "udevd message (RELOAD_RULES) received\n");
648 reload_config = true;
651 str = udev_ctrl_get_set_env(ctrl_msg);
659 val = strchr(key, '=');
663 if (val[0] == '\0') {
664 info(udev, "udevd message (ENV) received, unset '%s'\n", key);
665 udev_add_property(udev, key, NULL);
667 info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
668 udev_add_property(udev, key, val);
671 err(udev, "wrong key format '%s'\n", key);
675 worker_kill(udev, 0);
678 i = udev_ctrl_get_set_children_max(ctrl_msg);
680 info(udev, "udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
684 if (udev_ctrl_get_ping(ctrl_msg) > 0)
685 info(udev, "udevd message (SYNC) received\n");
687 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
688 info(udev, "udevd message (EXIT) received\n");
690 /* keep reference to block the client until we exit */
691 udev_ctrl_connection_ref(ctrl_conn);
694 udev_ctrl_msg_unref(ctrl_msg);
695 return udev_ctrl_connection_unref(ctrl_conn);
698 /* read inotify messages */
699 static int handle_inotify(struct udev *udev)
703 struct inotify_event *ev;
705 if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
708 buf = malloc(nbytes);
710 err(udev, "error getting buffer for inotify\n");
714 nbytes = read(fd_inotify, buf, nbytes);
716 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
717 struct udev_device *dev;
719 ev = (struct inotify_event *)(buf + pos);
723 info(udev, "inotify event: %x for %s\n", ev->mask, ev->name);
724 s = strstr(ev->name, ".rules");
727 if (strlen(s) != strlen(".rules"))
729 reload_config = true;
733 dev = udev_watch_lookup(udev, ev->wd);
735 info(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
736 if (ev->mask & IN_CLOSE_WRITE) {
737 char filename[UTIL_PATH_SIZE];
740 info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
741 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
742 fd = open(filename, O_WRONLY);
744 if (write(fd, "change", 6) < 0)
745 info(udev, "error writing uevent: %m\n");
749 if (ev->mask & IN_IGNORED)
750 udev_watch_end(udev, dev);
752 udev_device_unref(dev);
761 static void handle_signal(struct udev *udev, int signo)
772 struct udev_list_node *loop, *tmp;
774 pid = waitpid(-1, &status, WNOHANG);
778 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
779 struct worker *worker = node_to_worker(loop);
781 if (worker->pid != pid)
784 info(udev, "worker [%u] exit\n", pid);
785 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
786 err(udev, "worker [%u] unexpectedly returned with status 0x%04x\n", pid, status);
787 if (worker->event != NULL) {
788 err(udev, "worker [%u] failed while handling '%s'\n", pid, worker->event->devpath);
789 worker->event->exitcode = -32;
790 event_queue_delete(worker->event, true);
791 /* drop reference from running event */
792 worker_unref(worker);
795 worker_unref(worker);
801 reload_config = true;
806 static void static_dev_create_from_modules(struct udev *udev)
808 struct utsname kernel;
809 char modules[UTIL_PATH_SIZE];
814 util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL);
815 f = fopen(modules, "r");
819 while (fgets(buf, sizeof(buf), f) != NULL) {
827 char filename[UTIL_PATH_SIZE];
833 s = strchr(modname, ' ');
839 s = strchr(devname, ' ');
845 s = strchr(devno, ' ');
847 s = strchr(devno, '\n');
850 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
854 mode = 0600 | S_IFCHR;
855 else if (type == 'b')
856 mode = 0600 | S_IFBLK;
860 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/", devname, NULL);
861 util_create_path_selinux(udev, filename);
862 udev_selinux_setfscreatecon(udev, filename, mode);
863 info(udev, "mknod '%s' %c%u:%u\n", filename, type, maj, min);
864 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
865 utimensat(AT_FDCWD, filename, NULL, 0);
866 udev_selinux_resetfscreatecon(udev);
872 static int copy_dev_dir(struct udev *udev, DIR *dir_from, DIR *dir_to, int maxdepth)
876 for (dent = readdir(dir_from); dent != NULL; dent = readdir(dir_from)) {
879 if (dent->d_name[0] == '.')
881 if (fstatat(dirfd(dir_from), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
884 if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
885 udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, stats.st_mode & 0777);
886 if (mknodat(dirfd(dir_to), dent->d_name, stats.st_mode, stats.st_rdev) == 0) {
887 fchmodat(dirfd(dir_to), dent->d_name, stats.st_mode & 0777, 0);
888 fchownat(dirfd(dir_to), dent->d_name, stats.st_uid, stats.st_gid, 0);
890 utimensat(dirfd(dir_to), dent->d_name, NULL, 0);
892 udev_selinux_resetfscreatecon(udev);
893 } else if (S_ISLNK(stats.st_mode)) {
894 char target[UTIL_PATH_SIZE];
897 len = readlinkat(dirfd(dir_from), dent->d_name, target, sizeof(target));
898 if (len <= 0 || len == (ssize_t)sizeof(target))
901 udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFLNK);
902 if (symlinkat(target, dirfd(dir_to), dent->d_name) < 0 && errno == EEXIST)
903 utimensat(dirfd(dir_to), dent->d_name, NULL, AT_SYMLINK_NOFOLLOW);
904 udev_selinux_resetfscreatecon(udev);
905 } else if (S_ISDIR(stats.st_mode)) {
906 DIR *dir2_from, *dir2_to;
911 udev_selinux_setfscreateconat(udev, dirfd(dir_to), dent->d_name, S_IFDIR|0755);
912 mkdirat(dirfd(dir_to), dent->d_name, 0755);
913 udev_selinux_resetfscreatecon(udev);
915 dir2_to = fdopendir(openat(dirfd(dir_to), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
919 dir2_from = fdopendir(openat(dirfd(dir_from), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
920 if (dir2_from == NULL) {
925 copy_dev_dir(udev, dir2_from, dir2_to, maxdepth-1);
935 static void static_dev_create_links(struct udev *udev, DIR *dir)
941 static const struct stdlinks stdlinks[] = {
942 { "core", "/proc/kcore" },
943 { "fd", "/proc/self/fd" },
944 { "stdin", "/proc/self/fd/0" },
945 { "stdout", "/proc/self/fd/1" },
946 { "stderr", "/proc/self/fd/2" },
950 for (i = 0; i < ARRAY_SIZE(stdlinks); i++) {
953 if (stat(stdlinks[i].target, &sb) == 0) {
954 udev_selinux_setfscreateconat(udev, dirfd(dir), stdlinks[i].link, S_IFLNK);
955 if (symlinkat(stdlinks[i].target, dirfd(dir), stdlinks[i].link) < 0 && errno == EEXIST)
956 utimensat(dirfd(dir), stdlinks[i].link, NULL, AT_SYMLINK_NOFOLLOW);
957 udev_selinux_resetfscreatecon(udev);
962 static void static_dev_create_from_devices(struct udev *udev, DIR *dir)
966 dir_from = opendir(LIBEXECDIR "/devices");
967 if (dir_from == NULL)
969 copy_dev_dir(udev, dir_from, dir, 8);
973 static void static_dev_create(struct udev *udev)
977 dir = opendir(udev_get_dev_path(udev));
981 static_dev_create_links(udev, dir);
982 static_dev_create_from_devices(udev, dir);
987 static int mem_size_mb(void)
991 long int memsize = -1;
993 f = fopen("/proc/meminfo", "r");
997 while (fgets(buf, sizeof(buf), f) != NULL) {
1000 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
1001 memsize = value / 1024;
1010 static int convert_db(struct udev *udev)
1012 char filename[UTIL_PATH_SIZE];
1014 struct udev_enumerate *udev_enumerate;
1015 struct udev_list_entry *list_entry;
1017 /* current database */
1018 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/data", NULL);
1019 if (access(filename, F_OK) >= 0)
1022 /* make sure we do not get here again */
1023 util_create_path(udev, filename);
1024 mkdir(filename, 0755);
1027 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev/db", NULL);
1028 if (access(filename, F_OK) < 0)
1031 f = fopen("/dev/kmsg", "w");
1033 fprintf(f, "<30>udev[%u]: converting old udev database\n", getpid());
1037 udev_enumerate = udev_enumerate_new(udev);
1038 if (udev_enumerate == NULL)
1040 udev_enumerate_scan_devices(udev_enumerate);
1041 udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
1042 struct udev_device *device;
1044 device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
1048 /* try to find the old database for devices without a current one */
1049 if (udev_device_read_db(device, NULL) < 0) {
1053 char devpath[UTIL_PATH_SIZE];
1054 char from[UTIL_PATH_SIZE];
1058 /* find database in old location */
1059 id = udev_device_get_id_filename(device);
1060 util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", id, NULL);
1061 if (lstat(from, &stats) == 0) {
1063 udev_device_read_db(device, from);
1069 /* find old database with $subsys:$sysname name */
1070 util_strscpyl(from, sizeof(from), udev_get_dev_path(udev),
1071 "/.udev/db/", udev_device_get_subsystem(device), ":",
1072 udev_device_get_sysname(device), NULL);
1073 if (lstat(from, &stats) == 0) {
1075 udev_device_read_db(device, from);
1081 /* find old database with the encoded devpath name */
1082 util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
1083 util_strscpyl(from, sizeof(from), udev_get_dev_path(udev), "/.udev/db/", devpath, NULL);
1084 if (lstat(from, &stats) == 0) {
1086 udev_device_read_db(device, from);
1092 /* write out new database */
1094 udev_device_update_db(device);
1096 udev_device_unref(device);
1098 udev_enumerate_unref(udev_enumerate);
1102 int main(int argc, char *argv[])
1107 int daemonize = false;
1108 int resolve_names = 1;
1109 static const struct option options[] = {
1110 { "daemon", no_argument, NULL, 'd' },
1111 { "debug", no_argument, NULL, 'D' },
1112 { "children-max", required_argument, NULL, 'c' },
1113 { "exec-delay", required_argument, NULL, 'e' },
1114 { "resolve-names", required_argument, NULL, 'N' },
1115 { "help", no_argument, NULL, 'h' },
1116 { "version", no_argument, NULL, 'V' },
1120 int fd_netlink = -1;
1122 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1123 struct udev_ctrl_connection *ctrl_conn = NULL;
1130 udev_log_init("udevd");
1131 udev_set_log_fn(udev, log_fn);
1132 info(udev, "version %s\n", VERSION);
1133 udev_selinux_init(udev);
1135 /* make sure, that our runtime dir exists and is writable */
1136 if (utimensat(AT_FDCWD, udev_get_run_config_path(udev), NULL, 0) < 0) {
1137 /* try to create our own subdirectory, do not create parent directories */
1138 mkdir(udev_get_run_config_path(udev), 0755);
1140 if (utimensat(AT_FDCWD, udev_get_run_config_path(udev), NULL, 0) >= 0) {
1141 /* directory seems writable now */
1142 udev_set_run_path(udev, udev_get_run_config_path(udev));
1144 /* fall back to /dev/.udev */
1145 char filename[UTIL_PATH_SIZE];
1147 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev), "/.udev", NULL);
1148 if (udev_set_run_path(udev, filename) == NULL)
1150 mkdir(udev_get_run_path(udev), 0755);
1151 err(udev, "error: runtime directory '%s' not writable, for now falling back to '%s'",
1152 udev_get_run_config_path(udev), udev_get_run_path(udev));
1155 /* relabel runtime dir only if it resides below /dev */
1156 if (strncmp(udev_get_run_path(udev), udev_get_dev_path(udev), strlen(udev_get_dev_path(udev))) == 0)
1157 udev_selinux_lsetfilecon(udev, udev_get_run_path(udev), 0755);
1158 info(udev, "runtime dir '%s'\n", udev_get_run_path(udev));
1163 option = getopt_long(argc, argv, "c:deDtN:hV", options, NULL);
1172 children_max = strtoul(optarg, NULL, 0);
1175 exec_delay = strtoul(optarg, NULL, 0);
1179 if (udev_get_log_priority(udev) < LOG_INFO)
1180 udev_set_log_priority(udev, LOG_INFO);
1183 if (strcmp (optarg, "early") == 0) {
1185 } else if (strcmp (optarg, "late") == 0) {
1187 } else if (strcmp (optarg, "never") == 0) {
1190 fprintf(stderr, "resolve-names must be early, late or never\n");
1191 err(udev, "resolve-names must be early, late or never\n");
1196 printf("Usage: udevd OPTIONS\n"
1199 " --children-max=<maximum number of workers>\n"
1200 " --exec-delay=<seconds to wait before executing RUN=>\n"
1201 " --resolve-names=early|late|never\n"
1207 printf("%s\n", VERSION);
1215 * read the kernel commandline, in case we need to get into debug mode
1216 * udev.log-priority=<level> syslog priority
1217 * udev.children-max=<number of workers> events are fully serialized if set to 1
1220 f = fopen("/proc/cmdline", "r");
1224 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
1227 pos = strstr(cmdline, "udev.log-priority=");
1229 pos += strlen("udev.log-priority=");
1230 udev_set_log_priority(udev, util_log_priority(pos));
1233 pos = strstr(cmdline, "udev.children-max=");
1235 pos += strlen("udev.children-max=");
1236 children_max = strtoul(pos, NULL, 0);
1239 pos = strstr(cmdline, "udev.exec-delay=");
1241 pos += strlen("udev.exec-delay=");
1242 exec_delay = strtoul(pos, NULL, 0);
1248 if (getuid() != 0) {
1249 fprintf(stderr, "root privileges required\n");
1250 err(udev, "root privileges required\n");
1254 /* set umask before creating any file/directory */
1258 /* create standard links, copy static nodes, create nodes from modules */
1259 static_dev_create(udev);
1260 static_dev_create_from_modules(udev);
1262 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1266 fd = open("/dev/null", O_RDWR);
1268 if (write(STDOUT_FILENO, 0, 0) < 0)
1269 dup2(fd, STDOUT_FILENO);
1270 if (write(STDERR_FILENO, 0, 0) < 0)
1271 dup2(fd, STDERR_FILENO);
1272 if (fd > STDERR_FILENO)
1275 fprintf(stderr, "cannot open /dev/null\n");
1276 err(udev, "cannot open /dev/null\n");
1280 /* udevadm control socket */
1281 if (sd_listen_fds(true) == 1 && sd_is_socket(SD_LISTEN_FDS_START, AF_LOCAL, SOCK_SEQPACKET, -1))
1282 udev_ctrl = udev_ctrl_new_from_fd(udev, SD_LISTEN_FDS_START);
1284 udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
1285 if (udev_ctrl == NULL) {
1286 fprintf(stderr, "error initializing udev control socket");
1287 err(udev, "error initializing udev control socket");
1291 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1292 fprintf(stderr, "error binding udev control socket\n");
1293 err(udev, "error binding udev control socket\n");
1297 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1299 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1300 if (monitor == NULL || udev_monitor_enable_receiving(monitor) < 0) {
1301 fprintf(stderr, "error initializing netlink socket\n");
1302 err(udev, "error initializing netlink socket\n");
1306 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1307 fd_netlink = udev_monitor_get_fd(monitor);
1318 err(udev, "fork of daemon failed: %m\n");
1328 fd = open("/proc/self/oom_score_adj", O_RDWR);
1330 /* Fallback to old interface */
1331 fd = open("/proc/self/oom_adj", O_RDWR);
1333 err(udev, "error disabling OOM: %m\n");
1335 /* OOM_DISABLE == -17 */
1336 write(fd, "-17", 3);
1340 write(fd, "-1000", 5);
1344 sd_notify(1, "READY=1");
1347 f = fopen("/dev/kmsg", "w");
1349 fprintf(f, "<30>udev[%u]: starting version " VERSION "\n", getpid());
1356 fd = open("/dev/null", O_RDWR);
1358 dup2(fd, STDIN_FILENO);
1359 dup2(fd, STDOUT_FILENO);
1360 dup2(fd, STDERR_FILENO);
1365 fd_inotify = udev_watch_init(udev);
1366 if (fd_inotify < 0) {
1367 fprintf(stderr, "error initializing inotify\n");
1368 err(udev, "error initializing inotify\n");
1373 if (udev_get_rules_path(udev) != NULL) {
1374 inotify_add_watch(fd_inotify, udev_get_rules_path(udev),
1375 IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1377 char filename[UTIL_PATH_SIZE];
1378 struct stat statbuf;
1380 inotify_add_watch(fd_inotify, LIBEXECDIR "/rules.d",
1381 IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1382 inotify_add_watch(fd_inotify, SYSCONFDIR "/udev/rules.d",
1383 IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1385 /* watch dynamic rules directory */
1386 util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
1387 if (stat(filename, &statbuf) != 0) {
1388 util_create_path(udev, filename);
1389 mkdir(filename, 0755);
1391 inotify_add_watch(fd_inotify, filename,
1392 IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
1394 udev_watch_restore(udev);
1396 /* block and listen to all signals on signalfd */
1398 sigprocmask(SIG_SETMASK, &mask, &orig_sigmask);
1399 fd_signal = signalfd(-1, &mask, SFD_CLOEXEC);
1400 if (fd_signal < 0) {
1401 fprintf(stderr, "error getting signalfd\n");
1402 err(udev, "error getting signalfd\n");
1407 /* unnamed socket from workers to the main daemon */
1408 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1409 fprintf(stderr, "error getting socketpair\n");
1410 err(udev, "error getting socketpair\n");
1414 fd_worker = worker_watch[READ_END];
1416 rules = udev_rules_new(udev, resolve_names);
1417 if (rules == NULL) {
1418 err(udev, "error reading rules\n");
1422 udev_queue_export = udev_queue_export_new(udev);
1423 if (udev_queue_export == NULL) {
1424 err(udev, "error creating queue file\n");
1428 memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1429 ep_ctrl.events = EPOLLIN;
1430 ep_ctrl.data.fd = fd_ctrl;
1431 memset(&ep_inotify, 0, sizeof(struct epoll_event));
1432 ep_inotify.events = EPOLLIN;
1433 ep_inotify.data.fd = fd_inotify;
1434 memset(&ep_signal, 0, sizeof(struct epoll_event));
1435 ep_signal.events = EPOLLIN;
1436 ep_signal.data.fd = fd_signal;
1437 memset(&ep_netlink, 0, sizeof(struct epoll_event));
1438 ep_netlink.events = EPOLLIN;
1439 ep_netlink.data.fd = fd_netlink;
1440 memset(&ep_worker, 0, sizeof(struct epoll_event));
1441 ep_worker.events = EPOLLIN;
1442 ep_worker.data.fd = fd_worker;
1443 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1445 err(udev, "error creating epoll fd: %m\n");
1448 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1449 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1450 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1451 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1452 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1453 err(udev, "fail to add fds to epoll: %m\n");
1457 /* if needed, convert old database from earlier udev version */
1460 if (children_max <= 0) {
1461 int memsize = mem_size_mb();
1463 /* set value depending on the amount of RAM */
1465 children_max = 128 + (memsize / 8);
1469 info(udev, "set children_max to %u\n", children_max);
1471 udev_rules_apply_static_dev_perms(rules);
1473 udev_list_init(&event_list);
1474 udev_list_init(&worker_list);
1477 struct epoll_event ev[8];
1480 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1484 /* close sources of new events and discard buffered events */
1486 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1489 if (monitor != NULL) {
1490 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1491 udev_monitor_unref(monitor);
1494 if (fd_inotify >= 0) {
1495 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1500 /* discard queued events and kill workers */
1501 event_queue_cleanup(udev, EVENT_QUEUED);
1502 worker_kill(udev, 0);
1504 /* exit after all has cleaned up */
1505 if (udev_list_is_empty(&event_list) && udev_list_is_empty(&worker_list))
1508 /* timeout at exit for workers to finish */
1509 timeout = 60 * 1000;
1510 } else if (udev_list_is_empty(&event_list) && children > 2) {
1511 /* set timeout to kill idle workers */
1516 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
1522 info(udev, "timeout, giving up waiting for workers to finish\n");
1526 /* timeout - kill idle workers */
1527 worker_kill(udev, 2);
1530 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1531 for (i = 0; i < fdcount; i++) {
1532 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1534 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1536 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1538 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1540 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1544 /* event has finished */
1546 worker_returned(fd_worker);
1549 struct udev_device *dev;
1551 dev = udev_monitor_receive_device(monitor);
1553 if (event_queue_insert(dev) < 0)
1554 udev_device_unref(dev);
1557 /* start new events */
1558 if (!udev_list_is_empty(&event_list) && !udev_exit && !stop_exec_queue)
1559 event_queue_start(udev);
1562 struct signalfd_siginfo fdsi;
1565 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1566 if (size == sizeof(struct signalfd_siginfo))
1567 handle_signal(udev, fdsi.ssi_signo);
1570 /* we are shutting down, the events below are not handled anymore */
1574 /* device node and rules directory inotify watch */
1576 handle_inotify(udev);
1579 * This needs to be after the inotify handling, to make sure,
1580 * that the ping is send back after the possibly generated
1581 * "change" events by the inotify device node watch.
1583 * A single time we may receive a client connection which we need to
1584 * keep open to block the client. It will be closed right before we
1588 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1590 /* rules changed, set by inotify or a HUP signal */
1591 if (reload_config) {
1592 struct udev_rules *rules_new;
1594 worker_kill(udev, 0);
1595 rules_new = udev_rules_new(udev, resolve_names);
1596 if (rules_new != NULL) {
1597 udev_rules_unref(rules);
1604 udev_queue_export_cleanup(udev_queue_export);
1609 worker_list_cleanup(udev);
1610 event_queue_cleanup(udev, EVENT_UNDEF);
1611 udev_rules_unref(rules);
1614 if (worker_watch[READ_END] >= 0)
1615 close(worker_watch[READ_END]);
1616 if (worker_watch[WRITE_END] >= 0)
1617 close(worker_watch[WRITE_END]);
1618 udev_monitor_unref(monitor);
1619 udev_queue_export_unref(udev_queue_export);
1620 udev_ctrl_connection_unref(ctrl_conn);
1621 udev_ctrl_unref(udev_ctrl);
1622 udev_selinux_exit(udev);