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[thirdparty/systemd.git] / src / udev / udevd.c
1 /*
2 * Copyright (C) 2004-2012 Kay Sievers <kay@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>
6 *
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.
11 *
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.
16 *
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/>.
19 */
20
21 #include <stddef.h>
22 #include <signal.h>
23 #include <unistd.h>
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdbool.h>
28 #include <string.h>
29 #include <ctype.h>
30 #include <fcntl.h>
31 #include <time.h>
32 #include <getopt.h>
33 #include <dirent.h>
34 #include <sys/time.h>
35 #include <sys/prctl.h>
36 #include <sys/socket.h>
37 #include <sys/un.h>
38 #include <sys/signalfd.h>
39 #include <sys/epoll.h>
40 #include <sys/poll.h>
41 #include <sys/wait.h>
42 #include <sys/stat.h>
43 #include <sys/ioctl.h>
44 #include <sys/inotify.h>
45 #include <sys/utsname.h>
46
47 #include "udev.h"
48 #include "sd-daemon.h"
49 #include "cgroup-util.h"
50 #include "dev-setup.h"
51 #include "fileio.h"
52
53 static bool debug;
54
55 void udev_main_log(struct udev *udev, int priority,
56 const char *file, int line, const char *fn,
57 const char *format, va_list args)
58 {
59 log_metav(priority, file, line, fn, format, args);
60 }
61
62 static struct udev_rules *rules;
63 static struct udev_queue_export *udev_queue_export;
64 static struct udev_ctrl *udev_ctrl;
65 static struct udev_monitor *monitor;
66 static int worker_watch[2] = { -1, -1 };
67 static int fd_signal = -1;
68 static int fd_ep = -1;
69 static int fd_inotify = -1;
70 static bool stop_exec_queue;
71 static bool reload;
72 static int children;
73 static int children_max;
74 static int exec_delay;
75 static sigset_t sigmask_orig;
76 static UDEV_LIST(event_list);
77 static UDEV_LIST(worker_list);
78 char *udev_cgroup;
79 static bool udev_exit;
80
81 enum event_state {
82 EVENT_UNDEF,
83 EVENT_QUEUED,
84 EVENT_RUNNING,
85 };
86
87 struct event {
88 struct udev_list_node node;
89 struct udev *udev;
90 struct udev_device *dev;
91 enum event_state state;
92 int exitcode;
93 unsigned long long int delaying_seqnum;
94 unsigned long long int seqnum;
95 const char *devpath;
96 size_t devpath_len;
97 const char *devpath_old;
98 dev_t devnum;
99 int ifindex;
100 bool is_block;
101 #ifdef HAVE_FIRMWARE
102 bool nodelay;
103 #endif
104 };
105
106 static inline struct event *node_to_event(struct udev_list_node *node)
107 {
108 return container_of(node, struct event, node);
109 }
110
111 static void event_queue_cleanup(struct udev *udev, enum event_state type);
112
113 enum worker_state {
114 WORKER_UNDEF,
115 WORKER_RUNNING,
116 WORKER_IDLE,
117 WORKER_KILLED,
118 };
119
120 struct worker {
121 struct udev_list_node node;
122 struct udev *udev;
123 int refcount;
124 pid_t pid;
125 struct udev_monitor *monitor;
126 enum worker_state state;
127 struct event *event;
128 usec_t event_start_usec;
129 };
130
131 /* passed from worker to main process */
132 struct worker_message {
133 pid_t pid;
134 int exitcode;
135 };
136
137 static inline struct worker *node_to_worker(struct udev_list_node *node)
138 {
139 return container_of(node, struct worker, node);
140 }
141
142 static void event_queue_delete(struct event *event, bool export)
143 {
144 udev_list_node_remove(&event->node);
145
146 if (export) {
147 udev_queue_export_device_finished(udev_queue_export, event->dev);
148 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
149 }
150 udev_device_unref(event->dev);
151 free(event);
152 }
153
154 static struct worker *worker_ref(struct worker *worker)
155 {
156 worker->refcount++;
157 return worker;
158 }
159
160 static void worker_cleanup(struct worker *worker)
161 {
162 udev_list_node_remove(&worker->node);
163 udev_monitor_unref(worker->monitor);
164 children--;
165 free(worker);
166 }
167
168 static void worker_unref(struct worker *worker)
169 {
170 worker->refcount--;
171 if (worker->refcount > 0)
172 return;
173 log_debug("worker [%u] cleaned up\n", worker->pid);
174 worker_cleanup(worker);
175 }
176
177 static void worker_list_cleanup(struct udev *udev)
178 {
179 struct udev_list_node *loop, *tmp;
180
181 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
182 struct worker *worker = node_to_worker(loop);
183
184 worker_cleanup(worker);
185 }
186 }
187
188 static void worker_new(struct event *event)
189 {
190 struct udev *udev = event->udev;
191 struct worker *worker;
192 struct udev_monitor *worker_monitor;
193 pid_t pid;
194
195 /* listen for new events */
196 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
197 if (worker_monitor == NULL)
198 return;
199 /* allow the main daemon netlink address to send devices to the worker */
200 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
201 udev_monitor_enable_receiving(worker_monitor);
202
203 worker = calloc(1, sizeof(struct worker));
204 if (worker == NULL) {
205 udev_monitor_unref(worker_monitor);
206 return;
207 }
208 /* worker + event reference */
209 worker->refcount = 2;
210 worker->udev = udev;
211
212 pid = fork();
213 switch (pid) {
214 case 0: {
215 struct udev_device *dev = NULL;
216 int fd_monitor;
217 struct epoll_event ep_signal, ep_monitor;
218 sigset_t mask;
219 int rc = EXIT_SUCCESS;
220
221 /* take initial device from queue */
222 dev = event->dev;
223 event->dev = NULL;
224
225 free(worker);
226 worker_list_cleanup(udev);
227 event_queue_cleanup(udev, EVENT_UNDEF);
228 udev_queue_export_unref(udev_queue_export);
229 udev_monitor_unref(monitor);
230 udev_ctrl_unref(udev_ctrl);
231 close(fd_signal);
232 close(fd_ep);
233 close(worker_watch[READ_END]);
234
235 sigfillset(&mask);
236 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
237 if (fd_signal < 0) {
238 log_error("error creating signalfd %m\n");
239 rc = 2;
240 goto out;
241 }
242
243 fd_ep = epoll_create1(EPOLL_CLOEXEC);
244 if (fd_ep < 0) {
245 log_error("error creating epoll fd: %m\n");
246 rc = 3;
247 goto out;
248 }
249
250 memset(&ep_signal, 0, sizeof(struct epoll_event));
251 ep_signal.events = EPOLLIN;
252 ep_signal.data.fd = fd_signal;
253
254 fd_monitor = udev_monitor_get_fd(worker_monitor);
255 memset(&ep_monitor, 0, sizeof(struct epoll_event));
256 ep_monitor.events = EPOLLIN;
257 ep_monitor.data.fd = fd_monitor;
258
259 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
260 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
261 log_error("fail to add fds to epoll: %m\n");
262 rc = 4;
263 goto out;
264 }
265
266 /* request TERM signal if parent exits */
267 prctl(PR_SET_PDEATHSIG, SIGTERM);
268
269 /* reset OOM score, we only protect the main daemon */
270 write_string_file("/proc/self/oom_score_adj", "0");
271
272 for (;;) {
273 struct udev_event *udev_event;
274 struct worker_message msg;
275 int err;
276
277 log_debug("seq %llu running\n", udev_device_get_seqnum(dev));
278 udev_event = udev_event_new(dev);
279 if (udev_event == NULL) {
280 rc = 5;
281 goto out;
282 }
283
284 /* needed for SIGCHLD/SIGTERM in spawn() */
285 udev_event->fd_signal = fd_signal;
286
287 if (exec_delay > 0)
288 udev_event->exec_delay = exec_delay;
289
290 /* apply rules, create node, symlinks */
291 err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
292
293 if (err == 0)
294 udev_event_execute_run(udev_event, &sigmask_orig);
295
296 /* apply/restore inotify watch */
297 if (err == 0 && udev_event->inotify_watch) {
298 udev_watch_begin(udev, dev);
299 udev_device_update_db(dev);
300 }
301
302 /* send processed event back to libudev listeners */
303 udev_monitor_send_device(worker_monitor, NULL, dev);
304
305 /* send udevd the result of the event execution */
306 memset(&msg, 0, sizeof(struct worker_message));
307 if (err != 0)
308 msg.exitcode = err;
309 msg.pid = getpid();
310 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
311
312 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
313
314 udev_device_unref(dev);
315 dev = NULL;
316
317 if (udev_event->sigterm) {
318 udev_event_unref(udev_event);
319 goto out;
320 }
321
322 udev_event_unref(udev_event);
323
324 /* wait for more device messages from main udevd, or term signal */
325 while (dev == NULL) {
326 struct epoll_event ev[4];
327 int fdcount;
328 int i;
329
330 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
331 if (fdcount < 0) {
332 if (errno == EINTR)
333 continue;
334 log_error("failed to poll: %m\n");
335 goto out;
336 }
337
338 for (i = 0; i < fdcount; i++) {
339 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
340 dev = udev_monitor_receive_device(worker_monitor);
341 break;
342 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
343 struct signalfd_siginfo fdsi;
344 ssize_t size;
345
346 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
347 if (size != sizeof(struct signalfd_siginfo))
348 continue;
349 switch (fdsi.ssi_signo) {
350 case SIGTERM:
351 goto out;
352 }
353 }
354 }
355 }
356 }
357 out:
358 udev_device_unref(dev);
359 if (fd_signal >= 0)
360 close(fd_signal);
361 if (fd_ep >= 0)
362 close(fd_ep);
363 close(fd_inotify);
364 close(worker_watch[WRITE_END]);
365 udev_rules_unref(rules);
366 udev_builtin_exit(udev);
367 udev_monitor_unref(worker_monitor);
368 udev_unref(udev);
369 log_close();
370 exit(rc);
371 }
372 case -1:
373 udev_monitor_unref(worker_monitor);
374 event->state = EVENT_QUEUED;
375 free(worker);
376 log_error("fork of child failed: %m\n");
377 break;
378 default:
379 /* close monitor, but keep address around */
380 udev_monitor_disconnect(worker_monitor);
381 worker->monitor = worker_monitor;
382 worker->pid = pid;
383 worker->state = WORKER_RUNNING;
384 worker->event_start_usec = now(CLOCK_MONOTONIC);
385 worker->event = event;
386 event->state = EVENT_RUNNING;
387 udev_list_node_append(&worker->node, &worker_list);
388 children++;
389 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
390 break;
391 }
392 }
393
394 static void event_run(struct event *event)
395 {
396 struct udev_list_node *loop;
397
398 udev_list_node_foreach(loop, &worker_list) {
399 struct worker *worker = node_to_worker(loop);
400 ssize_t count;
401
402 if (worker->state != WORKER_IDLE)
403 continue;
404
405 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
406 if (count < 0) {
407 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
408 kill(worker->pid, SIGKILL);
409 worker->state = WORKER_KILLED;
410 continue;
411 }
412 worker_ref(worker);
413 worker->event = event;
414 worker->state = WORKER_RUNNING;
415 worker->event_start_usec = now(CLOCK_MONOTONIC);
416 event->state = EVENT_RUNNING;
417 return;
418 }
419
420 if (children >= children_max) {
421 if (children_max > 1)
422 log_debug("maximum number (%i) of children reached\n", children);
423 return;
424 }
425
426 /* start new worker and pass initial device */
427 worker_new(event);
428 }
429
430 static int event_queue_insert(struct udev_device *dev)
431 {
432 struct event *event;
433
434 event = calloc(1, sizeof(struct event));
435 if (event == NULL)
436 return -1;
437
438 event->udev = udev_device_get_udev(dev);
439 event->dev = dev;
440 event->seqnum = udev_device_get_seqnum(dev);
441 event->devpath = udev_device_get_devpath(dev);
442 event->devpath_len = strlen(event->devpath);
443 event->devpath_old = udev_device_get_devpath_old(dev);
444 event->devnum = udev_device_get_devnum(dev);
445 event->is_block = streq("block", udev_device_get_subsystem(dev));
446 event->ifindex = udev_device_get_ifindex(dev);
447 #ifdef HAVE_FIRMWARE
448 if (streq(udev_device_get_subsystem(dev), "firmware"))
449 event->nodelay = true;
450 #endif
451
452 udev_queue_export_device_queued(udev_queue_export, dev);
453 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
454 udev_device_get_action(dev), udev_device_get_subsystem(dev));
455
456 event->state = EVENT_QUEUED;
457 udev_list_node_append(&event->node, &event_list);
458 return 0;
459 }
460
461 static void worker_kill(struct udev *udev)
462 {
463 struct udev_list_node *loop;
464
465 udev_list_node_foreach(loop, &worker_list) {
466 struct worker *worker = node_to_worker(loop);
467
468 if (worker->state == WORKER_KILLED)
469 continue;
470
471 worker->state = WORKER_KILLED;
472 kill(worker->pid, SIGTERM);
473 }
474 }
475
476 /* lookup event for identical, parent, child device */
477 static bool is_devpath_busy(struct event *event)
478 {
479 struct udev_list_node *loop;
480 size_t common;
481
482 /* check if queue contains events we depend on */
483 udev_list_node_foreach(loop, &event_list) {
484 struct event *loop_event = node_to_event(loop);
485
486 /* we already found a later event, earlier can not block us, no need to check again */
487 if (loop_event->seqnum < event->delaying_seqnum)
488 continue;
489
490 /* event we checked earlier still exists, no need to check again */
491 if (loop_event->seqnum == event->delaying_seqnum)
492 return true;
493
494 /* found ourself, no later event can block us */
495 if (loop_event->seqnum >= event->seqnum)
496 break;
497
498 /* check major/minor */
499 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
500 return true;
501
502 /* check network device ifindex */
503 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
504 return true;
505
506 /* check our old name */
507 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
508 event->delaying_seqnum = loop_event->seqnum;
509 return true;
510 }
511
512 /* compare devpath */
513 common = MIN(loop_event->devpath_len, event->devpath_len);
514
515 /* one devpath is contained in the other? */
516 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
517 continue;
518
519 /* identical device event found */
520 if (loop_event->devpath_len == event->devpath_len) {
521 /* devices names might have changed/swapped in the meantime */
522 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
523 continue;
524 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
525 continue;
526 event->delaying_seqnum = loop_event->seqnum;
527 return true;
528 }
529
530 #ifdef HAVE_FIRMWARE
531 /* allow to bypass the dependency tracking */
532 if (event->nodelay)
533 continue;
534 #endif
535
536 /* parent device event found */
537 if (event->devpath[common] == '/') {
538 event->delaying_seqnum = loop_event->seqnum;
539 return true;
540 }
541
542 /* child device event found */
543 if (loop_event->devpath[common] == '/') {
544 event->delaying_seqnum = loop_event->seqnum;
545 return true;
546 }
547
548 /* no matching device */
549 continue;
550 }
551
552 return false;
553 }
554
555 static void event_queue_start(struct udev *udev)
556 {
557 struct udev_list_node *loop;
558
559 udev_list_node_foreach(loop, &event_list) {
560 struct event *event = node_to_event(loop);
561
562 if (event->state != EVENT_QUEUED)
563 continue;
564
565 /* do not start event if parent or child event is still running */
566 if (is_devpath_busy(event))
567 continue;
568
569 event_run(event);
570 }
571 }
572
573 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
574 {
575 struct udev_list_node *loop, *tmp;
576
577 udev_list_node_foreach_safe(loop, tmp, &event_list) {
578 struct event *event = node_to_event(loop);
579
580 if (match_type != EVENT_UNDEF && match_type != event->state)
581 continue;
582
583 event_queue_delete(event, false);
584 }
585 }
586
587 static void worker_returned(int fd_worker)
588 {
589 for (;;) {
590 struct worker_message msg;
591 ssize_t size;
592 struct udev_list_node *loop;
593
594 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
595 if (size != sizeof(struct worker_message))
596 break;
597
598 /* lookup worker who sent the signal */
599 udev_list_node_foreach(loop, &worker_list) {
600 struct worker *worker = node_to_worker(loop);
601
602 if (worker->pid != msg.pid)
603 continue;
604
605 /* worker returned */
606 if (worker->event) {
607 worker->event->exitcode = msg.exitcode;
608 event_queue_delete(worker->event, true);
609 worker->event = NULL;
610 }
611 if (worker->state != WORKER_KILLED)
612 worker->state = WORKER_IDLE;
613 worker_unref(worker);
614 break;
615 }
616 }
617 }
618
619 /* receive the udevd message from userspace */
620 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
621 {
622 struct udev *udev = udev_ctrl_get_udev(uctrl);
623 struct udev_ctrl_connection *ctrl_conn;
624 struct udev_ctrl_msg *ctrl_msg = NULL;
625 const char *str;
626 int i;
627
628 ctrl_conn = udev_ctrl_get_connection(uctrl);
629 if (ctrl_conn == NULL)
630 goto out;
631
632 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
633 if (ctrl_msg == NULL)
634 goto out;
635
636 i = udev_ctrl_get_set_log_level(ctrl_msg);
637 if (i >= 0) {
638 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
639 log_set_max_level(i);
640 udev_set_log_priority(udev, i);
641 worker_kill(udev);
642 }
643
644 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
645 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
646 stop_exec_queue = true;
647 }
648
649 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
650 log_debug("udevd message (START_EXEC_QUEUE) received\n");
651 stop_exec_queue = false;
652 }
653
654 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
655 log_debug("udevd message (RELOAD) received\n");
656 reload = true;
657 }
658
659 str = udev_ctrl_get_set_env(ctrl_msg);
660 if (str != NULL) {
661 char *key;
662
663 key = strdup(str);
664 if (key != NULL) {
665 char *val;
666
667 val = strchr(key, '=');
668 if (val != NULL) {
669 val[0] = '\0';
670 val = &val[1];
671 if (val[0] == '\0') {
672 log_debug("udevd message (ENV) received, unset '%s'\n", key);
673 udev_add_property(udev, key, NULL);
674 } else {
675 log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val);
676 udev_add_property(udev, key, val);
677 }
678 } else {
679 log_error("wrong key format '%s'\n", key);
680 }
681 free(key);
682 }
683 worker_kill(udev);
684 }
685
686 i = udev_ctrl_get_set_children_max(ctrl_msg);
687 if (i >= 0) {
688 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
689 children_max = i;
690 }
691
692 if (udev_ctrl_get_ping(ctrl_msg) > 0)
693 log_debug("udevd message (SYNC) received\n");
694
695 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
696 log_debug("udevd message (EXIT) received\n");
697 udev_exit = true;
698 /* keep reference to block the client until we exit */
699 udev_ctrl_connection_ref(ctrl_conn);
700 }
701 out:
702 udev_ctrl_msg_unref(ctrl_msg);
703 return udev_ctrl_connection_unref(ctrl_conn);
704 }
705
706 /* read inotify messages */
707 static int handle_inotify(struct udev *udev)
708 {
709 int nbytes, pos;
710 char *buf;
711 struct inotify_event *ev;
712
713 if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
714 return 0;
715
716 buf = malloc(nbytes);
717 if (buf == NULL) {
718 log_error("error getting buffer for inotify\n");
719 return -1;
720 }
721
722 nbytes = read(fd_inotify, buf, nbytes);
723
724 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
725 struct udev_device *dev;
726
727 ev = (struct inotify_event *)(buf + pos);
728 dev = udev_watch_lookup(udev, ev->wd);
729 if (dev != NULL) {
730 log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
731 if (ev->mask & IN_CLOSE_WRITE) {
732 char filename[UTIL_PATH_SIZE];
733 int fd;
734
735 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
736 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
737 fd = open(filename, O_WRONLY);
738 if (fd >= 0) {
739 if (write(fd, "change", 6) < 0)
740 log_debug("error writing uevent: %m\n");
741 close(fd);
742 }
743 }
744 if (ev->mask & IN_IGNORED)
745 udev_watch_end(udev, dev);
746
747 udev_device_unref(dev);
748 }
749
750 }
751
752 free(buf);
753 return 0;
754 }
755
756 static void handle_signal(struct udev *udev, int signo)
757 {
758 switch (signo) {
759 case SIGINT:
760 case SIGTERM:
761 udev_exit = true;
762 break;
763 case SIGCHLD:
764 for (;;) {
765 pid_t pid;
766 int status;
767 struct udev_list_node *loop, *tmp;
768
769 pid = waitpid(-1, &status, WNOHANG);
770 if (pid <= 0)
771 break;
772
773 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
774 struct worker *worker = node_to_worker(loop);
775
776 if (worker->pid != pid)
777 continue;
778 log_debug("worker [%u] exit\n", pid);
779
780 if (WIFEXITED(status)) {
781 if (WEXITSTATUS(status) != 0)
782 log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
783 } else if (WIFSIGNALED(status)) {
784 log_error("worker [%u] terminated by signal %i (%s)\n",
785 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
786 } else if (WIFSTOPPED(status)) {
787 log_error("worker [%u] stopped\n", pid);
788 } else if (WIFCONTINUED(status)) {
789 log_error("worker [%u] continued\n", pid);
790 } else {
791 log_error("worker [%u] exit with status 0x%04x\n", pid, status);
792 }
793
794 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
795 if (worker->event) {
796 log_error("worker [%u] failed while handling '%s'\n",
797 pid, worker->event->devpath);
798 worker->event->exitcode = -32;
799 event_queue_delete(worker->event, true);
800 /* drop reference taken for state 'running' */
801 worker_unref(worker);
802 }
803 }
804 worker_unref(worker);
805 break;
806 }
807 }
808 break;
809 case SIGHUP:
810 reload = true;
811 break;
812 }
813 }
814
815 static void static_dev_create_from_modules(struct udev *udev)
816 {
817 struct utsname kernel;
818 char modules[UTIL_PATH_SIZE];
819 char buf[4096];
820 FILE *f;
821
822 if (uname(&kernel) < 0) {
823 log_error("uname failed: %m");
824 return;
825 }
826
827 strscpyl(modules, sizeof(modules), ROOTPREFIX "/lib/modules/", kernel.release, "/modules.devname", NULL);
828 f = fopen(modules, "re");
829 if (f == NULL)
830 return;
831
832 while (fgets(buf, sizeof(buf), f) != NULL) {
833 char *s;
834 const char *modname;
835 const char *devname;
836 const char *devno;
837 int maj, min;
838 char type;
839 mode_t mode;
840 char filename[UTIL_PATH_SIZE];
841
842 if (buf[0] == '#')
843 continue;
844
845 modname = buf;
846 s = strchr(modname, ' ');
847 if (s == NULL)
848 continue;
849 s[0] = '\0';
850
851 devname = &s[1];
852 s = strchr(devname, ' ');
853 if (s == NULL)
854 continue;
855 s[0] = '\0';
856
857 devno = &s[1];
858 s = strchr(devno, ' ');
859 if (s == NULL)
860 s = strchr(devno, '\n');
861 if (s != NULL)
862 s[0] = '\0';
863 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
864 continue;
865
866 mode = 0600;
867 if (type == 'c')
868 mode |= S_IFCHR;
869 else if (type == 'b')
870 mode |= S_IFBLK;
871 else
872 continue;
873
874 strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
875 mkdir_parents_label(filename, 0755);
876 label_context_set(filename, mode);
877 log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
878 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
879 utimensat(AT_FDCWD, filename, NULL, 0);
880 label_context_clear();
881 }
882
883 fclose(f);
884 }
885
886 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
887 {
888 int ctrl = -1, netlink = -1;
889 int fd, n;
890
891 n = sd_listen_fds(true);
892 if (n <= 0)
893 return -1;
894
895 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
896 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
897 if (ctrl >= 0)
898 return -1;
899 ctrl = fd;
900 continue;
901 }
902
903 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
904 if (netlink >= 0)
905 return -1;
906 netlink = fd;
907 continue;
908 }
909
910 return -1;
911 }
912
913 if (ctrl < 0 || netlink < 0)
914 return -1;
915
916 log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
917 *rctrl = ctrl;
918 *rnetlink = netlink;
919 return 0;
920 }
921
922 /*
923 * read the kernel commandline, in case we need to get into debug mode
924 * udev.log-priority=<level> syslog priority
925 * udev.children-max=<number of workers> events are fully serialized if set to 1
926 * udev.exec-delay=<number of seconds> delay execution of every executed program
927 */
928 static void kernel_cmdline_options(struct udev *udev)
929 {
930 char *line, *w, *state;
931 size_t l;
932
933 if (read_one_line_file("/proc/cmdline", &line) < 0)
934 return;
935
936 FOREACH_WORD_QUOTED(w, l, line, state) {
937 char *s, *opt;
938
939 s = strndup(w, l);
940 if (!s)
941 break;
942
943 /* accept the same options for the initrd, prefixed with "rd." */
944 if (in_initrd() && startswith(s, "rd."))
945 opt = s + 3;
946 else
947 opt = s;
948
949 if (startswith(opt, "udev.log-priority=")) {
950 int prio;
951
952 prio = util_log_priority(opt + 18);
953 log_set_max_level(prio);
954 udev_set_log_priority(udev, prio);
955 } else if (startswith(opt, "udev.children-max=")) {
956 children_max = strtoul(opt + 18, NULL, 0);
957 } else if (startswith(opt, "udev.exec-delay=")) {
958 exec_delay = strtoul(opt + 16, NULL, 0);
959 }
960
961 free(s);
962 }
963
964 free(line);
965 }
966
967 int main(int argc, char *argv[])
968 {
969 struct udev *udev;
970 sigset_t mask;
971 int daemonize = false;
972 int resolve_names = 1;
973 static const struct option options[] = {
974 { "daemon", no_argument, NULL, 'd' },
975 { "debug", no_argument, NULL, 'D' },
976 { "children-max", required_argument, NULL, 'c' },
977 { "exec-delay", required_argument, NULL, 'e' },
978 { "resolve-names", required_argument, NULL, 'N' },
979 { "help", no_argument, NULL, 'h' },
980 { "version", no_argument, NULL, 'V' },
981 {}
982 };
983 int fd_ctrl = -1;
984 int fd_netlink = -1;
985 int fd_worker = -1;
986 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
987 struct udev_ctrl_connection *ctrl_conn = NULL;
988 int rc = 1;
989
990 udev = udev_new();
991 if (udev == NULL)
992 goto exit;
993
994 log_set_target(LOG_TARGET_AUTO);
995 log_parse_environment();
996 log_open();
997 udev_set_log_fn(udev, udev_main_log);
998 log_debug("version %s\n", VERSION);
999 label_init("/dev");
1000
1001 for (;;) {
1002 int option;
1003
1004 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1005 if (option == -1)
1006 break;
1007
1008 switch (option) {
1009 case 'd':
1010 daemonize = true;
1011 break;
1012 case 'c':
1013 children_max = strtoul(optarg, NULL, 0);
1014 break;
1015 case 'e':
1016 exec_delay = strtoul(optarg, NULL, 0);
1017 break;
1018 case 'D':
1019 debug = true;
1020 log_set_max_level(LOG_DEBUG);
1021 udev_set_log_priority(udev, LOG_DEBUG);
1022 break;
1023 case 'N':
1024 if (streq(optarg, "early")) {
1025 resolve_names = 1;
1026 } else if (streq(optarg, "late")) {
1027 resolve_names = 0;
1028 } else if (streq(optarg, "never")) {
1029 resolve_names = -1;
1030 } else {
1031 fprintf(stderr, "resolve-names must be early, late or never\n");
1032 log_error("resolve-names must be early, late or never\n");
1033 goto exit;
1034 }
1035 break;
1036 case 'h':
1037 printf("Usage: udevd OPTIONS\n"
1038 " --daemon\n"
1039 " --debug\n"
1040 " --children-max=<maximum number of workers>\n"
1041 " --exec-delay=<seconds to wait before executing RUN=>\n"
1042 " --resolve-names=early|late|never\n"
1043 " --version\n"
1044 " --help\n"
1045 "\n");
1046 goto exit;
1047 case 'V':
1048 printf("%s\n", VERSION);
1049 goto exit;
1050 default:
1051 goto exit;
1052 }
1053 }
1054
1055 kernel_cmdline_options(udev);
1056
1057 if (getuid() != 0) {
1058 fprintf(stderr, "root privileges required\n");
1059 log_error("root privileges required\n");
1060 goto exit;
1061 }
1062
1063 /* set umask before creating any file/directory */
1064 chdir("/");
1065 umask(022);
1066
1067 mkdir("/run/udev", 0755);
1068
1069 dev_setup(NULL);
1070 static_dev_create_from_modules(udev);
1071
1072 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1073 if (daemonize) {
1074 int fd;
1075
1076 fd = open("/dev/null", O_RDWR);
1077 if (fd >= 0) {
1078 if (write(STDOUT_FILENO, 0, 0) < 0)
1079 dup2(fd, STDOUT_FILENO);
1080 if (write(STDERR_FILENO, 0, 0) < 0)
1081 dup2(fd, STDERR_FILENO);
1082 if (fd > STDERR_FILENO)
1083 close(fd);
1084 } else {
1085 fprintf(stderr, "cannot open /dev/null\n");
1086 log_error("cannot open /dev/null\n");
1087 }
1088 }
1089
1090 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1091 /* get control and netlink socket from systemd */
1092 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1093 if (udev_ctrl == NULL) {
1094 log_error("error taking over udev control socket");
1095 rc = 1;
1096 goto exit;
1097 }
1098
1099 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1100 if (monitor == NULL) {
1101 log_error("error taking over netlink socket\n");
1102 rc = 3;
1103 goto exit;
1104 }
1105
1106 /* get our own cgroup, we regularly kill everything udev has left behind */
1107 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1108 udev_cgroup = NULL;
1109 } else {
1110 /* open control and netlink socket */
1111 udev_ctrl = udev_ctrl_new(udev);
1112 if (udev_ctrl == NULL) {
1113 fprintf(stderr, "error initializing udev control socket");
1114 log_error("error initializing udev control socket");
1115 rc = 1;
1116 goto exit;
1117 }
1118 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1119
1120 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1121 if (monitor == NULL) {
1122 fprintf(stderr, "error initializing netlink socket\n");
1123 log_error("error initializing netlink socket\n");
1124 rc = 3;
1125 goto exit;
1126 }
1127 fd_netlink = udev_monitor_get_fd(monitor);
1128 }
1129
1130 if (udev_monitor_enable_receiving(monitor) < 0) {
1131 fprintf(stderr, "error binding netlink socket\n");
1132 log_error("error binding netlink socket\n");
1133 rc = 3;
1134 goto exit;
1135 }
1136
1137 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1138 fprintf(stderr, "error binding udev control socket\n");
1139 log_error("error binding udev control socket\n");
1140 rc = 1;
1141 goto exit;
1142 }
1143
1144 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1145
1146 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1147 udev_queue_export = udev_queue_export_new(udev);
1148 if (udev_queue_export == NULL) {
1149 log_error("error creating queue file\n");
1150 goto exit;
1151 }
1152
1153 if (daemonize) {
1154 pid_t pid;
1155
1156 pid = fork();
1157 switch (pid) {
1158 case 0:
1159 break;
1160 case -1:
1161 log_error("fork of daemon failed: %m\n");
1162 rc = 4;
1163 goto exit;
1164 default:
1165 rc = EXIT_SUCCESS;
1166 goto exit_daemonize;
1167 }
1168
1169 setsid();
1170
1171 write_string_file("/proc/self/oom_score_adj", "-1000");
1172 } else {
1173 sd_notify(1, "READY=1");
1174 }
1175
1176 print_kmsg("starting version " VERSION "\n");
1177
1178 if (!debug) {
1179 int fd;
1180
1181 fd = open("/dev/null", O_RDWR);
1182 if (fd >= 0) {
1183 dup2(fd, STDIN_FILENO);
1184 dup2(fd, STDOUT_FILENO);
1185 dup2(fd, STDERR_FILENO);
1186 close(fd);
1187 }
1188 }
1189
1190 fd_inotify = udev_watch_init(udev);
1191 if (fd_inotify < 0) {
1192 fprintf(stderr, "error initializing inotify\n");
1193 log_error("error initializing inotify\n");
1194 rc = 4;
1195 goto exit;
1196 }
1197 udev_watch_restore(udev);
1198
1199 /* block and listen to all signals on signalfd */
1200 sigfillset(&mask);
1201 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1202 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1203 if (fd_signal < 0) {
1204 fprintf(stderr, "error creating signalfd\n");
1205 log_error("error creating signalfd\n");
1206 rc = 5;
1207 goto exit;
1208 }
1209
1210 /* unnamed socket from workers to the main daemon */
1211 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1212 fprintf(stderr, "error creating socketpair\n");
1213 log_error("error creating socketpair\n");
1214 rc = 6;
1215 goto exit;
1216 }
1217 fd_worker = worker_watch[READ_END];
1218
1219 udev_builtin_init(udev);
1220
1221 rules = udev_rules_new(udev, resolve_names);
1222 if (rules == NULL) {
1223 log_error("error reading rules\n");
1224 goto exit;
1225 }
1226
1227 memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1228 ep_ctrl.events = EPOLLIN;
1229 ep_ctrl.data.fd = fd_ctrl;
1230
1231 memset(&ep_inotify, 0, sizeof(struct epoll_event));
1232 ep_inotify.events = EPOLLIN;
1233 ep_inotify.data.fd = fd_inotify;
1234
1235 memset(&ep_signal, 0, sizeof(struct epoll_event));
1236 ep_signal.events = EPOLLIN;
1237 ep_signal.data.fd = fd_signal;
1238
1239 memset(&ep_netlink, 0, sizeof(struct epoll_event));
1240 ep_netlink.events = EPOLLIN;
1241 ep_netlink.data.fd = fd_netlink;
1242
1243 memset(&ep_worker, 0, sizeof(struct epoll_event));
1244 ep_worker.events = EPOLLIN;
1245 ep_worker.data.fd = fd_worker;
1246
1247 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1248 if (fd_ep < 0) {
1249 log_error("error creating epoll fd: %m\n");
1250 goto exit;
1251 }
1252 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1253 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1254 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1255 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1256 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1257 log_error("fail to add fds to epoll: %m\n");
1258 goto exit;
1259 }
1260
1261 if (children_max <= 0) {
1262 cpu_set_t cpu_set;
1263
1264 children_max = 8;
1265
1266 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1267 children_max += CPU_COUNT(&cpu_set) * 2;
1268 }
1269 }
1270 log_debug("set children_max to %u\n", children_max);
1271
1272 udev_rules_apply_static_dev_perms(rules);
1273
1274 udev_list_node_init(&event_list);
1275 udev_list_node_init(&worker_list);
1276
1277 for (;;) {
1278 static usec_t last_usec;
1279 struct epoll_event ev[8];
1280 int fdcount;
1281 int timeout;
1282 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1283 int i;
1284
1285 if (udev_exit) {
1286 /* close sources of new events and discard buffered events */
1287 if (fd_ctrl >= 0) {
1288 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1289 fd_ctrl = -1;
1290 }
1291 if (monitor != NULL) {
1292 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1293 udev_monitor_unref(monitor);
1294 monitor = NULL;
1295 }
1296 if (fd_inotify >= 0) {
1297 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1298 close(fd_inotify);
1299 fd_inotify = -1;
1300 }
1301
1302 /* discard queued events and kill workers */
1303 event_queue_cleanup(udev, EVENT_QUEUED);
1304 worker_kill(udev);
1305
1306 /* exit after all has cleaned up */
1307 if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1308 break;
1309
1310 /* timeout at exit for workers to finish */
1311 timeout = 30 * 1000;
1312 } else if (udev_list_node_is_empty(&event_list) && !children) {
1313 /* we are idle */
1314 timeout = -1;
1315
1316 /* cleanup possible left-over processes in our cgroup */
1317 if (udev_cgroup)
1318 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1319 } else {
1320 /* kill idle or hanging workers */
1321 timeout = 3 * 1000;
1322 }
1323 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1324 if (fdcount < 0)
1325 continue;
1326
1327 if (fdcount == 0) {
1328 struct udev_list_node *loop;
1329
1330 /* timeout */
1331 if (udev_exit) {
1332 log_error("timeout, giving up waiting for workers to finish\n");
1333 break;
1334 }
1335
1336 /* kill idle workers */
1337 if (udev_list_node_is_empty(&event_list)) {
1338 log_debug("cleanup idle workers\n");
1339 worker_kill(udev);
1340 }
1341
1342 /* check for hanging events */
1343 udev_list_node_foreach(loop, &worker_list) {
1344 struct worker *worker = node_to_worker(loop);
1345
1346 if (worker->state != WORKER_RUNNING)
1347 continue;
1348
1349 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
1350 log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1351 worker->event ? worker->event->devpath : "<idle>");
1352 kill(worker->pid, SIGKILL);
1353 worker->state = WORKER_KILLED;
1354 /* drop reference taken for state 'running' */
1355 worker_unref(worker);
1356 if (worker->event) {
1357 log_error("seq %llu '%s' killed\n",
1358 udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1359 worker->event->exitcode = -64;
1360 event_queue_delete(worker->event, true);
1361 worker->event = NULL;
1362 }
1363 }
1364 }
1365
1366 }
1367
1368 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1369 for (i = 0; i < fdcount; i++) {
1370 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1371 is_worker = true;
1372 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1373 is_netlink = true;
1374 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1375 is_signal = true;
1376 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1377 is_inotify = true;
1378 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1379 is_ctrl = true;
1380 }
1381
1382 /* check for changed config, every 3 seconds at most */
1383 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
1384 if (udev_rules_check_timestamp(rules))
1385 reload = true;
1386 if (udev_builtin_validate(udev))
1387 reload = true;
1388
1389 last_usec = now(CLOCK_MONOTONIC);
1390 }
1391
1392 /* reload requested, HUP signal received, rules changed, builtin changed */
1393 if (reload) {
1394 worker_kill(udev);
1395 rules = udev_rules_unref(rules);
1396 udev_builtin_exit(udev);
1397 reload = false;
1398 }
1399
1400 /* event has finished */
1401 if (is_worker)
1402 worker_returned(fd_worker);
1403
1404 if (is_netlink) {
1405 struct udev_device *dev;
1406
1407 dev = udev_monitor_receive_device(monitor);
1408 if (dev != NULL) {
1409 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1410 if (event_queue_insert(dev) < 0)
1411 udev_device_unref(dev);
1412 }
1413 }
1414
1415 /* start new events */
1416 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1417 udev_builtin_init(udev);
1418 if (rules == NULL)
1419 rules = udev_rules_new(udev, resolve_names);
1420 if (rules != NULL)
1421 event_queue_start(udev);
1422 }
1423
1424 if (is_signal) {
1425 struct signalfd_siginfo fdsi;
1426 ssize_t size;
1427
1428 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1429 if (size == sizeof(struct signalfd_siginfo))
1430 handle_signal(udev, fdsi.ssi_signo);
1431 }
1432
1433 /* we are shutting down, the events below are not handled anymore */
1434 if (udev_exit)
1435 continue;
1436
1437 /* device node watch */
1438 if (is_inotify)
1439 handle_inotify(udev);
1440
1441 /*
1442 * This needs to be after the inotify handling, to make sure,
1443 * that the ping is send back after the possibly generated
1444 * "change" events by the inotify device node watch.
1445 *
1446 * A single time we may receive a client connection which we need to
1447 * keep open to block the client. It will be closed right before we
1448 * exit.
1449 */
1450 if (is_ctrl)
1451 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1452 }
1453
1454 rc = EXIT_SUCCESS;
1455 exit:
1456 udev_queue_export_cleanup(udev_queue_export);
1457 udev_ctrl_cleanup(udev_ctrl);
1458 exit_daemonize:
1459 if (fd_ep >= 0)
1460 close(fd_ep);
1461 worker_list_cleanup(udev);
1462 event_queue_cleanup(udev, EVENT_UNDEF);
1463 udev_rules_unref(rules);
1464 udev_builtin_exit(udev);
1465 if (fd_signal >= 0)
1466 close(fd_signal);
1467 if (worker_watch[READ_END] >= 0)
1468 close(worker_watch[READ_END]);
1469 if (worker_watch[WRITE_END] >= 0)
1470 close(worker_watch[WRITE_END]);
1471 udev_monitor_unref(monitor);
1472 udev_queue_export_unref(udev_queue_export);
1473 udev_ctrl_connection_unref(ctrl_conn);
1474 udev_ctrl_unref(udev_ctrl);
1475 label_finish();
1476 udev_unref(udev);
1477 log_close();
1478 return rc;
1479 }
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