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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 bool nodelay;
102 };
103
104 static inline struct event *node_to_event(struct udev_list_node *node)
105 {
106 return container_of(node, struct event, node);
107 }
108
109 static void event_queue_cleanup(struct udev *udev, enum event_state type);
110
111 enum worker_state {
112 WORKER_UNDEF,
113 WORKER_RUNNING,
114 WORKER_IDLE,
115 WORKER_KILLED,
116 };
117
118 struct worker {
119 struct udev_list_node node;
120 struct udev *udev;
121 int refcount;
122 pid_t pid;
123 struct udev_monitor *monitor;
124 enum worker_state state;
125 struct event *event;
126 usec_t event_start_usec;
127 };
128
129 /* passed from worker to main process */
130 struct worker_message {
131 pid_t pid;
132 int exitcode;
133 };
134
135 static inline struct worker *node_to_worker(struct udev_list_node *node)
136 {
137 return container_of(node, struct worker, node);
138 }
139
140 static void event_queue_delete(struct event *event, bool export)
141 {
142 udev_list_node_remove(&event->node);
143
144 if (export) {
145 udev_queue_export_device_finished(udev_queue_export, event->dev);
146 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
147 }
148 udev_device_unref(event->dev);
149 free(event);
150 }
151
152 static struct worker *worker_ref(struct worker *worker)
153 {
154 worker->refcount++;
155 return worker;
156 }
157
158 static void worker_cleanup(struct worker *worker)
159 {
160 udev_list_node_remove(&worker->node);
161 udev_monitor_unref(worker->monitor);
162 children--;
163 free(worker);
164 }
165
166 static void worker_unref(struct worker *worker)
167 {
168 worker->refcount--;
169 if (worker->refcount > 0)
170 return;
171 log_debug("worker [%u] cleaned up\n", worker->pid);
172 worker_cleanup(worker);
173 }
174
175 static void worker_list_cleanup(struct udev *udev)
176 {
177 struct udev_list_node *loop, *tmp;
178
179 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
180 struct worker *worker = node_to_worker(loop);
181
182 worker_cleanup(worker);
183 }
184 }
185
186 static void worker_new(struct event *event)
187 {
188 struct udev *udev = event->udev;
189 struct worker *worker;
190 struct udev_monitor *worker_monitor;
191 pid_t pid;
192
193 /* listen for new events */
194 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
195 if (worker_monitor == NULL)
196 return;
197 /* allow the main daemon netlink address to send devices to the worker */
198 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
199 udev_monitor_enable_receiving(worker_monitor);
200
201 worker = calloc(1, sizeof(struct worker));
202 if (worker == NULL) {
203 udev_monitor_unref(worker_monitor);
204 return;
205 }
206 /* worker + event reference */
207 worker->refcount = 2;
208 worker->udev = udev;
209
210 pid = fork();
211 switch (pid) {
212 case 0: {
213 struct udev_device *dev = NULL;
214 int fd_monitor;
215 struct epoll_event ep_signal, ep_monitor;
216 sigset_t mask;
217 int rc = EXIT_SUCCESS;
218
219 /* take initial device from queue */
220 dev = event->dev;
221 event->dev = NULL;
222
223 free(worker);
224 worker_list_cleanup(udev);
225 event_queue_cleanup(udev, EVENT_UNDEF);
226 udev_queue_export_unref(udev_queue_export);
227 udev_monitor_unref(monitor);
228 udev_ctrl_unref(udev_ctrl);
229 close(fd_signal);
230 close(fd_ep);
231 close(worker_watch[READ_END]);
232
233 sigfillset(&mask);
234 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
235 if (fd_signal < 0) {
236 log_error("error creating signalfd %m\n");
237 rc = 2;
238 goto out;
239 }
240
241 fd_ep = epoll_create1(EPOLL_CLOEXEC);
242 if (fd_ep < 0) {
243 log_error("error creating epoll fd: %m\n");
244 rc = 3;
245 goto out;
246 }
247
248 memset(&ep_signal, 0, sizeof(struct epoll_event));
249 ep_signal.events = EPOLLIN;
250 ep_signal.data.fd = fd_signal;
251
252 fd_monitor = udev_monitor_get_fd(worker_monitor);
253 memset(&ep_monitor, 0, sizeof(struct epoll_event));
254 ep_monitor.events = EPOLLIN;
255 ep_monitor.data.fd = fd_monitor;
256
257 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
258 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
259 log_error("fail to add fds to epoll: %m\n");
260 rc = 4;
261 goto out;
262 }
263
264 /* request TERM signal if parent exits */
265 prctl(PR_SET_PDEATHSIG, SIGTERM);
266
267 /* reset OOM score, we only protect the main daemon */
268 write_one_line_file("/proc/self/oom_score_adj", "0");
269
270 for (;;) {
271 struct udev_event *udev_event;
272 struct worker_message msg;
273 int err;
274
275 log_debug("seq %llu running\n", udev_device_get_seqnum(dev));
276 udev_event = udev_event_new(dev);
277 if (udev_event == NULL) {
278 rc = 5;
279 goto out;
280 }
281
282 /* needed for SIGCHLD/SIGTERM in spawn() */
283 udev_event->fd_signal = fd_signal;
284
285 if (exec_delay > 0)
286 udev_event->exec_delay = exec_delay;
287
288 /* apply rules, create node, symlinks */
289 err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
290
291 if (err == 0)
292 udev_event_execute_run(udev_event, &sigmask_orig);
293
294 /* apply/restore inotify watch */
295 if (err == 0 && udev_event->inotify_watch) {
296 udev_watch_begin(udev, dev);
297 udev_device_update_db(dev);
298 }
299
300 /* send processed event back to libudev listeners */
301 udev_monitor_send_device(worker_monitor, NULL, dev);
302
303 /* send udevd the result of the event execution */
304 memset(&msg, 0, sizeof(struct worker_message));
305 if (err != 0)
306 msg.exitcode = err;
307 msg.pid = getpid();
308 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
309
310 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
311
312 udev_device_unref(dev);
313 dev = NULL;
314
315 if (udev_event->sigterm) {
316 udev_event_unref(udev_event);
317 goto out;
318 }
319
320 udev_event_unref(udev_event);
321
322 /* wait for more device messages from main udevd, or term signal */
323 while (dev == NULL) {
324 struct epoll_event ev[4];
325 int fdcount;
326 int i;
327
328 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
329 if (fdcount < 0) {
330 if (errno == EINTR)
331 continue;
332 log_error("failed to poll: %m\n");
333 goto out;
334 }
335
336 for (i = 0; i < fdcount; i++) {
337 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
338 dev = udev_monitor_receive_device(worker_monitor);
339 break;
340 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
341 struct signalfd_siginfo fdsi;
342 ssize_t size;
343
344 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
345 if (size != sizeof(struct signalfd_siginfo))
346 continue;
347 switch (fdsi.ssi_signo) {
348 case SIGTERM:
349 goto out;
350 }
351 }
352 }
353 }
354 }
355 out:
356 udev_device_unref(dev);
357 if (fd_signal >= 0)
358 close(fd_signal);
359 if (fd_ep >= 0)
360 close(fd_ep);
361 close(fd_inotify);
362 close(worker_watch[WRITE_END]);
363 udev_rules_unref(rules);
364 udev_builtin_exit(udev);
365 udev_monitor_unref(worker_monitor);
366 udev_unref(udev);
367 log_close();
368 exit(rc);
369 }
370 case -1:
371 udev_monitor_unref(worker_monitor);
372 event->state = EVENT_QUEUED;
373 free(worker);
374 log_error("fork of child failed: %m\n");
375 break;
376 default:
377 /* close monitor, but keep address around */
378 udev_monitor_disconnect(worker_monitor);
379 worker->monitor = worker_monitor;
380 worker->pid = pid;
381 worker->state = WORKER_RUNNING;
382 worker->event_start_usec = now(CLOCK_MONOTONIC);
383 worker->event = event;
384 event->state = EVENT_RUNNING;
385 udev_list_node_append(&worker->node, &worker_list);
386 children++;
387 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
388 break;
389 }
390 }
391
392 static void event_run(struct event *event)
393 {
394 struct udev_list_node *loop;
395
396 udev_list_node_foreach(loop, &worker_list) {
397 struct worker *worker = node_to_worker(loop);
398 ssize_t count;
399
400 if (worker->state != WORKER_IDLE)
401 continue;
402
403 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
404 if (count < 0) {
405 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
406 kill(worker->pid, SIGKILL);
407 worker->state = WORKER_KILLED;
408 continue;
409 }
410 worker_ref(worker);
411 worker->event = event;
412 worker->state = WORKER_RUNNING;
413 worker->event_start_usec = now(CLOCK_MONOTONIC);
414 event->state = EVENT_RUNNING;
415 return;
416 }
417
418 if (children >= children_max) {
419 if (children_max > 1)
420 log_debug("maximum number (%i) of children reached\n", children);
421 return;
422 }
423
424 /* start new worker and pass initial device */
425 worker_new(event);
426 }
427
428 static int event_queue_insert(struct udev_device *dev)
429 {
430 struct event *event;
431
432 event = calloc(1, sizeof(struct event));
433 if (event == NULL)
434 return -1;
435
436 event->udev = udev_device_get_udev(dev);
437 event->dev = dev;
438 event->seqnum = udev_device_get_seqnum(dev);
439 event->devpath = udev_device_get_devpath(dev);
440 event->devpath_len = strlen(event->devpath);
441 event->devpath_old = udev_device_get_devpath_old(dev);
442 event->devnum = udev_device_get_devnum(dev);
443 event->is_block = streq("block", udev_device_get_subsystem(dev));
444 event->ifindex = udev_device_get_ifindex(dev);
445 if (streq(udev_device_get_subsystem(dev), "firmware"))
446 event->nodelay = true;
447
448 udev_queue_export_device_queued(udev_queue_export, dev);
449 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
450 udev_device_get_action(dev), udev_device_get_subsystem(dev));
451
452 event->state = EVENT_QUEUED;
453 udev_list_node_append(&event->node, &event_list);
454 return 0;
455 }
456
457 static void worker_kill(struct udev *udev)
458 {
459 struct udev_list_node *loop;
460
461 udev_list_node_foreach(loop, &worker_list) {
462 struct worker *worker = node_to_worker(loop);
463
464 if (worker->state == WORKER_KILLED)
465 continue;
466
467 worker->state = WORKER_KILLED;
468 kill(worker->pid, SIGTERM);
469 }
470 }
471
472 /* lookup event for identical, parent, child device */
473 static bool is_devpath_busy(struct event *event)
474 {
475 struct udev_list_node *loop;
476 size_t common;
477
478 /* check if queue contains events we depend on */
479 udev_list_node_foreach(loop, &event_list) {
480 struct event *loop_event = node_to_event(loop);
481
482 /* we already found a later event, earlier can not block us, no need to check again */
483 if (loop_event->seqnum < event->delaying_seqnum)
484 continue;
485
486 /* event we checked earlier still exists, no need to check again */
487 if (loop_event->seqnum == event->delaying_seqnum)
488 return true;
489
490 /* found ourself, no later event can block us */
491 if (loop_event->seqnum >= event->seqnum)
492 break;
493
494 /* check major/minor */
495 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
496 return true;
497
498 /* check network device ifindex */
499 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
500 return true;
501
502 /* check our old name */
503 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
504 event->delaying_seqnum = loop_event->seqnum;
505 return true;
506 }
507
508 /* compare devpath */
509 common = MIN(loop_event->devpath_len, event->devpath_len);
510
511 /* one devpath is contained in the other? */
512 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
513 continue;
514
515 /* identical device event found */
516 if (loop_event->devpath_len == event->devpath_len) {
517 /* devices names might have changed/swapped in the meantime */
518 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
519 continue;
520 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
521 continue;
522 event->delaying_seqnum = loop_event->seqnum;
523 return true;
524 }
525
526 /* allow to bypass the dependency tracking */
527 if (event->nodelay)
528 continue;
529
530 /* parent device event found */
531 if (event->devpath[common] == '/') {
532 event->delaying_seqnum = loop_event->seqnum;
533 return true;
534 }
535
536 /* child device event found */
537 if (loop_event->devpath[common] == '/') {
538 event->delaying_seqnum = loop_event->seqnum;
539 return true;
540 }
541
542 /* no matching device */
543 continue;
544 }
545
546 return false;
547 }
548
549 static void event_queue_start(struct udev *udev)
550 {
551 struct udev_list_node *loop;
552
553 udev_list_node_foreach(loop, &event_list) {
554 struct event *event = node_to_event(loop);
555
556 if (event->state != EVENT_QUEUED)
557 continue;
558
559 /* do not start event if parent or child event is still running */
560 if (is_devpath_busy(event))
561 continue;
562
563 event_run(event);
564 }
565 }
566
567 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
568 {
569 struct udev_list_node *loop, *tmp;
570
571 udev_list_node_foreach_safe(loop, tmp, &event_list) {
572 struct event *event = node_to_event(loop);
573
574 if (match_type != EVENT_UNDEF && match_type != event->state)
575 continue;
576
577 event_queue_delete(event, false);
578 }
579 }
580
581 static void worker_returned(int fd_worker)
582 {
583 for (;;) {
584 struct worker_message msg;
585 ssize_t size;
586 struct udev_list_node *loop;
587
588 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
589 if (size != sizeof(struct worker_message))
590 break;
591
592 /* lookup worker who sent the signal */
593 udev_list_node_foreach(loop, &worker_list) {
594 struct worker *worker = node_to_worker(loop);
595
596 if (worker->pid != msg.pid)
597 continue;
598
599 /* worker returned */
600 if (worker->event) {
601 worker->event->exitcode = msg.exitcode;
602 event_queue_delete(worker->event, true);
603 worker->event = NULL;
604 }
605 if (worker->state != WORKER_KILLED)
606 worker->state = WORKER_IDLE;
607 worker_unref(worker);
608 break;
609 }
610 }
611 }
612
613 /* receive the udevd message from userspace */
614 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
615 {
616 struct udev *udev = udev_ctrl_get_udev(uctrl);
617 struct udev_ctrl_connection *ctrl_conn;
618 struct udev_ctrl_msg *ctrl_msg = NULL;
619 const char *str;
620 int i;
621
622 ctrl_conn = udev_ctrl_get_connection(uctrl);
623 if (ctrl_conn == NULL)
624 goto out;
625
626 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
627 if (ctrl_msg == NULL)
628 goto out;
629
630 i = udev_ctrl_get_set_log_level(ctrl_msg);
631 if (i >= 0) {
632 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
633 log_set_max_level(i);
634 udev_set_log_priority(udev, i);
635 worker_kill(udev);
636 }
637
638 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
639 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
640 stop_exec_queue = true;
641 }
642
643 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
644 log_debug("udevd message (START_EXEC_QUEUE) received\n");
645 stop_exec_queue = false;
646 }
647
648 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
649 log_debug("udevd message (RELOAD) received\n");
650 reload = true;
651 }
652
653 str = udev_ctrl_get_set_env(ctrl_msg);
654 if (str != NULL) {
655 char *key;
656
657 key = strdup(str);
658 if (key != NULL) {
659 char *val;
660
661 val = strchr(key, '=');
662 if (val != NULL) {
663 val[0] = '\0';
664 val = &val[1];
665 if (val[0] == '\0') {
666 log_debug("udevd message (ENV) received, unset '%s'\n", key);
667 udev_add_property(udev, key, NULL);
668 } else {
669 log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val);
670 udev_add_property(udev, key, val);
671 }
672 } else {
673 log_error("wrong key format '%s'\n", key);
674 }
675 free(key);
676 }
677 worker_kill(udev);
678 }
679
680 i = udev_ctrl_get_set_children_max(ctrl_msg);
681 if (i >= 0) {
682 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
683 children_max = i;
684 }
685
686 if (udev_ctrl_get_ping(ctrl_msg) > 0)
687 log_debug("udevd message (SYNC) received\n");
688
689 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
690 log_debug("udevd message (EXIT) received\n");
691 udev_exit = true;
692 /* keep reference to block the client until we exit */
693 udev_ctrl_connection_ref(ctrl_conn);
694 }
695 out:
696 udev_ctrl_msg_unref(ctrl_msg);
697 return udev_ctrl_connection_unref(ctrl_conn);
698 }
699
700 /* read inotify messages */
701 static int handle_inotify(struct udev *udev)
702 {
703 int nbytes, pos;
704 char *buf;
705 struct inotify_event *ev;
706
707 if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
708 return 0;
709
710 buf = malloc(nbytes);
711 if (buf == NULL) {
712 log_error("error getting buffer for inotify\n");
713 return -1;
714 }
715
716 nbytes = read(fd_inotify, buf, nbytes);
717
718 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
719 struct udev_device *dev;
720
721 ev = (struct inotify_event *)(buf + pos);
722 dev = udev_watch_lookup(udev, ev->wd);
723 if (dev != NULL) {
724 log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
725 if (ev->mask & IN_CLOSE_WRITE) {
726 char filename[UTIL_PATH_SIZE];
727 int fd;
728
729 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
730 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
731 fd = open(filename, O_WRONLY);
732 if (fd >= 0) {
733 if (write(fd, "change", 6) < 0)
734 log_debug("error writing uevent: %m\n");
735 close(fd);
736 }
737 }
738 if (ev->mask & IN_IGNORED)
739 udev_watch_end(udev, dev);
740
741 udev_device_unref(dev);
742 }
743
744 }
745
746 free(buf);
747 return 0;
748 }
749
750 static void handle_signal(struct udev *udev, int signo)
751 {
752 switch (signo) {
753 case SIGINT:
754 case SIGTERM:
755 udev_exit = true;
756 break;
757 case SIGCHLD:
758 for (;;) {
759 pid_t pid;
760 int status;
761 struct udev_list_node *loop, *tmp;
762
763 pid = waitpid(-1, &status, WNOHANG);
764 if (pid <= 0)
765 break;
766
767 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
768 struct worker *worker = node_to_worker(loop);
769
770 if (worker->pid != pid)
771 continue;
772 log_debug("worker [%u] exit\n", pid);
773
774 if (WIFEXITED(status)) {
775 if (WEXITSTATUS(status) != 0)
776 log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
777 } else if (WIFSIGNALED(status)) {
778 log_error("worker [%u] terminated by signal %i (%s)\n",
779 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
780 } else if (WIFSTOPPED(status)) {
781 log_error("worker [%u] stopped\n", pid);
782 } else if (WIFCONTINUED(status)) {
783 log_error("worker [%u] continued\n", pid);
784 } else {
785 log_error("worker [%u] exit with status 0x%04x\n", pid, status);
786 }
787
788 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
789 if (worker->event) {
790 log_error("worker [%u] failed while handling '%s'\n",
791 pid, worker->event->devpath);
792 worker->event->exitcode = -32;
793 event_queue_delete(worker->event, true);
794 /* drop reference taken for state 'running' */
795 worker_unref(worker);
796 }
797 }
798 worker_unref(worker);
799 break;
800 }
801 }
802 break;
803 case SIGHUP:
804 reload = true;
805 break;
806 }
807 }
808
809 static void static_dev_create_from_modules(struct udev *udev)
810 {
811 struct utsname kernel;
812 char modules[UTIL_PATH_SIZE];
813 char buf[4096];
814 FILE *f;
815
816 uname(&kernel);
817 strscpyl(modules, sizeof(modules), ROOTPREFIX "/lib/modules/", kernel.release, "/modules.devname", NULL);
818 f = fopen(modules, "re");
819 if (f == NULL)
820 return;
821
822 while (fgets(buf, sizeof(buf), f) != NULL) {
823 char *s;
824 const char *modname;
825 const char *devname;
826 const char *devno;
827 int maj, min;
828 char type;
829 mode_t mode;
830 char filename[UTIL_PATH_SIZE];
831
832 if (buf[0] == '#')
833 continue;
834
835 modname = buf;
836 s = strchr(modname, ' ');
837 if (s == NULL)
838 continue;
839 s[0] = '\0';
840
841 devname = &s[1];
842 s = strchr(devname, ' ');
843 if (s == NULL)
844 continue;
845 s[0] = '\0';
846
847 devno = &s[1];
848 s = strchr(devno, ' ');
849 if (s == NULL)
850 s = strchr(devno, '\n');
851 if (s != NULL)
852 s[0] = '\0';
853 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
854 continue;
855
856 mode = 0600;
857 if (type == 'c')
858 mode |= S_IFCHR;
859 else if (type == 'b')
860 mode |= S_IFBLK;
861 else
862 continue;
863
864 strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
865 mkdir_parents_label(filename, 0755);
866 label_context_set(filename, mode);
867 log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
868 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
869 utimensat(AT_FDCWD, filename, NULL, 0);
870 label_context_clear();
871 }
872
873 fclose(f);
874 }
875
876 static int mem_size_mb(void)
877 {
878 FILE *f;
879 char buf[4096];
880 long int memsize = -1;
881
882 f = fopen("/proc/meminfo", "re");
883 if (f == NULL)
884 return -1;
885
886 while (fgets(buf, sizeof(buf), f) != NULL) {
887 long int value;
888
889 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
890 memsize = value / 1024;
891 break;
892 }
893 }
894
895 fclose(f);
896 return memsize;
897 }
898
899 static int convert_db(struct udev *udev)
900 {
901 char filename[UTIL_PATH_SIZE];
902 struct udev_enumerate *udev_enumerate;
903 struct udev_list_entry *list_entry;
904
905 /* current database */
906 if (access("/run/udev/data", F_OK) >= 0)
907 return 0;
908
909 /* make sure we do not get here again */
910 mkdir_p("/run/udev/data", 0755);
911
912 /* old database */
913 strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL);
914 if (access(filename, F_OK) < 0)
915 return 0;
916
917 print_kmsg("converting old udev database\n");
918
919 udev_enumerate = udev_enumerate_new(udev);
920 if (udev_enumerate == NULL)
921 return -1;
922 udev_enumerate_scan_devices(udev_enumerate);
923 udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
924 struct udev_device *device;
925
926 device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
927 if (device == NULL)
928 continue;
929
930 /* try to find the old database for devices without a current one */
931 if (udev_device_read_db(device, NULL) < 0) {
932 bool have_db;
933 const char *id;
934 struct stat stats;
935 char devpath[UTIL_PATH_SIZE];
936 char from[UTIL_PATH_SIZE];
937
938 have_db = false;
939
940 /* find database in old location */
941 id = udev_device_get_id_filename(device);
942 strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL);
943 if (lstat(from, &stats) == 0) {
944 if (!have_db) {
945 udev_device_read_db(device, from);
946 have_db = true;
947 }
948 unlink(from);
949 }
950
951 /* find old database with $subsys:$sysname name */
952 strscpyl(from, sizeof(from), "/dev/.udev/db/",
953 udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL);
954 if (lstat(from, &stats) == 0) {
955 if (!have_db) {
956 udev_device_read_db(device, from);
957 have_db = true;
958 }
959 unlink(from);
960 }
961
962 /* find old database with the encoded devpath name */
963 util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
964 strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL);
965 if (lstat(from, &stats) == 0) {
966 if (!have_db) {
967 udev_device_read_db(device, from);
968 have_db = true;
969 }
970 unlink(from);
971 }
972
973 /* write out new database */
974 if (have_db)
975 udev_device_update_db(device);
976 }
977 udev_device_unref(device);
978 }
979 udev_enumerate_unref(udev_enumerate);
980 return 0;
981 }
982
983 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
984 {
985 int ctrl = -1, netlink = -1;
986 int fd, n;
987
988 n = sd_listen_fds(true);
989 if (n <= 0)
990 return -1;
991
992 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
993 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
994 if (ctrl >= 0)
995 return -1;
996 ctrl = fd;
997 continue;
998 }
999
1000 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
1001 if (netlink >= 0)
1002 return -1;
1003 netlink = fd;
1004 continue;
1005 }
1006
1007 return -1;
1008 }
1009
1010 if (ctrl < 0 || netlink < 0)
1011 return -1;
1012
1013 log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
1014 *rctrl = ctrl;
1015 *rnetlink = netlink;
1016 return 0;
1017 }
1018
1019 /*
1020 * read the kernel commandline, in case we need to get into debug mode
1021 * udev.log-priority=<level> syslog priority
1022 * udev.children-max=<number of workers> events are fully serialized if set to 1
1023 * udev.exec-delay=<number of seconds> delay execution of every executed program
1024 */
1025 static void kernel_cmdline_options(struct udev *udev)
1026 {
1027 char *line, *w, *state;
1028 size_t l;
1029
1030 if (read_one_line_file("/proc/cmdline", &line) < 0)
1031 return;
1032
1033 FOREACH_WORD_QUOTED(w, l, line, state) {
1034 char *s, *opt;
1035
1036 s = strndup(w, l);
1037 if (!s)
1038 break;
1039
1040 /* accept the same options for the initrd, prefixed with "rd." */
1041 if (in_initrd() && startswith(s, "rd."))
1042 opt = s + 3;
1043 else
1044 opt = s;
1045
1046 if (startswith(opt, "udev.log-priority=")) {
1047 int prio;
1048
1049 prio = util_log_priority(opt + 18);
1050 log_set_max_level(prio);
1051 udev_set_log_priority(udev, prio);
1052 } else if (startswith(opt, "udev.children-max=")) {
1053 children_max = strtoul(opt + 18, NULL, 0);
1054 } else if (startswith(opt, "udev.exec-delay=")) {
1055 exec_delay = strtoul(opt + 16, NULL, 0);
1056 }
1057
1058 free(s);
1059 }
1060
1061 free(line);
1062 }
1063
1064 int main(int argc, char *argv[])
1065 {
1066 struct udev *udev;
1067 sigset_t mask;
1068 int daemonize = false;
1069 int resolve_names = 1;
1070 static const struct option options[] = {
1071 { "daemon", no_argument, NULL, 'd' },
1072 { "debug", no_argument, NULL, 'D' },
1073 { "children-max", required_argument, NULL, 'c' },
1074 { "exec-delay", required_argument, NULL, 'e' },
1075 { "resolve-names", required_argument, NULL, 'N' },
1076 { "help", no_argument, NULL, 'h' },
1077 { "version", no_argument, NULL, 'V' },
1078 {}
1079 };
1080 int fd_ctrl = -1;
1081 int fd_netlink = -1;
1082 int fd_worker = -1;
1083 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1084 struct udev_ctrl_connection *ctrl_conn = NULL;
1085 int rc = 1;
1086
1087 udev = udev_new();
1088 if (udev == NULL)
1089 goto exit;
1090
1091 log_set_target(LOG_TARGET_AUTO);
1092 log_parse_environment();
1093 log_open();
1094 udev_set_log_fn(udev, udev_main_log);
1095 log_debug("version %s\n", VERSION);
1096 label_init("/dev");
1097
1098 for (;;) {
1099 int option;
1100
1101 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1102 if (option == -1)
1103 break;
1104
1105 switch (option) {
1106 case 'd':
1107 daemonize = true;
1108 break;
1109 case 'c':
1110 children_max = strtoul(optarg, NULL, 0);
1111 break;
1112 case 'e':
1113 exec_delay = strtoul(optarg, NULL, 0);
1114 break;
1115 case 'D':
1116 debug = true;
1117 log_set_max_level(LOG_DEBUG);
1118 udev_set_log_priority(udev, LOG_DEBUG);
1119 break;
1120 case 'N':
1121 if (streq(optarg, "early")) {
1122 resolve_names = 1;
1123 } else if (streq(optarg, "late")) {
1124 resolve_names = 0;
1125 } else if (streq(optarg, "never")) {
1126 resolve_names = -1;
1127 } else {
1128 fprintf(stderr, "resolve-names must be early, late or never\n");
1129 log_error("resolve-names must be early, late or never\n");
1130 goto exit;
1131 }
1132 break;
1133 case 'h':
1134 printf("Usage: udevd OPTIONS\n"
1135 " --daemon\n"
1136 " --debug\n"
1137 " --children-max=<maximum number of workers>\n"
1138 " --exec-delay=<seconds to wait before executing RUN=>\n"
1139 " --resolve-names=early|late|never\n"
1140 " --version\n"
1141 " --help\n"
1142 "\n");
1143 goto exit;
1144 case 'V':
1145 printf("%s\n", VERSION);
1146 goto exit;
1147 default:
1148 goto exit;
1149 }
1150 }
1151
1152 kernel_cmdline_options(udev);
1153
1154 if (getuid() != 0) {
1155 fprintf(stderr, "root privileges required\n");
1156 log_error("root privileges required\n");
1157 goto exit;
1158 }
1159
1160 /* set umask before creating any file/directory */
1161 chdir("/");
1162 umask(022);
1163
1164 mkdir("/run/udev", 0755);
1165
1166 dev_setup(NULL);
1167 static_dev_create_from_modules(udev);
1168
1169 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1170 if (daemonize) {
1171 int fd;
1172
1173 fd = open("/dev/null", O_RDWR);
1174 if (fd >= 0) {
1175 if (write(STDOUT_FILENO, 0, 0) < 0)
1176 dup2(fd, STDOUT_FILENO);
1177 if (write(STDERR_FILENO, 0, 0) < 0)
1178 dup2(fd, STDERR_FILENO);
1179 if (fd > STDERR_FILENO)
1180 close(fd);
1181 } else {
1182 fprintf(stderr, "cannot open /dev/null\n");
1183 log_error("cannot open /dev/null\n");
1184 }
1185 }
1186
1187 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1188 /* get control and netlink socket from systemd */
1189 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1190 if (udev_ctrl == NULL) {
1191 log_error("error taking over udev control socket");
1192 rc = 1;
1193 goto exit;
1194 }
1195
1196 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1197 if (monitor == NULL) {
1198 log_error("error taking over netlink socket\n");
1199 rc = 3;
1200 goto exit;
1201 }
1202
1203 /* get our own cgroup, we regularly kill everything udev has left behind */
1204 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1205 udev_cgroup = NULL;
1206 } else {
1207 /* open control and netlink socket */
1208 udev_ctrl = udev_ctrl_new(udev);
1209 if (udev_ctrl == NULL) {
1210 fprintf(stderr, "error initializing udev control socket");
1211 log_error("error initializing udev control socket");
1212 rc = 1;
1213 goto exit;
1214 }
1215 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1216
1217 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1218 if (monitor == NULL) {
1219 fprintf(stderr, "error initializing netlink socket\n");
1220 log_error("error initializing netlink socket\n");
1221 rc = 3;
1222 goto exit;
1223 }
1224 fd_netlink = udev_monitor_get_fd(monitor);
1225 }
1226
1227 if (udev_monitor_enable_receiving(monitor) < 0) {
1228 fprintf(stderr, "error binding netlink socket\n");
1229 log_error("error binding netlink socket\n");
1230 rc = 3;
1231 goto exit;
1232 }
1233
1234 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1235 fprintf(stderr, "error binding udev control socket\n");
1236 log_error("error binding udev control socket\n");
1237 rc = 1;
1238 goto exit;
1239 }
1240
1241 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1242
1243 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1244 udev_queue_export = udev_queue_export_new(udev);
1245 if (udev_queue_export == NULL) {
1246 log_error("error creating queue file\n");
1247 goto exit;
1248 }
1249
1250 if (daemonize) {
1251 pid_t pid;
1252
1253 pid = fork();
1254 switch (pid) {
1255 case 0:
1256 break;
1257 case -1:
1258 log_error("fork of daemon failed: %m\n");
1259 rc = 4;
1260 goto exit;
1261 default:
1262 rc = EXIT_SUCCESS;
1263 goto exit_daemonize;
1264 }
1265
1266 setsid();
1267
1268 write_one_line_file("/proc/self/oom_score_adj", "-1000");
1269 } else {
1270 sd_notify(1, "READY=1");
1271 }
1272
1273 print_kmsg("starting version " VERSION "\n");
1274
1275 if (!debug) {
1276 int fd;
1277
1278 fd = open("/dev/null", O_RDWR);
1279 if (fd >= 0) {
1280 dup2(fd, STDIN_FILENO);
1281 dup2(fd, STDOUT_FILENO);
1282 dup2(fd, STDERR_FILENO);
1283 close(fd);
1284 }
1285 }
1286
1287 fd_inotify = udev_watch_init(udev);
1288 if (fd_inotify < 0) {
1289 fprintf(stderr, "error initializing inotify\n");
1290 log_error("error initializing inotify\n");
1291 rc = 4;
1292 goto exit;
1293 }
1294 udev_watch_restore(udev);
1295
1296 /* block and listen to all signals on signalfd */
1297 sigfillset(&mask);
1298 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1299 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1300 if (fd_signal < 0) {
1301 fprintf(stderr, "error creating signalfd\n");
1302 log_error("error creating signalfd\n");
1303 rc = 5;
1304 goto exit;
1305 }
1306
1307 /* unnamed socket from workers to the main daemon */
1308 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1309 fprintf(stderr, "error creating socketpair\n");
1310 log_error("error creating socketpair\n");
1311 rc = 6;
1312 goto exit;
1313 }
1314 fd_worker = worker_watch[READ_END];
1315
1316 udev_builtin_init(udev);
1317
1318 rules = udev_rules_new(udev, resolve_names);
1319 if (rules == NULL) {
1320 log_error("error reading rules\n");
1321 goto exit;
1322 }
1323
1324 memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1325 ep_ctrl.events = EPOLLIN;
1326 ep_ctrl.data.fd = fd_ctrl;
1327
1328 memset(&ep_inotify, 0, sizeof(struct epoll_event));
1329 ep_inotify.events = EPOLLIN;
1330 ep_inotify.data.fd = fd_inotify;
1331
1332 memset(&ep_signal, 0, sizeof(struct epoll_event));
1333 ep_signal.events = EPOLLIN;
1334 ep_signal.data.fd = fd_signal;
1335
1336 memset(&ep_netlink, 0, sizeof(struct epoll_event));
1337 ep_netlink.events = EPOLLIN;
1338 ep_netlink.data.fd = fd_netlink;
1339
1340 memset(&ep_worker, 0, sizeof(struct epoll_event));
1341 ep_worker.events = EPOLLIN;
1342 ep_worker.data.fd = fd_worker;
1343
1344 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1345 if (fd_ep < 0) {
1346 log_error("error creating epoll fd: %m\n");
1347 goto exit;
1348 }
1349 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1350 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1351 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1352 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1353 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1354 log_error("fail to add fds to epoll: %m\n");
1355 goto exit;
1356 }
1357
1358 /* if needed, convert old database from earlier udev version */
1359 convert_db(udev);
1360
1361 if (children_max <= 0) {
1362 int memsize = mem_size_mb();
1363
1364 /* set value depending on the amount of RAM */
1365 if (memsize > 0)
1366 children_max = 16 + (memsize / 8);
1367 else
1368 children_max = 16;
1369 }
1370 log_debug("set children_max to %u\n", children_max);
1371
1372 udev_rules_apply_static_dev_perms(rules);
1373
1374 udev_list_node_init(&event_list);
1375 udev_list_node_init(&worker_list);
1376
1377 for (;;) {
1378 static usec_t last_usec;
1379 struct epoll_event ev[8];
1380 int fdcount;
1381 int timeout;
1382 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1383 int i;
1384
1385 if (udev_exit) {
1386 /* close sources of new events and discard buffered events */
1387 if (fd_ctrl >= 0) {
1388 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1389 fd_ctrl = -1;
1390 }
1391 if (monitor != NULL) {
1392 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1393 udev_monitor_unref(monitor);
1394 monitor = NULL;
1395 }
1396 if (fd_inotify >= 0) {
1397 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1398 close(fd_inotify);
1399 fd_inotify = -1;
1400 }
1401
1402 /* discard queued events and kill workers */
1403 event_queue_cleanup(udev, EVENT_QUEUED);
1404 worker_kill(udev);
1405
1406 /* exit after all has cleaned up */
1407 if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1408 break;
1409
1410 /* timeout at exit for workers to finish */
1411 timeout = 30 * 1000;
1412 } else if (udev_list_node_is_empty(&event_list) && !children) {
1413 /* we are idle */
1414 timeout = -1;
1415
1416 /* cleanup possible left-over processes in our cgroup */
1417 if (udev_cgroup)
1418 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1419 } else {
1420 /* kill idle or hanging workers */
1421 timeout = 3 * 1000;
1422 }
1423 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1424 if (fdcount < 0)
1425 continue;
1426
1427 if (fdcount == 0) {
1428 struct udev_list_node *loop;
1429
1430 /* timeout */
1431 if (udev_exit) {
1432 log_error("timeout, giving up waiting for workers to finish\n");
1433 break;
1434 }
1435
1436 /* kill idle workers */
1437 if (udev_list_node_is_empty(&event_list)) {
1438 log_debug("cleanup idle workers\n");
1439 worker_kill(udev);
1440 }
1441
1442 /* check for hanging events */
1443 udev_list_node_foreach(loop, &worker_list) {
1444 struct worker *worker = node_to_worker(loop);
1445
1446 if (worker->state != WORKER_RUNNING)
1447 continue;
1448
1449 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) {
1450 log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1451 worker->event ? worker->event->devpath : "<idle>");
1452 kill(worker->pid, SIGKILL);
1453 worker->state = WORKER_KILLED;
1454 /* drop reference taken for state 'running' */
1455 worker_unref(worker);
1456 if (worker->event) {
1457 log_error("seq %llu '%s' killed\n",
1458 udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1459 worker->event->exitcode = -64;
1460 event_queue_delete(worker->event, true);
1461 worker->event = NULL;
1462 }
1463 }
1464 }
1465
1466 }
1467
1468 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1469 for (i = 0; i < fdcount; i++) {
1470 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1471 is_worker = true;
1472 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1473 is_netlink = true;
1474 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1475 is_signal = true;
1476 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1477 is_inotify = true;
1478 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1479 is_ctrl = true;
1480 }
1481
1482 /* check for changed config, every 3 seconds at most */
1483 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) {
1484 if (udev_rules_check_timestamp(rules))
1485 reload = true;
1486 if (udev_builtin_validate(udev))
1487 reload = true;
1488
1489 last_usec = now(CLOCK_MONOTONIC);
1490 }
1491
1492 /* reload requested, HUP signal received, rules changed, builtin changed */
1493 if (reload) {
1494 worker_kill(udev);
1495 rules = udev_rules_unref(rules);
1496 udev_builtin_exit(udev);
1497 reload = false;
1498 }
1499
1500 /* event has finished */
1501 if (is_worker)
1502 worker_returned(fd_worker);
1503
1504 if (is_netlink) {
1505 struct udev_device *dev;
1506
1507 dev = udev_monitor_receive_device(monitor);
1508 if (dev != NULL) {
1509 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1510 if (event_queue_insert(dev) < 0)
1511 udev_device_unref(dev);
1512 }
1513 }
1514
1515 /* start new events */
1516 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1517 udev_builtin_init(udev);
1518 if (rules == NULL)
1519 rules = udev_rules_new(udev, resolve_names);
1520 if (rules != NULL)
1521 event_queue_start(udev);
1522 }
1523
1524 if (is_signal) {
1525 struct signalfd_siginfo fdsi;
1526 ssize_t size;
1527
1528 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1529 if (size == sizeof(struct signalfd_siginfo))
1530 handle_signal(udev, fdsi.ssi_signo);
1531 }
1532
1533 /* we are shutting down, the events below are not handled anymore */
1534 if (udev_exit)
1535 continue;
1536
1537 /* device node watch */
1538 if (is_inotify)
1539 handle_inotify(udev);
1540
1541 /*
1542 * This needs to be after the inotify handling, to make sure,
1543 * that the ping is send back after the possibly generated
1544 * "change" events by the inotify device node watch.
1545 *
1546 * A single time we may receive a client connection which we need to
1547 * keep open to block the client. It will be closed right before we
1548 * exit.
1549 */
1550 if (is_ctrl)
1551 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1552 }
1553
1554 rc = EXIT_SUCCESS;
1555 exit:
1556 udev_queue_export_cleanup(udev_queue_export);
1557 udev_ctrl_cleanup(udev_ctrl);
1558 exit_daemonize:
1559 if (fd_ep >= 0)
1560 close(fd_ep);
1561 worker_list_cleanup(udev);
1562 event_queue_cleanup(udev, EVENT_UNDEF);
1563 udev_rules_unref(rules);
1564 udev_builtin_exit(udev);
1565 if (fd_signal >= 0)
1566 close(fd_signal);
1567 if (worker_watch[READ_END] >= 0)
1568 close(worker_watch[READ_END]);
1569 if (worker_watch[WRITE_END] >= 0)
1570 close(worker_watch[WRITE_END]);
1571 udev_monitor_unref(monitor);
1572 udev_queue_export_unref(udev_queue_export);
1573 udev_ctrl_connection_unref(ctrl_conn);
1574 udev_ctrl_unref(udev_ctrl);
1575 label_finish();
1576 udev_unref(udev);
1577 log_close();
1578 return rc;
1579 }
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