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udev: exclude MD from block device ownership event locking
[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/file.h>
35 #include <sys/time.h>
36 #include <sys/prctl.h>
37 #include <sys/socket.h>
38 #include <sys/un.h>
39 #include <sys/signalfd.h>
40 #include <sys/epoll.h>
41 #include <sys/mount.h>
42 #include <sys/poll.h>
43 #include <sys/wait.h>
44 #include <sys/stat.h>
45 #include <sys/ioctl.h>
46 #include <sys/inotify.h>
47 #include <sys/utsname.h>
48
49 #include "udev.h"
50 #include "udev-util.h"
51 #include "sd-daemon.h"
52 #include "cgroup-util.h"
53 #include "dev-setup.h"
54 #include "fileio.h"
55
56 static bool debug;
57
58 void udev_main_log(struct udev *udev, int priority,
59 const char *file, int line, const char *fn,
60 const char *format, va_list args)
61 {
62 log_metav(priority, file, line, fn, format, args);
63 }
64
65 static struct udev_rules *rules;
66 static struct udev_ctrl *udev_ctrl;
67 static struct udev_monitor *monitor;
68 static int worker_watch[2] = { -1, -1 };
69 static int fd_signal = -1;
70 static int fd_ep = -1;
71 static int fd_inotify = -1;
72 static bool stop_exec_queue;
73 static bool reload;
74 static int children;
75 static int children_max;
76 static int exec_delay;
77 static sigset_t sigmask_orig;
78 static UDEV_LIST(event_list);
79 static UDEV_LIST(worker_list);
80 static char *udev_cgroup;
81 static bool udev_exit;
82
83 enum event_state {
84 EVENT_UNDEF,
85 EVENT_QUEUED,
86 EVENT_RUNNING,
87 };
88
89 struct event {
90 struct udev_list_node node;
91 struct udev *udev;
92 struct udev_device *dev;
93 enum event_state state;
94 int exitcode;
95 unsigned long long int delaying_seqnum;
96 unsigned long long int seqnum;
97 const char *devpath;
98 size_t devpath_len;
99 const char *devpath_old;
100 dev_t devnum;
101 int ifindex;
102 bool is_block;
103 #ifdef HAVE_FIRMWARE
104 bool nodelay;
105 #endif
106 };
107
108 static inline struct event *node_to_event(struct udev_list_node *node)
109 {
110 return container_of(node, struct event, node);
111 }
112
113 static void event_queue_cleanup(struct udev *udev, enum event_state type);
114
115 enum worker_state {
116 WORKER_UNDEF,
117 WORKER_RUNNING,
118 WORKER_IDLE,
119 WORKER_KILLED,
120 };
121
122 struct worker {
123 struct udev_list_node node;
124 struct udev *udev;
125 int refcount;
126 pid_t pid;
127 struct udev_monitor *monitor;
128 enum worker_state state;
129 struct event *event;
130 usec_t event_start_usec;
131 };
132
133 /* passed from worker to main process */
134 struct worker_message {
135 pid_t pid;
136 int exitcode;
137 };
138
139 static inline struct worker *node_to_worker(struct udev_list_node *node)
140 {
141 return container_of(node, struct worker, node);
142 }
143
144 static void event_queue_delete(struct event *event)
145 {
146 udev_list_node_remove(&event->node);
147 udev_device_unref(event->dev);
148 free(event);
149 }
150
151 static struct worker *worker_ref(struct worker *worker)
152 {
153 worker->refcount++;
154 return worker;
155 }
156
157 static void worker_cleanup(struct worker *worker)
158 {
159 udev_list_node_remove(&worker->node);
160 udev_monitor_unref(worker->monitor);
161 children--;
162 free(worker);
163 }
164
165 static void worker_unref(struct worker *worker)
166 {
167 worker->refcount--;
168 if (worker->refcount > 0)
169 return;
170 log_debug("worker [%u] cleaned up", worker->pid);
171 worker_cleanup(worker);
172 }
173
174 static void worker_list_cleanup(struct udev *udev)
175 {
176 struct udev_list_node *loop, *tmp;
177
178 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
179 struct worker *worker = node_to_worker(loop);
180
181 worker_cleanup(worker);
182 }
183 }
184
185 static void worker_new(struct event *event)
186 {
187 struct udev *udev = event->udev;
188 struct worker *worker;
189 struct udev_monitor *worker_monitor;
190 pid_t pid;
191
192 /* listen for new events */
193 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
194 if (worker_monitor == NULL)
195 return;
196 /* allow the main daemon netlink address to send devices to the worker */
197 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
198 udev_monitor_enable_receiving(worker_monitor);
199
200 worker = new0(struct worker, 1);
201 if (worker == NULL) {
202 udev_monitor_unref(worker_monitor);
203 return;
204 }
205 /* worker + event reference */
206 worker->refcount = 2;
207 worker->udev = udev;
208
209 pid = fork();
210 switch (pid) {
211 case 0: {
212 struct udev_device *dev = NULL;
213 int fd_monitor;
214 struct epoll_event ep_signal, ep_monitor;
215 sigset_t mask;
216 int rc = EXIT_SUCCESS;
217
218 /* take initial device from queue */
219 dev = event->dev;
220 event->dev = NULL;
221
222 free(worker);
223 worker_list_cleanup(udev);
224 event_queue_cleanup(udev, EVENT_UNDEF);
225 udev_monitor_unref(monitor);
226 udev_ctrl_unref(udev_ctrl);
227 close(fd_signal);
228 close(fd_ep);
229 close(worker_watch[READ_END]);
230
231 sigfillset(&mask);
232 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
233 if (fd_signal < 0) {
234 log_error("error creating signalfd %m");
235 rc = 2;
236 goto out;
237 }
238
239 fd_ep = epoll_create1(EPOLL_CLOEXEC);
240 if (fd_ep < 0) {
241 log_error("error creating epoll fd: %m");
242 rc = 3;
243 goto out;
244 }
245
246 memzero(&ep_signal, sizeof(struct epoll_event));
247 ep_signal.events = EPOLLIN;
248 ep_signal.data.fd = fd_signal;
249
250 fd_monitor = udev_monitor_get_fd(worker_monitor);
251 memzero(&ep_monitor, sizeof(struct epoll_event));
252 ep_monitor.events = EPOLLIN;
253 ep_monitor.data.fd = fd_monitor;
254
255 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
256 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
257 log_error("fail to add fds to epoll: %m");
258 rc = 4;
259 goto out;
260 }
261
262 /* request TERM signal if parent exits */
263 prctl(PR_SET_PDEATHSIG, SIGTERM);
264
265 /* reset OOM score, we only protect the main daemon */
266 write_string_file("/proc/self/oom_score_adj", "0");
267
268 for (;;) {
269 struct udev_event *udev_event;
270 struct worker_message msg;
271 int fd_lock = -1;
272 int err = 0;
273
274 log_debug("seq %llu running", udev_device_get_seqnum(dev));
275 udev_event = udev_event_new(dev);
276 if (udev_event == NULL) {
277 rc = 5;
278 goto out;
279 }
280
281 /* needed for SIGCHLD/SIGTERM in spawn() */
282 udev_event->fd_signal = fd_signal;
283
284 if (exec_delay > 0)
285 udev_event->exec_delay = exec_delay;
286
287 /*
288 * Take a shared lock on the device node; this establishes
289 * a concept of device "ownership" to serialize device
290 * access. External processes holding an exclusive lock will
291 * cause udev to skip the event handling; in the case udev
292 * acquired the lock, the external process can block until
293 * udev has finished its event handling.
294 */
295 if (!streq_ptr(udev_device_get_action(dev), "remove") &&
296 streq_ptr("block", udev_device_get_subsystem(dev)) &&
297 !startswith(udev_device_get_sysname(dev), "dm-") &&
298 !startswith(udev_device_get_sysname(dev), "md")) {
299 struct udev_device *d = dev;
300
301 if (streq_ptr("partition", udev_device_get_devtype(d)))
302 d = udev_device_get_parent(d);
303
304 if (d) {
305 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
306 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
307 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
308 err = -EWOULDBLOCK;
309 fd_lock = safe_close(fd_lock);
310 goto skip;
311 }
312 }
313 }
314
315 /* apply rules, create node, symlinks */
316 udev_event_execute_rules(udev_event, rules, &sigmask_orig);
317
318 udev_event_execute_run(udev_event, &sigmask_orig);
319
320 /* apply/restore inotify watch */
321 if (udev_event->inotify_watch) {
322 udev_watch_begin(udev, dev);
323 udev_device_update_db(dev);
324 }
325
326 safe_close(fd_lock);
327
328 /* send processed event back to libudev listeners */
329 udev_monitor_send_device(worker_monitor, NULL, dev);
330
331 skip:
332 /* send udevd the result of the event execution */
333 memzero(&msg, sizeof(struct worker_message));
334 msg.exitcode = err;
335 msg.pid = getpid();
336 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
337
338 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
339
340 udev_device_unref(dev);
341 dev = NULL;
342
343 if (udev_event->sigterm) {
344 udev_event_unref(udev_event);
345 goto out;
346 }
347
348 udev_event_unref(udev_event);
349
350 /* wait for more device messages from main udevd, or term signal */
351 while (dev == NULL) {
352 struct epoll_event ev[4];
353 int fdcount;
354 int i;
355
356 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
357 if (fdcount < 0) {
358 if (errno == EINTR)
359 continue;
360 log_error("failed to poll: %m");
361 goto out;
362 }
363
364 for (i = 0; i < fdcount; i++) {
365 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
366 dev = udev_monitor_receive_device(worker_monitor);
367 break;
368 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
369 struct signalfd_siginfo fdsi;
370 ssize_t size;
371
372 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
373 if (size != sizeof(struct signalfd_siginfo))
374 continue;
375 switch (fdsi.ssi_signo) {
376 case SIGTERM:
377 goto out;
378 }
379 }
380 }
381 }
382 }
383 out:
384 udev_device_unref(dev);
385 safe_close(fd_signal);
386 safe_close(fd_ep);
387 close(fd_inotify);
388 close(worker_watch[WRITE_END]);
389 udev_rules_unref(rules);
390 udev_builtin_exit(udev);
391 udev_monitor_unref(worker_monitor);
392 udev_unref(udev);
393 log_close();
394 exit(rc);
395 }
396 case -1:
397 udev_monitor_unref(worker_monitor);
398 event->state = EVENT_QUEUED;
399 free(worker);
400 log_error("fork of child failed: %m");
401 break;
402 default:
403 /* close monitor, but keep address around */
404 udev_monitor_disconnect(worker_monitor);
405 worker->monitor = worker_monitor;
406 worker->pid = pid;
407 worker->state = WORKER_RUNNING;
408 worker->event_start_usec = now(CLOCK_MONOTONIC);
409 worker->event = event;
410 event->state = EVENT_RUNNING;
411 udev_list_node_append(&worker->node, &worker_list);
412 children++;
413 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
414 break;
415 }
416 }
417
418 static void event_run(struct event *event)
419 {
420 struct udev_list_node *loop;
421
422 udev_list_node_foreach(loop, &worker_list) {
423 struct worker *worker = node_to_worker(loop);
424 ssize_t count;
425
426 if (worker->state != WORKER_IDLE)
427 continue;
428
429 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
430 if (count < 0) {
431 log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
432 kill(worker->pid, SIGKILL);
433 worker->state = WORKER_KILLED;
434 continue;
435 }
436 worker_ref(worker);
437 worker->event = event;
438 worker->state = WORKER_RUNNING;
439 worker->event_start_usec = now(CLOCK_MONOTONIC);
440 event->state = EVENT_RUNNING;
441 return;
442 }
443
444 if (children >= children_max) {
445 if (children_max > 1)
446 log_debug("maximum number (%i) of children reached", children);
447 return;
448 }
449
450 /* start new worker and pass initial device */
451 worker_new(event);
452 }
453
454 static int event_queue_insert(struct udev_device *dev)
455 {
456 struct event *event;
457
458 event = new0(struct event, 1);
459 if (event == NULL)
460 return -1;
461
462 event->udev = udev_device_get_udev(dev);
463 event->dev = dev;
464 event->seqnum = udev_device_get_seqnum(dev);
465 event->devpath = udev_device_get_devpath(dev);
466 event->devpath_len = strlen(event->devpath);
467 event->devpath_old = udev_device_get_devpath_old(dev);
468 event->devnum = udev_device_get_devnum(dev);
469 event->is_block = streq("block", udev_device_get_subsystem(dev));
470 event->ifindex = udev_device_get_ifindex(dev);
471 #ifdef HAVE_FIRMWARE
472 if (streq(udev_device_get_subsystem(dev), "firmware"))
473 event->nodelay = true;
474 #endif
475
476 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
477 udev_device_get_action(dev), udev_device_get_subsystem(dev));
478
479 event->state = EVENT_QUEUED;
480 udev_list_node_append(&event->node, &event_list);
481 return 0;
482 }
483
484 static void worker_kill(struct udev *udev)
485 {
486 struct udev_list_node *loop;
487
488 udev_list_node_foreach(loop, &worker_list) {
489 struct worker *worker = node_to_worker(loop);
490
491 if (worker->state == WORKER_KILLED)
492 continue;
493
494 worker->state = WORKER_KILLED;
495 kill(worker->pid, SIGTERM);
496 }
497 }
498
499 /* lookup event for identical, parent, child device */
500 static bool is_devpath_busy(struct event *event)
501 {
502 struct udev_list_node *loop;
503 size_t common;
504
505 /* check if queue contains events we depend on */
506 udev_list_node_foreach(loop, &event_list) {
507 struct event *loop_event = node_to_event(loop);
508
509 /* we already found a later event, earlier can not block us, no need to check again */
510 if (loop_event->seqnum < event->delaying_seqnum)
511 continue;
512
513 /* event we checked earlier still exists, no need to check again */
514 if (loop_event->seqnum == event->delaying_seqnum)
515 return true;
516
517 /* found ourself, no later event can block us */
518 if (loop_event->seqnum >= event->seqnum)
519 break;
520
521 /* check major/minor */
522 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
523 return true;
524
525 /* check network device ifindex */
526 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
527 return true;
528
529 /* check our old name */
530 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
531 event->delaying_seqnum = loop_event->seqnum;
532 return true;
533 }
534
535 /* compare devpath */
536 common = MIN(loop_event->devpath_len, event->devpath_len);
537
538 /* one devpath is contained in the other? */
539 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
540 continue;
541
542 /* identical device event found */
543 if (loop_event->devpath_len == event->devpath_len) {
544 /* devices names might have changed/swapped in the meantime */
545 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
546 continue;
547 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
548 continue;
549 event->delaying_seqnum = loop_event->seqnum;
550 return true;
551 }
552
553 #ifdef HAVE_FIRMWARE
554 /* allow to bypass the dependency tracking */
555 if (event->nodelay)
556 continue;
557 #endif
558
559 /* parent device event found */
560 if (event->devpath[common] == '/') {
561 event->delaying_seqnum = loop_event->seqnum;
562 return true;
563 }
564
565 /* child device event found */
566 if (loop_event->devpath[common] == '/') {
567 event->delaying_seqnum = loop_event->seqnum;
568 return true;
569 }
570
571 /* no matching device */
572 continue;
573 }
574
575 return false;
576 }
577
578 static void event_queue_start(struct udev *udev)
579 {
580 struct udev_list_node *loop;
581
582 udev_list_node_foreach(loop, &event_list) {
583 struct event *event = node_to_event(loop);
584
585 if (event->state != EVENT_QUEUED)
586 continue;
587
588 /* do not start event if parent or child event is still running */
589 if (is_devpath_busy(event))
590 continue;
591
592 event_run(event);
593 }
594 }
595
596 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
597 {
598 struct udev_list_node *loop, *tmp;
599
600 udev_list_node_foreach_safe(loop, tmp, &event_list) {
601 struct event *event = node_to_event(loop);
602
603 if (match_type != EVENT_UNDEF && match_type != event->state)
604 continue;
605
606 event_queue_delete(event);
607 }
608 }
609
610 static void worker_returned(int fd_worker)
611 {
612 for (;;) {
613 struct worker_message msg;
614 ssize_t size;
615 struct udev_list_node *loop;
616
617 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
618 if (size != sizeof(struct worker_message))
619 break;
620
621 /* lookup worker who sent the signal */
622 udev_list_node_foreach(loop, &worker_list) {
623 struct worker *worker = node_to_worker(loop);
624
625 if (worker->pid != msg.pid)
626 continue;
627
628 /* worker returned */
629 if (worker->event) {
630 worker->event->exitcode = msg.exitcode;
631 event_queue_delete(worker->event);
632 worker->event = NULL;
633 }
634 if (worker->state != WORKER_KILLED)
635 worker->state = WORKER_IDLE;
636 worker_unref(worker);
637 break;
638 }
639 }
640 }
641
642 /* receive the udevd message from userspace */
643 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
644 {
645 struct udev *udev = udev_ctrl_get_udev(uctrl);
646 struct udev_ctrl_connection *ctrl_conn;
647 struct udev_ctrl_msg *ctrl_msg = NULL;
648 const char *str;
649 int i;
650
651 ctrl_conn = udev_ctrl_get_connection(uctrl);
652 if (ctrl_conn == NULL)
653 goto out;
654
655 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
656 if (ctrl_msg == NULL)
657 goto out;
658
659 i = udev_ctrl_get_set_log_level(ctrl_msg);
660 if (i >= 0) {
661 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
662 log_set_max_level(i);
663 udev_set_log_priority(udev, i);
664 worker_kill(udev);
665 }
666
667 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
668 log_debug("udevd message (STOP_EXEC_QUEUE) received");
669 stop_exec_queue = true;
670 }
671
672 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
673 log_debug("udevd message (START_EXEC_QUEUE) received");
674 stop_exec_queue = false;
675 }
676
677 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
678 log_debug("udevd message (RELOAD) received");
679 reload = true;
680 }
681
682 str = udev_ctrl_get_set_env(ctrl_msg);
683 if (str != NULL) {
684 char *key;
685
686 key = strdup(str);
687 if (key != NULL) {
688 char *val;
689
690 val = strchr(key, '=');
691 if (val != NULL) {
692 val[0] = '\0';
693 val = &val[1];
694 if (val[0] == '\0') {
695 log_debug("udevd message (ENV) received, unset '%s'", key);
696 udev_add_property(udev, key, NULL);
697 } else {
698 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
699 udev_add_property(udev, key, val);
700 }
701 } else {
702 log_error("wrong key format '%s'", key);
703 }
704 free(key);
705 }
706 worker_kill(udev);
707 }
708
709 i = udev_ctrl_get_set_children_max(ctrl_msg);
710 if (i >= 0) {
711 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
712 children_max = i;
713 }
714
715 if (udev_ctrl_get_ping(ctrl_msg) > 0)
716 log_debug("udevd message (SYNC) received");
717
718 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
719 log_debug("udevd message (EXIT) received");
720 udev_exit = true;
721 /* keep reference to block the client until we exit */
722 udev_ctrl_connection_ref(ctrl_conn);
723 }
724 out:
725 udev_ctrl_msg_unref(ctrl_msg);
726 return udev_ctrl_connection_unref(ctrl_conn);
727 }
728
729 static int synthesize_change(struct udev_device *dev) {
730 char filename[UTIL_PATH_SIZE];
731 int r;
732
733 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
734 streq_ptr("disk", udev_device_get_devtype(dev)) &&
735 !startswith(udev_device_get_sysname(dev), "dm-")) {
736 bool part_table_read = false;
737 bool has_partitions = false;
738 int fd;
739 struct udev *udev = udev_device_get_udev(dev);
740 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
741 struct udev_list_entry *item;
742
743 /*
744 * Try to re-read the partition table. This only succeeds if
745 * none of the devices is busy. The kernel returns 0 if no
746 * partition table is found, and we will not get an event for
747 * the disk.
748 */
749 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
750 if (fd >= 0) {
751 r = flock(fd, LOCK_EX|LOCK_NB);
752 if (r >= 0)
753 r = ioctl(fd, BLKRRPART, 0);
754
755 close(fd);
756 if (r >= 0)
757 part_table_read = true;
758 }
759
760 /* search for partitions */
761 e = udev_enumerate_new(udev);
762 if (!e)
763 return -ENOMEM;
764
765 r = udev_enumerate_add_match_parent(e, dev);
766 if (r < 0)
767 return r;
768
769 r = udev_enumerate_add_match_subsystem(e, "block");
770 if (r < 0)
771 return r;
772
773 r = udev_enumerate_scan_devices(e);
774 if (r < 0)
775 return r;
776
777 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
778 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
779
780 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
781 if (!d)
782 continue;
783
784 if (!streq_ptr("partition", udev_device_get_devtype(d)))
785 continue;
786
787 has_partitions = true;
788 break;
789 }
790
791 /*
792 * We have partitions and re-read the table, the kernel already sent
793 * out a "change" event for the disk, and "remove/add" for all
794 * partitions.
795 */
796 if (part_table_read && has_partitions)
797 return 0;
798
799 /*
800 * We have partitions but re-reading the partition table did not
801 * work, synthesize "change" for the disk and all partitions.
802 */
803 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
804 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
805 write_string_file(filename, "change");
806
807 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
808 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
809
810 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
811 if (!d)
812 continue;
813
814 if (!streq_ptr("partition", udev_device_get_devtype(d)))
815 continue;
816
817 log_debug("device %s closed, synthesising partition '%s' 'change'",
818 udev_device_get_devnode(dev), udev_device_get_devnode(d));
819 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
820 write_string_file(filename, "change");
821 }
822
823 return 0;
824 }
825
826 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
827 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
828 write_string_file(filename, "change");
829
830 return 0;
831 }
832
833 static int handle_inotify(struct udev *udev)
834 {
835 int nbytes, pos;
836 char *buf;
837 struct inotify_event *ev;
838 int r;
839
840 r = ioctl(fd_inotify, FIONREAD, &nbytes);
841 if (r < 0 || nbytes <= 0)
842 return -errno;
843
844 buf = malloc(nbytes);
845 if (!buf) {
846 log_error("error getting buffer for inotify");
847 return -ENOMEM;
848 }
849
850 nbytes = read(fd_inotify, buf, nbytes);
851
852 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
853 struct udev_device *dev;
854
855 ev = (struct inotify_event *)(buf + pos);
856 dev = udev_watch_lookup(udev, ev->wd);
857 if (!dev)
858 continue;
859
860 log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
861 if (ev->mask & IN_CLOSE_WRITE)
862 synthesize_change(dev);
863 else if (ev->mask & IN_IGNORED)
864 udev_watch_end(udev, dev);
865
866 udev_device_unref(dev);
867 }
868
869 free(buf);
870 return 0;
871 }
872
873 static void handle_signal(struct udev *udev, int signo)
874 {
875 switch (signo) {
876 case SIGINT:
877 case SIGTERM:
878 udev_exit = true;
879 break;
880 case SIGCHLD:
881 for (;;) {
882 pid_t pid;
883 int status;
884 struct udev_list_node *loop, *tmp;
885
886 pid = waitpid(-1, &status, WNOHANG);
887 if (pid <= 0)
888 break;
889
890 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
891 struct worker *worker = node_to_worker(loop);
892
893 if (worker->pid != pid)
894 continue;
895 log_debug("worker [%u] exit", pid);
896
897 if (WIFEXITED(status)) {
898 if (WEXITSTATUS(status) != 0)
899 log_error("worker [%u] exit with return code %i",
900 pid, WEXITSTATUS(status));
901 } else if (WIFSIGNALED(status)) {
902 log_error("worker [%u] terminated by signal %i (%s)",
903 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
904 } else if (WIFSTOPPED(status)) {
905 log_error("worker [%u] stopped", pid);
906 } else if (WIFCONTINUED(status)) {
907 log_error("worker [%u] continued", pid);
908 } else {
909 log_error("worker [%u] exit with status 0x%04x", pid, status);
910 }
911
912 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
913 if (worker->event) {
914 log_error("worker [%u] failed while handling '%s'",
915 pid, worker->event->devpath);
916 worker->event->exitcode = -32;
917 event_queue_delete(worker->event);
918
919 /* drop reference taken for state 'running' */
920 worker_unref(worker);
921 }
922 }
923 worker_unref(worker);
924 break;
925 }
926 }
927 break;
928 case SIGHUP:
929 reload = true;
930 break;
931 }
932 }
933
934 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
935 {
936 int ctrl = -1, netlink = -1;
937 int fd, n;
938
939 n = sd_listen_fds(true);
940 if (n <= 0)
941 return -1;
942
943 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
944 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
945 if (ctrl >= 0)
946 return -1;
947 ctrl = fd;
948 continue;
949 }
950
951 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
952 if (netlink >= 0)
953 return -1;
954 netlink = fd;
955 continue;
956 }
957
958 return -1;
959 }
960
961 if (ctrl < 0 || netlink < 0)
962 return -1;
963
964 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
965 *rctrl = ctrl;
966 *rnetlink = netlink;
967 return 0;
968 }
969
970 /*
971 * read the kernel commandline, in case we need to get into debug mode
972 * udev.log-priority=<level> syslog priority
973 * udev.children-max=<number of workers> events are fully serialized if set to 1
974 * udev.exec-delay=<number of seconds> delay execution of every executed program
975 */
976 static void kernel_cmdline_options(struct udev *udev)
977 {
978 _cleanup_free_ char *line = NULL;
979 char *w, *state;
980 size_t l;
981 int r;
982
983 r = proc_cmdline(&line);
984 if (r < 0)
985 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
986 if (r <= 0)
987 return;
988
989 FOREACH_WORD_QUOTED(w, l, line, state) {
990 char *s, *opt;
991
992 s = strndup(w, l);
993 if (!s)
994 break;
995
996 /* accept the same options for the initrd, prefixed with "rd." */
997 if (in_initrd() && startswith(s, "rd."))
998 opt = s + 3;
999 else
1000 opt = s;
1001
1002 if (startswith(opt, "udev.log-priority=")) {
1003 int prio;
1004
1005 prio = util_log_priority(opt + 18);
1006 log_set_max_level(prio);
1007 udev_set_log_priority(udev, prio);
1008 } else if (startswith(opt, "udev.children-max=")) {
1009 children_max = strtoul(opt + 18, NULL, 0);
1010 } else if (startswith(opt, "udev.exec-delay=")) {
1011 exec_delay = strtoul(opt + 16, NULL, 0);
1012 }
1013
1014 free(s);
1015 }
1016 }
1017
1018 int main(int argc, char *argv[])
1019 {
1020 struct udev *udev;
1021 sigset_t mask;
1022 int daemonize = false;
1023 int resolve_names = 1;
1024 static const struct option options[] = {
1025 { "daemon", no_argument, NULL, 'd' },
1026 { "debug", no_argument, NULL, 'D' },
1027 { "children-max", required_argument, NULL, 'c' },
1028 { "exec-delay", required_argument, NULL, 'e' },
1029 { "resolve-names", required_argument, NULL, 'N' },
1030 { "help", no_argument, NULL, 'h' },
1031 { "version", no_argument, NULL, 'V' },
1032 {}
1033 };
1034 int fd_ctrl = -1;
1035 int fd_netlink = -1;
1036 int fd_worker = -1;
1037 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1038 struct udev_ctrl_connection *ctrl_conn = NULL;
1039 int rc = 1;
1040
1041 udev = udev_new();
1042 if (udev == NULL)
1043 goto exit;
1044
1045 log_set_target(LOG_TARGET_AUTO);
1046 log_parse_environment();
1047 log_open();
1048
1049 udev_set_log_fn(udev, udev_main_log);
1050 log_set_max_level(udev_get_log_priority(udev));
1051
1052 log_debug("version %s", VERSION);
1053 label_init("/dev");
1054
1055 for (;;) {
1056 int option;
1057
1058 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1059 if (option == -1)
1060 break;
1061
1062 switch (option) {
1063 case 'd':
1064 daemonize = true;
1065 break;
1066 case 'c':
1067 children_max = strtoul(optarg, NULL, 0);
1068 break;
1069 case 'e':
1070 exec_delay = strtoul(optarg, NULL, 0);
1071 break;
1072 case 'D':
1073 debug = true;
1074 log_set_max_level(LOG_DEBUG);
1075 udev_set_log_priority(udev, LOG_DEBUG);
1076 break;
1077 case 'N':
1078 if (streq(optarg, "early")) {
1079 resolve_names = 1;
1080 } else if (streq(optarg, "late")) {
1081 resolve_names = 0;
1082 } else if (streq(optarg, "never")) {
1083 resolve_names = -1;
1084 } else {
1085 fprintf(stderr, "resolve-names must be early, late or never\n");
1086 log_error("resolve-names must be early, late or never");
1087 goto exit;
1088 }
1089 break;
1090 case 'h':
1091 printf("Usage: udevd OPTIONS\n"
1092 " --daemon\n"
1093 " --debug\n"
1094 " --children-max=<maximum number of workers>\n"
1095 " --exec-delay=<seconds to wait before executing RUN=>\n"
1096 " --resolve-names=early|late|never\n"
1097 " --version\n"
1098 " --help\n"
1099 "\n");
1100 goto exit;
1101 case 'V':
1102 printf("%s\n", VERSION);
1103 goto exit;
1104 default:
1105 goto exit;
1106 }
1107 }
1108
1109 kernel_cmdline_options(udev);
1110
1111 if (getuid() != 0) {
1112 fprintf(stderr, "root privileges required\n");
1113 log_error("root privileges required");
1114 goto exit;
1115 }
1116
1117 /* set umask before creating any file/directory */
1118 chdir("/");
1119 umask(022);
1120
1121 mkdir("/run/udev", 0755);
1122
1123 dev_setup(NULL);
1124
1125 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1126 if (daemonize) {
1127 int fd;
1128
1129 fd = open("/dev/null", O_RDWR);
1130 if (fd >= 0) {
1131 if (write(STDOUT_FILENO, 0, 0) < 0)
1132 dup2(fd, STDOUT_FILENO);
1133 if (write(STDERR_FILENO, 0, 0) < 0)
1134 dup2(fd, STDERR_FILENO);
1135 if (fd > STDERR_FILENO)
1136 close(fd);
1137 } else {
1138 fprintf(stderr, "cannot open /dev/null\n");
1139 log_error("cannot open /dev/null");
1140 }
1141 }
1142
1143 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1144 /* get control and netlink socket from systemd */
1145 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1146 if (udev_ctrl == NULL) {
1147 log_error("error taking over udev control socket");
1148 rc = 1;
1149 goto exit;
1150 }
1151
1152 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1153 if (monitor == NULL) {
1154 log_error("error taking over netlink socket");
1155 rc = 3;
1156 goto exit;
1157 }
1158
1159 /* get our own cgroup, we regularly kill everything udev has left behind */
1160 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1161 udev_cgroup = NULL;
1162 } else {
1163 /* open control and netlink socket */
1164 udev_ctrl = udev_ctrl_new(udev);
1165 if (udev_ctrl == NULL) {
1166 fprintf(stderr, "error initializing udev control socket");
1167 log_error("error initializing udev control socket");
1168 rc = 1;
1169 goto exit;
1170 }
1171 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1172
1173 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1174 if (monitor == NULL) {
1175 fprintf(stderr, "error initializing netlink socket\n");
1176 log_error("error initializing netlink socket");
1177 rc = 3;
1178 goto exit;
1179 }
1180 fd_netlink = udev_monitor_get_fd(monitor);
1181 }
1182
1183 if (udev_monitor_enable_receiving(monitor) < 0) {
1184 fprintf(stderr, "error binding netlink socket\n");
1185 log_error("error binding netlink socket");
1186 rc = 3;
1187 goto exit;
1188 }
1189
1190 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1191 fprintf(stderr, "error binding udev control socket\n");
1192 log_error("error binding udev control socket");
1193 rc = 1;
1194 goto exit;
1195 }
1196
1197 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1198
1199 if (daemonize) {
1200 pid_t pid;
1201
1202 pid = fork();
1203 switch (pid) {
1204 case 0:
1205 break;
1206 case -1:
1207 log_error("fork of daemon failed: %m");
1208 rc = 4;
1209 goto exit;
1210 default:
1211 rc = EXIT_SUCCESS;
1212 goto exit_daemonize;
1213 }
1214
1215 setsid();
1216
1217 write_string_file("/proc/self/oom_score_adj", "-1000");
1218 } else {
1219 sd_notify(1, "READY=1");
1220 }
1221
1222 print_kmsg("starting version " VERSION "\n");
1223
1224 if (!debug) {
1225 int fd;
1226
1227 fd = open("/dev/null", O_RDWR);
1228 if (fd >= 0) {
1229 dup2(fd, STDIN_FILENO);
1230 dup2(fd, STDOUT_FILENO);
1231 dup2(fd, STDERR_FILENO);
1232 close(fd);
1233 }
1234 }
1235
1236 fd_inotify = udev_watch_init(udev);
1237 if (fd_inotify < 0) {
1238 fprintf(stderr, "error initializing inotify\n");
1239 log_error("error initializing inotify");
1240 rc = 4;
1241 goto exit;
1242 }
1243 udev_watch_restore(udev);
1244
1245 /* block and listen to all signals on signalfd */
1246 sigfillset(&mask);
1247 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1248 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1249 if (fd_signal < 0) {
1250 fprintf(stderr, "error creating signalfd\n");
1251 log_error("error creating signalfd");
1252 rc = 5;
1253 goto exit;
1254 }
1255
1256 /* unnamed socket from workers to the main daemon */
1257 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1258 fprintf(stderr, "error creating socketpair\n");
1259 log_error("error creating socketpair");
1260 rc = 6;
1261 goto exit;
1262 }
1263 fd_worker = worker_watch[READ_END];
1264
1265 udev_builtin_init(udev);
1266
1267 rules = udev_rules_new(udev, resolve_names);
1268 if (rules == NULL) {
1269 log_error("error reading rules");
1270 goto exit;
1271 }
1272
1273 memzero(&ep_ctrl, sizeof(struct epoll_event));
1274 ep_ctrl.events = EPOLLIN;
1275 ep_ctrl.data.fd = fd_ctrl;
1276
1277 memzero(&ep_inotify, sizeof(struct epoll_event));
1278 ep_inotify.events = EPOLLIN;
1279 ep_inotify.data.fd = fd_inotify;
1280
1281 memzero(&ep_signal, sizeof(struct epoll_event));
1282 ep_signal.events = EPOLLIN;
1283 ep_signal.data.fd = fd_signal;
1284
1285 memzero(&ep_netlink, sizeof(struct epoll_event));
1286 ep_netlink.events = EPOLLIN;
1287 ep_netlink.data.fd = fd_netlink;
1288
1289 memzero(&ep_worker, sizeof(struct epoll_event));
1290 ep_worker.events = EPOLLIN;
1291 ep_worker.data.fd = fd_worker;
1292
1293 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1294 if (fd_ep < 0) {
1295 log_error("error creating epoll fd: %m");
1296 goto exit;
1297 }
1298 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1299 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1300 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1301 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1302 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1303 log_error("fail to add fds to epoll: %m");
1304 goto exit;
1305 }
1306
1307 if (children_max <= 0) {
1308 cpu_set_t cpu_set;
1309
1310 children_max = 8;
1311
1312 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1313 children_max += CPU_COUNT(&cpu_set) * 2;
1314 }
1315 }
1316 log_debug("set children_max to %u", children_max);
1317
1318 rc = udev_rules_apply_static_dev_perms(rules);
1319 if (rc < 0)
1320 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1321
1322 udev_list_node_init(&event_list);
1323 udev_list_node_init(&worker_list);
1324
1325 for (;;) {
1326 static usec_t last_usec;
1327 struct epoll_event ev[8];
1328 int fdcount;
1329 int timeout;
1330 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1331 int i;
1332
1333 if (udev_exit) {
1334 /* close sources of new events and discard buffered events */
1335 if (fd_ctrl >= 0) {
1336 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1337 fd_ctrl = -1;
1338 }
1339 if (monitor != NULL) {
1340 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1341 udev_monitor_unref(monitor);
1342 monitor = NULL;
1343 }
1344 if (fd_inotify >= 0) {
1345 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1346 close(fd_inotify);
1347 fd_inotify = -1;
1348 }
1349
1350 /* discard queued events and kill workers */
1351 event_queue_cleanup(udev, EVENT_QUEUED);
1352 worker_kill(udev);
1353
1354 /* exit after all has cleaned up */
1355 if (udev_list_node_is_empty(&event_list) && children == 0)
1356 break;
1357
1358 /* timeout at exit for workers to finish */
1359 timeout = 30 * MSEC_PER_SEC;
1360 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1361 /* we are idle */
1362 timeout = -1;
1363
1364 /* cleanup possible left-over processes in our cgroup */
1365 if (udev_cgroup)
1366 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1367 } else {
1368 /* kill idle or hanging workers */
1369 timeout = 3 * MSEC_PER_SEC;
1370 }
1371
1372 /* tell settle that we are busy or idle */
1373 if (!udev_list_node_is_empty(&event_list)) {
1374 int fd;
1375
1376 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1377 if (fd >= 0)
1378 close(fd);
1379 } else {
1380 unlink("/run/udev/queue");
1381 }
1382
1383 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1384 if (fdcount < 0)
1385 continue;
1386
1387 if (fdcount == 0) {
1388 struct udev_list_node *loop;
1389
1390 /* timeout */
1391 if (udev_exit) {
1392 log_error("timeout, giving up waiting for workers to finish");
1393 break;
1394 }
1395
1396 /* kill idle workers */
1397 if (udev_list_node_is_empty(&event_list)) {
1398 log_debug("cleanup idle workers");
1399 worker_kill(udev);
1400 }
1401
1402 /* check for hanging events */
1403 udev_list_node_foreach(loop, &worker_list) {
1404 struct worker *worker = node_to_worker(loop);
1405
1406 if (worker->state != WORKER_RUNNING)
1407 continue;
1408
1409 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * USEC_PER_SEC) {
1410 log_error("worker [%u] %s timeout; kill it", worker->pid,
1411 worker->event ? worker->event->devpath : "<idle>");
1412 kill(worker->pid, SIGKILL);
1413 worker->state = WORKER_KILLED;
1414
1415 /* drop reference taken for state 'running' */
1416 worker_unref(worker);
1417 if (worker->event) {
1418 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1419 worker->event->exitcode = -64;
1420 event_queue_delete(worker->event);
1421 worker->event = NULL;
1422 }
1423 }
1424 }
1425
1426 }
1427
1428 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1429 for (i = 0; i < fdcount; i++) {
1430 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1431 is_worker = true;
1432 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1433 is_netlink = true;
1434 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1435 is_signal = true;
1436 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1437 is_inotify = true;
1438 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1439 is_ctrl = true;
1440 }
1441
1442 /* check for changed config, every 3 seconds at most */
1443 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1444 if (udev_rules_check_timestamp(rules))
1445 reload = true;
1446 if (udev_builtin_validate(udev))
1447 reload = true;
1448
1449 last_usec = now(CLOCK_MONOTONIC);
1450 }
1451
1452 /* reload requested, HUP signal received, rules changed, builtin changed */
1453 if (reload) {
1454 worker_kill(udev);
1455 rules = udev_rules_unref(rules);
1456 udev_builtin_exit(udev);
1457 reload = false;
1458 }
1459
1460 /* event has finished */
1461 if (is_worker)
1462 worker_returned(fd_worker);
1463
1464 if (is_netlink) {
1465 struct udev_device *dev;
1466
1467 dev = udev_monitor_receive_device(monitor);
1468 if (dev != NULL) {
1469 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1470 if (event_queue_insert(dev) < 0)
1471 udev_device_unref(dev);
1472 }
1473 }
1474
1475 /* start new events */
1476 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1477 udev_builtin_init(udev);
1478 if (rules == NULL)
1479 rules = udev_rules_new(udev, resolve_names);
1480 if (rules != NULL)
1481 event_queue_start(udev);
1482 }
1483
1484 if (is_signal) {
1485 struct signalfd_siginfo fdsi;
1486 ssize_t size;
1487
1488 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1489 if (size == sizeof(struct signalfd_siginfo))
1490 handle_signal(udev, fdsi.ssi_signo);
1491 }
1492
1493 /* we are shutting down, the events below are not handled anymore */
1494 if (udev_exit)
1495 continue;
1496
1497 /* device node watch */
1498 if (is_inotify)
1499 handle_inotify(udev);
1500
1501 /*
1502 * This needs to be after the inotify handling, to make sure,
1503 * that the ping is send back after the possibly generated
1504 * "change" events by the inotify device node watch.
1505 *
1506 * A single time we may receive a client connection which we need to
1507 * keep open to block the client. It will be closed right before we
1508 * exit.
1509 */
1510 if (is_ctrl)
1511 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1512 }
1513
1514 rc = EXIT_SUCCESS;
1515 exit:
1516 udev_ctrl_cleanup(udev_ctrl);
1517 unlink("/run/udev/queue");
1518 exit_daemonize:
1519 if (fd_ep >= 0)
1520 close(fd_ep);
1521 worker_list_cleanup(udev);
1522 event_queue_cleanup(udev, EVENT_UNDEF);
1523 udev_rules_unref(rules);
1524 udev_builtin_exit(udev);
1525 if (fd_signal >= 0)
1526 close(fd_signal);
1527 if (worker_watch[READ_END] >= 0)
1528 close(worker_watch[READ_END]);
1529 if (worker_watch[WRITE_END] >= 0)
1530 close(worker_watch[WRITE_END]);
1531 udev_monitor_unref(monitor);
1532 udev_ctrl_connection_unref(ctrl_conn);
1533 udev_ctrl_unref(udev_ctrl);
1534 label_finish();
1535 udev_unref(udev);
1536 log_close();
1537 return rc;
1538 }
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