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udev: guard REREADPT by exclusive lock instead of O_EXCL
[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 "read lock" on the device node; this establishes
289 * a concept of device "ownership" to serialize device
290 * access. External processes holding a "write lock" will
291 * cause udev to skip the event handling; in the case udev
292 * acquired the lock, the external process will block until
293 * udev has finished its event handling.
294 */
295
296 /*
297 * <kabi_> since we make check - device seems unused - we try
298 * ioctl to deactivate - and device is found to be opened
299 * <kay> sure, you try to take a write lock
300 * <kay> if you get it udev is out
301 * <kay> if you can't get it, udev is busy
302 * <kabi_> we cannot deactivate openned device (as it is in-use)
303 * <kay> maybe we should just exclude dm from that thing entirely
304 * <kabi_> IMHO this sounds like a good plan for this moment
305 */
306 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
307 !startswith("dm-", udev_device_get_sysname(dev))) {
308 struct udev_device *d = dev;
309
310 if (streq_ptr("partition", udev_device_get_devtype(d)))
311 d = udev_device_get_parent(d);
312
313 if (d) {
314 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
315 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
316 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
317 err = -EWOULDBLOCK;
318 fd_lock = safe_close(fd_lock);
319 goto skip;
320 }
321 }
322 }
323
324 /* apply rules, create node, symlinks */
325 udev_event_execute_rules(udev_event, rules, &sigmask_orig);
326
327 udev_event_execute_run(udev_event, &sigmask_orig);
328
329 /* apply/restore inotify watch */
330 if (udev_event->inotify_watch) {
331 udev_watch_begin(udev, dev);
332 udev_device_update_db(dev);
333 }
334
335 safe_close(fd_lock);
336
337 /* send processed event back to libudev listeners */
338 udev_monitor_send_device(worker_monitor, NULL, dev);
339
340 skip:
341 /* send udevd the result of the event execution */
342 memzero(&msg, sizeof(struct worker_message));
343 msg.exitcode = err;
344 msg.pid = getpid();
345 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
346
347 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
348
349 udev_device_unref(dev);
350 dev = NULL;
351
352 if (udev_event->sigterm) {
353 udev_event_unref(udev_event);
354 goto out;
355 }
356
357 udev_event_unref(udev_event);
358
359 /* wait for more device messages from main udevd, or term signal */
360 while (dev == NULL) {
361 struct epoll_event ev[4];
362 int fdcount;
363 int i;
364
365 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
366 if (fdcount < 0) {
367 if (errno == EINTR)
368 continue;
369 log_error("failed to poll: %m");
370 goto out;
371 }
372
373 for (i = 0; i < fdcount; i++) {
374 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
375 dev = udev_monitor_receive_device(worker_monitor);
376 break;
377 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
378 struct signalfd_siginfo fdsi;
379 ssize_t size;
380
381 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
382 if (size != sizeof(struct signalfd_siginfo))
383 continue;
384 switch (fdsi.ssi_signo) {
385 case SIGTERM:
386 goto out;
387 }
388 }
389 }
390 }
391 }
392 out:
393 udev_device_unref(dev);
394 safe_close(fd_signal);
395 safe_close(fd_ep);
396 close(fd_inotify);
397 close(worker_watch[WRITE_END]);
398 udev_rules_unref(rules);
399 udev_builtin_exit(udev);
400 udev_monitor_unref(worker_monitor);
401 udev_unref(udev);
402 log_close();
403 exit(rc);
404 }
405 case -1:
406 udev_monitor_unref(worker_monitor);
407 event->state = EVENT_QUEUED;
408 free(worker);
409 log_error("fork of child failed: %m");
410 break;
411 default:
412 /* close monitor, but keep address around */
413 udev_monitor_disconnect(worker_monitor);
414 worker->monitor = worker_monitor;
415 worker->pid = pid;
416 worker->state = WORKER_RUNNING;
417 worker->event_start_usec = now(CLOCK_MONOTONIC);
418 worker->event = event;
419 event->state = EVENT_RUNNING;
420 udev_list_node_append(&worker->node, &worker_list);
421 children++;
422 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
423 break;
424 }
425 }
426
427 static void event_run(struct event *event)
428 {
429 struct udev_list_node *loop;
430
431 udev_list_node_foreach(loop, &worker_list) {
432 struct worker *worker = node_to_worker(loop);
433 ssize_t count;
434
435 if (worker->state != WORKER_IDLE)
436 continue;
437
438 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
439 if (count < 0) {
440 log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
441 kill(worker->pid, SIGKILL);
442 worker->state = WORKER_KILLED;
443 continue;
444 }
445 worker_ref(worker);
446 worker->event = event;
447 worker->state = WORKER_RUNNING;
448 worker->event_start_usec = now(CLOCK_MONOTONIC);
449 event->state = EVENT_RUNNING;
450 return;
451 }
452
453 if (children >= children_max) {
454 if (children_max > 1)
455 log_debug("maximum number (%i) of children reached", children);
456 return;
457 }
458
459 /* start new worker and pass initial device */
460 worker_new(event);
461 }
462
463 static int event_queue_insert(struct udev_device *dev)
464 {
465 struct event *event;
466
467 event = new0(struct event, 1);
468 if (event == NULL)
469 return -1;
470
471 event->udev = udev_device_get_udev(dev);
472 event->dev = dev;
473 event->seqnum = udev_device_get_seqnum(dev);
474 event->devpath = udev_device_get_devpath(dev);
475 event->devpath_len = strlen(event->devpath);
476 event->devpath_old = udev_device_get_devpath_old(dev);
477 event->devnum = udev_device_get_devnum(dev);
478 event->is_block = streq("block", udev_device_get_subsystem(dev));
479 event->ifindex = udev_device_get_ifindex(dev);
480 #ifdef HAVE_FIRMWARE
481 if (streq(udev_device_get_subsystem(dev), "firmware"))
482 event->nodelay = true;
483 #endif
484
485 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
486 udev_device_get_action(dev), udev_device_get_subsystem(dev));
487
488 event->state = EVENT_QUEUED;
489 udev_list_node_append(&event->node, &event_list);
490 return 0;
491 }
492
493 static void worker_kill(struct udev *udev)
494 {
495 struct udev_list_node *loop;
496
497 udev_list_node_foreach(loop, &worker_list) {
498 struct worker *worker = node_to_worker(loop);
499
500 if (worker->state == WORKER_KILLED)
501 continue;
502
503 worker->state = WORKER_KILLED;
504 kill(worker->pid, SIGTERM);
505 }
506 }
507
508 /* lookup event for identical, parent, child device */
509 static bool is_devpath_busy(struct event *event)
510 {
511 struct udev_list_node *loop;
512 size_t common;
513
514 /* check if queue contains events we depend on */
515 udev_list_node_foreach(loop, &event_list) {
516 struct event *loop_event = node_to_event(loop);
517
518 /* we already found a later event, earlier can not block us, no need to check again */
519 if (loop_event->seqnum < event->delaying_seqnum)
520 continue;
521
522 /* event we checked earlier still exists, no need to check again */
523 if (loop_event->seqnum == event->delaying_seqnum)
524 return true;
525
526 /* found ourself, no later event can block us */
527 if (loop_event->seqnum >= event->seqnum)
528 break;
529
530 /* check major/minor */
531 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
532 return true;
533
534 /* check network device ifindex */
535 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
536 return true;
537
538 /* check our old name */
539 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
540 event->delaying_seqnum = loop_event->seqnum;
541 return true;
542 }
543
544 /* compare devpath */
545 common = MIN(loop_event->devpath_len, event->devpath_len);
546
547 /* one devpath is contained in the other? */
548 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
549 continue;
550
551 /* identical device event found */
552 if (loop_event->devpath_len == event->devpath_len) {
553 /* devices names might have changed/swapped in the meantime */
554 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
555 continue;
556 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
557 continue;
558 event->delaying_seqnum = loop_event->seqnum;
559 return true;
560 }
561
562 #ifdef HAVE_FIRMWARE
563 /* allow to bypass the dependency tracking */
564 if (event->nodelay)
565 continue;
566 #endif
567
568 /* parent device event found */
569 if (event->devpath[common] == '/') {
570 event->delaying_seqnum = loop_event->seqnum;
571 return true;
572 }
573
574 /* child device event found */
575 if (loop_event->devpath[common] == '/') {
576 event->delaying_seqnum = loop_event->seqnum;
577 return true;
578 }
579
580 /* no matching device */
581 continue;
582 }
583
584 return false;
585 }
586
587 static void event_queue_start(struct udev *udev)
588 {
589 struct udev_list_node *loop;
590
591 udev_list_node_foreach(loop, &event_list) {
592 struct event *event = node_to_event(loop);
593
594 if (event->state != EVENT_QUEUED)
595 continue;
596
597 /* do not start event if parent or child event is still running */
598 if (is_devpath_busy(event))
599 continue;
600
601 event_run(event);
602 }
603 }
604
605 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
606 {
607 struct udev_list_node *loop, *tmp;
608
609 udev_list_node_foreach_safe(loop, tmp, &event_list) {
610 struct event *event = node_to_event(loop);
611
612 if (match_type != EVENT_UNDEF && match_type != event->state)
613 continue;
614
615 event_queue_delete(event);
616 }
617 }
618
619 static void worker_returned(int fd_worker)
620 {
621 for (;;) {
622 struct worker_message msg;
623 ssize_t size;
624 struct udev_list_node *loop;
625
626 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
627 if (size != sizeof(struct worker_message))
628 break;
629
630 /* lookup worker who sent the signal */
631 udev_list_node_foreach(loop, &worker_list) {
632 struct worker *worker = node_to_worker(loop);
633
634 if (worker->pid != msg.pid)
635 continue;
636
637 /* worker returned */
638 if (worker->event) {
639 worker->event->exitcode = msg.exitcode;
640 event_queue_delete(worker->event);
641 worker->event = NULL;
642 }
643 if (worker->state != WORKER_KILLED)
644 worker->state = WORKER_IDLE;
645 worker_unref(worker);
646 break;
647 }
648 }
649 }
650
651 /* receive the udevd message from userspace */
652 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
653 {
654 struct udev *udev = udev_ctrl_get_udev(uctrl);
655 struct udev_ctrl_connection *ctrl_conn;
656 struct udev_ctrl_msg *ctrl_msg = NULL;
657 const char *str;
658 int i;
659
660 ctrl_conn = udev_ctrl_get_connection(uctrl);
661 if (ctrl_conn == NULL)
662 goto out;
663
664 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
665 if (ctrl_msg == NULL)
666 goto out;
667
668 i = udev_ctrl_get_set_log_level(ctrl_msg);
669 if (i >= 0) {
670 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
671 log_set_max_level(i);
672 udev_set_log_priority(udev, i);
673 worker_kill(udev);
674 }
675
676 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
677 log_debug("udevd message (STOP_EXEC_QUEUE) received");
678 stop_exec_queue = true;
679 }
680
681 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
682 log_debug("udevd message (START_EXEC_QUEUE) received");
683 stop_exec_queue = false;
684 }
685
686 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
687 log_debug("udevd message (RELOAD) received");
688 reload = true;
689 }
690
691 str = udev_ctrl_get_set_env(ctrl_msg);
692 if (str != NULL) {
693 char *key;
694
695 key = strdup(str);
696 if (key != NULL) {
697 char *val;
698
699 val = strchr(key, '=');
700 if (val != NULL) {
701 val[0] = '\0';
702 val = &val[1];
703 if (val[0] == '\0') {
704 log_debug("udevd message (ENV) received, unset '%s'", key);
705 udev_add_property(udev, key, NULL);
706 } else {
707 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
708 udev_add_property(udev, key, val);
709 }
710 } else {
711 log_error("wrong key format '%s'", key);
712 }
713 free(key);
714 }
715 worker_kill(udev);
716 }
717
718 i = udev_ctrl_get_set_children_max(ctrl_msg);
719 if (i >= 0) {
720 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
721 children_max = i;
722 }
723
724 if (udev_ctrl_get_ping(ctrl_msg) > 0)
725 log_debug("udevd message (SYNC) received");
726
727 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
728 log_debug("udevd message (EXIT) received");
729 udev_exit = true;
730 /* keep reference to block the client until we exit */
731 udev_ctrl_connection_ref(ctrl_conn);
732 }
733 out:
734 udev_ctrl_msg_unref(ctrl_msg);
735 return udev_ctrl_connection_unref(ctrl_conn);
736 }
737
738 static int synthesize_change(struct udev_device *dev) {
739 char filename[UTIL_PATH_SIZE];
740 int r;
741
742 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
743 streq_ptr("disk", udev_device_get_devtype(dev)) &&
744 !startswith("dm-", udev_device_get_sysname(dev))) {
745 bool part_table_read = false;
746 bool has_partitions = false;
747 int fd;
748 struct udev *udev = udev_device_get_udev(dev);
749 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
750 struct udev_list_entry *item;
751
752 /*
753 * Try to re-read the partition table. This only succeeds if
754 * none of the devices is busy. The kernel returns 0 if no
755 * partition table is found, and we will not get an event for
756 * the disk.
757 */
758 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
759 if (fd >= 0) {
760 r = flock(fd, LOCK_EX|LOCK_NB);
761 if (r >= 0)
762 r = ioctl(fd, BLKRRPART, 0);
763
764 close(fd);
765 if (r >= 0)
766 part_table_read = true;
767 }
768
769 /* search for partitions */
770 e = udev_enumerate_new(udev);
771 if (!e)
772 return -ENOMEM;
773
774 r = udev_enumerate_add_match_parent(e, dev);
775 if (r < 0)
776 return r;
777
778 r = udev_enumerate_add_match_subsystem(e, "block");
779 if (r < 0)
780 return r;
781
782 r = udev_enumerate_scan_devices(e);
783
784 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
785 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
786
787 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
788 if (!d)
789 continue;
790
791 if (!streq_ptr("partition", udev_device_get_devtype(d)))
792 continue;
793
794 has_partitions = true;
795 break;
796 }
797
798 /*
799 * We have partitions and re-read the table, the kernel already sent
800 * out a "change" event for the disk, and "remove/add" for all
801 * partitions.
802 */
803 if (part_table_read && has_partitions)
804 return 0;
805
806 /*
807 * We have partitions but re-reading the partition table did not
808 * work, synthesize "change" for the disk and all partitions.
809 */
810 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
811 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
812 write_string_file(filename, "change");
813
814 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
815 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
816
817 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
818 if (!d)
819 continue;
820
821 if (!streq_ptr("partition", udev_device_get_devtype(d)))
822 continue;
823
824 log_debug("device %s closed, synthesising partition '%s' 'change'",
825 udev_device_get_devnode(dev), udev_device_get_devnode(d));
826 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
827 write_string_file(filename, "change");
828 }
829
830 return 0;
831 }
832
833 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
834 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
835 write_string_file(filename, "change");
836
837 return 0;
838 }
839
840 static int handle_inotify(struct udev *udev)
841 {
842 int nbytes, pos;
843 char *buf;
844 struct inotify_event *ev;
845 int r;
846
847 r = ioctl(fd_inotify, FIONREAD, &nbytes);
848 if (r < 0 || nbytes <= 0)
849 return -errno;
850
851 buf = malloc(nbytes);
852 if (!buf) {
853 log_error("error getting buffer for inotify");
854 return -ENOMEM;
855 }
856
857 nbytes = read(fd_inotify, buf, nbytes);
858
859 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
860 struct udev_device *dev;
861
862 ev = (struct inotify_event *)(buf + pos);
863 dev = udev_watch_lookup(udev, ev->wd);
864 if (!dev)
865 continue;
866
867 log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
868 if (ev->mask & IN_CLOSE_WRITE)
869 synthesize_change(dev);
870 else if (ev->mask & IN_IGNORED)
871 udev_watch_end(udev, dev);
872
873 udev_device_unref(dev);
874 }
875
876 free(buf);
877 return 0;
878 }
879
880 static void handle_signal(struct udev *udev, int signo)
881 {
882 switch (signo) {
883 case SIGINT:
884 case SIGTERM:
885 udev_exit = true;
886 break;
887 case SIGCHLD:
888 for (;;) {
889 pid_t pid;
890 int status;
891 struct udev_list_node *loop, *tmp;
892
893 pid = waitpid(-1, &status, WNOHANG);
894 if (pid <= 0)
895 break;
896
897 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
898 struct worker *worker = node_to_worker(loop);
899
900 if (worker->pid != pid)
901 continue;
902 log_debug("worker [%u] exit", pid);
903
904 if (WIFEXITED(status)) {
905 if (WEXITSTATUS(status) != 0)
906 log_error("worker [%u] exit with return code %i",
907 pid, WEXITSTATUS(status));
908 } else if (WIFSIGNALED(status)) {
909 log_error("worker [%u] terminated by signal %i (%s)",
910 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
911 } else if (WIFSTOPPED(status)) {
912 log_error("worker [%u] stopped", pid);
913 } else if (WIFCONTINUED(status)) {
914 log_error("worker [%u] continued", pid);
915 } else {
916 log_error("worker [%u] exit with status 0x%04x", pid, status);
917 }
918
919 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
920 if (worker->event) {
921 log_error("worker [%u] failed while handling '%s'",
922 pid, worker->event->devpath);
923 worker->event->exitcode = -32;
924 event_queue_delete(worker->event);
925
926 /* drop reference taken for state 'running' */
927 worker_unref(worker);
928 }
929 }
930 worker_unref(worker);
931 break;
932 }
933 }
934 break;
935 case SIGHUP:
936 reload = true;
937 break;
938 }
939 }
940
941 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
942 {
943 int ctrl = -1, netlink = -1;
944 int fd, n;
945
946 n = sd_listen_fds(true);
947 if (n <= 0)
948 return -1;
949
950 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
951 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
952 if (ctrl >= 0)
953 return -1;
954 ctrl = fd;
955 continue;
956 }
957
958 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
959 if (netlink >= 0)
960 return -1;
961 netlink = fd;
962 continue;
963 }
964
965 return -1;
966 }
967
968 if (ctrl < 0 || netlink < 0)
969 return -1;
970
971 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
972 *rctrl = ctrl;
973 *rnetlink = netlink;
974 return 0;
975 }
976
977 /*
978 * read the kernel commandline, in case we need to get into debug mode
979 * udev.log-priority=<level> syslog priority
980 * udev.children-max=<number of workers> events are fully serialized if set to 1
981 * udev.exec-delay=<number of seconds> delay execution of every executed program
982 */
983 static void kernel_cmdline_options(struct udev *udev)
984 {
985 _cleanup_free_ char *line = NULL;
986 char *w, *state;
987 size_t l;
988 int r;
989
990 r = proc_cmdline(&line);
991 if (r < 0)
992 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
993 if (r <= 0)
994 return;
995
996 FOREACH_WORD_QUOTED(w, l, line, state) {
997 char *s, *opt;
998
999 s = strndup(w, l);
1000 if (!s)
1001 break;
1002
1003 /* accept the same options for the initrd, prefixed with "rd." */
1004 if (in_initrd() && startswith(s, "rd."))
1005 opt = s + 3;
1006 else
1007 opt = s;
1008
1009 if (startswith(opt, "udev.log-priority=")) {
1010 int prio;
1011
1012 prio = util_log_priority(opt + 18);
1013 log_set_max_level(prio);
1014 udev_set_log_priority(udev, prio);
1015 } else if (startswith(opt, "udev.children-max=")) {
1016 children_max = strtoul(opt + 18, NULL, 0);
1017 } else if (startswith(opt, "udev.exec-delay=")) {
1018 exec_delay = strtoul(opt + 16, NULL, 0);
1019 }
1020
1021 free(s);
1022 }
1023 }
1024
1025 int main(int argc, char *argv[])
1026 {
1027 struct udev *udev;
1028 sigset_t mask;
1029 int daemonize = false;
1030 int resolve_names = 1;
1031 static const struct option options[] = {
1032 { "daemon", no_argument, NULL, 'd' },
1033 { "debug", no_argument, NULL, 'D' },
1034 { "children-max", required_argument, NULL, 'c' },
1035 { "exec-delay", required_argument, NULL, 'e' },
1036 { "resolve-names", required_argument, NULL, 'N' },
1037 { "help", no_argument, NULL, 'h' },
1038 { "version", no_argument, NULL, 'V' },
1039 {}
1040 };
1041 int fd_ctrl = -1;
1042 int fd_netlink = -1;
1043 int fd_worker = -1;
1044 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1045 struct udev_ctrl_connection *ctrl_conn = NULL;
1046 int rc = 1;
1047
1048 udev = udev_new();
1049 if (udev == NULL)
1050 goto exit;
1051
1052 log_set_target(LOG_TARGET_AUTO);
1053 log_parse_environment();
1054 log_open();
1055
1056 udev_set_log_fn(udev, udev_main_log);
1057 log_set_max_level(udev_get_log_priority(udev));
1058
1059 log_debug("version %s", VERSION);
1060 label_init("/dev");
1061
1062 for (;;) {
1063 int option;
1064
1065 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1066 if (option == -1)
1067 break;
1068
1069 switch (option) {
1070 case 'd':
1071 daemonize = true;
1072 break;
1073 case 'c':
1074 children_max = strtoul(optarg, NULL, 0);
1075 break;
1076 case 'e':
1077 exec_delay = strtoul(optarg, NULL, 0);
1078 break;
1079 case 'D':
1080 debug = true;
1081 log_set_max_level(LOG_DEBUG);
1082 udev_set_log_priority(udev, LOG_DEBUG);
1083 break;
1084 case 'N':
1085 if (streq(optarg, "early")) {
1086 resolve_names = 1;
1087 } else if (streq(optarg, "late")) {
1088 resolve_names = 0;
1089 } else if (streq(optarg, "never")) {
1090 resolve_names = -1;
1091 } else {
1092 fprintf(stderr, "resolve-names must be early, late or never\n");
1093 log_error("resolve-names must be early, late or never");
1094 goto exit;
1095 }
1096 break;
1097 case 'h':
1098 printf("Usage: udevd OPTIONS\n"
1099 " --daemon\n"
1100 " --debug\n"
1101 " --children-max=<maximum number of workers>\n"
1102 " --exec-delay=<seconds to wait before executing RUN=>\n"
1103 " --resolve-names=early|late|never\n"
1104 " --version\n"
1105 " --help\n"
1106 "\n");
1107 goto exit;
1108 case 'V':
1109 printf("%s\n", VERSION);
1110 goto exit;
1111 default:
1112 goto exit;
1113 }
1114 }
1115
1116 kernel_cmdline_options(udev);
1117
1118 if (getuid() != 0) {
1119 fprintf(stderr, "root privileges required\n");
1120 log_error("root privileges required");
1121 goto exit;
1122 }
1123
1124 /* set umask before creating any file/directory */
1125 chdir("/");
1126 umask(022);
1127
1128 mkdir("/run/udev", 0755);
1129
1130 dev_setup(NULL);
1131
1132 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1133 if (daemonize) {
1134 int fd;
1135
1136 fd = open("/dev/null", O_RDWR);
1137 if (fd >= 0) {
1138 if (write(STDOUT_FILENO, 0, 0) < 0)
1139 dup2(fd, STDOUT_FILENO);
1140 if (write(STDERR_FILENO, 0, 0) < 0)
1141 dup2(fd, STDERR_FILENO);
1142 if (fd > STDERR_FILENO)
1143 close(fd);
1144 } else {
1145 fprintf(stderr, "cannot open /dev/null\n");
1146 log_error("cannot open /dev/null");
1147 }
1148 }
1149
1150 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1151 /* get control and netlink socket from systemd */
1152 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1153 if (udev_ctrl == NULL) {
1154 log_error("error taking over udev control socket");
1155 rc = 1;
1156 goto exit;
1157 }
1158
1159 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1160 if (monitor == NULL) {
1161 log_error("error taking over netlink socket");
1162 rc = 3;
1163 goto exit;
1164 }
1165
1166 /* get our own cgroup, we regularly kill everything udev has left behind */
1167 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1168 udev_cgroup = NULL;
1169 } else {
1170 /* open control and netlink socket */
1171 udev_ctrl = udev_ctrl_new(udev);
1172 if (udev_ctrl == NULL) {
1173 fprintf(stderr, "error initializing udev control socket");
1174 log_error("error initializing udev control socket");
1175 rc = 1;
1176 goto exit;
1177 }
1178 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1179
1180 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1181 if (monitor == NULL) {
1182 fprintf(stderr, "error initializing netlink socket\n");
1183 log_error("error initializing netlink socket");
1184 rc = 3;
1185 goto exit;
1186 }
1187 fd_netlink = udev_monitor_get_fd(monitor);
1188 }
1189
1190 if (udev_monitor_enable_receiving(monitor) < 0) {
1191 fprintf(stderr, "error binding netlink socket\n");
1192 log_error("error binding netlink socket");
1193 rc = 3;
1194 goto exit;
1195 }
1196
1197 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1198 fprintf(stderr, "error binding udev control socket\n");
1199 log_error("error binding udev control socket");
1200 rc = 1;
1201 goto exit;
1202 }
1203
1204 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1205
1206 if (daemonize) {
1207 pid_t pid;
1208
1209 pid = fork();
1210 switch (pid) {
1211 case 0:
1212 break;
1213 case -1:
1214 log_error("fork of daemon failed: %m");
1215 rc = 4;
1216 goto exit;
1217 default:
1218 rc = EXIT_SUCCESS;
1219 goto exit_daemonize;
1220 }
1221
1222 setsid();
1223
1224 write_string_file("/proc/self/oom_score_adj", "-1000");
1225 } else {
1226 sd_notify(1, "READY=1");
1227 }
1228
1229 print_kmsg("starting version " VERSION "\n");
1230
1231 if (!debug) {
1232 int fd;
1233
1234 fd = open("/dev/null", O_RDWR);
1235 if (fd >= 0) {
1236 dup2(fd, STDIN_FILENO);
1237 dup2(fd, STDOUT_FILENO);
1238 dup2(fd, STDERR_FILENO);
1239 close(fd);
1240 }
1241 }
1242
1243 fd_inotify = udev_watch_init(udev);
1244 if (fd_inotify < 0) {
1245 fprintf(stderr, "error initializing inotify\n");
1246 log_error("error initializing inotify");
1247 rc = 4;
1248 goto exit;
1249 }
1250 udev_watch_restore(udev);
1251
1252 /* block and listen to all signals on signalfd */
1253 sigfillset(&mask);
1254 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1255 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1256 if (fd_signal < 0) {
1257 fprintf(stderr, "error creating signalfd\n");
1258 log_error("error creating signalfd");
1259 rc = 5;
1260 goto exit;
1261 }
1262
1263 /* unnamed socket from workers to the main daemon */
1264 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1265 fprintf(stderr, "error creating socketpair\n");
1266 log_error("error creating socketpair");
1267 rc = 6;
1268 goto exit;
1269 }
1270 fd_worker = worker_watch[READ_END];
1271
1272 udev_builtin_init(udev);
1273
1274 rules = udev_rules_new(udev, resolve_names);
1275 if (rules == NULL) {
1276 log_error("error reading rules");
1277 goto exit;
1278 }
1279
1280 memzero(&ep_ctrl, sizeof(struct epoll_event));
1281 ep_ctrl.events = EPOLLIN;
1282 ep_ctrl.data.fd = fd_ctrl;
1283
1284 memzero(&ep_inotify, sizeof(struct epoll_event));
1285 ep_inotify.events = EPOLLIN;
1286 ep_inotify.data.fd = fd_inotify;
1287
1288 memzero(&ep_signal, sizeof(struct epoll_event));
1289 ep_signal.events = EPOLLIN;
1290 ep_signal.data.fd = fd_signal;
1291
1292 memzero(&ep_netlink, sizeof(struct epoll_event));
1293 ep_netlink.events = EPOLLIN;
1294 ep_netlink.data.fd = fd_netlink;
1295
1296 memzero(&ep_worker, sizeof(struct epoll_event));
1297 ep_worker.events = EPOLLIN;
1298 ep_worker.data.fd = fd_worker;
1299
1300 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1301 if (fd_ep < 0) {
1302 log_error("error creating epoll fd: %m");
1303 goto exit;
1304 }
1305 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1306 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1307 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1308 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1309 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1310 log_error("fail to add fds to epoll: %m");
1311 goto exit;
1312 }
1313
1314 if (children_max <= 0) {
1315 cpu_set_t cpu_set;
1316
1317 children_max = 8;
1318
1319 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1320 children_max += CPU_COUNT(&cpu_set) * 2;
1321 }
1322 }
1323 log_debug("set children_max to %u", children_max);
1324
1325 rc = udev_rules_apply_static_dev_perms(rules);
1326 if (rc < 0)
1327 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1328
1329 udev_list_node_init(&event_list);
1330 udev_list_node_init(&worker_list);
1331
1332 for (;;) {
1333 static usec_t last_usec;
1334 struct epoll_event ev[8];
1335 int fdcount;
1336 int timeout;
1337 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1338 int i;
1339
1340 if (udev_exit) {
1341 /* close sources of new events and discard buffered events */
1342 if (fd_ctrl >= 0) {
1343 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1344 fd_ctrl = -1;
1345 }
1346 if (monitor != NULL) {
1347 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1348 udev_monitor_unref(monitor);
1349 monitor = NULL;
1350 }
1351 if (fd_inotify >= 0) {
1352 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1353 close(fd_inotify);
1354 fd_inotify = -1;
1355 }
1356
1357 /* discard queued events and kill workers */
1358 event_queue_cleanup(udev, EVENT_QUEUED);
1359 worker_kill(udev);
1360
1361 /* exit after all has cleaned up */
1362 if (udev_list_node_is_empty(&event_list) && children == 0)
1363 break;
1364
1365 /* timeout at exit for workers to finish */
1366 timeout = 30 * MSEC_PER_SEC;
1367 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1368 /* we are idle */
1369 timeout = -1;
1370
1371 /* cleanup possible left-over processes in our cgroup */
1372 if (udev_cgroup)
1373 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1374 } else {
1375 /* kill idle or hanging workers */
1376 timeout = 3 * MSEC_PER_SEC;
1377 }
1378
1379 /* tell settle that we are busy or idle */
1380 if (!udev_list_node_is_empty(&event_list)) {
1381 int fd;
1382
1383 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1384 if (fd >= 0)
1385 close(fd);
1386 } else {
1387 unlink("/run/udev/queue");
1388 }
1389
1390 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1391 if (fdcount < 0)
1392 continue;
1393
1394 if (fdcount == 0) {
1395 struct udev_list_node *loop;
1396
1397 /* timeout */
1398 if (udev_exit) {
1399 log_error("timeout, giving up waiting for workers to finish");
1400 break;
1401 }
1402
1403 /* kill idle workers */
1404 if (udev_list_node_is_empty(&event_list)) {
1405 log_debug("cleanup idle workers");
1406 worker_kill(udev);
1407 }
1408
1409 /* check for hanging events */
1410 udev_list_node_foreach(loop, &worker_list) {
1411 struct worker *worker = node_to_worker(loop);
1412
1413 if (worker->state != WORKER_RUNNING)
1414 continue;
1415
1416 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * USEC_PER_SEC) {
1417 log_error("worker [%u] %s timeout; kill it", worker->pid,
1418 worker->event ? worker->event->devpath : "<idle>");
1419 kill(worker->pid, SIGKILL);
1420 worker->state = WORKER_KILLED;
1421
1422 /* drop reference taken for state 'running' */
1423 worker_unref(worker);
1424 if (worker->event) {
1425 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1426 worker->event->exitcode = -64;
1427 event_queue_delete(worker->event);
1428 worker->event = NULL;
1429 }
1430 }
1431 }
1432
1433 }
1434
1435 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1436 for (i = 0; i < fdcount; i++) {
1437 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1438 is_worker = true;
1439 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1440 is_netlink = true;
1441 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1442 is_signal = true;
1443 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1444 is_inotify = true;
1445 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1446 is_ctrl = true;
1447 }
1448
1449 /* check for changed config, every 3 seconds at most */
1450 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1451 if (udev_rules_check_timestamp(rules))
1452 reload = true;
1453 if (udev_builtin_validate(udev))
1454 reload = true;
1455
1456 last_usec = now(CLOCK_MONOTONIC);
1457 }
1458
1459 /* reload requested, HUP signal received, rules changed, builtin changed */
1460 if (reload) {
1461 worker_kill(udev);
1462 rules = udev_rules_unref(rules);
1463 udev_builtin_exit(udev);
1464 reload = false;
1465 }
1466
1467 /* event has finished */
1468 if (is_worker)
1469 worker_returned(fd_worker);
1470
1471 if (is_netlink) {
1472 struct udev_device *dev;
1473
1474 dev = udev_monitor_receive_device(monitor);
1475 if (dev != NULL) {
1476 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1477 if (event_queue_insert(dev) < 0)
1478 udev_device_unref(dev);
1479 }
1480 }
1481
1482 /* start new events */
1483 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1484 udev_builtin_init(udev);
1485 if (rules == NULL)
1486 rules = udev_rules_new(udev, resolve_names);
1487 if (rules != NULL)
1488 event_queue_start(udev);
1489 }
1490
1491 if (is_signal) {
1492 struct signalfd_siginfo fdsi;
1493 ssize_t size;
1494
1495 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1496 if (size == sizeof(struct signalfd_siginfo))
1497 handle_signal(udev, fdsi.ssi_signo);
1498 }
1499
1500 /* we are shutting down, the events below are not handled anymore */
1501 if (udev_exit)
1502 continue;
1503
1504 /* device node watch */
1505 if (is_inotify)
1506 handle_inotify(udev);
1507
1508 /*
1509 * This needs to be after the inotify handling, to make sure,
1510 * that the ping is send back after the possibly generated
1511 * "change" events by the inotify device node watch.
1512 *
1513 * A single time we may receive a client connection which we need to
1514 * keep open to block the client. It will be closed right before we
1515 * exit.
1516 */
1517 if (is_ctrl)
1518 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1519 }
1520
1521 rc = EXIT_SUCCESS;
1522 exit:
1523 udev_ctrl_cleanup(udev_ctrl);
1524 unlink("/run/udev/queue");
1525 exit_daemonize:
1526 if (fd_ep >= 0)
1527 close(fd_ep);
1528 worker_list_cleanup(udev);
1529 event_queue_cleanup(udev, EVENT_UNDEF);
1530 udev_rules_unref(rules);
1531 udev_builtin_exit(udev);
1532 if (fd_signal >= 0)
1533 close(fd_signal);
1534 if (worker_watch[READ_END] >= 0)
1535 close(worker_watch[READ_END]);
1536 if (worker_watch[WRITE_END] >= 0)
1537 close(worker_watch[WRITE_END]);
1538 udev_monitor_unref(monitor);
1539 udev_ctrl_connection_unref(ctrl_conn);
1540 udev_ctrl_unref(udev_ctrl);
1541 label_finish();
1542 udev_unref(udev);
1543 log_close();
1544 return rc;
1545 }
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