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