]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/udev/udevd.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
udev: try first re-reading the partition table
[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 int fd;
746 struct udev *udev = udev_device_get_udev(dev);
747 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
748 struct udev_list_entry *item;
749
750 /*
751 * Try to re-read the partition table, this only succeeds if
752 * none of the devices is busy.
753 *
754 * The kernel will send out a change event for the disk, and
755 * "remove/add" for all partitions.
756 */
757 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
758 if (fd >= 0) {
759 r = ioctl(fd, BLKRRPART, 0);
760 close(fd);
761 if (r >= 0)
762 return 0;
763 }
764
765 /*
766 * Re-reading the partition table did not work, synthesize "change"
767 * events for the disk and all partitions.
768 */
769 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
770 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
771 write_string_file(filename, "change");
772
773 e = udev_enumerate_new(udev);
774 if (!e)
775 return -ENOMEM;
776
777 r = udev_enumerate_add_match_parent(e, dev);
778 if (r < 0)
779 return r;
780
781 r = udev_enumerate_add_match_subsystem(e, "block");
782 if (r < 0)
783 return r;
784
785 r = udev_enumerate_scan_devices(e);
786 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
787 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
788
789 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
790 if (!d)
791 continue;
792
793 if (!streq_ptr("partition", udev_device_get_devtype(d)))
794 continue;
795
796 log_debug("device %s closed, synthesising partition '%s' 'change'",
797 udev_device_get_devnode(dev), udev_device_get_devnode(d));
798 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
799 write_string_file(filename, "change");
800 }
801
802 return 0;
803 }
804
805 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
806 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
807 write_string_file(filename, "change");
808
809 return 0;
810 }
811
812 static int handle_inotify(struct udev *udev)
813 {
814 int nbytes, pos;
815 char *buf;
816 struct inotify_event *ev;
817 int r;
818
819 r = ioctl(fd_inotify, FIONREAD, &nbytes);
820 if (r < 0 || nbytes <= 0)
821 return -errno;
822
823 buf = malloc(nbytes);
824 if (!buf) {
825 log_error("error getting buffer for inotify");
826 return -ENOMEM;
827 }
828
829 nbytes = read(fd_inotify, buf, nbytes);
830
831 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
832 struct udev_device *dev;
833
834 ev = (struct inotify_event *)(buf + pos);
835 dev = udev_watch_lookup(udev, ev->wd);
836 if (!dev)
837 continue;
838
839 log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
840 if (ev->mask & IN_CLOSE_WRITE)
841 synthesize_change(dev);
842 else if (ev->mask & IN_IGNORED)
843 udev_watch_end(udev, dev);
844
845 udev_device_unref(dev);
846 }
847
848 free(buf);
849 return 0;
850 }
851
852 static void handle_signal(struct udev *udev, int signo)
853 {
854 switch (signo) {
855 case SIGINT:
856 case SIGTERM:
857 udev_exit = true;
858 break;
859 case SIGCHLD:
860 for (;;) {
861 pid_t pid;
862 int status;
863 struct udev_list_node *loop, *tmp;
864
865 pid = waitpid(-1, &status, WNOHANG);
866 if (pid <= 0)
867 break;
868
869 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
870 struct worker *worker = node_to_worker(loop);
871
872 if (worker->pid != pid)
873 continue;
874 log_debug("worker [%u] exit", pid);
875
876 if (WIFEXITED(status)) {
877 if (WEXITSTATUS(status) != 0)
878 log_error("worker [%u] exit with return code %i",
879 pid, WEXITSTATUS(status));
880 } else if (WIFSIGNALED(status)) {
881 log_error("worker [%u] terminated by signal %i (%s)",
882 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
883 } else if (WIFSTOPPED(status)) {
884 log_error("worker [%u] stopped", pid);
885 } else if (WIFCONTINUED(status)) {
886 log_error("worker [%u] continued", pid);
887 } else {
888 log_error("worker [%u] exit with status 0x%04x", pid, status);
889 }
890
891 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
892 if (worker->event) {
893 log_error("worker [%u] failed while handling '%s'",
894 pid, worker->event->devpath);
895 worker->event->exitcode = -32;
896 event_queue_delete(worker->event);
897
898 /* drop reference taken for state 'running' */
899 worker_unref(worker);
900 }
901 }
902 worker_unref(worker);
903 break;
904 }
905 }
906 break;
907 case SIGHUP:
908 reload = true;
909 break;
910 }
911 }
912
913 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
914 {
915 int ctrl = -1, netlink = -1;
916 int fd, n;
917
918 n = sd_listen_fds(true);
919 if (n <= 0)
920 return -1;
921
922 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
923 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
924 if (ctrl >= 0)
925 return -1;
926 ctrl = fd;
927 continue;
928 }
929
930 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
931 if (netlink >= 0)
932 return -1;
933 netlink = fd;
934 continue;
935 }
936
937 return -1;
938 }
939
940 if (ctrl < 0 || netlink < 0)
941 return -1;
942
943 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
944 *rctrl = ctrl;
945 *rnetlink = netlink;
946 return 0;
947 }
948
949 /*
950 * read the kernel commandline, in case we need to get into debug mode
951 * udev.log-priority=<level> syslog priority
952 * udev.children-max=<number of workers> events are fully serialized if set to 1
953 * udev.exec-delay=<number of seconds> delay execution of every executed program
954 */
955 static void kernel_cmdline_options(struct udev *udev)
956 {
957 _cleanup_free_ char *line = NULL;
958 char *w, *state;
959 size_t l;
960 int r;
961
962 r = proc_cmdline(&line);
963 if (r < 0)
964 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
965 if (r <= 0)
966 return;
967
968 FOREACH_WORD_QUOTED(w, l, line, state) {
969 char *s, *opt;
970
971 s = strndup(w, l);
972 if (!s)
973 break;
974
975 /* accept the same options for the initrd, prefixed with "rd." */
976 if (in_initrd() && startswith(s, "rd."))
977 opt = s + 3;
978 else
979 opt = s;
980
981 if (startswith(opt, "udev.log-priority=")) {
982 int prio;
983
984 prio = util_log_priority(opt + 18);
985 log_set_max_level(prio);
986 udev_set_log_priority(udev, prio);
987 } else if (startswith(opt, "udev.children-max=")) {
988 children_max = strtoul(opt + 18, NULL, 0);
989 } else if (startswith(opt, "udev.exec-delay=")) {
990 exec_delay = strtoul(opt + 16, NULL, 0);
991 }
992
993 free(s);
994 }
995 }
996
997 int main(int argc, char *argv[])
998 {
999 struct udev *udev;
1000 sigset_t mask;
1001 int daemonize = false;
1002 int resolve_names = 1;
1003 static const struct option options[] = {
1004 { "daemon", no_argument, NULL, 'd' },
1005 { "debug", no_argument, NULL, 'D' },
1006 { "children-max", required_argument, NULL, 'c' },
1007 { "exec-delay", required_argument, NULL, 'e' },
1008 { "resolve-names", required_argument, NULL, 'N' },
1009 { "help", no_argument, NULL, 'h' },
1010 { "version", no_argument, NULL, 'V' },
1011 {}
1012 };
1013 int fd_ctrl = -1;
1014 int fd_netlink = -1;
1015 int fd_worker = -1;
1016 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1017 struct udev_ctrl_connection *ctrl_conn = NULL;
1018 int rc = 1;
1019
1020 udev = udev_new();
1021 if (udev == NULL)
1022 goto exit;
1023
1024 log_set_target(LOG_TARGET_AUTO);
1025 log_parse_environment();
1026 log_open();
1027
1028 udev_set_log_fn(udev, udev_main_log);
1029 log_set_max_level(udev_get_log_priority(udev));
1030
1031 log_debug("version %s", VERSION);
1032 label_init("/dev");
1033
1034 for (;;) {
1035 int option;
1036
1037 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1038 if (option == -1)
1039 break;
1040
1041 switch (option) {
1042 case 'd':
1043 daemonize = true;
1044 break;
1045 case 'c':
1046 children_max = strtoul(optarg, NULL, 0);
1047 break;
1048 case 'e':
1049 exec_delay = strtoul(optarg, NULL, 0);
1050 break;
1051 case 'D':
1052 debug = true;
1053 log_set_max_level(LOG_DEBUG);
1054 udev_set_log_priority(udev, LOG_DEBUG);
1055 break;
1056 case 'N':
1057 if (streq(optarg, "early")) {
1058 resolve_names = 1;
1059 } else if (streq(optarg, "late")) {
1060 resolve_names = 0;
1061 } else if (streq(optarg, "never")) {
1062 resolve_names = -1;
1063 } else {
1064 fprintf(stderr, "resolve-names must be early, late or never\n");
1065 log_error("resolve-names must be early, late or never");
1066 goto exit;
1067 }
1068 break;
1069 case 'h':
1070 printf("Usage: udevd OPTIONS\n"
1071 " --daemon\n"
1072 " --debug\n"
1073 " --children-max=<maximum number of workers>\n"
1074 " --exec-delay=<seconds to wait before executing RUN=>\n"
1075 " --resolve-names=early|late|never\n"
1076 " --version\n"
1077 " --help\n"
1078 "\n");
1079 goto exit;
1080 case 'V':
1081 printf("%s\n", VERSION);
1082 goto exit;
1083 default:
1084 goto exit;
1085 }
1086 }
1087
1088 kernel_cmdline_options(udev);
1089
1090 if (getuid() != 0) {
1091 fprintf(stderr, "root privileges required\n");
1092 log_error("root privileges required");
1093 goto exit;
1094 }
1095
1096 /* set umask before creating any file/directory */
1097 chdir("/");
1098 umask(022);
1099
1100 mkdir("/run/udev", 0755);
1101
1102 dev_setup(NULL);
1103
1104 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1105 if (daemonize) {
1106 int fd;
1107
1108 fd = open("/dev/null", O_RDWR);
1109 if (fd >= 0) {
1110 if (write(STDOUT_FILENO, 0, 0) < 0)
1111 dup2(fd, STDOUT_FILENO);
1112 if (write(STDERR_FILENO, 0, 0) < 0)
1113 dup2(fd, STDERR_FILENO);
1114 if (fd > STDERR_FILENO)
1115 close(fd);
1116 } else {
1117 fprintf(stderr, "cannot open /dev/null\n");
1118 log_error("cannot open /dev/null");
1119 }
1120 }
1121
1122 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1123 /* get control and netlink socket from systemd */
1124 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1125 if (udev_ctrl == NULL) {
1126 log_error("error taking over udev control socket");
1127 rc = 1;
1128 goto exit;
1129 }
1130
1131 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1132 if (monitor == NULL) {
1133 log_error("error taking over netlink socket");
1134 rc = 3;
1135 goto exit;
1136 }
1137
1138 /* get our own cgroup, we regularly kill everything udev has left behind */
1139 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1140 udev_cgroup = NULL;
1141 } else {
1142 /* open control and netlink socket */
1143 udev_ctrl = udev_ctrl_new(udev);
1144 if (udev_ctrl == NULL) {
1145 fprintf(stderr, "error initializing udev control socket");
1146 log_error("error initializing udev control socket");
1147 rc = 1;
1148 goto exit;
1149 }
1150 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1151
1152 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1153 if (monitor == NULL) {
1154 fprintf(stderr, "error initializing netlink socket\n");
1155 log_error("error initializing netlink socket");
1156 rc = 3;
1157 goto exit;
1158 }
1159 fd_netlink = udev_monitor_get_fd(monitor);
1160 }
1161
1162 if (udev_monitor_enable_receiving(monitor) < 0) {
1163 fprintf(stderr, "error binding netlink socket\n");
1164 log_error("error binding netlink socket");
1165 rc = 3;
1166 goto exit;
1167 }
1168
1169 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1170 fprintf(stderr, "error binding udev control socket\n");
1171 log_error("error binding udev control socket");
1172 rc = 1;
1173 goto exit;
1174 }
1175
1176 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1177
1178 if (daemonize) {
1179 pid_t pid;
1180
1181 pid = fork();
1182 switch (pid) {
1183 case 0:
1184 break;
1185 case -1:
1186 log_error("fork of daemon failed: %m");
1187 rc = 4;
1188 goto exit;
1189 default:
1190 rc = EXIT_SUCCESS;
1191 goto exit_daemonize;
1192 }
1193
1194 setsid();
1195
1196 write_string_file("/proc/self/oom_score_adj", "-1000");
1197 } else {
1198 sd_notify(1, "READY=1");
1199 }
1200
1201 print_kmsg("starting version " VERSION "\n");
1202
1203 if (!debug) {
1204 int fd;
1205
1206 fd = open("/dev/null", O_RDWR);
1207 if (fd >= 0) {
1208 dup2(fd, STDIN_FILENO);
1209 dup2(fd, STDOUT_FILENO);
1210 dup2(fd, STDERR_FILENO);
1211 close(fd);
1212 }
1213 }
1214
1215 fd_inotify = udev_watch_init(udev);
1216 if (fd_inotify < 0) {
1217 fprintf(stderr, "error initializing inotify\n");
1218 log_error("error initializing inotify");
1219 rc = 4;
1220 goto exit;
1221 }
1222 udev_watch_restore(udev);
1223
1224 /* block and listen to all signals on signalfd */
1225 sigfillset(&mask);
1226 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1227 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1228 if (fd_signal < 0) {
1229 fprintf(stderr, "error creating signalfd\n");
1230 log_error("error creating signalfd");
1231 rc = 5;
1232 goto exit;
1233 }
1234
1235 /* unnamed socket from workers to the main daemon */
1236 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1237 fprintf(stderr, "error creating socketpair\n");
1238 log_error("error creating socketpair");
1239 rc = 6;
1240 goto exit;
1241 }
1242 fd_worker = worker_watch[READ_END];
1243
1244 udev_builtin_init(udev);
1245
1246 rules = udev_rules_new(udev, resolve_names);
1247 if (rules == NULL) {
1248 log_error("error reading rules");
1249 goto exit;
1250 }
1251
1252 memzero(&ep_ctrl, sizeof(struct epoll_event));
1253 ep_ctrl.events = EPOLLIN;
1254 ep_ctrl.data.fd = fd_ctrl;
1255
1256 memzero(&ep_inotify, sizeof(struct epoll_event));
1257 ep_inotify.events = EPOLLIN;
1258 ep_inotify.data.fd = fd_inotify;
1259
1260 memzero(&ep_signal, sizeof(struct epoll_event));
1261 ep_signal.events = EPOLLIN;
1262 ep_signal.data.fd = fd_signal;
1263
1264 memzero(&ep_netlink, sizeof(struct epoll_event));
1265 ep_netlink.events = EPOLLIN;
1266 ep_netlink.data.fd = fd_netlink;
1267
1268 memzero(&ep_worker, sizeof(struct epoll_event));
1269 ep_worker.events = EPOLLIN;
1270 ep_worker.data.fd = fd_worker;
1271
1272 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1273 if (fd_ep < 0) {
1274 log_error("error creating epoll fd: %m");
1275 goto exit;
1276 }
1277 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1278 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1279 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1280 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1281 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1282 log_error("fail to add fds to epoll: %m");
1283 goto exit;
1284 }
1285
1286 if (children_max <= 0) {
1287 cpu_set_t cpu_set;
1288
1289 children_max = 8;
1290
1291 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1292 children_max += CPU_COUNT(&cpu_set) * 2;
1293 }
1294 }
1295 log_debug("set children_max to %u", children_max);
1296
1297 rc = udev_rules_apply_static_dev_perms(rules);
1298 if (rc < 0)
1299 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1300
1301 udev_list_node_init(&event_list);
1302 udev_list_node_init(&worker_list);
1303
1304 for (;;) {
1305 static usec_t last_usec;
1306 struct epoll_event ev[8];
1307 int fdcount;
1308 int timeout;
1309 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1310 int i;
1311
1312 if (udev_exit) {
1313 /* close sources of new events and discard buffered events */
1314 if (fd_ctrl >= 0) {
1315 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1316 fd_ctrl = -1;
1317 }
1318 if (monitor != NULL) {
1319 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1320 udev_monitor_unref(monitor);
1321 monitor = NULL;
1322 }
1323 if (fd_inotify >= 0) {
1324 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1325 close(fd_inotify);
1326 fd_inotify = -1;
1327 }
1328
1329 /* discard queued events and kill workers */
1330 event_queue_cleanup(udev, EVENT_QUEUED);
1331 worker_kill(udev);
1332
1333 /* exit after all has cleaned up */
1334 if (udev_list_node_is_empty(&event_list) && children == 0)
1335 break;
1336
1337 /* timeout at exit for workers to finish */
1338 timeout = 30 * MSEC_PER_SEC;
1339 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1340 /* we are idle */
1341 timeout = -1;
1342
1343 /* cleanup possible left-over processes in our cgroup */
1344 if (udev_cgroup)
1345 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1346 } else {
1347 /* kill idle or hanging workers */
1348 timeout = 3 * MSEC_PER_SEC;
1349 }
1350
1351 /* tell settle that we are busy or idle */
1352 if (!udev_list_node_is_empty(&event_list)) {
1353 int fd;
1354
1355 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1356 if (fd >= 0)
1357 close(fd);
1358 } else {
1359 unlink("/run/udev/queue");
1360 }
1361
1362 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1363 if (fdcount < 0)
1364 continue;
1365
1366 if (fdcount == 0) {
1367 struct udev_list_node *loop;
1368
1369 /* timeout */
1370 if (udev_exit) {
1371 log_error("timeout, giving up waiting for workers to finish");
1372 break;
1373 }
1374
1375 /* kill idle workers */
1376 if (udev_list_node_is_empty(&event_list)) {
1377 log_debug("cleanup idle workers");
1378 worker_kill(udev);
1379 }
1380
1381 /* check for hanging events */
1382 udev_list_node_foreach(loop, &worker_list) {
1383 struct worker *worker = node_to_worker(loop);
1384
1385 if (worker->state != WORKER_RUNNING)
1386 continue;
1387
1388 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * USEC_PER_SEC) {
1389 log_error("worker [%u] %s timeout; kill it", worker->pid,
1390 worker->event ? worker->event->devpath : "<idle>");
1391 kill(worker->pid, SIGKILL);
1392 worker->state = WORKER_KILLED;
1393
1394 /* drop reference taken for state 'running' */
1395 worker_unref(worker);
1396 if (worker->event) {
1397 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1398 worker->event->exitcode = -64;
1399 event_queue_delete(worker->event);
1400 worker->event = NULL;
1401 }
1402 }
1403 }
1404
1405 }
1406
1407 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1408 for (i = 0; i < fdcount; i++) {
1409 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1410 is_worker = true;
1411 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1412 is_netlink = true;
1413 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1414 is_signal = true;
1415 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1416 is_inotify = true;
1417 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1418 is_ctrl = true;
1419 }
1420
1421 /* check for changed config, every 3 seconds at most */
1422 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1423 if (udev_rules_check_timestamp(rules))
1424 reload = true;
1425 if (udev_builtin_validate(udev))
1426 reload = true;
1427
1428 last_usec = now(CLOCK_MONOTONIC);
1429 }
1430
1431 /* reload requested, HUP signal received, rules changed, builtin changed */
1432 if (reload) {
1433 worker_kill(udev);
1434 rules = udev_rules_unref(rules);
1435 udev_builtin_exit(udev);
1436 reload = false;
1437 }
1438
1439 /* event has finished */
1440 if (is_worker)
1441 worker_returned(fd_worker);
1442
1443 if (is_netlink) {
1444 struct udev_device *dev;
1445
1446 dev = udev_monitor_receive_device(monitor);
1447 if (dev != NULL) {
1448 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1449 if (event_queue_insert(dev) < 0)
1450 udev_device_unref(dev);
1451 }
1452 }
1453
1454 /* start new events */
1455 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1456 udev_builtin_init(udev);
1457 if (rules == NULL)
1458 rules = udev_rules_new(udev, resolve_names);
1459 if (rules != NULL)
1460 event_queue_start(udev);
1461 }
1462
1463 if (is_signal) {
1464 struct signalfd_siginfo fdsi;
1465 ssize_t size;
1466
1467 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1468 if (size == sizeof(struct signalfd_siginfo))
1469 handle_signal(udev, fdsi.ssi_signo);
1470 }
1471
1472 /* we are shutting down, the events below are not handled anymore */
1473 if (udev_exit)
1474 continue;
1475
1476 /* device node watch */
1477 if (is_inotify)
1478 handle_inotify(udev);
1479
1480 /*
1481 * This needs to be after the inotify handling, to make sure,
1482 * that the ping is send back after the possibly generated
1483 * "change" events by the inotify device node watch.
1484 *
1485 * A single time we may receive a client connection which we need to
1486 * keep open to block the client. It will be closed right before we
1487 * exit.
1488 */
1489 if (is_ctrl)
1490 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1491 }
1492
1493 rc = EXIT_SUCCESS;
1494 exit:
1495 udev_ctrl_cleanup(udev_ctrl);
1496 unlink("/run/udev/queue");
1497 exit_daemonize:
1498 if (fd_ep >= 0)
1499 close(fd_ep);
1500 worker_list_cleanup(udev);
1501 event_queue_cleanup(udev, EVENT_UNDEF);
1502 udev_rules_unref(rules);
1503 udev_builtin_exit(udev);
1504 if (fd_signal >= 0)
1505 close(fd_signal);
1506 if (worker_watch[READ_END] >= 0)
1507 close(worker_watch[READ_END]);
1508 if (worker_watch[WRITE_END] >= 0)
1509 close(worker_watch[WRITE_END]);
1510 udev_monitor_unref(monitor);
1511 udev_ctrl_connection_unref(ctrl_conn);
1512 udev_ctrl_unref(udev_ctrl);
1513 label_finish();
1514 udev_unref(udev);
1515 log_close();
1516 return rc;
1517 }
Unnamed repository; edit this file 'description' to name the repository.