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[thirdparty/systemd.git] / src / udev / udevd.c
1 /*
2 * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
3 * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
4 * Copyright (C) 2009 Canonical Ltd.
5 * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include <stddef.h>
22 #include <signal.h>
23 #include <unistd.h>
24 #include <errno.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <stdbool.h>
28 #include <string.h>
29 #include <ctype.h>
30 #include <fcntl.h>
31 #include <time.h>
32 #include <getopt.h>
33 #include <dirent.h>
34 #include <sys/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 = 30 * 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 #ifdef HAVE_FIRMWARE
104 bool nodelay;
105 #endif
106 };
107
108 static inline struct event *node_to_event(struct udev_list_node *node) {
109 return container_of(node, struct event, node);
110 }
111
112 static void event_queue_cleanup(struct udev *udev, enum event_state type);
113
114 enum worker_state {
115 WORKER_UNDEF,
116 WORKER_RUNNING,
117 WORKER_IDLE,
118 WORKER_KILLED,
119 };
120
121 struct worker {
122 struct udev_list_node node;
123 struct udev *udev;
124 int refcount;
125 pid_t pid;
126 struct udev_monitor *monitor;
127 enum worker_state state;
128 struct event *event;
129 usec_t event_start_usec;
130 };
131
132 /* passed from worker to main process */
133 struct worker_message {
134 pid_t pid;
135 int exitcode;
136 };
137
138 static inline struct worker *node_to_worker(struct udev_list_node *node) {
139 return container_of(node, struct worker, node);
140 }
141
142 static void event_queue_delete(struct event *event) {
143 udev_list_node_remove(&event->node);
144 udev_device_unref(event->dev);
145 free(event);
146 }
147
148 static struct worker *worker_ref(struct worker *worker) {
149 worker->refcount++;
150 return worker;
151 }
152
153 static void worker_cleanup(struct worker *worker) {
154 udev_list_node_remove(&worker->node);
155 udev_monitor_unref(worker->monitor);
156 children--;
157 free(worker);
158 }
159
160 static void worker_unref(struct worker *worker) {
161 worker->refcount--;
162 if (worker->refcount > 0)
163 return;
164 log_debug("worker [%u] cleaned up", worker->pid);
165 worker_cleanup(worker);
166 }
167
168 static void worker_list_cleanup(struct udev *udev) {
169 struct udev_list_node *loop, *tmp;
170
171 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
172 struct worker *worker = node_to_worker(loop);
173
174 worker_cleanup(worker);
175 }
176 }
177
178 static void worker_new(struct event *event) {
179 struct udev *udev = event->udev;
180 struct worker *worker;
181 struct udev_monitor *worker_monitor;
182 pid_t pid;
183
184 /* listen for new events */
185 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
186 if (worker_monitor == NULL)
187 return;
188 /* allow the main daemon netlink address to send devices to the worker */
189 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
190 udev_monitor_enable_receiving(worker_monitor);
191
192 worker = new0(struct worker, 1);
193 if (worker == NULL) {
194 udev_monitor_unref(worker_monitor);
195 return;
196 }
197 /* worker + event reference */
198 worker->refcount = 2;
199 worker->udev = udev;
200
201 pid = fork();
202 switch (pid) {
203 case 0: {
204 struct udev_device *dev = NULL;
205 int fd_monitor;
206 struct epoll_event ep_signal, ep_monitor;
207 sigset_t mask;
208 int rc = EXIT_SUCCESS;
209
210 /* take initial device from queue */
211 dev = event->dev;
212 event->dev = NULL;
213
214 free(worker);
215 worker_list_cleanup(udev);
216 event_queue_cleanup(udev, EVENT_UNDEF);
217 udev_monitor_unref(monitor);
218 udev_ctrl_unref(udev_ctrl);
219 close(fd_signal);
220 close(fd_ep);
221 close(worker_watch[READ_END]);
222
223 sigfillset(&mask);
224 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
225 if (fd_signal < 0) {
226 log_error("error creating signalfd %m");
227 rc = 2;
228 goto out;
229 }
230
231 fd_ep = epoll_create1(EPOLL_CLOEXEC);
232 if (fd_ep < 0) {
233 log_error("error creating epoll fd: %m");
234 rc = 3;
235 goto out;
236 }
237
238 memzero(&ep_signal, sizeof(struct epoll_event));
239 ep_signal.events = EPOLLIN;
240 ep_signal.data.fd = fd_signal;
241
242 fd_monitor = udev_monitor_get_fd(worker_monitor);
243 memzero(&ep_monitor, sizeof(struct epoll_event));
244 ep_monitor.events = EPOLLIN;
245 ep_monitor.data.fd = fd_monitor;
246
247 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
248 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
249 log_error("fail to add fds to epoll: %m");
250 rc = 4;
251 goto out;
252 }
253
254 /* request TERM signal if parent exits */
255 prctl(PR_SET_PDEATHSIG, SIGTERM);
256
257 /* reset OOM score, we only protect the main daemon */
258 write_string_file("/proc/self/oom_score_adj", "0");
259
260 for (;;) {
261 struct udev_event *udev_event;
262 struct worker_message msg;
263 int fd_lock = -1;
264 int err = 0;
265
266 log_debug("seq %llu running", udev_device_get_seqnum(dev));
267 udev_event = udev_event_new(dev);
268 if (udev_event == NULL) {
269 rc = 5;
270 goto out;
271 }
272
273 /* needed for SIGCHLD/SIGTERM in spawn() */
274 udev_event->fd_signal = fd_signal;
275
276 if (exec_delay > 0)
277 udev_event->exec_delay = exec_delay;
278
279 /*
280 * Take a shared lock on the device node; this establishes
281 * a concept of device "ownership" to serialize device
282 * access. External processes holding an exclusive lock will
283 * cause udev to skip the event handling; in the case udev
284 * acquired the lock, the external process can block until
285 * udev has finished its event handling.
286 */
287 if (!streq_ptr(udev_device_get_action(dev), "remove") &&
288 streq_ptr("block", udev_device_get_subsystem(dev)) &&
289 !startswith(udev_device_get_sysname(dev), "dm-") &&
290 !startswith(udev_device_get_sysname(dev), "md")) {
291 struct udev_device *d = dev;
292
293 if (streq_ptr("partition", udev_device_get_devtype(d)))
294 d = udev_device_get_parent(d);
295
296 if (d) {
297 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
298 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
299 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
300 err = -EWOULDBLOCK;
301 fd_lock = safe_close(fd_lock);
302 goto skip;
303 }
304 }
305 }
306
307 /* apply rules, create node, symlinks */
308 udev_event_execute_rules(udev_event, event_timeout_usec, rules, &sigmask_orig);
309
310 udev_event_execute_run(udev_event, event_timeout_usec, &sigmask_orig);
311
312 /* apply/restore inotify watch */
313 if (udev_event->inotify_watch) {
314 udev_watch_begin(udev, dev);
315 udev_device_update_db(dev);
316 }
317
318 safe_close(fd_lock);
319
320 /* send processed event back to libudev listeners */
321 udev_monitor_send_device(worker_monitor, NULL, dev);
322
323 skip:
324 /* send udevd the result of the event execution */
325 memzero(&msg, sizeof(struct worker_message));
326 msg.exitcode = err;
327 msg.pid = getpid();
328 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
329
330 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
331
332 udev_device_unref(dev);
333 dev = NULL;
334
335 if (udev_event->sigterm) {
336 udev_event_unref(udev_event);
337 goto out;
338 }
339
340 udev_event_unref(udev_event);
341
342 /* wait for more device messages from main udevd, or term signal */
343 while (dev == NULL) {
344 struct epoll_event ev[4];
345 int fdcount;
346 int i;
347
348 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
349 if (fdcount < 0) {
350 if (errno == EINTR)
351 continue;
352 log_error("failed to poll: %m");
353 goto out;
354 }
355
356 for (i = 0; i < fdcount; i++) {
357 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
358 dev = udev_monitor_receive_device(worker_monitor);
359 break;
360 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
361 struct signalfd_siginfo fdsi;
362 ssize_t size;
363
364 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
365 if (size != sizeof(struct signalfd_siginfo))
366 continue;
367 switch (fdsi.ssi_signo) {
368 case SIGTERM:
369 goto out;
370 }
371 }
372 }
373 }
374 }
375 out:
376 udev_device_unref(dev);
377 safe_close(fd_signal);
378 safe_close(fd_ep);
379 close(fd_inotify);
380 close(worker_watch[WRITE_END]);
381 udev_rules_unref(rules);
382 udev_builtin_exit(udev);
383 udev_monitor_unref(worker_monitor);
384 udev_unref(udev);
385 log_close();
386 exit(rc);
387 }
388 case -1:
389 udev_monitor_unref(worker_monitor);
390 event->state = EVENT_QUEUED;
391 free(worker);
392 log_error("fork of child failed: %m");
393 break;
394 default:
395 /* close monitor, but keep address around */
396 udev_monitor_disconnect(worker_monitor);
397 worker->monitor = worker_monitor;
398 worker->pid = pid;
399 worker->state = WORKER_RUNNING;
400 worker->event_start_usec = now(CLOCK_MONOTONIC);
401 worker->event = event;
402 event->state = EVENT_RUNNING;
403 udev_list_node_append(&worker->node, &worker_list);
404 children++;
405 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
406 break;
407 }
408 }
409
410 static void event_run(struct event *event) {
411 struct udev_list_node *loop;
412
413 udev_list_node_foreach(loop, &worker_list) {
414 struct worker *worker = node_to_worker(loop);
415 ssize_t count;
416
417 if (worker->state != WORKER_IDLE)
418 continue;
419
420 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
421 if (count < 0) {
422 log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
423 kill(worker->pid, SIGKILL);
424 worker->state = WORKER_KILLED;
425 continue;
426 }
427 worker_ref(worker);
428 worker->event = event;
429 worker->state = WORKER_RUNNING;
430 worker->event_start_usec = now(CLOCK_MONOTONIC);
431 event->state = EVENT_RUNNING;
432 return;
433 }
434
435 if (children >= children_max) {
436 if (children_max > 1)
437 log_debug("maximum number (%i) of children reached", children);
438 return;
439 }
440
441 /* start new worker and pass initial device */
442 worker_new(event);
443 }
444
445 static int event_queue_insert(struct udev_device *dev) {
446 struct event *event;
447
448 event = new0(struct event, 1);
449 if (event == NULL)
450 return -1;
451
452 event->udev = udev_device_get_udev(dev);
453 event->dev = dev;
454 event->seqnum = udev_device_get_seqnum(dev);
455 event->devpath = udev_device_get_devpath(dev);
456 event->devpath_len = strlen(event->devpath);
457 event->devpath_old = udev_device_get_devpath_old(dev);
458 event->devnum = udev_device_get_devnum(dev);
459 event->is_block = streq("block", udev_device_get_subsystem(dev));
460 event->ifindex = udev_device_get_ifindex(dev);
461 #ifdef HAVE_FIRMWARE
462 if (streq(udev_device_get_subsystem(dev), "firmware"))
463 event->nodelay = true;
464 #endif
465
466 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
467 udev_device_get_action(dev), udev_device_get_subsystem(dev));
468
469 event->state = EVENT_QUEUED;
470 udev_list_node_append(&event->node, &event_list);
471 return 0;
472 }
473
474 static void worker_kill(struct udev *udev) {
475 struct udev_list_node *loop;
476
477 udev_list_node_foreach(loop, &worker_list) {
478 struct worker *worker = node_to_worker(loop);
479
480 if (worker->state == WORKER_KILLED)
481 continue;
482
483 worker->state = WORKER_KILLED;
484 kill(worker->pid, SIGTERM);
485 }
486 }
487
488 /* lookup event for identical, parent, child device */
489 static bool is_devpath_busy(struct event *event) {
490 struct udev_list_node *loop;
491 size_t common;
492
493 /* check if queue contains events we depend on */
494 udev_list_node_foreach(loop, &event_list) {
495 struct event *loop_event = node_to_event(loop);
496
497 /* we already found a later event, earlier can not block us, no need to check again */
498 if (loop_event->seqnum < event->delaying_seqnum)
499 continue;
500
501 /* event we checked earlier still exists, no need to check again */
502 if (loop_event->seqnum == event->delaying_seqnum)
503 return true;
504
505 /* found ourself, no later event can block us */
506 if (loop_event->seqnum >= event->seqnum)
507 break;
508
509 /* check major/minor */
510 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
511 return true;
512
513 /* check network device ifindex */
514 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
515 return true;
516
517 /* check our old name */
518 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
519 event->delaying_seqnum = loop_event->seqnum;
520 return true;
521 }
522
523 /* compare devpath */
524 common = MIN(loop_event->devpath_len, event->devpath_len);
525
526 /* one devpath is contained in the other? */
527 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
528 continue;
529
530 /* identical device event found */
531 if (loop_event->devpath_len == event->devpath_len) {
532 /* devices names might have changed/swapped in the meantime */
533 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
534 continue;
535 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
536 continue;
537 event->delaying_seqnum = loop_event->seqnum;
538 return true;
539 }
540
541 #ifdef HAVE_FIRMWARE
542 /* allow to bypass the dependency tracking */
543 if (event->nodelay)
544 continue;
545 #endif
546
547 /* parent device event found */
548 if (event->devpath[common] == '/') {
549 event->delaying_seqnum = loop_event->seqnum;
550 return true;
551 }
552
553 /* child device event found */
554 if (loop_event->devpath[common] == '/') {
555 event->delaying_seqnum = loop_event->seqnum;
556 return true;
557 }
558
559 /* no matching device */
560 continue;
561 }
562
563 return false;
564 }
565
566 static void event_queue_start(struct udev *udev) {
567 struct udev_list_node *loop;
568
569 udev_list_node_foreach(loop, &event_list) {
570 struct event *event = node_to_event(loop);
571
572 if (event->state != EVENT_QUEUED)
573 continue;
574
575 /* do not start event if parent or child event is still running */
576 if (is_devpath_busy(event))
577 continue;
578
579 event_run(event);
580 }
581 }
582
583 static void event_queue_cleanup(struct udev *udev, enum event_state match_type) {
584 struct udev_list_node *loop, *tmp;
585
586 udev_list_node_foreach_safe(loop, tmp, &event_list) {
587 struct event *event = node_to_event(loop);
588
589 if (match_type != EVENT_UNDEF && match_type != event->state)
590 continue;
591
592 event_queue_delete(event);
593 }
594 }
595
596 static void worker_returned(int fd_worker) {
597 for (;;) {
598 struct worker_message msg;
599 ssize_t size;
600 struct udev_list_node *loop;
601
602 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
603 if (size != sizeof(struct worker_message))
604 break;
605
606 /* lookup worker who sent the signal */
607 udev_list_node_foreach(loop, &worker_list) {
608 struct worker *worker = node_to_worker(loop);
609
610 if (worker->pid != msg.pid)
611 continue;
612
613 /* worker returned */
614 if (worker->event) {
615 worker->event->exitcode = msg.exitcode;
616 event_queue_delete(worker->event);
617 worker->event = NULL;
618 }
619 if (worker->state != WORKER_KILLED)
620 worker->state = WORKER_IDLE;
621 worker_unref(worker);
622 break;
623 }
624 }
625 }
626
627 /* receive the udevd message from userspace */
628 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) {
629 struct udev *udev = udev_ctrl_get_udev(uctrl);
630 struct udev_ctrl_connection *ctrl_conn;
631 struct udev_ctrl_msg *ctrl_msg = NULL;
632 const char *str;
633 int i;
634
635 ctrl_conn = udev_ctrl_get_connection(uctrl);
636 if (ctrl_conn == NULL)
637 goto out;
638
639 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
640 if (ctrl_msg == NULL)
641 goto out;
642
643 i = udev_ctrl_get_set_log_level(ctrl_msg);
644 if (i >= 0) {
645 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
646 log_set_max_level(i);
647 udev_set_log_priority(udev, i);
648 worker_kill(udev);
649 }
650
651 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
652 log_debug("udevd message (STOP_EXEC_QUEUE) received");
653 stop_exec_queue = true;
654 }
655
656 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
657 log_debug("udevd message (START_EXEC_QUEUE) received");
658 stop_exec_queue = false;
659 }
660
661 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
662 log_debug("udevd message (RELOAD) received");
663 reload = true;
664 }
665
666 str = udev_ctrl_get_set_env(ctrl_msg);
667 if (str != NULL) {
668 char *key;
669
670 key = strdup(str);
671 if (key != NULL) {
672 char *val;
673
674 val = strchr(key, '=');
675 if (val != NULL) {
676 val[0] = '\0';
677 val = &val[1];
678 if (val[0] == '\0') {
679 log_debug("udevd message (ENV) received, unset '%s'", key);
680 udev_add_property(udev, key, NULL);
681 } else {
682 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
683 udev_add_property(udev, key, val);
684 }
685 } else {
686 log_error("wrong key format '%s'", key);
687 }
688 free(key);
689 }
690 worker_kill(udev);
691 }
692
693 i = udev_ctrl_get_set_children_max(ctrl_msg);
694 if (i >= 0) {
695 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
696 children_max = i;
697 }
698
699 if (udev_ctrl_get_ping(ctrl_msg) > 0)
700 log_debug("udevd message (SYNC) received");
701
702 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
703 log_debug("udevd message (EXIT) received");
704 udev_exit = true;
705 /* keep reference to block the client until we exit */
706 udev_ctrl_connection_ref(ctrl_conn);
707 }
708 out:
709 udev_ctrl_msg_unref(ctrl_msg);
710 return udev_ctrl_connection_unref(ctrl_conn);
711 }
712
713 static int synthesize_change(struct udev_device *dev) {
714 char filename[UTIL_PATH_SIZE];
715 int r;
716
717 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
718 streq_ptr("disk", udev_device_get_devtype(dev)) &&
719 !startswith(udev_device_get_sysname(dev), "dm-")) {
720 bool part_table_read = false;
721 bool has_partitions = false;
722 int fd;
723 struct udev *udev = udev_device_get_udev(dev);
724 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
725 struct udev_list_entry *item;
726
727 /*
728 * Try to re-read the partition table. This only succeeds if
729 * none of the devices is busy. The kernel returns 0 if no
730 * partition table is found, and we will not get an event for
731 * the disk.
732 */
733 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
734 if (fd >= 0) {
735 r = flock(fd, LOCK_EX|LOCK_NB);
736 if (r >= 0)
737 r = ioctl(fd, BLKRRPART, 0);
738
739 close(fd);
740 if (r >= 0)
741 part_table_read = true;
742 }
743
744 /* search for partitions */
745 e = udev_enumerate_new(udev);
746 if (!e)
747 return -ENOMEM;
748
749 r = udev_enumerate_add_match_parent(e, dev);
750 if (r < 0)
751 return r;
752
753 r = udev_enumerate_add_match_subsystem(e, "block");
754 if (r < 0)
755 return r;
756
757 r = udev_enumerate_scan_devices(e);
758 if (r < 0)
759 return r;
760
761 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
762 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
763
764 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
765 if (!d)
766 continue;
767
768 if (!streq_ptr("partition", udev_device_get_devtype(d)))
769 continue;
770
771 has_partitions = true;
772 break;
773 }
774
775 /*
776 * We have partitions and re-read the table, the kernel already sent
777 * out a "change" event for the disk, and "remove/add" for all
778 * partitions.
779 */
780 if (part_table_read && has_partitions)
781 return 0;
782
783 /*
784 * We have partitions but re-reading the partition table did not
785 * work, synthesize "change" for the disk and all partitions.
786 */
787 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
788 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
789 write_string_file(filename, "change");
790
791 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
792 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
793
794 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
795 if (!d)
796 continue;
797
798 if (!streq_ptr("partition", udev_device_get_devtype(d)))
799 continue;
800
801 log_debug("device %s closed, synthesising partition '%s' 'change'",
802 udev_device_get_devnode(dev), udev_device_get_devnode(d));
803 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
804 write_string_file(filename, "change");
805 }
806
807 return 0;
808 }
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 return 0;
815 }
816
817 static int handle_inotify(struct udev *udev) {
818 int nbytes, pos;
819 char *buf;
820 struct inotify_event *ev;
821 int r;
822
823 r = ioctl(fd_inotify, FIONREAD, &nbytes);
824 if (r < 0 || nbytes <= 0)
825 return -errno;
826
827 buf = malloc(nbytes);
828 if (!buf) {
829 log_error("error getting buffer for inotify");
830 return -ENOMEM;
831 }
832
833 nbytes = read(fd_inotify, buf, nbytes);
834
835 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
836 struct udev_device *dev;
837
838 ev = (struct inotify_event *)(buf + pos);
839 dev = udev_watch_lookup(udev, ev->wd);
840 if (!dev)
841 continue;
842
843 log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
844 if (ev->mask & IN_CLOSE_WRITE)
845 synthesize_change(dev);
846 else if (ev->mask & IN_IGNORED)
847 udev_watch_end(udev, dev);
848
849 udev_device_unref(dev);
850 }
851
852 free(buf);
853 return 0;
854 }
855
856 static void handle_signal(struct udev *udev, int signo) {
857 switch (signo) {
858 case SIGINT:
859 case SIGTERM:
860 udev_exit = true;
861 break;
862 case SIGCHLD:
863 for (;;) {
864 pid_t pid;
865 int status;
866 struct udev_list_node *loop, *tmp;
867
868 pid = waitpid(-1, &status, WNOHANG);
869 if (pid <= 0)
870 break;
871
872 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
873 struct worker *worker = node_to_worker(loop);
874
875 if (worker->pid != pid)
876 continue;
877 log_debug("worker [%u] exit", pid);
878
879 if (WIFEXITED(status)) {
880 if (WEXITSTATUS(status) != 0)
881 log_error("worker [%u] exit with return code %i",
882 pid, WEXITSTATUS(status));
883 } else if (WIFSIGNALED(status)) {
884 log_error("worker [%u] terminated by signal %i (%s)",
885 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
886 } else if (WIFSTOPPED(status)) {
887 log_error("worker [%u] stopped", pid);
888 } else if (WIFCONTINUED(status)) {
889 log_error("worker [%u] continued", pid);
890 } else {
891 log_error("worker [%u] exit with status 0x%04x", pid, status);
892 }
893
894 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
895 if (worker->event) {
896 log_error("worker [%u] failed while handling '%s'",
897 pid, worker->event->devpath);
898 worker->event->exitcode = -32;
899 event_queue_delete(worker->event);
900
901 /* drop reference taken for state 'running' */
902 worker_unref(worker);
903 }
904 }
905 worker_unref(worker);
906 break;
907 }
908 }
909 break;
910 case SIGHUP:
911 reload = true;
912 break;
913 }
914 }
915
916 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) {
917 int ctrl = -1, netlink = -1;
918 int fd, n;
919
920 n = sd_listen_fds(true);
921 if (n <= 0)
922 return -1;
923
924 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
925 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
926 if (ctrl >= 0)
927 return -1;
928 ctrl = fd;
929 continue;
930 }
931
932 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
933 if (netlink >= 0)
934 return -1;
935 netlink = fd;
936 continue;
937 }
938
939 return -1;
940 }
941
942 if (ctrl < 0 || netlink < 0)
943 return -1;
944
945 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
946 *rctrl = ctrl;
947 *rnetlink = netlink;
948 return 0;
949 }
950
951 /*
952 * read the kernel commandline, in case we need to get into debug mode
953 * udev.log-priority=<level> syslog priority
954 * udev.children-max=<number of workers> events are fully serialized if set to 1
955 * udev.exec-delay=<number of seconds> delay execution of every executed program
956 */
957 static void kernel_cmdline_options(struct udev *udev) {
958 _cleanup_free_ char *line = NULL;
959 char *w, *state;
960 size_t l;
961 int r;
962
963 r = proc_cmdline(&line);
964 if (r < 0)
965 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
966 if (r <= 0)
967 return;
968
969 FOREACH_WORD_QUOTED(w, l, line, state) {
970 char *s, *opt;
971
972 s = strndup(w, l);
973 if (!s)
974 break;
975
976 /* accept the same options for the initrd, prefixed with "rd." */
977 if (in_initrd() && startswith(s, "rd."))
978 opt = s + 3;
979 else
980 opt = s;
981
982 if (startswith(opt, "udev.log-priority=")) {
983 int prio;
984
985 prio = util_log_priority(opt + 18);
986 log_set_max_level(prio);
987 udev_set_log_priority(udev, prio);
988 } else if (startswith(opt, "udev.children-max=")) {
989 children_max = strtoul(opt + 18, NULL, 0);
990 } else if (startswith(opt, "udev.exec-delay=")) {
991 exec_delay = strtoul(opt + 16, NULL, 0);
992 } else if (startswith(opt, "udev.event-timeout=")) {
993 event_timeout_usec = strtoul(opt + 16, NULL, 0) * USEC_PER_SEC;
994 }
995
996 free(s);
997 }
998 }
999
1000 int main(int argc, char *argv[]) {
1001 struct udev *udev;
1002 sigset_t mask;
1003 int daemonize = false;
1004 int resolve_names = 1;
1005 static const struct option options[] = {
1006 { "daemon", no_argument, NULL, 'd' },
1007 { "debug", no_argument, NULL, 'D' },
1008 { "children-max", required_argument, NULL, 'c' },
1009 { "exec-delay", required_argument, NULL, 'e' },
1010 { "event-timeout", required_argument, NULL, 't' },
1011 { "resolve-names", required_argument, NULL, 'N' },
1012 { "help", no_argument, NULL, 'h' },
1013 { "version", no_argument, NULL, 'V' },
1014 {}
1015 };
1016 int fd_ctrl = -1;
1017 int fd_netlink = -1;
1018 int fd_worker = -1;
1019 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1020 struct udev_ctrl_connection *ctrl_conn = NULL;
1021 int rc = 1;
1022
1023 udev = udev_new();
1024 if (udev == NULL)
1025 goto exit;
1026
1027 log_set_target(LOG_TARGET_AUTO);
1028 log_parse_environment();
1029 log_open();
1030
1031 udev_set_log_fn(udev, udev_main_log);
1032 log_set_max_level(udev_get_log_priority(udev));
1033
1034 log_debug("version %s", VERSION);
1035 label_init("/dev");
1036
1037 for (;;) {
1038 int option;
1039
1040 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1041 if (option == -1)
1042 break;
1043
1044 switch (option) {
1045 case 'd':
1046 daemonize = true;
1047 break;
1048 case 'c':
1049 children_max = strtoul(optarg, NULL, 0);
1050 break;
1051 case 'e':
1052 exec_delay = strtoul(optarg, NULL, 0);
1053 break;
1054 case 't':
1055 event_timeout_usec = strtoul(optarg, NULL, 0) * USEC_PER_SEC;
1056 break;
1057 case 'D':
1058 debug = true;
1059 log_set_max_level(LOG_DEBUG);
1060 udev_set_log_priority(udev, LOG_DEBUG);
1061 break;
1062 case 'N':
1063 if (streq(optarg, "early")) {
1064 resolve_names = 1;
1065 } else if (streq(optarg, "late")) {
1066 resolve_names = 0;
1067 } else if (streq(optarg, "never")) {
1068 resolve_names = -1;
1069 } else {
1070 fprintf(stderr, "resolve-names must be early, late or never\n");
1071 log_error("resolve-names must be early, late or never");
1072 goto exit;
1073 }
1074 break;
1075 case 'h':
1076 printf("Usage: udevd OPTIONS\n"
1077 " --daemon\n"
1078 " --debug\n"
1079 " --children-max=<maximum number of workers>\n"
1080 " --exec-delay=<seconds to wait before executing RUN=>\n"
1081 " --event-timeout=<seconds to wait before terminating an event>\n"
1082 " --resolve-names=early|late|never\n"
1083 " --version\n"
1084 " --help\n"
1085 "\n");
1086 goto exit;
1087 case 'V':
1088 printf("%s\n", VERSION);
1089 goto exit;
1090 default:
1091 goto exit;
1092 }
1093 }
1094
1095 kernel_cmdline_options(udev);
1096
1097 if (getuid() != 0) {
1098 fprintf(stderr, "root privileges required\n");
1099 log_error("root privileges required");
1100 goto exit;
1101 }
1102
1103 /* set umask before creating any file/directory */
1104 chdir("/");
1105 umask(022);
1106
1107 mkdir("/run/udev", 0755);
1108
1109 dev_setup(NULL);
1110
1111 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1112 if (daemonize) {
1113 int fd;
1114
1115 fd = open("/dev/null", O_RDWR);
1116 if (fd >= 0) {
1117 if (write(STDOUT_FILENO, 0, 0) < 0)
1118 dup2(fd, STDOUT_FILENO);
1119 if (write(STDERR_FILENO, 0, 0) < 0)
1120 dup2(fd, STDERR_FILENO);
1121 if (fd > STDERR_FILENO)
1122 close(fd);
1123 } else {
1124 fprintf(stderr, "cannot open /dev/null\n");
1125 log_error("cannot open /dev/null");
1126 }
1127 }
1128
1129 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1130 /* get control and netlink socket from systemd */
1131 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1132 if (udev_ctrl == NULL) {
1133 log_error("error taking over udev control socket");
1134 rc = 1;
1135 goto exit;
1136 }
1137
1138 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1139 if (monitor == NULL) {
1140 log_error("error taking over netlink socket");
1141 rc = 3;
1142 goto exit;
1143 }
1144
1145 /* get our own cgroup, we regularly kill everything udev has left behind */
1146 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1147 udev_cgroup = NULL;
1148 } else {
1149 /* open control and netlink socket */
1150 udev_ctrl = udev_ctrl_new(udev);
1151 if (udev_ctrl == NULL) {
1152 fprintf(stderr, "error initializing udev control socket");
1153 log_error("error initializing udev control socket");
1154 rc = 1;
1155 goto exit;
1156 }
1157 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1158
1159 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1160 if (monitor == NULL) {
1161 fprintf(stderr, "error initializing netlink socket\n");
1162 log_error("error initializing netlink socket");
1163 rc = 3;
1164 goto exit;
1165 }
1166 fd_netlink = udev_monitor_get_fd(monitor);
1167 }
1168
1169 if (udev_monitor_enable_receiving(monitor) < 0) {
1170 fprintf(stderr, "error binding netlink socket\n");
1171 log_error("error binding netlink socket");
1172 rc = 3;
1173 goto exit;
1174 }
1175
1176 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1177 fprintf(stderr, "error binding udev control socket\n");
1178 log_error("error binding udev control socket");
1179 rc = 1;
1180 goto exit;
1181 }
1182
1183 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1184
1185 if (daemonize) {
1186 pid_t pid;
1187
1188 pid = fork();
1189 switch (pid) {
1190 case 0:
1191 break;
1192 case -1:
1193 log_error("fork of daemon failed: %m");
1194 rc = 4;
1195 goto exit;
1196 default:
1197 rc = EXIT_SUCCESS;
1198 goto exit_daemonize;
1199 }
1200
1201 setsid();
1202
1203 write_string_file("/proc/self/oom_score_adj", "-1000");
1204 } else {
1205 sd_notify(1, "READY=1");
1206 }
1207
1208 print_kmsg("starting version " VERSION "\n");
1209
1210 if (!debug) {
1211 int fd;
1212
1213 fd = open("/dev/null", O_RDWR);
1214 if (fd >= 0) {
1215 dup2(fd, STDIN_FILENO);
1216 dup2(fd, STDOUT_FILENO);
1217 dup2(fd, STDERR_FILENO);
1218 close(fd);
1219 }
1220 }
1221
1222 fd_inotify = udev_watch_init(udev);
1223 if (fd_inotify < 0) {
1224 fprintf(stderr, "error initializing inotify\n");
1225 log_error("error initializing inotify");
1226 rc = 4;
1227 goto exit;
1228 }
1229 udev_watch_restore(udev);
1230
1231 /* block and listen to all signals on signalfd */
1232 sigfillset(&mask);
1233 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1234 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1235 if (fd_signal < 0) {
1236 fprintf(stderr, "error creating signalfd\n");
1237 log_error("error creating signalfd");
1238 rc = 5;
1239 goto exit;
1240 }
1241
1242 /* unnamed socket from workers to the main daemon */
1243 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1244 fprintf(stderr, "error creating socketpair\n");
1245 log_error("error creating socketpair");
1246 rc = 6;
1247 goto exit;
1248 }
1249 fd_worker = worker_watch[READ_END];
1250
1251 udev_builtin_init(udev);
1252
1253 rules = udev_rules_new(udev, resolve_names);
1254 if (rules == NULL) {
1255 log_error("error reading rules");
1256 goto exit;
1257 }
1258
1259 memzero(&ep_ctrl, sizeof(struct epoll_event));
1260 ep_ctrl.events = EPOLLIN;
1261 ep_ctrl.data.fd = fd_ctrl;
1262
1263 memzero(&ep_inotify, sizeof(struct epoll_event));
1264 ep_inotify.events = EPOLLIN;
1265 ep_inotify.data.fd = fd_inotify;
1266
1267 memzero(&ep_signal, sizeof(struct epoll_event));
1268 ep_signal.events = EPOLLIN;
1269 ep_signal.data.fd = fd_signal;
1270
1271 memzero(&ep_netlink, sizeof(struct epoll_event));
1272 ep_netlink.events = EPOLLIN;
1273 ep_netlink.data.fd = fd_netlink;
1274
1275 memzero(&ep_worker, sizeof(struct epoll_event));
1276 ep_worker.events = EPOLLIN;
1277 ep_worker.data.fd = fd_worker;
1278
1279 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1280 if (fd_ep < 0) {
1281 log_error("error creating epoll fd: %m");
1282 goto exit;
1283 }
1284 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1285 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1286 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1287 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1288 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1289 log_error("fail to add fds to epoll: %m");
1290 goto exit;
1291 }
1292
1293 if (children_max <= 0) {
1294 cpu_set_t cpu_set;
1295
1296 children_max = 8;
1297
1298 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1299 children_max += CPU_COUNT(&cpu_set) * 2;
1300 }
1301 }
1302 log_debug("set children_max to %u", children_max);
1303
1304 rc = udev_rules_apply_static_dev_perms(rules);
1305 if (rc < 0)
1306 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1307
1308 udev_list_node_init(&event_list);
1309 udev_list_node_init(&worker_list);
1310
1311 for (;;) {
1312 static usec_t last_usec;
1313 struct epoll_event ev[8];
1314 int fdcount;
1315 int timeout;
1316 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1317 int i;
1318
1319 if (udev_exit) {
1320 /* close sources of new events and discard buffered events */
1321 if (fd_ctrl >= 0) {
1322 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1323 fd_ctrl = -1;
1324 }
1325 if (monitor != NULL) {
1326 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1327 udev_monitor_unref(monitor);
1328 monitor = NULL;
1329 }
1330 if (fd_inotify >= 0) {
1331 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1332 close(fd_inotify);
1333 fd_inotify = -1;
1334 }
1335
1336 /* discard queued events and kill workers */
1337 event_queue_cleanup(udev, EVENT_QUEUED);
1338 worker_kill(udev);
1339
1340 /* exit after all has cleaned up */
1341 if (udev_list_node_is_empty(&event_list) && children == 0)
1342 break;
1343
1344 /* timeout at exit for workers to finish */
1345 timeout = 30 * MSEC_PER_SEC;
1346 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1347 /* we are idle */
1348 timeout = -1;
1349
1350 /* cleanup possible left-over processes in our cgroup */
1351 if (udev_cgroup)
1352 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1353 } else {
1354 /* kill idle or hanging workers */
1355 timeout = 3 * MSEC_PER_SEC;
1356 }
1357
1358 /* tell settle that we are busy or idle */
1359 if (!udev_list_node_is_empty(&event_list)) {
1360 int fd;
1361
1362 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1363 if (fd >= 0)
1364 close(fd);
1365 } else {
1366 unlink("/run/udev/queue");
1367 }
1368
1369 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1370 if (fdcount < 0)
1371 continue;
1372
1373 if (fdcount == 0) {
1374 struct udev_list_node *loop;
1375
1376 /* timeout */
1377 if (udev_exit) {
1378 log_error("timeout, giving up waiting for workers to finish");
1379 break;
1380 }
1381
1382 /* kill idle workers */
1383 if (udev_list_node_is_empty(&event_list)) {
1384 log_debug("cleanup idle workers");
1385 worker_kill(udev);
1386 }
1387
1388 /* check for hanging events */
1389 udev_list_node_foreach(loop, &worker_list) {
1390 struct worker *worker = node_to_worker(loop);
1391
1392 if (worker->state != WORKER_RUNNING)
1393 continue;
1394
1395 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > event_timeout_usec) {
1396 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1397 kill(worker->pid, SIGKILL);
1398 worker->state = WORKER_KILLED;
1399
1400 /* drop reference taken for state 'running' */
1401 worker_unref(worker);
1402 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1403 worker->event->exitcode = -64;
1404 event_queue_delete(worker->event);
1405 worker->event = NULL;
1406 }
1407 }
1408
1409 }
1410
1411 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1412 for (i = 0; i < fdcount; i++) {
1413 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1414 is_worker = true;
1415 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1416 is_netlink = true;
1417 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1418 is_signal = true;
1419 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1420 is_inotify = true;
1421 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1422 is_ctrl = true;
1423 }
1424
1425 /* check for changed config, every 3 seconds at most */
1426 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1427 if (udev_rules_check_timestamp(rules))
1428 reload = true;
1429 if (udev_builtin_validate(udev))
1430 reload = true;
1431
1432 last_usec = now(CLOCK_MONOTONIC);
1433 }
1434
1435 /* reload requested, HUP signal received, rules changed, builtin changed */
1436 if (reload) {
1437 worker_kill(udev);
1438 rules = udev_rules_unref(rules);
1439 udev_builtin_exit(udev);
1440 reload = false;
1441 }
1442
1443 /* event has finished */
1444 if (is_worker)
1445 worker_returned(fd_worker);
1446
1447 if (is_netlink) {
1448 struct udev_device *dev;
1449
1450 dev = udev_monitor_receive_device(monitor);
1451 if (dev != NULL) {
1452 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1453 if (event_queue_insert(dev) < 0)
1454 udev_device_unref(dev);
1455 }
1456 }
1457
1458 /* start new events */
1459 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1460 udev_builtin_init(udev);
1461 if (rules == NULL)
1462 rules = udev_rules_new(udev, resolve_names);
1463 if (rules != NULL)
1464 event_queue_start(udev);
1465 }
1466
1467 if (is_signal) {
1468 struct signalfd_siginfo fdsi;
1469 ssize_t size;
1470
1471 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1472 if (size == sizeof(struct signalfd_siginfo))
1473 handle_signal(udev, fdsi.ssi_signo);
1474 }
1475
1476 /* we are shutting down, the events below are not handled anymore */
1477 if (udev_exit)
1478 continue;
1479
1480 /* device node watch */
1481 if (is_inotify)
1482 handle_inotify(udev);
1483
1484 /*
1485 * This needs to be after the inotify handling, to make sure,
1486 * that the ping is send back after the possibly generated
1487 * "change" events by the inotify device node watch.
1488 *
1489 * A single time we may receive a client connection which we need to
1490 * keep open to block the client. It will be closed right before we
1491 * exit.
1492 */
1493 if (is_ctrl)
1494 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1495 }
1496
1497 rc = EXIT_SUCCESS;
1498 exit:
1499 udev_ctrl_cleanup(udev_ctrl);
1500 unlink("/run/udev/queue");
1501 exit_daemonize:
1502 if (fd_ep >= 0)
1503 close(fd_ep);
1504 worker_list_cleanup(udev);
1505 event_queue_cleanup(udev, EVENT_UNDEF);
1506 udev_rules_unref(rules);
1507 udev_builtin_exit(udev);
1508 if (fd_signal >= 0)
1509 close(fd_signal);
1510 if (worker_watch[READ_END] >= 0)
1511 close(worker_watch[READ_END]);
1512 if (worker_watch[WRITE_END] >= 0)
1513 close(worker_watch[WRITE_END]);
1514 udev_monitor_unref(monitor);
1515 udev_ctrl_connection_unref(ctrl_conn);
1516 udev_ctrl_unref(udev_ctrl);
1517 label_finish();
1518 udev_unref(udev);
1519 log_close();
1520 return rc;
1521 }
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