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udev: limit minimum worker count to 16
[thirdparty/systemd.git] / src / udev / udevd.c
1 /*
2 * Copyright (C) 2004-2012 Kay Sievers <kay.sievers@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/time.h>
35 #include <sys/prctl.h>
36 #include <sys/socket.h>
37 #include <sys/un.h>
38 #include <sys/signalfd.h>
39 #include <sys/epoll.h>
40 #include <sys/poll.h>
41 #include <sys/wait.h>
42 #include <sys/stat.h>
43 #include <sys/ioctl.h>
44 #include <sys/inotify.h>
45 #include <sys/utsname.h>
46
47 #include "udev.h"
48 #include "sd-daemon.h"
49 #include "cgroup-util.h"
50 #include "dev-setup.h"
51
52 static bool debug;
53
54 void udev_main_log(struct udev *udev, int priority,
55 const char *file, int line, const char *fn,
56 const char *format, va_list args)
57 {
58 log_metav(priority, file, line, fn, format, args);
59 }
60
61 static struct udev_rules *rules;
62 static struct udev_queue_export *udev_queue_export;
63 static struct udev_ctrl *udev_ctrl;
64 static struct udev_monitor *monitor;
65 static int worker_watch[2] = { -1, -1 };
66 static int fd_signal = -1;
67 static int fd_ep = -1;
68 static int fd_inotify = -1;
69 static bool stop_exec_queue;
70 static bool reload;
71 static int children;
72 static int children_max;
73 static int exec_delay;
74 static sigset_t sigmask_orig;
75 static UDEV_LIST(event_list);
76 static UDEV_LIST(worker_list);
77 char *udev_cgroup;
78 static bool udev_exit;
79
80 enum event_state {
81 EVENT_UNDEF,
82 EVENT_QUEUED,
83 EVENT_RUNNING,
84 };
85
86 struct event {
87 struct udev_list_node node;
88 struct udev *udev;
89 struct udev_device *dev;
90 enum event_state state;
91 int exitcode;
92 unsigned long long int delaying_seqnum;
93 unsigned long long int seqnum;
94 const char *devpath;
95 size_t devpath_len;
96 const char *devpath_old;
97 dev_t devnum;
98 bool is_block;
99 int ifindex;
100 };
101
102 static inline struct event *node_to_event(struct udev_list_node *node)
103 {
104 return container_of(node, struct event, node);
105 }
106
107 static void event_queue_cleanup(struct udev *udev, enum event_state type);
108
109 enum worker_state {
110 WORKER_UNDEF,
111 WORKER_RUNNING,
112 WORKER_IDLE,
113 WORKER_KILLED,
114 };
115
116 struct worker {
117 struct udev_list_node node;
118 struct udev *udev;
119 int refcount;
120 pid_t pid;
121 struct udev_monitor *monitor;
122 enum worker_state state;
123 struct event *event;
124 unsigned long long event_start_usec;
125 };
126
127 /* passed from worker to main process */
128 struct worker_message {
129 pid_t pid;
130 int exitcode;
131 };
132
133 static inline struct worker *node_to_worker(struct udev_list_node *node)
134 {
135 return container_of(node, struct worker, node);
136 }
137
138 static void event_queue_delete(struct event *event, bool export)
139 {
140 udev_list_node_remove(&event->node);
141
142 if (export) {
143 udev_queue_export_device_finished(udev_queue_export, event->dev);
144 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode);
145 }
146 udev_device_unref(event->dev);
147 free(event);
148 }
149
150 static struct worker *worker_ref(struct worker *worker)
151 {
152 worker->refcount++;
153 return worker;
154 }
155
156 static void worker_cleanup(struct worker *worker)
157 {
158 udev_list_node_remove(&worker->node);
159 udev_monitor_unref(worker->monitor);
160 children--;
161 free(worker);
162 }
163
164 static void worker_unref(struct worker *worker)
165 {
166 worker->refcount--;
167 if (worker->refcount > 0)
168 return;
169 log_debug("worker [%u] cleaned up\n", worker->pid);
170 worker_cleanup(worker);
171 }
172
173 static void worker_list_cleanup(struct udev *udev)
174 {
175 struct udev_list_node *loop, *tmp;
176
177 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
178 struct worker *worker = node_to_worker(loop);
179
180 worker_cleanup(worker);
181 }
182 }
183
184 static void worker_new(struct event *event)
185 {
186 struct udev *udev = event->udev;
187 struct worker *worker;
188 struct udev_monitor *worker_monitor;
189 pid_t pid;
190
191 /* listen for new events */
192 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
193 if (worker_monitor == NULL)
194 return;
195 /* allow the main daemon netlink address to send devices to the worker */
196 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
197 udev_monitor_enable_receiving(worker_monitor);
198
199 worker = calloc(1, sizeof(struct worker));
200 if (worker == NULL) {
201 udev_monitor_unref(worker_monitor);
202 return;
203 }
204 /* worker + event reference */
205 worker->refcount = 2;
206 worker->udev = udev;
207
208 pid = fork();
209 switch (pid) {
210 case 0: {
211 struct udev_device *dev = NULL;
212 int fd_monitor;
213 struct epoll_event ep_signal, ep_monitor;
214 sigset_t mask;
215 int rc = EXIT_SUCCESS;
216
217 /* take initial device from queue */
218 dev = event->dev;
219 event->dev = NULL;
220
221 free(worker);
222 worker_list_cleanup(udev);
223 event_queue_cleanup(udev, EVENT_UNDEF);
224 udev_queue_export_unref(udev_queue_export);
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\n");
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\n");
242 rc = 3;
243 goto out;
244 }
245
246 memset(&ep_signal, 0, 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 memset(&ep_monitor, 0, 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\n");
258 rc = 4;
259 goto out;
260 }
261
262 /* request TERM signal if parent exits */
263 prctl(PR_SET_PDEATHSIG, SIGTERM);
264
265 for (;;) {
266 struct udev_event *udev_event;
267 struct worker_message msg;
268 int err;
269
270 log_debug("seq %llu running\n", udev_device_get_seqnum(dev));
271 udev_event = udev_event_new(dev);
272 if (udev_event == NULL) {
273 rc = 5;
274 goto out;
275 }
276
277 /* needed for SIGCHLD/SIGTERM in spawn() */
278 udev_event->fd_signal = fd_signal;
279
280 if (exec_delay > 0)
281 udev_event->exec_delay = exec_delay;
282
283 /* apply rules, create node, symlinks */
284 err = udev_event_execute_rules(udev_event, rules, &sigmask_orig);
285
286 if (err == 0)
287 udev_event_execute_run(udev_event, &sigmask_orig);
288
289 /* apply/restore inotify watch */
290 if (err == 0 && udev_event->inotify_watch) {
291 udev_watch_begin(udev, dev);
292 udev_device_update_db(dev);
293 }
294
295 /* send processed event back to libudev listeners */
296 udev_monitor_send_device(worker_monitor, NULL, dev);
297
298 /* send udevd the result of the event execution */
299 memset(&msg, 0, sizeof(struct worker_message));
300 if (err != 0)
301 msg.exitcode = err;
302 msg.pid = getpid();
303 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
304
305 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err);
306
307 udev_device_unref(dev);
308 dev = NULL;
309
310 if (udev_event->sigterm) {
311 udev_event_unref(udev_event);
312 goto out;
313 }
314
315 udev_event_unref(udev_event);
316
317 /* wait for more device messages from main udevd, or term signal */
318 while (dev == NULL) {
319 struct epoll_event ev[4];
320 int fdcount;
321 int i;
322
323 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
324 if (fdcount < 0) {
325 if (errno == EINTR)
326 continue;
327 log_error("failed to poll: %m\n");
328 goto out;
329 }
330
331 for (i = 0; i < fdcount; i++) {
332 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
333 dev = udev_monitor_receive_device(worker_monitor);
334 break;
335 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
336 struct signalfd_siginfo fdsi;
337 ssize_t size;
338
339 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
340 if (size != sizeof(struct signalfd_siginfo))
341 continue;
342 switch (fdsi.ssi_signo) {
343 case SIGTERM:
344 goto out;
345 }
346 }
347 }
348 }
349 }
350 out:
351 udev_device_unref(dev);
352 if (fd_signal >= 0)
353 close(fd_signal);
354 if (fd_ep >= 0)
355 close(fd_ep);
356 close(fd_inotify);
357 close(worker_watch[WRITE_END]);
358 udev_rules_unref(rules);
359 udev_builtin_exit(udev);
360 udev_monitor_unref(worker_monitor);
361 udev_unref(udev);
362 log_close();
363 exit(rc);
364 }
365 case -1:
366 udev_monitor_unref(worker_monitor);
367 event->state = EVENT_QUEUED;
368 free(worker);
369 log_error("fork of child failed: %m\n");
370 break;
371 default:
372 /* close monitor, but keep address around */
373 udev_monitor_disconnect(worker_monitor);
374 worker->monitor = worker_monitor;
375 worker->pid = pid;
376 worker->state = WORKER_RUNNING;
377 worker->event_start_usec = now_usec();
378 worker->event = event;
379 event->state = EVENT_RUNNING;
380 udev_list_node_append(&worker->node, &worker_list);
381 children++;
382 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid);
383 break;
384 }
385 }
386
387 static void event_run(struct event *event)
388 {
389 struct udev_list_node *loop;
390
391 udev_list_node_foreach(loop, &worker_list) {
392 struct worker *worker = node_to_worker(loop);
393 ssize_t count;
394
395 if (worker->state != WORKER_IDLE)
396 continue;
397
398 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
399 if (count < 0) {
400 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count);
401 kill(worker->pid, SIGKILL);
402 worker->state = WORKER_KILLED;
403 continue;
404 }
405 worker_ref(worker);
406 worker->event = event;
407 worker->state = WORKER_RUNNING;
408 worker->event_start_usec = now_usec();
409 event->state = EVENT_RUNNING;
410 return;
411 }
412
413 if (children >= children_max) {
414 if (children_max > 1)
415 log_debug("maximum number (%i) of children reached\n", children);
416 return;
417 }
418
419 /* start new worker and pass initial device */
420 worker_new(event);
421 }
422
423 static int event_queue_insert(struct udev_device *dev)
424 {
425 struct event *event;
426
427 event = calloc(1, sizeof(struct event));
428 if (event == NULL)
429 return -1;
430
431 event->udev = udev_device_get_udev(dev);
432 event->dev = dev;
433 event->seqnum = udev_device_get_seqnum(dev);
434 event->devpath = udev_device_get_devpath(dev);
435 event->devpath_len = strlen(event->devpath);
436 event->devpath_old = udev_device_get_devpath_old(dev);
437 event->devnum = udev_device_get_devnum(dev);
438 event->is_block = (strcmp("block", udev_device_get_subsystem(dev)) == 0);
439 event->ifindex = udev_device_get_ifindex(dev);
440
441 udev_queue_export_device_queued(udev_queue_export, dev);
442 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev),
443 udev_device_get_action(dev), udev_device_get_subsystem(dev));
444
445 event->state = EVENT_QUEUED;
446 udev_list_node_append(&event->node, &event_list);
447 return 0;
448 }
449
450 static void worker_kill(struct udev *udev)
451 {
452 struct udev_list_node *loop;
453
454 udev_list_node_foreach(loop, &worker_list) {
455 struct worker *worker = node_to_worker(loop);
456
457 if (worker->state == WORKER_KILLED)
458 continue;
459
460 worker->state = WORKER_KILLED;
461 kill(worker->pid, SIGTERM);
462 }
463 }
464
465 /* lookup event for identical, parent, child device */
466 static bool is_devpath_busy(struct event *event)
467 {
468 struct udev_list_node *loop;
469 size_t common;
470
471 /* check if queue contains events we depend on */
472 udev_list_node_foreach(loop, &event_list) {
473 struct event *loop_event = node_to_event(loop);
474
475 /* we already found a later event, earlier can not block us, no need to check again */
476 if (loop_event->seqnum < event->delaying_seqnum)
477 continue;
478
479 /* event we checked earlier still exists, no need to check again */
480 if (loop_event->seqnum == event->delaying_seqnum)
481 return true;
482
483 /* found ourself, no later event can block us */
484 if (loop_event->seqnum >= event->seqnum)
485 break;
486
487 /* check major/minor */
488 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
489 return true;
490
491 /* check network device ifindex */
492 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
493 return true;
494
495 /* check our old name */
496 if (event->devpath_old != NULL && strcmp(loop_event->devpath, event->devpath_old) == 0) {
497 event->delaying_seqnum = loop_event->seqnum;
498 return true;
499 }
500
501 /* compare devpath */
502 common = MIN(loop_event->devpath_len, event->devpath_len);
503
504 /* one devpath is contained in the other? */
505 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
506 continue;
507
508 /* identical device event found */
509 if (loop_event->devpath_len == event->devpath_len) {
510 /* devices names might have changed/swapped in the meantime */
511 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
512 continue;
513 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
514 continue;
515 event->delaying_seqnum = loop_event->seqnum;
516 return true;
517 }
518
519 /* parent device event found */
520 if (event->devpath[common] == '/') {
521 event->delaying_seqnum = loop_event->seqnum;
522 return true;
523 }
524
525 /* child device event found */
526 if (loop_event->devpath[common] == '/') {
527 event->delaying_seqnum = loop_event->seqnum;
528 return true;
529 }
530
531 /* no matching device */
532 continue;
533 }
534
535 return false;
536 }
537
538 static void event_queue_start(struct udev *udev)
539 {
540 struct udev_list_node *loop;
541
542 udev_list_node_foreach(loop, &event_list) {
543 struct event *event = node_to_event(loop);
544
545 if (event->state != EVENT_QUEUED)
546 continue;
547
548 /* do not start event if parent or child event is still running */
549 if (is_devpath_busy(event))
550 continue;
551
552 event_run(event);
553 }
554 }
555
556 static void event_queue_cleanup(struct udev *udev, enum event_state match_type)
557 {
558 struct udev_list_node *loop, *tmp;
559
560 udev_list_node_foreach_safe(loop, tmp, &event_list) {
561 struct event *event = node_to_event(loop);
562
563 if (match_type != EVENT_UNDEF && match_type != event->state)
564 continue;
565
566 event_queue_delete(event, false);
567 }
568 }
569
570 static void worker_returned(int fd_worker)
571 {
572 for (;;) {
573 struct worker_message msg;
574 ssize_t size;
575 struct udev_list_node *loop;
576
577 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
578 if (size != sizeof(struct worker_message))
579 break;
580
581 /* lookup worker who sent the signal */
582 udev_list_node_foreach(loop, &worker_list) {
583 struct worker *worker = node_to_worker(loop);
584
585 if (worker->pid != msg.pid)
586 continue;
587
588 /* worker returned */
589 if (worker->event) {
590 worker->event->exitcode = msg.exitcode;
591 event_queue_delete(worker->event, true);
592 worker->event = NULL;
593 }
594 if (worker->state != WORKER_KILLED)
595 worker->state = WORKER_IDLE;
596 worker_unref(worker);
597 break;
598 }
599 }
600 }
601
602 /* receive the udevd message from userspace */
603 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl)
604 {
605 struct udev *udev = udev_ctrl_get_udev(uctrl);
606 struct udev_ctrl_connection *ctrl_conn;
607 struct udev_ctrl_msg *ctrl_msg = NULL;
608 const char *str;
609 int i;
610
611 ctrl_conn = udev_ctrl_get_connection(uctrl);
612 if (ctrl_conn == NULL)
613 goto out;
614
615 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
616 if (ctrl_msg == NULL)
617 goto out;
618
619 i = udev_ctrl_get_set_log_level(ctrl_msg);
620 if (i >= 0) {
621 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
622 log_set_max_level(i);
623 udev_set_log_priority(udev, i);
624 worker_kill(udev);
625 }
626
627 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
628 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
629 stop_exec_queue = true;
630 }
631
632 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
633 log_debug("udevd message (START_EXEC_QUEUE) received\n");
634 stop_exec_queue = false;
635 }
636
637 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
638 log_debug("udevd message (RELOAD) received\n");
639 reload = true;
640 }
641
642 str = udev_ctrl_get_set_env(ctrl_msg);
643 if (str != NULL) {
644 char *key;
645
646 key = strdup(str);
647 if (key != NULL) {
648 char *val;
649
650 val = strchr(key, '=');
651 if (val != NULL) {
652 val[0] = '\0';
653 val = &val[1];
654 if (val[0] == '\0') {
655 log_debug("udevd message (ENV) received, unset '%s'\n", key);
656 udev_add_property(udev, key, NULL);
657 } else {
658 log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val);
659 udev_add_property(udev, key, val);
660 }
661 } else {
662 log_error("wrong key format '%s'\n", key);
663 }
664 free(key);
665 }
666 worker_kill(udev);
667 }
668
669 i = udev_ctrl_get_set_children_max(ctrl_msg);
670 if (i >= 0) {
671 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i);
672 children_max = i;
673 }
674
675 if (udev_ctrl_get_ping(ctrl_msg) > 0)
676 log_debug("udevd message (SYNC) received\n");
677
678 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
679 log_debug("udevd message (EXIT) received\n");
680 udev_exit = true;
681 /* keep reference to block the client until we exit */
682 udev_ctrl_connection_ref(ctrl_conn);
683 }
684 out:
685 udev_ctrl_msg_unref(ctrl_msg);
686 return udev_ctrl_connection_unref(ctrl_conn);
687 }
688
689 /* read inotify messages */
690 static int handle_inotify(struct udev *udev)
691 {
692 int nbytes, pos;
693 char *buf;
694 struct inotify_event *ev;
695
696 if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0))
697 return 0;
698
699 buf = malloc(nbytes);
700 if (buf == NULL) {
701 log_error("error getting buffer for inotify\n");
702 return -1;
703 }
704
705 nbytes = read(fd_inotify, buf, nbytes);
706
707 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
708 struct udev_device *dev;
709
710 ev = (struct inotify_event *)(buf + pos);
711 dev = udev_watch_lookup(udev, ev->wd);
712 if (dev != NULL) {
713 log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev));
714 if (ev->mask & IN_CLOSE_WRITE) {
715 char filename[UTIL_PATH_SIZE];
716 int fd;
717
718 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev));
719 util_strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
720 fd = open(filename, O_WRONLY);
721 if (fd >= 0) {
722 if (write(fd, "change", 6) < 0)
723 log_debug("error writing uevent: %m\n");
724 close(fd);
725 }
726 }
727 if (ev->mask & IN_IGNORED)
728 udev_watch_end(udev, dev);
729
730 udev_device_unref(dev);
731 }
732
733 }
734
735 free(buf);
736 return 0;
737 }
738
739 static void handle_signal(struct udev *udev, int signo)
740 {
741 switch (signo) {
742 case SIGINT:
743 case SIGTERM:
744 udev_exit = true;
745 break;
746 case SIGCHLD:
747 for (;;) {
748 pid_t pid;
749 int status;
750 struct udev_list_node *loop, *tmp;
751
752 pid = waitpid(-1, &status, WNOHANG);
753 if (pid <= 0)
754 break;
755
756 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
757 struct worker *worker = node_to_worker(loop);
758
759 if (worker->pid != pid)
760 continue;
761 log_debug("worker [%u] exit\n", pid);
762
763 if (WIFEXITED(status)) {
764 if (WEXITSTATUS(status) != 0)
765 log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status));
766 } else if (WIFSIGNALED(status)) {
767 log_error("worker [%u] terminated by signal %i (%s)\n",
768 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
769 } else if (WIFSTOPPED(status)) {
770 log_error("worker [%u] stopped\n", pid);
771 } else if (WIFCONTINUED(status)) {
772 log_error("worker [%u] continued\n", pid);
773 } else {
774 log_error("worker [%u] exit with status 0x%04x\n", pid, status);
775 }
776
777 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
778 if (worker->event) {
779 log_error("worker [%u] failed while handling '%s'\n",
780 pid, worker->event->devpath);
781 worker->event->exitcode = -32;
782 event_queue_delete(worker->event, true);
783 /* drop reference taken for state 'running' */
784 worker_unref(worker);
785 }
786 }
787 worker_unref(worker);
788 break;
789 }
790 }
791 break;
792 case SIGHUP:
793 reload = true;
794 break;
795 }
796 }
797
798 static void static_dev_create_from_modules(struct udev *udev)
799 {
800 struct utsname kernel;
801 char modules[UTIL_PATH_SIZE];
802 char buf[4096];
803 FILE *f;
804
805 uname(&kernel);
806 util_strscpyl(modules, sizeof(modules), "/lib/modules/", kernel.release, "/modules.devname", NULL);
807 f = fopen(modules, "r");
808 if (f == NULL)
809 return;
810
811 while (fgets(buf, sizeof(buf), f) != NULL) {
812 char *s;
813 const char *modname;
814 const char *devname;
815 const char *devno;
816 int maj, min;
817 char type;
818 mode_t mode;
819 char filename[UTIL_PATH_SIZE];
820
821 if (buf[0] == '#')
822 continue;
823
824 modname = buf;
825 s = strchr(modname, ' ');
826 if (s == NULL)
827 continue;
828 s[0] = '\0';
829
830 devname = &s[1];
831 s = strchr(devname, ' ');
832 if (s == NULL)
833 continue;
834 s[0] = '\0';
835
836 devno = &s[1];
837 s = strchr(devno, ' ');
838 if (s == NULL)
839 s = strchr(devno, '\n');
840 if (s != NULL)
841 s[0] = '\0';
842 if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3)
843 continue;
844
845 if (type == 'c')
846 mode = S_IFCHR;
847 else if (type == 'b')
848 mode = S_IFBLK;
849 else
850 continue;
851
852 util_strscpyl(filename, sizeof(filename), "/dev/", devname, NULL);
853 mkdir_parents_label(filename, 0755);
854 label_context_set(filename, mode);
855 log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min);
856 if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST)
857 utimensat(AT_FDCWD, filename, NULL, 0);
858 label_context_clear();
859 }
860
861 fclose(f);
862 }
863
864 static int mem_size_mb(void)
865 {
866 FILE *f;
867 char buf[4096];
868 long int memsize = -1;
869
870 f = fopen("/proc/meminfo", "r");
871 if (f == NULL)
872 return -1;
873
874 while (fgets(buf, sizeof(buf), f) != NULL) {
875 long int value;
876
877 if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
878 memsize = value / 1024;
879 break;
880 }
881 }
882
883 fclose(f);
884 return memsize;
885 }
886
887 static int convert_db(struct udev *udev)
888 {
889 char filename[UTIL_PATH_SIZE];
890 FILE *f;
891 struct udev_enumerate *udev_enumerate;
892 struct udev_list_entry *list_entry;
893
894 /* current database */
895 if (access("/run/udev/data", F_OK) >= 0)
896 return 0;
897
898 /* make sure we do not get here again */
899 mkdir_parents("/run/udev/data", 0755);
900 mkdir(filename, 0755);
901
902 /* old database */
903 util_strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL);
904 if (access(filename, F_OK) < 0)
905 return 0;
906
907 f = fopen("/dev/kmsg", "w");
908 if (f != NULL) {
909 fprintf(f, "<30>udevd[%u]: converting old udev database\n", getpid());
910 fclose(f);
911 }
912
913 udev_enumerate = udev_enumerate_new(udev);
914 if (udev_enumerate == NULL)
915 return -1;
916 udev_enumerate_scan_devices(udev_enumerate);
917 udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
918 struct udev_device *device;
919
920 device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
921 if (device == NULL)
922 continue;
923
924 /* try to find the old database for devices without a current one */
925 if (udev_device_read_db(device, NULL) < 0) {
926 bool have_db;
927 const char *id;
928 struct stat stats;
929 char devpath[UTIL_PATH_SIZE];
930 char from[UTIL_PATH_SIZE];
931
932 have_db = false;
933
934 /* find database in old location */
935 id = udev_device_get_id_filename(device);
936 util_strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL);
937 if (lstat(from, &stats) == 0) {
938 if (!have_db) {
939 udev_device_read_db(device, from);
940 have_db = true;
941 }
942 unlink(from);
943 }
944
945 /* find old database with $subsys:$sysname name */
946 util_strscpyl(from, sizeof(from), "/dev/.udev/db/",
947 udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL);
948 if (lstat(from, &stats) == 0) {
949 if (!have_db) {
950 udev_device_read_db(device, from);
951 have_db = true;
952 }
953 unlink(from);
954 }
955
956 /* find old database with the encoded devpath name */
957 util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath));
958 util_strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL);
959 if (lstat(from, &stats) == 0) {
960 if (!have_db) {
961 udev_device_read_db(device, from);
962 have_db = true;
963 }
964 unlink(from);
965 }
966
967 /* write out new database */
968 if (have_db)
969 udev_device_update_db(device);
970 }
971 udev_device_unref(device);
972 }
973 udev_enumerate_unref(udev_enumerate);
974 return 0;
975 }
976
977 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink)
978 {
979 int ctrl = -1, netlink = -1;
980 int fd, n;
981
982 n = sd_listen_fds(true);
983 if (n <= 0)
984 return -1;
985
986 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
987 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
988 if (ctrl >= 0)
989 return -1;
990 ctrl = fd;
991 continue;
992 }
993
994 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
995 if (netlink >= 0)
996 return -1;
997 netlink = fd;
998 continue;
999 }
1000
1001 return -1;
1002 }
1003
1004 if (ctrl < 0 || netlink < 0)
1005 return -1;
1006
1007 log_debug("ctrl=%i netlink=%i\n", ctrl, netlink);
1008 *rctrl = ctrl;
1009 *rnetlink = netlink;
1010 return 0;
1011 }
1012
1013 int main(int argc, char *argv[])
1014 {
1015 struct udev *udev;
1016 FILE *f;
1017 sigset_t mask;
1018 int daemonize = false;
1019 int resolve_names = 1;
1020 static const struct option options[] = {
1021 { "daemon", no_argument, NULL, 'd' },
1022 { "debug", no_argument, NULL, 'D' },
1023 { "children-max", required_argument, NULL, 'c' },
1024 { "exec-delay", required_argument, NULL, 'e' },
1025 { "resolve-names", required_argument, NULL, 'N' },
1026 { "help", no_argument, NULL, 'h' },
1027 { "version", no_argument, NULL, 'V' },
1028 {}
1029 };
1030 int fd_ctrl = -1;
1031 int fd_netlink = -1;
1032 int fd_worker = -1;
1033 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1034 struct udev_ctrl_connection *ctrl_conn = NULL;
1035 int rc = 1;
1036
1037 udev = udev_new();
1038 if (udev == NULL)
1039 goto exit;
1040
1041 log_open();
1042 log_parse_environment();
1043 udev_set_log_fn(udev, udev_main_log);
1044 log_debug("version %s\n", VERSION);
1045 label_init("/dev");
1046
1047 for (;;) {
1048 int option;
1049
1050 option = getopt_long(argc, argv, "c:deDtN:hV", options, NULL);
1051 if (option == -1)
1052 break;
1053
1054 switch (option) {
1055 case 'd':
1056 daemonize = true;
1057 break;
1058 case 'c':
1059 children_max = strtoul(optarg, NULL, 0);
1060 break;
1061 case 'e':
1062 exec_delay = strtoul(optarg, NULL, 0);
1063 break;
1064 case 'D':
1065 debug = true;
1066 log_set_max_level(LOG_DEBUG);
1067 udev_set_log_priority(udev, LOG_INFO);
1068 break;
1069 case 'N':
1070 if (strcmp (optarg, "early") == 0) {
1071 resolve_names = 1;
1072 } else if (strcmp (optarg, "late") == 0) {
1073 resolve_names = 0;
1074 } else if (strcmp (optarg, "never") == 0) {
1075 resolve_names = -1;
1076 } else {
1077 fprintf(stderr, "resolve-names must be early, late or never\n");
1078 log_error("resolve-names must be early, late or never\n");
1079 goto exit;
1080 }
1081 break;
1082 case 'h':
1083 printf("Usage: udevd OPTIONS\n"
1084 " --daemon\n"
1085 " --debug\n"
1086 " --children-max=<maximum number of workers>\n"
1087 " --exec-delay=<seconds to wait before executing RUN=>\n"
1088 " --resolve-names=early|late|never\n"
1089 " --version\n"
1090 " --help\n"
1091 "\n");
1092 goto exit;
1093 case 'V':
1094 printf("%s\n", VERSION);
1095 goto exit;
1096 default:
1097 goto exit;
1098 }
1099 }
1100
1101 /*
1102 * read the kernel commandline, in case we need to get into debug mode
1103 * udev.log-priority=<level> syslog priority
1104 * udev.children-max=<number of workers> events are fully serialized if set to 1
1105 *
1106 */
1107 f = fopen("/proc/cmdline", "r");
1108 if (f != NULL) {
1109 char cmdline[4096];
1110
1111 if (fgets(cmdline, sizeof(cmdline), f) != NULL) {
1112 char *pos;
1113
1114 pos = strstr(cmdline, "udev.log-priority=");
1115 if (pos != NULL) {
1116 pos += strlen("udev.log-priority=");
1117 udev_set_log_priority(udev, util_log_priority(pos));
1118 }
1119
1120 pos = strstr(cmdline, "udev.children-max=");
1121 if (pos != NULL) {
1122 pos += strlen("udev.children-max=");
1123 children_max = strtoul(pos, NULL, 0);
1124 }
1125
1126 pos = strstr(cmdline, "udev.exec-delay=");
1127 if (pos != NULL) {
1128 pos += strlen("udev.exec-delay=");
1129 exec_delay = strtoul(pos, NULL, 0);
1130 }
1131 }
1132 fclose(f);
1133 }
1134
1135 if (getuid() != 0) {
1136 fprintf(stderr, "root privileges required\n");
1137 log_error("root privileges required\n");
1138 goto exit;
1139 }
1140
1141 /* set umask before creating any file/directory */
1142 chdir("/");
1143 umask(022);
1144
1145 mkdir("/run/udev", 0755);
1146
1147 dev_setup();
1148 static_dev_create_from_modules(udev);
1149
1150 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1151 if (daemonize) {
1152 int fd;
1153
1154 fd = open("/dev/null", O_RDWR);
1155 if (fd >= 0) {
1156 if (write(STDOUT_FILENO, 0, 0) < 0)
1157 dup2(fd, STDOUT_FILENO);
1158 if (write(STDERR_FILENO, 0, 0) < 0)
1159 dup2(fd, STDERR_FILENO);
1160 if (fd > STDERR_FILENO)
1161 close(fd);
1162 } else {
1163 fprintf(stderr, "cannot open /dev/null\n");
1164 log_error("cannot open /dev/null\n");
1165 }
1166 }
1167
1168 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1169 /* get control and netlink socket from from systemd */
1170 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1171 if (udev_ctrl == NULL) {
1172 log_error("error taking over udev control socket");
1173 rc = 1;
1174 goto exit;
1175 }
1176
1177 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1178 if (monitor == NULL) {
1179 log_error("error taking over netlink socket\n");
1180 rc = 3;
1181 goto exit;
1182 }
1183
1184 /* get our own cgroup, we regularly kill everything udev has left behind */
1185 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1186 udev_cgroup = NULL;
1187 } else {
1188 /* open control and netlink socket */
1189 udev_ctrl = udev_ctrl_new(udev);
1190 if (udev_ctrl == NULL) {
1191 fprintf(stderr, "error initializing udev control socket");
1192 log_error("error initializing udev control socket");
1193 rc = 1;
1194 goto exit;
1195 }
1196 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1197
1198 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1199 if (monitor == NULL) {
1200 fprintf(stderr, "error initializing netlink socket\n");
1201 log_error("error initializing netlink socket\n");
1202 rc = 3;
1203 goto exit;
1204 }
1205 fd_netlink = udev_monitor_get_fd(monitor);
1206 }
1207
1208 if (udev_monitor_enable_receiving(monitor) < 0) {
1209 fprintf(stderr, "error binding netlink socket\n");
1210 log_error("error binding netlink socket\n");
1211 rc = 3;
1212 goto exit;
1213 }
1214
1215 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1216 fprintf(stderr, "error binding udev control socket\n");
1217 log_error("error binding udev control socket\n");
1218 rc = 1;
1219 goto exit;
1220 }
1221
1222 udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024);
1223
1224 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1225 udev_queue_export = udev_queue_export_new(udev);
1226 if (udev_queue_export == NULL) {
1227 log_error("error creating queue file\n");
1228 goto exit;
1229 }
1230
1231 if (daemonize) {
1232 pid_t pid;
1233 int fd;
1234
1235 pid = fork();
1236 switch (pid) {
1237 case 0:
1238 break;
1239 case -1:
1240 log_error("fork of daemon failed: %m\n");
1241 rc = 4;
1242 goto exit;
1243 default:
1244 rc = EXIT_SUCCESS;
1245 goto exit_daemonize;
1246 }
1247
1248 setsid();
1249
1250 fd = open("/proc/self/oom_score_adj", O_RDWR|O_CLOEXEC);
1251 if (fd >= 0) {
1252 write(fd, "-1000", 5);
1253 close(fd);
1254 }
1255 } else {
1256 sd_notify(1, "READY=1");
1257 }
1258
1259 f = fopen("/dev/kmsg", "w");
1260 if (f != NULL) {
1261 fprintf(f, "<30>udevd[%u]: starting version " VERSION "\n", getpid());
1262 fclose(f);
1263 }
1264
1265 if (!debug) {
1266 int fd;
1267
1268 fd = open("/dev/null", O_RDWR);
1269 if (fd >= 0) {
1270 dup2(fd, STDIN_FILENO);
1271 dup2(fd, STDOUT_FILENO);
1272 dup2(fd, STDERR_FILENO);
1273 close(fd);
1274 }
1275 }
1276
1277 fd_inotify = udev_watch_init(udev);
1278 if (fd_inotify < 0) {
1279 fprintf(stderr, "error initializing inotify\n");
1280 log_error("error initializing inotify\n");
1281 rc = 4;
1282 goto exit;
1283 }
1284 udev_watch_restore(udev);
1285
1286 /* block and listen to all signals on signalfd */
1287 sigfillset(&mask);
1288 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1289 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1290 if (fd_signal < 0) {
1291 fprintf(stderr, "error creating signalfd\n");
1292 log_error("error creating signalfd\n");
1293 rc = 5;
1294 goto exit;
1295 }
1296
1297 /* unnamed socket from workers to the main daemon */
1298 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1299 fprintf(stderr, "error creating socketpair\n");
1300 log_error("error creating socketpair\n");
1301 rc = 6;
1302 goto exit;
1303 }
1304 fd_worker = worker_watch[READ_END];
1305
1306 udev_builtin_init(udev);
1307
1308 rules = udev_rules_new(udev, resolve_names);
1309 if (rules == NULL) {
1310 log_error("error reading rules\n");
1311 goto exit;
1312 }
1313
1314 memset(&ep_ctrl, 0, sizeof(struct epoll_event));
1315 ep_ctrl.events = EPOLLIN;
1316 ep_ctrl.data.fd = fd_ctrl;
1317
1318 memset(&ep_inotify, 0, sizeof(struct epoll_event));
1319 ep_inotify.events = EPOLLIN;
1320 ep_inotify.data.fd = fd_inotify;
1321
1322 memset(&ep_signal, 0, sizeof(struct epoll_event));
1323 ep_signal.events = EPOLLIN;
1324 ep_signal.data.fd = fd_signal;
1325
1326 memset(&ep_netlink, 0, sizeof(struct epoll_event));
1327 ep_netlink.events = EPOLLIN;
1328 ep_netlink.data.fd = fd_netlink;
1329
1330 memset(&ep_worker, 0, sizeof(struct epoll_event));
1331 ep_worker.events = EPOLLIN;
1332 ep_worker.data.fd = fd_worker;
1333
1334 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1335 if (fd_ep < 0) {
1336 log_error("error creating epoll fd: %m\n");
1337 goto exit;
1338 }
1339 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1340 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1341 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1342 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1343 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1344 log_error("fail to add fds to epoll: %m\n");
1345 goto exit;
1346 }
1347
1348 /* if needed, convert old database from earlier udev version */
1349 convert_db(udev);
1350
1351 if (children_max <= 0) {
1352 int memsize = mem_size_mb();
1353
1354 /* set value depending on the amount of RAM */
1355 if (memsize > 0)
1356 children_max = 16 + (memsize / 8);
1357 else
1358 children_max = 16;
1359 }
1360 log_debug("set children_max to %u\n", children_max);
1361
1362 udev_rules_apply_static_dev_perms(rules);
1363
1364 udev_list_node_init(&event_list);
1365 udev_list_node_init(&worker_list);
1366
1367 for (;;) {
1368 static unsigned long long last_usec;
1369 struct epoll_event ev[8];
1370 int fdcount;
1371 int timeout;
1372 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1373 int i;
1374
1375 if (udev_exit) {
1376 /* close sources of new events and discard buffered events */
1377 if (fd_ctrl >= 0) {
1378 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1379 fd_ctrl = -1;
1380 }
1381 if (monitor != NULL) {
1382 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1383 udev_monitor_unref(monitor);
1384 monitor = NULL;
1385 }
1386 if (fd_inotify >= 0) {
1387 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1388 close(fd_inotify);
1389 fd_inotify = -1;
1390 }
1391
1392 /* discard queued events and kill workers */
1393 event_queue_cleanup(udev, EVENT_QUEUED);
1394 worker_kill(udev);
1395
1396 /* exit after all has cleaned up */
1397 if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list))
1398 break;
1399
1400 /* timeout at exit for workers to finish */
1401 timeout = 30 * 1000;
1402 } else if (udev_list_node_is_empty(&event_list) && !children) {
1403 /* we are idle */
1404 timeout = -1;
1405
1406 /* cleanup possible left-over processes in our cgroup */
1407 if (udev_cgroup)
1408 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1409 } else {
1410 /* kill idle or hanging workers */
1411 timeout = 3 * 1000;
1412 }
1413 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1414 if (fdcount < 0)
1415 continue;
1416
1417 if (fdcount == 0) {
1418 struct udev_list_node *loop;
1419
1420 /* timeout */
1421 if (udev_exit) {
1422 log_error("timeout, giving up waiting for workers to finish\n");
1423 break;
1424 }
1425
1426 /* kill idle workers */
1427 if (udev_list_node_is_empty(&event_list)) {
1428 log_debug("cleanup idle workers\n");
1429 worker_kill(udev);
1430 }
1431
1432 /* check for hanging events */
1433 udev_list_node_foreach(loop, &worker_list) {
1434 struct worker *worker = node_to_worker(loop);
1435
1436 if (worker->state != WORKER_RUNNING)
1437 continue;
1438
1439 if ((now_usec() - worker->event_start_usec) > 30 * 1000 * 1000) {
1440 log_error("worker [%u] %s timeout; kill it\n", worker->pid,
1441 worker->event ? worker->event->devpath : "<idle>");
1442 kill(worker->pid, SIGKILL);
1443 worker->state = WORKER_KILLED;
1444 /* drop reference taken for state 'running' */
1445 worker_unref(worker);
1446 if (worker->event) {
1447 log_error("seq %llu '%s' killed\n",
1448 udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1449 worker->event->exitcode = -64;
1450 event_queue_delete(worker->event, true);
1451 worker->event = NULL;
1452 }
1453 }
1454 }
1455
1456 }
1457
1458 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1459 for (i = 0; i < fdcount; i++) {
1460 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1461 is_worker = true;
1462 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1463 is_netlink = true;
1464 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1465 is_signal = true;
1466 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1467 is_inotify = true;
1468 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1469 is_ctrl = true;
1470 }
1471
1472 /* check for changed config, every 3 seconds at most */
1473 if ((now_usec() - last_usec) > 3 * 1000 * 1000) {
1474 if (udev_rules_check_timestamp(rules))
1475 reload = true;
1476 if (udev_builtin_validate(udev))
1477 reload = true;
1478
1479 last_usec = now_usec();
1480 }
1481
1482 /* reload requested, HUP signal received, rules changed, builtin changed */
1483 if (reload) {
1484 worker_kill(udev);
1485 rules = udev_rules_unref(rules);
1486 udev_builtin_exit(udev);
1487 reload = 0;
1488 }
1489
1490 /* event has finished */
1491 if (is_worker)
1492 worker_returned(fd_worker);
1493
1494 if (is_netlink) {
1495 struct udev_device *dev;
1496
1497 dev = udev_monitor_receive_device(monitor);
1498 if (dev != NULL) {
1499 udev_device_set_usec_initialized(dev, now_usec());
1500 if (event_queue_insert(dev) < 0)
1501 udev_device_unref(dev);
1502 }
1503 }
1504
1505 /* start new events */
1506 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1507 if (rules == NULL)
1508 rules = udev_rules_new(udev, resolve_names);
1509 if (rules != NULL)
1510 event_queue_start(udev);
1511 }
1512
1513 if (is_signal) {
1514 struct signalfd_siginfo fdsi;
1515 ssize_t size;
1516
1517 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1518 if (size == sizeof(struct signalfd_siginfo))
1519 handle_signal(udev, fdsi.ssi_signo);
1520 }
1521
1522 /* we are shutting down, the events below are not handled anymore */
1523 if (udev_exit)
1524 continue;
1525
1526 /* device node watch */
1527 if (is_inotify)
1528 handle_inotify(udev);
1529
1530 /*
1531 * This needs to be after the inotify handling, to make sure,
1532 * that the ping is send back after the possibly generated
1533 * "change" events by the inotify device node watch.
1534 *
1535 * A single time we may receive a client connection which we need to
1536 * keep open to block the client. It will be closed right before we
1537 * exit.
1538 */
1539 if (is_ctrl)
1540 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1541 }
1542
1543 rc = EXIT_SUCCESS;
1544 exit:
1545 udev_queue_export_cleanup(udev_queue_export);
1546 udev_ctrl_cleanup(udev_ctrl);
1547 exit_daemonize:
1548 if (fd_ep >= 0)
1549 close(fd_ep);
1550 worker_list_cleanup(udev);
1551 event_queue_cleanup(udev, EVENT_UNDEF);
1552 udev_rules_unref(rules);
1553 udev_builtin_exit(udev);
1554 if (fd_signal >= 0)
1555 close(fd_signal);
1556 if (worker_watch[READ_END] >= 0)
1557 close(worker_watch[READ_END]);
1558 if (worker_watch[WRITE_END] >= 0)
1559 close(worker_watch[WRITE_END]);
1560 udev_monitor_unref(monitor);
1561 udev_queue_export_unref(udev_queue_export);
1562 udev_ctrl_connection_unref(ctrl_conn);
1563 udev_ctrl_unref(udev_ctrl);
1564 label_finish();
1565 udev_unref(udev);
1566 log_close();
1567 return rc;
1568 }
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