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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 "rtnl-util.h"
52 #include "sd-daemon.h"
53 #include "cgroup-util.h"
54 #include "dev-setup.h"
55 #include "fileio.h"
56
57 static struct udev_rules *rules;
58 static struct udev_ctrl *udev_ctrl;
59 static struct udev_monitor *monitor;
60 static int worker_watch[2] = { -1, -1 };
61 static int fd_signal = -1;
62 static int fd_ep = -1;
63 static int fd_inotify = -1;
64 static bool stop_exec_queue;
65 static bool reload;
66 static int children;
67 static bool arg_debug = false;
68 static int arg_daemonize = false;
69 static int arg_resolve_names = 1;
70 static int arg_children_max;
71 static int arg_exec_delay;
72 static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC;
73 static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3;
74 static sigset_t sigmask_orig;
75 static UDEV_LIST(event_list);
76 static UDEV_LIST(worker_list);
77 static char *udev_cgroup;
78 static struct udev_list properties_list;
79 static bool udev_exit;
80
81 enum event_state {
82 EVENT_UNDEF,
83 EVENT_QUEUED,
84 EVENT_RUNNING,
85 };
86
87 struct event {
88 struct udev_list_node node;
89 struct udev *udev;
90 struct udev_device *dev;
91 enum event_state state;
92 int exitcode;
93 unsigned long long int delaying_seqnum;
94 unsigned long long int seqnum;
95 const char *devpath;
96 size_t devpath_len;
97 const char *devpath_old;
98 dev_t devnum;
99 int ifindex;
100 bool is_block;
101 };
102
103 static inline struct event *node_to_event(struct udev_list_node *node) {
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 usec_t event_start_usec;
125 bool event_warned;
126 };
127
128 /* passed from worker to main process */
129 struct worker_message {
130 pid_t pid;
131 int exitcode;
132 };
133
134 static inline struct worker *node_to_worker(struct udev_list_node *node) {
135 return container_of(node, struct worker, node);
136 }
137
138 static void event_queue_delete(struct event *event) {
139 udev_list_node_remove(&event->node);
140 udev_device_unref(event->dev);
141 free(event);
142 }
143
144 static struct worker *worker_ref(struct worker *worker) {
145 worker->refcount++;
146 return worker;
147 }
148
149 static void worker_cleanup(struct worker *worker) {
150 udev_list_node_remove(&worker->node);
151 udev_monitor_unref(worker->monitor);
152 children--;
153 free(worker);
154 }
155
156 static void worker_unref(struct worker *worker) {
157 worker->refcount--;
158 if (worker->refcount > 0)
159 return;
160 log_debug("worker [%u] cleaned up", worker->pid);
161 worker_cleanup(worker);
162 }
163
164 static void worker_list_cleanup(struct udev *udev) {
165 struct udev_list_node *loop, *tmp;
166
167 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
168 struct worker *worker = node_to_worker(loop);
169
170 worker_cleanup(worker);
171 }
172 }
173
174 static void worker_new(struct event *event) {
175 struct udev *udev = event->udev;
176 struct worker *worker;
177 struct udev_monitor *worker_monitor;
178 pid_t pid;
179
180 /* listen for new events */
181 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
182 if (worker_monitor == NULL)
183 return;
184 /* allow the main daemon netlink address to send devices to the worker */
185 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
186 udev_monitor_enable_receiving(worker_monitor);
187
188 worker = new0(struct worker, 1);
189 if (worker == NULL) {
190 udev_monitor_unref(worker_monitor);
191 return;
192 }
193 /* worker + event reference */
194 worker->refcount = 2;
195 worker->udev = udev;
196
197 pid = fork();
198 switch (pid) {
199 case 0: {
200 struct udev_device *dev = NULL;
201 int fd_monitor;
202 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
203 struct epoll_event ep_signal, ep_monitor;
204 sigset_t mask;
205 int rc = EXIT_SUCCESS;
206
207 /* take initial device from queue */
208 dev = event->dev;
209 event->dev = NULL;
210
211 free(worker);
212 worker_list_cleanup(udev);
213 event_queue_cleanup(udev, EVENT_UNDEF);
214 udev_monitor_unref(monitor);
215 udev_ctrl_unref(udev_ctrl);
216 close(fd_signal);
217 close(fd_ep);
218 close(worker_watch[READ_END]);
219
220 sigfillset(&mask);
221 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
222 if (fd_signal < 0) {
223 log_error_errno(errno, "error creating signalfd %m");
224 rc = 2;
225 goto out;
226 }
227
228 fd_ep = epoll_create1(EPOLL_CLOEXEC);
229 if (fd_ep < 0) {
230 log_error_errno(errno, "error creating epoll fd: %m");
231 rc = 3;
232 goto out;
233 }
234
235 memzero(&ep_signal, sizeof(struct epoll_event));
236 ep_signal.events = EPOLLIN;
237 ep_signal.data.fd = fd_signal;
238
239 fd_monitor = udev_monitor_get_fd(worker_monitor);
240 memzero(&ep_monitor, sizeof(struct epoll_event));
241 ep_monitor.events = EPOLLIN;
242 ep_monitor.data.fd = fd_monitor;
243
244 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
245 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
246 log_error_errno(errno, "fail to add fds to epoll: %m");
247 rc = 4;
248 goto out;
249 }
250
251 /* request TERM signal if parent exits */
252 prctl(PR_SET_PDEATHSIG, SIGTERM);
253
254 /* reset OOM score, we only protect the main daemon */
255 write_string_file("/proc/self/oom_score_adj", "0");
256
257 for (;;) {
258 struct udev_event *udev_event;
259 struct worker_message msg;
260 int fd_lock = -1;
261 int err = 0;
262
263 log_debug("seq %llu running", udev_device_get_seqnum(dev));
264 udev_event = udev_event_new(dev);
265 if (udev_event == NULL) {
266 rc = 5;
267 goto out;
268 }
269
270 /* needed for SIGCHLD/SIGTERM in spawn() */
271 udev_event->fd_signal = fd_signal;
272
273 if (arg_exec_delay > 0)
274 udev_event->exec_delay = arg_exec_delay;
275
276 /*
277 * Take a shared lock on the device node; this establishes
278 * a concept of device "ownership" to serialize device
279 * access. External processes holding an exclusive lock will
280 * cause udev to skip the event handling; in the case udev
281 * acquired the lock, the external process can block until
282 * udev has finished its event handling.
283 */
284 if (!streq_ptr(udev_device_get_action(dev), "remove") &&
285 streq_ptr("block", udev_device_get_subsystem(dev)) &&
286 !startswith(udev_device_get_sysname(dev), "dm-") &&
287 !startswith(udev_device_get_sysname(dev), "md")) {
288 struct udev_device *d = dev;
289
290 if (streq_ptr("partition", udev_device_get_devtype(d)))
291 d = udev_device_get_parent(d);
292
293 if (d) {
294 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
295 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
296 log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
297 err = -EWOULDBLOCK;
298 fd_lock = safe_close(fd_lock);
299 goto skip;
300 }
301 }
302 }
303
304 /* needed for renaming netifs */
305 udev_event->rtnl = rtnl;
306
307 /* apply rules, create node, symlinks */
308 udev_event_execute_rules(udev_event,
309 arg_event_timeout_usec, arg_event_timeout_warn_usec,
310 &properties_list,
311 rules,
312 &sigmask_orig);
313
314 udev_event_execute_run(udev_event,
315 arg_event_timeout_usec, arg_event_timeout_warn_usec,
316 &sigmask_orig);
317
318 /* in case rtnl was initialized */
319 rtnl = sd_rtnl_ref(udev_event->rtnl);
320
321 /* apply/restore inotify watch */
322 if (udev_event->inotify_watch) {
323 udev_watch_begin(udev, dev);
324 udev_device_update_db(dev);
325 }
326
327 safe_close(fd_lock);
328
329 /* send processed event back to libudev listeners */
330 udev_monitor_send_device(worker_monitor, NULL, dev);
331
332 skip:
333 /* send udevd the result of the event execution */
334 memzero(&msg, sizeof(struct worker_message));
335 msg.exitcode = err;
336 msg.pid = getpid();
337 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
338
339 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
340
341 udev_device_unref(dev);
342 dev = NULL;
343
344 if (udev_event->sigterm) {
345 udev_event_unref(udev_event);
346 goto out;
347 }
348
349 udev_event_unref(udev_event);
350
351 /* wait for more device messages from main udevd, or term signal */
352 while (dev == NULL) {
353 struct epoll_event ev[4];
354 int fdcount;
355 int i;
356
357 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
358 if (fdcount < 0) {
359 if (errno == EINTR)
360 continue;
361 log_error_errno(errno, "failed to poll: %m");
362 goto out;
363 }
364
365 for (i = 0; i < fdcount; i++) {
366 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
367 dev = udev_monitor_receive_device(worker_monitor);
368 break;
369 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
370 struct signalfd_siginfo fdsi;
371 ssize_t size;
372
373 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
374 if (size != sizeof(struct signalfd_siginfo))
375 continue;
376 switch (fdsi.ssi_signo) {
377 case SIGTERM:
378 goto out;
379 }
380 }
381 }
382 }
383 }
384 out:
385 udev_device_unref(dev);
386 safe_close(fd_signal);
387 safe_close(fd_ep);
388 close(fd_inotify);
389 close(worker_watch[WRITE_END]);
390 udev_rules_unref(rules);
391 udev_builtin_exit(udev);
392 udev_monitor_unref(worker_monitor);
393 udev_unref(udev);
394 log_close();
395 exit(rc);
396 }
397 case -1:
398 udev_monitor_unref(worker_monitor);
399 event->state = EVENT_QUEUED;
400 free(worker);
401 log_error_errno(errno, "fork of child failed: %m");
402 break;
403 default:
404 /* close monitor, but keep address around */
405 udev_monitor_disconnect(worker_monitor);
406 worker->monitor = worker_monitor;
407 worker->pid = pid;
408 worker->state = WORKER_RUNNING;
409 worker->event_start_usec = now(CLOCK_MONOTONIC);
410 worker->event_warned = false;
411 worker->event = event;
412 event->state = EVENT_RUNNING;
413 udev_list_node_append(&worker->node, &worker_list);
414 children++;
415 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
416 break;
417 }
418 }
419
420 static void event_run(struct event *event) {
421 struct udev_list_node *loop;
422
423 udev_list_node_foreach(loop, &worker_list) {
424 struct worker *worker = node_to_worker(loop);
425 ssize_t count;
426
427 if (worker->state != WORKER_IDLE)
428 continue;
429
430 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
431 if (count < 0) {
432 log_error_errno(errno, "worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
433 kill(worker->pid, SIGKILL);
434 worker->state = WORKER_KILLED;
435 continue;
436 }
437 worker_ref(worker);
438 worker->event = event;
439 worker->state = WORKER_RUNNING;
440 worker->event_start_usec = now(CLOCK_MONOTONIC);
441 worker->event_warned = false;
442 event->state = EVENT_RUNNING;
443 return;
444 }
445
446 if (children >= arg_children_max) {
447 if (arg_children_max > 1)
448 log_debug("maximum number (%i) of children reached", children);
449 return;
450 }
451
452 /* start new worker and pass initial device */
453 worker_new(event);
454 }
455
456 static int event_queue_insert(struct udev_device *dev) {
457 struct event *event;
458
459 event = new0(struct event, 1);
460 if (event == NULL)
461 return -1;
462
463 event->udev = udev_device_get_udev(dev);
464 event->dev = dev;
465 event->seqnum = udev_device_get_seqnum(dev);
466 event->devpath = udev_device_get_devpath(dev);
467 event->devpath_len = strlen(event->devpath);
468 event->devpath_old = udev_device_get_devpath_old(dev);
469 event->devnum = udev_device_get_devnum(dev);
470 event->is_block = streq("block", udev_device_get_subsystem(dev));
471 event->ifindex = udev_device_get_ifindex(dev);
472
473 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
474 udev_device_get_action(dev), udev_device_get_subsystem(dev));
475
476 event->state = EVENT_QUEUED;
477 udev_list_node_append(&event->node, &event_list);
478 return 0;
479 }
480
481 static void worker_kill(struct udev *udev) {
482 struct udev_list_node *loop;
483
484 udev_list_node_foreach(loop, &worker_list) {
485 struct worker *worker = node_to_worker(loop);
486
487 if (worker->state == WORKER_KILLED)
488 continue;
489
490 worker->state = WORKER_KILLED;
491 kill(worker->pid, SIGTERM);
492 }
493 }
494
495 /* lookup event for identical, parent, child device */
496 static bool is_devpath_busy(struct event *event) {
497 struct udev_list_node *loop;
498 size_t common;
499
500 /* check if queue contains events we depend on */
501 udev_list_node_foreach(loop, &event_list) {
502 struct event *loop_event = node_to_event(loop);
503
504 /* we already found a later event, earlier can not block us, no need to check again */
505 if (loop_event->seqnum < event->delaying_seqnum)
506 continue;
507
508 /* event we checked earlier still exists, no need to check again */
509 if (loop_event->seqnum == event->delaying_seqnum)
510 return true;
511
512 /* found ourself, no later event can block us */
513 if (loop_event->seqnum >= event->seqnum)
514 break;
515
516 /* check major/minor */
517 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
518 return true;
519
520 /* check network device ifindex */
521 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
522 return true;
523
524 /* check our old name */
525 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
526 event->delaying_seqnum = loop_event->seqnum;
527 return true;
528 }
529
530 /* compare devpath */
531 common = MIN(loop_event->devpath_len, event->devpath_len);
532
533 /* one devpath is contained in the other? */
534 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
535 continue;
536
537 /* identical device event found */
538 if (loop_event->devpath_len == event->devpath_len) {
539 /* devices names might have changed/swapped in the meantime */
540 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
541 continue;
542 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
543 continue;
544 event->delaying_seqnum = loop_event->seqnum;
545 return true;
546 }
547
548 /* parent device event found */
549 if (event->devpath[common] == '/') {
550 event->delaying_seqnum = loop_event->seqnum;
551 return true;
552 }
553
554 /* child device event found */
555 if (loop_event->devpath[common] == '/') {
556 event->delaying_seqnum = loop_event->seqnum;
557 return true;
558 }
559
560 /* no matching device */
561 continue;
562 }
563
564 return false;
565 }
566
567 static void event_queue_start(struct udev *udev) {
568 struct udev_list_node *loop;
569
570 udev_list_node_foreach(loop, &event_list) {
571 struct event *event = node_to_event(loop);
572
573 if (event->state != EVENT_QUEUED)
574 continue;
575
576 /* do not start event if parent or child event is still running */
577 if (is_devpath_busy(event))
578 continue;
579
580 event_run(event);
581 }
582 }
583
584 static void event_queue_cleanup(struct udev *udev, enum event_state match_type) {
585 struct udev_list_node *loop, *tmp;
586
587 udev_list_node_foreach_safe(loop, tmp, &event_list) {
588 struct event *event = node_to_event(loop);
589
590 if (match_type != EVENT_UNDEF && match_type != event->state)
591 continue;
592
593 event_queue_delete(event);
594 }
595 }
596
597 static void worker_returned(int fd_worker) {
598 for (;;) {
599 struct worker_message msg;
600 ssize_t size;
601 struct udev_list_node *loop;
602
603 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
604 if (size != sizeof(struct worker_message))
605 break;
606
607 /* lookup worker who sent the signal */
608 udev_list_node_foreach(loop, &worker_list) {
609 struct worker *worker = node_to_worker(loop);
610
611 if (worker->pid != msg.pid)
612 continue;
613
614 /* worker returned */
615 if (worker->event) {
616 worker->event->exitcode = msg.exitcode;
617 event_queue_delete(worker->event);
618 worker->event = NULL;
619 }
620 if (worker->state != WORKER_KILLED)
621 worker->state = WORKER_IDLE;
622 worker_unref(worker);
623 break;
624 }
625 }
626 }
627
628 /* receive the udevd message from userspace */
629 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) {
630 struct udev *udev = udev_ctrl_get_udev(uctrl);
631 struct udev_ctrl_connection *ctrl_conn;
632 struct udev_ctrl_msg *ctrl_msg = NULL;
633 const char *str;
634 int i;
635
636 ctrl_conn = udev_ctrl_get_connection(uctrl);
637 if (ctrl_conn == NULL)
638 goto out;
639
640 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
641 if (ctrl_msg == NULL)
642 goto out;
643
644 i = udev_ctrl_get_set_log_level(ctrl_msg);
645 if (i >= 0) {
646 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
647 log_set_max_level(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_list_entry_add(&properties_list, key, NULL);
681 } else {
682 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
683 udev_list_entry_add(&properties_list, 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 arg_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 command line, 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 const char *word, *state;
960 size_t l;
961 int r;
962
963 r = proc_cmdline(&line);
964 if (r < 0) {
965 log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
966 return;
967 }
968
969 FOREACH_WORD_QUOTED(word, l, line, state) {
970 char *s, *opt, *value;
971
972 s = strndup(word, 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 ((value = startswith(opt, "udev.log-priority="))) {
983 int prio;
984
985 prio = util_log_priority(value);
986 log_set_max_level(prio);
987 } else if ((value = startswith(opt, "udev.children-max="))) {
988 r = safe_atoi(value, &arg_children_max);
989 if (r < 0)
990 log_warning("Invalid udev.children-max ignored: %s", value);
991 } else if ((value = startswith(opt, "udev.exec-delay="))) {
992 r = safe_atoi(value, &arg_exec_delay);
993 if (r < 0)
994 log_warning("Invalid udev.exec-delay ignored: %s", value);
995 } else if ((value = startswith(opt, "udev.event-timeout="))) {
996 r = safe_atou64(value, &arg_event_timeout_usec);
997 if (r < 0) {
998 log_warning("Invalid udev.event-timeout ignored: %s", value);
999 break;
1000 }
1001 arg_event_timeout_usec *= USEC_PER_SEC;
1002 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1003 }
1004
1005 free(s);
1006 }
1007 }
1008
1009 static void help(void) {
1010 printf("%s [OPTIONS...]\n\n"
1011 "Manages devices.\n\n"
1012 " --daemon\n"
1013 " --debug\n"
1014 " --children-max=<maximum number of workers>\n"
1015 " --exec-delay=<seconds to wait before executing RUN=>\n"
1016 " --event-timeout=<seconds to wait before terminating an event>\n"
1017 " --resolve-names=early|late|never\n"
1018 " --version\n"
1019 " --help\n"
1020 , program_invocation_short_name);
1021 }
1022
1023 static int parse_argv(int argc, char *argv[]) {
1024 static const struct option options[] = {
1025 { "daemon", no_argument, NULL, 'd' },
1026 { "debug", no_argument, NULL, 'D' },
1027 { "children-max", required_argument, NULL, 'c' },
1028 { "exec-delay", required_argument, NULL, 'e' },
1029 { "event-timeout", required_argument, NULL, 't' },
1030 { "resolve-names", required_argument, NULL, 'N' },
1031 { "help", no_argument, NULL, 'h' },
1032 { "version", no_argument, NULL, 'V' },
1033 {}
1034 };
1035
1036 int c;
1037
1038 assert(argc >= 0);
1039 assert(argv);
1040
1041 while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) {
1042 int r;
1043
1044 switch (c) {
1045
1046 case 'd':
1047 arg_daemonize = true;
1048 break;
1049 case 'c':
1050 r = safe_atoi(optarg, &arg_children_max);
1051 if (r < 0)
1052 log_warning("Invalid --children-max ignored: %s", optarg);
1053 break;
1054 case 'e':
1055 r = safe_atoi(optarg, &arg_exec_delay);
1056 if (r < 0)
1057 log_warning("Invalid --exec-delay ignored: %s", optarg);
1058 break;
1059 case 't':
1060 r = safe_atou64(optarg, &arg_event_timeout_usec);
1061 if (r < 0)
1062 log_warning("Invalid --event-timeout ignored: %s", optarg);
1063 else {
1064 arg_event_timeout_usec *= USEC_PER_SEC;
1065 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1066 }
1067 break;
1068 case 'D':
1069 arg_debug = true;
1070 break;
1071 case 'N':
1072 if (streq(optarg, "early")) {
1073 arg_resolve_names = 1;
1074 } else if (streq(optarg, "late")) {
1075 arg_resolve_names = 0;
1076 } else if (streq(optarg, "never")) {
1077 arg_resolve_names = -1;
1078 } else {
1079 log_error("resolve-names must be early, late or never");
1080 return 0;
1081 }
1082 break;
1083 case 'h':
1084 help();
1085 return 0;
1086 case 'V':
1087 printf("%s\n", VERSION);
1088 return 0;
1089 case '?':
1090 return -EINVAL;
1091 default:
1092 assert_not_reached("Unhandled option");
1093
1094 }
1095 }
1096
1097 return 1;
1098 }
1099
1100 int main(int argc, char *argv[]) {
1101 struct udev *udev;
1102 sigset_t mask;
1103 int fd_ctrl = -1;
1104 int fd_netlink = -1;
1105 int fd_worker = -1;
1106 struct epoll_event ep_ctrl = { .events = EPOLLIN };
1107 struct epoll_event ep_inotify = { .events = EPOLLIN };
1108 struct epoll_event ep_signal = { .events = EPOLLIN };
1109 struct epoll_event ep_netlink = { .events = EPOLLIN };
1110 struct epoll_event ep_worker = { .events = EPOLLIN };
1111 struct udev_ctrl_connection *ctrl_conn = NULL;
1112 int rc = 1, r;
1113
1114 udev = udev_new();
1115 if (udev == NULL)
1116 goto exit;
1117
1118 log_set_target(LOG_TARGET_AUTO);
1119 log_parse_environment();
1120 log_open();
1121
1122 r = parse_argv(argc, argv);
1123 if (r <= 0)
1124 goto exit;
1125
1126 kernel_cmdline_options(udev);
1127
1128 if (arg_debug)
1129 log_set_max_level(LOG_DEBUG);
1130
1131 if (getuid() != 0) {
1132 log_error("root privileges required");
1133 goto exit;
1134 }
1135
1136 r = mac_selinux_init("/dev");
1137 if (r < 0) {
1138 log_error_errno(r, "could not initialize labelling: %m");
1139 goto exit;
1140 }
1141
1142 /* set umask before creating any file/directory */
1143 r = chdir("/");
1144 if (r < 0) {
1145 log_error_errno(errno, "could not change dir to /: %m");
1146 goto exit;
1147 }
1148
1149 umask(022);
1150
1151 udev_list_init(udev, &properties_list, true);
1152
1153 r = mkdir("/run/udev", 0755);
1154 if (r < 0 && errno != EEXIST) {
1155 log_error_errno(errno, "could not create /run/udev: %m");
1156 goto exit;
1157 }
1158
1159 dev_setup(NULL);
1160
1161 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1162 if (arg_daemonize) {
1163 int fd;
1164
1165 fd = open("/dev/null", O_RDWR);
1166 if (fd >= 0) {
1167 if (write(STDOUT_FILENO, 0, 0) < 0)
1168 dup2(fd, STDOUT_FILENO);
1169 if (write(STDERR_FILENO, 0, 0) < 0)
1170 dup2(fd, STDERR_FILENO);
1171 if (fd > STDERR_FILENO)
1172 close(fd);
1173 } else {
1174 log_error("cannot open /dev/null");
1175 }
1176 }
1177
1178 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1179 /* get control and netlink socket from systemd */
1180 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1181 if (udev_ctrl == NULL) {
1182 log_error("error taking over udev control socket");
1183 rc = 1;
1184 goto exit;
1185 }
1186
1187 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1188 if (monitor == NULL) {
1189 log_error("error taking over netlink socket");
1190 rc = 3;
1191 goto exit;
1192 }
1193
1194 /* get our own cgroup, we regularly kill everything udev has left behind */
1195 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1196 udev_cgroup = NULL;
1197 } else {
1198 /* open control and netlink socket */
1199 udev_ctrl = udev_ctrl_new(udev);
1200 if (udev_ctrl == NULL) {
1201 log_error("error initializing udev control socket");
1202 rc = 1;
1203 goto exit;
1204 }
1205 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1206
1207 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1208 if (monitor == NULL) {
1209 log_error("error initializing netlink socket");
1210 rc = 3;
1211 goto exit;
1212 }
1213 fd_netlink = udev_monitor_get_fd(monitor);
1214
1215 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1216 }
1217
1218 if (udev_monitor_enable_receiving(monitor) < 0) {
1219 log_error("error binding netlink socket");
1220 rc = 3;
1221 goto exit;
1222 }
1223
1224 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1225 log_error("error binding udev control socket");
1226 rc = 1;
1227 goto exit;
1228 }
1229
1230 log_info("starting version " VERSION);
1231
1232 udev_builtin_init(udev);
1233
1234 rules = udev_rules_new(udev, arg_resolve_names);
1235 if (rules == NULL) {
1236 log_error("error reading rules");
1237 goto exit;
1238 }
1239
1240 rc = udev_rules_apply_static_dev_perms(rules);
1241 if (rc < 0)
1242 log_error_errno(rc, "failed to apply permissions on static device nodes - %m");
1243
1244 if (arg_daemonize) {
1245 pid_t pid;
1246
1247 pid = fork();
1248 switch (pid) {
1249 case 0:
1250 break;
1251 case -1:
1252 log_error_errno(errno, "fork of daemon failed: %m");
1253 rc = 4;
1254 goto exit;
1255 default:
1256 rc = EXIT_SUCCESS;
1257 goto exit_daemonize;
1258 }
1259
1260 setsid();
1261
1262 write_string_file("/proc/self/oom_score_adj", "-1000");
1263 } else {
1264 sd_notify(1, "READY=1");
1265 }
1266
1267 if (arg_children_max <= 0) {
1268 cpu_set_t cpu_set;
1269
1270 arg_children_max = 8;
1271
1272 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1273 arg_children_max += CPU_COUNT(&cpu_set) * 2;
1274 }
1275 }
1276 log_debug("set children_max to %u", arg_children_max);
1277
1278 udev_list_node_init(&event_list);
1279 udev_list_node_init(&worker_list);
1280
1281 fd_inotify = udev_watch_init(udev);
1282 if (fd_inotify < 0) {
1283 log_error("error initializing inotify");
1284 rc = 4;
1285 goto exit;
1286 }
1287 udev_watch_restore(udev);
1288
1289 /* block and listen to all signals on signalfd */
1290 sigfillset(&mask);
1291 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1292 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1293 if (fd_signal < 0) {
1294 log_error("error creating signalfd");
1295 rc = 5;
1296 goto exit;
1297 }
1298
1299 /* unnamed socket from workers to the main daemon */
1300 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1301 log_error("error creating socketpair");
1302 rc = 6;
1303 goto exit;
1304 }
1305 fd_worker = worker_watch[READ_END];
1306
1307 ep_ctrl.data.fd = fd_ctrl;
1308 ep_inotify.data.fd = fd_inotify;
1309 ep_signal.data.fd = fd_signal;
1310 ep_netlink.data.fd = fd_netlink;
1311 ep_worker.data.fd = fd_worker;
1312
1313 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1314 if (fd_ep < 0) {
1315 log_error_errno(errno, "error creating epoll fd: %m");
1316 goto exit;
1317 }
1318 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1319 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1320 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1321 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1322 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1323 log_error_errno(errno, "fail to add fds to epoll: %m");
1324 goto exit;
1325 }
1326
1327 for (;;) {
1328 static usec_t last_usec;
1329 struct epoll_event ev[8];
1330 int fdcount;
1331 int timeout;
1332 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1333 int i;
1334
1335 if (udev_exit) {
1336 /* close sources of new events and discard buffered events */
1337 if (fd_ctrl >= 0) {
1338 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1339 fd_ctrl = -1;
1340 }
1341 if (monitor != NULL) {
1342 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1343 udev_monitor_unref(monitor);
1344 monitor = NULL;
1345 }
1346 if (fd_inotify >= 0) {
1347 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1348 close(fd_inotify);
1349 fd_inotify = -1;
1350 }
1351
1352 /* discard queued events and kill workers */
1353 event_queue_cleanup(udev, EVENT_QUEUED);
1354 worker_kill(udev);
1355
1356 /* exit after all has cleaned up */
1357 if (udev_list_node_is_empty(&event_list) && children == 0)
1358 break;
1359
1360 /* timeout at exit for workers to finish */
1361 timeout = 30 * MSEC_PER_SEC;
1362 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1363 /* we are idle */
1364 timeout = -1;
1365
1366 /* cleanup possible left-over processes in our cgroup */
1367 if (udev_cgroup)
1368 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1369 } else {
1370 /* kill idle or hanging workers */
1371 timeout = 3 * MSEC_PER_SEC;
1372 }
1373
1374 /* tell settle that we are busy or idle */
1375 if (!udev_list_node_is_empty(&event_list)) {
1376 int fd;
1377
1378 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1379 if (fd >= 0)
1380 close(fd);
1381 } else {
1382 unlink("/run/udev/queue");
1383 }
1384
1385 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1386 if (fdcount < 0)
1387 continue;
1388
1389 if (fdcount == 0) {
1390 struct udev_list_node *loop;
1391
1392 /* timeout */
1393 if (udev_exit) {
1394 log_error("timeout, giving up waiting for workers to finish");
1395 break;
1396 }
1397
1398 /* kill idle workers */
1399 if (udev_list_node_is_empty(&event_list)) {
1400 log_debug("cleanup idle workers");
1401 worker_kill(udev);
1402 }
1403
1404 /* check for hanging events */
1405 udev_list_node_foreach(loop, &worker_list) {
1406 struct worker *worker = node_to_worker(loop);
1407 usec_t ts;
1408
1409 if (worker->state != WORKER_RUNNING)
1410 continue;
1411
1412 ts = now(CLOCK_MONOTONIC);
1413
1414 if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) {
1415 if ((ts - worker->event_start_usec) > arg_event_timeout_usec) {
1416 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1417 kill(worker->pid, SIGKILL);
1418 worker->state = WORKER_KILLED;
1419
1420 /* drop reference taken for state 'running' */
1421 worker_unref(worker);
1422 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1423 worker->event->exitcode = -64;
1424 event_queue_delete(worker->event);
1425 worker->event = NULL;
1426 } else if (!worker->event_warned) {
1427 log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
1428 worker->event_warned = true;
1429 }
1430 }
1431 }
1432
1433 }
1434
1435 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1436 for (i = 0; i < fdcount; i++) {
1437 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1438 is_worker = true;
1439 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1440 is_netlink = true;
1441 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1442 is_signal = true;
1443 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1444 is_inotify = true;
1445 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1446 is_ctrl = true;
1447 }
1448
1449 /* check for changed config, every 3 seconds at most */
1450 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1451 if (udev_rules_check_timestamp(rules))
1452 reload = true;
1453 if (udev_builtin_validate(udev))
1454 reload = true;
1455
1456 last_usec = now(CLOCK_MONOTONIC);
1457 }
1458
1459 /* reload requested, HUP signal received, rules changed, builtin changed */
1460 if (reload) {
1461 worker_kill(udev);
1462 rules = udev_rules_unref(rules);
1463 udev_builtin_exit(udev);
1464 reload = false;
1465 }
1466
1467 /* event has finished */
1468 if (is_worker)
1469 worker_returned(fd_worker);
1470
1471 if (is_netlink) {
1472 struct udev_device *dev;
1473
1474 dev = udev_monitor_receive_device(monitor);
1475 if (dev != NULL) {
1476 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1477 if (event_queue_insert(dev) < 0)
1478 udev_device_unref(dev);
1479 }
1480 }
1481
1482 /* start new events */
1483 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1484 udev_builtin_init(udev);
1485 if (rules == NULL)
1486 rules = udev_rules_new(udev, arg_resolve_names);
1487 if (rules != NULL)
1488 event_queue_start(udev);
1489 }
1490
1491 if (is_signal) {
1492 struct signalfd_siginfo fdsi;
1493 ssize_t size;
1494
1495 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1496 if (size == sizeof(struct signalfd_siginfo))
1497 handle_signal(udev, fdsi.ssi_signo);
1498 }
1499
1500 /* we are shutting down, the events below are not handled anymore */
1501 if (udev_exit)
1502 continue;
1503
1504 /* device node watch */
1505 if (is_inotify)
1506 handle_inotify(udev);
1507
1508 /*
1509 * This needs to be after the inotify handling, to make sure,
1510 * that the ping is send back after the possibly generated
1511 * "change" events by the inotify device node watch.
1512 *
1513 * A single time we may receive a client connection which we need to
1514 * keep open to block the client. It will be closed right before we
1515 * exit.
1516 */
1517 if (is_ctrl)
1518 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1519 }
1520
1521 rc = EXIT_SUCCESS;
1522 exit:
1523 udev_ctrl_cleanup(udev_ctrl);
1524 unlink("/run/udev/queue");
1525 exit_daemonize:
1526 if (fd_ep >= 0)
1527 close(fd_ep);
1528 worker_list_cleanup(udev);
1529 event_queue_cleanup(udev, EVENT_UNDEF);
1530 udev_rules_unref(rules);
1531 udev_builtin_exit(udev);
1532 if (fd_signal >= 0)
1533 close(fd_signal);
1534 if (worker_watch[READ_END] >= 0)
1535 close(worker_watch[READ_END]);
1536 if (worker_watch[WRITE_END] >= 0)
1537 close(worker_watch[WRITE_END]);
1538 udev_monitor_unref(monitor);
1539 udev_ctrl_connection_unref(ctrl_conn);
1540 udev_ctrl_unref(udev_ctrl);
1541 udev_list_cleanup(&properties_list);
1542 mac_selinux_finish();
1543 udev_unref(udev);
1544 log_close();
1545 return rc;
1546 }
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