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udev: switch to systemd logging functions
[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 void udev_main_log(struct udev *udev, int priority,
58 const char *file, int line, const char *fn,
59 const char *format, va_list args) {
60 log_metav(priority, file, line, fn, format, args);
61 }
62
63 static struct udev_rules *rules;
64 static struct udev_ctrl *udev_ctrl;
65 static struct udev_monitor *monitor;
66 static int worker_watch[2] = { -1, -1 };
67 static int fd_signal = -1;
68 static int fd_ep = -1;
69 static int fd_inotify = -1;
70 static bool stop_exec_queue;
71 static bool reload;
72 static int children;
73 static bool arg_debug = false;
74 static int arg_daemonize = false;
75 static int arg_resolve_names = 1;
76 static int arg_children_max;
77 static int arg_exec_delay;
78 static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC;
79 static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3;
80 static sigset_t sigmask_orig;
81 static UDEV_LIST(event_list);
82 static UDEV_LIST(worker_list);
83 static char *udev_cgroup;
84 static bool udev_exit;
85
86 enum event_state {
87 EVENT_UNDEF,
88 EVENT_QUEUED,
89 EVENT_RUNNING,
90 };
91
92 struct event {
93 struct udev_list_node node;
94 struct udev *udev;
95 struct udev_device *dev;
96 enum event_state state;
97 int exitcode;
98 unsigned long long int delaying_seqnum;
99 unsigned long long int seqnum;
100 const char *devpath;
101 size_t devpath_len;
102 const char *devpath_old;
103 dev_t devnum;
104 int ifindex;
105 bool is_block;
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 bool event_warned;
131 };
132
133 /* passed from worker to main process */
134 struct worker_message {
135 pid_t pid;
136 int exitcode;
137 };
138
139 static inline struct worker *node_to_worker(struct udev_list_node *node) {
140 return container_of(node, struct worker, node);
141 }
142
143 static void event_queue_delete(struct event *event) {
144 udev_list_node_remove(&event->node);
145 udev_device_unref(event->dev);
146 free(event);
147 }
148
149 static struct worker *worker_ref(struct worker *worker) {
150 worker->refcount++;
151 return worker;
152 }
153
154 static void worker_cleanup(struct worker *worker) {
155 udev_list_node_remove(&worker->node);
156 udev_monitor_unref(worker->monitor);
157 children--;
158 free(worker);
159 }
160
161 static void worker_unref(struct worker *worker) {
162 worker->refcount--;
163 if (worker->refcount > 0)
164 return;
165 log_debug("worker [%u] cleaned up", worker->pid);
166 worker_cleanup(worker);
167 }
168
169 static void worker_list_cleanup(struct udev *udev) {
170 struct udev_list_node *loop, *tmp;
171
172 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
173 struct worker *worker = node_to_worker(loop);
174
175 worker_cleanup(worker);
176 }
177 }
178
179 static void worker_new(struct event *event) {
180 struct udev *udev = event->udev;
181 struct worker *worker;
182 struct udev_monitor *worker_monitor;
183 pid_t pid;
184
185 /* listen for new events */
186 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
187 if (worker_monitor == NULL)
188 return;
189 /* allow the main daemon netlink address to send devices to the worker */
190 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
191 udev_monitor_enable_receiving(worker_monitor);
192
193 worker = new0(struct worker, 1);
194 if (worker == NULL) {
195 udev_monitor_unref(worker_monitor);
196 return;
197 }
198 /* worker + event reference */
199 worker->refcount = 2;
200 worker->udev = udev;
201
202 pid = fork();
203 switch (pid) {
204 case 0: {
205 struct udev_device *dev = NULL;
206 int fd_monitor;
207 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
208 struct epoll_event ep_signal, ep_monitor;
209 sigset_t mask;
210 int rc = EXIT_SUCCESS;
211
212 /* take initial device from queue */
213 dev = event->dev;
214 event->dev = NULL;
215
216 free(worker);
217 worker_list_cleanup(udev);
218 event_queue_cleanup(udev, EVENT_UNDEF);
219 udev_monitor_unref(monitor);
220 udev_ctrl_unref(udev_ctrl);
221 close(fd_signal);
222 close(fd_ep);
223 close(worker_watch[READ_END]);
224
225 sigfillset(&mask);
226 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
227 if (fd_signal < 0) {
228 log_error("error creating signalfd %m");
229 rc = 2;
230 goto out;
231 }
232
233 fd_ep = epoll_create1(EPOLL_CLOEXEC);
234 if (fd_ep < 0) {
235 log_error("error creating epoll fd: %m");
236 rc = 3;
237 goto out;
238 }
239
240 memzero(&ep_signal, sizeof(struct epoll_event));
241 ep_signal.events = EPOLLIN;
242 ep_signal.data.fd = fd_signal;
243
244 fd_monitor = udev_monitor_get_fd(worker_monitor);
245 memzero(&ep_monitor, sizeof(struct epoll_event));
246 ep_monitor.events = EPOLLIN;
247 ep_monitor.data.fd = fd_monitor;
248
249 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
250 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
251 log_error("fail to add fds to epoll: %m");
252 rc = 4;
253 goto out;
254 }
255
256 /* request TERM signal if parent exits */
257 prctl(PR_SET_PDEATHSIG, SIGTERM);
258
259 /* reset OOM score, we only protect the main daemon */
260 write_string_file("/proc/self/oom_score_adj", "0");
261
262 for (;;) {
263 struct udev_event *udev_event;
264 struct worker_message msg;
265 int fd_lock = -1;
266 int err = 0;
267
268 log_debug("seq %llu running", udev_device_get_seqnum(dev));
269 udev_event = udev_event_new(dev);
270 if (udev_event == NULL) {
271 rc = 5;
272 goto out;
273 }
274
275 /* needed for SIGCHLD/SIGTERM in spawn() */
276 udev_event->fd_signal = fd_signal;
277
278 if (arg_exec_delay > 0)
279 udev_event->exec_delay = arg_exec_delay;
280
281 /*
282 * Take a shared lock on the device node; this establishes
283 * a concept of device "ownership" to serialize device
284 * access. External processes holding an exclusive lock will
285 * cause udev to skip the event handling; in the case udev
286 * acquired the lock, the external process can block until
287 * udev has finished its event handling.
288 */
289 if (!streq_ptr(udev_device_get_action(dev), "remove") &&
290 streq_ptr("block", udev_device_get_subsystem(dev)) &&
291 !startswith(udev_device_get_sysname(dev), "dm-") &&
292 !startswith(udev_device_get_sysname(dev), "md")) {
293 struct udev_device *d = dev;
294
295 if (streq_ptr("partition", udev_device_get_devtype(d)))
296 d = udev_device_get_parent(d);
297
298 if (d) {
299 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
300 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
301 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
302 err = -EWOULDBLOCK;
303 fd_lock = safe_close(fd_lock);
304 goto skip;
305 }
306 }
307 }
308
309 /* needed for renaming netifs */
310 udev_event->rtnl = rtnl;
311
312 /* apply rules, create node, symlinks */
313 udev_event_execute_rules(udev_event, arg_event_timeout_usec, arg_event_timeout_warn_usec, rules, &sigmask_orig);
314
315 udev_event_execute_run(udev_event, arg_event_timeout_usec, arg_event_timeout_warn_usec, &sigmask_orig);
316
317 /* in case rtnl was initialized */
318 rtnl = sd_rtnl_ref(udev_event->rtnl);
319
320 /* apply/restore inotify watch */
321 if (udev_event->inotify_watch) {
322 udev_watch_begin(udev, dev);
323 udev_device_update_db(dev);
324 }
325
326 safe_close(fd_lock);
327
328 /* send processed event back to libudev listeners */
329 udev_monitor_send_device(worker_monitor, NULL, dev);
330
331 skip:
332 /* send udevd the result of the event execution */
333 memzero(&msg, sizeof(struct worker_message));
334 msg.exitcode = err;
335 msg.pid = getpid();
336 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
337
338 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
339
340 udev_device_unref(dev);
341 dev = NULL;
342
343 if (udev_event->sigterm) {
344 udev_event_unref(udev_event);
345 goto out;
346 }
347
348 udev_event_unref(udev_event);
349
350 /* wait for more device messages from main udevd, or term signal */
351 while (dev == NULL) {
352 struct epoll_event ev[4];
353 int fdcount;
354 int i;
355
356 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
357 if (fdcount < 0) {
358 if (errno == EINTR)
359 continue;
360 log_error("failed to poll: %m");
361 goto out;
362 }
363
364 for (i = 0; i < fdcount; i++) {
365 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
366 dev = udev_monitor_receive_device(worker_monitor);
367 break;
368 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
369 struct signalfd_siginfo fdsi;
370 ssize_t size;
371
372 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
373 if (size != sizeof(struct signalfd_siginfo))
374 continue;
375 switch (fdsi.ssi_signo) {
376 case SIGTERM:
377 goto out;
378 }
379 }
380 }
381 }
382 }
383 out:
384 udev_device_unref(dev);
385 safe_close(fd_signal);
386 safe_close(fd_ep);
387 close(fd_inotify);
388 close(worker_watch[WRITE_END]);
389 udev_rules_unref(rules);
390 udev_builtin_exit(udev);
391 udev_monitor_unref(worker_monitor);
392 udev_unref(udev);
393 log_close();
394 exit(rc);
395 }
396 case -1:
397 udev_monitor_unref(worker_monitor);
398 event->state = EVENT_QUEUED;
399 free(worker);
400 log_error("fork of child failed: %m");
401 break;
402 default:
403 /* close monitor, but keep address around */
404 udev_monitor_disconnect(worker_monitor);
405 worker->monitor = worker_monitor;
406 worker->pid = pid;
407 worker->state = WORKER_RUNNING;
408 worker->event_start_usec = now(CLOCK_MONOTONIC);
409 worker->event_warned = false;
410 worker->event = event;
411 event->state = EVENT_RUNNING;
412 udev_list_node_append(&worker->node, &worker_list);
413 children++;
414 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
415 break;
416 }
417 }
418
419 static void event_run(struct event *event) {
420 struct udev_list_node *loop;
421
422 udev_list_node_foreach(loop, &worker_list) {
423 struct worker *worker = node_to_worker(loop);
424 ssize_t count;
425
426 if (worker->state != WORKER_IDLE)
427 continue;
428
429 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
430 if (count < 0) {
431 log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
432 kill(worker->pid, SIGKILL);
433 worker->state = WORKER_KILLED;
434 continue;
435 }
436 worker_ref(worker);
437 worker->event = event;
438 worker->state = WORKER_RUNNING;
439 worker->event_start_usec = now(CLOCK_MONOTONIC);
440 worker->event_warned = false;
441 event->state = EVENT_RUNNING;
442 return;
443 }
444
445 if (children >= arg_children_max) {
446 if (arg_children_max > 1)
447 log_debug("maximum number (%i) of children reached", children);
448 return;
449 }
450
451 /* start new worker and pass initial device */
452 worker_new(event);
453 }
454
455 static int event_queue_insert(struct udev_device *dev) {
456 struct event *event;
457
458 event = new0(struct event, 1);
459 if (event == NULL)
460 return -1;
461
462 event->udev = udev_device_get_udev(dev);
463 event->dev = dev;
464 event->seqnum = udev_device_get_seqnum(dev);
465 event->devpath = udev_device_get_devpath(dev);
466 event->devpath_len = strlen(event->devpath);
467 event->devpath_old = udev_device_get_devpath_old(dev);
468 event->devnum = udev_device_get_devnum(dev);
469 event->is_block = streq("block", udev_device_get_subsystem(dev));
470 event->ifindex = udev_device_get_ifindex(dev);
471
472 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
473 udev_device_get_action(dev), udev_device_get_subsystem(dev));
474
475 event->state = EVENT_QUEUED;
476 udev_list_node_append(&event->node, &event_list);
477 return 0;
478 }
479
480 static void worker_kill(struct udev *udev) {
481 struct udev_list_node *loop;
482
483 udev_list_node_foreach(loop, &worker_list) {
484 struct worker *worker = node_to_worker(loop);
485
486 if (worker->state == WORKER_KILLED)
487 continue;
488
489 worker->state = WORKER_KILLED;
490 kill(worker->pid, SIGTERM);
491 }
492 }
493
494 /* lookup event for identical, parent, child device */
495 static bool is_devpath_busy(struct event *event) {
496 struct udev_list_node *loop;
497 size_t common;
498
499 /* check if queue contains events we depend on */
500 udev_list_node_foreach(loop, &event_list) {
501 struct event *loop_event = node_to_event(loop);
502
503 /* we already found a later event, earlier can not block us, no need to check again */
504 if (loop_event->seqnum < event->delaying_seqnum)
505 continue;
506
507 /* event we checked earlier still exists, no need to check again */
508 if (loop_event->seqnum == event->delaying_seqnum)
509 return true;
510
511 /* found ourself, no later event can block us */
512 if (loop_event->seqnum >= event->seqnum)
513 break;
514
515 /* check major/minor */
516 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
517 return true;
518
519 /* check network device ifindex */
520 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
521 return true;
522
523 /* check our old name */
524 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
525 event->delaying_seqnum = loop_event->seqnum;
526 return true;
527 }
528
529 /* compare devpath */
530 common = MIN(loop_event->devpath_len, event->devpath_len);
531
532 /* one devpath is contained in the other? */
533 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
534 continue;
535
536 /* identical device event found */
537 if (loop_event->devpath_len == event->devpath_len) {
538 /* devices names might have changed/swapped in the meantime */
539 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
540 continue;
541 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
542 continue;
543 event->delaying_seqnum = loop_event->seqnum;
544 return true;
545 }
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 worker_kill(udev);
648 }
649
650 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
651 log_debug("udevd message (STOP_EXEC_QUEUE) received");
652 stop_exec_queue = true;
653 }
654
655 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
656 log_debug("udevd message (START_EXEC_QUEUE) received");
657 stop_exec_queue = false;
658 }
659
660 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
661 log_debug("udevd message (RELOAD) received");
662 reload = true;
663 }
664
665 str = udev_ctrl_get_set_env(ctrl_msg);
666 if (str != NULL) {
667 char *key;
668
669 key = strdup(str);
670 if (key != NULL) {
671 char *val;
672
673 val = strchr(key, '=');
674 if (val != NULL) {
675 val[0] = '\0';
676 val = &val[1];
677 if (val[0] == '\0') {
678 log_debug("udevd message (ENV) received, unset '%s'", key);
679 udev_add_property(udev, key, NULL);
680 } else {
681 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
682 udev_add_property(udev, key, val);
683 }
684 } else {
685 log_error("wrong key format '%s'", key);
686 }
687 free(key);
688 }
689 worker_kill(udev);
690 }
691
692 i = udev_ctrl_get_set_children_max(ctrl_msg);
693 if (i >= 0) {
694 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
695 arg_children_max = i;
696 }
697
698 if (udev_ctrl_get_ping(ctrl_msg) > 0)
699 log_debug("udevd message (SYNC) received");
700
701 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
702 log_debug("udevd message (EXIT) received");
703 udev_exit = true;
704 /* keep reference to block the client until we exit */
705 udev_ctrl_connection_ref(ctrl_conn);
706 }
707 out:
708 udev_ctrl_msg_unref(ctrl_msg);
709 return udev_ctrl_connection_unref(ctrl_conn);
710 }
711
712 static int synthesize_change(struct udev_device *dev) {
713 char filename[UTIL_PATH_SIZE];
714 int r;
715
716 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
717 streq_ptr("disk", udev_device_get_devtype(dev)) &&
718 !startswith(udev_device_get_sysname(dev), "dm-")) {
719 bool part_table_read = false;
720 bool has_partitions = false;
721 int fd;
722 struct udev *udev = udev_device_get_udev(dev);
723 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
724 struct udev_list_entry *item;
725
726 /*
727 * Try to re-read the partition table. This only succeeds if
728 * none of the devices is busy. The kernel returns 0 if no
729 * partition table is found, and we will not get an event for
730 * the disk.
731 */
732 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
733 if (fd >= 0) {
734 r = flock(fd, LOCK_EX|LOCK_NB);
735 if (r >= 0)
736 r = ioctl(fd, BLKRRPART, 0);
737
738 close(fd);
739 if (r >= 0)
740 part_table_read = true;
741 }
742
743 /* search for partitions */
744 e = udev_enumerate_new(udev);
745 if (!e)
746 return -ENOMEM;
747
748 r = udev_enumerate_add_match_parent(e, dev);
749 if (r < 0)
750 return r;
751
752 r = udev_enumerate_add_match_subsystem(e, "block");
753 if (r < 0)
754 return r;
755
756 r = udev_enumerate_scan_devices(e);
757 if (r < 0)
758 return r;
759
760 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
761 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
762
763 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
764 if (!d)
765 continue;
766
767 if (!streq_ptr("partition", udev_device_get_devtype(d)))
768 continue;
769
770 has_partitions = true;
771 break;
772 }
773
774 /*
775 * We have partitions and re-read the table, the kernel already sent
776 * out a "change" event for the disk, and "remove/add" for all
777 * partitions.
778 */
779 if (part_table_read && has_partitions)
780 return 0;
781
782 /*
783 * We have partitions but re-reading the partition table did not
784 * work, synthesize "change" for the disk and all partitions.
785 */
786 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
787 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
788 write_string_file(filename, "change");
789
790 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
791 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
792
793 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
794 if (!d)
795 continue;
796
797 if (!streq_ptr("partition", udev_device_get_devtype(d)))
798 continue;
799
800 log_debug("device %s closed, synthesising partition '%s' 'change'",
801 udev_device_get_devnode(dev), udev_device_get_devnode(d));
802 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
803 write_string_file(filename, "change");
804 }
805
806 return 0;
807 }
808
809 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
810 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
811 write_string_file(filename, "change");
812
813 return 0;
814 }
815
816 static int handle_inotify(struct udev *udev) {
817 int nbytes, pos;
818 char *buf;
819 struct inotify_event *ev;
820 int r;
821
822 r = ioctl(fd_inotify, FIONREAD, &nbytes);
823 if (r < 0 || nbytes <= 0)
824 return -errno;
825
826 buf = malloc(nbytes);
827 if (!buf) {
828 log_error("error getting buffer for inotify");
829 return -ENOMEM;
830 }
831
832 nbytes = read(fd_inotify, buf, nbytes);
833
834 for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) {
835 struct udev_device *dev;
836
837 ev = (struct inotify_event *)(buf + pos);
838 dev = udev_watch_lookup(udev, ev->wd);
839 if (!dev)
840 continue;
841
842 log_debug("inotify event: %x for %s", ev->mask, udev_device_get_devnode(dev));
843 if (ev->mask & IN_CLOSE_WRITE)
844 synthesize_change(dev);
845 else if (ev->mask & IN_IGNORED)
846 udev_watch_end(udev, dev);
847
848 udev_device_unref(dev);
849 }
850
851 free(buf);
852 return 0;
853 }
854
855 static void handle_signal(struct udev *udev, int signo) {
856 switch (signo) {
857 case SIGINT:
858 case SIGTERM:
859 udev_exit = true;
860 break;
861 case SIGCHLD:
862 for (;;) {
863 pid_t pid;
864 int status;
865 struct udev_list_node *loop, *tmp;
866
867 pid = waitpid(-1, &status, WNOHANG);
868 if (pid <= 0)
869 break;
870
871 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
872 struct worker *worker = node_to_worker(loop);
873
874 if (worker->pid != pid)
875 continue;
876 log_debug("worker [%u] exit", pid);
877
878 if (WIFEXITED(status)) {
879 if (WEXITSTATUS(status) != 0)
880 log_error("worker [%u] exit with return code %i",
881 pid, WEXITSTATUS(status));
882 } else if (WIFSIGNALED(status)) {
883 log_error("worker [%u] terminated by signal %i (%s)",
884 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
885 } else if (WIFSTOPPED(status)) {
886 log_error("worker [%u] stopped", pid);
887 } else if (WIFCONTINUED(status)) {
888 log_error("worker [%u] continued", pid);
889 } else {
890 log_error("worker [%u] exit with status 0x%04x", pid, status);
891 }
892
893 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
894 if (worker->event) {
895 log_error("worker [%u] failed while handling '%s'",
896 pid, worker->event->devpath);
897 worker->event->exitcode = -32;
898 event_queue_delete(worker->event);
899
900 /* drop reference taken for state 'running' */
901 worker_unref(worker);
902 }
903 }
904 worker_unref(worker);
905 break;
906 }
907 }
908 break;
909 case SIGHUP:
910 reload = true;
911 break;
912 }
913 }
914
915 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) {
916 int ctrl = -1, netlink = -1;
917 int fd, n;
918
919 n = sd_listen_fds(true);
920 if (n <= 0)
921 return -1;
922
923 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
924 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
925 if (ctrl >= 0)
926 return -1;
927 ctrl = fd;
928 continue;
929 }
930
931 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
932 if (netlink >= 0)
933 return -1;
934 netlink = fd;
935 continue;
936 }
937
938 return -1;
939 }
940
941 if (ctrl < 0 || netlink < 0)
942 return -1;
943
944 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
945 *rctrl = ctrl;
946 *rnetlink = netlink;
947 return 0;
948 }
949
950 /*
951 * read the kernel command line, in case we need to get into debug mode
952 * udev.log-priority=<level> syslog priority
953 * udev.children-max=<number of workers> events are fully serialized if set to 1
954 * udev.exec-delay=<number of seconds> delay execution of every executed program
955 */
956 static void kernel_cmdline_options(struct udev *udev) {
957 _cleanup_free_ char *line = NULL;
958 const char *word, *state;
959 size_t l;
960 int r;
961
962 r = proc_cmdline(&line);
963 if (r < 0) {
964 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
965 return;
966 }
967
968 FOREACH_WORD_QUOTED(word, l, line, state) {
969 char *s, *opt, *value;
970
971 s = strndup(word, l);
972 if (!s)
973 break;
974
975 /* accept the same options for the initrd, prefixed with "rd." */
976 if (in_initrd() && startswith(s, "rd."))
977 opt = s + 3;
978 else
979 opt = s;
980
981 if ((value = startswith(opt, "udev.log-priority="))) {
982 int prio;
983
984 prio = util_log_priority(value);
985 log_set_max_level(prio);
986 } else if ((value = startswith(opt, "udev.children-max="))) {
987 r = safe_atoi(value, &arg_children_max);
988 if (r < 0)
989 log_warning("Invalid udev.children-max ignored: %s", value);
990 } else if ((value = startswith(opt, "udev.exec-delay="))) {
991 r = safe_atoi(value, &arg_exec_delay);
992 if (r < 0)
993 log_warning("Invalid udev.exec-delay ignored: %s", value);
994 } else if ((value = startswith(opt, "udev.event-timeout="))) {
995 r = safe_atou64(value, &arg_event_timeout_usec);
996 if (r < 0) {
997 log_warning("Invalid udev.event-timeout ignored: %s", value);
998 break;
999 }
1000 arg_event_timeout_usec *= USEC_PER_SEC;
1001 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1002 }
1003
1004 free(s);
1005 }
1006 }
1007
1008 static void help(void) {
1009 printf("%s [OPTIONS...]\n\n"
1010 "Manages devices.\n\n"
1011 " --daemon\n"
1012 " --debug\n"
1013 " --children-max=<maximum number of workers>\n"
1014 " --exec-delay=<seconds to wait before executing RUN=>\n"
1015 " --event-timeout=<seconds to wait before terminating an event>\n"
1016 " --resolve-names=early|late|never\n"
1017 " --version\n"
1018 " --help\n"
1019 , program_invocation_short_name);
1020 }
1021
1022 static int parse_argv(int argc, char *argv[]) {
1023 static const struct option options[] = {
1024 { "daemon", no_argument, NULL, 'd' },
1025 { "debug", no_argument, NULL, 'D' },
1026 { "children-max", required_argument, NULL, 'c' },
1027 { "exec-delay", required_argument, NULL, 'e' },
1028 { "event-timeout", required_argument, NULL, 't' },
1029 { "resolve-names", required_argument, NULL, 'N' },
1030 { "help", no_argument, NULL, 'h' },
1031 { "version", no_argument, NULL, 'V' },
1032 {}
1033 };
1034
1035 int c;
1036
1037 assert(argc >= 0);
1038 assert(argv);
1039
1040 while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) {
1041 int r;
1042
1043 switch (c) {
1044
1045 case 'd':
1046 arg_daemonize = true;
1047 break;
1048 case 'c':
1049 r = safe_atoi(optarg, &arg_children_max);
1050 if (r < 0)
1051 log_warning("Invalid --children-max ignored: %s", optarg);
1052 break;
1053 case 'e':
1054 r = safe_atoi(optarg, &arg_exec_delay);
1055 if (r < 0)
1056 log_warning("Invalid --exec-delay ignored: %s", optarg);
1057 break;
1058 case 't':
1059 r = safe_atou64(optarg, &arg_event_timeout_usec);
1060 if (r < 0)
1061 log_warning("Invalid --event-timeout ignored: %s", optarg);
1062 else {
1063 arg_event_timeout_usec *= USEC_PER_SEC;
1064 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1065 }
1066 break;
1067 case 'D':
1068 arg_debug = true;
1069 break;
1070 case 'N':
1071 if (streq(optarg, "early")) {
1072 arg_resolve_names = 1;
1073 } else if (streq(optarg, "late")) {
1074 arg_resolve_names = 0;
1075 } else if (streq(optarg, "never")) {
1076 arg_resolve_names = -1;
1077 } else {
1078 log_error("resolve-names must be early, late or never");
1079 return 0;
1080 }
1081 break;
1082 case 'h':
1083 help();
1084 return 0;
1085 case 'V':
1086 printf("%s\n", VERSION);
1087 return 0;
1088 case '?':
1089 return -EINVAL;
1090 default:
1091 assert_not_reached("Unhandled option");
1092
1093 }
1094 }
1095
1096 return 1;
1097 }
1098
1099 int main(int argc, char *argv[]) {
1100 struct udev *udev;
1101 sigset_t mask;
1102 int fd_ctrl = -1;
1103 int fd_netlink = -1;
1104 int fd_worker = -1;
1105 struct epoll_event ep_ctrl = { .events = EPOLLIN };
1106 struct epoll_event ep_inotify = { .events = EPOLLIN };
1107 struct epoll_event ep_signal = { .events = EPOLLIN };
1108 struct epoll_event ep_netlink = { .events = EPOLLIN };
1109 struct epoll_event ep_worker = { .events = EPOLLIN };
1110 struct udev_ctrl_connection *ctrl_conn = NULL;
1111 int rc = 1, r;
1112
1113 udev = udev_new();
1114 if (udev == NULL)
1115 goto exit;
1116
1117 log_set_target(LOG_TARGET_AUTO);
1118 log_parse_environment();
1119 log_open();
1120
1121 r = parse_argv(argc, argv);
1122 if (r <= 0)
1123 goto exit;
1124
1125 kernel_cmdline_options(udev);
1126
1127 if (arg_debug)
1128 log_set_max_level(LOG_DEBUG);
1129
1130 if (getuid() != 0) {
1131 log_error("root privileges required");
1132 goto exit;
1133 }
1134
1135 r = mac_selinux_init("/dev");
1136 if (r < 0) {
1137 log_error("could not initialize labelling: %s", strerror(-r));
1138 goto exit;
1139 }
1140
1141 /* set umask before creating any file/directory */
1142 r = chdir("/");
1143 if (r < 0) {
1144 log_error("could not change dir to /: %m");
1145 goto exit;
1146 }
1147
1148 umask(022);
1149
1150 r = mkdir("/run/udev", 0755);
1151 if (r < 0 && errno != EEXIST) {
1152 log_error("could not create /run/udev: %m");
1153 goto exit;
1154 }
1155
1156 dev_setup(NULL);
1157
1158 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1159 if (arg_daemonize) {
1160 int fd;
1161
1162 fd = open("/dev/null", O_RDWR);
1163 if (fd >= 0) {
1164 if (write(STDOUT_FILENO, 0, 0) < 0)
1165 dup2(fd, STDOUT_FILENO);
1166 if (write(STDERR_FILENO, 0, 0) < 0)
1167 dup2(fd, STDERR_FILENO);
1168 if (fd > STDERR_FILENO)
1169 close(fd);
1170 } else {
1171 log_error("cannot open /dev/null");
1172 }
1173 }
1174
1175 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1176 /* get control and netlink socket from systemd */
1177 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1178 if (udev_ctrl == NULL) {
1179 log_error("error taking over udev control socket");
1180 rc = 1;
1181 goto exit;
1182 }
1183
1184 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1185 if (monitor == NULL) {
1186 log_error("error taking over netlink socket");
1187 rc = 3;
1188 goto exit;
1189 }
1190
1191 /* get our own cgroup, we regularly kill everything udev has left behind */
1192 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1193 udev_cgroup = NULL;
1194 } else {
1195 /* open control and netlink socket */
1196 udev_ctrl = udev_ctrl_new(udev);
1197 if (udev_ctrl == NULL) {
1198 log_error("error initializing udev control socket");
1199 rc = 1;
1200 goto exit;
1201 }
1202 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1203
1204 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1205 if (monitor == NULL) {
1206 log_error("error initializing netlink socket");
1207 rc = 3;
1208 goto exit;
1209 }
1210 fd_netlink = udev_monitor_get_fd(monitor);
1211 }
1212
1213 if (udev_monitor_enable_receiving(monitor) < 0) {
1214 log_error("error binding netlink socket");
1215 rc = 3;
1216 goto exit;
1217 }
1218
1219 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1220 log_error("error binding udev control socket");
1221 rc = 1;
1222 goto exit;
1223 }
1224
1225 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1226
1227 log_info("starting version " VERSION "\n");
1228
1229 udev_builtin_init(udev);
1230
1231 rules = udev_rules_new(udev, arg_resolve_names);
1232 if (rules == NULL) {
1233 log_error("error reading rules");
1234 goto exit;
1235 }
1236
1237 rc = udev_rules_apply_static_dev_perms(rules);
1238 if (rc < 0)
1239 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1240
1241 if (arg_daemonize) {
1242 pid_t pid;
1243
1244 pid = fork();
1245 switch (pid) {
1246 case 0:
1247 break;
1248 case -1:
1249 log_error("fork of daemon failed: %m");
1250 rc = 4;
1251 goto exit;
1252 default:
1253 rc = EXIT_SUCCESS;
1254 goto exit_daemonize;
1255 }
1256
1257 setsid();
1258
1259 write_string_file("/proc/self/oom_score_adj", "-1000");
1260 } else {
1261 sd_notify(1, "READY=1");
1262 }
1263
1264 if (arg_children_max <= 0) {
1265 cpu_set_t cpu_set;
1266
1267 arg_children_max = 8;
1268
1269 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1270 arg_children_max += CPU_COUNT(&cpu_set) * 2;
1271 }
1272 }
1273 log_debug("set children_max to %u", arg_children_max);
1274
1275 udev_list_node_init(&event_list);
1276 udev_list_node_init(&worker_list);
1277
1278 fd_inotify = udev_watch_init(udev);
1279 if (fd_inotify < 0) {
1280 log_error("error initializing inotify");
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 log_error("error creating signalfd");
1292 rc = 5;
1293 goto exit;
1294 }
1295
1296 /* unnamed socket from workers to the main daemon */
1297 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1298 log_error("error creating socketpair");
1299 rc = 6;
1300 goto exit;
1301 }
1302 fd_worker = worker_watch[READ_END];
1303
1304 ep_ctrl.data.fd = fd_ctrl;
1305 ep_inotify.data.fd = fd_inotify;
1306 ep_signal.data.fd = fd_signal;
1307 ep_netlink.data.fd = fd_netlink;
1308 ep_worker.data.fd = fd_worker;
1309
1310 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1311 if (fd_ep < 0) {
1312 log_error("error creating epoll fd: %m");
1313 goto exit;
1314 }
1315 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1316 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1317 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1318 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1319 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1320 log_error("fail to add fds to epoll: %m");
1321 goto exit;
1322 }
1323
1324 for (;;) {
1325 static usec_t last_usec;
1326 struct epoll_event ev[8];
1327 int fdcount;
1328 int timeout;
1329 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1330 int i;
1331
1332 if (udev_exit) {
1333 /* close sources of new events and discard buffered events */
1334 if (fd_ctrl >= 0) {
1335 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1336 fd_ctrl = -1;
1337 }
1338 if (monitor != NULL) {
1339 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1340 udev_monitor_unref(monitor);
1341 monitor = NULL;
1342 }
1343 if (fd_inotify >= 0) {
1344 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1345 close(fd_inotify);
1346 fd_inotify = -1;
1347 }
1348
1349 /* discard queued events and kill workers */
1350 event_queue_cleanup(udev, EVENT_QUEUED);
1351 worker_kill(udev);
1352
1353 /* exit after all has cleaned up */
1354 if (udev_list_node_is_empty(&event_list) && children == 0)
1355 break;
1356
1357 /* timeout at exit for workers to finish */
1358 timeout = 30 * MSEC_PER_SEC;
1359 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1360 /* we are idle */
1361 timeout = -1;
1362
1363 /* cleanup possible left-over processes in our cgroup */
1364 if (udev_cgroup)
1365 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1366 } else {
1367 /* kill idle or hanging workers */
1368 timeout = 3 * MSEC_PER_SEC;
1369 }
1370
1371 /* tell settle that we are busy or idle */
1372 if (!udev_list_node_is_empty(&event_list)) {
1373 int fd;
1374
1375 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1376 if (fd >= 0)
1377 close(fd);
1378 } else {
1379 unlink("/run/udev/queue");
1380 }
1381
1382 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1383 if (fdcount < 0)
1384 continue;
1385
1386 if (fdcount == 0) {
1387 struct udev_list_node *loop;
1388
1389 /* timeout */
1390 if (udev_exit) {
1391 log_error("timeout, giving up waiting for workers to finish");
1392 break;
1393 }
1394
1395 /* kill idle workers */
1396 if (udev_list_node_is_empty(&event_list)) {
1397 log_debug("cleanup idle workers");
1398 worker_kill(udev);
1399 }
1400
1401 /* check for hanging events */
1402 udev_list_node_foreach(loop, &worker_list) {
1403 struct worker *worker = node_to_worker(loop);
1404 usec_t ts;
1405
1406 if (worker->state != WORKER_RUNNING)
1407 continue;
1408
1409 ts = now(CLOCK_MONOTONIC);
1410
1411 if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) {
1412 if ((ts - worker->event_start_usec) > arg_event_timeout_usec) {
1413 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1414 kill(worker->pid, SIGKILL);
1415 worker->state = WORKER_KILLED;
1416
1417 /* drop reference taken for state 'running' */
1418 worker_unref(worker);
1419 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1420 worker->event->exitcode = -64;
1421 event_queue_delete(worker->event);
1422 worker->event = NULL;
1423 } else if (!worker->event_warned) {
1424 log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
1425 worker->event_warned = true;
1426 }
1427 }
1428 }
1429
1430 }
1431
1432 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1433 for (i = 0; i < fdcount; i++) {
1434 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1435 is_worker = true;
1436 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1437 is_netlink = true;
1438 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1439 is_signal = true;
1440 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1441 is_inotify = true;
1442 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1443 is_ctrl = true;
1444 }
1445
1446 /* check for changed config, every 3 seconds at most */
1447 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1448 if (udev_rules_check_timestamp(rules))
1449 reload = true;
1450 if (udev_builtin_validate(udev))
1451 reload = true;
1452
1453 last_usec = now(CLOCK_MONOTONIC);
1454 }
1455
1456 /* reload requested, HUP signal received, rules changed, builtin changed */
1457 if (reload) {
1458 worker_kill(udev);
1459 rules = udev_rules_unref(rules);
1460 udev_builtin_exit(udev);
1461 reload = false;
1462 }
1463
1464 /* event has finished */
1465 if (is_worker)
1466 worker_returned(fd_worker);
1467
1468 if (is_netlink) {
1469 struct udev_device *dev;
1470
1471 dev = udev_monitor_receive_device(monitor);
1472 if (dev != NULL) {
1473 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1474 if (event_queue_insert(dev) < 0)
1475 udev_device_unref(dev);
1476 }
1477 }
1478
1479 /* start new events */
1480 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1481 udev_builtin_init(udev);
1482 if (rules == NULL)
1483 rules = udev_rules_new(udev, arg_resolve_names);
1484 if (rules != NULL)
1485 event_queue_start(udev);
1486 }
1487
1488 if (is_signal) {
1489 struct signalfd_siginfo fdsi;
1490 ssize_t size;
1491
1492 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1493 if (size == sizeof(struct signalfd_siginfo))
1494 handle_signal(udev, fdsi.ssi_signo);
1495 }
1496
1497 /* we are shutting down, the events below are not handled anymore */
1498 if (udev_exit)
1499 continue;
1500
1501 /* device node watch */
1502 if (is_inotify)
1503 handle_inotify(udev);
1504
1505 /*
1506 * This needs to be after the inotify handling, to make sure,
1507 * that the ping is send back after the possibly generated
1508 * "change" events by the inotify device node watch.
1509 *
1510 * A single time we may receive a client connection which we need to
1511 * keep open to block the client. It will be closed right before we
1512 * exit.
1513 */
1514 if (is_ctrl)
1515 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1516 }
1517
1518 rc = EXIT_SUCCESS;
1519 exit:
1520 udev_ctrl_cleanup(udev_ctrl);
1521 unlink("/run/udev/queue");
1522 exit_daemonize:
1523 if (fd_ep >= 0)
1524 close(fd_ep);
1525 worker_list_cleanup(udev);
1526 event_queue_cleanup(udev, EVENT_UNDEF);
1527 udev_rules_unref(rules);
1528 udev_builtin_exit(udev);
1529 if (fd_signal >= 0)
1530 close(fd_signal);
1531 if (worker_watch[READ_END] >= 0)
1532 close(worker_watch[READ_END]);
1533 if (worker_watch[WRITE_END] >= 0)
1534 close(worker_watch[WRITE_END]);
1535 udev_monitor_unref(monitor);
1536 udev_ctrl_connection_unref(ctrl_conn);
1537 udev_ctrl_unref(udev_ctrl);
1538 mac_selinux_finish();
1539 udev_unref(udev);
1540 log_close();
1541 return rc;
1542 }
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