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systemd-hwdb: introduce new tool
[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 if (udev_event->rtnl)
319 /* in case rtnl was initialized */
320 rtnl = sd_rtnl_ref(udev_event->rtnl);
321
322 /* apply/restore inotify watch */
323 if (udev_event->inotify_watch) {
324 udev_watch_begin(udev, dev);
325 udev_device_update_db(dev);
326 }
327
328 safe_close(fd_lock);
329
330 /* send processed event back to libudev listeners */
331 udev_monitor_send_device(worker_monitor, NULL, dev);
332
333 skip:
334 /* send udevd the result of the event execution */
335 memzero(&msg, sizeof(struct worker_message));
336 msg.exitcode = err;
337 msg.pid = getpid();
338 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
339
340 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
341
342 udev_device_unref(dev);
343 dev = NULL;
344
345 if (udev_event->sigterm) {
346 udev_event_unref(udev_event);
347 goto out;
348 }
349
350 udev_event_unref(udev_event);
351
352 /* wait for more device messages from main udevd, or term signal */
353 while (dev == NULL) {
354 struct epoll_event ev[4];
355 int fdcount;
356 int i;
357
358 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
359 if (fdcount < 0) {
360 if (errno == EINTR)
361 continue;
362 log_error_errno(errno, "failed to poll: %m");
363 goto out;
364 }
365
366 for (i = 0; i < fdcount; i++) {
367 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
368 dev = udev_monitor_receive_device(worker_monitor);
369 break;
370 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
371 struct signalfd_siginfo fdsi;
372 ssize_t size;
373
374 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
375 if (size != sizeof(struct signalfd_siginfo))
376 continue;
377 switch (fdsi.ssi_signo) {
378 case SIGTERM:
379 goto out;
380 }
381 }
382 }
383 }
384 }
385 out:
386 udev_device_unref(dev);
387 safe_close(fd_signal);
388 safe_close(fd_ep);
389 close(fd_inotify);
390 close(worker_watch[WRITE_END]);
391 udev_rules_unref(rules);
392 udev_builtin_exit(udev);
393 udev_monitor_unref(worker_monitor);
394 udev_unref(udev);
395 log_close();
396 exit(rc);
397 }
398 case -1:
399 udev_monitor_unref(worker_monitor);
400 event->state = EVENT_QUEUED;
401 free(worker);
402 log_error_errno(errno, "fork of child failed: %m");
403 break;
404 default:
405 /* close monitor, but keep address around */
406 udev_monitor_disconnect(worker_monitor);
407 worker->monitor = worker_monitor;
408 worker->pid = pid;
409 worker->state = WORKER_RUNNING;
410 worker->event_start_usec = now(CLOCK_MONOTONIC);
411 worker->event_warned = false;
412 worker->event = event;
413 event->state = EVENT_RUNNING;
414 udev_list_node_append(&worker->node, &worker_list);
415 children++;
416 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
417 break;
418 }
419 }
420
421 static void event_run(struct event *event) {
422 struct udev_list_node *loop;
423
424 udev_list_node_foreach(loop, &worker_list) {
425 struct worker *worker = node_to_worker(loop);
426 ssize_t count;
427
428 if (worker->state != WORKER_IDLE)
429 continue;
430
431 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
432 if (count < 0) {
433 log_error_errno(errno, "worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
434 kill(worker->pid, SIGKILL);
435 worker->state = WORKER_KILLED;
436 continue;
437 }
438 worker_ref(worker);
439 worker->event = event;
440 worker->state = WORKER_RUNNING;
441 worker->event_start_usec = now(CLOCK_MONOTONIC);
442 worker->event_warned = false;
443 event->state = EVENT_RUNNING;
444 return;
445 }
446
447 if (children >= arg_children_max) {
448 if (arg_children_max > 1)
449 log_debug("maximum number (%i) of children reached", children);
450 return;
451 }
452
453 /* start new worker and pass initial device */
454 worker_new(event);
455 }
456
457 static int event_queue_insert(struct udev_device *dev) {
458 struct event *event;
459
460 event = new0(struct event, 1);
461 if (event == NULL)
462 return -1;
463
464 event->udev = udev_device_get_udev(dev);
465 event->dev = dev;
466 event->seqnum = udev_device_get_seqnum(dev);
467 event->devpath = udev_device_get_devpath(dev);
468 event->devpath_len = strlen(event->devpath);
469 event->devpath_old = udev_device_get_devpath_old(dev);
470 event->devnum = udev_device_get_devnum(dev);
471 event->is_block = streq("block", udev_device_get_subsystem(dev));
472 event->ifindex = udev_device_get_ifindex(dev);
473
474 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
475 udev_device_get_action(dev), udev_device_get_subsystem(dev));
476
477 event->state = EVENT_QUEUED;
478 udev_list_node_append(&event->node, &event_list);
479 return 0;
480 }
481
482 static void worker_kill(struct udev *udev) {
483 struct udev_list_node *loop;
484
485 udev_list_node_foreach(loop, &worker_list) {
486 struct worker *worker = node_to_worker(loop);
487
488 if (worker->state == WORKER_KILLED)
489 continue;
490
491 worker->state = WORKER_KILLED;
492 kill(worker->pid, SIGTERM);
493 }
494 }
495
496 /* lookup event for identical, parent, child device */
497 static bool is_devpath_busy(struct event *event) {
498 struct udev_list_node *loop;
499 size_t common;
500
501 /* check if queue contains events we depend on */
502 udev_list_node_foreach(loop, &event_list) {
503 struct event *loop_event = node_to_event(loop);
504
505 /* we already found a later event, earlier can not block us, no need to check again */
506 if (loop_event->seqnum < event->delaying_seqnum)
507 continue;
508
509 /* event we checked earlier still exists, no need to check again */
510 if (loop_event->seqnum == event->delaying_seqnum)
511 return true;
512
513 /* found ourself, no later event can block us */
514 if (loop_event->seqnum >= event->seqnum)
515 break;
516
517 /* check major/minor */
518 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
519 return true;
520
521 /* check network device ifindex */
522 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
523 return true;
524
525 /* check our old name */
526 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
527 event->delaying_seqnum = loop_event->seqnum;
528 return true;
529 }
530
531 /* compare devpath */
532 common = MIN(loop_event->devpath_len, event->devpath_len);
533
534 /* one devpath is contained in the other? */
535 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
536 continue;
537
538 /* identical device event found */
539 if (loop_event->devpath_len == event->devpath_len) {
540 /* devices names might have changed/swapped in the meantime */
541 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
542 continue;
543 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
544 continue;
545 event->delaying_seqnum = loop_event->seqnum;
546 return true;
547 }
548
549 /* parent device event found */
550 if (event->devpath[common] == '/') {
551 event->delaying_seqnum = loop_event->seqnum;
552 return true;
553 }
554
555 /* child device event found */
556 if (loop_event->devpath[common] == '/') {
557 event->delaying_seqnum = loop_event->seqnum;
558 return true;
559 }
560
561 /* no matching device */
562 continue;
563 }
564
565 return false;
566 }
567
568 static void event_queue_start(struct udev *udev) {
569 struct udev_list_node *loop;
570
571 udev_list_node_foreach(loop, &event_list) {
572 struct event *event = node_to_event(loop);
573
574 if (event->state != EVENT_QUEUED)
575 continue;
576
577 /* do not start event if parent or child event is still running */
578 if (is_devpath_busy(event))
579 continue;
580
581 event_run(event);
582 }
583 }
584
585 static void event_queue_cleanup(struct udev *udev, enum event_state match_type) {
586 struct udev_list_node *loop, *tmp;
587
588 udev_list_node_foreach_safe(loop, tmp, &event_list) {
589 struct event *event = node_to_event(loop);
590
591 if (match_type != EVENT_UNDEF && match_type != event->state)
592 continue;
593
594 event_queue_delete(event);
595 }
596 }
597
598 static void worker_returned(int fd_worker) {
599 for (;;) {
600 struct worker_message msg;
601 ssize_t size;
602 struct udev_list_node *loop;
603
604 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
605 if (size != sizeof(struct worker_message))
606 break;
607
608 /* lookup worker who sent the signal */
609 udev_list_node_foreach(loop, &worker_list) {
610 struct worker *worker = node_to_worker(loop);
611
612 if (worker->pid != msg.pid)
613 continue;
614
615 /* worker returned */
616 if (worker->event) {
617 worker->event->exitcode = msg.exitcode;
618 event_queue_delete(worker->event);
619 worker->event = NULL;
620 }
621 if (worker->state != WORKER_KILLED)
622 worker->state = WORKER_IDLE;
623 worker_unref(worker);
624 break;
625 }
626 }
627 }
628
629 /* receive the udevd message from userspace */
630 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) {
631 struct udev *udev = udev_ctrl_get_udev(uctrl);
632 struct udev_ctrl_connection *ctrl_conn;
633 struct udev_ctrl_msg *ctrl_msg = NULL;
634 const char *str;
635 int i;
636
637 ctrl_conn = udev_ctrl_get_connection(uctrl);
638 if (ctrl_conn == NULL)
639 goto out;
640
641 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
642 if (ctrl_msg == NULL)
643 goto out;
644
645 i = udev_ctrl_get_set_log_level(ctrl_msg);
646 if (i >= 0) {
647 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
648 log_set_max_level(i);
649 worker_kill(udev);
650 }
651
652 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
653 log_debug("udevd message (STOP_EXEC_QUEUE) received");
654 stop_exec_queue = true;
655 }
656
657 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
658 log_debug("udevd message (START_EXEC_QUEUE) received");
659 stop_exec_queue = false;
660 }
661
662 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
663 log_debug("udevd message (RELOAD) received");
664 reload = true;
665 }
666
667 str = udev_ctrl_get_set_env(ctrl_msg);
668 if (str != NULL) {
669 char *key;
670
671 key = strdup(str);
672 if (key != NULL) {
673 char *val;
674
675 val = strchr(key, '=');
676 if (val != NULL) {
677 val[0] = '\0';
678 val = &val[1];
679 if (val[0] == '\0') {
680 log_debug("udevd message (ENV) received, unset '%s'", key);
681 udev_list_entry_add(&properties_list, key, NULL);
682 } else {
683 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
684 udev_list_entry_add(&properties_list, key, val);
685 }
686 } else {
687 log_error("wrong key format '%s'", key);
688 }
689 free(key);
690 }
691 worker_kill(udev);
692 }
693
694 i = udev_ctrl_get_set_children_max(ctrl_msg);
695 if (i >= 0) {
696 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
697 arg_children_max = i;
698 }
699
700 if (udev_ctrl_get_ping(ctrl_msg) > 0)
701 log_debug("udevd message (SYNC) received");
702
703 if (udev_ctrl_get_exit(ctrl_msg) > 0) {
704 log_debug("udevd message (EXIT) received");
705 udev_exit = true;
706 /* keep reference to block the client until we exit */
707 udev_ctrl_connection_ref(ctrl_conn);
708 }
709 out:
710 udev_ctrl_msg_unref(ctrl_msg);
711 return udev_ctrl_connection_unref(ctrl_conn);
712 }
713
714 static int synthesize_change(struct udev_device *dev) {
715 char filename[UTIL_PATH_SIZE];
716 int r;
717
718 if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
719 streq_ptr("disk", udev_device_get_devtype(dev)) &&
720 !startswith(udev_device_get_sysname(dev), "dm-")) {
721 bool part_table_read = false;
722 bool has_partitions = false;
723 int fd;
724 struct udev *udev = udev_device_get_udev(dev);
725 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
726 struct udev_list_entry *item;
727
728 /*
729 * Try to re-read the partition table. This only succeeds if
730 * none of the devices is busy. The kernel returns 0 if no
731 * partition table is found, and we will not get an event for
732 * the disk.
733 */
734 fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
735 if (fd >= 0) {
736 r = flock(fd, LOCK_EX|LOCK_NB);
737 if (r >= 0)
738 r = ioctl(fd, BLKRRPART, 0);
739
740 close(fd);
741 if (r >= 0)
742 part_table_read = true;
743 }
744
745 /* search for partitions */
746 e = udev_enumerate_new(udev);
747 if (!e)
748 return -ENOMEM;
749
750 r = udev_enumerate_add_match_parent(e, dev);
751 if (r < 0)
752 return r;
753
754 r = udev_enumerate_add_match_subsystem(e, "block");
755 if (r < 0)
756 return r;
757
758 r = udev_enumerate_scan_devices(e);
759 if (r < 0)
760 return r;
761
762 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
763 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
764
765 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
766 if (!d)
767 continue;
768
769 if (!streq_ptr("partition", udev_device_get_devtype(d)))
770 continue;
771
772 has_partitions = true;
773 break;
774 }
775
776 /*
777 * We have partitions and re-read the table, the kernel already sent
778 * out a "change" event for the disk, and "remove/add" for all
779 * partitions.
780 */
781 if (part_table_read && has_partitions)
782 return 0;
783
784 /*
785 * We have partitions but re-reading the partition table did not
786 * work, synthesize "change" for the disk and all partitions.
787 */
788 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
789 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
790 write_string_file(filename, "change");
791
792 udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
793 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
794
795 d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
796 if (!d)
797 continue;
798
799 if (!streq_ptr("partition", udev_device_get_devtype(d)))
800 continue;
801
802 log_debug("device %s closed, synthesising partition '%s' 'change'",
803 udev_device_get_devnode(dev), udev_device_get_devnode(d));
804 strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
805 write_string_file(filename, "change");
806 }
807
808 return 0;
809 }
810
811 log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
812 strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
813 write_string_file(filename, "change");
814
815 return 0;
816 }
817
818 static int handle_inotify(struct udev *udev) {
819 uint8_t buffer[INOTIFY_EVENT_MAX] _alignas_(struct inotify_event);
820 struct inotify_event *e;
821 ssize_t l;
822
823 l = read(fd_inotify, buffer, sizeof(buffer));
824 if (l < 0) {
825 if (errno == EAGAIN || errno == EINTR)
826 return 0;
827
828 return log_error_errno(errno, "Failed to read inotify fd: %m");
829 }
830
831 FOREACH_INOTIFY_EVENT(e, buffer, l) {
832 struct udev_device *dev;
833
834 dev = udev_watch_lookup(udev, e->wd);
835 if (!dev)
836 continue;
837
838 log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev));
839 if (e->mask & IN_CLOSE_WRITE)
840 synthesize_change(dev);
841 else if (e->mask & IN_IGNORED)
842 udev_watch_end(udev, dev);
843
844 udev_device_unref(dev);
845 }
846
847 return 0;
848 }
849
850 static void handle_signal(struct udev *udev, int signo) {
851 switch (signo) {
852 case SIGINT:
853 case SIGTERM:
854 udev_exit = true;
855 break;
856 case SIGCHLD:
857 for (;;) {
858 pid_t pid;
859 int status;
860 struct udev_list_node *loop, *tmp;
861
862 pid = waitpid(-1, &status, WNOHANG);
863 if (pid <= 0)
864 break;
865
866 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
867 struct worker *worker = node_to_worker(loop);
868
869 if (worker->pid != pid)
870 continue;
871 log_debug("worker [%u] exit", pid);
872
873 if (WIFEXITED(status)) {
874 if (WEXITSTATUS(status) != 0)
875 log_error("worker [%u] exit with return code %i",
876 pid, WEXITSTATUS(status));
877 } else if (WIFSIGNALED(status)) {
878 log_error("worker [%u] terminated by signal %i (%s)",
879 pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
880 } else if (WIFSTOPPED(status)) {
881 log_error("worker [%u] stopped", pid);
882 } else if (WIFCONTINUED(status)) {
883 log_error("worker [%u] continued", pid);
884 } else {
885 log_error("worker [%u] exit with status 0x%04x", pid, status);
886 }
887
888 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
889 if (worker->event) {
890 log_error("worker [%u] failed while handling '%s'",
891 pid, worker->event->devpath);
892 worker->event->exitcode = -32;
893 event_queue_delete(worker->event);
894
895 /* drop reference taken for state 'running' */
896 worker_unref(worker);
897 }
898 }
899 worker_unref(worker);
900 break;
901 }
902 }
903 break;
904 case SIGHUP:
905 reload = true;
906 break;
907 }
908 }
909
910 static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) {
911 int ctrl = -1, netlink = -1;
912 int fd, n;
913
914 n = sd_listen_fds(true);
915 if (n <= 0)
916 return -1;
917
918 for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) {
919 if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) {
920 if (ctrl >= 0)
921 return -1;
922 ctrl = fd;
923 continue;
924 }
925
926 if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
927 if (netlink >= 0)
928 return -1;
929 netlink = fd;
930 continue;
931 }
932
933 return -1;
934 }
935
936 if (ctrl < 0 || netlink < 0)
937 return -1;
938
939 log_debug("ctrl=%i netlink=%i", ctrl, netlink);
940 *rctrl = ctrl;
941 *rnetlink = netlink;
942 return 0;
943 }
944
945 /*
946 * read the kernel command line, in case we need to get into debug mode
947 * udev.log-priority=<level> syslog priority
948 * udev.children-max=<number of workers> events are fully serialized if set to 1
949 * udev.exec-delay=<number of seconds> delay execution of every executed program
950 */
951 static void kernel_cmdline_options(struct udev *udev) {
952 _cleanup_free_ char *line = NULL;
953 const char *word, *state;
954 size_t l;
955 int r;
956
957 r = proc_cmdline(&line);
958 if (r < 0) {
959 log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m");
960 return;
961 }
962
963 FOREACH_WORD_QUOTED(word, l, line, state) {
964 char *s, *opt, *value;
965
966 s = strndup(word, l);
967 if (!s)
968 break;
969
970 /* accept the same options for the initrd, prefixed with "rd." */
971 if (in_initrd() && startswith(s, "rd."))
972 opt = s + 3;
973 else
974 opt = s;
975
976 if ((value = startswith(opt, "udev.log-priority="))) {
977 int prio;
978
979 prio = util_log_priority(value);
980 log_set_max_level(prio);
981 } else if ((value = startswith(opt, "udev.children-max="))) {
982 r = safe_atoi(value, &arg_children_max);
983 if (r < 0)
984 log_warning("Invalid udev.children-max ignored: %s", value);
985 } else if ((value = startswith(opt, "udev.exec-delay="))) {
986 r = safe_atoi(value, &arg_exec_delay);
987 if (r < 0)
988 log_warning("Invalid udev.exec-delay ignored: %s", value);
989 } else if ((value = startswith(opt, "udev.event-timeout="))) {
990 r = safe_atou64(value, &arg_event_timeout_usec);
991 if (r < 0) {
992 log_warning("Invalid udev.event-timeout ignored: %s", value);
993 break;
994 }
995 arg_event_timeout_usec *= USEC_PER_SEC;
996 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
997 }
998
999 free(s);
1000 }
1001 }
1002
1003 static void help(void) {
1004 printf("%s [OPTIONS...]\n\n"
1005 "Manages devices.\n\n"
1006 " --daemon\n"
1007 " --debug\n"
1008 " --children-max=<maximum number of workers>\n"
1009 " --exec-delay=<seconds to wait before executing RUN=>\n"
1010 " --event-timeout=<seconds to wait before terminating an event>\n"
1011 " --resolve-names=early|late|never\n"
1012 " --version\n"
1013 " --help\n"
1014 , program_invocation_short_name);
1015 }
1016
1017 static int parse_argv(int argc, char *argv[]) {
1018 static const struct option options[] = {
1019 { "daemon", no_argument, NULL, 'd' },
1020 { "debug", no_argument, NULL, 'D' },
1021 { "children-max", required_argument, NULL, 'c' },
1022 { "exec-delay", required_argument, NULL, 'e' },
1023 { "event-timeout", required_argument, NULL, 't' },
1024 { "resolve-names", required_argument, NULL, 'N' },
1025 { "help", no_argument, NULL, 'h' },
1026 { "version", no_argument, NULL, 'V' },
1027 {}
1028 };
1029
1030 int c;
1031
1032 assert(argc >= 0);
1033 assert(argv);
1034
1035 while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) {
1036 int r;
1037
1038 switch (c) {
1039
1040 case 'd':
1041 arg_daemonize = true;
1042 break;
1043 case 'c':
1044 r = safe_atoi(optarg, &arg_children_max);
1045 if (r < 0)
1046 log_warning("Invalid --children-max ignored: %s", optarg);
1047 break;
1048 case 'e':
1049 r = safe_atoi(optarg, &arg_exec_delay);
1050 if (r < 0)
1051 log_warning("Invalid --exec-delay ignored: %s", optarg);
1052 break;
1053 case 't':
1054 r = safe_atou64(optarg, &arg_event_timeout_usec);
1055 if (r < 0)
1056 log_warning("Invalid --event-timeout ignored: %s", optarg);
1057 else {
1058 arg_event_timeout_usec *= USEC_PER_SEC;
1059 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1060 }
1061 break;
1062 case 'D':
1063 arg_debug = true;
1064 break;
1065 case 'N':
1066 if (streq(optarg, "early")) {
1067 arg_resolve_names = 1;
1068 } else if (streq(optarg, "late")) {
1069 arg_resolve_names = 0;
1070 } else if (streq(optarg, "never")) {
1071 arg_resolve_names = -1;
1072 } else {
1073 log_error("resolve-names must be early, late or never");
1074 return 0;
1075 }
1076 break;
1077 case 'h':
1078 help();
1079 return 0;
1080 case 'V':
1081 printf("%s\n", VERSION);
1082 return 0;
1083 case '?':
1084 return -EINVAL;
1085 default:
1086 assert_not_reached("Unhandled option");
1087
1088 }
1089 }
1090
1091 return 1;
1092 }
1093
1094 int main(int argc, char *argv[]) {
1095 struct udev *udev;
1096 sigset_t mask;
1097 int fd_ctrl = -1;
1098 int fd_netlink = -1;
1099 int fd_worker = -1;
1100 struct epoll_event ep_ctrl = { .events = EPOLLIN };
1101 struct epoll_event ep_inotify = { .events = EPOLLIN };
1102 struct epoll_event ep_signal = { .events = EPOLLIN };
1103 struct epoll_event ep_netlink = { .events = EPOLLIN };
1104 struct epoll_event ep_worker = { .events = EPOLLIN };
1105 struct udev_ctrl_connection *ctrl_conn = NULL;
1106 int rc = 1, r;
1107
1108 udev = udev_new();
1109 if (udev == NULL)
1110 goto exit;
1111
1112 log_set_target(LOG_TARGET_AUTO);
1113 log_parse_environment();
1114 log_open();
1115
1116 r = parse_argv(argc, argv);
1117 if (r <= 0)
1118 goto exit;
1119
1120 kernel_cmdline_options(udev);
1121
1122 if (arg_debug)
1123 log_set_max_level(LOG_DEBUG);
1124
1125 if (getuid() != 0) {
1126 log_error("root privileges required");
1127 goto exit;
1128 }
1129
1130 r = mac_selinux_init("/dev");
1131 if (r < 0) {
1132 log_error_errno(r, "could not initialize labelling: %m");
1133 goto exit;
1134 }
1135
1136 /* set umask before creating any file/directory */
1137 r = chdir("/");
1138 if (r < 0) {
1139 log_error_errno(errno, "could not change dir to /: %m");
1140 goto exit;
1141 }
1142
1143 umask(022);
1144
1145 udev_list_init(udev, &properties_list, true);
1146
1147 r = mkdir("/run/udev", 0755);
1148 if (r < 0 && errno != EEXIST) {
1149 log_error_errno(errno, "could not create /run/udev: %m");
1150 goto exit;
1151 }
1152
1153 dev_setup(NULL);
1154
1155 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1156 if (arg_daemonize) {
1157 int fd;
1158
1159 fd = open("/dev/null", O_RDWR);
1160 if (fd >= 0) {
1161 if (write(STDOUT_FILENO, 0, 0) < 0)
1162 dup2(fd, STDOUT_FILENO);
1163 if (write(STDERR_FILENO, 0, 0) < 0)
1164 dup2(fd, STDERR_FILENO);
1165 if (fd > STDERR_FILENO)
1166 close(fd);
1167 } else {
1168 log_error("cannot open /dev/null");
1169 }
1170 }
1171
1172 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1173 /* get control and netlink socket from systemd */
1174 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1175 if (udev_ctrl == NULL) {
1176 log_error("error taking over udev control socket");
1177 rc = 1;
1178 goto exit;
1179 }
1180
1181 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1182 if (monitor == NULL) {
1183 log_error("error taking over netlink socket");
1184 rc = 3;
1185 goto exit;
1186 }
1187
1188 /* get our own cgroup, we regularly kill everything udev has left behind */
1189 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1190 udev_cgroup = NULL;
1191 } else {
1192 /* open control and netlink socket */
1193 udev_ctrl = udev_ctrl_new(udev);
1194 if (udev_ctrl == NULL) {
1195 log_error("error initializing udev control socket");
1196 rc = 1;
1197 goto exit;
1198 }
1199 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1200
1201 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1202 if (monitor == NULL) {
1203 log_error("error initializing netlink socket");
1204 rc = 3;
1205 goto exit;
1206 }
1207 fd_netlink = udev_monitor_get_fd(monitor);
1208
1209 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1210 }
1211
1212 if (udev_monitor_enable_receiving(monitor) < 0) {
1213 log_error("error binding netlink socket");
1214 rc = 3;
1215 goto exit;
1216 }
1217
1218 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1219 log_error("error binding udev control socket");
1220 rc = 1;
1221 goto exit;
1222 }
1223
1224 log_info("starting version " VERSION);
1225
1226 udev_builtin_init(udev);
1227
1228 rules = udev_rules_new(udev, arg_resolve_names);
1229 if (rules == NULL) {
1230 log_error("error reading rules");
1231 goto exit;
1232 }
1233
1234 rc = udev_rules_apply_static_dev_perms(rules);
1235 if (rc < 0)
1236 log_error_errno(rc, "failed to apply permissions on static device nodes - %m");
1237
1238 if (arg_daemonize) {
1239 pid_t pid;
1240
1241 pid = fork();
1242 switch (pid) {
1243 case 0:
1244 break;
1245 case -1:
1246 log_error_errno(errno, "fork of daemon failed: %m");
1247 rc = 4;
1248 goto exit;
1249 default:
1250 rc = EXIT_SUCCESS;
1251 goto exit_daemonize;
1252 }
1253
1254 setsid();
1255
1256 write_string_file("/proc/self/oom_score_adj", "-1000");
1257 } else {
1258 sd_notify(1, "READY=1");
1259 }
1260
1261 if (arg_children_max <= 0) {
1262 cpu_set_t cpu_set;
1263
1264 arg_children_max = 8;
1265
1266 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1267 arg_children_max += CPU_COUNT(&cpu_set) * 2;
1268 }
1269 }
1270 log_debug("set children_max to %u", arg_children_max);
1271
1272 udev_list_node_init(&event_list);
1273 udev_list_node_init(&worker_list);
1274
1275 fd_inotify = udev_watch_init(udev);
1276 if (fd_inotify < 0) {
1277 log_error("error initializing inotify");
1278 rc = 4;
1279 goto exit;
1280 }
1281 udev_watch_restore(udev);
1282
1283 /* block and listen to all signals on signalfd */
1284 sigfillset(&mask);
1285 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1286 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1287 if (fd_signal < 0) {
1288 log_error("error creating signalfd");
1289 rc = 5;
1290 goto exit;
1291 }
1292
1293 /* unnamed socket from workers to the main daemon */
1294 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1295 log_error("error creating socketpair");
1296 rc = 6;
1297 goto exit;
1298 }
1299 fd_worker = worker_watch[READ_END];
1300
1301 ep_ctrl.data.fd = fd_ctrl;
1302 ep_inotify.data.fd = fd_inotify;
1303 ep_signal.data.fd = fd_signal;
1304 ep_netlink.data.fd = fd_netlink;
1305 ep_worker.data.fd = fd_worker;
1306
1307 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1308 if (fd_ep < 0) {
1309 log_error_errno(errno, "error creating epoll fd: %m");
1310 goto exit;
1311 }
1312 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1313 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1314 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1315 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1316 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1317 log_error_errno(errno, "fail to add fds to epoll: %m");
1318 goto exit;
1319 }
1320
1321 for (;;) {
1322 static usec_t last_usec;
1323 struct epoll_event ev[8];
1324 int fdcount;
1325 int timeout;
1326 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1327 int i;
1328
1329 if (udev_exit) {
1330 /* close sources of new events and discard buffered events */
1331 if (fd_ctrl >= 0) {
1332 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1333 fd_ctrl = -1;
1334 }
1335 if (monitor != NULL) {
1336 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1337 udev_monitor_unref(monitor);
1338 monitor = NULL;
1339 }
1340 if (fd_inotify >= 0) {
1341 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1342 close(fd_inotify);
1343 fd_inotify = -1;
1344 }
1345
1346 /* discard queued events and kill workers */
1347 event_queue_cleanup(udev, EVENT_QUEUED);
1348 worker_kill(udev);
1349
1350 /* exit after all has cleaned up */
1351 if (udev_list_node_is_empty(&event_list) && children == 0)
1352 break;
1353
1354 /* timeout at exit for workers to finish */
1355 timeout = 30 * MSEC_PER_SEC;
1356 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1357 /* we are idle */
1358 timeout = -1;
1359
1360 /* cleanup possible left-over processes in our cgroup */
1361 if (udev_cgroup)
1362 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1363 } else {
1364 /* kill idle or hanging workers */
1365 timeout = 3 * MSEC_PER_SEC;
1366 }
1367
1368 /* tell settle that we are busy or idle */
1369 if (!udev_list_node_is_empty(&event_list)) {
1370 int fd;
1371
1372 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1373 if (fd >= 0)
1374 close(fd);
1375 } else {
1376 unlink("/run/udev/queue");
1377 }
1378
1379 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1380 if (fdcount < 0)
1381 continue;
1382
1383 if (fdcount == 0) {
1384 struct udev_list_node *loop;
1385
1386 /* timeout */
1387 if (udev_exit) {
1388 log_error("timeout, giving up waiting for workers to finish");
1389 break;
1390 }
1391
1392 /* kill idle workers */
1393 if (udev_list_node_is_empty(&event_list)) {
1394 log_debug("cleanup idle workers");
1395 worker_kill(udev);
1396 }
1397
1398 /* check for hanging events */
1399 udev_list_node_foreach(loop, &worker_list) {
1400 struct worker *worker = node_to_worker(loop);
1401 usec_t ts;
1402
1403 if (worker->state != WORKER_RUNNING)
1404 continue;
1405
1406 ts = now(CLOCK_MONOTONIC);
1407
1408 if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) {
1409 if ((ts - worker->event_start_usec) > arg_event_timeout_usec) {
1410 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1411 kill(worker->pid, SIGKILL);
1412 worker->state = WORKER_KILLED;
1413
1414 /* drop reference taken for state 'running' */
1415 worker_unref(worker);
1416 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1417 worker->event->exitcode = -64;
1418 event_queue_delete(worker->event);
1419 worker->event = NULL;
1420 } else if (!worker->event_warned) {
1421 log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
1422 worker->event_warned = true;
1423 }
1424 }
1425 }
1426
1427 }
1428
1429 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1430 for (i = 0; i < fdcount; i++) {
1431 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1432 is_worker = true;
1433 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1434 is_netlink = true;
1435 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1436 is_signal = true;
1437 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1438 is_inotify = true;
1439 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1440 is_ctrl = true;
1441 }
1442
1443 /* check for changed config, every 3 seconds at most */
1444 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1445 if (udev_rules_check_timestamp(rules))
1446 reload = true;
1447 if (udev_builtin_validate(udev))
1448 reload = true;
1449
1450 last_usec = now(CLOCK_MONOTONIC);
1451 }
1452
1453 /* reload requested, HUP signal received, rules changed, builtin changed */
1454 if (reload) {
1455 worker_kill(udev);
1456 rules = udev_rules_unref(rules);
1457 udev_builtin_exit(udev);
1458 reload = false;
1459 }
1460
1461 /* event has finished */
1462 if (is_worker)
1463 worker_returned(fd_worker);
1464
1465 if (is_netlink) {
1466 struct udev_device *dev;
1467
1468 dev = udev_monitor_receive_device(monitor);
1469 if (dev != NULL) {
1470 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1471 if (event_queue_insert(dev) < 0)
1472 udev_device_unref(dev);
1473 }
1474 }
1475
1476 /* start new events */
1477 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1478 udev_builtin_init(udev);
1479 if (rules == NULL)
1480 rules = udev_rules_new(udev, arg_resolve_names);
1481 if (rules != NULL)
1482 event_queue_start(udev);
1483 }
1484
1485 if (is_signal) {
1486 struct signalfd_siginfo fdsi;
1487 ssize_t size;
1488
1489 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1490 if (size == sizeof(struct signalfd_siginfo))
1491 handle_signal(udev, fdsi.ssi_signo);
1492 }
1493
1494 /* we are shutting down, the events below are not handled anymore */
1495 if (udev_exit)
1496 continue;
1497
1498 /* device node watch */
1499 if (is_inotify)
1500 handle_inotify(udev);
1501
1502 /*
1503 * This needs to be after the inotify handling, to make sure,
1504 * that the ping is send back after the possibly generated
1505 * "change" events by the inotify device node watch.
1506 *
1507 * A single time we may receive a client connection which we need to
1508 * keep open to block the client. It will be closed right before we
1509 * exit.
1510 */
1511 if (is_ctrl)
1512 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1513 }
1514
1515 rc = EXIT_SUCCESS;
1516 exit:
1517 udev_ctrl_cleanup(udev_ctrl);
1518 unlink("/run/udev/queue");
1519 exit_daemonize:
1520 if (fd_ep >= 0)
1521 close(fd_ep);
1522 worker_list_cleanup(udev);
1523 event_queue_cleanup(udev, EVENT_UNDEF);
1524 udev_rules_unref(rules);
1525 udev_builtin_exit(udev);
1526 if (fd_signal >= 0)
1527 close(fd_signal);
1528 if (worker_watch[READ_END] >= 0)
1529 close(worker_watch[READ_END]);
1530 if (worker_watch[WRITE_END] >= 0)
1531 close(worker_watch[WRITE_END]);
1532 udev_monitor_unref(monitor);
1533 udev_ctrl_connection_unref(ctrl_conn);
1534 udev_ctrl_unref(udev_ctrl);
1535 udev_list_cleanup(&properties_list);
1536 mac_selinux_finish();
1537 udev_unref(udev);
1538 log_close();
1539 return rc;
1540 }
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