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udevd: parse_argv - warn if argumens are invalid
[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 udev_set_log_priority(udev, i);
648 worker_kill(udev);
649 }
650
651 if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
652 log_debug("udevd message (STOP_EXEC_QUEUE) received");
653 stop_exec_queue = true;
654 }
655
656 if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
657 log_debug("udevd message (START_EXEC_QUEUE) received");
658 stop_exec_queue = false;
659 }
660
661 if (udev_ctrl_get_reload(ctrl_msg) > 0) {
662 log_debug("udevd message (RELOAD) received");
663 reload = true;
664 }
665
666 str = udev_ctrl_get_set_env(ctrl_msg);
667 if (str != NULL) {
668 char *key;
669
670 key = strdup(str);
671 if (key != NULL) {
672 char *val;
673
674 val = strchr(key, '=');
675 if (val != NULL) {
676 val[0] = '\0';
677 val = &val[1];
678 if (val[0] == '\0') {
679 log_debug("udevd message (ENV) received, unset '%s'", key);
680 udev_add_property(udev, key, NULL);
681 } else {
682 log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
683 udev_add_property(udev, key, val);
684 }
685 } else {
686 log_error("wrong key format '%s'", key);
687 }
688 free(key);
689 }
690 worker_kill(udev);
691 }
692
693 i = udev_ctrl_get_set_children_max(ctrl_msg);
694 if (i >= 0) {
695 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
696 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 commandline, in case we need to get into debug mode
953 * udev.log-priority=<level> syslog priority
954 * udev.children-max=<number of workers> events are fully serialized if set to 1
955 * udev.exec-delay=<number of seconds> delay execution of every executed program
956 */
957 static void kernel_cmdline_options(struct udev *udev) {
958 _cleanup_free_ char *line = NULL;
959 const char *word, *state;
960 size_t l;
961 int r;
962
963 r = proc_cmdline(&line);
964 if (r < 0)
965 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
966 if (r <= 0)
967 return;
968
969 FOREACH_WORD_QUOTED(word, l, line, state) {
970 char *s, *opt;
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 (startswith(opt, "udev.log-priority=")) {
983 int prio;
984
985 prio = util_log_priority(opt + 18);
986 log_set_max_level(prio);
987 udev_set_log_priority(udev, prio);
988 } else if (startswith(opt, "udev.children-max=")) {
989 r = safe_atoi(opt + 18, &arg_children_max);
990 if (r < 0)
991 log_warning("Invalid udev.children-max ignored: %s", opt + 18);
992 } else if (startswith(opt, "udev.exec-delay=")) {
993 r = safe_atoi(opt + 16, &arg_exec_delay);
994 if (r < 0)
995 log_warning("Invalid udev.exec-delay ignored: %s", opt + 16);
996 } else if (startswith(opt, "udev.event-timeout=")) {
997 r = safe_atou64(opt + 16, &arg_event_timeout_usec);
998 if (r < 0) {
999 log_warning("Invalid udev.event-timeout ignored: %s", opt + 16);
1000 break;
1001 }
1002 arg_event_timeout_usec *= USEC_PER_SEC;
1003 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1004 }
1005
1006 free(s);
1007 }
1008 }
1009
1010 static void help(void) {
1011 printf("%s [OPTIONS...]\n\n"
1012 "Manages devices.\n\n"
1013 " --daemon\n"
1014 " --debug\n"
1015 " --children-max=<maximum number of workers>\n"
1016 " --exec-delay=<seconds to wait before executing RUN=>\n"
1017 " --event-timeout=<seconds to wait before terminating an event>\n"
1018 " --resolve-names=early|late|never\n"
1019 " --version\n"
1020 " --help\n"
1021 , program_invocation_short_name);
1022 }
1023
1024 static int parse_argv(int argc, char *argv[]) {
1025 static const struct option options[] = {
1026 { "daemon", no_argument, NULL, 'd' },
1027 { "debug", no_argument, NULL, 'D' },
1028 { "children-max", required_argument, NULL, 'c' },
1029 { "exec-delay", required_argument, NULL, 'e' },
1030 { "event-timeout", required_argument, NULL, 't' },
1031 { "resolve-names", required_argument, NULL, 'N' },
1032 { "help", no_argument, NULL, 'h' },
1033 { "version", no_argument, NULL, 'V' },
1034 {}
1035 };
1036
1037 int c;
1038
1039 assert(argc >= 0);
1040 assert(argv);
1041
1042 while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) {
1043 int r;
1044
1045 switch (c) {
1046
1047 case 'd':
1048 arg_daemonize = true;
1049 break;
1050 case 'c':
1051 r = safe_atoi(optarg, &arg_children_max);
1052 if (r < 0)
1053 log_warning("Invalid --children-max ignored: %s", optarg);
1054 break;
1055 case 'e':
1056 r = safe_atoi(optarg, &arg_exec_delay);
1057 if (r < 0)
1058 log_warning("Invalid --exec-delay ignored: %s", optarg);
1059 break;
1060 case 't':
1061 r = safe_atou64(optarg, &arg_event_timeout_usec);
1062 if (r < 0)
1063 log_warning("Invalig --event-timeout ignored: %s", optarg);
1064 else {
1065 arg_event_timeout_usec *= USEC_PER_SEC;
1066 arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
1067 }
1068 break;
1069 case 'D':
1070 arg_debug = true;
1071 break;
1072 case 'N':
1073 if (streq(optarg, "early")) {
1074 arg_resolve_names = 1;
1075 } else if (streq(optarg, "late")) {
1076 arg_resolve_names = 0;
1077 } else if (streq(optarg, "never")) {
1078 arg_resolve_names = -1;
1079 } else {
1080 log_error("resolve-names must be early, late or never");
1081 return 0;
1082 }
1083 break;
1084 case 'h':
1085 help();
1086 return 0;
1087 case 'V':
1088 printf("%s\n", VERSION);
1089 return 0;
1090 case '?':
1091 return -EINVAL;
1092 default:
1093 assert_not_reached("Unhandled option");
1094
1095 }
1096 }
1097
1098 return 1;
1099 }
1100
1101 int main(int argc, char *argv[]) {
1102 struct udev *udev;
1103 sigset_t mask;
1104 int fd_ctrl = -1;
1105 int fd_netlink = -1;
1106 int fd_worker = -1;
1107 struct epoll_event ep_ctrl = { .events = EPOLLIN };
1108 struct epoll_event ep_inotify = { .events = EPOLLIN };
1109 struct epoll_event ep_signal = { .events = EPOLLIN };
1110 struct epoll_event ep_netlink = { .events = EPOLLIN };
1111 struct epoll_event ep_worker = { .events = EPOLLIN };
1112 struct udev_ctrl_connection *ctrl_conn = NULL;
1113 int rc = 1, r;
1114
1115 udev = udev_new();
1116 if (udev == NULL)
1117 goto exit;
1118
1119 log_set_target(LOG_TARGET_AUTO);
1120 log_parse_environment();
1121 log_open();
1122
1123 udev_set_log_fn(udev, udev_main_log);
1124 log_set_max_level(udev_get_log_priority(udev));
1125
1126 r = parse_argv(argc, argv);
1127 if (r <= 0)
1128 goto exit;
1129
1130 kernel_cmdline_options(udev);
1131
1132 if (arg_debug) {
1133 log_set_max_level(LOG_DEBUG);
1134 udev_set_log_priority(udev, LOG_DEBUG);
1135 }
1136
1137 if (getuid() != 0) {
1138 log_error("root privileges required");
1139 goto exit;
1140 }
1141
1142 label_init("/dev");
1143
1144 /* set umask before creating any file/directory */
1145 chdir("/");
1146 umask(022);
1147
1148 mkdir("/run/udev", 0755);
1149
1150 dev_setup(NULL);
1151
1152 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1153 if (arg_daemonize) {
1154 int fd;
1155
1156 fd = open("/dev/null", O_RDWR);
1157 if (fd >= 0) {
1158 if (write(STDOUT_FILENO, 0, 0) < 0)
1159 dup2(fd, STDOUT_FILENO);
1160 if (write(STDERR_FILENO, 0, 0) < 0)
1161 dup2(fd, STDERR_FILENO);
1162 if (fd > STDERR_FILENO)
1163 close(fd);
1164 } else {
1165 log_error("cannot open /dev/null");
1166 }
1167 }
1168
1169 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1170 /* get control and netlink socket from systemd */
1171 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1172 if (udev_ctrl == NULL) {
1173 log_error("error taking over udev control socket");
1174 rc = 1;
1175 goto exit;
1176 }
1177
1178 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1179 if (monitor == NULL) {
1180 log_error("error taking over netlink socket");
1181 rc = 3;
1182 goto exit;
1183 }
1184
1185 /* get our own cgroup, we regularly kill everything udev has left behind */
1186 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1187 udev_cgroup = NULL;
1188 } else {
1189 /* open control and netlink socket */
1190 udev_ctrl = udev_ctrl_new(udev);
1191 if (udev_ctrl == NULL) {
1192 log_error("error initializing udev control socket");
1193 rc = 1;
1194 goto exit;
1195 }
1196 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1197
1198 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1199 if (monitor == NULL) {
1200 log_error("error initializing netlink socket");
1201 rc = 3;
1202 goto exit;
1203 }
1204 fd_netlink = udev_monitor_get_fd(monitor);
1205 }
1206
1207 if (udev_monitor_enable_receiving(monitor) < 0) {
1208 log_error("error binding netlink socket");
1209 rc = 3;
1210 goto exit;
1211 }
1212
1213 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1214 log_error("error binding udev control socket");
1215 rc = 1;
1216 goto exit;
1217 }
1218
1219 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1220
1221 log_info("starting version " VERSION "\n");
1222
1223 udev_builtin_init(udev);
1224
1225 rules = udev_rules_new(udev, arg_resolve_names);
1226 if (rules == NULL) {
1227 log_error("error reading rules");
1228 goto exit;
1229 }
1230
1231 rc = udev_rules_apply_static_dev_perms(rules);
1232 if (rc < 0)
1233 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1234
1235 if (arg_daemonize) {
1236 pid_t pid;
1237
1238 pid = fork();
1239 switch (pid) {
1240 case 0:
1241 break;
1242 case -1:
1243 log_error("fork of daemon failed: %m");
1244 rc = 4;
1245 goto exit;
1246 default:
1247 rc = EXIT_SUCCESS;
1248 goto exit_daemonize;
1249 }
1250
1251 setsid();
1252
1253 write_string_file("/proc/self/oom_score_adj", "-1000");
1254 } else {
1255 sd_notify(1, "READY=1");
1256 }
1257
1258 if (arg_children_max <= 0) {
1259 cpu_set_t cpu_set;
1260
1261 arg_children_max = 8;
1262
1263 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1264 arg_children_max += CPU_COUNT(&cpu_set) * 2;
1265 }
1266 }
1267 log_debug("set children_max to %u", arg_children_max);
1268
1269 udev_list_node_init(&event_list);
1270 udev_list_node_init(&worker_list);
1271
1272 fd_inotify = udev_watch_init(udev);
1273 if (fd_inotify < 0) {
1274 log_error("error initializing inotify");
1275 rc = 4;
1276 goto exit;
1277 }
1278 udev_watch_restore(udev);
1279
1280 /* block and listen to all signals on signalfd */
1281 sigfillset(&mask);
1282 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1283 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1284 if (fd_signal < 0) {
1285 log_error("error creating signalfd");
1286 rc = 5;
1287 goto exit;
1288 }
1289
1290 /* unnamed socket from workers to the main daemon */
1291 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1292 log_error("error creating socketpair");
1293 rc = 6;
1294 goto exit;
1295 }
1296 fd_worker = worker_watch[READ_END];
1297
1298 ep_ctrl.data.fd = fd_ctrl;
1299 ep_inotify.data.fd = fd_inotify;
1300 ep_signal.data.fd = fd_signal;
1301 ep_netlink.data.fd = fd_netlink;
1302 ep_worker.data.fd = fd_worker;
1303
1304 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1305 if (fd_ep < 0) {
1306 log_error("error creating epoll fd: %m");
1307 goto exit;
1308 }
1309 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1310 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1311 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1312 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1313 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1314 log_error("fail to add fds to epoll: %m");
1315 goto exit;
1316 }
1317
1318 for (;;) {
1319 static usec_t last_usec;
1320 struct epoll_event ev[8];
1321 int fdcount;
1322 int timeout;
1323 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1324 int i;
1325
1326 if (udev_exit) {
1327 /* close sources of new events and discard buffered events */
1328 if (fd_ctrl >= 0) {
1329 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1330 fd_ctrl = -1;
1331 }
1332 if (monitor != NULL) {
1333 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1334 udev_monitor_unref(monitor);
1335 monitor = NULL;
1336 }
1337 if (fd_inotify >= 0) {
1338 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1339 close(fd_inotify);
1340 fd_inotify = -1;
1341 }
1342
1343 /* discard queued events and kill workers */
1344 event_queue_cleanup(udev, EVENT_QUEUED);
1345 worker_kill(udev);
1346
1347 /* exit after all has cleaned up */
1348 if (udev_list_node_is_empty(&event_list) && children == 0)
1349 break;
1350
1351 /* timeout at exit for workers to finish */
1352 timeout = 30 * MSEC_PER_SEC;
1353 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1354 /* we are idle */
1355 timeout = -1;
1356
1357 /* cleanup possible left-over processes in our cgroup */
1358 if (udev_cgroup)
1359 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1360 } else {
1361 /* kill idle or hanging workers */
1362 timeout = 3 * MSEC_PER_SEC;
1363 }
1364
1365 /* tell settle that we are busy or idle */
1366 if (!udev_list_node_is_empty(&event_list)) {
1367 int fd;
1368
1369 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1370 if (fd >= 0)
1371 close(fd);
1372 } else {
1373 unlink("/run/udev/queue");
1374 }
1375
1376 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1377 if (fdcount < 0)
1378 continue;
1379
1380 if (fdcount == 0) {
1381 struct udev_list_node *loop;
1382
1383 /* timeout */
1384 if (udev_exit) {
1385 log_error("timeout, giving up waiting for workers to finish");
1386 break;
1387 }
1388
1389 /* kill idle workers */
1390 if (udev_list_node_is_empty(&event_list)) {
1391 log_debug("cleanup idle workers");
1392 worker_kill(udev);
1393 }
1394
1395 /* check for hanging events */
1396 udev_list_node_foreach(loop, &worker_list) {
1397 struct worker *worker = node_to_worker(loop);
1398 usec_t ts;
1399
1400 if (worker->state != WORKER_RUNNING)
1401 continue;
1402
1403 ts = now(CLOCK_MONOTONIC);
1404
1405 if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) {
1406 if ((ts - worker->event_start_usec) > arg_event_timeout_usec) {
1407 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1408 kill(worker->pid, SIGKILL);
1409 worker->state = WORKER_KILLED;
1410
1411 /* drop reference taken for state 'running' */
1412 worker_unref(worker);
1413 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1414 worker->event->exitcode = -64;
1415 event_queue_delete(worker->event);
1416 worker->event = NULL;
1417 } else if (!worker->event_warned) {
1418 log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
1419 worker->event_warned = true;
1420 }
1421 }
1422 }
1423
1424 }
1425
1426 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1427 for (i = 0; i < fdcount; i++) {
1428 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1429 is_worker = true;
1430 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1431 is_netlink = true;
1432 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1433 is_signal = true;
1434 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1435 is_inotify = true;
1436 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1437 is_ctrl = true;
1438 }
1439
1440 /* check for changed config, every 3 seconds at most */
1441 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1442 if (udev_rules_check_timestamp(rules))
1443 reload = true;
1444 if (udev_builtin_validate(udev))
1445 reload = true;
1446
1447 last_usec = now(CLOCK_MONOTONIC);
1448 }
1449
1450 /* reload requested, HUP signal received, rules changed, builtin changed */
1451 if (reload) {
1452 worker_kill(udev);
1453 rules = udev_rules_unref(rules);
1454 udev_builtin_exit(udev);
1455 reload = false;
1456 }
1457
1458 /* event has finished */
1459 if (is_worker)
1460 worker_returned(fd_worker);
1461
1462 if (is_netlink) {
1463 struct udev_device *dev;
1464
1465 dev = udev_monitor_receive_device(monitor);
1466 if (dev != NULL) {
1467 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1468 if (event_queue_insert(dev) < 0)
1469 udev_device_unref(dev);
1470 }
1471 }
1472
1473 /* start new events */
1474 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1475 udev_builtin_init(udev);
1476 if (rules == NULL)
1477 rules = udev_rules_new(udev, arg_resolve_names);
1478 if (rules != NULL)
1479 event_queue_start(udev);
1480 }
1481
1482 if (is_signal) {
1483 struct signalfd_siginfo fdsi;
1484 ssize_t size;
1485
1486 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1487 if (size == sizeof(struct signalfd_siginfo))
1488 handle_signal(udev, fdsi.ssi_signo);
1489 }
1490
1491 /* we are shutting down, the events below are not handled anymore */
1492 if (udev_exit)
1493 continue;
1494
1495 /* device node watch */
1496 if (is_inotify)
1497 handle_inotify(udev);
1498
1499 /*
1500 * This needs to be after the inotify handling, to make sure,
1501 * that the ping is send back after the possibly generated
1502 * "change" events by the inotify device node watch.
1503 *
1504 * A single time we may receive a client connection which we need to
1505 * keep open to block the client. It will be closed right before we
1506 * exit.
1507 */
1508 if (is_ctrl)
1509 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1510 }
1511
1512 rc = EXIT_SUCCESS;
1513 exit:
1514 udev_ctrl_cleanup(udev_ctrl);
1515 unlink("/run/udev/queue");
1516 exit_daemonize:
1517 if (fd_ep >= 0)
1518 close(fd_ep);
1519 worker_list_cleanup(udev);
1520 event_queue_cleanup(udev, EVENT_UNDEF);
1521 udev_rules_unref(rules);
1522 udev_builtin_exit(udev);
1523 if (fd_signal >= 0)
1524 close(fd_signal);
1525 if (worker_watch[READ_END] >= 0)
1526 close(worker_watch[READ_END]);
1527 if (worker_watch[WRITE_END] >= 0)
1528 close(worker_watch[WRITE_END]);
1529 udev_monitor_unref(monitor);
1530 udev_ctrl_connection_unref(ctrl_conn);
1531 udev_ctrl_unref(udev_ctrl);
1532 label_finish();
1533 udev_unref(udev);
1534 log_close();
1535 return rc;
1536 }
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