]> git.ipfire.org Git - thirdparty/systemd.git/blob - src/udev/udevd.c
projects / thirdparty / systemd.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
udev: split out help and modernise a bit
[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 bool debug;
58
59 void udev_main_log(struct udev *udev, int priority,
60 const char *file, int line, const char *fn,
61 const char *format, va_list args) {
62 log_metav(priority, file, line, fn, format, args);
63 }
64
65 static struct udev_rules *rules;
66 static struct udev_ctrl *udev_ctrl;
67 static struct udev_monitor *monitor;
68 static int worker_watch[2] = { -1, -1 };
69 static int fd_signal = -1;
70 static int fd_ep = -1;
71 static int fd_inotify = -1;
72 static bool stop_exec_queue;
73 static bool reload;
74 static int children;
75 static int children_max;
76 static int exec_delay;
77 static usec_t event_timeout_usec = 180 * USEC_PER_SEC;
78 static usec_t event_timeout_warn_usec = 180 * USEC_PER_SEC / 3;
79 static sigset_t sigmask_orig;
80 static UDEV_LIST(event_list);
81 static UDEV_LIST(worker_list);
82 static char *udev_cgroup;
83 static bool udev_exit;
84
85 enum event_state {
86 EVENT_UNDEF,
87 EVENT_QUEUED,
88 EVENT_RUNNING,
89 };
90
91 struct event {
92 struct udev_list_node node;
93 struct udev *udev;
94 struct udev_device *dev;
95 enum event_state state;
96 int exitcode;
97 unsigned long long int delaying_seqnum;
98 unsigned long long int seqnum;
99 const char *devpath;
100 size_t devpath_len;
101 const char *devpath_old;
102 dev_t devnum;
103 int ifindex;
104 bool is_block;
105 };
106
107 static inline struct event *node_to_event(struct udev_list_node *node) {
108 return container_of(node, struct event, node);
109 }
110
111 static void event_queue_cleanup(struct udev *udev, enum event_state type);
112
113 enum worker_state {
114 WORKER_UNDEF,
115 WORKER_RUNNING,
116 WORKER_IDLE,
117 WORKER_KILLED,
118 };
119
120 struct worker {
121 struct udev_list_node node;
122 struct udev *udev;
123 int refcount;
124 pid_t pid;
125 struct udev_monitor *monitor;
126 enum worker_state state;
127 struct event *event;
128 usec_t event_start_usec;
129 bool event_warned;
130 };
131
132 /* passed from worker to main process */
133 struct worker_message {
134 pid_t pid;
135 int exitcode;
136 };
137
138 static inline struct worker *node_to_worker(struct udev_list_node *node) {
139 return container_of(node, struct worker, node);
140 }
141
142 static void event_queue_delete(struct event *event) {
143 udev_list_node_remove(&event->node);
144 udev_device_unref(event->dev);
145 free(event);
146 }
147
148 static struct worker *worker_ref(struct worker *worker) {
149 worker->refcount++;
150 return worker;
151 }
152
153 static void worker_cleanup(struct worker *worker) {
154 udev_list_node_remove(&worker->node);
155 udev_monitor_unref(worker->monitor);
156 children--;
157 free(worker);
158 }
159
160 static void worker_unref(struct worker *worker) {
161 worker->refcount--;
162 if (worker->refcount > 0)
163 return;
164 log_debug("worker [%u] cleaned up", worker->pid);
165 worker_cleanup(worker);
166 }
167
168 static void worker_list_cleanup(struct udev *udev) {
169 struct udev_list_node *loop, *tmp;
170
171 udev_list_node_foreach_safe(loop, tmp, &worker_list) {
172 struct worker *worker = node_to_worker(loop);
173
174 worker_cleanup(worker);
175 }
176 }
177
178 static void worker_new(struct event *event) {
179 struct udev *udev = event->udev;
180 struct worker *worker;
181 struct udev_monitor *worker_monitor;
182 pid_t pid;
183
184 /* listen for new events */
185 worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
186 if (worker_monitor == NULL)
187 return;
188 /* allow the main daemon netlink address to send devices to the worker */
189 udev_monitor_allow_unicast_sender(worker_monitor, monitor);
190 udev_monitor_enable_receiving(worker_monitor);
191
192 worker = new0(struct worker, 1);
193 if (worker == NULL) {
194 udev_monitor_unref(worker_monitor);
195 return;
196 }
197 /* worker + event reference */
198 worker->refcount = 2;
199 worker->udev = udev;
200
201 pid = fork();
202 switch (pid) {
203 case 0: {
204 struct udev_device *dev = NULL;
205 int fd_monitor;
206 _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
207 struct epoll_event ep_signal, ep_monitor;
208 sigset_t mask;
209 int rc = EXIT_SUCCESS;
210
211 /* take initial device from queue */
212 dev = event->dev;
213 event->dev = NULL;
214
215 free(worker);
216 worker_list_cleanup(udev);
217 event_queue_cleanup(udev, EVENT_UNDEF);
218 udev_monitor_unref(monitor);
219 udev_ctrl_unref(udev_ctrl);
220 close(fd_signal);
221 close(fd_ep);
222 close(worker_watch[READ_END]);
223
224 sigfillset(&mask);
225 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
226 if (fd_signal < 0) {
227 log_error("error creating signalfd %m");
228 rc = 2;
229 goto out;
230 }
231
232 fd_ep = epoll_create1(EPOLL_CLOEXEC);
233 if (fd_ep < 0) {
234 log_error("error creating epoll fd: %m");
235 rc = 3;
236 goto out;
237 }
238
239 memzero(&ep_signal, sizeof(struct epoll_event));
240 ep_signal.events = EPOLLIN;
241 ep_signal.data.fd = fd_signal;
242
243 fd_monitor = udev_monitor_get_fd(worker_monitor);
244 memzero(&ep_monitor, sizeof(struct epoll_event));
245 ep_monitor.events = EPOLLIN;
246 ep_monitor.data.fd = fd_monitor;
247
248 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
249 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
250 log_error("fail to add fds to epoll: %m");
251 rc = 4;
252 goto out;
253 }
254
255 /* request TERM signal if parent exits */
256 prctl(PR_SET_PDEATHSIG, SIGTERM);
257
258 /* reset OOM score, we only protect the main daemon */
259 write_string_file("/proc/self/oom_score_adj", "0");
260
261 for (;;) {
262 struct udev_event *udev_event;
263 struct worker_message msg;
264 int fd_lock = -1;
265 int err = 0;
266
267 log_debug("seq %llu running", udev_device_get_seqnum(dev));
268 udev_event = udev_event_new(dev);
269 if (udev_event == NULL) {
270 rc = 5;
271 goto out;
272 }
273
274 /* needed for SIGCHLD/SIGTERM in spawn() */
275 udev_event->fd_signal = fd_signal;
276
277 if (exec_delay > 0)
278 udev_event->exec_delay = exec_delay;
279
280 /*
281 * Take a shared lock on the device node; this establishes
282 * a concept of device "ownership" to serialize device
283 * access. External processes holding an exclusive lock will
284 * cause udev to skip the event handling; in the case udev
285 * acquired the lock, the external process can block until
286 * udev has finished its event handling.
287 */
288 if (!streq_ptr(udev_device_get_action(dev), "remove") &&
289 streq_ptr("block", udev_device_get_subsystem(dev)) &&
290 !startswith(udev_device_get_sysname(dev), "dm-") &&
291 !startswith(udev_device_get_sysname(dev), "md")) {
292 struct udev_device *d = dev;
293
294 if (streq_ptr("partition", udev_device_get_devtype(d)))
295 d = udev_device_get_parent(d);
296
297 if (d) {
298 fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
299 if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
300 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
301 err = -EWOULDBLOCK;
302 fd_lock = safe_close(fd_lock);
303 goto skip;
304 }
305 }
306 }
307
308 /* needed for renaming netifs */
309 udev_event->rtnl = rtnl;
310
311 /* apply rules, create node, symlinks */
312 udev_event_execute_rules(udev_event, event_timeout_usec, event_timeout_warn_usec, rules, &sigmask_orig);
313
314 udev_event_execute_run(udev_event, event_timeout_usec, event_timeout_warn_usec, &sigmask_orig);
315
316 /* in case rtnl was initialized */
317 rtnl = sd_rtnl_ref(udev_event->rtnl);
318
319 /* apply/restore inotify watch */
320 if (udev_event->inotify_watch) {
321 udev_watch_begin(udev, dev);
322 udev_device_update_db(dev);
323 }
324
325 safe_close(fd_lock);
326
327 /* send processed event back to libudev listeners */
328 udev_monitor_send_device(worker_monitor, NULL, dev);
329
330 skip:
331 /* send udevd the result of the event execution */
332 memzero(&msg, sizeof(struct worker_message));
333 msg.exitcode = err;
334 msg.pid = getpid();
335 send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
336
337 log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
338
339 udev_device_unref(dev);
340 dev = NULL;
341
342 if (udev_event->sigterm) {
343 udev_event_unref(udev_event);
344 goto out;
345 }
346
347 udev_event_unref(udev_event);
348
349 /* wait for more device messages from main udevd, or term signal */
350 while (dev == NULL) {
351 struct epoll_event ev[4];
352 int fdcount;
353 int i;
354
355 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
356 if (fdcount < 0) {
357 if (errno == EINTR)
358 continue;
359 log_error("failed to poll: %m");
360 goto out;
361 }
362
363 for (i = 0; i < fdcount; i++) {
364 if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
365 dev = udev_monitor_receive_device(worker_monitor);
366 break;
367 } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
368 struct signalfd_siginfo fdsi;
369 ssize_t size;
370
371 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
372 if (size != sizeof(struct signalfd_siginfo))
373 continue;
374 switch (fdsi.ssi_signo) {
375 case SIGTERM:
376 goto out;
377 }
378 }
379 }
380 }
381 }
382 out:
383 udev_device_unref(dev);
384 safe_close(fd_signal);
385 safe_close(fd_ep);
386 close(fd_inotify);
387 close(worker_watch[WRITE_END]);
388 udev_rules_unref(rules);
389 udev_builtin_exit(udev);
390 udev_monitor_unref(worker_monitor);
391 udev_unref(udev);
392 log_close();
393 exit(rc);
394 }
395 case -1:
396 udev_monitor_unref(worker_monitor);
397 event->state = EVENT_QUEUED;
398 free(worker);
399 log_error("fork of child failed: %m");
400 break;
401 default:
402 /* close monitor, but keep address around */
403 udev_monitor_disconnect(worker_monitor);
404 worker->monitor = worker_monitor;
405 worker->pid = pid;
406 worker->state = WORKER_RUNNING;
407 worker->event_start_usec = now(CLOCK_MONOTONIC);
408 worker->event_warned = false;
409 worker->event = event;
410 event->state = EVENT_RUNNING;
411 udev_list_node_append(&worker->node, &worker_list);
412 children++;
413 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
414 break;
415 }
416 }
417
418 static void event_run(struct event *event) {
419 struct udev_list_node *loop;
420
421 udev_list_node_foreach(loop, &worker_list) {
422 struct worker *worker = node_to_worker(loop);
423 ssize_t count;
424
425 if (worker->state != WORKER_IDLE)
426 continue;
427
428 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
429 if (count < 0) {
430 log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
431 kill(worker->pid, SIGKILL);
432 worker->state = WORKER_KILLED;
433 continue;
434 }
435 worker_ref(worker);
436 worker->event = event;
437 worker->state = WORKER_RUNNING;
438 worker->event_start_usec = now(CLOCK_MONOTONIC);
439 worker->event_warned = false;
440 event->state = EVENT_RUNNING;
441 return;
442 }
443
444 if (children >= children_max) {
445 if (children_max > 1)
446 log_debug("maximum number (%i) of children reached", children);
447 return;
448 }
449
450 /* start new worker and pass initial device */
451 worker_new(event);
452 }
453
454 static int event_queue_insert(struct udev_device *dev) {
455 struct event *event;
456
457 event = new0(struct event, 1);
458 if (event == NULL)
459 return -1;
460
461 event->udev = udev_device_get_udev(dev);
462 event->dev = dev;
463 event->seqnum = udev_device_get_seqnum(dev);
464 event->devpath = udev_device_get_devpath(dev);
465 event->devpath_len = strlen(event->devpath);
466 event->devpath_old = udev_device_get_devpath_old(dev);
467 event->devnum = udev_device_get_devnum(dev);
468 event->is_block = streq("block", udev_device_get_subsystem(dev));
469 event->ifindex = udev_device_get_ifindex(dev);
470
471 log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
472 udev_device_get_action(dev), udev_device_get_subsystem(dev));
473
474 event->state = EVENT_QUEUED;
475 udev_list_node_append(&event->node, &event_list);
476 return 0;
477 }
478
479 static void worker_kill(struct udev *udev) {
480 struct udev_list_node *loop;
481
482 udev_list_node_foreach(loop, &worker_list) {
483 struct worker *worker = node_to_worker(loop);
484
485 if (worker->state == WORKER_KILLED)
486 continue;
487
488 worker->state = WORKER_KILLED;
489 kill(worker->pid, SIGTERM);
490 }
491 }
492
493 /* lookup event for identical, parent, child device */
494 static bool is_devpath_busy(struct event *event) {
495 struct udev_list_node *loop;
496 size_t common;
497
498 /* check if queue contains events we depend on */
499 udev_list_node_foreach(loop, &event_list) {
500 struct event *loop_event = node_to_event(loop);
501
502 /* we already found a later event, earlier can not block us, no need to check again */
503 if (loop_event->seqnum < event->delaying_seqnum)
504 continue;
505
506 /* event we checked earlier still exists, no need to check again */
507 if (loop_event->seqnum == event->delaying_seqnum)
508 return true;
509
510 /* found ourself, no later event can block us */
511 if (loop_event->seqnum >= event->seqnum)
512 break;
513
514 /* check major/minor */
515 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
516 return true;
517
518 /* check network device ifindex */
519 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
520 return true;
521
522 /* check our old name */
523 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
524 event->delaying_seqnum = loop_event->seqnum;
525 return true;
526 }
527
528 /* compare devpath */
529 common = MIN(loop_event->devpath_len, event->devpath_len);
530
531 /* one devpath is contained in the other? */
532 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
533 continue;
534
535 /* identical device event found */
536 if (loop_event->devpath_len == event->devpath_len) {
537 /* devices names might have changed/swapped in the meantime */
538 if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
539 continue;
540 if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
541 continue;
542 event->delaying_seqnum = loop_event->seqnum;
543 return true;
544 }
545
546 /* parent device event found */
547 if (event->devpath[common] == '/') {
548 event->delaying_seqnum = loop_event->seqnum;
549 return true;
550 }
551
552 /* child device event found */
553 if (loop_event->devpath[common] == '/') {
554 event->delaying_seqnum = loop_event->seqnum;
555 return true;
556 }
557
558 /* no matching device */
559 continue;
560 }
561
562 return false;
563 }
564
565 static void event_queue_start(struct udev *udev) {
566 struct udev_list_node *loop;
567
568 udev_list_node_foreach(loop, &event_list) {
569 struct event *event = node_to_event(loop);
570
571 if (event->state != EVENT_QUEUED)
572 continue;
573
574 /* do not start event if parent or child event is still running */
575 if (is_devpath_busy(event))
576 continue;
577
578 event_run(event);
579 }
580 }
581
582 static void event_queue_cleanup(struct udev *udev, enum event_state match_type) {
583 struct udev_list_node *loop, *tmp;
584
585 udev_list_node_foreach_safe(loop, tmp, &event_list) {
586 struct event *event = node_to_event(loop);
587
588 if (match_type != EVENT_UNDEF && match_type != event->state)
589 continue;
590
591 event_queue_delete(event);
592 }
593 }
594
595 static void worker_returned(int fd_worker) {
596 for (;;) {
597 struct worker_message msg;
598 ssize_t size;
599 struct udev_list_node *loop;
600
601 size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT);
602 if (size != sizeof(struct worker_message))
603 break;
604
605 /* lookup worker who sent the signal */
606 udev_list_node_foreach(loop, &worker_list) {
607 struct worker *worker = node_to_worker(loop);
608
609 if (worker->pid != msg.pid)
610 continue;
611
612 /* worker returned */
613 if (worker->event) {
614 worker->event->exitcode = msg.exitcode;
615 event_queue_delete(worker->event);
616 worker->event = NULL;
617 }
618 if (worker->state != WORKER_KILLED)
619 worker->state = WORKER_IDLE;
620 worker_unref(worker);
621 break;
622 }
623 }
624 }
625
626 /* receive the udevd message from userspace */
627 static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) {
628 struct udev *udev = udev_ctrl_get_udev(uctrl);
629 struct udev_ctrl_connection *ctrl_conn;
630 struct udev_ctrl_msg *ctrl_msg = NULL;
631 const char *str;
632 int i;
633
634 ctrl_conn = udev_ctrl_get_connection(uctrl);
635 if (ctrl_conn == NULL)
636 goto out;
637
638 ctrl_msg = udev_ctrl_receive_msg(ctrl_conn);
639 if (ctrl_msg == NULL)
640 goto out;
641
642 i = udev_ctrl_get_set_log_level(ctrl_msg);
643 if (i >= 0) {
644 log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
645 log_set_max_level(i);
646 udev_set_log_priority(udev, 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 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 commandline, 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 if (r <= 0)
966 return;
967
968 FOREACH_WORD_QUOTED(word, l, line, state) {
969 char *s, *opt;
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 (startswith(opt, "udev.log-priority=")) {
982 int prio;
983
984 prio = util_log_priority(opt + 18);
985 log_set_max_level(prio);
986 udev_set_log_priority(udev, prio);
987 } else if (startswith(opt, "udev.children-max=")) {
988 children_max = strtoul(opt + 18, NULL, 0);
989 } else if (startswith(opt, "udev.exec-delay=")) {
990 exec_delay = strtoul(opt + 16, NULL, 0);
991 } else if (startswith(opt, "udev.event-timeout=")) {
992 event_timeout_usec = strtoul(opt + 16, NULL, 0) * USEC_PER_SEC;
993 event_timeout_warn_usec = (event_timeout_usec / 3) ? : 1;
994 }
995
996 free(s);
997 }
998 }
999
1000 static void help(void) {
1001 printf("%s [OPTIONS...]\n\n"
1002 "Manages devices.\n\n"
1003 " --daemon\n"
1004 " --debug\n"
1005 " --children-max=<maximum number of workers>\n"
1006 " --exec-delay=<seconds to wait before executing RUN=>\n"
1007 " --event-timeout=<seconds to wait before terminating an event>\n"
1008 " --resolve-names=early|late|never\n"
1009 " --version\n"
1010 " --help\n"
1011 , program_invocation_short_name);
1012 }
1013
1014 int main(int argc, char *argv[]) {
1015 struct udev *udev;
1016 sigset_t mask;
1017 int daemonize = false;
1018 int resolve_names = 1;
1019 static const struct option options[] = {
1020 { "daemon", no_argument, NULL, 'd' },
1021 { "debug", no_argument, NULL, 'D' },
1022 { "children-max", required_argument, NULL, 'c' },
1023 { "exec-delay", required_argument, NULL, 'e' },
1024 { "event-timeout", required_argument, NULL, 't' },
1025 { "resolve-names", required_argument, NULL, 'N' },
1026 { "help", no_argument, NULL, 'h' },
1027 { "version", no_argument, NULL, 'V' },
1028 {}
1029 };
1030 int fd_ctrl = -1;
1031 int fd_netlink = -1;
1032 int fd_worker = -1;
1033 struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1034 struct udev_ctrl_connection *ctrl_conn = NULL;
1035 int rc = 1;
1036
1037 udev = udev_new();
1038 if (udev == NULL)
1039 goto exit;
1040
1041 log_set_target(LOG_TARGET_AUTO);
1042 log_parse_environment();
1043 log_open();
1044
1045 udev_set_log_fn(udev, udev_main_log);
1046 log_set_max_level(udev_get_log_priority(udev));
1047
1048 log_debug("version %s", VERSION);
1049 label_init("/dev");
1050
1051 for (;;) {
1052 int option;
1053
1054 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1055 if (option == -1)
1056 break;
1057
1058 switch (option) {
1059 case 'd':
1060 daemonize = true;
1061 break;
1062 case 'c':
1063 children_max = strtoul(optarg, NULL, 0);
1064 break;
1065 case 'e':
1066 exec_delay = strtoul(optarg, NULL, 0);
1067 break;
1068 case 't':
1069 event_timeout_usec = strtoul(optarg, NULL, 0) * USEC_PER_SEC;
1070 event_timeout_warn_usec = (event_timeout_usec / 3) ? : 1;
1071 break;
1072 case 'D':
1073 debug = true;
1074 log_set_max_level(LOG_DEBUG);
1075 udev_set_log_priority(udev, LOG_DEBUG);
1076 break;
1077 case 'N':
1078 if (streq(optarg, "early")) {
1079 resolve_names = 1;
1080 } else if (streq(optarg, "late")) {
1081 resolve_names = 0;
1082 } else if (streq(optarg, "never")) {
1083 resolve_names = -1;
1084 } else {
1085 fprintf(stderr, "resolve-names must be early, late or never\n");
1086 log_error("resolve-names must be early, late or never");
1087 goto exit;
1088 }
1089 break;
1090 case 'h':
1091 help();
1092 goto exit;
1093 case 'V':
1094 printf("%s\n", VERSION);
1095 goto exit;
1096 default:
1097 goto exit;
1098 }
1099 }
1100
1101 kernel_cmdline_options(udev);
1102
1103 if (getuid() != 0) {
1104 fprintf(stderr, "root privileges required\n");
1105 log_error("root privileges required");
1106 goto exit;
1107 }
1108
1109 /* set umask before creating any file/directory */
1110 chdir("/");
1111 umask(022);
1112
1113 mkdir("/run/udev", 0755);
1114
1115 dev_setup(NULL);
1116
1117 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1118 if (daemonize) {
1119 int fd;
1120
1121 fd = open("/dev/null", O_RDWR);
1122 if (fd >= 0) {
1123 if (write(STDOUT_FILENO, 0, 0) < 0)
1124 dup2(fd, STDOUT_FILENO);
1125 if (write(STDERR_FILENO, 0, 0) < 0)
1126 dup2(fd, STDERR_FILENO);
1127 if (fd > STDERR_FILENO)
1128 close(fd);
1129 } else {
1130 fprintf(stderr, "cannot open /dev/null\n");
1131 log_error("cannot open /dev/null");
1132 }
1133 }
1134
1135 if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1136 /* get control and netlink socket from systemd */
1137 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1138 if (udev_ctrl == NULL) {
1139 log_error("error taking over udev control socket");
1140 rc = 1;
1141 goto exit;
1142 }
1143
1144 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1145 if (monitor == NULL) {
1146 log_error("error taking over netlink socket");
1147 rc = 3;
1148 goto exit;
1149 }
1150
1151 /* get our own cgroup, we regularly kill everything udev has left behind */
1152 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1153 udev_cgroup = NULL;
1154 } else {
1155 /* open control and netlink socket */
1156 udev_ctrl = udev_ctrl_new(udev);
1157 if (udev_ctrl == NULL) {
1158 fprintf(stderr, "error initializing udev control socket");
1159 log_error("error initializing udev control socket");
1160 rc = 1;
1161 goto exit;
1162 }
1163 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1164
1165 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1166 if (monitor == NULL) {
1167 fprintf(stderr, "error initializing netlink socket\n");
1168 log_error("error initializing netlink socket");
1169 rc = 3;
1170 goto exit;
1171 }
1172 fd_netlink = udev_monitor_get_fd(monitor);
1173 }
1174
1175 if (udev_monitor_enable_receiving(monitor) < 0) {
1176 fprintf(stderr, "error binding netlink socket\n");
1177 log_error("error binding netlink socket");
1178 rc = 3;
1179 goto exit;
1180 }
1181
1182 if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1183 fprintf(stderr, "error binding udev control socket\n");
1184 log_error("error binding udev control socket");
1185 rc = 1;
1186 goto exit;
1187 }
1188
1189 udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1190
1191 if (daemonize) {
1192 pid_t pid;
1193
1194 pid = fork();
1195 switch (pid) {
1196 case 0:
1197 break;
1198 case -1:
1199 log_error("fork of daemon failed: %m");
1200 rc = 4;
1201 goto exit;
1202 default:
1203 rc = EXIT_SUCCESS;
1204 goto exit_daemonize;
1205 }
1206
1207 setsid();
1208
1209 write_string_file("/proc/self/oom_score_adj", "-1000");
1210 } else {
1211 sd_notify(1, "READY=1");
1212 }
1213
1214 log_info("starting version " VERSION "\n");
1215
1216 if (!debug) {
1217 int fd;
1218
1219 fd = open("/dev/null", O_RDWR);
1220 if (fd >= 0) {
1221 dup2(fd, STDIN_FILENO);
1222 dup2(fd, STDOUT_FILENO);
1223 dup2(fd, STDERR_FILENO);
1224 close(fd);
1225 }
1226 }
1227
1228 fd_inotify = udev_watch_init(udev);
1229 if (fd_inotify < 0) {
1230 fprintf(stderr, "error initializing inotify\n");
1231 log_error("error initializing inotify");
1232 rc = 4;
1233 goto exit;
1234 }
1235 udev_watch_restore(udev);
1236
1237 /* block and listen to all signals on signalfd */
1238 sigfillset(&mask);
1239 sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1240 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1241 if (fd_signal < 0) {
1242 fprintf(stderr, "error creating signalfd\n");
1243 log_error("error creating signalfd");
1244 rc = 5;
1245 goto exit;
1246 }
1247
1248 /* unnamed socket from workers to the main daemon */
1249 if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1250 fprintf(stderr, "error creating socketpair\n");
1251 log_error("error creating socketpair");
1252 rc = 6;
1253 goto exit;
1254 }
1255 fd_worker = worker_watch[READ_END];
1256
1257 udev_builtin_init(udev);
1258
1259 rules = udev_rules_new(udev, resolve_names);
1260 if (rules == NULL) {
1261 log_error("error reading rules");
1262 goto exit;
1263 }
1264
1265 memzero(&ep_ctrl, sizeof(struct epoll_event));
1266 ep_ctrl.events = EPOLLIN;
1267 ep_ctrl.data.fd = fd_ctrl;
1268
1269 memzero(&ep_inotify, sizeof(struct epoll_event));
1270 ep_inotify.events = EPOLLIN;
1271 ep_inotify.data.fd = fd_inotify;
1272
1273 memzero(&ep_signal, sizeof(struct epoll_event));
1274 ep_signal.events = EPOLLIN;
1275 ep_signal.data.fd = fd_signal;
1276
1277 memzero(&ep_netlink, sizeof(struct epoll_event));
1278 ep_netlink.events = EPOLLIN;
1279 ep_netlink.data.fd = fd_netlink;
1280
1281 memzero(&ep_worker, sizeof(struct epoll_event));
1282 ep_worker.events = EPOLLIN;
1283 ep_worker.data.fd = fd_worker;
1284
1285 fd_ep = epoll_create1(EPOLL_CLOEXEC);
1286 if (fd_ep < 0) {
1287 log_error("error creating epoll fd: %m");
1288 goto exit;
1289 }
1290 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1291 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1292 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1293 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1294 epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1295 log_error("fail to add fds to epoll: %m");
1296 goto exit;
1297 }
1298
1299 if (children_max <= 0) {
1300 cpu_set_t cpu_set;
1301
1302 children_max = 8;
1303
1304 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1305 children_max += CPU_COUNT(&cpu_set) * 2;
1306 }
1307 }
1308 log_debug("set children_max to %u", children_max);
1309
1310 rc = udev_rules_apply_static_dev_perms(rules);
1311 if (rc < 0)
1312 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1313
1314 udev_list_node_init(&event_list);
1315 udev_list_node_init(&worker_list);
1316
1317 for (;;) {
1318 static usec_t last_usec;
1319 struct epoll_event ev[8];
1320 int fdcount;
1321 int timeout;
1322 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1323 int i;
1324
1325 if (udev_exit) {
1326 /* close sources of new events and discard buffered events */
1327 if (fd_ctrl >= 0) {
1328 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1329 fd_ctrl = -1;
1330 }
1331 if (monitor != NULL) {
1332 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1333 udev_monitor_unref(monitor);
1334 monitor = NULL;
1335 }
1336 if (fd_inotify >= 0) {
1337 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1338 close(fd_inotify);
1339 fd_inotify = -1;
1340 }
1341
1342 /* discard queued events and kill workers */
1343 event_queue_cleanup(udev, EVENT_QUEUED);
1344 worker_kill(udev);
1345
1346 /* exit after all has cleaned up */
1347 if (udev_list_node_is_empty(&event_list) && children == 0)
1348 break;
1349
1350 /* timeout at exit for workers to finish */
1351 timeout = 30 * MSEC_PER_SEC;
1352 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1353 /* we are idle */
1354 timeout = -1;
1355
1356 /* cleanup possible left-over processes in our cgroup */
1357 if (udev_cgroup)
1358 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1359 } else {
1360 /* kill idle or hanging workers */
1361 timeout = 3 * MSEC_PER_SEC;
1362 }
1363
1364 /* tell settle that we are busy or idle */
1365 if (!udev_list_node_is_empty(&event_list)) {
1366 int fd;
1367
1368 fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1369 if (fd >= 0)
1370 close(fd);
1371 } else {
1372 unlink("/run/udev/queue");
1373 }
1374
1375 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1376 if (fdcount < 0)
1377 continue;
1378
1379 if (fdcount == 0) {
1380 struct udev_list_node *loop;
1381
1382 /* timeout */
1383 if (udev_exit) {
1384 log_error("timeout, giving up waiting for workers to finish");
1385 break;
1386 }
1387
1388 /* kill idle workers */
1389 if (udev_list_node_is_empty(&event_list)) {
1390 log_debug("cleanup idle workers");
1391 worker_kill(udev);
1392 }
1393
1394 /* check for hanging events */
1395 udev_list_node_foreach(loop, &worker_list) {
1396 struct worker *worker = node_to_worker(loop);
1397 usec_t ts;
1398
1399 if (worker->state != WORKER_RUNNING)
1400 continue;
1401
1402 ts = now(CLOCK_MONOTONIC);
1403
1404 if ((ts - worker->event_start_usec) > event_timeout_warn_usec) {
1405 if ((ts - worker->event_start_usec) > event_timeout_usec) {
1406 log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1407 kill(worker->pid, SIGKILL);
1408 worker->state = WORKER_KILLED;
1409
1410 /* drop reference taken for state 'running' */
1411 worker_unref(worker);
1412 log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1413 worker->event->exitcode = -64;
1414 event_queue_delete(worker->event);
1415 worker->event = NULL;
1416 } else if (!worker->event_warned) {
1417 log_warning("worker [%u] %s is taking a long time", worker->pid, worker->event->devpath);
1418 worker->event_warned = true;
1419 }
1420 }
1421 }
1422
1423 }
1424
1425 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1426 for (i = 0; i < fdcount; i++) {
1427 if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1428 is_worker = true;
1429 else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1430 is_netlink = true;
1431 else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1432 is_signal = true;
1433 else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1434 is_inotify = true;
1435 else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1436 is_ctrl = true;
1437 }
1438
1439 /* check for changed config, every 3 seconds at most */
1440 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1441 if (udev_rules_check_timestamp(rules))
1442 reload = true;
1443 if (udev_builtin_validate(udev))
1444 reload = true;
1445
1446 last_usec = now(CLOCK_MONOTONIC);
1447 }
1448
1449 /* reload requested, HUP signal received, rules changed, builtin changed */
1450 if (reload) {
1451 worker_kill(udev);
1452 rules = udev_rules_unref(rules);
1453 udev_builtin_exit(udev);
1454 reload = false;
1455 }
1456
1457 /* event has finished */
1458 if (is_worker)
1459 worker_returned(fd_worker);
1460
1461 if (is_netlink) {
1462 struct udev_device *dev;
1463
1464 dev = udev_monitor_receive_device(monitor);
1465 if (dev != NULL) {
1466 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1467 if (event_queue_insert(dev) < 0)
1468 udev_device_unref(dev);
1469 }
1470 }
1471
1472 /* start new events */
1473 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1474 udev_builtin_init(udev);
1475 if (rules == NULL)
1476 rules = udev_rules_new(udev, resolve_names);
1477 if (rules != NULL)
1478 event_queue_start(udev);
1479 }
1480
1481 if (is_signal) {
1482 struct signalfd_siginfo fdsi;
1483 ssize_t size;
1484
1485 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1486 if (size == sizeof(struct signalfd_siginfo))
1487 handle_signal(udev, fdsi.ssi_signo);
1488 }
1489
1490 /* we are shutting down, the events below are not handled anymore */
1491 if (udev_exit)
1492 continue;
1493
1494 /* device node watch */
1495 if (is_inotify)
1496 handle_inotify(udev);
1497
1498 /*
1499 * This needs to be after the inotify handling, to make sure,
1500 * that the ping is send back after the possibly generated
1501 * "change" events by the inotify device node watch.
1502 *
1503 * A single time we may receive a client connection which we need to
1504 * keep open to block the client. It will be closed right before we
1505 * exit.
1506 */
1507 if (is_ctrl)
1508 ctrl_conn = handle_ctrl_msg(udev_ctrl);
1509 }
1510
1511 rc = EXIT_SUCCESS;
1512 exit:
1513 udev_ctrl_cleanup(udev_ctrl);
1514 unlink("/run/udev/queue");
1515 exit_daemonize:
1516 if (fd_ep >= 0)
1517 close(fd_ep);
1518 worker_list_cleanup(udev);
1519 event_queue_cleanup(udev, EVENT_UNDEF);
1520 udev_rules_unref(rules);
1521 udev_builtin_exit(udev);
1522 if (fd_signal >= 0)
1523 close(fd_signal);
1524 if (worker_watch[READ_END] >= 0)
1525 close(worker_watch[READ_END]);
1526 if (worker_watch[WRITE_END] >= 0)
1527 close(worker_watch[WRITE_END]);
1528 udev_monitor_unref(monitor);
1529 udev_ctrl_connection_unref(ctrl_conn);
1530 udev_ctrl_unref(udev_ctrl);
1531 label_finish();
1532 udev_unref(udev);
1533 log_close();
1534 return rc;
1535 }
Unnamed repository; edit this file 'description' to name the repository.