chiark / gitweb /
completion: filter templates from restartable units
[elogind.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 "sd-daemon.h"
52 #include "cgroup-util.h"
53 #include "dev-setup.h"
54 #include "fileio.h"
55
56 static bool debug;
57
58 void udev_main_log(struct udev *udev, int priority,
59                    const char *file, int line, const char *fn,
60                    const char *format, va_list args) {
61         log_metav(priority, file, line, fn, format, args);
62 }
63
64 static struct udev_rules *rules;
65 static struct udev_ctrl *udev_ctrl;
66 static struct udev_monitor *monitor;
67 static int worker_watch[2] = { -1, -1 };
68 static int fd_signal = -1;
69 static int fd_ep = -1;
70 static int fd_inotify = -1;
71 static bool stop_exec_queue;
72 static bool reload;
73 static int children;
74 static int children_max;
75 static int exec_delay;
76 static usec_t event_timeout_usec = 30 * USEC_PER_SEC;
77 static sigset_t sigmask_orig;
78 static UDEV_LIST(event_list);
79 static UDEV_LIST(worker_list);
80 static char *udev_cgroup;
81 static bool udev_exit;
82
83 enum event_state {
84         EVENT_UNDEF,
85         EVENT_QUEUED,
86         EVENT_RUNNING,
87 };
88
89 struct event {
90         struct udev_list_node node;
91         struct udev *udev;
92         struct udev_device *dev;
93         enum event_state state;
94         int exitcode;
95         unsigned long long int delaying_seqnum;
96         unsigned long long int seqnum;
97         const char *devpath;
98         size_t devpath_len;
99         const char *devpath_old;
100         dev_t devnum;
101         int ifindex;
102         bool is_block;
103 #ifdef HAVE_FIRMWARE
104         bool nodelay;
105 #endif
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 };
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                 struct epoll_event ep_signal, ep_monitor;
207                 sigset_t mask;
208                 int rc = EXIT_SUCCESS;
209
210                 /* take initial device from queue */
211                 dev = event->dev;
212                 event->dev = NULL;
213
214                 free(worker);
215                 worker_list_cleanup(udev);
216                 event_queue_cleanup(udev, EVENT_UNDEF);
217                 udev_monitor_unref(monitor);
218                 udev_ctrl_unref(udev_ctrl);
219                 close(fd_signal);
220                 close(fd_ep);
221                 close(worker_watch[READ_END]);
222
223                 sigfillset(&mask);
224                 fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
225                 if (fd_signal < 0) {
226                         log_error("error creating signalfd %m");
227                         rc = 2;
228                         goto out;
229                 }
230
231                 fd_ep = epoll_create1(EPOLL_CLOEXEC);
232                 if (fd_ep < 0) {
233                         log_error("error creating epoll fd: %m");
234                         rc = 3;
235                         goto out;
236                 }
237
238                 memzero(&ep_signal, sizeof(struct epoll_event));
239                 ep_signal.events = EPOLLIN;
240                 ep_signal.data.fd = fd_signal;
241
242                 fd_monitor = udev_monitor_get_fd(worker_monitor);
243                 memzero(&ep_monitor, sizeof(struct epoll_event));
244                 ep_monitor.events = EPOLLIN;
245                 ep_monitor.data.fd = fd_monitor;
246
247                 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
248                     epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
249                         log_error("fail to add fds to epoll: %m");
250                         rc = 4;
251                         goto out;
252                 }
253
254                 /* request TERM signal if parent exits */
255                 prctl(PR_SET_PDEATHSIG, SIGTERM);
256
257                 /* reset OOM score, we only protect the main daemon */
258                 write_string_file("/proc/self/oom_score_adj", "0");
259
260                 for (;;) {
261                         struct udev_event *udev_event;
262                         struct worker_message msg;
263                         int fd_lock = -1;
264                         int err = 0;
265
266                         log_debug("seq %llu running", udev_device_get_seqnum(dev));
267                         udev_event = udev_event_new(dev);
268                         if (udev_event == NULL) {
269                                 rc = 5;
270                                 goto out;
271                         }
272
273                         /* needed for SIGCHLD/SIGTERM in spawn() */
274                         udev_event->fd_signal = fd_signal;
275
276                         if (exec_delay > 0)
277                                 udev_event->exec_delay = exec_delay;
278
279                         /*
280                          * Take a shared lock on the device node; this establishes
281                          * a concept of device "ownership" to serialize device
282                          * access. External processes holding an exclusive lock will
283                          * cause udev to skip the event handling; in the case udev
284                          * acquired the lock, the external process can block until
285                          * udev has finished its event handling.
286                          */
287                         if (!streq_ptr(udev_device_get_action(dev), "remove") &&
288                             streq_ptr("block", udev_device_get_subsystem(dev)) &&
289                             !startswith(udev_device_get_sysname(dev), "dm-") &&
290                             !startswith(udev_device_get_sysname(dev), "md")) {
291                                 struct udev_device *d = dev;
292
293                                 if (streq_ptr("partition", udev_device_get_devtype(d)))
294                                         d = udev_device_get_parent(d);
295
296                                 if (d) {
297                                         fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
298                                         if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
299                                                 log_debug("Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
300                                                 err = -EWOULDBLOCK;
301                                                 fd_lock = safe_close(fd_lock);
302                                                 goto skip;
303                                         }
304                                 }
305                         }
306
307                         /* apply rules, create node, symlinks */
308                         udev_event_execute_rules(udev_event, event_timeout_usec, rules, &sigmask_orig);
309
310                         udev_event_execute_run(udev_event, event_timeout_usec, &sigmask_orig);
311
312                         /* apply/restore inotify watch */
313                         if (udev_event->inotify_watch) {
314                                 udev_watch_begin(udev, dev);
315                                 udev_device_update_db(dev);
316                         }
317
318                         safe_close(fd_lock);
319
320                         /* send processed event back to libudev listeners */
321                         udev_monitor_send_device(worker_monitor, NULL, dev);
322
323 skip:
324                         /* send udevd the result of the event execution */
325                         memzero(&msg, sizeof(struct worker_message));
326                         msg.exitcode = err;
327                         msg.pid = getpid();
328                         send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0);
329
330                         log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err);
331
332                         udev_device_unref(dev);
333                         dev = NULL;
334
335                         if (udev_event->sigterm) {
336                                 udev_event_unref(udev_event);
337                                 goto out;
338                         }
339
340                         udev_event_unref(udev_event);
341
342                         /* wait for more device messages from main udevd, or term signal */
343                         while (dev == NULL) {
344                                 struct epoll_event ev[4];
345                                 int fdcount;
346                                 int i;
347
348                                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
349                                 if (fdcount < 0) {
350                                         if (errno == EINTR)
351                                                 continue;
352                                         log_error("failed to poll: %m");
353                                         goto out;
354                                 }
355
356                                 for (i = 0; i < fdcount; i++) {
357                                         if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
358                                                 dev = udev_monitor_receive_device(worker_monitor);
359                                                 break;
360                                         } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
361                                                 struct signalfd_siginfo fdsi;
362                                                 ssize_t size;
363
364                                                 size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
365                                                 if (size != sizeof(struct signalfd_siginfo))
366                                                         continue;
367                                                 switch (fdsi.ssi_signo) {
368                                                 case SIGTERM:
369                                                         goto out;
370                                                 }
371                                         }
372                                 }
373                         }
374                 }
375 out:
376                 udev_device_unref(dev);
377                 safe_close(fd_signal);
378                 safe_close(fd_ep);
379                 close(fd_inotify);
380                 close(worker_watch[WRITE_END]);
381                 udev_rules_unref(rules);
382                 udev_builtin_exit(udev);
383                 udev_monitor_unref(worker_monitor);
384                 udev_unref(udev);
385                 log_close();
386                 exit(rc);
387         }
388         case -1:
389                 udev_monitor_unref(worker_monitor);
390                 event->state = EVENT_QUEUED;
391                 free(worker);
392                 log_error("fork of child failed: %m");
393                 break;
394         default:
395                 /* close monitor, but keep address around */
396                 udev_monitor_disconnect(worker_monitor);
397                 worker->monitor = worker_monitor;
398                 worker->pid = pid;
399                 worker->state = WORKER_RUNNING;
400                 worker->event_start_usec = now(CLOCK_MONOTONIC);
401                 worker->event = event;
402                 event->state = EVENT_RUNNING;
403                 udev_list_node_append(&worker->node, &worker_list);
404                 children++;
405                 log_debug("seq %llu forked new worker [%u]", udev_device_get_seqnum(event->dev), pid);
406                 break;
407         }
408 }
409
410 static void event_run(struct event *event) {
411         struct udev_list_node *loop;
412
413         udev_list_node_foreach(loop, &worker_list) {
414                 struct worker *worker = node_to_worker(loop);
415                 ssize_t count;
416
417                 if (worker->state != WORKER_IDLE)
418                         continue;
419
420                 count = udev_monitor_send_device(monitor, worker->monitor, event->dev);
421                 if (count < 0) {
422                         log_error("worker [%u] did not accept message %zi (%m), kill it", worker->pid, count);
423                         kill(worker->pid, SIGKILL);
424                         worker->state = WORKER_KILLED;
425                         continue;
426                 }
427                 worker_ref(worker);
428                 worker->event = event;
429                 worker->state = WORKER_RUNNING;
430                 worker->event_start_usec = now(CLOCK_MONOTONIC);
431                 event->state = EVENT_RUNNING;
432                 return;
433         }
434
435         if (children >= children_max) {
436                 if (children_max > 1)
437                         log_debug("maximum number (%i) of children reached", children);
438                 return;
439         }
440
441         /* start new worker and pass initial device */
442         worker_new(event);
443 }
444
445 static int event_queue_insert(struct udev_device *dev) {
446         struct event *event;
447
448         event = new0(struct event, 1);
449         if (event == NULL)
450                 return -1;
451
452         event->udev = udev_device_get_udev(dev);
453         event->dev = dev;
454         event->seqnum = udev_device_get_seqnum(dev);
455         event->devpath = udev_device_get_devpath(dev);
456         event->devpath_len = strlen(event->devpath);
457         event->devpath_old = udev_device_get_devpath_old(dev);
458         event->devnum = udev_device_get_devnum(dev);
459         event->is_block = streq("block", udev_device_get_subsystem(dev));
460         event->ifindex = udev_device_get_ifindex(dev);
461 #ifdef HAVE_FIRMWARE
462         if (streq(udev_device_get_subsystem(dev), "firmware"))
463                 event->nodelay = true;
464 #endif
465
466         log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
467              udev_device_get_action(dev), udev_device_get_subsystem(dev));
468
469         event->state = EVENT_QUEUED;
470         udev_list_node_append(&event->node, &event_list);
471         return 0;
472 }
473
474 static void worker_kill(struct udev *udev) {
475         struct udev_list_node *loop;
476
477         udev_list_node_foreach(loop, &worker_list) {
478                 struct worker *worker = node_to_worker(loop);
479
480                 if (worker->state == WORKER_KILLED)
481                         continue;
482
483                 worker->state = WORKER_KILLED;
484                 kill(worker->pid, SIGTERM);
485         }
486 }
487
488 /* lookup event for identical, parent, child device */
489 static bool is_devpath_busy(struct event *event) {
490         struct udev_list_node *loop;
491         size_t common;
492
493         /* check if queue contains events we depend on */
494         udev_list_node_foreach(loop, &event_list) {
495                 struct event *loop_event = node_to_event(loop);
496
497                 /* we already found a later event, earlier can not block us, no need to check again */
498                 if (loop_event->seqnum < event->delaying_seqnum)
499                         continue;
500
501                 /* event we checked earlier still exists, no need to check again */
502                 if (loop_event->seqnum == event->delaying_seqnum)
503                         return true;
504
505                 /* found ourself, no later event can block us */
506                 if (loop_event->seqnum >= event->seqnum)
507                         break;
508
509                 /* check major/minor */
510                 if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
511                         return true;
512
513                 /* check network device ifindex */
514                 if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
515                         return true;
516
517                 /* check our old name */
518                 if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
519                         event->delaying_seqnum = loop_event->seqnum;
520                         return true;
521                 }
522
523                 /* compare devpath */
524                 common = MIN(loop_event->devpath_len, event->devpath_len);
525
526                 /* one devpath is contained in the other? */
527                 if (memcmp(loop_event->devpath, event->devpath, common) != 0)
528                         continue;
529
530                 /* identical device event found */
531                 if (loop_event->devpath_len == event->devpath_len) {
532                         /* devices names might have changed/swapped in the meantime */
533                         if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
534                                 continue;
535                         if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
536                                 continue;
537                         event->delaying_seqnum = loop_event->seqnum;
538                         return true;
539                 }
540
541 #ifdef HAVE_FIRMWARE
542                 /* allow to bypass the dependency tracking */
543                 if (event->nodelay)
544                         continue;
545 #endif
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                 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                         children_max = strtoul(opt + 18, NULL, 0);
990                 } else if (startswith(opt, "udev.exec-delay=")) {
991                         exec_delay = strtoul(opt + 16, NULL, 0);
992                 } else if (startswith(opt, "udev.event-timeout=")) {
993                         event_timeout_usec = strtoul(opt + 16, NULL, 0) * USEC_PER_SEC;
994                 }
995
996                 free(s);
997         }
998 }
999
1000 int main(int argc, char *argv[]) {
1001         struct udev *udev;
1002         sigset_t mask;
1003         int daemonize = false;
1004         int resolve_names = 1;
1005         static const struct option options[] = {
1006                 { "daemon", no_argument, NULL, 'd' },
1007                 { "debug", no_argument, NULL, 'D' },
1008                 { "children-max", required_argument, NULL, 'c' },
1009                 { "exec-delay", required_argument, NULL, 'e' },
1010                 { "event-timeout", required_argument, NULL, 't' },
1011                 { "resolve-names", required_argument, NULL, 'N' },
1012                 { "help", no_argument, NULL, 'h' },
1013                 { "version", no_argument, NULL, 'V' },
1014                 {}
1015         };
1016         int fd_ctrl = -1;
1017         int fd_netlink = -1;
1018         int fd_worker = -1;
1019         struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker;
1020         struct udev_ctrl_connection *ctrl_conn = NULL;
1021         int rc = 1;
1022
1023         udev = udev_new();
1024         if (udev == NULL)
1025                 goto exit;
1026
1027         log_set_target(LOG_TARGET_AUTO);
1028         log_parse_environment();
1029         log_open();
1030
1031         udev_set_log_fn(udev, udev_main_log);
1032         log_set_max_level(udev_get_log_priority(udev));
1033
1034         log_debug("version %s", VERSION);
1035         label_init("/dev");
1036
1037         for (;;) {
1038                 int option;
1039
1040                 option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL);
1041                 if (option == -1)
1042                         break;
1043
1044                 switch (option) {
1045                 case 'd':
1046                         daemonize = true;
1047                         break;
1048                 case 'c':
1049                         children_max = strtoul(optarg, NULL, 0);
1050                         break;
1051                 case 'e':
1052                         exec_delay = strtoul(optarg, NULL, 0);
1053                         break;
1054                 case 't':
1055                         event_timeout_usec = strtoul(optarg, NULL, 0) * USEC_PER_SEC;
1056                         break;
1057                 case 'D':
1058                         debug = true;
1059                         log_set_max_level(LOG_DEBUG);
1060                         udev_set_log_priority(udev, LOG_DEBUG);
1061                         break;
1062                 case 'N':
1063                         if (streq(optarg, "early")) {
1064                                 resolve_names = 1;
1065                         } else if (streq(optarg, "late")) {
1066                                 resolve_names = 0;
1067                         } else if (streq(optarg, "never")) {
1068                                 resolve_names = -1;
1069                         } else {
1070                                 fprintf(stderr, "resolve-names must be early, late or never\n");
1071                                 log_error("resolve-names must be early, late or never");
1072                                 goto exit;
1073                         }
1074                         break;
1075                 case 'h':
1076                         printf("Usage: udevd OPTIONS\n"
1077                                "  --daemon\n"
1078                                "  --debug\n"
1079                                "  --children-max=<maximum number of workers>\n"
1080                                "  --exec-delay=<seconds to wait before executing RUN=>\n"
1081                                "  --event-timeout=<seconds to wait before terminating an event>\n"
1082                                "  --resolve-names=early|late|never\n"
1083                                "  --version\n"
1084                                "  --help\n"
1085                                "\n");
1086                         goto exit;
1087                 case 'V':
1088                         printf("%s\n", VERSION);
1089                         goto exit;
1090                 default:
1091                         goto exit;
1092                 }
1093         }
1094
1095         kernel_cmdline_options(udev);
1096
1097         if (getuid() != 0) {
1098                 fprintf(stderr, "root privileges required\n");
1099                 log_error("root privileges required");
1100                 goto exit;
1101         }
1102
1103         /* set umask before creating any file/directory */
1104         chdir("/");
1105         umask(022);
1106
1107         mkdir("/run/udev", 0755);
1108
1109         dev_setup(NULL);
1110
1111         /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1112         if (daemonize) {
1113                 int fd;
1114
1115                 fd = open("/dev/null", O_RDWR);
1116                 if (fd >= 0) {
1117                         if (write(STDOUT_FILENO, 0, 0) < 0)
1118                                 dup2(fd, STDOUT_FILENO);
1119                         if (write(STDERR_FILENO, 0, 0) < 0)
1120                                 dup2(fd, STDERR_FILENO);
1121                         if (fd > STDERR_FILENO)
1122                                 close(fd);
1123                 } else {
1124                         fprintf(stderr, "cannot open /dev/null\n");
1125                         log_error("cannot open /dev/null");
1126                 }
1127         }
1128
1129         if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) {
1130                 /* get control and netlink socket from systemd */
1131                 udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl);
1132                 if (udev_ctrl == NULL) {
1133                         log_error("error taking over udev control socket");
1134                         rc = 1;
1135                         goto exit;
1136                 }
1137
1138                 monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink);
1139                 if (monitor == NULL) {
1140                         log_error("error taking over netlink socket");
1141                         rc = 3;
1142                         goto exit;
1143                 }
1144
1145                 /* get our own cgroup, we regularly kill everything udev has left behind */
1146                 if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0)
1147                         udev_cgroup = NULL;
1148         } else {
1149                 /* open control and netlink socket */
1150                 udev_ctrl = udev_ctrl_new(udev);
1151                 if (udev_ctrl == NULL) {
1152                         fprintf(stderr, "error initializing udev control socket");
1153                         log_error("error initializing udev control socket");
1154                         rc = 1;
1155                         goto exit;
1156                 }
1157                 fd_ctrl = udev_ctrl_get_fd(udev_ctrl);
1158
1159                 monitor = udev_monitor_new_from_netlink(udev, "kernel");
1160                 if (monitor == NULL) {
1161                         fprintf(stderr, "error initializing netlink socket\n");
1162                         log_error("error initializing netlink socket");
1163                         rc = 3;
1164                         goto exit;
1165                 }
1166                 fd_netlink = udev_monitor_get_fd(monitor);
1167         }
1168
1169         if (udev_monitor_enable_receiving(monitor) < 0) {
1170                 fprintf(stderr, "error binding netlink socket\n");
1171                 log_error("error binding netlink socket");
1172                 rc = 3;
1173                 goto exit;
1174         }
1175
1176         if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
1177                 fprintf(stderr, "error binding udev control socket\n");
1178                 log_error("error binding udev control socket");
1179                 rc = 1;
1180                 goto exit;
1181         }
1182
1183         udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
1184
1185         if (daemonize) {
1186                 pid_t pid;
1187
1188                 pid = fork();
1189                 switch (pid) {
1190                 case 0:
1191                         break;
1192                 case -1:
1193                         log_error("fork of daemon failed: %m");
1194                         rc = 4;
1195                         goto exit;
1196                 default:
1197                         rc = EXIT_SUCCESS;
1198                         goto exit_daemonize;
1199                 }
1200
1201                 setsid();
1202
1203                 write_string_file("/proc/self/oom_score_adj", "-1000");
1204         } else {
1205                 sd_notify(1, "READY=1");
1206         }
1207
1208         print_kmsg("starting version " VERSION "\n");
1209
1210         if (!debug) {
1211                 int fd;
1212
1213                 fd = open("/dev/null", O_RDWR);
1214                 if (fd >= 0) {
1215                         dup2(fd, STDIN_FILENO);
1216                         dup2(fd, STDOUT_FILENO);
1217                         dup2(fd, STDERR_FILENO);
1218                         close(fd);
1219                 }
1220         }
1221
1222         fd_inotify = udev_watch_init(udev);
1223         if (fd_inotify < 0) {
1224                 fprintf(stderr, "error initializing inotify\n");
1225                 log_error("error initializing inotify");
1226                 rc = 4;
1227                 goto exit;
1228         }
1229         udev_watch_restore(udev);
1230
1231         /* block and listen to all signals on signalfd */
1232         sigfillset(&mask);
1233         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
1234         fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
1235         if (fd_signal < 0) {
1236                 fprintf(stderr, "error creating signalfd\n");
1237                 log_error("error creating signalfd");
1238                 rc = 5;
1239                 goto exit;
1240         }
1241
1242         /* unnamed socket from workers to the main daemon */
1243         if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) {
1244                 fprintf(stderr, "error creating socketpair\n");
1245                 log_error("error creating socketpair");
1246                 rc = 6;
1247                 goto exit;
1248         }
1249         fd_worker = worker_watch[READ_END];
1250
1251         udev_builtin_init(udev);
1252
1253         rules = udev_rules_new(udev, resolve_names);
1254         if (rules == NULL) {
1255                 log_error("error reading rules");
1256                 goto exit;
1257         }
1258
1259         memzero(&ep_ctrl, sizeof(struct epoll_event));
1260         ep_ctrl.events = EPOLLIN;
1261         ep_ctrl.data.fd = fd_ctrl;
1262
1263         memzero(&ep_inotify, sizeof(struct epoll_event));
1264         ep_inotify.events = EPOLLIN;
1265         ep_inotify.data.fd = fd_inotify;
1266
1267         memzero(&ep_signal, sizeof(struct epoll_event));
1268         ep_signal.events = EPOLLIN;
1269         ep_signal.data.fd = fd_signal;
1270
1271         memzero(&ep_netlink, sizeof(struct epoll_event));
1272         ep_netlink.events = EPOLLIN;
1273         ep_netlink.data.fd = fd_netlink;
1274
1275         memzero(&ep_worker, sizeof(struct epoll_event));
1276         ep_worker.events = EPOLLIN;
1277         ep_worker.data.fd = fd_worker;
1278
1279         fd_ep = epoll_create1(EPOLL_CLOEXEC);
1280         if (fd_ep < 0) {
1281                 log_error("error creating epoll fd: %m");
1282                 goto exit;
1283         }
1284         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 ||
1285             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 ||
1286             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
1287             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 ||
1288             epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) {
1289                 log_error("fail to add fds to epoll: %m");
1290                 goto exit;
1291         }
1292
1293         if (children_max <= 0) {
1294                 cpu_set_t cpu_set;
1295
1296                 children_max = 8;
1297
1298                 if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) {
1299                         children_max +=  CPU_COUNT(&cpu_set) * 2;
1300                 }
1301         }
1302         log_debug("set children_max to %u", children_max);
1303
1304         rc = udev_rules_apply_static_dev_perms(rules);
1305         if (rc < 0)
1306                 log_error("failed to apply permissions on static device nodes - %s", strerror(-rc));
1307
1308         udev_list_node_init(&event_list);
1309         udev_list_node_init(&worker_list);
1310
1311         for (;;) {
1312                 static usec_t last_usec;
1313                 struct epoll_event ev[8];
1314                 int fdcount;
1315                 int timeout;
1316                 bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl;
1317                 int i;
1318
1319                 if (udev_exit) {
1320                         /* close sources of new events and discard buffered events */
1321                         if (fd_ctrl >= 0) {
1322                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL);
1323                                 fd_ctrl = -1;
1324                         }
1325                         if (monitor != NULL) {
1326                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL);
1327                                 udev_monitor_unref(monitor);
1328                                 monitor = NULL;
1329                         }
1330                         if (fd_inotify >= 0) {
1331                                 epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL);
1332                                 close(fd_inotify);
1333                                 fd_inotify = -1;
1334                         }
1335
1336                         /* discard queued events and kill workers */
1337                         event_queue_cleanup(udev, EVENT_QUEUED);
1338                         worker_kill(udev);
1339
1340                         /* exit after all has cleaned up */
1341                         if (udev_list_node_is_empty(&event_list) && children == 0)
1342                                 break;
1343
1344                         /* timeout at exit for workers to finish */
1345                         timeout = 30 * MSEC_PER_SEC;
1346                 } else if (udev_list_node_is_empty(&event_list) && children == 0) {
1347                         /* we are idle */
1348                         timeout = -1;
1349
1350                         /* cleanup possible left-over processes in our cgroup */
1351                         if (udev_cgroup)
1352                                 cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL);
1353                 } else {
1354                         /* kill idle or hanging workers */
1355                         timeout = 3 * MSEC_PER_SEC;
1356                 }
1357
1358                 /* tell settle that we are busy or idle */
1359                 if (!udev_list_node_is_empty(&event_list)) {
1360                         int fd;
1361
1362                         fd = open("/run/udev/queue", O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
1363                         if (fd >= 0)
1364                                 close(fd);
1365                 } else {
1366                         unlink("/run/udev/queue");
1367                 }
1368
1369                 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
1370                 if (fdcount < 0)
1371                         continue;
1372
1373                 if (fdcount == 0) {
1374                         struct udev_list_node *loop;
1375
1376                         /* timeout */
1377                         if (udev_exit) {
1378                                 log_error("timeout, giving up waiting for workers to finish");
1379                                 break;
1380                         }
1381
1382                         /* kill idle workers */
1383                         if (udev_list_node_is_empty(&event_list)) {
1384                                 log_debug("cleanup idle workers");
1385                                 worker_kill(udev);
1386                         }
1387
1388                         /* check for hanging events */
1389                         udev_list_node_foreach(loop, &worker_list) {
1390                                 struct worker *worker = node_to_worker(loop);
1391
1392                                 if (worker->state != WORKER_RUNNING)
1393                                         continue;
1394
1395                                 if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > event_timeout_usec) {
1396                                         log_error("worker [%u] %s timeout; kill it", worker->pid, worker->event->devpath);
1397                                         kill(worker->pid, SIGKILL);
1398                                         worker->state = WORKER_KILLED;
1399
1400                                         /* drop reference taken for state 'running' */
1401                                         worker_unref(worker);
1402                                         log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath);
1403                                         worker->event->exitcode = -64;
1404                                         event_queue_delete(worker->event);
1405                                         worker->event = NULL;
1406                                 }
1407                         }
1408
1409                 }
1410
1411                 is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false;
1412                 for (i = 0; i < fdcount; i++) {
1413                         if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN)
1414                                 is_worker = true;
1415                         else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN)
1416                                 is_netlink = true;
1417                         else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN)
1418                                 is_signal = true;
1419                         else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN)
1420                                 is_inotify = true;
1421                         else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN)
1422                                 is_ctrl = true;
1423                 }
1424
1425                 /* check for changed config, every 3 seconds at most */
1426                 if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) {
1427                         if (udev_rules_check_timestamp(rules))
1428                                 reload = true;
1429                         if (udev_builtin_validate(udev))
1430                                 reload = true;
1431
1432                         last_usec = now(CLOCK_MONOTONIC);
1433                 }
1434
1435                 /* reload requested, HUP signal received, rules changed, builtin changed */
1436                 if (reload) {
1437                         worker_kill(udev);
1438                         rules = udev_rules_unref(rules);
1439                         udev_builtin_exit(udev);
1440                         reload = false;
1441                 }
1442
1443                 /* event has finished */
1444                 if (is_worker)
1445                         worker_returned(fd_worker);
1446
1447                 if (is_netlink) {
1448                         struct udev_device *dev;
1449
1450                         dev = udev_monitor_receive_device(monitor);
1451                         if (dev != NULL) {
1452                                 udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC));
1453                                 if (event_queue_insert(dev) < 0)
1454                                         udev_device_unref(dev);
1455                         }
1456                 }
1457
1458                 /* start new events */
1459                 if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) {
1460                         udev_builtin_init(udev);
1461                         if (rules == NULL)
1462                                 rules = udev_rules_new(udev, resolve_names);
1463                         if (rules != NULL)
1464                                 event_queue_start(udev);
1465                 }
1466
1467                 if (is_signal) {
1468                         struct signalfd_siginfo fdsi;
1469                         ssize_t size;
1470
1471                         size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
1472                         if (size == sizeof(struct signalfd_siginfo))
1473                                 handle_signal(udev, fdsi.ssi_signo);
1474                 }
1475
1476                 /* we are shutting down, the events below are not handled anymore */
1477                 if (udev_exit)
1478                         continue;
1479
1480                 /* device node watch */
1481                 if (is_inotify)
1482                         handle_inotify(udev);
1483
1484                 /*
1485                  * This needs to be after the inotify handling, to make sure,
1486                  * that the ping is send back after the possibly generated
1487                  * "change" events by the inotify device node watch.
1488                  *
1489                  * A single time we may receive a client connection which we need to
1490                  * keep open to block the client. It will be closed right before we
1491                  * exit.
1492                  */
1493                 if (is_ctrl)
1494                         ctrl_conn = handle_ctrl_msg(udev_ctrl);
1495         }
1496
1497         rc = EXIT_SUCCESS;
1498 exit:
1499         udev_ctrl_cleanup(udev_ctrl);
1500         unlink("/run/udev/queue");
1501 exit_daemonize:
1502         if (fd_ep >= 0)
1503                 close(fd_ep);
1504         worker_list_cleanup(udev);
1505         event_queue_cleanup(udev, EVENT_UNDEF);
1506         udev_rules_unref(rules);
1507         udev_builtin_exit(udev);
1508         if (fd_signal >= 0)
1509                 close(fd_signal);
1510         if (worker_watch[READ_END] >= 0)
1511                 close(worker_watch[READ_END]);
1512         if (worker_watch[WRITE_END] >= 0)
1513                 close(worker_watch[WRITE_END]);
1514         udev_monitor_unref(monitor);
1515         udev_ctrl_connection_unref(ctrl_conn);
1516         udev_ctrl_unref(udev_ctrl);
1517         label_finish();
1518         udev_unref(udev);
1519         log_close();
1520         return rc;
1521 }