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>
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.
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.
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/>.
35 #include <sys/prctl.h>
36 #include <sys/socket.h>
38 #include <sys/signalfd.h>
39 #include <sys/epoll.h>
43 #include <sys/ioctl.h>
44 #include <sys/inotify.h>
45 #include <sys/utsname.h>
48 #include "sd-daemon.h"
49 #include "cgroup-util.h"
50 #include "dev-setup.h"
54 void udev_main_log(struct udev
*udev
, int priority
,
55 const char *file
, int line
, const char *fn
,
56 const char *format
, va_list args
)
58 log_metav(priority
, file
, line
, fn
, format
, args
);
61 static struct udev_rules
*rules
;
62 static struct udev_queue_export
*udev_queue_export
;
63 static struct udev_ctrl
*udev_ctrl
;
64 static struct udev_monitor
*monitor
;
65 static int worker_watch
[2] = { -1, -1 };
66 static int fd_signal
= -1;
67 static int fd_ep
= -1;
68 static int fd_inotify
= -1;
69 static bool stop_exec_queue
;
72 static int children_max
;
73 static int exec_delay
;
74 static sigset_t sigmask_orig
;
75 static UDEV_LIST(event_list
);
76 static UDEV_LIST(worker_list
);
78 static bool udev_exit
;
87 struct udev_list_node node
;
89 struct udev_device
*dev
;
90 enum event_state state
;
92 unsigned long long int delaying_seqnum
;
93 unsigned long long int seqnum
;
96 const char *devpath_old
;
103 static inline struct event
*node_to_event(struct udev_list_node
*node
)
105 return container_of(node
, struct event
, node
);
108 static void event_queue_cleanup(struct udev
*udev
, enum event_state type
);
118 struct udev_list_node node
;
122 struct udev_monitor
*monitor
;
123 enum worker_state state
;
125 usec_t event_start_usec
;
128 /* passed from worker to main process */
129 struct worker_message
{
134 static inline struct worker
*node_to_worker(struct udev_list_node
*node
)
136 return container_of(node
, struct worker
, node
);
139 static void event_queue_delete(struct event
*event
, bool export
)
141 udev_list_node_remove(&event
->node
);
144 udev_queue_export_device_finished(udev_queue_export
, event
->dev
);
145 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event
->dev
), event
->exitcode
);
147 udev_device_unref(event
->dev
);
151 static struct worker
*worker_ref(struct worker
*worker
)
157 static void worker_cleanup(struct worker
*worker
)
159 udev_list_node_remove(&worker
->node
);
160 udev_monitor_unref(worker
->monitor
);
165 static void worker_unref(struct worker
*worker
)
168 if (worker
->refcount
> 0)
170 log_debug("worker [%u] cleaned up\n", worker
->pid
);
171 worker_cleanup(worker
);
174 static void worker_list_cleanup(struct udev
*udev
)
176 struct udev_list_node
*loop
, *tmp
;
178 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
179 struct worker
*worker
= node_to_worker(loop
);
181 worker_cleanup(worker
);
185 static void worker_new(struct event
*event
)
187 struct udev
*udev
= event
->udev
;
188 struct worker
*worker
;
189 struct udev_monitor
*worker_monitor
;
192 /* listen for new events */
193 worker_monitor
= udev_monitor_new_from_netlink(udev
, NULL
);
194 if (worker_monitor
== NULL
)
196 /* allow the main daemon netlink address to send devices to the worker */
197 udev_monitor_allow_unicast_sender(worker_monitor
, monitor
);
198 udev_monitor_enable_receiving(worker_monitor
);
200 worker
= calloc(1, sizeof(struct worker
));
201 if (worker
== NULL
) {
202 udev_monitor_unref(worker_monitor
);
205 /* worker + event reference */
206 worker
->refcount
= 2;
212 struct udev_device
*dev
= NULL
;
214 struct epoll_event ep_signal
, ep_monitor
;
216 int rc
= EXIT_SUCCESS
;
218 /* take initial device from queue */
223 worker_list_cleanup(udev
);
224 event_queue_cleanup(udev
, EVENT_UNDEF
);
225 udev_queue_export_unref(udev_queue_export
);
226 udev_monitor_unref(monitor
);
227 udev_ctrl_unref(udev_ctrl
);
230 close(worker_watch
[READ_END
]);
233 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
235 log_error("error creating signalfd %m\n");
240 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
242 log_error("error creating epoll fd: %m\n");
247 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
248 ep_signal
.events
= EPOLLIN
;
249 ep_signal
.data
.fd
= fd_signal
;
251 fd_monitor
= udev_monitor_get_fd(worker_monitor
);
252 memset(&ep_monitor
, 0, sizeof(struct epoll_event
));
253 ep_monitor
.events
= EPOLLIN
;
254 ep_monitor
.data
.fd
= fd_monitor
;
256 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
257 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_monitor
, &ep_monitor
) < 0) {
258 log_error("fail to add fds to epoll: %m\n");
263 /* request TERM signal if parent exits */
264 prctl(PR_SET_PDEATHSIG
, SIGTERM
);
266 /* reset OOM score, we only protect the main daemon */
267 write_one_line_file("/proc/self/oom_score_adj", "0");
270 struct udev_event
*udev_event
;
271 struct worker_message msg
;
274 log_debug("seq %llu running\n", udev_device_get_seqnum(dev
));
275 udev_event
= udev_event_new(dev
);
276 if (udev_event
== NULL
) {
281 /* needed for SIGCHLD/SIGTERM in spawn() */
282 udev_event
->fd_signal
= fd_signal
;
285 udev_event
->exec_delay
= exec_delay
;
287 /* apply rules, create node, symlinks */
288 err
= udev_event_execute_rules(udev_event
, rules
, &sigmask_orig
);
291 udev_event_execute_run(udev_event
, &sigmask_orig
);
293 /* apply/restore inotify watch */
294 if (err
== 0 && udev_event
->inotify_watch
) {
295 udev_watch_begin(udev
, dev
);
296 udev_device_update_db(dev
);
299 /* send processed event back to libudev listeners */
300 udev_monitor_send_device(worker_monitor
, NULL
, dev
);
302 /* send udevd the result of the event execution */
303 memset(&msg
, 0, sizeof(struct worker_message
));
307 send(worker_watch
[WRITE_END
], &msg
, sizeof(struct worker_message
), 0);
309 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev
), err
);
311 udev_device_unref(dev
);
314 if (udev_event
->sigterm
) {
315 udev_event_unref(udev_event
);
319 udev_event_unref(udev_event
);
321 /* wait for more device messages from main udevd, or term signal */
322 while (dev
== NULL
) {
323 struct epoll_event ev
[4];
327 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), -1);
331 log_error("failed to poll: %m\n");
335 for (i
= 0; i
< fdcount
; i
++) {
336 if (ev
[i
].data
.fd
== fd_monitor
&& ev
[i
].events
& EPOLLIN
) {
337 dev
= udev_monitor_receive_device(worker_monitor
);
339 } else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
) {
340 struct signalfd_siginfo fdsi
;
343 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
344 if (size
!= sizeof(struct signalfd_siginfo
))
346 switch (fdsi
.ssi_signo
) {
355 udev_device_unref(dev
);
361 close(worker_watch
[WRITE_END
]);
362 udev_rules_unref(rules
);
363 udev_builtin_exit(udev
);
364 udev_monitor_unref(worker_monitor
);
370 udev_monitor_unref(worker_monitor
);
371 event
->state
= EVENT_QUEUED
;
373 log_error("fork of child failed: %m\n");
376 /* close monitor, but keep address around */
377 udev_monitor_disconnect(worker_monitor
);
378 worker
->monitor
= worker_monitor
;
380 worker
->state
= WORKER_RUNNING
;
381 worker
->event_start_usec
= now(CLOCK_MONOTONIC
);
382 worker
->event
= event
;
383 event
->state
= EVENT_RUNNING
;
384 udev_list_node_append(&worker
->node
, &worker_list
);
386 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event
->dev
), pid
);
391 static void event_run(struct event
*event
)
393 struct udev_list_node
*loop
;
395 udev_list_node_foreach(loop
, &worker_list
) {
396 struct worker
*worker
= node_to_worker(loop
);
399 if (worker
->state
!= WORKER_IDLE
)
402 count
= udev_monitor_send_device(monitor
, worker
->monitor
, event
->dev
);
404 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker
->pid
, count
);
405 kill(worker
->pid
, SIGKILL
);
406 worker
->state
= WORKER_KILLED
;
410 worker
->event
= event
;
411 worker
->state
= WORKER_RUNNING
;
412 worker
->event_start_usec
= now(CLOCK_MONOTONIC
);
413 event
->state
= EVENT_RUNNING
;
417 if (children
>= children_max
) {
418 if (children_max
> 1)
419 log_debug("maximum number (%i) of children reached\n", children
);
423 /* start new worker and pass initial device */
427 static int event_queue_insert(struct udev_device
*dev
)
431 event
= calloc(1, sizeof(struct event
));
435 event
->udev
= udev_device_get_udev(dev
);
437 event
->seqnum
= udev_device_get_seqnum(dev
);
438 event
->devpath
= udev_device_get_devpath(dev
);
439 event
->devpath_len
= strlen(event
->devpath
);
440 event
->devpath_old
= udev_device_get_devpath_old(dev
);
441 event
->devnum
= udev_device_get_devnum(dev
);
442 event
->is_block
= streq("block", udev_device_get_subsystem(dev
));
443 event
->ifindex
= udev_device_get_ifindex(dev
);
444 if (streq(udev_device_get_subsystem(dev
), "firmware"))
445 event
->nodelay
= true;
447 udev_queue_export_device_queued(udev_queue_export
, dev
);
448 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev
),
449 udev_device_get_action(dev
), udev_device_get_subsystem(dev
));
451 event
->state
= EVENT_QUEUED
;
452 udev_list_node_append(&event
->node
, &event_list
);
456 static void worker_kill(struct udev
*udev
)
458 struct udev_list_node
*loop
;
460 udev_list_node_foreach(loop
, &worker_list
) {
461 struct worker
*worker
= node_to_worker(loop
);
463 if (worker
->state
== WORKER_KILLED
)
466 worker
->state
= WORKER_KILLED
;
467 kill(worker
->pid
, SIGTERM
);
471 /* lookup event for identical, parent, child device */
472 static bool is_devpath_busy(struct event
*event
)
474 struct udev_list_node
*loop
;
477 /* check if queue contains events we depend on */
478 udev_list_node_foreach(loop
, &event_list
) {
479 struct event
*loop_event
= node_to_event(loop
);
481 /* we already found a later event, earlier can not block us, no need to check again */
482 if (loop_event
->seqnum
< event
->delaying_seqnum
)
485 /* event we checked earlier still exists, no need to check again */
486 if (loop_event
->seqnum
== event
->delaying_seqnum
)
489 /* found ourself, no later event can block us */
490 if (loop_event
->seqnum
>= event
->seqnum
)
493 /* check major/minor */
494 if (major(event
->devnum
) != 0 && event
->devnum
== loop_event
->devnum
&& event
->is_block
== loop_event
->is_block
)
497 /* check network device ifindex */
498 if (event
->ifindex
!= 0 && event
->ifindex
== loop_event
->ifindex
)
501 /* check our old name */
502 if (event
->devpath_old
!= NULL
&& streq(loop_event
->devpath
, event
->devpath_old
)) {
503 event
->delaying_seqnum
= loop_event
->seqnum
;
507 /* compare devpath */
508 common
= MIN(loop_event
->devpath_len
, event
->devpath_len
);
510 /* one devpath is contained in the other? */
511 if (memcmp(loop_event
->devpath
, event
->devpath
, common
) != 0)
514 /* identical device event found */
515 if (loop_event
->devpath_len
== event
->devpath_len
) {
516 /* devices names might have changed/swapped in the meantime */
517 if (major(event
->devnum
) != 0 && (event
->devnum
!= loop_event
->devnum
|| event
->is_block
!= loop_event
->is_block
))
519 if (event
->ifindex
!= 0 && event
->ifindex
!= loop_event
->ifindex
)
521 event
->delaying_seqnum
= loop_event
->seqnum
;
525 /* allow to bypass the dependency tracking */
529 /* parent device event found */
530 if (event
->devpath
[common
] == '/') {
531 event
->delaying_seqnum
= loop_event
->seqnum
;
535 /* child device event found */
536 if (loop_event
->devpath
[common
] == '/') {
537 event
->delaying_seqnum
= loop_event
->seqnum
;
541 /* no matching device */
548 static void event_queue_start(struct udev
*udev
)
550 struct udev_list_node
*loop
;
552 udev_list_node_foreach(loop
, &event_list
) {
553 struct event
*event
= node_to_event(loop
);
555 if (event
->state
!= EVENT_QUEUED
)
558 /* do not start event if parent or child event is still running */
559 if (is_devpath_busy(event
))
566 static void event_queue_cleanup(struct udev
*udev
, enum event_state match_type
)
568 struct udev_list_node
*loop
, *tmp
;
570 udev_list_node_foreach_safe(loop
, tmp
, &event_list
) {
571 struct event
*event
= node_to_event(loop
);
573 if (match_type
!= EVENT_UNDEF
&& match_type
!= event
->state
)
576 event_queue_delete(event
, false);
580 static void worker_returned(int fd_worker
)
583 struct worker_message msg
;
585 struct udev_list_node
*loop
;
587 size
= recv(fd_worker
, &msg
, sizeof(struct worker_message
), MSG_DONTWAIT
);
588 if (size
!= sizeof(struct worker_message
))
591 /* lookup worker who sent the signal */
592 udev_list_node_foreach(loop
, &worker_list
) {
593 struct worker
*worker
= node_to_worker(loop
);
595 if (worker
->pid
!= msg
.pid
)
598 /* worker returned */
600 worker
->event
->exitcode
= msg
.exitcode
;
601 event_queue_delete(worker
->event
, true);
602 worker
->event
= NULL
;
604 if (worker
->state
!= WORKER_KILLED
)
605 worker
->state
= WORKER_IDLE
;
606 worker_unref(worker
);
612 /* receive the udevd message from userspace */
613 static struct udev_ctrl_connection
*handle_ctrl_msg(struct udev_ctrl
*uctrl
)
615 struct udev
*udev
= udev_ctrl_get_udev(uctrl
);
616 struct udev_ctrl_connection
*ctrl_conn
;
617 struct udev_ctrl_msg
*ctrl_msg
= NULL
;
621 ctrl_conn
= udev_ctrl_get_connection(uctrl
);
622 if (ctrl_conn
== NULL
)
625 ctrl_msg
= udev_ctrl_receive_msg(ctrl_conn
);
626 if (ctrl_msg
== NULL
)
629 i
= udev_ctrl_get_set_log_level(ctrl_msg
);
631 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i
);
632 log_set_max_level(i
);
633 udev_set_log_priority(udev
, i
);
637 if (udev_ctrl_get_stop_exec_queue(ctrl_msg
) > 0) {
638 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
639 stop_exec_queue
= true;
642 if (udev_ctrl_get_start_exec_queue(ctrl_msg
) > 0) {
643 log_debug("udevd message (START_EXEC_QUEUE) received\n");
644 stop_exec_queue
= false;
647 if (udev_ctrl_get_reload(ctrl_msg
) > 0) {
648 log_debug("udevd message (RELOAD) received\n");
652 str
= udev_ctrl_get_set_env(ctrl_msg
);
660 val
= strchr(key
, '=');
664 if (val
[0] == '\0') {
665 log_debug("udevd message (ENV) received, unset '%s'\n", key
);
666 udev_add_property(udev
, key
, NULL
);
668 log_debug("udevd message (ENV) received, set '%s=%s'\n", key
, val
);
669 udev_add_property(udev
, key
, val
);
672 log_error("wrong key format '%s'\n", key
);
679 i
= udev_ctrl_get_set_children_max(ctrl_msg
);
681 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i
);
685 if (udev_ctrl_get_ping(ctrl_msg
) > 0)
686 log_debug("udevd message (SYNC) received\n");
688 if (udev_ctrl_get_exit(ctrl_msg
) > 0) {
689 log_debug("udevd message (EXIT) received\n");
691 /* keep reference to block the client until we exit */
692 udev_ctrl_connection_ref(ctrl_conn
);
695 udev_ctrl_msg_unref(ctrl_msg
);
696 return udev_ctrl_connection_unref(ctrl_conn
);
699 /* read inotify messages */
700 static int handle_inotify(struct udev
*udev
)
704 struct inotify_event
*ev
;
706 if ((ioctl(fd_inotify
, FIONREAD
, &nbytes
) < 0) || (nbytes
<= 0))
709 buf
= malloc(nbytes
);
711 log_error("error getting buffer for inotify\n");
715 nbytes
= read(fd_inotify
, buf
, nbytes
);
717 for (pos
= 0; pos
< nbytes
; pos
+= sizeof(struct inotify_event
) + ev
->len
) {
718 struct udev_device
*dev
;
720 ev
= (struct inotify_event
*)(buf
+ pos
);
721 dev
= udev_watch_lookup(udev
, ev
->wd
);
723 log_debug("inotify event: %x for %s\n", ev
->mask
, udev_device_get_devnode(dev
));
724 if (ev
->mask
& IN_CLOSE_WRITE
) {
725 char filename
[UTIL_PATH_SIZE
];
728 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev
));
729 strscpyl(filename
, sizeof(filename
), udev_device_get_syspath(dev
), "/uevent", NULL
);
730 fd
= open(filename
, O_WRONLY
);
732 if (write(fd
, "change", 6) < 0)
733 log_debug("error writing uevent: %m\n");
737 if (ev
->mask
& IN_IGNORED
)
738 udev_watch_end(udev
, dev
);
740 udev_device_unref(dev
);
749 static void handle_signal(struct udev
*udev
, int signo
)
760 struct udev_list_node
*loop
, *tmp
;
762 pid
= waitpid(-1, &status
, WNOHANG
);
766 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
767 struct worker
*worker
= node_to_worker(loop
);
769 if (worker
->pid
!= pid
)
771 log_debug("worker [%u] exit\n", pid
);
773 if (WIFEXITED(status
)) {
774 if (WEXITSTATUS(status
) != 0)
775 log_error("worker [%u] exit with return code %i\n", pid
, WEXITSTATUS(status
));
776 } else if (WIFSIGNALED(status
)) {
777 log_error("worker [%u] terminated by signal %i (%s)\n",
778 pid
, WTERMSIG(status
), strsignal(WTERMSIG(status
)));
779 } else if (WIFSTOPPED(status
)) {
780 log_error("worker [%u] stopped\n", pid
);
781 } else if (WIFCONTINUED(status
)) {
782 log_error("worker [%u] continued\n", pid
);
784 log_error("worker [%u] exit with status 0x%04x\n", pid
, status
);
787 if (!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
789 log_error("worker [%u] failed while handling '%s'\n",
790 pid
, worker
->event
->devpath
);
791 worker
->event
->exitcode
= -32;
792 event_queue_delete(worker
->event
, true);
793 /* drop reference taken for state 'running' */
794 worker_unref(worker
);
797 worker_unref(worker
);
808 static void static_dev_create_from_modules(struct udev
*udev
)
810 struct utsname kernel
;
811 char modules
[UTIL_PATH_SIZE
];
816 strscpyl(modules
, sizeof(modules
), ROOTPREFIX
"/lib/modules/", kernel
.release
, "/modules.devname", NULL
);
817 f
= fopen(modules
, "re");
821 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
829 char filename
[UTIL_PATH_SIZE
];
835 s
= strchr(modname
, ' ');
841 s
= strchr(devname
, ' ');
847 s
= strchr(devno
, ' ');
849 s
= strchr(devno
, '\n');
852 if (sscanf(devno
, "%c%u:%u", &type
, &maj
, &min
) != 3)
858 else if (type
== 'b')
863 strscpyl(filename
, sizeof(filename
), "/dev/", devname
, NULL
);
864 mkdir_parents_label(filename
, 0755);
865 label_context_set(filename
, mode
);
866 log_debug("mknod '%s' %c%u:%u\n", filename
, type
, maj
, min
);
867 if (mknod(filename
, mode
, makedev(maj
, min
)) < 0 && errno
== EEXIST
)
868 utimensat(AT_FDCWD
, filename
, NULL
, 0);
869 label_context_clear();
875 static int mem_size_mb(void)
879 long int memsize
= -1;
881 f
= fopen("/proc/meminfo", "re");
885 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
888 if (sscanf(buf
, "MemTotal: %ld kB", &value
) == 1) {
889 memsize
= value
/ 1024;
898 static int convert_db(struct udev
*udev
)
900 char filename
[UTIL_PATH_SIZE
];
901 struct udev_enumerate
*udev_enumerate
;
902 struct udev_list_entry
*list_entry
;
904 /* current database */
905 if (access("/run/udev/data", F_OK
) >= 0)
908 /* make sure we do not get here again */
909 mkdir_p("/run/udev/data", 0755);
912 strscpyl(filename
, sizeof(filename
), "/dev/.udev/db", NULL
);
913 if (access(filename
, F_OK
) < 0)
916 print_kmsg("converting old udev database\n");
918 udev_enumerate
= udev_enumerate_new(udev
);
919 if (udev_enumerate
== NULL
)
921 udev_enumerate_scan_devices(udev_enumerate
);
922 udev_list_entry_foreach(list_entry
, udev_enumerate_get_list_entry(udev_enumerate
)) {
923 struct udev_device
*device
;
925 device
= udev_device_new_from_syspath(udev
, udev_list_entry_get_name(list_entry
));
929 /* try to find the old database for devices without a current one */
930 if (udev_device_read_db(device
, NULL
) < 0) {
934 char devpath
[UTIL_PATH_SIZE
];
935 char from
[UTIL_PATH_SIZE
];
939 /* find database in old location */
940 id
= udev_device_get_id_filename(device
);
941 strscpyl(from
, sizeof(from
), "/dev/.udev/db/", id
, NULL
);
942 if (lstat(from
, &stats
) == 0) {
944 udev_device_read_db(device
, from
);
950 /* find old database with $subsys:$sysname name */
951 strscpyl(from
, sizeof(from
), "/dev/.udev/db/",
952 udev_device_get_subsystem(device
), ":", udev_device_get_sysname(device
), NULL
);
953 if (lstat(from
, &stats
) == 0) {
955 udev_device_read_db(device
, from
);
961 /* find old database with the encoded devpath name */
962 util_path_encode(udev_device_get_devpath(device
), devpath
, sizeof(devpath
));
963 strscpyl(from
, sizeof(from
), "/dev/.udev/db/", devpath
, NULL
);
964 if (lstat(from
, &stats
) == 0) {
966 udev_device_read_db(device
, from
);
972 /* write out new database */
974 udev_device_update_db(device
);
976 udev_device_unref(device
);
978 udev_enumerate_unref(udev_enumerate
);
982 static int systemd_fds(struct udev
*udev
, int *rctrl
, int *rnetlink
)
984 int ctrl
= -1, netlink
= -1;
987 n
= sd_listen_fds(true);
991 for (fd
= SD_LISTEN_FDS_START
; fd
< n
+ SD_LISTEN_FDS_START
; fd
++) {
992 if (sd_is_socket(fd
, AF_LOCAL
, SOCK_SEQPACKET
, -1)) {
999 if (sd_is_socket(fd
, AF_NETLINK
, SOCK_RAW
, -1)) {
1009 if (ctrl
< 0 || netlink
< 0)
1012 log_debug("ctrl=%i netlink=%i\n", ctrl
, netlink
);
1014 *rnetlink
= netlink
;
1019 * read the kernel commandline, in case we need to get into debug mode
1020 * udev.log-priority=<level> syslog priority
1021 * udev.children-max=<number of workers> events are fully serialized if set to 1
1022 * udev.exec-delay=<number of seconds> delay execution of every executed program
1024 static void kernel_cmdline_options(struct udev
*udev
)
1026 char *line
, *w
, *state
;
1029 if (read_one_line_file("/proc/cmdline", &line
) < 0)
1032 FOREACH_WORD_QUOTED(w
, l
, line
, state
) {
1039 /* accept the same options for the initrd, prefixed with "rd." */
1040 if (in_initrd() && startswith(s
, "rd."))
1045 if (startswith(opt
, "udev.log-priority=")) {
1048 prio
= util_log_priority(opt
+ 18);
1049 log_set_max_level(prio
);
1050 udev_set_log_priority(udev
, prio
);
1051 } else if (startswith(opt
, "udev.children-max=")) {
1052 children_max
= strtoul(opt
+ 18, NULL
, 0);
1053 } else if (startswith(opt
, "udev.exec-delay=")) {
1054 exec_delay
= strtoul(opt
+ 16, NULL
, 0);
1063 int main(int argc
, char *argv
[])
1067 int daemonize
= false;
1068 int resolve_names
= 1;
1069 static const struct option options
[] = {
1070 { "daemon", no_argument
, NULL
, 'd' },
1071 { "debug", no_argument
, NULL
, 'D' },
1072 { "children-max", required_argument
, NULL
, 'c' },
1073 { "exec-delay", required_argument
, NULL
, 'e' },
1074 { "resolve-names", required_argument
, NULL
, 'N' },
1075 { "help", no_argument
, NULL
, 'h' },
1076 { "version", no_argument
, NULL
, 'V' },
1080 int fd_netlink
= -1;
1082 struct epoll_event ep_ctrl
, ep_inotify
, ep_signal
, ep_netlink
, ep_worker
;
1083 struct udev_ctrl_connection
*ctrl_conn
= NULL
;
1090 log_set_target(LOG_TARGET_AUTO
);
1091 log_parse_environment();
1093 udev_set_log_fn(udev
, udev_main_log
);
1094 log_debug("version %s\n", VERSION
);
1100 option
= getopt_long(argc
, argv
, "c:de:DtN:hV", options
, NULL
);
1109 children_max
= strtoul(optarg
, NULL
, 0);
1112 exec_delay
= strtoul(optarg
, NULL
, 0);
1116 log_set_max_level(LOG_DEBUG
);
1117 udev_set_log_priority(udev
, LOG_DEBUG
);
1120 if (streq(optarg
, "early")) {
1122 } else if (streq(optarg
, "late")) {
1124 } else if (streq(optarg
, "never")) {
1127 fprintf(stderr
, "resolve-names must be early, late or never\n");
1128 log_error("resolve-names must be early, late or never\n");
1133 printf("Usage: udevd OPTIONS\n"
1136 " --children-max=<maximum number of workers>\n"
1137 " --exec-delay=<seconds to wait before executing RUN=>\n"
1138 " --resolve-names=early|late|never\n"
1144 printf("%s\n", VERSION
);
1151 kernel_cmdline_options(udev
);
1153 if (getuid() != 0) {
1154 fprintf(stderr
, "root privileges required\n");
1155 log_error("root privileges required\n");
1159 /* set umask before creating any file/directory */
1163 mkdir("/run/udev", 0755);
1166 static_dev_create_from_modules(udev
);
1168 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1172 fd
= open("/dev/null", O_RDWR
);
1174 if (write(STDOUT_FILENO
, 0, 0) < 0)
1175 dup2(fd
, STDOUT_FILENO
);
1176 if (write(STDERR_FILENO
, 0, 0) < 0)
1177 dup2(fd
, STDERR_FILENO
);
1178 if (fd
> STDERR_FILENO
)
1181 fprintf(stderr
, "cannot open /dev/null\n");
1182 log_error("cannot open /dev/null\n");
1186 if (systemd_fds(udev
, &fd_ctrl
, &fd_netlink
) >= 0) {
1187 /* get control and netlink socket from systemd */
1188 udev_ctrl
= udev_ctrl_new_from_fd(udev
, fd_ctrl
);
1189 if (udev_ctrl
== NULL
) {
1190 log_error("error taking over udev control socket");
1195 monitor
= udev_monitor_new_from_netlink_fd(udev
, "kernel", fd_netlink
);
1196 if (monitor
== NULL
) {
1197 log_error("error taking over netlink socket\n");
1202 /* get our own cgroup, we regularly kill everything udev has left behind */
1203 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER
, 0, &udev_cgroup
) < 0)
1206 /* open control and netlink socket */
1207 udev_ctrl
= udev_ctrl_new(udev
);
1208 if (udev_ctrl
== NULL
) {
1209 fprintf(stderr
, "error initializing udev control socket");
1210 log_error("error initializing udev control socket");
1214 fd_ctrl
= udev_ctrl_get_fd(udev_ctrl
);
1216 monitor
= udev_monitor_new_from_netlink(udev
, "kernel");
1217 if (monitor
== NULL
) {
1218 fprintf(stderr
, "error initializing netlink socket\n");
1219 log_error("error initializing netlink socket\n");
1223 fd_netlink
= udev_monitor_get_fd(monitor
);
1226 if (udev_monitor_enable_receiving(monitor
) < 0) {
1227 fprintf(stderr
, "error binding netlink socket\n");
1228 log_error("error binding netlink socket\n");
1233 if (udev_ctrl_enable_receiving(udev_ctrl
) < 0) {
1234 fprintf(stderr
, "error binding udev control socket\n");
1235 log_error("error binding udev control socket\n");
1240 udev_monitor_set_receive_buffer_size(monitor
, 128*1024*1024);
1242 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1243 udev_queue_export
= udev_queue_export_new(udev
);
1244 if (udev_queue_export
== NULL
) {
1245 log_error("error creating queue file\n");
1257 log_error("fork of daemon failed: %m\n");
1262 goto exit_daemonize
;
1267 write_one_line_file("/proc/self/oom_score_adj", "-1000");
1269 sd_notify(1, "READY=1");
1272 print_kmsg("starting version " VERSION
"\n");
1277 fd
= open("/dev/null", O_RDWR
);
1279 dup2(fd
, STDIN_FILENO
);
1280 dup2(fd
, STDOUT_FILENO
);
1281 dup2(fd
, STDERR_FILENO
);
1286 fd_inotify
= udev_watch_init(udev
);
1287 if (fd_inotify
< 0) {
1288 fprintf(stderr
, "error initializing inotify\n");
1289 log_error("error initializing inotify\n");
1293 udev_watch_restore(udev
);
1295 /* block and listen to all signals on signalfd */
1297 sigprocmask(SIG_SETMASK
, &mask
, &sigmask_orig
);
1298 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
1299 if (fd_signal
< 0) {
1300 fprintf(stderr
, "error creating signalfd\n");
1301 log_error("error creating signalfd\n");
1306 /* unnamed socket from workers to the main daemon */
1307 if (socketpair(AF_LOCAL
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, worker_watch
) < 0) {
1308 fprintf(stderr
, "error creating socketpair\n");
1309 log_error("error creating socketpair\n");
1313 fd_worker
= worker_watch
[READ_END
];
1315 udev_builtin_init(udev
);
1317 rules
= udev_rules_new(udev
, resolve_names
);
1318 if (rules
== NULL
) {
1319 log_error("error reading rules\n");
1323 memset(&ep_ctrl
, 0, sizeof(struct epoll_event
));
1324 ep_ctrl
.events
= EPOLLIN
;
1325 ep_ctrl
.data
.fd
= fd_ctrl
;
1327 memset(&ep_inotify
, 0, sizeof(struct epoll_event
));
1328 ep_inotify
.events
= EPOLLIN
;
1329 ep_inotify
.data
.fd
= fd_inotify
;
1331 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
1332 ep_signal
.events
= EPOLLIN
;
1333 ep_signal
.data
.fd
= fd_signal
;
1335 memset(&ep_netlink
, 0, sizeof(struct epoll_event
));
1336 ep_netlink
.events
= EPOLLIN
;
1337 ep_netlink
.data
.fd
= fd_netlink
;
1339 memset(&ep_worker
, 0, sizeof(struct epoll_event
));
1340 ep_worker
.events
= EPOLLIN
;
1341 ep_worker
.data
.fd
= fd_worker
;
1343 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
1345 log_error("error creating epoll fd: %m\n");
1348 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_ctrl
, &ep_ctrl
) < 0 ||
1349 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_inotify
, &ep_inotify
) < 0 ||
1350 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
1351 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_netlink
, &ep_netlink
) < 0 ||
1352 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_worker
, &ep_worker
) < 0) {
1353 log_error("fail to add fds to epoll: %m\n");
1357 /* if needed, convert old database from earlier udev version */
1360 if (children_max
<= 0) {
1361 int memsize
= mem_size_mb();
1363 /* set value depending on the amount of RAM */
1365 children_max
= 16 + (memsize
/ 8);
1369 log_debug("set children_max to %u\n", children_max
);
1371 udev_rules_apply_static_dev_perms(rules
);
1373 udev_list_node_init(&event_list
);
1374 udev_list_node_init(&worker_list
);
1377 static usec_t last_usec
;
1378 struct epoll_event ev
[8];
1381 bool is_worker
, is_signal
, is_inotify
, is_netlink
, is_ctrl
;
1385 /* close sources of new events and discard buffered events */
1387 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_ctrl
, NULL
);
1390 if (monitor
!= NULL
) {
1391 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_netlink
, NULL
);
1392 udev_monitor_unref(monitor
);
1395 if (fd_inotify
>= 0) {
1396 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_inotify
, NULL
);
1401 /* discard queued events and kill workers */
1402 event_queue_cleanup(udev
, EVENT_QUEUED
);
1405 /* exit after all has cleaned up */
1406 if (udev_list_node_is_empty(&event_list
) && udev_list_node_is_empty(&worker_list
))
1409 /* timeout at exit for workers to finish */
1410 timeout
= 30 * 1000;
1411 } else if (udev_list_node_is_empty(&event_list
) && !children
) {
1415 /* cleanup possible left-over processes in our cgroup */
1417 cg_kill(SYSTEMD_CGROUP_CONTROLLER
, udev_cgroup
, SIGKILL
, false, true, NULL
);
1419 /* kill idle or hanging workers */
1422 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), timeout
);
1427 struct udev_list_node
*loop
;
1431 log_error("timeout, giving up waiting for workers to finish\n");
1435 /* kill idle workers */
1436 if (udev_list_node_is_empty(&event_list
)) {
1437 log_debug("cleanup idle workers\n");
1441 /* check for hanging events */
1442 udev_list_node_foreach(loop
, &worker_list
) {
1443 struct worker
*worker
= node_to_worker(loop
);
1445 if (worker
->state
!= WORKER_RUNNING
)
1448 if ((now(CLOCK_MONOTONIC
) - worker
->event_start_usec
) > 30 * 1000 * 1000) {
1449 log_error("worker [%u] %s timeout; kill it\n", worker
->pid
,
1450 worker
->event
? worker
->event
->devpath
: "<idle>");
1451 kill(worker
->pid
, SIGKILL
);
1452 worker
->state
= WORKER_KILLED
;
1453 /* drop reference taken for state 'running' */
1454 worker_unref(worker
);
1455 if (worker
->event
) {
1456 log_error("seq %llu '%s' killed\n",
1457 udev_device_get_seqnum(worker
->event
->dev
), worker
->event
->devpath
);
1458 worker
->event
->exitcode
= -64;
1459 event_queue_delete(worker
->event
, true);
1460 worker
->event
= NULL
;
1467 is_worker
= is_signal
= is_inotify
= is_netlink
= is_ctrl
= false;
1468 for (i
= 0; i
< fdcount
; i
++) {
1469 if (ev
[i
].data
.fd
== fd_worker
&& ev
[i
].events
& EPOLLIN
)
1471 else if (ev
[i
].data
.fd
== fd_netlink
&& ev
[i
].events
& EPOLLIN
)
1473 else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
)
1475 else if (ev
[i
].data
.fd
== fd_inotify
&& ev
[i
].events
& EPOLLIN
)
1477 else if (ev
[i
].data
.fd
== fd_ctrl
&& ev
[i
].events
& EPOLLIN
)
1481 /* check for changed config, every 3 seconds at most */
1482 if ((now(CLOCK_MONOTONIC
) - last_usec
) > 3 * 1000 * 1000) {
1483 if (udev_rules_check_timestamp(rules
))
1485 if (udev_builtin_validate(udev
))
1488 last_usec
= now(CLOCK_MONOTONIC
);
1491 /* reload requested, HUP signal received, rules changed, builtin changed */
1494 rules
= udev_rules_unref(rules
);
1495 udev_builtin_exit(udev
);
1499 /* event has finished */
1501 worker_returned(fd_worker
);
1504 struct udev_device
*dev
;
1506 dev
= udev_monitor_receive_device(monitor
);
1508 udev_device_set_usec_initialized(dev
, now(CLOCK_MONOTONIC
));
1509 if (event_queue_insert(dev
) < 0)
1510 udev_device_unref(dev
);
1514 /* start new events */
1515 if (!udev_list_node_is_empty(&event_list
) && !udev_exit
&& !stop_exec_queue
) {
1516 udev_builtin_init(udev
);
1518 rules
= udev_rules_new(udev
, resolve_names
);
1520 event_queue_start(udev
);
1524 struct signalfd_siginfo fdsi
;
1527 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
1528 if (size
== sizeof(struct signalfd_siginfo
))
1529 handle_signal(udev
, fdsi
.ssi_signo
);
1532 /* we are shutting down, the events below are not handled anymore */
1536 /* device node watch */
1538 handle_inotify(udev
);
1541 * This needs to be after the inotify handling, to make sure,
1542 * that the ping is send back after the possibly generated
1543 * "change" events by the inotify device node watch.
1545 * A single time we may receive a client connection which we need to
1546 * keep open to block the client. It will be closed right before we
1550 ctrl_conn
= handle_ctrl_msg(udev_ctrl
);
1555 udev_queue_export_cleanup(udev_queue_export
);
1556 udev_ctrl_cleanup(udev_ctrl
);
1560 worker_list_cleanup(udev
);
1561 event_queue_cleanup(udev
, EVENT_UNDEF
);
1562 udev_rules_unref(rules
);
1563 udev_builtin_exit(udev
);
1566 if (worker_watch
[READ_END
] >= 0)
1567 close(worker_watch
[READ_END
]);
1568 if (worker_watch
[WRITE_END
] >= 0)
1569 close(worker_watch
[WRITE_END
]);
1570 udev_monitor_unref(monitor
);
1571 udev_queue_export_unref(udev_queue_export
);
1572 udev_ctrl_connection_unref(ctrl_conn
);
1573 udev_ctrl_unref(udev_ctrl
);