2 * Copyright (C) 2004-2012 Kay Sievers <kay.sievers@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
;
102 static inline struct event
*node_to_event(struct udev_list_node
*node
)
104 return container_of(node
, struct event
, node
);
107 static void event_queue_cleanup(struct udev
*udev
, enum event_state type
);
117 struct udev_list_node node
;
121 struct udev_monitor
*monitor
;
122 enum worker_state state
;
124 unsigned long long event_start_usec
;
127 /* passed from worker to main process */
128 struct worker_message
{
133 static inline struct worker
*node_to_worker(struct udev_list_node
*node
)
135 return container_of(node
, struct worker
, node
);
138 static void event_queue_delete(struct event
*event
, bool export
)
140 udev_list_node_remove(&event
->node
);
143 udev_queue_export_device_finished(udev_queue_export
, event
->dev
);
144 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event
->dev
), event
->exitcode
);
146 udev_device_unref(event
->dev
);
150 static struct worker
*worker_ref(struct worker
*worker
)
156 static void worker_cleanup(struct worker
*worker
)
158 udev_list_node_remove(&worker
->node
);
159 udev_monitor_unref(worker
->monitor
);
164 static void worker_unref(struct worker
*worker
)
167 if (worker
->refcount
> 0)
169 log_debug("worker [%u] cleaned up\n", worker
->pid
);
170 worker_cleanup(worker
);
173 static void worker_list_cleanup(struct udev
*udev
)
175 struct udev_list_node
*loop
, *tmp
;
177 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
178 struct worker
*worker
= node_to_worker(loop
);
180 worker_cleanup(worker
);
184 static void worker_new(struct event
*event
)
186 struct udev
*udev
= event
->udev
;
187 struct worker
*worker
;
188 struct udev_monitor
*worker_monitor
;
191 /* listen for new events */
192 worker_monitor
= udev_monitor_new_from_netlink(udev
, NULL
);
193 if (worker_monitor
== NULL
)
195 /* allow the main daemon netlink address to send devices to the worker */
196 udev_monitor_allow_unicast_sender(worker_monitor
, monitor
);
197 udev_monitor_enable_receiving(worker_monitor
);
199 worker
= calloc(1, sizeof(struct worker
));
200 if (worker
== NULL
) {
201 udev_monitor_unref(worker_monitor
);
204 /* worker + event reference */
205 worker
->refcount
= 2;
211 struct udev_device
*dev
= NULL
;
213 struct epoll_event ep_signal
, ep_monitor
;
215 int rc
= EXIT_SUCCESS
;
217 /* take initial device from queue */
222 worker_list_cleanup(udev
);
223 event_queue_cleanup(udev
, EVENT_UNDEF
);
224 udev_queue_export_unref(udev_queue_export
);
225 udev_monitor_unref(monitor
);
226 udev_ctrl_unref(udev_ctrl
);
229 close(worker_watch
[READ_END
]);
232 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
234 log_error("error creating signalfd %m\n");
239 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
241 log_error("error creating epoll fd: %m\n");
246 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
247 ep_signal
.events
= EPOLLIN
;
248 ep_signal
.data
.fd
= fd_signal
;
250 fd_monitor
= udev_monitor_get_fd(worker_monitor
);
251 memset(&ep_monitor
, 0, sizeof(struct epoll_event
));
252 ep_monitor
.events
= EPOLLIN
;
253 ep_monitor
.data
.fd
= fd_monitor
;
255 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
256 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_monitor
, &ep_monitor
) < 0) {
257 log_error("fail to add fds to epoll: %m\n");
262 /* request TERM signal if parent exits */
263 prctl(PR_SET_PDEATHSIG
, SIGTERM
);
266 struct udev_event
*udev_event
;
267 struct worker_message msg
;
270 log_debug("seq %llu running\n", udev_device_get_seqnum(dev
));
271 udev_event
= udev_event_new(dev
);
272 if (udev_event
== NULL
) {
277 /* needed for SIGCHLD/SIGTERM in spawn() */
278 udev_event
->fd_signal
= fd_signal
;
281 udev_event
->exec_delay
= exec_delay
;
283 /* apply rules, create node, symlinks */
284 err
= udev_event_execute_rules(udev_event
, rules
, &sigmask_orig
);
287 udev_event_execute_run(udev_event
, &sigmask_orig
);
289 /* apply/restore inotify watch */
290 if (err
== 0 && udev_event
->inotify_watch
) {
291 udev_watch_begin(udev
, dev
);
292 udev_device_update_db(dev
);
295 /* send processed event back to libudev listeners */
296 udev_monitor_send_device(worker_monitor
, NULL
, dev
);
298 /* send udevd the result of the event execution */
299 memset(&msg
, 0, sizeof(struct worker_message
));
303 send(worker_watch
[WRITE_END
], &msg
, sizeof(struct worker_message
), 0);
305 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev
), err
);
307 udev_device_unref(dev
);
310 if (udev_event
->sigterm
) {
311 udev_event_unref(udev_event
);
315 udev_event_unref(udev_event
);
317 /* wait for more device messages from main udevd, or term signal */
318 while (dev
== NULL
) {
319 struct epoll_event ev
[4];
323 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), -1);
327 log_error("failed to poll: %m\n");
331 for (i
= 0; i
< fdcount
; i
++) {
332 if (ev
[i
].data
.fd
== fd_monitor
&& ev
[i
].events
& EPOLLIN
) {
333 dev
= udev_monitor_receive_device(worker_monitor
);
335 } else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
) {
336 struct signalfd_siginfo fdsi
;
339 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
340 if (size
!= sizeof(struct signalfd_siginfo
))
342 switch (fdsi
.ssi_signo
) {
351 udev_device_unref(dev
);
357 close(worker_watch
[WRITE_END
]);
358 udev_rules_unref(rules
);
359 udev_builtin_exit(udev
);
360 udev_monitor_unref(worker_monitor
);
366 udev_monitor_unref(worker_monitor
);
367 event
->state
= EVENT_QUEUED
;
369 log_error("fork of child failed: %m\n");
372 /* close monitor, but keep address around */
373 udev_monitor_disconnect(worker_monitor
);
374 worker
->monitor
= worker_monitor
;
376 worker
->state
= WORKER_RUNNING
;
377 worker
->event_start_usec
= now_usec();
378 worker
->event
= event
;
379 event
->state
= EVENT_RUNNING
;
380 udev_list_node_append(&worker
->node
, &worker_list
);
382 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event
->dev
), pid
);
387 static void event_run(struct event
*event
)
389 struct udev_list_node
*loop
;
391 udev_list_node_foreach(loop
, &worker_list
) {
392 struct worker
*worker
= node_to_worker(loop
);
395 if (worker
->state
!= WORKER_IDLE
)
398 count
= udev_monitor_send_device(monitor
, worker
->monitor
, event
->dev
);
400 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker
->pid
, count
);
401 kill(worker
->pid
, SIGKILL
);
402 worker
->state
= WORKER_KILLED
;
406 worker
->event
= event
;
407 worker
->state
= WORKER_RUNNING
;
408 worker
->event_start_usec
= now_usec();
409 event
->state
= EVENT_RUNNING
;
413 if (children
>= children_max
) {
414 if (children_max
> 1)
415 log_debug("maximum number (%i) of children reached\n", children
);
419 /* start new worker and pass initial device */
423 static int event_queue_insert(struct udev_device
*dev
)
427 event
= calloc(1, sizeof(struct event
));
431 event
->udev
= udev_device_get_udev(dev
);
433 event
->seqnum
= udev_device_get_seqnum(dev
);
434 event
->devpath
= udev_device_get_devpath(dev
);
435 event
->devpath_len
= strlen(event
->devpath
);
436 event
->devpath_old
= udev_device_get_devpath_old(dev
);
437 event
->devnum
= udev_device_get_devnum(dev
);
438 event
->is_block
= (strcmp("block", udev_device_get_subsystem(dev
)) == 0);
439 event
->ifindex
= udev_device_get_ifindex(dev
);
441 udev_queue_export_device_queued(udev_queue_export
, dev
);
442 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev
),
443 udev_device_get_action(dev
), udev_device_get_subsystem(dev
));
445 event
->state
= EVENT_QUEUED
;
446 udev_list_node_append(&event
->node
, &event_list
);
450 static void worker_kill(struct udev
*udev
)
452 struct udev_list_node
*loop
;
454 udev_list_node_foreach(loop
, &worker_list
) {
455 struct worker
*worker
= node_to_worker(loop
);
457 if (worker
->state
== WORKER_KILLED
)
460 worker
->state
= WORKER_KILLED
;
461 kill(worker
->pid
, SIGTERM
);
465 /* lookup event for identical, parent, child device */
466 static bool is_devpath_busy(struct event
*event
)
468 struct udev_list_node
*loop
;
471 /* check if queue contains events we depend on */
472 udev_list_node_foreach(loop
, &event_list
) {
473 struct event
*loop_event
= node_to_event(loop
);
475 /* we already found a later event, earlier can not block us, no need to check again */
476 if (loop_event
->seqnum
< event
->delaying_seqnum
)
479 /* event we checked earlier still exists, no need to check again */
480 if (loop_event
->seqnum
== event
->delaying_seqnum
)
483 /* found ourself, no later event can block us */
484 if (loop_event
->seqnum
>= event
->seqnum
)
487 /* check major/minor */
488 if (major(event
->devnum
) != 0 && event
->devnum
== loop_event
->devnum
&& event
->is_block
== loop_event
->is_block
)
491 /* check network device ifindex */
492 if (event
->ifindex
!= 0 && event
->ifindex
== loop_event
->ifindex
)
495 /* check our old name */
496 if (event
->devpath_old
!= NULL
&& strcmp(loop_event
->devpath
, event
->devpath_old
) == 0) {
497 event
->delaying_seqnum
= loop_event
->seqnum
;
501 /* compare devpath */
502 common
= MIN(loop_event
->devpath_len
, event
->devpath_len
);
504 /* one devpath is contained in the other? */
505 if (memcmp(loop_event
->devpath
, event
->devpath
, common
) != 0)
508 /* identical device event found */
509 if (loop_event
->devpath_len
== event
->devpath_len
) {
510 /* devices names might have changed/swapped in the meantime */
511 if (major(event
->devnum
) != 0 && (event
->devnum
!= loop_event
->devnum
|| event
->is_block
!= loop_event
->is_block
))
513 if (event
->ifindex
!= 0 && event
->ifindex
!= loop_event
->ifindex
)
515 event
->delaying_seqnum
= loop_event
->seqnum
;
519 /* parent device event found */
520 if (event
->devpath
[common
] == '/') {
521 event
->delaying_seqnum
= loop_event
->seqnum
;
525 /* child device event found */
526 if (loop_event
->devpath
[common
] == '/') {
527 event
->delaying_seqnum
= loop_event
->seqnum
;
531 /* no matching device */
538 static void event_queue_start(struct udev
*udev
)
540 struct udev_list_node
*loop
;
542 udev_list_node_foreach(loop
, &event_list
) {
543 struct event
*event
= node_to_event(loop
);
545 if (event
->state
!= EVENT_QUEUED
)
548 /* do not start event if parent or child event is still running */
549 if (is_devpath_busy(event
))
556 static void event_queue_cleanup(struct udev
*udev
, enum event_state match_type
)
558 struct udev_list_node
*loop
, *tmp
;
560 udev_list_node_foreach_safe(loop
, tmp
, &event_list
) {
561 struct event
*event
= node_to_event(loop
);
563 if (match_type
!= EVENT_UNDEF
&& match_type
!= event
->state
)
566 event_queue_delete(event
, false);
570 static void worker_returned(int fd_worker
)
573 struct worker_message msg
;
575 struct udev_list_node
*loop
;
577 size
= recv(fd_worker
, &msg
, sizeof(struct worker_message
), MSG_DONTWAIT
);
578 if (size
!= sizeof(struct worker_message
))
581 /* lookup worker who sent the signal */
582 udev_list_node_foreach(loop
, &worker_list
) {
583 struct worker
*worker
= node_to_worker(loop
);
585 if (worker
->pid
!= msg
.pid
)
588 /* worker returned */
590 worker
->event
->exitcode
= msg
.exitcode
;
591 event_queue_delete(worker
->event
, true);
592 worker
->event
= NULL
;
594 if (worker
->state
!= WORKER_KILLED
)
595 worker
->state
= WORKER_IDLE
;
596 worker_unref(worker
);
602 /* receive the udevd message from userspace */
603 static struct udev_ctrl_connection
*handle_ctrl_msg(struct udev_ctrl
*uctrl
)
605 struct udev
*udev
= udev_ctrl_get_udev(uctrl
);
606 struct udev_ctrl_connection
*ctrl_conn
;
607 struct udev_ctrl_msg
*ctrl_msg
= NULL
;
611 ctrl_conn
= udev_ctrl_get_connection(uctrl
);
612 if (ctrl_conn
== NULL
)
615 ctrl_msg
= udev_ctrl_receive_msg(ctrl_conn
);
616 if (ctrl_msg
== NULL
)
619 i
= udev_ctrl_get_set_log_level(ctrl_msg
);
621 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i
);
622 log_set_max_level(i
);
623 udev_set_log_priority(udev
, i
);
627 if (udev_ctrl_get_stop_exec_queue(ctrl_msg
) > 0) {
628 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
629 stop_exec_queue
= true;
632 if (udev_ctrl_get_start_exec_queue(ctrl_msg
) > 0) {
633 log_debug("udevd message (START_EXEC_QUEUE) received\n");
634 stop_exec_queue
= false;
637 if (udev_ctrl_get_reload(ctrl_msg
) > 0) {
638 log_debug("udevd message (RELOAD) received\n");
642 str
= udev_ctrl_get_set_env(ctrl_msg
);
650 val
= strchr(key
, '=');
654 if (val
[0] == '\0') {
655 log_debug("udevd message (ENV) received, unset '%s'\n", key
);
656 udev_add_property(udev
, key
, NULL
);
658 log_debug("udevd message (ENV) received, set '%s=%s'\n", key
, val
);
659 udev_add_property(udev
, key
, val
);
662 log_error("wrong key format '%s'\n", key
);
669 i
= udev_ctrl_get_set_children_max(ctrl_msg
);
671 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i
);
675 if (udev_ctrl_get_ping(ctrl_msg
) > 0)
676 log_debug("udevd message (SYNC) received\n");
678 if (udev_ctrl_get_exit(ctrl_msg
) > 0) {
679 log_debug("udevd message (EXIT) received\n");
681 /* keep reference to block the client until we exit */
682 udev_ctrl_connection_ref(ctrl_conn
);
685 udev_ctrl_msg_unref(ctrl_msg
);
686 return udev_ctrl_connection_unref(ctrl_conn
);
689 /* read inotify messages */
690 static int handle_inotify(struct udev
*udev
)
694 struct inotify_event
*ev
;
696 if ((ioctl(fd_inotify
, FIONREAD
, &nbytes
) < 0) || (nbytes
<= 0))
699 buf
= malloc(nbytes
);
701 log_error("error getting buffer for inotify\n");
705 nbytes
= read(fd_inotify
, buf
, nbytes
);
707 for (pos
= 0; pos
< nbytes
; pos
+= sizeof(struct inotify_event
) + ev
->len
) {
708 struct udev_device
*dev
;
710 ev
= (struct inotify_event
*)(buf
+ pos
);
711 dev
= udev_watch_lookup(udev
, ev
->wd
);
713 log_debug("inotify event: %x for %s\n", ev
->mask
, udev_device_get_devnode(dev
));
714 if (ev
->mask
& IN_CLOSE_WRITE
) {
715 char filename
[UTIL_PATH_SIZE
];
718 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev
));
719 util_strscpyl(filename
, sizeof(filename
), udev_device_get_syspath(dev
), "/uevent", NULL
);
720 fd
= open(filename
, O_WRONLY
);
722 if (write(fd
, "change", 6) < 0)
723 log_debug("error writing uevent: %m\n");
727 if (ev
->mask
& IN_IGNORED
)
728 udev_watch_end(udev
, dev
);
730 udev_device_unref(dev
);
739 static void handle_signal(struct udev
*udev
, int signo
)
750 struct udev_list_node
*loop
, *tmp
;
752 pid
= waitpid(-1, &status
, WNOHANG
);
756 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
757 struct worker
*worker
= node_to_worker(loop
);
759 if (worker
->pid
!= pid
)
761 log_debug("worker [%u] exit\n", pid
);
763 if (WIFEXITED(status
)) {
764 if (WEXITSTATUS(status
) != 0)
765 log_error("worker [%u] exit with return code %i\n", pid
, WEXITSTATUS(status
));
766 } else if (WIFSIGNALED(status
)) {
767 log_error("worker [%u] terminated by signal %i (%s)\n",
768 pid
, WTERMSIG(status
), strsignal(WTERMSIG(status
)));
769 } else if (WIFSTOPPED(status
)) {
770 log_error("worker [%u] stopped\n", pid
);
771 } else if (WIFCONTINUED(status
)) {
772 log_error("worker [%u] continued\n", pid
);
774 log_error("worker [%u] exit with status 0x%04x\n", pid
, status
);
777 if (!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
779 log_error("worker [%u] failed while handling '%s'\n",
780 pid
, worker
->event
->devpath
);
781 worker
->event
->exitcode
= -32;
782 event_queue_delete(worker
->event
, true);
783 /* drop reference taken for state 'running' */
784 worker_unref(worker
);
787 worker_unref(worker
);
798 static void static_dev_create_from_modules(struct udev
*udev
)
800 struct utsname kernel
;
801 char modules
[UTIL_PATH_SIZE
];
806 util_strscpyl(modules
, sizeof(modules
), "/lib/modules/", kernel
.release
, "/modules.devname", NULL
);
807 f
= fopen(modules
, "r");
811 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
819 char filename
[UTIL_PATH_SIZE
];
825 s
= strchr(modname
, ' ');
831 s
= strchr(devname
, ' ');
837 s
= strchr(devno
, ' ');
839 s
= strchr(devno
, '\n');
842 if (sscanf(devno
, "%c%u:%u", &type
, &maj
, &min
) != 3)
847 else if (type
== 'b')
852 util_strscpyl(filename
, sizeof(filename
), "/dev/", devname
, NULL
);
853 mkdir_parents(filename
, 0755);
854 label_context_set(filename
, mode
);
855 log_debug("mknod '%s' %c%u:%u\n", filename
, type
, maj
, min
);
856 if (mknod(filename
, mode
, makedev(maj
, min
)) < 0 && errno
== EEXIST
)
857 utimensat(AT_FDCWD
, filename
, NULL
, 0);
858 label_context_clear();
864 static int mem_size_mb(void)
868 long int memsize
= -1;
870 f
= fopen("/proc/meminfo", "r");
874 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
877 if (sscanf(buf
, "MemTotal: %ld kB", &value
) == 1) {
878 memsize
= value
/ 1024;
887 static int convert_db(struct udev
*udev
)
889 char filename
[UTIL_PATH_SIZE
];
891 struct udev_enumerate
*udev_enumerate
;
892 struct udev_list_entry
*list_entry
;
894 /* current database */
895 if (access("/run/udev/data", F_OK
) >= 0)
898 /* make sure we do not get here again */
899 mkdir_parents("/run/udev/data", 0755);
900 mkdir(filename
, 0755);
903 util_strscpyl(filename
, sizeof(filename
), "/dev/.udev/db", NULL
);
904 if (access(filename
, F_OK
) < 0)
907 f
= fopen("/dev/kmsg", "w");
909 fprintf(f
, "<30>udevd[%u]: converting old udev database\n", getpid());
913 udev_enumerate
= udev_enumerate_new(udev
);
914 if (udev_enumerate
== NULL
)
916 udev_enumerate_scan_devices(udev_enumerate
);
917 udev_list_entry_foreach(list_entry
, udev_enumerate_get_list_entry(udev_enumerate
)) {
918 struct udev_device
*device
;
920 device
= udev_device_new_from_syspath(udev
, udev_list_entry_get_name(list_entry
));
924 /* try to find the old database for devices without a current one */
925 if (udev_device_read_db(device
, NULL
) < 0) {
929 char devpath
[UTIL_PATH_SIZE
];
930 char from
[UTIL_PATH_SIZE
];
934 /* find database in old location */
935 id
= udev_device_get_id_filename(device
);
936 util_strscpyl(from
, sizeof(from
), "/dev/.udev/db/", id
, NULL
);
937 if (lstat(from
, &stats
) == 0) {
939 udev_device_read_db(device
, from
);
945 /* find old database with $subsys:$sysname name */
946 util_strscpyl(from
, sizeof(from
), "/dev/.udev/db/",
947 udev_device_get_subsystem(device
), ":", udev_device_get_sysname(device
), NULL
);
948 if (lstat(from
, &stats
) == 0) {
950 udev_device_read_db(device
, from
);
956 /* find old database with the encoded devpath name */
957 util_path_encode(udev_device_get_devpath(device
), devpath
, sizeof(devpath
));
958 util_strscpyl(from
, sizeof(from
), "/dev/.udev/db/", devpath
, NULL
);
959 if (lstat(from
, &stats
) == 0) {
961 udev_device_read_db(device
, from
);
967 /* write out new database */
969 udev_device_update_db(device
);
971 udev_device_unref(device
);
973 udev_enumerate_unref(udev_enumerate
);
977 static int systemd_fds(struct udev
*udev
, int *rctrl
, int *rnetlink
)
979 int ctrl
= -1, netlink
= -1;
982 n
= sd_listen_fds(true);
986 for (fd
= SD_LISTEN_FDS_START
; fd
< n
+ SD_LISTEN_FDS_START
; fd
++) {
987 if (sd_is_socket(fd
, AF_LOCAL
, SOCK_SEQPACKET
, -1)) {
994 if (sd_is_socket(fd
, AF_NETLINK
, SOCK_RAW
, -1)) {
1004 if (ctrl
< 0 || netlink
< 0)
1007 log_debug("ctrl=%i netlink=%i\n", ctrl
, netlink
);
1009 *rnetlink
= netlink
;
1013 int main(int argc
, char *argv
[])
1018 int daemonize
= false;
1019 int resolve_names
= 1;
1020 static const struct option options
[] = {
1021 { "daemon", no_argument
, NULL
, 'd' },
1022 { "debug", no_argument
, NULL
, 'D' },
1023 { "children-max", required_argument
, NULL
, 'c' },
1024 { "exec-delay", required_argument
, NULL
, 'e' },
1025 { "resolve-names", required_argument
, NULL
, 'N' },
1026 { "help", no_argument
, NULL
, 'h' },
1027 { "version", no_argument
, NULL
, 'V' },
1031 int fd_netlink
= -1;
1033 const char *prefixes
[] = { "/dev", "/run", NULL
};
1034 struct epoll_event ep_ctrl
, ep_inotify
, ep_signal
, ep_netlink
, ep_worker
;
1035 struct udev_ctrl_connection
*ctrl_conn
= NULL
;
1043 log_parse_environment();
1044 udev_set_log_fn(udev
, udev_main_log
);
1045 log_debug("version %s\n", VERSION
);
1046 label_init(prefixes
);
1051 option
= getopt_long(argc
, argv
, "c:deDtN:hV", options
, NULL
);
1060 children_max
= strtoul(optarg
, NULL
, 0);
1063 exec_delay
= strtoul(optarg
, NULL
, 0);
1067 log_set_max_level(LOG_DEBUG
);
1068 udev_set_log_priority(udev
, LOG_INFO
);
1071 if (strcmp (optarg
, "early") == 0) {
1073 } else if (strcmp (optarg
, "late") == 0) {
1075 } else if (strcmp (optarg
, "never") == 0) {
1078 fprintf(stderr
, "resolve-names must be early, late or never\n");
1079 log_error("resolve-names must be early, late or never\n");
1084 printf("Usage: udevd OPTIONS\n"
1087 " --children-max=<maximum number of workers>\n"
1088 " --exec-delay=<seconds to wait before executing RUN=>\n"
1089 " --resolve-names=early|late|never\n"
1095 printf("%s\n", VERSION
);
1103 * read the kernel commandline, in case we need to get into debug mode
1104 * udev.log-priority=<level> syslog priority
1105 * udev.children-max=<number of workers> events are fully serialized if set to 1
1108 f
= fopen("/proc/cmdline", "r");
1112 if (fgets(cmdline
, sizeof(cmdline
), f
) != NULL
) {
1115 pos
= strstr(cmdline
, "udev.log-priority=");
1117 pos
+= strlen("udev.log-priority=");
1118 udev_set_log_priority(udev
, util_log_priority(pos
));
1121 pos
= strstr(cmdline
, "udev.children-max=");
1123 pos
+= strlen("udev.children-max=");
1124 children_max
= strtoul(pos
, NULL
, 0);
1127 pos
= strstr(cmdline
, "udev.exec-delay=");
1129 pos
+= strlen("udev.exec-delay=");
1130 exec_delay
= strtoul(pos
, NULL
, 0);
1136 if (getuid() != 0) {
1137 fprintf(stderr
, "root privileges required\n");
1138 log_error("root privileges required\n");
1142 /* set umask before creating any file/directory */
1146 mkdir("/run/udev", 0755);
1149 static_dev_create_from_modules(udev
);
1151 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1155 fd
= open("/dev/null", O_RDWR
);
1157 if (write(STDOUT_FILENO
, 0, 0) < 0)
1158 dup2(fd
, STDOUT_FILENO
);
1159 if (write(STDERR_FILENO
, 0, 0) < 0)
1160 dup2(fd
, STDERR_FILENO
);
1161 if (fd
> STDERR_FILENO
)
1164 fprintf(stderr
, "cannot open /dev/null\n");
1165 log_error("cannot open /dev/null\n");
1169 if (systemd_fds(udev
, &fd_ctrl
, &fd_netlink
) >= 0) {
1170 /* get control and netlink socket from from systemd */
1171 udev_ctrl
= udev_ctrl_new_from_fd(udev
, fd_ctrl
);
1172 if (udev_ctrl
== NULL
) {
1173 log_error("error taking over udev control socket");
1178 monitor
= udev_monitor_new_from_netlink_fd(udev
, "kernel", fd_netlink
);
1179 if (monitor
== NULL
) {
1180 log_error("error taking over netlink socket\n");
1185 /* get our own cgroup, we regularly kill everything udev has left behind */
1186 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER
, 0, &udev_cgroup
) < 0)
1189 /* open control and netlink socket */
1190 udev_ctrl
= udev_ctrl_new(udev
);
1191 if (udev_ctrl
== NULL
) {
1192 fprintf(stderr
, "error initializing udev control socket");
1193 log_error("error initializing udev control socket");
1197 fd_ctrl
= udev_ctrl_get_fd(udev_ctrl
);
1199 monitor
= udev_monitor_new_from_netlink(udev
, "kernel");
1200 if (monitor
== NULL
) {
1201 fprintf(stderr
, "error initializing netlink socket\n");
1202 log_error("error initializing netlink socket\n");
1206 fd_netlink
= udev_monitor_get_fd(monitor
);
1209 if (udev_monitor_enable_receiving(monitor
) < 0) {
1210 fprintf(stderr
, "error binding netlink socket\n");
1211 log_error("error binding netlink socket\n");
1216 if (udev_ctrl_enable_receiving(udev_ctrl
) < 0) {
1217 fprintf(stderr
, "error binding udev control socket\n");
1218 log_error("error binding udev control socket\n");
1223 udev_monitor_set_receive_buffer_size(monitor
, 128*1024*1024);
1225 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1226 udev_queue_export
= udev_queue_export_new(udev
);
1227 if (udev_queue_export
== NULL
) {
1228 log_error("error creating queue file\n");
1241 log_error("fork of daemon failed: %m\n");
1246 goto exit_daemonize
;
1251 fd
= open("/proc/self/oom_score_adj", O_RDWR
|O_CLOEXEC
);
1253 write(fd
, "-1000", 5);
1257 sd_notify(1, "READY=1");
1260 f
= fopen("/dev/kmsg", "w");
1262 fprintf(f
, "<30>udevd[%u]: starting version " VERSION
"\n", getpid());
1269 fd
= open("/dev/null", O_RDWR
);
1271 dup2(fd
, STDIN_FILENO
);
1272 dup2(fd
, STDOUT_FILENO
);
1273 dup2(fd
, STDERR_FILENO
);
1278 fd_inotify
= udev_watch_init(udev
);
1279 if (fd_inotify
< 0) {
1280 fprintf(stderr
, "error initializing inotify\n");
1281 log_error("error initializing inotify\n");
1285 udev_watch_restore(udev
);
1287 /* block and listen to all signals on signalfd */
1289 sigprocmask(SIG_SETMASK
, &mask
, &sigmask_orig
);
1290 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
1291 if (fd_signal
< 0) {
1292 fprintf(stderr
, "error creating signalfd\n");
1293 log_error("error creating signalfd\n");
1298 /* unnamed socket from workers to the main daemon */
1299 if (socketpair(AF_LOCAL
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, worker_watch
) < 0) {
1300 fprintf(stderr
, "error creating socketpair\n");
1301 log_error("error creating socketpair\n");
1305 fd_worker
= worker_watch
[READ_END
];
1307 udev_builtin_init(udev
);
1309 rules
= udev_rules_new(udev
, resolve_names
);
1310 if (rules
== NULL
) {
1311 log_error("error reading rules\n");
1315 memset(&ep_ctrl
, 0, sizeof(struct epoll_event
));
1316 ep_ctrl
.events
= EPOLLIN
;
1317 ep_ctrl
.data
.fd
= fd_ctrl
;
1319 memset(&ep_inotify
, 0, sizeof(struct epoll_event
));
1320 ep_inotify
.events
= EPOLLIN
;
1321 ep_inotify
.data
.fd
= fd_inotify
;
1323 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
1324 ep_signal
.events
= EPOLLIN
;
1325 ep_signal
.data
.fd
= fd_signal
;
1327 memset(&ep_netlink
, 0, sizeof(struct epoll_event
));
1328 ep_netlink
.events
= EPOLLIN
;
1329 ep_netlink
.data
.fd
= fd_netlink
;
1331 memset(&ep_worker
, 0, sizeof(struct epoll_event
));
1332 ep_worker
.events
= EPOLLIN
;
1333 ep_worker
.data
.fd
= fd_worker
;
1335 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
1337 log_error("error creating epoll fd: %m\n");
1340 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_ctrl
, &ep_ctrl
) < 0 ||
1341 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_inotify
, &ep_inotify
) < 0 ||
1342 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
1343 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_netlink
, &ep_netlink
) < 0 ||
1344 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_worker
, &ep_worker
) < 0) {
1345 log_error("fail to add fds to epoll: %m\n");
1349 /* if needed, convert old database from earlier udev version */
1352 if (children_max
<= 0) {
1353 int memsize
= mem_size_mb();
1355 /* set value depending on the amount of RAM */
1357 children_max
= 128 + (memsize
/ 8);
1361 log_debug("set children_max to %u\n", children_max
);
1363 udev_rules_apply_static_dev_perms(rules
);
1365 udev_list_node_init(&event_list
);
1366 udev_list_node_init(&worker_list
);
1369 static unsigned long long last_usec
;
1370 struct epoll_event ev
[8];
1373 bool is_worker
, is_signal
, is_inotify
, is_netlink
, is_ctrl
;
1377 /* close sources of new events and discard buffered events */
1379 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_ctrl
, NULL
);
1382 if (monitor
!= NULL
) {
1383 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_netlink
, NULL
);
1384 udev_monitor_unref(monitor
);
1387 if (fd_inotify
>= 0) {
1388 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_inotify
, NULL
);
1393 /* discard queued events and kill workers */
1394 event_queue_cleanup(udev
, EVENT_QUEUED
);
1397 /* exit after all has cleaned up */
1398 if (udev_list_node_is_empty(&event_list
) && udev_list_node_is_empty(&worker_list
))
1401 /* timeout at exit for workers to finish */
1402 timeout
= 30 * 1000;
1403 } else if (udev_list_node_is_empty(&event_list
) && !children
) {
1407 /* cleanup possible left-over processes in our cgroup */
1409 cg_kill(SYSTEMD_CGROUP_CONTROLLER
, udev_cgroup
, SIGKILL
, false, true, NULL
);
1411 /* kill idle or hanging workers */
1414 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), timeout
);
1419 struct udev_list_node
*loop
;
1423 log_error("timeout, giving up waiting for workers to finish\n");
1427 /* kill idle workers */
1428 if (udev_list_node_is_empty(&event_list
)) {
1429 log_debug("cleanup idle workers\n");
1433 /* check for hanging events */
1434 udev_list_node_foreach(loop
, &worker_list
) {
1435 struct worker
*worker
= node_to_worker(loop
);
1437 if (worker
->state
!= WORKER_RUNNING
)
1440 if ((now_usec() - worker
->event_start_usec
) > 30 * 1000 * 1000) {
1441 log_error("worker [%u] %s timeout; kill it\n", worker
->pid
,
1442 worker
->event
? worker
->event
->devpath
: "<idle>");
1443 kill(worker
->pid
, SIGKILL
);
1444 worker
->state
= WORKER_KILLED
;
1445 /* drop reference taken for state 'running' */
1446 worker_unref(worker
);
1447 if (worker
->event
) {
1448 log_error("seq %llu '%s' killed\n",
1449 udev_device_get_seqnum(worker
->event
->dev
), worker
->event
->devpath
);
1450 worker
->event
->exitcode
= -64;
1451 event_queue_delete(worker
->event
, true);
1452 worker
->event
= NULL
;
1459 is_worker
= is_signal
= is_inotify
= is_netlink
= is_ctrl
= false;
1460 for (i
= 0; i
< fdcount
; i
++) {
1461 if (ev
[i
].data
.fd
== fd_worker
&& ev
[i
].events
& EPOLLIN
)
1463 else if (ev
[i
].data
.fd
== fd_netlink
&& ev
[i
].events
& EPOLLIN
)
1465 else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
)
1467 else if (ev
[i
].data
.fd
== fd_inotify
&& ev
[i
].events
& EPOLLIN
)
1469 else if (ev
[i
].data
.fd
== fd_ctrl
&& ev
[i
].events
& EPOLLIN
)
1473 /* check for changed config, every 3 seconds at most */
1474 if ((now_usec() - last_usec
) > 3 * 1000 * 1000) {
1475 if (udev_rules_check_timestamp(rules
))
1477 if (udev_builtin_validate(udev
))
1480 last_usec
= now_usec();
1483 /* reload requested, HUP signal received, rules changed, builtin changed */
1486 rules
= udev_rules_unref(rules
);
1487 udev_builtin_exit(udev
);
1491 /* event has finished */
1493 worker_returned(fd_worker
);
1496 struct udev_device
*dev
;
1498 dev
= udev_monitor_receive_device(monitor
);
1500 udev_device_set_usec_initialized(dev
, now_usec());
1501 if (event_queue_insert(dev
) < 0)
1502 udev_device_unref(dev
);
1506 /* start new events */
1507 if (!udev_list_node_is_empty(&event_list
) && !udev_exit
&& !stop_exec_queue
) {
1509 rules
= udev_rules_new(udev
, resolve_names
);
1511 event_queue_start(udev
);
1515 struct signalfd_siginfo fdsi
;
1518 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
1519 if (size
== sizeof(struct signalfd_siginfo
))
1520 handle_signal(udev
, fdsi
.ssi_signo
);
1523 /* we are shutting down, the events below are not handled anymore */
1527 /* device node watch */
1529 handle_inotify(udev
);
1532 * This needs to be after the inotify handling, to make sure,
1533 * that the ping is send back after the possibly generated
1534 * "change" events by the inotify device node watch.
1536 * A single time we may receive a client connection which we need to
1537 * keep open to block the client. It will be closed right before we
1541 ctrl_conn
= handle_ctrl_msg(udev_ctrl
);
1546 udev_queue_export_cleanup(udev_queue_export
);
1547 udev_ctrl_cleanup(udev_ctrl
);
1551 worker_list_cleanup(udev
);
1552 event_queue_cleanup(udev
, EVENT_UNDEF
);
1553 udev_rules_unref(rules
);
1554 udev_builtin_exit(udev
);
1557 if (worker_watch
[READ_END
] >= 0)
1558 close(worker_watch
[READ_END
]);
1559 if (worker_watch
[WRITE_END
] >= 0)
1560 close(worker_watch
[WRITE_END
]);
1561 udev_monitor_unref(monitor
);
1562 udev_queue_export_unref(udev_queue_export
);
1563 udev_ctrl_connection_unref(ctrl_conn
);
1564 udev_ctrl_unref(udev_ctrl
);