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"
55 void udev_main_log(struct udev
*udev
, int priority
,
56 const char *file
, int line
, const char *fn
,
57 const char *format
, va_list args
)
59 log_metav(priority
, file
, line
, fn
, format
, args
);
62 static struct udev_rules
*rules
;
63 static struct udev_queue_export
*udev_queue_export
;
64 static struct udev_ctrl
*udev_ctrl
;
65 static struct udev_monitor
*monitor
;
66 static int worker_watch
[2] = { -1, -1 };
67 static int fd_signal
= -1;
68 static int fd_ep
= -1;
69 static int fd_inotify
= -1;
70 static bool stop_exec_queue
;
73 static int children_max
;
74 static int exec_delay
;
75 static sigset_t sigmask_orig
;
76 static UDEV_LIST(event_list
);
77 static UDEV_LIST(worker_list
);
79 static bool udev_exit
;
88 struct udev_list_node node
;
90 struct udev_device
*dev
;
91 enum event_state state
;
93 unsigned long long int delaying_seqnum
;
94 unsigned long long int seqnum
;
97 const char *devpath_old
;
106 static inline struct event
*node_to_event(struct udev_list_node
*node
)
108 return container_of(node
, struct event
, node
);
111 static void event_queue_cleanup(struct udev
*udev
, enum event_state type
);
121 struct udev_list_node node
;
125 struct udev_monitor
*monitor
;
126 enum worker_state state
;
128 usec_t event_start_usec
;
131 /* passed from worker to main process */
132 struct worker_message
{
137 static inline struct worker
*node_to_worker(struct udev_list_node
*node
)
139 return container_of(node
, struct worker
, node
);
142 static void event_queue_delete(struct event
*event
, bool export
)
144 udev_list_node_remove(&event
->node
);
147 udev_queue_export_device_finished(udev_queue_export
, event
->dev
);
148 log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event
->dev
), event
->exitcode
);
150 udev_device_unref(event
->dev
);
154 static struct worker
*worker_ref(struct worker
*worker
)
160 static void worker_cleanup(struct worker
*worker
)
162 udev_list_node_remove(&worker
->node
);
163 udev_monitor_unref(worker
->monitor
);
168 static void worker_unref(struct worker
*worker
)
171 if (worker
->refcount
> 0)
173 log_debug("worker [%u] cleaned up\n", worker
->pid
);
174 worker_cleanup(worker
);
177 static void worker_list_cleanup(struct udev
*udev
)
179 struct udev_list_node
*loop
, *tmp
;
181 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
182 struct worker
*worker
= node_to_worker(loop
);
184 worker_cleanup(worker
);
188 static void worker_new(struct event
*event
)
190 struct udev
*udev
= event
->udev
;
191 struct worker
*worker
;
192 struct udev_monitor
*worker_monitor
;
195 /* listen for new events */
196 worker_monitor
= udev_monitor_new_from_netlink(udev
, NULL
);
197 if (worker_monitor
== NULL
)
199 /* allow the main daemon netlink address to send devices to the worker */
200 udev_monitor_allow_unicast_sender(worker_monitor
, monitor
);
201 udev_monitor_enable_receiving(worker_monitor
);
203 worker
= calloc(1, sizeof(struct worker
));
204 if (worker
== NULL
) {
205 udev_monitor_unref(worker_monitor
);
208 /* worker + event reference */
209 worker
->refcount
= 2;
215 struct udev_device
*dev
= NULL
;
217 struct epoll_event ep_signal
, ep_monitor
;
219 int rc
= EXIT_SUCCESS
;
221 /* take initial device from queue */
226 worker_list_cleanup(udev
);
227 event_queue_cleanup(udev
, EVENT_UNDEF
);
228 udev_queue_export_unref(udev_queue_export
);
229 udev_monitor_unref(monitor
);
230 udev_ctrl_unref(udev_ctrl
);
233 close(worker_watch
[READ_END
]);
236 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
238 log_error("error creating signalfd %m\n");
243 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
245 log_error("error creating epoll fd: %m\n");
250 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
251 ep_signal
.events
= EPOLLIN
;
252 ep_signal
.data
.fd
= fd_signal
;
254 fd_monitor
= udev_monitor_get_fd(worker_monitor
);
255 memset(&ep_monitor
, 0, sizeof(struct epoll_event
));
256 ep_monitor
.events
= EPOLLIN
;
257 ep_monitor
.data
.fd
= fd_monitor
;
259 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
260 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_monitor
, &ep_monitor
) < 0) {
261 log_error("fail to add fds to epoll: %m\n");
266 /* request TERM signal if parent exits */
267 prctl(PR_SET_PDEATHSIG
, SIGTERM
);
269 /* reset OOM score, we only protect the main daemon */
270 write_string_file("/proc/self/oom_score_adj", "0");
273 struct udev_event
*udev_event
;
274 struct worker_message msg
;
277 log_debug("seq %llu running\n", udev_device_get_seqnum(dev
));
278 udev_event
= udev_event_new(dev
);
279 if (udev_event
== NULL
) {
284 /* needed for SIGCHLD/SIGTERM in spawn() */
285 udev_event
->fd_signal
= fd_signal
;
288 udev_event
->exec_delay
= exec_delay
;
290 /* apply rules, create node, symlinks */
291 err
= udev_event_execute_rules(udev_event
, rules
, &sigmask_orig
);
294 udev_event_execute_run(udev_event
, &sigmask_orig
);
296 /* apply/restore inotify watch */
297 if (err
== 0 && udev_event
->inotify_watch
) {
298 udev_watch_begin(udev
, dev
);
299 udev_device_update_db(dev
);
302 /* send processed event back to libudev listeners */
303 udev_monitor_send_device(worker_monitor
, NULL
, dev
);
305 /* send udevd the result of the event execution */
306 memset(&msg
, 0, sizeof(struct worker_message
));
310 send(worker_watch
[WRITE_END
], &msg
, sizeof(struct worker_message
), 0);
312 log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev
), err
);
314 udev_device_unref(dev
);
317 if (udev_event
->sigterm
) {
318 udev_event_unref(udev_event
);
322 udev_event_unref(udev_event
);
324 /* wait for more device messages from main udevd, or term signal */
325 while (dev
== NULL
) {
326 struct epoll_event ev
[4];
330 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), -1);
334 log_error("failed to poll: %m\n");
338 for (i
= 0; i
< fdcount
; i
++) {
339 if (ev
[i
].data
.fd
== fd_monitor
&& ev
[i
].events
& EPOLLIN
) {
340 dev
= udev_monitor_receive_device(worker_monitor
);
342 } else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
) {
343 struct signalfd_siginfo fdsi
;
346 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
347 if (size
!= sizeof(struct signalfd_siginfo
))
349 switch (fdsi
.ssi_signo
) {
358 udev_device_unref(dev
);
364 close(worker_watch
[WRITE_END
]);
365 udev_rules_unref(rules
);
366 udev_builtin_exit(udev
);
367 udev_monitor_unref(worker_monitor
);
373 udev_monitor_unref(worker_monitor
);
374 event
->state
= EVENT_QUEUED
;
376 log_error("fork of child failed: %m\n");
379 /* close monitor, but keep address around */
380 udev_monitor_disconnect(worker_monitor
);
381 worker
->monitor
= worker_monitor
;
383 worker
->state
= WORKER_RUNNING
;
384 worker
->event_start_usec
= now(CLOCK_MONOTONIC
);
385 worker
->event
= event
;
386 event
->state
= EVENT_RUNNING
;
387 udev_list_node_append(&worker
->node
, &worker_list
);
389 log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event
->dev
), pid
);
394 static void event_run(struct event
*event
)
396 struct udev_list_node
*loop
;
398 udev_list_node_foreach(loop
, &worker_list
) {
399 struct worker
*worker
= node_to_worker(loop
);
402 if (worker
->state
!= WORKER_IDLE
)
405 count
= udev_monitor_send_device(monitor
, worker
->monitor
, event
->dev
);
407 log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker
->pid
, count
);
408 kill(worker
->pid
, SIGKILL
);
409 worker
->state
= WORKER_KILLED
;
413 worker
->event
= event
;
414 worker
->state
= WORKER_RUNNING
;
415 worker
->event_start_usec
= now(CLOCK_MONOTONIC
);
416 event
->state
= EVENT_RUNNING
;
420 if (children
>= children_max
) {
421 if (children_max
> 1)
422 log_debug("maximum number (%i) of children reached\n", children
);
426 /* start new worker and pass initial device */
430 static int event_queue_insert(struct udev_device
*dev
)
434 event
= calloc(1, sizeof(struct event
));
438 event
->udev
= udev_device_get_udev(dev
);
440 event
->seqnum
= udev_device_get_seqnum(dev
);
441 event
->devpath
= udev_device_get_devpath(dev
);
442 event
->devpath_len
= strlen(event
->devpath
);
443 event
->devpath_old
= udev_device_get_devpath_old(dev
);
444 event
->devnum
= udev_device_get_devnum(dev
);
445 event
->is_block
= streq("block", udev_device_get_subsystem(dev
));
446 event
->ifindex
= udev_device_get_ifindex(dev
);
448 if (streq(udev_device_get_subsystem(dev
), "firmware"))
449 event
->nodelay
= true;
452 udev_queue_export_device_queued(udev_queue_export
, dev
);
453 log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev
),
454 udev_device_get_action(dev
), udev_device_get_subsystem(dev
));
456 event
->state
= EVENT_QUEUED
;
457 udev_list_node_append(&event
->node
, &event_list
);
461 static void worker_kill(struct udev
*udev
)
463 struct udev_list_node
*loop
;
465 udev_list_node_foreach(loop
, &worker_list
) {
466 struct worker
*worker
= node_to_worker(loop
);
468 if (worker
->state
== WORKER_KILLED
)
471 worker
->state
= WORKER_KILLED
;
472 kill(worker
->pid
, SIGTERM
);
476 /* lookup event for identical, parent, child device */
477 static bool is_devpath_busy(struct event
*event
)
479 struct udev_list_node
*loop
;
482 /* check if queue contains events we depend on */
483 udev_list_node_foreach(loop
, &event_list
) {
484 struct event
*loop_event
= node_to_event(loop
);
486 /* we already found a later event, earlier can not block us, no need to check again */
487 if (loop_event
->seqnum
< event
->delaying_seqnum
)
490 /* event we checked earlier still exists, no need to check again */
491 if (loop_event
->seqnum
== event
->delaying_seqnum
)
494 /* found ourself, no later event can block us */
495 if (loop_event
->seqnum
>= event
->seqnum
)
498 /* check major/minor */
499 if (major(event
->devnum
) != 0 && event
->devnum
== loop_event
->devnum
&& event
->is_block
== loop_event
->is_block
)
502 /* check network device ifindex */
503 if (event
->ifindex
!= 0 && event
->ifindex
== loop_event
->ifindex
)
506 /* check our old name */
507 if (event
->devpath_old
!= NULL
&& streq(loop_event
->devpath
, event
->devpath_old
)) {
508 event
->delaying_seqnum
= loop_event
->seqnum
;
512 /* compare devpath */
513 common
= MIN(loop_event
->devpath_len
, event
->devpath_len
);
515 /* one devpath is contained in the other? */
516 if (memcmp(loop_event
->devpath
, event
->devpath
, common
) != 0)
519 /* identical device event found */
520 if (loop_event
->devpath_len
== event
->devpath_len
) {
521 /* devices names might have changed/swapped in the meantime */
522 if (major(event
->devnum
) != 0 && (event
->devnum
!= loop_event
->devnum
|| event
->is_block
!= loop_event
->is_block
))
524 if (event
->ifindex
!= 0 && event
->ifindex
!= loop_event
->ifindex
)
526 event
->delaying_seqnum
= loop_event
->seqnum
;
531 /* allow to bypass the dependency tracking */
536 /* parent device event found */
537 if (event
->devpath
[common
] == '/') {
538 event
->delaying_seqnum
= loop_event
->seqnum
;
542 /* child device event found */
543 if (loop_event
->devpath
[common
] == '/') {
544 event
->delaying_seqnum
= loop_event
->seqnum
;
548 /* no matching device */
555 static void event_queue_start(struct udev
*udev
)
557 struct udev_list_node
*loop
;
559 udev_list_node_foreach(loop
, &event_list
) {
560 struct event
*event
= node_to_event(loop
);
562 if (event
->state
!= EVENT_QUEUED
)
565 /* do not start event if parent or child event is still running */
566 if (is_devpath_busy(event
))
573 static void event_queue_cleanup(struct udev
*udev
, enum event_state match_type
)
575 struct udev_list_node
*loop
, *tmp
;
577 udev_list_node_foreach_safe(loop
, tmp
, &event_list
) {
578 struct event
*event
= node_to_event(loop
);
580 if (match_type
!= EVENT_UNDEF
&& match_type
!= event
->state
)
583 event_queue_delete(event
, false);
587 static void worker_returned(int fd_worker
)
590 struct worker_message msg
;
592 struct udev_list_node
*loop
;
594 size
= recv(fd_worker
, &msg
, sizeof(struct worker_message
), MSG_DONTWAIT
);
595 if (size
!= sizeof(struct worker_message
))
598 /* lookup worker who sent the signal */
599 udev_list_node_foreach(loop
, &worker_list
) {
600 struct worker
*worker
= node_to_worker(loop
);
602 if (worker
->pid
!= msg
.pid
)
605 /* worker returned */
607 worker
->event
->exitcode
= msg
.exitcode
;
608 event_queue_delete(worker
->event
, true);
609 worker
->event
= NULL
;
611 if (worker
->state
!= WORKER_KILLED
)
612 worker
->state
= WORKER_IDLE
;
613 worker_unref(worker
);
619 /* receive the udevd message from userspace */
620 static struct udev_ctrl_connection
*handle_ctrl_msg(struct udev_ctrl
*uctrl
)
622 struct udev
*udev
= udev_ctrl_get_udev(uctrl
);
623 struct udev_ctrl_connection
*ctrl_conn
;
624 struct udev_ctrl_msg
*ctrl_msg
= NULL
;
628 ctrl_conn
= udev_ctrl_get_connection(uctrl
);
629 if (ctrl_conn
== NULL
)
632 ctrl_msg
= udev_ctrl_receive_msg(ctrl_conn
);
633 if (ctrl_msg
== NULL
)
636 i
= udev_ctrl_get_set_log_level(ctrl_msg
);
638 log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i
);
639 log_set_max_level(i
);
640 udev_set_log_priority(udev
, i
);
644 if (udev_ctrl_get_stop_exec_queue(ctrl_msg
) > 0) {
645 log_debug("udevd message (STOP_EXEC_QUEUE) received\n");
646 stop_exec_queue
= true;
649 if (udev_ctrl_get_start_exec_queue(ctrl_msg
) > 0) {
650 log_debug("udevd message (START_EXEC_QUEUE) received\n");
651 stop_exec_queue
= false;
654 if (udev_ctrl_get_reload(ctrl_msg
) > 0) {
655 log_debug("udevd message (RELOAD) received\n");
659 str
= udev_ctrl_get_set_env(ctrl_msg
);
667 val
= strchr(key
, '=');
671 if (val
[0] == '\0') {
672 log_debug("udevd message (ENV) received, unset '%s'\n", key
);
673 udev_add_property(udev
, key
, NULL
);
675 log_debug("udevd message (ENV) received, set '%s=%s'\n", key
, val
);
676 udev_add_property(udev
, key
, val
);
679 log_error("wrong key format '%s'\n", key
);
686 i
= udev_ctrl_get_set_children_max(ctrl_msg
);
688 log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i
);
692 if (udev_ctrl_get_ping(ctrl_msg
) > 0)
693 log_debug("udevd message (SYNC) received\n");
695 if (udev_ctrl_get_exit(ctrl_msg
) > 0) {
696 log_debug("udevd message (EXIT) received\n");
698 /* keep reference to block the client until we exit */
699 udev_ctrl_connection_ref(ctrl_conn
);
702 udev_ctrl_msg_unref(ctrl_msg
);
703 return udev_ctrl_connection_unref(ctrl_conn
);
706 /* read inotify messages */
707 static int handle_inotify(struct udev
*udev
)
711 struct inotify_event
*ev
;
713 if ((ioctl(fd_inotify
, FIONREAD
, &nbytes
) < 0) || (nbytes
<= 0))
716 buf
= malloc(nbytes
);
718 log_error("error getting buffer for inotify\n");
722 nbytes
= read(fd_inotify
, buf
, nbytes
);
724 for (pos
= 0; pos
< nbytes
; pos
+= sizeof(struct inotify_event
) + ev
->len
) {
725 struct udev_device
*dev
;
727 ev
= (struct inotify_event
*)(buf
+ pos
);
728 dev
= udev_watch_lookup(udev
, ev
->wd
);
730 log_debug("inotify event: %x for %s\n", ev
->mask
, udev_device_get_devnode(dev
));
731 if (ev
->mask
& IN_CLOSE_WRITE
) {
732 char filename
[UTIL_PATH_SIZE
];
735 log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev
));
736 strscpyl(filename
, sizeof(filename
), udev_device_get_syspath(dev
), "/uevent", NULL
);
737 fd
= open(filename
, O_WRONLY
);
739 if (write(fd
, "change", 6) < 0)
740 log_debug("error writing uevent: %m\n");
744 if (ev
->mask
& IN_IGNORED
)
745 udev_watch_end(udev
, dev
);
747 udev_device_unref(dev
);
756 static void handle_signal(struct udev
*udev
, int signo
)
767 struct udev_list_node
*loop
, *tmp
;
769 pid
= waitpid(-1, &status
, WNOHANG
);
773 udev_list_node_foreach_safe(loop
, tmp
, &worker_list
) {
774 struct worker
*worker
= node_to_worker(loop
);
776 if (worker
->pid
!= pid
)
778 log_debug("worker [%u] exit\n", pid
);
780 if (WIFEXITED(status
)) {
781 if (WEXITSTATUS(status
) != 0)
782 log_error("worker [%u] exit with return code %i\n", pid
, WEXITSTATUS(status
));
783 } else if (WIFSIGNALED(status
)) {
784 log_error("worker [%u] terminated by signal %i (%s)\n",
785 pid
, WTERMSIG(status
), strsignal(WTERMSIG(status
)));
786 } else if (WIFSTOPPED(status
)) {
787 log_error("worker [%u] stopped\n", pid
);
788 } else if (WIFCONTINUED(status
)) {
789 log_error("worker [%u] continued\n", pid
);
791 log_error("worker [%u] exit with status 0x%04x\n", pid
, status
);
794 if (!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
796 log_error("worker [%u] failed while handling '%s'\n",
797 pid
, worker
->event
->devpath
);
798 worker
->event
->exitcode
= -32;
799 event_queue_delete(worker
->event
, true);
800 /* drop reference taken for state 'running' */
801 worker_unref(worker
);
804 worker_unref(worker
);
815 static void static_dev_create_from_modules(struct udev
*udev
)
817 struct utsname kernel
;
818 char modules
[UTIL_PATH_SIZE
];
822 if (uname(&kernel
) < 0) {
823 log_error("uname failed: %m");
827 strscpyl(modules
, sizeof(modules
), ROOTPREFIX
"/lib/modules/", kernel
.release
, "/modules.devname", NULL
);
828 f
= fopen(modules
, "re");
832 while (fgets(buf
, sizeof(buf
), f
) != NULL
) {
840 char filename
[UTIL_PATH_SIZE
];
846 s
= strchr(modname
, ' ');
852 s
= strchr(devname
, ' ');
858 s
= strchr(devno
, ' ');
860 s
= strchr(devno
, '\n');
863 if (sscanf(devno
, "%c%u:%u", &type
, &maj
, &min
) != 3)
869 else if (type
== 'b')
874 strscpyl(filename
, sizeof(filename
), "/dev/", devname
, NULL
);
875 mkdir_parents_label(filename
, 0755);
876 label_context_set(filename
, mode
);
877 log_debug("mknod '%s' %c%u:%u\n", filename
, type
, maj
, min
);
878 if (mknod(filename
, mode
, makedev(maj
, min
)) < 0 && errno
== EEXIST
)
879 utimensat(AT_FDCWD
, filename
, NULL
, 0);
880 label_context_clear();
886 static int systemd_fds(struct udev
*udev
, int *rctrl
, int *rnetlink
)
888 int ctrl
= -1, netlink
= -1;
891 n
= sd_listen_fds(true);
895 for (fd
= SD_LISTEN_FDS_START
; fd
< n
+ SD_LISTEN_FDS_START
; fd
++) {
896 if (sd_is_socket(fd
, AF_LOCAL
, SOCK_SEQPACKET
, -1)) {
903 if (sd_is_socket(fd
, AF_NETLINK
, SOCK_RAW
, -1)) {
913 if (ctrl
< 0 || netlink
< 0)
916 log_debug("ctrl=%i netlink=%i\n", ctrl
, netlink
);
923 * read the kernel commandline, in case we need to get into debug mode
924 * udev.log-priority=<level> syslog priority
925 * udev.children-max=<number of workers> events are fully serialized if set to 1
926 * udev.exec-delay=<number of seconds> delay execution of every executed program
928 static void kernel_cmdline_options(struct udev
*udev
)
930 char *line
, *w
, *state
;
933 if (read_one_line_file("/proc/cmdline", &line
) < 0)
936 FOREACH_WORD_QUOTED(w
, l
, line
, state
) {
943 /* accept the same options for the initrd, prefixed with "rd." */
944 if (in_initrd() && startswith(s
, "rd."))
949 if (startswith(opt
, "udev.log-priority=")) {
952 prio
= util_log_priority(opt
+ 18);
953 log_set_max_level(prio
);
954 udev_set_log_priority(udev
, prio
);
955 } else if (startswith(opt
, "udev.children-max=")) {
956 children_max
= strtoul(opt
+ 18, NULL
, 0);
957 } else if (startswith(opt
, "udev.exec-delay=")) {
958 exec_delay
= strtoul(opt
+ 16, NULL
, 0);
967 int main(int argc
, char *argv
[])
971 int daemonize
= false;
972 int resolve_names
= 1;
973 static const struct option options
[] = {
974 { "daemon", no_argument
, NULL
, 'd' },
975 { "debug", no_argument
, NULL
, 'D' },
976 { "children-max", required_argument
, NULL
, 'c' },
977 { "exec-delay", required_argument
, NULL
, 'e' },
978 { "resolve-names", required_argument
, NULL
, 'N' },
979 { "help", no_argument
, NULL
, 'h' },
980 { "version", no_argument
, NULL
, 'V' },
986 struct epoll_event ep_ctrl
, ep_inotify
, ep_signal
, ep_netlink
, ep_worker
;
987 struct udev_ctrl_connection
*ctrl_conn
= NULL
;
994 log_set_target(LOG_TARGET_AUTO
);
995 log_parse_environment();
997 udev_set_log_fn(udev
, udev_main_log
);
998 log_debug("version %s\n", VERSION
);
1004 option
= getopt_long(argc
, argv
, "c:de:DtN:hV", options
, NULL
);
1013 children_max
= strtoul(optarg
, NULL
, 0);
1016 exec_delay
= strtoul(optarg
, NULL
, 0);
1020 log_set_max_level(LOG_DEBUG
);
1021 udev_set_log_priority(udev
, LOG_DEBUG
);
1024 if (streq(optarg
, "early")) {
1026 } else if (streq(optarg
, "late")) {
1028 } else if (streq(optarg
, "never")) {
1031 fprintf(stderr
, "resolve-names must be early, late or never\n");
1032 log_error("resolve-names must be early, late or never\n");
1037 printf("Usage: udevd OPTIONS\n"
1040 " --children-max=<maximum number of workers>\n"
1041 " --exec-delay=<seconds to wait before executing RUN=>\n"
1042 " --resolve-names=early|late|never\n"
1048 printf("%s\n", VERSION
);
1055 kernel_cmdline_options(udev
);
1057 if (getuid() != 0) {
1058 fprintf(stderr
, "root privileges required\n");
1059 log_error("root privileges required\n");
1063 /* set umask before creating any file/directory */
1067 mkdir("/run/udev", 0755);
1070 static_dev_create_from_modules(udev
);
1072 /* before opening new files, make sure std{in,out,err} fds are in a sane state */
1076 fd
= open("/dev/null", O_RDWR
);
1078 if (write(STDOUT_FILENO
, 0, 0) < 0)
1079 dup2(fd
, STDOUT_FILENO
);
1080 if (write(STDERR_FILENO
, 0, 0) < 0)
1081 dup2(fd
, STDERR_FILENO
);
1082 if (fd
> STDERR_FILENO
)
1085 fprintf(stderr
, "cannot open /dev/null\n");
1086 log_error("cannot open /dev/null\n");
1090 if (systemd_fds(udev
, &fd_ctrl
, &fd_netlink
) >= 0) {
1091 /* get control and netlink socket from systemd */
1092 udev_ctrl
= udev_ctrl_new_from_fd(udev
, fd_ctrl
);
1093 if (udev_ctrl
== NULL
) {
1094 log_error("error taking over udev control socket");
1099 monitor
= udev_monitor_new_from_netlink_fd(udev
, "kernel", fd_netlink
);
1100 if (monitor
== NULL
) {
1101 log_error("error taking over netlink socket\n");
1106 /* get our own cgroup, we regularly kill everything udev has left behind */
1107 if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER
, 0, &udev_cgroup
) < 0)
1110 /* open control and netlink socket */
1111 udev_ctrl
= udev_ctrl_new(udev
);
1112 if (udev_ctrl
== NULL
) {
1113 fprintf(stderr
, "error initializing udev control socket");
1114 log_error("error initializing udev control socket");
1118 fd_ctrl
= udev_ctrl_get_fd(udev_ctrl
);
1120 monitor
= udev_monitor_new_from_netlink(udev
, "kernel");
1121 if (monitor
== NULL
) {
1122 fprintf(stderr
, "error initializing netlink socket\n");
1123 log_error("error initializing netlink socket\n");
1127 fd_netlink
= udev_monitor_get_fd(monitor
);
1130 if (udev_monitor_enable_receiving(monitor
) < 0) {
1131 fprintf(stderr
, "error binding netlink socket\n");
1132 log_error("error binding netlink socket\n");
1137 if (udev_ctrl_enable_receiving(udev_ctrl
) < 0) {
1138 fprintf(stderr
, "error binding udev control socket\n");
1139 log_error("error binding udev control socket\n");
1144 udev_monitor_set_receive_buffer_size(monitor
, 128*1024*1024);
1146 /* create queue file before signalling 'ready', to make sure we block 'settle' */
1147 udev_queue_export
= udev_queue_export_new(udev
);
1148 if (udev_queue_export
== NULL
) {
1149 log_error("error creating queue file\n");
1161 log_error("fork of daemon failed: %m\n");
1166 goto exit_daemonize
;
1171 write_string_file("/proc/self/oom_score_adj", "-1000");
1173 sd_notify(1, "READY=1");
1176 print_kmsg("starting version " VERSION
"\n");
1181 fd
= open("/dev/null", O_RDWR
);
1183 dup2(fd
, STDIN_FILENO
);
1184 dup2(fd
, STDOUT_FILENO
);
1185 dup2(fd
, STDERR_FILENO
);
1190 fd_inotify
= udev_watch_init(udev
);
1191 if (fd_inotify
< 0) {
1192 fprintf(stderr
, "error initializing inotify\n");
1193 log_error("error initializing inotify\n");
1197 udev_watch_restore(udev
);
1199 /* block and listen to all signals on signalfd */
1201 sigprocmask(SIG_SETMASK
, &mask
, &sigmask_orig
);
1202 fd_signal
= signalfd(-1, &mask
, SFD_NONBLOCK
|SFD_CLOEXEC
);
1203 if (fd_signal
< 0) {
1204 fprintf(stderr
, "error creating signalfd\n");
1205 log_error("error creating signalfd\n");
1210 /* unnamed socket from workers to the main daemon */
1211 if (socketpair(AF_LOCAL
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, worker_watch
) < 0) {
1212 fprintf(stderr
, "error creating socketpair\n");
1213 log_error("error creating socketpair\n");
1217 fd_worker
= worker_watch
[READ_END
];
1219 udev_builtin_init(udev
);
1221 rules
= udev_rules_new(udev
, resolve_names
);
1222 if (rules
== NULL
) {
1223 log_error("error reading rules\n");
1227 memset(&ep_ctrl
, 0, sizeof(struct epoll_event
));
1228 ep_ctrl
.events
= EPOLLIN
;
1229 ep_ctrl
.data
.fd
= fd_ctrl
;
1231 memset(&ep_inotify
, 0, sizeof(struct epoll_event
));
1232 ep_inotify
.events
= EPOLLIN
;
1233 ep_inotify
.data
.fd
= fd_inotify
;
1235 memset(&ep_signal
, 0, sizeof(struct epoll_event
));
1236 ep_signal
.events
= EPOLLIN
;
1237 ep_signal
.data
.fd
= fd_signal
;
1239 memset(&ep_netlink
, 0, sizeof(struct epoll_event
));
1240 ep_netlink
.events
= EPOLLIN
;
1241 ep_netlink
.data
.fd
= fd_netlink
;
1243 memset(&ep_worker
, 0, sizeof(struct epoll_event
));
1244 ep_worker
.events
= EPOLLIN
;
1245 ep_worker
.data
.fd
= fd_worker
;
1247 fd_ep
= epoll_create1(EPOLL_CLOEXEC
);
1249 log_error("error creating epoll fd: %m\n");
1252 if (epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_ctrl
, &ep_ctrl
) < 0 ||
1253 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_inotify
, &ep_inotify
) < 0 ||
1254 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_signal
, &ep_signal
) < 0 ||
1255 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_netlink
, &ep_netlink
) < 0 ||
1256 epoll_ctl(fd_ep
, EPOLL_CTL_ADD
, fd_worker
, &ep_worker
) < 0) {
1257 log_error("fail to add fds to epoll: %m\n");
1261 if (children_max
<= 0) {
1266 if (sched_getaffinity(0, sizeof (cpu_set
), &cpu_set
) == 0) {
1267 children_max
+= CPU_COUNT(&cpu_set
) * 2;
1270 log_debug("set children_max to %u\n", children_max
);
1272 udev_rules_apply_static_dev_perms(rules
);
1274 udev_list_node_init(&event_list
);
1275 udev_list_node_init(&worker_list
);
1278 static usec_t last_usec
;
1279 struct epoll_event ev
[8];
1282 bool is_worker
, is_signal
, is_inotify
, is_netlink
, is_ctrl
;
1286 /* close sources of new events and discard buffered events */
1288 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_ctrl
, NULL
);
1291 if (monitor
!= NULL
) {
1292 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_netlink
, NULL
);
1293 udev_monitor_unref(monitor
);
1296 if (fd_inotify
>= 0) {
1297 epoll_ctl(fd_ep
, EPOLL_CTL_DEL
, fd_inotify
, NULL
);
1302 /* discard queued events and kill workers */
1303 event_queue_cleanup(udev
, EVENT_QUEUED
);
1306 /* exit after all has cleaned up */
1307 if (udev_list_node_is_empty(&event_list
) && udev_list_node_is_empty(&worker_list
))
1310 /* timeout at exit for workers to finish */
1311 timeout
= 30 * 1000;
1312 } else if (udev_list_node_is_empty(&event_list
) && !children
) {
1316 /* cleanup possible left-over processes in our cgroup */
1318 cg_kill(SYSTEMD_CGROUP_CONTROLLER
, udev_cgroup
, SIGKILL
, false, true, NULL
);
1320 /* kill idle or hanging workers */
1323 fdcount
= epoll_wait(fd_ep
, ev
, ELEMENTSOF(ev
), timeout
);
1328 struct udev_list_node
*loop
;
1332 log_error("timeout, giving up waiting for workers to finish\n");
1336 /* kill idle workers */
1337 if (udev_list_node_is_empty(&event_list
)) {
1338 log_debug("cleanup idle workers\n");
1342 /* check for hanging events */
1343 udev_list_node_foreach(loop
, &worker_list
) {
1344 struct worker
*worker
= node_to_worker(loop
);
1346 if (worker
->state
!= WORKER_RUNNING
)
1349 if ((now(CLOCK_MONOTONIC
) - worker
->event_start_usec
) > 30 * 1000 * 1000) {
1350 log_error("worker [%u] %s timeout; kill it\n", worker
->pid
,
1351 worker
->event
? worker
->event
->devpath
: "<idle>");
1352 kill(worker
->pid
, SIGKILL
);
1353 worker
->state
= WORKER_KILLED
;
1354 /* drop reference taken for state 'running' */
1355 worker_unref(worker
);
1356 if (worker
->event
) {
1357 log_error("seq %llu '%s' killed\n",
1358 udev_device_get_seqnum(worker
->event
->dev
), worker
->event
->devpath
);
1359 worker
->event
->exitcode
= -64;
1360 event_queue_delete(worker
->event
, true);
1361 worker
->event
= NULL
;
1368 is_worker
= is_signal
= is_inotify
= is_netlink
= is_ctrl
= false;
1369 for (i
= 0; i
< fdcount
; i
++) {
1370 if (ev
[i
].data
.fd
== fd_worker
&& ev
[i
].events
& EPOLLIN
)
1372 else if (ev
[i
].data
.fd
== fd_netlink
&& ev
[i
].events
& EPOLLIN
)
1374 else if (ev
[i
].data
.fd
== fd_signal
&& ev
[i
].events
& EPOLLIN
)
1376 else if (ev
[i
].data
.fd
== fd_inotify
&& ev
[i
].events
& EPOLLIN
)
1378 else if (ev
[i
].data
.fd
== fd_ctrl
&& ev
[i
].events
& EPOLLIN
)
1382 /* check for changed config, every 3 seconds at most */
1383 if ((now(CLOCK_MONOTONIC
) - last_usec
) > 3 * 1000 * 1000) {
1384 if (udev_rules_check_timestamp(rules
))
1386 if (udev_builtin_validate(udev
))
1389 last_usec
= now(CLOCK_MONOTONIC
);
1392 /* reload requested, HUP signal received, rules changed, builtin changed */
1395 rules
= udev_rules_unref(rules
);
1396 udev_builtin_exit(udev
);
1400 /* event has finished */
1402 worker_returned(fd_worker
);
1405 struct udev_device
*dev
;
1407 dev
= udev_monitor_receive_device(monitor
);
1409 udev_device_set_usec_initialized(dev
, now(CLOCK_MONOTONIC
));
1410 if (event_queue_insert(dev
) < 0)
1411 udev_device_unref(dev
);
1415 /* start new events */
1416 if (!udev_list_node_is_empty(&event_list
) && !udev_exit
&& !stop_exec_queue
) {
1417 udev_builtin_init(udev
);
1419 rules
= udev_rules_new(udev
, resolve_names
);
1421 event_queue_start(udev
);
1425 struct signalfd_siginfo fdsi
;
1428 size
= read(fd_signal
, &fdsi
, sizeof(struct signalfd_siginfo
));
1429 if (size
== sizeof(struct signalfd_siginfo
))
1430 handle_signal(udev
, fdsi
.ssi_signo
);
1433 /* we are shutting down, the events below are not handled anymore */
1437 /* device node watch */
1439 handle_inotify(udev
);
1442 * This needs to be after the inotify handling, to make sure,
1443 * that the ping is send back after the possibly generated
1444 * "change" events by the inotify device node watch.
1446 * A single time we may receive a client connection which we need to
1447 * keep open to block the client. It will be closed right before we
1451 ctrl_conn
= handle_ctrl_msg(udev_ctrl
);
1456 udev_queue_export_cleanup(udev_queue_export
);
1457 udev_ctrl_cleanup(udev_ctrl
);
1461 worker_list_cleanup(udev
);
1462 event_queue_cleanup(udev
, EVENT_UNDEF
);
1463 udev_rules_unref(rules
);
1464 udev_builtin_exit(udev
);
1467 if (worker_watch
[READ_END
] >= 0)
1468 close(worker_watch
[READ_END
]);
1469 if (worker_watch
[WRITE_END
] >= 0)
1470 close(worker_watch
[WRITE_END
]);
1471 udev_monitor_unref(monitor
);
1472 udev_queue_export_unref(udev_queue_export
);
1473 udev_ctrl_connection_unref(ctrl_conn
);
1474 udev_ctrl_unref(udev_ctrl
);