1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca>
4 * Copyright © 2009 Canonical Ltd.
5 * Copyright © 2009 Scott James Remnant <scott@netsplit.com>
15 #include <sys/epoll.h>
17 #include <sys/inotify.h>
18 #include <sys/ioctl.h>
19 #include <sys/mount.h>
20 #include <sys/prctl.h>
21 #include <sys/signalfd.h>
27 #include "sd-daemon.h"
30 #include "alloc-util.h"
32 #include "cgroup-util.h"
33 #include "cpu-set-util.h"
34 #include "dev-setup.h"
35 #include "device-monitor-private.h"
36 #include "device-private.h"
37 #include "device-util.h"
38 #include "event-util.h"
41 #include "format-util.h"
45 #include "libudev-device-internal.h"
46 #include "limits-util.h"
48 #include "main-func.h"
50 #include "netlink-util.h"
51 #include "parse-util.h"
52 #include "pretty-print.h"
53 #include "proc-cmdline.h"
54 #include "process-util.h"
55 #include "selinux-util.h"
56 #include "signal-util.h"
57 #include "socket-util.h"
58 #include "string-util.h"
61 #include "syslog-util.h"
63 #include "udev-builtin.h"
64 #include "udev-ctrl.h"
65 #include "udev-event.h"
66 #include "udev-util.h"
67 #include "udev-watch.h"
68 #include "user-util.h"
70 #define WORKER_NUM_MAX 2048U
72 static bool arg_debug
= false;
73 static int arg_daemonize
= false;
74 static ResolveNameTiming arg_resolve_name_timing
= RESOLVE_NAME_EARLY
;
75 static unsigned arg_children_max
= 0;
76 static usec_t arg_exec_delay_usec
= 0;
77 static usec_t arg_event_timeout_usec
= 180 * USEC_PER_SEC
;
78 static int arg_timeout_signal
= SIGKILL
;
79 static bool arg_blockdev_read_only
= false;
81 typedef struct Manager
{
84 LIST_HEAD(struct event
, events
);
86 pid_t pid
; /* the process that originally allocated the manager object */
93 sd_device_monitor
*monitor
;
94 struct udev_ctrl
*ctrl
;
98 sd_event_source
*inotify_event
;
99 sd_event_source
*kill_workers_event
;
103 bool stop_exec_queue
:1;
115 struct worker
*worker
;
116 enum event_state state
;
119 sd_device
*dev_kernel
; /* clone of originally received device */
122 uint64_t delaying_seqnum
;
124 sd_event_source
*timeout_warning_event
;
125 sd_event_source
*timeout_event
;
127 LIST_FIELDS(struct event
, event
);
130 static void event_queue_cleanup(Manager
*manager
, enum event_state type
);
142 sd_device_monitor
*monitor
;
143 enum worker_state state
;
147 /* passed from worker to main process */
148 struct worker_message
{
151 static void event_free(struct event
*event
) {
155 assert(event
->manager
);
157 LIST_REMOVE(event
, event
->manager
->events
, event
);
158 sd_device_unref(event
->dev
);
159 sd_device_unref(event
->dev_kernel
);
161 sd_event_source_unref(event
->timeout_warning_event
);
162 sd_event_source_unref(event
->timeout_event
);
165 event
->worker
->event
= NULL
;
167 /* only clean up the queue from the process that created it */
168 if (LIST_IS_EMPTY(event
->manager
->events
) &&
169 event
->manager
->pid
== getpid_cached())
170 if (unlink("/run/udev/queue") < 0)
171 log_warning_errno(errno
, "Failed to unlink /run/udev/queue: %m");
176 static void worker_free(struct worker
*worker
) {
180 assert(worker
->manager
);
182 hashmap_remove(worker
->manager
->workers
, PID_TO_PTR(worker
->pid
));
183 sd_device_monitor_unref(worker
->monitor
);
184 event_free(worker
->event
);
189 DEFINE_TRIVIAL_CLEANUP_FUNC(struct worker
*, worker_free
);
190 DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op
, void, trivial_hash_func
, trivial_compare_func
, struct worker
, worker_free
);
192 static int worker_new(struct worker
**ret
, Manager
*manager
, sd_device_monitor
*worker_monitor
, pid_t pid
) {
193 _cleanup_(worker_freep
) struct worker
*worker
= NULL
;
198 assert(worker_monitor
);
201 /* close monitor, but keep address around */
202 device_monitor_disconnect(worker_monitor
);
204 worker
= new(struct worker
, 1);
208 *worker
= (struct worker
) {
210 .monitor
= sd_device_monitor_ref(worker_monitor
),
214 r
= hashmap_ensure_allocated(&manager
->workers
, &worker_hash_op
);
218 r
= hashmap_put(manager
->workers
, PID_TO_PTR(pid
), worker
);
222 *ret
= TAKE_PTR(worker
);
227 static int on_event_timeout(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
228 struct event
*event
= userdata
;
231 assert(event
->worker
);
233 kill_and_sigcont(event
->worker
->pid
, arg_timeout_signal
);
234 event
->worker
->state
= WORKER_KILLED
;
236 log_device_error(event
->dev
, "Worker ["PID_FMT
"] processing SEQNUM=%"PRIu64
" killed", event
->worker
->pid
, event
->seqnum
);
241 static int on_event_timeout_warning(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
242 struct event
*event
= userdata
;
245 assert(event
->worker
);
247 log_device_warning(event
->dev
, "Worker ["PID_FMT
"] processing SEQNUM=%"PRIu64
" is taking a long time", event
->worker
->pid
, event
->seqnum
);
252 static void worker_attach_event(struct worker
*worker
, struct event
*event
) {
257 assert(worker
->manager
);
259 assert(!event
->worker
);
260 assert(!worker
->event
);
262 worker
->state
= WORKER_RUNNING
;
263 worker
->event
= event
;
264 event
->state
= EVENT_RUNNING
;
265 event
->worker
= worker
;
267 e
= worker
->manager
->event
;
269 assert_se(sd_event_now(e
, CLOCK_MONOTONIC
, &usec
) >= 0);
271 (void) sd_event_add_time(e
, &event
->timeout_warning_event
, CLOCK_MONOTONIC
,
272 usec
+ udev_warn_timeout(arg_event_timeout_usec
), USEC_PER_SEC
, on_event_timeout_warning
, event
);
274 (void) sd_event_add_time(e
, &event
->timeout_event
, CLOCK_MONOTONIC
,
275 usec
+ arg_event_timeout_usec
, USEC_PER_SEC
, on_event_timeout
, event
);
278 static void manager_clear_for_worker(Manager
*manager
) {
281 manager
->inotify_event
= sd_event_source_unref(manager
->inotify_event
);
282 manager
->kill_workers_event
= sd_event_source_unref(manager
->kill_workers_event
);
284 manager
->event
= sd_event_unref(manager
->event
);
286 manager
->workers
= hashmap_free(manager
->workers
);
287 event_queue_cleanup(manager
, EVENT_UNDEF
);
289 manager
->monitor
= sd_device_monitor_unref(manager
->monitor
);
290 manager
->ctrl
= udev_ctrl_unref(manager
->ctrl
);
292 manager
->worker_watch
[READ_END
] = safe_close(manager
->worker_watch
[READ_END
]);
295 static void manager_free(Manager
*manager
) {
301 if (manager
->pid
== getpid_cached())
302 udev_ctrl_cleanup(manager
->ctrl
);
304 manager_clear_for_worker(manager
);
306 sd_netlink_unref(manager
->rtnl
);
308 hashmap_free_free_free(manager
->properties
);
309 udev_rules_free(manager
->rules
);
311 safe_close(manager
->fd_inotify
);
312 safe_close_pair(manager
->worker_watch
);
317 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager
*, manager_free
);
319 static int worker_send_message(int fd
) {
320 struct worker_message message
= {};
322 return loop_write(fd
, &message
, sizeof(message
), false);
325 static int worker_lock_block_device(sd_device
*dev
, int *ret_fd
) {
326 _cleanup_close_
int fd
= -1;
334 * Take a shared lock on the device node; this establishes
335 * a concept of device "ownership" to serialize device
336 * access. External processes holding an exclusive lock will
337 * cause udev to skip the event handling; in the case udev
338 * acquired the lock, the external process can block until
339 * udev has finished its event handling.
342 if (device_for_action(dev
, DEVICE_ACTION_REMOVE
))
345 r
= sd_device_get_subsystem(dev
, &val
);
347 return log_device_debug_errno(dev
, r
, "Failed to get subsystem: %m");
349 if (!streq(val
, "block"))
352 r
= sd_device_get_sysname(dev
, &val
);
354 return log_device_debug_errno(dev
, r
, "Failed to get sysname: %m");
356 if (STARTSWITH_SET(val
, "dm-", "md", "drbd"))
359 r
= sd_device_get_devtype(dev
, &val
);
360 if (r
< 0 && r
!= -ENOENT
)
361 return log_device_debug_errno(dev
, r
, "Failed to get devtype: %m");
362 if (r
>= 0 && streq(val
, "partition")) {
363 r
= sd_device_get_parent(dev
, &dev
);
365 return log_device_debug_errno(dev
, r
, "Failed to get parent device: %m");
368 r
= sd_device_get_devname(dev
, &val
);
372 return log_device_debug_errno(dev
, r
, "Failed to get devname: %m");
374 fd
= open(val
, O_RDONLY
|O_CLOEXEC
|O_NOFOLLOW
|O_NONBLOCK
);
376 log_device_debug_errno(dev
, errno
, "Failed to open '%s', ignoring: %m", val
);
380 if (flock(fd
, LOCK_SH
|LOCK_NB
) < 0)
381 return log_device_debug_errno(dev
, errno
, "Failed to flock(%s): %m", val
);
383 *ret_fd
= TAKE_FD(fd
);
387 static int worker_mark_block_device_read_only(sd_device
*dev
) {
388 _cleanup_close_
int fd
= -1;
394 if (!arg_blockdev_read_only
)
397 /* Do this only once, when the block device is new. If the device is later retriggered let's not
398 * toggle the bit again, so that people can boot up with full read-only mode and then unset the bit
399 * for specific devices only. */
400 if (!device_for_action(dev
, DEVICE_ACTION_ADD
))
403 r
= sd_device_get_subsystem(dev
, &val
);
405 return log_device_debug_errno(dev
, r
, "Failed to get subsystem: %m");
407 if (!streq(val
, "block"))
410 r
= sd_device_get_sysname(dev
, &val
);
412 return log_device_debug_errno(dev
, r
, "Failed to get sysname: %m");
414 /* Exclude synthetic devices for now, this is supposed to be a safety feature to avoid modification
415 * of physical devices, and what sits on top of those doesn't really matter if we don't allow the
416 * underlying block devices to recieve changes. */
417 if (STARTSWITH_SET(val
, "dm-", "md", "drbd", "loop", "nbd", "zram"))
420 r
= sd_device_get_devname(dev
, &val
);
424 return log_device_debug_errno(dev
, r
, "Failed to get devname: %m");
426 fd
= open(val
, O_RDONLY
|O_CLOEXEC
|O_NOFOLLOW
|O_NONBLOCK
);
428 return log_device_debug_errno(dev
, errno
, "Failed to open '%s', ignoring: %m", val
);
430 if (ioctl(fd
, BLKROSET
, &state
) < 0)
431 return log_device_warning_errno(dev
, errno
, "Failed to mark block device '%s' read-only: %m", val
);
433 log_device_info(dev
, "Successfully marked block device '%s' read-only.", val
);
437 static int worker_process_device(Manager
*manager
, sd_device
*dev
) {
438 _cleanup_(udev_event_freep
) UdevEvent
*udev_event
= NULL
;
439 _cleanup_close_
int fd_lock
= -1;
447 r
= device_get_seqnum(dev
, &seqnum
);
449 return log_device_debug_errno(dev
, r
, "Failed to get SEQNUM: %m");
451 r
= device_get_action(dev
, &action
);
453 return log_device_debug_errno(dev
, r
, "Failed to get ACTION: %m");
455 log_device_debug(dev
, "Processing device (SEQNUM=%"PRIu64
", ACTION=%s)",
456 seqnum
, device_action_to_string(action
));
458 udev_event
= udev_event_new(dev
, arg_exec_delay_usec
, manager
->rtnl
);
462 r
= worker_lock_block_device(dev
, &fd_lock
);
466 (void) worker_mark_block_device_read_only(dev
);
468 /* apply rules, create node, symlinks */
469 r
= udev_event_execute_rules(udev_event
, arg_event_timeout_usec
, arg_timeout_signal
, manager
->properties
, manager
->rules
);
473 udev_event_execute_run(udev_event
, arg_event_timeout_usec
, arg_timeout_signal
);
476 /* in case rtnl was initialized */
477 manager
->rtnl
= sd_netlink_ref(udev_event
->rtnl
);
479 /* apply/restore inotify watch */
480 if (udev_event
->inotify_watch
) {
481 (void) udev_watch_begin(dev
);
482 r
= device_update_db(dev
);
484 return log_device_debug_errno(dev
, r
, "Failed to update database under /run/udev/data/: %m");
487 log_device_debug(dev
, "Device (SEQNUM=%"PRIu64
", ACTION=%s) processed",
488 seqnum
, device_action_to_string(action
));
493 static int worker_device_monitor_handler(sd_device_monitor
*monitor
, sd_device
*dev
, void *userdata
) {
494 Manager
*manager
= userdata
;
500 r
= worker_process_device(manager
, dev
);
502 /* if we couldn't acquire the flock(), then proceed quietly */
503 log_device_debug_errno(dev
, r
, "Device currently locked, not processing.");
506 log_device_warning_errno(dev
, r
, "Failed to process device, ignoring: %m");
508 /* send processed event back to libudev listeners */
509 r
= device_monitor_send_device(monitor
, NULL
, dev
);
511 log_device_warning_errno(dev
, r
, "Failed to send device, ignoring: %m");
514 /* send udevd the result of the event execution */
515 r
= worker_send_message(manager
->worker_watch
[WRITE_END
]);
517 log_device_warning_errno(dev
, r
, "Failed to send signal to main daemon, ignoring: %m");
522 static int worker_main(Manager
*_manager
, sd_device_monitor
*monitor
, sd_device
*first_device
) {
523 _cleanup_(sd_device_unrefp
) sd_device
*dev
= first_device
;
524 _cleanup_(manager_freep
) Manager
*manager
= _manager
;
531 unsetenv("NOTIFY_SOCKET");
533 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGTERM
, -1) >= 0);
535 /* Reset OOM score, we only protect the main daemon. */
536 r
= set_oom_score_adjust(0);
538 log_debug_errno(r
, "Failed to reset OOM score, ignoring: %m");
540 /* Clear unnecessary data in Manager object.*/
541 manager_clear_for_worker(manager
);
543 r
= sd_event_new(&manager
->event
);
545 return log_error_errno(r
, "Failed to allocate event loop: %m");
547 r
= sd_event_add_signal(manager
->event
, NULL
, SIGTERM
, NULL
, NULL
);
549 return log_error_errno(r
, "Failed to set SIGTERM event: %m");
551 r
= sd_device_monitor_attach_event(monitor
, manager
->event
);
553 return log_error_errno(r
, "Failed to attach event loop to device monitor: %m");
555 r
= sd_device_monitor_start(monitor
, worker_device_monitor_handler
, manager
);
557 return log_error_errno(r
, "Failed to start device monitor: %m");
559 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(monitor
), "worker-device-monitor");
561 /* Process first device */
562 (void) worker_device_monitor_handler(monitor
, dev
, manager
);
564 r
= sd_event_loop(manager
->event
);
566 return log_error_errno(r
, "Event loop failed: %m");
571 static int worker_spawn(Manager
*manager
, struct event
*event
) {
572 _cleanup_(sd_device_monitor_unrefp
) sd_device_monitor
*worker_monitor
= NULL
;
573 struct worker
*worker
;
577 /* listen for new events */
578 r
= device_monitor_new_full(&worker_monitor
, MONITOR_GROUP_NONE
, -1);
582 /* allow the main daemon netlink address to send devices to the worker */
583 r
= device_monitor_allow_unicast_sender(worker_monitor
, manager
->monitor
);
585 return log_error_errno(r
, "Worker: Failed to set unicast sender: %m");
587 r
= device_monitor_enable_receiving(worker_monitor
);
589 return log_error_errno(r
, "Worker: Failed to enable receiving of device: %m");
591 r
= safe_fork(NULL
, FORK_DEATHSIG
, &pid
);
593 event
->state
= EVENT_QUEUED
;
594 return log_error_errno(r
, "Failed to fork() worker: %m");
598 r
= worker_main(manager
, worker_monitor
, sd_device_ref(event
->dev
));
600 _exit(r
< 0 ? EXIT_FAILURE
: EXIT_SUCCESS
);
603 r
= worker_new(&worker
, manager
, worker_monitor
, pid
);
605 return log_error_errno(r
, "Failed to create worker object: %m");
607 worker_attach_event(worker
, event
);
609 log_device_debug(event
->dev
, "Worker ["PID_FMT
"] is forked for processing SEQNUM=%"PRIu64
".", pid
, event
->seqnum
);
613 static void event_run(Manager
*manager
, struct event
*event
) {
614 static bool log_children_max_reached
= true;
615 struct worker
*worker
;
625 r
= device_get_action(event
->dev
, &action
);
626 log_device_debug(event
->dev
, "Device (SEQNUM=%"PRIu64
", ACTION=%s) ready for processing",
627 event
->seqnum
, r
>= 0 ? device_action_to_string(action
) : "<unknown>");
630 HASHMAP_FOREACH(worker
, manager
->workers
, i
) {
631 if (worker
->state
!= WORKER_IDLE
)
634 r
= device_monitor_send_device(manager
->monitor
, worker
->monitor
, event
->dev
);
636 log_device_error_errno(event
->dev
, r
, "Worker ["PID_FMT
"] did not accept message, killing the worker: %m",
638 (void) kill(worker
->pid
, SIGKILL
);
639 worker
->state
= WORKER_KILLED
;
642 worker_attach_event(worker
, event
);
646 if (hashmap_size(manager
->workers
) >= arg_children_max
) {
648 /* Avoid spamming the debug logs if the limit is already reached and
649 * many events still need to be processed */
650 if (log_children_max_reached
&& arg_children_max
> 1) {
651 log_debug("Maximum number (%u) of children reached.", hashmap_size(manager
->workers
));
652 log_children_max_reached
= false;
657 /* Re-enable the debug message for the next batch of events */
658 log_children_max_reached
= true;
660 /* start new worker and pass initial device */
661 worker_spawn(manager
, event
);
664 static int event_queue_insert(Manager
*manager
, sd_device
*dev
) {
665 _cleanup_(sd_device_unrefp
) sd_device
*clone
= NULL
;
674 /* only one process can add events to the queue */
675 assert(manager
->pid
== getpid_cached());
677 /* We only accepts devices received by device monitor. */
678 r
= device_get_seqnum(dev
, &seqnum
);
682 /* Refuse devices do not have ACTION property. */
683 r
= device_get_action(dev
, &action
);
687 /* Save original device to restore the state on failures. */
688 r
= device_shallow_clone(dev
, &clone
);
692 r
= device_copy_properties(clone
, dev
);
696 event
= new(struct event
, 1);
700 *event
= (struct event
) {
702 .dev
= sd_device_ref(dev
),
703 .dev_kernel
= TAKE_PTR(clone
),
705 .state
= EVENT_QUEUED
,
708 if (LIST_IS_EMPTY(manager
->events
)) {
709 r
= touch("/run/udev/queue");
711 log_warning_errno(r
, "Failed to touch /run/udev/queue: %m");
714 LIST_APPEND(event
, manager
->events
, event
);
716 log_device_debug(dev
, "Device (SEQNUM=%"PRIu64
", ACTION=%s) is queued",
717 seqnum
, device_action_to_string(action
));
722 static void manager_kill_workers(Manager
*manager
) {
723 struct worker
*worker
;
728 HASHMAP_FOREACH(worker
, manager
->workers
, i
) {
729 if (worker
->state
== WORKER_KILLED
)
732 worker
->state
= WORKER_KILLED
;
733 (void) kill(worker
->pid
, SIGTERM
);
737 /* lookup event for identical, parent, child device */
738 static int is_device_busy(Manager
*manager
, struct event
*event
) {
739 const char *subsystem
, *devpath
, *devpath_old
= NULL
;
740 dev_t devnum
= makedev(0, 0);
741 struct event
*loop_event
;
746 r
= sd_device_get_subsystem(event
->dev
, &subsystem
);
750 is_block
= streq(subsystem
, "block");
752 r
= sd_device_get_devpath(event
->dev
, &devpath
);
756 devpath_len
= strlen(devpath
);
758 r
= sd_device_get_property_value(event
->dev
, "DEVPATH_OLD", &devpath_old
);
759 if (r
< 0 && r
!= -ENOENT
)
762 r
= sd_device_get_devnum(event
->dev
, &devnum
);
763 if (r
< 0 && r
!= -ENOENT
)
766 r
= sd_device_get_ifindex(event
->dev
, &ifindex
);
767 if (r
< 0 && r
!= -ENOENT
)
770 /* check if queue contains events we depend on */
771 LIST_FOREACH(event
, loop_event
, manager
->events
) {
772 size_t loop_devpath_len
, common
;
773 const char *loop_devpath
;
775 /* we already found a later event, earlier cannot block us, no need to check again */
776 if (loop_event
->seqnum
< event
->delaying_seqnum
)
779 /* event we checked earlier still exists, no need to check again */
780 if (loop_event
->seqnum
== event
->delaying_seqnum
)
783 /* found ourself, no later event can block us */
784 if (loop_event
->seqnum
>= event
->seqnum
)
787 /* check major/minor */
788 if (major(devnum
) != 0) {
792 if (sd_device_get_subsystem(loop_event
->dev
, &s
) < 0)
795 if (sd_device_get_devnum(loop_event
->dev
, &d
) >= 0 &&
796 devnum
== d
&& is_block
== streq(s
, "block"))
797 goto set_delaying_seqnum
;
800 /* check network device ifindex */
804 if (sd_device_get_ifindex(loop_event
->dev
, &i
) >= 0 &&
806 goto set_delaying_seqnum
;
809 if (sd_device_get_devpath(loop_event
->dev
, &loop_devpath
) < 0)
812 /* check our old name */
813 if (devpath_old
&& streq(devpath_old
, loop_devpath
))
814 goto set_delaying_seqnum
;
816 loop_devpath_len
= strlen(loop_devpath
);
818 /* compare devpath */
819 common
= MIN(devpath_len
, loop_devpath_len
);
821 /* one devpath is contained in the other? */
822 if (!strneq(devpath
, loop_devpath
, common
))
825 /* identical device event found */
826 if (devpath_len
== loop_devpath_len
)
827 goto set_delaying_seqnum
;
829 /* parent device event found */
830 if (devpath
[common
] == '/')
831 goto set_delaying_seqnum
;
833 /* child device event found */
834 if (loop_devpath
[common
] == '/')
835 goto set_delaying_seqnum
;
841 log_device_debug(event
->dev
, "SEQNUM=%" PRIu64
" blocked by SEQNUM=%" PRIu64
,
842 event
->seqnum
, loop_event
->seqnum
);
844 event
->delaying_seqnum
= loop_event
->seqnum
;
848 static void manager_exit(Manager
*manager
) {
851 manager
->exit
= true;
855 "STATUS=Starting shutdown...");
857 /* close sources of new events and discard buffered events */
858 manager
->ctrl
= udev_ctrl_unref(manager
->ctrl
);
860 manager
->inotify_event
= sd_event_source_unref(manager
->inotify_event
);
861 manager
->fd_inotify
= safe_close(manager
->fd_inotify
);
863 manager
->monitor
= sd_device_monitor_unref(manager
->monitor
);
865 /* discard queued events and kill workers */
866 event_queue_cleanup(manager
, EVENT_QUEUED
);
867 manager_kill_workers(manager
);
870 /* reload requested, HUP signal received, rules changed, builtin changed */
871 static void manager_reload(Manager
*manager
) {
877 "STATUS=Flushing configuration...");
879 manager_kill_workers(manager
);
880 manager
->rules
= udev_rules_free(manager
->rules
);
885 "STATUS=Processing with %u children at max", arg_children_max
);
888 static int on_kill_workers_event(sd_event_source
*s
, uint64_t usec
, void *userdata
) {
889 Manager
*manager
= userdata
;
893 log_debug("Cleanup idle workers");
894 manager_kill_workers(manager
);
899 static void event_queue_start(Manager
*manager
) {
906 if (LIST_IS_EMPTY(manager
->events
) ||
907 manager
->exit
|| manager
->stop_exec_queue
)
910 assert_se(sd_event_now(manager
->event
, CLOCK_MONOTONIC
, &usec
) >= 0);
911 /* check for changed config, every 3 seconds at most */
912 if (manager
->last_usec
== 0 ||
913 usec
- manager
->last_usec
> 3 * USEC_PER_SEC
) {
914 if (udev_rules_check_timestamp(manager
->rules
) ||
915 udev_builtin_validate())
916 manager_reload(manager
);
918 manager
->last_usec
= usec
;
921 r
= event_source_disable(manager
->kill_workers_event
);
923 log_warning_errno(r
, "Failed to disable event source for cleaning up idle workers, ignoring: %m");
927 if (!manager
->rules
) {
928 r
= udev_rules_new(&manager
->rules
, arg_resolve_name_timing
);
930 log_warning_errno(r
, "Failed to read udev rules: %m");
935 LIST_FOREACH(event
, event
, manager
->events
) {
936 if (event
->state
!= EVENT_QUEUED
)
939 /* do not start event if parent or child event is still running */
940 if (is_device_busy(manager
, event
) != 0)
943 event_run(manager
, event
);
947 static void event_queue_cleanup(Manager
*manager
, enum event_state match_type
) {
948 struct event
*event
, *tmp
;
950 LIST_FOREACH_SAFE(event
, event
, tmp
, manager
->events
) {
951 if (match_type
!= EVENT_UNDEF
&& match_type
!= event
->state
)
958 static int on_worker(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
959 Manager
*manager
= userdata
;
964 struct worker_message msg
;
965 struct iovec iovec
= {
967 .iov_len
= sizeof(msg
),
969 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred
))) control
;
970 struct msghdr msghdr
= {
973 .msg_control
= &control
,
974 .msg_controllen
= sizeof(control
),
978 struct worker
*worker
;
980 size
= recvmsg_safe(fd
, &msghdr
, MSG_DONTWAIT
);
984 /* nothing more to read */
987 return log_error_errno(size
, "Failed to receive message: %m");
989 cmsg_close_all(&msghdr
);
991 if (size
!= sizeof(struct worker_message
)) {
992 log_warning("Ignoring worker message with invalid size %zi bytes", size
);
996 ucred
= CMSG_FIND_DATA(&msghdr
, SOL_SOCKET
, SCM_CREDENTIALS
, struct ucred
);
997 if (!ucred
|| ucred
->pid
<= 0) {
998 log_warning("Ignoring worker message without valid PID");
1002 /* lookup worker who sent the signal */
1003 worker
= hashmap_get(manager
->workers
, PID_TO_PTR(ucred
->pid
));
1005 log_debug("Worker ["PID_FMT
"] returned, but is no longer tracked", ucred
->pid
);
1009 if (worker
->state
!= WORKER_KILLED
)
1010 worker
->state
= WORKER_IDLE
;
1012 /* worker returned */
1013 event_free(worker
->event
);
1016 /* we have free workers, try to schedule events */
1017 event_queue_start(manager
);
1022 static int on_uevent(sd_device_monitor
*monitor
, sd_device
*dev
, void *userdata
) {
1023 Manager
*manager
= userdata
;
1028 device_ensure_usec_initialized(dev
, NULL
);
1030 r
= event_queue_insert(manager
, dev
);
1032 log_device_error_errno(dev
, r
, "Failed to insert device into event queue: %m");
1036 /* we have fresh events, try to schedule them */
1037 event_queue_start(manager
);
1042 /* receive the udevd message from userspace */
1043 static int on_ctrl_msg(struct udev_ctrl
*uctrl
, enum udev_ctrl_msg_type type
, const union udev_ctrl_msg_value
*value
, void *userdata
) {
1044 Manager
*manager
= userdata
;
1051 case UDEV_CTRL_SET_LOG_LEVEL
:
1052 log_debug("Received udev control message (SET_LOG_LEVEL), setting log_priority=%i", value
->intval
);
1053 log_set_max_level_realm(LOG_REALM_UDEV
, value
->intval
);
1054 log_set_max_level_realm(LOG_REALM_SYSTEMD
, value
->intval
);
1055 manager_kill_workers(manager
);
1057 case UDEV_CTRL_STOP_EXEC_QUEUE
:
1058 log_debug("Received udev control message (STOP_EXEC_QUEUE)");
1059 manager
->stop_exec_queue
= true;
1061 case UDEV_CTRL_START_EXEC_QUEUE
:
1062 log_debug("Received udev control message (START_EXEC_QUEUE)");
1063 manager
->stop_exec_queue
= false;
1064 event_queue_start(manager
);
1066 case UDEV_CTRL_RELOAD
:
1067 log_debug("Received udev control message (RELOAD)");
1068 manager_reload(manager
);
1070 case UDEV_CTRL_SET_ENV
: {
1071 _cleanup_free_
char *key
= NULL
, *val
= NULL
, *old_key
= NULL
, *old_val
= NULL
;
1074 eq
= strchr(value
->buf
, '=');
1076 log_error("Invalid key format '%s'", value
->buf
);
1080 key
= strndup(value
->buf
, eq
- value
->buf
);
1086 old_val
= hashmap_remove2(manager
->properties
, key
, (void **) &old_key
);
1088 r
= hashmap_ensure_allocated(&manager
->properties
, &string_hash_ops
);
1096 log_debug("Received udev control message (ENV), unsetting '%s'", key
);
1098 r
= hashmap_put(manager
->properties
, key
, NULL
);
1110 log_debug("Received udev control message (ENV), setting '%s=%s'", key
, val
);
1112 r
= hashmap_put(manager
->properties
, key
, val
);
1120 manager_kill_workers(manager
);
1123 case UDEV_CTRL_SET_CHILDREN_MAX
:
1124 if (value
->intval
<= 0) {
1125 log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value
->intval
);
1129 log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value
->intval
);
1130 arg_children_max
= value
->intval
;
1132 (void) sd_notifyf(false,
1134 "STATUS=Processing with %u children at max", arg_children_max
);
1136 case UDEV_CTRL_PING
:
1137 log_debug("Received udev control message (PING)");
1139 case UDEV_CTRL_EXIT
:
1140 log_debug("Received udev control message (EXIT)");
1141 manager_exit(manager
);
1144 log_debug("Received unknown udev control message, ignoring");
1150 static int synthesize_change_one(sd_device
*dev
, const char *syspath
) {
1151 const char *filename
;
1154 filename
= strjoina(syspath
, "/uevent");
1155 log_device_debug(dev
, "device is closed, synthesising 'change' on %s", syspath
);
1156 r
= write_string_file(filename
, "change", WRITE_STRING_FILE_DISABLE_BUFFER
);
1158 return log_device_debug_errno(dev
, r
, "Failed to write 'change' to %s: %m", filename
);
1162 static int synthesize_change(sd_device
*dev
) {
1163 const char *subsystem
, *sysname
, *devname
, *syspath
, *devtype
;
1166 r
= sd_device_get_subsystem(dev
, &subsystem
);
1170 r
= sd_device_get_sysname(dev
, &sysname
);
1174 r
= sd_device_get_devname(dev
, &devname
);
1178 r
= sd_device_get_syspath(dev
, &syspath
);
1182 r
= sd_device_get_devtype(dev
, &devtype
);
1186 if (streq_ptr("block", subsystem
) &&
1187 streq_ptr("disk", devtype
) &&
1188 !startswith(sysname
, "dm-")) {
1189 _cleanup_(sd_device_enumerator_unrefp
) sd_device_enumerator
*e
= NULL
;
1190 bool part_table_read
= false, has_partitions
= false;
1195 * Try to re-read the partition table. This only succeeds if
1196 * none of the devices is busy. The kernel returns 0 if no
1197 * partition table is found, and we will not get an event for
1200 fd
= open(devname
, O_RDONLY
|O_CLOEXEC
|O_NOFOLLOW
|O_NONBLOCK
);
1202 r
= flock(fd
, LOCK_EX
|LOCK_NB
);
1204 r
= ioctl(fd
, BLKRRPART
, 0);
1208 part_table_read
= true;
1211 /* search for partitions */
1212 r
= sd_device_enumerator_new(&e
);
1216 r
= sd_device_enumerator_allow_uninitialized(e
);
1220 r
= sd_device_enumerator_add_match_parent(e
, dev
);
1224 r
= sd_device_enumerator_add_match_subsystem(e
, "block", true);
1228 FOREACH_DEVICE(e
, d
) {
1231 if (sd_device_get_devtype(d
, &t
) < 0 ||
1232 !streq("partition", t
))
1235 has_partitions
= true;
1240 * We have partitions and re-read the table, the kernel already sent
1241 * out a "change" event for the disk, and "remove/add" for all
1244 if (part_table_read
&& has_partitions
)
1248 * We have partitions but re-reading the partition table did not
1249 * work, synthesize "change" for the disk and all partitions.
1251 (void) synthesize_change_one(dev
, syspath
);
1253 FOREACH_DEVICE(e
, d
) {
1254 const char *t
, *n
, *s
;
1256 if (sd_device_get_devtype(d
, &t
) < 0 ||
1257 !streq("partition", t
))
1260 if (sd_device_get_devname(d
, &n
) < 0 ||
1261 sd_device_get_syspath(d
, &s
) < 0)
1264 (void) synthesize_change_one(dev
, s
);
1268 (void) synthesize_change_one(dev
, syspath
);
1273 static int on_inotify(sd_event_source
*s
, int fd
, uint32_t revents
, void *userdata
) {
1274 Manager
*manager
= userdata
;
1275 union inotify_event_buffer buffer
;
1276 struct inotify_event
*e
;
1282 r
= event_source_disable(manager
->kill_workers_event
);
1284 log_warning_errno(r
, "Failed to disable event source for cleaning up idle workers, ignoring: %m");
1286 l
= read(fd
, &buffer
, sizeof(buffer
));
1288 if (IN_SET(errno
, EAGAIN
, EINTR
))
1291 return log_error_errno(errno
, "Failed to read inotify fd: %m");
1294 FOREACH_INOTIFY_EVENT(e
, buffer
, l
) {
1295 _cleanup_(sd_device_unrefp
) sd_device
*dev
= NULL
;
1296 const char *devnode
;
1298 if (udev_watch_lookup(e
->wd
, &dev
) <= 0)
1301 if (sd_device_get_devname(dev
, &devnode
) < 0)
1304 log_device_debug(dev
, "Inotify event: %x for %s", e
->mask
, devnode
);
1305 if (e
->mask
& IN_CLOSE_WRITE
)
1306 synthesize_change(dev
);
1307 else if (e
->mask
& IN_IGNORED
)
1308 udev_watch_end(dev
);
1314 static int on_sigterm(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
1315 Manager
*manager
= userdata
;
1319 manager_exit(manager
);
1324 static int on_sighup(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
1325 Manager
*manager
= userdata
;
1329 manager_reload(manager
);
1334 static int on_sigchld(sd_event_source
*s
, const struct signalfd_siginfo
*si
, void *userdata
) {
1335 Manager
*manager
= userdata
;
1343 struct worker
*worker
;
1345 pid
= waitpid(-1, &status
, WNOHANG
);
1349 worker
= hashmap_get(manager
->workers
, PID_TO_PTR(pid
));
1351 log_warning("Worker ["PID_FMT
"] is unknown, ignoring", pid
);
1355 if (WIFEXITED(status
)) {
1356 if (WEXITSTATUS(status
) == 0)
1357 log_debug("Worker ["PID_FMT
"] exited", pid
);
1359 log_warning("Worker ["PID_FMT
"] exited with return code %i", pid
, WEXITSTATUS(status
));
1360 } else if (WIFSIGNALED(status
))
1361 log_warning("Worker ["PID_FMT
"] terminated by signal %i (%s)", pid
, WTERMSIG(status
), signal_to_string(WTERMSIG(status
)));
1362 else if (WIFSTOPPED(status
)) {
1363 log_info("Worker ["PID_FMT
"] stopped", pid
);
1365 } else if (WIFCONTINUED(status
)) {
1366 log_info("Worker ["PID_FMT
"] continued", pid
);
1369 log_warning("Worker ["PID_FMT
"] exit with status 0x%04x", pid
, status
);
1371 if ((!WIFEXITED(status
) || WEXITSTATUS(status
) != 0) && worker
->event
) {
1372 log_device_error(worker
->event
->dev
, "Worker ["PID_FMT
"] failed", pid
);
1374 /* delete state from disk */
1375 device_delete_db(worker
->event
->dev
);
1376 device_tag_index(worker
->event
->dev
, NULL
, false);
1378 if (manager
->monitor
) {
1379 /* forward kernel event without amending it */
1380 r
= device_monitor_send_device(manager
->monitor
, NULL
, worker
->event
->dev_kernel
);
1382 log_device_error_errno(worker
->event
->dev_kernel
, r
, "Failed to send back device to kernel: %m");
1386 worker_free(worker
);
1389 /* we can start new workers, try to schedule events */
1390 event_queue_start(manager
);
1392 /* Disable unnecessary cleanup event */
1393 if (hashmap_isempty(manager
->workers
)) {
1394 r
= event_source_disable(manager
->kill_workers_event
);
1396 log_warning_errno(r
, "Failed to disable event source for cleaning up idle workers, ignoring: %m");
1402 static int on_post(sd_event_source
*s
, void *userdata
) {
1403 Manager
*manager
= userdata
;
1407 if (!LIST_IS_EMPTY(manager
->events
))
1410 /* There are no pending events. Let's cleanup idle process. */
1412 if (!hashmap_isempty(manager
->workers
)) {
1413 /* There are idle workers */
1414 (void) event_reset_time(manager
->event
, &manager
->kill_workers_event
, CLOCK_MONOTONIC
,
1415 now(CLOCK_MONOTONIC
) + 3 * USEC_PER_SEC
, USEC_PER_SEC
,
1416 on_kill_workers_event
, manager
, 0, "kill-workers-event", false);
1420 /* There are no idle workers. */
1423 return sd_event_exit(manager
->event
, 0);
1425 if (manager
->cgroup
)
1426 /* cleanup possible left-over processes in our cgroup */
1427 (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER
, manager
->cgroup
, SIGKILL
, CGROUP_IGNORE_SELF
, NULL
, NULL
, NULL
);
1432 static int listen_fds(int *ret_ctrl
, int *ret_netlink
) {
1433 int ctrl_fd
= -1, netlink_fd
= -1;
1437 assert(ret_netlink
);
1439 n
= sd_listen_fds(true);
1443 for (fd
= SD_LISTEN_FDS_START
; fd
< n
+ SD_LISTEN_FDS_START
; fd
++) {
1444 if (sd_is_socket(fd
, AF_LOCAL
, SOCK_SEQPACKET
, -1) > 0) {
1451 if (sd_is_socket(fd
, AF_NETLINK
, SOCK_RAW
, -1) > 0) {
1452 if (netlink_fd
>= 0)
1461 *ret_ctrl
= ctrl_fd
;
1462 *ret_netlink
= netlink_fd
;
1468 * read the kernel command line, in case we need to get into debug mode
1469 * udev.log_priority=<level> syslog priority
1470 * udev.children_max=<number of workers> events are fully serialized if set to 1
1471 * udev.exec_delay=<number of seconds> delay execution of every executed program
1472 * udev.event_timeout=<number of seconds> seconds to wait before terminating an event
1473 * udev.blockdev_read_only<=bool> mark all block devices read-only when they appear
1475 static int parse_proc_cmdline_item(const char *key
, const char *value
, void *data
) {
1480 if (proc_cmdline_key_streq(key
, "udev.log_priority")) {
1482 if (proc_cmdline_value_missing(key
, value
))
1485 r
= log_level_from_string(value
);
1487 log_set_max_level(r
);
1489 } else if (proc_cmdline_key_streq(key
, "udev.event_timeout")) {
1491 if (proc_cmdline_value_missing(key
, value
))
1494 r
= parse_sec(value
, &arg_event_timeout_usec
);
1496 } else if (proc_cmdline_key_streq(key
, "udev.children_max")) {
1498 if (proc_cmdline_value_missing(key
, value
))
1501 r
= safe_atou(value
, &arg_children_max
);
1503 } else if (proc_cmdline_key_streq(key
, "udev.exec_delay")) {
1505 if (proc_cmdline_value_missing(key
, value
))
1508 r
= parse_sec(value
, &arg_exec_delay_usec
);
1510 } else if (proc_cmdline_key_streq(key
, "udev.timeout_signal")) {
1512 if (proc_cmdline_value_missing(key
, value
))
1515 r
= signal_from_string(value
);
1517 arg_timeout_signal
= r
;
1519 } else if (proc_cmdline_key_streq(key
, "udev.blockdev_read_only")) {
1522 arg_blockdev_read_only
= true;
1524 r
= parse_boolean(value
);
1526 log_warning_errno(r
, "Failed to parse udev.blockdev-read-only argument, ignoring: %s", value
);
1528 arg_blockdev_read_only
= r
;
1531 if (arg_blockdev_read_only
)
1532 log_notice("All physical block devices will be marked read-only.");
1537 if (startswith(key
, "udev."))
1538 log_warning("Unknown udev kernel command line option \"%s\", ignoring.", key
);
1544 log_warning_errno(r
, "Failed to parse \"%s=%s\", ignoring: %m", key
, value
);
1549 static int help(void) {
1550 _cleanup_free_
char *link
= NULL
;
1553 r
= terminal_urlify_man("systemd-udevd.service", "8", &link
);
1557 printf("%s [OPTIONS...]\n\n"
1558 "Rule-based manager for device events and files.\n\n"
1559 " -h --help Print this message\n"
1560 " -V --version Print version of the program\n"
1561 " -d --daemon Detach and run in the background\n"
1562 " -D --debug Enable debug output\n"
1563 " -c --children-max=INT Set maximum number of workers\n"
1564 " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n"
1565 " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n"
1566 " -N --resolve-names=early|late|never\n"
1567 " When to resolve users and groups\n"
1568 "\nSee the %s for details.\n"
1569 , program_invocation_short_name
1576 static int parse_argv(int argc
, char *argv
[]) {
1581 static const struct option options
[] = {
1582 { "daemon", no_argument
, NULL
, 'd' },
1583 { "debug", no_argument
, NULL
, 'D' },
1584 { "children-max", required_argument
, NULL
, 'c' },
1585 { "exec-delay", required_argument
, NULL
, 'e' },
1586 { "event-timeout", required_argument
, NULL
, 't' },
1587 { "resolve-names", required_argument
, NULL
, 'N' },
1588 { "help", no_argument
, NULL
, 'h' },
1589 { "version", no_argument
, NULL
, 'V' },
1590 { "timeout-signal", required_argument
, NULL
, ARG_TIMEOUT_SIGNAL
},
1599 while ((c
= getopt_long(argc
, argv
, "c:de:Dt:N:hV", options
, NULL
)) >= 0) {
1603 arg_daemonize
= true;
1606 r
= safe_atou(optarg
, &arg_children_max
);
1608 log_warning_errno(r
, "Failed to parse --children-max= value '%s', ignoring: %m", optarg
);
1611 r
= parse_sec(optarg
, &arg_exec_delay_usec
);
1613 log_warning_errno(r
, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg
);
1615 case ARG_TIMEOUT_SIGNAL
:
1616 r
= signal_from_string(optarg
);
1618 log_warning_errno(r
, "Failed to parse --timeout-signal= value '%s', ignoring: %m", optarg
);
1620 arg_timeout_signal
= r
;
1624 r
= parse_sec(optarg
, &arg_event_timeout_usec
);
1626 log_warning_errno(r
, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg
);
1632 ResolveNameTiming t
;
1634 t
= resolve_name_timing_from_string(optarg
);
1636 log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg
);
1638 arg_resolve_name_timing
= t
;
1644 printf("%s\n", GIT_VERSION
);
1649 assert_not_reached("Unhandled option");
1657 static int manager_new(Manager
**ret
, int fd_ctrl
, int fd_uevent
, const char *cgroup
) {
1658 _cleanup_(manager_freep
) Manager
*manager
= NULL
;
1663 manager
= new(Manager
, 1);
1667 *manager
= (Manager
) {
1669 .worker_watch
= { -1, -1 },
1673 r
= udev_ctrl_new_from_fd(&manager
->ctrl
, fd_ctrl
);
1675 return log_error_errno(r
, "Failed to initialize udev control socket: %m");
1677 r
= udev_ctrl_enable_receiving(manager
->ctrl
);
1679 return log_error_errno(r
, "Failed to bind udev control socket: %m");
1681 r
= device_monitor_new_full(&manager
->monitor
, MONITOR_GROUP_KERNEL
, fd_uevent
);
1683 return log_error_errno(r
, "Failed to initialize device monitor: %m");
1685 /* Bump receiver buffer, but only if we are not called via socket activation, as in that
1686 * case systemd sets the receive buffer size for us, and the value in the .socket unit
1687 * should take full effect. */
1689 (void) sd_device_monitor_set_receive_buffer_size(manager
->monitor
, 128 * 1024 * 1024);
1691 r
= device_monitor_enable_receiving(manager
->monitor
);
1693 return log_error_errno(r
, "Failed to bind netlink socket: %m");
1695 *ret
= TAKE_PTR(manager
);
1700 static int main_loop(Manager
*manager
) {
1703 manager
->pid
= getpid_cached();
1705 /* unnamed socket from workers to the main daemon */
1706 r
= socketpair(AF_LOCAL
, SOCK_DGRAM
|SOCK_CLOEXEC
, 0, manager
->worker_watch
);
1708 return log_error_errno(errno
, "Failed to create socketpair for communicating with workers: %m");
1710 fd_worker
= manager
->worker_watch
[READ_END
];
1712 r
= setsockopt_int(fd_worker
, SOL_SOCKET
, SO_PASSCRED
, true);
1714 return log_error_errno(r
, "Failed to enable SO_PASSCRED: %m");
1716 r
= udev_watch_init();
1718 return log_error_errno(r
, "Failed to create inotify descriptor: %m");
1719 manager
->fd_inotify
= r
;
1721 udev_watch_restore();
1723 /* block and listen to all signals on signalfd */
1724 assert_se(sigprocmask_many(SIG_BLOCK
, NULL
, SIGTERM
, SIGINT
, SIGHUP
, SIGCHLD
, -1) >= 0);
1726 r
= sd_event_default(&manager
->event
);
1728 return log_error_errno(r
, "Failed to allocate event loop: %m");
1730 r
= sd_event_add_signal(manager
->event
, NULL
, SIGINT
, on_sigterm
, manager
);
1732 return log_error_errno(r
, "Failed to create SIGINT event source: %m");
1734 r
= sd_event_add_signal(manager
->event
, NULL
, SIGTERM
, on_sigterm
, manager
);
1736 return log_error_errno(r
, "Failed to create SIGTERM event source: %m");
1738 r
= sd_event_add_signal(manager
->event
, NULL
, SIGHUP
, on_sighup
, manager
);
1740 return log_error_errno(r
, "Failed to create SIGHUP event source: %m");
1742 r
= sd_event_add_signal(manager
->event
, NULL
, SIGCHLD
, on_sigchld
, manager
);
1744 return log_error_errno(r
, "Failed to create SIGCHLD event source: %m");
1746 r
= sd_event_set_watchdog(manager
->event
, true);
1748 return log_error_errno(r
, "Failed to create watchdog event source: %m");
1750 r
= udev_ctrl_attach_event(manager
->ctrl
, manager
->event
);
1752 return log_error_errno(r
, "Failed to attach event to udev control: %m");
1754 r
= udev_ctrl_start(manager
->ctrl
, on_ctrl_msg
, manager
);
1756 return log_error_errno(r
, "Failed to start device monitor: %m");
1758 /* This needs to be after the inotify and uevent handling, to make sure
1759 * that the ping is send back after fully processing the pending uevents
1760 * (including the synthetic ones we may create due to inotify events).
1762 r
= sd_event_source_set_priority(udev_ctrl_get_event_source(manager
->ctrl
), SD_EVENT_PRIORITY_IDLE
);
1764 return log_error_errno(r
, "Failed to set IDLE event priority for udev control event source: %m");
1766 r
= sd_event_add_io(manager
->event
, &manager
->inotify_event
, manager
->fd_inotify
, EPOLLIN
, on_inotify
, manager
);
1768 return log_error_errno(r
, "Failed to create inotify event source: %m");
1770 r
= sd_device_monitor_attach_event(manager
->monitor
, manager
->event
);
1772 return log_error_errno(r
, "Failed to attach event to device monitor: %m");
1774 r
= sd_device_monitor_start(manager
->monitor
, on_uevent
, manager
);
1776 return log_error_errno(r
, "Failed to start device monitor: %m");
1778 (void) sd_event_source_set_description(sd_device_monitor_get_event_source(manager
->monitor
), "device-monitor");
1780 r
= sd_event_add_io(manager
->event
, NULL
, fd_worker
, EPOLLIN
, on_worker
, manager
);
1782 return log_error_errno(r
, "Failed to create worker event source: %m");
1784 r
= sd_event_add_post(manager
->event
, NULL
, on_post
, manager
);
1786 return log_error_errno(r
, "Failed to create post event source: %m");
1788 udev_builtin_init();
1790 r
= udev_rules_new(&manager
->rules
, arg_resolve_name_timing
);
1791 if (!manager
->rules
)
1792 return log_error_errno(r
, "Failed to read udev rules: %m");
1794 r
= udev_rules_apply_static_dev_perms(manager
->rules
);
1796 log_error_errno(r
, "Failed to apply permissions on static device nodes: %m");
1798 (void) sd_notifyf(false,
1800 "STATUS=Processing with %u children at max", arg_children_max
);
1802 r
= sd_event_loop(manager
->event
);
1804 log_error_errno(r
, "Event loop failed: %m");
1808 "STATUS=Shutting down...");
1812 int run_udevd(int argc
, char *argv
[]) {
1813 _cleanup_free_
char *cgroup
= NULL
;
1814 _cleanup_(manager_freep
) Manager
*manager
= NULL
;
1815 int fd_ctrl
= -1, fd_uevent
= -1;
1818 log_set_target(LOG_TARGET_AUTO
);
1820 udev_parse_config_full(&arg_children_max
, &arg_exec_delay_usec
, &arg_event_timeout_usec
, &arg_resolve_name_timing
, &arg_timeout_signal
);
1821 log_parse_environment();
1822 log_open(); /* Done again to update after reading configuration. */
1824 r
= parse_argv(argc
, argv
);
1828 r
= proc_cmdline_parse(parse_proc_cmdline_item
, NULL
, PROC_CMDLINE_STRIP_RD_PREFIX
);
1830 log_warning_errno(r
, "Failed to parse kernel command line, ignoring: %m");
1833 log_set_target(LOG_TARGET_CONSOLE
);
1834 log_set_max_level(LOG_DEBUG
);
1837 log_set_max_level_realm(LOG_REALM_SYSTEMD
, log_get_max_level());
1843 if (arg_children_max
== 0) {
1844 unsigned long cpu_limit
, mem_limit
, cpu_count
= 1;
1846 r
= cpus_in_affinity_mask();
1848 log_warning_errno(r
, "Failed to determine number of local CPUs, ignoring: %m");
1852 cpu_limit
= cpu_count
* 2 + 16;
1853 mem_limit
= MAX(physical_memory() / (128UL*1024*1024), 10U);
1855 arg_children_max
= MIN(cpu_limit
, mem_limit
);
1856 arg_children_max
= MIN(WORKER_NUM_MAX
, arg_children_max
);
1858 log_debug("Set children_max to %u", arg_children_max
);
1861 /* set umask before creating any file/directory */
1864 return log_error_errno(errno
, "Failed to change dir to '/': %m");
1868 r
= mac_selinux_init();
1870 return log_error_errno(r
, "Could not initialize labelling: %m");
1872 r
= mkdir_errno_wrapper("/run/udev", 0755);
1873 if (r
< 0 && r
!= -EEXIST
)
1874 return log_error_errno(r
, "Failed to create /run/udev: %m");
1876 dev_setup(NULL
, UID_INVALID
, GID_INVALID
);
1878 if (getppid() == 1 && sd_booted() > 0) {
1879 /* Get our own cgroup, we regularly kill everything udev has left behind.
1880 * We only do this on systemd systems, and only if we are directly spawned
1881 * by PID1. Otherwise we are not guaranteed to have a dedicated cgroup. */
1882 r
= cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER
, 0, &cgroup
);
1884 if (IN_SET(r
, -ENOENT
, -ENOMEDIUM
))
1885 log_debug_errno(r
, "Dedicated cgroup not found: %m");
1887 log_warning_errno(r
, "Failed to get cgroup: %m");
1891 r
= listen_fds(&fd_ctrl
, &fd_uevent
);
1893 return log_error_errno(r
, "Failed to listen on fds: %m");
1895 r
= manager_new(&manager
, fd_ctrl
, fd_uevent
, cgroup
);
1897 return log_error_errno(r
, "Failed to create manager: %m");
1899 if (arg_daemonize
) {
1902 log_info("Starting version " GIT_VERSION
);
1904 /* connect /dev/null to stdin, stdout, stderr */
1905 if (log_get_max_level() < LOG_DEBUG
) {
1906 r
= make_null_stdio();
1908 log_warning_errno(r
, "Failed to redirect standard streams to /dev/null: %m");
1913 return log_error_errno(errno
, "Failed to fork daemon: %m");
1921 r
= set_oom_score_adjust(-1000);
1923 log_debug_errno(r
, "Failed to adjust OOM score, ignoring: %m");
1926 return main_loop(manager
);