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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
***/
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/inotify.h>
#include <unistd.h>
#include "libudev.h"
#include "alloc-util.h"
#include "fd-util.h"
#include "io-util.h"
/**
* SECTION:libudev-queue
* @short_description: access to currently active events
*
* This exports the current state of the udev processing queue.
*/
/**
* udev_queue:
*
* Opaque object representing the current event queue in the udev daemon.
*/
struct udev_queue {
struct udev *udev;
unsigned n_ref;
int fd;
};
/**
* udev_queue_new:
* @udev: udev library context
*
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev queue context.
*
* Returns: the udev queue context, or #NULL on error.
**/
_public_ struct udev_queue *udev_queue_new(struct udev *udev) {
struct udev_queue *udev_queue;
udev_queue = new(struct udev_queue, 1);
if (!udev_queue)
return_with_errno(NULL, ENOMEM);
*udev_queue = (struct udev_queue) {
.udev = udev,
.n_ref = 1,
.fd = -1,
};
return udev_queue;
}
static struct udev_queue *udev_queue_free(struct udev_queue *udev_queue) {
assert(udev_queue);
safe_close(udev_queue->fd);
return mfree(udev_queue);
}
/**
* udev_queue_ref:
* @udev_queue: udev queue context
*
* Take a reference of a udev queue context.
*
* Returns: the same udev queue context.
**/
/**
* udev_queue_unref:
* @udev_queue: udev queue context
*
* Drop a reference of a udev queue context. If the refcount reaches zero,
* the resources of the queue context will be released.
*
* Returns: #NULL
**/
DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(struct udev_queue, udev_queue, udev_queue_free);
/**
* udev_queue_get_udev:
* @udev_queue: udev queue context
*
* Retrieve the udev library context the queue context was created with.
*
* Returns: the udev library context.
**/
_public_ struct udev *udev_queue_get_udev(struct udev_queue *udev_queue) {
assert_return_errno(udev_queue, NULL, EINVAL);
return udev_queue->udev;
}
/**
* udev_queue_get_kernel_seqnum:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: 0.
**/
_public_ unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue) {
return 0;
}
/**
* udev_queue_get_udev_seqnum:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: 0.
**/
_public_ unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue) {
return 0;
}
/**
* udev_queue_get_udev_is_active:
* @udev_queue: udev queue context
*
* Check if udev is active on the system.
*
* Returns: a flag indicating if udev is active.
**/
_public_ int udev_queue_get_udev_is_active(struct udev_queue *udev_queue) {
return access("/run/udev/control", F_OK) >= 0;
}
/**
* udev_queue_get_queue_is_empty:
* @udev_queue: udev queue context
*
* Check if udev is currently processing any events.
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue) {
return access("/run/udev/queue", F_OK) < 0;
}
/**
* udev_queue_get_seqnum_sequence_is_finished:
* @udev_queue: udev queue context
* @start: first event sequence number
* @end: last event sequence number
*
* This function is deprecated, it just returns the result of
* udev_queue_get_queue_is_empty().
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
unsigned long long int start, unsigned long long int end) {
return udev_queue_get_queue_is_empty(udev_queue);
}
/**
* udev_queue_get_seqnum_is_finished:
* @udev_queue: udev queue context
* @seqnum: sequence number
*
* This function is deprecated, it just returns the result of
* udev_queue_get_queue_is_empty().
*
* Returns: a flag indicating if udev is currently handling events.
**/
_public_ int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum) {
return udev_queue_get_queue_is_empty(udev_queue);
}
/**
* udev_queue_get_queued_list_entry:
* @udev_queue: udev queue context
*
* This function is deprecated.
*
* Returns: NULL.
**/
_public_ struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue) {
return_with_errno(NULL, ENODATA);
}
/**
* udev_queue_get_fd:
* @udev_queue: udev queue context
*
* Returns: a file descriptor to watch for a queue to become empty.
*/
_public_ int udev_queue_get_fd(struct udev_queue *udev_queue) {
_cleanup_close_ int fd = -1;
assert_return(udev_queue, -EINVAL);
if (udev_queue->fd >= 0)
return udev_queue->fd;
fd = inotify_init1(IN_CLOEXEC);
if (fd < 0)
return -errno;
if (inotify_add_watch(fd, "/run/udev" , IN_DELETE) < 0)
return -errno;
udev_queue->fd = TAKE_FD(fd);
return udev_queue->fd;
}
/**
* udev_queue_flush:
* @udev_queue: udev queue context
*
* Returns: the result of clearing the watch for queue changes.
*/
_public_ int udev_queue_flush(struct udev_queue *udev_queue) {
int r;
assert_return(udev_queue, -EINVAL);
if (udev_queue->fd < 0)
return -EINVAL;
r = flush_fd(udev_queue->fd);
if (r < 0)
return r;
return 0;
}
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