cf0fbc49e6
Sort the includes accoding to the new coding style.
269 lines
6.4 KiB
C
269 lines
6.4 KiB
C
/***
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This file is part of systemd.
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Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
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Copyright 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <sys/inotify.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "io-util.h"
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#include "libudev-private.h"
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/**
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* SECTION:libudev-queue
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* @short_description: access to currently active events
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*
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* This exports the current state of the udev processing queue.
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*/
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/**
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* udev_queue:
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*
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* Opaque object representing the current event queue in the udev daemon.
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*/
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struct udev_queue {
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struct udev *udev;
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int refcount;
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int fd;
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};
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/**
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* udev_queue_new:
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* @udev: udev library context
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*
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* The initial refcount is 1, and needs to be decremented to
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* release the resources of the udev queue context.
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*
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* Returns: the udev queue context, or #NULL on error.
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**/
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_public_ struct udev_queue *udev_queue_new(struct udev *udev)
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{
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struct udev_queue *udev_queue;
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if (udev == NULL)
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return NULL;
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udev_queue = new0(struct udev_queue, 1);
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if (udev_queue == NULL)
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return NULL;
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udev_queue->refcount = 1;
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udev_queue->udev = udev;
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udev_queue->fd = -1;
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return udev_queue;
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}
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/**
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* udev_queue_ref:
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* @udev_queue: udev queue context
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*
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* Take a reference of a udev queue context.
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*
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* Returns: the same udev queue context.
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**/
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_public_ struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue)
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{
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if (udev_queue == NULL)
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return NULL;
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udev_queue->refcount++;
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return udev_queue;
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}
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/**
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* udev_queue_unref:
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* @udev_queue: udev queue context
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*
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* Drop a reference of a udev queue context. If the refcount reaches zero,
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* the resources of the queue context will be released.
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*
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* Returns: #NULL
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**/
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_public_ struct udev_queue *udev_queue_unref(struct udev_queue *udev_queue)
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{
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if (udev_queue == NULL)
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return NULL;
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udev_queue->refcount--;
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if (udev_queue->refcount > 0)
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return NULL;
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safe_close(udev_queue->fd);
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free(udev_queue);
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return NULL;
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}
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/**
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* udev_queue_get_udev:
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* @udev_queue: udev queue context
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*
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* Retrieve the udev library context the queue context was created with.
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*
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* Returns: the udev library context.
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**/
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_public_ struct udev *udev_queue_get_udev(struct udev_queue *udev_queue)
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{
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if (udev_queue == NULL)
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return NULL;
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return udev_queue->udev;
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}
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/**
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* udev_queue_get_kernel_seqnum:
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* @udev_queue: udev queue context
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*
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* This function is deprecated.
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*
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* Returns: 0.
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**/
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_public_ unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue)
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{
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return 0;
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}
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/**
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* udev_queue_get_udev_seqnum:
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* @udev_queue: udev queue context
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*
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* This function is deprecated.
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*
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* Returns: 0.
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**/
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_public_ unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue)
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{
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return 0;
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}
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/**
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* udev_queue_get_udev_is_active:
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* @udev_queue: udev queue context
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*
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* Check if udev is active on the system.
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*
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* Returns: a flag indicating if udev is active.
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**/
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_public_ int udev_queue_get_udev_is_active(struct udev_queue *udev_queue)
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{
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return access("/run/udev/control", F_OK) >= 0;
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}
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/**
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* udev_queue_get_queue_is_empty:
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* @udev_queue: udev queue context
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*
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* Check if udev is currently processing any events.
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*
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* Returns: a flag indicating if udev is currently handling events.
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**/
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_public_ int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue)
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{
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return access("/run/udev/queue", F_OK) < 0;
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}
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/**
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* udev_queue_get_seqnum_sequence_is_finished:
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* @udev_queue: udev queue context
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* @start: first event sequence number
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* @end: last event sequence number
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*
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* This function is deprecated, it just returns the result of
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* udev_queue_get_queue_is_empty().
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*
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* Returns: a flag indicating if udev is currently handling events.
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**/
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_public_ int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue *udev_queue,
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unsigned long long int start, unsigned long long int end)
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{
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return udev_queue_get_queue_is_empty(udev_queue);
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}
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/**
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* udev_queue_get_seqnum_is_finished:
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* @udev_queue: udev queue context
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* @seqnum: sequence number
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*
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* This function is deprecated, it just returns the result of
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* udev_queue_get_queue_is_empty().
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*
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* Returns: a flag indicating if udev is currently handling events.
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**/
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_public_ int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum)
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{
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return udev_queue_get_queue_is_empty(udev_queue);
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}
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/**
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* udev_queue_get_queued_list_entry:
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* @udev_queue: udev queue context
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*
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* This function is deprecated.
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*
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* Returns: NULL.
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**/
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_public_ struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue)
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{
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return NULL;
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}
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/**
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* udev_queue_get_fd:
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* @udev_queue: udev queue context
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*
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* Returns: a file descriptor to watch for a queue to become empty.
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*/
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_public_ int udev_queue_get_fd(struct udev_queue *udev_queue) {
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int fd;
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int r;
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if (udev_queue->fd >= 0)
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return udev_queue->fd;
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fd = inotify_init1(IN_CLOEXEC);
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if (fd < 0)
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return -errno;
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r = inotify_add_watch(fd, "/run/udev" , IN_DELETE);
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if (r < 0) {
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r = -errno;
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close(fd);
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return r;
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}
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udev_queue->fd = fd;
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return fd;
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}
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/**
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* udev_queue_flush:
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* @udev_queue: udev queue context
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*
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* Returns: the result of clearing the watch for queue changes.
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*/
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_public_ int udev_queue_flush(struct udev_queue *udev_queue) {
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if (udev_queue->fd < 0)
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return -EINVAL;
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return flush_fd(udev_queue->fd);
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}
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