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git.ipfire.org Git - thirdparty/systemd.git/blob - src/libudev/libudev-queue.c
1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
6 Copyright 2009 Alan Jenkins <alan-jenkins@tuffmail.co.uk>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/inotify.h>
28 #include "alloc-util.h"
31 #include "libudev-private.h"
34 * SECTION:libudev-queue
35 * @short_description: access to currently active events
37 * This exports the current state of the udev processing queue.
43 * Opaque object representing the current event queue in the udev daemon.
53 * @udev: udev library context
55 * The initial refcount is 1, and needs to be decremented to
56 * release the resources of the udev queue context.
58 * Returns: the udev queue context, or #NULL on error.
60 _public_
struct udev_queue
*udev_queue_new(struct udev
*udev
)
62 struct udev_queue
*udev_queue
;
69 udev_queue
= new0(struct udev_queue
, 1);
70 if (udev_queue
== NULL
) {
75 udev_queue
->refcount
= 1;
76 udev_queue
->udev
= udev
;
83 * @udev_queue: udev queue context
85 * Take a reference of a udev queue context.
87 * Returns: the same udev queue context.
89 _public_
struct udev_queue
*udev_queue_ref(struct udev_queue
*udev_queue
)
91 if (udev_queue
== NULL
)
94 udev_queue
->refcount
++;
100 * @udev_queue: udev queue context
102 * Drop a reference of a udev queue context. If the refcount reaches zero,
103 * the resources of the queue context will be released.
107 _public_
struct udev_queue
*udev_queue_unref(struct udev_queue
*udev_queue
)
109 if (udev_queue
== NULL
)
112 udev_queue
->refcount
--;
113 if (udev_queue
->refcount
> 0)
116 safe_close(udev_queue
->fd
);
118 return mfree(udev_queue
);
122 * udev_queue_get_udev:
123 * @udev_queue: udev queue context
125 * Retrieve the udev library context the queue context was created with.
127 * Returns: the udev library context.
129 _public_
struct udev
*udev_queue_get_udev(struct udev_queue
*udev_queue
)
131 if (udev_queue
== NULL
) {
135 return udev_queue
->udev
;
139 * udev_queue_get_kernel_seqnum:
140 * @udev_queue: udev queue context
142 * This function is deprecated.
146 _public_
unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue
*udev_queue
)
152 * udev_queue_get_udev_seqnum:
153 * @udev_queue: udev queue context
155 * This function is deprecated.
159 _public_
unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue
*udev_queue
)
165 * udev_queue_get_udev_is_active:
166 * @udev_queue: udev queue context
168 * Check if udev is active on the system.
170 * Returns: a flag indicating if udev is active.
172 _public_
int udev_queue_get_udev_is_active(struct udev_queue
*udev_queue
)
174 return access("/run/udev/control", F_OK
) >= 0;
178 * udev_queue_get_queue_is_empty:
179 * @udev_queue: udev queue context
181 * Check if udev is currently processing any events.
183 * Returns: a flag indicating if udev is currently handling events.
185 _public_
int udev_queue_get_queue_is_empty(struct udev_queue
*udev_queue
)
187 return access("/run/udev/queue", F_OK
) < 0;
191 * udev_queue_get_seqnum_sequence_is_finished:
192 * @udev_queue: udev queue context
193 * @start: first event sequence number
194 * @end: last event sequence number
196 * This function is deprecated, it just returns the result of
197 * udev_queue_get_queue_is_empty().
199 * Returns: a flag indicating if udev is currently handling events.
201 _public_
int udev_queue_get_seqnum_sequence_is_finished(struct udev_queue
*udev_queue
,
202 unsigned long long int start
, unsigned long long int end
)
204 return udev_queue_get_queue_is_empty(udev_queue
);
208 * udev_queue_get_seqnum_is_finished:
209 * @udev_queue: udev queue context
210 * @seqnum: sequence number
212 * This function is deprecated, it just returns the result of
213 * udev_queue_get_queue_is_empty().
215 * Returns: a flag indicating if udev is currently handling events.
217 _public_
int udev_queue_get_seqnum_is_finished(struct udev_queue
*udev_queue
, unsigned long long int seqnum
)
219 return udev_queue_get_queue_is_empty(udev_queue
);
223 * udev_queue_get_queued_list_entry:
224 * @udev_queue: udev queue context
226 * This function is deprecated.
230 _public_
struct udev_list_entry
*udev_queue_get_queued_list_entry(struct udev_queue
*udev_queue
)
238 * @udev_queue: udev queue context
240 * Returns: a file descriptor to watch for a queue to become empty.
242 _public_
int udev_queue_get_fd(struct udev_queue
*udev_queue
) {
246 if (udev_queue
->fd
>= 0)
247 return udev_queue
->fd
;
249 fd
= inotify_init1(IN_CLOEXEC
);
253 r
= inotify_add_watch(fd
, "/run/udev" , IN_DELETE
);
266 * @udev_queue: udev queue context
268 * Returns: the result of clearing the watch for queue changes.
270 _public_
int udev_queue_flush(struct udev_queue
*udev_queue
) {
271 if (udev_queue
->fd
< 0)
274 return flush_fd(udev_queue
->fd
);