xref: /openbmc/qemu/chardev/char-null.c (revision a050901d)
1 /*
2  * QEMU System Emulator
3  *
4  * Copyright (c) 2003-2008 Fabrice Bellard
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to deal
8  * in the Software without restriction, including without limitation the rights
9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  * copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22  * THE SOFTWARE.
23  */
24 
25 #include "qemu/osdep.h"
26 #include "chardev/char.h"
27 #include "qemu/module.h"
28 
null_chr_open(Chardev * chr,ChardevBackend * backend,bool * be_opened,Error ** errp)29 static void null_chr_open(Chardev *chr,
30                           ChardevBackend *backend,
31                           bool *be_opened,
32                           Error **errp)
33 {
34     *be_opened = false;
35 }
36 
char_null_class_init(ObjectClass * oc,void * data)37 static void char_null_class_init(ObjectClass *oc, void *data)
38 {
39     ChardevClass *cc = CHARDEV_CLASS(oc);
40 
41     cc->open = null_chr_open;
42 }
43 
44 static const TypeInfo char_null_type_info = {
45     .name = TYPE_CHARDEV_NULL,
46     .parent = TYPE_CHARDEV,
47     .instance_size = sizeof(Chardev),
48     .class_init = char_null_class_init,
49 };
50 
register_types(void)51 static void register_types(void)
52 {
53     type_register_static(&char_null_type_info);
54 }
55 
56 type_init(register_types);
57