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1 /* ----------------------------------------------------------------------- *
2  *
3  *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
4  *
5  *   Permission is hereby granted, free of charge, to any person
6  *   obtaining a copy of this software and associated documentation
7  *   files (the "Software"), to deal in the Software without
8  *   restriction, including without limitation the rights to use,
9  *   copy, modify, merge, publish, distribute, sublicense, and/or
10  *   sell copies of the Software, and to permit persons to whom
11  *   the Software is furnished to do so, subject to the following
12  *   conditions:
13  *
14  *   The above copyright notice and this permission notice shall
15  *   be included in all copies or substantial portions of the Software.
16  *
17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24  *   OTHER DEALINGS IN THE SOFTWARE.
25  *
26  * ----------------------------------------------------------------------- */
27 
28 /*
29  * null_read.c
30  *
31  * Reading null device
32  */
33 
34 #include <errno.h>
35 #include <string.h>
36 #include <com32.h>
37 #include <minmax.h>
38 #include "file.h"
39 
__null_read(struct file_info * fp,void * buf,size_t count)40 static ssize_t __null_read(struct file_info *fp, void *buf, size_t count)
41 {
42     (void)fp;
43     (void)buf;
44     (void)count;
45     return 0;
46 }
47 
48 const struct input_dev dev_null_r = {
49     .dev_magic = __DEV_MAGIC,
50     .flags = __DEV_INPUT | __DEV_NULL,
51     .fileflags = O_RDONLY,
52     .read = __null_read,
53     .close = NULL,
54 };
55