1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2003-2008 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 #include <errno.h>
29 #include <com32.h>
30 #include <string.h>
31 #include <unistd.h>
32 #include <fcntl.h>
33 #include "file.h"
34
35 /*
36 * openmem.c
37 *
38 * Open a chunk of memory as if it was a file
39 */
40
41 const struct input_dev __file_dev;
42
openmem(const void * base,size_t len,int flags)43 int openmem(const void *base, size_t len, int flags)
44 {
45 int fd;
46 struct file_info *fp;
47
48 fd = opendev(&__file_dev, NULL, flags);
49
50 if (fd < 0)
51 return -1;
52
53 fp = &__file_info[fd];
54
55 fp->i.fd.size = fp->i.nbytes = len;
56 fp->i.datap = (void *)base;
57 fp->i.fd.handle = 0; /* No actual file */
58 fp->i.offset = 0;
59
60 return fd;
61 }
62