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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