1#include "config.h"
2
3#include <sys/types.h>
4
5#include <stdlib.h>
6#include <unistd.h>
7
8/*
9 * This function fakes mmap() by reading `len' bytes from the file descriptor
10 * `fd' and returning a pointer to that memory.  The "mapped" region can later
11 * be deallocated with munmap().
12 *
13 * Note: ONLY reading is supported and only reading of the exact size of the
14 * file will work.
15 *
16 * PUBLIC: #ifndef HAVE_MMAP
17 * PUBLIC: char *mmap __P((char *, size_t, int, int, int, off_t));
18 * PUBLIC: #endif
19 */
20char *
21mmap(char *addr, size_t len, int prot, int flags, int fd, off_t off)
22{
23	char *ptr;
24
25	if ((ptr = (char *)malloc(len)) == 0)
26		return ((char *)-1);
27	if (read(fd, ptr, len) < 0) {
28		free(ptr);
29		return ((char *)-1);
30	}
31	return (ptr);
32}
33
34/*
35 * PUBLIC: #ifndef HAVE_MMAP
36 * PUBLIC: int munmap __P((char *, size_t));
37 * PUBLIC: #endif
38 */
39int
40munmap(char *addr, size_t len)
41{
42	free(addr);
43	return (0);
44}
45