NetBSD-5.0.2/dist/nvi/clib/mmap.c

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/*	$NetBSD: mmap.c,v 1.1.1.2 2008/05/18 14:29:38 aymeric Exp $ */

#include "config.h"

#include <sys/types.h>

#include <stdlib.h>
#include <unistd.h>

/*
 * This function fakes mmap() by reading `len' bytes from the file descriptor
 * `fd' and returning a pointer to that memory.  The "mapped" region can later
 * be deallocated with munmap().
 *
 * Note: ONLY reading is supported and only reading of the exact size of the
 * file will work.
 *
 * PUBLIC: #ifndef HAVE_MMAP
 * PUBLIC: char *mmap __P((char *, size_t, int, int, int, off_t));
 * PUBLIC: #endif
 */
char *
mmap(char *addr, size_t len, int prot, int flags, int fd, off_t off)
{
	char *ptr;

	if ((ptr = (char *)malloc(len)) == 0)
		return ((char *)-1);
	if (read(fd, ptr, len) < 0) {
		free(ptr);
		return ((char *)-1);
	}
	return (ptr);
}

/*
 * PUBLIC: #ifndef HAVE_MMAP
 * PUBLIC: int munmap __P((char *, size_t));
 * PUBLIC: #endif
 */
int
munmap(char *addr, size_t len)
{
	free(addr);
	return (0);
}