1/*
2 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/mman.h>
7#include <asm/unistd.h>
8
9static int errno;
10
11static inline _syscall2(int,munmap,void *,start,size_t,len)
12static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset)
13int switcheroo(int fd, int prot, void *from, void *to, int size)
14{
15	if(munmap(to, size) < 0){
16		return(-1);
17	}
18	if(mmap2(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1 ){
19		return(-1);
20	}
21	if(munmap(from, size) < 0){
22		return(-1);
23	}
24	return(0);
25}
26