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