/* | |
* Copyright (C) 2000 Jeff Dike (jdike@karaya.com) | |
* Licensed under the GPL | |
*/ | |
#include <linux/mman.h> | |
#include <asm/unistd.h> | |
static int errno; | |
static inline _syscall2(int,munmap,void *,start,size_t,len) | |
static inline _syscall6(void *,mmap,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset) | |
int switcheroo(int fd, int prot, void *from, void *to, int size) | |
{ | |
if(munmap(to, size) < 0){ | |
return(-1); | |
} | |
if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) == (void*) -1){ | |
return(-1); | |
} | |
if(munmap(from, size) < 0){ | |
return(-1); | |
} | |
return(0); | |
} |