26 lines
572 B
C
26 lines
572 B
C
/*
|
|
* 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);
|
|
}
|