| Paolo 'Blaisorblade' Giarrusso | 60b2737 | 2005-06-21 17:16:25 -0700 | [diff] [blame] | 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 | |
| 9 | static int errno; |
| 10 | |
| 11 | static inline _syscall2(int,munmap,void *,start,size_t,len) |
| 12 | static inline _syscall6(void *,mmap2,void *,addr,size_t,len,int,prot,int,flags,int,fd,off_t,offset) |
| 13 | int 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) != to){ |
| 19 | return(-1); |
| 20 | } |
| 21 | if(munmap(from, size) < 0){ |
| 22 | return(-1); |
| 23 | } |
| 24 | return(0); |
| 25 | } |