| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <sys/mman.h> |
| 7 | |
| 8 | int switcheroo(int fd, int prot, void *from, void *to, int size) |
| 9 | { |
| 10 | if(munmap(to, size) < 0){ |
| 11 | return(-1); |
| 12 | } |
| 13 | if(mmap(to, size, prot, MAP_SHARED | MAP_FIXED, fd, 0) != to){ |
| 14 | return(-1); |
| 15 | } |
| 16 | if(munmap(from, size) < 0){ |
| 17 | return(-1); |
| 18 | } |
| 19 | return(0); |
| 20 | } |
| 21 | |
| 22 | /* |
| 23 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 24 | * Emacs will notice this stuff at the end of the file and automatically |
| 25 | * adjust the settings for this buffer only. This must remain at the end |
| 26 | * of the file. |
| 27 | * --------------------------------------------------------------------------- |
| 28 | * Local variables: |
| 29 | * c-file-style: "linux" |
| 30 | * End: |
| 31 | */ |