1POSIX_FADV_NORMAL	0
2POSIX_FADV_RANDOM	1
3POSIX_FADV_SEQUENTIAL	2
4POSIX_FADV_WILLNEED	3
5#if defined __s390x__
6POSIX_FADV_DONTNEED	6
7POSIX_FADV_NOREUSE	7
8#else
9POSIX_FADV_DONTNEED	4
10POSIX_FADV_NOREUSE	5
11#endif
12