sig
exception Not_available of string
val windows : bool
type feature =
[ `fd_passing
| `fdatasync
| `get_affinity
| `get_cpu
| `get_credentials
| `madvise
| `mincore
| `recv_msg
| `send_msg
| `set_affinity
| `wait4 ]
val have : Lwt_sys.feature -> bool
type byte_order = Little_endian | Big_endian
val byte_order : Lwt_sys.byte_order
end