Macro ioctl

macro_rules! ioctl {
    ($direction:expr, $code:expr, $number:expr, $ty:ty) => { ... };
    ($code:expr, $number:expr, $ty:ty) => { ... };
    (write; $code:expr, $number:expr, $ty:ty) => { ... };
    (read; $code:expr, $number:expr, $ty:ty) => { ... };
    (read + write; $code:expr, $number:expr, $ty:ty) => { ... };
}