Macro request_code_write_int 

macro_rules! request_code_write_int {
    ($g:expr, $n:expr) => { ... };
}

Available on Unix only.

Generate an ioctl request code for a command that passes an integer

This is equivalent to the _IOWINT() macro exposed by the C ioctl API.

You should only use this macro directly if the ioctl you’re working with is “bad” and you cannot use ioctl_write_int!() directly.