Macro nix::sys::ioctl::request_code_none

macro_rules! request_code_none {
    ($ty:expr, $nr:expr) => { ... };
}

Available on crate feature ioctl only.

Generate an ioctl request code for a command that passes no data.

This is equivalent to the _IO() 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_none!() directly.

Example

const KVMIO: u8 = 0xAE;
ioctl_write_int_bad!(kvm_create_vm, request_code_none!(KVMIO, 0x03));