# [−][src]Macro nix::request_code_none

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

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));

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