Macro ioctl_readwrite

macro_rules! ioctl_readwrite {
    ($(#[$attr:meta])* $name:ident, $ioty:expr, $nr:expr, $ty:ty) => { ... };
}

Generates a wrapper function for an ioctl that reads and writes data to the kernel.

The arguments to this macro are:

• The function name
• The ioctl identifier
• The ioctl sequence number
• The data type passed by this ioctl

The generated function has the following signature:

pub unsafe fn FUNCTION_NAME(fd: libc::c_int, data: *mut DATA_TYPE) -> Result<libc::c_int>

For a more in-depth explanation of ioctls, see ::sys::ioctl.

Example

ioctl_readwrite!(enum_audio, b'V', 65, v4l2_audio);