Function get_auth 

pub fn get_auth(
    family: Family,
    address: &[u8],
    display: u16,
) -> Result<Option<(Vec<u8>, Vec<u8>)>, Error>

Get the authentication information necessary for connecting to the given display.

• family is the protocol family that is used for connecting; this describes how to interpret the address.
• address is the raw bytes describing the address that is being connected to.
• display is the display number.

If successful, this function returns that can be written to the X11 server as authorization protocol name and data, respectively.