Function CFSocketRegisterSocketSignature 

pub unsafe extern "C-unwind" fn CFSocketRegisterSocketSignature(
    name_server_signature: *const CFSocketSignature,
    timeout: CFTimeInterval,
    name: Option<&CFString>,
    signature: *const CFSocketSignature,
) -> CFSocketError

👎Deprecated:

renamed to CFSocket::register_socket_signature

Available on crate features CFData and CFDate and CFSocket only.