private static extern unsafe int ToSockaddr (IntPtr source, long size, _SockaddrHeader* destination);
private static extern unsafe int FromSockaddr (_SockaddrHeader* source, IntPtr destination);
private static extern unsafe int ToSockaddr (IntPtr source, long size, _SockaddrHeader* destination);
private static extern unsafe int FromSockaddr (_SockaddrHeader* source, IntPtr destination);