/// An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call.

    public static extern int getsockopt(IntPtr s, SocketOptionLevel level, SocketOptionName optname, out int optval, ref int optlen);

Declare Function getsockopt Lib "ws2_32.dll" (TODO) As TODO

        Native.getsockopt(socketPtr, Native.SocketOptionLevel.Socket, Native.SocketOptionName.ReceiveTimeout, out optval, ref optlen);

        Native.getsockopt(socketPtr, Native.SocketOptionLevel.Socket, Native.SocketOptionName.ReceiveTimeout, out optval, ref optlen);