System.Net.Sockets.SocketPal.GetSockOpt C# (CSharp) Метод

        public static unsafe SocketError GetSockOpt(SafeCloseSocket handle, SocketOptionLevel optionLevel, SocketOptionName optionName, out int optionValue)
        {
            if (optionLevel == SocketOptionLevel.Socket)
            {
                if (optionName == SocketOptionName.ReceiveTimeout)
                {
                    optionValue = handle.ReceiveTimeout == -1 ? 0 : handle.ReceiveTimeout;
                    return SocketError.Success;
                }
                else if (optionName == SocketOptionName.SendTimeout)
                {
                    optionValue = handle.SendTimeout == -1 ? 0 : handle.SendTimeout;
                    return SocketError.Success;
                }
            }

            if (optionName == SocketOptionName.Error)
            {
                Interop.Error socketError = default(Interop.Error);
                Interop.Error getErrorError = Interop.Sys.GetSocketErrorOption(handle, &socketError);
                optionValue = (int)GetSocketErrorForErrorCode(socketError);
                return getErrorError == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(getErrorError);
            }

            int value = 0;
            int optLen = sizeof(int);
            Interop.Error err = Interop.Sys.GetSockOpt(handle, optionLevel, optionName, (byte*)&value, &optLen);

            optionValue = value;
            return err == Interop.Error.SUCCESS ? SocketError.Success : GetSocketErrorForErrorCode(err);
        }