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

        public static unsafe SocketError GetSockOpt(SafeCloseSocket handle, SocketOptionLevel optionLevel, SocketOptionName optionName, byte[] optionValue, ref int optionLength)
        {
            int optLen = optionLength;

            Interop.Error err;
            if (optionValue == null || optionValue.Length == 0)
            {
                optLen = 0;
                err = Interop.Sys.GetSockOpt(handle, optionLevel, optionName, null, &optLen);
            }
            else if (optionName == SocketOptionName.Error && optionValue.Length >= sizeof(int))
            {
                int outError;
                SocketError returnError = GetSockOpt(handle, optionLevel, optionName, out outError);
                if (returnError == SocketError.Success)
                {
                    fixed (byte* pinnedValue = optionValue)
                    {
                        Debug.Assert(BitConverter.IsLittleEndian, "Expected little endian");
                        *((int*)pinnedValue) = outError;
                    }
                    optionLength = sizeof(int);
                }
                return returnError;
            }
            else
            {
                fixed (byte* pinnedValue = optionValue)
                {
                    err = Interop.Sys.GetSockOpt(handle, optionLevel, optionName, pinnedValue, &optLen);
                }
            }

            if (err == Interop.Error.SUCCESS)
            {
                optionLength = optLen;
                return SocketError.Success;
            }

            return GetSocketErrorForErrorCode(err);
        }