return nil
}

func setDefaultListenerSockopts(s int) error {
	return nil
}

func setDefaultMulticastSockopts(s int) error {
	return nil
}

func setReadBuffer(fd *netFD, bytes int) error {
	if fd.fakeNetFD != nil {
		return fd.fakeNetFD.setReadBuffer(bytes)
	}
	return syscall.ENOPROTOOPT
}

func setWriteBuffer(fd *netFD, bytes int) error {
	if fd.fakeNetFD != nil {
		return fd.fakeNetFD.setWriteBuffer(bytes)

	}
	defer c.Close()
	c.LocalAddr()
	c.RemoteAddr()
	c.SetDeadline(time.Now().Add(someTimeout))
	c.SetReadDeadline(time.Now().Add(someTimeout))
	c.SetWriteDeadline(time.Now().Add(someTimeout))
	c.SetReadBuffer(2048)
	c.SetWriteBuffer(2048)

	wb := []byte("UDPCONN TEST")
	rb := make([]byte, 128)
	if _, err := c.WriteToUDP(wb, c.LocalAddr().(*UDPAddr)); err != nil {
		t.Fatal(err)
	}

				copy(mreq.Interface[:], a)
				goto done
			}
		}
	}
done:
	if bytealg.Equal(mreq.Multiaddr[:], IPv4zero.To4()) {
		return errNoSuchMulticastInterface
	}
	return nil
}

func setReadBuffer(fd *netFD, bytes int) error {
	err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

		p.clear()
		packetPool.Put(p)
	} else {
		p.bufOffset += n
	}

	return n, from, nil
}

// setReadBuffer sets a soft limit on the number of bytes available to read
// from the pipe.
func (pq *packetQueue) setReadBuffer(bytes int) error {
	if bytes <= 0 {
		return os.NewSyscallError("setReadBuffer", syscall.EINVAL)
	}
	q := pq.get() // Use the queue as a lock.
	q.readBufferBytes = bytes
	pq.put(q)

	dfd, err := syscall.Dup(int(f.Fd()), -1)
	if err != nil {
		return nil, os.NewSyscallError("dup", err)
	}
	return os.NewFile(uintptr(dfd), s), nil
}

func setReadBuffer(fd *netFD, bytes int) error {
	return syscall.EPLAN9
}

func setWriteBuffer(fd *netFD, bytes int) error {
	return syscall.EPLAN9
}

func (fd *netFD) SetDeadline(t time.Time) error {

	}
	return nil
}

// SetReadBuffer sets the size of the operating system's
// receive buffer associated with the connection.
func (c *conn) SetReadBuffer(bytes int) error {
	if !c.ok() {
		return syscall.EINVAL
	}
	if err := setReadBuffer(c.fd, bytes); err != nil {
		return &OpError{Op: "set", Net: c.fd.net, Source: nil, Addr: c.fd.laddr, Err: err}
	}

		{"(*IPConn).ReadFrom", Method, 0},
		{"(*IPConn).ReadFromIP", Method, 0},
		{"(*IPConn).ReadMsgIP", Method, 1},
		{"(*IPConn).RemoteAddr", Method, 0},
		{"(*IPConn).SetDeadline", Method, 0},
		{"(*IPConn).SetReadBuffer", Method, 0},
		{"(*IPConn).SetReadDeadline", Method, 0},
		{"(*IPConn).SetWriteBuffer", Method, 0},
		{"(*IPConn).SetWriteDeadline", Method, 0},
		{"(*IPConn).SyscallConn", Method, 9},

pkg net, method (*IPConn) ReadFromIP([]uint8) (int, *IPAddr, error)
pkg net, method (*IPConn) RemoteAddr() Addr
pkg net, method (*IPConn) SetDeadline(time.Time) error
pkg net, method (*IPConn) SetReadBuffer(int) error
pkg net, method (*IPConn) SetReadDeadline(time.Time) error
pkg net, method (*IPConn) SetWriteBuffer(int) error
pkg net, method (*IPConn) SetWriteDeadline(time.Time) error