--- /dev/null
+++ b/src/libgo/go/net/sock_gnu.go
@@ -0,0 +1,43 @@
+// Copyright 2009 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Sockets for GNU/Hurd
+
+package net
+
+import "syscall"
+
+func maxListenerBacklog() int {
+       // TODO: Implement this
+       return syscall.SOMAXCONN
+}
+
+func listenerSockaddr(s, f int, la syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (syscall.Sockaddr, error) {
+	a := toAddr(la)
+	if a == nil {
+		return la, nil
+	}
+	switch v := a.(type) {
+	case *TCPAddr, *UnixAddr:
+		err := setDefaultListenerSockopts(s)
+		if err != nil {
+			return nil, err
+		}
+	case *UDPAddr:
+		if v.IP.IsMulticast() {
+			err := setDefaultMulticastSockopts(s)
+			if err != nil {
+				return nil, err
+			}
+			switch f {
+			case syscall.AF_INET:
+				v.IP = IPv4zero
+			case syscall.AF_INET6:
+				v.IP = IPv6unspecified
+			}
+			return v.sockaddr(f)
+		}
+	}
+	return la, nil
+}