1 files changed, 38 insertions, 0 deletions
diff --git a/libgo/go/net/sockopt_windows.go b/libgo/go/net/sockopt_windows.go
new file mode 100644
index 00000000000..485c14a2d3e
--- /dev/null
+++ b/libgo/go/net/sockopt_windows.go
@@ -0,0 +1,38 @@
+// Copyright 2011 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.
+
+// Socket options for Windows
+
+package net
+
+import (
+	"syscall"
+)
+
+func setDefaultSockopts(s syscall.Handle, f, p int) {
+	switch f {
+	case syscall.AF_INET6:
+		// Allow both IP versions even if the OS default is otherwise.
+		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
+	}
+
+	// Windows will reuse recently-used addresses by default.
+	// SO_REUSEADDR should not be used here, as it allows
+	// a socket to forcibly bind to a port in use by another socket.
+	// This could lead to a non-deterministic behavior, where
+	// connection requests over the port cannot be guaranteed
+	// to be handled by the correct socket.
+
+	// Allow broadcast.
+	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
+
+}
+
+func setDefaultMulticastSockopts(fd *netFD) {
+	fd.incref()
+	defer fd.decref()
+	// Allow multicast UDP and raw IP datagram sockets to listen
+	// concurrently across multiple listeners.
+	syscall.SetsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+}