Imported Upstream version 1.4upstream/1.4

1 files changed, 38 insertions, 0 deletions

diff --git a/src/net/sockopt_windows.go b/src/net/sockopt_windows.go
new file mode 100644
index 000000000..cb64a40c6
--- /dev/null
+++ b/src/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.
+
+package net
+
+import (
+	"os"
+	"syscall"
+)
+
+func setDefaultSockopts(s syscall.Handle, family, sotype int, ipv6only bool) error {
+	if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
+		// Allow both IP versions even if the OS default
+		// is otherwise.  Note that some operating systems
+		// never admit this option.
+		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
+	}
+	// Allow broadcast.
+	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
+	return nil
+}
+
+func setDefaultListenerSockopts(s syscall.Handle) error {
+	// 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.
+	return nil
+}
+
+func setDefaultMulticastSockopts(s syscall.Handle) error {
+	// Allow multicast UDP and raw IP datagram sockets to listen
+	// concurrently across multiple listeners.
+	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
+}