Source file src/net/sockopt_windows.go

     1	// Copyright 2011 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	package net
     6	
     7	import (
     8		"os"
     9		"syscall"
    10	)
    11	
    12	func setDefaultSockopts(s syscall.Handle, family, sotype int, ipv6only bool) error {
    13		if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
    14			// Allow both IP versions even if the OS default
    15			// is otherwise. Note that some operating systems
    16			// never admit this option.
    17			syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
    18		}
    19		// Allow broadcast.
    20		syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
    21		return nil
    22	}
    23	
    24	func setDefaultListenerSockopts(s syscall.Handle) error {
    25		// Windows will reuse recently-used addresses by default.
    26		// SO_REUSEADDR should not be used here, as it allows
    27		// a socket to forcibly bind to a port in use by another socket.
    28		// This could lead to a non-deterministic behavior, where
    29		// connection requests over the port cannot be guaranteed
    30		// to be handled by the correct socket.
    31		return nil
    32	}
    33	
    34	func setDefaultMulticastSockopts(s syscall.Handle) error {
    35		// Allow multicast UDP and raw IP datagram sockets to listen
    36		// concurrently across multiple listeners.
    37		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
    38	}
    39	

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