github.com/mdempsky/go@v0.0.0-20151201204031-5dd372bd1e70/src/net/sockopt_windows.go (about)

     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  }