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Source file src/pkg/net/sockopt_linux.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, 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		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
    21	}
    22	
    23	func setDefaultListenerSockopts(s int) error {
    24		// Allow reuse of recently-used addresses.
    25		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
    26	}
    27	
    28	func setDefaultMulticastSockopts(s int) error {
    29		// Allow multicast UDP and raw IP datagram sockets to listen
    30		// concurrently across multiple listeners.
    31		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
    32	}
    33	

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