libgo/go/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 }