libgo/go/net/sockoptip_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         "runtime"
  10         "syscall"
  11         "unsafe"
  12 )
  13
  14 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
  15         ip, err := interfaceToIPv4Addr(ifi)
  16         if err != nil {
  17                 return os.NewSyscallError("setsockopt", err)
  18         }
  19         var a [4]byte
  20         copy(a[:], ip.To4())
  21         err = fd.pfd.Setsockopt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4)
  22         runtime.KeepAlive(fd)
  23         return wrapSyscallError("setsockopt", err)
  24 }
  25
  26 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
  27         err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
  28         runtime.KeepAlive(fd)
  29         return wrapSyscallError("setsockopt", err)
  30 }