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         "syscall"
  10         "unsafe"
  11 )
  12
  13 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
  14         ip, err := interfaceToIPv4Addr(ifi)
  15         if err != nil {
  16                 return os.NewSyscallError("setsockopt", err)
  17         }
  18         var a [4]byte
  19         copy(a[:], ip.To4())
  20         if err := fd.incref(); err != nil {
  21                 return err
  22         }
  23         defer fd.decref()
  24         return os.NewSyscallError("setsockopt", syscall.Setsockopt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, (*byte)(unsafe.Pointer(&a[0])), 4))
  25 }
  26
  27 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
  28         if err := fd.incref(); err != nil {
  29                 return err
  30         }
  31         defer fd.decref()
  32         return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v)))
  33 }