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      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 	"runtime"
      9 	"syscall"
     10 )
     11 
     12 func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
     13 	var v int32
     14 	if ifi != nil {
     15 		v = int32(ifi.Index)
     16 	}
     17 	mreq := &syscall.IPMreqn{Ifindex: v}
     18 	err := fd.pfd.SetsockoptIPMreqn(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
     19 	runtime.KeepAlive(fd)
     20 	return wrapSyscallError("setsockopt", err)
     21 }
     22 
     23 func setIPv4MulticastLoopback(fd *netFD, v bool) error {
     24 	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
     25 	runtime.KeepAlive(fd)
     26 	return wrapSyscallError("setsockopt", err)
     27 }
     28