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
5package net
6
7import (
8	"os"
9	"runtime"
10	"syscall"
11)
12
13func 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	err = fd.pfd.SetsockoptInet4Addr(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a)
21	runtime.KeepAlive(fd)
22	return wrapSyscallError("setsockopt", err)
23}
24
25func setIPv4MulticastLoopback(fd *netFD, v bool) error {
26	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
27	runtime.KeepAlive(fd)
28	return wrapSyscallError("setsockopt", err)
29}
30