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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"runtime"
"syscall"
)
func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
var v int32
if ifi != nil {
v = int32(ifi.Index)
}
mreq := &syscall.IPMreqn{Ifindex: v}
err := fd.pfd.SetsockoptIPMreqn(syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}
func setIPv4MulticastLoopback(fd *netFD, v bool) error {
err := fd.pfd.SetsockoptInt(syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
runtime.KeepAlive(fd)
return wrapSyscallError("setsockopt", err)
}