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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 (
"os"
"syscall"
)
func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
var v int32
if ifi != nil {
v = int32(ifi.Index)
}
mreq := &syscall.IPMreqn{Ifindex: v}
if err := fd.incref(false); err != nil {
return err
}
defer fd.decref()
err := syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setIPv4MulticastLoopback(fd *netFD, v bool) error {
if err := fd.incref(false); err != nil {
return err
}
defer fd.decref()
err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
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