func setIPv4MulticastInterface(fd int, ifi *net.Interface) error {
ip, err := netInterfaceToIP4(ifi)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
var v [4]byte
copy(v[:], ip.To4())
return os.NewSyscallError("setsockopt", syscall.SetsockoptInet4Addr(fd, ianaProtocolIP, syscall.IP_MULTICAST_IF, v))
}
func setIPv4MulticastInterface(fd int, ifi *net.Interface) error {
ip, err := netInterfaceToIP4(ifi)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
var a [4]byte
copy(a[:], ip.To4())
err = syscall.SetsockoptInet4Addr(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
return nil
}
func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
ip, err := interfaceToIPv4Addr(ifi)
if err != nil {
return os.NewSyscallError("setsockopt", err)
}
var a [4]byte
copy(a[:], ip.To4())
if err := fd.incref(); err != nil {
return err
}
defer fd.decref()
return os.NewSyscallError("setsockopt", syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, a))
}