func GetsockoptXucred(fd, level, opt int) (*Xucred, error) {
	x := new(Xucred)
	vallen := _Socklen(SizeofXucred)
	err := getsockopt(fd, level, opt, unsafe.Pointer(x), &vallen)
	return x, err
}

func GetsockoptTCPConnectionInfo(fd, level, opt int) (*TCPConnectionInfo, error) {
	var value TCPConnectionInfo
	vallen := _Socklen(SizeofTCPConnectionInfo)
	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
	return &value, err