return 0, err
		}
		return c.fd.writeToInet4(b, &sa)
	case syscall.AF_INET6:
		sa, err := ipToSockaddrInet6(addr.IP, addr.Port, addr.Zone)
		if err != nil {
			return 0, err
		}
		return c.fd.writeToInet6(b, &sa)
	default:
		return 0, &AddrError{Err: "invalid address family", Addr: addr.IP.String()}
	}
}

func (c *UDPConn) writeToAddrPort(b []byte, addr netip.AddrPort) (int, error) {
	if c.fd.isConnected {

			if err = fd.pd.waitWrite(fd.isFile); err == nil {
				continue
			}
		}
		if err != nil {
			return 0, err
		}
		return len(p), nil
	}
}

// WriteToInet6 wraps the sendto network call for IPv6 addresses.
func (fd *FD) WriteToInet6(p []byte, sa *syscall.SockaddrInet6) (int, error) {
	if err := fd.writeLock(); err != nil {
		return 0, err
	}
	defer fd.writeUnlock()

}

func (ffd *fakeNetFD) writeToInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
	return ffd.writeTo(p, sa)
}

func (ffd *fakeNetFD) writeToInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
	return ffd.writeTo(p, sa)
}

func (ffd *fakeNetFD) dup() (f *os.File, err error) {
	return nil, os.NewSyscallError("dup", syscall.ENOSYS)
}