}

	// TODO(bradfitz,brainman): use ctx more. See TODO below.

	var family int32 = syscall.AF_UNSPEC
	switch ipVersion(network) {
	case '4':
		family = syscall.AF_INET
	case '6':
		family = syscall.AF_INET6
	}

	getaddr := func() ([]IPAddr, error) {
		if err := acquireThread(ctx); err != nil {
			return nil, &DNSError{
				Name:      name,
				Err:       mapErr(err).Error(),

	validateIP := func(ip IP) error {
		switch family {
		case syscall.AF_INET:
			if len(ip) != 4 {
				return &AddrError{
					Err:  "non-IPv4 address",
					Addr: ip.String(),
				}
			}
		case syscall.AF_INET6:
			if len(ip) != 16 {
				return &AddrError{
					Err:  "non-IPv6 address",
					Addr: ip.String(),
				}
			}
		default:
			panic("net: unexpected address family in validateResolvedAddr")
		}

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
}

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
}

func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
}

func Socket(domain, typ, proto int) (fd int, err error) {
	if domain == AF_INET6 && SocketDisableIPv6 {
		return -1, EAFNOSUPPORT
	}
	fd, err = socket(domain, typ, proto)
	return
}

func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
	var fdx [2]int32

	StandardBias int32
	DaylightName [32]uint16
	DaylightDate Systemtime
	DaylightBias int32
}

// Socket related.

const (
	AF_UNSPEC  = 0
	AF_UNIX    = 1
	AF_INET    = 2
	AF_INET6   = 23
	AF_NETBIOS = 17

	SOCK_STREAM    = 1
	SOCK_DGRAM     = 2
	SOCK_RAW       = 3
	SOCK_SEQPACKET = 5

	IPPROTO_IP   = 0
	IPPROTO_IPV6 = 0x29
	IPPROTO_TCP  = 6
	IPPROTO_UDP  = 17

}

func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
	if sa.Port < 0 || sa.Port > 0xFFFF {
		return nil, 0, EINVAL
	}
	sa.raw.Family = AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	sa.raw.Scope_id = sa.ZoneId
	sa.raw.Addr = sa.Addr
	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
}

	AF_DLI                          = 13
	AF_ECMA                         = 8
	AF_HYLINK                       = 15
	AF_IMPLINK                      = 3
	AF_INET                         = 2
	AF_INET6                        = 19
	AF_INTF                         = 20
	AF_IUCV                         = 17
	AF_LAT                          = 14
	AF_LINK                         = 18

}

func sockaddrInet6ToRaw(rsa *syscall.RawSockaddrAny, sa *syscall.SockaddrInet6) int32 {
	*rsa = syscall.RawSockaddrAny{}
	raw := (*syscall.RawSockaddrInet6)(unsafe.Pointer(rsa))
	raw.Family = syscall.AF_INET6
	p := (*[2]byte)(unsafe.Pointer(&raw.Port))
	p[0] = byte(sa.Port >> 8)
	p[1] = byte(sa.Port)
	raw.Scope_id = sa.ZoneId
	raw.Addr = sa.Addr
	return int32(unsafe.Sizeof(*raw))
}