(raddr == nil || raddr.family() == syscall.AF_INET) {
		return syscall.AF_INET, false
	}
	return syscall.AF_INET6, false
}

func internetSocket(ctx context.Context, net string, laddr, raddr sockaddr, sotype, proto int, mode string, ctrlCtxFn func(context.Context, string, string, syscall.RawConn) error) (fd *netFD, err error) {
	switch runtime.GOOS {
	case "aix", "windows", "openbsd", "js", "wasip1":

		switch net {
		case "tcp4":
			if so.Cookie.Family() == syscall.AF_INET && so.Cookie.Type() == syscall.SOCK_STREAM {
				return nil, syscall.EHOSTUNREACH
			}
		case "udp4":
			if so.Cookie.Family() == syscall.AF_INET && so.Cookie.Type() == syscall.SOCK_DGRAM {
				return nil, syscall.EHOSTUNREACH
			}
		case "ip4":
			if so.Cookie.Family() == syscall.AF_INET && so.Cookie.Type() == syscall.SOCK_RAW {
				return nil, syscall.EHOSTUNREACH

	}
	return nil
}

func (a *UDPAddr) family() int {
	if a == nil || len(a.IP) <= IPv4len {
		return syscall.AF_INET
	}
	if a.IP.To4() != nil {
		return syscall.AF_INET
	}
	return syscall.AF_INET6
}

func (a *UDPAddr) sockaddr(family int) (syscall.Sockaddr, error) {
	if a == nil {
		return nil, nil
	}

	os.Exit(st)
}

func TestSwitch(t *testing.T) {
	const N = 10
	var wg sync.WaitGroup
	wg.Add(N)
	for i := 0; i < N; i++ {
		go func() {
			defer wg.Done()
			for _, family := range []int{syscall.AF_INET, syscall.AF_INET6} {
				socketFunc(family, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
			}
		}()
	}
	wg.Wait()
}

func TestSocket(t *testing.T) {
	for _, f := range []socktest.Filter{

}

// According to netdevice(7), only AF_INET addresses are returned for numerous
// sockaddr ioctls. For convenience, we expose these as Inet4Addr since the Port
// field and other data is always empty.

// Inet4Addr returns the Ifreq union data from an embedded sockaddr as a C
// in_addr/Go []byte (4-byte IPv4 address) value. If the sockaddr family is not
// AF_INET, an error is returned.

// license that can be found in the LICENSE file.

//go:build !netgo && darwin

package net

import (
	"internal/syscall/unix"
	"runtime"
	"syscall"
	"unsafe"
)

const (
	_C_AF_INET      = syscall.AF_INET
	_C_AF_INET6     = syscall.AF_INET6
	_C_AF_UNSPEC    = syscall.AF_UNSPEC
	_C_EAI_AGAIN    = unix.EAI_AGAIN
	_C_EAI_NONAME   = unix.EAI_NONAME
	_C_EAI_SERVICE  = unix.EAI_SERVICE
	_C_EAI_NODATA   = unix.EAI_NODATA

type Inet4Addr struct {
	IP        [4]byte // IP address
	PrefixLen int     // address prefix length
}

// Family implements the Family method of Addr interface.
func (a *Inet4Addr) Family() int { return syscall.AF_INET }

// An Inet6Addr represents an internet address for IPv6.
type Inet6Addr struct {
	IP        [16]byte // IP address
	PrefixLen int      // address prefix length
	ZoneID    int      // zone identifier
}

//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos

package nettest

import "syscall"

func supportsRawSocket() bool {
	for _, af := range []int{syscall.AF_INET, syscall.AF_INET6} {
		s, err := syscall.Socket(af, syscall.SOCK_RAW, 0)
		if err != nil {
			continue
		}
		syscall.Close(s)
		return true
	}
	return false

		sa.Data[i] = int8(b[i])
	}
	return sa, rsaAlignOf(l), nil
}

// parseSockaddrInet parses b as an internet socket address.
func parseSockaddrInet(b []byte, family byte) (Sockaddr, error) {
	switch family {
	case AF_INET:
		if len(b) < SizeofSockaddrInet4 {
			return nil, EINVAL
		}
		rsa := (*RawSockaddrAny)(unsafe.Pointer(&b[0]))
		return anyToSockaddr(rsa)
	case AF_INET6:
		if len(b) < SizeofSockaddrInet6 {

func (a *Inet4Addr) Family() int { return syscall.AF_INET }

func (a *Inet4Addr) lenAndSpace() (int, int) {
	return sizeofSockaddrInet, roundup(sizeofSockaddrInet)
}

func (a *Inet4Addr) marshal(b []byte) (int, error) {
	l, ll := a.lenAndSpace()
	if len(b) < ll {
		return 0, errShortBuffer
	}
	b[0] = byte(l)
	b[1] = syscall.AF_INET
	copy(b[4:8], a.IP[:])
	return ll, nil
}