{"tcp", "", "tcp", "", syscall.EADDRINUSE},
	{"tcp", "", "tcp", "0.0.0.0", syscall.EADDRINUSE},
	{"tcp", "0.0.0.0", "tcp", "", syscall.EADDRINUSE},

	{"tcp", "", "tcp", "::", syscall.EADDRINUSE},
	{"tcp", "::", "tcp", "", syscall.EADDRINUSE},
	{"tcp", "0.0.0.0", "tcp", "::", syscall.EADDRINUSE},
	{"tcp", "::", "tcp", "0.0.0.0", syscall.EADDRINUSE},
	{"tcp", "::ffff:0.0.0.0", "tcp", "::", syscall.EADDRINUSE},

	// to port exhaustion, which (for POSIX-like socket APIs) should return
	// an EADDRINUSE error.
	c, err := Dial(ln.Addr().Network(), ln.Addr().String())
	if err == nil {
		c.Close()
	}
	if errors.Is(err, syscall.EADDRINUSE) {
		t.Logf("Dial returned expected error: %v", err)
	} else {
		t.Errorf("unexpected error from Dial: %v\nwant: %v", err, syscall.EADDRINUSE)
	}

	// Opening a Listener should fail at this point too.

//go:build wasip1

package syscall

import "runtime"

// TODO: Auto-generate some day. (Hard-coded in binaries so not likely to change.)
const (
	E2BIG           Errno = 1
	EACCES          Errno = 2
	EADDRINUSE      Errno = 3
	EADDRNOTAVAIL   Errno = 4
	EAFNOSUPPORT    Errno = 5
	EAGAIN          Errno = 6
	EALREADY        Errno = 7
	EBADF           Errno = 8
	EBADMSG         Errno = 9
	EBUSY           Errno = 10

// Windows reserves errors >= 1<<29 for application use.
const APPLICATION_ERROR = 1 << 29

// Invented values to support what package os and others expects.
const (
	E2BIG Errno = APPLICATION_ERROR + iota
	EACCES
	EADDRINUSE
	EADDRNOTAVAIL
	EADV
	EAFNOSUPPORT
	EAGAIN
	EALREADY
	EBADE
	EBADF
	EBADFD
	EBADMSG
	EBADR
	EBADRQC
	EBADSLT
	EBFONT
	EBUSY
	ECANCELED
	ECHILD
	ECHRNG
	ECOMM

	"EPROTONOSUPPORT": EPROTONOSUPPORT,
	"ESOCKTNOSUPPORT": ESOCKTNOSUPPORT,
	"EOPNOTSUPP":      EOPNOTSUPP,
	"EPFNOSUPPORT":    EPFNOSUPPORT,
	"EAFNOSUPPORT":    EAFNOSUPPORT,
	"EADDRINUSE":      EADDRINUSE,
	"EADDRNOTAVAIL":   EADDRNOTAVAIL,
	"ENETDOWN":        ENETDOWN,
	"ENETUNREACH":     ENETUNREACH,
	"ENETRESET":       ENETRESET,
	"ECONNABORTED":    ECONNABORTED,
	"ECONNRESET":      ECONNRESET,

//go:build unix

package net

import (
	"context"
	"errors"
	"syscall"
	"testing"
	"time"
)

func init() {
	isEADDRINUSE = func(err error) bool {
		return errors.Is(err, syscall.EADDRINUSE)
	}
}

// Issue 16523
func TestDialContextCancelRace(t *testing.T) {
	oldConnectFunc := connectFunc
	oldGetsockoptIntFunc := getsockoptIntFunc
	oldTestHookCanceledDial := testHookCanceledDial
	defer func() {

		fd.fakeNetFD = nil
		return wrapErr(syscall.EADDRINUSE)
	}

	return nil
}

func fakeConnect(ctx context.Context, fd *netFD, laddr, raddr sockaddr) error {
	wrapErr := func(err error) error {
		if errno, ok := err.(syscall.Errno); ok {
			err = os.NewSyscallError("connect", errno)
		}
		if errors.Is(err, syscall.EADDRINUSE) {
			return err
		}

		return Err{}
	}

	// If this is already a Err, do nothing
	if e, ok := err.(Err); ok {
		return e
	}

	// Show a generic message for known golang errors
	if errors.Is(err, syscall.EADDRINUSE) {
		return ErrPortAlreadyInUse(err).Msg("Specified port is already in use")
	} else if errors.Is(err, syscall.EACCES) || errors.Is(err, syscall.EPERM) {
		if netErr, ok := err.(*net.OpError); ok {

	_HIDIOCGRAWNAME                  = 0x80804804
	_HIDIOCGRAWPHYS                  = 0x80404805
	_HIDIOCGRAWUNIQ                  = 0x80404808
)

// Errors
const (
	EADDRINUSE      = syscall.Errno(0x62)
	EADDRNOTAVAIL   = syscall.Errno(0x63)
	EADV            = syscall.Errno(0x44)
	EAFNOSUPPORT    = syscall.Errno(0x61)
	EALREADY        = syscall.Errno(0x72)

	_HIDIOCGRAWNAME                  = 0x80804804
	_HIDIOCGRAWPHYS                  = 0x80404805
	_HIDIOCGRAWUNIQ                  = 0x80404808
)

// Errors
const (
	EADDRINUSE      = syscall.Errno(0x62)
	EADDRNOTAVAIL   = syscall.Errno(0x63)
	EADV            = syscall.Errno(0x44)
	EAFNOSUPPORT    = syscall.Errno(0x61)
	EALREADY        = syscall.Errno(0x72)