func Pipe(p []int) (err error) {
	if len(p) != 2 {
		return EINVAL
	}
	r, w, err := pipe()
	if err == nil {
		p[0], p[1] = r, w
	}
	return err
}

//sysnb	pipe2(p *[2]_C_int, flags int) (r int, w int, err error)

func Pipe2(p []int, flags int) (err error) {
	if len(p) != 2 {
		return EINVAL
	}
	var pp [2]_C_int

	if r1 == socket_error {
		if e1 != 0 {
			err = errnoErr(e1)
		} else {
			err = syscall.EINVAL
		}
	}
	return err
}

func WSARecvMsg(fd syscall.Handle, msg *WSAMsg, bytesReceived *uint32, overlapped *syscall.Overlapped, croutine *byte) error {
	err := loadWSASendRecvMsg()
	if err != nil {

		// pidfdFind. Return ECHILD for consistency with what the wait
		// syscall would return.
		return nil, NewSyscallError("wait", syscall.ECHILD)
	case statusReleased:
		return nil, syscall.EINVAL
	}
	defer p.handleTransientRelease()

	var (
		info   unix.SiginfoChild
		rusage syscall.Rusage
		e      syscall.Errno
	)
	for {

func initMPTCPavailable() {
	s, err := sysSocket(syscall.AF_INET, syscall.SOCK_STREAM, _IPPROTO_MPTCP)
	switch {
	case errors.Is(err, syscall.EPROTONOSUPPORT): // Not supported: >= v5.6
	case errors.Is(err, syscall.EINVAL): // Not supported: < v5.6
	case err == nil: // Supported and no error
		poll.CloseFunc(s)
		fallthrough
	default:
		// another error: MPTCP was not available but it might be later
		mptcpAvailable = true
	}

*/
import "C"

const (
	_EPERM     = C.EPERM
	_ENOENT    = C.ENOENT
	_EINTR     = C.EINTR
	_EAGAIN    = C.EAGAIN
	_ENOMEM    = C.ENOMEM
	_EACCES    = C.EACCES
	_EFAULT    = C.EFAULT
	_EINVAL    = C.EINVAL
	_ETIMEDOUT = C.ETIMEDOUT

	_PROT_NONE  = C.PROT_NONE
	_PROT_READ  = C.PROT_READ
	_PROT_WRITE = C.PROT_WRITE
	_PROT_EXEC  = C.PROT_EXEC

	_MAP_ANON      = C.MAP_ANONYMOUS
	_MAP_PRIVATE   = C.MAP_PRIVATE

	var v BpfVersion
	err := ioctlPtr(fd, BIOCVERSION, unsafe.Pointer(&v))
	if err != nil {
		return err
	}
	if v.Major != BPF_MAJOR_VERSION || v.Minor != BPF_MINOR_VERSION {
		return EINVAL
	}
	return nil
}

// Deprecated: Use golang.org/x/net/bpf instead.
func BpfHeadercmpl(fd int) (int, error) {
	var f int
	err := ioctlPtr(fd, BIOCGHDRCMPLT, unsafe.Pointer(&f))
	if err != nil {

	// TODO(panjf2000): run some tests to see if we should unlock the non-streams for splice.
	// Streams benefit the most from the splice(2), non-streams are not even supported in old kernels
	// where splice(2) will just return EINVAL; newer kernels support non-streams like UDP, but I really
	// doubt that splice(2) could help non-streams, cuz they usually send small frames respectively
	// and one splice call would result in one frame.

	select {
	case result, ok := <-listener.acceptCh:
		if ok {
			return result.conn, result.err
		}
	case <-listener.ctx.Done():
	}
	return nil, syscall.EINVAL
}

// Close - closes underneath all TCP listeners.
func (listener *httpListener) Close() (err error) {
	listener.ctxCanceler()

	for i := range listener.listeners {
		listener.listeners[i].Close()
	}

}

func Pipe(p []Handle) (err error) {
	if len(p) != 2 {
		return syscall.EINVAL
	}
	var r, w Handle
	e := CreatePipe(&r, &w, makeInheritSa(), 0)
	if e != nil {
		return e
	}
	p[0] = r
	p[1] = w
	return nil
}

func Utimes(path string, tv []Timeval) (err error) {
	if len(tv) != 2 {
		return syscall.EINVAL
	}
	pathp, e := UTF16PtrFromString(path)
	if e != nil {
		return e
	}

		}
		return 0, newDNSError(winError("getaddrinfow", e), network+"/"+service, "")
	}
	defer syscall.FreeAddrInfoW(result)
	if result == nil {
		return 0, newDNSError(syscall.EINVAL, network+"/"+service, "")
	}
	addr := unsafe.Pointer(result.Addr)
	switch result.Family {
	case syscall.AF_INET:
		a := (*syscall.RawSockaddrInet4)(addr)
		return int(syscall.Ntohs(a.Port)), nil