}
	return n, nil
}

func (fd *netFD) writeBuffers(buf *Buffers) (int64, error) {
	n, err := fd.pfd.Writev((*[][]byte)(buf))
	runtime.KeepAlive(fd)
	return n, wrapSyscallError("wsasend", err)
}

func (fd *netFD) accept() (*netFD, error) {
	s, rawsa, rsan, errcall, err := fd.pfd.Accept(func() (syscall.Handle, error) {
		return sysSocket(fd.family, fd.sotype, 0)
	})

	if err != nil {
		if errcall != "" {

	return ioctlPtr(fd, req, unsafe.Pointer(value))
}

// IoctlSetTermios performs an ioctl on fd with a *Termios.
//
// The req value will usually be TCSETA or TIOCSETA.
func IoctlSetTermios(fd int, req int, value *Termios) error {
	// TODO: if we get the chance, remove the req parameter.
	return ioctlPtr(fd, req, unsafe.Pointer(value))
}

// IoctlGetInt performs an ioctl operation which gets an integer value

	return ioctlPtr(fd, req, unsafe.Pointer(value))
}

// IoctlSetTermios performs an ioctl on fd with a *Termios.
//
// The req value will usually be TCSETA or TIOCSETA.
func IoctlSetTermios(fd int, req uint, value *Termios) error {
	// TODO: if we get the chance, remove the req parameter.
	return ioctlPtr(fd, req, unsafe.Pointer(value))
}

// IoctlGetInt performs an ioctl operation which gets an integer value

	"syscall"
	"testing"
	"unsafe"
)

type loggedFD struct {
	Net string
	FD  *poll.FD
	Err error
}

var (
	logMu     sync.Mutex
	loggedFDs map[syscall.Handle]*loggedFD
)

func logFD(net string, fd *poll.FD, err error) {
	logMu.Lock()
	defer logMu.Unlock()

	loggedFDs[fd.Sysfd] = &loggedFD{
		Net: net,
		FD:  fd,
		Err: err,
	}
}

func init() {

		return nil, syscall.EINVAL
	}
	return newRawConn(c.fd), nil
}

// ReadFromIP acts like ReadFrom but returns an IPAddr.
func (c *IPConn) ReadFromIP(b []byte) (int, *IPAddr, error) {
	if !c.ok() {
		return 0, nil, syscall.EINVAL
	}
	n, addr, err := c.readFrom(b)
	if err != nil {
		err = &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	return n, addr, err
}

		poll.CloseFunc(s)
		return nil, syscall.EPROTONOSUPPORT
	}
	fd, err := newFD(s, family, sotype, "")
	if err != nil {
		poll.CloseFunc(s)
		return nil, err
	}
	laddr := fd.addrFunc()(lsa)
	raddr := fd.addrFunc()(rsa)
	fd.net = laddr.Network()
	if err := fd.init(); err != nil {
		fd.Close()
		return nil, err
	}
	fd.setAddr(laddr, raddr)
	return fd, nil
}

func fileConn(f *os.File) (Conn, error) {

//sysnb	socket(domain int, typ int, proto int) (fd int, err error)
//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)

	_SYS_clone3     = 435
	_SYS_faccessat2 = 439
	_SYS_fchmodat2  = 452
)

//sys	Dup2(oldfd int, newfd int) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fstat(fd int, stat *Stat_t) (err error)
//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sysnb	Getegid() (egid int)
//sysnb	Geteuid() (euid int)
//sysnb	Getgid() (gid int)

//sys	Chroot(path string) (err error)
//sys	Close(fd int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	dup3(from int, to int, flags int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)
//sys	Fchmod(fd int, mode uint32) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Flock(fd int, how int) (err error)

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if d == 0 {
		d = defaultTCPKeepAliveInterval
	} else if d < 0 {
		return nil
	}

	// The kernel expects seconds so round to next highest second.
	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}