// than in the net package so that it can use fd.wop.
func (fd *FD) ConnectEx(ra syscall.Sockaddr) error {
	o := &fd.wop
	o.sa = ra
	_, err := execIO(o, func(o *operation) error {
		return ConnectExFunc(o.fd.Sysfd, o.sa, nil, 0, nil, &o.o)
	})
	return err
}

func (fd *FD) acceptOne(s syscall.Handle, rawsa []syscall.RawSockaddrAny, o *operation) (string, error) {
	// Submit accept request.
	o.handle = s