if err != nil {
			return ntotal, err
		}
		buf = buf[n:]
	}
	return ntotal, nil
}

// Call ConnectEx. This doesn't need any locking, since it is only
// called when the descriptor is first created. This is here rather
// 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 {