return nil, errMissingAddress
		}
	case "listen":
	default:
		return nil, errors.New("unknown mode: " + mode)
	}

	fd, err := socket(ctx, net, syscall.AF_UNIX, sotype, 0, false, laddr, raddr, ctxCtrlFn)
	if err != nil {
		return nil, err
	}
	return fd, nil
}

func sockaddrToUnix(sa syscall.Sockaddr) Addr {
	if s, ok := sa.(*syscall.SockaddrUnix); ok {