Python errno.EALREADY Examples

def _connect(self, sock, sa):
        while not self._canceled and not ABORT_FLAG_FUNCTION():
            time.sleep(0.01)
            self._check_timeout()  # this should be done at the beginning of each loop
            status = sock.connect_ex(sa)
            if not status or status in (errno.EISCONN, WIN_EISCONN):
                break
            elif status in (errno.EINPROGRESS, WIN_EWOULDBLOCK):
                self.deadline = time.time() + self._timeout.getConnectTimeout()
            # elif status in (errno.EWOULDBLOCK, errno.EALREADY) or (os.name == 'nt' and status == errno.WSAEINVAL):
            #     pass
            yield

        if self._canceled or ABORT_FLAG_FUNCTION():
            raise CanceledException('Request canceled')

        error = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
        if error:
            # TODO: determine when this case can actually happen
            raise socket.error((error,)) 

def __init__ (self):
		self.sock = None		# socket object
		self.send_buf = []		# send buffer
		self.recv_buf = []		# recv buffer
		self.pend_buf = ''		# send pending
		self.state = NET_STATE_CLOSED
		self.errd = [ errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK ]
		self.conn = ( errno.EISCONN, 10057, 10053 )
		self.errc = 0
		self.ipv6 = False
		self.eintr = ()
		if 'EINTR' in errno.__dict__:
			self.eintr = (errno.__dict__['EINTR'],)
		if 'WSAEWOULDBLOCK' in errno.__dict__:
			self.errd.append(errno.WSAEWOULDBLOCK)
		self.errd = tuple(self.errd)
		self.timeout = 0
		self.timecon = 0 

def _whois(self):
        def alrmhandler(signum,frame):
            raise "TimedOut", "on connect"

        s = None

        ## try until we timeout
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        if HAS_ALARM:
            s.setblocking(0)
            signal.signal(signal.SIGALRM,alrmhandler)
            signal.alarm(timeout)
        while 1:	
            try:
                s.connect((self.whoisserver, 43))
            except socket.error, (ecode, reason):
                if ecode==errno.EINPROGRESS: 
                    continue
                elif ecode==errno.EALREADY:
                    continue
                else:
                    raise socket.error, (ecode, reason)
                pass

            break 

def reset_input_buffer(self):
        """Clear input buffer, discarding all that is in the buffer."""
        if not self.is_open:
            raise portNotOpenError

        # just use recv to remove input, while there is some
        ready = True
        while ready:
            ready, _, _ = select.select([self._socket], [], [], 0)
            try:
                self._socket.recv(4096)
            except OSError as e:
                # this is for Python 3.x where select.error is a subclass of
                # OSError ignore BlockingIOErrors and EINTR. other errors are shown
                # https://www.python.org/dev/peps/pep-0475.
                if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
                    raise SerialException('read failed: {}'.format(e))
            except (select.error, socket.error) as e:
                # this is for Python 2.x
                # ignore BlockingIOErrors and EINTR. all errors are shown
                # see also http://www.python.org/dev/peps/pep-3151/#select
                if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
                    raise SerialException('read failed: {}'.format(e)) 

def _whois(self):
        def alrmhandler(signum,frame):
            raise "TimedOut", "on connect"

        s = None

        ## try until we timeout
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        if HAS_ALARM:
            s.setblocking(0)
            signal.signal(signal.SIGALRM,alrmhandler)
            signal.alarm(timeout)
        while 1:	
            try:
                s.connect((self.whoisserver, 43))
            except socket.error, (ecode, reason):
                if ecode==errno.EINPROGRESS: 
                    continue
                elif ecode==errno.EALREADY:
                    continue
                else:
                    raise socket.error, (ecode, reason)
                pass

            break 

def test_connect_ex_workout(self):
        """Verify connect_ex states go through EINPROGRESS?, EALREADY*, EISCONN"""
        # Tests fix for http://bugs.jython.org/issue2428; based in part on the
        # code showing failure that was submitted with that bug
        for result in self.do_workout():
            self.assertIn(result[0], {errno.EINPROGRESS, errno.EISCONN})
            self.assertEqual(result[-1], errno.EISCONN)
            for code in result[1:-1]:
                self.assertEqual(code, errno.EALREADY) 

def test_non_blocking_connect_ex(self):
        # Issue #11326: non-blocking connect_ex() should allow handshake
        # to proceed after the socket gets ready.
        with support.transient_internet(REMOTE_HOST):
            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
                                cert_reqs=ssl.CERT_REQUIRED,
                                ca_certs=REMOTE_ROOT_CERT,
                                do_handshake_on_connect=False)
            try:
                s.setblocking(False)
                rc = s.connect_ex((REMOTE_HOST, 443))
                # EWOULDBLOCK under Windows, EINPROGRESS elsewhere
                # Jython added EALREADY, as in Jython connect may have already happened
                self.assertIn(rc, (0, errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK))
                # Wait for connect to finish
                select.select([], [s], [], 5.0)
                # Non-blocking handshake
                while True:
                    try:
                        s.do_handshake()
                        break
                    except ssl.SSLWantReadError:
                        select.select([s], [], [], 5.0)
                    except ssl.SSLWantWriteError:
                        select.select([], [s], [], 5.0)
                # SSL established
                #self.assertTrue(s.getpeercert())
            finally:
                s.close() 

def test_connect_ex_workout(self):
        """Verify connect_ex states go through EINPROGRESS?, EALREADY*, EISCONN"""
        # Tests fix for http://bugs.jython.org/issue2428; based in part on the
        # code showing failure that was submitted with that bug
        for result in self.do_workout():
            self.assertIn(result[0], {errno.EINPROGRESS, errno.EISCONN})
            self.assertEqual(result[-1], errno.EISCONN)
            for code in result[1:-1]:
                self.assertEqual(code, errno.EALREADY) 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def open(self):
        """
        Opens connection to the target. Make sure to call close!

        Returns:
            None
        """

        try:
            if self._active_session is False:
                self._client = telnetlib.Telnet(self.host, port=self.port, timeout=self.timeout)
                self._client.read_until(b'User name:')
                self._client.write(self.username + b'\r\n')
                self._client.read_until(b'User password:')
                self._client.write(self.password + b'\r\n')
                m = self._client.read_until(b'>')  # Todo: Implementation dependant
                self._active_session = True

        except socket.error as e:
            self._active_session = False
            if e.errno == errno.ECONNREFUSED:
                # raise exception.FuzzowskiTargetConnectionFailedError(e.message)
                raise exception.FuzzowskiTargetConnectionFailedError('ECONNREFUSED')
            elif e.errno == errno.EALREADY:
                raise exception.FuzzowskiTargetConnectionFailedError('EALREADY')
            elif e.errno == errno.EINPROGRESS:
                raise exception.FuzzowskiTargetConnectionFailedError('EINPROGRESS')
            else:
                raise
        except OSError as e:
            raise exception.FuzzowskiTargetConnectionFailedError(errno.errorcode(e.errno)) 

def read(self, size=1):
        """\
        Read size bytes from the serial port. If a timeout is set it may
        return less characters as requested. With no timeout it will block
        until the requested number of bytes is read.
        """
        if not self.is_open:
            raise portNotOpenError
        read = bytearray()
        timeout = Timeout(self._timeout)
        while len(read) < size:
            try:
                ready, _, _ = select.select([self._socket], [], [], timeout.time_left())
                # If select was used with a timeout, and the timeout occurs, it
                # returns with empty lists -> thus abort read operation.
                # For timeout == 0 (non-blocking operation) also abort when
                # there is nothing to read.
                if not ready:
                    break   # timeout
                buf = self._socket.recv(size - len(read))
                # read should always return some data as select reported it was
                # ready to read when we get to this point, unless it is EOF
                if not buf:
                    raise SerialException('socket disconnected')
                read.extend(buf)
            except OSError as e:
                # this is for Python 3.x where select.error is a subclass of
                # OSError ignore BlockingIOErrors and EINTR. other errors are shown
                # https://www.python.org/dev/peps/pep-0475.
                if e.errno not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
                    raise SerialException('read failed: {}'.format(e))
            except (select.error, socket.error) as e:
                # this is for Python 2.x
                # ignore BlockingIOErrors and EINTR. all errors are shown
                # see also http://www.python.org/dev/peps/pep-3151/#select
                if e[0] not in (errno.EAGAIN, errno.EALREADY, errno.EWOULDBLOCK, errno.EINPROGRESS, errno.EINTR):
                    raise SerialException('read failed: {}'.format(e))
            if timeout.expired():
                break
        return bytes(read) 

def connect_ex(self, addr):
        was_connecting = self.connected  # actually means self.connecting if
                                         # not blocking
        if not self.connected:
            try:
                self.connect(addr)
            except error as e:
                return e.errno
        if not self.connect_future.isDone():
            if was_connecting:
                try:
                    # Timing is based on CPython and was empirically
                    # guesstimated. Of course this means user code is
                    # polling, so the the best we can do is wait like
                    # this in supposedly nonblocking mode without
                    # completely busy waiting!
                    self.connect_future.get(1500, TimeUnit.MICROSECONDS)
                except ExecutionException:
                    # generally raised if closed; pick up the state
                    # when testing for success
                    pass
                except TimeoutException:
                    # more than 1.5ms, will report EALREADY below
                    pass

        if not self.connect_future.isDone():
            if was_connecting:
                return errno.EALREADY
            else:
                return errno.EINPROGRESS
        elif self.connect_future.isSuccess():
            # from socketmodule.c
            # if (res == EISCONN)
            #   res = 0;
            # but http://bugs.jython.org/issue2428
            return errno.EISCONN
        else:
            return errno.ENOTCONN

    # SERVER METHODS
    # Calling listen means this is a server socket 

def connect_ex(self, addr):
        was_connecting = self.connected  # actually means self.connecting if
                                         # not blocking
        if not self.connected:
            try:
                self.connect(addr)
            except error as e:
                return e.errno
        if not self.connect_future.isDone():
            if was_connecting:
                try:
                    # Timing is based on CPython and was empirically
                    # guesstimated. Of course this means user code is
                    # polling, so the the best we can do is wait like
                    # this in supposedly nonblocking mode without
                    # completely busy waiting!
                    self.connect_future.get(1500, TimeUnit.MICROSECONDS)
                except ExecutionException:
                    # generally raised if closed; pick up the state
                    # when testing for success
                    pass
                except TimeoutException:
                    # more than 1.5ms, will report EALREADY below
                    pass

        if not self.connect_future.isDone():
            if was_connecting:
                return errno.EALREADY
            else:
                return errno.EINPROGRESS
        elif self.connect_future.isSuccess():
            # from socketmodule.c
            # if (res == EISCONN)
            #   res = 0;
            # but http://bugs.jython.org/issue2428
            return errno.EISCONN
        else:
            return errno.ENOTCONN

    # SERVER METHODS
    # Calling listen means this is a server socket 

def test_non_blocking_connect_ex(self):
        # Issue #11326: non-blocking connect_ex() should allow handshake
        # to proceed after the socket gets ready.
        with support.transient_internet(REMOTE_HOST):
            s = ssl.wrap_socket(socket.socket(socket.AF_INET),
                                cert_reqs=ssl.CERT_REQUIRED,
                                ca_certs=REMOTE_ROOT_CERT,
                                do_handshake_on_connect=False)
            try:
                s.setblocking(False)
                rc = s.connect_ex((REMOTE_HOST, 443))
                # EWOULDBLOCK under Windows, EINPROGRESS elsewhere
                # Jython added EALREADY, as in Jython connect may have already happened
                self.assertIn(rc, (0, errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK))
                # Wait for connect to finish
                select.select([], [s], [], 5.0)
                # Non-blocking handshake
                while True:
                    try:
                        s.do_handshake()
                        break
                    except ssl.SSLWantReadError:
                        select.select([s], [], [], 5.0)
                    except ssl.SSLWantWriteError:
                        select.select([], [s], [], 5.0)
                # SSL established
                #self.assertTrue(s.getpeercert())
            finally:
                s.close() 

def test_connect_ex_workout(self):
        """Verify connect_ex states go through EINPROGRESS?, EALREADY*, EISCONN"""
        # Tests fix for http://bugs.jython.org/issue2428; based in part on the
        # code showing failure that was submitted with that bug
        for result in self.do_workout():
            self.assertIn(result[0], {errno.EINPROGRESS, errno.EISCONN})
            self.assertEqual(result[-1], errno.EISCONN)
            for code in result[1:-1]:
                self.assertEqual(code, errno.EALREADY) 

def test_connect_ex_workout(self):
        """Verify connect_ex states go through EINPROGRESS?, EALREADY*, EISCONN"""
        # Tests fix for http://bugs.jython.org/issue2428; based in part on the
        # code showing failure that was submitted with that bug
        for result in self.do_workout():
            self.assertIn(result[0], {errno.EINPROGRESS, errno.EISCONN})
            self.assertEqual(result[-1], errno.EISCONN)
            for code in result[1:-1]:
                self.assertEqual(code, errno.EALREADY) 

def connect_ex(self, addr):
        was_connecting = self.connected  # actually means self.connecting if
                                         # not blocking
        if not self.connected:
            try:
                self.connect(addr)
            except error as e:
                return e.errno
        if not self.connect_future.isDone():
            if was_connecting:
                try:
                    # Timing is based on CPython and was empirically
                    # guesstimated. Of course this means user code is
                    # polling, so the the best we can do is wait like
                    # this in supposedly nonblocking mode without
                    # completely busy waiting!
                    self.connect_future.get(1500, TimeUnit.MICROSECONDS)
                except ExecutionException:
                    # generally raised if closed; pick up the state
                    # when testing for success
                    pass
                except TimeoutException:
                    # more than 1.5ms, will report EALREADY below
                    pass

        if not self.connect_future.isDone():
            if was_connecting:
                return errno.EALREADY
            else:
                return errno.EINPROGRESS
        elif self.connect_future.isSuccess():
            # from socketmodule.c
            # if (res == EISCONN)
            #   res = 0;
            # but http://bugs.jython.org/issue2428
            return errno.EISCONN
        else:
            return errno.ENOTCONN

    # SERVER METHODS
    # Calling listen means this is a server socket 

def connect_ex(self, addr):
        was_connecting = self.connected  # actually means self.connecting if
                                         # not blocking
        if not self.connected:
            try:
                self.connect(addr)
            except error as e:
                return e.errno
        if not self.connect_future.isDone():
            if was_connecting:
                try:
                    # Timing is based on CPython and was empirically
                    # guesstimated. Of course this means user code is
                    # polling, so the the best we can do is wait like
                    # this in supposedly nonblocking mode without
                    # completely busy waiting!
                    self.connect_future.get(1500, TimeUnit.MICROSECONDS)
                except ExecutionException:
                    # generally raised if closed; pick up the state
                    # when testing for success
                    pass
                except TimeoutException:
                    # more than 1.5ms, will report EALREADY below
                    pass

        if not self.connect_future.isDone():
            if was_connecting:
                return errno.EALREADY
            else:
                return errno.EINPROGRESS
        elif self.connect_future.isSuccess():
            # from socketmodule.c
            # if (res == EISCONN)
            #   res = 0;
            # but http://bugs.jython.org/issue2428
            return errno.EISCONN
        else:
            return errno.ENOTCONN

    # SERVER METHODS
    # Calling listen means this is a server socket 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def connect(self, *addr):
        timeout = self.timeout
        sock = self.sock
        try:
            # Non-blocking mode
            sock.setblocking(0)
            apply(sock.connect, addr)
            sock.setblocking(timeout != 0)
            return 1
        except socket.error,why:
            if not timeout:
                raise
            sock.setblocking(1)
            if len(why.args) == 1:
                code = 0
            else:
                code, why = why
            if code not in (
                errno.EINPROGRESS, errno.EALREADY, errno.EWOULDBLOCK
                ):
                raise
            r,w,e = select.select([],[sock],[],timeout)
            if w:
                try:
                    apply(sock.connect, addr)
                    return 1
                except socket.error,why:
                    if len(why.args) == 1:
                        code = 0
                    else:
                        code, why = why
                    if code in (errno.EISCONN, WSAEINVAL):
                        return 1
                    raise 

def toggle_device(dev_id, enable):
    """
    Power ON or OFF a bluetooth device.

    :param dev_id: Device id.
    :type dev_id: ``int``
    :param enable: Whether to enable of disable the device.
    :type enable: ``bool``
    """
    hci_sock = socket.socket(socket.AF_BLUETOOTH,
                             socket.SOCK_RAW,
                             socket.BTPROTO_HCI)
    # print("Power %s bluetooth device %d" % ('ON' if enable else 'OFF', dev_id))
    # di = struct.pack("HbBIBBIIIHHHH10I", dev_id, *((0,) * 22))
    # fcntl.ioctl(hci_sock.fileno(), bluez.HCIGETDEVINFO, di)
    req_str = struct.pack("H", dev_id)
    request = array.array("b", req_str)
    try:
        fcntl.ioctl(hci_sock.fileno(),
                    bluez.HCIDEVUP if enable else bluez.HCIDEVDOWN,
                    request[0])
    except IOError as e:
        if e.errno == EALREADY:
            pass
            # print("Bluetooth device %d is already %s" % (
            #       dev_id, 'enabled' if enable else 'disabled'))
        else:
            raise
    finally:
        hci_sock.close()


# Types of bluetooth scan 

def toggle_device(dev_id, enable):
    """
    Power ON or OFF a bluetooth device.

    :param dev_id: Device id.
    :type dev_id: ``int``
    :param enable: Whether to enable of disable the device.
    :type enable: ``bool``
    """
    hci_sock = socket.socket(socket.AF_BLUETOOTH,
                             socket.SOCK_RAW,
                             socket.BTPROTO_HCI)
    # print("Power %s bluetooth device %d" % ('ON' if enable else 'OFF', dev_id))
    # di = struct.pack("HbBIBBIIIHHHH10I", dev_id, *((0,) * 22))
    # fcntl.ioctl(hci_sock.fileno(), bluez.HCIGETDEVINFO, di)
    req_str = struct.pack("H", dev_id)
    request = array.array("b", req_str)
    try:
        fcntl.ioctl(hci_sock.fileno(),
                    bluez.HCIDEVUP if enable else bluez.HCIDEVDOWN,
                    request[0])
    except IOError as e:
        if e.errno == EALREADY:
            pass
            # print("Bluetooth device %d is already %s" % (
            #       dev_id, 'enabled' if enable else 'disabled'))
        else:
            raise
    finally:
        hci_sock.close()


# Types of bluetooth scan 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]

        if hasattr(v, 'errno'):
            v_err = v.errno
        else:
            v_err = v[0]
        if v_err not in [errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EALREADY]:
            raise v 

def toggle_device(dev_id, enable):
    """
    Power ON or OFF a bluetooth device.

    :param dev_id: Device id.
    :type dev_id: ``int``
    :param enable: Whether to enable of disable the device.
    :type enable: ``bool``
    """
    hci_sock = socket.socket(socket.AF_BLUETOOTH,
                             socket.SOCK_RAW,
                             socket.BTPROTO_HCI)
    print("Power %s bluetooth device %d" % ('ON' if enable else 'OFF', dev_id))
    # di = struct.pack("HbBIBBIIIHHHH10I", dev_id, *((0,) * 22))
    # fcntl.ioctl(hci_sock.fileno(), bluez.HCIGETDEVINFO, di)
    req_str = struct.pack("H", dev_id)
    request = array.array("b", req_str)
    try:
        fcntl.ioctl(hci_sock.fileno(),
                    bluez.HCIDEVUP if enable else bluez.HCIDEVDOWN,
                    request[0])
    except IOError as e:
        if e.errno == EALREADY:
            print("Bluetooth device %d is already %s" % (
                  dev_id, 'enabled' if enable else 'disabled'))
        else:
            raise
    finally:
        hci_sock.close()


# Types of bluetooth scan 

def _connect(s, address):
    try:
        s.connect(address)
    except socket.error:
        (ty, v) = sys.exc_info()[:2]
        if v[0] != errno.EINPROGRESS and \
               v[0] != errno.EWOULDBLOCK and \
               v[0] != errno.EALREADY:
            raise v 

def doConnect(self):
        """
        Initiate the outgoing connection attempt.

        @note: Applications do not need to call this method; it will be invoked
            internally as part of L{IReactorTCP.connectTCP}.
        """
        self.doWrite = self.doConnect
        self.doRead = self.doConnect
        if not hasattr(self, "connector"):
            # this happens when connection failed but doConnect
            # was scheduled via a callLater in self._finishInit
            return

        err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
        if err:
            self.failIfNotConnected(error.getConnectError((err, strerror(err))))
            return

        # doConnect gets called twice.  The first time we actually need to
        # start the connection attempt.  The second time we don't really
        # want to (SO_ERROR above will have taken care of any errors, and if
        # it reported none, the mere fact that doConnect was called again is
        # sufficient to indicate that the connection has succeeded), but it
        # is not /particularly/ detrimental to do so.  This should get
        # cleaned up some day, though.
        try:
            connectResult = self.socket.connect_ex(self.realAddress)
        except socket.error as se:
            connectResult = se.args[0]
        if connectResult:
            if connectResult == EISCONN:
                pass
            # on Windows EINVAL means sometimes that we should keep trying:
            # http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winsock/winsock/connect_2.asp
            elif ((connectResult in (EWOULDBLOCK, EINPROGRESS, EALREADY)) or
                  (connectResult == EINVAL and platformType == "win32")):
                self.startReading()
                self.startWriting()
                return
            else:
                self.failIfNotConnected(error.getConnectError((connectResult, strerror(connectResult))))
                return

        # If I have reached this point without raising or returning, that means
        # that the socket is connected.
        del self.doWrite
        del self.doRead
        # we first stop and then start, to reset any references to the old doRead
        self.stopReading()
        self.stopWriting()
        self._connectDone() 

def connect(self, dest):
        with self.lock:
            if not self.state.CLOSED:
                self.err("connect() in socket state {0}".format(self.state))
                if self.state.ESTABLISHED:
                    raise err.Error(errno.EISCONN)
                if self.state.CONNECT:
                    raise err.Error(errno.EALREADY)
                raise err.Error(errno.EPIPE)
            if isinstance(dest, (bytes, bytearray)):
                send_pdu = pdu.Connect(1, self.addr, self.recv_miu,
                                       self.recv_win, bytes(dest))
            elif isinstance(dest, str):
                send_pdu = pdu.Connect(1, self.addr, self.recv_miu,
                                       self.recv_win, dest.encode('latin'))
            elif isinstance(dest, int):
                send_pdu = pdu.Connect(dest, self.addr, self.recv_miu,
                                       self.recv_win)
            else:
                raise TypeError("connect destination must be int or bytes")

            self.state.CONNECT = True
            self.send_queue.append(send_pdu)

            try:
                rcvd_pdu = super(DataLinkConnection, self).recv()
            except IndexError:
                raise err.Error(errno.EPIPE)

            if rcvd_pdu.name == "DM":
                logstr = "connect rejected with reason {}"
                self.log(logstr.format(rcvd_pdu.reason))
                self.state.CLOSED = True
                raise err.ConnectRefused(rcvd_pdu.reason)
            elif rcvd_pdu.name == "CC":
                self.peer = rcvd_pdu.ssap
                self.recv_buf = self.recv_win
                self.send_miu = rcvd_pdu.miu
                self.send_win = rcvd_pdu.rw
                self.state.ESTABLISHED = True
                return
            else:  # pragma: no cover
                raise RuntimeError("CC or DM expected, not " + rcvd_pdu.name)