Watch file descriptors

.. method:: BaseEventLoop.add_reader(fd, callback, \*args)

Start watching the file descriptor for read availability and then call the

*callback* with specified arguments.

.. method:: BaseEventLoop.remove_reader(fd)

Stop watching the file descriptor for read availability.

.. method:: BaseEventLoop.add_writer(fd, callback, \*args)

Start watching the file descriptor for write availability and then call the

*callback* with specified arguments.

.. method:: BaseEventLoop.remove_writer(fd)

Stop watching the file descriptor for write availability.

Low-level socket operations

.. method:: BaseEventLoop.sock_recv(sock, nbytes)

Receive data from the socket. The return value is a bytes object

representing the data received. The maximum amount of data to be received

at once is specified by *nbytes*.

This method returns a :ref:`coroutine object <coroutine>`.

.. seealso::

The :meth:`socket.socket.recv` method.

.. method:: BaseEventLoop.sock_sendall(sock, data)

Send data to the socket. The socket must be connected to a remote socket.

This method continues to send data from *data* until either all data has

been sent or an error occurs. ``None`` is returned on success. On error,

an exception is raised, and there is no way to determine how much data, if

any, was successfully sent.

This method returns a :ref:`coroutine object <coroutine>`.

.. seealso::

The :meth:`socket.socket.sendall` method.

.. method:: BaseEventLoop.sock_connect(sock, address)

Connect to a remote socket at *address*.

This method returns a :ref:`coroutine object <coroutine>`.

.. seealso::

The :meth:`BaseEventLoop.create_connection` method, the

:func:`open_connection` function and the :meth:`socket.socket.connect`

method.

.. method:: BaseEventLoop.sock_accept(sock)

Accept a connection. The socket must be bound to an address and listening

for connections. The return value is a pair ``(conn, address)`` where *conn*

is a *new* socket object usable to send and receive data on the connection,

and *address* is the address bound to the socket on the other end of the

connection.

This method returns a :ref:`coroutine object <coroutine>`.

.. seealso::

The :meth:`BaseEventLoop.create_server` method, the :func:`start_server`

function and the :meth:`socket.socket.accept` method.

Resolve host name

Similar to the :meth:`socket.getaddrinfo` function, but return a

:ref:`coroutine object <coroutine>`.

Similar to the :meth:`socket.getnameinfo` function, but return a

:ref:`coroutine object <coroutine>`.