Arguments:

* *protocol_factory* must be a callable returning a

:ref:`protocol <asyncio-protocol>` implementation.

* The *host* parameter can be set to several types which determine behavior:

- If *host* is a string, the TCP server is bound to *host* and *port*.

- if *host* is a sequence of strings, the TCP server is bound to all

:class:`str`, :class:`bytes`, and :class:`~pathlib.Path` paths

are supported.

See the documentation of the :meth:`loop.create_server` method

for information about arguments to this method.

Availability: UNIX.

.. versionadded:: 3.7

Parameters:

* *protocol_factory* must be a callable returning a

:ref:`protocol <asyncio-protocol>` implementation.

* *sock* is a preexisting socket object returned from

:meth:`socket.accept <socket.socket.accept>`.

*pipe* is a :term:`file-like object <file object>`.

Return pair ``(transport, protocol)``, where *transport* supports

the :class:`ReadTransport` interface.

the :class:`ReadTransport` interface and *protocol* is an object

instantiated by the *protocol_factory*.

With :class:`SelectorEventLoop` event loop, the *pipe* is set to

non-blocking mode.

*pipe* is :term:`file-like object <file object>`.

Return pair ``(transport, protocol)``, where *transport* supports

:class:`WriteTransport` interface.

:class:`WriteTransport` interface and *protocol* is an object

instantiated by the *protocol_factory*.

With :class:`SelectorEventLoop` event loop, the *pipe* is set to

non-blocking mode.

for documentation on other arguments.

Returns a pair of ``(transport, protocol)``, where *transport*

conforms to the :class:`asyncio.SubprocessTransport` base class.

conforms to the :class:`asyncio.SubprocessTransport` base class and

*protocol* is an object instantiated by the *protocol_factory*.

.. coroutinemethod:: loop.subprocess_shell(protocol_factory, cmd, \*, \

stdin=subprocess.PIPE, stdout=subprocess.PIPE, \

the remaining arguments.

Returns a pair of ``(transport, protocol)``, where *transport*

conforms to the :class:`SubprocessTransport` base class.

conforms to the :class:`SubprocessTransport` base class and

*protocol* is an object instantiated by the *protocol_factory*.

.. note::

It is the application's responsibility to ensure that all whitespace