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      from tornado.tcpserver import TCPServer
      from tornado.iostream import StreamClosedError

      class EchoServer(TCPServer):
          async def handle_stream(self, stream, address):
              while True:
                  try:
                      data = await stream.read_until(b"\n") await
                      stream.write(data)
                  except StreamClosedError:
                      break

    To make this server serve SSL traffic, send the ``ssl_options`` keyword
    argument with an `ssl.SSLContext` object. For compatibility with older
    versions of Python ``ssl_options`` may also be a dictionary of keyword
    arguments for the `ssl.SSLContext.wrap_socket` method.::

       ssl_ctx = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
       ssl_ctx.load_cert_chain(os.path.join(data_dir, "mydomain.crt"),
                               os.path.join(data_dir, "mydomain.key"))
       TCPServer(ssl_options=ssl_ctx)

    `TCPServer` initialization follows one of three patterns:

    1. `listen`: single-process::

            async def main():
                server = TCPServer()
                server.listen(8888)
                await asyncio.Event.wait()

            asyncio.run(main())

       While this example does not create multiple processes on its own, when
       the ``reuse_port=True`` argument is passed to ``listen()`` you can run
       the program multiple times to create a multi-process service.

    2. `add_sockets`: multi-process::

            sockets = bind_sockets(8888)
            tornado.process.fork_processes(0)
            async def post_fork_main():
                server = TCPServer()
                server.add_sockets(sockets)
                await asyncio.Event().wait()
            asyncio.run(post_fork_main())

       The `add_sockets` interface is more complicated, but it can be used with
       `tornado.process.fork_processes` to run a multi-process service with all
       worker processes forked from a single parent.  `add_sockets` can also be
       used in single-process servers if you want to create your listening
       sockets in some way other than `~tornado.netutil.bind_sockets`.

       Note that when using this pattern, nothing that touches the event loop
       can be run before ``fork_processes``.

    3. `bind`/`start`: simple **deprecated** multi-process::

            server = TCPServer()
            server.bind(8888)
            server.start(0)  # Forks multiple sub-processes
            IOLoop.current().start()

       This pattern is deprecated because it requires interfaces in the
       `asyncio` module that have been deprecated since Python 3.10. Support for
       creating multiple processes in the ``start`` method will be removed in a
       future version of Tornado.

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        event loop if it is not already running.

        All arguments have the same meaning as in
        `tornado.netutil.bind_sockets`.

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        Address may be either an IP address or hostname.  If it's a hostname,
        the server will listen on all IP addresses associated with the name.
        Address may be an empty string or None to listen on all available
        interfaces.  Family may be set to either `socket.AF_INET` or
        `socket.AF_INET6` to restrict to IPv4 or IPv6 addresses, otherwise both
        will be used if available.

        The ``backlog`` argument has the same meaning as for `socket.listen
        <socket.socket.listen>`. The ``reuse_port`` argument has the same
        meaning as for `.bind_sockets`.

        This method may be called multiple times prior to `start` to listen on
        multiple ports or interfaces.

        .. versionchanged:: 4.4
           Added the ``reuse_port`` argument.

        .. versionchanged:: 6.2
           Added the ``flags`` argument to match `.bind_sockets`.

        .. deprecated:: 6.2
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        processes. If num_processes is given and > 1, we fork that
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        Since we use processes and not threads, there is no shared memory
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        module (or the ``autoreload=True`` option to `tornado.web.Application`
        which defaults to True when ``debug=True``).
        When using multiple processes, no IOLoops can be created or
        referenced until after the call to ``TCPServer.start(n)``.

        Values of ``num_processes`` other than 1 are not supported on Windows.

        The ``max_restarts`` argument is passed to `.fork_processes`.

        .. versionchanged:: 6.0

           Added ``max_restarts`` argument.

        .. deprecated:: 6.2
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        If this `TCPServer` is configured for SSL, ``handle_stream``
        may be called before the SSL handshake has completed. Use
        `.SSLIOStream.wait_for_handshake` if you need to verify the client's
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