UNIX Server answering SO Q http://stackoverflow.com/questions/30880183/how-to-identify-a-client-connected-to-af-unix-socket

echoserverunix.py

#!/usr/bin/env python


"""Simple UNIX Echo Server

This example shows how you can create a simple UNIX Server (an Echo Service)
utilizing the builtin Socket Components that the circuits library ships with.
"""


from circuits import handler, Debugger
from circuits.net.sockets import UNIXServer


class EchoServer(UNIXServer):

    @handler("connect")
    def on_connect(self, sock, *peer):
        print sock
        print sock.fileno()
        print peer

    @handler("read")
    def on_read(self, sock, data):
        """Read Event Handler

        This is fired by the underlying Socket Component when there has been
        new data read from the connected client.

        ..note :: By simply returning, client/server socket components listen
                  to ValueChagned events (feedback) to determine if a handler
                  returned some data and fires a subsequent Write event with
                  the value returned.
        """

        return data


# Start and "run" the system.
# Bind to a UNIX Socket at /tmp/test.sock
app = EchoServer("/tmp/test.sock")
Debugger().register(app)
app.run()