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import struct
import socket

SO_PEERCRED = 17
MAX_REQUEST_SIZE = 100

class Daemon(object):

    addr = '/tmp/foo.sock'
    sock = None

    def __init__(self):

        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.bind(self.addr)
        self.sock.listen(0)

    def start(self):

        while True:

            print "Waiting for client."
            (conn, addr) = self.sock.accept()

            while True:

                try:
                    creds = conn.getsockopt(socket.SOL_SOCKET, SO_PEERCRED, struct.calcsize('3i'))
                    print "dem creds: ", creds
                    request = conn.recv(MAX_REQUEST_SIZE)
                    conn.send("I got: %s" % request)

                except socket.error:
                    print "Client disconnected or connection fuckup."
                    break

daemon = Daemon()
daemon.start()