'@param reactor: An L{IReactorUNIX} provider.
@param address: The path to the Unix socket file, used when listening
@param backlog: number of connections to allow in backlog.
@param mode: mode to set on the unix socket.  This parameter is
deprecated.  Permissions should be set on the directory which
contains the UNIX socket.
@param wantPID: If True, create a pidfile for the socket.'

def __init__(self, reactor, address, backlog=50, mode=438, wantPID=0):

    self._reactor = reactor
    self._address = address
    self._backlog = backlog
    self._mode = mode
    self._wantPID = wantPID
