Libvirt error handling.

        self.name = name

        self.type = u'kvm'

        # register libvirt error handler

        libvirt.registerErrorHandler(self.vir_error_cb, None)

        # libvirt event loop abstraction

        self.vir_event_loop = VirEventLoop(self.handler.main.evloop)

        # This tells libvirt what event loop implementation it

    def stop(self):

        self.vir_event_loop.stop()

        self.vir_con.close()

        # unregister callback

        try:

            self.vir_con.domainEventDeregister(self.vir_cb)

        except libvirt.libvirtError:

            # in case the libvirt connection is broken, it will raise the error

            pass

        ret = self.vir_con.close()

        logger.debug('Libvirt still handling %s ref connections', ret)

        # TODO delet objects

    def vir_error_cb(self, ctxt, err):

        """Libvirt error callback.

        See http://libvirt.org/errors.html for more informations.

        :param ctxt: arbitrary context data (not needed because context is

            givent by self

        :param err: libvirt error code

        """

        logger.error('Libvirt error %s', err)

    def vir_cb(self, conn, dom, event, detail, opaque):

        """Callback for libvirt event loop."""

        logger.debug('Received event %s on domain %s, detail %s', event,