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How to use _spawn_logging_subprocess method in autotest

Best Python code snippet using autotest_python

logging_manager.py

Source:logging_manager.py

...391        self._point_stream_handlers_to_copy()392    def stop_logging(self):393        super(_FdRedirectionStreamManager, self).stop_logging()394        self._restore_stream_handlers()395    def _spawn_logging_subprocess(self):396        """397        Spawn a subprocess to log all input to the logging module with the398        current settings, and direct output to it.399        """400        read_end, write_end = os.pipe()401        pid = os.fork()402        if pid: # parent403            os.close(read_end)404            os.dup2(write_end, self._fd) # point FD to the subprocess405            os.close(write_end)406            return pid407        else: # child408            try:409                os.close(write_end)410                # ensure this subprocess doesn't hold any pipes to others411                os.close(1)412                os.close(2)413                self._run_logging_subprocess(read_end) # never returns414            except:415                # don't let exceptions in the child escape416                try:417                    logging.exception('Logging subprocess died:')418                finally:419                    os._exit(1)420    def _run_logging_subprocess(self, read_fd):421        """422        Always run from a subprocess.  Read from read_fd and write to the423        logging module until EOF.424        """425        signal.signal(signal.SIGTERM, signal.SIG_DFL) # clear handler426        input_file = os.fdopen(read_fd, 'r')427        for line in iter(input_file.readline, ''):428            logging.log(self._level, line.rstrip('\n'))429        logging.debug('Logging subprocess finished')430        os._exit(0)431    def _context_id(self):432        return '%s_context' % id(self)433    def on_push_context(self, context):434        # adds a context dict for this stream, $id_context, with the following:435        # * old_fd: FD holding a copy of the managed FD before launching a new436        #   subprocess.437        # * child_pid: PID of the logging subprocess launched438        fd_copy = os.dup(self._fd)439        child_pid = self._spawn_logging_subprocess()440        my_context = {'old_fd': fd_copy, 'child_pid': child_pid}441        context[self._context_id()] = my_context442    def on_restore_context(self, context):443        my_context = context[self._context_id()]444        # shut down subprocess445        child_pid = my_context['child_pid']446        try:447            os.close(self._fd)448            os.waitpid(child_pid, 0)449        except OSError:450            logging.exception('Failed to cleanly shutdown logging subprocess:')451        # restore previous FD452        old_fd = my_context['old_fd']453        os.dup2(old_fd, self._fd)...

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