unix_events.py 文件源码

def _sig_chld(self):
        try:
            self._do_waitpid_all()
        except Exception as exc:
            # self._loop should always be available here
            # as '_sig_chld' is added as a signal handler
            # in 'attach_loop'
            self._loop.call_exception_handler({
                'message': 'Unknown exception in SIGCHLD handler',
                'exception': exc,
            })