def setUp(self):
        if platformType == 'posix':
            self.originalHandler = signal.signal(signal.SIGCHLD, signal.SIG_DFL)
Clear the SIGCHLD handler, if there is one, to ensure an environment
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/internet/test/reactormixins.py/ReactorBuilder.setUp