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import signal import weakref from functools import wraps __unittest = True class _InterruptHandler(object): def __init__(self, default_handler): self.called = False self.original_handler = default_handler if isinstance(default_handler, int): if default_handler == signal.SIG_DFL: # Pretend it's signal.default_int_handler instead. default_handler = signal.default_int_handler elif default_handler == signal.SIG_IGN: # Not quite the same thing as SIG_IGN, but the closest we # can make it: do nothing. def default_handler(unused_signum, unused_frame): pass else: raise TypeError("expected SIGINT signal handler to be " "signal.SIG_IGN, signal.SIG_DFL, or a " "callable object") self.default_handler = default_handler def __call__(self, signum, frame): installed_handler = signal.getsignal(signal.SIGINT) if installed_handler is not self: # if we aren't the installed handler, then delegate immediately # to the default handler self.default_handler(signum, frame) if self.called: self.default_handler(signum, frame) self.called = True for result in _results.keys(): result.stop() _results = weakref.WeakKeyDictionary() def registerResult(result): _results[result] = 1 def removeResult(result): return bool(_results.pop(result, None)) _interrupt_handler = None def installHandler(): global _interrupt_handler if _interrupt_handler is None: default_handler = signal.getsignal(signal.SIGINT) _interrupt_handler = _InterruptHandler(default_handler) signal.signal(signal.SIGINT, _interrupt_handler) def removeHandler(method=None): if method is not None: @wraps(method) def inner(args, kwargs): initial = signal.getsignal(signal.SIGINT) removeHandler() try: return method(args, **kwargs) finally: signal.signal(signal.SIGINT, initial) return inner global _interrupt_handler if _interrupt_handler is not None: signal.signal(signal.SIGINT, _interrupt_handler.original_handler)