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