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Text File  |  2014-07-29  |  2KB  |  72 lines
  1. import signal
  2. import weakref
  3.  
  4. from functools import wraps
  5.  
  6. __unittest = True
  7.  
  8.  
  9. class _InterruptHandler(object):
  10.     def __init__(self, default_handler):
  11.         self.called = False
  12.         self.original_handler = default_handler
  13.         if isinstance(default_handler, int):
  14.             if default_handler == signal.SIG_DFL:
  15.                 # Pretend it's signal.default_int_handler instead.
  16.                 default_handler = signal.default_int_handler
  17.             elif default_handler == signal.SIG_IGN:
  18.                 # Not quite the same thing as SIG_IGN, but the closest we
  19.                 # can make it: do nothing.
  20.                 def default_handler(unused_signum, unused_frame):
  21.                     pass
  22.             else:
  23.                 raise TypeError("expected SIGINT signal handler to be "
  24.                                 "signal.SIG_IGN, signal.SIG_DFL, or a "
  25.                                 "callable object")
  26.         self.default_handler = default_handler
  27.  
  28.     def __call__(self, signum, frame):
  29.         installed_handler = signal.getsignal(signal.SIGINT)
  30.         if installed_handler is not self:
  31.             # if we aren't the installed handler, then delegate immediately
  32.             # to the default handler
  33.             self.default_handler(signum, frame)
  34.  
  35.         if self.called:
  36.             self.default_handler(signum, frame)
  37.         self.called = True
  38.         for result in _results.keys():
  39.             result.stop()
  40.  
  41. _results = weakref.WeakKeyDictionary()
  42. def registerResult(result):
  43.     _results[result] = 1
  44.  
  45. def removeResult(result):
  46.     return bool(_results.pop(result, None))
  47.  
  48. _interrupt_handler = None
  49. def installHandler():
  50.     global _interrupt_handler
  51.     if _interrupt_handler is None:
  52.         default_handler = signal.getsignal(signal.SIGINT)
  53.         _interrupt_handler = _InterruptHandler(default_handler)
  54.         signal.signal(signal.SIGINT, _interrupt_handler)
  55.  
  56.  
  57. def removeHandler(method=None):
  58.     if method is not None:
  59.         @wraps(method)
  60.         def inner(*args, **kwargs):
  61.             initial = signal.getsignal(signal.SIGINT)
  62.             removeHandler()
  63.             try:
  64.                 return method(*args, **kwargs)
  65.             finally:
  66.                 signal.signal(signal.SIGINT, initial)
  67.         return inner
  68.  
  69.     global _interrupt_handler
  70.     if _interrupt_handler is not None:
  71.         signal.signal(signal.SIGINT, _interrupt_handler.original_handler)
  72.