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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.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.default_handler)
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