Source code for unittest.signals

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):
                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():

_results = weakref.WeakKeyDictionary()
[docs]def registerResult(result): _results[result] = 1
[docs]def removeResult(result): return bool(_results.pop(result, None))
_interrupt_handler = None
[docs]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)
[docs]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)