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3

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            fd = {fd}

            def func(timeout, repeat, cancel, file, loops):
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                file = open(filename, "wb")
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            import sys

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            signum = {signum}
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            filename = {filename!r}
            fd = {fd}

            def func(signum):
                os.kill(os.getpid(), signum)

            def handler(signum, frame):
                handler.called = True
            handler.called = False

            if filename:
                file = open(filename, "wb")
            elif fd is not None:
                file = sys.stderr.fileno()
            else:
                file = None
            if chain:
                signal.signal(signum, handler)
            faulthandler.register(signum, file=file,
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            if unregister:
                faulthandler.unregister(signum)
            func(signum)
            if chain and not handler.called:
                if file is not None:
                    output = file
                else:
                    output = sys.stderr
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