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                elif fd is not None:
                    faulthandler.dump_traceback(fd,
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                else:
                    faulthandler.dump_traceback(all_threads=True)

            class Waiter(Thread):
                # avoid blocking if the main thread raises an exception.
                daemon = True

                def __init__(self):
                    Thread.__init__(self)
                    self.running = Event()
                    self.stop = Event()

                def run(self):
                    self.running.set()
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            fd = {fd}

            def func(timeout, repeat, cancel, file, loops):
                for loop in range(loops):
                    faulthandler.dump_traceback_later(timeout, repeat=repeat, file=file)
                    if cancel:
                        faulthandler.cancel_dump_traceback_later()
                    time.sleep(timeout * 5)
                    faulthandler.cancel_dump_traceback_later()

            if filename:
                file = open(filename, "wb")
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            import faulthandler
            import os
            import signal
            import sys

            all_threads = {all_threads}
            signum = {signum:d}
            unregister = {unregister}
            chain = {chain}
            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,
                                  all_threads=all_threads, chain={chain})
            if unregister:
                faulthandler.unregister(signum)
            func(signum)
            if chain and not handler.called:
                if file is not None:
                    output = file
                else:
                    output = sys.stderr
                print("Error: signal handler not called!", file=output)
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