daemon.py 文件源码

def make_default_signal_map():
    """ Make the default signal map for this system.

        :return: A mapping from signal number to handler object.

        The signals available differ by system. The map will not contain
        any signals not defined on the running system.

        """
    name_map = {
        'SIGTSTP': None,
        'SIGTTIN': None,
        'SIGTTOU': None,
        'SIGTERM': 'terminate',
    }
    signal_map = dict(
        (getattr(signal, name), target)
        for (name, target) in name_map.items()
        if hasattr(signal, name))

    return signal_map