how to get called at shutdown

Hi all

I have a function I want to have called once at shutdown.  Can anyone
tell me a good way to do that?

I tried register_reboot_notifier() but for some reason I don't yet
understand my notification handler does not get called unless I use
shutdown with the -n (bypass init) option.  I would like something that
works regardless of the command used to reboot or shutdown.

Thanks,
Tania


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