I'd like to emulate violent system shutdown, i.e., to get as close as possible to power outage on an application level. We are talking about C/C++ application on Linux. I need the application to terminate itself.

Currently, I see several options:

1. call exit()
2. call _exit()
3. call abort()
4. do division by zero or dereference NULL.
5. other options?

What is the best choice?

It is partly a duplicate of this question.