CODEWITHSUNDEEP
pythonpython-3.xcrashcode-cleanup
WoJ
WoJ

Reputation: 30035

How to clean up upon a crash?

I would like some clean-up activities to occur in case of crash of my program. I understand that some situations cannot be handled (a SIGKILL for instance) but I would like to cover as much as possible.

The atexit module was a good candidate but the docs explicitely state that

The functions registered via this module are not called when the program is killed by a signal not handled by Python, when a Python fatal internal error is detected, or when os._exit() is called.

Are there functions or python features which allow to handle sys.exit() and unhandled exceptions program terminations? (these are the main one I am concerned with)

Upvotes: 2

Views: 2258

Answers (1)

ForceBru
ForceBru

Reputation: 44888

SIGKILL cannot be handled, no matter what, your program is just terminated (killed violently), and you can do nothing about this.

The only thing you can do about SIGKILL is to look for data that needs to be cleaned up during the next launch of your program.

For other cases use atexit to handle Python's interpreter normal termination. If you've got some unhandled exceptions, see where they can occur and wrap these pieces of code in try/except blocks:

try:
    pass
except ValueError as e:
    pass
except:
    # catch other exceptions
    pass

To deal with sys.exit calls, you can wrap the entire program's starting point in a try/except block and catch the SystemExit exception:

try:
    # your program goes here
    # you're calling your functions from here, etc
except SystemExit:
    # do cleanup
    raise

Upvotes: 1

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