User exit callback feature?

[abol-karimi]

Is it possible to give a callback that will be run at exit? I'm using custom mutators and crossovers, and I want to save their (random-number generators') state before Atheris exits. My goal is to be able to resume fuzzing from the saved state.

[jvoisin]

It's not possible, but since you have the input of the fuzzer, you should be able to reconstruct all the states, shouldn't you?

[abol-karimi]

Not sure what you mean by 'reconstruct'.

I run atheris with the max_total_time option, so I don't even know how many iterations will be run. I can wrap the callback functions (fuzz target, custom mutator, custom crossover) in callable objects which keep track of their state but then I have to save the state after each call of the fuzz target since I wouldn't know which iteration is the last one.