Can plugin set exit code?

I'm working on:
https://bugzilla.redhat.com/show_bug.cgi?id=658210
and I wonder. Is it even possible to set exit code from yum plugin?

I find that I can register my function to atexit.register() or even use
close hook. But the question is can I set exit code there?
I find that I can use there
 sys.exit(-1)
but that is not nice, since I will not give chance to other plugins... :(

-- 
Miroslav Suchy
Red Hat Satellite Engineering