[CRIU] Signalling processes before CRIU/after unCRIU

[Alex/AT]

I do not know, if this was implemented or is in plans, but nevertheless  
(if implemented, feel free to kick me a bit):

It would be nice that CRIU sends some signal to the process it is dumping  
before state freeze (and then wait for signal to be handled), and just  
after state unfreeze. This will allow processes knowing about CRIU to  
close unnecessary descriptors and perform necessary housekeeping just  
before freeze, and then maybe reopen/redo something after unfreeze.

-- 
Regards,
Alexey Asemov
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