[cups.general] Finding out when a job has completed

[Tim Waugh]

I maintain a program that monitors the state of jobs a user has
submitted for printing.  I'd like it to be able to show a notification
that the job has completed -- but I need it to really be telling the
truth.

Is there any way to know for sure that all the pages have been printed,
and that the ink is now drying on the paper?

Even if I can only know this for sure in some very limited
circumstances, I'd like to know what I need to look for.

I know that IPP provides the job-media-sheets-completed job attribute.
Can this be relied upon if present, even if the remote IPP
implementation is a network print server connected to a real printer?

Tim.
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