What does "drain.output" do?

[motoslide]

This is bugging me, and I cannot find an explanation elsewhere.
We recently upgraded an few existing Clients from OpenServer 5.0.x to OpenServer 6.0.0 (new hardware as well). We started to have printing issues where the last page or so (sometimes more, sometimes less) wouldn't print.
We've been using an in-house lp interface script for the past 15 years which is very basic.
Now, with OpenServer 6.0.0, I have to add the "drain.output" command at the end of the script. This is a very common process to run at end of most interface scripts, but I cannot find information of what it does.
We never needed it in the past.

 

[PHV]

In fact a simple sleep 10 should suffice as the goal is to maintain the file descriptors open while the last characters are sent to the printer.

Hope This Helps, PH.
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