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Subject: Re: CA gatway runs away when zero length PV name in UDP search request
From: "Kasemir, Kay" <kasemirk@ornl.gov>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>, "shuei.yamada@gmail.com" <shuei.yamada@gmail.com>
Date: Thu, 27 Apr 2017 16:45:50 +0000
Hello:

> From: Shuei YAMADA <shuei.yamada@gmail.com>
..
> CAS:
> Apr 20 06:29:30 !!! Errlog message received (message is above)
> zero length PV name in UDP search request?
> ====
> The machine in the logfile, jkjnuc31.ccr.jkcont (we're using private
> network for accelerator control),  is one of our PCs running
> CS-Studio

At the SNS we have also seen this zero-length PV name message in the CA gateway log.

I've updated the vtype.pv layer in CSS to catch empty PV names.
Then I found that the EPICS PV Tree tool would indeed request empty PV names when you enter such an empty name, so that's now also been fixed.
There might be more tools in CSS that ended up requesting empty PVs, and since that was so far just passed on, we didn't notice.
See  https://github.com/ControlSystemStudio/cs-studio/issues/2199 for updates.

Thanks,
Kay

References:
CA gatway runs away when zero length PV name in UDP search request Shuei YAMADA

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