Re: Write permission of a record

["Arnold, Ned D. via Tech-talk" <tech-talk@aps.anl.gov>]

> I would hope there is some field could be used to define the record as ‘read-only’,

The "rules" in channel access security can include a value from a process variable, so you could define a variable such that when "PV==1" then predesignated records could go to a "read-only" state. 

You can also write your own custom records that would have a "read-only" field, if that is what you really want, but for the standard records in EPICS base you would use channel access security. 

  Ned

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From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Zhang, Tong via Tech-talk <tech-talk@aps.anl.gov>
Sent: Monday, August 1, 2022 02:50 PM
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: Write permission of a record

 

Hi,

 

I know that channel access security can control the record write permission based on a wide range of rules, but I’m wondering if EPICS has some other way to control the write permission of a record generally from the record definition level? To make it clearer, I would hope there is some field could be used to define the record as ‘read-only’, that is all external CA put request should be denied, the data only could be updated through the internal device support.

 

Thanks,

Tong