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<== Date ==> <== Thread ==>
Subject: Re: Write permission of a record
From: Andrew Johnson via Tech-talk <tech-talk at aps.anl.gov>
To: "Zhang, Tong" <ZhangT at frib.msu.edu>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date: Mon, 1 Aug 2022 15:06:49 -0500
Hi Tong,

There is a field in every record type called DISP (Disable Put) which, when set to a non-zero value, prevents any other field of that record from being written to over Channel Access or PV Access. You can still write to the DISP field remotely though, and it doesn't prevent DB links from other records in the same IOC from changing any record fields though, so it might not be quite what you're after but it's pretty close.

- Andrew


On 8/1/22 2:50 PM, Zhang, Tong via Tech-talk wrote:

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


-- 
Complexity comes for free, Simplicity you have to work for.
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RE: Write permission of a record Zhang, Tong via Tech-talk
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Write permission of a record Zhang, Tong via Tech-talk
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