Re: Write permission of a record

[Andrew Johnson via Tech-talk <tech-talk at aps.anl.gov>]

    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.