Re: Process a record only when IOC shell exits

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

HI Andy,

On 9/15/22 4:23 AM, Ralph Lange via Tech-talk wrote:

On Thu, 15 Sept 2022 at 09:50, Wang, Andrew via Tech-talk <tech-talk at aps.anl.gov> wrote:

I am wondering if it is possible to have a record process only when the exit command is sent to the IOC Shell. 

Have a look at the different options for the PINI field. That's probably as close as you can get without coding.

https://epics.anl.gov/base/R7-0/6-docs/menuPini.html

Unfortunately PINI doesn't have a shutdown choice at all, which comes from the history that embedded IOCs didn't need to handle releasing resources at shut-down, so the IOC shutdown process wasn't very well defined.

I think the only way to do what you're wanting is to have some code register an epicsAtExit() routine as late as possible, either from an st.cmd command after iocInit or from initHookAfterIocRunning, and for its routine to trigger record processing. I would suggest having it call postEvent(eventNameToHandle("exit")) (after including dbScan.h to declare those routines) which would trigger all records that have SCAN="Event" and EVNT="exit".

HTH,

- Andrew

-- 
Complexity comes for free, Simplicity you have to work for.