Re: Starting an app from the ioc st.cmd

["Kasemir, Kay via Tech-talk" <tech-talk@aps.anl.gov>]

At least with epics 7 there’s a “system.dbd” in base that you can include in your app’s dbd.

“softIoc” and “softIocPVA” do include it.

It contains “registrar(iocshSystemCommand)”, so same difference in the end.

 

From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Mark Rivers via Tech-talk <tech-talk@aps.anl.gov>
Date: Wednesday, September 20, 2023 at 3:13 PM
To: Siddons, Peter <siddons@bnl.gov>, tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: [EXTERNAL] RE: Starting an app from the ioc st.cmd

Hi Pete,

 

I believe the “system” command is still available, but for security reasons it is disabled by default. This document:

https://epics.anl.gov/base/R3-16/2-docs/AppDevGuide.pdf

says on page 261:

 

Send command_string to the system command interpreter for execution. This command is present only if some application database definition file contains registrar(iocshSystemCommand) and if the system provides a suitable command interpreter (vxWorks does not).

 

Mark

 

 

From: Tech-talk <tech-talk-bounces@aps.anl.gov> On Behalf Of Siddons, David via Tech-talk
Sent: Wednesday, September 20, 2023 2:05 PM
To: tech-talk@aps.anl.gov
Subject: Starting an app from the ioc st.cmd

 

How can I make the IOC boot script also start an external program? THere used to be an iocsh command "system", but it doesn't seem to exist anymore. ALternativerly, how can I export the PV header info ($(P), $(R) ) so an external program can read  them?

I have a few systems running the same IOC with different PV headers, and I want to allow the external code to pick up the current device's headers so I don't have to manually change them.

Probably a dumb question, but I can't see how to do it 🙂

Pete.