Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 03 Apr 2006 13:56:51 -0500

Rod Nussbaumer wrote:

I am trying to set up a Linux host running a soft IOC, where there is a
coordinated system of start-stop-restart commands available for
maanaging the IOC as a system service. I would like to be able to issue
a signal to the IOC to shut it down in a way that is at least as
graceful as typing 'exit' at the IOC shell. Which, if any, signal does
this? Is there any reason a new IOC could not be immediately started?
The EPICS database may change between runs. In fact, this is the main
reason for performing the restart.

There is no signal (as in "kill -HUP" type of signal) to restart an IOC.
You can create a subroutine record that calls exit() though and then
use caput to do this (the softIoc binary that gets built by base
includes such an exit subroutine already). Alternatively you could wrap
your IOC binary with a script to do the restart, and just kill the ioc
process directly. We do something like this here at APS to ensure that
soft IOCs automatically restart themselves in the event of a crash,
although we do have a restart limit counter to ensure they don't loop
forever.
- Andrew
--
There is no S in exprexxo.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System