Experimental Physics and
Industrial Control System

Marty Kraimer <[email protected]> · Thu, 22 Feb 1996 12:42:32 -0600

Jeff Hill wrote:
> 
> > Another requirement of the Gemini Project is to be
> > able to dynamically change access to various records and
> > fields. If my understanding is correct, you can do this by
> > calling a special routine from a SUB record which re-initialises
> > access security by re-reading the ACF.
> >
> 
> or just modify a PV that provides input to the access security rules
> 
> Jeff

What Jeff suggests is the best way to satisfy this requirement.
The alternative of rereading the access config file is a rather
drastic measurre. It is really meant for the case in which access
rules are acutally changed without requiring ioc reboots. It
has much more overhead than what Jeff suggests.

As regards to dm (medm). Channel Access supplys a change
of access state callback. CA tools should use this callbacxk.
I know that medm uses it properly, i.e. access icons change
as access priviledge changes. 

Marty Kraimer

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System