Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Mon, 18 Dec 2000 15:36:32 -0700

> 
> Steven Hartman wrote:
> > 
> > On Fri, 15 Dec 2000, Marty Kraimer wrote:
> > > Release 3.13.4 is now available.
> > 
> > I have experienced a problem with ca clients (including medm, probe, etc.)
> > compiled under 3.13.4 in connecting to PVs on 3.11 IOCs. The same clients
> > compiled using 3.13.3 work normally in connecting to these same PVs. For
> > example, using caExample (on a Solaris 7 host to get a PV residing on a
> > 3.11 ioc) . . .
> 
> I dont think that anyone doing development still has access to any 3.11 systems.
> Thus it is not too surprising that your problem is occuring. Since none of the
> developer's have a 3.11 system available this may not be easy to fix.
> 

Fortunately, there were very few changes between EPICS R3.13.3 and EPICS 
R3.13.4.

I suspect that if you remove the if statement labeled "before" below 
on line 1048 in the R3.13.4 epics/base/ca/service.c ()
and replace it with the code labeled "after" below 
that you will find that R3.13.4 will connect properly with R3.11.

before:
>     if ( piiu->state != iiu_connected ) {
> 		UNLOCK;
> 		return;
>     }

after:
    if ( CA_V42( CA_PROTOCOL_VERSION, piiu->minor_version_number ) ) {
        if ( piiu->state != iiu_connected ) {
	        UNLOCK;
	        return;
        }
    }

Sorry about the inconvenience. As Marty undedicated it is very difficult to
test against very old releases.

I have tested this change with R3.13 servers. Please let me know if this change
works with R3.11 systems and I will commit it on the R3.13 patch branch. 

I would also like to hear from any other sites that are still using an EPICS 
release prior to R3.12.

Jeff

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System