Re: how to issue a shell command from EPICS record ?

[Christian Pauly <pauly@physik.uni-wuppertal.de>]

Dear all
thanks for all the nice suggestions how to solve my shell command problem.
Of all presented solutions i like the "subroutine record" or the 
"StreamDevice" solution most.
In both cases i have to implement a new iocsh function in C to do the 
system() call, as shown in the example from Emmanuel.
My iocsh does not support the system command (solution from Dirk), 
always says "command not found" if i try to type it in directly in the 
iocsh. I found something that i have to add 
"registrar(iocshSystemCommand)" to my database definition file (.dbd) to 
get the system command in iocsh, but somehow that does not work.
However, if i understand correctly: If i add a new command to the iocsh 
which then calls the C-function system(), then i anyway dont depend on 
the system command in iocsh right ?
My problem now:
There was a nice example code posted by Emanuel, but i am quite a newby 
to EPICS and somehow dont figure out where to put this.
My starting point is the example ioc application from the "EPICS 
Application Developers Guide" generated with the makeBaseApp.pl script.
I can start the ioc (st.cmd), and can access the PVs using caget.

Where do i have to put the C-code with the definition of the new iocsh 
command now ?
Do i have to change Makefiles somewhere to compile it ?
And how do i define the corresponding "subroutine record" in my database 
.db file ?
Could you provide a bit more (basic) information ?
I am using EPICS R3.14.12.3


Thanks a lot,
Christian

--
Dr. Christian Pauly
Bergische Universität Wuppertal
Fachbereich C - Physik
Gaußstraße 20, D-42119 Wuppertal
Tel: +49 (0)202 439-2632,
Fax: +49 (0)202 439-2662