Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Mon, 5 Nov 2007 11:14:50 -0600

Ahh....*now* I understand.

I didn't realize that you want this to work completely separated from
EPICS. I think that envPaths should work with cexp -- the default
implementation of epicsEnvSet doesn't seem to call on anything
outside of libCom. You'd then make calls to chdir(getenv(xxxx))
where xxxx had been previously set by a call to epicsEnvSet().
On Nov 5, 2007, at 10:46 AM, Ernest L. Williams Jr. wrote:
Hi Eric,

Okay, so this means that iocsh has no dependencies on EPICS?
We could use iocsh as just a basic SHELL with the RTEMS OS?
I guess we will still need to do some kind of cdCommands to support
the

cexp SHELL that we use here.

Thanks,
Ernest

On Mon, 2007-11-05 at 10:38 -0600, Eric Norum wrote:

On Nov 5, 2007, at 10:18 AM, Ernest L. Williams Jr. wrote:
On Mon, 2007-11-05 at 10:10 -0600, Eric Norum wrote:

We use envPaths here, since we use iocsh rather than cexp to start
our RTEMS IOCs.
Or am I misunderstanding what you want?

There are certain operating system specific commands one might
perform

before EPICS is loaded up. For example, we may want to cd around
the

file system in an easy way before EPICS loads up.

And envPaths/iocsh allow this.
Here are the first few lines from one of our RTEMS IOC startup
scripts.  The values of TOP, ASDSTD, and ARCH are all set by the
envPaths file.
#####################################################################
###

#####

# Set up environment variables

# EDM wants to transfer waveform values as 4-byte values which means

that

# EPICS_CA_MAX_ARRAY_BYTES must be greater than 2^18*4.

< envPaths

epicsEnvSet EPICS_CA_MAX_ARRAY_BYTES 1050000

epicsEnvSet TZ "CST6CDT,M 3.2.0,M 11.1.0"

epicsEnvSet MAX1619_ADDR 24

< ../nfsCommands

epicsEnvSet IOC_INFO /iocinfo

epicsEnvSet P B:tune:

cd "${TOP}"

.....

then later on in the script there's a more complex cd:

cd "${ASDSTD}/bin/${ARCH}"

--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System