ISFCALLS is an external REXX function - all that is required is that the load
module (it is an alias to ISFYHOST in SISFLOAD) is available via the normal
search sequence.
ISFCALLS returns rc=0 by design when the host environment already exists.
There are no integrity issues introduced by omitting the ISFCALLS('OFF').
Rob Scott
Rocket Software
-----Original Message-----
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Paul Gilmartin
Sent: Thursday, August 27, 2020 5:35 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: SDSF RCF (was: MVS modify command capture)
EXTERNAL EMAIL
On Thu, 27 Aug 2020 16:10:01 +0000, Rob Scott wrote:
>From what I can see, the original script was a REXX exec and from Chapter 5 in
>the SDSF User Guide :
>
>"Adding the SDSF host command environment with ISFCALLS
>
>Using SDSF with REXX requires that you add a host command environment prior to
>any other SDSF host environment commands.
>
But that in turn depends on ISFCALLS's availability in the function package
with which Rexx is started. That's true for TMP, UNIX, and IRXJCL. It may be
untrue for minor products, perhaps from ISVs.
What is the adverse consequence of omitting ISFCALLS( 'OFF' )? Integrity?
I'm inclined to omit it, especially near the end of an EXEC. I suspect the case
worst for performance is multiple ISFCALLS ON ... OFF pairs bracketing short
sections of code.
ISFCALLS appears not to have a Result code defined for "ISFCALLS already
active" to enable the coder of a Rexx subroutine to restore the status on entry.
-- gil
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