On Sat, 30 Mar 2024 22:44:30 GMT "esst...@juno.com" <esst...@juno.com> wrote:

:>I am looking at Sub System Interface Function Codes 04, 08, 10. and 50.
:
:>I Understand there's a protocol for providing response codes using SSOBRETN 
and Register 15 -
:.
:>What if upon entry to an SSI Function Routine Register 1 and Register 0 are 
corrupted or the respective eyecatcher's 
:>in the SSOB and/or SSCVT are not what is expected ? 
:>I don't think abending is acceptable as I suspect that would stop the scan of 
the SSCVT chain ? Correct ? 
:
:>So what is the recommended action when Register 1 or Register 0 have been 
corrupted upon entry   
:> to a SSI Function Routine ? 

Assuming this is a true routine hung of the SSVT and not hooking SSI, to get
to the subsystem requires that the SSIB points to your subsystem and the SSOB
is a function you requested.  I wouldn't even bother checking as it would
require serious failures in MVS to get there. If hooking SSI, I would just
pass it on.

I remember code I saw that checked for MVS, and if not issued a WTO (SVC 35),
which quite probably would cause other trouble to an OS that might not
properly understand the SVC.

--
Binyamin Dissen <bdis...@dissensoftware.com>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel

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