Call Bob Shimizu at 1-800-932-5150.  He can be most helpful.

Chris Blaicher
Principal Software Engineer, Software Development
Syncsort Incorporated
50 Tice Boulevard, Woodcliff Lake, NJ 07677
P: 201-930-8260  |  M: 512-627-3803
E: cblaic...@syncsort.com

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Robin Atwood
Sent: Monday, June 09, 2014 9:39 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Problems with XDC hooks

I have inherited  a newly acquired mainframe server which I am trying to 
instrument with XDC. It has a number of worker ASIDs which are RENT, reside in 
an APF library but run in problem state with all authorised stuff is done by a 
user SVC. This is because each ASID is a TSO batch job which starts up ISPF, 
which in turn promptly selects a PL/1 program to make sure everything is LE 
enabled. (I know, it was something I did in a previous life.)

An XDC hook seemed the obvious way to go because the first thing it does is 
cancel a lot of the LE SPIE traps. I have tried this two ways, dynamically and 
assembling in the #XDCHOOK macro, but the result is the same. The hook is 
executed and the WTOR is displayed and I can connect to the ASID via XDCCDF. 
But when I try to set a break-point or step through the code I get:

DBC045E STORAGE ACCESS VIOLATION - ABEND 0C4-04 OCCURRED DURING ZAP ATTEMPT
- PROTECTED AGAINST
DBC045E ACCESS - TARGET IS IN KEY-0 STORAGE.

DBC045E ZAP METHOD ATTEMPTED: NORMAL ADDRESSING

DBC045E FOR POSSIBLE RESOLUTIONS TO THIS PROBLEM, TYPE AN H AT THE LEFT AND
PRESS ENTER

The advice is to issue a 'SET ZAP SPROT' command but that makes no difference. 
I noticed the "//xxxRENT8 DD DUMMY " trick but that has no effect on an STC. 
The curious thing is we have another server which is linked RENT and loads XDC 
as its ESTAE; stepping through that is no problem.
What have I missed here?

TIA
Robin

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