I'm not saying that I agree that GETMAIN should initialize the storage. I am just saying that the way storage is handled has changed in z/OS 1.10 and it bit us in vendor code. As I said earlier, programming 101 says that you should initialize any area you plan on using so, if the program was coded correctly, changes in GETMAIN wouldn't have caused this problem. That being said, can you guarantee that all of your old assembler programs initialize their working storage?
Jon L. Veilleux [EMAIL PROTECTED] (860) 636-2683 -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Walt Farrell Sent: Friday, November 21, 2008 1:28 PM To: [email protected] Subject: Re: z/OS upgrade On Fri, 21 Nov 2008 12:46:14 -0500, Veilleux, Jon L <[EMAIL PROTECTED]> wrote: >Wayne, I ran a test on both z/OS 1.9 and z/OS 1.10 using the following >code and on 1.9 the area was initialized to zeroes and on 1.10 it wasn't: > > L R6,=F'1000' > GETMAIN R,LV=(6) > LTR R15,R15 > BNZ GETERR > LR R4,R1 * PUT IN WORKREG > LA R5,100(R4) >********************* BEGIN SNAP ROUTINE > OPEN (SNAP,OUTPUT) > SNAP DCB=SNAP,PDATA=REGS,ALL,STORAGE=((R4),(R5)) There is no a guarantee that the storage obtained by that particular GETMAIN will be cleared to zero, Jon, and there has never been one. It is entirely dependent on storage layout and what has run previously in that task. The books document the cases where GETMAIN and STORAGE guarantee the storage is zeroed. In all other cases there is no guarantee, and if the storage in some other case ends up zeroed you're just lucky (or unlucky, depending on your viewpoint). -- Walt ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html This e-mail may contain confidential or privileged information. If you think you have received this e-mail in error, please advise the sender by reply e-mail and then delete this e-mail immediately. Thank you. Aetna ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
