I don't know when it wouldn't. I personally wrote the code to zero out a page on its first reference after GETMAIN back in the '70s. But as has been discussed here, if it is part of a page that is FREEMAINed and then the same address is returned by a subsequent GETMAIN, data may likely be present from its last use. That is unless subsequent versions were modified to clear any newly GETMAINed storage.

Mike Myers
Mentor Services Corporation
Technical Team Lead for VSM and RSM development for the first release of MVS

 On 01/07/2017 04:19 PM, Binyamin Dissen wrote:
On Sat, 7 Jan 2017 16:57:05 +0000 "Blaicher, Christopher Y."
<[email protected]> wrote:

:>Generally speaking, a page sized request will return a zeroed page, but there 
is no guarantee for that unless you specify that on the GETMAIN.

What is the case where it would not return a zeroed page?

--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com

Director, Dissen Software, Bar & Grill - Israel


Should you use the mailblocks package and expect a response from me,
you should preauthorize the dissensoftware.com domain.

I very rarely bother responding to challenge/response systems,
especially those from irresponsible companies.

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