My understanding is if the target address space is non-swappable then
you can safely use non-srb code to obtain access to the other address
space's private area. I believe the unpredictability comes when the
target address spaces are swappable. Depending upon your application
requirements non-srb code may in fact work. For example, address spaces
with a system LX that support space switch pc routines will always be
non-swappable. If your application required data from these address
spaces you should be ok. There are other address spaces that normally
run non-swappable. However, you could not access all address spaces with
this technique. For swappable address spaces you should use SRB code. As
usual, it depends upon your application.........
Chris Craddock wrote:
On Mon, May 10, 2010 at 4:37 PM, Rick Fochtman <rfocht...@ync.net> wrote:
-----------------------------<snip>------------------------------------
Highly unlikely unless I'm missing something obvious. The only LEGAL way to
access memory in some other address space is via an SRB. You need to be in
sup state and key zero to schedule an SRB and REXX runs key 8 and problem
state. But if we're allowed to cheat then I'll play :-)
PS> I didn't know there were any mainframe people at Queens...
-------------------------------<unsnip>-------------------------------
Not strictly true, but the mechanisms are NOT for the meek! I've found
other ways but in the interests of safety, I'll not share them.
Notice that I said "Legal". Nothing else is supported by the z/OS software
architecture - regardless of whether something else is possible under the
hardware architecture. Any grinning idiot with an APF library can study PoPs
and contrive ways of gaining addressability to some other address space, but
since z/OS doesn't know (or allow!) what you would be doing, the results are
most kindly described as "unpredictable".
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