I have the same understanding. I've sometimes wondered why there was
never an explicit non-modifiable attribute. Especially since the system
tries in more than one way to take RENT or REFR to mean that.
RENT, REFR, and self-modification are completely independent attributes
(although some permutations are somewhat degenerate).
sas
On 2/19/2016 12:30, Gary Weinhold wrote:
I have always understood that refreshable always meant that the
executable could be replaced by the copy from a load library at
anytime, which probably could be interpreted as between the execution
of any two instructions. I thought of reentrant as a considerably
looser definition, and presumably allowed self-modifying programs as
long as concurrent usage of the executable in memory was not adversely
affected. Implementing CICS's SIT option RENTPGM=PROTECT seemed to
require reentrant load modules to actually be refreshable.
Gary Weinhold Senior Application Architect
DATAKINETICS | Data Performance & Optimization
Phone +1.613.523.5500 x216
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On 2016-02-17 16:51, Paul Gilmartin wrote:
On 2016-02-17 10:38, Jim Mulder wrote:
The administrator should be specifying REFRPROT in PROGxx.
The only reason we made it an option was concern that an installation
might have self-modifying programs which were incorrectly had the
REFR attribute, and we didn't want that to be a migration issue for
z/OS 1.9, where REFRPROT was introduced.
Your use of "should" suggests that you believe REFRPROT should be the
default? Is it? Such things can be phased in as I believe was done
or is in progress for protection against user key CSA.
-- gil
