The IPA contains the specification. No documentation is, or likely ever
will be, provided about the values you might find there. The field is an
interface for extracting data (if any) that was specified during IPL.
That's not to say that you're likely to get it wrong, or that things are
likely to change in that area, but it's not impossible (there are no plans
to change). If you want a programming interface for determining the state
of the option, then you really ought to ask for one.
Mark's code is not correct, by the way, in identifying the LNKAUTH option
(APFTAB or LNKLST).
You can look in the source of CSVDLCB in SYS1.MACLIB and see that the PL/X
for the bit that his code is checking has the following:
5 DlcbAPF BIT(1), /* Only valid when "Active",
indicates that the entire
LNKLST concatenation is authorized. Can
use to set DEBAPFIN @L1A*/
This applies only to the LNKLST for this address space (so could be
different for another address space's LNKLST) and does mean what the
commentary says. The wording is not necessarily the same as meaning that
LNKAUTH=LNKLST is in effect. And it still remains a fact that it is not a
programming interface.
Peter Relson
z/OS Core Technology Design
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