I'm debugging a program (no source), and trying to
figure out what BDAM does when the READ macro
is invoked without a BLKREF relative-block-address
specified.
This is an RBA-type BDAM, and I'm seeing a READ
where the BLKREF in the DECB is simply X'0'.
I thought the BLKREF field would point to a location
that contained the relative-block-address value.
So - what does BDAM do with such a thing - does it
read the "next" block (where next would be the one
after the current one.) Or???
It doesn't seem to fail/ABEND in anyway... seems to
merrily read _something_ - just not sure what.
I've looked thru various IBM books, but can't seem to
find a definition of what happens when the READ
doesn't specify a BLKREF parm. The BDAM READ
documentation doesn't seem to say its optional,
but I can slap together an example and leave it off...
I suppose my question boils down to:
What does BDAM READ do if the BLKREF macro
parameter is omitted?
- Thanks -
- Dave Rivers -
--
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