Thomas David Rivers wrote:
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'.
Binyamin Dissen asked:
What is the second parameter of the read?
--
Binyamin Dissen <[email protected]>
http://www.dissensoftware.com
The parms passed to the READ SVC (addressed by R1) are
0 X'00000000'
4 X'0048'
6 X'0000' (zero length, use the blksize from the DCB?)
8 X'0000BFF8' (address of the DCB)
12 X'00016000' (AREA ADDRESS)
16 X'00000000' (IOB ADDRESS)
20 X'00000000' (KEY ADDRESS)
24 X'0000c40c' (BLKREF ADDRESS)
It seems I had mis-counted, and its the KEY ADDRESS that
is X'0' - not the BLKREF ADDRESS (which is actually not X'0')
(I'm laying out my error for the proper group humiliation :-) :-) :-) )
But, since I don't seem to be able to count... is that
the proper layout of the parms to the READ SVC?
And - back to the original question, is there _ever_ a situation
in a BDAM READ where the BLKREF address _could_ be X'0'?
(Today, I'm guessing not...)
- Thanks! -
- Dave Rivers -
--
[email protected] Work: (919) 676-0847
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