Re: Using DATACLASS
- From: miklos.szigetvari@xxxxxxxxxxxxxxxx (Miklos Szigetvari)
- Date: 7 Sep 2009 09:33:13 -0700
Paul Gilmartin wrote:
On Mon, 7 Sep 2009 09:39:20 -0600, Steve Comstock wrote:Via JCL(DD:ddname) the DCB is taken from DATACLASS
Miklos Szigetvari wrote:At what point in processing does SMS insert the values obtained
It is not so, I get the stupid C/C++ default DCB attributes .I imagine if you don't supply values, the compiler
How is wrong ? me (propably) C/C++ LE (maybe) SMS - allocation ?
inserts its defaults. DATACLAS will only override
non-supplied values, so you get the compiler supplied
values. You need to explicitly code zeros in your
code to override the compiler defaults; then ACS
routines have a chance.
from DATACLASS? If it's prior to entering the DCB OPEN exit,
SMS values should be as good as values coded on the JCL DD
statement. Are those effective? Or does the CRTL do something
really unorthodox such as examining the JFCB to decide whether
to supply its own values?
Is the behavior the same if you allocate the file, either with
JCL DD or with BPXWDYN, and open with the DD:ddname construct?
I know that IBM has modified programs (IEBGENER, Rexx), perhaps by
APAR, to eliminate their thwarting the operation of SDB, which
comes in after the DCB OPEN exit. Perhaps this, also, is APARable.
-- gil
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Miklos Szigetvari
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