On Tue, Feb 19, 2019 at 10:21 AM Charles Mills <charl...@mcn.org> wrote:
> It does not matter to my original problem but do you get NULLFILE for a
> UNIX file? I seemed to recall something like '..HFS..' or something like
> that. Can't find any documentation.
>
Oh, I think you're right. From the IEFJFCBN macro in SYS1.MACLIB:
* DCL JFCBPCON CHAR(21) CONSTANT('...PATH=.SPECIFIED...');
>
> Grrr. "The RDJFCB parameter list, the DCB, and the JFCB area specified in
> the exit list as well as the exit list itself must reside below 16 MB."
> I've got the DCB there of course but no spare room without shuffling other
> things. Solvable, but one more annoying complexity. I guess that's why we
> get the big bucks.
>
> Charles
>
>
> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of John McKown
> Sent: Tuesday, February 19, 2019 7:39 AM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: Any easier way to determine if DD is dummy than GETDSAB?
>
> On Tue, Feb 19, 2019 at 9:20 AM Charles Mills <charl...@mcn.org> wrote:
>
> > I've got a requirement to determine whether a DD is allocated DUMMY. I
> know
> > how to find the TIOT, get the JFCB with SWAREQ, check for 'NULLFILE' and
> > loop through all of the JFCB chain. Is there any easier way? That's a lot
> > of
> > complexity for a simple question!
> >
> > Why? I'm trying to avoid an S013-64 on a BPAM file if the user does not
> > supply a DSN to a PROC. I'm defaulting the DSN to NULLFILE. I'd like to
> be
> > able to determine that from my program.
> >
> > The program is in IBM C but I can readily call out to assembler. The OPEN
> > for the BPAM DCB is in assembler, not using the C library.
> >
>
> RDJFCB will also return NULLFILE for a DD DUMMY. Unfortunately, it also
> returns that for a UNIX PATH= file.
>
>
> https://www.ibm.com/support/knowledgecenter/en/SSLTBW_2.2.0/com.ibm.zos.v2r2.idas300/rdjfcb.htm
>
>
>
> >
> > Thanks!
> >
> > Charles
> >
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> >
>
>
> --
> I just burned 2000 calories!
> That's the last time I'll nap with brownies in the oven.
>
> Maranatha! <><
> John McKown
>
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--
I just burned 2000 calories!
That's the last time I'll nap with brownies in the oven.
Maranatha! <><
John McKown
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