Shmuel Metz wrote
"If you OPEN a DCB with a ddname allocated to a subsystem data set then OPEN
loads a compatibility interface and opens an ACB under the covers. The
subsystem sees only the ACB/RPL interface, not the DCB."
.
.
Where in z/OS publications is this documented ?
---------- Original Message ----------
From: "Shmuel Metz (Seymour J.)" <shmuel+ibm-m...@patriot.net>
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: SUBSYS DD REVISITED
Date: Sat, 14 Nov 2015 18:57:46 -0500
In <20151114.112844.57...@webmail03.dca.untd.com>, on 11/14/2015
at 04:28 PM, "esst...@juno.com" <esst...@juno.com> said:
>Recently a question was posted regarding SubSystem Datasets, more
>appropriatly the use of a SUBSYS= parameter on a DD statement.
>//DD1 DD SUBSYS=(ssn,'parms').
There's a sample subsystem on the CBT tape.
>However neither technology provides a PUT/WRITE function/exit.
If you OPEN a DCB with a ddname allocated to a subsystem data set then
OPEN loads a compatibility interface and opens an ACB under the
covers. The subsystem sees only the ACB/RPL interface, not the DCB.
>Each I/O from an application with the appropriate SUBSYS statement
>should be directed to my SubSystem Address Space.
A subsystem does not require a separate address space.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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