In
<caarmm9tc-6hu58sqjerp2ymkfmk644gppaywrvq7r3kht5j...@mail.gmail.com>,
on 09/05/2014
   at 03:18 PM, Tony Harminc <[email protected]> said:

>Under what circumstances can the JS TCB DEB pointer (TCBDEB) be zero?

When there is no open DCB in the task.

>I have at least one open DCB,

In what task?

>Put another way, how can I reliably find an open DCB/ACB for a 
>given DDNAME?

Go through the DEB chain for every task in the J/S.
 
-- 
     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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