On Tue, 25 Sep 2018 09:40:16 -0700, Charles Mills wrote:

>The APARs are pretty specific about "IDCAMS." 
> 
Yes, but the OP mentions FTP, not IDCAMS.  But how broad is the reach of IDCAMS?
Possible anything that employs Catalog Services?

>There is a little bit more of a *hint* on the "why" in APAR OA43330.
> 
"[L]ittle" seems to be the operant word.

>"My" product uses fopen() extensively for "legacy" datasets in a variety of 
>customer environments and we have gotten no reports of issues.
> 
I know an OMVS segment is needed for FTP nowadays.  Is a TSO segment or UADS
entry likewise needed, perhaps by the user ID/password dialogue?

How does fopen() by a user having neither UADS nor RACF/TSO treat an 
incompletely
qualified DSN (e.g. "//SYS1.SAMPLIB" as opposed to "//'SYS1.SAMPLIB'")?  Does 
POSIX
make a difference?

-- gil

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