At 17:09 -0400 on 06/08/2011, Tony Harminc wrote about Re: DCBs and
DCBEs - Could IBM have done it any worse?:
So OPEN not only zeroed out the DCBE pointer, but it also turned off
the flags that show that such a pointer exists? I suppose that's
considerate...
Considerate Nothing - Since it destroyed the DCBE Pointer (by setting
it to Zero) it HAD to reset the flags or the first time something
tried to access the DCBE Pointer (since the flags were still set) it
would ABEND/0cx. The only way to avoid this is to unset the flags
that would cause the pointer to be referenced.
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