I open a QSAM input DCB with zero RECFM, LRECL, and BLKSIZE whose DD is a JCL-allocated dataset. The dataset is a PDS which exists, but the member specified in the JCL does not exist. I get an S013-18 on the OPEN as I would expect. I recover from the S013-18 with a DCB abend exit. I subsequently close the DCB. The evidence I am seeing indicates that the DCB is not restored by CLOSE to its pre-OPEN state; that is, the PDS's RECFM, LRECL, and BLKSIZE are those of the PDS, and no longer zero. This behavior contradicts my expectations and my impression of normal QSAM behavior, that CLOSE returns a DCB to its pre-OPEN state. FWIW, I get exactly the same behavior if I do not close the DCB. Is this a known behavior of QSAM? Is there a way to avoid it, other than the brute-force method of re-initializing the DCB in my own code? Charles Mills
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