z/OS DFSMStvs Administration Guide
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VSAM OPEN/CLOSE/End-of-Volume return and reason codes

z/OS DFSMStvs Administration Guide
GC52-1388-00

VSAM O/C/E macros return to their caller return codes set in register 15 and reason codes set in the access method control block (ACB) ACBERFLG field (1 byte at ACB + X'31').

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