Return Codes from CVAFDIR

On return from CVAF, register 1 contains the address of the CVPL (CVAF parameter list), and register 15 contains one of the following return codes:

Return Code	Meaning
0 (X'00')	The request was successful. However, if the CVAFDIR request is to read or write a DSCB and a VTOC index structure error is encountered, the CVSTAT field indicates the structure error that was encountered. (CVSTAT code descriptions are in z/OS DFSMSdfp Diagnosis.)
4 (X'04')	An error occurred. The CVSTAT field in the CVPL contains an indication of the cause of the error. (CVSTAT code descriptions are in z/OS DFSMSdfp Diagnosis.)
8 (X'08')	Invalid VTOC index structure while processing a request to read or write a VTOC index record. The CVSTAT field in the CVPL contains an indication of the cause of the error. (CVSTAT code descriptions are in z/OS DFSMSdfp Diagnosis.)
12 (X'0C')	The CVAF parameter list is not in your protect key or is not valid (the ID is not valid, or the length field is incorrect, or the CVFCTN (function code) field is not valid or is not supported in this release). The CVPL has not been modified.
16 (X'10')	An I/O error was encountered.