Four installation exit routines are provided for abnormal end with
ISO/ANSI Version 3 or Version 4 tapes.
- The label validation exit is entered during OPEN/EOV if a nonvalid
label condition is detected and label validation has not been suppressed.
Nonvalid conditions include incorrect alphanumeric fields, nonstandard
values (for example, RECFM=U, block size greater than 2048, or a zero
generation number), nonvalid label sequence, nonsymmetrical labels,
nonvalid expiration date sequence, and duplicate data set names. However,
Version 4 tapes allow block size greater than 2048, nonvalid expiration
date sequence, and duplicate data set names.
- The validation suppression exit is entered during OPEN/EOV if
volume security checking has been suppressed, if the volume label
accessibility field contains an ASCII space character, or if RACF
accepts a volume and the accessibility field does not contain an uppercase
A through Z .
- The volume access exit is entered during OPEN/EOV if a volume
is not RACF protected and the accessibility field in the volume label
contains an ASCII uppercase A through Z .
- The file access exit is entered after locating a requested data
set if the accessibility field in the HDR1 label contains an ASCII
uppercase A through Z.
ISO/ANSI Version 4 tapes also permits special characters !*"%&'()+,-./:;<=>?_
and numeric 0-9.
Related reading: For additional information
about ISO/ANSI Version 3 or Version 4 installation exits see z/OS DFSMS Installation Exits.
z/OS DFSMS Using Data Sets
Copyright IBM Corporation 1990, 2014