Reading a PDSE Directory

You can read a PDSE directory sequentially just by opening the data set (without using positioning macros) and reading it. The PDSE directory cannot be updated. The following rules and guidelines apply to reading a PDSE directory:

The DD statement must identify the DSNAME without a member name.
You can use either BSAM or QSAM with MACRF=R or G.
Specify BLKSIZE=256 and RECFM=F or RECFM=U.
If you also want to read the keys (the name of the last member in that block), use BSAM and specify KEYLEN=8.
After reading the last PDSE directory entry, you read the next directory, or control passes to your EODAD routine. The last directory entry is indicated with a dummy name of eight bytes of X'FF'.
Alias entries with names longer than eight bytes are omitted. To read them, use DESERV.

You can use sequentially read the directories of a concatenation of PDSs and PDSEs. However, you cannot sequentially read a UNIX directory. This is considered to be a like sequential concatenation. To proceed to each successive data set, you can rely on the system's EOV function or you can issue the FEOV macro.