Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
PDSBK
Control Block Contents
PDSBK DSECT
Cross Reference (Contains links to field and bit definitions)
PDSBK Prolog
NAME : HCPPDSBK DESCRIPTION: Partitioned Data Set Block DSECT : PDSBK FUNCTION : The PDSBK describes the contents of CMS partitioned data set headers. LOCATED BY : It is record number 1 of the CMS file CREATED BY : None DELETED BY : None RELOCATION CONSIDERATIONS : None NOTES : This description of the PDS directory description record was extracted from the CMS file PDSSECT MACRO. The CMS definitions are shown here, too. It makes for cluttered listing, but it helps to see the CMS original definitions.
PDSBK Control Block Content
PDSBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure PDSBK Partitioned Data Set Block LIBPDS format 0000 0 Character 6 PDSNID LIBPDS (new format) id 11.1 .111 PDSNFNEW C'P' PDSNFNEW Check PDSNID+3, old vs new. 0006 6 Bitstring 1 PDSNFLG1 Flag1. .1.1 1.11 PDSNTEMPF C'$' PDSNTEMPF Dir is in $PDSTEMP file. 0007 7 Bitstring 1 PDSNFLG2 Flag2. 0008 8 Signed 4 PDSNDRSZ Directory size in bytes 000C 12 Signed 4 PDSNDST Directory starts at this record number 0010 16 Signed 4 PDSNNTSZ Each directory entry is this number of bytes long 00000014 PDSNSZ *-PDSBK Size for LIBPDS format Old DMSLIB format 0000 0 Character 6 PDSOID DMSLIB (old format) id 0006 6 Signed 2 PDSODST Directory starts at this record number 0008 8 Signed 1 * 0009 9 Signed 1 * 000A 10 Signed 2 PDSODRSZ Directory size in bytes 000C 12 Signed 2 * 000E 14 Signed 1 * 000F 15 Signed 1 * 0010 16 Signed 4 PDSODRLN Each entry size in bytes 00000014 PDSOSZ *-PDSBK Size for CMSLIB format Old MACLIB format 0000 0 Character 6 PDSMID MACLIB (old format) id 0006 6 Signed 2 PDSMDST Directory starts at this record number 0008 8 Signed 2 PDSMDRSZ Directory size in bytes 000A 10 Signed 2 DIRNAME (3) MACLIB IDENTIFIER 0010 16 Signed 2 DIRPTR ITEM PTR TO START OF DIRECTORY 0012 18 Bitstring 1 TEMPBYTE IF $ , THEN PDS IS IN $PDSTEMP FILE 0013 19 Bitstring 1 NEWBLKS NO. NEW BLKS ADDED TO PDS BY STOW 0014 20 Signed 2 CORESIZE SIZE OF DICTIONARY IN BYTES 0016 22 Signed 2 PDSBLKSI BLOCKSIZE OF DICTIONARY 0018 24 Bitstring 1 CHNGBYTE INDICATES UPDATES TO DICTIONARY 0019 25 Bitstring 1 * NOT USED - 0000001A PDSMSZ *-PDSBK Size for MACLIB format End of PDS formats 00000004 PDSBKSZ (*-PDSBK+7)/8 Max size of PDSBK (d-words)
PDSBK Storage Layout
*** PDSBK - Partitioned Data Set Block * * +-------------------------------------------------------+ * 0 |///////////////////////////////////////////////////////| * =///////////////////////////////////////////////////////= * |/////////////+-----------------------------------------+ * |/////////////| * +-------------+ * *** PDSBK - Partitioned Data Set Block *** Overlay for PDSBK in PDSBK * * +-----------------------------------------+------+------+ * 0 | PDSNID |:NFLG1|:NFLG2| * +---------------------------+-------------+------+------+ * 8 | PDSNDRSZ | PDSNDST | * +---------------------------+---------------------------+ * 10 | PDSNNTSZ | 14 * +---------------------------+ * *** Overlay for PDSBK in PDSBK *** Overlay for PDSBK in PDSBK * * +-----------------------------------------+-------------+ * 0 | PDSOID | PDSODST | * +------+------+-------------+-------------+------+------+ * 8 |//////|//////| PDSODRSZ |/////////////|//////|//////| * +------+------+-------------+-------------+------+------+ * 10 | PDSODRLN | 14 * +---------------------------+ * *** Overlay for PDSBK in PDSBK *** Overlay for PDSBK in PDSBK * * +-----------------------------------------+-------------+ * 0 | PDSMID | PDSMDST | * +-------------+---------------------------+-------------+ * 8 | PDSMDRSZ | DIRNAME | * +-------------+------+------+-------------+-------------+ * 10 | DIRPTR |:PBYTE|:BLKS | CORESIZE | PDSBLKSI | * +------+------+------+------+-------------+-------------+ * 18 |:GBYTE|//////| 1A * +------+------+ * *** Overlay for PDSBK in PDSBK
PDSBK Cross Reference
Symbol Dspl Value -------------- ---- ----- CHNGBYTE 0018 CORESIZE 0014 DIRNAME 000A DIRPTR 0010 NEWBLKS 0013 PDSBKSZ 0019 00000004 PDSBLKSI 0016 PDSMDRSZ 0008 PDSMDST 0006 PDSMID 0000 PDSMSZ 0019 0000001A PDSNDRSZ 0008 PDSNDST 000C PDSNFLG1 0006 PDSNFLG2 0007 PDSNFNEW 0000 D7 PDSNID 0000 PDSNNTSZ 0010 PDSNSZ 0010 00000014 PDSNTEMPF 0006 5B PDSODRLN 0010 PDSODRSZ 000A PDSODST 0006 PDSOID 0000 PDSOSZ 0010 00000014 TEMPBYTE 0012
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