Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
DNXBK
Control Block Contents
DNXBK DSECT
Cross Reference (Contains links to field and bit definitions)
DNXBK Prolog
Name : HCPDNXBK Description: Directory index block DSECT : DNXBK Function : The directory index block maps the header and entries for the various directory indices. Located by : DHDRUSER field of HCPDHDR DHDRUID field of HCPDHDR DHDRGID field of HCPDHDR DNXHDAD field of HCPDHDR Created by : HCPDIR HCPUDTBI Deleted by : HCPUDSAT HCPUDSDS HCPUDSIN Comments : This DSECT references fields in HCPDUNDX, so any module using this DSECT must also COPY HCPDUNDX. This DSECT is used to map the various directory indices. Each mapping consists of a header portion and a variable number of index entries. A given DNXBK will only contain a single type of entry; that is, entry types are never mixed in a single DNXBK. This DSECT is used to map both levels of the 2-level indices.
DNXBK Control Block Content
DNXBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DNXBK Directory index block 0000 0 Bitstring 24 DNXHDR (0) Header portion of index block 0000 0 Signed 4 DNXHDAD DASD address of the next DNXBK for this index 0004 4 Signed 2 DNXHCNT Count of entries in this block 0006 6 Signed 2 * Reserved 0008 8 Character 16 DNXHLABL Label for this index 00000018 DNXHDRSZ *-DNXHDR Length of header portion in bytes 0018 24 Bitstring 1 DNXENTRY (0) First entry starts here ORG DNXENTRY Map an entry 0018 24 Bitstring 1 DNXGIDNT (0) GID index entry 0018 24 Bitstring 12 DNXGIPT1 (0) Part 1 of GID index entry 0018 24 Signed 4 DNXGID POSIX group ID (GID) 001C 28 Character 8 DNXGINAM POSIX group name 0024 36 Bitstring 10 DNXGIPT2 (0) Part 2 of GID index entry 0024 36 Signed 4 DNXGICNT Count of members in this group 0028 40 Signed 4 DNXGIDAD DASD address of first DGRPM block 002C 44 Signed 2 DNXGIDSP Displacement to first DGRPM block 00000016 DNXGINSZ *-DNXGIDNT GID entry size in bytes 0018 24 Bitstring 1 DNXUSRNT (0) Userid index entry 0018 24 Character 8 DNXUSBIG Largest userid in the page pointed to by DNXUSDAD 0020 32 Signed 4 DNXUSDAD DASD address of index page 0000000C DNXUSNSZ *-DNXUSRNT Userid entry size in bytes 0018 24 Bitstring 1 DNXUIDNT (0) UID index entry 0018 24 Signed 4 DNXUIBIG Largest UID in the page pointed to by DNXUIDAD 001C 28 Signed 4 DNXUIDAD DASD address of index page 00000008 DNXUINSZ *-DNXUIDNT UID entry size in bytes 0018 24 Character 8 * This field makes up the difference between the normal header above and the DUNDX page header (which is the same size as a DUNDX). 0020 32 Bitstring 1 DNXDUNDX (0) DUNDX page entry (see HCPDUNDX COPY for mapping).
DNXBK Storage Layout
*** DNXBK - Directory index block * * +---------------------------+-------------+-------------+ * 0 | DNXHDAD | DNXHCNT |/////////////| * +---------------------------+-------------+-------------+ * 8 | DNXHLABL | * | | * +---------------------------+---------------------------+ * 18 | DNXGID | DNXGINAM- | * +---------------------------+---------------------------+ * 20 | -(01C) | DNXGICNT | * +---------------------------+-------------+-------------+ * 28 | DNXGIDAD | DNXGIDSP | 2E * +---------------------------+-------------+ * *** DNXBK - Directory index block *** Overlay for DNXENTRY in DNXBK * * +-------------------------------------------------------+ * 18 | DNXUSBIG | * +---------------------------+---------------------------+ * 20 | DNXUSDAD | 24 * +---------------------------+ * *** Overlay for DNXENTRY in DNXBK *** Overlay for DNXENTRY in DNXBK * * +---------------------------+---------------------------+ * 18 | DNXUIBIG | DNXUIDAD | * +---------------------------+---------------------------+ * 20 * *** Overlay for DNXENTRY in DNXBK *** Overlay for DNXENTRY in DNXBK * * +-------------------------------------------------------+ * 18 |///////////////////////////////////////////////////////| * +-------------------------------------------------------+ * *** Overlay for DNXENTRY in DNXBK
DNXBK Cross Reference
Symbol Dspl Value -------------- ---- ----- DNXDUNDX 0020 DNXENTRY 0018 DNXGICNT 0024 DNXGID 0018 DNXGIDAD 0028 DNXGIDNT 0018 DNXGIDSP 002C DNXGINAM 001C DNXGINSZ 002C 00000016 DNXGIPT1 0018 DNXGIPT2 0024 DNXHCNT 0004 DNXHDAD 0000 DNXHDR 0000 DNXHDRSZ 0008 00000018 DNXHLABL 0008 DNXUIBIG 0018 DNXUIDAD 001C DNXUIDNT 0018 DNXUINSZ 001C 00000008 DNXUSBIG 0018 DNXUSDAD 0020 DNXUSNSZ 0020 0000000C DNXUSRNT 0018
Copyright IBM Corporation, 1990, 2001