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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
SDFBK
Control Block Contents
SDFBK DSECT
Cross Reference (Contains links to field and bit definitions)
SDFBK Prolog
NAME : HCPSDFBK
DESCRIPTION: SYSTEM DATA FILE BLOCK
DSECT : SDFBK
FUNCTION : THIS IS THE CONTROL BLOCK THROUGH WHICH USERS OF
SYSTEM DATA FILES COMMUNICATE WITH THE SPOOLING
SUBSYSTEM.
LOCATED BY : THE ADDRESS OF THE BLOCK IS MAINTAINED BY THE ROUTINES
WHICH UTILIZE SYSTEM DATA FILES, AND IS PASSED TO ALL
SYSTEM DATA FILE ROUTINES.
CREATED BY : HCPNSD - WHEN DEFINING A SYSTEM OR SEGMENT
HCPNSG - WHEN SAVING ANY SYSTEM DATA FILE
HCPNSI - WHEN LOADING ANY SYSTEM DATA FILE
HCPNSL - WHEN LOADING A SYSTEM OR SEGMENT
HCPNSN - TO PURGE SYSTEM DATA FILES
HCPNSQ - TO QUERY NSS/DCSS FILES
HCPNSR - WHEN OPENING AN IMAGE LIBRARY
HCPNSS - WHEN SAVING A SYSTEM OR SEGMENT
HCPTRD - AFTER OPENING A SYSTEM TRACE FILE
HCPUCR - WHEN OPENING A UCR FILE
DELETED BY : HCPNSD - AFTER DEFINING A SYSTEM OR SEGMENT
HCPNSG - AFTER SAVING ANY SYSTEM DATA FILE
HCPNSI - AFTER LOADING ANY SYSTEM DATA FILE
HCPNSN - AFTER PURGE SYSTEM DATA FILES
HCPNSP - WHEN PURGING A NSS OR DCSS
HCPNSQ - AFTER QUERYING NSS/DCSS FILES
HCPNSR - AFTER CLOSING AN IMAGE LIBRARY
HCPNSS - AFTER SAVING A SYSTEM OR SEGMENT
HCPTRD - AFTER CLOSING A SYSTEM TRACE FILE
HCPTSG - AFTER CLOSING A SYSTEM TRACE FILE
HCPUCR - AFTER CLOSING A UCR FILE
RELOCATION CONSIDERATIONS : None
SDFBK Control Block Content
SDFBK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SDFBK SYSTEM DATA FILE BLOCK 0000 0 Character 8 SDFFN FILE NAME 0008 8 Character 8 SDFFT FILE TYPE 0010 16 Character 8 SDFOWNER USERID OF FILE OWNER 0018 24 Character 8 SDFORIG USERID OF FILE ORIGINATOR 0020 32 Signed 4 SDFRECNT NUMBER OF RECORDS 0024 36 Signed 4 SDFPOS CURRENT RECORD POSITION IN THE FILE 0028 40 Signed 2 SDFRECSZ RECORD SIZE 002A 42 Signed 2 * RESERVED FOR FUTURE IBM USE 002C 44 Character 1 SDFCLASS FILE CLASS 002D 45 Bitstring 1 SDFSTAT FILE STATUS FLAG 1... .... SDFOPENR X'80' SDFOPENR FILE IS OPEN FOR READING .1.. .... SDFOPENW X'40' SDFOPENW FILE IS OPEN FOR WRITING ..1. .... SDFNORTN X'20' SDFNORTN File is marked NORETURN .... 1... SDFPURGE X'08' SDFPURGE FILE IS MARKED FOR PENDING PURGE .... .1.. SDFEOF X'04' SDFEOF FILE IS POSITIONED AT END 002E 46 Bitstring 1 SDFTYPE TYPE OF SYSTEM DATA FILE FLAG 00000080 SDFNSS X'80' SDFNSS File is a saved System or Segment. 00000040 SDFIMG X'40' SDFIMG IMAGE LIBRARY FILE 00000020 SDFTRF X'20' SDFTRF System Trace File (TRF) 00000010 SDFDMP X'10' SDFDMP SOFT ABEND DUMP FILE 00000008 SDFUCR X'08' SDFUCR Class Override file (UCR) 00000004 SDFNLS X'04' SDFNLS National Language file (NLS) 00000002 SDFVMDMP X'02' SDFVMDMP VM DUMP file 002F 47 Bitstring 1 SDFFLAG User data flags 1... .... SDFSECUR X'80' SDFSECUR This bit is used to provide security when SPTAPE DUMPing NSS/DCSS files. 0030 48 Bitstring 1 * (2) RESERVED FOR FUTURE IBM USE 0032 50 Signed 2 SDFIDNUM FILE IDENTIFICATION NUMBER 0034 52 Signed 4 * RESERVED FOR FUTURE IBM USE 0038 56 Signed 4 SDFRDBUF READ BUFFER ADDRESS 003C 60 Signed 4 SDFWRBUF WRITE BUFFER ADDRESS 0040 64 Signed 4 SDFCLTIM FIRST HALF OF TOD CLOCK WHEN THE FILE WAS CLOSED 0044 68 Signed 4 * RESERVED FOR FUTURE IBM USE 0048 72 Dbl-Word 8 SDFSCLAB SPOOL FILE SECLABEL 0050 80 Signed 4 SDFSPOOL (6) RESERVED AREA FOR SPOOL SUBSYSTEM 0068 104 Signed 4 SDFWORK (10) USER WORK AREA 00000012 SDFSIZE (*-SDFBK+7)/8 SIZE OF SDFBK IN DOUBLE WORDS 00000090 SDFBSIZE *-SDFBK SIZE OF SDFBK IN BYTES Mapping for SDFSPOOL field 0050 80 Signed 4 SDFSPABK Address of SPABK 0054 84 Signed 4 SDFSPFBK Address of SPFBK. This field is filled in while the SDF is open 0058 88 Bitstring 1 SDFSPLFL Spooling data file flag 1... .... SDFRDLST X'80' SDFRDLST For a file being written, the last record was read 0059 89 Bitstring 15 * Reserved for IBM use
SDFBK Storage Layout
*** SDFBK - SYSTEM DATA FILE BLOCK
*
* +-------------------------------------------------------+
* 0 | SDFFN |
* +-------------------------------------------------------+
* 8 | SDFFT |
* +-------------------------------------------------------+
* 10 | SDFOWNER |
* +-------------------------------------------------------+
* 18 | SDFORIG |
* +---------------------------+---------------------------+
* 20 | SDFRECNT | SDFPOS |
* +-------------+-------------+------+------+------+------+
* 28 | SDFRECSZ |/////////////|:CLASS|:STAT |:TYPE |:FLAG |
* +-------------+-------------+------+------+------+------+
* 30 |/////////////| SDFIDNUM |///////////////////////////|
* +-------------+-------------+---------------------------+
* 38 | SDFRDBUF | SDFWRBUF |
* +---------------------------+---------------------------+
* 40 | SDFCLTIM |///////////////////////////|
* +---------------------------+---------------------------+
* 48 | SDFSCLAB |
* +-------------------------------------------------------+
* 50 | |
* = SDFSPOOL =
* | |
* +-------------------------------------------------------+
* 68 | |
* = SDFWORK =
* | |
* +-------------------------------------------------------+
* 90
*
*** SDFBK - SYSTEM DATA FILE BLOCK
*** Overlay for SDFSPOOL in SDFBK
*
* +---------------------------+---------------------------+
* 50 | SDFSPABK | SDFSPFBK |
* +------+--------------------+---------------------------+
* 58 |:SPLFL|////////////////////////////////////////////////|
* +------+////////////////////////////////////////////////|
* |///////////////////////////////////////////////////////|
* +-------------------------------------------------------+
* 68
*
*** Overlay for SDFSPOOL in SDFBK
SDFBK Cross Reference
Symbol Dspl Value -------------- ---- ----- SDFBSIZE 0068 00000090 SDFCLASS 002C SDFCLTIM 0040 SDFDMP 002E 00000010 SDFEOF 002D 04 SDFFLAG 002F SDFFN 0000 SDFFT 0008 SDFIDNUM 0032 SDFIMG 002E 00000040 SDFNLS 002E 00000004 SDFNORTN 002D 20 SDFNSS 002E 00000080 SDFOPENR 002D 80 SDFOPENW 002D 40 SDFORIG 0018 SDFOWNER 0010 SDFPOS 0024 SDFPURGE 002D 08 SDFRDBUF 0038 SDFRDLST 0058 80 SDFRECNT 0020 SDFRECSZ 0028 SDFSCLAB 0048 SDFSECUR 002F 80 SDFSIZE 0068 00000012 SDFSPABK 0050 SDFSPFBK 0054 SDFSPLFL 0058 SDFSPOOL 0050 SDFSTAT 002D SDFTRF 002E 00000020 SDFTYPE 002E SDFUCR 002E 00000008 SDFVMDMP 002E 00000002 SDFWORK 0068 SDFWRBUF 003C
Copyright IBM Corporation, 1990, 2011