CKPBK Back to Index page
 
Prolog 
Control Block Contents 
   CKPBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  CKPBK Prolog Top of page
 
 NAME       : HCPCKPBK
 DESCRIPTION: SYSTEM CHECK POINT CONTROL BLOCK
 DSECT      : CKPBK
 FUNCTION   : DOCUMENTS THE PROGRESS OF THE CHECKPOINT PROCESS BY
              RECORDING THE STARTING AND ENDING TIMES OF EACH DATA
              COLLECTION, THE DASD EXTENT OF THE COLLECTED DATA, AND
              THE DASD LOCATION OF THAT DATA.  THUS, THE CKPBK CHECKPOINTS
              THE PROGRESS OF THE CHECKPOINT PROCESS WHILE MAINTAINING A
              DIRECTORY OF THE DATA FILES CREATED DURING THAT PROCESS.
 LOCATED BY : SYSCKPS - POINTER TO FIRST CHECKPOINT CYLINDER ON SYSRES
              ON WHICH THE CKPBK IS THE FIRST RECORD
 CREATED BY : HCPCKPSH - DURING SYSTEM SHUTDOWN OR ABNORMAL TERMINATION
              HCPCKPRS - BEFORE SYSTEM INITIALIZATION
 DELETED BY : NEVER DELETED; ALWAYS REFRESHED
 RELOCATION CONSIDERATIONS : None
 
 
  CKPBK Control Block Content Top of page
 

 CKPBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure CKPBK SYSTEM CHECK POINT CONTROL BLOCK CHECKPOINT ENTRY STATUS DESCRIPTORS 0000 0 Character 8 CKPBKID EYECATCHER FOR IDENTIFICATION 0008 8 Dbl-Word 8 CKPBKSUM (3) OVERALL CHECKPOINT STATUS 0020 32 Dbl-Word 8 CKPENAB (3) RDEV ENABLE STATUS 0038 56 Dbl-Word 8 CKPLOGM (3) LOG MESSAGES 0050 80 Dbl-Word 8 CKPHOLDQ (3) HOLD QUEUES 0068 104 Dbl-Word 8 CKPCPVL (3) CPVOL BLOCKS 0080 128 Dbl-Word 8 CKPRSPB (3) RSPBLOKS 0098 152 Dbl-Word 8 CKPSACCT (3) RESIDUAL ACCOUNTING RECORDS 00B0 176 Dbl-Word 8 CKPCACCT (3) GENERATED ACCOUNTING RECORDS 00C8 200 Dbl-Word 8 CKPDELQ (3) DELETE QUEUE MISCELLANEOUS CHECKPOINT DATA ITEMS 00E0 224 Signed 4 CKPVLMAX HIGHEST CPVOL USED AT SHUTDOWN 00E4 228 Signed 4 CKPDSPID SYSTEM ABEND DUMP SPOOL FILE ID 00E8 232 Signed 4 CKPNSPID NEXT AVAILABLE SYSTEM SPOOL FILE ID 00EC 236 Signed 4 CKPCKSEQ Clock Sequence number. Used by diagnose x'238'. POWEROFF Checkpoint Data Item 00F0 240 Signed 4 CKPPWROF Will contain C'POWR' if active or 'PMPT' if Prompt requested 00000000 CKPTIME1 0,8 START TIME 00000008 CKPTIME2 CKPTIME1+L'CKPTIME1,L'CKPTIME1 END TIME 00000010 CKPBLKS CKPTIME2+L'CKPTIME2,4 START BLOCK 00000014 CKPBLKN CKPBLKS+L'CKPBLKS,L'CKPBLKS BLOCK COUNT 00000018 CKPENTLN (((CKPBLKN+L'CKPBLKN)-CKPTIME1+7) /8)*8 0000001F CKPSIZE (*-CKPBK+7)/8 CKPBK SIZE IN DOUBLE-WORDS
 
 
  CKPBK Storage Layout Top of page
 
          
*** CKPBK - SYSTEM CHECK POINT CONTROL BLOCK
*
*     +-------------------------------------------------------+
*   0 |                       CKPBKID                         |
*     +-------------------------------------------------------+
*   8 |                                                       |
*     =                       CKPBKSUM                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  20 |                                                       |
*     =                       CKPENAB                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  38 |                                                       |
*     =                       CKPLOGM                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  50 |                                                       |
*     =                       CKPHOLDQ                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  68 |                                                       |
*     =                       CKPCPVL                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  80 |                                                       |
*     =                       CKPRSPB                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  98 |                                                       |
*     =                       CKPSACCT                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  B0 |                                                       |
*     =                       CKPCACCT                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  C8 |                                                       |
*     =                       CKPDELQ                         =
*     |                                                       |
*     +---------------------------+---------------------------+
*  E0 |         CKPVLMAX          |         CKPDSPID          |
*     +---------------------------+---------------------------+
*  E8 |         CKPNSPID          |         CKPCKSEQ          |
*     +---------------------------+---------------------------+
*  F0 |         CKPPWROF          | F4
*     +---------------------------+
*
*** CKPBK - SYSTEM CHECK POINT CONTROL BLOCK
 
 
  CKPBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
CKPBKID        0000
CKPBKSUM       0008
CKPBLKN        00F0 00000014
CKPBLKS        00F0 00000010
CKPCACCT       00B0
CKPCKSEQ       00EC
CKPCPVL        0068
CKPDELQ        00C8
CKPDSPID       00E4
CKPENAB        0020
CKPENTLN       00F0 00000018
CKPHOLDQ       0050
CKPLOGM        0038
CKPNSPID       00E8
CKPPWROF       00F0
CKPRSPB        0080
CKPSACCT       0098
CKPSIZE        00F0 0000001F
CKPTIME1       00F0 00000000
CKPTIME2       00F0 00000008
CKPVLMAX       00E0
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:48:07 EDT.
Copyright IBM Corporation, 1990, 2022