CPOBK Back to Index page
 
Prolog 
Control Block Contents 
   CPOBK DSECT
   CPOBUF DSECT
   CPOREC 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.

 
  CPOBK Control Block Content Top of page
  




 CPOBK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CPOBK
0000    0 Character    4 CPOEYE         Eye catcher "CPO"
0004    4 Address      4 CPOBUF@        Buffer chain address
0008    8 Address      4 CPOREC@        Next record to "print"
000C   12 Signed       4 * (0)          Allignment for CPOFLAG updates
                                        using CS
000C   12 Bitstring    1 CPOFLAG        Flag byte
          1... ....      CPOFRAD        X'80' CPOFRAD Output for R_Admin,
                                        leave in buffer
          .1.. ....      CPOFOUT        X'40' CPOFOUT An instance of
                                        RPIVPC00 is alreay doing send
000D   13 Bitstring    3 *              Padding for CPOFLAG updates using
                                        CS
          00000010       CPOLEN         *-CPOBK Length




 CPOBUF DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CPOBUF
0000    0 Address      4 CPONXT@        Next buffer address (or offset in
                                        PP5DATA)
0004    4 Signed       4 CPOBLEN        Buffer length
0008    8 Signed       4 CPOROFF        Offset after last record
000C   12 Character    1 CPORECS (0)    Output records ( Mapped by
                                        CPOREC)
          0000000C       CPOBHLEN       *-CPOBUF Length of buffer header
          00000040       CPOLASTL       64 Space for final message from
                                        RPIVPC00 / RPIMGR




 CPOREC DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CPOREC
0000    0 Signed       2 CPORLEN        Record length
0002    2 Character    1 CPORDATA (0)   Output record
 
 
  CPOBK Storage Layout Top of page
  
          
*** CPOBK - Control Block in CPOBK
*
*     +---------------------------+---------------------------+
*   0 |          CPOEYE           |         CPOBUF@           |
*     +---------------------------+------+--------------------+
*   8 |         CPOREC@           |:FLAG |////////////////////|
*     +---------------------------+------+--------------------+
*  10
*
*** CPOBK - Control Block in CPOBK
          
*** CPOBUF - Control Block in CPOBK
*
*     +---------------------------+---------------------------+
*   0 |         CPONXT@           |         CPOBLEN           |
*     +---------------------------+---------------------------+
*   8 |         CPOROFF           |
*     +---------------------------+
*
*** CPOBUF - Control Block in CPOBK
          
*** CPOREC - Control Block in CPOBK
*
*     +-------------+
*   0 |  CPORLEN    |
*     +-------------+
*
*** CPOREC - Control Block in CPOBK
 
 
  CPOBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
CPOBHLEN       000C 0000000C
CPOBLEN        0004
CPOBUF@        0004
CPOEYE         0000
CPOFLAG        000C
CPOFOUT        000C 40
CPOFRAD        000C 80
CPOLASTL       000C 00000040
CPOLEN         000D 00000010
CPONXT@        0000
CPORDATA       0002
CPOREC@        0008
CPORECS        000C
CPORLEN        0000
CPOROFF        0008
 
This information is based on z/VM 7.5.0 Last updated on 22 Jun 2026 at 11:17:20 EDT.
Copyright IBM Corporation, 1990, 2026