STPBK Back to Index page
 
Prolog 
Control Block Contents 
   STPBK 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.


  STPBK Prolog Top of page
  
 NAME       : SHARED TAPE DRIVE CONTROL BLOCK
 DESCRIPTION: SHARED-TAPE CONTROL BLOCK
 DSECT      : STPBK
 FUNCTION   : THIS CONTROL BLOCK MAPS SHARED TAPE DRIVE
              INFORMATION WHEN MULTIUSER IS SPECIFIED ON
              THE ATTACH CMD OR DEDICATE DIRECTORY STATEMENT.
 LOCATED BY : RDEVSTAP   SHARED TAPE BLOCK
 CREATED BY : HCPATDEV, HCPVRJDD
 DELETED BY : HCPDTDEV, HCPVRJLF, HCPVRJRL
 
 
  STPBK Control Block Content Top of page
  




 STPBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      STPBK          SHARED-TAPE CONTROL BLOCK
     **      FIELDS FOR ATTACH / DETACH
0000    0 Dbl-Word     8 STPALOCK (3)   Lock for field STPASIGN
0018   24 Signed       4 STPASIGN       Guest VDEV holding the Assign
001C   28 Bitstring   48 *              Reserved for future IBM use
004C   76 Bitstring    1 STPFLAG        Shared Tape miscellaneous bits
004D   77 Bitstring    3 *              Reserved for IBM use
0050   80 Signed       4 *              Reserved for IBM use
0054   84 Signed       4 STPVDEV        USERS VDEV
          0000000B       STPDWSIZ       ((*-STPBK+7)/8) SIZE IN DWS FOR
                                        FREE/FRET
 
 
  STPBK Storage Layout Top of page
  
          
*** STPBK - SHARED-TAPE CONTROL BLOCK
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       STPALOCK                        =
*     |                                                       |
*     +---------------------------+---------------------------+
*  18 |         STPASIGN          |///////////////////////////|
*     +---------------------------+///////////////////////////|
*  20 |///////////////////////////////////////////////////////|
*     =///////////////////////////////////////////////////////=
*     |///////////////////////////+------+--------------------+
*  48 |///////////////////////////|:FLAG |////////////////////|
*     +---------------------------+------+--------------------+
*  50 |///////////////////////////|         STPVDEV           |
*     +---------------------------+---------------------------+
*  58
*
*** STPBK - SHARED-TAPE CONTROL BLOCK
 
 
  STPBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
STPALOCK       0000
STPASIGN       0018
STPDWSIZ       0054 0000000B
STPFLAG        004C
STPVDEV        0054
 
This information is based on z/VM 7.1.0 Last updated on 22 Jun 2018 at 11:53:00 EDT.
Copyright IBM Corporation, 1990, 2018