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 6.4.0 Last updated on 24 Aug 2016 at 09:44:10 EDT.
Copyright IBM Corporation, 1990, 2016