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 7.2.0 Last updated on 24 Jun 2020 at 09:30:53 EDT.
Copyright IBM Corporation, 1990, 2020