Programming Interface Information: This information is NOT intended to be used as Programming Interfaces of z/VM.

#### TDHBK

Prolog

Control Block Contents
TDHBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### TDHBK Prolog

     NAME       : HCPTDHBK
     DESCRIPTION: TRACE SERVICE TOOL DIAGNOSE READ HEADER BLOCK
     DSECT      : TDHBK
     FUNCTION   : CONTAINS HEADER INFORMATION FOR DATA RELATED TO
                  PROCESSING A DIAG X'E0'.
     LOCATED BY : VMDTDHBK
     CREATED BY : HCPTSD when processing a Diagnose x'E0' open request.
     DELETED BY : HCPTSD when processing a Diagnose x'E0' close request.
                  HCPTSGDF when user is logging off.
     EMPLOYED BY  HCPTSD when processing a Diagnose x'E0' for
                  open, read or close requests.
     REFERENCES : None
     COMMENTS   : None

#### TDHBK Control Block Content

#### TDHBK DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      TDHBK          TRACE SERVICE TOOL DIAGNOSE READ HEADER BLOCK
    0000    0 Character   24 TDHLCK         TDR chain lock
    0018   24 Address      4 TDHTDRBK       TDR chain anchor
    001C   28 Bitstring    1 TDH$END (0)    Defines end of control blk

#### TDHBK Storage Layout

    *** TDHBK - TRACE SERVICE TOOL DIAGNOSE READ HEADER BLOCK
    *
    *     +-------------------------------------------------------+
    *   0 |                                                       |
    *     =                        TDHLCK                         =
    *     |                                                       |
    *     +---------------------------+---------------------------+
    *  18 |         TDHTDRBK          |
    *     +---------------------------+
    *
    *** TDHBK - TRACE SERVICE TOOL DIAGNOSE READ HEADER BLOCK

#### TDHBK Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    TDH$END        001C
    TDHLCK         0000
    TDHTDRBK       0018

This information is based on z/VM V6R1.0. Last updated on 18 Feb 2010 at 09:18:07 EDT.
Copyright IBM Corporation, 1990, 2008