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

#### IUCVTAB

Prolog

Control Block Contents
IUCVTAB DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

#### IUCVTAB Prolog

     Name       : IUCVTAB
     Description: IUCV Control Block
     DSECT      : IUCVTAB
     Function   : Define storage for APPC/VM, IUCV,
                  and private resource processing in DMSNUC.
                  Provide a layout (DSECT) of the IUCV Control
                  Table in other CMS routines. AIUCVTAB in NUCON
                  contains the address of IUCVTAB.

#### IUCVTAB Control Block Content

#### IUCVTAB DSECT

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      IUCVTAB        IUCV Control Block
    0000    0 Address      4 IUCVPTAN       ANCHOR OF PATH TABLE CHAIN
    0004    4 Address      4 IUCVSAVE       POINTER TO A 23 BYTE SAVE AREA
    0008    8 Address      4 IUCVPLST       POINTER TO A PLIST FOR IUCV
    000C   12 Address      4 IUCVEXBF       POINTER TO EXTERNAL INTERRUPT
                                            BUFFER
    0010   16 Address      4 IUCVCTBF       POINTER TO CONTROL EIB
          NOTES      : the following field, IUCVBKSZ, used to be the size in
                DWORDS of a contiguous block of storage that was
                obtained.  Now it is the sum of the size of the path
                table (above 16Mb line) and the rest of the stuff (
                below the line).  Effectively, the value contained in
                IUCVBKSZ has not changed, however, you need to
                remember that this length does not represent a
                contiguous block starting at IUCVPTAN.  Now IUCVPTAN
                points to the path table above the 16Mb line and
                IUCVSAVE effectively points to the start of the block
                below the line.
    0014   20 Signed       4 IUCVBKSZ       Size of allocated block in DWs
    0018   24 Address      4 IUCVIDAN       ANCHOR OF PROGRAM IDENTITY CHAIN
    001C   28 Signed       2 IUCVCONN       MAXIMUM NUMBER OF IUCV CONNECTS
    001E   30 Bitstring    1 IUCVSETF       INDICATES IF !CMS'S SET WORKED
    001F   31 Bitstring    1 IUCVACTV       INDICATES IF USERS OTHER THAN
                                            !CMS HAVE DONE HNDIUCV SETS
    0020   32 Address      4 IUCVPFST       Pointer to first PSIB entry
    0024   36 Address      4 IUCVPLAS       Pointer to last PSIB entry
    0028   40 Address      4 IUCVIUCA       Pointer to DMSIUC save area
    002C   44 Address      4 IUCVPSVA       Pointer to DMSPSV save area
    0030   48 Character    8 IUCVMOD        CMS-invokable name (DMSPSVV)
    0038   56 Character    8 IUCVRNAM (0)   Resource id invoked by DMSINT
    0038   56 Bitstring    8 *              INITIALIZE TO BINARY 0
    0040   64 Character    8 IUCVUSID (0)   Userid requesting IUCVRNAM
    0040   64 Bitstring    8 *              INITIALIZE TO BINARY 0
    0048   72 Address      4 IUCVAPAN       Active conversation anchor
    004C   76 Address      4 IUCVPIBE       Pointer to IBE
    0050   80 Address      4 IUCVCSL        Addr of block of FPI workarea
                                            pointers for CSL calls
    0054   84 Address      4 IUCVPIP        PIP data storage blk pointer
    0058   88 Address      4 IUCVPPIP       Private PIP data pointer
    005C   92 Address      4 IUCVCPED       Pointer to CPED storage blk
    0060   96 Address      4 IUCVCLDP       Pointer to CMS log data plist
    0064  100 Address      4 IUCVCRDS       Pointer to DMSCRD savearea
    0068  104 Address      4 IUCVIUHS       Pointer to DMSIUH savearea
    006C  108 Signed       2 IUCVLCPE       Length of CPED (DWs
    006E  110 Signed       2 IUCVLPIP       Length of PIP data (DWs
    0070  112 Signed       2 IUCVLPPP       Length of Private PIP data(DWs
    0072  114 Signed       2 IUCVLIBE       Length of IBE (DWs ** NOTES : The
                                            following two fields must remain
                                            together
    0074  116 Character    8 IUCVPCA (0)    PCA exit name
    0074  116 Character    8 *              INITIALIZE
    007C  124 Character    9 IUCVBACK (0)   CSL routine for Backout_Req'd
    007C  124 Character    9 *              INITIALIZE
    0085  133 Bitstring    1 IUCVPFLG       Private server flags
              1... ....      IUCVCOMC       X'80' DMSINT call for next
                                            command
              .... 1...      IUCVSLIH       X'08' IUCV SLIH drive active
              .... ..1.      IUCVPVUN       X'02' Check unique LUWID's
              .... ...1      IUCVPVEX       X'01' DMSINT invoked private
                                            server
    0086  134 Bitstring    1 IUCVCFL1       PCA and CMS PCA Flag 1
              1... ....      IUCVGPD        X'80' Got PIP Data
              .1.. ....      IUCVGPPD       X'40' Got Private PIP Data
              ..1. ....      IUCVTSAF       X'20' TSAF virtual machine
              ...1 ....      IUCVGCPE       X'10' Got CPED block
              .... 1...      IUCVCVSV       X'08' Conversation severed flag
    0087  135 Bitstring    1 IUCVRFLG       Recursion flags
              1... ....      IUCVPSEV       X'80' Path severing flag
    0088  136 Signed       4 IUCVWUID       Private server workunit ID
    008C  140 Bitstring    4 *              Reserved for future use
    0090  144 Dbl-Word     8 IUCVPARM (5)   IUCV parameter list
              00000017       IUCVSIZE       (*-IUCVTAB+7)/8 SIZE OF IUCVTAB
                                            IN DOUBLEWORDS
              000000B8       IUCVSIZB       IUCVSIZE*8 Size of IUCVTAB in
                                            Bytes
              00000006       IUCVPSVL       6 DMSPSV save area size (DWs)
              00000006       IUCVIUCL       6 DMSIUC reg save size (DWs)
              00000009       IUCVPUXL       9 User exit save area size (DWs)
              00000009       IUCVCRDL       9 DMSCRD save area size (DWs)
              00000009       IUCVIUHL       9 DMSIUH save area size (DWs)

#### IUCVTAB Storage Layout

    *** IUCVTAB - IUCV Control Block
    *
    *     +---------------------------+---------------------------+
    *   0 |         IUCVPTAN          |         IUCVSAVE          |
    *     +---------------------------+---------------------------+
    *   8 |         IUCVPLST          |         IUCVEXBF          |
    *     +---------------------------+---------------------------+
    *  10 |         IUCVCTBF          |         IUCVBKSZ          |
    *     +---------------------------+-------------+------+------+
    *  18 |         IUCVIDAN          |  IUCVCONN   |:VSETF|:VACTV|
    *     +---------------------------+-------------+------+------+
    *  20 |         IUCVPFST          |         IUCVPLAS          |
    *     +---------------------------+---------------------------+
    *  28 |         IUCVIUCA          |         IUCVPSVA          |
    *     +---------------------------+---------------------------+
    *  30 |                       IUCVMOD                         |
    *     +-------------------------------------------------------+
    *  38 |///////////////////////////////////////////////////////|
    *     +-------------------------------------------------------+
    *  40 |///////////////////////////////////////////////////////|
    *     +---------------------------+---------------------------+
    *  48 |         IUCVAPAN          |         IUCVPIBE          |
    *     +---------------------------+---------------------------+
    *  50 |         IUCVCSL           |         IUCVPIP           |
    *     +---------------------------+---------------------------+
    *  58 |         IUCVPPIP          |         IUCVCPED          |
    *     +---------------------------+---------------------------+
    *  60 |         IUCVCLDP          |         IUCVCRDS          |
    *     +---------------------------+-------------+-------------+
    *  68 |         IUCVIUHS          |  IUCVLCPE   |  IUCVLPIP   |
    *     +-------------+-------------+-------------+-------------+
    *  70 |  IUCVLPPP   |  IUCVLIBE   |///////////////////////////|
    *     +-------------+-------------+---------------------------+
    *  78 |///////////////////////////|///////////////////////////|
    *     +---------------------------+//////+------+------+------+
    *  80 |//////////////////////////////////|:VPFLG|:VCFL1|:VRFLG|
    *     +---------------------------+------+------+------+------+
    *  88 |         IUCVWUID          |///////////////////////////|
    *     +---------------------------+---------------------------+
    *  90 |                                                       |
    *     =                       IUCVPARM                        =
    *     |                                                       |
    *     +-------------------------------------------------------+
    *  B8
    *
    *** IUCVTAB - IUCV Control Block

#### IUCVTAB Cross Reference

    Symbol         Dspl Value
    -------------- ---- -----
    IUCVACTV       001F
    IUCVAPAN       0048
    IUCVBACK       007C
    IUCVBKSZ       0014
    IUCVCFL1       0086
    IUCVCLDP       0060
    IUCVCOMC       0085 80
    IUCVCONN       001C
    IUCVCPED       005C
    IUCVCRDL       0090 00000009
    IUCVCRDS       0064
    IUCVCSL        0050
    IUCVCTBF       0010
    IUCVCVSV       0086 08
    IUCVEXBF       000C
    IUCVGCPE       0086 10
    IUCVGPD        0086 80
    IUCVGPPD       0086 40
    IUCVIDAN       0018
    IUCVIUCA       0028
    IUCVIUCL       0090 00000006
    IUCVIUHL       0090 00000009
    IUCVIUHS       0068
    IUCVLCPE       006C
    IUCVLIBE       0072
    IUCVLPIP       006E
    IUCVLPPP       0070
    IUCVMOD        0030
    IUCVPARM       0090
    IUCVPCA        0074
    IUCVPFLG       0085
    IUCVPFST       0020
    IUCVPIBE       004C
    IUCVPIP        0054
    IUCVPLAS       0024
    IUCVPLST       0008
    IUCVPPIP       0058
    IUCVPSEV       0087 80
    IUCVPSVA       002C
    IUCVPSVL       0090 00000006
    IUCVPTAN       0000
    IUCVPUXL       0090 00000009
    IUCVPVEX       0085 01
    IUCVPVUN       0085 02
    IUCVRFLG       0087
    IUCVRNAM       0038
    IUCVSAVE       0004
    IUCVSETF       001E
    IUCVSIZB       0090 000000B8
    IUCVSIZE       0090 00000017
    IUCVSLIH       0085 08
    IUCVTSAF       0086 20
    IUCVUSID       0040
    IUCVWUID       0088

This information is based on z/VM V5R2.0.
Last updated on 6 Dec 2005 at 15:41:07 EDT.
Copyright IBM Corporation, 1990, 2005