IUCVB

Prolog  

Control Block Contents  
   IUCVB DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

IUCVB Prolog

 NAME       : HCPIUCVB
 DESCRIPTION: IUCV CONTROL BLOCK
 DSECT      : IUCVB
 FUNCTION   : THIS CONTROL BLOCK DEFINES THE INTER-USER COMMUNICATIONS
              VEHICLE CONTROL BLOCK FOR AN IUCV USER.
 LOCATED BY : -VMDIUCV FIELD OF HCPVMDBK FOR VIRTUAL MACHINES
              -CALL TO HCPIUGAI FOR CP SYSTEM SERVICES
 CREATED BY : IUCV DECLARE BUFFER FUNCTION - HCPIUJDB
 DELETED BY : IUCV RETRIEVE BUFFER FUNCTION - HCPIUERB
 NOTES      : The following fields are valid in the base IUCVB only (all
              other fields are valid in the base and local IUCVBs):
    IUCVCCT   - Pointer to user's CCTBK
    IUCVBWIN  - Dispatch window event count
    IUCMXCN   - Maximum number of connections
    IUCPNDHD  - Pending control interrupt queue head
    IUCPNDTL  - Pending control interrupt queue tail
    IUCVSTAT  - IUCV status
    IUCANYFL  - *IDENT authorization particulars
    IUCTOTCN  - Total number of connections
    IUCVBCPX  - CPEBK for HCPIVKRS call
    IUCBUFCT  - Buffer counts

IUCVB Control Block Content

IUCVB DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      IUCVB          IUCV CONTROL BLOCK
0000    0 Address      4 IUCVMB         ADDRESS OF VMDBK
0004    4 Address      4 IUCBFAD1       ADDRESS OF EXTERNAL BUFFER
0008    8 Address      4 IUCBFAD2       2ND PAGE OF EXTERNAL BUFFER
000C   12 Signed       2 IUCBFLN1       LENGTH OF BUFF IN 1ST PAGE - 1
000E   14 Signed       2 IUCBFLN2       LENGTH OF BUFF IN 2ND PAGE - 1
0010   16 Address      4 IUCCBFA1       ADDRESS OF EXTERNAL CNTL BUFFER
0014   20 Address      4 IUCCBFA2       2ND PAGE OF EXTERNAL CNTL BUFFER
0018   24 Signed       2 IUCCBFL1       LENGTH OF CNTL BUFF IN 1ST PAGE
001A   26 Signed       2 IUCCBFL2       LENGTH OF CNTL BUFF IN 2ND PAGE
001C   28 Address      4 IUCVCCT        POINTER TO THE USER'S CCT
0020   32 Bitstring    1 IUCVBWIN       Dispatch window event count
          1... ....      IUCVBMAX       X'80' Event threshhold value
          .1.. ....      IUCVBFRE       X'40' Free storage threshhold
                                        count
0021   33 Bitstring    1 *              RESERVED
     NOTES : The event threshhold for IUCVBWIN is actually x'100'. For
     performance reasons IUCVBMAX has been defined as an equate so that a TM
     cam be used to test for the threshhold.
0022   34 Signed       2 IUCMXCN        MAX NUM OF CONN FROM DIRECTORY OR
                                        DEFAULT
0024   36 Signed       4 IUCPNDHD       PENDING CONTROL INT QUEUE HEAD
0028   40 Signed       4 IUCPNDTL       PENDING CONTROL INT QUEUE TAIL
002C   44 Bitstring    1 IUCVSTAT       IUCV STATUS
          1... ....      IUCVWAIT       X'80' IUCV WAIT
          .1.. ....      IUCIDENT       X'40' CONNECT TO *IDENT
                                        AUTHORIZED
          ..1. ....      IUCCPBUF       X'20' CP CREATED IUCVB
          ...1 ....      IUCBROUT       X'10' VIRTUAL MACHINE IS BREAKING
                                        OUT
          .... 1...      IUCBUFA        X'08' Application buffer exists
                                        in complex
          .... .1..      IUCBUFC        X'04' Control buffer exists in
                                        complex
002D   45 Bitstring    1 IUCANYFL       *IDENT AUTHORIZATION PARTICULARS
          1... ....      IUCANYLI       X'80' RESANY LOCAL IDENTIFY
          .1.. ....      IUCANYLR       X'40' RESANY LOCAL REVOKE
          ..1. ....      IUCANYGI       X'20' RESANY GLOBAL IDENTIFY
          ...1 ....      IUCANYGR       X'10' RESANY GLOBAL REVOKE
          .... 1...      IUCANYWI       X'08' GATEANY IDENTIFY
          .... .1..      IUCANYWR       X'04' GATEANY REVOKE
          .... ..1.      IUCANYRE       X'02' RESANY AUTHORITY CHECKED
          .... ...1      IUCANYGT       X'01' GATEANY AUTHORITY CHECKED
002E   46 Signed       2 IUCTOTCN       TOTAL NUMBER OF CONNECTIONS
0030   48 Address      4 IUCIBFA1       FIRST PAGE-INTERRUPT BUFFER EXT
0034   52 Address      4 IUCIBFA2       SECOND PAGE-INTERRUPT BUFFER EXT
0038   56 Signed       2 IUCIBFL1       INTERRUPT BUFFER EXT LEN - PG 1
003A   58 Signed       2 IUCIBFL2       INTERRUPT BUFFER EXT LEN - PG 2
003C   60 Signed       4 IUCVBCPX       CPEBK for HCPIVKRS call
0040   64 Bitstring    1 IUCAPIN        IUCV interrupts enabled
          1... ....      IUCSNDN        X'80' IUCV Non-priority msgs
                                        enabled
          .1.. ....      IUCSNDP        X'40' IUCV priority messages
                                        enabled
          ..1. ....      IUCRPYN        X'20' IUCV non-priority reply
                                        enabled
          ...1 ....      IUCRPYP        X'10' IUCV priority replies
                                        enabled
          .... 1...      IUCICTRL       X'08' IUCV control interrupts
                                        enabled
0041   65 Bitstring    1 IUCTLIN        IUCV control interrupts enabled
          1... ....      IUCCLPC        X'80' Pending connections enabled
          .1.. ....      IUCCLCC        X'40' Complete connections
                                        enabled
          ..1. ....      IUCCLPS        X'20' Sever interrupts enabled
          ...1 ....      IUCCLPQ        X'10' Quiesce interrupts enabled
          .... 1...      IUCCLPR        X'08' Resume interrupts enabled
0042   66 Signed       2 *              Reserved
     IUCBUFCT contains both buffer counts. This enables the code to test if
     both of these fields are zero at the same time. IUCAPBCT and IUCTLBCT
     must be kept together.
0044   68 Signed       4 IUCBUFCT (0)   Buffer counts
0044   68 Signed       2 IUCAPBCT       Count of the number of
                                        application buffers declared in
                                        the complex
0046   70 Signed       2 IUCTLBCT       Count of the number of control
                                        buffers declared in the complex
     Constant values used throughout IUCV
          00004000       IUCINTC        X'4000' IUCV Interrupt code
          0000001E       IUCR0MSK       30 IUCV CR0 mask bit
          00000009       IUCSIZE        (*-IUCVB+7)/8 IUCVB SIZE IN
                                        DOUBLEWORDS

IUCVB Storage Layout

          
*** IUCVB - IUCV CONTROL BLOCK
*
*     +---------------------------+---------------------------+
*   0 |          IUCVMB           |         IUCBFAD1          |
*     +---------------------------+-------------+-------------+
*   8 |         IUCBFAD2          |  IUCBFLN1   |  IUCBFLN2   |
*     +---------------------------+-------------+-------------+
*  10 |         IUCCBFA1          |         IUCCBFA2          |
*     +-------------+-------------+---------------------------+
*  18 |  IUCCBFL1   |  IUCCBFL2   |         IUCVCCT           |
*     +------+------+-------------+---------------------------+
*  20 |:VBWIN|//////|  IUCMXCN    |         IUCPNDHD          |
*     +------+------+-------------+------+------+-------------+
*  28 |         IUCPNDTL          |:VSTAT|:ANYFL|  IUCTOTCN   |
*     +---------------------------+------+------+-------------+
*  30 |         IUCIBFA1          |         IUCIBFA2          |
*     +-------------+-------------+---------------------------+
*  38 |  IUCIBFL1   |  IUCIBFL2   |         IUCVBCPX          |
*     +------+------+-------------+-------------+-------------+
*  40 |:APIN |:TLIN |/////////////|  IUCAPBCT   |  IUCTLBCT   |
*     +------+------+-------------+-------------+-------------+
*  48
*
*** IUCVB - IUCV CONTROL BLOCK

IUCVB Cross Reference

Symbol         Dspl Value
-------------- ---- -----
IUCANYFL       002D
IUCANYGI       002D 20
IUCANYGR       002D 10
IUCANYGT       002D 01
IUCANYLI       002D 80
IUCANYLR       002D 40
IUCANYRE       002D 02
IUCANYWI       002D 08
IUCANYWR       002D 04
IUCAPBCT       0044
IUCAPIN        0040
IUCBFAD1       0004
IUCBFAD2       0008
IUCBFLN1       000C
IUCBFLN2       000E
IUCBROUT       002C 10
IUCBUFA        002C 08
IUCBUFC        002C 04
IUCBUFCT       0044
IUCCBFA1       0010
IUCCBFA2       0014
IUCCBFL1       0018
IUCCBFL2       001A
IUCCLCC        0041 40
IUCCLPC        0041 80
IUCCLPQ        0041 10
IUCCLPR        0041 08
IUCCLPS        0041 20
IUCCPBUF       002C 20
IUCIBFA1       0030
IUCIBFA2       0034
IUCIBFL1       0038
IUCIBFL2       003A
IUCICTRL       0040 08
IUCIDENT       002C 40
IUCINTC        0046 00004000
IUCMXCN        0022
IUCPNDHD       0024
IUCPNDTL       0028
IUCRPYN        0040 20
IUCRPYP        0040 10
IUCR0MSK       0046 0000001E
IUCSIZE        0046 00000009
IUCSNDN        0040 80
IUCSNDP        0040 40
IUCTLBCT       0046
IUCTLIN        0041
IUCTOTCN       002E
IUCVBCPX       003C
IUCVBFRE       0020 40
IUCVBMAX       0020 80
IUCVBWIN       0020
IUCVCCT        001C
IUCVMB         0000
IUCVSTAT       002C
IUCVWAIT       002C 80