IBM: CCTBK

Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

CCTBK

Prolog

Control Block Contents

CCTBK DSECT

Storage Layout

Cross Reference (Contains links to field and bit definitions)

CCTBK Prolog

 NAME       : HCPCCTBK
 DESCRIPTION: Communications Control Table
 DSECT      : CCTBK
 FUNCTION   : THIS CONTROL BLOCK DEFINES THE COMMUNICATION CONTROL
              TABLE FOR AN IUCV USER.
 LOCATED BY : IUCVCCT FIELD OF HCPIUCVB
 CREATED BY : HCPIUJDB - IUCV DECLARE BUFFER FUNCTION
 DELETED BY : HCPIUERB - IUCV RETRIEVE BUFFER FUNCTION

CCTBK Control Block Content


CCTBK DSECT
Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      CCTBK          Communications Control Table
0000    0 Signed       2 CCTMXPID       CURRENT MAX PATH ID FOR THIS CCT
0002    2 Bitstring    1 *              Reserved
0003    3 Bitstring    1 CCTFLAG2       IUCV INTERRUPTS PENDING
          1... ....      CCTPNDSN       X'80' IUCV NON-PRIORITY MSGS
                                        PENDING
          .1.. ....      CCTPNDSP       X'40' IUCV PRIORITY MESSAGES
                                        PENDING
          ..1. ....      CCTPNDRN       X'20' IUCV NON-PRIORITY REPLIES
                                        PENDING
          ...1 ....      CCTPNDRP       X'10' IUCV PRIORITY REPLIES
                                        PENDING
          .... 1...      CCTPNDCT       X'08' IUCV CONTROL INTERRUPT
                                        PENDING
0004    4 Address      4 CCTIUCV        POINTER TO THE USER'S IUCVBK
0008    8 Address      4 CCTSNDHD       SEND QUEUE HEAD
000C   12 Address      4 CCTSNDTL       SEND QUEUE TAIL
0010   16 Address      4 CCTSNDPR       SEND PRIORITY QUEUE TAIL
0014   20 Address      4 CCTRCVHD       RECEIVE QUEUE HEAD
0018   24 Address      4 CCTRCVTL       RECEIVE QUEUE TAIL
001C   28 Address      4 CCTRPYHD       REPLY QUEUE HEAD
0020   32 Address      4 CCTRPYTL       REPLY QUEUE TAIL
0024   36 Address      4 CCTRPYPR       REPLY PRIORITY QUEUE TAIL
0028   40 Signed       4 CCTMSGCT       TOTAL MSGS SENT ON ALL PATHS
002C   44 Bitstring    1 *              Reserved
002D   45 Bitstring    1 CCTCPSYS       CP SYSTEM SERVICE CODE
     NOTES : SYSTEM SERVICE CODES MUST MATCH WITH THE SAME VALUES LISTED IN
     CSSTABLE ENTRIES IN HCPIUG AND VALUES USED TO INITIALIZE IPCPSYS IN THE
     IUCV MACRO
          .... .111      CCTSSCCS       X'07' CODE FOR *CCS SYSTEM
                                        SERVICE
002E   46 Bitstring    1 CCTSTAT        STATUS
          1... ....      CCTRTVBF       X'80' RETRIEVE BUFFER IN PROGRESS
          .1.. ....      CCTSYNC        X'40' ABLE TO PROCESS SYNC SENDS
          ..1. ....      CCTCPINT       X'20' CP server interrupt in
                                        progress
          ...1 ....      CCTSTKED       X'10' IUCV INTERRUPT IS STACKED
002F   47 Bitstring    1 *              RESERVED
0030   48 Signed       4 *              Reserved for future use
0034   52 Signed       4 *              Reserved for future use
     THE CCTDESCT FIELD HAS BEEN ADDED TO KEEP TRACK OF THE NUMBER OF
     MESSAGE PENDING INTERRUPTS THAT NEED TO BE REFLECTED. THIS COUNT IS
     INCREMENTED WHEN A MESSAGE IS PLACED ON THE SEND QUEUE AND IS
     DECREMENTED WHEN EITHER THE INTERRUPT IS REFLECTED OR THE MESSAGE IS
     DESCRIBED.
0038   56 Signed       4 CCTDESCT       SEND QUEUE MSGS TO BE DESCRIBED
     ADD A RESERVED FIELD TO FORCE A DOUBLEWORD BOUNDARY FOR THE CCTPDSEG
     FIELD SO BLOCKDEF WILL WORK PROPERLY.
003C   60 Signed       4 *              RESERVED
     START OF PATH DESCRIPTION SEGMENT POINTERS (DWD ALIGNED)
0040   64 Dbl-Word     8 * (0)          ALIGNMENT
0040   64 Signed       4 CCTPDSEG (0)   N (1<=N<=256) PDSEG POINTERS
          00000043       CCTPDSLO       CCTPDSEG+3 BYTE FOR INVALID PDSEG
                                        TEST
          .... ...1      CCTSINV        X'01' PDSEG INVALID BIT
          00000008       CCTSIZE        (*-CCTBK+7)/8 CCTBK SIZE IN
                                        DOUBLEWORDS

CCTBK Storage Layout

*** CCTBK - Communications Control Table
*
*     +-------------+------+------+---------------------------+
*   0 |  CCTMXPID   |//////|:FLAG2|         CCTIUCV           |
*     +-------------+------+------+---------------------------+
*   8 |         CCTSNDHD          |         CCTSNDTL          |
*     +---------------------------+---------------------------+
*  10 |         CCTSNDPR          |         CCTRCVHD          |
*     +---------------------------+---------------------------+
*  18 |         CCTRCVTL          |         CCTRPYHD          |
*     +---------------------------+---------------------------+
*  20 |         CCTRPYTL          |         CCTRPYPR          |
*     +---------------------------+------+------+------+------+
*  28 |         CCTMSGCT          |//////|:CPSYS|:STAT |//////|
*     +---------------------------+------+------+------+------+
*  30 |///////////////////////////|///////////////////////////|
*     +---------------------------+---------------------------+
*  38 |         CCTDESCT          |///////////////////////////|
*     +---------------------------+---------------------------+
*  40 |                                                       |
*     =                       CCTPDSEG                        =
*     |                                                       |
*     +-------------------------------------------------------+
*
*** CCTBK - Communications Control Table