CCTBK Back to Index page
 
Prolog 
Control Block Contents 
   CCTBK 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.


  CCTBK Prolog Top of page
 
 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
 RELOCATION CONSIDERATIONS : This control block is relocated as part of a live
              guest relocation (LGR).  The bits and fields that
              need to be relocated are defined in the
              corresponding LGRCCTBK COPY file.  Whenever changes
              are made to this control block, consideration must
              be given to any effects these changes will have on
              a relocation.  If any new fields or bits are
              defined, they may need to be relocated.  If
              existing bits or fields are changed, corresponding
              modifications may be required in the LGR version of
              this control block.  Consider also the effects of
              these changes on a relocation involving a back-level
              release of CP.
 
 
  CCTBK Control Block Content Top of page
 

 CCTBK DSECT Top of page
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' CCTPNDSN IUCV NON-PRIORITY MSGS PENDING .1.. .... CCTPNDSP X'40' CCTPNDSP IUCV PRIORITY MESSAGES PENDING ..1. .... CCTPNDRN X'20' CCTPNDRN IUCV NON-PRIORITY REPLIES PENDING ...1 .... CCTPNDRP X'10' CCTPNDRP IUCV PRIORITY REPLIES PENDING .... 1... CCTPNDCT X'08' CCTPNDCT 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' CCTRTVBF RETRIEVE BUFFER IN PROGRESS .1.. .... CCTSYNC X'40' CCTSYNC ABLE TO PROCESS SYNC SENDS ..1. .... CCTCPINT X'20' CCTCPINT CP server interrupt in progress ...1 .... CCTSTKED X'10' CCTSTKED 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 .1.. ..11 CCTPDSLO CCTPDSEG+3 CCTPDSLO BYTE FOR INVALID PDSEG TEST .... ...1 CCTSINV X'01' CCTSINV PDSEG INVALID BIT 00000008 CCTSIZE (*-CCTBK+7)/8 CCTBK SIZE IN DOUBLEWORDS
 
 
  CCTBK Storage Layout Top of page
 
          
*** 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          |///////////////////////////|
*     +---------------------------+---------------------------+
*
*** CCTBK - Communications Control Table
 
 
  CCTBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
CCTCPINT       002E 20
CCTCPSYS       002D
CCTDESCT       0038
CCTFLAG2       0003
CCTIUCV        0004
CCTMSGCT       0028
CCTMXPID       0000
CCTPDSEG       0040
CCTPDSLO       0040 43
CCTPNDCT       0003 08
CCTPNDRN       0003 20
CCTPNDRP       0003 10
CCTPNDSN       0003 80
CCTPNDSP       0003 40
CCTRCVHD       0014
CCTRCVTL       0018
CCTRPYHD       001C
CCTRPYPR       0024
CCTRPYTL       0020
CCTRTVBF       002E 80
CCTSINV        0040 01
CCTSIZE        0040 00000008
CCTSNDHD       0008
CCTSNDPR       0010
CCTSNDTL       000C
CCTSSCCS       002D 07
CCTSTAT        002E
CCTSTKED       002E 10
CCTSYNC        002E 40
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:47:51 EDT.
Copyright IBM Corporation, 1990, 2022