IRC - Interregion control blocks

      CONTROL BLOCK NAME = DFHIRSPS
      DESCRIPTIVE NAME = CICS TS Interregion Control Blocks
           Licensed Materials - Property of IBM
            Restricted Materials of IBM 
           5655-Y04
           (C) Copyright IBM Corp. 1980, 2005 
      FUNCTION =
           Descriptions of all inter-region communication control
           blocks which are visible to the subsystem level of
           inter-region communication.
                 The control blocks defined are:
           SLCB Subsystem Logon Control Block
           SCCB Subsystem Connection Control Block
           SCACB(E) Subsystem Connection Address Control Block
      NOTES :
       DEPENDENCIES = S/370
       RESTRICTIONS = N/A
       MODULE TYPE = Control block definition
                 Subsystem Logon Control Block
           This DSECT describes the format of the SLCB which is the
           control block that contains the information relevant to
           the logon session which is of interest to the sybsystem
           level of inter-region communication.
           First define the format of the fields in the SLCB.

         FLAGS IN STATUS BYTE 1: LCBSTTS1 OR SLCBSTS1

         FLAGS IN STATUS BYTE 2: LCBSTTS2 OR SLCBSTS2

         FLAGS IN STATUS BYTE 4: LCBSTTS4 OR SLCBSTS2

                 Subsystem Connection Control Block
           This DSECT defines the SCCB, the control block which
           contains the information about a particular connection
           which can be accessed by the subsystem level of inter-
           region communication function.
           First define the format of the fields in the SCCB.

         FLAGS IN STATUS BYTE 2:

                 Subsystem Connection Address Control Block
           These DSECTs define the format of the SCACB and its
           entries. The SCACB is used by the subsystem level
           of interregion communication function to obtain the
           addresses of the SCCBs representing its connections.

                     Logon Connections List
           This list is passed to logon by the requester, and
           it describes the systems to which this logger-on
           can be connected.

           The SVC argument list comprises a list of addresses,
           each of which is the address of a function argument list.

           The function argument list, addressed from the SVC
           argument list, contains different arguments according to
           the function being requested. The first six arguments
           identify the function required, the function modifier
           (for SWITCH, DISCONNECT or QUIESCE), the user number
           and identification, and the thread number and
           identification (where required). The remaining three
           arguments depend on the function requested and identify
           a system name (for LOGON, INSERV or QUIESCE), a
           subsystem control block address (for LOGON or CONNECT)
           and a parameter list (for LOGON or SWITCH).

         The following equates define the function request
         codes for the Interregion Communication Program.
         There are two levels of function request defined here:
         The SVC function code addressed from the SVC argument list
         and the function type qualification code addressed from
         the function argument list for particular functions.

               SVC FUNCTION CODES

               FUNCTION QUALIFICATION CODES

                     Error Return Codes
         The following equates define the return codes passed
         back by the interregion communication SVC when it
         detects an error. These error codes are loaded into R15.

         Qualifiers for Getmain and size exceeded errors

         Error return codes continued

    Qualifiers for security check failure

    Error codes continued

    Qualifiers for logon/add connection list error

    Error codes continued