The sample API-crossing exit program, CSQCAPX

 

The sample exit program is supplied as an assembler-language program. The source file (CSQCAPX) is supplied in the library thlqual.SCSQASMS (where thlqual is the high-level qualifier used by your installation). This source file includes pseudocode that describes the program logic.

The sample program contains initialization code and a layout that we can use when writing your own exit programs.

The sample shows how to:

• Set up the exit parameter block

• Address the call and exit parameter blocks

• Determine for which MQI call the exit is being invoked

• Determine whether the exit is being invoked before or after processing of the MQI call

• Put a message on a CICS temporary storage queue

• Use the macro DFHEIENT for dynamic storage acquisition to maintain reentrancy

• Use DFHEIBLK for the CICS exec interface control block

• Trap error conditions

• Return control to the caller

• Design of the sample exit program
  

 

Parent topic:

The API-crossing exit for z/OS

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