Secrets of Inter-Language Communication in z/OS

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Secrets of Inter-Language Communication in z/OS - Course Objectives

On successful completion of this class, the student, with the aid of the appropriate reference materials, should be able to:

Code calling and called programs using one or more of these LE-conforming compilers:

    Enterprise COBOL

    XL C/C++ for z/OS

    Enterprise PL/I

    or Assembler language
Define elementary and aggregate data types in all of these languages
Access JCL PARM data from a main program written in any of these languages, and set the JCL return code value; access the parm data from a subroutine written in any of these languages using the CEE3PRM service
Describe the general content of object modules in OBJ, XOBJ, and GOFF formats
Call subroutines / external functions from each of these languages, statically and dynamically, passing elementary and aggregate data items, passing by reference indirect, by content indirect, and by content direct, and examining any returned value from the subroutine, as possible for each language
Code subroutines in each of these languages, receiving data as it is passed and passing back a return value as appropriate and possible, with an objective of creating subroutines that can be called from programs written in any of the four languages discussed here
Describe how argument lists are built and how parameter lists are received in all four languages
Use the program binder to create load modules and program objects
Create and use programs with multiple entry points
Deal with variable numbers of arguments and parameters, as appropriate to each language, and setting and recognizing omitted parameters where possible
Where possible, share external data items across programs, modules, and languages
Code DLLs in C, COBOL, PL/I, or Assembler and code programs in Assembler, COBOL, C, or PL/I that use DLLs
Use packages in PL/I programs.

Topical outline
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