I see, in my C++ projects, EFPL, ENVB, EVALB and SHVB structs that appear to me 
to have been produced from IBM macros by the EDCDSECT tool.

Have you looked for the IRX macros in SYS1.MACLIB?

Are you familiar with EDCDSECT?

Slightly changing the subject, to interface with the Rexx environment from a 
called function you will need the entry R0, I found no great way to get that. I 
had to write a tiny front end in assembler that passes R0 to a C/C++ main().

Charles

On Wed, 15 Nov 2023 10:57:14 -0600, Eric Erickson <esf...@windstream.net> wrote:

>I've written quite a few callable external functions for Rexx over the years. 
>On z/OS I've always used assembler as we needed to access system services for 
>a variety of tasks. I've written them in C for other platforms (OS/2 & 
>Windows) over the years. I need to write some on z/OS, but I want to use C, 
>but can not seem to find any examples or header files for the Rexx Control 
>Blocks. I can't believe nobody has done this over the years? Is it even 
>supported? 

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