On 25/4/23 20:48, Rick Troth wrote:
good questions
The library that I want to call is "just C", pretty clean, standard
POSIX. My development platform is PC Linux. The package gets built and
tested on other platforms as often as I can drive that, notably FreeBSD.
I don't have access to USS for dev/test. (But if anyone is offering ...)
There's no specific need to interrogate nor to set Rexx variables. The
goal is a function which takes arguments and returns a string. The
Rexx function has sub-functions named by the first argument. It works
a lot like Rexx/Sockets (return string is the RC followed by either an
error string or by desired results, if any).
Interfacing with Regina is pretty easy. Regina's header in this case
is named "rexxsaa.h", so presumably adheres to SAA norms. I confess I
have NOT TRIED linking against ooRexx. Thought I should first ask
others who have tread that road.
I suggest that you consider porting Regina to z/OS, which is highly
portable and easy to do. I have personally done it and even have a patch
file somewhere. Currently, it's compiled in ASCII mode, but it can also
support EBCDIC with some modifications to the lex lexer and YACC parser.
Keep in mind that z/OS REXX programming services are mainly designed for
HLASM and not HLL's. The best way to achieve good performance is by
creating a subcommand processor using CEEPIPI to set up a
pre-initialized LE environment and writing simple HLASM glue code.
Although I've done this before, it requires a lot of work and is quite
tedious just to use REXX https://github.com/daveyc/RTK.
Thanks!
-- R; <><
On 4/25/23 08:37, Jeremy Nicoll wrote:
On Tue, 25 Apr 2023, at 13:29, Rick Troth wrote:
hello
I have a project where I want to call C from Rexx.
I've done this with Regina several times. Can someone tell me how, or
point to doco, or (best) lend a hand, calling C from ooRexx?
Do you have ooREXX running on a mainframe?
Which OS?
If z/OS ... Is the C program in LINKLIST? or a load lib? What
calling (register) convention is it written with - like a TSO CP,
or a job-step program, or what?
Are you expecting the C code to access contents of rexx
variables "by magic" or are you going to pass copies of
their values, or their addresses in storage, or what?
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