• Subject: Re: Terminating a C Program
  • From: "Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>
  • Date: Tue, 08 Aug 00 23:09:26 +1000

Hello Mike,

You wrote:
>I have a few problems in understanding the program model that is used for C
>programs, and how the C program acts in the stack when called from RPG. 
>In essence I want the C program to behave like an RPG program - ie it stays
>resident until *INLR is set on. Is there a way of doing this in C?
>Alternatively, how do I control the invocation and termination of a C
>program ? My current C program is terminating each time it returns, and I
>need it and it's lower level RPG invocations to stay resident until I'm
>ready to end them.. 

C doesn't have that concept.  The closest you can come is by declaring static 
and using a named activation group.  I haven't tried it but since named 
groups persist until explicitly destroyed and static variables maintain state 
invocations the nett result should be the same.  Exactly what are you trying to 

>I'm also  bit confused as to which program model I have when I compile my C

C programs since VRM230 are ILE programs.  Prior to that they were EPM or 

>In my travels through Jennifer Hamilton's book, I saw a reference to
>STREPMENV and ENDEPMENV and I thought this might be the answer to the above

These commands refer to the EPM environment which was a stepping stone on the 
way to 
ILE.  It added multiple entry points, binding, and long names to the system but 
since it 
was imposed over the standard program model it also had a major performance 
impact -- 
most noticable when starting the environment or invoking the first EPM program.

>Unfortunately, it turns out I have ILE C program created using the CRTBNDC.
>When I look at the DSPPGM output, I find that this is an ILE program. When I
>use CRTCMOD/CRTPGM, of course it's an ILE program. I shouldn't have to
>create an EPM program should I? 

You don't have any choice.  EPM programs can no longer be created although I 
think they 
will still run (certainly on Version 3, and possibly on Version 4).  Query 
was written in Modula-2 which was an EPM compiler and I don't think it has been 
converted so that would suggest the runtime support is still present.

>I've have looked at the C Programmers Guide, but to no avail. 

The C manuals relate to the current ILE dialect.  There used to be an appendix 
discussing migrating from EPM C to ILE C but it may have been removed.

>Any help out there?
Well, that really rather depends doesn't it?  :)

Simon Coulter.

 FlyByNight Software         AS/400 Technical Specialists       
 Eclipse the competition - run your business on an IBM AS/400.  
 Phone: +61 3 9419 0175      Mobile: +61 0411 091 400           
 Fax:   +61 3 9419 0175      mailto: shc@flybynight.com.au      
 Windoze should not be open at Warp speed.                      

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