Re: TCP/IP Sockets from RPG

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

In that tutorial, 'errno' isn't a variable -- it's a subprocedure.  You 
can't EVAL it in debug, because it's not a variable.

The obvious solution is to assign the output of errno to a variable and 
display THAT. OR follow the advice in the tutorial and call strerror() 
to get an error message.

Please keep in mind (as I've said several times on this list already) 
that rdline() was only intended as a teaching aid, it's not intended to 
be code that you download and use in production.  I don't use it in 
production, and it has only received minimal testing.  I also know (for 
a fact) that it doesn't perform very well.

I do have a much nicer service program for TCP programming in RPG, with 
a lot of better tools.  It has a replacement for rdline() that runs very 
fast, and does true CCSID translation.  It has lots of other tools for 
commonly used TCP functions...   but the code for this service program 
is very complex -- not the sort of thing you'd put into a tutorial, 
because the code isn't easy to digest.


Christopher Anderson wrote:
>  
> Good morning everyone,
>
> I've been attempting to create a socket connection to a report vendor
> using Scott Klement's (hi Scott) tutorial on that subject.  I've managed
> to successfully establish the socket connection AND send the request
> records downstream but the segment of the program that accepts the
> response doesn't work as I anticipated which leads me to believe I'm not
> getting the concept very well. 
>
> What I need to do is accept a number of records into the buffer until I
> get an END TRANSMISSION record.  Each record will be the same length and
> is identified internally.  So, I'll grab one record, decide what type it
> is and process it then read the next record from the buffer.  I'm also
> supposed to put a 60 second time out on this segment of code but we'll
> blow up that bridge later.
>
> The logic is:
>
> DOU LastRecord = *On;
> 	rc = rdline(sock: %addr(recbuf): %size(recbuf): *On);
> 	if rc < 0;
> 		 err = errno;
>              callp close(sock);
>              callp die('rdline(): ' + %str(strerror(err)));
>              return;
> 	endif;
>
> 	TestRecord = recbuf; // This moves what's in the buffer into a
> DS that can locate the 
> 			         // record type field.
> 	// Process record.
>
> ENDDO;
>
> What happens is the system works for a while on the rc=rdline... Line
> then returns -1 for rc and the errno variable comes back with an error
> when I attempt to eval it in debug.  (A type error).  
>
> Does anyone have any idea what I'm doing wrong or what I'm missing?  
>
> Thank you,
> Chris Anderson
> Partners Mutual Insurance