Re: TCP/IP Sockets from RPG

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