Date: Thu, 5 Feb 1998 10:36:03 -0500
Reply-To: CICS List <CICS-L@UGA.CC.UGA.EDU>
Sender: CICS List <CICS-L@UGA.CC.UGA.EDU>
From: Phil-Reaston <PReaston@OFFICEDEPOT.COM>
Subject: Re: TCP/IP Development in CICS 4.1
> We are thinking about developing a TCP/IP interface (possible in a
> separate region) for our clients. We have a few questions about the
> interaction between CICS and TCP/IP. Our installation has the
> following CICS 4.1, Datacom 8.1, TCP/IP 3.1, VTAM 4.3, Cobol II 1.4:
We have a similar setup, but don't use Datacom
> 1) Has anyone done any similar development?
> * How did it go?
> * What kind of problems did you encounter?
> * How long did it take?
> * How many clients are using it?
> * Any suggestions?
* It's not live yet, but is going well.
* Most problems were with name resolution (GETHOSTBYNAME needs specific
C++ libs). I also had problems with blocking calls (specifically READ
blocks forever until it gets the number of bytes specified unless you
prevent it (using SELECT and IOCTL)).
* not long (weeks rather than months)
* currently one, eventually approx 25. I also have a CICS MVS client to
a WIN NT server which will have approx 150 connections
* Learn about sockets programming in general. Write PC based "tester"
programs to test your CICS pieces. Don't rely too heavily on the IBM
TCP/IP CICS Sockets Interface Guide - some of the COBOL examples are
misleading and some are just plain wrong. Make sure you enable DNS for
use by MVS.
> 2) Did you develop your own listener or use the IBM supplied one?
Used IBM supplied one
> 3) How were the socket handled?
Don't understand the question
> 4) Any Special considerations for CICS?
> * How's the performance?
> * Any problems?
* OK - I'll be surer on this when I go live.
> 5) Any comment on TCP/IP 3.2?
> 6) We're looking for a consultant, got any names?
> 7) Any other problems (VTAM, Datacom, etc..)?
Office Depot, Delray Beach, FL