topic Re: Openvms UDP programming using sys$qio in Operating System - OpenVMS

Openvms UDP programming using sys$qio

Max Bruno Jarvis — Fri, 07 Aug 2009 15:18:02 GMT

I'm new to network programming on OpenVMS. I need to write a simple application to allow two adjacent OpenVMS computers to exchange datagrams via Ethernet. Datagrams can go both ways and I need to use ASTs for read completions, so can't use the sockets API. I'm finding the HP manual very confusing, for example I'm not really clear whether I need a 'socket' or not. Does anybody have any sample source code (in C, using sys$qio) for sending UDP datagrams between two OpenVMS systems? Sounds easy but I'm not finding it so.

Re: Openvms UDP programming using sys$qio

Walter Miller_1 — Fri, 07 Aug 2009 15:29:09 GMT

If you are using HP's tcpip stack you can usually find example programs in sys$common:syshelp.examples.ucx] or sys$common:syshelp.examples.tcpip] depending version of tcpip you are using and if whoever installed the product chose to include the example files.

Re: Openvms UDP programming using sys$qio

Max Bruno Jarvis — Fri, 07 Aug 2009 15:39:47 GMT

I can't find a directory named syshelp on the disk at all. These are Integrity servers which came with OpenVMS and TCPIP already installed.

Re: Openvms UDP programming using sys$qio

Duncan Morris — Fri, 07 Aug 2009 15:49:23 GMT

Minor correction to Walter's posting:

Directory SYS$COMMON:[SYSHLP.EXAMPLES.TCPIP]

so SYSHLP not SYSHELP.

Duncan

Re: Openvms UDP programming using sys$qio

Max Bruno Jarvis — Fri, 07 Aug 2009 16:02:46 GMT

Aha, now I've found SYSHLP files, my thanks to both responders. Will study the files forthwith.

Re: Openvms UDP programming using sys$qio

Richard J Maher — Sat, 08 Aug 2009 01:14:24 GMT

Hi Max,

The examples are easiest found using the old UCX$EXAMPLES or new TCPIP$EXAMPLES logical names.

In case it is of any interest to what you are doing with UDP, there is a Java Applet on the following page that receives messages from a VMS server asynchronously and outputs to a web page: -
http://deathrow.vistech.net/~tier3/tier3pager.html

Once youve got it up you need to logon the the deathrow.vistech.net and: -
$run DISK$USERS:[USERS.TIER3.WEB]demo_udp_msg

Then enter the IP address of your client.

Regards Richard Maher

Re: Openvms UDP programming using sys$qio

Ananth S — Mon, 10 Aug 2009 03:32:22 GMT

dir tcpip$examples:*udp*qio*.*
These are the example programs.