setsockopt Problem

Following Scott Klement's excellent sockets tutorial, I have created a program 
that will send and receive data to and from a business partner.  Since the 
"recv" sockets command waits indefinitely for data, I tried to use the 
"setsockopt" command with level -1 (socket) and option name 50 (recv timeout) 
to change the wait time to one second.  

I found out through the archives that this is not supported, but strangely 
enough, it worked on the first day.  However, it stopped working the next day.  

So I guess I have two questions.  First, does anyone know why it would work one 
day and not the next?  Second, if I can't change the timeout value, how do I 
prevent "recv" from waiting forever for data?

We have V5R3 and are pretty current on p.t.f.s.

Thank you for your assistance.

Donald R. Fisher, III
Project Manager
RoomStore, Inc.
(804) 784-7600 ext. 2124
dfisher@xxxxxxxxxxxxx