Re: TCP/IP Sockets

["Bob Crothers" <bob@xxxxxxxxxxxxxx>]

David,

Close, but not quite.  the read() will return a -1 to indicate an
error.  At that point, the errno variable (defined in C header file
errno.h).  Retrieving this value is very easy in ILE/C.  I don't know
how to get it with RPG.  But I could create a tiny service pgm to
retrieve it if you would like and nobody comes up with a better way.

Also note that it depends on how the socket on the other end is closed.
If a close() is issued, then you will get the -1.  But, if the other
side ends without actually closing the socket (eg: ctl-alt-del on
windows), you might not get any indication of a problem.  The
SO_KEEPALIVE socket option is SUPPOSED to handle this situation, but I
have never gotten it to work on the AS/400 (at least not up to V3R7).

Bob

-----Original Message-----
From: David Gibbs <David.Gibbs@IL.US.MKS.com>
To: 'Midrange Mailing List' <MIDRANGE-L@midrange.com>
Date: Friday, June 11, 1999 4:10 PM
Subject: RE: TCP/IP Sockets


>Folks:
>
>I'm not 100% sure on this... but I think that, when the remote site of
a
>TCP/IP connection disconnects abnormally, a read() (on the other side)
will
>return zero.
>
>david
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