[ILUG] socket programming

[nick_elliott at ie.ibm.com]

Hi guys,

I have a question relating to socket programming - something with which I
don't have a lot of confidence. I have written a socket program which
resides on a linux server. This program listens on port 5560 for
information coming from any one of 72 PC's. The program has a queue enabled
for up to 10 clients. However, every now and again, the socket program
hangs in mid-transfer. I don't know the reason for this - maybe someone
could advise. The transfer involves an ascii file.

However, I am trying to write another program at the moment that runs on
the server. The purpose of this program is to send a status request to the
server program. If it doesn't get a response within a certain amount of
time, then it kills and restarts the server program. The socket programs
are written in C. I have a script written which kills and restarts the
server program and the status program runs this. However, i cannot get the
status program to connect to a socket on the server. I am trying to connect
to the machine using port 5561. The server program uses 5560.

That probably isn't explained very well but does anyone have any ideas why
the status program ( running on the server ) wouldn't be able to connect to
a port on itself.

Mise Le Meas/Kind Regards/Mit Freundlichen Gruessen

Nick Elliott,
Disk Test Engineering,
Storage Systems Division,
IBM International Holdings
E-mail: Nick_Elliott at ie.ibm.com
Tel: +353-1-8153031