simple tcp socket programming

[Roger Oberholtzer]

On Tue, 24 Feb 2004 10:06:59 -0600
"Vu Pham" <vu at sivell.com> wrote:

> 
> ----- Original Message ----- 
> From: "Roger Oberholtzer" <roger at opq.se>
> To: <linux-users at linux-sxs.org>
> Sent: Tuesday, February 24, 2004 9:47 AM
> Subject: Re: simple tcp socket programming
> 
> 
> > On Tue, 24 Feb 2004 23:39:45 +0800
> > "M.W. Chang" <mwchang at i-cable.com> wrote:
> >
> > > >       server.sin_port = htons((short) port);
> > > >
> > > >       /* Set any socket/protocol options */
> > > >       int on = 1;
> > > >       setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &on,
> > > >       sizeof(on));
> > > >>     if (bind(sock, (struct sockaddr *)&server, sizeof server) < 0)
> > > >{
> > >
> > > Thank you. Worked like a charm.
> >
> > Great. BTW, the socket option for reusing the address may or may not be
> > needed. If the client and server will be on the same machine it will be
> > needed. So I usually just do it. However, if the two sides will always
> > be
> on
> > a different machine, it may not be needed.
> >
> 
> IMHO, SO_REUSEADDR allows the server to bind to that port ( listen ) again
> immediately right after it stops. Without this option, if you kill the
> server app, and run the server app again immediatete, it may not be able
> to bind to that same port and gives the error "bind() error: Address
> already in use".

That too. But is is really the same underlying thing. We always enable
reusing ports.

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