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<H1>[MUD-Dev] Re: Quick socket question</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: Quick socket question</LI>
<LI><em>From</em>: Ben Greear <<A HREF="mailto:greear#cyberhighway,net">greear#cyberhighway,net</A>></LI>
<LI><em>Date</em>: Sat, 7 Nov 1998 15:36:57 -0700 (MST)</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
I run on Slackware, 3.3 right now, which is older than redhat 5.0.
If I do a proper shutdown (with the close(socket_descriptor) call),
then I can re-bind to it in a matter of seconds.
Make sure you are checking the return values for all such system
calls.
Also, I log-out every connected descriptor before I try to close
the main listening socket. That might have something to do with
it.
Ben
On Sat, 7 Nov 1998, Dr. Cat wrote:
> Well, we were going to install Solaris 86 on the Furcadia server machine
> to replace the buggy older version of BSDI it had on it. But the
> sysadmin out there suggested going to Red Hat Linux instead, because it's
> a BDS family rather than a SYSV family, and there might be fewer
> problems. I agreed. I don't know how hard getting it going on SYSV
> would have been, but I know my O'Reilly "Using C on the Unix system" is
> so old that it says Berkeley Unixes have sockets and SYSV don't! Surely
> SYSV has to have sockets now, what with this "internet" thing having
> gotten so popular since this book was written - don't they?
>
> Anyway, I got a couple compatibility problems involving select() and
> accept() worked out, but I've noticed the return of a problem we
> sometimes had under Linux with the old DragonSpires server, which is the
> ancestor of the Furcadia server code. After the game is shut down or the
> server code crashes, and it tries to restart, it fails to bind the port
> for the next 15-20 minutes. This is an improvement over the Linux of 4
> years ago, which apparently didn't have a timeout for this case and would
> leave the game unaccessible for hours, days, or potentially forever until
> I could successfully beg the uncooperative sysadmin of that system for a
> reboot! Still, I'd like to fix this problem if I can.
>
> I thought at first it was because I wasn't closing the socket when the
> accept() problem I was having crashed it. But I did a proper operator
> shutdown, which takes the bound socket and does shutdown(mastsock, 2)
> and close(mastsock) before existing. Do I need to do anything more on
> closing to make sure the port is freed up, even if there's some
> recalcitrant user's machine out there still desperately trying to talk to
> it? Or is there a setsockopt option I need to set differently? Or is
> there a sysadmin tweak to change that timeout value? If anyone's dealt
> with this issue under Linux before (or any other Unix that has the same
> issue) I'd appreciate a pointer. :X)
>
> *-------------------------------------------**-----------------------------*
> Dr. Cat / Dragon's Eye Productions || Free alpha test:
> *-------------------------------------------** <A HREF="http://www.bga.com/furcadia">http://www.bga.com/furcadia</A>
> Furcadia - a new graphic mud for PCs! || Let your imagination soar!
> *-------------------------------------------**-----------------------------*
>
> P.S. I've been to busy to reply to anything on the list, but Raph, I
> really liked the Laws page you set up, and I sent the URL to all of our
> volunteer staff and to some friends to browse through. Though I would
> have worded that stamp collector thing a lot differently. I'm still
> waiting for that lunch if you want to talk about how to revise that or
> anything. :X)
>
> --
> MUD-Dev: Advancing an unrealised future.
>
Ben Greear (greear#cyberhighway,net) <A HREF="http://www.primenet.com/~greear">http://www.primenet.com/~greear</A>
Author of ScryMUD: mud.primenet.com 4444
<A HREF="http://www.primenet.com/~greear/ScryMUD/scry.html">http://www.primenet.com/~greear/ScryMUD/scry.html</A>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><strong><A NAME="00796" HREF="msg00796.html">[MUD-Dev] Re: ScryMUD [CUSTOM] Released under GNU General Public License</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 08 Nov 1998, 06:25 GMT
<LI><strong><A NAME="00795" HREF="msg00795.html">[MUD-Dev] ScryMUD [CUSTOM] Released under GNU General Public License</A></strong>,
Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Sun 08 Nov 1998, 05:55 GMT
<LI><strong><A NAME="00792" HREF="msg00792.html">[MUD-Dev] Re: Quick socket question</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sun 08 Nov 1998, 02:52 GMT
<LI><strong><A NAME="00788" HREF="msg00788.html">[MUD-Dev] Quick socket question</A></strong>,
Dr. Cat <a href="mailto:cat#bga,com">cat#bga,com</a>, Sat 07 Nov 1998, 21:27 GMT
<UL>
<LI><strong><A NAME="00789" HREF="msg00789.html">[MUD-Dev] Re: Quick socket question</A></strong>,
Ben Greear <a href="mailto:greear#cyberhighway,net">greear#cyberhighway,net</a>, Sat 07 Nov 1998, 22:45 GMT
</LI>
<LI><strong><A NAME="00790" HREF="msg00790.html">[MUD-Dev] Re: Quick socket question</A></strong>,
Jon Leonard <a href="mailto:jleonard#divcom,slimy.com">jleonard#divcom,slimy.com</a>, Sat 07 Nov 1998, 22:48 GMT
<UL>
<LI><strong><A NAME="00791" HREF="msg00791.html">[MUD-Dev] Re: Quick socket question</A></strong>,
Petri Virkkula <a href="mailto:pvirkkul#iki,fi">pvirkkul#iki,fi</a>, Sat 07 Nov 1998, 23:24 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00793" HREF="msg00793.html">[MUD-Dev] Re: Quick socket question</A></strong>,
J C Lawrence <a href="mailto:claw#kanga,nu">claw#kanga,nu</a>, Sun 08 Nov 1998, 04:02 GMT
<UL>
<LI><strong><A NAME="00803" HREF="msg00803.html">[MUD-Dev] Re: Quick socket question</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 10 Nov 1998, 02:01 GMT
</LI>
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