linux-kernel - Re: Error binding socket: address already in use

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Date:	Wed, 13 Sep 2006 16:46:37 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Peter Lezoch <pledr@...nline.de>
cc:	linux-kernel@...r.kernel.org
Subject: Re: Error binding socket: address already in use


>Hi,
>killing a server task that is operating on a UDP socket( AF_INET, 
>SOCK_DGRAM, IPPROTO_UDP ), leaves the socket in an unclosed state. A 
>subsequently started task, that wants to use the same port, gets from 
>bind above error message.This is, in my opinion, wrong behavior, 

man setsockopt
Look for SO_REUSEADDR
It is all correct behavior.

>because of the connectionless nature of UDP. Only reboot solves this 

Waiting a while should also solve this.

>situation. It looks, as if in net/socket.c, TCP and UDP are handled in 
>the same way without taking into account the different nature of the 
>protocols?!
>How can I overcome this problem ?

Jan Engelhardt
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