From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: A call to revise sockets behaviour
Date: Mon, 29 Jul 2013 10:42:58 -0700
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Cc: stephen@networkplumber.org, linux-kernel@vger.kernel.org,
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To: "Artem S. Tashkinov" <t.artem@lycos.com>
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On Mon, 2013-07-29 at 15:47 +0000, Artem S. Tashkinov wrote:

> A wine developer clearly showed that this option simply doesn't work. 
> 
> http://bugs.winehq.org/show_bug.cgi?id=26031#c21
> 
> Output of strace:
> getsockopt(24, SOL_SOCKET, SO_REUSEADDR, [0], [4]) = 0
> setsockopt(24, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
> bind(24, {sa_family=AF_INET, sin_port=htons(43012), sin_addr=inet_addr("0.     
> 0.0.0")}, 16) = -1 EADDRINUSE (Address already in use)

Its clear that some other socket did not use SO_REUSADDR

All sockets using a given port _must_ have use SO_REUSADDR to allow this
port being reused.