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Date: Fri, 11 Jan 2008 19:15:05 +0000
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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To: SnaiX <nayuhz@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: the socket can't bind?
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SnaiX wrote:
> So it would run 1-4. but it reports EADDRINUSE after bind.
>
> Why?

The stack assumes that SO_REUSEADDR is never cleared on a socket after 
it gets set.

>  How to resolve it? Should I dup() the fd?
>   
Did you close the affected socket in (5) ?

Presumably you are still trying to use the same port; is it a 
non-ephemeral port? You might want to consider SO_REUSEPORT although I 
believe FreeBSD doesn't fully support it for non-multicast.

BMS