From owner-freebsd-hackers@FreeBSD.ORG  Sun Apr  8 20:07:35 2012
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From: Ivan Voras <ivoras@freebsd.org>
Date: Sun, 8 Apr 2012 22:06:53 +0200
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Subject: Re: Socket buffer usage
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On 8 April 2012 15:41,  <rozhuk.im@gmail.com> wrote:
> ioctl(FIONREAD)

Yes, this is what I was looking for, thanks!