linux-kernel - Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced

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Message-ID: <87wr102j2y.fsf@blp.benpfaff.org>
Date:	Wed, 15 Aug 2012 09:52:53 -0700
From:	Ben Pfaff <blp@...stanford.edu>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, davem@...emloft.net,
	hpa@...or.com, thierry.reding@...onic-design.de,
	bfields@...hat.com, eric.dumazet@...il.com, xemul@...allels.com,
	neilb@...e.de, netdev@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, paul.gortmaker@...driver.com,
	viro@...iv.linux.org.uk, gorcunov@...nvz.org,
	akpm@...ux-foundation.org, tim.c.chen@...ux.intel.com,
	devel@...nvz.org, ebiederm@...ssion.com
Subject: Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced

Stanislav Kinsbursky <skinsbursky@...allels.com> writes:

> This system call is especially required for UNIX sockets, which has name
> lenght limitation.

The worst of the name length limitations can be worked around by
opening the directory where the socket is to go as a file
descriptor, then using /proc/self/fd/<fd>/<basename> as the name
of the socket.  This technique also works with "connect" and in
other contexts where a struct sockaddr is needed.  At first
glance, it looks like your patches only help with "bind".
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