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

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Date:	Wed, 15 Aug 2012 10:54:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	blp@...stanford.edu
CC:	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	tglx@...utronix.de, mingo@...hat.com, davem@...emloft.net,
	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

On 08/15/2012 09:52 AM, Ben Pfaff wrote:
> 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".
> 

The really hard part is what to do with things that are supposed to
return a struct sockaddr.  I also have some reservations about using a
new system call to deal with what at least theoretically is only part of
one socket domain.

	-hpa

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