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

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Message-ID: <502C0D7C.2040707@zytor.com>
Date:	Wed, 15 Aug 2012 13:58:36 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
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
Subject: Re: [RFC PATCH 0/5] net: socket bind to file descriptor introduced

On 08/15/2012 12:49 PM, Eric W. Biederman wrote:
> 
> There is also the trick of getting a shorter directory name using
> /proc/self/fd if you are threaded and can't change the directory.
> 
> The obvious choices at this point are
> - Teach bind and connect and af_unix sockets to take longer AF_UNIX
>   socket path names.
> 
> - introduce sockaddr_fd that can be applied to AF_UNIX sockets,
>   and teach unix_bind and unix_connect how to deal with a second type of sockaddr.
>   struct sockaddr_fd { short fd_family; short pad; int fd; };
> 
> - introduce sockaddr_unix_at that takes a directory file descriptor
>   as well as a unix path, and teach unix_bind and unix_connect to deal with a
>   second sockaddr type.
>   struct sockaddr_unix_at { short family; short pad; int dfd; char path[102]; }
>   AF_UNIX_AT
> 
> I don't know what the implications of for breaking connect up into 3
> system calls and changing the semantics are and I would really rather
> not have to think about it.
> 
> But it certainly does not look to me like you introduce new systems
> calls to do what you want.
> 

How would you distinguish the new sockaddr types from the traditional
one?  New AF_?

	-hpa
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