linux-kernel - Re: [PATCH] nextfd(2)

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Message-ID: <4F7F1864.8090606@zytor.com>
Date:	Fri, 06 Apr 2012 09:23:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
	torvalds@...ux-foundation.org, drepper@...il.com,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] nextfd(2)

On 04/06/2012 02:54 AM, Alexey Dobriyan wrote:
> 
> Without proc knowledge about fdtable is gathered linearly and still unreliable.
> With nextfd(2), even procful environments could lose several failure branches.
> And they can keep old dumb fd++ or smart /proc/self/fd loops for a change.
> 

Incidentally, if we were to create a system call for this -- which I so
far see no reason for -- I would make it return a select-style bitmask
of file descriptors in use, not a "next fd" which would require a system
call per iteration.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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