linux-kernel - Re: [patch 7/8] fdmap v2

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Message-Id: <20070607124505.2d829b9b.dada1@cosmosbay.com>
Date:	Thu, 7 Jun 2007 12:45:05 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2

On Thu, 7 Jun 2007 11:06:23 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> > I don't think it's a matter of versioning. Many userspace libraries 
> > expects their fds to be compact (for many reasons - they use select, they 
> > use them to index 0-based arrays, etc...), and if the kernel suddendly 
> > starts returning values in the 1<<28 up arena, they sure won't be happy.
> > So I believe that the correct way is that the caller specifically selects 
> > the feature, leaving the legacy fd allocation as default.
> 
> I don't understand the connection between this paragraph (with which I
> agree) and the urge to add a ton of ugly syscall hacks. "Caller
> specifically selects feature" - > prctl(). Libraries get unhappy ->
> linker issue.
> 

Alan, prctl() things are usually inherited at fork()/exec() time.

If you fork() from a new application , then exec an old one 
(eventually a statically linked program), we have a problem ?
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