linux-kernel - Re: [PATCH] alternative to sys

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Message-ID: <481096C3.2020206@redhat.com>
Date:	Thu, 24 Apr 2008 07:18:43 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH] alternative to sys_indirect, part 1

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Alan Cox wrote:
> Given we will never have 2^32 socket types, and in a sense this is part
> of the type why not just use
> 
> 	socket(PF_INET, SOCK_STREAM|SOCK_CLOEXEC, ...)
> 
> that would be far far cleaner, no new syscalls on the socket side at all.

You have a strange sense of "clean" I must say.

I don't think this is a viable approach because it is not about the
range.  People can and do select arbitrary values for those types.
Until a value is officially recognized and registered it is in fact best
to choose a (possibly large) random value to not conflict with anything
else.  Who can guarantee that whatever bit is chosen for SOCK_CLOEXEC
isn't already used by someone?

Add to this that it's not a complete solution (no such hack possible for
accept) and I think using a new interface is cleaner(tm).

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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