linux-kernel - Re: F_DUPFD_CLOEXEC implementation

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Message-ID: <Pine.LNX.4.64.0709281113390.22521@alien.or.mcafeemobile.com>
Date:	Fri, 28 Sep 2007 11:19:04 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ulrich Drepper <drepper@...hat.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: F_DUPFD_CLOEXEC implementation

On Fri, 28 Sep 2007, Ulrich Drepper wrote:

> One more small change to extend the availability of creation of
> file descriptors with FD_CLOEXEC set.  Adding a new command to
> fcntl() requires no new system call and the overall impact on
> code size if minimal.
> 
> If this patch gets accepted we will also add this change to the
> next revision of the POSIX spec.
> 
> To test the patch, use the following little program.  Adjust the
> value of F_DUPFD_CLOEXEC appropriately.

I think new system calls would have been a cleaner way to accomplish this. 
The "small pill at a time" may have better chance to go in, but will 
likely result in an uglier userspace interface.
In any case, this is better than *nothing*, if it makes it easier to use 
fds inside system libraries.



- Davide


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