linux-kernel - Re: [PATCH] open: introduce O

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Date:	Fri, 28 Aug 2009 06:58:25 -0600
From:	Eric Blake <ebb9@....net>
To:	Florian Weimer <fweimer@....de>
CC:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bug-coreutils@....org, bug-gnulib@....org,
	Ulrich Drepper <drepper@...hat.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] open: introduce O_NOSTD

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According to Florian Weimer on 8/28/2009 6:52 AM:
>> If the caller requested O_CLOEXEC, then your version takes 3, 5, or
>> 7 syscalls depending on how many std fds were closed, while my
>> version takes 3 syscalls regardless of how many std fds were closed.
> 
> I really don't see a way around that.  You can't pick a descriptor and
> hope that it's unused.

fcntl(,F_DUPFD,3) is NOT like dup2.  It picks the next available
descriptor that is at least 3.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@....net
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