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Message-ID: <4B7CE47E.4090500@freebsd.org>
Date: Wed, 17 Feb 2010 22:55:58 -0800
From: Tim Kientzle <kientzle@freebsd.org>
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To: Garrett Cooper <yanefbsd@gmail.com>
References: <201002170911.o1H9BL6m095996@svn.freebsd.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org, Poul-Henning Kamp <phk@freebsd.org>
Subject: Re: svn commit: r203990 - head/lib/libc/sys
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Garrett Cooper wrote:
> On Wed, Feb 17, 2010 at 1:11 AM, Poul-Henning Kamp <phk@freebsd.org> wrote:
>> Author: phk
>> Date: Wed Feb 17 09:11:21 2010
>> New Revision: 203990
>> URL: http://svn.freebsd.org/changeset/base/203990
>>
>> Log:
>>  Mention EISDIR as a possible errno.
>>
>> Modified:
>>  head/lib/libc/sys/unlink.2
> 
>     This is wrong as per POSIX
> (<http://www.opengroup.org/onlinepubs/000095399/functions/unlink.html>):
> 
> [EPERM]
> The file named by path is a directory, and either the calling process
> does not have appropriate privileges, or the implementation prohibits
> using unlink() on directories.

On a not-entirely-unrelated note, I wonder if
any of the POSIX experts around know whether POSIX
specifies an errno value for this call:
   open("/", O_WRONLY | O_EXCL | O_CREAT, 0777)

I ran into this puzzler back when I was trying to optimize
the restore sequence for libarchive.  As near as I've
been able to tell, POSIX is ambiguous here:  It
requires EISDIR for open(O_WRONLY) on a dir and EEXIST
for open(O_EXCL | O_CREAT) on an existing item but
without any clear guidance on which of those takes
priority in this case.

Anyone think they know the answer?

Cheers,

Tim