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Date: Fri, 17 Jul 2009 11:52:34 +0200
From: Jilles Tjoelker <jilles@stack.nl>
To: Tim Kientzle <kientzle@freebsd.org>
Message-ID: <20090717095234.GA48647@stack.nl>
References: <200907081523.n68FNIpi055036@svn.freebsd.org>
	<20090709173046.GA48155@stack.nl> <4A5CAC1B.4070006@freebsd.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r195458 - in head: include lib/libc/sys sys/bsm
	sys/compat/freebsd32 sys/compat/svr4 sys/i386/ibcs2 sys/kern sys/sys
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On Tue, Jul 14, 2009 at 09:02:35AM -0700, Tim Kientzle wrote:
> Another data point:  I've started looking at the *at()
> functions for libarchive's deep directory handling.  The
> current code uses chdir() to manipulate files with very long
> pathnames, but that causes complications for libarchive
> clients that I'd like to eliminate.  Using *at() functions
> to manage a "virtual current directory" looks a lot more robust.

> Unfortunately, there are still a few operations that are
> unavailable with this paradigm:
>   * ACL functions
>   * extattr functions

Right. As with pathconf(), "at" variants with AT_SYMLINK_NOFOLLOW option
would be useful here.

>   * link()
>   * symlink()

linkat() and symlinkat() exist.

In addition to providing the "at" functionality, linkat() allows
creating hard links to symlinks.

-- 
Jilles Tjoelker