linux-kernel - Re: If not readdir() then what?

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Message-ID: <46194260.3050900@zytor.com>
Date:	Sun, 08 Apr 2007 12:28:32 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Theodore Tso <tytso@....edu>,
	Jörn Engel <joern@...ybastard.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Hellwig <hch@...radead.org>,
	Ulrich Drepper <drepper@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Neil Brown <neilb@...e.de>
Subject: Re: If not readdir() then what?

Theodore Tso wrote:
> It doesn't state explicitly that you can use the telldir cookie()
> after closing the directory stream using closedir() and then reopening
> it using opendir(), but given that it states that results are
> undefined after a rewinddir() --- which is much less violent than a
> closedir()/opendir(), I would definitely argue that an application
> programmer would be very ill-advised to rely on this working.
> 
> (Of course, I'd argue that an application programmer shouldn't use
> telldir/seekdir at all.....)
> 
> Ulrich, is it too late to insert a clarification that the telldir()
> cookie isn't guaranteed to be valid after closedir() *or* rewinddir()?

More fundamentally, the telldir cookie should never be valid when 
applied to a different DIR * (even one that refers to the same directory.)

	-hpa
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