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Re: [Qemu-devel] [PATCH 0/4] 9p: get rid of readdir_r()

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 0/4] 9p: get rid of readdir_r()
Date: Thu, 2 Jun 2016 10:33:06 +0100

On 2 June 2016 at 09:51, Greg Kurz <address@hidden> wrote:
> The readdir_r() function has a broken design and should not be used anymore.
> It is expected to be obsoleted in a future version of POSIX.1:
> http://austingroupbugs.net/view.php?id=696#c2857
> Glibc has already announced that 2.24 (scheduled for August 2016) will
> deprecates readdir_r() and encourages people to use readdir() with
> external synchronization instead.

> Since POSIX.1 will require readdir() to be thread-safe when employed on
> different directory streams, and glibc already does that, the choice
> was made to have per-directory locking.

AIUI the argument is that all sensible implementations of readdir()
already provide the thread-safety guarantees POSIX is going to
specify, but have you tested this on one of the BSDs or OSX?
(and/or checked their current readdir implementation...)

-- PMM

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