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Date: Mon, 28 Jan 2019 19:42:36 +0000
From: Jorge Almeida <>
Subject: Re: fdopendir (BUG?)

On Mon, Jan 28, 2019 at 6:54 PM Adhemerval Zanella
<> wrote:
> On 28/01/2019 10:37, Jorge Almeida wrote:
> > (the problem also occurs with glibc, besides the fact that glibc
> > requires also _GNU_SOURCE to compile, contradicting  the linux man
> > page)
> Because O_PATH is a Linux extension and it guards such definitions
> with _GNU_SOURCE. And although man-pages is not the canonical glibc
> documentation, it does states that O_PATH is only defined if
> _GNU_SOURCE is also defined (man-pages commit
> 1135dbe188a48d7fa237396ab371ebf74037c1f6 from 2013-02-13).

My man page for opendir has the date  2017-09-15 ("release  4.16  of
the  Linux  man-pages  project") It says:
   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:

I have glibc-2.27

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