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Message-ID: <3cd586df-a7fa-8660-c17e-d32aa845431c@linaro.org>
Date: Mon, 28 Jan 2019 18:30:57 -0200
From: Adhemerval Zanella <adhemerval.zanella@...aro.org>
To: musl@...ts.openwall.com
Subject: Re: fdopendir (BUG?)
On 28/01/2019 17:42, Jorge Almeida wrote:
> On Mon, Jan 28, 2019 at 6:54 PM Adhemerval Zanella
> <adhemerval.zanella@...aro.org> 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)):
>
> fdopendir():
> Since glibc 2.10:
> _POSIX_C_SOURCE >= 200809L
> Before glibc 2.10:
> _GNU_SOURCE
>
> I have glibc-2.27
>
This is for *fdopendir* declaration, the *O_PATH* flag is documented by
open.2 and it defines:
---
CONFORMING TO
open(), creat() SVr4, 4.3BSD, POSIX.1-2001, POSIX.1-2008.
openat(): POSIX.1-2008.
The O_DIRECT, O_NOATIME, O_PATH, and O_TMPFILE flags are Linux-specific.
One must define _GNU_SOURCE to obtain their definitions.
---
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