From: Eric Blake <eblake@redhat.com>
To: cygwin-apps@cygwin.com
Subject: Re: [SECURITY] libidn - locale specific error in test suite
Date: Thu, 19 Jan 2017 21:17:00 -0000 [thread overview]
Message-ID: <e2fee223-467d-c9dd-0eee-eb178bc62b16@redhat.com> (raw)
In-Reply-To: <20170119210219.GA3775@calimero.vinschen.de>
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On 01/19/2017 03:02 PM, Corinna Vinschen wrote:
>>>> After stepping through a debugger, it looks like this is a bug in gnulib
>>>> and not cygwin. Gnulib is trying to test that its own function
>>>> gl_locale_name() can track the use of uselocale() to set a thread-local
>>>> locale that overrides the global locale.
>> nl_langinfo_l(NL_LOCALE_NAME(LC_MESSAGES), locale);
>>
>> to recover the name of the LC_MESSAGES portion of the locale object.
>>
>> As Cygwin lacks that macro, there is NO way to access the locale name of
>> what went into constructing a thread-local locale without peeking into
>> the internal guts of the opaque locale_t object.
>
> Question: Why is that needed outside of testcases? If you called
> newlocale you know how it has been constructed. The info should be
> available. I have no problems to take glibc emulating stuff, but is
> there a real-world example?
Yes. Consider a library-writer that wants to do something in the correct
locale. Here, you have a logical separation from the main app that
calls newlocale()/uselocale() and the library code that now wants to
reconstruct what the current locale is. So being able to reconstruct
the names of the thread-local locale via gl_locale_name() makes the
library less coupled to the main app's setup. In particular, at least
gettext wants to use it.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2017-01-19 21:17 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-26 15:18 [SECURITY] libidn Yaakov Selkowitz
2016-09-30 6:44 ` Dr. Volker Zell
2016-12-29 20:49 ` Yaakov Selkowitz
2017-01-03 10:54 ` [SECURITY] libidn - locale specific error in test suite Dr. Volker Zell
2017-01-09 14:26 ` Corinna Vinschen
2017-01-18 12:13 ` Dr. Volker Zell
2017-01-18 15:24 ` Eric Blake
2017-01-19 10:39 ` Corinna Vinschen
2017-01-19 17:40 ` Eric Blake
2017-01-19 18:19 ` Corinna Vinschen
2017-01-19 20:17 ` Eric Blake
2017-01-19 21:02 ` Corinna Vinschen
2017-01-19 21:17 ` Eric Blake [this message]
2017-01-20 8:36 ` Corinna Vinschen
2017-01-19 20:34 ` Eric Blake
2017-01-19 20:43 ` Yaakov Selkowitz
2017-02-22 18:58 ` Yaakov Selkowitz
2017-03-10 22:01 ` Yaakov Selkowitz
2017-03-24 19:00 ` Yaakov Selkowitz
2017-05-03 21:38 ` Yaakov Selkowitz
2017-03-10 22:02 ` Yaakov Selkowitz
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