Re: manpages-dev: please note thread safeness of %m in vfprintf(3)

[Ma Shimiao <mashimiao.fnst-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>]

Hello Stéphane，

On 03/07/2015 06:38 PM, Stéphane Aulery wrote:
> Hello Ma Shimiao,
> 
> A Debian user has applied to mention that strerror_r(3) is thread safe.
> 
> I quote his message [1]:
> 
>> Frome Martin Godisch <martin-AOktpf5JBruELgA04lAiVw@public.gmane.org>, Wed, 6 Apr 2011 09:30:30 +0200
>>
>> Please add a note to vfprintf(3) telling users that the %m conversion
>> specifier is thread safe.

I'm not sure why he need a note to indicate that the %m conversion specifier 
is thread safe.
From our research and glibc's document, vfprintf(3) is thread safe except when users pass float formatting,
custom formatting or single quota may cause locale dependency problem.
And I'm going to add thread safety information of vfprintf() into printf.3.
If there is something special about %m, we'd like to know.
And I'm willing to add it.

Best regards,
>>
>> Rationale: errno(3) is thread local, strerror_r(3) is thread safe, and
>> vfprintf(3) uses errno and strerror_r (in
>> eglibc-2.11.2/stdio-common/vfprintf.c:974).
> 
> This is your area, it may interest you.
> 
> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621057
> 
> Regards,
> 


-- 
Ma Shimiao
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)
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