[PATCH] manual: Document setlogmask as MT-safe.

[Florian Weimer]

* Carlos O'Donell:

> On 2/13/25 4:04 PM, Florian Weimer wrote:
>> * Carlos O'Donell:
>> 
>>> setlogmask(3) was made MT-safe in glibc-2.33 with the fix for
>>> bug 26100.
>>> ---
>>>  manual/syslog.texi | 5 +----
>>>  1 file changed, 1 insertion(+), 4 deletions(-)
>>>
>>> diff --git a/manual/syslog.texi b/manual/syslog.texi
>>> index 02f84d6e6f..90a6487c02 100644
>>> --- a/manual/syslog.texi
>>> +++ b/manual/syslog.texi
>>> @@ -498,10 +498,7 @@ The symbols referred to in this section are declared in the file
>>>  
>>>  @deftypefun int setlogmask (int @var{mask})
>>>  @standards{BSD, syslog.h}
>>> -@safety{@prelim{}@mtunsafe{@mtasurace{:LogMask}}@asunsafe{}@acsafe{}}
>>> -@c Read and modify are not guarded by syslog_lock, so concurrent changes
>>> -@c or even uses are undefined.  This should use an atomic swap instead,
>>> -@c at least for modifications.
>>> +@safety{@prelim{}@mtsafe{}@asunsafe{}@acsafe{}}
>>>  
>>>  @code{setlogmask} sets a mask (the ``logmask'') that determines which
>>>  future @code{syslog} calls shall be ignored.  If a program has not
>> 
>> Looks good.
>> 
>> Reviewed-by: Florian Weimer <fweimer@redhat.com>
>
> And surprising this broke check-safety.sh test.
>
> I think it is a flaw in the test that it passes before but doesn't pass now.

I think it's deliberate that @asunsafe always requires an argument.