[PATCH v2] getlogin.3: ATTRIBUTES: Note function that is not thread-safe

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The function getlogin() is not thread safe.
The function cuserid() is thread-safe with exceptions.

Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx>
---
 man3/getlogin.3 | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/man3/getlogin.3 b/man3/getlogin.3
index be7cc87..7050d5d 100644
--- a/man3/getlogin.3
+++ b/man3/getlogin.3
@@ -135,6 +135,20 @@ password database file
 \fI/var/run/utmp\fP
 (traditionally \fI/etc/utmp\fP;
 some libc versions used \fI/var/adm/utmp\fP)
+.SH ATTRIBUTES
+.SS Multithreading(see pthreads(7))
+The
+.BR getlogin ()
+function is not thread-safe.
+.LP
+The
+.BR getlogin_r ()
+function is thread-safe.
+.LP
+The
+.BR cuserid ()
+function is thread-safe with exceptions.
+It is not thread-safe if called with a NULL parameter.
 .SH CONFORMING TO
 .BR getlogin ()
 and
-- 
1.8.1.4

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