[PATCH] getpwnam.3: Add description of the functions are not thread-safe

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The functions getpwnam() and getpwuid() return a pointer to a static area which
is overwritten by a subsequent call to them. So they are thread-unsafe.

Signed-off-by: Peng Haitao <penght@xxxxxxxxxxxxxx>
---
 man3/getpwnam.3 |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/man3/getpwnam.3 b/man3/getpwnam.3
index 649da01..679477d 100644
--- a/man3/getpwnam.3
+++ b/man3/getpwnam.3
@@ -32,7 +32,7 @@
 .\" Modified 2003-11-15 by aeb
 .\" 2008-11-07, mtk, Added an example program for getpwnam_r().
 .\"
-.TH GETPWNAM 3  2010-10-21 "GNU" "Linux Programmer's Manual"
+.TH GETPWNAM 3  2011-09-15 "GNU" "Linux Programmer's Manual"
 .SH NAME
 getpwnam, getpwnam_r, getpwuid, getpwuid_r \- get password file entry
 .SH SYNOPSIS
@@ -206,6 +206,19 @@ Insufficient buffer space supplied.
 .TP
 .I /etc/passwd
 local password database file
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The two functions
+.BR getpwnam ()
+and
+.BR getpwuid ()
+are not thread_safe.
+.LP
+The two functions
+.BR getpwnam_r ()
+and
+.BR getpwuid_r ()
+are thread-safe.
 .SH "CONFORMING TO"
 SVr4, 4.3BSD, POSIX.1-2001.
 The
-- 
1.7.1

-- 
Best Regards,
Peng Haitao

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