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 -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
