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glibc  2.9
tmpnam_r.c
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00001 /* Copyright (C) 1991,1993,1996-1999,2000,2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdio.h>
00020 
00021 /* Generate a unique filename in P_tmpdir.  If S is NULL return NULL.
00022    This makes this function thread safe.  */
00023 char *
00024 tmpnam_r (char *s)
00025 {
00026   if (s == NULL)
00027     return NULL;
00028 
00029   if (__path_search (s, L_tmpnam, NULL, NULL, 0))
00030     return NULL;
00031   if (__gen_tempname (s, 0, __GT_NOCREATE))
00032     return NULL;
00033 
00034   return s;
00035 }
00036 
00037 link_warning (tmpnam_r,
00038              "the use of `tmpnam_r' is dangerous, better use `mkstemp'")