stdio-common/tmpnam_r.c

   1 /* Copyright (C) 1991-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19
  20 /* Generate a unique filename in P_tmpdir.  If S is NULL return NULL.
  21    This makes this function thread safe.  */
  22 char *
  23 tmpnam_r (char *s)
  24 {
  25   if (s == NULL)
  26     return NULL;
  27
  28   if (__path_search (s, L_tmpnam, NULL, NULL, 0))
  29     return NULL;
  30   if (__gen_tempname (s, 0, 0, __GT_NOCREATE))
  31     return NULL;
  32
  33   return s;
  34 }
  35
  36 link_warning (tmpnam_r,
  37               "the use of `tmpnam_r' is dangerous, better use `mkstemp'")