1/* Invoke openat, but avoid some glitches.
2
3   Copyright (C) 2005-2006, 2008-2010 Free Software Foundation, Inc.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18/* Written by Paul Eggert for open, ported by Eric Blake for openat.  */
19
20#include <config.h>
21
22#include "fcntl-safer.h"
23
24#include <fcntl.h>
25#include <stdarg.h>
26#include "unistd-safer.h"
27
28int
29openat_safer (int fd, char const *file, int flags, ...)
30{
31  mode_t mode = 0;
32
33  if (flags & O_CREAT)
34    {
35      va_list ap;
36      va_start (ap, flags);
37
38      /* We have to use PROMOTED_MODE_T instead of mode_t, otherwise GCC 4
39         creates crashing code when 'mode_t' is smaller than 'int'.  */
40      mode = va_arg (ap, PROMOTED_MODE_T);
41
42      va_end (ap);
43    }
44
45  return fd_safer (openat (fd, file, flags, mode));
46}
47