1 /* Invoke open, but avoid some glitches.
2 Copyright (C) 2005 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Paul Eggert. */
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
24 #include "fcntl-safer.h"
26 #include <fcntl.h>
27 #include <stdarg.h>
28 #include "unistd-safer.h"
30 int
31 open_safer (char const *file, int flags, ...)
32 {
33 mode_t mode = 0;
35 if (flags & O_CREAT)
36 {
37 va_list ap;
38 va_start (ap, flags);
40 /* Assume mode_t promotes to int if and only if it is smaller.
41 This assumption isn't guaranteed by the C standard, but we
42 don't know of any real-world counterexamples. */
43 mode = (sizeof (mode_t) < sizeof (int)
44 ? va_arg (ap, int)
45 : va_arg (ap, mode_t));
47 va_end (ap);
48 }
50 return fd_safer (open (file, flags, mode));
51 }