1/* Invoke dup, but avoid some glitches.
2
3 Copyright (C) 2001, 2004-2006, 2009-2019 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 <https://www.gnu.org/licenses/>. */
17
18/* Written by Paul Eggert. */
19
20#include <config.h>
21
22#include "unistd-safer.h"
23
24#include <fcntl.h>
25#include <unistd.h>
26
27/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
28 STDERR_FILENO. */
29
30int
31dup_safer (int fd)
32{
33 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
34}
35