1/* Duplicate a file descriptor result, avoiding clobbering
2   STD{IN,OUT,ERR}_FILENO, with specific flags.
3
4   Copyright (C) 2001, 2004-2006, 2009-2014 Free Software Foundation, Inc.
5
6   This program is free software: you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 3 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18
19/* Written by Paul Eggert and Eric Blake.  */
20
21#include <config.h>
22
23/* Specification.  */
24#include "unistd-safer.h"
25
26#include <fcntl.h>
27#include <unistd.h>
28
29/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
30   STDERR_FILENO.  If FLAG contains O_CLOEXEC, behave like
31   fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD).  */
32
33int
34dup_safer_flag (int fd, int flag)
35{
36  return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
37                STDERR_FILENO + 1);
38}
39