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1 /* Duplicate a file descriptor result, avoiding clobbering
2    STD{IN,OUT,ERR}_FILENO, with specific flags.
3 
4    Copyright (C) 2001, 2004-2006, 2009-2012 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 
33 int
dup_safer_flag(int fd,int flag)34 dup_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