1*09d4459fSDaniel Fojt /* Duplicate a file descriptor result, avoiding clobbering
2*09d4459fSDaniel Fojt STD{IN,OUT,ERR}_FILENO, with specific flags.
3*09d4459fSDaniel Fojt
4*09d4459fSDaniel Fojt Copyright (C) 2001, 2004-2006, 2009-2020 Free Software Foundation, Inc.
5*09d4459fSDaniel Fojt
6*09d4459fSDaniel Fojt This program is free software: you can redistribute it and/or modify
7*09d4459fSDaniel Fojt it under the terms of the GNU General Public License as published by
8*09d4459fSDaniel Fojt the Free Software Foundation; either version 3 of the License, or
9*09d4459fSDaniel Fojt (at your option) any later version.
10*09d4459fSDaniel Fojt
11*09d4459fSDaniel Fojt This program is distributed in the hope that it will be useful,
12*09d4459fSDaniel Fojt but WITHOUT ANY WARRANTY; without even the implied warranty of
13*09d4459fSDaniel Fojt MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*09d4459fSDaniel Fojt GNU General Public License for more details.
15*09d4459fSDaniel Fojt
16*09d4459fSDaniel Fojt You should have received a copy of the GNU General Public License
17*09d4459fSDaniel Fojt along with this program. If not, see <https://www.gnu.org/licenses/>. */
18*09d4459fSDaniel Fojt
19*09d4459fSDaniel Fojt /* Written by Paul Eggert and Eric Blake. */
20*09d4459fSDaniel Fojt
21*09d4459fSDaniel Fojt #include <config.h>
22*09d4459fSDaniel Fojt
23*09d4459fSDaniel Fojt /* Specification. */
24*09d4459fSDaniel Fojt #include "unistd-safer.h"
25*09d4459fSDaniel Fojt
26*09d4459fSDaniel Fojt #include <fcntl.h>
27*09d4459fSDaniel Fojt #include <unistd.h>
28*09d4459fSDaniel Fojt
29*09d4459fSDaniel Fojt /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
30*09d4459fSDaniel Fojt STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
31*09d4459fSDaniel Fojt fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */
32*09d4459fSDaniel Fojt
33*09d4459fSDaniel Fojt int
dup_safer_flag(int fd,int flag)34*09d4459fSDaniel Fojt dup_safer_flag (int fd, int flag)
35*09d4459fSDaniel Fojt {
36*09d4459fSDaniel Fojt return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
37*09d4459fSDaniel Fojt STDERR_FILENO + 1);
38*09d4459fSDaniel Fojt }
39