1 | /* Duplicate a file descriptor result, avoiding clobbering |
2 | STD{IN,OUT,ERR}_FILENO, with specific flags. |
3 | |
4 | Copyright (C) 2001, 2004-2006, 2009-2019 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 <https://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 |
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 | |