| 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 | } |