Commit | Line | Data |
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c0c3707f CB |
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 | } |