| 1 | /* Duplicate a file descriptor result, avoiding clobbering
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| 2 | STD{IN,OUT,ERR}_FILENO, with specific flags.
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| 3 |
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| 4 | Copyright (C) 2001, 2004-2006, 2009-2016 Free Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software: you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | /* Written by Paul Eggert and Eric Blake. */
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| 20 |
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| 21 | #include <config.h>
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| 22 |
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| 23 | /* Specification. */
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| 24 | #include "unistd-safer.h"
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| 25 |
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| 26 | #include <fcntl.h>
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| 27 | #include <unistd.h>
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| 28 |
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| 29 | /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
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| 30 | STDERR_FILENO. If FLAG contains O_CLOEXEC, behave like
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| 31 | fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD). */
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| 32 |
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| 33 | int
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| 34 | dup_safer_flag (int fd, int flag)
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| 35 | {
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| 36 | return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
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| 37 | STDERR_FILENO + 1);
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| 38 | }
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