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annotate lib/dup-safer.c @ 9309:bbbbbf4cd1c5

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Change copyright notice from GPLv2+ to GPLv3+.
author Bruno Haible <bruno@clisp.org>
date Sun, 07 Oct 2007 19:14:58 +0200
parents cb2590895141
children 8398d9f607b4
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1 /* Invoke dup, but avoid some glitches.
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3 Copyright (C) 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 #include <config.h>
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21
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22 #include "unistd-safer.h"
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23
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24 #include <fcntl.h>
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25
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26 #include <unistd.h>
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27 #ifndef STDERR_FILENO
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28 # define STDERR_FILENO 2
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29 #endif
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30
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31 /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
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32 STDERR_FILENO. */
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33
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34 int
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35 dup_safer (int fd)
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36 {
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37 #if defined F_DUPFD && !defined FCHDIR_REPLACEMENT
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38 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
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39 #else
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40 /* fd_safer calls us back, but eventually the recursion unwinds and
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41 does the right thing. */
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42 return fd_safer (dup (fd));
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43 #endif
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44 }