46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* Invoke dup, but avoid some glitches.
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Copyright (C) 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "unistd-safer.h"
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#include <fcntl.h>
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#include <unistd.h>
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#ifndef STDERR_FILENO
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# define STDERR_FILENO 2
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#endif
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/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
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STDERR_FILENO. */
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int
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dup_safer (int fd)
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{
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#if defined F_DUPFD && !defined FCHDIR_REPLACEMENT
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return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
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#else
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/* fd_safer calls us back, but eventually the recursion unwinds and
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does the right thing. */
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return fd_safer (dup (fd));
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#endif
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}
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