60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/* Invoke dup, but avoid some glitches.
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Copyright (C) 2001, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by Paul Eggert. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <errno.h>
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#if HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifndef STDERR_FILENO
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# define STDERR_FILENO 2
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#endif
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#include <unistd-safer.h>
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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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#ifdef F_DUPFD
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return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
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#else
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int f = dup (fd);
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if (0 <= f && f <= STDERR_FILENO)
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{
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int f1 = dup_safer (f);
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int e = errno;
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close (f);
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errno = e;
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f = f1;
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}
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return f;
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#endif
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}
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