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-rw-r--r--lib/dup-safer.c46
1 files changed, 0 insertions, 46 deletions
diff --git a/lib/dup-safer.c b/lib/dup-safer.c
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1/* Invoke dup, but avoid some glitches.
2 Copyright (C) 2001, 2004, 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
17
18/* Written by Paul Eggert. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "unistd-safer.h"
25
26#include <fcntl.h>
27
28#include <unistd.h>
29#ifndef STDERR_FILENO
30# define STDERR_FILENO 2
31#endif
32
33/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
34 STDERR_FILENO. */
35
36int
37dup_safer (int fd)
38{
39#ifdef F_DUPFD
40 return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
41#else
42 /* fd_safer calls us back, but eventually the recursion unwinds and
43 does the right thing. */
44 return fd_safer (dup (fd));
45#endif
46}