1 /* Duplicate an open file descriptor to a specified file descriptor.
3 Copyright (C) 1999, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19 /* written by Paul Eggert */
31 dupfd (int fd, int desired_fd)
33 int duplicated_fd = dup (fd);
34 if (duplicated_fd < 0 || duplicated_fd == desired_fd)
38 int r = dupfd (fd, desired_fd);
40 close (duplicated_fd);
48 dup2 (int fd, int desired_fd)
54 return fcntl (fd, F_DUPFD, desired_fd);
56 return dupfd (fd, desired_fd);