1 /* Duplicate an open file descriptor to a specified file descriptor.
2 Copyright (C) 1999, 2004 Free Software Foundation, Inc.
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)
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.
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. */
18 /* written by Paul Eggert */
34 dupfd (int fd, int desired_fd)
36 int duplicated_fd = dup (fd);
37 if (duplicated_fd < 0 || duplicated_fd == desired_fd)
41 int r = dupfd (fd, desired_fd);
43 close (duplicated_fd);
51 dup2 (int fd, int desired_fd)
57 return fcntl (fd, F_DUPFD, desired_fd);
59 return dupfd (fd, desired_fd);