1 /* Invoke open, but return either a desired file descriptor or -1.
3 Copyright (C) 2005, 2006 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. */
23 #include "fd-reopen.h"
29 /* Open a file to a particular file descriptor. This is like standard
30 `open', except it always returns DESIRED_FD if successful. */
33 fd_reopen (int desired_fd, char const *file, int flags, mode_t mode)
38 fd = open (file, flags, mode);
39 if (fd == desired_fd || fd < 0)
43 int fd2 = fcntl (fd, F_DUPFD, desired_fd);
44 int saved_errno = errno;