1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *               Glenn Fowler <glenn.s.fowler@gmail.com>                *
18 *                    David Korn <dgkorn@gmail.com>                     *
19 *                     Phong Vo <phongvo@gmail.com>                     *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 #include <ast.h>
25 
26 #if _lib_dup2
27 
28 NoN(dup2)
29 
30 #else
31 
32 #include <error.h>
33 
34 int
35 dup2(int d1, int d2)
36 {
37 	int	save_errno;
38 
39 	if (d1 == d2) return(d1);
40 	save_errno = errno;
41 	close(d2);
42 	errno = save_errno;
43 	return(fcntl(d1, F_DUPFD, d2));
44 }
45 
46 #endif
47