1 /*-
2 * Copyright (c) 2012 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _RENAMEAT_H_
31 #define _RENAMEAT_H_
32
33 #include <stdio.h>
34 #include <unistd.h>
35
36 static int
renameat(int fromfd,const char * from,int tofd,const char * to)37 renameat(int fromfd, const char *from, int tofd, const char *to)
38 {
39 int cfd, error, ret;
40
41 if (fromfd != tofd) {
42 errno = EINVAL;
43 return (-1);
44 }
45
46 cfd = open(".", O_RDONLY | O_DIRECTORY);
47 if (cfd == -1)
48 return (-1);
49
50 if (fchdir(fromfd) == -1) {
51 error = errno;
52 (void)close(cfd);
53 errno = error;
54 return (-1);
55 }
56
57 ret = rename(from, to);
58
59 error = errno;
60 (void)fchdir(cfd);
61 (void)close(cfd);
62 errno = error;
63 return (ret);
64 }
65
66 #endif /* !_RENAMEAT_H_ */
67