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 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