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 _FACCESSAT_H_ 31 #define _FACCESSAT_H_ 32 33 #include <unistd.h> 34 35 #define AT_EACCESS 0x01 36 37 static int 38 faccessat(int fd, const char *path, int mode, int flag) 39 { 40 int cfd, error, ret; 41 42 if (flag == AT_EACCESS) { 43 errno = EINVAL; 44 return (-1); 45 } 46 47 cfd = open(".", O_RDONLY | O_DIRECTORY); 48 if (cfd == -1) 49 return (-1); 50 51 if (fchdir(fd) == -1) { 52 error = errno; 53 (void)close(cfd); 54 errno = error; 55 return (-1); 56 } 57 58 ret = access(path, mode); 59 60 error = errno; 61 (void)fchdir(cfd); 62 (void)close(cfd); 63 errno = error; 64 return (ret); 65 } 66 67 #endif /* !_FACCESSAT_H_ */ 68