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 * $P4: //depot/projects/trustedbsd/openbsm/bin/auditdistd/openat.h#1 $ 30 */ 31 32 #ifndef _OPENAT_H_ 33 #define _OPENAT_H_ 34 35 #include <fcntl.h> 36 #include <stdarg.h> 37 #include <unistd.h> 38 39 static int 40 openat(int fd, const char *path, int flags, ...) 41 { 42 int cfd, ffd, error; 43 44 cfd = open(".", O_RDONLY | O_DIRECTORY); 45 if (cfd == -1) 46 return (-1); 47 48 if (fchdir(fd) == -1) { 49 error = errno; 50 (void)close(cfd); 51 errno = error; 52 return (-1); 53 } 54 55 if ((flags & O_CREAT) != 0) { 56 va_list ap; 57 int mode; 58 59 va_start(ap, flags); 60 mode = va_arg(ap, int); 61 va_end(ap); 62 63 ffd = open(path, flags, mode); 64 } else { 65 ffd = open(path, flags); 66 } 67 68 error = errno; 69 (void)fchdir(cfd); 70 (void)close(cfd); 71 errno = error; 72 return (ffd); 73 } 74 75 #endif /* !_OPENAT_H_ */ 76