| /*- |
| * Copyright (c) 2012 The FreeBSD Foundation |
| * All rights reserved. |
| * |
| * This software was developed by Pawel Jakub Dawidek under sponsorship from |
| * the FreeBSD Foundation. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #ifndef _OPENAT_H_ |
| #define _OPENAT_H_ |
| |
| #include <fcntl.h> |
| #include <stdarg.h> |
| #include <unistd.h> |
| |
| static int |
| openat(int fd, const char *path, int flags, ...) |
| { |
| int cfd, ffd, error; |
| |
| cfd = open(".", O_RDONLY | O_DIRECTORY); |
| if (cfd == -1) |
| return (-1); |
| |
| if (fchdir(fd) == -1) { |
| error = errno; |
| (void)close(cfd); |
| errno = error; |
| return (-1); |
| } |
| |
| if ((flags & O_CREAT) != 0) { |
| va_list ap; |
| int mode; |
| |
| va_start(ap, flags); |
| mode = va_arg(ap, int); |
| va_end(ap); |
| |
| ffd = open(path, flags, mode); |
| } else { |
| ffd = open(path, flags); |
| } |
| |
| error = errno; |
| (void)fchdir(cfd); |
| (void)close(cfd); |
| errno = error; |
| return (ffd); |
| } |
| |
| #endif /* !_OPENAT_H_ */ |
| |
