/*- * 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_ */ |