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