104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
#ifndef HAVE_OPENDIR
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)opendir.c 5.11 (Berkeley) 2/23/91";
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#endif /* LIBC_SCCS and not lint */
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/lock.h>
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static DIR *
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_opendir_common(int fd)
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{
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DIR *dirp;
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if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
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close (fd);
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return NULL;
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}
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/*
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* If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
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* buffer that it cluster boundary aligned.
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* Hopefully this can be a big win someday by allowing page trades
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* to user space to be done by getdirentries()
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*/
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dirp->dd_buf = malloc (512);
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dirp->dd_len = 512;
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if (dirp->dd_buf == NULL) {
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free (dirp);
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close (fd);
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return NULL;
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}
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dirp->dd_fd = fd;
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dirp->dd_loc = 0;
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dirp->dd_seek = 0;
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/*
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* Set up seek point for rewinddir.
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*/
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#ifdef HAVE_DD_LOCK
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/* if we have a locking mechanism, initialize it */
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__lock_init_recursive(dirp->dd_lock);
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#endif
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return dirp;
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}
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DIR *
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opendir(const char *name)
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{
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int fd;
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if ((fd = open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) == -1)
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return (NULL);
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return (_opendir_common(fd));
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}
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DIR *
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fdopendir(int fd)
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{
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if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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return (NULL);
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return (_opendir_common(fd));
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}
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#endif /* ! HAVE_OPENDIR */
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