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/** @file
Open a directory.
Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Copyright (c) 1983, 1993
The Regents of the University of California. All rights reserved.
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.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
NetBSD: opendir.c,v 1.33 2008/01/10 09:49:04 elad Exp
opendir.c 8.7 (Berkeley) 12/10/94
**/
#include <sys/cdefs.h>
#include <namespace.h>
#include <reentrant.h>
#include <extern.h>
#include <sys/param.h>
//#include <sys/mount.h>
#include <sys/stat.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAXITERATIONS 100
/*
* Open a directory.
*/
DIR *
opendir(const char *name)
{
_DIAGASSERT(name != NULL);
return (__opendir2(name, DTF_HIDEW|DTF_NODUP));
}
DIR *
__opendir2(const char *name, int flags)
{
DIR *dirp = NULL;
int fd;
int serrno;
struct stat sb;
int incr;
_DIAGASSERT(name != NULL);
if ((fd = open(name, O_RDONLY | O_NONBLOCK, 0)) == -1 ||
fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
goto error;
if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
goto error;
}
if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL)
goto error;
dirp->dd_buf = NULL;
/*
* If the machine's page size is an exact multiple of DIRBLKSIZ,
* use a buffer that is cluster boundary aligned.
* Hopefully this can be a big win someday by allowing page trades
* to user space to be done by getdirentries()
*/
incr = DIRBLKSIZ;
dirp->dd_len = incr;
dirp->dd_buf = malloc((size_t)dirp->dd_len);
if (dirp->dd_buf == NULL)
goto error;
dirp->dd_seek = 0;
flags &= ~DTF_REWIND;
dirp->dd_loc = 0;
dirp->dd_fd = fd;
dirp->dd_flags = flags;
/*
* Set up seek point for rewinddir.
*/
#ifdef _REENTRANT
if (__isthreaded) {
if ((dirp->dd_lock = malloc(sizeof(mutex_t))) == NULL)
goto error;
mutex_init((mutex_t *)dirp->dd_lock, NULL);
}
#endif
dirp->dd_internal = NULL;
return (dirp);
error:
serrno = errno;
if (dirp && dirp->dd_buf)
free(dirp->dd_buf);
if (dirp)
free(dirp);
if (fd != -1)
(void)close(fd);
errno = serrno;
return NULL;
}
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