mirror of https://github.com/acidanthera/audk.git
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/** @file
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Open a directory.
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Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Copyright (c) 1983, 1993
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The Regents of the University of California. All rights reserved.
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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. 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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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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NetBSD: opendir.c,v 1.33 2008/01/10 09:49:04 elad Exp
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opendir.c 8.7 (Berkeley) 12/10/94
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**/
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#include <sys/cdefs.h>
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#include <namespace.h>
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#include <reentrant.h>
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#include <extern.h>
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#include <sys/param.h>
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//#include <sys/mount.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define MAXITERATIONS 100
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/*
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* Open a directory.
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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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_DIAGASSERT(name != NULL);
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return (__opendir2(name, DTF_HIDEW|DTF_NODUP));
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}
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DIR *
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__opendir2(const char *name, int flags)
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{
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DIR *dirp = NULL;
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int fd;
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int serrno;
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struct stat sb;
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int incr;
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_DIAGASSERT(name != NULL);
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if ((fd = open(name, O_RDONLY | O_NONBLOCK, 0)) == -1 ||
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fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
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goto error;
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if (fstat(fd, &sb) || !S_ISDIR(sb.st_mode)) {
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errno = ENOTDIR;
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goto error;
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}
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if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL)
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goto error;
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dirp->dd_buf = NULL;
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/*
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* If the machine's page size is an exact multiple of DIRBLKSIZ,
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* use a buffer that is 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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incr = DIRBLKSIZ;
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dirp->dd_len = incr;
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dirp->dd_buf = malloc((size_t)dirp->dd_len);
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if (dirp->dd_buf == NULL)
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goto error;
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dirp->dd_seek = 0;
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flags &= ~DTF_REWIND;
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dirp->dd_loc = 0;
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dirp->dd_fd = fd;
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dirp->dd_flags = flags;
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/*
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* Set up seek point for rewinddir.
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*/
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#ifdef _REENTRANT
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if (__isthreaded) {
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if ((dirp->dd_lock = malloc(sizeof(mutex_t))) == NULL)
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goto error;
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mutex_init((mutex_t *)dirp->dd_lock, NULL);
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}
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#endif
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dirp->dd_internal = NULL;
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return (dirp);
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error:
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serrno = errno;
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if (dirp && dirp->dd_buf)
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free(dirp->dd_buf);
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if (dirp)
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free(dirp);
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if (fd != -1)
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(void)close(fd);
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errno = serrno;
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return NULL;
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}
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