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e5fb99b712
syscall. Before r5958, seekdir() was called for its side effect of freeing memory allocated by opendir() for rewinddir(), but that revision added _reclaim_telldir() that frees all memory allocated by telldir() calls, making this call redundant. This introduces a slight change. If an application duplicated the descriptor obtained through dirfd(), it can no longer rely on file position to be reset to the start of file after a call to closedir(). It's believed to be safe because neither POSIX, nor any other OS I've tested (NetBSD, Linux, OS X) rewind the file offset pointer on closedir(). Reported by: Igor Sysoev
69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* Copyright (c) 1983, 1993
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* Regents of the University of California. 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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* 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[] = "@(#)closedir.c 8.1 (Berkeley) 6/10/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/types.h>
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#include <dirent.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "telldir.h"
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/*
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* close a directory.
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*/
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int
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closedir(DIR *dirp)
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{
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int fd;
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if (__isthreaded)
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_pthread_mutex_lock(&dirp->dd_lock);
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fd = dirp->dd_fd;
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dirp->dd_fd = -1;
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dirp->dd_loc = 0;
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free((void *)dirp->dd_buf);
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_reclaim_telldir(dirp);
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if (__isthreaded) {
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_pthread_mutex_unlock(&dirp->dd_lock);
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_pthread_mutex_destroy(&dirp->dd_lock);
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}
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free((void *)dirp);
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return(_close(fd));
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}
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