624b98e244
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@242 42af7a65-404d-4744-a932-0658087f49c3
116 lines
4.0 KiB
C
116 lines
4.0 KiB
C
/****************************************************************************
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* fs_close.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sched.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "fs_internal.h"
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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int close(int fd)
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{
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FAR struct filelist *list;
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/* Get the thread-specific file list */
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list = sched_getfiles();
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if (!list)
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{
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*get_errno_ptr() = EMFILE;
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return ERROR;
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}
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if ((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS)
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{
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FAR struct inode *inode = list->fl_files[fd].f_inode;
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if (inode)
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{
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int ret = OK;
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/* Close the driver or mountpoint. NOTES: (1) there is no
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* exclusion mechanism here , the driver or mountpoint must be
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* able to handle concurrent operations internally, (2) The driver
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* may have been opened numerous times (for different file
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* descriptors) and must also handle being closed numerous times.
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* (3) for the case of the mountpoint, we depend on the close
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* methods bing identical in signature and position in the operations
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* vtable.
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*/
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if (inode->u.i_ops && inode->u.i_ops->close)
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{
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/* Perform the close operation (by the driver) */
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int status = inode->u.i_ops->close(&list->fl_files[fd]);
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if (status < 0)
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{
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/* An error occurred while closing the driver */
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*get_errno_ptr() = -status;
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ret = ERROR;
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}
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}
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/* Release the file descriptor */
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files_release(fd);
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/* Decrement the reference count on the inode. This may remove the inode and
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* eliminate the name from the namespace
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*/
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inode_release(inode);
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return ret;
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}
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}
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*get_errno_ptr() = EBADF;
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return ERROR;
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}
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#endif /* CONFIG_NFILE_DESCRIPTORS */
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